[PATCH v6 1/5] usb: phy: samsung: Introducing usb phy driver for hsotg
From: Praveen Paneri <hidden>
Date: 2012-09-25 11:23:47
Also in:
linux-devicetree, linux-samsung-soc
Hi Rob, On Mon, Sep 24, 2012 at 6:34 PM, Rob Herring [off-list ref] wrote:
On 09/17/2012 07:54 AM, Praveen Paneri wrote:quoted
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 <redacted> 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.hdiff --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
Robquoted
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.odiff --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 at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html