![Chunfeng Yun](/assets/img/avatar_default.png)
reduce the boilerplate code to get the specific data Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
265 lines
6.4 KiB
C
265 lines
6.4 KiB
C
/*
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* Samsung SoC USB 1.1/2.0 PHY driver
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*
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* Copyright (C) 2013 Samsung Electronics Co., Ltd.
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* Author: Kamil Debski <k.debski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include "phy-samsung-usb2.h"
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static int samsung_usb2_phy_power_on(struct phy *phy)
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{
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struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
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struct samsung_usb2_phy_driver *drv = inst->drv;
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int ret;
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dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
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inst->cfg->label);
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if (drv->vbus) {
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ret = regulator_enable(drv->vbus);
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if (ret)
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goto err_regulator;
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}
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ret = clk_prepare_enable(drv->clk);
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if (ret)
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goto err_main_clk;
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ret = clk_prepare_enable(drv->ref_clk);
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if (ret)
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goto err_instance_clk;
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if (inst->cfg->power_on) {
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spin_lock(&drv->lock);
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ret = inst->cfg->power_on(inst);
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spin_unlock(&drv->lock);
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if (ret)
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goto err_power_on;
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}
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return 0;
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err_power_on:
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clk_disable_unprepare(drv->ref_clk);
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err_instance_clk:
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clk_disable_unprepare(drv->clk);
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err_main_clk:
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if (drv->vbus)
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regulator_disable(drv->vbus);
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err_regulator:
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return ret;
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}
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static int samsung_usb2_phy_power_off(struct phy *phy)
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{
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struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
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struct samsung_usb2_phy_driver *drv = inst->drv;
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int ret = 0;
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dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
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inst->cfg->label);
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if (inst->cfg->power_off) {
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spin_lock(&drv->lock);
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ret = inst->cfg->power_off(inst);
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spin_unlock(&drv->lock);
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if (ret)
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return ret;
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}
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clk_disable_unprepare(drv->ref_clk);
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clk_disable_unprepare(drv->clk);
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if (drv->vbus)
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ret = regulator_disable(drv->vbus);
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return ret;
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}
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static const struct phy_ops samsung_usb2_phy_ops = {
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.power_on = samsung_usb2_phy_power_on,
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.power_off = samsung_usb2_phy_power_off,
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.owner = THIS_MODULE,
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};
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static struct phy *samsung_usb2_phy_xlate(struct device *dev,
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struct of_phandle_args *args)
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{
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struct samsung_usb2_phy_driver *drv;
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drv = dev_get_drvdata(dev);
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if (!drv)
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return ERR_PTR(-EINVAL);
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if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
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return ERR_PTR(-ENODEV);
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return drv->instances[args->args[0]].phy;
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}
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static const struct of_device_id samsung_usb2_phy_of_match[] = {
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#ifdef CONFIG_PHY_EXYNOS4X12_USB2
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{
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.compatible = "samsung,exynos3250-usb2-phy",
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.data = &exynos3250_usb2_phy_config,
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},
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#endif
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#ifdef CONFIG_PHY_EXYNOS4210_USB2
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{
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.compatible = "samsung,exynos4210-usb2-phy",
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.data = &exynos4210_usb2_phy_config,
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},
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#endif
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#ifdef CONFIG_PHY_EXYNOS4X12_USB2
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{
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.compatible = "samsung,exynos4x12-usb2-phy",
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.data = &exynos4x12_usb2_phy_config,
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},
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#endif
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#ifdef CONFIG_PHY_EXYNOS5250_USB2
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{
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.compatible = "samsung,exynos5250-usb2-phy",
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.data = &exynos5250_usb2_phy_config,
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},
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#endif
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#ifdef CONFIG_PHY_S5PV210_USB2
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{
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.compatible = "samsung,s5pv210-usb2-phy",
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.data = &s5pv210_usb2_phy_config,
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},
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#endif
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{ },
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};
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MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);
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static int samsung_usb2_phy_probe(struct platform_device *pdev)
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{
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const struct samsung_usb2_phy_config *cfg;
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struct device *dev = &pdev->dev;
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struct phy_provider *phy_provider;
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struct resource *mem;
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struct samsung_usb2_phy_driver *drv;
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int i, ret;
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if (!pdev->dev.of_node) {
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dev_err(dev, "This driver is required to be instantiated from device tree\n");
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return -EINVAL;
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}
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cfg = of_device_get_match_data(dev);
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if (!cfg)
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return -EINVAL;
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drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
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cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
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GFP_KERNEL);
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if (!drv)
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return -ENOMEM;
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dev_set_drvdata(dev, drv);
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spin_lock_init(&drv->lock);
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drv->cfg = cfg;
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drv->dev = dev;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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drv->reg_phy = devm_ioremap_resource(dev, mem);
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if (IS_ERR(drv->reg_phy)) {
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dev_err(dev, "Failed to map register memory (phy)\n");
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return PTR_ERR(drv->reg_phy);
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}
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drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
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"samsung,pmureg-phandle");
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if (IS_ERR(drv->reg_pmu)) {
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dev_err(dev, "Failed to map PMU registers (via syscon)\n");
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return PTR_ERR(drv->reg_pmu);
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}
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if (drv->cfg->has_mode_switch) {
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drv->reg_sys = syscon_regmap_lookup_by_phandle(
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pdev->dev.of_node, "samsung,sysreg-phandle");
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if (IS_ERR(drv->reg_sys)) {
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dev_err(dev, "Failed to map system registers (via syscon)\n");
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return PTR_ERR(drv->reg_sys);
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}
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}
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drv->clk = devm_clk_get(dev, "phy");
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if (IS_ERR(drv->clk)) {
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dev_err(dev, "Failed to get clock of phy controller\n");
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return PTR_ERR(drv->clk);
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}
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drv->ref_clk = devm_clk_get(dev, "ref");
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if (IS_ERR(drv->ref_clk)) {
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dev_err(dev, "Failed to get reference clock for the phy controller\n");
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return PTR_ERR(drv->ref_clk);
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}
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drv->ref_rate = clk_get_rate(drv->ref_clk);
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if (drv->cfg->rate_to_clk) {
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ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
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if (ret)
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return ret;
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}
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drv->vbus = devm_regulator_get(dev, "vbus");
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if (IS_ERR(drv->vbus)) {
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ret = PTR_ERR(drv->vbus);
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if (ret == -EPROBE_DEFER)
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return ret;
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drv->vbus = NULL;
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}
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for (i = 0; i < drv->cfg->num_phys; i++) {
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char *label = drv->cfg->phys[i].label;
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struct samsung_usb2_phy_instance *p = &drv->instances[i];
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dev_dbg(dev, "Creating phy \"%s\"\n", label);
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p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops);
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if (IS_ERR(p->phy)) {
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dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
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label);
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return PTR_ERR(p->phy);
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}
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p->cfg = &drv->cfg->phys[i];
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p->drv = drv;
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phy_set_bus_width(p->phy, 8);
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phy_set_drvdata(p->phy, p);
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}
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phy_provider = devm_of_phy_provider_register(dev,
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samsung_usb2_phy_xlate);
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if (IS_ERR(phy_provider)) {
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dev_err(drv->dev, "Failed to register phy provider\n");
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return PTR_ERR(phy_provider);
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}
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return 0;
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}
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static struct platform_driver samsung_usb2_phy_driver = {
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.probe = samsung_usb2_phy_probe,
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.driver = {
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.of_match_table = samsung_usb2_phy_of_match,
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.name = "samsung-usb2-phy",
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}
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};
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module_platform_driver(samsung_usb2_phy_driver);
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MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
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MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:samsung-usb2-phy");
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