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263 lines
6.3 KiB
263 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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{ |
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.compatible = "samsung,exynos5420-usb2-phy", |
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.data = &exynos5420_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 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, struct_size(drv, instances, cfg->num_phys), |
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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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drv->reg_phy = devm_platform_ioremap_resource(pdev, 0); |
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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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.suppress_bind_attrs = true, |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:samsung-usb2-phy");
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