drivers/usb/chipidea/ci_hdrc_msm.c - arm/linux - Git at Google

 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/usb/chipidea.h>
 #include <linux/clk.h>
 #include <linux/reset.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/io.h>
 #include <linux/reset-controller.h>
 #include <linux/extcon.h>
 #include <linux/of.h>

 #include "ci.h"

 #define HS_PHY_AHB_MODE			0x0098

 #define HS_PHY_GENCONFIG		0x009c
 #define HS_PHY_TXFIFO_IDLE_FORCE_DIS	BIT(4)

 #define HS_PHY_GENCONFIG_2		0x00a0
 #define HS_PHY_SESS_VLD_CTRL_EN		BIT(7)
 #define HS_PHY_ULPI_TX_PKT_EN_CLR_FIX	BIT(19)

 #define HSPHY_SESS_VLD_CTRL		BIT(25)

 /* Vendor base starts at 0x200 beyond CI base */
 #define HS_PHY_CTRL			0x0040
 #define HS_PHY_SEC_CTRL			0x0078
 #define HS_PHY_DIG_CLAMP_N		BIT(16)
 #define HS_PHY_POR_ASSERT		BIT(0)

 struct ci_hdrc_msm {
 	struct platform_device *ci;
 	struct clk *core_clk;
 	struct clk *iface_clk;
 	struct clk *fs_clk;
 	struct ci_hdrc_platform_data pdata;
 	struct reset_controller_dev rcdev;
 	bool secondary_phy;
 	bool hsic;
 	void __iomem *base;
 };

 static int
 ci_hdrc_msm_por_reset(struct reset_controller_dev *r, unsigned long id)
 {
 	struct ci_hdrc_msm *ci_msm = container_of(r, struct ci_hdrc_msm, rcdev);
 	void __iomem *addr = ci_msm->base;
 	u32 val;

 	if (id)
 		addr += HS_PHY_SEC_CTRL;
 	else
 		addr += HS_PHY_CTRL;

 	val = readl_relaxed(addr);
 	val |= HS_PHY_POR_ASSERT;
 	writel(val, addr);
 	/*
 	 * wait for minimum 10 microseconds as suggested by manual.
 	 * Use a slightly larger value since the exact value didn't
 	 * work 100% of the time.
 	 */
 	udelay(12);
 	val &= ~HS_PHY_POR_ASSERT;
 	writel(val, addr);

 	return 0;
 }

 static const struct reset_control_ops ci_hdrc_msm_reset_ops = {
 	.reset = ci_hdrc_msm_por_reset,
 };

 static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
 {
 	struct device *dev = ci->dev->parent;
 	struct ci_hdrc_msm *msm_ci = dev_get_drvdata(dev);
 	int ret;

 	switch (event) {
 	case CI_HDRC_CONTROLLER_RESET_EVENT:
 		dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");

 		hw_phymode_configure(ci);
 		if (msm_ci->secondary_phy) {
 			u32 val = readl_relaxed(msm_ci->base + HS_PHY_SEC_CTRL);
 			val |= HS_PHY_DIG_CLAMP_N;
 			writel_relaxed(val, msm_ci->base + HS_PHY_SEC_CTRL);
 		}

 		ret = phy_init(ci->phy);
 		if (ret)
 			return ret;

 		ret = phy_power_on(ci->phy);
 		if (ret) {
 			phy_exit(ci->phy);
 			return ret;
 		}

 		/* use AHB transactor, allow posted data writes */
 		hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);

 		/* workaround for rx buffer collision issue */
 		hw_write_id_reg(ci, HS_PHY_GENCONFIG,
 				HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0);

 		if (!msm_ci->hsic)
 			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 					HS_PHY_ULPI_TX_PKT_EN_CLR_FIX, 0);

 		if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
 			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 					HS_PHY_SESS_VLD_CTRL_EN,
 					HS_PHY_SESS_VLD_CTRL_EN);
 			hw_write(ci, OP_USBCMD, HSPHY_SESS_VLD_CTRL,
 				 HSPHY_SESS_VLD_CTRL);

 		}
 		break;
 	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
 		dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
 		phy_power_off(ci->phy);
 		phy_exit(ci->phy);
 		break;
 	default:
 		dev_dbg(dev, "unknown ci_hdrc event\n");
 		break;
 	}

 	return 0;
 }

 static int ci_hdrc_msm_mux_phy(struct ci_hdrc_msm *ci,
 			       struct platform_device *pdev)
 {
 	struct regmap *regmap;
 	struct device *dev = &pdev->dev;
 	struct of_phandle_args args;
 	u32 val;
 	int ret;

 	ret = of_parse_phandle_with_fixed_args(dev->of_node, "phy-select", 2, 0,
 					       &args);
 	if (ret)
 		return 0;

 	regmap = syscon_node_to_regmap(args.np);
 	of_node_put(args.np);
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);

 	ret = regmap_write(regmap, args.args[0], args.args[1]);
 	if (ret)
 		return ret;

 	ci->secondary_phy = !!args.args[1];
 	if (ci->secondary_phy) {
 		val = readl_relaxed(ci->base + HS_PHY_SEC_CTRL);
 		val |= HS_PHY_DIG_CLAMP_N;
 		writel_relaxed(val, ci->base + HS_PHY_SEC_CTRL);
 	}

 	return 0;
 }

 static int ci_hdrc_msm_probe(struct platform_device *pdev)
 {
 	struct ci_hdrc_msm *ci;
 	struct platform_device *plat_ci;
 	struct clk *clk;
 	struct reset_control *reset;
 	struct resource *res;
 	int ret;
 	struct device_node *ulpi_node, *phy_node;

 	dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");

 	ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
 	if (!ci)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, ci);

 	ci->pdata.name = "ci_hdrc_msm";
 	ci->pdata.capoffset = DEF_CAPOFFSET;
 	ci->pdata.flags	= CI_HDRC_REGS_SHARED | CI_HDRC_DISABLE_STREAMING |
 			  CI_HDRC_OVERRIDE_AHB_BURST |
 			  CI_HDRC_OVERRIDE_PHY_CONTROL;
 	ci->pdata.notify_event = ci_hdrc_msm_notify_event;

 	reset = devm_reset_control_get(&pdev->dev, "core");
 	if (IS_ERR(reset))
 		return PTR_ERR(reset);

 	ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);

 	ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);

 	ci->fs_clk = clk = devm_clk_get(&pdev->dev, "fs");
 	if (IS_ERR(clk)) {
 		if (PTR_ERR(clk) == -EPROBE_DEFER)
 			return -EPROBE_DEFER;
 		ci->fs_clk = NULL;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	ci->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(ci->base))
 		return PTR_ERR(ci->base);

 	ci->rcdev.owner = THIS_MODULE;
 	ci->rcdev.ops = &ci_hdrc_msm_reset_ops;
 	ci->rcdev.of_node = pdev->dev.of_node;
 	ci->rcdev.nr_resets = 2;
 	ret = reset_controller_register(&ci->rcdev);
 	if (ret)
 		return ret;

 	ret = clk_prepare_enable(ci->fs_clk);
 	if (ret)
 		goto err_fs;

 	reset_control_assert(reset);
 	usleep_range(10000, 12000);
 	reset_control_deassert(reset);

 	clk_disable_unprepare(ci->fs_clk);

 	ret = clk_prepare_enable(ci->core_clk);
 	if (ret)
 		goto err_fs;

 	ret = clk_prepare_enable(ci->iface_clk);
 	if (ret)
 		goto err_iface;

 	ret = ci_hdrc_msm_mux_phy(ci, pdev);
 	if (ret)
 		goto err_mux;

 	ulpi_node = of_find_node_by_name(of_node_get(pdev->dev.of_node), "ulpi");
 	if (ulpi_node) {
 		phy_node = of_get_next_available_child(ulpi_node, NULL);
 		ci->hsic = of_device_is_compatible(phy_node, "qcom,usb-hsic-phy");
 		of_node_put(phy_node);
 	}
 	of_node_put(ulpi_node);

 	plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
 				     pdev->num_resources, &ci->pdata);
 	if (IS_ERR(plat_ci)) {
 		ret = PTR_ERR(plat_ci);
 		if (ret != -EPROBE_DEFER)
 			dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
 		goto err_mux;
 	}

 	ci->ci = plat_ci;

 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_no_callbacks(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);

 	return 0;

 err_mux:
 	clk_disable_unprepare(ci->iface_clk);
 err_iface:
 	clk_disable_unprepare(ci->core_clk);
 err_fs:
 	reset_controller_unregister(&ci->rcdev);
 	return ret;
 }

 static int ci_hdrc_msm_remove(struct platform_device *pdev)
 {
 	struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);

 	pm_runtime_disable(&pdev->dev);
 	ci_hdrc_remove_device(ci->ci);
 	clk_disable_unprepare(ci->iface_clk);
 	clk_disable_unprepare(ci->core_clk);
 	reset_controller_unregister(&ci->rcdev);

 	return 0;
 }

 static const struct of_device_id msm_ci_dt_match[] = {
 	{ .compatible = "qcom,ci-hdrc", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, msm_ci_dt_match);

 static struct platform_driver ci_hdrc_msm_driver = {
 	.probe = ci_hdrc_msm_probe,
 	.remove = ci_hdrc_msm_remove,
 	.driver = {
 		.name = "msm_hsusb",
 		.of_match_table = msm_ci_dt_match,
 	},
 };

 module_platform_driver(ci_hdrc_msm_driver);

 MODULE_ALIAS("platform:msm_hsusb");
 MODULE_ALIAS("platform:ci13xxx_msm");
 MODULE_LICENSE("GPL v2");
	/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/usb/chipidea.h>
	#include <linux/clk.h>
	#include <linux/reset.h>
	#include <linux/mfd/syscon.h>
	#include <linux/regmap.h>
	#include <linux/io.h>
	#include <linux/reset-controller.h>
	#include <linux/extcon.h>
	#include <linux/of.h>

	#include "ci.h"

	#define HS_PHY_AHB_MODE 0x0098

	#define HS_PHY_GENCONFIG 0x009c
	#define HS_PHY_TXFIFO_IDLE_FORCE_DIS BIT(4)

	#define HS_PHY_GENCONFIG_2 0x00a0
	#define HS_PHY_SESS_VLD_CTRL_EN BIT(7)
	#define HS_PHY_ULPI_TX_PKT_EN_CLR_FIX BIT(19)

	#define HSPHY_SESS_VLD_CTRL BIT(25)

	/* Vendor base starts at 0x200 beyond CI base */
	#define HS_PHY_CTRL 0x0040
	#define HS_PHY_SEC_CTRL 0x0078
	#define HS_PHY_DIG_CLAMP_N BIT(16)
	#define HS_PHY_POR_ASSERT BIT(0)

	struct ci_hdrc_msm {
	struct platform_device *ci;
	struct clk *core_clk;
	struct clk *iface_clk;
	struct clk *fs_clk;
	struct ci_hdrc_platform_data pdata;
	struct reset_controller_dev rcdev;
	bool secondary_phy;
	bool hsic;
	void __iomem *base;
	};

	static int
	ci_hdrc_msm_por_reset(struct reset_controller_dev *r, unsigned long id)
	{
	struct ci_hdrc_msm *ci_msm = container_of(r, struct ci_hdrc_msm, rcdev);
	void __iomem *addr = ci_msm->base;
	u32 val;

	if (id)
	addr += HS_PHY_SEC_CTRL;
	else
	addr += HS_PHY_CTRL;

	val = readl_relaxed(addr);
	val \|= HS_PHY_POR_ASSERT;
	writel(val, addr);
	/*
	* wait for minimum 10 microseconds as suggested by manual.
	* Use a slightly larger value since the exact value didn't
	* work 100% of the time.
	*/
	udelay(12);
	val &= ~HS_PHY_POR_ASSERT;
	writel(val, addr);

	return 0;
	}

	static const struct reset_control_ops ci_hdrc_msm_reset_ops = {
	.reset = ci_hdrc_msm_por_reset,
	};

	static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
	{
	struct device *dev = ci->dev->parent;
	struct ci_hdrc_msm *msm_ci = dev_get_drvdata(dev);
	int ret;

	switch (event) {
	case CI_HDRC_CONTROLLER_RESET_EVENT:
	dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");

	hw_phymode_configure(ci);
	if (msm_ci->secondary_phy) {
	u32 val = readl_relaxed(msm_ci->base + HS_PHY_SEC_CTRL);
	val \|= HS_PHY_DIG_CLAMP_N;
	writel_relaxed(val, msm_ci->base + HS_PHY_SEC_CTRL);
	}

	ret = phy_init(ci->phy);
	if (ret)
	return ret;

	ret = phy_power_on(ci->phy);
	if (ret) {
	phy_exit(ci->phy);
	return ret;
	}

	/* use AHB transactor, allow posted data writes */
	hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);

	/* workaround for rx buffer collision issue */
	hw_write_id_reg(ci, HS_PHY_GENCONFIG,
	HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0);

	if (!msm_ci->hsic)
	hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
	HS_PHY_ULPI_TX_PKT_EN_CLR_FIX, 0);

	if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
	hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
	HS_PHY_SESS_VLD_CTRL_EN,
	HS_PHY_SESS_VLD_CTRL_EN);
	hw_write(ci, OP_USBCMD, HSPHY_SESS_VLD_CTRL,
	HSPHY_SESS_VLD_CTRL);

	}
	break;
	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
	dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
	phy_power_off(ci->phy);
	phy_exit(ci->phy);
	break;
	default:
	dev_dbg(dev, "unknown ci_hdrc event\n");
	break;
	}

	return 0;
	}

	static int ci_hdrc_msm_mux_phy(struct ci_hdrc_msm *ci,
	struct platform_device *pdev)
	{
	struct regmap *regmap;
	struct device *dev = &pdev->dev;
	struct of_phandle_args args;
	u32 val;
	int ret;

	ret = of_parse_phandle_with_fixed_args(dev->of_node, "phy-select", 2, 0,
	&args);
	if (ret)
	return 0;

	regmap = syscon_node_to_regmap(args.np);
	of_node_put(args.np);
	if (IS_ERR(regmap))
	return PTR_ERR(regmap);

	ret = regmap_write(regmap, args.args[0], args.args[1]);
	if (ret)
	return ret;

	ci->secondary_phy = !!args.args[1];
	if (ci->secondary_phy) {
	val = readl_relaxed(ci->base + HS_PHY_SEC_CTRL);
	val \|= HS_PHY_DIG_CLAMP_N;
	writel_relaxed(val, ci->base + HS_PHY_SEC_CTRL);
	}

	return 0;
	}

	static int ci_hdrc_msm_probe(struct platform_device *pdev)
	{
	struct ci_hdrc_msm *ci;
	struct platform_device *plat_ci;
	struct clk *clk;
	struct reset_control *reset;
	struct resource *res;
	int ret;
	struct device_node ulpi_node, phy_node;

	dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");

	ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
	if (!ci)
	return -ENOMEM;
	platform_set_drvdata(pdev, ci);

	ci->pdata.name = "ci_hdrc_msm";
	ci->pdata.capoffset = DEF_CAPOFFSET;
	ci->pdata.flags = CI_HDRC_REGS_SHARED \| CI_HDRC_DISABLE_STREAMING \|
	CI_HDRC_OVERRIDE_AHB_BURST \|
	CI_HDRC_OVERRIDE_PHY_CONTROL;
	ci->pdata.notify_event = ci_hdrc_msm_notify_event;

	reset = devm_reset_control_get(&pdev->dev, "core");
	if (IS_ERR(reset))
	return PTR_ERR(reset);

	ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
	if (IS_ERR(clk))
	return PTR_ERR(clk);

	ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
	if (IS_ERR(clk))
	return PTR_ERR(clk);

	ci->fs_clk = clk = devm_clk_get(&pdev->dev, "fs");
	if (IS_ERR(clk)) {
	if (PTR_ERR(clk) == -EPROBE_DEFER)
	return -EPROBE_DEFER;
	ci->fs_clk = NULL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	ci->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ci->base))
	return PTR_ERR(ci->base);

	ci->rcdev.owner = THIS_MODULE;
	ci->rcdev.ops = &ci_hdrc_msm_reset_ops;
	ci->rcdev.of_node = pdev->dev.of_node;
	ci->rcdev.nr_resets = 2;
	ret = reset_controller_register(&ci->rcdev);
	if (ret)
	return ret;

	ret = clk_prepare_enable(ci->fs_clk);
	if (ret)
	goto err_fs;

	reset_control_assert(reset);
	usleep_range(10000, 12000);
	reset_control_deassert(reset);

	clk_disable_unprepare(ci->fs_clk);

	ret = clk_prepare_enable(ci->core_clk);
	if (ret)
	goto err_fs;

	ret = clk_prepare_enable(ci->iface_clk);
	if (ret)
	goto err_iface;

	ret = ci_hdrc_msm_mux_phy(ci, pdev);
	if (ret)
	goto err_mux;

	ulpi_node = of_find_node_by_name(of_node_get(pdev->dev.of_node), "ulpi");
	if (ulpi_node) {
	phy_node = of_get_next_available_child(ulpi_node, NULL);
	ci->hsic = of_device_is_compatible(phy_node, "qcom,usb-hsic-phy");
	of_node_put(phy_node);
	}
	of_node_put(ulpi_node);

	plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
	pdev->num_resources, &ci->pdata);
	if (IS_ERR(plat_ci)) {
	ret = PTR_ERR(plat_ci);
	if (ret != -EPROBE_DEFER)
	dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
	goto err_mux;
	}

	ci->ci = plat_ci;

	pm_runtime_set_active(&pdev->dev);
	pm_runtime_no_callbacks(&pdev->dev);
	pm_runtime_enable(&pdev->dev);

	return 0;

	err_mux:
	clk_disable_unprepare(ci->iface_clk);
	err_iface:
	clk_disable_unprepare(ci->core_clk);
	err_fs:
	reset_controller_unregister(&ci->rcdev);
	return ret;
	}

	static int ci_hdrc_msm_remove(struct platform_device *pdev)
	{
	struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);

	pm_runtime_disable(&pdev->dev);
	ci_hdrc_remove_device(ci->ci);
	clk_disable_unprepare(ci->iface_clk);
	clk_disable_unprepare(ci->core_clk);
	reset_controller_unregister(&ci->rcdev);

	return 0;
	}

	static const struct of_device_id msm_ci_dt_match[] = {
	{ .compatible = "qcom,ci-hdrc", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, msm_ci_dt_match);

	static struct platform_driver ci_hdrc_msm_driver = {
	.probe = ci_hdrc_msm_probe,
	.remove = ci_hdrc_msm_remove,
	.driver = {
	.name = "msm_hsusb",
	.of_match_table = msm_ci_dt_match,
	},
	};

	module_platform_driver(ci_hdrc_msm_driver);

	MODULE_ALIAS("platform:msm_hsusb");
	MODULE_ALIAS("platform:ci13xxx_msm");
	MODULE_LICENSE("GPL v2");