diff options
Diffstat (limited to 'arch/mips/kernel/rtlx.c')
| -rw-r--r-- | arch/mips/kernel/rtlx.c | 273 |
1 files changed, 62 insertions, 211 deletions
diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c index 2c12ea1668d1..31b1b763cb29 100644 --- a/arch/mips/kernel/rtlx.c +++ b/arch/mips/kernel/rtlx.c @@ -1,114 +1,51 @@ /* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. * Copyright (C) 2005, 06 Ralf Baechle (ralf@linux-mips.org) - * - * This program is free software; you can distribute it and/or modify it - * under the terms of the GNU General Public License (Version 2) as - * published by the Free Software Foundation. - * - * This program is distributed in the hope 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., - * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. - * + * Copyright (C) 2013 Imagination Technologies Ltd. */ - -#include <linux/device.h> #include <linux/kernel.h> #include <linux/fs.h> -#include <linux/init.h> -#include <asm/uaccess.h> -#include <linux/list.h> -#include <linux/vmalloc.h> -#include <linux/elf.h> -#include <linux/seq_file.h> #include <linux/syscalls.h> #include <linux/moduleloader.h> -#include <linux/interrupt.h> -#include <linux/poll.h> -#include <linux/sched.h> -#include <linux/wait.h> +#include <linux/atomic.h> #include <asm/mipsmtregs.h> #include <asm/mips_mt.h> -#include <asm/cacheflush.h> -#include <linux/atomic.h> -#include <asm/cpu.h> #include <asm/processor.h> -#include <asm/vpe.h> #include <asm/rtlx.h> #include <asm/setup.h> +#include <asm/vpe.h> -static struct rtlx_info *rtlx; -static int major; -static char module_name[] = "rtlx"; - -static struct chan_waitqueues { - wait_queue_head_t rt_queue; - wait_queue_head_t lx_queue; - atomic_t in_open; - struct mutex mutex; -} channel_wqs[RTLX_CHANNELS]; - -static struct vpe_notifications notify; static int sp_stopping; - -extern void *vpe_get_shared(int index); - -static void rtlx_dispatch(void) -{ - do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ); -} - - -/* Interrupt handler may be called before rtlx_init has otherwise had - a chance to run. -*/ -static irqreturn_t rtlx_interrupt(int irq, void *dev_id) -{ - unsigned int vpeflags; - unsigned long flags; - int i; - - /* Ought not to be strictly necessary for SMTC builds */ - local_irq_save(flags); - vpeflags = dvpe(); - set_c0_status(0x100 << MIPS_CPU_RTLX_IRQ); - irq_enable_hazard(); - evpe(vpeflags); - local_irq_restore(flags); - - for (i = 0; i < RTLX_CHANNELS; i++) { - wake_up(&channel_wqs[i].lx_queue); - wake_up(&channel_wqs[i].rt_queue); - } - - return IRQ_HANDLED; -} +struct rtlx_info *rtlx; +struct chan_waitqueues channel_wqs[RTLX_CHANNELS]; +struct vpe_notifications rtlx_notify; +void (*aprp_hook)(void) = NULL; +EXPORT_SYMBOL(aprp_hook); static void __used dump_rtlx(void) { int i; - printk("id 0x%lx state %d\n", rtlx->id, rtlx->state); + pr_info("id 0x%lx state %d\n", rtlx->id, rtlx->state); for (i = 0; i < RTLX_CHANNELS; i++) { struct rtlx_channel *chan = &rtlx->channel[i]; - printk(" rt_state %d lx_state %d buffer_size %d\n", - chan->rt_state, chan->lx_state, chan->buffer_size); + pr_info(" rt_state %d lx_state %d buffer_size %d\n", + chan->rt_state, chan->lx_state, chan->buffer_size); - printk(" rt_read %d rt_write %d\n", - chan->rt_read, chan->rt_write); + pr_info(" rt_read %d rt_write %d\n", + chan->rt_read, chan->rt_write); - printk(" lx_read %d lx_write %d\n", - chan->lx_read, chan->lx_write); + pr_info(" lx_read %d lx_write %d\n", + chan->lx_read, chan->lx_write); - printk(" rt_buffer <%s>\n", chan->rt_buffer); - printk(" lx_buffer <%s>\n", chan->lx_buffer); + pr_info(" rt_buffer <%s>\n", chan->rt_buffer); + pr_info(" lx_buffer <%s>\n", chan->lx_buffer); } } @@ -116,8 +53,7 @@ static void __used dump_rtlx(void) static int rtlx_init(struct rtlx_info *rtlxi) { if (rtlxi->id != RTLX_ID) { - printk(KERN_ERR "no valid RTLX id at 0x%p 0x%lx\n", - rtlxi, rtlxi->id); + pr_err("no valid RTLX id at 0x%p 0x%lx\n", rtlxi, rtlxi->id); return -ENOEXEC; } @@ -127,20 +63,20 @@ static int rtlx_init(struct rtlx_info *rtlxi) } /* notifications */ -static void starting(int vpe) +void rtlx_starting(int vpe) { int i; sp_stopping = 0; /* force a reload of rtlx */ - rtlx=NULL; + rtlx = NULL; /* wake up any sleeping rtlx_open's */ for (i = 0; i < RTLX_CHANNELS; i++) wake_up_interruptible(&channel_wqs[i].lx_queue); } -static void stopping(int vpe) +void rtlx_stopping(int vpe) { int i; @@ -158,31 +94,30 @@ int rtlx_open(int index, int can_sleep) int ret = 0; if (index >= RTLX_CHANNELS) { - printk(KERN_DEBUG "rtlx_open index out of range\n"); + pr_debug(KERN_DEBUG "rtlx_open index out of range\n"); return -ENOSYS; } if (atomic_inc_return(&channel_wqs[index].in_open) > 1) { - printk(KERN_DEBUG "rtlx_open channel %d already opened\n", - index); + pr_debug(KERN_DEBUG "rtlx_open channel %d already opened\n", index); ret = -EBUSY; goto out_fail; } if (rtlx == NULL) { - if( (p = vpe_get_shared(tclimit)) == NULL) { - if (can_sleep) { - ret = __wait_event_interruptible( + p = vpe_get_shared(aprp_cpu_index()); + if (p == NULL) { + if (can_sleep) { + ret = __wait_event_interruptible( channel_wqs[index].lx_queue, - (p = vpe_get_shared(tclimit))); - if (ret) + (p = vpe_get_shared(aprp_cpu_index()))); + if (ret) + goto out_fail; + } else { + pr_debug("No SP program loaded, and device opened with O_NONBLOCK\n"); + ret = -ENOSYS; goto out_fail; - } else { - printk(KERN_DEBUG "No SP program loaded, and device " - "opened with O_NONBLOCK\n"); - ret = -ENOSYS; - goto out_fail; - } + } } smp_rmb(); @@ -204,24 +139,24 @@ int rtlx_open(int index, int can_sleep) ret = -ERESTARTSYS; goto out_fail; } - finish_wait(&channel_wqs[index].lx_queue, &wait); + finish_wait(&channel_wqs[index].lx_queue, + &wait); } else { - pr_err(" *vpe_get_shared is NULL. " - "Has an SP program been loaded?\n"); + pr_err(" *vpe_get_shared is NULL. Has an SP program been loaded?\n"); ret = -ENOSYS; goto out_fail; } } if ((unsigned int)*p < KSEG0) { - printk(KERN_WARNING "vpe_get_shared returned an " - "invalid pointer maybe an error code %d\n", - (int)*p); + pr_warn("vpe_get_shared returned an invalid pointer maybe an error code %d\n", + (int)*p); ret = -ENOSYS; goto out_fail; } - if ((ret = rtlx_init(*p)) < 0) + ret = rtlx_init(*p); + if (ret < 0) goto out_ret; } @@ -352,7 +287,7 @@ ssize_t rtlx_write(int index, const void __user *buffer, size_t count) size_t fl; if (rtlx == NULL) - return(-ENOSYS); + return -ENOSYS; rt = &rtlx->channel[index]; @@ -361,8 +296,8 @@ ssize_t rtlx_write(int index, const void __user *buffer, size_t count) rt_read = rt->rt_read; /* total number of bytes to copy */ - count = min(count, (size_t)write_spacefree(rt_read, rt->rt_write, - rt->buffer_size)); + count = min_t(size_t, count, write_spacefree(rt_read, rt->rt_write, + rt->buffer_size)); /* first bit from write pointer to the end of the buffer, or count */ fl = min(count, (size_t) rt->buffer_size - rt->rt_write); @@ -372,9 +307,8 @@ ssize_t rtlx_write(int index, const void __user *buffer, size_t count) goto out; /* if there's any left copy to the beginning of the buffer */ - if (count - fl) { + if (count - fl) failed = copy_from_user(rt->rt_buffer, buffer + fl, count - fl); - } out: count -= failed; @@ -384,6 +318,8 @@ out: smp_wmb(); mutex_unlock(&channel_wqs[index].mutex); + _interrupt_sp(); + return count; } @@ -398,7 +334,7 @@ static int file_release(struct inode *inode, struct file *filp) return rtlx_release(iminor(inode)); } -static unsigned int file_poll(struct file *file, poll_table * wait) +static unsigned int file_poll(struct file *file, poll_table *wait) { int minor = iminor(file_inode(file)); unsigned int mask = 0; @@ -420,21 +356,20 @@ static unsigned int file_poll(struct file *file, poll_table * wait) return mask; } -static ssize_t file_read(struct file *file, char __user * buffer, size_t count, - loff_t * ppos) +static ssize_t file_read(struct file *file, char __user *buffer, size_t count, + loff_t *ppos) { int minor = iminor(file_inode(file)); /* data available? */ - if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) { - return 0; // -EAGAIN makes cat whinge - } + if (!rtlx_read_poll(minor, (file->f_flags & O_NONBLOCK) ? 0 : 1)) + return 0; /* -EAGAIN makes 'cat' whine */ return rtlx_read(minor, buffer, count); } -static ssize_t file_write(struct file *file, const char __user * buffer, - size_t count, loff_t * ppos) +static ssize_t file_write(struct file *file, const char __user *buffer, + size_t count, loff_t *ppos) { int minor = iminor(file_inode(file)); @@ -454,100 +389,16 @@ static ssize_t file_write(struct file *file, const char __user * buffer, return rtlx_write(minor, buffer, count); } -static const struct file_operations rtlx_fops = { +const struct file_operations rtlx_fops = { .owner = THIS_MODULE, - .open = file_open, + .open = file_open, .release = file_release, .write = file_write, - .read = file_read, - .poll = file_poll, + .read = file_read, + .poll = file_poll, .llseek = noop_llseek, }; -static struct irqaction rtlx_irq = { - .handler = rtlx_interrupt, - .name = "RTLX", -}; - -static int rtlx_irq_num = MIPS_CPU_IRQ_BASE + MIPS_CPU_RTLX_IRQ; - -static char register_chrdev_failed[] __initdata = - KERN_ERR "rtlx_module_init: unable to register device\n"; - -static int __init rtlx_module_init(void) -{ - struct device *dev; - int i, err; - - if (!cpu_has_mipsmt) { - printk("VPE loader: not a MIPS MT capable processor\n"); - return -ENODEV; - } - - if (tclimit == 0) { - printk(KERN_WARNING "No TCs reserved for AP/SP, not " - "initializing RTLX.\nPass maxtcs=<n> argument as kernel " - "argument\n"); - - return -ENODEV; - } - - major = register_chrdev(0, module_name, &rtlx_fops); - if (major < 0) { - printk(register_chrdev_failed); - return major; - } - - /* initialise the wait queues */ - for (i = 0; i < RTLX_CHANNELS; i++) { - init_waitqueue_head(&channel_wqs[i].rt_queue); - init_waitqueue_head(&channel_wqs[i].lx_queue); - atomic_set(&channel_wqs[i].in_open, 0); - mutex_init(&channel_wqs[i].mutex); - - dev = device_create(mt_class, NULL, MKDEV(major, i), NULL, - "%s%d", module_name, i); - if (IS_ERR(dev)) { - err = PTR_ERR(dev); - goto out_chrdev; - } - } - - /* set up notifiers */ - notify.start = starting; - notify.stop = stopping; - vpe_notify(tclimit, ¬ify); - - if (cpu_has_vint) - set_vi_handler(MIPS_CPU_RTLX_IRQ, rtlx_dispatch); - else { - pr_err("APRP RTLX init on non-vectored-interrupt processor\n"); - err = -ENODEV; - goto out_chrdev; - } - - rtlx_irq.dev_id = rtlx; - setup_irq(rtlx_irq_num, &rtlx_irq); - - return 0; - -out_chrdev: - for (i = 0; i < RTLX_CHANNELS; i++) - device_destroy(mt_class, MKDEV(major, i)); - - return err; -} - -static void __exit rtlx_module_exit(void) -{ - int i; - - for (i = 0; i < RTLX_CHANNELS; i++) - device_destroy(mt_class, MKDEV(major, i)); - - unregister_chrdev(major, module_name); -} - module_init(rtlx_module_init); module_exit(rtlx_module_exit); |