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Date: Wed, 18 Feb 2015 11:05:24 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Zhangfei Gao <zhangfei.gao@...aro.org>, <balbi@...com>,
<mark.rutland@....com>, Peter Chen <peter.chen@...escale.com>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
"dan . zhao" <dan.zhao@...ilicon.com>,
Wangbinghui <wangbinghui@...ilicon.com>
CC: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] phy: add phy-hi6220-usb
Hi,
On Thursday 12 February 2015 01:07 PM, Zhangfei Gao wrote:
> Add usb phy controller for hi6220 platform
>
> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
> ---
> drivers/phy/Kconfig | 9 ++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-hi6220-usb.c | 306 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 316 insertions(+)
> create mode 100644 drivers/phy/phy-hi6220-usb.c
why is this driver in drivers/phy when it doesn't use the generic PHY framework
at all?
-Kishon
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index ccad880..40a1ef1 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -162,6 +162,15 @@ config PHY_HIX5HD2_SATA
> help
> Support for SATA PHY on Hisilicon hix5hd2 Soc.
>
> +config PHY_HI6220_USB
> + 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 PHY_SUN4I_USB
> tristate "Allwinner sunxi SoC USB PHY driver"
> depends on ARCH_SUNXI && HAS_IOMEM && OF
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index aa74f96..ec43c2d 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_TI_PIPE3) += phy-ti-pipe3.o
> obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o
> obj-$(CONFIG_PHY_EXYNOS5250_SATA) += phy-exynos5250-sata.o
> obj-$(CONFIG_PHY_HIX5HD2_SATA) += phy-hix5hd2-sata.o
> +obj-$(CONFIG_PHY_HI6220_USB) += phy-hi6220-usb.o
> obj-$(CONFIG_PHY_SUN4I_USB) += phy-sun4i-usb.o
> obj-$(CONFIG_PHY_SAMSUNG_USB2) += phy-exynos-usb2.o
> phy-exynos-usb2-y += phy-samsung-usb2.o
> diff --git a/drivers/phy/phy-hi6220-usb.c b/drivers/phy/phy-hi6220-usb.c
> new file mode 100644
> index 0000000..0d9f5ac
> --- /dev/null
> +++ b/drivers/phy/phy-hi6220-usb.c
> @@ -0,0 +1,306 @@
> +/*
> + * 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;
> + struct device *dev;
> + int gpio_vbus;
> + int gpio_id;
> + enum usb_otg_state state;
> +};
> +
> +static void hi6220_start_peripheral(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_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_vbus = gpio_get_value_cansleep(priv->gpio_vbus);
> +
> + if (gpio_vbus == 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_peripheral(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 int hi6220_phy_setup(struct hi6220_priv *priv, bool on)
> +{
> + struct regmap *reg = priv->reg;
> + u32 val, mask;
> + int ret;
> +
> + if (priv->reg == NULL)
> + return 0;
> +
> + 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)
> + goto out;
> +
> + 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)
> + goto out;
> +
> + 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)
> + goto out;
> +
> + ret = regmap_write(reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
> + if (ret)
> + goto out;
> + } else {
> + val = CTRL4_PICO_SIDDQ;
> + mask = val;
> + ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
> + if (ret)
> + goto out;
> +
> + 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)
> + goto out;
> + }
> +
> + return 0;
> +out:
> + dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
> + return ret;
> +}
> +
> +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;
> + struct device *dev = &pdev->dev;
> + int ret, irq;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
> + if (!otg)
> + return -ENOMEM;
> +
> + priv->dev = dev;
> + 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,vbus-gpios", 0);
> + if (priv->gpio_vbus == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + if (!gpio_is_valid(priv->gpio_vbus)) {
> + dev_err(dev, "invalid gpio %d\n", priv->gpio_vbus);
> + return -ENODEV;
> + }
> +
> + priv->gpio_id = of_get_named_gpio(np, "hisilicon,id-gpios", 0);
> + if (priv->gpio_id == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + if (!gpio_is_valid(priv->gpio_id)) {
> + dev_err(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;
> +
> + ret = devm_gpio_request_one(dev, priv->gpio_vbus,
> + GPIOF_IN, "gpio_vbus");
> + if (ret < 0) {
> + dev_err(dev, "gpio request failed for gpio_vbus\n");
> + return ret;
> + }
> +
> + ret = devm_gpio_request_one(dev, priv->gpio_id, GPIOF_IN, "gpio_id");
> + if (ret < 0) {
> + dev_err(dev, "gpio request failed for gpio_id\n");
> + return ret;
> + }
> +
> + priv->vcc = devm_regulator_get(dev, "vcc");
> + if (IS_ERR(priv->vcc)) {
> + if (PTR_ERR(priv->vcc) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + dev_info(dev, "No regulator found\n");
> + } else {
> + ret = regulator_enable(priv->vcc);
> + if (ret) {
> + dev_err(dev, "Failed to enable regulator\n");
> + return -ENODEV;
> + }
> + }
> +
> + priv->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(priv->clk)) {
> + regulator_disable(priv->vcc);
> + return PTR_ERR(priv->clk);
> + }
> + clk_prepare_enable(priv->clk);
> + INIT_DELAYED_WORK(&priv->work, hi6220_detect_work);
> +
> + irq = gpio_to_irq(priv->gpio_vbus);
> + ret = devm_request_irq(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(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(dev, "Can't register transceiver\n");
> + goto err_irq;
> + }
> + schedule_delayed_work(&priv->work, 0);
> +
> + return 0;
> +err_irq:
> + cancel_delayed_work_sync(&priv->work);
> + 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);
> +
> + cancel_delayed_work_sync(&priv->work);
> + 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");
>
--
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