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linux/drivers/usb/phy/phy-qcom-8x16-usb.c

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/*
* Copyright (c) 2015, Linaro Limited
*
* 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.
*
* 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.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/ulpi.h>
#define HSPHY_AHBBURST 0x0090
#define HSPHY_AHBMODE 0x0098
#define HSPHY_GENCONFIG 0x009c
#define HSPHY_GENCONFIG_2 0x00a0
#define HSPHY_USBCMD 0x0140
#define HSPHY_ULPI_VIEWPORT 0x0170
#define HSPHY_CTRL 0x0240
#define HSPHY_TXFIFO_IDLE_FORCE_DIS BIT(4)
#define HSPHY_SESS_VLD_CTRL_EN BIT(7)
#define HSPHY_POR_ASSERT BIT(0)
#define HSPHY_RETEN BIT(1)
#define HSPHY_SESS_VLD_CTRL BIT(25)
#define ULPI_PWR_CLK_MNG_REG 0x88
#define ULPI_PWR_OTG_COMP_DISABLE BIT(0)
#define ULPI_MISC_A 0x96
#define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1)
#define ULPI_MISC_A_VBUSVLDEXT BIT(0)
#define HSPHY_3P3_MIN 3050000 /* uV */
#define HSPHY_3P3_MAX 3300000 /* uV */
#define HSPHY_1P8_MIN 1800000 /* uV */
#define HSPHY_1P8_MAX 1800000 /* uV */
#define HSPHY_VDD_MIN 5
#define HSPHY_VDD_MAX 7
struct phy_8x16 {
struct usb_phy phy;
void __iomem *regs;
struct clk *core_clk;
struct clk *iface_clk;
struct regulator_bulk_data regulator[3];
struct reset_control *phy_reset;
struct extcon_dev *vbus_edev;
struct notifier_block vbus_notify;
struct gpio_desc *switch_gpio;
struct notifier_block reboot_notify;
};
static int phy_8x16_notify_connect(struct usb_phy *phy,
enum usb_device_speed speed)
{
struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy);
u32 val;
val = ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT;
usb_phy_io_write(&qphy->phy, val, ULPI_SET(ULPI_MISC_A));
val = readl(qphy->regs + HSPHY_USBCMD);
val |= HSPHY_SESS_VLD_CTRL;
writel(val, qphy->regs + HSPHY_USBCMD);
return 0;
}
static int phy_8x16_notify_disconnect(struct usb_phy *phy,
enum usb_device_speed speed)
{
struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy);
u32 val;
val = ULPI_MISC_A_VBUSVLDEXT | ULPI_MISC_A_VBUSVLDEXTSEL;
usb_phy_io_write(&qphy->phy, val, ULPI_CLR(ULPI_MISC_A));
val = readl(qphy->regs + HSPHY_USBCMD);
val &= ~HSPHY_SESS_VLD_CTRL;
writel(val, qphy->regs + HSPHY_USBCMD);
return 0;
}
static int phy_8x16_vbus_on(struct phy_8x16 *qphy)
{
phy_8x16_notify_connect(&qphy->phy, USB_SPEED_UNKNOWN);
/* Switch D+/D- lines to Device connector */
gpiod_set_value_cansleep(qphy->switch_gpio, 0);
return 0;
}
static int phy_8x16_vbus_off(struct phy_8x16 *qphy)
{
phy_8x16_notify_disconnect(&qphy->phy, USB_SPEED_UNKNOWN);
/* Switch D+/D- lines to USB HUB */
gpiod_set_value_cansleep(qphy->switch_gpio, 1);
return 0;
}
static int phy_8x16_vbus_notify(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct phy_8x16 *qphy = container_of(nb, struct phy_8x16, vbus_notify);
if (event)
phy_8x16_vbus_on(qphy);
else
phy_8x16_vbus_off(qphy);
return NOTIFY_DONE;
}
static int phy_8x16_init(struct usb_phy *phy)
{
struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy);
u32 val, init[] = {0x44, 0x6B, 0x24, 0x13};
u32 addr = ULPI_EXT_VENDOR_SPECIFIC;
int idx, state;
for (idx = 0; idx < ARRAY_SIZE(init); idx++)
usb_phy_io_write(phy, init[idx], addr + idx);
reset_control_reset(qphy->phy_reset);
/* Assert USB HSPHY_POR */
val = readl(qphy->regs + HSPHY_CTRL);
val |= HSPHY_POR_ASSERT;
writel(val, qphy->regs + HSPHY_CTRL);
/*
* wait for minimum 10 microseconds as suggested in HPG.
* Use a slightly larger value since the exact value didn't
* work 100% of the time.
*/
usleep_range(12, 15);
/* Deassert USB HSPHY_POR */
val = readl(qphy->regs + HSPHY_CTRL);
val &= ~HSPHY_POR_ASSERT;
writel(val, qphy->regs + HSPHY_CTRL);
usleep_range(10, 15);
writel(0x00, qphy->regs + HSPHY_AHBBURST);
writel(0x08, qphy->regs + HSPHY_AHBMODE);
/* workaround for rx buffer collision issue */
val = readl(qphy->regs + HSPHY_GENCONFIG);
val &= ~HSPHY_TXFIFO_IDLE_FORCE_DIS;
writel(val, qphy->regs + HSPHY_GENCONFIG);
val = readl(qphy->regs + HSPHY_GENCONFIG_2);
val |= HSPHY_SESS_VLD_CTRL_EN;
writel(val, qphy->regs + HSPHY_GENCONFIG_2);
val = ULPI_PWR_OTG_COMP_DISABLE;
usb_phy_io_write(phy, val, ULPI_SET(ULPI_PWR_CLK_MNG_REG));
state = extcon_get_state(qphy->vbus_edev, EXTCON_USB);
if (state)
phy_8x16_vbus_on(qphy);
else
phy_8x16_vbus_off(qphy);
val = usb_phy_io_read(&qphy->phy, ULPI_FUNC_CTRL);
val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
val |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
usb_phy_io_write(&qphy->phy, val, ULPI_FUNC_CTRL);
return 0;
}
static void phy_8x16_shutdown(struct usb_phy *phy)
{
u32 val;
/* Put the controller in non-driving mode */
val = usb_phy_io_read(phy, ULPI_FUNC_CTRL);
val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
usb_phy_io_write(phy, val, ULPI_FUNC_CTRL);
}
static int phy_8x16_read_devicetree(struct phy_8x16 *qphy)
{
struct device *dev = qphy->phy.dev;
int ret;
qphy->core_clk = devm_clk_get(dev, "core");
if (IS_ERR(qphy->core_clk))
return PTR_ERR(qphy->core_clk);
qphy->iface_clk = devm_clk_get(dev, "iface");
if (IS_ERR(qphy->iface_clk))
return PTR_ERR(qphy->iface_clk);
qphy->regulator[0].supply = "v3p3";
qphy->regulator[1].supply = "v1p8";
qphy->regulator[2].supply = "vddcx";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(qphy->regulator),
qphy->regulator);
if (ret)
return ret;
qphy->phy_reset = devm_reset_control_get(dev, "phy");
if (IS_ERR(qphy->phy_reset))
return PTR_ERR(qphy->phy_reset);
qphy->switch_gpio = devm_gpiod_get_optional(dev, "switch",
GPIOD_OUT_LOW);
return PTR_ERR_OR_ZERO(qphy->switch_gpio);
}
static int phy_8x16_reboot_notify(struct notifier_block *this,
unsigned long code, void *unused)
{
struct phy_8x16 *qphy;
qphy = container_of(this, struct phy_8x16, reboot_notify);
/*
* Ensure that D+/D- lines are routed to uB connector, so
* we could load bootloader/kernel at next reboot_notify
*/
gpiod_set_value_cansleep(qphy->switch_gpio, 0);
return NOTIFY_DONE;
}
static int phy_8x16_probe(struct platform_device *pdev)
{
struct phy_8x16 *qphy;
struct resource *res;
struct usb_phy *phy;
int ret;
qphy = devm_kzalloc(&pdev->dev, sizeof(*qphy), GFP_KERNEL);
if (!qphy)
return -ENOMEM;
platform_set_drvdata(pdev, qphy);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
qphy->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!qphy->regs)
return -ENOMEM;
phy = &qphy->phy;
phy->dev = &pdev->dev;
phy->label = dev_name(&pdev->dev);
phy->init = phy_8x16_init;
phy->shutdown = phy_8x16_shutdown;
phy->notify_connect = phy_8x16_notify_connect;
phy->notify_disconnect = phy_8x16_notify_disconnect;
phy->io_priv = qphy->regs + HSPHY_ULPI_VIEWPORT;
phy->io_ops = &ulpi_viewport_access_ops;
phy->type = USB_PHY_TYPE_USB2;
ret = phy_8x16_read_devicetree(qphy);
if (ret < 0)
return ret;
qphy->vbus_edev = extcon_get_edev_by_phandle(phy->dev, 0);
if (IS_ERR(qphy->vbus_edev))
return PTR_ERR(qphy->vbus_edev);
ret = clk_set_rate(qphy->core_clk, INT_MAX);
if (ret < 0)
dev_dbg(phy->dev, "Can't boost core clock\n");
ret = clk_prepare_enable(qphy->core_clk);
if (ret < 0)
return ret;
ret = clk_prepare_enable(qphy->iface_clk);
if (ret < 0)
goto off_core;
ret = regulator_bulk_enable(ARRAY_SIZE(qphy->regulator),
qphy->regulator);
if (WARN_ON(ret))
goto off_clks;
qphy->vbus_notify.notifier_call = phy_8x16_vbus_notify;
ret = devm_extcon_register_notifier(&pdev->dev, qphy->vbus_edev,
EXTCON_USB, &qphy->vbus_notify);
if (ret < 0)
goto off_power;
ret = usb_add_phy_dev(&qphy->phy);
if (ret)
goto off_power;
qphy->reboot_notify.notifier_call = phy_8x16_reboot_notify;
register_reboot_notifier(&qphy->reboot_notify);
return 0;
off_power:
regulator_bulk_disable(ARRAY_SIZE(qphy->regulator), qphy->regulator);
off_clks:
clk_disable_unprepare(qphy->iface_clk);
off_core:
clk_disable_unprepare(qphy->core_clk);
return ret;
}
static int phy_8x16_remove(struct platform_device *pdev)
{
struct phy_8x16 *qphy = platform_get_drvdata(pdev);
unregister_reboot_notifier(&qphy->reboot_notify);
/*
* Ensure that D+/D- lines are routed to uB connector, so
* we could load bootloader/kernel at next reboot_notify
*/
gpiod_set_value_cansleep(qphy->switch_gpio, 0);
usb_remove_phy(&qphy->phy);
clk_disable_unprepare(qphy->iface_clk);
clk_disable_unprepare(qphy->core_clk);
regulator_bulk_disable(ARRAY_SIZE(qphy->regulator), qphy->regulator);
return 0;
}
static const struct of_device_id phy_8x16_dt_match[] = {
{ .compatible = "qcom,usb-8x16-phy" },
{ }
};
MODULE_DEVICE_TABLE(of, phy_8x16_dt_match);
static struct platform_driver phy_8x16_driver = {
.probe = phy_8x16_probe,
.remove = phy_8x16_remove,
.driver = {
.name = "phy-qcom-8x16-usb",
.of_match_table = phy_8x16_dt_match,
},
};
module_platform_driver(phy_8x16_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm APQ8016/MSM8916 chipsets USB transceiver driver");
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