usb: phy: samsung: Introducing usb phy driver for hsotg (337dc3a7) · Commits · 戴 / test

Documentation/devicetree/bindings/usb/samsung-usbphy.txt

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		* Samsung's usb phy transceiver

		The Samsung's phy transceiver is used for controlling usb otg phy for
		s3c-hsotg usb device controller.
		TODO: Adding the PHY binding with controller(s) according to the under
		developement generic PHY driver.

		Required properties:
		- compatible : should be "samsung,exynos4210-usbphy"
		- reg : base physical address of the phy registers and length of memory mapped
		region.

drivers/usb/phy/Kconfig

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		@@ -45,3 +45,11 @@ config USB_RCAR_PHY

		To compile this driver as a module, choose M here: the
		module will be called rcar-phy.

		config SAMSUNG_USBPHY
		bool "Samsung USB PHY controller Driver"
		depends on USB_S3C_HSOTG
		select USB_OTG_UTILS
		help
		Enable this to support Samsung USB phy controller for samsung
		SoCs.

drivers/usb/phy/Makefile

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		@@ -9,3 +9,4 @@ obj-$(CONFIG_USB_ISP1301) += isp1301.o
		obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o
		obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o
		obj-$(CONFIG_USB_RCAR_PHY) += rcar-phy.o
		obj-$(CONFIG_SAMSUNG_USBPHY) += samsung-usbphy.o

drivers/usb/phy/samsung-usbphy.c

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		/* 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 SAMSUNG_PHYPWR (0x00)

		#define PHYPWR_NORMAL_MASK (0x19 << 0)
		#define PHYPWR_OTG_DISABLE (0x1 << 4)
		#define PHYPWR_ANALOG_POWERDOWN (0x1 << 3)
		#define PHYPWR_FORCE_SUSPEND (0x1 << 1)
		/* For Exynos4 */
		#define PHYPWR_NORMAL_MASK_PHY0 (0x39 << 0)
		#define PHYPWR_SLEEP_PHY0 (0x1 << 5)

		#define SAMSUNG_PHYCLK (0x04)

		#define PHYCLK_MODE_USB11 (0x1 << 6)
		#define PHYCLK_EXT_OSC (0x1 << 5)
		#define PHYCLK_COMMON_ON_N (0x1 << 4)
		#define PHYCLK_ID_PULL (0x1 << 2)
		#define PHYCLK_CLKSEL_MASK (0x3 << 0)
		#define PHYCLK_CLKSEL_48M (0x0 << 0)
		#define PHYCLK_CLKSEL_12M (0x2 << 0)
		#define PHYCLK_CLKSEL_24M (0x3 << 0)

		#define SAMSUNG_RSTCON (0x08)

		#define RSTCON_PHYLINK_SWRST (0x1 << 2)
		#define RSTCON_HLINK_SWRST (0x1 << 1)
		#define RSTCON_SWRST (0x1 << 0)

		#ifndef MHZ
		#define MHZ (1000*1000)
		#endif

		enum samsung_cpu_type {
		TYPE_S3C64XX,
		TYPE_EXYNOS4210,
		};

		/*
		* struct samsung_usbphy - transceiver driver state
		* @phy: transceiver structure
		* @plat: platform data
		* @dev: The parent device supplied to the probe function
		* @clk: usb phy clock
		* @regs: usb phy register memory base
		* @ref_clk_freq: reference clock frequency selection
		* @cpu_type: machine identifier
		*/
		struct samsung_usbphy {
		struct usb_phy phy;
		struct samsung_usbphy_data *plat;
		struct device *dev;
		struct clk *clk;
		void __iomem *regs;
		int ref_clk_freq;
		int cpu_type;
		};

		#define phy_to_sphy(x) container_of((x), struct samsung_usbphy, phy)

		/*
		* Returns reference clock frequency selection value
		*/
		static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
		{
		struct clk *ref_clk;
		int refclk_freq = 0;

		ref_clk = clk_get(sphy->dev, "xusbxti");
		if (IS_ERR(ref_clk)) {
		dev_err(sphy->dev, "Failed to get reference clock\n");
		return PTR_ERR(ref_clk);
		}

		switch (clk_get_rate(ref_clk)) {
		case 12 * MHZ:
		refclk_freq = PHYCLK_CLKSEL_12M;
		break;
		case 24 * MHZ:
		refclk_freq = PHYCLK_CLKSEL_24M;
		break;
		case 48 * MHZ:
		refclk_freq = PHYCLK_CLKSEL_48M;
		break;
		default:
		if (sphy->cpu_type == TYPE_S3C64XX)
		refclk_freq = PHYCLK_CLKSEL_48M;
		else
		refclk_freq = PHYCLK_CLKSEL_24M;
		break;
		}
		clk_put(ref_clk);

		return refclk_freq;
		}

		static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
		{
		void __iomem *regs = sphy->regs;
		u32 phypwr;
		u32 phyclk;
		u32 rstcon;

		/* set clock frequency for PLL */
		phyclk = sphy->ref_clk_freq;
		phypwr = readl(regs + SAMSUNG_PHYPWR);
		rstcon = readl(regs + SAMSUNG_RSTCON);

		switch (sphy->cpu_type) {
		case TYPE_S3C64XX:
		phyclk &= ~PHYCLK_COMMON_ON_N;
		phypwr &= ~PHYPWR_NORMAL_MASK;
		rstcon \|= RSTCON_SWRST;
		break;
		case TYPE_EXYNOS4210:
		phypwr &= ~PHYPWR_NORMAL_MASK_PHY0;
		rstcon \|= RSTCON_SWRST;
		default:
		break;
		}

		writel(phyclk, regs + SAMSUNG_PHYCLK);
		/* Configure PHY0 for normal operation*/
		writel(phypwr, regs + SAMSUNG_PHYPWR);
		/* reset all ports of PHY and Link */
		writel(rstcon, regs + SAMSUNG_RSTCON);
		udelay(10);
		rstcon &= ~RSTCON_SWRST;
		writel(rstcon, regs + SAMSUNG_RSTCON);
		}

		static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
		{
		void __iomem *regs = sphy->regs;
		u32 phypwr;

		phypwr = readl(regs + SAMSUNG_PHYPWR);

		switch (sphy->cpu_type) {
		case TYPE_S3C64XX:
		phypwr \|= PHYPWR_NORMAL_MASK;
		break;
		case TYPE_EXYNOS4210:
		phypwr \|= PHYPWR_NORMAL_MASK_PHY0;
		default:
		break;
		}

		/* Disable analog and otg block power */
		writel(phypwr, regs + SAMSUNG_PHYPWR);
		}

		/*
		* The function passed to the usb driver for phy initialization
		*/
		static int samsung_usbphy_init(struct usb_phy *phy)
		{
		struct samsung_usbphy *sphy;
		int ret = 0;

		sphy = phy_to_sphy(phy);

		/* Enable the phy clock */
		ret = clk_prepare_enable(sphy->clk);
		if (ret) {
		dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
		return ret;
		}

		/* Disable phy isolation */
		if (sphy->plat && sphy->plat->pmu_isolation)
		sphy->plat->pmu_isolation(false);

		/* Initialize usb phy registers */
		samsung_usbphy_enable(sphy);

		/* Disable the phy clock */
		clk_disable_unprepare(sphy->clk);
		return ret;
		}

		/*
		* The function passed to the usb driver for phy shutdown
		*/
		static void samsung_usbphy_shutdown(struct usb_phy *phy)
		{
		struct samsung_usbphy *sphy;

		sphy = phy_to_sphy(phy);

		if (clk_prepare_enable(sphy->clk)) {
		dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
		return;
		}

		/* De-initialize usb phy registers */
		samsung_usbphy_disable(sphy);

		/* Enable phy isolation */
		if (sphy->plat && sphy->plat->pmu_isolation)
		sphy->plat->pmu_isolation(true);

		clk_disable_unprepare(sphy->clk);
		}

		static const struct of_device_id samsung_usbphy_dt_match[];

		static inline int samsung_usbphy_get_driver_data(struct platform_device *pdev)
		{
		if (pdev->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_node(samsung_usbphy_dt_match,
		pdev->dev.of_node);
		return (int) match->data;
		}

		return platform_get_device_id(pdev)->driver_data;
		}

		static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
		{
		struct samsung_usbphy *sphy;
		struct samsung_usbphy_data *pdata;
		struct device *dev = &pdev->dev;
		struct resource *phy_mem;
		void __iomem *phy_base;
		struct clk *clk;

		pdata = pdev->dev.platform_data;
		if (!pdata) {
		dev_err(&pdev->dev, "%s: no platform data defined\n", __func__);
		return -EINVAL;
		}

		phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!phy_mem) {
		dev_err(dev, "%s: missing mem resource\n", __func__);
		return -ENODEV;
		}

		phy_base = devm_request_and_ioremap(dev, phy_mem);
		if (!phy_base) {
		dev_err(dev, "%s: register mapping failed\n", __func__);
		return -ENXIO;
		}

		sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
		if (!sphy)
		return -ENOMEM;

		clk = devm_clk_get(dev, "otg");
		if (IS_ERR(clk)) {
		dev_err(dev, "Failed to get otg clock\n");
		return PTR_ERR(clk);
		}

		sphy->dev = &pdev->dev;
		sphy->plat = pdata;
		sphy->regs = phy_base;
		sphy->clk = clk;
		sphy->phy.dev = sphy->dev;
		sphy->phy.label = "samsung-usbphy";
		sphy->phy.init = samsung_usbphy_init;
		sphy->phy.shutdown = samsung_usbphy_shutdown;
		sphy->cpu_type = samsung_usbphy_get_driver_data(pdev);
		sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy);

		platform_set_drvdata(pdev, sphy);

		return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
		}

		static int __exit samsung_usbphy_remove(struct platform_device *pdev)
		{
		struct samsung_usbphy *sphy = platform_get_drvdata(pdev);

		usb_remove_phy(&sphy->phy);

		return 0;
		}

		#ifdef CONFIG_OF
		static const struct of_device_id samsung_usbphy_dt_match[] = {
		{
		.compatible = "samsung,s3c64xx-usbphy",
		.data = (void *)TYPE_S3C64XX,
		}, {
		.compatible = "samsung,exynos4210-usbphy",
		.data = (void *)TYPE_EXYNOS4210,
		},
		{},
		};
		MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
		#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 = of_match_ptr(samsung_usbphy_dt_match),
		},
		};

		module_platform_driver(samsung_usbphy_driver);

		MODULE_DESCRIPTION("Samsung USB phy controller");
		MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:samsung-usbphy");

include/linux/platform_data/samsung-usbphy.h

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		/*
		* 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 */

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