blob: 42936f16df027f5dee9ee7fd25d5fa8eb5e05b34 [file] [log] [blame]
/* Copyright (c) 2010-2018, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/usb/msm_hsusb_hw.h>
#include <linux/usb/ulpi.h>
#include <linux/gpio.h>
#include <linux/pinctrl/consumer.h>
#include "ci13xxx_udc.c"
#define MSM_USB_BASE (udc->regs)
#define CI13XXX_MSM_MAX_LOG2_ITC 7
struct ci13xxx_udc_context {
int irq;
void __iomem *regs;
int wake_gpio;
int wake_irq;
bool wake_irq_state;
struct pinctrl *ci13xxx_pinctrl;
struct timer_list irq_enable_timer;
bool irq_disabled;
};
static struct ci13xxx_udc_context _udc_ctxt;
#define IRQ_ENABLE_DELAY (jiffies + msecs_to_jiffies(1000))
static irqreturn_t msm_udc_irq(int irq, void *data)
{
return udc_irq();
}
static void ci13xxx_msm_suspend(void)
{
struct device *dev = _udc->gadget.dev.parent;
dev_dbg(dev, "ci13xxx_msm_suspend\n");
if (_udc_ctxt.wake_irq && !_udc_ctxt.wake_irq_state) {
enable_irq_wake(_udc_ctxt.wake_irq);
enable_irq(_udc_ctxt.wake_irq);
_udc_ctxt.wake_irq_state = true;
}
}
static void ci13xxx_msm_resume(void)
{
struct device *dev = _udc->gadget.dev.parent;
dev_dbg(dev, "ci13xxx_msm_resume\n");
if (_udc_ctxt.wake_irq && _udc_ctxt.wake_irq_state) {
disable_irq_wake(_udc_ctxt.wake_irq);
disable_irq_nosync(_udc_ctxt.wake_irq);
_udc_ctxt.wake_irq_state = false;
}
}
static void ci13xxx_msm_disconnect(void)
{
struct ci13xxx *udc = _udc;
struct usb_phy *phy = udc->transceiver;
if (phy && (phy->flags & ENABLE_DP_MANUAL_PULLUP)) {
usb_phy_io_write(phy,
ULPI_MISC_A_VBUSVLDEXT |
ULPI_MISC_A_VBUSVLDEXTSEL,
ULPI_CLR(ULPI_MISC_A));
/*
* Add memory barrier as it is must to complete
* above USB PHY and Link register writes before
* moving ahead with USB peripheral mode enumeration,
* otherwise USB peripheral mode may not work.
*/
mb();
}
}
/* Link power management will reduce power consumption by
* short time HW suspend/resume.
*/
static void ci13xxx_msm_set_l1(struct ci13xxx *udc)
{
int temp;
struct device *dev = udc->gadget.dev.parent;
dev_dbg(dev, "Enable link power management\n");
/* Enable remote wakeup and L1 for IN EPs */
writel_relaxed(0xffff0000, USB_L1_EP_CTRL);
temp = readl_relaxed(USB_L1_CONFIG);
temp |= L1_CONFIG_LPM_EN | L1_CONFIG_REMOTE_WAKEUP |
L1_CONFIG_GATE_SYS_CLK | L1_CONFIG_PHY_LPM |
L1_CONFIG_PLL;
writel_relaxed(temp, USB_L1_CONFIG);
}
static void ci13xxx_msm_connect(void)
{
struct ci13xxx *udc = _udc;
struct usb_phy *phy = udc->transceiver;
if (phy && (phy->flags & ENABLE_DP_MANUAL_PULLUP)) {
int temp;
usb_phy_io_write(phy,
ULPI_MISC_A_VBUSVLDEXT |
ULPI_MISC_A_VBUSVLDEXTSEL,
ULPI_SET(ULPI_MISC_A));
temp = readl_relaxed(USB_GENCONFIG_2);
temp |= GENCONFIG_2_SESS_VLD_CTRL_EN;
writel_relaxed(temp, USB_GENCONFIG_2);
temp = readl_relaxed(USB_USBCMD);
temp |= USBCMD_SESS_VLD_CTRL;
writel_relaxed(temp, USB_USBCMD);
/*
* Add memory barrier as it is must to complete
* above USB PHY and Link register writes before
* moving ahead with USB peripheral mode enumeration,
* otherwise USB peripheral mode may not work.
*/
mb();
}
}
static void ci13xxx_msm_reset(void)
{
struct ci13xxx *udc = _udc;
struct usb_phy *phy = udc->transceiver;
struct device *dev = udc->gadget.dev.parent;
int temp;
writel_relaxed(0, USB_AHBBURST);
writel_relaxed(0x08, USB_AHBMODE);
/* workaround for rx buffer collision issue */
temp = readl_relaxed(USB_GENCONFIG);
temp &= ~GENCONFIG_TXFIFO_IDLE_FORCE_DISABLE;
temp &= ~GENCONFIG_ULPI_SERIAL_EN;
writel_relaxed(temp, USB_GENCONFIG);
if (udc->gadget.l1_supported)
ci13xxx_msm_set_l1(udc);
if (phy && (phy->flags & ENABLE_SECONDARY_PHY)) {
int temp;
dev_dbg(dev, "using secondary hsphy\n");
temp = readl_relaxed(USB_PHY_CTRL2);
temp |= (1<<16);
writel_relaxed(temp, USB_PHY_CTRL2);
/*
* Add memory barrier to make sure above LINK writes are
* complete before moving ahead with USB peripheral mode
* enumeration.
*/
mb();
}
}
static void ci13xxx_msm_mark_err_event(void)
{
struct ci13xxx *udc = _udc;
struct msm_otg *otg;
if (udc == NULL)
return;
if (udc->transceiver == NULL)
return;
otg = container_of(udc->transceiver, struct msm_otg, phy);
/* This will trigger hardware reset before next connection */
otg->err_event_seen = true;
}
static void ci13xxx_msm_notify_event(struct ci13xxx *udc, unsigned int event)
{
struct device *dev = udc->gadget.dev.parent;
switch (event) {
case CI13XXX_CONTROLLER_RESET_EVENT:
dev_info(dev, "CI13XXX_CONTROLLER_RESET_EVENT received\n");
ci13xxx_msm_reset();
break;
case CI13XXX_CONTROLLER_DISCONNECT_EVENT:
dev_info(dev, "CI13XXX_CONTROLLER_DISCONNECT_EVENT received\n");
ci13xxx_msm_disconnect();
ci13xxx_msm_resume();
break;
case CI13XXX_CONTROLLER_CONNECT_EVENT:
dev_info(dev, "CI13XXX_CONTROLLER_CONNECT_EVENT received\n");
ci13xxx_msm_connect();
break;
case CI13XXX_CONTROLLER_SUSPEND_EVENT:
dev_info(dev, "CI13XXX_CONTROLLER_SUSPEND_EVENT received\n");
ci13xxx_msm_suspend();
break;
case CI13XXX_CONTROLLER_RESUME_EVENT:
dev_info(dev, "CI13XXX_CONTROLLER_RESUME_EVENT received\n");
ci13xxx_msm_resume();
break;
case CI13XXX_CONTROLLER_ERROR_EVENT:
dev_info(dev, "CI13XXX_CONTROLLER_ERROR_EVENT received\n");
ci13xxx_msm_mark_err_event();
break;
case CI13XXX_CONTROLLER_UDC_STARTED_EVENT:
dev_info(dev,
"CI13XXX_CONTROLLER_UDC_STARTED_EVENT received\n");
break;
default:
dev_dbg(dev, "unknown ci13xxx_udc event\n");
break;
}
}
static bool ci13xxx_msm_in_lpm(struct ci13xxx *udc)
{
struct msm_otg *otg;
if (udc == NULL)
return false;
if (udc->transceiver == NULL)
return false;
otg = container_of(udc->transceiver, struct msm_otg, phy);
return (atomic_read(&otg->in_lpm) != 0);
}
static irqreturn_t ci13xxx_msm_resume_irq(int irq, void *data)
{
struct ci13xxx *udc = _udc;
if (udc->transceiver && udc->vbus_active && udc->suspended)
usb_phy_set_suspend(udc->transceiver, 0);
else if (!udc->suspended)
ci13xxx_msm_resume();
return IRQ_HANDLED;
}
static struct ci13xxx_udc_driver ci13xxx_msm_udc_driver = {
.name = "ci13xxx_msm",
.flags = CI13XXX_REGS_SHARED |
CI13XXX_REQUIRE_TRANSCEIVER |
CI13XXX_PULLUP_ON_VBUS |
CI13XXX_ZERO_ITC |
CI13XXX_DISABLE_STREAMING,
.nz_itc = 0,
.notify_event = ci13xxx_msm_notify_event,
.in_lpm = ci13xxx_msm_in_lpm,
};
static int ci13xxx_msm_install_wake_gpio(struct platform_device *pdev,
struct resource *res)
{
int wake_irq;
int ret;
struct pinctrl_state *set_state;
dev_dbg(&pdev->dev, "ci13xxx_msm_install_wake_gpio\n");
_udc_ctxt.wake_gpio = res->start;
if (_udc_ctxt.ci13xxx_pinctrl) {
set_state = pinctrl_lookup_state(_udc_ctxt.ci13xxx_pinctrl,
"ci13xxx_active");
if (IS_ERR(set_state)) {
pr_err("cannot get ci13xxx pinctrl active state\n");
return PTR_ERR(set_state);
}
pinctrl_select_state(_udc_ctxt.ci13xxx_pinctrl, set_state);
}
gpio_request(_udc_ctxt.wake_gpio, "USB_RESUME");
gpio_direction_input(_udc_ctxt.wake_gpio);
wake_irq = gpio_to_irq(_udc_ctxt.wake_gpio);
if (wake_irq < 0) {
dev_err(&pdev->dev, "could not register USB_RESUME GPIO.\n");
return -ENXIO;
}
dev_dbg(&pdev->dev, "_udc_ctxt.gpio_irq = %d and irq = %d\n",
_udc_ctxt.wake_gpio, wake_irq);
ret = request_irq(wake_irq, ci13xxx_msm_resume_irq,
IRQF_TRIGGER_RISING | IRQF_ONESHOT, "usb resume", NULL);
if (ret < 0) {
dev_err(&pdev->dev, "could not register USB_RESUME IRQ.\n");
goto gpio_free;
}
disable_irq(wake_irq);
_udc_ctxt.wake_irq = wake_irq;
return 0;
gpio_free:
gpio_free(_udc_ctxt.wake_gpio);
if (_udc_ctxt.ci13xxx_pinctrl) {
set_state = pinctrl_lookup_state(_udc_ctxt.ci13xxx_pinctrl,
"ci13xxx_sleep");
if (IS_ERR(set_state))
pr_err("cannot get ci13xxx pinctrl sleep state\n");
else
pinctrl_select_state(_udc_ctxt.ci13xxx_pinctrl,
set_state);
}
_udc_ctxt.wake_gpio = 0;
return ret;
}
static void ci13xxx_msm_uninstall_wake_gpio(struct platform_device *pdev)
{
struct pinctrl_state *set_state;
dev_dbg(&pdev->dev, "ci13xxx_msm_uninstall_wake_gpio\n");
if (_udc_ctxt.wake_gpio) {
gpio_free(_udc_ctxt.wake_gpio);
if (_udc_ctxt.ci13xxx_pinctrl) {
set_state =
pinctrl_lookup_state(_udc_ctxt.ci13xxx_pinctrl,
"ci13xxx_sleep");
if (IS_ERR(set_state))
pr_err("cannot get ci13xxx pinctrl sleep state\n");
else
pinctrl_select_state(_udc_ctxt.ci13xxx_pinctrl,
set_state);
}
_udc_ctxt.wake_gpio = 0;
}
}
static void enable_usb_irq_timer_func(unsigned long data);
static int ci13xxx_msm_probe(struct platform_device *pdev)
{
struct resource *res;
int ret;
struct ci13xxx_platform_data *pdata = pdev->dev.platform_data;
bool is_l1_supported = false;
dev_dbg(&pdev->dev, "ci13xxx_msm_probe\n");
if (pdata) {
/* Acceptable values for nz_itc are: 0,1,2,4,8,16,32,64 */
if (pdata->log2_itc > CI13XXX_MSM_MAX_LOG2_ITC ||
pdata->log2_itc <= 0)
ci13xxx_msm_udc_driver.nz_itc = 0;
else
ci13xxx_msm_udc_driver.nz_itc =
1 << (pdata->log2_itc-1);
is_l1_supported = pdata->l1_supported;
/* Set ahb2ahb bypass flag if it is requested. */
if (pdata->enable_ahb2ahb_bypass)
ci13xxx_msm_udc_driver.flags |=
CI13XXX_ENABLE_AHB2AHB_BYPASS;
/* Clear disable streaming flag if is requested. */
if (pdata->enable_streaming)
ci13xxx_msm_udc_driver.flags &=
~CI13XXX_DISABLE_STREAMING;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get platform resource mem\n");
return -ENXIO;
}
_udc_ctxt.regs = ioremap(res->start, resource_size(res));
if (!_udc_ctxt.regs) {
dev_err(&pdev->dev, "ioremap failed\n");
return -ENOMEM;
}
ret = udc_probe(&ci13xxx_msm_udc_driver, &pdev->dev, _udc_ctxt.regs);
if (ret < 0) {
dev_err(&pdev->dev, "udc_probe failed\n");
goto iounmap;
}
_udc->gadget.l1_supported = is_l1_supported;
_udc_ctxt.irq = platform_get_irq(pdev, 0);
if (_udc_ctxt.irq < 0) {
dev_err(&pdev->dev, "IRQ not found\n");
ret = -ENXIO;
goto udc_remove;
}
res = platform_get_resource_byname(pdev, IORESOURCE_IO, "USB_RESUME");
/* Get pinctrl if target uses pinctrl */
_udc_ctxt.ci13xxx_pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(_udc_ctxt.ci13xxx_pinctrl)) {
if (of_property_read_bool(pdev->dev.of_node, "pinctrl-names")) {
dev_err(&pdev->dev, "Error encountered while getting pinctrl");
ret = PTR_ERR(_udc_ctxt.ci13xxx_pinctrl);
goto udc_remove;
}
dev_dbg(&pdev->dev, "Target does not use pinctrl\n");
_udc_ctxt.ci13xxx_pinctrl = NULL;
}
if (res) {
ret = ci13xxx_msm_install_wake_gpio(pdev, res);
if (ret < 0) {
dev_err(&pdev->dev, "gpio irq install failed\n");
goto udc_remove;
}
}
ret = request_irq(_udc_ctxt.irq, msm_udc_irq, IRQF_SHARED, pdev->name,
pdev);
if (ret < 0) {
dev_err(&pdev->dev, "request_irq failed\n");
goto gpio_uninstall;
}
setup_timer(&_udc_ctxt.irq_enable_timer, enable_usb_irq_timer_func,
(unsigned long)NULL);
pm_runtime_no_callbacks(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
gpio_uninstall:
ci13xxx_msm_uninstall_wake_gpio(pdev);
udc_remove:
udc_remove();
iounmap:
iounmap(_udc_ctxt.regs);
return ret;
}
int ci13xxx_msm_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
free_irq(_udc_ctxt.irq, pdev);
ci13xxx_msm_uninstall_wake_gpio(pdev);
udc_remove();
iounmap(_udc_ctxt.regs);
return 0;
}
void ci13xxx_msm_shutdown(struct platform_device *pdev)
{
ci13xxx_pullup(&_udc->gadget, 0);
}
void msm_hw_soft_reset(void)
{
struct ci13xxx *udc = _udc;
hw_device_reset(udc);
}
void msm_hw_bam_disable(bool bam_disable)
{
u32 val;
struct ci13xxx *udc = _udc;
if (bam_disable)
val = readl_relaxed(USB_GENCONFIG) | GENCONFIG_BAM_DISABLE;
else
val = readl_relaxed(USB_GENCONFIG) & ~GENCONFIG_BAM_DISABLE;
writel_relaxed(val, USB_GENCONFIG);
}
void msm_usb_irq_disable(bool disable)
{
struct ci13xxx *udc = _udc;
unsigned long flags;
spin_lock_irqsave(udc->lock, flags);
if (_udc_ctxt.irq_disabled == disable) {
pr_debug("Interrupt state already disable = %d\n", disable);
if (disable)
mod_timer(&_udc_ctxt.irq_enable_timer,
IRQ_ENABLE_DELAY);
spin_unlock_irqrestore(udc->lock, flags);
return;
}
if (disable) {
disable_irq_nosync(_udc_ctxt.irq);
/* start timer here */
pr_debug("%s: Disabling interrupts\n", __func__);
mod_timer(&_udc_ctxt.irq_enable_timer, IRQ_ENABLE_DELAY);
_udc_ctxt.irq_disabled = true;
} else {
pr_debug("%s: Enabling interrupts\n", __func__);
del_timer(&_udc_ctxt.irq_enable_timer);
enable_irq(_udc_ctxt.irq);
_udc_ctxt.irq_disabled = false;
}
spin_unlock_irqrestore(udc->lock, flags);
}
static void enable_usb_irq_timer_func(unsigned long data)
{
pr_debug("enabling interrupt from timer\n");
msm_usb_irq_disable(false);
}
static struct platform_driver ci13xxx_msm_driver = {
.probe = ci13xxx_msm_probe,
.driver = {
.name = "msm_hsusb",
},
.remove = ci13xxx_msm_remove,
.shutdown = ci13xxx_msm_shutdown,
};
MODULE_ALIAS("platform:msm_hsusb");
static int __init ci13xxx_msm_init(void)
{
return platform_driver_register(&ci13xxx_msm_driver);
}
module_init(ci13xxx_msm_init);
static void __exit ci13xxx_msm_exit(void)
{
platform_driver_unregister(&ci13xxx_msm_driver);
}
module_exit(ci13xxx_msm_exit);
MODULE_LICENSE("GPL v2");