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linux-next/drivers/usb/dwc3/dwc3-qcom.c
Arnd Bergmann 9925e6ebe5 usb: dwc3: qcom: mark PM functions as __maybe_unused
The #ifdef guards around these are wrong, resulting in warnings
in certain configurations:

drivers/usb/dwc3/dwc3-qcom.c:244:12: error: 'dwc3_qcom_resume' defined but not used [-Werror=unused-function]
 static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
            ^~~~~~~~~~~~~~~~
drivers/usb/dwc3/dwc3-qcom.c:223:12: error: 'dwc3_qcom_suspend' defined but not used [-Werror=unused-function]
 static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)

This replaces the guards with __maybe_unused annotations to shut up
the warnings and give better compile time coverage.

Fixes: a4333c3a6b ("usb: dwc3: Add Qualcomm DWC3 glue driver")
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2018-06-19 12:48:12 +03:00

617 lines
14 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
*
* Inspired by dwc3-of-simple.c
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/extcon.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/usb/of.h>
#include <linux/reset.h>
#include <linux/iopoll.h>
#include "core.h"
/* USB QSCRATCH Hardware registers */
#define QSCRATCH_HS_PHY_CTRL 0x10
#define UTMI_OTG_VBUS_VALID BIT(20)
#define SW_SESSVLD_SEL BIT(28)
#define QSCRATCH_SS_PHY_CTRL 0x30
#define LANE0_PWR_PRESENT BIT(24)
#define QSCRATCH_GENERAL_CFG 0x08
#define PIPE_UTMI_CLK_SEL BIT(0)
#define PIPE3_PHYSTATUS_SW BIT(3)
#define PIPE_UTMI_CLK_DIS BIT(8)
#define PWR_EVNT_IRQ_STAT_REG 0x58
#define PWR_EVNT_LPM_IN_L2_MASK BIT(4)
#define PWR_EVNT_LPM_OUT_L2_MASK BIT(5)
struct dwc3_qcom {
struct device *dev;
void __iomem *qscratch_base;
struct platform_device *dwc3;
struct clk **clks;
int num_clocks;
struct reset_control *resets;
int hs_phy_irq;
int dp_hs_phy_irq;
int dm_hs_phy_irq;
int ss_phy_irq;
struct extcon_dev *edev;
struct extcon_dev *host_edev;
struct notifier_block vbus_nb;
struct notifier_block host_nb;
enum usb_dr_mode mode;
bool is_suspended;
bool pm_suspended;
};
static inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
{
u32 reg;
reg = readl(base + offset);
reg |= val;
writel(reg, base + offset);
/* ensure that above write is through */
readl(base + offset);
}
static inline void dwc3_qcom_clrbits(void __iomem *base, u32 offset, u32 val)
{
u32 reg;
reg = readl(base + offset);
reg &= ~val;
writel(reg, base + offset);
/* ensure that above write is through */
readl(base + offset);
}
static void dwc3_qcom_vbus_overrride_enable(struct dwc3_qcom *qcom, bool enable)
{
if (enable) {
dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_SS_PHY_CTRL,
LANE0_PWR_PRESENT);
dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_HS_PHY_CTRL,
UTMI_OTG_VBUS_VALID | SW_SESSVLD_SEL);
} else {
dwc3_qcom_clrbits(qcom->qscratch_base, QSCRATCH_SS_PHY_CTRL,
LANE0_PWR_PRESENT);
dwc3_qcom_clrbits(qcom->qscratch_base, QSCRATCH_HS_PHY_CTRL,
UTMI_OTG_VBUS_VALID | SW_SESSVLD_SEL);
}
}
static int dwc3_qcom_vbus_notifier(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct dwc3_qcom *qcom = container_of(nb, struct dwc3_qcom, vbus_nb);
/* enable vbus override for device mode */
dwc3_qcom_vbus_overrride_enable(qcom, event);
qcom->mode = event ? USB_DR_MODE_PERIPHERAL : USB_DR_MODE_HOST;
return NOTIFY_DONE;
}
static int dwc3_qcom_host_notifier(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct dwc3_qcom *qcom = container_of(nb, struct dwc3_qcom, host_nb);
/* disable vbus override in host mode */
dwc3_qcom_vbus_overrride_enable(qcom, !event);
qcom->mode = event ? USB_DR_MODE_HOST : USB_DR_MODE_PERIPHERAL;
return NOTIFY_DONE;
}
static int dwc3_qcom_register_extcon(struct dwc3_qcom *qcom)
{
struct device *dev = qcom->dev;
struct extcon_dev *host_edev;
int ret;
if (!of_property_read_bool(dev->of_node, "extcon"))
return 0;
qcom->edev = extcon_get_edev_by_phandle(dev, 0);
if (IS_ERR(qcom->edev))
return PTR_ERR(qcom->edev);
qcom->vbus_nb.notifier_call = dwc3_qcom_vbus_notifier;
qcom->host_edev = extcon_get_edev_by_phandle(dev, 1);
if (IS_ERR(qcom->host_edev))
qcom->host_edev = NULL;
ret = devm_extcon_register_notifier(dev, qcom->edev, EXTCON_USB,
&qcom->vbus_nb);
if (ret < 0) {
dev_err(dev, "VBUS notifier register failed\n");
return ret;
}
if (qcom->host_edev)
host_edev = qcom->host_edev;
else
host_edev = qcom->edev;
qcom->host_nb.notifier_call = dwc3_qcom_host_notifier;
ret = devm_extcon_register_notifier(dev, host_edev, EXTCON_USB_HOST,
&qcom->host_nb);
if (ret < 0) {
dev_err(dev, "Host notifier register failed\n");
return ret;
}
/* Update initial VBUS override based on extcon state */
if (extcon_get_state(qcom->edev, EXTCON_USB) ||
!extcon_get_state(host_edev, EXTCON_USB_HOST))
dwc3_qcom_vbus_notifier(&qcom->vbus_nb, true, qcom->edev);
else
dwc3_qcom_vbus_notifier(&qcom->vbus_nb, false, qcom->edev);
return 0;
}
static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
{
if (qcom->hs_phy_irq) {
disable_irq_wake(qcom->hs_phy_irq);
disable_irq_nosync(qcom->hs_phy_irq);
}
if (qcom->dp_hs_phy_irq) {
disable_irq_wake(qcom->dp_hs_phy_irq);
disable_irq_nosync(qcom->dp_hs_phy_irq);
}
if (qcom->dm_hs_phy_irq) {
disable_irq_wake(qcom->dm_hs_phy_irq);
disable_irq_nosync(qcom->dm_hs_phy_irq);
}
if (qcom->ss_phy_irq) {
disable_irq_wake(qcom->ss_phy_irq);
disable_irq_nosync(qcom->ss_phy_irq);
}
}
static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
{
if (qcom->hs_phy_irq) {
enable_irq(qcom->hs_phy_irq);
enable_irq_wake(qcom->hs_phy_irq);
}
if (qcom->dp_hs_phy_irq) {
enable_irq(qcom->dp_hs_phy_irq);
enable_irq_wake(qcom->dp_hs_phy_irq);
}
if (qcom->dm_hs_phy_irq) {
enable_irq(qcom->dm_hs_phy_irq);
enable_irq_wake(qcom->dm_hs_phy_irq);
}
if (qcom->ss_phy_irq) {
enable_irq(qcom->ss_phy_irq);
enable_irq_wake(qcom->ss_phy_irq);
}
}
static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
{
u32 val;
int i;
if (qcom->is_suspended)
return 0;
val = readl(qcom->qscratch_base + PWR_EVNT_IRQ_STAT_REG);
if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
dev_err(qcom->dev, "HS-PHY not in L2\n");
for (i = qcom->num_clocks - 1; i >= 0; i--)
clk_disable_unprepare(qcom->clks[i]);
qcom->is_suspended = true;
dwc3_qcom_enable_interrupts(qcom);
return 0;
}
static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
{
int ret;
int i;
if (!qcom->is_suspended)
return 0;
dwc3_qcom_disable_interrupts(qcom);
for (i = 0; i < qcom->num_clocks; i++) {
ret = clk_prepare_enable(qcom->clks[i]);
if (ret < 0) {
while (--i >= 0)
clk_disable_unprepare(qcom->clks[i]);
return ret;
}
}
/* Clear existing events from PHY related to L2 in/out */
dwc3_qcom_setbits(qcom->qscratch_base, PWR_EVNT_IRQ_STAT_REG,
PWR_EVNT_LPM_IN_L2_MASK | PWR_EVNT_LPM_OUT_L2_MASK);
qcom->is_suspended = false;
return 0;
}
static irqreturn_t qcom_dwc3_resume_irq(int irq, void *data)
{
struct dwc3_qcom *qcom = data;
struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
/* If pm_suspended then let pm_resume take care of resuming h/w */
if (qcom->pm_suspended)
return IRQ_HANDLED;
if (dwc->xhci)
pm_runtime_resume(&dwc->xhci->dev);
return IRQ_HANDLED;
}
static void dwc3_qcom_select_utmi_clk(struct dwc3_qcom *qcom)
{
/* Configure dwc3 to use UTMI clock as PIPE clock not present */
dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_GENERAL_CFG,
PIPE_UTMI_CLK_DIS);
usleep_range(100, 1000);
dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_GENERAL_CFG,
PIPE_UTMI_CLK_SEL | PIPE3_PHYSTATUS_SW);
usleep_range(100, 1000);
dwc3_qcom_clrbits(qcom->qscratch_base, QSCRATCH_GENERAL_CFG,
PIPE_UTMI_CLK_DIS);
}
static int dwc3_qcom_setup_irq(struct platform_device *pdev)
{
struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
int irq, ret;
irq = platform_get_irq_byname(pdev, "hs_phy_irq");
if (irq > 0) {
/* Keep wakeup interrupts disabled until suspend */
irq_set_status_flags(irq, IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
qcom_dwc3_resume_irq,
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
"qcom_dwc3 HS", qcom);
if (ret) {
dev_err(qcom->dev, "hs_phy_irq failed: %d\n", ret);
return ret;
}
qcom->hs_phy_irq = irq;
}
irq = platform_get_irq_byname(pdev, "dp_hs_phy_irq");
if (irq > 0) {
irq_set_status_flags(irq, IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
qcom_dwc3_resume_irq,
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
"qcom_dwc3 DP_HS", qcom);
if (ret) {
dev_err(qcom->dev, "dp_hs_phy_irq failed: %d\n", ret);
return ret;
}
qcom->dp_hs_phy_irq = irq;
}
irq = platform_get_irq_byname(pdev, "dm_hs_phy_irq");
if (irq > 0) {
irq_set_status_flags(irq, IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
qcom_dwc3_resume_irq,
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
"qcom_dwc3 DM_HS", qcom);
if (ret) {
dev_err(qcom->dev, "dm_hs_phy_irq failed: %d\n", ret);
return ret;
}
qcom->dm_hs_phy_irq = irq;
}
irq = platform_get_irq_byname(pdev, "ss_phy_irq");
if (irq > 0) {
irq_set_status_flags(irq, IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
qcom_dwc3_resume_irq,
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
"qcom_dwc3 SS", qcom);
if (ret) {
dev_err(qcom->dev, "ss_phy_irq failed: %d\n", ret);
return ret;
}
qcom->ss_phy_irq = irq;
}
return 0;
}
static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
{
struct device *dev = qcom->dev;
struct device_node *np = dev->of_node;
int i;
qcom->num_clocks = count;
if (!count)
return 0;
qcom->clks = devm_kcalloc(dev, qcom->num_clocks,
sizeof(struct clk *), GFP_KERNEL);
if (!qcom->clks)
return -ENOMEM;
for (i = 0; i < qcom->num_clocks; i++) {
struct clk *clk;
int ret;
clk = of_clk_get(np, i);
if (IS_ERR(clk)) {
while (--i >= 0)
clk_put(qcom->clks[i]);
return PTR_ERR(clk);
}
ret = clk_prepare_enable(clk);
if (ret < 0) {
while (--i >= 0) {
clk_disable_unprepare(qcom->clks[i]);
clk_put(qcom->clks[i]);
}
clk_put(clk);
return ret;
}
qcom->clks[i] = clk;
}
return 0;
}
static int dwc3_qcom_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node, *dwc3_np;
struct device *dev = &pdev->dev;
struct dwc3_qcom *qcom;
struct resource *res;
int ret, i;
bool ignore_pipe_clk;
qcom = devm_kzalloc(&pdev->dev, sizeof(*qcom), GFP_KERNEL);
if (!qcom)
return -ENOMEM;
platform_set_drvdata(pdev, qcom);
qcom->dev = &pdev->dev;
qcom->resets = devm_reset_control_array_get_optional_exclusive(dev);
if (IS_ERR(qcom->resets)) {
ret = PTR_ERR(qcom->resets);
dev_err(&pdev->dev, "failed to get resets, err=%d\n", ret);
return ret;
}
ret = reset_control_assert(qcom->resets);
if (ret) {
dev_err(&pdev->dev, "failed to assert resets, err=%d\n", ret);
return ret;
}
usleep_range(10, 1000);
ret = reset_control_deassert(qcom->resets);
if (ret) {
dev_err(&pdev->dev, "failed to deassert resets, err=%d\n", ret);
goto reset_assert;
}
ret = dwc3_qcom_clk_init(qcom, of_count_phandle_with_args(np,
"clocks", "#clock-cells"));
if (ret) {
dev_err(dev, "failed to get clocks\n");
goto reset_assert;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
qcom->qscratch_base = devm_ioremap_resource(dev, res);
if (IS_ERR(qcom->qscratch_base)) {
dev_err(dev, "failed to map qscratch, err=%d\n", ret);
ret = PTR_ERR(qcom->qscratch_base);
goto clk_disable;
}
ret = dwc3_qcom_setup_irq(pdev);
if (ret)
goto clk_disable;
dwc3_np = of_get_child_by_name(np, "dwc3");
if (!dwc3_np) {
dev_err(dev, "failed to find dwc3 core child\n");
ret = -ENODEV;
goto clk_disable;
}
/*
* Disable pipe_clk requirement if specified. Used when dwc3
* operates without SSPHY and only HS/FS/LS modes are supported.
*/
ignore_pipe_clk = device_property_read_bool(dev,
"qcom,select-utmi-as-pipe-clk");
if (ignore_pipe_clk)
dwc3_qcom_select_utmi_clk(qcom);
ret = of_platform_populate(np, NULL, NULL, dev);
if (ret) {
dev_err(dev, "failed to register dwc3 core - %d\n", ret);
goto clk_disable;
}
qcom->dwc3 = of_find_device_by_node(dwc3_np);
if (!qcom->dwc3) {
dev_err(&pdev->dev, "failed to get dwc3 platform device\n");
ret = -ENODEV;
goto depopulate;
}
qcom->mode = usb_get_dr_mode(&qcom->dwc3->dev);
/* enable vbus override for device mode */
if (qcom->mode == USB_DR_MODE_PERIPHERAL)
dwc3_qcom_vbus_overrride_enable(qcom, true);
/* register extcon to override sw_vbus on Vbus change later */
ret = dwc3_qcom_register_extcon(qcom);
if (ret)
goto depopulate;
device_init_wakeup(&pdev->dev, 1);
qcom->is_suspended = false;
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_forbid(dev);
return 0;
depopulate:
of_platform_depopulate(&pdev->dev);
clk_disable:
for (i = qcom->num_clocks - 1; i >= 0; i--) {
clk_disable_unprepare(qcom->clks[i]);
clk_put(qcom->clks[i]);
}
reset_assert:
reset_control_assert(qcom->resets);
return ret;
}
static int dwc3_qcom_remove(struct platform_device *pdev)
{
struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
struct device *dev = &pdev->dev;
int i;
of_platform_depopulate(dev);
for (i = qcom->num_clocks - 1; i >= 0; i--) {
clk_disable_unprepare(qcom->clks[i]);
clk_put(qcom->clks[i]);
}
qcom->num_clocks = 0;
reset_control_assert(qcom->resets);
pm_runtime_allow(dev);
pm_runtime_disable(dev);
return 0;
}
static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
{
struct dwc3_qcom *qcom = dev_get_drvdata(dev);
int ret = 0;
ret = dwc3_qcom_suspend(qcom);
if (!ret)
qcom->pm_suspended = true;
return ret;
}
static int __maybe_unused dwc3_qcom_pm_resume(struct device *dev)
{
struct dwc3_qcom *qcom = dev_get_drvdata(dev);
int ret;
ret = dwc3_qcom_resume(qcom);
if (!ret)
qcom->pm_suspended = false;
return ret;
}
static int __maybe_unused dwc3_qcom_runtime_suspend(struct device *dev)
{
struct dwc3_qcom *qcom = dev_get_drvdata(dev);
return dwc3_qcom_suspend(qcom);
}
static int __maybe_unused dwc3_qcom_runtime_resume(struct device *dev)
{
struct dwc3_qcom *qcom = dev_get_drvdata(dev);
return dwc3_qcom_resume(qcom);
}
static const struct dev_pm_ops dwc3_qcom_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_qcom_pm_suspend, dwc3_qcom_pm_resume)
SET_RUNTIME_PM_OPS(dwc3_qcom_runtime_suspend, dwc3_qcom_runtime_resume,
NULL)
};
static const struct of_device_id dwc3_qcom_of_match[] = {
{ .compatible = "qcom,dwc3" },
{ .compatible = "qcom,msm8996-dwc3" },
{ .compatible = "qcom,sdm845-dwc3" },
{ }
};
MODULE_DEVICE_TABLE(of, dwc3_qcom_of_match);
static struct platform_driver dwc3_qcom_driver = {
.probe = dwc3_qcom_probe,
.remove = dwc3_qcom_remove,
.driver = {
.name = "dwc3-qcom",
.pm = &dwc3_qcom_dev_pm_ops,
.of_match_table = dwc3_qcom_of_match,
},
};
module_platform_driver(dwc3_qcom_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare DWC3 QCOM Glue Driver");