[PATCH v2 4/4] usb: phy: add phy-hi6220-usb
Peter Chen
peter.chen at freescale.com
Sun Feb 8 18:11:35 PST 2015
On Sat, Feb 07, 2015 at 12:56:06PM +0800, Zhangfei Gao wrote:
> Add usb phy controller for hi6220 platform
>
> Signed-off-by: Zhangfei Gao <zhangfei.gao at linaro.org>
> ---
> drivers/usb/phy/Kconfig | 9 ++
> drivers/usb/phy/Makefile | 1 +
> drivers/usb/phy/phy-hi6220-usb.c | 297 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 307 insertions(+)
> create mode 100644 drivers/usb/phy/phy-hi6220-usb.c
>
> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> index c6d0c8e..405a3d0 100644
> --- a/drivers/usb/phy/Kconfig
> +++ b/drivers/usb/phy/Kconfig
> @@ -173,6 +173,15 @@ config USB_MXS_PHY
>
> MXS Phy is used by some of the i.MX SoCs, for example imx23/28/6x.
>
> +config USB_HI6220_PHY
> + tristate "hi6220 USB PHY support"
> + select USB_PHY
> + select MFD_SYSCON
> + help
> + Enable this to support the HISILICON HI6220 USB PHY.
> +
> + To compile this driver as a module, choose M here.
> +
> config USB_RCAR_PHY
> tristate "Renesas R-Car USB PHY support"
> depends on USB || USB_GADGET
> diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
> index 75f2bba..00172d3 100644
> --- a/drivers/usb/phy/Makefile
> +++ b/drivers/usb/phy/Makefile
> @@ -18,6 +18,7 @@ obj-$(CONFIG_SAMSUNG_USBPHY) += phy-samsung-usb.o
> obj-$(CONFIG_TWL6030_USB) += phy-twl6030-usb.o
> obj-$(CONFIG_USB_EHCI_TEGRA) += phy-tegra-usb.o
> obj-$(CONFIG_USB_GPIO_VBUS) += phy-gpio-vbus-usb.o
> +obj-$(CONFIG_USB_HI6220_PHY) += phy-hi6220-usb.o
> obj-$(CONFIG_USB_ISP1301) += phy-isp1301.o
> obj-$(CONFIG_USB_MSM_OTG) += phy-msm-usb.o
> obj-$(CONFIG_USB_MV_OTG) += phy-mv-usb.o
> diff --git a/drivers/usb/phy/phy-hi6220-usb.c b/drivers/usb/phy/phy-hi6220-usb.c
> new file mode 100644
> index 0000000..8092bca
> --- /dev/null
> +++ b/drivers/usb/phy/phy-hi6220-usb.c
> @@ -0,0 +1,297 @@
> +/*
> + * Copyright (c) 2015 Linaro Ltd.
> + * Copyright (c) 2015 Hisilicon Limited.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/of_gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/usb/gadget.h>
> +#include <linux/usb/otg.h>
> +
> +#define SC_PERIPH_CTRL4 0x00c
> +
> +#define CTRL4_PICO_SIDDQ BIT(6)
> +#define CTRL4_PICO_OGDISABLE BIT(8)
> +#define CTRL4_PICO_VBUSVLDEXT BIT(10)
> +#define CTRL4_PICO_VBUSVLDEXTSEL BIT(11)
> +#define CTRL4_OTG_PHY_SEL BIT(21)
> +
> +#define SC_PERIPH_CTRL5 0x010
> +
> +#define CTRL5_USBOTG_RES_SEL BIT(3)
> +#define CTRL5_PICOPHY_ACAENB BIT(4)
> +#define CTRL5_PICOPHY_BC_MODE BIT(5)
> +#define CTRL5_PICOPHY_CHRGSEL BIT(6)
> +#define CTRL5_PICOPHY_VDATSRCEND BIT(7)
> +#define CTRL5_PICOPHY_VDATDETENB BIT(8)
> +#define CTRL5_PICOPHY_DCDENB BIT(9)
> +#define CTRL5_PICOPHY_IDDIG BIT(10)
> +
> +#define SC_PERIPH_CTRL8 0x018
> +#define SC_PERIPH_RSTEN0 0x300
> +#define SC_PERIPH_RSTDIS0 0x304
> +
> +#define RST0_USBOTG_BUS BIT(4)
> +#define RST0_POR_PICOPHY BIT(5)
> +#define RST0_USBOTG BIT(6)
> +#define RST0_USBOTG_32K BIT(7)
> +
> +#define EYE_PATTERN_PARA 0x7053348c
> +
> +struct hi6220_priv {
> + struct usb_phy phy;
> + struct delayed_work work;
> + struct regmap *reg;
> + struct clk *clk;
> + struct regulator *vcc;
> + int gpio_vbus;
> + int gpio_id;
> + enum usb_otg_state state;
> +};
> +
> +static void hi6220_start_periphrals(struct hi6220_priv *priv, bool on)
> +{
> + struct usb_otg *otg = priv->phy.otg;
> +
> + if (!otg->gadget)
> + return;
> +
> + if (on)
> + usb_gadget_connect(otg->gadget);
> + else
> + usb_gadget_disconnect(otg->gadget);
> +}
> +
> +static void hi6220_detect_work(struct work_struct *work)
> +{
> + struct hi6220_priv *priv =
> + container_of(work, struct hi6220_priv, work.work);
> + int gpio_id, gpio_vubs;
%s/gpio_vubs/gpio_vbus
> + enum usb_otg_state state;
> +
> + if (!gpio_is_valid(priv->gpio_id) || !gpio_is_valid(priv->gpio_vbus))
> + return;
> +
> + gpio_id = gpio_get_value_cansleep(priv->gpio_id);
> + gpio_vubs = gpio_get_value_cansleep(priv->gpio_vbus);
> +
> + if (gpio_vubs == 0) {
> + if (gpio_id == 1)
> + state = OTG_STATE_B_PERIPHERAL;
> + else
> + state = OTG_STATE_A_HOST;
> + } else {
> + state = OTG_STATE_A_HOST;
> + }
> +
> + if (priv->state != state) {
> + hi6220_start_periphrals(priv, state == OTG_STATE_B_PERIPHERAL);
> + priv->state = state;
> + }
> +}
> +
> +static irqreturn_t hiusb_gpio_intr(int irq, void *data)
> +{
> + struct hi6220_priv *priv = (struct hi6220_priv *)data;
> +
> + /* add debounce time */
> + schedule_delayed_work(&priv->work, msecs_to_jiffies(100));
> + return IRQ_HANDLED;
> +}
> +
> +static int hi6220_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
> +{
> + otg->gadget = gadget;
> + return 0;
> +}
> +
> +static void hi6220_phy_setup(struct hi6220_priv *priv, bool on)
> +{
> + struct regmap *reg = priv->reg;
> + u32 val, mask;
> + int ret;
> +
> + if (priv->reg == NULL)
> + return;
> +
> + if (on) {
> + val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
> + RST0_USBOTG | RST0_USBOTG_32K;
> + mask = val;
> + ret = regmap_update_bits(reg, SC_PERIPH_RSTDIS0, mask, val);
> + if (ret)
> + return;
> +
> + ret = regmap_read(reg, SC_PERIPH_CTRL5, &val);
> + val = CTRL5_USBOTG_RES_SEL | CTRL5_PICOPHY_ACAENB;
> + mask = val | CTRL5_PICOPHY_BC_MODE;
> + ret = regmap_update_bits(reg, SC_PERIPH_CTRL5, mask, val);
> + if (ret)
> + return;
> +
> + val = CTRL4_PICO_VBUSVLDEXT | CTRL4_PICO_VBUSVLDEXTSEL |
> + CTRL4_OTG_PHY_SEL;
> + mask = val | CTRL4_PICO_SIDDQ | CTRL4_PICO_OGDISABLE;
> + ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
> + if (ret)
> + return;
> +
> + ret = regmap_write(reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
> + if (ret)
> + return;
> + } else {
> + val = CTRL4_PICO_SIDDQ;
> + mask = val;
> + ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
> + if (ret)
> + return;
> +
> + ret = regmap_read(reg, SC_PERIPH_CTRL4, &val);
> +
> + val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
> + RST0_USBOTG | RST0_USBOTG_32K;
> + mask = val;
> + ret = regmap_update_bits(reg, SC_PERIPH_RSTEN0, mask, val);
> + if (ret)
> + return;
> + }
You have return value check for regmap API, but no error message or
return value for hi6220_phy_setup, it looks strange.
> +}
> +
> +static int hi6220_phy_probe(struct platform_device *pdev)
> +{
> + struct hi6220_priv *priv;
> + struct usb_otg *otg;
> + struct device_node *np = pdev->dev.of_node;
> + int ret, irq;
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
> + if (!otg)
> + return -ENOMEM;
> +
> + priv->phy.dev = &pdev->dev;
> + priv->phy.otg = otg;
> + priv->phy.label = "hi6220";
> + priv->phy.type = USB_PHY_TYPE_USB2;
> + otg->set_peripheral = hi6220_set_peripheral;
> + platform_set_drvdata(pdev, priv);
> +
> + priv->gpio_vbus = of_get_named_gpio(np, "hisilicon,gpio-vbus", 0);
> + if (priv->gpio_vbus == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + if (!gpio_is_valid(priv->gpio_vbus)) {
> + dev_err(&pdev->dev, "invalid gpio %d\n", priv->gpio_vbus);
> + return -ENODEV;
> + }
> +
> + priv->gpio_id = of_get_named_gpio(np, "hisilicon,gpio-id", 0);
> + if (priv->gpio_id == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + if (!gpio_is_valid(priv->gpio_id)) {
> + dev_err(&pdev->dev, "invalid gpio %d\n", priv->gpio_id);
> + return -ENODEV;
> + }
> +
> + priv->reg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
> + "hisilicon,peripheral-syscon");
> + if (IS_ERR(priv->reg))
> + priv->reg = NULL;
> +
see my comments at your v1.
> + INIT_DELAYED_WORK(&priv->work, hi6220_detect_work);
> +
> + ret = devm_gpio_request_one(&pdev->dev, priv->gpio_vbus,
> + GPIOF_IN, "gpio_vbus");
> + if (ret < 0) {
> + dev_err(&pdev->dev, "gpio request failed for gpio_vbus\n");
> + return ret;
> + }
> +
> + ret = devm_gpio_request_one(&pdev->dev, priv->gpio_id,
> + GPIOF_IN, "gpio_id");
> + if (ret < 0) {
> + dev_err(&pdev->dev, "gpio request failed for gpio_id\n");
> + return ret;
> + }
> +
> + priv->vcc = devm_regulator_get(&pdev->dev, "vcc");
> + if (!IS_ERR(priv->vcc)) {
EPROBE_DEFER?
> + ret = regulator_enable(priv->vcc);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to enable regulator\n");
> + return -ENODEV;
> + }
> + }
> +
> + priv->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(priv->clk)) {
> + regulator_disable(priv->vcc);
> + return PTR_ERR(priv->clk);
> + }
> + clk_prepare_enable(priv->clk);
> +
> + irq = gpio_to_irq(priv->gpio_vbus);
> + ret = devm_request_irq(&pdev->dev, gpio_to_irq(priv->gpio_vbus),
> + hiusb_gpio_intr, IRQF_NO_SUSPEND |
> + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
> + "vbus_gpio_intr", priv);
> + if (ret) {
> + dev_err(&pdev->dev, "request gpio irq failed.\n");
> + goto err_irq;
> + }
> +
> + hi6220_phy_setup(priv, true);
> + ret = usb_add_phy_dev(&priv->phy);
> + if (ret) {
> + dev_err(&pdev->dev, "Can't register transceiver\n");
> + goto err_irq;
> + }
> + schedule_delayed_work(&priv->work, 0);
> +
> + return 0;
> +err_irq:
> + clk_disable_unprepare(priv->clk);
> + regulator_disable(priv->vcc);
> + return ret;
> +}
> +
> +static int hi6220_phy_remove(struct platform_device *pdev)
> +{
> + struct hi6220_priv *priv = platform_get_drvdata(pdev);
> +
> + hi6220_phy_setup(priv, false);
> + clk_disable_unprepare(priv->clk);
> + regulator_disable(priv->vcc);
> + return 0;
> +}
> +
> +static const struct of_device_id hi6220_phy_of_match[] = {
> + {.compatible = "hisilicon,hi6220-usb-phy",},
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);
> +
> +static struct platform_driver hi6220_phy_driver = {
> + .probe = hi6220_phy_probe,
> + .remove = hi6220_phy_remove,
> + .driver = {
> + .name = "hi6220-usb-phy",
> + .of_match_table = hi6220_phy_of_match,
> + }
> +};
> +module_platform_driver(hi6220_phy_driver);
> +
> +MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
> +MODULE_ALIAS("platform:hi6220-usb-phy");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
--
Best Regards,
Peter Chen
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