summaryrefslogtreecommitdiff
path: root/drivers/usb/chipidea/core.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/chipidea/core.c')
-rw-r--r--drivers/usb/chipidea/core.c474
1 files changed, 474 insertions, 0 deletions
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
new file mode 100644
index 000000000000..15e03b308f8a
--- /dev/null
+++ b/drivers/usb/chipidea/core.c
@@ -0,0 +1,474 @@
+/*
+ * core.c - ChipIdea USB IP core family device controller
+ *
+ * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
+ *
+ * Author: David Lopo
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Description: ChipIdea USB IP core family device controller
+ *
+ * This driver is composed of several blocks:
+ * - HW: hardware interface
+ * - DBG: debug facilities (optional)
+ * - UTIL: utilities
+ * - ISR: interrupts handling
+ * - ENDPT: endpoint operations (Gadget API)
+ * - GADGET: gadget operations (Gadget API)
+ * - BUS: bus glue code, bus abstraction layer
+ *
+ * Compile Options
+ * - CONFIG_USB_GADGET_DEBUG_FILES: enable debug facilities
+ * - STALL_IN: non-empty bulk-in pipes cannot be halted
+ * if defined mass storage compliance succeeds but with warnings
+ * => case 4: Hi > Dn
+ * => case 5: Hi > Di
+ * => case 8: Hi <> Do
+ * if undefined usbtest 13 fails
+ * - TRACE: enable function tracing (depends on DEBUG)
+ *
+ * Main Features
+ * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
+ * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
+ * - Normal & LPM support
+ *
+ * USBTEST Report
+ * - OK: 0-12, 13 (STALL_IN defined) & 14
+ * - Not Supported: 15 & 16 (ISO)
+ *
+ * TODO List
+ * - OTG
+ * - Isochronous & Interrupt Traffic
+ * - Handle requests which spawns into several TDs
+ * - GET_STATUS(device) - always reports 0
+ * - Gadget API (majority of optional features)
+ * - Suspend & Remote Wakeup
+ */
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/chipidea.h>
+
+#include "ci.h"
+#include "udc.h"
+#include "bits.h"
+#include "host.h"
+#include "debug.h"
+
+/* Controller register map */
+static uintptr_t ci_regs_nolpm[] = {
+ [CAP_CAPLENGTH] = 0x000UL,
+ [CAP_HCCPARAMS] = 0x008UL,
+ [CAP_DCCPARAMS] = 0x024UL,
+ [CAP_TESTMODE] = 0x038UL,
+ [OP_USBCMD] = 0x000UL,
+ [OP_USBSTS] = 0x004UL,
+ [OP_USBINTR] = 0x008UL,
+ [OP_DEVICEADDR] = 0x014UL,
+ [OP_ENDPTLISTADDR] = 0x018UL,
+ [OP_PORTSC] = 0x044UL,
+ [OP_DEVLC] = 0x084UL,
+ [OP_OTGSC] = 0x064UL,
+ [OP_USBMODE] = 0x068UL,
+ [OP_ENDPTSETUPSTAT] = 0x06CUL,
+ [OP_ENDPTPRIME] = 0x070UL,
+ [OP_ENDPTFLUSH] = 0x074UL,
+ [OP_ENDPTSTAT] = 0x078UL,
+ [OP_ENDPTCOMPLETE] = 0x07CUL,
+ [OP_ENDPTCTRL] = 0x080UL,
+};
+
+static uintptr_t ci_regs_lpm[] = {
+ [CAP_CAPLENGTH] = 0x000UL,
+ [CAP_HCCPARAMS] = 0x008UL,
+ [CAP_DCCPARAMS] = 0x024UL,
+ [CAP_TESTMODE] = 0x0FCUL,
+ [OP_USBCMD] = 0x000UL,
+ [OP_USBSTS] = 0x004UL,
+ [OP_USBINTR] = 0x008UL,
+ [OP_DEVICEADDR] = 0x014UL,
+ [OP_ENDPTLISTADDR] = 0x018UL,
+ [OP_PORTSC] = 0x044UL,
+ [OP_DEVLC] = 0x084UL,
+ [OP_OTGSC] = 0x0C4UL,
+ [OP_USBMODE] = 0x0C8UL,
+ [OP_ENDPTSETUPSTAT] = 0x0D8UL,
+ [OP_ENDPTPRIME] = 0x0DCUL,
+ [OP_ENDPTFLUSH] = 0x0E0UL,
+ [OP_ENDPTSTAT] = 0x0E4UL,
+ [OP_ENDPTCOMPLETE] = 0x0E8UL,
+ [OP_ENDPTCTRL] = 0x0ECUL,
+};
+
+static int hw_alloc_regmap(struct ci13xxx *ci, bool is_lpm)
+{
+ int i;
+
+ kfree(ci->hw_bank.regmap);
+
+ ci->hw_bank.regmap = kzalloc((OP_LAST + 1) * sizeof(void *),
+ GFP_KERNEL);
+ if (!ci->hw_bank.regmap)
+ return -ENOMEM;
+
+ for (i = 0; i < OP_ENDPTCTRL; i++)
+ ci->hw_bank.regmap[i] =
+ (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
+ (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
+
+ for (; i <= OP_LAST; i++)
+ ci->hw_bank.regmap[i] = ci->hw_bank.op +
+ 4 * (i - OP_ENDPTCTRL) +
+ (is_lpm
+ ? ci_regs_lpm[OP_ENDPTCTRL]
+ : ci_regs_nolpm[OP_ENDPTCTRL]);
+
+ return 0;
+}
+
+/**
+ * hw_port_test_set: writes port test mode (execute without interruption)
+ * @mode: new value
+ *
+ * This function returns an error code
+ */
+int hw_port_test_set(struct ci13xxx *ci, u8 mode)
+{
+ const u8 TEST_MODE_MAX = 7;
+
+ if (mode > TEST_MODE_MAX)
+ return -EINVAL;
+
+ hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << ffs_nr(PORTSC_PTC));
+ return 0;
+}
+
+/**
+ * hw_port_test_get: reads port test mode value
+ *
+ * This function returns port test mode value
+ */
+u8 hw_port_test_get(struct ci13xxx *ci)
+{
+ return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> ffs_nr(PORTSC_PTC);
+}
+
+static int hw_device_init(struct ci13xxx *ci, void __iomem *base)
+{
+ u32 reg;
+
+ /* bank is a module variable */
+ ci->hw_bank.abs = base;
+
+ ci->hw_bank.cap = ci->hw_bank.abs;
+ ci->hw_bank.cap += ci->udc_driver->capoffset;
+ ci->hw_bank.op = ci->hw_bank.cap + ioread8(ci->hw_bank.cap);
+
+ hw_alloc_regmap(ci, false);
+ reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
+ ffs_nr(HCCPARAMS_LEN);
+ ci->hw_bank.lpm = reg;
+ hw_alloc_regmap(ci, !!reg);
+ ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
+ ci->hw_bank.size += OP_LAST;
+ ci->hw_bank.size /= sizeof(u32);
+
+ reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
+ ffs_nr(DCCPARAMS_DEN);
+ ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
+
+ if (ci->hw_ep_max > ENDPT_MAX)
+ return -ENODEV;
+
+ dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n",
+ ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
+
+ /* setup lock mode ? */
+
+ /* ENDPTSETUPSTAT is '0' by default */
+
+ /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
+
+ return 0;
+}
+
+/**
+ * hw_device_reset: resets chip (execute without interruption)
+ * @ci: the controller
+ *
+ * This function returns an error code
+ */
+int hw_device_reset(struct ci13xxx *ci, u32 mode)
+{
+ /* should flush & stop before reset */
+ hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
+ hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
+
+ hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
+ while (hw_read(ci, OP_USBCMD, USBCMD_RST))
+ udelay(10); /* not RTOS friendly */
+
+
+ if (ci->udc_driver->notify_event)
+ ci->udc_driver->notify_event(ci,
+ CI13XXX_CONTROLLER_RESET_EVENT);
+
+ if (ci->udc_driver->flags & CI13XXX_DISABLE_STREAMING)
+ hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
+
+ /* USBMODE should be configured step by step */
+ hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
+ hw_write(ci, OP_USBMODE, USBMODE_CM, mode);
+ /* HW >= 2.3 */
+ hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
+
+ if (hw_read(ci, OP_USBMODE, USBMODE_CM) != mode) {
+ pr_err("cannot enter in %s mode", ci_role(ci)->name);
+ pr_err("lpm = %i", ci->hw_bank.lpm);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/**
+ * ci_otg_role - pick role based on ID pin state
+ * @ci: the controller
+ */
+static enum ci_role ci_otg_role(struct ci13xxx *ci)
+{
+ u32 sts = hw_read(ci, OP_OTGSC, ~0);
+ enum ci_role role = sts & OTGSC_ID
+ ? CI_ROLE_GADGET
+ : CI_ROLE_HOST;
+
+ return role;
+}
+
+/**
+ * ci_role_work - perform role changing based on ID pin
+ * @work: work struct
+ */
+static void ci_role_work(struct work_struct *work)
+{
+ struct ci13xxx *ci = container_of(work, struct ci13xxx, work);
+ enum ci_role role = ci_otg_role(ci);
+
+ hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS);
+
+ if (role != ci->role) {
+ dev_dbg(ci->dev, "switching from %s to %s\n",
+ ci_role(ci)->name, ci->roles[role]->name);
+
+ ci_role_stop(ci);
+ ci_role_start(ci, role);
+ }
+}
+
+static ssize_t show_role(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ci13xxx *ci = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", ci_role(ci)->name);
+}
+
+static ssize_t store_role(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ci13xxx *ci = dev_get_drvdata(dev);
+ enum ci_role role;
+ int ret;
+
+ for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
+ if (ci->roles[role] && !strcmp(buf, ci->roles[role]->name))
+ break;
+
+ if (role == CI_ROLE_END || role == ci->role)
+ return -EINVAL;
+
+ ci_role_stop(ci);
+ ret = ci_role_start(ci, role);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(role, S_IRUSR | S_IWUSR, show_role, store_role);
+
+static irqreturn_t ci_irq(int irq, void *data)
+{
+ struct ci13xxx *ci = data;
+ irqreturn_t ret = IRQ_NONE;
+
+ if (ci->is_otg) {
+ u32 sts = hw_read(ci, OP_OTGSC, ~0);
+
+ if (sts & OTGSC_IDIS) {
+ queue_work(ci->wq, &ci->work);
+ ret = IRQ_HANDLED;
+ }
+ }
+
+ return ci->role == CI_ROLE_END ? ret : ci_role(ci)->irq(ci);
+}
+
+static int __devinit ci_hdrc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ci13xxx *ci;
+ struct resource *res;
+ void __iomem *base;
+ int ret;
+
+ if (!dev->platform_data) {
+ dev_err(dev, "platform data missing\n");
+ return -ENODEV;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "missing resource\n");
+ return -ENODEV;
+ }
+
+ base = devm_request_and_ioremap(dev, res);
+ if (!res) {
+ dev_err(dev, "can't request and ioremap resource\n");
+ return -ENOMEM;
+ }
+
+ ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
+ if (!ci) {
+ dev_err(dev, "can't allocate device\n");
+ return -ENOMEM;
+ }
+
+ ci->dev = dev;
+ ci->udc_driver = dev->platform_data;
+
+ ret = hw_device_init(ci, base);
+ if (ret < 0) {
+ dev_err(dev, "can't initialize hardware\n");
+ return -ENODEV;
+ }
+
+ ci->hw_bank.phys = res->start;
+
+ ci->irq = platform_get_irq(pdev, 0);
+ if (ci->irq < 0) {
+ dev_err(dev, "missing IRQ\n");
+ return -ENODEV;
+ }
+
+ INIT_WORK(&ci->work, ci_role_work);
+ ci->wq = create_singlethread_workqueue("ci_otg");
+ if (!ci->wq) {
+ dev_err(dev, "can't create workqueue\n");
+ return -ENODEV;
+ }
+
+ /* initialize role(s) before the interrupt is requested */
+ ret = ci_hdrc_host_init(ci);
+ if (ret)
+ dev_info(dev, "doesn't support host\n");
+
+ ret = ci_hdrc_gadget_init(ci);
+ if (ret)
+ dev_info(dev, "doesn't support gadget\n");
+
+ if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
+ dev_err(dev, "no supported roles\n");
+ ret = -ENODEV;
+ goto rm_wq;
+ }
+
+ if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
+ ci->is_otg = true;
+ ci->role = ci_otg_role(ci);
+ } else {
+ ci->role = ci->roles[CI_ROLE_HOST]
+ ? CI_ROLE_HOST
+ : CI_ROLE_GADGET;
+ }
+
+ ret = ci_role_start(ci, ci->role);
+ if (ret) {
+ dev_err(dev, "can't start %s role\n", ci_role(ci)->name);
+ ret = -ENODEV;
+ goto rm_wq;
+ }
+
+ platform_set_drvdata(pdev, ci);
+ ret = request_irq(ci->irq, ci_irq, IRQF_SHARED, ci->udc_driver->name,
+ ci);
+ if (ret)
+ goto stop;
+
+ ret = device_create_file(dev, &dev_attr_role);
+ if (ret)
+ goto rm_attr;
+
+ if (ci->is_otg)
+ hw_write(ci, OP_OTGSC, OTGSC_IDIE, OTGSC_IDIE);
+
+ return ret;
+
+rm_attr:
+ device_remove_file(dev, &dev_attr_role);
+stop:
+ ci_role_stop(ci);
+rm_wq:
+ flush_workqueue(ci->wq);
+ destroy_workqueue(ci->wq);
+
+ return ret;
+}
+
+static int __devexit ci_hdrc_remove(struct platform_device *pdev)
+{
+ struct ci13xxx *ci = platform_get_drvdata(pdev);
+
+ flush_workqueue(ci->wq);
+ destroy_workqueue(ci->wq);
+ device_remove_file(ci->dev, &dev_attr_role);
+ free_irq(ci->irq, ci);
+ ci_role_stop(ci);
+
+ return 0;
+}
+
+static struct platform_driver ci_hdrc_driver = {
+ .probe = ci_hdrc_probe,
+ .remove = __devexit_p(ci_hdrc_remove),
+ .driver = {
+ .name = "ci_hdrc",
+ },
+};
+
+module_platform_driver(ci_hdrc_driver);
+
+MODULE_ALIAS("platform:ci_hdrc");
+MODULE_ALIAS("platform:ci13xxx");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
+MODULE_DESCRIPTION("ChipIdea HDRC Driver");