+++ /dev/null
-/*
- * 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 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 usb_phy *usb_phy = container_of(nb, struct usb_phy, vbus_nb);
- struct phy_8x16 *qphy = container_of(usb_phy, struct phy_8x16, phy);
-
- 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->phy.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);
- qphy->regs = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(qphy->regs))
- return PTR_ERR(qphy->regs);
-
- 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;
- phy->vbus_nb.notifier_call = phy_8x16_vbus_notify;
- phy->id_nb.notifier_call = NULL;
-
- ret = phy_8x16_read_devicetree(qphy);
- if (ret < 0)
- return ret;
-
- 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;
-
- 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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