Commit 35116993 authored by Ivan T. Ivanov's avatar Ivan T. Ivanov Committed by Felipe Balbi
Browse files

usb: phy: qcom: New APQ8016/MSM8916 USB transceiver driver 



Driver handles PHY initialization, clock management, power
management and workarounds required after resetting the hardware.

Signed-off-by: default avatarIvan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 75ddead2

Documentation/devicetree/bindings/usb/qcom,usb-8x16-phy.txt

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Qualcomm's APQ8016/MSM8916 USB transceiver controller



- compatible:

    Usage: required

    Value type: <string>

    Definition: Should contain "qcom,usb-8x16-phy".



- reg:

    Usage: required

    Value type: <prop-encoded-array>

    Definition: USB PHY base address and length of the register map



- clocks:

    Usage: required

    Value type: <prop-encoded-array>

    Definition: See clock-bindings.txt section "consumers". List of

                two clock specifiers for interface and core controller

                clocks.



- clock-names:

    Usage: required

    Value type: <string>

    Definition: Must contain "iface" and "core" strings.



- vddcx-supply:

    Usage: required

    Value type: <phandle>

    Definition: phandle to the regulator VDCCX supply node.



- v1p8-supply:

    Usage: required

    Value type: <phandle>

    Definition: phandle to the regulator 1.8V supply node.



- v3p3-supply:

    Usage: required

    Value type: <phandle>

    Definition: phandle to the regulator 3.3V supply node.



- resets:

    Usage: required

    Value type: <prop-encoded-array>

    Definition: See reset.txt section "consumers". PHY reset specifier.



- reset-names:

    Usage: required

    Value type: <string>

    Definition: Must contain "phy" string.



- switch-gpio:

    Usage: optional

    Value type: <prop-encoded-array>

    Definition: Some boards are using Dual SPDT USB Switch, witch is

                controlled by GPIO to de/multiplex D+/D- USB lines

                between connectors.



Example:

	usb_phy: phy@78d9000 {

		compatible = "qcom,usb-8x16-phy";

		reg = <0x78d9000 0x400>;



		vddcx-supply = <&pm8916_s1_corner>;

		v1p8-supply = <&pm8916_l7>;

		v3p3-supply = <&pm8916_l13>;



		clocks = <&gcc GCC_USB_HS_AHB_CLK>,

			     <&gcc GCC_USB_HS_SYSTEM_CLK>;

		clock-names = "iface", "core";



		resets = <&gcc GCC_USB2A_PHY_BCR>;

		reset-names = "phy";



		// D+/D- lines: 1 - Routed to HUB, 0 - Device connector

		switch-gpio = <&pm8916_gpios 4 GPIO_ACTIVE_HIGH>;

	};

drivers/usb/phy/Kconfig

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@@ -152,6 +152,20 @@ config USB_MSM_OTG 
	  This driver is not supported on boards like trout which

	  has an external PHY.



config USB_QCOM_8X16_PHY

	tristate "Qualcomm APQ8016/MSM8916 on-chip USB PHY controller support"

	depends on ARCH_QCOM || COMPILE_TEST

	depends on RESET_CONTROLLER

	select USB_PHY

	select USB_ULPI_VIEWPORT

	help

	  Enable this to support the USB transceiver on Qualcomm 8x16 chipsets.

	  It handles PHY initialization, clock management, power management,

	  and workarounds required after resetting the hardware.



	  To compile this driver as a module, choose M here: the

	  module will be called phy-qcom-8x16-usb.



config USB_MV_OTG

	tristate "Marvell USB OTG support"

	depends on USB_EHCI_MV && USB_MV_UDC && PM

drivers/usb/phy/Makefile

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@@ -20,6 +20,7 @@ obj-$(CONFIG_USB_EHCI_TEGRA) += phy-tegra-usb.o 
obj-$(CONFIG_USB_GPIO_VBUS)		+= phy-gpio-vbus-usb.o

obj-$(CONFIG_USB_ISP1301)		+= phy-isp1301.o

obj-$(CONFIG_USB_MSM_OTG)		+= phy-msm-usb.o

obj-$(CONFIG_USB_QCOM_8X16_PHY)	+= phy-qcom-8x16-usb.o

obj-$(CONFIG_USB_MV_OTG)		+= phy-mv-usb.o

obj-$(CONFIG_USB_MXS_PHY)		+= phy-mxs-usb.o

obj-$(CONFIG_USB_RCAR_PHY)		+= phy-rcar-usb.o

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		*v3p3;

	struct regulator		*v1p8;

	struct regulator		*vdd;



	struct reset_control		*phy_reset;



	struct extcon_specific_cable_nb vbus_cable;

	struct notifier_block		vbus_notify;



	struct gpio_desc		*switch_gpio;

	struct notifier_block		reboot_notify;

};



static int phy_8x16_regulators_enable(struct phy_8x16 *qphy)

{

	int ret;



	ret = regulator_set_voltage(qphy->vdd, HSPHY_VDD_MIN, HSPHY_VDD_MAX);

	if (ret)

		return ret;



	ret = regulator_enable(qphy->vdd);

	if (ret)

		return ret;



	ret = regulator_set_voltage(qphy->v3p3, HSPHY_3P3_MIN, HSPHY_3P3_MAX);

	if (ret)

		goto off_vdd;



	ret = regulator_enable(qphy->v3p3);

	if (ret)

		goto off_vdd;



	ret = regulator_set_voltage(qphy->v1p8, HSPHY_1P8_MIN, HSPHY_1P8_MAX);

	if (ret)

		goto off_3p3;



	ret = regulator_enable(qphy->v1p8);

	if (ret)

		goto off_3p3;



	return 0;



off_3p3:

	regulator_disable(qphy->v3p3);

off_vdd:

	regulator_disable(qphy->vdd);



	return ret;

}



static void phy_8x16_regulators_disable(struct phy_8x16 *qphy)

{

	regulator_disable(qphy->v1p8);

	regulator_disable(qphy->v3p3);

	regulator_disable(qphy->vdd);

}



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_cable_state(qphy->vbus_cable.edev, "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 regulator_bulk_data regs[3];

	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);



	regs[0].supply = "v3p3";

	regs[1].supply = "v1p8";

	regs[2].supply = "vddcx";



	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(regs), regs);

	if (ret)

		return ret;



	qphy->v3p3 = regs[0].consumer;

	qphy->v1p8 = regs[1].consumer;

	qphy->vdd  = regs[2].consumer;



	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);

	if (IS_ERR(qphy->switch_gpio))

		return PTR_ERR(qphy->switch_gpio);



	return 0;

}



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 extcon_dev *edev;

	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;



	edev = extcon_get_edev_by_phandle(phy->dev, 0);

	if (IS_ERR(edev))

		return PTR_ERR(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 = phy_8x16_regulators_enable(qphy);

	if (0 && ret)

		goto off_clks;



	qphy->vbus_notify.notifier_call = phy_8x16_vbus_notify;

	ret = extcon_register_interest(&qphy->vbus_cable, edev->name,

				       "USB", &qphy->vbus_notify);

	if (ret < 0)

		goto off_power;



	ret = usb_add_phy_dev(&qphy->phy);

	if (ret)

		goto off_extcon;



	qphy->reboot_notify.notifier_call = phy_8x16_reboot_notify;

	register_reboot_notifier(&qphy->reboot_notify);



	return 0;



off_extcon:

	extcon_unregister_interest(&qphy->vbus_cable);

off_power:

	phy_8x16_regulators_disable(qphy);

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);

	extcon_unregister_interest(&qphy->vbus_cable);



	/*

	 * 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);

	phy_8x16_regulators_disable(qphy);

	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");