Re: [PATCH 1/4] usb: phy: add a new driver for usb3 phy

From: Marc Kleine-Budde
Date: Wed Sep 19 2012 - 10:41:56 EST

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In reply to: Kishon Vijay Abraham I: "[PATCH 1/4] usb: phy: add a new driver for usb3 phy"
Next in thread: ABRAHAM, KISHON VIJAY: "Re: [PATCH 1/4] usb: phy: add a new driver for usb3 phy"
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On 09/19/2012 01:30 PM, Kishon Vijay Abraham I wrote:
> Added a driver for usb3 phy that handles the interaction between usb phy
> device and dwc3 controller.
>
> This also includes device tree support for usb3 phy driver and
> the documentation with device tree binding information is updated.
>
> Currently writing to control module register is taken care in this
> driver which will be removed once the control module driver is in place.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> Signed-off-by: Felipe Balbi <balbi@xxxxxx>
> Signed-off-by: Moiz Sonasath <m-sonasath@xxxxxx>
> ---
> Documentation/devicetree/bindings/usb/usb-phy.txt | 18 +
> drivers/usb/phy/Kconfig | 9 +
> drivers/usb/phy/Makefile | 1 +
> drivers/usb/phy/omap-usb3.c | 369 +++++++++++++++++++++
> include/linux/usb/omap_usb.h | 72 ++++
> 5 files changed, 469 insertions(+)
> create mode 100644 drivers/usb/phy/omap-usb3.c
>
> diff --git a/Documentation/devicetree/bindings/usb/usb-phy.txt b/Documentation/devicetree/bindings/usb/usb-phy.txt
> index 80d4148..7c5fd89 100644
> --- a/Documentation/devicetree/bindings/usb/usb-phy.txt
> +++ b/Documentation/devicetree/bindings/usb/usb-phy.txt
> @@ -15,3 +15,21 @@ usb2phy@4a0ad080 {
> reg = <0x4a0ad080 0x58>,
> <0x4a002300 0x4>;
> };
> +
> +OMAP USB3 PHY
> +
> +Required properties:
> + - compatible: Should be "ti,omap-usb3"
> + - reg : Address and length of the register set for the device. Also
> +add the address of control module phy power register until a driver for
> +control module is added
> +
> +This is usually a subnode of ocp2scp to which it is connected.
> +
> +usb3phy@4a084400 {
> + compatible = "ti,omap-usb3";
> + reg = <0x0x4a084400 0x80>,
> + <0x4a084800 0x64>,
> + <0x4a084c00 0x40>,
> + <0x4a002370 0x4>;
> +};
> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> index 63c339b..353dc0c 100644
> --- a/drivers/usb/phy/Kconfig
> +++ b/drivers/usb/phy/Kconfig
> @@ -13,6 +13,15 @@ config OMAP_USB2
> The USB OTG controller communicates with the comparator using this
> driver.
>
> +config OMAP_USB3
> + tristate "OMAP USB3 PHY Driver"
> + select USB_OTG_UTILS
> + help
> + Enable this to support the USB3 PHY that is part of SOC. This
> + driver takes care of all the PHY functionality apart from comparator.
> + The USB OTG controller communicates with the comparator using this
> + driver.
> +
> config USB_ISP1301
> tristate "NXP ISP1301 USB transceiver support"
> depends on USB || USB_GADGET
> diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
> index b069f29..973b1e6 100644
> --- a/drivers/usb/phy/Makefile
> +++ b/drivers/usb/phy/Makefile
> @@ -5,6 +5,7 @@
> ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG
>
> obj-$(CONFIG_OMAP_USB2) += omap-usb2.o
> +obj-$(CONFIG_OMAP_USB3) += omap-usb3.o
> obj-$(CONFIG_USB_ISP1301) += isp1301.o
> obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o
> obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o
> diff --git a/drivers/usb/phy/omap-usb3.c b/drivers/usb/phy/omap-usb3.c
> new file mode 100644
> index 0000000..4dc84ca
> --- /dev/null
> +++ b/drivers/usb/phy/omap-usb3.c
> @@ -0,0 +1,369 @@
> +/*
> + * omap-usb3 - USB PHY, talking to dwc3 controller in OMAP.
> + *
> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
> + * 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.
> + *
> + * Author: Kishon Vijay Abraham I <kishon@xxxxxx>
> + *
> + * 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/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/usb/omap_usb.h>
> +#include <linux/of.h>
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/delay.h>
> +
> +static struct usb_dpll_params omap_usb3_dpll_params[NUM_SYS_CLKS] = {
> + {1250, 5, 4, 20, 0}, /* 12 MHz */
> + {3125, 20, 4, 20, 0}, /* 16.8 MHz */
> + {1172, 8, 4, 20, 65537}, /* 19.2 MHz */
> + {1250, 12, 4, 20, 0}, /* 26 MHz */
> + {3125, 47, 4, 20, 92843}, /* 38.4 MHz */
> +};
> +
> +/**
> + * omap5_usb_phy_power - power on/off the serializer using control module
> + * @phy: struct omap_usb *
> + * @on: 0 to off and 1 to on based on powering on or off the PHY
> + *
> + * omap_usb3 can call this API to power on or off the PHY.
> + */
> +static int omap5_usb_phy_power(struct omap_usb *phy, bool on)
> +{
> + u32 val;
> + unsigned long rate;
> + struct clk *sys_clk;
> +
> + sys_clk = clk_get(NULL, "sys_clkin");

Where's the corresponding clk_put()?

> + if (IS_ERR(sys_clk)) {
> + pr_err("%s: unable to get sys_clkin\n", __func__);
> + return -EINVAL;
> + }
> +
> + rate = clk_get_rate(sys_clk);
> + rate = rate/1000000;
> +
> + val = readl(phy->control_dev);
> +
> + if (on) {
> + val &= ~(USB_PWRCTL_CLK_CMD_MASK | USB_PWRCTL_CLK_FREQ_MASK);
> + val |= USB3_PHY_TX_RX_POWERON << USB_PWRCTL_CLK_CMD_SHIFT;
> + val |= rate << USB_PWRCTL_CLK_FREQ_SHIFT;
> + } else {
> + val &= ~USB_PWRCTL_CLK_CMD_MASK;
> + val |= USB3_PHY_TX_RX_POWEROFF << USB_PWRCTL_CLK_CMD_SHIFT;
> + }
> +
> + writel(val, phy->control_dev);
> +
> + return 0;
> +}
> +
> +static int omap_usb3_suspend(struct usb_phy *x, int suspend)
> +{
> + struct omap_usb *phy = phy_to_omapusb(x);
> + int val, ret;
> + int timeout = PLL_IDLE_TIME;
> +
> + if (suspend && !phy->is_suspended) {
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
> + val |= PLL_IDLE;
> + omap_usb_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
> +
> + do {
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_STATUS);
> + if (val & PLL_TICOPWDN)
> + break;
> + udelay(1);
> + } while (--timeout);
> +
> + omap5_usb_phy_power(phy, 0);
> + pm_runtime_put_sync(phy->dev);
> +
> + phy->is_suspended = 1;
> + } else if (!suspend && phy->is_suspended) {
> + phy->is_suspended = 0;
> + ret = pm_runtime_get_sync(phy->dev);
> + if (ret < 0) {
> + dev_err(phy->dev, "get_sync failed with err %d\n",
> + ret);
> + return ret;
> + }
> +
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
> + val &= ~PLL_IDLE;
> + omap_usb_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
> +
> + do {
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_STATUS);
> + if (!(val & PLL_TICOPWDN))
> + break;
> + udelay(1);
> + } while (--timeout);
> + }
> +
> + return 0;
> +}
> +
> +static inline enum sys_clk_rate __get_sys_clk_index(unsigned long rate)
> +{
> + switch (rate) {
> + case 12000000:
> + return CLK_RATE_12MHZ;
> + case 16800000:
> + return CLK_RATE_16MHZ;
> + case 19200000:
> + return CLK_RATE_19MHZ;
> + case 26000000:
> + return CLK_RATE_26MHZ;
> + case 38400000:
> + return CLK_RATE_38MHZ;
> + default:
> + return CLK_RATE_UNDEFINED;
> + }
> +}
> +
> +static void omap_usb_dpll_relock(struct omap_usb *phy)
> +{
> + u32 val;
> + unsigned long timeout;
> +
> + omap_usb_writel(phy->pll_ctrl_base, PLL_GO, SET_PLL_GO);
> +
> + timeout = jiffies + msecs_to_jiffies(20);
> + do {
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_STATUS);
> + if (val & PLL_LOCK)
> + break;
> + } while (!WARN_ON(time_after(jiffies, timeout)));
> +}
> +
> +static int omap_usb_dpll_lock(struct omap_usb *phy)
> +{
> + u32 val;
> + struct clk *sys_clk;
> + unsigned long rate;
> + enum sys_clk_rate clk_index;
> +
> + sys_clk = clk_get(NULL, "sys_clkin");

Where's the corresponding clk_put()?

> + if (IS_ERR(sys_clk)) {
> + pr_err("unable to get sys_clkin\n");
> + return PTR_ERR(sys_clk);
> + }
> +
> + rate = clk_get_rate(sys_clk);
> + clk_index = __get_sys_clk_index(rate);
> +
> + if (clk_index == CLK_RATE_UNDEFINED) {
> + pr_err("dpll cannot be locked for sys clk freq:%luHz\n", rate);
> + return -EINVAL;
> + }
> +
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
> + val &= ~PLL_REGN_MASK;
> + val |= omap_usb3_dpll_params[clk_index].n << PLL_REGN_SHIFT;
> + omap_usb_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
> +
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
> + val &= ~PLL_SELFREQDCO_MASK;
> + val |= omap_usb3_dpll_params[clk_index].freq << PLL_SELFREQDCO_SHIFT;
> + omap_usb_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
> +
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1);
> + val &= ~PLL_REGM_MASK;
> + val |= omap_usb3_dpll_params[clk_index].m << PLL_REGM_SHIFT;
> + omap_usb_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val);
> +
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_CONFIGURATION4);
> + val &= ~PLL_REGM_F_MASK;
> + val |= omap_usb3_dpll_params[clk_index].mf << PLL_REGM_F_SHIFT;
> + omap_usb_writel(phy->pll_ctrl_base, PLL_CONFIGURATION4, val);
> +
> + val = omap_usb_readl(phy->pll_ctrl_base, PLL_CONFIGURATION3);
> + val &= ~PLL_SD_MASK;
> + val |= omap_usb3_dpll_params[clk_index].sd << PLL_SD_SHIFT;
> + omap_usb_writel(phy->pll_ctrl_base, PLL_CONFIGURATION3, val);
> +
> + omap_usb_dpll_relock(phy);
> +
> + return 0;
> +}
> +
> +static int omap_usb3_init(struct usb_phy *x)
> +{
> + struct omap_usb *phy = phy_to_omapusb(x);
> +
> + omap_usb_dpll_lock(phy);
> + omap5_usb_phy_power(phy, 1);
> +
> + return 0;
> +}
> +
> +static int __devinit omap_usb3_probe(struct platform_device *pdev)
> +{
> + struct omap_usb *phy;
> + struct resource *res;
> +
> + phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy) {
> + dev_err(&pdev->dev, "unable to alloc mem for OMAP USB3 PHY\n");
> + return -ENOMEM;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> + if (!res) {
> + dev_err(&pdev->dev, "unable to get base address of pll_ctrl\n");
> + return -ENODEV;
> + }
> +
> + phy->pll_ctrl_base = devm_request_and_ioremap(&pdev->dev, res);
> + if (!phy->pll_ctrl_base) {
> + dev_err(&pdev->dev, "ioremap of pll_ctrl failed\n");
> + return -ENOMEM;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
> + if (!res) {
> + dev_err(&pdev->dev,
> + "unable to get address of control phy power\n");
> + return -ENODEV;
> + }
> +
> + phy->control_dev = devm_request_and_ioremap(&pdev->dev, res);
> + if (!phy->control_dev) {
> + dev_err(&pdev->dev, "ioremap of control_dev failed\n");
> + return -ENOMEM;
> + }
> +
> + phy->dev = &pdev->dev;
> +
> + phy->phy.dev = phy->dev;
> + phy->phy.label = "omap-usb3";
> + phy->phy.init = omap_usb3_init;
> + phy->phy.set_suspend = omap_usb3_suspend;
> +
> + phy->is_suspended = 1;
> + omap5_usb_phy_power(phy, 0);
> +
> + phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
> + if (IS_ERR(phy->wkupclk)) {
> + dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
> + return PTR_ERR(phy->wkupclk);
> + }
> + clk_prepare(phy->wkupclk);
> +
> + phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
> + if (IS_ERR(phy->optclk)) {
> + dev_err(&pdev->dev, "unable to get usb_otg_ss_refclk960m\n");
> + return PTR_ERR(phy->optclk);
> + }
> + clk_prepare(phy->optclk);

Are these clocks only needed on the PM usecase?

> +
> + usb_add_phy(&phy->phy, USB_PHY_TYPE_USB3);

Just to be sure and avoid race conditions, I would first set the drvdata.

> +
> + platform_set_drvdata(pdev, phy);
> +
> + pm_runtime_enable(phy->dev);
> +
> + return 0;
> +}
> +
> +static int __devexit omap_usb3_remove(struct platform_device *pdev)
> +{
> + struct omap_usb *phy = platform_get_drvdata(pdev);
> +
> + clk_unprepare(phy->wkupclk);
> + clk_unprepare(phy->optclk);
> + usb_remove_phy(&phy->phy);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_RUNTIME
> +
> +static int omap_usb3_runtime_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct omap_usb *phy = platform_get_drvdata(pdev);
> +
> + clk_disable(phy->wkupclk);
> + clk_disable(phy->optclk);
> +
> + return 0;
> +}
> +
> +static int omap_usb3_runtime_resume(struct device *dev)
> +{
> + u32 ret = 0;
> + struct platform_device *pdev = to_platform_device(dev);
> + struct omap_usb *phy = platform_get_drvdata(pdev);
> +
> + ret = clk_enable(phy->optclk);
> + if (ret) {
> + dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
> + goto err1;
> + }
> +
> + ret = clk_enable(phy->wkupclk);
> + if (ret) {
> + dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
> + goto err2;
> + }
> +
> + return 0;
> +
> +err2:
> + clk_disable(phy->optclk);
> +
> +err1:
> + return ret;
> +}
> +
> +static const struct dev_pm_ops omap_usb3_pm_ops = {
> + SET_RUNTIME_PM_OPS(omap_usb3_runtime_suspend, omap_usb3_runtime_resume,
> + NULL)
> +};
> +
> +#define DEV_PM_OPS (&omap_usb3_pm_ops)
> +#else
> +#define DEV_PM_OPS NULL
> +#endif
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id omap_usb3_id_table[] = {
> + { .compatible = "ti,omap-usb3" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, omap_usb3_id_table);
> +#endif
> +
> +static struct platform_driver omap_usb3_driver = {
> + .probe = omap_usb3_probe,
> + .remove = __devexit_p(omap_usb3_remove),
> + .driver = {
> + .name = "omap-usb3",
> + .owner = THIS_MODULE,
> + .pm = DEV_PM_OPS,
> + .of_match_table = of_match_ptr(omap_usb3_id_table),
> + },
> +};
> +
> +module_platform_driver(omap_usb3_driver);
> +
> +MODULE_ALIAS("platform: omap_usb3");
> +MODULE_AUTHOR("Texas Instruments Inc.");
> +MODULE_DESCRIPTION("OMAP USB3 phy driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/usb/omap_usb.h b/include/linux/usb/omap_usb.h
> index 0ea17f8..01ed008 100644
> --- a/include/linux/usb/omap_usb.h
> +++ b/include/linux/usb/omap_usb.h
> @@ -19,19 +19,80 @@
> #ifndef __DRIVERS_OMAP_USB2_H
> #define __DRIVERS_OMAP_USB2_H
>
> +#include <linux/io.h>
> #include <linux/usb/otg.h>

Are these structs, enums and defines needed outside of the omap-usb3.c
file? If not it's better to move these into this file.

>
> +struct usb_dpll_params {
> + u16 m;
> + u8 n;
> + u8 freq:3;
> + u8 sd;
> + u32 mf;
> +};
> +
> +enum sys_clk_rate {
> + CLK_RATE_UNDEFINED = -1,
> + CLK_RATE_12MHZ,
> + CLK_RATE_16MHZ,
> + CLK_RATE_19MHZ,
> + CLK_RATE_26MHZ,
> + CLK_RATE_38MHZ
> +};
> +
> +#define NUM_SYS_CLKS 5
> +#define PLL_STATUS 0x00000004
> +#define PLL_GO 0x00000008
> +#define PLL_CONFIGURATION1 0x0000000C
> +#define PLL_CONFIGURATION2 0x00000010
> +#define PLL_CONFIGURATION3 0x00000014
> +#define PLL_CONFIGURATION4 0x00000020
> +
> +#define PLL_REGM_MASK 0x001FFE00
> +#define PLL_REGM_SHIFT 0x9
> +#define PLL_REGM_F_MASK 0x0003FFFF
> +#define PLL_REGM_F_SHIFT 0x0
> +#define PLL_REGN_MASK 0x000001FE
> +#define PLL_REGN_SHIFT 0x1
> +#define PLL_SELFREQDCO_MASK 0x0000000E
> +#define PLL_SELFREQDCO_SHIFT 0x1
> +#define PLL_SD_MASK 0x0003FC00
> +#define PLL_SD_SHIFT 0x9
> +#define SET_PLL_GO 0x1
> +#define PLL_TICOPWDN 0x10000
> +#define PLL_LOCK 0x2
> +#define PLL_IDLE 0x1
> +
> +/*
> + * This is an Empirical value that works, need to confirm the actual
> + * value required for the USB3PHY_PLL_CONFIGURATION2.PLL_IDLE status
> + * to be correctly reflected in the USB3PHY_PLL_STATUS register.
> + */
> +# define PLL_IDLE_TIME 100;
> +
> struct omap_usb {
> struct usb_phy phy;
> struct phy_companion *comparator;
> + void __iomem *pll_ctrl_base;
> struct device *dev;
> u32 __iomem *control_dev;
> struct clk *wkupclk;
> + struct clk *optclk;
> u8 is_suspended:1;
> };
>
> #define PHY_PD 0x1
>
> +#define CONTROL_PHY_POWER_USB 0x00000370
> +
> +#define USB_PWRCTL_CLK_CMD_MASK 0x003FC000
> +#define USB_PWRCTL_CLK_CMD_SHIFT 0xE
> +
> +#define USB_PWRCTL_CLK_FREQ_MASK 0xFFC00000
> +#define USB_PWRCTL_CLK_FREQ_SHIFT 0x16
> +
> +#define USB3_PHY_TX_RX_POWERON 0x3
> +#define USB3_PHY_TX_RX_POWEROFF 0x0
> +
> #define phy_to_omapusb(x) container_of((x), struct omap_usb, phy)
>
> #if defined(CONFIG_OMAP_USB2) || defined(CONFIG_OMAP_USB2_MODULE)
> @@ -43,4 +104,15 @@ static inline int omap_usb2_set_comparator(struct phy_companion *comparator)
> }
> #endif
>
> +static inline u32 omap_usb_readl(const void __iomem *addr, unsigned offset)
> +{
> + return __raw_readl(addr + offset);
> +}
> +
> +static inline void omap_usb_writel(const void __iomem *addr, unsigned offset,
> + u32 data)
> +{
> + __raw_writel(data, addr + offset);
> +}
> +
> #endif /* __DRIVERS_OMAP_USB_H */
>
regards,
Marc

--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
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In reply to: Kishon Vijay Abraham I: "[PATCH 1/4] usb: phy: add a new driver for usb3 phy"
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