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Date: Tue, 29 Jan 2013 11:05:15 +0530
From: Vivek Gautam <gautamvivek1987@...il.com>
To: linux-usb@...r.kernel.org
Cc: Doug Anderson <dianders@...omium.org>,
linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
linux-samsung-soc@...r.kernel.org, gregkh@...uxfoundation.org,
balbi@...com, kgene.kim@...sung.com, grant.likely@...retlab.ca,
sylvester.nawrocki@...il.com, tomasz.figa@...il.com,
av.tikhomirov@...sung.com, p.paneri@...sung.com,
Vivek Gautam <gautam.vivek@...sung.com>
Subject: Re: [PATCH v4 2/2] usb: phy: samsung: Add PHY support for USB 3.0 controller
CC: Doug Anderson
On Mon, Jan 28, 2013 at 3:56 PM, Vivek Gautam <gautam.vivek@...sung.com> wrote:
> Adding PHY driver support for USB 3.0 controller for Samsung's
> SoCs.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> ---
>
> Changes from v3:
> - Making SAMSUNG_USB3PHY dependent on SAMSUNG_USBPHY.
> - Adding USB_DWC3 to dependencies of SAMSUNG_USB2PHY since
> dwc3 controller also looks for USB2 type PHY.
>
> drivers/usb/phy/Kconfig | 11 +-
> drivers/usb/phy/Makefile | 1 +
> drivers/usb/phy/samsung-usb3.c | 349 ++++++++++++++++++++++++++++++++++++++
> drivers/usb/phy/samsung-usbphy.h | 81 +++++++++
> 4 files changed, 441 insertions(+), 1 deletions(-)
> create mode 100644 drivers/usb/phy/samsung-usb3.c
>
> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> index cc0d230..9325a95 100644
> --- a/drivers/usb/phy/Kconfig
> +++ b/drivers/usb/phy/Kconfig
> @@ -52,14 +52,23 @@ config SAMSUNG_USBPHY
> help
> Enable this to support Samsung USB phy controllers for Samsung
> SoCs.
> + Further enable USB 2.0 type PHY or USB 3.0 type PHY as required
> + for USB controllers in use.
>
> if SAMSUNG_USBPHY
>
> config SAMSUNG_USB2PHY
> bool "Samsung USB 2.0 PHY controller Driver"
> - depends on USB_S3C_HSOTG || USB_EHCI_S5P || USB_OHCI_EXYNOS
> + depends on USB_S3C_HSOTG || USB_EHCI_S5P || USB_OHCI_EXYNOS || USB_DWC3
> help
> Enable this to support Samsung USB 2.0 (High Speed) phy controller
> for Samsung SoCs.
>
> +config SAMSUNG_USB3PHY
> + bool "Samsung USB 3.0 PHY controller Driver"
> + depends on USB_DWC3
> + help
> + Enable this to support Samsung USB 3.0 (Super Speed) phy controller
> + for samsung SoCs.
> +
> endif
> diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
> index 7ba9862..b8505ac 100644
> --- a/drivers/usb/phy/Makefile
> +++ b/drivers/usb/phy/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o
> obj-$(CONFIG_USB_RCAR_PHY) += rcar-phy.o
> obj-$(CONFIG_SAMSUNG_USBPHY) += samsung-usbphy.o
> obj-$(CONFIG_SAMSUNG_USB2PHY) += samsung-usb2.o
> +obj-$(CONFIG_SAMSUNG_USB3PHY) += samsung-usb3.o
> diff --git a/drivers/usb/phy/samsung-usb3.c b/drivers/usb/phy/samsung-usb3.c
> new file mode 100644
> index 0000000..29e1321
> --- /dev/null
> +++ b/drivers/usb/phy/samsung-usb3.c
> @@ -0,0 +1,349 @@
> +/* linux/drivers/usb/phy/samsung-usb3.c
> + *
> + * Copyright (c) 2012 Samsung Electronics Co., Ltd.
> + * http://www.samsung.com
> + *
> + * Author: Vivek Gautam <gautam.vivek@...sung.com>
> + *
> + * Samsung USB 3.0 PHY transceiver; talks to DWC3 controller.
> + *
> + * 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.
> + *
> + * 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/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/usb/samsung_usb_phy.h>
> +#include <linux/platform_data/samsung-usbphy.h>
> +
> +#include "samsung-usbphy.h"
> +
> +/*
> + * Sets the phy clk as EXTREFCLK (XXTI) which is internal clock from clock core.
> + */
> +static u32 samsung_usb3_phy_set_refclk(struct samsung_usbphy *sphy)
> +{
> + u32 reg;
> + u32 refclk;
> +
> + refclk = sphy->ref_clk_freq;
> +
> + reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
> + PHYCLKRST_FSEL(refclk);
> +
> + switch (refclk) {
> + case FSEL_CLKSEL_50M:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x00));
> + break;
> + case FSEL_CLKSEL_20M:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x00));
> + break;
> + case FSEL_CLKSEL_19200K:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x88));
> + break;
> + case FSEL_CLKSEL_24M:
> + default:
> + reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
> + PHYCLKRST_SSC_REFCLKSEL(0x88));
> + break;
> + }
> +
> + return reg;
> +}
> +
> +static int samsung_exynos5_usb3_phy_enable(struct samsung_usbphy *sphy)
> +{
> + void __iomem *regs = sphy->regs;
> + u32 phyparam0;
> + u32 phyparam1;
> + u32 linksystem;
> + u32 phybatchg;
> + u32 phytest;
> + u32 phyclkrst;
> +
> + /* Reset USB 3.0 PHY */
> + writel(0x0, regs + EXYNOS5_DRD_PHYREG0);
> +
> + phyparam0 = readl(regs + 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, regs + EXYNOS5_DRD_PHYPARAM0);
> +
> + writel(0x0, regs + 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, regs + EXYNOS5_DRD_LINKSYSTEM);
> +
> + phyparam1 = readl(regs + EXYNOS5_DRD_PHYPARAM1);
> + /* Set Tx De-Emphasis level */
> + phyparam1 &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
> + phyparam1 |= PHYPARAM1_PCS_TXDEEMPH;
> + writel(phyparam1, regs + EXYNOS5_DRD_PHYPARAM1);
> +
> + phybatchg = readl(regs + EXYNOS5_DRD_PHYBATCHG);
> + phybatchg |= PHYBATCHG_UTMI_CLKSEL;
> + writel(phybatchg, regs + EXYNOS5_DRD_PHYBATCHG);
> +
> + /* PHYTEST POWERDOWN Control */
> + phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
> + phytest &= ~(PHYTEST_POWERDOWN_SSP |
> + PHYTEST_POWERDOWN_HSP);
> + writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
> +
> + /* UTMI Power Control */
> + writel(PHYUTMI_OTGDISABLE, regs + EXYNOS5_DRD_PHYUTMI);
> +
> + phyclkrst = samsung_usb3_phy_set_refclk(sphy);
> +
> + 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, regs + EXYNOS5_DRD_PHYCLKRST);
> +
> + udelay(10);
> +
> + phyclkrst &= ~(PHYCLKRST_PORTRESET);
> + writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
> +
> + return 0;
> +}
> +
> +static void samsung_exynos5_usb3_phy_disable(struct samsung_usbphy *sphy)
> +{
> + u32 phyutmi;
> + u32 phyclkrst;
> + u32 phytest;
> + void __iomem *regs = sphy->regs;
> +
> + phyutmi = PHYUTMI_OTGDISABLE |
> + PHYUTMI_FORCESUSPEND |
> + PHYUTMI_FORCESLEEP;
> + writel(phyutmi, regs + EXYNOS5_DRD_PHYUTMI);
> +
> + /* Resetting the PHYCLKRST enable bits to reduce leakage current */
> + phyclkrst = readl(regs + EXYNOS5_DRD_PHYCLKRST);
> + phyclkrst &= ~(PHYCLKRST_REF_SSP_EN |
> + PHYCLKRST_SSC_EN |
> + PHYCLKRST_COMMONONN);
> + writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
> +
> + /* Control PHYTEST to remove leakage current */
> + phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
> + phytest |= (PHYTEST_POWERDOWN_SSP |
> + PHYTEST_POWERDOWN_HSP);
> + writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
> +}
> +
> +static int samsung_usb3_phy_init(struct usb_phy *phy)
> +{
> + struct samsung_usbphy *sphy;
> + unsigned long flags;
> + int ret = 0;
> +
> + sphy = phy_to_sphy(phy);
> +
> + /* Enable the phy clock */
> + ret = clk_prepare_enable(sphy->clk);
> + if (ret) {
> + dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
> + return ret;
> + }
> +
> + spin_lock_irqsave(&sphy->lock, flags);
> +
> + /* setting default phy-type for USB 3.0 */
> + samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
> +
> + /* Disable phy isolation */
> + samsung_usbphy_set_isolation(sphy, false);
> +
> + /* Initialize usb phy registers */
> + samsung_exynos5_usb3_phy_enable(sphy);
> +
> + spin_unlock_irqrestore(&sphy->lock, flags);
> +
> + /* Disable the phy clock */
> + clk_disable_unprepare(sphy->clk);
> +
> + return ret;
> +}
> +
> +/*
> + * The function passed to the usb driver for phy shutdown
> + */
> +static void samsung_usb3_phy_shutdown(struct usb_phy *phy)
> +{
> + struct samsung_usbphy *sphy;
> + unsigned long flags;
> +
> + sphy = phy_to_sphy(phy);
> +
> + if (clk_prepare_enable(sphy->clk)) {
> + dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
> + return;
> + }
> +
> + spin_lock_irqsave(&sphy->lock, flags);
> +
> + /* setting default phy-type for USB 3.0 */
> + samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
> +
> + /* De-initialize usb phy registers */
> + samsung_exynos5_usb3_phy_disable(sphy);
> +
> + /* Enable phy isolation */
> + samsung_usbphy_set_isolation(sphy, true);
> +
> + spin_unlock_irqrestore(&sphy->lock, flags);
> +
> + clk_disable_unprepare(sphy->clk);
> +}
> +
> +static int samsung_usb3_phy_probe(struct platform_device *pdev)
> +{
> + struct samsung_usbphy *sphy;
> + struct samsung_usbphy_data *pdata = pdev->dev.platform_data;
> + struct device *dev = &pdev->dev;
> + struct resource *phy_mem;
> + void __iomem *phy_base;
> + struct clk *clk;
> + int ret;
> +
> + phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!phy_mem) {
> + dev_err(dev, "%s: missing mem resource\n", __func__);
> + return -ENODEV;
> + }
> +
> + phy_base = devm_request_and_ioremap(dev, phy_mem);
> + if (!phy_base) {
> + dev_err(dev, "%s: register mapping failed\n", __func__);
> + return -ENXIO;
> + }
> +
> + sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
> + if (!sphy)
> + return -ENOMEM;
> +
> + clk = devm_clk_get(dev, "usbdrd30");
> + if (IS_ERR(clk)) {
> + dev_err(dev, "Failed to get device clock\n");
> + return PTR_ERR(clk);
> + }
> +
> + sphy->dev = dev;
> +
> + if (dev->of_node) {
> + ret = samsung_usbphy_parse_dt(sphy);
> + if (ret < 0)
> + return ret;
> + } else {
> + if (!pdata) {
> + dev_err(dev, "no platform data specified\n");
> + return -EINVAL;
> + }
> + }
> +
> + sphy->plat = pdata;
> + sphy->regs = phy_base;
> + sphy->clk = clk;
> + sphy->phy.dev = sphy->dev;
> + sphy->phy.label = "samsung-usb3-phy";
> + sphy->phy.init = samsung_usb3_phy_init;
> + sphy->phy.shutdown = samsung_usb3_phy_shutdown;
> + sphy->drv_data = samsung_usbphy_get_driver_data(pdev);
> + sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy);
> +
> + spin_lock_init(&sphy->lock);
> +
> + platform_set_drvdata(pdev, sphy);
> +
> + return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB3);
> +}
> +
> +static int samsung_usb3_phy_remove(struct platform_device *pdev)
> +{
> + struct samsung_usbphy *sphy = platform_get_drvdata(pdev);
> +
> + usb_remove_phy(&sphy->phy);
> +
> + if (sphy->pmuregs)
> + iounmap(sphy->pmuregs);
> + if (sphy->sysreg)
> + iounmap(sphy->sysreg);
> +
> + return 0;
> +}
> +
> +static struct samsung_usbphy_drvdata usb3_phy_exynos5 = {
> + .cpu_type = TYPE_EXYNOS5250,
> + .devphy_en_mask = EXYNOS_USBPHY_ENABLE,
> +};
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id samsung_usbphy_dt_match[] = {
> + {
> + .compatible = "samsung,exynos5250-usb3-phy",
> + .data = &usb3_phy_exynos5
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
> +#endif
> +
> +static struct platform_device_id samsung_usbphy_driver_ids[] = {
> + {
> + .name = "exynos5250-usb3-phy",
> + .driver_data = (unsigned long)&usb3_phy_exynos5,
> + },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids);
> +
> +static struct platform_driver samsung_usb3_phy_driver = {
> + .probe = samsung_usb3_phy_probe,
> + .remove = samsung_usb3_phy_remove,
> + .id_table = samsung_usbphy_driver_ids,
> + .driver = {
> + .name = "samsung-usb3-phy",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(samsung_usbphy_dt_match),
> + },
> +};
> +
> +module_platform_driver(samsung_usb3_phy_driver);
> +
> +MODULE_DESCRIPTION("Samsung USB 3.0 phy controller");
> +MODULE_AUTHOR("Vivek Gautam <gautam.vivek@...sung.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:samsung-usb3-phy");
> diff --git a/drivers/usb/phy/samsung-usbphy.h b/drivers/usb/phy/samsung-usbphy.h
> index 969632b..f7e657d 100644
> --- a/drivers/usb/phy/samsung-usbphy.h
> +++ b/drivers/usb/phy/samsung-usbphy.h
> @@ -145,6 +145,87 @@
>
> #define EXYNOS5_PHY_OTG_TUNE (0x40)
>
> +/* EXYNOS5: USB 3.0 DRD */
> +#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)
> +
> +
> #ifndef MHZ
> #define MHZ (1000*1000)
> #endif
> --
> 1.7.6.5
>
> --
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--
Thanks & Regards
Vivek
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