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Date: Mon, 4 Nov 2013 18:42:08 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Kamil Debski <k.debski@...sung.com>
CC: "'Vivek Gautam'" <gautam.vivek@...sung.com>,
<linux-usb@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-doc@...r.kernel.org>, <gregkh@...uxfoundation.org>,
<kgene.kim@...sung.com>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Tomasz Figa <t.figa@...sung.com>, <balbi@...com>,
<jwerner@...omium.org>, <jg1.han@...sung.com>
Subject: Re: [PATCH RFC 1/4] phy: Add new Exynos5 USB 3.0 PHY driver
Hi,
On Monday 04 November 2013 03:45 PM, Kamil Debski wrote:
> Hi Kishon,
>
>> From: Kishon Vijay Abraham I [mailto:kishon@...com]
>> Sent: Monday, November 04, 2013 7:55 AM
>>
>> Hi Vivek,
>>
>> On Thursday 31 October 2013 01:15 PM, Vivek Gautam 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.
>>
>> In Exynos, you have a single IP that supports both USB3 and USB2 PHY
>> right? I think that needs to be mentioned here.
>
> As far as I know the IP is different.
Ok. Sometime back Vivek was mentioning about a single IP for both USB3
and USB2. Thought it should be this driver. Anyway thanks for the
clarification.
Cheers
Kishon
>
>> Do you have separate registers that should be used for
>> initializing/powerin_on/powering_off etc.. for usb2 phy and usb3 phy?
>> If so, then you should model this driver as a single driver that
>> supports two PHYs similar to what Sylwester has done before?
>
> Best wishes,
> Kamil
>
>> Cheers
>> Kishon
>>
>>>
>>> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
>>> ---
>>> .../devicetree/bindings/phy/samsung-phy.txt | 20 +
>>> drivers/phy/Kconfig | 7 +
>>> drivers/phy/Makefile | 1 +
>>> drivers/phy/phy-exynos5-usb3.c | 562
>> ++++++++++++++++++++
>>> 4 files changed, 590 insertions(+), 0 deletions(-)
>>> create mode 100644 drivers/phy/phy-exynos5-usb3.c
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> index c0fccaa..9b5c111 100644
>>> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> @@ -20,3 +20,23 @@ Required properties:
>>> - compatible : should be "samsung,exynos5250-dp-video-phy";
>>> - reg : offset and length of the Display Port PHY register set;
>>> - #phy-cells : from the generic PHY bindings, must be 0;
>>> +
>>> +Samsung Exynos5 SoC seiries USB 3.0 PHY controller
>>> +--------------------------------------------------
>>> +
>>> +Required properties:
>>> +- compatible :
>>> + should be "samsung,exynos5250-usb3phy" for exynos5250 SoC
>>> + should be "samsung,exynos5420-usb3phy" for exynos5420 SoC
>>> +- reg : Register offset and length array
>>> + - first field corresponds to USB 3.0 PHY register set;
>>> + - second field corresponds to PHY power isolation register
>>> + present in PMU;
>>> +- clocks: Clock IDs array as required by the controller
>>> +- clock-names: names of clocks correseponding to IDs in the clock
>> property;
>>> + Required clocks:
>>> + - first clock is main PHY clock (same as USB 3.0 controller IP
>> clock)
>>> + - second clock is reference clock (usually crystal clock)
>>> + optional clock:
>>> + - third clock is special clock used by PHY for operation
>>> +- #phy-cells : from the generic PHY bindings, must be 0;
>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index
>>> a344f3d..9a100c6 100644
>>> --- a/drivers/phy/Kconfig
>>> +++ b/drivers/phy/Kconfig
>>> @@ -51,4 +51,11 @@ config PHY_EXYNOS_DP_VIDEO
>>> help
>>> Support for Display Port PHY found on Samsung EXYNOS SoCs.
>>>
>>> +config PHY_EXYNOS5_USB3
>>> + tristate "Exynos5 SoC series USB 3.0 PHY driver"
>>> + depends on ARCH_EXYNOS5
>>> + select GENERIC_PHY
>>> + help
>>> + Enable USB 3.0 PHY support for Exynos 5 SoC series
>>> +
>>> endmenu
>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index
>>> d0caae9..9c06a61 100644
>>> --- a/drivers/phy/Makefile
>>> +++ b/drivers/phy/Makefile
>>> @@ -7,3 +7,4 @@ obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-
>> video.o
>>> obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
>>> obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
>>> obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o
>>> +obj-$(CONFIG_PHY_EXYNOS5_USB3) += phy-exynos5-usb3.o
>>> diff --git a/drivers/phy/phy-exynos5-usb3.c
>>> b/drivers/phy/phy-exynos5-usb3.c new file mode 100644 index
>>> 0000000..b9a2674
>>> --- /dev/null
>>> +++ b/drivers/phy/phy-exynos5-usb3.c
>>> @@ -0,0 +1,562 @@
>>> +/*
>>> + * Samsung EXYNOS5 SoC series USB 3.0 PHY driver
>>> + *
>>> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
>>> + * Author: Vivek Gautam <gautam.vivek@...sung.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>
>>> +
>>> +/* 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 (0x1 << 27)
>>> +
>>> +#define EXYNOS5_DRD_PHYUTMI (0x08)
>>> +
>>> +#define PHYUTMI_OTGDISABLE (0x1 << 6)
>>> +#define PHYUTMI_FORCESUSPEND (0x1 << 1)
>>> +#define PHYUTMI_FORCESLEEP (0x1 << 0)
>>> +
>>> +#define EXYNOS5_DRD_PHYPIPE (0x0c)
>>> +
>>> +#define EXYNOS5_DRD_PHYCLKRST (0x10)
>>> +
>>> +#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 (0x1 << 20)
>>> +#define PHYCLKRST_REF_SSP_EN (0x1 << 19)
>>> +#define PHYCLKRST_REF_CLKDIV2 (0x1 << 18)
>>> +
>>> +#define PHYCLKRST_MPLL_MULTIPLIER_MASK (0x7f << 11)
>>> +#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF (0x19 << 11)
>>> +#define PHYCLKRST_MPLL_MULTIPLIER_50M_REF (0x02 << 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_MASK (0x3f << 5)
>>> +#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 (0x1 << 4)
>>> +
>>> +#define PHYCLKRST_REFCLKSEL_MASK (0x03 << 2)
>>> +#define PHYCLKRST_REFCLKSEL_PAD_REFCLK (0x2 << 2)
>>> +#define PHYCLKRST_REFCLKSEL_EXT_REFCLK (0x3 << 2)
>>> +
>>> +#define PHYCLKRST_PORTRESET (0x1 << 1)
>>> +#define PHYCLKRST_COMMONONN (0x1 << 0)
>>> +
>>> +#define EXYNOS5_DRD_PHYREG0 (0x14)
>>> +#define EXYNOS5_DRD_PHYREG1 (0x18)
>>> +
>>> +#define EXYNOS5_DRD_PHYPARAM0 (0x1c)
>>> +
>>> +#define PHYPARAM0_REF_USE_PAD (0x1 << 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 (0x1 << 3)
>>> +#define PHYTEST_POWERDOWN_HSP (0x1 << 2)
>>> +
>>> +#define EXYNOS5_DRD_PHYADP (0x2c)
>>> +
>>> +#define EXYNOS5_DRD_PHYBATCHG (0x30)
>>> +
>>> +#define PHYBATCHG_UTMI_CLKSEL (0x1 << 2)
>>> +
>>> +#define EXYNOS5_DRD_PHYRESUME (0x34)
>>> +#define EXYNOS5_DRD_LINKPORT (0x44)
>>> +
>>> +
>>> +/* Isolation, configured in the power management unit */
>>> +#define EXYNOS5_USB_ISOL_DRD (1 << 0)
>>> +
>>> +#define CLKSEL_ERROR -1
>>> +
>>> +#ifndef KHZ
>>> +#define KHZ 1000
>>> +#endif
>>> +
>>> +#ifndef MHZ
>>> +#define MHZ (KHZ * KHZ)
>>> +#endif
>>> +
>>> +enum samsung_cpu_type {
>>> + TYPE_EXYNOS5250,
>>> + TYPE_EXYNOS5420,
>>> +};
>>> +
>>> +enum usb3phy_state {
>>> + STATE_OFF,
>>> + STATE_ON,
>>> +};
>>> +
>>> +struct usb3phy_config {
>>> + enum samsung_cpu_type cpu;
>>> + bool has_sclk_usbphy30;
>>> +};
>>> +
>>> +struct usb3phy_instance {
>>> + char *label;
>>> + struct usb3phy_driver *drv;
>>> + struct phy *phy;
>>> + enum usb3phy_state state;
>>> + u32 clk;
>>> + unsigned long rate;
>>> +};
>>> +
>>> +struct usb3phy_driver {
>>> + struct device *dev;
>>> + void __iomem *reg_phy;
>>> + void __iomem *reg_isol;
>>> + struct clk *clk;
>>> + struct clk *sclk_usbphy30;
>>> + struct usb3phy_instance instance;
>>> +};
>>> +
>>> +/*
>>> + * exynos5_rate_to_clk() converts the supplied clock rate to the
>>> +value that
>>> + * can be written to the phy register.
>>> + */
>>> +static u32 exynos5_rate_to_clk(unsigned long rate) {
>>> + unsigned int clksel;
>>> +
>>> + /* EXYNOS5_FSEL_MASK */
>>> +
>>> + switch (rate) {
>>> + case 9600 * KHZ:
>>> + clksel = EXYNOS5_FSEL_9MHZ6;
>>> + break;
>>> + case 10 * MHZ:
>>> + clksel = EXYNOS5_FSEL_10MHZ;
>>> + break;
>>> + case 12 * MHZ:
>>> + clksel = EXYNOS5_FSEL_12MHZ;
>>> + break;
>>> + case 19200 * KHZ:
>>> + clksel = EXYNOS5_FSEL_19MHZ2;
>>> + break;
>>> + case 20 * MHZ:
>>> + clksel = EXYNOS5_FSEL_20MHZ;
>>> + break;
>>> + case 24 * MHZ:
>>> + clksel = EXYNOS5_FSEL_24MHZ;
>>> + break;
>>> + case 50 * MHZ:
>>> + clksel = EXYNOS5_FSEL_50MHZ;
>>> + break;
>>> + default:
>>> + clksel = CLKSEL_ERROR;
>>> + }
>>> +
>>> + return clksel;
>>> +}
>>> +
>>> +static void exynos5_usb3phy_isol(struct usb3phy_instance *inst, bool
>>> +on) {
>>> + struct usb3phy_driver *drv = inst->drv;
>>> + u32 tmp;
>>> +
>>> + if (!drv->reg_isol)
>>> + return;
>>> +
>>> + tmp = readl(drv->reg_isol);
>>> + if (on)
>>> + tmp &= ~EXYNOS5_USB_ISOL_DRD;
>>> + else
>>> + tmp |= EXYNOS5_USB_ISOL_DRD;
>>> + writel(tmp, drv->reg_isol);
>>> +}
>>> +
>>> +/*
>>> + * Sets the phy clk as EXTREFCLK (XXTI) which is internal clock from
>> clock core.
>>> + */
>>> +static u32 exynos5_usb3phy_set_refclk(struct usb3phy_instance *inst)
>>> +{
>>> + u32 reg;
>>> + u32 refclk;
>>> +
>>> + refclk = inst->clk;
>>> +
>>> + reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
>>> + PHYCLKRST_FSEL(refclk);
>>> +
>>> + switch (refclk) {
>>> + case EXYNOS5_FSEL_50MHZ:
>>> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
>>> + PHYCLKRST_SSC_REFCLKSEL(0x00));
>>> + 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;
>>> + case EXYNOS5_FSEL_24MHZ:
>>> + default:
>>> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
>>> + PHYCLKRST_SSC_REFCLKSEL(0x88));
>>> + break;
>>> + }
>>> +
>>> + return reg;
>>> +}
>>> +
>>> +static void exynos5_usb3phy_init(struct usb3phy_instance *inst) {
>>> + struct usb3phy_driver *drv = inst->drv;
>>> + u32 phyparam0;
>>> + u32 phyparam1;
>>> + u32 linksystem;
>>> + u32 phybatchg;
>>> + u32 phytest;
>>> + u32 phyclkrst;
>>> +
>>> + /* Reset USB 3.0 PHY */
>>> + writel(0x0, drv->reg_phy + EXYNOS5_DRD_PHYREG0);
>>> +
>>> + phyparam0 = readl(drv->reg_phy + EXYNOS5_DRD_PHYPARAM0);
>>> + /* Select PHY CLK source */
>>> + phyparam0 &= ~PHYPARAM0_REF_USE_PAD;
>>> + /* Set Loss-of-Signal Detector sensitivity */
>>> + phyparam0 &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
>>> + phyparam0 |= PHYPARAM0_REF_LOSLEVEL;
>>> + writel(phyparam0, drv->reg_phy + EXYNOS5_DRD_PHYPARAM0);
>>> +
>>> + writel(0x0, drv->reg_phy + EXYNOS5_DRD_PHYRESUME);
>>> +
>>> + /*
>>> + * Setting the Frame length Adj value[6:1] to default 0x20
>>> + * See xHCI 1.0 spec, 5.2.4
>>> + */
>>> + linksystem = LINKSYSTEM_XHCI_VERSION_CONTROL |
>>> + LINKSYSTEM_FLADJ(0x20);
>>> + writel(linksystem, drv->reg_phy + EXYNOS5_DRD_LINKSYSTEM);
>>> +
>>> + phyparam1 = readl(drv->reg_phy + EXYNOS5_DRD_PHYPARAM1);
>>> + /* Set Tx De-Emphasis level */
>>> + phyparam1 &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
>>> + phyparam1 |= PHYPARAM1_PCS_TXDEEMPH;
>>> + writel(phyparam1, drv->reg_phy + EXYNOS5_DRD_PHYPARAM1);
>>> +
>>> + phybatchg = readl(drv->reg_phy + EXYNOS5_DRD_PHYBATCHG);
>>> + phybatchg |= PHYBATCHG_UTMI_CLKSEL;
>>> + writel(phybatchg, drv->reg_phy + EXYNOS5_DRD_PHYBATCHG);
>>> +
>>> + /* PHYTEST POWERDOWN Control */
>>> + phytest = readl(drv->reg_phy + EXYNOS5_DRD_PHYTEST);
>>> + phytest &= ~(PHYTEST_POWERDOWN_SSP |
>>> + PHYTEST_POWERDOWN_HSP);
>>> + writel(phytest, drv->reg_phy + EXYNOS5_DRD_PHYTEST);
>>> +
>>> + /* UTMI Power Control */
>>> + writel(PHYUTMI_OTGDISABLE, drv->reg_phy + EXYNOS5_DRD_PHYUTMI);
>>> +
>>> + phyclkrst = exynos5_usb3phy_set_refclk(inst);
>>> +
>>> + phyclkrst |= PHYCLKRST_PORTRESET |
>>> + /* Digital power supply in normal operating mode */
>>> + 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;
>>> +
>>> + writel(phyclkrst, drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
>>> +
>>> + udelay(10);
>>> +
>>> + phyclkrst &= ~PHYCLKRST_PORTRESET;
>>> + writel(phyclkrst, drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
>>> +
>>> +}
>>> +
>>> +static void exynos5_usb3phy_exit(struct usb3phy_instance *inst) {
>>> + struct usb3phy_driver *drv = inst->drv;
>>> + u32 phyutmi;
>>> + u32 phyclkrst;
>>> + u32 phytest;
>>> +
>>> + phyutmi = PHYUTMI_OTGDISABLE |
>>> + PHYUTMI_FORCESUSPEND |
>>> + PHYUTMI_FORCESLEEP;
>>> + writel(phyutmi, drv->reg_phy + EXYNOS5_DRD_PHYUTMI);
>>> +
>>> + /* Resetting the PHYCLKRST enable bits to reduce leakage current
>> */
>>> + phyclkrst = readl(drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
>>> + phyclkrst &= ~(PHYCLKRST_REF_SSP_EN |
>>> + PHYCLKRST_SSC_EN |
>>> + PHYCLKRST_COMMONONN);
>>> + writel(phyclkrst, drv->reg_phy + EXYNOS5_DRD_PHYCLKRST);
>>> +
>>> + /* Control PHYTEST to remove leakage current */
>>> + phytest = readl(drv->reg_phy + EXYNOS5_DRD_PHYTEST);
>>> + phytest |= PHYTEST_POWERDOWN_SSP |
>>> + PHYTEST_POWERDOWN_HSP;
>>> + writel(phytest, drv->reg_phy + EXYNOS5_DRD_PHYTEST); }
>>> +
>>> +static int exynos5_usb3phy_power_on(struct phy *phy) {
>>> + struct usb3phy_instance *inst = phy_get_drvdata(phy);
>>> + struct usb3phy_driver *drv = inst->drv;
>>> + int ret;
>>> +
>>> + dev_info(drv->dev, "Request to power_on \"%s\" usb phy\n",
>>> + inst->label);
>>> +
>>> + if (drv->sclk_usbphy30)
>>> + clk_prepare_enable(drv->sclk_usbphy30);
>>> +
>>> + ret = clk_prepare_enable(drv->clk);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + if (inst->state == STATE_ON) {
>>> + dev_err(drv->dev, "usb phy \"%s\" already on",
>>> + inst->label);
>>> + ret = -ENODEV;
>>> + goto err0;
>>> + }
>>> +
>>> + inst->state = STATE_ON;
>>> +
>>> + /* Initialize the PHY and power it ON */
>>> + exynos5_usb3phy_init(inst);
>>> + exynos5_usb3phy_isol(inst, 0);
>>> +
>>> +err0:
>>> + clk_disable_unprepare(drv->clk);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static int exynos5_usb3phy_power_off(struct phy *phy) {
>>> + struct usb3phy_instance *inst = phy_get_drvdata(phy);
>>> + struct usb3phy_driver *drv = inst->drv;
>>> + int ret;
>>> +
>>> + dev_info(drv->dev, "Request to power_off \"%s\" usb phy\n",
>>> + inst->label);
>>> + ret = clk_prepare_enable(drv->clk);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + if (inst->state == STATE_OFF) {
>>> + dev_err(drv->dev, "usb phy \"%s\" already off",
>>> + inst->label);
>>> + ret = -ENODEV;
>>> + goto err0;
>>> + }
>>> +
>>> + inst->state = STATE_OFF;
>>> +
>>> + /* Power-off the PHY and de-initialize it */
>>> + exynos5_usb3phy_isol(inst, 1);
>>> + exynos5_usb3phy_exit(inst);
>>> +
>>> +err0:
>>> + clk_disable_unprepare(drv->clk);
>>> + if (drv->sclk_usbphy30)
>>> + clk_disable_unprepare(drv->sclk_usbphy30);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static struct phy_ops exynos5_usb3phy_ops = {
>>> + .power_on = exynos5_usb3phy_power_on,
>>> + .power_off = exynos5_usb3phy_power_off,
>>> + .owner = THIS_MODULE,
>>> +};
>>> +
>>> +static const struct of_device_id exynos5_usb3phy_of_match[];
>>> +
>>> +static int exynos5_usb3phy_probe(struct platform_device *pdev) {
>>> + struct device *dev = &pdev->dev;
>>> + struct usb3phy_driver *drv;
>>> + struct usb3phy_instance *inst;
>>> + struct phy_provider *phy_provider;
>>> + struct resource *res;
>>> + struct clk *clk;
>>> + const struct of_device_id *match;
>>> + const struct usb3phy_config *cfg;
>>> +
>>> + match = of_match_node(exynos5_usb3phy_of_match, pdev-
>>> dev.of_node);
>>> + if (!match) {
>>> + dev_err(dev, "of_match_node() failed\n");
>>> + return -EINVAL;
>>> + }
>>> + cfg = match->data;
>>> + if (!cfg) {
>>> + dev_err(dev, "Failed to get configuration\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + drv = devm_kzalloc(dev, sizeof(struct usb3phy_driver),
>> GFP_KERNEL);
>>> + if (!drv) {
>>> + dev_err(dev, "Failed to allocate memory\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + dev_set_drvdata(dev, drv);
>>> + drv->dev = dev;
>>> +
>>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> + drv->reg_phy = devm_ioremap_resource(dev, res);
>>> + if (IS_ERR(drv->reg_phy)) {
>>> + dev_err(dev, "Failed to map register memory (phy)\n");
>>> + return PTR_ERR(drv->reg_phy);
>>> + }
>>> +
>>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>>> + drv->reg_isol = devm_ioremap_resource(dev, res);
>>> + if (IS_ERR(drv->reg_isol)) {
>>> + dev_err(dev, "Failed to map register memory (isolation)\n");
>>> + return PTR_ERR(drv->reg_isol);
>>> + }
>>> +
>>> + phy_provider = devm_of_phy_provider_register(dev,
>> of_phy_simple_xlate);
>>> + if (IS_ERR(phy_provider)) {
>>> + dev_err(drv->dev, "Failed to register phy provider\n");
>>> + return PTR_ERR(phy_provider);
>>> + }
>>> +
>>> + drv->clk = devm_clk_get(dev, "phy");
>>> + if (IS_ERR(drv->clk)) {
>>> + dev_err(dev, "Failed to get clock of phy controller\n");
>>> + return PTR_ERR(drv->clk);
>>> + }
>>> +
>>> + /*
>>> + * Exysno5420 SoC has an additional special clock, used for
>>> + * for USB 3.0 PHY operation, this clock goes to the PHY block
>>> + * as a reference clock to clock generation block of the
>> controller.
>>> + */
>>> + if (cfg->has_sclk_usbphy30) {
>>> + drv->sclk_usbphy30 = devm_clk_get(dev, "sclk_usbphy30");
>>> + if (IS_ERR(drv->clk)) {
>>> + dev_err(dev, "Failed to get phy reference clock\n");
>>> + return PTR_ERR(drv->clk);
>>> + }
>>> + }
>>> +
>>> + inst = &drv->instance;
>>> + inst->drv = drv;
>>> + inst->label = "usb3drd";
>>> +
>>> + dev_info(dev, "Creating phy \"%s\"\n", inst->label);
>>> + inst->phy = devm_phy_create(dev, &exynos5_usb3phy_ops, NULL);
>>> + if (IS_ERR(inst->phy)) {
>>> + dev_err(drv->dev, "Failed to create usb3phy \"%s\"\n",
>>> + inst->label);
>>> + return PTR_ERR(inst->phy);
>>> + }
>>> +
>>> + phy_set_drvdata(inst->phy, inst);
>>> +
>>> + clk = clk_get(dev, inst->label);
>>> + if (IS_ERR(clk)) {
>>> + dev_err(dev, "Failed to get clock of \"%s\" phy\n",
>>> + inst->label);
>>> + return PTR_ERR(clk);
>>> + }
>>> +
>>> + inst->rate = clk_get_rate(clk);
>>> +
>>> + inst->clk = exynos5_rate_to_clk(inst->rate);
>>> + if (inst->clk == CLKSEL_ERROR) {
>>> + dev_err(dev, "Clock rate (%ld) not supported\n",
>>> + inst->rate);
>>> + clk_put(clk);
>>> + return -EINVAL;
>>> + }
>>> + clk_put(clk);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +const struct usb3phy_config exynos5420_usb3phy_cfg = {
>>> + .cpu = TYPE_EXYNOS5420,
>>> + .has_sclk_usbphy30 = true,
>>> +};
>>> +
>>> +const struct usb3phy_config exynos5250_usb3phy_cfg = {
>>> + .cpu = TYPE_EXYNOS5250,
>>> + .has_sclk_usbphy30 = false,
>>> +};
>>> +
>>> +static const struct of_device_id exynos5_usb3phy_of_match[] = {
>>> + {
>>> + .compatible = "samsung,exynos5250-usb3phy",
>>> + .data = &exynos5250_usb3phy_cfg
>>> + }, {
>>> + .compatible = "samsung,exynos5420-usb3phy",
>>> + .data = &exynos5420_usb3phy_cfg
>>> + },
>>> + { },
>>> +};
>>> +
>>> +static struct platform_driver exynos5_usb3phy_driver = {
>>> + .probe = exynos5_usb3phy_probe,
>>> + .driver = {
>>> + .of_match_table = exynos5_usb3phy_of_match,
>>> + .name = "exynos5-usb3phy",
>>> + .owner = THIS_MODULE,
>>> + }
>>> +};
>>> +
>>> +module_platform_driver(exynos5_usb3phy_driver);
>>> +MODULE_DESCRIPTION("Samsung EXYNOS5 series SoC USB 3.0 PHY driver");
>>> +MODULE_AUTHOR("Vivek Gautam <gautam.vivek@...sung.com>");
>>> +MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:exynos5-usb3phy");
>>>
>
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