Hi Praveen, See some minor comments inline. On Wednesday 14 of November 2012 15:57:15 Praveen Paneri wrote: > This driver uses usb_phy interface to interact with s3c-hsotg. Supports > phy_init and phy_shutdown functions to enable/disable usb phy. Support > will be extended to host controllers and more Samsung SoCs. > > Signed-off-by: Praveen Paneri <p.paneri@xxxxxxxxxxx> > Acked-by: Heiko Stuebner <heiko@xxxxxxxxx> > Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > --- > .../devicetree/bindings/usb/samsung-usbphy.txt | 11 + > drivers/usb/phy/Kconfig | 8 + > drivers/usb/phy/Makefile | 1 + > drivers/usb/phy/samsung-usbphy.c | 360 > ++++++++++++++++++++ include/linux/platform_data/samsung-usbphy.h > | 27 ++ > 5 files changed, 407 insertions(+), 0 deletions(-) > create mode 100644 > Documentation/devicetree/bindings/usb/samsung-usbphy.txt create mode > 100644 drivers/usb/phy/samsung-usbphy.c > create mode 100644 include/linux/platform_data/samsung-usbphy.h > > diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt new file > mode 100644 > index 0000000..7b26e2d > --- /dev/null > +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > @@ -0,0 +1,11 @@ > +* Samsung's usb phy transceiver > + > +The Samsung's phy transceiver is used for controlling usb otg phy for > +s3c-hsotg usb device controller. > +TODO: Adding the PHY binding with controller(s) according to the under > +developement generic PHY driver. > + > +Required properties: > +- compatible : should be "samsung,exynos4210-usbphy" > +- reg : base physical address of the phy registers and length of memory > mapped + region. > diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig > index 7eb73c5..17ad743 100644 > --- a/drivers/usb/phy/Kconfig > +++ b/drivers/usb/phy/Kconfig > @@ -44,3 +44,11 @@ config USB_RCAR_PHY > > To compile this driver as a module, choose M here: the > module will be called rcar-phy. > + > +config SAMSUNG_USBPHY > + bool "Samsung USB PHY controller Driver" > + depends on USB_S3C_HSOTG > + select USB_OTG_UTILS > + help > + Enable this to support Samsung USB phy controller for samsung > + SoCs. > diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile > index 1a579a8..ec304f6 100644 > --- a/drivers/usb/phy/Makefile > +++ b/drivers/usb/phy/Makefile > @@ -9,3 +9,4 @@ obj-$(CONFIG_USB_ISP1301) += isp1301.o > obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o > obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o > obj-$(CONFIG_USB_RCAR_PHY) += rcar-phy.o > +obj-$(CONFIG_SAMSUNG_USBPHY) += samsung-usbphy.o > diff --git a/drivers/usb/phy/samsung-usbphy.c > b/drivers/usb/phy/samsung-usbphy.c new file mode 100644 > index 0000000..3c84aab > --- /dev/null > +++ b/drivers/usb/phy/samsung-usbphy.c > @@ -0,0 +1,360 @@ > +/* linux/drivers/usb/phy/samsung-usbphy.c > + * > + * Copyright (c) 2012 Samsung Electronics Co., Ltd. > + * http://www.samsung.com > + * > + * Author: Praveen Paneri <p.paneri@xxxxxxxxxxx> > + * > + * Samsung USB2.0 High-speed OTG transceiver, talks to S3C HS OTG > 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/otg.h> > +#include <linux/platform_data/samsung-usbphy.h> > + > +/* Register definitions */ > + > +#define SAMSUNG_PHYPWR (0x00) > + > +#define PHYPWR_NORMAL_MASK (0x19 << 0) > +#define PHYPWR_OTG_DISABLE (0x1 << 4) > +#define PHYPWR_ANALOG_POWERDOWN (0x1 << 3) > +#define PHYPWR_FORCE_SUSPEND (0x1 << 1) > +/* For Exynos4 */ > +#define PHYPWR_NORMAL_MASK_PHY0 (0x39 << 0) > +#define PHYPWR_SLEEP_PHY0 (0x1 << 5) > + > +#define SAMSUNG_PHYCLK (0x04) > + > +#define PHYCLK_MODE_USB11 (0x1 << 6) > +#define PHYCLK_EXT_OSC (0x1 << 5) > +#define PHYCLK_COMMON_ON_N (0x1 << 4) > +#define PHYCLK_ID_PULL (0x1 << 2) > +#define PHYCLK_CLKSEL_MASK (0x3 << 0) > +#define PHYCLK_CLKSEL_48M (0x0 << 0) > +#define PHYCLK_CLKSEL_12M (0x2 << 0) > +#define PHYCLK_CLKSEL_24M (0x3 << 0) > + > +#define SAMSUNG_RSTCON (0x08) > + > +#define RSTCON_PHYLINK_SWRST (0x1 << 2) > +#define RSTCON_HLINK_SWRST (0x1 << 1) > +#define RSTCON_SWRST (0x1 << 0) > + > +#ifndef MHZ > +#define MHZ (1000*1000) > +#endif > + > +enum samsung_cpu_type { > + TYPE_S3C64XX, > + TYPE_EXYNOS4210, > +}; > + > +/* > + * struct samsung_usbphy - transceiver driver state > + * @phy: transceiver structure > + * @plat: platform data > + * @dev: The parent device supplied to the probe function > + * @clk: usb phy clock > + * @regs: usb phy register memory base > + * @ref_clk_freq: reference clock frequency selection > + * @cpu_type: machine identifier > + */ > +struct samsung_usbphy { > + struct usb_phy phy; > + struct samsung_usbphy_data *plat; > + struct device *dev; > + struct clk *clk; > + void __iomem *regs; > + int ref_clk_freq; > + int cpu_type; > +}; > + > +#define phy_to_sphy(x) container_of((x), struct samsung_usbphy, phy) > + > +/* > + * Returns reference clock frequency selection value > + */ > +static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy) > +{ > + struct clk *ref_clk; > + int refclk_freq = 0; > + > + ref_clk = clk_get(sphy->dev, "xusbxti"); > + if (IS_ERR(ref_clk)) { > + dev_err(sphy->dev, "Failed to get reference clock\n"); > + return PTR_ERR(ref_clk); > + } > + > + switch (clk_get_rate(ref_clk)) { > + case 12 * MHZ: > + refclk_freq = PHYCLK_CLKSEL_12M; > + break; > + case 24 * MHZ: > + refclk_freq = PHYCLK_CLKSEL_24M; > + break; > + case 48 * MHZ: > + refclk_freq = PHYCLK_CLKSEL_48M; > + break; > + default: > + if (sphy->cpu_type == TYPE_S3C64XX) > + refclk_freq = PHYCLK_CLKSEL_48M; > + else > + refclk_freq = PHYCLK_CLKSEL_24M; > + break; > + } > + clk_put(ref_clk); > + > + return refclk_freq; > +} > + > +static void samsung_usbphy_enable(struct samsung_usbphy *sphy) > +{ > + void __iomem *regs = sphy->regs; > + u32 phypwr; > + u32 phyclk; > + u32 rstcon; > + > + /* set clock frequency for PLL */ > + phyclk = sphy->ref_clk_freq; > + phypwr = readl(regs + SAMSUNG_PHYPWR); > + rstcon = readl(regs + SAMSUNG_RSTCON); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phyclk &= ~PHYCLK_COMMON_ON_N; > + phypwr &= ~PHYPWR_NORMAL_MASK; > + rstcon |= RSTCON_SWRST; > + break; > + case TYPE_EXYNOS4210: > + phypwr &= ~PHYPWR_NORMAL_MASK_PHY0; > + rstcon |= RSTCON_SWRST; > + default: > + break; > + } > + > + writel(phyclk, regs + SAMSUNG_PHYCLK); > + /* set to normal of PHY0 */ I don't understand this comment. > + writel(phypwr, regs + SAMSUNG_PHYPWR); > + /* reset all ports of PHY and Link */ > + writel(rstcon, regs + SAMSUNG_RSTCON); > + udelay(10); > + rstcon &= ~RSTCON_SWRST; > + writel(rstcon, regs + SAMSUNG_RSTCON); > +} > + > +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) > +{ > + void __iomem *regs = sphy->regs; > + u32 phypwr; > + > + phypwr = readl(regs + SAMSUNG_PHYPWR); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phypwr |= PHYPWR_NORMAL_MASK; > + break; > + case TYPE_EXYNOS4210: > + phypwr |= PHYPWR_NORMAL_MASK_PHY0; > + default: > + break; > + } > + > + /* unset to normal of PHY0 */ I don't understand this comment. > + writel(phypwr, regs + SAMSUNG_PHYPWR); > +} > + > +/* > + * The function passed to the usb driver for phy initialization > + */ > +static int samsung_usbphy_init(struct usb_phy *phy) > +{ > + struct samsung_usbphy *sphy; > + 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; > + } > + > + /* Disable phy isolation */ > + if (sphy->plat && sphy->plat->pmu_isolation) > + sphy->plat->pmu_isolation(false); > + > + /* Initialize usb phy registers */ > + samsung_usbphy_enable(sphy); > + > + /* Disable the phy clock */ > + clk_disable_unprepare(sphy->clk); > + return ret; > +} > + > +/* > + * The function passed to the usb driver for phy shutdown > + */ > +static void samsung_usbphy_shutdown(struct usb_phy *phy) > +{ > + struct samsung_usbphy *sphy; > + > + sphy = phy_to_sphy(phy); > + > + if (clk_prepare_enable(sphy->clk)) { > + dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__); > + return; > + } > + > + /* De-initialize usb phy registers */ > + samsung_usbphy_disable(sphy); > + > + /* Enable phy isolation */ > + if (sphy->plat && sphy->plat->pmu_isolation) > + sphy->plat->pmu_isolation(true); > + > + clk_disable_unprepare(sphy->clk); > +} > + > +static const struct of_device_id samsung_usbphy_dt_match[]; > + > +static inline int samsung_usbphy_get_driver_data(struct platform_device > *pdev) +{ > + if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) { if (pdev->dev.of_node) { CONFIG_OF is not needed to check whether dev.of_node is not NULL and if dev.of_node is always NULL with CONFIG_OF disabled, so this check is enough. > + int data; You can remove this variable and... > + const struct of_device_id *match; > + match = of_match_node(samsung_usbphy_dt_match, > + pdev->dev.of_node); > + data = (int) match->data; > + return data; return (int) match->data; > + } > + > + return platform_get_device_id(pdev)->driver_data; > +} > + > +static int __devinit samsung_usbphy_probe(struct platform_device *pdev) > +{ > + struct samsung_usbphy *sphy; > + struct samsung_usbphy_data *pdata; > + struct device *dev = &pdev->dev; > + struct resource *phy_mem; > + void __iomem *phy_base; > + struct clk *clk; > + int ret = 0; > + > + pdata = pdev->dev.platform_data; > + if (!pdata) { > + dev_err(&pdev->dev, "%s: no platform data defined\n", __func__); > + return -EINVAL; > + } > + > + 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, "otg"); > + if (IS_ERR(clk)) { > + dev_err(dev, "Failed to get otg clock\n"); > + return PTR_ERR(clk); > + } > + > + sphy->dev = &pdev->dev; > + sphy->plat = pdata; > + sphy->regs = phy_base; > + sphy->clk = clk; > + sphy->phy.dev = sphy->dev; > + sphy->phy.label = "samsung-usbphy"; > + sphy->phy.init = samsung_usbphy_init; > + sphy->phy.shutdown = samsung_usbphy_shutdown; > + sphy->cpu_type = samsung_usbphy_get_driver_data(pdev); > + sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy); > + > + platform_set_drvdata(pdev, sphy); > + > + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); > + return ret; return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); > +} > + > +static int __exit samsung_usbphy_remove(struct platform_device *pdev) > +{ > + struct samsung_usbphy *sphy = platform_get_drvdata(pdev); > + > + usb_remove_phy(&sphy->phy); > + > + return 0; > +} > + > +#ifdef CONFIG_OF > +static const struct of_device_id samsung_usbphy_dt_match[] = { > + { > + .compatible = "samsung,s3c64xx-usbphy", > + .data = (void *)TYPE_S3C64XX, > + }, { > + .compatible = "samsung,exynos4210-usbphy", > + .data = (void *)TYPE_EXYNOS4210, > + }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match); > +#else > +#define samsung_usbphy_dt_match NULL > +#endif Instead of using else and defining samsung_usbphy_dt_match manually, instead you can use of_match_ptr macro. (See my next comment.) > + > +static struct platform_device_id samsung_usbphy_driver_ids[] = { > + { > + .name = "s3c64xx-usbphy", > + .driver_data = TYPE_S3C64XX, > + }, { > + .name = "exynos4210-usbphy", > + .driver_data = TYPE_EXYNOS4210, > + }, > + {}, > +}; > + > +MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids); > + > +static struct platform_driver samsung_usbphy_driver = { > + .probe = samsung_usbphy_probe, > + .remove = __devexit_p(samsung_usbphy_remove), > + .id_table = samsung_usbphy_driver_ids, > + .driver = { > + .name = "samsung-usbphy", > + .owner = THIS_MODULE, > + .of_match_table = samsung_usbphy_dt_match, .of_match_table = of_match_ptr(samsung_usbphy_dt_match), > + }, > +}; > + > +module_platform_driver(samsung_usbphy_driver); > + > +MODULE_DESCRIPTION("Samsung USB phy controller"); > +MODULE_AUTHOR("Praveen Paneri <p.paneri@xxxxxxxxxxx>"); > +MODULE_LICENSE("GPL"); > +MODULE_ALIAS("platform:samsung-usbphy"); > diff --git a/include/linux/platform_data/samsung-usbphy.h > b/include/linux/platform_data/samsung-usbphy.h new file mode 100644 > index 0000000..1bd24cb > --- /dev/null > +++ b/include/linux/platform_data/samsung-usbphy.h > @@ -0,0 +1,27 @@ > +/* > + * Copyright (C) 2012 Samsung Electronics Co.Ltd > + * http://www.samsung.com/ > + * Author: Praveen Paneri <p.paneri@xxxxxxxxxxx> > + * > + * Defines platform data for samsung usb phy driver. > + * > + * 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. > + */ > + > +#ifndef __SAMSUNG_USBPHY_PLATFORM_H > +#define __SAMSUNG_USBPHY_PLATFORM_H > + > +/** > + * samsung_usbphy_data - Platform data for USB PHY driver. > + * @pmu_isolation: Function to control usb phy isolation in PMU. > + */ > +struct samsung_usbphy_data { > + void (*pmu_isolation)(int on); I believe this should be named in a generic way. This is called PMU isolation on Exynos SoCs, but on S3C64xx it's USB PHY mask. Best regards, Tomasz Figa -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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