diff options
Diffstat (limited to 'drivers/usb/host/fotg210-hcd.c')
| -rw-r--r-- | drivers/usb/host/fotg210-hcd.c | 6049 |
1 files changed, 0 insertions, 6049 deletions
diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c deleted file mode 100644 index fce13bcc4a3e..000000000000 --- a/drivers/usb/host/fotg210-hcd.c +++ /dev/null @@ -1,6049 +0,0 @@ -/* - * Faraday FOTG210 EHCI-like driver - * - * Copyright (c) 2013 Faraday Technology Corporation - * - * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com> - * Feng-Hsin Chiang <john453@faraday-tech.com> - * Po-Yu Chuang <ratbert.chuang@gmail.com> - * - * Most of code borrowed from the Linux-3.7 EHCI driver - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY - * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software Foundation, - * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ -#include <linux/module.h> -#include <linux/device.h> -#include <linux/dmapool.h> -#include <linux/kernel.h> -#include <linux/delay.h> -#include <linux/ioport.h> -#include <linux/sched.h> -#include <linux/vmalloc.h> -#include <linux/errno.h> -#include <linux/init.h> -#include <linux/hrtimer.h> -#include <linux/list.h> -#include <linux/interrupt.h> -#include <linux/usb.h> -#include <linux/usb/hcd.h> -#include <linux/moduleparam.h> -#include <linux/dma-mapping.h> -#include <linux/debugfs.h> -#include <linux/slab.h> -#include <linux/uaccess.h> -#include <linux/platform_device.h> -#include <linux/io.h> - -#include <asm/byteorder.h> -#include <asm/irq.h> -#include <asm/unaligned.h> - -/*-------------------------------------------------------------------------*/ -#define DRIVER_AUTHOR "Yuan-Hsin Chen" -#define DRIVER_DESC "FOTG210 Host Controller (EHCI) Driver" - -static const char hcd_name[] = "fotg210_hcd"; - -#undef VERBOSE_DEBUG -#undef FOTG210_URB_TRACE - -#ifdef DEBUG -#define FOTG210_STATS -#endif - -/* magic numbers that can affect system performance */ -#define FOTG210_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */ -#define FOTG210_TUNE_RL_HS 4 /* nak throttle; see 4.9 */ -#define FOTG210_TUNE_RL_TT 0 -#define FOTG210_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */ -#define FOTG210_TUNE_MULT_TT 1 -/* - * Some drivers think it's safe to schedule isochronous transfers more than - * 256 ms into the future (partly as a result of an old bug in the scheduling - * code). In an attempt to avoid trouble, we will use a minimum scheduling - * length of 512 frames instead of 256. - */ -#define FOTG210_TUNE_FLS 1 /* (medium) 512-frame schedule */ - -/* Initial IRQ latency: faster than hw default */ -static int log2_irq_thresh; /* 0 to 6 */ -module_param(log2_irq_thresh, int, S_IRUGO); -MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes"); - -/* initial park setting: slower than hw default */ -static unsigned park; -module_param(park, uint, S_IRUGO); -MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets"); - -/* for link power management(LPM) feature */ -static unsigned int hird; -module_param(hird, int, S_IRUGO); -MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us"); - -#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT) - -#include "fotg210.h" - -/*-------------------------------------------------------------------------*/ - -#define fotg210_dbg(fotg210, fmt, args...) \ - dev_dbg(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) -#define fotg210_err(fotg210, fmt, args...) \ - dev_err(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) -#define fotg210_info(fotg210, fmt, args...) \ - dev_info(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) -#define fotg210_warn(fotg210, fmt, args...) \ - dev_warn(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args) - -#ifdef VERBOSE_DEBUG -# define fotg210_vdbg fotg210_dbg -#else - static inline void fotg210_vdbg(struct fotg210_hcd *fotg210, ...) {} -#endif - -#ifdef DEBUG - -/* check the values in the HCSPARAMS register - * (host controller _Structural_ parameters) - * see EHCI spec, Table 2-4 for each value - */ -static void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label) -{ - u32 params = fotg210_readl(fotg210, &fotg210->caps->hcs_params); - - fotg210_dbg(fotg210, - "%s hcs_params 0x%x ports=%d\n", - label, params, - HCS_N_PORTS(params) - ); -} -#else - -static inline void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label) {} - -#endif - -#ifdef DEBUG - -/* check the values in the HCCPARAMS register - * (host controller _Capability_ parameters) - * see EHCI Spec, Table 2-5 for each value - * */ -static void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label) -{ - u32 params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); - - fotg210_dbg(fotg210, - "%s hcc_params %04x uframes %s%s\n", - label, - params, - HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024", - HCC_CANPARK(params) ? " park" : ""); -} -#else - -static inline void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label) {} - -#endif - -#ifdef DEBUG - -static void __maybe_unused -dbg_qtd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd) -{ - fotg210_dbg(fotg210, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd, - hc32_to_cpup(fotg210, &qtd->hw_next), - hc32_to_cpup(fotg210, &qtd->hw_alt_next), - hc32_to_cpup(fotg210, &qtd->hw_token), - hc32_to_cpup(fotg210, &qtd->hw_buf[0])); - if (qtd->hw_buf[1]) - fotg210_dbg(fotg210, " p1=%08x p2=%08x p3=%08x p4=%08x\n", - hc32_to_cpup(fotg210, &qtd->hw_buf[1]), - hc32_to_cpup(fotg210, &qtd->hw_buf[2]), - hc32_to_cpup(fotg210, &qtd->hw_buf[3]), - hc32_to_cpup(fotg210, &qtd->hw_buf[4])); -} - -static void __maybe_unused -dbg_qh(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - struct fotg210_qh_hw *hw = qh->hw; - - fotg210_dbg(fotg210, "%s qh %p n%08x info %x %x qtd %x\n", label, - qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current); - dbg_qtd("overlay", fotg210, (struct fotg210_qtd *) &hw->hw_qtd_next); -} - -static void __maybe_unused -dbg_itd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_itd *itd) -{ - fotg210_dbg(fotg210, "%s[%d] itd %p, next %08x, urb %p\n", - label, itd->frame, itd, hc32_to_cpu(fotg210, itd->hw_next), - itd->urb); - fotg210_dbg(fotg210, - " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n", - hc32_to_cpu(fotg210, itd->hw_transaction[0]), - hc32_to_cpu(fotg210, itd->hw_transaction[1]), - hc32_to_cpu(fotg210, itd->hw_transaction[2]), - hc32_to_cpu(fotg210, itd->hw_transaction[3]), - hc32_to_cpu(fotg210, itd->hw_transaction[4]), - hc32_to_cpu(fotg210, itd->hw_transaction[5]), - hc32_to_cpu(fotg210, itd->hw_transaction[6]), - hc32_to_cpu(fotg210, itd->hw_transaction[7])); - fotg210_dbg(fotg210, - " buf: %08x %08x %08x %08x %08x %08x %08x\n", - hc32_to_cpu(fotg210, itd->hw_bufp[0]), - hc32_to_cpu(fotg210, itd->hw_bufp[1]), - hc32_to_cpu(fotg210, itd->hw_bufp[2]), - hc32_to_cpu(fotg210, itd->hw_bufp[3]), - hc32_to_cpu(fotg210, itd->hw_bufp[4]), - hc32_to_cpu(fotg210, itd->hw_bufp[5]), - hc32_to_cpu(fotg210, itd->hw_bufp[6])); - fotg210_dbg(fotg210, " index: %d %d %d %d %d %d %d %d\n", - itd->index[0], itd->index[1], itd->index[2], - itd->index[3], itd->index[4], itd->index[5], - itd->index[6], itd->index[7]); -} - -static int __maybe_unused -dbg_status_buf(char *buf, unsigned len, const char *label, u32 status) -{ - return scnprintf(buf, len, - "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s", - label, label[0] ? " " : "", status, - (status & STS_ASS) ? " Async" : "", - (status & STS_PSS) ? " Periodic" : "", - (status & STS_RECL) ? " Recl" : "", - (status & STS_HALT) ? " Halt" : "", - (status & STS_IAA) ? " IAA" : "", - (status & STS_FATAL) ? " FATAL" : "", - (status & STS_FLR) ? " FLR" : "", - (status & STS_PCD) ? " PCD" : "", - (status & STS_ERR) ? " ERR" : "", - (status & STS_INT) ? " INT" : "" - ); -} - -static int __maybe_unused -dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable) -{ - return scnprintf(buf, len, - "%s%sintrenable %02x%s%s%s%s%s%s", - label, label[0] ? " " : "", enable, - (enable & STS_IAA) ? " IAA" : "", - (enable & STS_FATAL) ? " FATAL" : "", - (enable & STS_FLR) ? " FLR" : "", - (enable & STS_PCD) ? " PCD" : "", - (enable & STS_ERR) ? " ERR" : "", - (enable & STS_INT) ? " INT" : "" - ); -} - -static const char *const fls_strings[] = { "1024", "512", "256", "??" }; - -static int -dbg_command_buf(char *buf, unsigned len, const char *label, u32 command) -{ - return scnprintf(buf, len, - "%s%scommand %07x %s=%d ithresh=%d%s%s%s " - "period=%s%s %s", - label, label[0] ? " " : "", command, - (command & CMD_PARK) ? " park" : "(park)", - CMD_PARK_CNT(command), - (command >> 16) & 0x3f, - (command & CMD_IAAD) ? " IAAD" : "", - (command & CMD_ASE) ? " Async" : "", - (command & CMD_PSE) ? " Periodic" : "", - fls_strings[(command >> 2) & 0x3], - (command & CMD_RESET) ? " Reset" : "", - (command & CMD_RUN) ? "RUN" : "HALT" - ); -} - -static int -dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status) -{ - char *sig; - - /* signaling state */ - switch (status & (3 << 10)) { - case 0 << 10: - sig = "se0"; - break; - case 1 << 10: - sig = "k"; - break; /* low speed */ - case 2 << 10: - sig = "j"; - break; - default: - sig = "?"; - break; - } - - return scnprintf(buf, len, - "%s%sport:%d status %06x %d " - "sig=%s%s%s%s%s%s%s%s", - label, label[0] ? " " : "", port, status, - status>>25,/*device address */ - sig, - (status & PORT_RESET) ? " RESET" : "", - (status & PORT_SUSPEND) ? " SUSPEND" : "", - (status & PORT_RESUME) ? " RESUME" : "", - (status & PORT_PEC) ? " PEC" : "", - (status & PORT_PE) ? " PE" : "", - (status & PORT_CSC) ? " CSC" : "", - (status & PORT_CONNECT) ? " CONNECT" : ""); -} - -#else -static inline void __maybe_unused -dbg_qh(char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{} - -static inline int __maybe_unused -dbg_status_buf(char *buf, unsigned len, const char *label, u32 status) -{ return 0; } - -static inline int __maybe_unused -dbg_command_buf(char *buf, unsigned len, const char *label, u32 command) -{ return 0; } - -static inline int __maybe_unused -dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable) -{ return 0; } - -static inline int __maybe_unused -dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status) -{ return 0; } - -#endif /* DEBUG */ - -/* functions have the "wrong" filename when they're output... */ -#define dbg_status(fotg210, label, status) { \ - char _buf[80]; \ - dbg_status_buf(_buf, sizeof(_buf), label, status); \ - fotg210_dbg(fotg210, "%s\n", _buf); \ -} - -#define dbg_cmd(fotg210, label, command) { \ - char _buf[80]; \ - dbg_command_buf(_buf, sizeof(_buf), label, command); \ - fotg210_dbg(fotg210, "%s\n", _buf); \ -} - -#define dbg_port(fotg210, label, port, status) { \ - char _buf[80]; \ - dbg_port_buf(_buf, sizeof(_buf), label, port, status); \ - fotg210_dbg(fotg210, "%s\n", _buf); \ -} - -/*-------------------------------------------------------------------------*/ - -#ifdef STUB_DEBUG_FILES - -static inline void create_debug_files(struct fotg210_hcd *bus) { } -static inline void remove_debug_files(struct fotg210_hcd *bus) { } - -#else - -/* troubleshooting help: expose state in debugfs */ - -static int debug_async_open(struct inode *, struct file *); -static int debug_periodic_open(struct inode *, struct file *); -static int debug_registers_open(struct inode *, struct file *); -static int debug_async_open(struct inode *, struct file *); - -static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*); -static int debug_close(struct inode *, struct file *); - -static const struct file_operations debug_async_fops = { - .owner = THIS_MODULE, - .open = debug_async_open, - .read = debug_output, - .release = debug_close, - .llseek = default_llseek, -}; -static const struct file_operations debug_periodic_fops = { - .owner = THIS_MODULE, - .open = debug_periodic_open, - .read = debug_output, - .release = debug_close, - .llseek = default_llseek, -}; -static const struct file_operations debug_registers_fops = { - .owner = THIS_MODULE, - .open = debug_registers_open, - .read = debug_output, - .release = debug_close, - .llseek = default_llseek, -}; - -static struct dentry *fotg210_debug_root; - -struct debug_buffer { - ssize_t (*fill_func)(struct debug_buffer *); /* fill method */ - struct usb_bus *bus; - struct mutex mutex; /* protect filling of buffer */ - size_t count; /* number of characters filled into buffer */ - char *output_buf; - size_t alloc_size; -}; - -#define speed_char(info1)({ char tmp; \ - switch (info1 & (3 << 12)) { \ - case QH_FULL_SPEED: \ - tmp = 'f'; break; \ - case QH_LOW_SPEED: \ - tmp = 'l'; break; \ - case QH_HIGH_SPEED: \ - tmp = 'h'; break; \ - default: \ - tmp = '?'; break; \ - }; tmp; }) - -static inline char token_mark(struct fotg210_hcd *fotg210, __hc32 token) -{ - __u32 v = hc32_to_cpu(fotg210, token); - - if (v & QTD_STS_ACTIVE) - return '*'; - if (v & QTD_STS_HALT) - return '-'; - if (!IS_SHORT_READ(v)) - return ' '; - /* tries to advance through hw_alt_next */ - return '/'; -} - -static void qh_lines( - struct fotg210_hcd *fotg210, - struct fotg210_qh *qh, - char **nextp, - unsigned *sizep -) -{ - u32 scratch; - u32 hw_curr; - struct fotg210_qtd *td; - unsigned temp; - unsigned size = *sizep; - char *next = *nextp; - char mark; - __le32 list_end = FOTG210_LIST_END(fotg210); - struct fotg210_qh_hw *hw = qh->hw; - - if (hw->hw_qtd_next == list_end) /* NEC does this */ - mark = '@'; - else - mark = token_mark(fotg210, hw->hw_token); - if (mark == '/') { /* qh_alt_next controls qh advance? */ - if ((hw->hw_alt_next & QTD_MASK(fotg210)) - == fotg210->async->hw->hw_alt_next) - mark = '#'; /* blocked */ - else if (hw->hw_alt_next == list_end) - mark = '.'; /* use hw_qtd_next */ - /* else alt_next points to some other qtd */ - } - scratch = hc32_to_cpup(fotg210, &hw->hw_info1); - hw_curr = (mark == '*') ? hc32_to_cpup(fotg210, &hw->hw_current) : 0; - temp = scnprintf(next, size, - "qh/%p dev%d %cs ep%d %08x %08x(%08x%c %s nak%d)", - qh, scratch & 0x007f, - speed_char(scratch), - (scratch >> 8) & 0x000f, - scratch, hc32_to_cpup(fotg210, &hw->hw_info2), - hc32_to_cpup(fotg210, &hw->hw_token), mark, - (cpu_to_hc32(fotg210, QTD_TOGGLE) & hw->hw_token) - ? "data1" : "data0", - (hc32_to_cpup(fotg210, &hw->hw_alt_next) >> 1) & 0x0f); - size -= temp; - next += temp; - - /* hc may be modifying the list as we read it ... */ - list_for_each_entry(td, &qh->qtd_list, qtd_list) { - scratch = hc32_to_cpup(fotg210, &td->hw_token); - mark = ' '; - if (hw_curr == td->qtd_dma) - mark = '*'; - else if (hw->hw_qtd_next == cpu_to_hc32(fotg210, td->qtd_dma)) - mark = '+'; - else if (QTD_LENGTH(scratch)) { - if (td->hw_alt_next == fotg210->async->hw->hw_alt_next) - mark = '#'; - else if (td->hw_alt_next != list_end) - mark = '/'; - } - temp = snprintf(next, size, - "\n\t%p%c%s len=%d %08x urb %p", - td, mark, ({ char *tmp; - switch ((scratch>>8)&0x03) { - case 0: - tmp = "out"; - break; - case 1: - tmp = "in"; - break; - case 2: - tmp = "setup"; - break; - default: - tmp = "?"; - break; - } tmp; }), - (scratch >> 16) & 0x7fff, - scratch, - td->urb); - if (size < temp) - temp = size; - size -= temp; - next += temp; - if (temp == size) - goto done; - } - - temp = snprintf(next, size, "\n"); - if (size < temp) - temp = size; - size -= temp; - next += temp; - -done: - *sizep = size; - *nextp = next; -} - -static ssize_t fill_async_buffer(struct debug_buffer *buf) -{ - struct usb_hcd *hcd; - struct fotg210_hcd *fotg210; - unsigned long flags; - unsigned temp, size; - char *next; - struct fotg210_qh *qh; - - hcd = bus_to_hcd(buf->bus); - fotg210 = hcd_to_fotg210(hcd); - next = buf->output_buf; - size = buf->alloc_size; - - *next = 0; - - /* dumps a snapshot of the async schedule. - * usually empty except for long-term bulk reads, or head. - * one QH per line, and TDs we know about - */ - spin_lock_irqsave(&fotg210->lock, flags); - for (qh = fotg210->async->qh_next.qh; size > 0 && qh; - qh = qh->qh_next.qh) - qh_lines(fotg210, qh, &next, &size); - if (fotg210->async_unlink && size > 0) { - temp = scnprintf(next, size, "\nunlink =\n"); - size -= temp; - next += temp; - - for (qh = fotg210->async_unlink; size > 0 && qh; - qh = qh->unlink_next) - qh_lines(fotg210, qh, &next, &size); - } - spin_unlock_irqrestore(&fotg210->lock, flags); - - return strlen(buf->output_buf); -} - -#define DBG_SCHED_LIMIT 64 -static ssize_t fill_periodic_buffer(struct debug_buffer *buf) -{ - struct usb_hcd *hcd; - struct fotg210_hcd *fotg210; - unsigned long flags; - union fotg210_shadow p, *seen; - unsigned temp, size, seen_count; - char *next; - unsigned i; - __hc32 tag; - - seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC); - if (!seen) - return 0; - seen_count = 0; - - hcd = bus_to_hcd(buf->bus); - fotg210 = hcd_to_fotg210(hcd); - next = buf->output_buf; - size = buf->alloc_size; - - temp = scnprintf(next, size, "size = %d\n", fotg210->periodic_size); - size -= temp; - next += temp; - - /* dump a snapshot of the periodic schedule. - * iso changes, interrupt usually doesn't. - */ - spin_lock_irqsave(&fotg210->lock, flags); - for (i = 0; i < fotg210->periodic_size; i++) { - p = fotg210->pshadow[i]; - if (likely(!p.ptr)) - continue; - tag = Q_NEXT_TYPE(fotg210, fotg210->periodic[i]); - - temp = scnprintf(next, size, "%4d: ", i); - size -= temp; - next += temp; - - do { - struct fotg210_qh_hw *hw; - - switch (hc32_to_cpu(fotg210, tag)) { - case Q_TYPE_QH: - hw = p.qh->hw; - temp = scnprintf(next, size, " qh%d-%04x/%p", - p.qh->period, - hc32_to_cpup(fotg210, - &hw->hw_info2) - /* uframe masks */ - & (QH_CMASK | QH_SMASK), - p.qh); - size -= temp; - next += temp; - /* don't repeat what follows this qh */ - for (temp = 0; temp < seen_count; temp++) { - if (seen[temp].ptr != p.ptr) - continue; - if (p.qh->qh_next.ptr) { - temp = scnprintf(next, size, - " ..."); - size -= temp; - next += temp; - } - break; - } - /* show more info the first time around */ - if (temp == seen_count) { - u32 scratch = hc32_to_cpup(fotg210, - &hw->hw_info1); - struct fotg210_qtd *qtd; - char *type = ""; - - /* count tds, get ep direction */ - temp = 0; - list_for_each_entry(qtd, - &p.qh->qtd_list, - qtd_list) { - temp++; - switch (0x03 & (hc32_to_cpu( - fotg210, - qtd->hw_token) >> 8)) { - case 0: - type = "out"; - continue; - case 1: - type = "in"; - continue; - } - } - - temp = scnprintf(next, size, - "(%c%d ep%d%s " - "[%d/%d] q%d p%d)", - speed_char(scratch), - scratch & 0x007f, - (scratch >> 8) & 0x000f, type, - p.qh->usecs, p.qh->c_usecs, - temp, - 0x7ff & (scratch >> 16)); - - if (seen_count < DBG_SCHED_LIMIT) - seen[seen_count++].qh = p.qh; - } else - temp = 0; - tag = Q_NEXT_TYPE(fotg210, hw->hw_next); - p = p.qh->qh_next; - break; - case Q_TYPE_FSTN: - temp = scnprintf(next, size, - " fstn-%8x/%p", p.fstn->hw_prev, - p.fstn); - tag = Q_NEXT_TYPE(fotg210, p.fstn->hw_next); - p = p.fstn->fstn_next; - break; - case Q_TYPE_ITD: - temp = scnprintf(next, size, - " itd/%p", p.itd); - tag = Q_NEXT_TYPE(fotg210, p.itd->hw_next); - p = p.itd->itd_next; - break; - } - size -= temp; - next += temp; - } while (p.ptr); - - temp = scnprintf(next, size, "\n"); - size -= temp; - next += temp; - } - spin_unlock_irqrestore(&fotg210->lock, flags); - kfree(seen); - - return buf->alloc_size - size; -} -#undef DBG_SCHED_LIMIT - -static const char *rh_state_string(struct fotg210_hcd *fotg210) -{ - switch (fotg210->rh_state) { - case FOTG210_RH_HALTED: - return "halted"; - case FOTG210_RH_SUSPENDED: - return "suspended"; - case FOTG210_RH_RUNNING: - return "running"; - case FOTG210_RH_STOPPING: - return "stopping"; - } - return "?"; -} - -static ssize_t fill_registers_buffer(struct debug_buffer *buf) -{ - struct usb_hcd *hcd; - struct fotg210_hcd *fotg210; - unsigned long flags; - unsigned temp, size, i; - char *next, scratch[80]; - static const char fmt[] = "%*s\n"; - static const char label[] = ""; - - hcd = bus_to_hcd(buf->bus); - fotg210 = hcd_to_fotg210(hcd); - next = buf->output_buf; - size = buf->alloc_size; - - spin_lock_irqsave(&fotg210->lock, flags); - - if (!HCD_HW_ACCESSIBLE(hcd)) { - size = scnprintf(next, size, - "bus %s, device %s\n" - "%s\n" - "SUSPENDED(no register access)\n", - hcd->self.controller->bus->name, - dev_name(hcd->self.controller), - hcd->product_desc); - goto done; - } - - /* Capability Registers */ - i = HC_VERSION(fotg210, fotg210_readl(fotg210, - &fotg210->caps->hc_capbase)); - temp = scnprintf(next, size, - "bus %s, device %s\n" - "%s\n" - "EHCI %x.%02x, rh state %s\n", - hcd->self.controller->bus->name, - dev_name(hcd->self.controller), - hcd->product_desc, - i >> 8, i & 0x0ff, rh_state_string(fotg210)); - size -= temp; - next += temp; - - /* FIXME interpret both types of params */ - i = fotg210_readl(fotg210, &fotg210->caps->hcs_params); - temp = scnprintf(next, size, "structural params 0x%08x\n", i); - size -= temp; - next += temp; - - i = fotg210_readl(fotg210, &fotg210->caps->hcc_params); - temp = scnprintf(next, size, "capability params 0x%08x\n", i); - size -= temp; - next += temp; - - /* Operational Registers */ - temp = dbg_status_buf(scratch, sizeof(scratch), label, - fotg210_readl(fotg210, &fotg210->regs->status)); - temp = scnprintf(next, size, fmt, temp, scratch); - size -= temp; - next += temp; - - temp = dbg_command_buf(scratch, sizeof(scratch), label, - fotg210_readl(fotg210, &fotg210->regs->command)); - temp = scnprintf(next, size, fmt, temp, scratch); - size -= temp; - next += temp; - - temp = dbg_intr_buf(scratch, sizeof(scratch), label, - fotg210_readl(fotg210, &fotg210->regs->intr_enable)); - temp = scnprintf(next, size, fmt, temp, scratch); - size -= temp; - next += temp; - - temp = scnprintf(next, size, "uframe %04x\n", - fotg210_read_frame_index(fotg210)); - size -= temp; - next += temp; - - if (fotg210->async_unlink) { - temp = scnprintf(next, size, "async unlink qh %p\n", - fotg210->async_unlink); - size -= temp; - next += temp; - } - -#ifdef FOTG210_STATS - temp = scnprintf(next, size, - "irq normal %ld err %ld iaa %ld(lost %ld)\n", - fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa, - fotg210->stats.lost_iaa); - size -= temp; - next += temp; - - temp = scnprintf(next, size, "complete %ld unlink %ld\n", - fotg210->stats.complete, fotg210->stats.unlink); - size -= temp; - next += temp; -#endif - -done: - spin_unlock_irqrestore(&fotg210->lock, flags); - - return buf->alloc_size - size; -} - -static struct debug_buffer *alloc_buffer(struct usb_bus *bus, - ssize_t (*fill_func)(struct debug_buffer *)) -{ - struct debug_buffer *buf; - - buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL); - - if (buf) { - buf->bus = bus; - buf->fill_func = fill_func; - mutex_init(&buf->mutex); - buf->alloc_size = PAGE_SIZE; - } - - return buf; -} - -static int fill_buffer(struct debug_buffer *buf) -{ - int ret = 0; - - if (!buf->output_buf) - buf->output_buf = vmalloc(buf->alloc_size); - - if (!buf->output_buf) { - ret = -ENOMEM; - goto out; - } - - ret = buf->fill_func(buf); - - if (ret >= 0) { - buf->count = ret; - ret = 0; - } - -out: - return ret; -} - -static ssize_t debug_output(struct file *file, char __user *user_buf, - size_t len, loff_t *offset) -{ - struct debug_buffer *buf = file->private_data; - int ret = 0; - - mutex_lock(&buf->mutex); - if (buf->count == 0) { - ret = fill_buffer(buf); - if (ret != 0) { - mutex_unlock(&buf->mutex); - goto out; - } - } - mutex_unlock(&buf->mutex); - - ret = simple_read_from_buffer(user_buf, len, offset, - buf->output_buf, buf->count); - -out: - return ret; - -} - -static int debug_close(struct inode *inode, struct file *file) -{ - struct debug_buffer *buf = file->private_data; - - if (buf) { - vfree(buf->output_buf); - kfree(buf); - } - - return 0; -} -static int debug_async_open(struct inode *inode, struct file *file) -{ - file->private_data = alloc_buffer(inode->i_private, fill_async_buffer); - - return file->private_data ? 0 : -ENOMEM; -} - -static int debug_periodic_open(struct inode *inode, struct file *file) -{ - struct debug_buffer *buf; - buf = alloc_buffer(inode->i_private, fill_periodic_buffer); - if (!buf) - return -ENOMEM; - - buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE; - file->private_data = buf; - return 0; -} - -static int debug_registers_open(struct inode *inode, struct file *file) -{ - file->private_data = alloc_buffer(inode->i_private, - fill_registers_buffer); - - return file->private_data ? 0 : -ENOMEM; -} - -static inline void create_debug_files(struct fotg210_hcd *fotg210) -{ - struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self; - - fotg210->debug_dir = debugfs_create_dir(bus->bus_name, - fotg210_debug_root); - if (!fotg210->debug_dir) - return; - - if (!debugfs_create_file("async", S_IRUGO, fotg210->debug_dir, bus, - &debug_async_fops)) - goto file_error; - - if (!debugfs_create_file("periodic", S_IRUGO, fotg210->debug_dir, bus, - &debug_periodic_fops)) - goto file_error; - - if (!debugfs_create_file("registers", S_IRUGO, fotg210->debug_dir, bus, - &debug_registers_fops)) - goto file_error; - - return; - -file_error: - debugfs_remove_recursive(fotg210->debug_dir); -} - -static inline void remove_debug_files(struct fotg210_hcd *fotg210) -{ - debugfs_remove_recursive(fotg210->debug_dir); -} - -#endif /* STUB_DEBUG_FILES */ -/*-------------------------------------------------------------------------*/ - -/* - * handshake - spin reading hc until handshake completes or fails - * @ptr: address of hc register to be read - * @mask: bits to look at in result of read - * @done: value of those bits when handshake succeeds - * @usec: timeout in microseconds - * - * Returns negative errno, or zero on success - * - * Success happens when the "mask" bits have the specified value (hardware - * handshake done). There are two failure modes: "usec" have passed (major - * hardware flakeout), or the register reads as all-ones (hardware removed). - * - * That last failure should_only happen in cases like physical cardbus eject - * before driver shutdown. But it also seems to be caused by bugs in cardbus - * bridge shutdown: shutting down the bridge before the devices using it. - */ -static int handshake(struct fotg210_hcd *fotg210, void __iomem *ptr, - u32 mask, u32 done, int usec) -{ - u32 result; - - do { - result = fotg210_readl(fotg210, ptr); - if (result == ~(u32)0) /* card removed */ - return -ENODEV; - result &= mask; - if (result == done) - return 0; - udelay(1); - usec--; - } while (usec > 0); - return -ETIMEDOUT; -} - -/* - * Force HC to halt state from unknown (EHCI spec section 2.3). - * Must be called with interrupts enabled and the lock not held. - */ -static int fotg210_halt(struct fotg210_hcd *fotg210) -{ - u32 temp; - - spin_lock_irq(&fotg210->lock); - - /* disable any irqs left enabled by previous code */ - fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); - - /* - * This routine gets called during probe before fotg210->command - * has been initialized, so we can't rely on its value. - */ - fotg210->command &= ~CMD_RUN; - temp = fotg210_readl(fotg210, &fotg210->regs->command); - temp &= ~(CMD_RUN | CMD_IAAD); - fotg210_writel(fotg210, temp, &fotg210->regs->command); - - spin_unlock_irq(&fotg210->lock); - synchronize_irq(fotg210_to_hcd(fotg210)->irq); - - return handshake(fotg210, &fotg210->regs->status, - STS_HALT, STS_HALT, 16 * 125); -} - -/* - * Reset a non-running (STS_HALT == 1) controller. - * Must be called with interrupts enabled and the lock not held. - */ -static int fotg210_reset(struct fotg210_hcd *fotg210) -{ - int retval; - u32 command = fotg210_readl(fotg210, &fotg210->regs->command); - - /* If the EHCI debug controller is active, special care must be - * taken before and after a host controller reset */ - if (fotg210->debug && !dbgp_reset_prep(fotg210_to_hcd(fotg210))) - fotg210->debug = NULL; - - command |= CMD_RESET; - dbg_cmd(fotg210, "reset", command); - fotg210_writel(fotg210, command, &fotg210->regs->command); - fotg210->rh_state = FOTG210_RH_HALTED; - fotg210->next_statechange = jiffies; - retval = handshake(fotg210, &fotg210->regs->command, - CMD_RESET, 0, 250 * 1000); - - if (retval) - return retval; - - if (fotg210->debug) - dbgp_external_startup(fotg210_to_hcd(fotg210)); - - fotg210->port_c_suspend = fotg210->suspended_ports = - fotg210->resuming_ports = 0; - return retval; -} - -/* - * Idle the controller (turn off the schedules). - * Must be called with interrupts enabled and the lock not held. - */ -static void fotg210_quiesce(struct fotg210_hcd *fotg210) -{ - u32 temp; - - if (fotg210->rh_state != FOTG210_RH_RUNNING) - return; - - /* wait for any schedule enables/disables to take effect */ - temp = (fotg210->command << 10) & (STS_ASS | STS_PSS); - handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, temp, - 16 * 125); - - /* then disable anything that's still active */ - spin_lock_irq(&fotg210->lock); - fotg210->command &= ~(CMD_ASE | CMD_PSE); - fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); - spin_unlock_irq(&fotg210->lock); - - /* hardware can take 16 microframes to turn off ... */ - handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, 0, - 16 * 125); -} - -/*-------------------------------------------------------------------------*/ - -static void end_unlink_async(struct fotg210_hcd *fotg210); -static void unlink_empty_async(struct fotg210_hcd *fotg210); -static void fotg210_work(struct fotg210_hcd *fotg210); -static void start_unlink_intr(struct fotg210_hcd *fotg210, - struct fotg210_qh *qh); -static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); - -/*-------------------------------------------------------------------------*/ - -/* Set a bit in the USBCMD register */ -static void fotg210_set_command_bit(struct fotg210_hcd *fotg210, u32 bit) -{ - fotg210->command |= bit; - fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); - - /* unblock posted write */ - fotg210_readl(fotg210, &fotg210->regs->command); -} - -/* Clear a bit in the USBCMD register */ -static void fotg210_clear_command_bit(struct fotg210_hcd *fotg210, u32 bit) -{ - fotg210->command &= ~bit; - fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); - - /* unblock posted write */ - fotg210_readl(fotg210, &fotg210->regs->command); -} - -/*-------------------------------------------------------------------------*/ - -/* - * EHCI timer support... Now using hrtimers. - * - * Lots of different events are triggered from fotg210->hrtimer. Whenever - * the timer routine runs, it checks each possible event; events that are - * currently enabled and whose expiration time has passed get handled. - * The set of enabled events is stored as a collection of bitflags in - * fotg210->enabled_hrtimer_events, and they are numbered in order of - * increasing delay values (ranging between 1 ms and 100 ms). - * - * Rather than implementing a sorted list or tree of all pending events, - * we keep track only of the lowest-numbered pending event, in - * fotg210->next_hrtimer_event. Whenever fotg210->hrtimer gets restarted, its - * expiration time is set to the timeout value for this event. - * - * As a result, events might not get handled right away; the actual delay - * could be anywhere up to twice the requested delay. This doesn't - * matter, because none of the events are especially time-critical. The - * ones that matter most all have a delay of 1 ms, so they will be - * handled after 2 ms at most, which is okay. In addition to this, we - * allow for an expiration range of 1 ms. - */ - -/* - * Delay lengths for the hrtimer event types. - * Keep this list sorted by delay length, in the same order as - * the event types indexed by enum fotg210_hrtimer_event in fotg210.h. - */ -static unsigned event_delays_ns[] = { - 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_ASS */ - 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_PSS */ - 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_DEAD */ - 1125 * NSEC_PER_USEC, /* FOTG210_HRTIMER_UNLINK_INTR */ - 2 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_FREE_ITDS */ - 6 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_ASYNC_UNLINKS */ - 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IAA_WATCHDOG */ - 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_PERIODIC */ - 15 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_ASYNC */ - 100 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IO_WATCHDOG */ -}; - -/* Enable a pending hrtimer event */ -static void fotg210_enable_event(struct fotg210_hcd *fotg210, unsigned event, - bool resched) -{ - ktime_t *timeout = &fotg210->hr_timeouts[event]; - - if (resched) - *timeout = ktime_add(ktime_get(), - ktime_set(0, event_delays_ns[event])); - fotg210->enabled_hrtimer_events |= (1 << event); - - /* Track only the lowest-numbered pending event */ - if (event < fotg210->next_hrtimer_event) { - fotg210->next_hrtimer_event = event; - hrtimer_start_range_ns(&fotg210->hrtimer, *timeout, - NSEC_PER_MSEC, HRTIMER_MODE_ABS); - } -} - - -/* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */ -static void fotg210_poll_ASS(struct fotg210_hcd *fotg210) -{ - unsigned actual, want; - - /* Don't enable anything if the controller isn't running (e.g., died) */ - if (fotg210->rh_state != FOTG210_RH_RUNNING) - return; - - want = (fotg210->command & CMD_ASE) ? STS_ASS : 0; - actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_ASS; - - if (want != actual) { - - /* Poll again later, but give up after about 20 ms */ - if (fotg210->ASS_poll_count++ < 20) { - fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_ASS, - true); - return; - } - fotg210_dbg(fotg210, "Waited too long for the async schedule status (%x/%x), giving up\n", - want, actual); - } - fotg210->ASS_poll_count = 0; - - /* The status is up-to-date; restart or stop the schedule as needed */ - if (want == 0) { /* Stopped */ - if (fotg210->async_count > 0) - fotg210_set_command_bit(fotg210, CMD_ASE); - - } else { /* Running */ - if (fotg210->async_count == 0) { - - /* Turn off the schedule after a while */ - fotg210_enable_event(fotg210, - FOTG210_HRTIMER_DISABLE_ASYNC, - true); - } - } -} - -/* Turn off the async schedule after a brief delay */ -static void fotg210_disable_ASE(struct fotg210_hcd *fotg210) -{ - fotg210_clear_command_bit(fotg210, CMD_ASE); -} - - -/* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */ -static void fotg210_poll_PSS(struct fotg210_hcd *fotg210) -{ - unsigned actual, want; - - /* Don't do anything if the controller isn't running (e.g., died) */ - if (fotg210->rh_state != FOTG210_RH_RUNNING) - return; - - want = (fotg210->command & CMD_PSE) ? STS_PSS : 0; - actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_PSS; - - if (want != actual) { - - /* Poll again later, but give up after about 20 ms */ - if (fotg210->PSS_poll_count++ < 20) { - fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_PSS, - true); - return; - } - fotg210_dbg(fotg210, "Waited too long for the periodic schedule status (%x/%x), giving up\n", - want, actual); - } - fotg210->PSS_poll_count = 0; - - /* The status is up-to-date; restart or stop the schedule as needed */ - if (want == 0) { /* Stopped */ - if (fotg210->periodic_count > 0) - fotg210_set_command_bit(fotg210, CMD_PSE); - - } else { /* Running */ - if (fotg210->periodic_count == 0) { - - /* Turn off the schedule after a while */ - fotg210_enable_event(fotg210, - FOTG210_HRTIMER_DISABLE_PERIODIC, - true); - } - } -} - -/* Turn off the periodic schedule after a brief delay */ -static void fotg210_disable_PSE(struct fotg210_hcd *fotg210) -{ - fotg210_clear_command_bit(fotg210, CMD_PSE); -} - - -/* Poll the STS_HALT status bit; see when a dead controller stops */ -static void fotg210_handle_controller_death(struct fotg210_hcd *fotg210) -{ - if (!(fotg210_readl(fotg210, &fotg210->regs->status) & STS_HALT)) { - - /* Give up after a few milliseconds */ - if (fotg210->died_poll_count++ < 5) { - /* Try again later */ - fotg210_enable_event(fotg210, - FOTG210_HRTIMER_POLL_DEAD, true); - return; - } - fotg210_warn(fotg210, "Waited too long for the controller to stop, giving up\n"); - } - - /* Clean up the mess */ - fotg210->rh_state = FOTG210_RH_HALTED; - fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); - fotg210_work(fotg210); - end_unlink_async(fotg210); - - /* Not in process context, so don't try to reset the controller */ -} - - -/* Handle unlinked interrupt QHs once they are gone from the hardware */ -static void fotg210_handle_intr_unlinks(struct fotg210_hcd *fotg210) -{ - bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING); - - /* - * Process all the QHs on the intr_unlink list that were added - * before the current unlink cycle began. The list is in - * temporal order, so stop when we reach the first entry in the - * current cycle. But if the root hub isn't running then - * process all the QHs on the list. - */ - fotg210->intr_unlinking = true; - while (fotg210->intr_unlink) { - struct fotg210_qh *qh = fotg210->intr_unlink; - - if (!stopped && qh->unlink_cycle == fotg210->intr_unlink_cycle) - break; - fotg210->intr_unlink = qh->unlink_next; - qh->unlink_next = NULL; - end_unlink_intr(fotg210, qh); - } - - /* Handle remaining entries later */ - if (fotg210->intr_unlink) { - fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR, - true); - ++fotg210->intr_unlink_cycle; - } - fotg210->intr_unlinking = false; -} - - -/* Start another free-iTDs/siTDs cycle */ -static void start_free_itds(struct fotg210_hcd *fotg210) -{ - if (!(fotg210->enabled_hrtimer_events & - BIT(FOTG210_HRTIMER_FREE_ITDS))) { - fotg210->last_itd_to_free = list_entry( - fotg210->cached_itd_list.prev, - struct fotg210_itd, itd_list); - fotg210_enable_event(fotg210, FOTG210_HRTIMER_FREE_ITDS, true); - } -} - -/* Wait for controller to stop using old iTDs and siTDs */ -static void end_free_itds(struct fotg210_hcd *fotg210) -{ - struct fotg210_itd *itd, *n; - - if (fotg210->rh_state < FOTG210_RH_RUNNING) - fotg210->last_itd_to_free = NULL; - - list_for_each_entry_safe(itd, n, &fotg210->cached_itd_list, itd_list) { - list_del(&itd->itd_list); - dma_pool_free(fotg210->itd_pool, itd, itd->itd_dma); - if (itd == fotg210->last_itd_to_free) - break; - } - - if (!list_empty(&fotg210->cached_itd_list)) - start_free_itds(fotg210); -} - - -/* Handle lost (or very late) IAA interrupts */ -static void fotg210_iaa_watchdog(struct fotg210_hcd *fotg210) -{ - if (fotg210->rh_state != FOTG210_RH_RUNNING) - return; - - /* - * Lost IAA irqs wedge things badly; seen first with a vt8235. - * So we need this watchdog, but must protect it against both - * (a) SMP races against real IAA firing and retriggering, and - * (b) clean HC shutdown, when IAA watchdog was pending. - */ - if (fotg210->async_iaa) { - u32 cmd, status; - - /* If we get here, IAA is *REALLY* late. It's barely - * conceivable that the system is so busy that CMD_IAAD - * is still legitimately set, so let's be sure it's - * clear before we read STS_IAA. (The HC should clear - * CMD_IAAD when it sets STS_IAA.) - */ - cmd = fotg210_readl(fotg210, &fotg210->regs->command); - - /* - * If IAA is set here it either legitimately triggered - * after the watchdog timer expired (_way_ late, so we'll - * still count it as lost) ... or a silicon erratum: - * - VIA seems to set IAA without triggering the IRQ; - * - IAAD potentially cleared without setting IAA. - */ - status = fotg210_readl(fotg210, &fotg210->regs->status); - if ((status & STS_IAA) || !(cmd & CMD_IAAD)) { - COUNT(fotg210->stats.lost_iaa); - fotg210_writel(fotg210, STS_IAA, - &fotg210->regs->status); - } - - fotg210_vdbg(fotg210, "IAA watchdog: status %x cmd %x\n", - status, cmd); - end_unlink_async(fotg210); - } -} - - -/* Enable the I/O watchdog, if appropriate */ -static void turn_on_io_watchdog(struct fotg210_hcd *fotg210) -{ - /* Not needed if the controller isn't running or it's already enabled */ - if (fotg210->rh_state != FOTG210_RH_RUNNING || - (fotg210->enabled_hrtimer_events & - BIT(FOTG210_HRTIMER_IO_WATCHDOG))) - return; - - /* - * Isochronous transfers always need the watchdog. - * For other sorts we use it only if the flag is set. - */ - if (fotg210->isoc_count > 0 || (fotg210->need_io_watchdog && - fotg210->async_count + fotg210->intr_count > 0)) - fotg210_enable_event(fotg210, FOTG210_HRTIMER_IO_WATCHDOG, - true); -} - - -/* - * Handler functions for the hrtimer event types. - * Keep this array in the same order as the event types indexed by - * enum fotg210_hrtimer_event in fotg210.h. - */ -static void (*event_handlers[])(struct fotg210_hcd *) = { - fotg210_poll_ASS, /* FOTG210_HRTIMER_POLL_ASS */ - fotg210_poll_PSS, /* FOTG210_HRTIMER_POLL_PSS */ - fotg210_handle_controller_death, /* FOTG210_HRTIMER_POLL_DEAD */ - fotg210_handle_intr_unlinks, /* FOTG210_HRTIMER_UNLINK_INTR */ - end_free_itds, /* FOTG210_HRTIMER_FREE_ITDS */ - unlink_empty_async, /* FOTG210_HRTIMER_ASYNC_UNLINKS */ - fotg210_iaa_watchdog, /* FOTG210_HRTIMER_IAA_WATCHDOG */ - fotg210_disable_PSE, /* FOTG210_HRTIMER_DISABLE_PERIODIC */ - fotg210_disable_ASE, /* FOTG210_HRTIMER_DISABLE_ASYNC */ - fotg210_work, /* FOTG210_HRTIMER_IO_WATCHDOG */ -}; - -static enum hrtimer_restart fotg210_hrtimer_func(struct hrtimer *t) -{ - struct fotg210_hcd *fotg210 = - container_of(t, struct fotg210_hcd, hrtimer); - ktime_t now; - unsigned long events; - unsigned long flags; - unsigned e; - - spin_lock_irqsave(&fotg210->lock, flags); - - events = fotg210->enabled_hrtimer_events; - fotg210->enabled_hrtimer_events = 0; - fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT; - - /* - * Check each pending event. If its time has expired, handle - * the event; otherwise re-enable it. - */ - now = ktime_get(); - for_each_set_bit(e, &events, FOTG210_HRTIMER_NUM_EVENTS) { - if (now.tv64 >= fotg210->hr_timeouts[e].tv64) - event_handlers[e](fotg210); - else - fotg210_enable_event(fotg210, e, false); - } - - spin_unlock_irqrestore(&fotg210->lock, flags); - return HRTIMER_NORESTART; -} - -/*-------------------------------------------------------------------------*/ - -#define fotg210_bus_suspend NULL -#define fotg210_bus_resume NULL - -/*-------------------------------------------------------------------------*/ - -static int check_reset_complete( - struct fotg210_hcd *fotg210, - int index, - u32 __iomem *status_reg, - int port_status -) { - if (!(port_status & PORT_CONNECT)) - return port_status; - - /* if reset finished and it's still not enabled -- handoff */ - if (!(port_status & PORT_PE)) { - /* with integrated TT, there's nobody to hand it to! */ - fotg210_dbg(fotg210, - "Failed to enable port %d on root hub TT\n", - index+1); - return port_status; - } else { - fotg210_dbg(fotg210, "port %d reset complete, port enabled\n", - index + 1); - } - - return port_status; -} - -/*-------------------------------------------------------------------------*/ - - -/* build "status change" packet (one or two bytes) from HC registers */ - -static int -fotg210_hub_status_data(struct usb_hcd *hcd, char *buf) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - u32 temp, status; - u32 mask; - int retval = 1; - unsigned long flags; - - /* init status to no-changes */ - buf[0] = 0; - - /* Inform the core about resumes-in-progress by returning - * a non-zero value even if there are no status changes. - */ - status = fotg210->resuming_ports; - - mask = PORT_CSC | PORT_PEC; - /* PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND */ - - /* no hub change reports (bit 0) for now (power, ...) */ - - /* port N changes (bit N)? */ - spin_lock_irqsave(&fotg210->lock, flags); - - temp = fotg210_readl(fotg210, &fotg210->regs->port_status); - - /* - * Return status information even for ports with OWNER set. - * Otherwise khubd wouldn't see the disconnect event when a - * high-speed device is switched over to the companion - * controller by the user. - */ - - if ((temp & mask) != 0 || test_bit(0, &fotg210->port_c_suspend) - || (fotg210->reset_done[0] && time_after_eq( - jiffies, fotg210->reset_done[0]))) { - buf[0] |= 1 << 1; - status = STS_PCD; - } - /* FIXME autosuspend idle root hubs */ - spin_unlock_irqrestore(&fotg210->lock, flags); - return status ? retval : 0; -} - -/*-------------------------------------------------------------------------*/ - -static void -fotg210_hub_descriptor( - struct fotg210_hcd *fotg210, - struct usb_hub_descriptor *desc -) { - int ports = HCS_N_PORTS(fotg210->hcs_params); - u16 temp; - - desc->bDescriptorType = 0x29; - desc->bPwrOn2PwrGood = 10; /* fotg210 1.0, 2.3.9 says 20ms max */ - desc->bHubContrCurrent = 0; - - desc->bNbrPorts = ports; - temp = 1 + (ports / 8); - desc->bDescLength = 7 + 2 * temp; - - /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */ - memset(&desc->u.hs.DeviceRemovable[0], 0, temp); - memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp); - - temp = 0x0008; /* per-port overcurrent reporting */ - temp |= 0x0002; /* no power switching */ - desc->wHubCharacteristics = cpu_to_le16(temp); -} - -/*-------------------------------------------------------------------------*/ - -static int fotg210_hub_control( - struct usb_hcd *hcd, - u16 typeReq, - u16 wValue, - u16 wIndex, - char *buf, - u16 wLength -) { - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - int ports = HCS_N_PORTS(fotg210->hcs_params); - u32 __iomem *status_reg = &fotg210->regs->port_status; - u32 temp, temp1, status; - unsigned long flags; - int retval = 0; - unsigned selector; - - /* - * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR. - * HCS_INDICATOR may say we can change LEDs to off/amber/green. - * (track current state ourselves) ... blink for diagnostics, - * power, "this is the one", etc. EHCI spec supports this. - */ - - spin_lock_irqsave(&fotg210->lock, flags); - switch (typeReq) { - case ClearHubFeature: - switch (wValue) { - case C_HUB_LOCAL_POWER: - case C_HUB_OVER_CURRENT: - /* no hub-wide feature/status flags */ - break; - default: - goto error; - } - break; - case ClearPortFeature: - if (!wIndex || wIndex > ports) - goto error; - wIndex--; - temp = fotg210_readl(fotg210, status_reg); - temp &= ~PORT_RWC_BITS; - - /* - * Even if OWNER is set, so the port is owned by the - * companion controller, khubd needs to be able to clear - * the port-change status bits (especially - * USB_PORT_STAT_C_CONNECTION). - */ - - switch (wValue) { - case USB_PORT_FEAT_ENABLE: - fotg210_writel(fotg210, temp & ~PORT_PE, status_reg); - break; - case USB_PORT_FEAT_C_ENABLE: - fotg210_writel(fotg210, temp | PORT_PEC, status_reg); - break; - case USB_PORT_FEAT_SUSPEND: - if (temp & PORT_RESET) - goto error; - if (!(temp & PORT_SUSPEND)) - break; - if ((temp & PORT_PE) == 0) - goto error; - - /* resume signaling for 20 msec */ - fotg210_writel(fotg210, temp | PORT_RESUME, status_reg); - fotg210->reset_done[wIndex] = jiffies - + msecs_to_jiffies(20); - break; - case USB_PORT_FEAT_C_SUSPEND: - clear_bit(wIndex, &fotg210->port_c_suspend); - break; - case USB_PORT_FEAT_C_CONNECTION: - fotg210_writel(fotg210, temp | PORT_CSC, status_reg); - break; - case USB_PORT_FEAT_C_OVER_CURRENT: - fotg210_writel(fotg210, temp | OTGISR_OVC, - &fotg210->regs->otgisr); - break; - case USB_PORT_FEAT_C_RESET: - /* GetPortStatus clears reset */ - break; - default: - goto error; - } - fotg210_readl(fotg210, &fotg210->regs->command); - break; - case GetHubDescriptor: - fotg210_hub_descriptor(fotg210, (struct usb_hub_descriptor *) - buf); - break; - case GetHubStatus: - /* no hub-wide feature/status flags */ - memset(buf, 0, 4); - /*cpu_to_le32s ((u32 *) buf); */ - break; - case GetPortStatus: - if (!wIndex || wIndex > ports) - goto error; - wIndex--; - status = 0; - temp = fotg210_readl(fotg210, status_reg); - - /* wPortChange bits */ - if (temp & PORT_CSC) - status |= USB_PORT_STAT_C_CONNECTION << 16; - if (temp & PORT_PEC) - status |= USB_PORT_STAT_C_ENABLE << 16; - - temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr); - if (temp1 & OTGISR_OVC) - status |= USB_PORT_STAT_C_OVERCURRENT << 16; - - /* whoever resumes must GetPortStatus to complete it!! */ - if (temp & PORT_RESUME) { - - /* Remote Wakeup received? */ - if (!fotg210->reset_done[wIndex]) { - /* resume signaling for 20 msec */ - fotg210->reset_done[wIndex] = jiffies - + msecs_to_jiffies(20); - /* check the port again */ - mod_timer(&fotg210_to_hcd(fotg210)->rh_timer, - fotg210->reset_done[wIndex]); - } - - /* resume completed? */ - else if (time_after_eq(jiffies, - fotg210->reset_done[wIndex])) { - clear_bit(wIndex, &fotg210->suspended_ports); - set_bit(wIndex, &fotg210->port_c_suspend); - fotg210->reset_done[wIndex] = 0; - - /* stop resume signaling */ - temp = fotg210_readl(fotg210, status_reg); - fotg210_writel(fotg210, - temp & ~(PORT_RWC_BITS | PORT_RESUME), - status_reg); - clear_bit(wIndex, &fotg210->resuming_ports); - retval = handshake(fotg210, status_reg, - PORT_RESUME, 0, 2000 /* 2msec */); - if (retval != 0) { - fotg210_err(fotg210, - "port %d resume error %d\n", - wIndex + 1, retval); - goto error; - } - temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10)); - } - } - - /* whoever resets must GetPortStatus to complete it!! */ - if ((temp & PORT_RESET) - && time_after_eq(jiffies, - fotg210->reset_done[wIndex])) { - status |= USB_PORT_STAT_C_RESET << 16; - fotg210->reset_done[wIndex] = 0; - clear_bit(wIndex, &fotg210->resuming_ports); - - /* force reset to complete */ - fotg210_writel(fotg210, - temp & ~(PORT_RWC_BITS | PORT_RESET), - status_reg); - /* REVISIT: some hardware needs 550+ usec to clear - * this bit; seems too long to spin routinely... - */ - retval = handshake(fotg210, status_reg, - PORT_RESET, 0, 1000); - if (retval != 0) { - fotg210_err(fotg210, "port %d reset error %d\n", - wIndex + 1, retval); - goto error; - } - - /* see what we found out */ - temp = check_reset_complete(fotg210, wIndex, status_reg, - fotg210_readl(fotg210, status_reg)); - } - - if (!(temp & (PORT_RESUME|PORT_RESET))) { - fotg210->reset_done[wIndex] = 0; - clear_bit(wIndex, &fotg210->resuming_ports); - } - - /* transfer dedicated ports to the companion hc */ - if ((temp & PORT_CONNECT) && - test_bit(wIndex, &fotg210->companion_ports)) { - temp &= ~PORT_RWC_BITS; - fotg210_writel(fotg210, temp, status_reg); - fotg210_dbg(fotg210, "port %d --> companion\n", - wIndex + 1); - temp = fotg210_readl(fotg210, status_reg); - } - - /* - * Even if OWNER is set, there's no harm letting khubd - * see the wPortStatus values (they should all be 0 except - * for PORT_POWER anyway). - */ - - if (temp & PORT_CONNECT) { - status |= USB_PORT_STAT_CONNECTION; - status |= fotg210_port_speed(fotg210, temp); - } - if (temp & PORT_PE) - status |= USB_PORT_STAT_ENABLE; - - /* maybe the port was unsuspended without our knowledge */ - if (temp & (PORT_SUSPEND|PORT_RESUME)) { - status |= USB_PORT_STAT_SUSPEND; - } else if (test_bit(wIndex, &fotg210->suspended_ports)) { - clear_bit(wIndex, &fotg210->suspended_ports); - clear_bit(wIndex, &fotg210->resuming_ports); - fotg210->reset_done[wIndex] = 0; - if (temp & PORT_PE) - set_bit(wIndex, &fotg210->port_c_suspend); - } - - temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr); - if (temp1 & OTGISR_OVC) - status |= USB_PORT_STAT_OVERCURRENT; - if (temp & PORT_RESET) - status |= USB_PORT_STAT_RESET; - if (test_bit(wIndex, &fotg210->port_c_suspend)) - status |= USB_PORT_STAT_C_SUSPEND << 16; - -#ifndef VERBOSE_DEBUG - if (status & ~0xffff) /* only if wPortChange is interesting */ -#endif - dbg_port(fotg210, "GetStatus", wIndex + 1, temp); - put_unaligned_le32(status, buf); - break; - case SetHubFeature: - switch (wValue) { - case C_HUB_LOCAL_POWER: - case C_HUB_OVER_CURRENT: - /* no hub-wide feature/status flags */ - break; - default: - goto error; - } - break; - case SetPortFeature: - selector = wIndex >> 8; - wIndex &= 0xff; - - if (!wIndex || wIndex > ports) - goto error; - wIndex--; - temp = fotg210_readl(fotg210, status_reg); - temp &= ~PORT_RWC_BITS; - switch (wValue) { - case USB_PORT_FEAT_SUSPEND: - if ((temp & PORT_PE) == 0 - || (temp & PORT_RESET) != 0) - goto error; - - /* After above check the port must be connected. - * Set appropriate bit thus could put phy into low power - * mode if we have hostpc feature - */ - fotg210_writel(fotg210, temp | PORT_SUSPEND, - status_reg); - set_bit(wIndex, &fotg210->suspended_ports); - break; - case USB_PORT_FEAT_RESET: - if (temp & PORT_RESUME) - goto error; - /* line status bits may report this as low speed, - * which can be fine if this root hub has a - * transaction translator built in. - */ - fotg210_vdbg(fotg210, "port %d reset\n", wIndex + 1); - temp |= PORT_RESET; - temp &= ~PORT_PE; - - /* - * caller must wait, then call GetPortStatus - * usb 2.0 spec says 50 ms resets on root - */ - fotg210->reset_done[wIndex] = jiffies - + msecs_to_jiffies(50); - fotg210_writel(fotg210, temp, status_reg); - break; - - /* For downstream facing ports (these): one hub port is put - * into test mode according to USB2 11.24.2.13, then the hub - * must be reset (which for root hub now means rmmod+modprobe, - * or else system reboot). See EHCI 2.3.9 and 4.14 for info - * about the EHCI-specific stuff. - */ - case USB_PORT_FEAT_TEST: - if (!selector || selector > 5) - goto error; - spin_unlock_irqrestore(&fotg210->lock, flags); - fotg210_quiesce(fotg210); - spin_lock_irqsave(&fotg210->lock, flags); - - /* Put all enabled ports into suspend */ - temp = fotg210_readl(fotg210, status_reg) & - ~PORT_RWC_BITS; - if (temp & PORT_PE) - fotg210_writel(fotg210, temp | PORT_SUSPEND, - status_reg); - - spin_unlock_irqrestore(&fotg210->lock, flags); - fotg210_halt(fotg210); - spin_lock_irqsave(&fotg210->lock, flags); - - temp = fotg210_readl(fotg210, status_reg); - temp |= selector << 16; - fotg210_writel(fotg210, temp, status_reg); - break; - - default: - goto error; - } - fotg210_readl(fotg210, &fotg210->regs->command); - break; - - default: -error: - /* "stall" on error */ - retval = -EPIPE; - } - spin_unlock_irqrestore(&fotg210->lock, flags); - return retval; -} - -static void __maybe_unused fotg210_relinquish_port(struct usb_hcd *hcd, - int portnum) -{ - return; -} - -static int __maybe_unused fotg210_port_handed_over(struct usb_hcd *hcd, - int portnum) -{ - return 0; -} -/*-------------------------------------------------------------------------*/ -/* - * There's basically three types of memory: - * - data used only by the HCD ... kmalloc is fine - * - async and periodic schedules, shared by HC and HCD ... these - * need to use dma_pool or dma_alloc_coherent - * - driver buffers, read/written by HC ... single shot DMA mapped - * - * There's also "register" data (e.g. PCI or SOC), which is memory mapped. - * No memory seen by this driver is pageable. - */ - -/*-------------------------------------------------------------------------*/ - -/* Allocate the key transfer structures from the previously allocated pool */ - -static inline void fotg210_qtd_init(struct fotg210_hcd *fotg210, - struct fotg210_qtd *qtd, dma_addr_t dma) -{ - memset(qtd, 0, sizeof(*qtd)); - qtd->qtd_dma = dma; - qtd->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT); - qtd->hw_next = FOTG210_LIST_END(fotg210); - qtd->hw_alt_next = FOTG210_LIST_END(fotg210); - INIT_LIST_HEAD(&qtd->qtd_list); -} - -static struct fotg210_qtd *fotg210_qtd_alloc(struct fotg210_hcd *fotg210, - gfp_t flags) -{ - struct fotg210_qtd *qtd; - dma_addr_t dma; - - qtd = dma_pool_alloc(fotg210->qtd_pool, flags, &dma); - if (qtd != NULL) - fotg210_qtd_init(fotg210, qtd, dma); - - return qtd; -} - -static inline void fotg210_qtd_free(struct fotg210_hcd *fotg210, - struct fotg210_qtd *qtd) -{ - dma_pool_free(fotg210->qtd_pool, qtd, qtd->qtd_dma); -} - - -static void qh_destroy(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - /* clean qtds first, and know this is not linked */ - if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) { - fotg210_dbg(fotg210, "unused qh not empty!\n"); - BUG(); - } - if (qh->dummy) - fotg210_qtd_free(fotg210, qh->dummy); - dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma); - kfree(qh); -} - -static struct fotg210_qh *fotg210_qh_alloc(struct fotg210_hcd *fotg210, - gfp_t flags) -{ - struct fotg210_qh *qh; - dma_addr_t dma; - - qh = kzalloc(sizeof(*qh), GFP_ATOMIC); - if (!qh) - goto done; - qh->hw = (struct fotg210_qh_hw *) - dma_pool_alloc(fotg210->qh_pool, flags, &dma); - if (!qh->hw) - goto fail; - memset(qh->hw, 0, sizeof(*qh->hw)); - qh->qh_dma = dma; - INIT_LIST_HEAD(&qh->qtd_list); - - /* dummy td enables safe urb queuing */ - qh->dummy = fotg210_qtd_alloc(fotg210, flags); - if (qh->dummy == NULL) { - fotg210_dbg(fotg210, "no dummy td\n"); - goto fail1; - } -done: - return qh; -fail1: - dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma); -fail: - kfree(qh); - return NULL; -} - -/*-------------------------------------------------------------------------*/ - -/* The queue heads and transfer descriptors are managed from pools tied - * to each of the "per device" structures. - * This is the initialisation and cleanup code. - */ - -static void fotg210_mem_cleanup(struct fotg210_hcd *fotg210) -{ - if (fotg210->async) - qh_destroy(fotg210, fotg210->async); - fotg210->async = NULL; - - if (fotg210->dummy) - qh_destroy(fotg210, fotg210->dummy); - fotg210->dummy = NULL; - - /* DMA consistent memory and pools */ - if (fotg210->qtd_pool) - dma_pool_destroy(fotg210->qtd_pool); - fotg210->qtd_pool = NULL; - - if (fotg210->qh_pool) { - dma_pool_destroy(fotg210->qh_pool); - fotg210->qh_pool = NULL; - } - - if (fotg210->itd_pool) - dma_pool_destroy(fotg210->itd_pool); - fotg210->itd_pool = NULL; - - if (fotg210->periodic) - dma_free_coherent(fotg210_to_hcd(fotg210)->self.controller, - fotg210->periodic_size * sizeof(u32), - fotg210->periodic, fotg210->periodic_dma); - fotg210->periodic = NULL; - - /* shadow periodic table */ - kfree(fotg210->pshadow); - fotg210->pshadow = NULL; -} - -/* remember to add cleanup code (above) if you add anything here */ -static int fotg210_mem_init(struct fotg210_hcd *fotg210, gfp_t flags) -{ - int i; - - /* QTDs for control/bulk/intr transfers */ - fotg210->qtd_pool = dma_pool_create("fotg210_qtd", - fotg210_to_hcd(fotg210)->self.controller, - sizeof(struct fotg210_qtd), - 32 /* byte alignment (for hw parts) */, - 4096 /* can't cross 4K */); - if (!fotg210->qtd_pool) - goto fail; - - /* QHs for control/bulk/intr transfers */ - fotg210->qh_pool = dma_pool_create("fotg210_qh", - fotg210_to_hcd(fotg210)->self.controller, - sizeof(struct fotg210_qh_hw), - 32 /* byte alignment (for hw parts) */, - 4096 /* can't cross 4K */); - if (!fotg210->qh_pool) - goto fail; - - fotg210->async = fotg210_qh_alloc(fotg210, flags); - if (!fotg210->async) - goto fail; - - /* ITD for high speed ISO transfers */ - fotg210->itd_pool = dma_pool_create("fotg210_itd", - fotg210_to_hcd(fotg210)->self.controller, - sizeof(struct fotg210_itd), - 64 /* byte alignment (for hw parts) */, - 4096 /* can't cross 4K */); - if (!fotg210->itd_pool) - goto fail; - - /* Hardware periodic table */ - fotg210->periodic = (__le32 *) - dma_alloc_coherent(fotg210_to_hcd(fotg210)->self.controller, - fotg210->periodic_size * sizeof(__le32), - &fotg210->periodic_dma, 0); - if (fotg210->periodic == NULL) - goto fail; - - for (i = 0; i < fotg210->periodic_size; i++) - fotg210->periodic[i] = FOTG210_LIST_END(fotg210); - - /* software shadow of hardware table */ - fotg210->pshadow = kcalloc(fotg210->periodic_size, sizeof(void *), - flags); - if (fotg210->pshadow != NULL) - return 0; - -fail: - fotg210_dbg(fotg210, "couldn't init memory\n"); - fotg210_mem_cleanup(fotg210); - return -ENOMEM; -} -/*-------------------------------------------------------------------------*/ -/* - * EHCI hardware queue manipulation ... the core. QH/QTD manipulation. - * - * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd" - * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned - * buffers needed for the larger number). We use one QH per endpoint, queue - * multiple urbs (all three types) per endpoint. URBs may need several qtds. - * - * ISO traffic uses "ISO TD" (itd) records, and (along with - * interrupts) needs careful scheduling. Performance improvements can be - * an ongoing challenge. That's in "ehci-sched.c". - * - * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs, - * or otherwise through transaction translators (TTs) in USB 2.0 hubs using - * (b) special fields in qh entries or (c) split iso entries. TTs will - * buffer low/full speed data so the host collects it at high speed. - */ - -/*-------------------------------------------------------------------------*/ - -/* fill a qtd, returning how much of the buffer we were able to queue up */ - -static int -qtd_fill(struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd, dma_addr_t buf, - size_t len, int token, int maxpacket) -{ - int i, count; - u64 addr = buf; - - /* one buffer entry per 4K ... first might be short or unaligned */ - qtd->hw_buf[0] = cpu_to_hc32(fotg210, (u32)addr); - qtd->hw_buf_hi[0] = cpu_to_hc32(fotg210, (u32)(addr >> 32)); - count = 0x1000 - (buf & 0x0fff); /* rest of that page */ - if (likely(len < count)) /* ... iff needed */ - count = len; - else { - buf += 0x1000; - buf &= ~0x0fff; - - /* per-qtd limit: from 16K to 20K (best alignment) */ - for (i = 1; count < len && i < 5; i++) { - addr = buf; - qtd->hw_buf[i] = cpu_to_hc32(fotg210, (u32)addr); - qtd->hw_buf_hi[i] = cpu_to_hc32(fotg210, - (u32)(addr >> 32)); - buf += 0x1000; - if ((count + 0x1000) < len) - count += 0x1000; - else - count = len; - } - - /* short packets may only terminate transfers */ - if (count != len) - count -= (count % maxpacket); - } - qtd->hw_token = cpu_to_hc32(fotg210, (count << 16) | token); - qtd->length = count; - - return count; -} - -/*-------------------------------------------------------------------------*/ - -static inline void -qh_update(struct fotg210_hcd *fotg210, struct fotg210_qh *qh, - struct fotg210_qtd *qtd) -{ - struct fotg210_qh_hw *hw = qh->hw; - - /* writes to an active overlay are unsafe */ - BUG_ON(qh->qh_state != QH_STATE_IDLE); - - hw->hw_qtd_next = QTD_NEXT(fotg210, qtd->qtd_dma); - hw->hw_alt_next = FOTG210_LIST_END(fotg210); - - /* Except for control endpoints, we make hardware maintain data - * toggle (like OHCI) ... here (re)initialize the toggle in the QH, - * and set the pseudo-toggle in udev. Only usb_clear_halt() will - * ever clear it. - */ - if (!(hw->hw_info1 & cpu_to_hc32(fotg210, QH_TOGGLE_CTL))) { - unsigned is_out, epnum; - - is_out = qh->is_out; - epnum = (hc32_to_cpup(fotg210, &hw->hw_info1) >> 8) & 0x0f; - if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) { - hw->hw_token &= ~cpu_to_hc32(fotg210, QTD_TOGGLE); - usb_settoggle(qh->dev, epnum, is_out, 1); - } - } - - hw->hw_token &= cpu_to_hc32(fotg210, QTD_TOGGLE | QTD_STS_PING); -} - -/* if it weren't for a common silicon quirk (writing the dummy into the qh - * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault - * recovery (including urb dequeue) would need software changes to a QH... - */ -static void -qh_refresh(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - struct fotg210_qtd *qtd; - - if (list_empty(&qh->qtd_list)) - qtd = qh->dummy; - else { - qtd = list_entry(qh->qtd_list.next, - struct fotg210_qtd, qtd_list); - /* - * first qtd may already be partially processed. - * If we come here during unlink, the QH overlay region - * might have reference to the just unlinked qtd. The - * qtd is updated in qh_completions(). Update the QH - * overlay here. - */ - if (cpu_to_hc32(fotg210, qtd->qtd_dma) == qh->hw->hw_current) { - qh->hw->hw_qtd_next = qtd->hw_next; - qtd = NULL; - } - } - - if (qtd) - qh_update(fotg210, qh, qtd); -} - -/*-------------------------------------------------------------------------*/ - -static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); - -static void fotg210_clear_tt_buffer_complete(struct usb_hcd *hcd, - struct usb_host_endpoint *ep) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - struct fotg210_qh *qh = ep->hcpriv; - unsigned long flags; - - spin_lock_irqsave(&fotg210->lock, flags); - qh->clearing_tt = 0; - if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list) - && fotg210->rh_state == FOTG210_RH_RUNNING) - qh_link_async(fotg210, qh); - spin_unlock_irqrestore(&fotg210->lock, flags); -} - -static void fotg210_clear_tt_buffer(struct fotg210_hcd *fotg210, - struct fotg210_qh *qh, - struct urb *urb, u32 token) -{ - - /* If an async split transaction gets an error or is unlinked, - * the TT buffer may be left in an indeterminate state. We - * have to clear the TT buffer. - * - * Note: this routine is never called for Isochronous transfers. - */ - if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) { -#ifdef DEBUG - struct usb_device *tt = urb->dev->tt->hub; - dev_dbg(&tt->dev, - "clear tt buffer port %d, a%d ep%d t%08x\n", - urb->dev->ttport, urb->dev->devnum, - usb_pipeendpoint(urb->pipe), token); -#endif /* DEBUG */ - if (urb->dev->tt->hub != - fotg210_to_hcd(fotg210)->self.root_hub) { - if (usb_hub_clear_tt_buffer(urb) == 0) - qh->clearing_tt = 1; - } - } -} - -static int qtd_copy_status( - struct fotg210_hcd *fotg210, - struct urb *urb, - size_t length, - u32 token -) -{ - int status = -EINPROGRESS; - - /* count IN/OUT bytes, not SETUP (even short packets) */ - if (likely(QTD_PID(token) != 2)) - urb->actual_length += length - QTD_LENGTH(token); - - /* don't modify error codes */ - if (unlikely(urb->unlinked)) - return status; - - /* force cleanup after short read; not always an error */ - if (unlikely(IS_SHORT_READ(token))) - status = -EREMOTEIO; - - /* serious "can't proceed" faults reported by the hardware */ - if (token & QTD_STS_HALT) { - if (token & QTD_STS_BABBLE) { - /* FIXME "must" disable babbling device's port too */ - status = -EOVERFLOW; - /* CERR nonzero + halt --> stall */ - } else if (QTD_CERR(token)) { - status = -EPIPE; - - /* In theory, more than one of the following bits can be set - * since they are sticky and the transaction is retried. - * Which to test first is rather arbitrary. - */ - } else if (token & QTD_STS_MMF) { - /* fs/ls interrupt xfer missed the complete-split */ - status = -EPROTO; - } else if (token & QTD_STS_DBE) { - status = (QTD_PID(token) == 1) /* IN ? */ - ? -ENOSR /* hc couldn't read data */ - : -ECOMM; /* hc couldn't write data */ - } else if (token & QTD_STS_XACT) { - /* timeout, bad CRC, wrong PID, etc */ - fotg210_dbg(fotg210, "devpath %s ep%d%s 3strikes\n", - urb->dev->devpath, - usb_pipeendpoint(urb->pipe), - usb_pipein(urb->pipe) ? "in" : "out"); - status = -EPROTO; - } else { /* unknown */ - status = -EPROTO; - } - - fotg210_vdbg(fotg210, - "dev%d ep%d%s qtd token %08x --> status %d\n", - usb_pipedevice(urb->pipe), - usb_pipeendpoint(urb->pipe), - usb_pipein(urb->pipe) ? "in" : "out", - token, status); - } - - return status; -} - -static void -fotg210_urb_done(struct fotg210_hcd *fotg210, struct urb *urb, int status) -__releases(fotg210->lock) -__acquires(fotg210->lock) -{ - if (likely(urb->hcpriv != NULL)) { - struct fotg210_qh *qh = (struct fotg210_qh *) urb->hcpriv; - - /* S-mask in a QH means it's an interrupt urb */ - if ((qh->hw->hw_info2 & cpu_to_hc32(fotg210, QH_SMASK)) != 0) { - - /* ... update hc-wide periodic stats (for usbfs) */ - fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs--; - } - } - - if (unlikely(urb->unlinked)) { - COUNT(fotg210->stats.unlink); - } else { - /* report non-error and short read status as zero */ - if (status == -EINPROGRESS || status == -EREMOTEIO) - status = 0; - COUNT(fotg210->stats.complete); - } - -#ifdef FOTG210_URB_TRACE - fotg210_dbg(fotg210, - "%s %s urb %p ep%d%s status %d len %d/%d\n", - __func__, urb->dev->devpath, urb, - usb_pipeendpoint(urb->pipe), - usb_pipein(urb->pipe) ? "in" : "out", - status, - urb->actual_length, urb->transfer_buffer_length); -#endif - - /* complete() can reenter this HCD */ - usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); - spin_unlock(&fotg210->lock); - usb_hcd_giveback_urb(fotg210_to_hcd(fotg210), urb, status); - spin_lock(&fotg210->lock); -} - -static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh); - -/* - * Process and free completed qtds for a qh, returning URBs to drivers. - * Chases up to qh->hw_current. Returns number of completions called, - * indicating how much "real" work we did. - */ -static unsigned -qh_completions(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - struct fotg210_qtd *last, *end = qh->dummy; - struct list_head *entry, *tmp; - int last_status; - int stopped; - unsigned count = 0; - u8 state; - struct fotg210_qh_hw *hw = qh->hw; - - if (unlikely(list_empty(&qh->qtd_list))) - return count; - - /* completions (or tasks on other cpus) must never clobber HALT - * till we've gone through and cleaned everything up, even when - * they add urbs to this qh's queue or mark them for unlinking. - * - * NOTE: unlinking expects to be done in queue order. - * - * It's a bug for qh->qh_state to be anything other than - * QH_STATE_IDLE, unless our caller is scan_async() or - * scan_intr(). - */ - state = qh->qh_state; - qh->qh_state = QH_STATE_COMPLETING; - stopped = (state == QH_STATE_IDLE); - - rescan: - last = NULL; - last_status = -EINPROGRESS; - qh->needs_rescan = 0; - - /* remove de-activated QTDs from front of queue. - * after faults (including short reads), cleanup this urb - * then let the queue advance. - * if queue is stopped, handles unlinks. - */ - list_for_each_safe(entry, tmp, &qh->qtd_list) { - struct fotg210_qtd *qtd; - struct urb *urb; - u32 token = 0; - - qtd = list_entry(entry, struct fotg210_qtd, qtd_list); - urb = qtd->urb; - - /* clean up any state from previous QTD ...*/ - if (last) { - if (likely(last->urb != urb)) { - fotg210_urb_done(fotg210, last->urb, - last_status); - count++; - last_status = -EINPROGRESS; - } - fotg210_qtd_free(fotg210, last); - last = NULL; - } - - /* ignore urbs submitted during completions we reported */ - if (qtd == end) - break; - - /* hardware copies qtd out of qh overlay */ - rmb(); - token = hc32_to_cpu(fotg210, qtd->hw_token); - - /* always clean up qtds the hc de-activated */ - retry_xacterr: - if ((token & QTD_STS_ACTIVE) == 0) { - - /* Report Data Buffer Error: non-fatal but useful */ - if (token & QTD_STS_DBE) - fotg210_dbg(fotg210, - "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n", - urb, - usb_endpoint_num(&urb->ep->desc), - usb_endpoint_dir_in(&urb->ep->desc) - ? "in" : "out", - urb->transfer_buffer_length, - qtd, - qh); - - /* on STALL, error, and short reads this urb must - * complete and all its qtds must be recycled. - */ - if ((token & QTD_STS_HALT) != 0) { - - /* retry transaction errors until we - * reach the software xacterr limit - */ - if ((token & QTD_STS_XACT) && - QTD_CERR(token) == 0 && - ++qh->xacterrs < QH_XACTERR_MAX && - !urb->unlinked) { - fotg210_dbg(fotg210, - "detected XactErr len %zu/%zu retry %d\n", - qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs); - - /* reset the token in the qtd and the - * qh overlay (which still contains - * the qtd) so that we pick up from - * where we left off - */ - token &= ~QTD_STS_HALT; - token |= QTD_STS_ACTIVE | - (FOTG210_TUNE_CERR << 10); - qtd->hw_token = cpu_to_hc32(fotg210, - token); - wmb(); - hw->hw_token = cpu_to_hc32(fotg210, - token); - goto retry_xacterr; - } - stopped = 1; - - /* magic dummy for some short reads; qh won't advance. - * that silicon quirk can kick in with this dummy too. - * - * other short reads won't stop the queue, including - * control transfers (status stage handles that) or - * most other single-qtd reads ... the queue stops if - * URB_SHORT_NOT_OK was set so the driver submitting - * the urbs could clean it up. - */ - } else if (IS_SHORT_READ(token) - && !(qtd->hw_alt_next - & FOTG210_LIST_END(fotg210))) { - stopped = 1; - } - - /* stop scanning when we reach qtds the hc is using */ - } else if (likely(!stopped - && fotg210->rh_state >= FOTG210_RH_RUNNING)) { - break; - - /* scan the whole queue for unlinks whenever it stops */ - } else { - stopped = 1; - - /* cancel everything if we halt, suspend, etc */ - if (fotg210->rh_state < FOTG210_RH_RUNNING) - last_status = -ESHUTDOWN; - - /* this qtd is active; skip it unless a previous qtd - * for its urb faulted, or its urb was canceled. - */ - else if (last_status == -EINPROGRESS && !urb->unlinked) - continue; - - /* qh unlinked; token in overlay may be most current */ - if (state == QH_STATE_IDLE - && cpu_to_hc32(fotg210, qtd->qtd_dma) - == hw->hw_current) { - token = hc32_to_cpu(fotg210, hw->hw_token); - - /* An unlink may leave an incomplete - * async transaction in the TT buffer. - * We have to clear it. - */ - fotg210_clear_tt_buffer(fotg210, qh, urb, - token); - } - } - - /* unless we already know the urb's status, collect qtd status - * and update count of bytes transferred. in common short read - * cases with only one data qtd (including control transfers), - * queue processing won't halt. but with two or more qtds (for - * example, with a 32 KB transfer), when the first qtd gets a - * short read the second must be removed by hand. - */ - if (last_status == -EINPROGRESS) { - last_status = qtd_copy_status(fotg210, urb, - qtd->length, token); - if (last_status == -EREMOTEIO - && (qtd->hw_alt_next - & FOTG210_LIST_END(fotg210))) - last_status = -EINPROGRESS; - - /* As part of low/full-speed endpoint-halt processing - * we must clear the TT buffer (11.17.5). - */ - if (unlikely(last_status != -EINPROGRESS && - last_status != -EREMOTEIO)) { - /* The TT's in some hubs malfunction when they - * receive this request following a STALL (they - * stop sending isochronous packets). Since a - * STALL can't leave the TT buffer in a busy - * state (if you believe Figures 11-48 - 11-51 - * in the USB 2.0 spec), we won't clear the TT - * buffer in this case. Strictly speaking this - * is a violation of the spec. - */ - if (last_status != -EPIPE) - fotg210_clear_tt_buffer(fotg210, qh, - urb, token); - } - } - - /* if we're removing something not at the queue head, - * patch the hardware queue pointer. - */ - if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { - last = list_entry(qtd->qtd_list.prev, - struct fotg210_qtd, qtd_list); - last->hw_next = qtd->hw_next; - } - - /* remove qtd; it's recycled after possible urb completion */ - list_del(&qtd->qtd_list); - last = qtd; - - /* reinit the xacterr counter for the next qtd */ - qh->xacterrs = 0; - } - - /* last urb's completion might still need calling */ - if (likely(last != NULL)) { - fotg210_urb_done(fotg210, last->urb, last_status); - count++; - fotg210_qtd_free(fotg210, last); - } - - /* Do we need to rescan for URBs dequeued during a giveback? */ - if (unlikely(qh->needs_rescan)) { - /* If the QH is already unlinked, do the rescan now. */ - if (state == QH_STATE_IDLE) - goto rescan; - - /* Otherwise we have to wait until the QH is fully unlinked. - * Our caller will start an unlink if qh->needs_rescan is - * set. But if an unlink has already started, nothing needs - * to be done. - */ - if (state != QH_STATE_LINKED) - qh->needs_rescan = 0; - } - - /* restore original state; caller must unlink or relink */ - qh->qh_state = state; - - /* be sure the hardware's done with the qh before refreshing - * it after fault cleanup, or recovering from silicon wrongly - * overlaying the dummy qtd (which reduces DMA chatter). - */ - if (stopped != 0 || hw->hw_qtd_next == FOTG210_LIST_END(fotg210)) { - switch (state) { - case QH_STATE_IDLE: - qh_refresh(fotg210, qh); - break; - case QH_STATE_LINKED: - /* We won't refresh a QH that's linked (after the HC - * stopped the queue). That avoids a race: - * - HC reads first part of QH; - * - CPU updates that first part and the token; - * - HC reads rest of that QH, including token - * Result: HC gets an inconsistent image, and then - * DMAs to/from the wrong memory (corrupting it). - * - * That should be rare for interrupt transfers, - * except maybe high bandwidth ... - */ - - /* Tell the caller to start an unlink */ - qh->needs_rescan = 1; - break; - /* otherwise, unlink already started */ - } - } - - return count; -} - -/*-------------------------------------------------------------------------*/ - -/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ -#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) -/* ... and packet size, for any kind of endpoint descriptor */ -#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) - -/* - * reverse of qh_urb_transaction: free a list of TDs. - * used for cleanup after errors, before HC sees an URB's TDs. - */ -static void qtd_list_free( - struct fotg210_hcd *fotg210, - struct urb *urb, - struct list_head *qtd_list -) { - struct list_head *entry, *temp; - - list_for_each_safe(entry, temp, qtd_list) { - struct fotg210_qtd *qtd; - - qtd = list_entry(entry, struct fotg210_qtd, qtd_list); - list_del(&qtd->qtd_list); - fotg210_qtd_free(fotg210, qtd); - } -} - -/* - * create a list of filled qtds for this URB; won't link into qh. - */ -static struct list_head * -qh_urb_transaction( - struct fotg210_hcd *fotg210, - struct urb *urb, - struct list_head *head, - gfp_t flags -) { - struct fotg210_qtd *qtd, *qtd_prev; - dma_addr_t buf; - int len, this_sg_len, maxpacket; - int is_input; - u32 token; - int i; - struct scatterlist *sg; - - /* - * URBs map to sequences of QTDs: one logical transaction - */ - qtd = fotg210_qtd_alloc(fotg210, flags); - if (unlikely(!qtd)) - return NULL; - list_add_tail(&qtd->qtd_list, head); - qtd->urb = urb; - - token = QTD_STS_ACTIVE; - token |= (FOTG210_TUNE_CERR << 10); - /* for split transactions, SplitXState initialized to zero */ - - len = urb->transfer_buffer_length; - is_input = usb_pipein(urb->pipe); - if (usb_pipecontrol(urb->pipe)) { - /* SETUP pid */ - qtd_fill(fotg210, qtd, urb->setup_dma, - sizeof(struct usb_ctrlrequest), - token | (2 /* "setup" */ << 8), 8); - - /* ... and always at least one more pid */ - token ^= QTD_TOGGLE; - qtd_prev = qtd; - qtd = fotg210_qtd_alloc(fotg210, flags); - if (unlikely(!qtd)) - goto cleanup; - qtd->urb = urb; - qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); - list_add_tail(&qtd->qtd_list, head); - - /* for zero length DATA stages, STATUS is always IN */ - if (len == 0) - token |= (1 /* "in" */ << 8); - } - - /* - * data transfer stage: buffer setup - */ - i = urb->num_mapped_sgs; - if (len > 0 && i > 0) { - sg = urb->sg; - buf = sg_dma_address(sg); - - /* urb->transfer_buffer_length may be smaller than the - * size of the scatterlist (or vice versa) - */ - this_sg_len = min_t(int, sg_dma_len(sg), len); - } else { - sg = NULL; - buf = urb->transfer_dma; - this_sg_len = len; - } - - if (is_input) - token |= (1 /* "in" */ << 8); - /* else it's already initted to "out" pid (0 << 8) */ - - maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); - - /* - * buffer gets wrapped in one or more qtds; - * last one may be "short" (including zero len) - * and may serve as a control status ack - */ - for (;;) { - int this_qtd_len; - - this_qtd_len = qtd_fill(fotg210, qtd, buf, this_sg_len, token, - maxpacket); - this_sg_len -= this_qtd_len; - len -= this_qtd_len; - buf += this_qtd_len; - - /* - * short reads advance to a "magic" dummy instead of the next - * qtd ... that forces the queue to stop, for manual cleanup. - * (this will usually be overridden later.) - */ - if (is_input) - qtd->hw_alt_next = fotg210->async->hw->hw_alt_next; - - /* qh makes control packets use qtd toggle; maybe switch it */ - if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) - token ^= QTD_TOGGLE; - - if (likely(this_sg_len <= 0)) { - if (--i <= 0 || len <= 0) - break; - sg = sg_next(sg); - buf = sg_dma_address(sg); - this_sg_len = min_t(int, sg_dma_len(sg), len); - } - - qtd_prev = qtd; - qtd = fotg210_qtd_alloc(fotg210, flags); - if (unlikely(!qtd)) - goto cleanup; - qtd->urb = urb; - qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); - list_add_tail(&qtd->qtd_list, head); - } - - /* - * unless the caller requires manual cleanup after short reads, - * have the alt_next mechanism keep the queue running after the - * last data qtd (the only one, for control and most other cases). - */ - if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 - || usb_pipecontrol(urb->pipe))) - qtd->hw_alt_next = FOTG210_LIST_END(fotg210); - - /* - * control requests may need a terminating data "status" ack; - * other OUT ones may need a terminating short packet - * (zero length). - */ - if (likely(urb->transfer_buffer_length != 0)) { - int one_more = 0; - - if (usb_pipecontrol(urb->pipe)) { - one_more = 1; - token ^= 0x0100; /* "in" <--> "out" */ - token |= QTD_TOGGLE; /* force DATA1 */ - } else if (usb_pipeout(urb->pipe) - && (urb->transfer_flags & URB_ZERO_PACKET) - && !(urb->transfer_buffer_length % maxpacket)) { - one_more = 1; - } - if (one_more) { - qtd_prev = qtd; - qtd = fotg210_qtd_alloc(fotg210, flags); - if (unlikely(!qtd)) - goto cleanup; - qtd->urb = urb; - qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma); - list_add_tail(&qtd->qtd_list, head); - - /* never any data in such packets */ - qtd_fill(fotg210, qtd, 0, 0, token, 0); - } - } - - /* by default, enable interrupt on urb completion */ - if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT))) - qtd->hw_token |= cpu_to_hc32(fotg210, QTD_IOC); - return head; - -cleanup: - qtd_list_free(fotg210, urb, head); - return NULL; -} - -/*-------------------------------------------------------------------------*/ -/* - * Would be best to create all qh's from config descriptors, - * when each interface/altsetting is established. Unlink - * any previous qh and cancel its urbs first; endpoints are - * implicitly reset then (data toggle too). - * That'd mean updating how usbcore talks to HCDs. (2.7?) -*/ - - -/* - * Each QH holds a qtd list; a QH is used for everything except iso. - * - * For interrupt urbs, the scheduler must set the microframe scheduling - * mask(s) each time the QH gets scheduled. For highspeed, that's - * just one microframe in the s-mask. For split interrupt transactions - * there are additional complications: c-mask, maybe FSTNs. - */ -static struct fotg210_qh * -qh_make( - struct fotg210_hcd *fotg210, - struct urb *urb, - gfp_t flags -) { - struct fotg210_qh *qh = fotg210_qh_alloc(fotg210, flags); - u32 info1 = 0, info2 = 0; - int is_input, type; - int maxp = 0; - struct usb_tt *tt = urb->dev->tt; - struct fotg210_qh_hw *hw; - - if (!qh) - return qh; - - /* - * init endpoint/device data for this QH - */ - info1 |= usb_pipeendpoint(urb->pipe) << 8; - info1 |= usb_pipedevice(urb->pipe) << 0; - - is_input = usb_pipein(urb->pipe); - type = usb_pipetype(urb->pipe); - maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input); - - /* 1024 byte maxpacket is a hardware ceiling. High bandwidth - * acts like up to 3KB, but is built from smaller packets. - */ - if (max_packet(maxp) > 1024) { - fotg210_dbg(fotg210, "bogus qh maxpacket %d\n", - max_packet(maxp)); - goto done; - } - - /* Compute interrupt scheduling parameters just once, and save. - * - allowing for high bandwidth, how many nsec/uframe are used? - * - split transactions need a second CSPLIT uframe; same question - * - splits also need a schedule gap (for full/low speed I/O) - * - qh has a polling interval - * - * For control/bulk requests, the HC or TT handles these. - */ - if (type == PIPE_INTERRUPT) { - qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH, - is_input, 0, - hb_mult(maxp) * max_packet(maxp))); - qh->start = NO_FRAME; - - if (urb->dev->speed == USB_SPEED_HIGH) { - qh->c_usecs = 0; - qh->gap_uf = 0; - - qh->period = urb->interval >> 3; - if (qh->period == 0 && urb->interval != 1) { - /* NOTE interval 2 or 4 uframes could work. - * But interval 1 scheduling is simpler, and - * includes high bandwidth. - */ - urb->interval = 1; - } else if (qh->period > fotg210->periodic_size) { - qh->period = fotg210->periodic_size; - urb->interval = qh->period << 3; - } - } else { - int think_time; - - /* gap is f(FS/LS transfer times) */ - qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed, - is_input, 0, maxp) / (125 * 1000); - - /* FIXME this just approximates SPLIT/CSPLIT times */ - if (is_input) { /* SPLIT, gap, CSPLIT+DATA */ - qh->c_usecs = qh->usecs + HS_USECS(0); - qh->usecs = HS_USECS(1); - } else { /* SPLIT+DATA, gap, CSPLIT */ - qh->usecs += HS_USECS(1); - qh->c_usecs = HS_USECS(0); - } - - think_time = tt ? tt->think_time : 0; - qh->tt_usecs = NS_TO_US(think_time + - usb_calc_bus_time(urb->dev->speed, - is_input, 0, max_packet(maxp))); - qh->period = urb->interval; - if (qh->period > fotg210->periodic_size) { - qh->period = fotg210->periodic_size; - urb->interval = qh->period; - } - } - } - - /* support for tt scheduling, and access to toggles */ - qh->dev = urb->dev; - - /* using TT? */ - switch (urb->dev->speed) { - case USB_SPEED_LOW: - info1 |= QH_LOW_SPEED; - /* FALL THROUGH */ - - case USB_SPEED_FULL: - /* EPS 0 means "full" */ - if (type != PIPE_INTERRUPT) - info1 |= (FOTG210_TUNE_RL_TT << 28); - if (type == PIPE_CONTROL) { - info1 |= QH_CONTROL_EP; /* for TT */ - info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ - } - info1 |= maxp << 16; - - info2 |= (FOTG210_TUNE_MULT_TT << 30); - - /* Some Freescale processors have an erratum in which the - * port number in the queue head was 0..N-1 instead of 1..N. - */ - if (fotg210_has_fsl_portno_bug(fotg210)) - info2 |= (urb->dev->ttport-1) << 23; - else - info2 |= urb->dev->ttport << 23; - - /* set the address of the TT; for TDI's integrated - * root hub tt, leave it zeroed. - */ - if (tt && tt->hub != fotg210_to_hcd(fotg210)->self.root_hub) - info2 |= tt->hub->devnum << 16; - - /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ - - break; - - case USB_SPEED_HIGH: /* no TT involved */ - info1 |= QH_HIGH_SPEED; - if (type == PIPE_CONTROL) { - info1 |= (FOTG210_TUNE_RL_HS << 28); - info1 |= 64 << 16; /* usb2 fixed maxpacket */ - info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ - info2 |= (FOTG210_TUNE_MULT_HS << 30); - } else if (type == PIPE_BULK) { - info1 |= (FOTG210_TUNE_RL_HS << 28); - /* The USB spec says that high speed bulk endpoints - * always use 512 byte maxpacket. But some device - * vendors decided to ignore that, and MSFT is happy - * to help them do so. So now people expect to use - * such nonconformant devices with Linux too; sigh. - */ - info1 |= max_packet(maxp) << 16; - info2 |= (FOTG210_TUNE_MULT_HS << 30); - } else { /* PIPE_INTERRUPT */ - info1 |= max_packet(maxp) << 16; - info2 |= hb_mult(maxp) << 30; - } - break; - default: - fotg210_dbg(fotg210, "bogus dev %p speed %d\n", urb->dev, - urb->dev->speed); -done: - qh_destroy(fotg210, qh); - return NULL; - } - - /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ - - /* init as live, toggle clear, advance to dummy */ - qh->qh_state = QH_STATE_IDLE; - hw = qh->hw; - hw->hw_info1 = cpu_to_hc32(fotg210, info1); - hw->hw_info2 = cpu_to_hc32(fotg210, info2); - qh->is_out = !is_input; - usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1); - qh_refresh(fotg210, qh); - return qh; -} - -/*-------------------------------------------------------------------------*/ - -static void enable_async(struct fotg210_hcd *fotg210) -{ - if (fotg210->async_count++) - return; - - /* Stop waiting to turn off the async schedule */ - fotg210->enabled_hrtimer_events &= ~BIT(FOTG210_HRTIMER_DISABLE_ASYNC); - - /* Don't start the schedule until ASS is 0 */ - fotg210_poll_ASS(fotg210); - turn_on_io_watchdog(fotg210); -} - -static void disable_async(struct fotg210_hcd *fotg210) -{ - if (--fotg210->async_count) - return; - - /* The async schedule and async_unlink list are supposed to be empty */ - WARN_ON(fotg210->async->qh_next.qh || fotg210->async_unlink); - - /* Don't turn off the schedule until ASS is 1 */ - fotg210_poll_ASS(fotg210); -} - -/* move qh (and its qtds) onto async queue; maybe enable queue. */ - -static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - __hc32 dma = QH_NEXT(fotg210, qh->qh_dma); - struct fotg210_qh *head; - - /* Don't link a QH if there's a Clear-TT-Buffer pending */ - if (unlikely(qh->clearing_tt)) - return; - - WARN_ON(qh->qh_state != QH_STATE_IDLE); - - /* clear halt and/or toggle; and maybe recover from silicon quirk */ - qh_refresh(fotg210, qh); - - /* splice right after start */ - head = fotg210->async; - qh->qh_next = head->qh_next; - qh->hw->hw_next = head->hw->hw_next; - wmb(); - - head->qh_next.qh = qh; - head->hw->hw_next = dma; - - qh->xacterrs = 0; - qh->qh_state = QH_STATE_LINKED; - /* qtd completions reported later by interrupt */ - - enable_async(fotg210); -} - -/*-------------------------------------------------------------------------*/ - -/* - * For control/bulk/interrupt, return QH with these TDs appended. - * Allocates and initializes the QH if necessary. - * Returns null if it can't allocate a QH it needs to. - * If the QH has TDs (urbs) already, that's great. - */ -static struct fotg210_qh *qh_append_tds( - struct fotg210_hcd *fotg210, - struct urb *urb, - struct list_head *qtd_list, - int epnum, - void **ptr -) -{ - struct fotg210_qh *qh = NULL; - __hc32 qh_addr_mask = cpu_to_hc32(fotg210, 0x7f); - - qh = (struct fotg210_qh *) *ptr; - if (unlikely(qh == NULL)) { - /* can't sleep here, we have fotg210->lock... */ - qh = qh_make(fotg210, urb, GFP_ATOMIC); - *ptr = qh; - } - if (likely(qh != NULL)) { - struct fotg210_qtd *qtd; - - if (unlikely(list_empty(qtd_list))) - qtd = NULL; - else - qtd = list_entry(qtd_list->next, struct fotg210_qtd, - qtd_list); - - /* control qh may need patching ... */ - if (unlikely(epnum == 0)) { - /* usb_reset_device() briefly reverts to address 0 */ - if (usb_pipedevice(urb->pipe) == 0) - qh->hw->hw_info1 &= ~qh_addr_mask; - } - - /* just one way to queue requests: swap with the dummy qtd. - * only hc or qh_refresh() ever modify the overlay. - */ - if (likely(qtd != NULL)) { - struct fotg210_qtd *dummy; - dma_addr_t dma; - __hc32 token; - - /* to avoid racing the HC, use the dummy td instead of - * the first td of our list (becomes new dummy). both - * tds stay deactivated until we're done, when the - * HC is allowed to fetch the old dummy (4.10.2). - */ - token = qtd->hw_token; - qtd->hw_token = HALT_BIT(fotg210); - - dummy = qh->dummy; - - dma = dummy->qtd_dma; - *dummy = *qtd; - dummy->qtd_dma = dma; - - list_del(&qtd->qtd_list); - list_add(&dummy->qtd_list, qtd_list); - list_splice_tail(qtd_list, &qh->qtd_list); - - fotg210_qtd_init(fotg210, qtd, qtd->qtd_dma); - qh->dummy = qtd; - - /* hc must see the new dummy at list end */ - dma = qtd->qtd_dma; - qtd = list_entry(qh->qtd_list.prev, - struct fotg210_qtd, qtd_list); - qtd->hw_next = QTD_NEXT(fotg210, dma); - - /* let the hc process these next qtds */ - wmb(); - dummy->hw_token = token; - - urb->hcpriv = qh; - } - } - return qh; -} - -/*-------------------------------------------------------------------------*/ - -static int -submit_async( - struct fotg210_hcd *fotg210, - struct urb *urb, - struct list_head *qtd_list, - gfp_t mem_flags -) { - int epnum; - unsigned long flags; - struct fotg210_qh *qh = NULL; - int rc; - - epnum = urb->ep->desc.bEndpointAddress; - -#ifdef FOTG210_URB_TRACE - { - struct fotg210_qtd *qtd; - qtd = list_entry(qtd_list->next, struct fotg210_qtd, qtd_list); - fotg210_dbg(fotg210, - "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", - __func__, urb->dev->devpath, urb, - epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", - urb->transfer_buffer_length, - qtd, urb->ep->hcpriv); - } -#endif - - spin_lock_irqsave(&fotg210->lock, flags); - if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { - rc = -ESHUTDOWN; - goto done; - } - rc = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); - if (unlikely(rc)) - goto done; - - qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv); - if (unlikely(qh == NULL)) { - usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); - rc = -ENOMEM; - goto done; - } - - /* Control/bulk operations through TTs don't need scheduling, - * the HC and TT handle it when the TT has a buffer ready. - */ - if (likely(qh->qh_state == QH_STATE_IDLE)) - qh_link_async(fotg210, qh); - done: - spin_unlock_irqrestore(&fotg210->lock, flags); - if (unlikely(qh == NULL)) - qtd_list_free(fotg210, urb, qtd_list); - return rc; -} - -/*-------------------------------------------------------------------------*/ - -static void single_unlink_async(struct fotg210_hcd *fotg210, - struct fotg210_qh *qh) -{ - struct fotg210_qh *prev; - - /* Add to the end of the list of QHs waiting for the next IAAD */ - qh->qh_state = QH_STATE_UNLINK; - if (fotg210->async_unlink) - fotg210->async_unlink_last->unlink_next = qh; - else - fotg210->async_unlink = qh; - fotg210->async_unlink_last = qh; - - /* Unlink it from the schedule */ - prev = fotg210->async; - while (prev->qh_next.qh != qh) - prev = prev->qh_next.qh; - - prev->hw->hw_next = qh->hw->hw_next; - prev->qh_next = qh->qh_next; - if (fotg210->qh_scan_next == qh) - fotg210->qh_scan_next = qh->qh_next.qh; -} - -static void start_iaa_cycle(struct fotg210_hcd *fotg210, bool nested) -{ - /* - * Do nothing if an IAA cycle is already running or - * if one will be started shortly. - */ - if (fotg210->async_iaa || fotg210->async_unlinking) - return; - - /* Do all the waiting QHs at once */ - fotg210->async_iaa = fotg210->async_unlink; - fotg210->async_unlink = NULL; - - /* If the controller isn't running, we don't have to wait for it */ - if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) { - if (!nested) /* Avoid recursion */ - end_unlink_async(fotg210); - - /* Otherwise start a new IAA cycle */ - } else if (likely(fotg210->rh_state == FOTG210_RH_RUNNING)) { - /* Make sure the unlinks are all visible to the hardware */ - wmb(); - - fotg210_writel(fotg210, fotg210->command | CMD_IAAD, - &fotg210->regs->command); - fotg210_readl(fotg210, &fotg210->regs->command); - fotg210_enable_event(fotg210, FOTG210_HRTIMER_IAA_WATCHDOG, - true); - } -} - -/* the async qh for the qtds being unlinked are now gone from the HC */ - -static void end_unlink_async(struct fotg210_hcd *fotg210) -{ - struct fotg210_qh *qh; - - /* Process the idle QHs */ - restart: - fotg210->async_unlinking = true; - while (fotg210->async_iaa) { - qh = fotg210->async_iaa; - fotg210->async_iaa = qh->unlink_next; - qh->unlink_next = NULL; - - qh->qh_state = QH_STATE_IDLE; - qh->qh_next.qh = NULL; - - qh_completions(fotg210, qh); - if (!list_empty(&qh->qtd_list) && - fotg210->rh_state == FOTG210_RH_RUNNING) - qh_link_async(fotg210, qh); - disable_async(fotg210); - } - fotg210->async_unlinking = false; - - /* Start a new IAA cycle if any QHs are waiting for it */ - if (fotg210->async_unlink) { - start_iaa_cycle(fotg210, true); - if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) - goto restart; - } -} - -static void unlink_empty_async(struct fotg210_hcd *fotg210) -{ - struct fotg210_qh *qh, *next; - bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING); - bool check_unlinks_later = false; - - /* Unlink all the async QHs that have been empty for a timer cycle */ - next = fotg210->async->qh_next.qh; - while (next) { - qh = next; - next = qh->qh_next.qh; - - if (list_empty(&qh->qtd_list) && - qh->qh_state == QH_STATE_LINKED) { - if (!stopped && qh->unlink_cycle == - fotg210->async_unlink_cycle) - check_unlinks_later = true; - else - single_unlink_async(fotg210, qh); - } - } - - /* Start a new IAA cycle if any QHs are waiting for it */ - if (fotg210->async_unlink) - start_iaa_cycle(fotg210, false); - - /* QHs that haven't been empty for long enough will be handled later */ - if (check_unlinks_later) { - fotg210_enable_event(fotg210, FOTG210_HRTIMER_ASYNC_UNLINKS, - true); - ++fotg210->async_unlink_cycle; - } -} - -/* makes sure the async qh will become idle */ -/* caller must own fotg210->lock */ - -static void start_unlink_async(struct fotg210_hcd *fotg210, - struct fotg210_qh *qh) -{ - /* - * If the QH isn't linked then there's nothing we can do - * unless we were called during a giveback, in which case - * qh_completions() has to deal with it. - */ - if (qh->qh_state != QH_STATE_LINKED) { - if (qh->qh_state == QH_STATE_COMPLETING) - qh->needs_rescan = 1; - return; - } - - single_unlink_async(fotg210, qh); - start_iaa_cycle(fotg210, false); -} - -/*-------------------------------------------------------------------------*/ - -static void scan_async(struct fotg210_hcd *fotg210) -{ - struct fotg210_qh *qh; - bool check_unlinks_later = false; - - fotg210->qh_scan_next = fotg210->async->qh_next.qh; - while (fotg210->qh_scan_next) { - qh = fotg210->qh_scan_next; - fotg210->qh_scan_next = qh->qh_next.qh; - rescan: - /* clean any finished work for this qh */ - if (!list_empty(&qh->qtd_list)) { - int temp; - - /* - * Unlinks could happen here; completion reporting - * drops the lock. That's why fotg210->qh_scan_next - * always holds the next qh to scan; if the next qh - * gets unlinked then fotg210->qh_scan_next is adjusted - * in single_unlink_async(). - */ - temp = qh_completions(fotg210, qh); - if (qh->needs_rescan) { - start_unlink_async(fotg210, qh); - } else if (list_empty(&qh->qtd_list) - && qh->qh_state == QH_STATE_LINKED) { - qh->unlink_cycle = fotg210->async_unlink_cycle; - check_unlinks_later = true; - } else if (temp != 0) - goto rescan; - } - } - - /* - * Unlink empty entries, reducing DMA usage as well - * as HCD schedule-scanning costs. Delay for any qh - * we just scanned, there's a not-unusual case that it - * doesn't stay idle for long. - */ - if (check_unlinks_later && fotg210->rh_state == FOTG210_RH_RUNNING && - !(fotg210->enabled_hrtimer_events & - BIT(FOTG210_HRTIMER_ASYNC_UNLINKS))) { - fotg210_enable_event(fotg210, - FOTG210_HRTIMER_ASYNC_UNLINKS, true); - ++fotg210->async_unlink_cycle; - } -} -/*-------------------------------------------------------------------------*/ -/* - * EHCI scheduled transaction support: interrupt, iso, split iso - * These are called "periodic" transactions in the EHCI spec. - * - * Note that for interrupt transfers, the QH/QTD manipulation is shared - * with the "asynchronous" transaction support (control/bulk transfers). - * The only real difference is in how interrupt transfers are scheduled. - * - * For ISO, we make an "iso_stream" head to serve the same role as a QH. - * It keeps track of every ITD (or SITD) that's linked, and holds enough - * pre-calculated schedule data to make appending to the queue be quick. - */ - -static int fotg210_get_frame(struct usb_hcd *hcd); - -/*-------------------------------------------------------------------------*/ - -/* - * periodic_next_shadow - return "next" pointer on shadow list - * @periodic: host pointer to qh/itd - * @tag: hardware tag for type of this record - */ -static union fotg210_shadow * -periodic_next_shadow(struct fotg210_hcd *fotg210, - union fotg210_shadow *periodic, __hc32 tag) -{ - switch (hc32_to_cpu(fotg210, tag)) { - case Q_TYPE_QH: - return &periodic->qh->qh_next; - case Q_TYPE_FSTN: - return &periodic->fstn->fstn_next; - default: - return &periodic->itd->itd_next; - } -} - -static __hc32 * -shadow_next_periodic(struct fotg210_hcd *fotg210, - union fotg210_shadow *periodic, __hc32 tag) -{ - switch (hc32_to_cpu(fotg210, tag)) { - /* our fotg210_shadow.qh is actually software part */ - case Q_TYPE_QH: - return &periodic->qh->hw->hw_next; - /* others are hw parts */ - default: - return periodic->hw_next; - } -} - -/* caller must hold fotg210->lock */ -static void periodic_unlink(struct fotg210_hcd *fotg210, unsigned frame, - void *ptr) -{ - union fotg210_shadow *prev_p = &fotg210->pshadow[frame]; - __hc32 *hw_p = &fotg210->periodic[frame]; - union fotg210_shadow here = *prev_p; - - /* find predecessor of "ptr"; hw and shadow lists are in sync */ - while (here.ptr && here.ptr != ptr) { - prev_p = periodic_next_shadow(fotg210, prev_p, - Q_NEXT_TYPE(fotg210, *hw_p)); - hw_p = shadow_next_periodic(fotg210, &here, - Q_NEXT_TYPE(fotg210, *hw_p)); - here = *prev_p; - } - /* an interrupt entry (at list end) could have been shared */ - if (!here.ptr) - return; - - /* update shadow and hardware lists ... the old "next" pointers - * from ptr may still be in use, the caller updates them. - */ - *prev_p = *periodic_next_shadow(fotg210, &here, - Q_NEXT_TYPE(fotg210, *hw_p)); - - *hw_p = *shadow_next_periodic(fotg210, &here, - Q_NEXT_TYPE(fotg210, *hw_p)); -} - -/* how many of the uframe's 125 usecs are allocated? */ -static unsigned short -periodic_usecs(struct fotg210_hcd *fotg210, unsigned frame, unsigned uframe) -{ - __hc32 *hw_p = &fotg210->periodic[frame]; - union fotg210_shadow *q = &fotg210->pshadow[frame]; - unsigned usecs = 0; - struct fotg210_qh_hw *hw; - - while (q->ptr) { - switch (hc32_to_cpu(fotg210, Q_NEXT_TYPE(fotg210, *hw_p))) { - case Q_TYPE_QH: - hw = q->qh->hw; - /* is it in the S-mask? */ - if (hw->hw_info2 & cpu_to_hc32(fotg210, 1 << uframe)) - usecs += q->qh->usecs; - /* ... or C-mask? */ - if (hw->hw_info2 & cpu_to_hc32(fotg210, - 1 << (8 + uframe))) - usecs += q->qh->c_usecs; - hw_p = &hw->hw_next; - q = &q->qh->qh_next; - break; - /* case Q_TYPE_FSTN: */ - default: - /* for "save place" FSTNs, count the relevant INTR - * bandwidth from the previous frame - */ - if (q->fstn->hw_prev != FOTG210_LIST_END(fotg210)) - fotg210_dbg(fotg210, "ignoring FSTN cost ...\n"); - - hw_p = &q->fstn->hw_next; - q = &q->fstn->fstn_next; - break; - case Q_TYPE_ITD: - if (q->itd->hw_transaction[uframe]) - usecs += q->itd->stream->usecs; - hw_p = &q->itd->hw_next; - q = &q->itd->itd_next; - break; - } - } -#ifdef DEBUG - if (usecs > fotg210->uframe_periodic_max) - fotg210_err(fotg210, "uframe %d sched overrun: %d usecs\n", - frame * 8 + uframe, usecs); -#endif - return usecs; -} - -/*-------------------------------------------------------------------------*/ - -static int same_tt(struct usb_device *dev1, struct usb_device *dev2) -{ - if (!dev1->tt || !dev2->tt) - return 0; - if (dev1->tt != dev2->tt) - return 0; - if (dev1->tt->multi) - return dev1->ttport == dev2->ttport; - else - return 1; -} - -/* return true iff the device's transaction translator is available - * for a periodic transfer starting at the specified frame, using - * all the uframes in the mask. - */ -static int tt_no_collision( - struct fotg210_hcd *fotg210, - unsigned period, - struct usb_device *dev, - unsigned frame, - u32 uf_mask -) -{ - if (period == 0) /* error */ - return 0; - - /* note bandwidth wastage: split never follows csplit - * (different dev or endpoint) until the next uframe. - * calling convention doesn't make that distinction. - */ - for (; frame < fotg210->periodic_size; frame += period) { - union fotg210_shadow here; - __hc32 type; - struct fotg210_qh_hw *hw; - - here = fotg210->pshadow[frame]; - type = Q_NEXT_TYPE(fotg210, fotg210->periodic[frame]); - while (here.ptr) { - switch (hc32_to_cpu(fotg210, type)) { - case Q_TYPE_ITD: - type = Q_NEXT_TYPE(fotg210, here.itd->hw_next); - here = here.itd->itd_next; - continue; - case Q_TYPE_QH: - hw = here.qh->hw; - if (same_tt(dev, here.qh->dev)) { - u32 mask; - - mask = hc32_to_cpu(fotg210, - hw->hw_info2); - /* "knows" no gap is needed */ - mask |= mask >> 8; - if (mask & uf_mask) - break; - } - type = Q_NEXT_TYPE(fotg210, hw->hw_next); - here = here.qh->qh_next; - continue; - /* case Q_TYPE_FSTN: */ - default: - fotg210_dbg(fotg210, - "periodic frame %d bogus type %d\n", - frame, type); - } - - /* collision or error */ - return 0; - } - } - - /* no collision */ - return 1; -} - -/*-------------------------------------------------------------------------*/ - -static void enable_periodic(struct fotg210_hcd *fotg210) -{ - if (fotg210->periodic_count++) - return; - - /* Stop waiting to turn off the periodic schedule */ - fotg210->enabled_hrtimer_events &= - ~BIT(FOTG210_HRTIMER_DISABLE_PERIODIC); - - /* Don't start the schedule until PSS is 0 */ - fotg210_poll_PSS(fotg210); - turn_on_io_watchdog(fotg210); -} - -static void disable_periodic(struct fotg210_hcd *fotg210) -{ - if (--fotg210->periodic_count) - return; - - /* Don't turn off the schedule until PSS is 1 */ - fotg210_poll_PSS(fotg210); -} - -/*-------------------------------------------------------------------------*/ - -/* periodic schedule slots have iso tds (normal or split) first, then a - * sparse tree for active interrupt transfers. - * - * this just links in a qh; caller guarantees uframe masks are set right. - * no FSTN support (yet; fotg210 0.96+) - */ -static void qh_link_periodic(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - unsigned i; - unsigned period = qh->period; - - dev_dbg(&qh->dev->dev, - "link qh%d-%04x/%p start %d [%d/%d us]\n", - period, hc32_to_cpup(fotg210, &qh->hw->hw_info2) - & (QH_CMASK | QH_SMASK), - qh, qh->start, qh->usecs, qh->c_usecs); - - /* high bandwidth, or otherwise every microframe */ - if (period == 0) - period = 1; - - for (i = qh->start; i < fotg210->periodic_size; i += period) { - union fotg210_shadow *prev = &fotg210->pshadow[i]; - __hc32 *hw_p = &fotg210->periodic[i]; - union fotg210_shadow here = *prev; - __hc32 type = 0; - - /* skip the iso nodes at list head */ - while (here.ptr) { - type = Q_NEXT_TYPE(fotg210, *hw_p); - if (type == cpu_to_hc32(fotg210, Q_TYPE_QH)) - break; - prev = periodic_next_shadow(fotg210, prev, type); - hw_p = shadow_next_periodic(fotg210, &here, type); - here = *prev; - } - - /* sorting each branch by period (slow-->fast) - * enables sharing interior tree nodes - */ - while (here.ptr && qh != here.qh) { - if (qh->period > here.qh->period) - break; - prev = &here.qh->qh_next; - hw_p = &here.qh->hw->hw_next; - here = *prev; - } - /* link in this qh, unless some earlier pass did that */ - if (qh != here.qh) { - qh->qh_next = here; - if (here.qh) - qh->hw->hw_next = *hw_p; - wmb(); - prev->qh = qh; - *hw_p = QH_NEXT(fotg210, qh->qh_dma); - } - } - qh->qh_state = QH_STATE_LINKED; - qh->xacterrs = 0; - - /* update per-qh bandwidth for usbfs */ - fotg210_to_hcd(fotg210)->self.bandwidth_allocated += qh->period - ? ((qh->usecs + qh->c_usecs) / qh->period) - : (qh->usecs * 8); - - list_add(&qh->intr_node, &fotg210->intr_qh_list); - - /* maybe enable periodic schedule processing */ - ++fotg210->intr_count; - enable_periodic(fotg210); -} - -static void qh_unlink_periodic(struct fotg210_hcd *fotg210, - struct fotg210_qh *qh) -{ - unsigned i; - unsigned period; - - /* - * If qh is for a low/full-speed device, simply unlinking it - * could interfere with an ongoing split transaction. To unlink - * it safely would require setting the QH_INACTIVATE bit and - * waiting at least one frame, as described in EHCI 4.12.2.5. - * - * We won't bother with any of this. Instead, we assume that the - * only reason for unlinking an interrupt QH while the current URB - * is still active is to dequeue all the URBs (flush the whole - * endpoint queue). - * - * If rebalancing the periodic schedule is ever implemented, this - * approach will no longer be valid. - */ - - /* high bandwidth, or otherwise part of every microframe */ - period = qh->period; - if (!period) - period = 1; - - for (i = qh->start; i < fotg210->periodic_size; i += period) - periodic_unlink(fotg210, i, qh); - - /* update per-qh bandwidth for usbfs */ - fotg210_to_hcd(fotg210)->self.bandwidth_allocated -= qh->period - ? ((qh->usecs + qh->c_usecs) / qh->period) - : (qh->usecs * 8); - - dev_dbg(&qh->dev->dev, - "unlink qh%d-%04x/%p start %d [%d/%d us]\n", - qh->period, - hc32_to_cpup(fotg210, &qh->hw->hw_info2) & - (QH_CMASK | QH_SMASK), qh, qh->start, qh->usecs, qh->c_usecs); - - /* qh->qh_next still "live" to HC */ - qh->qh_state = QH_STATE_UNLINK; - qh->qh_next.ptr = NULL; - - if (fotg210->qh_scan_next == qh) - fotg210->qh_scan_next = list_entry(qh->intr_node.next, - struct fotg210_qh, intr_node); - list_del(&qh->intr_node); -} - -static void start_unlink_intr(struct fotg210_hcd *fotg210, - struct fotg210_qh *qh) -{ - /* If the QH isn't linked then there's nothing we can do - * unless we were called during a giveback, in which case - * qh_completions() has to deal with it. - */ - if (qh->qh_state != QH_STATE_LINKED) { - if (qh->qh_state == QH_STATE_COMPLETING) - qh->needs_rescan = 1; - return; - } - - qh_unlink_periodic(fotg210, qh); - - /* Make sure the unlinks are visible before starting the timer */ - wmb(); - - /* - * The EHCI spec doesn't say how long it takes the controller to - * stop accessing an unlinked interrupt QH. The timer delay is - * 9 uframes; presumably that will be long enough. - */ - qh->unlink_cycle = fotg210->intr_unlink_cycle; - - /* New entries go at the end of the intr_unlink list */ - if (fotg210->intr_unlink) - fotg210->intr_unlink_last->unlink_next = qh; - else - fotg210->intr_unlink = qh; - fotg210->intr_unlink_last = qh; - - if (fotg210->intr_unlinking) - ; /* Avoid recursive calls */ - else if (fotg210->rh_state < FOTG210_RH_RUNNING) - fotg210_handle_intr_unlinks(fotg210); - else if (fotg210->intr_unlink == qh) { - fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR, - true); - ++fotg210->intr_unlink_cycle; - } -} - -static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - struct fotg210_qh_hw *hw = qh->hw; - int rc; - - qh->qh_state = QH_STATE_IDLE; - hw->hw_next = FOTG210_LIST_END(fotg210); - - qh_completions(fotg210, qh); - - /* reschedule QH iff another request is queued */ - if (!list_empty(&qh->qtd_list) && - fotg210->rh_state == FOTG210_RH_RUNNING) { - rc = qh_schedule(fotg210, qh); - - /* An error here likely indicates handshake failure - * or no space left in the schedule. Neither fault - * should happen often ... - * - * FIXME kill the now-dysfunctional queued urbs - */ - if (rc != 0) - fotg210_err(fotg210, "can't reschedule qh %p, err %d\n", - qh, rc); - } - - /* maybe turn off periodic schedule */ - --fotg210->intr_count; - disable_periodic(fotg210); -} - -/*-------------------------------------------------------------------------*/ - -static int check_period( - struct fotg210_hcd *fotg210, - unsigned frame, - unsigned uframe, - unsigned period, - unsigned usecs -) { - int claimed; - - /* complete split running into next frame? - * given FSTN support, we could sometimes check... - */ - if (uframe >= 8) - return 0; - - /* convert "usecs we need" to "max already claimed" */ - usecs = fotg210->uframe_periodic_max - usecs; - - /* we "know" 2 and 4 uframe intervals were rejected; so - * for period 0, check _every_ microframe in the schedule. - */ - if (unlikely(period == 0)) { - do { - for (uframe = 0; uframe < 7; uframe++) { - claimed = periodic_usecs(fotg210, frame, - uframe); - if (claimed > usecs) - return 0; - } - } while ((frame += 1) < fotg210->periodic_size); - - /* just check the specified uframe, at that period */ - } else { - do { - claimed = periodic_usecs(fotg210, frame, uframe); - if (claimed > usecs) - return 0; - } while ((frame += period) < fotg210->periodic_size); - } - - /* success! */ - return 1; -} - -static int check_intr_schedule( - struct fotg210_hcd *fotg210, - unsigned frame, - unsigned uframe, - const struct fotg210_qh *qh, - __hc32 *c_maskp -) -{ - int retval = -ENOSPC; - u8 mask = 0; - - if (qh->c_usecs && uframe >= 6) /* FSTN territory? */ - goto done; - - if (!check_period(fotg210, frame, uframe, qh->period, qh->usecs)) - goto done; - if (!qh->c_usecs) { - retval = 0; - *c_maskp = 0; - goto done; - } - - /* Make sure this tt's buffer is also available for CSPLITs. - * We pessimize a bit; probably the typical full speed case - * doesn't need the second CSPLIT. - * - * NOTE: both SPLIT and CSPLIT could be checked in just - * one smart pass... - */ - mask = 0x03 << (uframe + qh->gap_uf); - *c_maskp = cpu_to_hc32(fotg210, mask << 8); - - mask |= 1 << uframe; - if (tt_no_collision(fotg210, qh->period, qh->dev, frame, mask)) { - if (!check_period(fotg210, frame, uframe + qh->gap_uf + 1, - qh->period, qh->c_usecs)) - goto done; - if (!check_period(fotg210, frame, uframe + qh->gap_uf, - qh->period, qh->c_usecs)) - goto done; - retval = 0; - } -done: - return retval; -} - -/* "first fit" scheduling policy used the first time through, - * or when the previous schedule slot can't be re-used. - */ -static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh) -{ - int status; - unsigned uframe; - __hc32 c_mask; - unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */ - struct fotg210_qh_hw *hw = qh->hw; - - qh_refresh(fotg210, qh); - hw->hw_next = FOTG210_LIST_END(fotg210); - frame = qh->start; - - /* reuse the previous schedule slots, if we can */ - if (frame < qh->period) { - uframe = ffs(hc32_to_cpup(fotg210, &hw->hw_info2) & QH_SMASK); - status = check_intr_schedule(fotg210, frame, --uframe, - qh, &c_mask); - } else { - uframe = 0; - c_mask = 0; - status = -ENOSPC; - } - - /* else scan the schedule to find a group of slots such that all - * uframes have enough periodic bandwidth available. - */ - if (status) { - /* "normal" case, uframing flexible except with splits */ - if (qh->period) { - int i; - - for (i = qh->period; status && i > 0; --i) { - frame = ++fotg210->random_frame % qh->period; - for (uframe = 0; uframe < 8; uframe++) { - status = check_intr_schedule(fotg210, - frame, uframe, qh, - &c_mask); - if (status == 0) - break; - } - } - - /* qh->period == 0 means every uframe */ - } else { - frame = 0; - status = check_intr_schedule(fotg210, 0, 0, qh, - &c_mask); - } - if (status) - goto done; - qh->start = frame; - - /* reset S-frame and (maybe) C-frame masks */ - hw->hw_info2 &= cpu_to_hc32(fotg210, ~(QH_CMASK | QH_SMASK)); - hw->hw_info2 |= qh->period - ? cpu_to_hc32(fotg210, 1 << uframe) - : cpu_to_hc32(fotg210, QH_SMASK); - hw->hw_info2 |= c_mask; - } else - fotg210_dbg(fotg210, "reused qh %p schedule\n", qh); - - /* stuff into the periodic schedule */ - qh_link_periodic(fotg210, qh); -done: - return status; -} - -static int intr_submit( - struct fotg210_hcd *fotg210, - struct urb *urb, - struct list_head *qtd_list, - gfp_t mem_flags -) { - unsigned epnum; - unsigned long flags; - struct fotg210_qh *qh; - int status; - struct list_head empty; - - /* get endpoint and transfer/schedule data */ - epnum = urb->ep->desc.bEndpointAddress; - - spin_lock_irqsave(&fotg210->lock, flags); - - if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { - status = -ESHUTDOWN; - goto done_not_linked; - } - status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); - if (unlikely(status)) - goto done_not_linked; - - /* get qh and force any scheduling errors */ - INIT_LIST_HEAD(&empty); - qh = qh_append_tds(fotg210, urb, &empty, epnum, &urb->ep->hcpriv); - if (qh == NULL) { - status = -ENOMEM; - goto done; - } - if (qh->qh_state == QH_STATE_IDLE) { - status = qh_schedule(fotg210, qh); - if (status) - goto done; - } - - /* then queue the urb's tds to the qh */ - qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv); - BUG_ON(qh == NULL); - - /* ... update usbfs periodic stats */ - fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs++; - -done: - if (unlikely(status)) - usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); -done_not_linked: - spin_unlock_irqrestore(&fotg210->lock, flags); - if (status) - qtd_list_free(fotg210, urb, qtd_list); - - return status; -} - -static void scan_intr(struct fotg210_hcd *fotg210) -{ - struct fotg210_qh *qh; - - list_for_each_entry_safe(qh, fotg210->qh_scan_next, - &fotg210->intr_qh_list, intr_node) { - rescan: - /* clean any finished work for this qh */ - if (!list_empty(&qh->qtd_list)) { - int temp; - - /* - * Unlinks could happen here; completion reporting - * drops the lock. That's why fotg210->qh_scan_next - * always holds the next qh to scan; if the next qh - * gets unlinked then fotg210->qh_scan_next is adjusted - * in qh_unlink_periodic(). - */ - temp = qh_completions(fotg210, qh); - if (unlikely(qh->needs_rescan || - (list_empty(&qh->qtd_list) && - qh->qh_state == QH_STATE_LINKED))) - start_unlink_intr(fotg210, qh); - else if (temp != 0) - goto rescan; - } - } -} - -/*-------------------------------------------------------------------------*/ - -/* fotg210_iso_stream ops work with both ITD and SITD */ - -static struct fotg210_iso_stream * -iso_stream_alloc(gfp_t mem_flags) -{ - struct fotg210_iso_stream *stream; - - stream = kzalloc(sizeof(*stream), mem_flags); - if (likely(stream != NULL)) { - INIT_LIST_HEAD(&stream->td_list); - INIT_LIST_HEAD(&stream->free_list); - stream->next_uframe = -1; - } - return stream; -} - -static void -iso_stream_init( - struct fotg210_hcd *fotg210, - struct fotg210_iso_stream *stream, - struct usb_device *dev, - int pipe, - unsigned interval -) -{ - u32 buf1; - unsigned epnum, maxp; - int is_input; - long bandwidth; - unsigned multi; - - /* - * this might be a "high bandwidth" highspeed endpoint, - * as encoded in the ep descriptor's wMaxPacket field - */ - epnum = usb_pipeendpoint(pipe); - is_input = usb_pipein(pipe) ? USB_DIR_IN : 0; - maxp = usb_maxpacket(dev, pipe, !is_input); - if (is_input) - buf1 = (1 << 11); - else - buf1 = 0; - - maxp = max_packet(maxp); - multi = hb_mult(maxp); - buf1 |= maxp; - maxp *= multi; - - stream->buf0 = cpu_to_hc32(fotg210, (epnum << 8) | dev->devnum); - stream->buf1 = cpu_to_hc32(fotg210, buf1); - stream->buf2 = cpu_to_hc32(fotg210, multi); - - /* usbfs wants to report the average usecs per frame tied up - * when transfers on this endpoint are scheduled ... - */ - if (dev->speed == USB_SPEED_FULL) { - interval <<= 3; - stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed, - is_input, 1, maxp)); - stream->usecs /= 8; - } else { - stream->highspeed = 1; - stream->usecs = HS_USECS_ISO(maxp); - } - bandwidth = stream->usecs * 8; - bandwidth /= interval; - - stream->bandwidth = bandwidth; - stream->udev = dev; - stream->bEndpointAddress = is_input | epnum; - stream->interval = interval; - stream->maxp = maxp; -} - -static struct fotg210_iso_stream * -iso_stream_find(struct fotg210_hcd *fotg210, struct urb *urb) -{ - unsigned epnum; - struct fotg210_iso_stream *stream; - struct usb_host_endpoint *ep; - unsigned long flags; - - epnum = usb_pipeendpoint(urb->pipe); - if (usb_pipein(urb->pipe)) - ep = urb->dev->ep_in[epnum]; - else - ep = urb->dev->ep_out[epnum]; - - spin_lock_irqsave(&fotg210->lock, flags); - stream = ep->hcpriv; - - if (unlikely(stream == NULL)) { - stream = iso_stream_alloc(GFP_ATOMIC); - if (likely(stream != NULL)) { - ep->hcpriv = stream; - stream->ep = ep; - iso_stream_init(fotg210, stream, urb->dev, urb->pipe, - urb->interval); - } - - /* if dev->ep[epnum] is a QH, hw is set */ - } else if (unlikely(stream->hw != NULL)) { - fotg210_dbg(fotg210, "dev %s ep%d%s, not iso??\n", - urb->dev->devpath, epnum, - usb_pipein(urb->pipe) ? "in" : "out"); - stream = NULL; - } - - spin_unlock_irqrestore(&fotg210->lock, flags); - return stream; -} - -/*-------------------------------------------------------------------------*/ - -/* fotg210_iso_sched ops can be ITD-only or SITD-only */ - -static struct fotg210_iso_sched * -iso_sched_alloc(unsigned packets, gfp_t mem_flags) -{ - struct fotg210_iso_sched *iso_sched; - int size = sizeof(*iso_sched); - - size += packets * sizeof(struct fotg210_iso_packet); - iso_sched = kzalloc(size, mem_flags); - if (likely(iso_sched != NULL)) - INIT_LIST_HEAD(&iso_sched->td_list); - - return iso_sched; -} - -static inline void -itd_sched_init( - struct fotg210_hcd *fotg210, - struct fotg210_iso_sched *iso_sched, - struct fotg210_iso_stream *stream, - struct urb *urb -) -{ - unsigned i; - dma_addr_t dma = urb->transfer_dma; - - /* how many uframes are needed for these transfers */ - iso_sched->span = urb->number_of_packets * stream->interval; - - /* figure out per-uframe itd fields that we'll need later - * when we fit new itds into the schedule. - */ - for (i = 0; i < urb->number_of_packets; i++) { - struct fotg210_iso_packet *uframe = &iso_sched->packet[i]; - unsigned length; - dma_addr_t buf; - u32 trans; - - length = urb->iso_frame_desc[i].length; - buf = dma + urb->iso_frame_desc[i].offset; - - trans = FOTG210_ISOC_ACTIVE; - trans |= buf & 0x0fff; - if (unlikely(((i + 1) == urb->number_of_packets)) - && !(urb->transfer_flags & URB_NO_INTERRUPT)) - trans |= FOTG210_ITD_IOC; - trans |= length << 16; - uframe->transaction = cpu_to_hc32(fotg210, trans); - - /* might need to cross a buffer page within a uframe */ - uframe->bufp = (buf & ~(u64)0x0fff); - buf += length; - if (unlikely((uframe->bufp != (buf & ~(u64)0x0fff)))) - uframe->cross = 1; - } -} - -static void -iso_sched_free( - struct fotg210_iso_stream *stream, - struct fotg210_iso_sched *iso_sched -) -{ - if (!iso_sched) - return; - /* caller must hold fotg210->lock!*/ - list_splice(&iso_sched->td_list, &stream->free_list); - kfree(iso_sched); -} - -static int -itd_urb_transaction( - struct fotg210_iso_stream *stream, - struct fotg210_hcd *fotg210, - struct urb *urb, - gfp_t mem_flags -) -{ - struct fotg210_itd *itd; - dma_addr_t itd_dma; - int i; - unsigned num_itds; - struct fotg210_iso_sched *sched; - unsigned long flags; - - sched = iso_sched_alloc(urb->number_of_packets, mem_flags); - if (unlikely(sched == NULL)) - return -ENOMEM; - - itd_sched_init(fotg210, sched, stream, urb); - - if (urb->interval < 8) - num_itds = 1 + (sched->span + 7) / 8; - else - num_itds = urb->number_of_packets; - - /* allocate/init ITDs */ - spin_lock_irqsave(&fotg210->lock, flags); - for (i = 0; i < num_itds; i++) { - - /* - * Use iTDs from the free list, but not iTDs that may - * still be in use by the hardware. - */ - if (likely(!list_empty(&stream->free_list))) { - itd = list_first_entry(&stream->free_list, - struct fotg210_itd, itd_list); - if (itd->frame == fotg210->now_frame) - goto alloc_itd; - list_del(&itd->itd_list); - itd_dma = itd->itd_dma; - } else { - alloc_itd: - spin_unlock_irqrestore(&fotg210->lock, flags); - itd = dma_pool_alloc(fotg210->itd_pool, mem_flags, - &itd_dma); - spin_lock_irqsave(&fotg210->lock, flags); - if (!itd) { - iso_sched_free(stream, sched); - spin_unlock_irqrestore(&fotg210->lock, flags); - return -ENOMEM; - } - } - - memset(itd, 0, sizeof(*itd)); - itd->itd_dma = itd_dma; - list_add(&itd->itd_list, &sched->td_list); - } - spin_unlock_irqrestore(&fotg210->lock, flags); - - /* temporarily store schedule info in hcpriv */ - urb->hcpriv = sched; - urb->error_count = 0; - return 0; -} - -/*-------------------------------------------------------------------------*/ - -static inline int -itd_slot_ok( - struct fotg210_hcd *fotg210, - u32 mod, - u32 uframe, - u8 usecs, - u32 period -) -{ - uframe %= period; - do { - /* can't commit more than uframe_periodic_max usec */ - if (periodic_usecs(fotg210, uframe >> 3, uframe & 0x7) - > (fotg210->uframe_periodic_max - usecs)) - return 0; - - /* we know urb->interval is 2^N uframes */ - uframe += period; - } while (uframe < mod); - return 1; -} - -/* - * This scheduler plans almost as far into the future as it has actual - * periodic schedule slots. (Affected by TUNE_FLS, which defaults to - * "as small as possible" to be cache-friendlier.) That limits the size - * transfers you can stream reliably; avoid more than 64 msec per urb. - * Also avoid queue depths of less than fotg210's worst irq latency (affected - * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter, - * and other factors); or more than about 230 msec total (for portability, - * given FOTG210_TUNE_FLS and the slop). Or, write a smarter scheduler! - */ - -#define SCHEDULE_SLOP 80 /* microframes */ - -static int -iso_stream_schedule( - struct fotg210_hcd *fotg210, - struct urb *urb, - struct fotg210_iso_stream *stream -) -{ - u32 now, next, start, period, span; - int status; - unsigned mod = fotg210->periodic_size << 3; - struct fotg210_iso_sched *sched = urb->hcpriv; - - period = urb->interval; - span = sched->span; - - if (span > mod - SCHEDULE_SLOP) { - fotg210_dbg(fotg210, "iso request %p too long\n", urb); - status = -EFBIG; - goto fail; - } - - now = fotg210_read_frame_index(fotg210) & (mod - 1); - - /* Typical case: reuse current schedule, stream is still active. - * Hopefully there are no gaps from the host falling behind - * (irq delays etc), but if there are we'll take the next - * slot in the schedule, implicitly assuming URB_ISO_ASAP. - */ - if (likely(!list_empty(&stream->td_list))) { - u32 excess; - - /* For high speed devices, allow scheduling within the - * isochronous scheduling threshold. For full speed devices - * and Intel PCI-based controllers, don't (work around for - * Intel ICH9 bug). - */ - if (!stream->highspeed && fotg210->fs_i_thresh) - next = now + fotg210->i_thresh; - else - next = now; - - /* Fell behind (by up to twice the slop amount)? - * We decide based on the time of the last currently-scheduled - * slot, not the time of the next available slot. - */ - excess = (stream->next_uframe - period - next) & (mod - 1); - if (excess >= mod - 2 * SCHEDULE_SLOP) - start = next + excess - mod + period * - DIV_ROUND_UP(mod - excess, period); - else - start = next + excess + period; - if (start - now >= mod) { - fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n", - urb, start - now - period, period, - mod); - status = -EFBIG; - goto fail; - } - } - - /* need to schedule; when's the next (u)frame we could start? - * this is bigger than fotg210->i_thresh allows; scheduling itself - * isn't free, the slop should handle reasonably slow cpus. it - * can also help high bandwidth if the dma and irq loads don't - * jump until after the queue is primed. - */ - else { - int done = 0; - start = SCHEDULE_SLOP + (now & ~0x07); - - /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */ - - /* find a uframe slot with enough bandwidth. - * Early uframes are more precious because full-speed - * iso IN transfers can't use late uframes, - * and therefore they should be allocated last. - */ - next = start; - start += period; - do { - start--; - /* check schedule: enough space? */ - if (itd_slot_ok(fotg210, mod, start, - stream->usecs, period)) - done = 1; - } while (start > next && !done); - - /* no room in the schedule */ - if (!done) { - fotg210_dbg(fotg210, "iso resched full %p (now %d max %d)\n", - urb, now, now + mod); - status = -ENOSPC; - goto fail; - } - } - - /* Tried to schedule too far into the future? */ - if (unlikely(start - now + span - period - >= mod - 2 * SCHEDULE_SLOP)) { - fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n", - urb, start - now, span - period, - mod - 2 * SCHEDULE_SLOP); - status = -EFBIG; - goto fail; - } - - stream->next_uframe = start & (mod - 1); - - /* report high speed start in uframes; full speed, in frames */ - urb->start_frame = stream->next_uframe; - if (!stream->highspeed) - urb->start_frame >>= 3; - - /* Make sure scan_isoc() sees these */ - if (fotg210->isoc_count == 0) - fotg210->next_frame = now >> 3; - return 0; - - fail: - iso_sched_free(stream, sched); - urb->hcpriv = NULL; - return status; -} - -/*-------------------------------------------------------------------------*/ - -static inline void -itd_init(struct fotg210_hcd *fotg210, struct fotg210_iso_stream *stream, - struct fotg210_itd *itd) -{ - int i; - - /* it's been recently zeroed */ - itd->hw_next = FOTG210_LIST_END(fotg210); - itd->hw_bufp[0] = stream->buf0; - itd->hw_bufp[1] = stream->buf1; - itd->hw_bufp[2] = stream->buf2; - - for (i = 0; i < 8; i++) - itd->index[i] = -1; - - /* All other fields are filled when scheduling */ -} - -static inline void -itd_patch( - struct fotg210_hcd *fotg210, - struct fotg210_itd *itd, - struct fotg210_iso_sched *iso_sched, - unsigned index, - u16 uframe -) -{ - struct fotg210_iso_packet *uf = &iso_sched->packet[index]; - unsigned pg = itd->pg; - - uframe &= 0x07; - itd->index[uframe] = index; - - itd->hw_transaction[uframe] = uf->transaction; - itd->hw_transaction[uframe] |= cpu_to_hc32(fotg210, pg << 12); - itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, uf->bufp & ~(u32)0); - itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(uf->bufp >> 32)); - - /* iso_frame_desc[].offset must be strictly increasing */ - if (unlikely(uf->cross)) { - u64 bufp = uf->bufp + 4096; - - itd->pg = ++pg; - itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, bufp & ~(u32)0); - itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(bufp >> 32)); - } -} - -static inline void -itd_link(struct fotg210_hcd *fotg210, unsigned frame, struct fotg210_itd *itd) -{ - union fotg210_shadow *prev = &fotg210->pshadow[frame]; - __hc32 *hw_p = &fotg210->periodic[frame]; - union fotg210_shadow here = *prev; - __hc32 type = 0; - - /* skip any iso nodes which might belong to previous microframes */ - while (here.ptr) { - type = Q_NEXT_TYPE(fotg210, *hw_p); - if (type == cpu_to_hc32(fotg210, Q_TYPE_QH)) - break; - prev = periodic_next_shadow(fotg210, prev, type); - hw_p = shadow_next_periodic(fotg210, &here, type); - here = *prev; - } - - itd->itd_next = here; - itd->hw_next = *hw_p; - prev->itd = itd; - itd->frame = frame; - wmb(); - *hw_p = cpu_to_hc32(fotg210, itd->itd_dma | Q_TYPE_ITD); -} - -/* fit urb's itds into the selected schedule slot; activate as needed */ -static void itd_link_urb( - struct fotg210_hcd *fotg210, - struct urb *urb, - unsigned mod, - struct fotg210_iso_stream *stream -) -{ - int packet; - unsigned next_uframe, uframe, frame; - struct fotg210_iso_sched *iso_sched = urb->hcpriv; - struct fotg210_itd *itd; - - next_uframe = stream->next_uframe & (mod - 1); - - if (unlikely(list_empty(&stream->td_list))) { - fotg210_to_hcd(fotg210)->self.bandwidth_allocated - += stream->bandwidth; - fotg210_vdbg(fotg210, - "schedule devp %s ep%d%s-iso period %d start %d.%d\n", - urb->dev->devpath, stream->bEndpointAddress & 0x0f, - (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out", - urb->interval, - next_uframe >> 3, next_uframe & 0x7); - } - - /* fill iTDs uframe by uframe */ - for (packet = 0, itd = NULL; packet < urb->number_of_packets;) { - if (itd == NULL) { - /* ASSERT: we have all necessary itds */ - - /* ASSERT: no itds for this endpoint in this uframe */ - - itd = list_entry(iso_sched->td_list.next, - struct fotg210_itd, itd_list); - list_move_tail(&itd->itd_list, &stream->td_list); - itd->stream = stream; - itd->urb = urb; - itd_init(fotg210, stream, itd); - } - - uframe = next_uframe & 0x07; - frame = next_uframe >> 3; - - itd_patch(fotg210, itd, iso_sched, packet, uframe); - - next_uframe += stream->interval; - next_uframe &= mod - 1; - packet++; - - /* link completed itds into the schedule */ - if (((next_uframe >> 3) != frame) - || packet == urb->number_of_packets) { - itd_link(fotg210, frame & (fotg210->periodic_size - 1), - itd); - itd = NULL; - } - } - stream->next_uframe = next_uframe; - - /* don't need that schedule data any more */ - iso_sched_free(stream, iso_sched); - urb->hcpriv = NULL; - - ++fotg210->isoc_count; - enable_periodic(fotg210); -} - -#define ISO_ERRS (FOTG210_ISOC_BUF_ERR | FOTG210_ISOC_BABBLE |\ - FOTG210_ISOC_XACTERR) - -/* Process and recycle a completed ITD. Return true iff its urb completed, - * and hence its completion callback probably added things to the hardware - * schedule. - * - * Note that we carefully avoid recycling this descriptor until after any - * completion callback runs, so that it won't be reused quickly. That is, - * assuming (a) no more than two urbs per frame on this endpoint, and also - * (b) only this endpoint's completions submit URBs. It seems some silicon - * corrupts things if you reuse completed descriptors very quickly... - */ -static bool itd_complete(struct fotg210_hcd *fotg210, struct fotg210_itd *itd) -{ - struct urb *urb = itd->urb; - struct usb_iso_packet_descriptor *desc; - u32 t; - unsigned uframe; - int urb_index = -1; - struct fotg210_iso_stream *stream = itd->stream; - struct usb_device *dev; - bool retval = false; - - /* for each uframe with a packet */ - for (uframe = 0; uframe < 8; uframe++) { - if (likely(itd->index[uframe] == -1)) - continue; - urb_index = itd->index[uframe]; - desc = &urb->iso_frame_desc[urb_index]; - - t = hc32_to_cpup(fotg210, &itd->hw_transaction[uframe]); - itd->hw_transaction[uframe] = 0; - - /* report transfer status */ - if (unlikely(t & ISO_ERRS)) { - urb->error_count++; - if (t & FOTG210_ISOC_BUF_ERR) - desc->status = usb_pipein(urb->pipe) - ? -ENOSR /* hc couldn't read */ - : -ECOMM; /* hc couldn't write */ - else if (t & FOTG210_ISOC_BABBLE) - desc->status = -EOVERFLOW; - else /* (t & FOTG210_ISOC_XACTERR) */ - desc->status = -EPROTO; - - /* HC need not update length with this error */ - if (!(t & FOTG210_ISOC_BABBLE)) { - desc->actual_length = - fotg210_itdlen(urb, desc, t); - urb->actual_length += desc->actual_length; - } - } else if (likely((t & FOTG210_ISOC_ACTIVE) == 0)) { - desc->status = 0; - desc->actual_length = fotg210_itdlen(urb, desc, t); - urb->actual_length += desc->actual_length; - } else { - /* URB was too late */ - desc->status = -EXDEV; - } - } - - /* handle completion now? */ - if (likely((urb_index + 1) != urb->number_of_packets)) - goto done; - - /* ASSERT: it's really the last itd for this urb - list_for_each_entry (itd, &stream->td_list, itd_list) - BUG_ON (itd->urb == urb); - */ - - /* give urb back to the driver; completion often (re)submits */ - dev = urb->dev; - fotg210_urb_done(fotg210, urb, 0); - retval = true; - urb = NULL; - - --fotg210->isoc_count; - disable_periodic(fotg210); - - if (unlikely(list_is_singular(&stream->td_list))) { - fotg210_to_hcd(fotg210)->self.bandwidth_allocated - -= stream->bandwidth; - fotg210_vdbg(fotg210, - "deschedule devp %s ep%d%s-iso\n", - dev->devpath, stream->bEndpointAddress & 0x0f, - (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out"); - } - -done: - itd->urb = NULL; - - /* Add to the end of the free list for later reuse */ - list_move_tail(&itd->itd_list, &stream->free_list); - - /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */ - if (list_empty(&stream->td_list)) { - list_splice_tail_init(&stream->free_list, - &fotg210->cached_itd_list); - start_free_itds(fotg210); - } - - return retval; -} - -/*-------------------------------------------------------------------------*/ - -static int itd_submit(struct fotg210_hcd *fotg210, struct urb *urb, - gfp_t mem_flags) -{ - int status = -EINVAL; - unsigned long flags; - struct fotg210_iso_stream *stream; - - /* Get iso_stream head */ - stream = iso_stream_find(fotg210, urb); - if (unlikely(stream == NULL)) { - fotg210_dbg(fotg210, "can't get iso stream\n"); - return -ENOMEM; - } - if (unlikely(urb->interval != stream->interval && - fotg210_port_speed(fotg210, 0) == - USB_PORT_STAT_HIGH_SPEED)) { - fotg210_dbg(fotg210, "can't change iso interval %d --> %d\n", - stream->interval, urb->interval); - goto done; - } - -#ifdef FOTG210_URB_TRACE - fotg210_dbg(fotg210, - "%s %s urb %p ep%d%s len %d, %d pkts %d uframes[%p]\n", - __func__, urb->dev->devpath, urb, - usb_pipeendpoint(urb->pipe), - usb_pipein(urb->pipe) ? "in" : "out", - urb->transfer_buffer_length, - urb->number_of_packets, urb->interval, - stream); -#endif - - /* allocate ITDs w/o locking anything */ - status = itd_urb_transaction(stream, fotg210, urb, mem_flags); - if (unlikely(status < 0)) { - fotg210_dbg(fotg210, "can't init itds\n"); - goto done; - } - - /* schedule ... need to lock */ - spin_lock_irqsave(&fotg210->lock, flags); - if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) { - status = -ESHUTDOWN; - goto done_not_linked; - } - status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb); - if (unlikely(status)) - goto done_not_linked; - status = iso_stream_schedule(fotg210, urb, stream); - if (likely(status == 0)) - itd_link_urb(fotg210, urb, fotg210->periodic_size << 3, stream); - else - usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb); - done_not_linked: - spin_unlock_irqrestore(&fotg210->lock, flags); - done: - return status; -} - -/*-------------------------------------------------------------------------*/ - -static void scan_isoc(struct fotg210_hcd *fotg210) -{ - unsigned uf, now_frame, frame; - unsigned fmask = fotg210->periodic_size - 1; - bool modified, live; - - /* - * When running, scan from last scan point up to "now" - * else clean up by scanning everything that's left. - * Touches as few pages as possible: cache-friendly. - */ - if (fotg210->rh_state >= FOTG210_RH_RUNNING) { - uf = fotg210_read_frame_index(fotg210); - now_frame = (uf >> 3) & fmask; - live = true; - } else { - now_frame = (fotg210->next_frame - 1) & fmask; - live = false; - } - fotg210->now_frame = now_frame; - - frame = fotg210->next_frame; - for (;;) { - union fotg210_shadow q, *q_p; - __hc32 type, *hw_p; - -restart: - /* scan each element in frame's queue for completions */ - q_p = &fotg210->pshadow[frame]; - hw_p = &fotg210->periodic[frame]; - q.ptr = q_p->ptr; - type = Q_NEXT_TYPE(fotg210, *hw_p); - modified = false; - - while (q.ptr != NULL) { - switch (hc32_to_cpu(fotg210, type)) { - case Q_TYPE_ITD: - /* If this ITD is still active, leave it for - * later processing ... check the next entry. - * No need to check for activity unless the - * frame is current. - */ - if (frame == now_frame && live) { - rmb(); - for (uf = 0; uf < 8; uf++) { - if (q.itd->hw_transaction[uf] & - ITD_ACTIVE(fotg210)) - break; - } - if (uf < 8) { - q_p = &q.itd->itd_next; - hw_p = &q.itd->hw_next; - type = Q_NEXT_TYPE(fotg210, - q.itd->hw_next); - q = *q_p; - break; - } - } - - /* Take finished ITDs out of the schedule - * and process them: recycle, maybe report - * URB completion. HC won't cache the - * pointer for much longer, if at all. - */ - *q_p = q.itd->itd_next; - *hw_p = q.itd->hw_next; - type = Q_NEXT_TYPE(fotg210, q.itd->hw_next); - wmb(); - modified = itd_complete(fotg210, q.itd); - q = *q_p; - break; - default: - fotg210_dbg(fotg210, "corrupt type %d frame %d shadow %p\n", - type, frame, q.ptr); - /* FALL THROUGH */ - case Q_TYPE_QH: - case Q_TYPE_FSTN: - /* End of the iTDs and siTDs */ - q.ptr = NULL; - break; - } - - /* assume completion callbacks modify the queue */ - if (unlikely(modified && fotg210->isoc_count > 0)) - goto restart; - } - - /* Stop when we have reached the current frame */ - if (frame == now_frame) - break; - frame = (frame + 1) & fmask; - } - fotg210->next_frame = now_frame; -} -/*-------------------------------------------------------------------------*/ -/* - * Display / Set uframe_periodic_max - */ -static ssize_t show_uframe_periodic_max(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct fotg210_hcd *fotg210; - int n; - - fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev))); - n = scnprintf(buf, PAGE_SIZE, "%d\n", fotg210->uframe_periodic_max); - return n; -} - - -static ssize_t store_uframe_periodic_max(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct fotg210_hcd *fotg210; - unsigned uframe_periodic_max; - unsigned frame, uframe; - unsigned short allocated_max; - unsigned long flags; - ssize_t ret; - - fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev))); - if (kstrtouint(buf, 0, &uframe_periodic_max) < 0) - return -EINVAL; - - if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) { - fotg210_info(fotg210, "rejecting invalid request for uframe_periodic_max=%u\n", - uframe_periodic_max); - return -EINVAL; - } - - ret = -EINVAL; - - /* - * lock, so that our checking does not race with possible periodic - * bandwidth allocation through submitting new urbs. - */ - spin_lock_irqsave(&fotg210->lock, flags); - - /* - * for request to decrease max periodic bandwidth, we have to check - * every microframe in the schedule to see whether the decrease is - * possible. - */ - if (uframe_periodic_max < fotg210->uframe_periodic_max) { - allocated_max = 0; - - for (frame = 0; frame < fotg210->periodic_size; ++frame) - for (uframe = 0; uframe < 7; ++uframe) - allocated_max = max(allocated_max, - periodic_usecs(fotg210, frame, uframe)); - - if (allocated_max > uframe_periodic_max) { - fotg210_info(fotg210, - "cannot decrease uframe_periodic_max becase " - "periodic bandwidth is already allocated " - "(%u > %u)\n", - allocated_max, uframe_periodic_max); - goto out_unlock; - } - } - - /* increasing is always ok */ - - fotg210_info(fotg210, "setting max periodic bandwidth to %u%% (== %u usec/uframe)\n", - 100 * uframe_periodic_max/125, uframe_periodic_max); - - if (uframe_periodic_max != 100) - fotg210_warn(fotg210, "max periodic bandwidth set is non-standard\n"); - - fotg210->uframe_periodic_max = uframe_periodic_max; - ret = count; - -out_unlock: - spin_unlock_irqrestore(&fotg210->lock, flags); - return ret; -} - -static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max, - store_uframe_periodic_max); - -static inline int create_sysfs_files(struct fotg210_hcd *fotg210) -{ - struct device *controller = fotg210_to_hcd(fotg210)->self.controller; - int i = 0; - - if (i) - goto out; - - i = device_create_file(controller, &dev_attr_uframe_periodic_max); -out: - return i; -} - -static inline void remove_sysfs_files(struct fotg210_hcd *fotg210) -{ - struct device *controller = fotg210_to_hcd(fotg210)->self.controller; - - device_remove_file(controller, &dev_attr_uframe_periodic_max); -} -/*-------------------------------------------------------------------------*/ - -/* On some systems, leaving remote wakeup enabled prevents system shutdown. - * The firmware seems to think that powering off is a wakeup event! - * This routine turns off remote wakeup and everything else, on all ports. - */ -static void fotg210_turn_off_all_ports(struct fotg210_hcd *fotg210) -{ - u32 __iomem *status_reg = &fotg210->regs->port_status; - - fotg210_writel(fotg210, PORT_RWC_BITS, status_reg); -} - -/* - * Halt HC, turn off all ports, and let the BIOS use the companion controllers. - * Must be called with interrupts enabled and the lock not held. - */ -static void fotg210_silence_controller(struct fotg210_hcd *fotg210) -{ - fotg210_halt(fotg210); - - spin_lock_irq(&fotg210->lock); - fotg210->rh_state = FOTG210_RH_HALTED; - fotg210_turn_off_all_ports(fotg210); - spin_unlock_irq(&fotg210->lock); -} - -/* fotg210_shutdown kick in for silicon on any bus (not just pci, etc). - * This forcibly disables dma and IRQs, helping kexec and other cases - * where the next system software may expect clean state. - */ -static void fotg210_shutdown(struct usb_hcd *hcd) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - - spin_lock_irq(&fotg210->lock); - fotg210->shutdown = true; - fotg210->rh_state = FOTG210_RH_STOPPING; - fotg210->enabled_hrtimer_events = 0; - spin_unlock_irq(&fotg210->lock); - - fotg210_silence_controller(fotg210); - - hrtimer_cancel(&fotg210->hrtimer); -} - -/*-------------------------------------------------------------------------*/ - -/* - * fotg210_work is called from some interrupts, timers, and so on. - * it calls driver completion functions, after dropping fotg210->lock. - */ -static void fotg210_work(struct fotg210_hcd *fotg210) -{ - /* another CPU may drop fotg210->lock during a schedule scan while - * it reports urb completions. this flag guards against bogus - * attempts at re-entrant schedule scanning. - */ - if (fotg210->scanning) { - fotg210->need_rescan = true; - return; - } - fotg210->scanning = true; - - rescan: - fotg210->need_rescan = false; - if (fotg210->async_count) - scan_async(fotg210); - if (fotg210->intr_count > 0) - scan_intr(fotg210); - if (fotg210->isoc_count > 0) - scan_isoc(fotg210); - if (fotg210->need_rescan) - goto rescan; - fotg210->scanning = false; - - /* the IO watchdog guards against hardware or driver bugs that - * misplace IRQs, and should let us run completely without IRQs. - * such lossage has been observed on both VT6202 and VT8235. - */ - turn_on_io_watchdog(fotg210); -} - -/* - * Called when the fotg210_hcd module is removed. - */ -static void fotg210_stop(struct usb_hcd *hcd) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - - fotg210_dbg(fotg210, "stop\n"); - - /* no more interrupts ... */ - - spin_lock_irq(&fotg210->lock); - fotg210->enabled_hrtimer_events = 0; - spin_unlock_irq(&fotg210->lock); - - fotg210_quiesce(fotg210); - fotg210_silence_controller(fotg210); - fotg210_reset(fotg210); - - hrtimer_cancel(&fotg210->hrtimer); - remove_sysfs_files(fotg210); - remove_debug_files(fotg210); - - /* root hub is shut down separately (first, when possible) */ - spin_lock_irq(&fotg210->lock); - end_free_itds(fotg210); - spin_unlock_irq(&fotg210->lock); - fotg210_mem_cleanup(fotg210); - -#ifdef FOTG210_STATS - fotg210_dbg(fotg210, "irq normal %ld err %ld iaa %ld (lost %ld)\n", - fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa, - fotg210->stats.lost_iaa); - fotg210_dbg(fotg210, "complete %ld unlink %ld\n", - fotg210->stats.complete, fotg210->stats.unlink); -#endif - - dbg_status(fotg210, "fotg210_stop completed", - fotg210_readl(fotg210, &fotg210->regs->status)); -} - -/* one-time init, only for memory state */ -static int hcd_fotg210_init(struct usb_hcd *hcd) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - u32 temp; - int retval; - u32 hcc_params; - struct fotg210_qh_hw *hw; - - spin_lock_init(&fotg210->lock); - - /* - * keep io watchdog by default, those good HCDs could turn off it later - */ - fotg210->need_io_watchdog = 1; - - hrtimer_init(&fotg210->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); - fotg210->hrtimer.function = fotg210_hrtimer_func; - fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT; - - hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); - - /* - * by default set standard 80% (== 100 usec/uframe) max periodic - * bandwidth as required by USB 2.0 - */ - fotg210->uframe_periodic_max = 100; - - /* - * hw default: 1K periodic list heads, one per frame. - * periodic_size can shrink by USBCMD update if hcc_params allows. - */ - fotg210->periodic_size = DEFAULT_I_TDPS; - INIT_LIST_HEAD(&fotg210->intr_qh_list); - INIT_LIST_HEAD(&fotg210->cached_itd_list); - - if (HCC_PGM_FRAMELISTLEN(hcc_params)) { - /* periodic schedule size can be smaller than default */ - switch (FOTG210_TUNE_FLS) { - case 0: - fotg210->periodic_size = 1024; - break; - case 1: - fotg210->periodic_size = 512; - break; - case 2: - fotg210->periodic_size = 256; - break; - default: - BUG(); - } - } - retval = fotg210_mem_init(fotg210, GFP_KERNEL); - if (retval < 0) - return retval; - - /* controllers may cache some of the periodic schedule ... */ - fotg210->i_thresh = 2; - - /* - * dedicate a qh for the async ring head, since we couldn't unlink - * a 'real' qh without stopping the async schedule [4.8]. use it - * as the 'reclamation list head' too. - * its dummy is used in hw_alt_next of many tds, to prevent the qh - * from automatically advancing to the next td after short reads. - */ - fotg210->async->qh_next.qh = NULL; - hw = fotg210->async->hw; - hw->hw_next = QH_NEXT(fotg210, fotg210->async->qh_dma); - hw->hw_info1 = cpu_to_hc32(fotg210, QH_HEAD); - hw->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT); - hw->hw_qtd_next = FOTG210_LIST_END(fotg210); - fotg210->async->qh_state = QH_STATE_LINKED; - hw->hw_alt_next = QTD_NEXT(fotg210, fotg210->async->dummy->qtd_dma); - - /* clear interrupt enables, set irq latency */ - if (log2_irq_thresh < 0 || log2_irq_thresh > 6) - log2_irq_thresh = 0; - temp = 1 << (16 + log2_irq_thresh); - if (HCC_CANPARK(hcc_params)) { - /* HW default park == 3, on hardware that supports it (like - * NVidia and ALI silicon), maximizes throughput on the async - * schedule by avoiding QH fetches between transfers. - * - * With fast usb storage devices and NForce2, "park" seems to - * make problems: throughput reduction (!), data errors... - */ - if (park) { - park = min_t(unsigned, park, 3); - temp |= CMD_PARK; - temp |= park << 8; - } - fotg210_dbg(fotg210, "park %d\n", park); - } - if (HCC_PGM_FRAMELISTLEN(hcc_params)) { - /* periodic schedule size can be smaller than default */ - temp &= ~(3 << 2); - temp |= (FOTG210_TUNE_FLS << 2); - } - fotg210->command = temp; - - /* Accept arbitrarily long scatter-gather lists */ - if (!(hcd->driver->flags & HCD_LOCAL_MEM)) - hcd->self.sg_tablesize = ~0; - return 0; -} - -/* start HC running; it's halted, hcd_fotg210_init() has been run (once) */ -static int fotg210_run(struct usb_hcd *hcd) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - u32 temp; - u32 hcc_params; - - hcd->uses_new_polling = 1; - - /* EHCI spec section 4.1 */ - - fotg210_writel(fotg210, fotg210->periodic_dma, - &fotg210->regs->frame_list); - fotg210_writel(fotg210, (u32)fotg210->async->qh_dma, - &fotg210->regs->async_next); - - /* - * hcc_params controls whether fotg210->regs->segment must (!!!) - * be used; it constrains QH/ITD/SITD and QTD locations. - * pci_pool consistent memory always uses segment zero. - * streaming mappings for I/O buffers, like pci_map_single(), - * can return segments above 4GB, if the device allows. - * - * NOTE: the dma mask is visible through dma_supported(), so - * drivers can pass this info along ... like NETIF_F_HIGHDMA, - * Scsi_Host.highmem_io, and so forth. It's readonly to all - * host side drivers though. - */ - hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params); - - /* - * Philips, Intel, and maybe others need CMD_RUN before the - * root hub will detect new devices (why?); NEC doesn't - */ - fotg210->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET); - fotg210->command |= CMD_RUN; - fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command); - dbg_cmd(fotg210, "init", fotg210->command); - - /* - * Start, enabling full USB 2.0 functionality ... usb 1.1 devices - * are explicitly handed to companion controller(s), so no TT is - * involved with the root hub. (Except where one is integrated, - * and there's no companion controller unless maybe for USB OTG.) - * - * Turning on the CF flag will transfer ownership of all ports - * from the companions to the EHCI controller. If any of the - * companions are in the middle of a port reset at the time, it - * could cause trouble. Write-locking ehci_cf_port_reset_rwsem - * guarantees that no resets are in progress. After we set CF, - * a short delay lets the hardware catch up; new resets shouldn't - * be started before the port switching actions could complete. - */ - down_write(&ehci_cf_port_reset_rwsem); - fotg210->rh_state = FOTG210_RH_RUNNING; - /* unblock posted writes */ - fotg210_readl(fotg210, &fotg210->regs->command); - msleep(5); - up_write(&ehci_cf_port_reset_rwsem); - fotg210->last_periodic_enable = ktime_get_real(); - - temp = HC_VERSION(fotg210, - fotg210_readl(fotg210, &fotg210->caps->hc_capbase)); - fotg210_info(fotg210, - "USB %x.%x started, EHCI %x.%02x\n", - ((fotg210->sbrn & 0xf0)>>4), (fotg210->sbrn & 0x0f), - temp >> 8, temp & 0xff); - - fotg210_writel(fotg210, INTR_MASK, - &fotg210->regs->intr_enable); /* Turn On Interrupts */ - - /* GRR this is run-once init(), being done every time the HC starts. - * So long as they're part of class devices, we can't do it init() - * since the class device isn't created that early. - */ - create_debug_files(fotg210); - create_sysfs_files(fotg210); - - return 0; -} - -static int fotg210_setup(struct usb_hcd *hcd) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - int retval; - - fotg210->regs = (void __iomem *)fotg210->caps + - HC_LENGTH(fotg210, - fotg210_readl(fotg210, &fotg210->caps->hc_capbase)); - dbg_hcs_params(fotg210, "reset"); - dbg_hcc_params(fotg210, "reset"); - - /* cache this readonly data; minimize chip reads */ - fotg210->hcs_params = fotg210_readl(fotg210, - &fotg210->caps->hcs_params); - - fotg210->sbrn = HCD_USB2; - - /* data structure init */ - retval = hcd_fotg210_init(hcd); - if (retval) - return retval; - - retval = fotg210_halt(fotg210); - if (retval) - return retval; - - fotg210_reset(fotg210); - - return 0; -} - -/*-------------------------------------------------------------------------*/ - -static irqreturn_t fotg210_irq(struct usb_hcd *hcd) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - u32 status, masked_status, pcd_status = 0, cmd; - int bh; - - spin_lock(&fotg210->lock); - - status = fotg210_readl(fotg210, &fotg210->regs->status); - - /* e.g. cardbus physical eject */ - if (status == ~(u32) 0) { - fotg210_dbg(fotg210, "device removed\n"); - goto dead; - } - - /* - * We don't use STS_FLR, but some controllers don't like it to - * remain on, so mask it out along with the other status bits. - */ - masked_status = status & (INTR_MASK | STS_FLR); - - /* Shared IRQ? */ - if (!masked_status || - unlikely(fotg210->rh_state == FOTG210_RH_HALTED)) { - spin_unlock(&fotg210->lock); - return IRQ_NONE; - } - - /* clear (just) interrupts */ - fotg210_writel(fotg210, masked_status, &fotg210->regs->status); - cmd = fotg210_readl(fotg210, &fotg210->regs->command); - bh = 0; - -#ifdef VERBOSE_DEBUG - /* unrequested/ignored: Frame List Rollover */ - dbg_status(fotg210, "irq", status); -#endif - - /* INT, ERR, and IAA interrupt rates can be throttled */ - - /* normal [4.15.1.2] or error [4.15.1.1] completion */ - if (likely((status & (STS_INT|STS_ERR)) != 0)) { - if (likely((status & STS_ERR) == 0)) - COUNT(fotg210->stats.normal); - else - COUNT(fotg210->stats.error); - bh = 1; - } - - /* complete the unlinking of some qh [4.15.2.3] */ - if (status & STS_IAA) { - - /* Turn off the IAA watchdog */ - fotg210->enabled_hrtimer_events &= - ~BIT(FOTG210_HRTIMER_IAA_WATCHDOG); - - /* - * Mild optimization: Allow another IAAD to reset the - * hrtimer, if one occurs before the next expiration. - * In theory we could always cancel the hrtimer, but - * tests show that about half the time it will be reset - * for some other event anyway. - */ - if (fotg210->next_hrtimer_event == FOTG210_HRTIMER_IAA_WATCHDOG) - ++fotg210->next_hrtimer_event; - - /* guard against (alleged) silicon errata */ - if (cmd & CMD_IAAD) - fotg210_dbg(fotg210, "IAA with IAAD still set?\n"); - if (fotg210->async_iaa) { - COUNT(fotg210->stats.iaa); - end_unlink_async(fotg210); - } else - fotg210_dbg(fotg210, "IAA with nothing unlinked?\n"); - } - - /* remote wakeup [4.3.1] */ - if (status & STS_PCD) { - int pstatus; - u32 __iomem *status_reg = &fotg210->regs->port_status; - - /* kick root hub later */ - pcd_status = status; - - /* resume root hub? */ - if (fotg210->rh_state == FOTG210_RH_SUSPENDED) - usb_hcd_resume_root_hub(hcd); - - pstatus = fotg210_readl(fotg210, status_reg); - - if (test_bit(0, &fotg210->suspended_ports) && - ((pstatus & PORT_RESUME) || - !(pstatus & PORT_SUSPEND)) && - (pstatus & PORT_PE) && - fotg210->reset_done[0] == 0) { - - /* start 20 msec resume signaling from this port, - * and make khubd collect PORT_STAT_C_SUSPEND to - * stop that signaling. Use 5 ms extra for safety, - * like usb_port_resume() does. - */ - fotg210->reset_done[0] = jiffies + msecs_to_jiffies(25); - set_bit(0, &fotg210->resuming_ports); - fotg210_dbg(fotg210, "port 1 remote wakeup\n"); - mod_timer(&hcd->rh_timer, fotg210->reset_done[0]); - } - } - - /* PCI errors [4.15.2.4] */ - if (unlikely((status & STS_FATAL) != 0)) { - fotg210_err(fotg210, "fatal error\n"); - dbg_cmd(fotg210, "fatal", cmd); - dbg_status(fotg210, "fatal", status); -dead: - usb_hc_died(hcd); - - /* Don't let the controller do anything more */ - fotg210->shutdown = true; - fotg210->rh_state = FOTG210_RH_STOPPING; - fotg210->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE); - fotg210_writel(fotg210, fotg210->command, - &fotg210->regs->command); - fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable); - fotg210_handle_controller_death(fotg210); - - /* Handle completions when the controller stops */ - bh = 0; - } - - if (bh) - fotg210_work(fotg210); - spin_unlock(&fotg210->lock); - if (pcd_status) - usb_hcd_poll_rh_status(hcd); - return IRQ_HANDLED; -} - -/*-------------------------------------------------------------------------*/ - -/* - * non-error returns are a promise to giveback() the urb later - * we drop ownership so next owner (or urb unlink) can get it - * - * urb + dev is in hcd.self.controller.urb_list - * we're queueing TDs onto software and hardware lists - * - * hcd-specific init for hcpriv hasn't been done yet - * - * NOTE: control, bulk, and interrupt share the same code to append TDs - * to a (possibly active) QH, and the same QH scanning code. - */ -static int fotg210_urb_enqueue( - struct usb_hcd *hcd, - struct urb *urb, - gfp_t mem_flags -) { - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - struct list_head qtd_list; - - INIT_LIST_HEAD(&qtd_list); - - switch (usb_pipetype(urb->pipe)) { - case PIPE_CONTROL: - /* qh_completions() code doesn't handle all the fault cases - * in multi-TD control transfers. Even 1KB is rare anyway. - */ - if (urb->transfer_buffer_length > (16 * 1024)) - return -EMSGSIZE; - /* FALLTHROUGH */ - /* case PIPE_BULK: */ - default: - if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags)) - return -ENOMEM; - return submit_async(fotg210, urb, &qtd_list, mem_flags); - - case PIPE_INTERRUPT: - if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags)) - return -ENOMEM; - return intr_submit(fotg210, urb, &qtd_list, mem_flags); - - case PIPE_ISOCHRONOUS: - return itd_submit(fotg210, urb, mem_flags); - } -} - -/* remove from hardware lists - * completions normally happen asynchronously - */ - -static int fotg210_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - struct fotg210_qh *qh; - unsigned long flags; - int rc; - - spin_lock_irqsave(&fotg210->lock, flags); - rc = usb_hcd_check_unlink_urb(hcd, urb, status); - if (rc) - goto done; - - switch (usb_pipetype(urb->pipe)) { - /* case PIPE_CONTROL: */ - /* case PIPE_BULK:*/ - default: - qh = (struct fotg210_qh *) urb->hcpriv; - if (!qh) - break; - switch (qh->qh_state) { - case QH_STATE_LINKED: - case QH_STATE_COMPLETING: - start_unlink_async(fotg210, qh); - break; - case QH_STATE_UNLINK: - case QH_STATE_UNLINK_WAIT: - /* already started */ - break; - case QH_STATE_IDLE: - /* QH might be waiting for a Clear-TT-Buffer */ - qh_completions(fotg210, qh); - break; - } - break; - - case PIPE_INTERRUPT: - qh = (struct fotg210_qh *) urb->hcpriv; - if (!qh) - break; - switch (qh->qh_state) { - case QH_STATE_LINKED: - case QH_STATE_COMPLETING: - start_unlink_intr(fotg210, qh); - break; - case QH_STATE_IDLE: - qh_completions(fotg210, qh); - break; - default: - fotg210_dbg(fotg210, "bogus qh %p state %d\n", - qh, qh->qh_state); - goto done; - } - break; - - case PIPE_ISOCHRONOUS: - /* itd... */ - - /* wait till next completion, do it then. */ - /* completion irqs can wait up to 1024 msec, */ - break; - } -done: - spin_unlock_irqrestore(&fotg210->lock, flags); - return rc; -} - -/*-------------------------------------------------------------------------*/ - -/* bulk qh holds the data toggle */ - -static void -fotg210_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - unsigned long flags; - struct fotg210_qh *qh, *tmp; - - /* ASSERT: any requests/urbs are being unlinked */ - /* ASSERT: nobody can be submitting urbs for this any more */ - -rescan: - spin_lock_irqsave(&fotg210->lock, flags); - qh = ep->hcpriv; - if (!qh) - goto done; - - /* endpoints can be iso streams. for now, we don't - * accelerate iso completions ... so spin a while. - */ - if (qh->hw == NULL) { - struct fotg210_iso_stream *stream = ep->hcpriv; - - if (!list_empty(&stream->td_list)) - goto idle_timeout; - - /* BUG_ON(!list_empty(&stream->free_list)); */ - kfree(stream); - goto done; - } - - if (fotg210->rh_state < FOTG210_RH_RUNNING) - qh->qh_state = QH_STATE_IDLE; - switch (qh->qh_state) { - case QH_STATE_LINKED: - case QH_STATE_COMPLETING: - for (tmp = fotg210->async->qh_next.qh; - tmp && tmp != qh; - tmp = tmp->qh_next.qh) - continue; - /* periodic qh self-unlinks on empty, and a COMPLETING qh - * may already be unlinked. - */ - if (tmp) - start_unlink_async(fotg210, qh); - /* FALL THROUGH */ - case QH_STATE_UNLINK: /* wait for hw to finish? */ - case QH_STATE_UNLINK_WAIT: -idle_timeout: - spin_unlock_irqrestore(&fotg210->lock, flags); - schedule_timeout_uninterruptible(1); - goto rescan; - case QH_STATE_IDLE: /* fully unlinked */ - if (qh->clearing_tt) - goto idle_timeout; - if (list_empty(&qh->qtd_list)) { - qh_destroy(fotg210, qh); - break; - } - /* else FALL THROUGH */ - default: - /* caller was supposed to have unlinked any requests; - * that's not our job. just leak this memory. - */ - fotg210_err(fotg210, "qh %p (#%02x) state %d%s\n", - qh, ep->desc.bEndpointAddress, qh->qh_state, - list_empty(&qh->qtd_list) ? "" : "(has tds)"); - break; - } - done: - ep->hcpriv = NULL; - spin_unlock_irqrestore(&fotg210->lock, flags); -} - -static void -fotg210_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - struct fotg210_qh *qh; - int eptype = usb_endpoint_type(&ep->desc); - int epnum = usb_endpoint_num(&ep->desc); - int is_out = usb_endpoint_dir_out(&ep->desc); - unsigned long flags; - - if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT) - return; - - spin_lock_irqsave(&fotg210->lock, flags); - qh = ep->hcpriv; - - /* For Bulk and Interrupt endpoints we maintain the toggle state - * in the hardware; the toggle bits in udev aren't used at all. - * When an endpoint is reset by usb_clear_halt() we must reset - * the toggle bit in the QH. - */ - if (qh) { - usb_settoggle(qh->dev, epnum, is_out, 0); - if (!list_empty(&qh->qtd_list)) { - WARN_ONCE(1, "clear_halt for a busy endpoint\n"); - } else if (qh->qh_state == QH_STATE_LINKED || - qh->qh_state == QH_STATE_COMPLETING) { - - /* The toggle value in the QH can't be updated - * while the QH is active. Unlink it now; - * re-linking will call qh_refresh(). - */ - if (eptype == USB_ENDPOINT_XFER_BULK) - start_unlink_async(fotg210, qh); - else - start_unlink_intr(fotg210, qh); - } - } - spin_unlock_irqrestore(&fotg210->lock, flags); -} - -static int fotg210_get_frame(struct usb_hcd *hcd) -{ - struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd); - return (fotg210_read_frame_index(fotg210) >> 3) % - fotg210->periodic_size; -} - -/*-------------------------------------------------------------------------*/ - -/* - * The EHCI in ChipIdea HDRC cannot be a separate module or device, - * because its registers (and irq) are shared between host/gadget/otg - * functions and in order to facilitate role switching we cannot - * give the fotg210 driver exclusive access to those. - */ -MODULE_DESCRIPTION(DRIVER_DESC); -MODULE_AUTHOR(DRIVER_AUTHOR); -MODULE_LICENSE("GPL"); - -static const struct hc_driver fotg210_fotg210_hc_driver = { - .description = hcd_name, - .product_desc = "Faraday USB2.0 Host Controller", - .hcd_priv_size = sizeof(struct fotg210_hcd), - - /* - * generic hardware linkage - */ - .irq = fotg210_irq, - .flags = HCD_MEMORY | HCD_USB2, - - /* - * basic lifecycle operations - */ - .reset = hcd_fotg210_init, - .start = fotg210_run, - .stop = fotg210_stop, - .shutdown = fotg210_shutdown, - - /* - * managing i/o requests and associated device resources - */ - .urb_enqueue = fotg210_urb_enqueue, - .urb_dequeue = fotg210_urb_dequeue, - .endpoint_disable = fotg210_endpoint_disable, - .endpoint_reset = fotg210_endpoint_reset, - - /* - * scheduling support - */ - .get_frame_number = fotg210_get_frame, - - /* - * root hub support - */ - .hub_status_data = fotg210_hub_status_data, - .hub_control = fotg210_hub_control, - .bus_suspend = fotg210_bus_suspend, - .bus_resume = fotg210_bus_resume, - - .relinquish_port = fotg210_relinquish_port, - .port_handed_over = fotg210_port_handed_over, - - .clear_tt_buffer_complete = fotg210_clear_tt_buffer_complete, -}; - -static void fotg210_init(struct fotg210_hcd *fotg210) -{ - u32 value; - - iowrite32(GMIR_MDEV_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY, - &fotg210->regs->gmir); - - value = ioread32(&fotg210->regs->otgcsr); - value &= ~OTGCSR_A_BUS_DROP; - value |= OTGCSR_A_BUS_REQ; - iowrite32(value, &fotg210->regs->otgcsr); -} - -/** - * fotg210_hcd_probe - initialize faraday FOTG210 HCDs - * - * Allocates basic resources for this USB host controller, and - * then invokes the start() method for the HCD associated with it - * through the hotplug entry's driver_data. - */ -static int fotg210_hcd_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct usb_hcd *hcd; - struct resource *res; - int irq; - int retval = -ENODEV; - struct fotg210_hcd *fotg210; - - if (usb_disabled()) - return -ENODEV; - - pdev->dev.power.power_state = PMSG_ON; - - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!res) { - dev_err(dev, - "Found HC with no IRQ. Check %s setup!\n", - dev_name(dev)); - return -ENODEV; - } - - irq = res->start; - - hcd = usb_create_hcd(&fotg210_fotg210_hc_driver, dev, - dev_name(dev)); - if (!hcd) { - dev_err(dev, "failed to create hcd with err %d\n", retval); - retval = -ENOMEM; - goto fail_create_hcd; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(dev, - "Found HC with no register addr. Check %s setup!\n", - dev_name(dev)); - retval = -ENODEV; - goto fail_request_resource; - } - - hcd->rsrc_start = res->start; - hcd->rsrc_len = resource_size(res); - hcd->has_tt = 1; - - if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, - fotg210_fotg210_hc_driver.description)) { - dev_dbg(dev, "controller already in use\n"); - retval = -EBUSY; - goto fail_request_resource; - } - - res = platform_get_resource(pdev, IORESOURCE_IO, 0); - if (!res) { - dev_err(dev, - "Found HC with no register addr. Check %s setup!\n", - dev_name(dev)); - retval = -ENODEV; - goto fail_request_resource; - } - - hcd->regs = ioremap_nocache(res->start, resource_size(res)); - if (hcd->regs == NULL) { - dev_dbg(dev, "error mapping memory\n"); - retval = -EFAULT; - goto fail_ioremap; - } - - fotg210 = hcd_to_fotg210(hcd); - - fotg210->caps = hcd->regs; - - retval = fotg210_setup(hcd); - if (retval) - goto fail_add_hcd; - - fotg210_init(fotg210); - - retval = usb_add_hcd(hcd, irq, IRQF_SHARED); - if (retval) { - dev_err(dev, "failed to add hcd with err %d\n", retval); - goto fail_add_hcd; - } - - return retval; - -fail_add_hcd: - iounmap(hcd->regs); -fail_ioremap: - release_mem_region(hcd->rsrc_start, hcd->rsrc_len); -fail_request_resource: - usb_put_hcd(hcd); -fail_create_hcd: - dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval); - return retval; -} - -/** - * fotg210_hcd_remove - shutdown processing for EHCI HCDs - * @dev: USB Host Controller being removed - * - */ -static int fotg210_hcd_remove(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct usb_hcd *hcd = dev_get_drvdata(dev); - - if (!hcd) - return 0; - - usb_remove_hcd(hcd); - iounmap(hcd->regs); - release_mem_region(hcd->rsrc_start, hcd->rsrc_len); - usb_put_hcd(hcd); - - return 0; -} - -static struct platform_driver fotg210_hcd_driver = { - .driver = { - .name = "fotg210-hcd", - }, - .probe = fotg210_hcd_probe, - .remove = fotg210_hcd_remove, -}; - -static int __init fotg210_hcd_init(void) -{ - int retval = 0; - - if (usb_disabled()) - return -ENODEV; - - pr_info("%s: " DRIVER_DESC "\n", hcd_name); - set_bit(USB_EHCI_LOADED, &usb_hcds_loaded); - if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) || - test_bit(USB_OHCI_LOADED, &usb_hcds_loaded)) - pr_warn(KERN_WARNING "Warning! fotg210_hcd should always be loaded before uhci_hcd and ohci_hcd, not after\n"); - - pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n", - hcd_name, - sizeof(struct fotg210_qh), sizeof(struct fotg210_qtd), - sizeof(struct fotg210_itd)); - -#ifdef DEBUG - fotg210_debug_root = debugfs_create_dir("fotg210", usb_debug_root); - if (!fotg210_debug_root) { - retval = -ENOENT; - goto err_debug; - } -#endif - - retval = platform_driver_register(&fotg210_hcd_driver); - if (retval < 0) - goto clean; - return retval; - - platform_driver_unregister(&fotg210_hcd_driver); -clean: -#ifdef DEBUG - debugfs_remove(fotg210_debug_root); - fotg210_debug_root = NULL; -err_debug: -#endif - clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); - return retval; -} -module_init(fotg210_hcd_init); - -static void __exit fotg210_hcd_cleanup(void) -{ - platform_driver_unregister(&fotg210_hcd_driver); -#ifdef DEBUG - debugfs_remove(fotg210_debug_root); -#endif - clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded); -} -module_exit(fotg210_hcd_cleanup); |