Re: [PATCH v7 1/2] phy: Add new Exynos5 USB 3.0 PHY driver

Vivek Gautam
2014-04-30T03:24:25Z

Hi Kishon, Tomasz,

On Mon, Apr 28, 2014 at 11:47 AM, Vivek Gautam <gautam.vivek@samsung.com> wrote:
> Add a new driver for the USB 3.0 PHY on Exynos5 series of SoCs.
> The new driver uses the generic PHY framework and will interact
> with DWC3 controller present on Exynos5 series of SoCs.
> Thereby, removing old phy-samsung-usb3 driver and related code
> used untill now which was based on usb/phy framework.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
> ---

Does this patch looks Ok now ?
Actually we plan to get this in for 3.16, so if things are good we can
get a go ahead for this :-)

>
> Changes from v6:
> - Addressed review comments:
> -- Sorted config entries in Kconfig and Makefile
> -- Made #define to_usbdrd_phy(inst) to a static inline routine.
> -- Restructured exynos5_rate_to_clk() as suggested.
> -- Amended 'val' field for regmap_update_bits() in the routine
> exynos5_usbdrd_phy_isol().
> -- Removed sentinel entry from exynos5_usbdrd_phy_cfg[] struct.
> -- Removed check for 'match' entry in probe().
>
> .../devicetree/bindings/phy/samsung-phy.txt | 40 ++
> drivers/phy/Kconfig | 11 +
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-exynos5-usbdrd.c | 627 ++++++++++++++++++++
> 4 files changed, 679 insertions(+)
> create mode 100644 drivers/phy/phy-exynos5-usbdrd.c
>
> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> index b422e38..51efe4c 100644
> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> @@ -114,3 +114,43 @@ Example:
> compatible = "samsung,exynos-sataphy-i2c";
> reg = <0x38>;
> };
> +
> +Samsung Exynos5 SoC series USB DRD PHY controller
> +--------------------------------------------------
> +
> +Required properties:
> +- compatible : Should be set to one of the following supported values:
> + - "samsung,exynos5250-usbdrd-phy" - for exynos5250 SoC,
> + - "samsung,exynos5420-usbdrd-phy" - for exynos5420 SoC.
> +- reg : Register offset and length of USB DRD PHY register set;
> +- clocks: Clock IDs array as required by the controller
> +- clock-names: names of clocks correseponding to IDs in the clock property;
> + Required clocks:
> + - phy: main PHY clock (same as USB DRD controller i.e. DWC3 IP clock),
> + used for register access.
> + - ref: PHY's reference clock (usually crystal clock), used for
> + PHY operations, associated by phy name. It is used to
> + determine bit values for clock settings register.
> + For Exynos5420 this is given as 'sclk_usbphy30' in CMU.
> +- samsung,pmu-syscon: phandle for PMU system controller interface, used to
> + control pmu registers for power isolation.
> +- samsung,pmu-offset: phy power control register offset to pmu-system-controller
> + base.
> +- #phy-cells : from the generic PHY bindings, must be 1;
> +
> +For "samsung,exynos5250-usbdrd-phy" and "samsung,exynos5420-usbdrd-phy"
> +compatible PHYs, the second cell in the PHY specifier identifies the
> +PHY id, which is interpreted as follows:
> + 0 - UTMI+ type phy,
> + 1 - PIPE3 type phy,
> +
> +Example:
> + usb3_phy: usbphy@12100000 {
> + compatible = "samsung,exynos5250-usbdrd-phy";
> + reg = <0x12100000 0x100>;
> + clocks = <&clock 286>, <&clock 1>;
> + clock-names = "phy", "ref";
> + samsung,pmu-syscon = <&pmu_system_controller>;
> + samsung,pmu-offset = <0x704>;
> + #phy-cells = <1>;
> + };
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 3bb05f1..daa1707 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -159,6 +159,17 @@ config PHY_EXYNOS5250_USB2
> particular SoC is compiled in the driver. In case of Exynos 5250 four
> phys are available - device, host, HSIC0 and HSIC.
>
> +config PHY_EXYNOS5_USBDRD
> + tristate "Exynos5 SoC series USB DRD PHY driver"
> + depends on ARCH_EXYNOS5 && OF
> + depends on HAS_IOMEM
> + select GENERIC_PHY
> + select MFD_SYSCON
> + help
> + Enable USB DRD PHY support for Exynos 5 SoC series.
> + This driver provides PHY interface for USB 3.0 DRD controller
> + present on Exynos5 SoC series.
> +
> config PHY_XGENE
> tristate "APM X-Gene 15Gbps PHY support"
> depends on HAS_IOMEM && OF && (ARM64 || COMPILE_TEST)
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 2faf78e..333ba98 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -17,4 +17,5 @@ obj-$(CONFIG_PHY_SAMSUNG_USB2) += phy-samsung-usb2.o
> obj-$(CONFIG_PHY_EXYNOS4210_USB2) += phy-exynos4210-usb2.o
> obj-$(CONFIG_PHY_EXYNOS4X12_USB2) += phy-exynos4x12-usb2.o
> obj-$(CONFIG_PHY_EXYNOS5250_USB2) += phy-exynos5250-usb2.o
> +obj-$(CONFIG_PHY_EXYNOS5_USBDRD) += phy-exynos5-usbdrd.o
> obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
> diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
> new file mode 100644
> index 0000000..bc381e3
> --- /dev/null
> +++ b/drivers/phy/phy-exynos5-usbdrd.c
> @@ -0,0 +1,627 @@
> +/*
> + * Samsung EXYNOS5 SoC series USB DRD PHY driver
> + *
> + * Phy provider for USB 3.0 DRD controller on Exynos5 SoC series
> + *
> + * Copyright (C) 2014 Samsung Electronics Co., Ltd.
> + * Author: Vivek Gautam <gautam.vivek@samsung.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +
> +/* Exynos USB PHY registers */
> +#define EXYNOS5_FSEL_9MHZ6 0x0
> +#define EXYNOS5_FSEL_10MHZ 0x1
> +#define EXYNOS5_FSEL_12MHZ 0x2
> +#define EXYNOS5_FSEL_19MHZ2 0x3
> +#define EXYNOS5_FSEL_20MHZ 0x4
> +#define EXYNOS5_FSEL_24MHZ 0x5
> +#define EXYNOS5_FSEL_50MHZ 0x7
> +
> +/* EXYNOS5: USB 3.0 DRD PHY registers */
> +#define EXYNOS5_DRD_LINKSYSTEM 0x04
> +
> +#define LINKSYSTEM_FLADJ_MASK (0x3f << 1)
> +#define LINKSYSTEM_FLADJ(_x) ((_x) << 1)
> +#define LINKSYSTEM_XHCI_VERSION_CONTROL BIT(27)
> +
> +#define EXYNOS5_DRD_PHYUTMI 0x08
> +
> +#define PHYUTMI_OTGDISABLE BIT(6)
> +#define PHYUTMI_FORCESUSPEND BIT(1)
> +#define PHYUTMI_FORCESLEEP BIT(0)
> +
> +#define EXYNOS5_DRD_PHYPIPE 0x0c
> +
> +#define EXYNOS5_DRD_PHYCLKRST 0x10
> +
> +#define PHYCLKRST_EN_UTMISUSPEND BIT(31)
> +
> +#define PHYCLKRST_SSC_REFCLKSEL_MASK (0xff << 23)
> +#define PHYCLKRST_SSC_REFCLKSEL(_x) ((_x) << 23)
> +
> +#define PHYCLKRST_SSC_RANGE_MASK (0x03 << 21)
> +#define PHYCLKRST_SSC_RANGE(_x) ((_x) << 21)
> +
> +#define PHYCLKRST_SSC_EN BIT(20)
> +#define PHYCLKRST_REF_SSP_EN BIT(19)
> +#define PHYCLKRST_REF_CLKDIV2 BIT(18)
> +
> +#define PHYCLKRST_MPLL_MULTIPLIER_MASK (0x7f << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF (0x19 << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_50M_REF (0x32 << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF (0x68 << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF (0x7d << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF (0x02 << 11)
> +
> +#define PHYCLKRST_FSEL_UTMI_MASK (0x7 << 5)
> +#define PHYCLKRST_FSEL_PIPE_MASK (0x7 << 8)
> +#define PHYCLKRST_FSEL(_x) ((_x) << 5)
> +#define PHYCLKRST_FSEL_PAD_100MHZ (0x27 << 5)
> +#define PHYCLKRST_FSEL_PAD_24MHZ (0x2a << 5)
> +#define PHYCLKRST_FSEL_PAD_20MHZ (0x31 << 5)
> +#define PHYCLKRST_FSEL_PAD_19_2MHZ (0x38 << 5)
> +
> +#define PHYCLKRST_RETENABLEN BIT(4)
> +
> +#define PHYCLKRST_REFCLKSEL_MASK (0x03 << 2)
> +#define PHYCLKRST_REFCLKSEL_PAD_REFCLK (0x2 << 2)
> +#define PHYCLKRST_REFCLKSEL_EXT_REFCLK (0x3 << 2)
> +
> +#define PHYCLKRST_PORTRESET BIT(1)
> +#define PHYCLKRST_COMMONONN BIT(0)
> +
> +#define EXYNOS5_DRD_PHYREG0 0x14
> +#define EXYNOS5_DRD_PHYREG1 0x18
> +
> +#define EXYNOS5_DRD_PHYPARAM0 0x1c
> +
> +#define PHYPARAM0_REF_USE_PAD BIT(31)
> +#define PHYPARAM0_REF_LOSLEVEL_MASK (0x1f << 26)
> +#define PHYPARAM0_REF_LOSLEVEL (0x9 << 26)
> +
> +#define EXYNOS5_DRD_PHYPARAM1 0x20
> +
> +#define PHYPARAM1_PCS_TXDEEMPH_MASK (0x1f << 0)
> +#define PHYPARAM1_PCS_TXDEEMPH (0x1c)
> +
> +#define EXYNOS5_DRD_PHYTERM 0x24
> +
> +#define EXYNOS5_DRD_PHYTEST 0x28
> +
> +#define PHYTEST_POWERDOWN_SSP BIT(3)
> +#define PHYTEST_POWERDOWN_HSP BIT(2)
> +
> +#define EXYNOS5_DRD_PHYADP 0x2c
> +
> +#define EXYNOS5_DRD_PHYUTMICLKSEL 0x30
> +
> +#define PHYUTMICLKSEL_UTMI_CLKSEL BIT(2)
> +
> +#define EXYNOS5_DRD_PHYRESUME 0x34
> +#define EXYNOS5_DRD_LINKPORT 0x44
> +
> +/* Power isolation defined in power management unit */
> +#define EXYNOS5_USBDRD_PMU_ISOL BIT(0)
> +
> +#define KHZ 1000
> +#define MHZ (KHZ * KHZ)
> +
> +enum exynos5_usbdrd_phy_id {
> + EXYNOS5_DRDPHY_UTMI,
> + EXYNOS5_DRDPHY_PIPE3,
> + EXYNOS5_DRDPHYS_NUM,
> +};
> +
> +struct phy_usb_instance;
> +struct exynos5_usbdrd_phy;
> +
> +struct usbdrd_phy_config {
> + u32 id;
> + void (*phy_isol)(struct phy_usb_instance *inst, u32 on);
> + void (*phy_init)(struct exynos5_usbdrd_phy *phy_drd);
> + unsigned int (*set_refclk)(struct phy_usb_instance *inst);
> +};
> +
> +struct exynos5_usbdrd_phy_drvdata {
> + const struct usbdrd_phy_config *phy_cfg;
> +};
> +
> +/**
> + * struct exynos5_usbdrd_phy - driver data for USB 3.0 PHY
> + * @dev: pointer to device instance of this platform device
> + * @reg_phy: usb phy controller register memory base
> + * @clk: phy clock for register access
> + * @drv_data: pointer to SoC level driver data structure
> + * @phys[]: array for 'EXYNOS5_DRDPHYS_NUM' number of PHY
> + * instances each with its 'phy' and 'phy_cfg'.
> + * @extrefclk: frequency select settings when using 'separate
> + * reference clocks' for SS and HS operations
> + * @ref_clk: reference clock to PHY block from which PHY's
> + * operational clocks are derived
> + * @ref_rate: rate of above reference clock
> + */
> +struct exynos5_usbdrd_phy {
> + struct device *dev;
> + void __iomem *reg_phy;
> + struct clk *clk;
> + const struct exynos5_usbdrd_phy_drvdata *drv_data;
> + struct phy_usb_instance {
> + struct phy *phy;
> + u32 index;
> + struct regmap *reg_pmu;
> + u32 pmu_offset;
> + const struct usbdrd_phy_config *phy_cfg;
> + } phys[EXYNOS5_DRDPHYS_NUM];
> + u32 extrefclk;
> + struct clk *ref_clk;
> +};
> +
> +static inline
> +struct exynos5_usbdrd_phy *to_usbdrd_phy(struct phy_usb_instance *inst)
> +{
> + return container_of((inst), struct exynos5_usbdrd_phy,
> + phys[(inst)->index]);
> +}
> +
> +/*
> + * exynos5_rate_to_clk() converts the supplied clock rate to the value that
> + * can be written to the phy register.
> + */
> +static unsigned int exynos5_rate_to_clk(unsigned long rate, u32 *reg)
> +{
> + /* EXYNOS5_FSEL_MASK */
> +
> + switch (rate) {
> + case 9600 * KHZ:
> + *reg = EXYNOS5_FSEL_9MHZ6;
> + break;
> + case 10 * MHZ:
> + *reg = EXYNOS5_FSEL_10MHZ;
> + break;
> + case 12 * MHZ:
> + *reg = EXYNOS5_FSEL_12MHZ;
> + break;
> + case 19200 * KHZ:
> + *reg = EXYNOS5_FSEL_19MHZ2;
> + break;
> + case 20 * MHZ:
> + *reg = EXYNOS5_FSEL_20MHZ;
> + break;
> + case 24 * MHZ:
> + *reg = EXYNOS5_FSEL_24MHZ;
> + break;
> + case 50 * MHZ:
> + *reg = EXYNOS5_FSEL_50MHZ;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static void exynos5_usbdrd_phy_isol(struct phy_usb_instance *inst,
> + unsigned int on)
> +{
> + unsigned int val;
> +
> + if (!inst->reg_pmu)
> + return;
> +
> + val = on ? 0 : EXYNOS5_USBDRD_PMU_ISOL;
> +
> + regmap_update_bits(inst->reg_pmu, inst->pmu_offset,
> + EXYNOS5_USBDRD_PMU_ISOL, val);
> +}
> +
> +/*
> + * Sets the pipe3 phy's clk as EXTREFCLK (XXTI) which is internal clock
> + * from clock core. Further sets multiplier values and spread spectrum
> + * clock settings for SuperSpeed operations.
> + */
> +static unsigned int
> +exynos5_usbdrd_pipe3_set_refclk(struct phy_usb_instance *inst)
> +{
> + static u32 reg;
> + struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> + /* restore any previous reference clock settings */
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> + /* Use EXTREFCLK as ref clock */
> + reg &= ~PHYCLKRST_REFCLKSEL_MASK;
> + reg |= PHYCLKRST_REFCLKSEL_EXT_REFCLK;
> +
> + /* FSEL settings corresponding to reference clock */
> + reg &= ~PHYCLKRST_FSEL_PIPE_MASK |
> + PHYCLKRST_MPLL_MULTIPLIER_MASK |
> + PHYCLKRST_SSC_REFCLKSEL_MASK;
> + switch (phy_drd->extrefclk) {
> + case EXYNOS5_FSEL_50MHZ:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x00));
> + break;
> + case EXYNOS5_FSEL_24MHZ:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x88));
> + break;
> + case EXYNOS5_FSEL_20MHZ:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x00));
> + break;
> + case EXYNOS5_FSEL_19MHZ2:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x88));
> + break;
> + default:
> + dev_dbg(phy_drd->dev, "unsupported ref clk\n");
> + break;
> + }
> +
> + return reg;
> +}
> +
> +/*
> + * Sets the utmi phy's clk as EXTREFCLK (XXTI) which is internal clock
> + * from clock core. Further sets the FSEL values for HighSpeed operations.
> + */
> +static unsigned int
> +exynos5_usbdrd_utmi_set_refclk(struct phy_usb_instance *inst)
> +{
> + static u32 reg;
> + struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> + /* restore any previous reference clock settings */
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> + reg &= ~PHYCLKRST_REFCLKSEL_MASK;
> + reg |= PHYCLKRST_REFCLKSEL_EXT_REFCLK;
> +
> + reg &= ~PHYCLKRST_FSEL_UTMI_MASK |
> + PHYCLKRST_MPLL_MULTIPLIER_MASK |
> + PHYCLKRST_SSC_REFCLKSEL_MASK;
> + reg |= PHYCLKRST_FSEL(phy_drd->extrefclk);
> +
> + return reg;
> +}
> +
> +static void exynos5_usbdrd_pipe3_init(struct exynos5_usbdrd_phy *phy_drd)
> +{
> + u32 reg;
> +
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> + /* Set Tx De-Emphasis level */
> + reg &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
> + reg |= PHYPARAM1_PCS_TXDEEMPH;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> +
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> + reg &= ~PHYTEST_POWERDOWN_SSP;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +}
> +
> +static void exynos5_usbdrd_utmi_init(struct exynos5_usbdrd_phy *phy_drd)
> +{
> + u32 reg;
> +
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> + /* Set Loss-of-Signal Detector sensitivity */
> + reg &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
> + reg |= PHYPARAM0_REF_LOSLEVEL;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> +
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> + /* Set Tx De-Emphasis level */
> + reg &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
> + reg |= PHYPARAM1_PCS_TXDEEMPH;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> +
> + /* UTMI Power Control */
> + writel(PHYUTMI_OTGDISABLE, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);
> +
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> + reg &= ~PHYTEST_POWERDOWN_HSP;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +}
> +
> +static int exynos5_usbdrd_phy_init(struct phy *phy)
> +{
> + int ret;
> + u32 reg;
> + struct phy_usb_instance *inst = phy_get_drvdata(phy);
> + struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> + ret = clk_prepare_enable(phy_drd->clk);
> + if (ret)
> + return ret;
> +
> + /* Reset USB 3.0 PHY */
> + writel(0x0, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0);
> + writel(0x0, phy_drd->reg_phy + EXYNOS5_DRD_PHYRESUME);
> +
> + /*
> + * Setting the Frame length Adj value[6:1] to default 0x20
> + * See xHCI 1.0 spec, 5.2.4
> + */
> + reg = LINKSYSTEM_XHCI_VERSION_CONTROL |
> + LINKSYSTEM_FLADJ(0x20);
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_LINKSYSTEM);
> +
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> + /* Select PHY CLK source */
> + reg &= ~PHYPARAM0_REF_USE_PAD;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> +
> + /* This bit must be set for both HS and SS operations */
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMICLKSEL);
> + reg |= PHYUTMICLKSEL_UTMI_CLKSEL;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMICLKSEL);
> +
> + /* UTMI or PIPE3 specific init */
> + inst->phy_cfg->phy_init(phy_drd);
> +
> + /* reference clock settings */
> + reg = inst->phy_cfg->set_refclk(inst);
> +
> + /* Digital power supply in normal operating mode */
> + reg |= PHYCLKRST_RETENABLEN |
> + /* Enable ref clock for SS function */
> + PHYCLKRST_REF_SSP_EN |
> + /* Enable spread spectrum */
> + PHYCLKRST_SSC_EN |
> + /* Power down HS Bias and PLL blocks in suspend mode */
> + PHYCLKRST_COMMONONN |
> + /* Reset the port */
> + PHYCLKRST_PORTRESET;
> +
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> + udelay(10);
> +
> + reg &= ~PHYCLKRST_PORTRESET;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> + clk_disable_unprepare(phy_drd->clk);
> +
> + return 0;
> +}
> +
> +static int exynos5_usbdrd_phy_exit(struct phy *phy)
> +{
> + int ret;
> + u32 reg;
> + struct phy_usb_instance *inst = phy_get_drvdata(phy);
> + struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> + ret = clk_prepare_enable(phy_drd->clk);
> + if (ret)
> + return ret;
> +
> + reg = PHYUTMI_OTGDISABLE |
> + PHYUTMI_FORCESUSPEND |
> + PHYUTMI_FORCESLEEP;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);
> +
> + /* Resetting the PHYCLKRST enable bits to reduce leakage current */
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> + reg &= ~(PHYCLKRST_REF_SSP_EN |
> + PHYCLKRST_SSC_EN |
> + PHYCLKRST_COMMONONN);
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> + /* Control PHYTEST to remove leakage current */
> + reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> + reg |= PHYTEST_POWERDOWN_SSP |
> + PHYTEST_POWERDOWN_HSP;
> + writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +
> + clk_disable_unprepare(phy_drd->clk);
> +
> + return 0;
> +}
> +
> +static int exynos5_usbdrd_phy_power_on(struct phy *phy)
> +{
> + struct phy_usb_instance *inst = phy_get_drvdata(phy);
> + struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> + dev_dbg(phy_drd->dev, "Request to power_on usbdrd_phy phy\n");
> +
> + clk_prepare_enable(phy_drd->ref_clk);
> +
> + /* Power-on PHY*/
> + inst->phy_cfg->phy_isol(inst, 0);
> +
> + return 0;
> +}
> +
> +static int exynos5_usbdrd_phy_power_off(struct phy *phy)
> +{
> + struct phy_usb_instance *inst = phy_get_drvdata(phy);
> + struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> + dev_dbg(phy_drd->dev, "Request to power_off usbdrd_phy phy\n");
> +
> + /* Power-off the PHY */
> + inst->phy_cfg->phy_isol(inst, 1);
> +
> + clk_disable_unprepare(phy_drd->ref_clk);
> +
> + return 0;
> +}
> +
> +static struct phy *exynos5_usbdrd_phy_xlate(struct device *dev,
> + struct of_phandle_args *args)
> +{
> + struct exynos5_usbdrd_phy *phy_drd = dev_get_drvdata(dev);
> +
> + if (WARN_ON(args->args[0] > EXYNOS5_DRDPHYS_NUM))
> + return ERR_PTR(-ENODEV);
> +
> + return phy_drd->phys[args->args[0]].phy;
> +}
> +
> +static struct phy_ops exynos5_usbdrd_phy_ops = {
> + .init = exynos5_usbdrd_phy_init,
> + .exit = exynos5_usbdrd_phy_exit,
> + .power_on = exynos5_usbdrd_phy_power_on,
> + .power_off = exynos5_usbdrd_phy_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +const struct usbdrd_phy_config exynos5_usbdrd_phy_cfg[] = {
> + {
> + .id = EXYNOS5_DRDPHY_UTMI,
> + .phy_isol = exynos5_usbdrd_phy_isol,
> + .phy_init = exynos5_usbdrd_utmi_init,
> + .set_refclk = exynos5_usbdrd_utmi_set_refclk,
> + },
> + {
> + .id = EXYNOS5_DRDPHY_PIPE3,
> + .phy_isol = exynos5_usbdrd_phy_isol,
> + .phy_init = exynos5_usbdrd_pipe3_init,
> + .set_refclk = exynos5_usbdrd_pipe3_set_refclk,
> + },
> +};
> +
> +const struct exynos5_usbdrd_phy_drvdata exynos5420_usbdrd_phy = {
> + .phy_cfg = exynos5_usbdrd_phy_cfg,
> +};
> +
> +const struct exynos5_usbdrd_phy_drvdata exynos5250_usbdrd_phy = {
> + .phy_cfg = exynos5_usbdrd_phy_cfg,
> +};
> +
> +static const struct of_device_id exynos5_usbdrd_phy_of_match[] = {
> + {
> + .compatible = "samsung,exynos5250-usbdrd-phy",
> + .data = &exynos5250_usbdrd_phy
> + }, {
> + .compatible = "samsung,exynos5420-usbdrd-phy",
> + .data = &exynos5420_usbdrd_phy
> + },
> + { },
> +};
> +
> +static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + struct exynos5_usbdrd_phy *phy_drd;
> + struct phy_provider *phy_provider;
> + struct resource *res;
> + const struct of_device_id *match;
> + const struct exynos5_usbdrd_phy_drvdata *drv_data;
> + struct regmap *reg_pmu;
> + u32 pmu_offset;
> + unsigned long ref_rate;
> + int i, ret;
> +
> + phy_drd = devm_kzalloc(dev, sizeof(*phy_drd), GFP_KERNEL);
> + if (!phy_drd)
> + return -ENOMEM;
> +
> + dev_set_drvdata(dev, phy_drd);
> + phy_drd->dev = dev;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + phy_drd->reg_phy = devm_ioremap_resource(dev, res);
> + if (IS_ERR(phy_drd->reg_phy))
> + return PTR_ERR(phy_drd->reg_phy);
> +
> + match = of_match_node(exynos5_usbdrd_phy_of_match, pdev->dev.of_node);
> +
> + drv_data = match->data;
> + phy_drd->drv_data = drv_data;
> +
> + phy_drd->clk = devm_clk_get(dev, "phy");
> + if (IS_ERR(phy_drd->clk)) {
> + dev_err(dev, "Failed to get clock of phy controller\n");
> + return PTR_ERR(phy_drd->clk);
> + }
> +
> + phy_drd->ref_clk = devm_clk_get(dev, "ref");
> + if (IS_ERR(phy_drd->ref_clk)) {
> + dev_err(dev, "Failed to get reference clock of usbdrd phy\n");
> + return PTR_ERR(phy_drd->ref_clk);
> + }
> + ref_rate = clk_get_rate(phy_drd->ref_clk);
> +
> + ret = exynos5_rate_to_clk(ref_rate, &phy_drd->extrefclk);
> + if (ret) {
> + dev_err(phy_drd->dev, "Clock rate (%ld) not supported\n",
> + ref_rate);
> + return ret;
> + }
> +
> + reg_pmu = syscon_regmap_lookup_by_phandle(dev->of_node,
> + "samsung,pmu-syscon");
> + if (IS_ERR(reg_pmu)) {
> + dev_err(dev, "Failed to map PMU register (via syscon)\n");
> + return PTR_ERR(reg_pmu);
> + }
> +
> + ret = of_property_read_u32(node, "samsung,pmu-offset", &pmu_offset);
> + if (ret) {
> + dev_err(dev, "Missing pmu-offset for phy isolation\n");
> + return ret;
> + }
> +
> + dev_vdbg(dev, "Creating usbdrd_phy phy\n");
> +
> + for (i = 0; i < EXYNOS5_DRDPHYS_NUM; i++) {
> + struct phy *phy = devm_phy_create(dev, &exynos5_usbdrd_phy_ops,
> + NULL);
> + if (IS_ERR(phy)) {
> + dev_err(dev, "Failed to create usbdrd_phy phy\n");
> + return PTR_ERR(phy);
> + }
> +
> + phy_drd->phys[i].phy = phy;
> + phy_drd->phys[i].index = i;
> + phy_drd->phys[i].reg_pmu = reg_pmu;
> + phy_drd->phys[i].pmu_offset = pmu_offset;
> + phy_drd->phys[i].phy_cfg = &drv_data->phy_cfg[i];
> + phy_set_drvdata(phy, &phy_drd->phys[i]);
> + }
> +
> + phy_provider = devm_of_phy_provider_register(dev,
> + exynos5_usbdrd_phy_xlate);
> + if (IS_ERR(phy_provider)) {
> + dev_err(phy_drd->dev, "Failed to register phy provider\n");
> + return PTR_ERR(phy_provider);
> + }
> +
> + return 0;
> +}
> +
> +static struct platform_driver exynos5_usb3drd_phy = {
> + .probe = exynos5_usbdrd_phy_probe,
> + .driver = {
> + .of_match_table = exynos5_usbdrd_phy_of_match,
> + .name = "exynos5_usb3drd_phy",
> + .owner = THIS_MODULE,
> + }
> +};
> +
> +module_platform_driver(exynos5_usb3drd_phy);
> +MODULE_DESCRIPTION("Samsung EXYNOS5 SoCs USB 3.0 DRD controller PHY driver");
> +MODULE_AUTHOR("Vivek Gautam <gautam.vivek@samsung.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:exynos5_usb3drd_phy");
> --
> 1.7.10.4
>

--
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India