| Message ID | 1347886484-16064-2-git-send-email-p.paneri@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Kishon, Felipe, Any further comments on these patches? Can they be merged now? Thanks, Praveen On Mon, Sep 17, 2012 at 6:24 PM, Praveen Paneri <p.paneri@samsung.com> wrote: > This driver uses usb_phy interface to interact with s3c-hsotg. Supports > phy_init and phy_shutdown functions to enable/disable phy. Tested with > smdk6410 and smdkv310. More SoCs can be brought under later. > > Signed-off-by: Praveen Paneri <p.paneri@samsung.com> > Acked-by: Heiko Stuebner <heiko@sntech.de> > --- > .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + > 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, 405 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..fefd9c8 > --- /dev/null > +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > @@ -0,0 +1,9 @@ > +* Samsung's usb phy transceiver > + > +The Samsung's phy transceiver is used for controlling usb otg phy for > +s3c-hsotg usb device controller. > + > +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 63c339b..313685f 100644 > --- a/drivers/usb/phy/Kconfig > +++ b/drivers/usb/phy/Kconfig > @@ -32,3 +32,11 @@ config MV_U3D_PHY > help > Enable this to support Marvell USB 3.0 phy controller for Marvell > SoC. > + > +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 b069f29..55dcfc1 100644 > --- a/drivers/usb/phy/Makefile > +++ b/drivers/usb/phy/Makefile > @@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o > obj-$(CONFIG_USB_ISP1301) += isp1301.o > obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o > obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o > +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..95ec4d0 > --- /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@samsung.com> > + * > + * 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 S3C_PHYPWR (0x00) > + > +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) > +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) > +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) > +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) > +/* For Exynos4 */ > +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) > +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) > + > +#define S3C_PHYCLK (0x04) > + > +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) > +#define S3C_PHYCLK_EXT_OSC (1 << 5) > +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) > +#define S3C_PHYCLK_ID_PULL (1 << 2) > +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) > +#define S3C_PHYCLK_CLKSEL_SHIFT (0) > +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) > +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) > +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) > + > +#define S3C_RSTCON (0x08) > + > +#define S3C_RSTCON_PHYCLK (1 << 2) > +#define S3C_RSTCON_HCLK (1 << 1) > +#define S3C_RSTCON_PHY (1 << 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 |= S3C_PHYCLK_CLKSEL_12M; > + break; > + case 24 * MHZ: > + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; > + break; > + default: > + case 48 * MHZ: > + /* default reference clock */ > + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; > + 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 + S3C_PHYPWR); > + rstcon = readl(regs + S3C_RSTCON); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); > + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; > + rstcon |= S3C_RSTCON_PHY; > + break; > + case TYPE_EXYNOS4210: > + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; > + rstcon |= S3C_RSTCON_PHY; > + default: > + break; > + } > + > + writel(phyclk, regs + S3C_PHYCLK); > + /* set to normal of PHY0 */ > + writel(phypwr, regs + S3C_PHYPWR); > + /* reset all ports of PHY and Link */ > + writel(rstcon, regs + S3C_RSTCON); > + udelay(10); > + rstcon &= ~S3C_RSTCON_PHY; > + writel(rstcon, regs + S3C_RSTCON); > +} > + > +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) > +{ > + void __iomem *regs = sphy->regs; > + u32 phypwr; > + > + phypwr = readl(regs + S3C_PHYPWR); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phypwr |= S3C_PHYPWR_NORMAL_MASK; > + break; > + case TYPE_EXYNOS4210: > + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; > + default: > + break; > + } > + > + /* unset to normal of PHY0 */ > + writel(phypwr, regs + S3C_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) { > + int data; > + 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 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; > + > + 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); > + > + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); > + if (ret) > + goto err; > + > + platform_set_drvdata(pdev, sphy); > +err: > + return ret; > +} > + > +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 > + > +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, > + }, > +}; > + > +module_platform_driver(samsung_usbphy_driver); > + > +MODULE_DESCRIPTION("Samsung USB phy controller"); > +MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>"); > +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@samsung.com> > + * > + * 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); > +}; > + > +extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd); > + > +#endif /* __SAMSUNG_USBPHY_PLATFORM_H */ > -- > 1.7.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi, On Mon, Sep 24, 2012 at 3:08 PM, Praveen Paneri <p.paneri@samsung.com> wrote: > Hi Kishon, Felipe, > > Any further comments on these patches? Can they be merged now? I don't have any other comments. Thanks Kishon
Acked-by: Kyungmin Park <kyungmin.park@samsung.com> On 9/17/12, Praveen Paneri <p.paneri@samsung.com> wrote: > This driver uses usb_phy interface to interact with s3c-hsotg. Supports > phy_init and phy_shutdown functions to enable/disable phy. Tested with > smdk6410 and smdkv310. More SoCs can be brought under later. > > Signed-off-by: Praveen Paneri <p.paneri@samsung.com> > Acked-by: Heiko Stuebner <heiko@sntech.de> > --- > .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + > 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, 405 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..fefd9c8 > --- /dev/null > +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > @@ -0,0 +1,9 @@ > +* Samsung's usb phy transceiver > + > +The Samsung's phy transceiver is used for controlling usb otg phy for > +s3c-hsotg usb device controller. > + > +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 63c339b..313685f 100644 > --- a/drivers/usb/phy/Kconfig > +++ b/drivers/usb/phy/Kconfig > @@ -32,3 +32,11 @@ config MV_U3D_PHY > help > Enable this to support Marvell USB 3.0 phy controller for Marvell > SoC. > + > +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 b069f29..55dcfc1 100644 > --- a/drivers/usb/phy/Makefile > +++ b/drivers/usb/phy/Makefile > @@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o > obj-$(CONFIG_USB_ISP1301) += isp1301.o > obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o > obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o > +obj-$(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..95ec4d0 > --- /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@samsung.com> > + * > + * 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 S3C_PHYPWR (0x00) > + > +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) > +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) > +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) > +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) > +/* For Exynos4 */ > +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) > +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) > + > +#define S3C_PHYCLK (0x04) > + > +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) > +#define S3C_PHYCLK_EXT_OSC (1 << 5) > +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) > +#define S3C_PHYCLK_ID_PULL (1 << 2) > +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) > +#define S3C_PHYCLK_CLKSEL_SHIFT (0) > +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) > +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) > +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) > + > +#define S3C_RSTCON (0x08) > + > +#define S3C_RSTCON_PHYCLK (1 << 2) > +#define S3C_RSTCON_HCLK (1 << 1) > +#define S3C_RSTCON_PHY (1 << 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 |= S3C_PHYCLK_CLKSEL_12M; > + break; > + case 24 * MHZ: > + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; > + break; > + default: > + case 48 * MHZ: > + /* default reference clock */ > + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; > + 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 + S3C_PHYPWR); > + rstcon = readl(regs + S3C_RSTCON); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); > + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; > + rstcon |= S3C_RSTCON_PHY; > + break; > + case TYPE_EXYNOS4210: > + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; > + rstcon |= S3C_RSTCON_PHY; > + default: > + break; > + } > + > + writel(phyclk, regs + S3C_PHYCLK); > + /* set to normal of PHY0 */ > + writel(phypwr, regs + S3C_PHYPWR); > + /* reset all ports of PHY and Link */ > + writel(rstcon, regs + S3C_RSTCON); > + udelay(10); > + rstcon &= ~S3C_RSTCON_PHY; > + writel(rstcon, regs + S3C_RSTCON); > +} > + > +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) > +{ > + void __iomem *regs = sphy->regs; > + u32 phypwr; > + > + phypwr = readl(regs + S3C_PHYPWR); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phypwr |= S3C_PHYPWR_NORMAL_MASK; > + break; > + case TYPE_EXYNOS4210: > + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; > + default: > + break; > + } > + > + /* unset to normal of PHY0 */ > + writel(phypwr, regs + S3C_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) { > + int data; > + 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 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; > + > + 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); > + > + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); > + if (ret) > + goto err; > + > + platform_set_drvdata(pdev, sphy); > +err: > + return ret; > +} > + > +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 > + > +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, > + }, > +}; > + > +module_platform_driver(samsung_usbphy_driver); > + > +MODULE_DESCRIPTION("Samsung USB phy controller"); > +MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>"); > +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@samsung.com> > + * > + * 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); > +}; > + > +extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd); > + > +#endif /* __SAMSUNG_USBPHY_PLATFORM_H */ > -- > 1.7.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" > in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
On 09/17/2012 07:54 AM, Praveen Paneri wrote: > This driver uses usb_phy interface to interact with s3c-hsotg. Supports > phy_init and phy_shutdown functions to enable/disable phy. Tested with > smdk6410 and smdkv310. More SoCs can be brought under later. > > Signed-off-by: Praveen Paneri <p.paneri@samsung.com> > Acked-by: Heiko Stuebner <heiko@sntech.de> > --- > .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + > 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, 405 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..fefd9c8 > --- /dev/null > +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > @@ -0,0 +1,9 @@ > +* Samsung's usb phy transceiver > + > +The Samsung's phy transceiver is used for controlling usb otg phy for > +s3c-hsotg usb device controller. > + > +Required properties: > +- compatible : should be "samsung,exynos4210-usbphy" > +- reg : base physical address of the phy registers and length of memory mapped > + region. What's missing here is describing the connection of phys to host controllers. We've got several people adding usb phy bindings and need to define them in a common way. Rob > diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig > index 63c339b..313685f 100644 > --- a/drivers/usb/phy/Kconfig > +++ b/drivers/usb/phy/Kconfig > @@ -32,3 +32,11 @@ config MV_U3D_PHY > help > Enable this to support Marvell USB 3.0 phy controller for Marvell > SoC. > + > +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 b069f29..55dcfc1 100644 > --- a/drivers/usb/phy/Makefile > +++ b/drivers/usb/phy/Makefile > @@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o > obj-$(CONFIG_USB_ISP1301) += isp1301.o > obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o > obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o > +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..95ec4d0 > --- /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@samsung.com> > + * > + * 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 S3C_PHYPWR (0x00) > + > +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) > +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) > +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) > +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) > +/* For Exynos4 */ > +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) > +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) > + > +#define S3C_PHYCLK (0x04) > + > +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) > +#define S3C_PHYCLK_EXT_OSC (1 << 5) > +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) > +#define S3C_PHYCLK_ID_PULL (1 << 2) > +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) > +#define S3C_PHYCLK_CLKSEL_SHIFT (0) > +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) > +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) > +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) > + > +#define S3C_RSTCON (0x08) > + > +#define S3C_RSTCON_PHYCLK (1 << 2) > +#define S3C_RSTCON_HCLK (1 << 1) > +#define S3C_RSTCON_PHY (1 << 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 |= S3C_PHYCLK_CLKSEL_12M; > + break; > + case 24 * MHZ: > + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; > + break; > + default: > + case 48 * MHZ: > + /* default reference clock */ > + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; > + 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 + S3C_PHYPWR); > + rstcon = readl(regs + S3C_RSTCON); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); > + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; > + rstcon |= S3C_RSTCON_PHY; > + break; > + case TYPE_EXYNOS4210: > + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; > + rstcon |= S3C_RSTCON_PHY; > + default: > + break; > + } > + > + writel(phyclk, regs + S3C_PHYCLK); > + /* set to normal of PHY0 */ > + writel(phypwr, regs + S3C_PHYPWR); > + /* reset all ports of PHY and Link */ > + writel(rstcon, regs + S3C_RSTCON); > + udelay(10); > + rstcon &= ~S3C_RSTCON_PHY; > + writel(rstcon, regs + S3C_RSTCON); > +} > + > +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) > +{ > + void __iomem *regs = sphy->regs; > + u32 phypwr; > + > + phypwr = readl(regs + S3C_PHYPWR); > + > + switch (sphy->cpu_type) { > + case TYPE_S3C64XX: > + phypwr |= S3C_PHYPWR_NORMAL_MASK; > + break; > + case TYPE_EXYNOS4210: > + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; > + default: > + break; > + } > + > + /* unset to normal of PHY0 */ > + writel(phypwr, regs + S3C_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) { > + int data; > + 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 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; > + > + 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); > + > + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); > + if (ret) > + goto err; > + > + platform_set_drvdata(pdev, sphy); > +err: > + return ret; > +} > + > +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 > + > +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, > + }, > +}; > + > +module_platform_driver(samsung_usbphy_driver); > + > +MODULE_DESCRIPTION("Samsung USB phy controller"); > +MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>"); > +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@samsung.com> > + * > + * 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); > +}; > + > +extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd); > + > +#endif /* __SAMSUNG_USBPHY_PLATFORM_H */ >
Hi Rob, On Mon, Sep 24, 2012 at 6:34 PM, Rob Herring <robherring2@gmail.com> wrote: > On 09/17/2012 07:54 AM, Praveen Paneri wrote: >> This driver uses usb_phy interface to interact with s3c-hsotg. Supports >> phy_init and phy_shutdown functions to enable/disable phy. Tested with >> smdk6410 and smdkv310. More SoCs can be brought under later. >> >> Signed-off-by: Praveen Paneri <p.paneri@samsung.com> >> Acked-by: Heiko Stuebner <heiko@sntech.de> >> --- >> .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + >> 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, 405 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..fefd9c8 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt >> @@ -0,0 +1,9 @@ >> +* Samsung's usb phy transceiver >> + >> +The Samsung's phy transceiver is used for controlling usb otg phy for >> +s3c-hsotg usb device controller. >> + >> +Required properties: >> +- compatible : should be "samsung,exynos4210-usbphy" >> +- reg : base physical address of the phy registers and length of memory mapped >> + region. > > What's missing here is describing the connection of phys to host > controllers. We've got several people adding usb phy bindings and need > to define them in a common way. yes! it just covers the generic binding. I will update it accordingly as the generic phy framework takes its final shape. Praveen > > Rob > >> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig >> index 63c339b..313685f 100644 >> --- a/drivers/usb/phy/Kconfig >> +++ b/drivers/usb/phy/Kconfig >> @@ -32,3 +32,11 @@ config MV_U3D_PHY >> help >> Enable this to support Marvell USB 3.0 phy controller for Marvell >> SoC. >> + >> +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 b069f29..55dcfc1 100644 >> --- a/drivers/usb/phy/Makefile >> +++ b/drivers/usb/phy/Makefile >> @@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o >> obj-$(CONFIG_USB_ISP1301) += isp1301.o >> obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o >> obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o >> +obj-$(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..95ec4d0 >> --- /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@samsung.com> >> + * >> + * 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 S3C_PHYPWR (0x00) >> + >> +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) >> +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) >> +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) >> +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) >> +/* For Exynos4 */ >> +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) >> +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) >> + >> +#define S3C_PHYCLK (0x04) >> + >> +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) >> +#define S3C_PHYCLK_EXT_OSC (1 << 5) >> +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) >> +#define S3C_PHYCLK_ID_PULL (1 << 2) >> +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) >> +#define S3C_PHYCLK_CLKSEL_SHIFT (0) >> +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) >> +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) >> +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) >> + >> +#define S3C_RSTCON (0x08) >> + >> +#define S3C_RSTCON_PHYCLK (1 << 2) >> +#define S3C_RSTCON_HCLK (1 << 1) >> +#define S3C_RSTCON_PHY (1 << 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 |= S3C_PHYCLK_CLKSEL_12M; >> + break; >> + case 24 * MHZ: >> + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; >> + break; >> + default: >> + case 48 * MHZ: >> + /* default reference clock */ >> + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; >> + 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 + S3C_PHYPWR); >> + rstcon = readl(regs + S3C_RSTCON); >> + >> + switch (sphy->cpu_type) { >> + case TYPE_S3C64XX: >> + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); >> + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; >> + rstcon |= S3C_RSTCON_PHY; >> + break; >> + case TYPE_EXYNOS4210: >> + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; >> + rstcon |= S3C_RSTCON_PHY; >> + default: >> + break; >> + } >> + >> + writel(phyclk, regs + S3C_PHYCLK); >> + /* set to normal of PHY0 */ >> + writel(phypwr, regs + S3C_PHYPWR); >> + /* reset all ports of PHY and Link */ >> + writel(rstcon, regs + S3C_RSTCON); >> + udelay(10); >> + rstcon &= ~S3C_RSTCON_PHY; >> + writel(rstcon, regs + S3C_RSTCON); >> +} >> + >> +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) >> +{ >> + void __iomem *regs = sphy->regs; >> + u32 phypwr; >> + >> + phypwr = readl(regs + S3C_PHYPWR); >> + >> + switch (sphy->cpu_type) { >> + case TYPE_S3C64XX: >> + phypwr |= S3C_PHYPWR_NORMAL_MASK; >> + break; >> + case TYPE_EXYNOS4210: >> + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; >> + default: >> + break; >> + } >> + >> + /* unset to normal of PHY0 */ >> + writel(phypwr, regs + S3C_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) { >> + int data; >> + 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 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; >> + >> + 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); >> + >> + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); >> + if (ret) >> + goto err; >> + >> + platform_set_drvdata(pdev, sphy); >> +err: >> + return ret; >> +} >> + >> +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 >> + >> +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, >> + }, >> +}; >> + >> +module_platform_driver(samsung_usbphy_driver); >> + >> +MODULE_DESCRIPTION("Samsung USB phy controller"); >> +MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>"); >> +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@samsung.com> >> + * >> + * 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); >> +}; >> + >> +extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd); >> + >> +#endif /* __SAMSUNG_USBPHY_PLATFORM_H */ >> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
On 09/24/2012 11:38 AM, Praveen Paneri wrote: > Hi Kishon, Felipe, > > Any further comments on these patches? Can they be merged now? One nitpick inline. Marc > > Thanks, > Praveen > > On Mon, Sep 17, 2012 at 6:24 PM, Praveen Paneri <p.paneri@samsung.com> wrote: >> This driver uses usb_phy interface to interact with s3c-hsotg. Supports >> phy_init and phy_shutdown functions to enable/disable phy. Tested with >> smdk6410 and smdkv310. More SoCs can be brought under later. >> >> Signed-off-by: Praveen Paneri <p.paneri@samsung.com> >> Acked-by: Heiko Stuebner <heiko@sntech.de> >> --- >> .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + >> 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, 405 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..fefd9c8 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt >> @@ -0,0 +1,9 @@ >> +* Samsung's usb phy transceiver >> + >> +The Samsung's phy transceiver is used for controlling usb otg phy for >> +s3c-hsotg usb device controller. >> + >> +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 63c339b..313685f 100644 >> --- a/drivers/usb/phy/Kconfig >> +++ b/drivers/usb/phy/Kconfig >> @@ -32,3 +32,11 @@ config MV_U3D_PHY >> help >> Enable this to support Marvell USB 3.0 phy controller for Marvell >> SoC. >> + >> +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 b069f29..55dcfc1 100644 >> --- a/drivers/usb/phy/Makefile >> +++ b/drivers/usb/phy/Makefile >> @@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o >> obj-$(CONFIG_USB_ISP1301) += isp1301.o >> obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o >> obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o >> +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..95ec4d0 >> --- /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@samsung.com> >> + * >> + * 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 S3C_PHYPWR (0x00) >> + >> +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) >> +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) >> +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) >> +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) >> +/* For Exynos4 */ >> +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) >> +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) >> + >> +#define S3C_PHYCLK (0x04) >> + >> +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) >> +#define S3C_PHYCLK_EXT_OSC (1 << 5) >> +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) >> +#define S3C_PHYCLK_ID_PULL (1 << 2) >> +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) >> +#define S3C_PHYCLK_CLKSEL_SHIFT (0) >> +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) >> +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) >> +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) >> + >> +#define S3C_RSTCON (0x08) >> + >> +#define S3C_RSTCON_PHYCLK (1 << 2) >> +#define S3C_RSTCON_HCLK (1 << 1) >> +#define S3C_RSTCON_PHY (1 << 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 |= S3C_PHYCLK_CLKSEL_12M; >> + break; >> + case 24 * MHZ: >> + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; >> + break; >> + default: >> + case 48 * MHZ: >> + /* default reference clock */ >> + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; >> + 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 + S3C_PHYPWR); >> + rstcon = readl(regs + S3C_RSTCON); >> + >> + switch (sphy->cpu_type) { >> + case TYPE_S3C64XX: >> + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); >> + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; >> + rstcon |= S3C_RSTCON_PHY; >> + break; >> + case TYPE_EXYNOS4210: >> + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; >> + rstcon |= S3C_RSTCON_PHY; >> + default: >> + break; >> + } >> + >> + writel(phyclk, regs + S3C_PHYCLK); >> + /* set to normal of PHY0 */ >> + writel(phypwr, regs + S3C_PHYPWR); >> + /* reset all ports of PHY and Link */ >> + writel(rstcon, regs + S3C_RSTCON); >> + udelay(10); >> + rstcon &= ~S3C_RSTCON_PHY; >> + writel(rstcon, regs + S3C_RSTCON); >> +} >> + >> +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) >> +{ >> + void __iomem *regs = sphy->regs; >> + u32 phypwr; >> + >> + phypwr = readl(regs + S3C_PHYPWR); >> + >> + switch (sphy->cpu_type) { >> + case TYPE_S3C64XX: >> + phypwr |= S3C_PHYPWR_NORMAL_MASK; >> + break; >> + case TYPE_EXYNOS4210: >> + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; >> + default: >> + break; >> + } >> + >> + /* unset to normal of PHY0 */ >> + writel(phypwr, regs + S3C_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) { >> + int data; >> + 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 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; >> + >> + 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); >> + >> + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); >> + if (ret) >> + goto err; >> + >> + platform_set_drvdata(pdev, sphy); To avoid potential race conditions, you should first setup platform_set_drvdata(), then add the phy. >> +err: >> + return ret; >> +} >> + >> +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 >> + >> +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, >> + }, >> +}; >> + >> +module_platform_driver(samsung_usbphy_driver); >> + >> +MODULE_DESCRIPTION("Samsung USB phy controller"); >> +MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>"); >> +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@samsung.com> >> + * >> + * 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); >> +}; >> + >> +extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd); >> + >> +#endif /* __SAMSUNG_USBPHY_PLATFORM_H */ >> -- >> 1.7.1 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
On 09/25/2012 06:23 AM, Praveen Paneri wrote: > Hi Rob, > > On Mon, Sep 24, 2012 at 6:34 PM, Rob Herring <robherring2@gmail.com> wrote: >> On 09/17/2012 07:54 AM, Praveen Paneri wrote: >>> This driver uses usb_phy interface to interact with s3c-hsotg. Supports >>> phy_init and phy_shutdown functions to enable/disable phy. Tested with >>> smdk6410 and smdkv310. More SoCs can be brought under later. >>> >>> Signed-off-by: Praveen Paneri <p.paneri@samsung.com> >>> Acked-by: Heiko Stuebner <heiko@sntech.de> >>> --- >>> .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + >>> 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, 405 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..fefd9c8 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt >>> @@ -0,0 +1,9 @@ >>> +* Samsung's usb phy transceiver >>> + >>> +The Samsung's phy transceiver is used for controlling usb otg phy for >>> +s3c-hsotg usb device controller. >>> + >>> +Required properties: >>> +- compatible : should be "samsung,exynos4210-usbphy" >>> +- reg : base physical address of the phy registers and length of memory mapped >>> + region. >> >> What's missing here is describing the connection of phys to host >> controllers. We've got several people adding usb phy bindings and need >> to define them in a common way. > yes! it just covers the generic binding. I will update it accordingly > as the generic phy framework takes its final shape. That sounds like the wrong way to define a binding... Figuring out how to describe the h/w should not be dependent on changes in the kernel. Bindings are an ABI and should not be evolving. Rob
Hi, On Tue, Sep 25, 2012 at 5:48 PM, Rob Herring <robherring2@gmail.com> wrote: > On 09/25/2012 06:23 AM, Praveen Paneri wrote: >> Hi Rob, >> >> On Mon, Sep 24, 2012 at 6:34 PM, Rob Herring <robherring2@gmail.com> wrote: >>> On 09/17/2012 07:54 AM, Praveen Paneri wrote: >>>> This driver uses usb_phy interface to interact with s3c-hsotg. Supports >>>> phy_init and phy_shutdown functions to enable/disable phy. Tested with >>>> smdk6410 and smdkv310. More SoCs can be brought under later. >>>> >>>> Signed-off-by: Praveen Paneri <p.paneri@samsung.com> >>>> Acked-by: Heiko Stuebner <heiko@sntech.de> >>>> --- >>>> .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + >>>> 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, 405 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..fefd9c8 >>>> --- /dev/null >>>> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt >>>> @@ -0,0 +1,9 @@ >>>> +* Samsung's usb phy transceiver >>>> + >>>> +The Samsung's phy transceiver is used for controlling usb otg phy for >>>> +s3c-hsotg usb device controller. >>>> + >>>> +Required properties: >>>> +- compatible : should be "samsung,exynos4210-usbphy" >>>> +- reg : base physical address of the phy registers and length of memory mapped >>>> + region. >>> >>> What's missing here is describing the connection of phys to host >>> controllers. We've got several people adding usb phy bindings and need >>> to define them in a common way. >> yes! it just covers the generic binding. I will update it accordingly >> as the generic phy framework takes its final shape. > > That sounds like the wrong way to define a binding... Figuring out how > to describe the h/w should not be dependent on changes in the kernel. > Bindings are an ABI and should not be evolving. There can be multiple ways to define the binding. For e.g. We discussed few ways of binding the phys to the controller controller { phy0 = <&phandle1_name>; phy1 = <&phandle2_name>; } phy0 and phy1 are any name given to obtain a reference to the phy and the controller should send the phandle name like get_phy_by_phandle("phy0");. Then we thought of standardizing that name. and then finally we settled on something like this controller { phy = <&phandle0_name>, <&phandle1_name>; } so that controller can obtain a reference to the PHY using *of_phy_get(struct device *dev, const char *phandle, u8 index)* Thanks Kishon
Hi, On Tue, Sep 25, 2012 at 6:47 PM, ABRAHAM, KISHON VIJAY <kishon@ti.com> wrote: > Hi, > > On Tue, Sep 25, 2012 at 5:48 PM, Rob Herring <robherring2@gmail.com> wrote: >> On 09/25/2012 06:23 AM, Praveen Paneri wrote: >>> Hi Rob, >>> >>> On Mon, Sep 24, 2012 at 6:34 PM, Rob Herring <robherring2@gmail.com> wrote: >>>> On 09/17/2012 07:54 AM, Praveen Paneri wrote: >>>>> This driver uses usb_phy interface to interact with s3c-hsotg. Supports >>>>> phy_init and phy_shutdown functions to enable/disable phy. Tested with >>>>> smdk6410 and smdkv310. More SoCs can be brought under later. >>>>> >>>>> Signed-off-by: Praveen Paneri <p.paneri@samsung.com> >>>>> Acked-by: Heiko Stuebner <heiko@sntech.de> >>>>> --- >>>>> .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + >>>>> 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, 405 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..fefd9c8 >>>>> --- /dev/null >>>>> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt >>>>> @@ -0,0 +1,9 @@ >>>>> +* Samsung's usb phy transceiver >>>>> + >>>>> +The Samsung's phy transceiver is used for controlling usb otg phy for >>>>> +s3c-hsotg usb device controller. >>>>> + >>>>> +Required properties: >>>>> +- compatible : should be "samsung,exynos4210-usbphy" >>>>> +- reg : base physical address of the phy registers and length of memory mapped >>>>> + region. >>>> >>>> What's missing here is describing the connection of phys to host >>>> controllers. We've got several people adding usb phy bindings and need >>>> to define them in a common way. >>> yes! it just covers the generic binding. I will update it accordingly >>> as the generic phy framework takes its final shape. >> >> That sounds like the wrong way to define a binding... Figuring out how >> to describe the h/w should not be dependent on changes in the kernel. >> Bindings are an ABI and should not be evolving. But since Kishon is getting the generic bindings ready, I can use them when those are ready. So do we need to hold the merge of this patch until then? Thanks, Praveen > > There can be multiple ways to define the binding. For e.g. We > discussed few ways of binding the phys to the controller > > controller { > phy0 = <&phandle1_name>; > phy1 = <&phandle2_name>; > } > > phy0 and phy1 are any name given to obtain a reference to the phy and > the controller should send the phandle name like > get_phy_by_phandle("phy0");. Then we thought of standardizing that > name. > > and then finally we settled on something like this > controller { > phy = <&phandle0_name>, <&phandle1_name>; > } > so that controller can obtain a reference to the PHY using > *of_phy_get(struct device *dev, const char *phandle, u8 index)* > > Thanks > Kishon > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Sep 25, 2012 at 4:59 PM, Marc Kleine-Budde <mkl@pengutronix.de> wrote: > On 09/24/2012 11:38 AM, Praveen Paneri wrote: >> Hi Kishon, Felipe, >> >> Any further comments on these patches? Can they be merged now? > > One nitpick inline. > > Marc >> >> Thanks, >> Praveen >> >> On Mon, Sep 17, 2012 at 6:24 PM, Praveen Paneri <p.paneri@samsung.com> wrote: >>> This driver uses usb_phy interface to interact with s3c-hsotg. Supports >>> phy_init and phy_shutdown functions to enable/disable phy. Tested with >>> smdk6410 and smdkv310. More SoCs can be brought under later. >>> >>> Signed-off-by: Praveen Paneri <p.paneri@samsung.com> >>> Acked-by: Heiko Stuebner <heiko@sntech.de> >>> --- >>> .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + >>> 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, 405 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..fefd9c8 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt >>> @@ -0,0 +1,9 @@ >>> +* Samsung's usb phy transceiver >>> + >>> +The Samsung's phy transceiver is used for controlling usb otg phy for >>> +s3c-hsotg usb device controller. >>> + >>> +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 63c339b..313685f 100644 >>> --- a/drivers/usb/phy/Kconfig >>> +++ b/drivers/usb/phy/Kconfig >>> @@ -32,3 +32,11 @@ config MV_U3D_PHY >>> help >>> Enable this to support Marvell USB 3.0 phy controller for Marvell >>> SoC. >>> + >>> +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 b069f29..55dcfc1 100644 >>> --- a/drivers/usb/phy/Makefile >>> +++ b/drivers/usb/phy/Makefile >>> @@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o >>> obj-$(CONFIG_USB_ISP1301) += isp1301.o >>> obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o >>> obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o >>> +obj-$(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..95ec4d0 >>> --- /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@samsung.com> >>> + * >>> + * 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 S3C_PHYPWR (0x00) >>> + >>> +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) >>> +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) >>> +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) >>> +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) >>> +/* For Exynos4 */ >>> +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) >>> +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) >>> + >>> +#define S3C_PHYCLK (0x04) >>> + >>> +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) >>> +#define S3C_PHYCLK_EXT_OSC (1 << 5) >>> +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) >>> +#define S3C_PHYCLK_ID_PULL (1 << 2) >>> +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) >>> +#define S3C_PHYCLK_CLKSEL_SHIFT (0) >>> +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) >>> +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) >>> +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) >>> + >>> +#define S3C_RSTCON (0x08) >>> + >>> +#define S3C_RSTCON_PHYCLK (1 << 2) >>> +#define S3C_RSTCON_HCLK (1 << 1) >>> +#define S3C_RSTCON_PHY (1 << 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 |= S3C_PHYCLK_CLKSEL_12M; >>> + break; >>> + case 24 * MHZ: >>> + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; >>> + break; >>> + default: >>> + case 48 * MHZ: >>> + /* default reference clock */ >>> + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; >>> + 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 + S3C_PHYPWR); >>> + rstcon = readl(regs + S3C_RSTCON); >>> + >>> + switch (sphy->cpu_type) { >>> + case TYPE_S3C64XX: >>> + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); >>> + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; >>> + rstcon |= S3C_RSTCON_PHY; >>> + break; >>> + case TYPE_EXYNOS4210: >>> + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; >>> + rstcon |= S3C_RSTCON_PHY; >>> + default: >>> + break; >>> + } >>> + >>> + writel(phyclk, regs + S3C_PHYCLK); >>> + /* set to normal of PHY0 */ >>> + writel(phypwr, regs + S3C_PHYPWR); >>> + /* reset all ports of PHY and Link */ >>> + writel(rstcon, regs + S3C_RSTCON); >>> + udelay(10); >>> + rstcon &= ~S3C_RSTCON_PHY; >>> + writel(rstcon, regs + S3C_RSTCON); >>> +} >>> + >>> +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) >>> +{ >>> + void __iomem *regs = sphy->regs; >>> + u32 phypwr; >>> + >>> + phypwr = readl(regs + S3C_PHYPWR); >>> + >>> + switch (sphy->cpu_type) { >>> + case TYPE_S3C64XX: >>> + phypwr |= S3C_PHYPWR_NORMAL_MASK; >>> + break; >>> + case TYPE_EXYNOS4210: >>> + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; >>> + default: >>> + break; >>> + } >>> + >>> + /* unset to normal of PHY0 */ >>> + writel(phypwr, regs + S3C_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) { >>> + int data; >>> + 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 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; >>> + >>> + 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); >>> + >>> + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); >>> + if (ret) >>> + goto err; >>> + >>> + platform_set_drvdata(pdev, sphy); > > To avoid potential race conditions, you should first setup > platform_set_drvdata(), then add the phy. It will not be the case as driver_data is not used as of now, may be I can just remove the platform_set_drvdata() call from here. > >>> +err: >>> + return ret; >>> +} >>> + >>> +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 >>> + >>> +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, >>> + }, >>> +}; >>> + >>> +module_platform_driver(samsung_usbphy_driver); >>> + >>> +MODULE_DESCRIPTION("Samsung USB phy controller"); >>> +MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>"); >>> +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@samsung.com> >>> + * >>> + * 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); >>> +}; >>> + >>> +extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd); >>> + >>> +#endif /* __SAMSUNG_USBPHY_PLATFORM_H */ >>> -- >>> 1.7.1 >>> >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in >>> the body of a message to majordomo@vger.kernel.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-usb" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > > -- > Pengutronix e.K. | Marc Kleine-Budde | > Industrial Linux Solutions | Phone: +49-231-2826-924 | > Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | > Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de | >
diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt new file mode 100644 index 0000000..fefd9c8 --- /dev/null +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt @@ -0,0 +1,9 @@ +* Samsung's usb phy transceiver + +The Samsung's phy transceiver is used for controlling usb otg phy for +s3c-hsotg usb device controller. + +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 63c339b..313685f 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -32,3 +32,11 @@ config MV_U3D_PHY help Enable this to support Marvell USB 3.0 phy controller for Marvell SoC. + +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 b069f29..55dcfc1 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_OMAP_USB2) += omap-usb2.o obj-$(CONFIG_USB_ISP1301) += isp1301.o obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o +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..95ec4d0 --- /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@samsung.com> + * + * 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 S3C_PHYPWR (0x00) + +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) +/* For Exynos4 */ +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) + +#define S3C_PHYCLK (0x04) + +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) +#define S3C_PHYCLK_EXT_OSC (1 << 5) +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) +#define S3C_PHYCLK_ID_PULL (1 << 2) +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) +#define S3C_PHYCLK_CLKSEL_SHIFT (0) +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) + +#define S3C_RSTCON (0x08) + +#define S3C_RSTCON_PHYCLK (1 << 2) +#define S3C_RSTCON_HCLK (1 << 1) +#define S3C_RSTCON_PHY (1 << 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 |= S3C_PHYCLK_CLKSEL_12M; + break; + case 24 * MHZ: + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; + break; + default: + case 48 * MHZ: + /* default reference clock */ + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; + 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 + S3C_PHYPWR); + rstcon = readl(regs + S3C_RSTCON); + + switch (sphy->cpu_type) { + case TYPE_S3C64XX: + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; + rstcon |= S3C_RSTCON_PHY; + break; + case TYPE_EXYNOS4210: + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; + rstcon |= S3C_RSTCON_PHY; + default: + break; + } + + writel(phyclk, regs + S3C_PHYCLK); + /* set to normal of PHY0 */ + writel(phypwr, regs + S3C_PHYPWR); + /* reset all ports of PHY and Link */ + writel(rstcon, regs + S3C_RSTCON); + udelay(10); + rstcon &= ~S3C_RSTCON_PHY; + writel(rstcon, regs + S3C_RSTCON); +} + +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) +{ + void __iomem *regs = sphy->regs; + u32 phypwr; + + phypwr = readl(regs + S3C_PHYPWR); + + switch (sphy->cpu_type) { + case TYPE_S3C64XX: + phypwr |= S3C_PHYPWR_NORMAL_MASK; + break; + case TYPE_EXYNOS4210: + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; + default: + break; + } + + /* unset to normal of PHY0 */ + writel(phypwr, regs + S3C_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) { + int data; + 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 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; + + 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); + + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); + if (ret) + goto err; + + platform_set_drvdata(pdev, sphy); +err: + return ret; +} + +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 + +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, + }, +}; + +module_platform_driver(samsung_usbphy_driver); + +MODULE_DESCRIPTION("Samsung USB phy controller"); +MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>"); +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@samsung.com> + * + * 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); +}; + +extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd); + +#endif /* __SAMSUNG_USBPHY_PLATFORM_H */