/* * Samsung SoC USB 1.1/2.0 PHY driver * * Copyright (C) 2013 Samsung Electronics Co., Ltd. * Author: Kamil Debski * * 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. */ #include #include #include #include #include #include #include #include #include "phy-samsung-usb2.h" static int samsung_usb2_phy_power_on(struct phy *phy) { struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy); struct samsung_usb2_phy_driver *drv = inst->drv; int ret; dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n", inst->cfg->label); if (drv->vbus) { ret = regulator_enable(drv->vbus); if (ret) goto err_regulator; } ret = clk_prepare_enable(drv->clk); if (ret) goto err_main_clk; ret = clk_prepare_enable(drv->ref_clk); if (ret) goto err_instance_clk; if (inst->cfg->power_on) { spin_lock(&drv->lock); ret = inst->cfg->power_on(inst); spin_unlock(&drv->lock); if (ret) goto err_power_on; } return 0; err_power_on: clk_disable_unprepare(drv->ref_clk); err_instance_clk: clk_disable_unprepare(drv->clk); err_main_clk: if (drv->vbus) regulator_disable(drv->vbus); err_regulator: return ret; } static int samsung_usb2_phy_power_off(struct phy *phy) { struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy); struct samsung_usb2_phy_driver *drv = inst->drv; int ret = 0; dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n", inst->cfg->label); if (inst->cfg->power_off) { spin_lock(&drv->lock); ret = inst->cfg->power_off(inst); spin_unlock(&drv->lock); if (ret) return ret; } clk_disable_unprepare(drv->ref_clk); clk_disable_unprepare(drv->clk); if (drv->vbus) ret = regulator_disable(drv->vbus); return ret; } static const struct phy_ops samsung_usb2_phy_ops = { .power_on = samsung_usb2_phy_power_on, .power_off = samsung_usb2_phy_power_off, .owner = THIS_MODULE, }; static struct phy *samsung_usb2_phy_xlate(struct device *dev, struct of_phandle_args *args) { struct samsung_usb2_phy_driver *drv; drv = dev_get_drvdata(dev); if (!drv) return ERR_PTR(-EINVAL); if (WARN_ON(args->args[0] >= drv->cfg->num_phys)) return ERR_PTR(-ENODEV); return drv->instances[args->args[0]].phy; } static const struct of_device_id samsung_usb2_phy_of_match[] = { #ifdef CONFIG_PHY_EXYNOS4X12_USB2 { .compatible = "samsung,exynos3250-usb2-phy", .data = &exynos3250_usb2_phy_config, }, #endif #ifdef CONFIG_PHY_EXYNOS4210_USB2 { .compatible = "samsung,exynos4210-usb2-phy", .data = &exynos4210_usb2_phy_config, }, #endif #ifdef CONFIG_PHY_EXYNOS4X12_USB2 { .compatible = "samsung,exynos4x12-usb2-phy", .data = &exynos4x12_usb2_phy_config, }, #endif #ifdef CONFIG_PHY_EXYNOS5250_USB2 { .compatible = "samsung,exynos5250-usb2-phy", .data = &exynos5250_usb2_phy_config, }, #endif #ifdef CONFIG_PHY_S5PV210_USB2 { .compatible = "samsung,s5pv210-usb2-phy", .data = &s5pv210_usb2_phy_config, }, #endif { }, }; MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match); static int samsung_usb2_phy_probe(struct platform_device *pdev) { const struct of_device_id *match; const struct samsung_usb2_phy_config *cfg; struct device *dev = &pdev->dev; struct phy_provider *phy_provider; struct resource *mem; struct samsung_usb2_phy_driver *drv; int i, ret; if (!pdev->dev.of_node) { dev_err(dev, "This driver is required to be instantiated from device tree\n"); return -EINVAL; } match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node); if (!match) { dev_err(dev, "of_match_node() failed\n"); return -EINVAL; } cfg = match->data; drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) + cfg->num_phys * sizeof(struct samsung_usb2_phy_instance), GFP_KERNEL); if (!drv) return -ENOMEM; dev_set_drvdata(dev, drv); spin_lock_init(&drv->lock); drv->cfg = cfg; drv->dev = dev; mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); drv->reg_phy = devm_ioremap_resource(dev, mem); if (IS_ERR(drv->reg_phy)) { dev_err(dev, "Failed to map register memory (phy)\n"); return PTR_ERR(drv->reg_phy); } drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "samsung,pmureg-phandle"); if (IS_ERR(drv->reg_pmu)) { dev_err(dev, "Failed to map PMU registers (via syscon)\n"); return PTR_ERR(drv->reg_pmu); } if (drv->cfg->has_mode_switch) { drv->reg_sys = syscon_regmap_lookup_by_phandle( pdev->dev.of_node, "samsung,sysreg-phandle"); if (IS_ERR(drv->reg_sys)) { dev_err(dev, "Failed to map system registers (via syscon)\n"); return PTR_ERR(drv->reg_sys); } } drv->clk = devm_clk_get(dev, "phy"); if (IS_ERR(drv->clk)) { dev_err(dev, "Failed to get clock of phy controller\n"); return PTR_ERR(drv->clk); } drv->ref_clk = devm_clk_get(dev, "ref"); if (IS_ERR(drv->ref_clk)) { dev_err(dev, "Failed to get reference clock for the phy controller\n"); return PTR_ERR(drv->ref_clk); } drv->ref_rate = clk_get_rate(drv->ref_clk); if (drv->cfg->rate_to_clk) { ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val); if (ret) return ret; } drv->vbus = devm_regulator_get(dev, "vbus"); if (IS_ERR(drv->vbus)) { ret = PTR_ERR(drv->vbus); if (ret == -EPROBE_DEFER) return ret; drv->vbus = NULL; } for (i = 0; i < drv->cfg->num_phys; i++) { char *label = drv->cfg->phys[i].label; struct samsung_usb2_phy_instance *p = &drv->instances[i]; dev_dbg(dev, "Creating phy \"%s\"\n", label); p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops); if (IS_ERR(p->phy)) { dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n", label); return PTR_ERR(p->phy); } p->cfg = &drv->cfg->phys[i]; p->drv = drv; phy_set_bus_width(p->phy, 8); phy_set_drvdata(p->phy, p); } phy_provider = devm_of_phy_provider_register(dev, samsung_usb2_phy_xlate); if (IS_ERR(phy_provider)) { dev_err(drv->dev, "Failed to register phy provider\n"); return PTR_ERR(phy_provider); } return 0; } static struct platform_driver samsung_usb2_phy_driver = { .probe = samsung_usb2_phy_probe, .driver = { .of_match_table = samsung_usb2_phy_of_match, .name = "samsung-usb2-phy", } }; module_platform_driver(samsung_usb2_phy_driver); MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver"); MODULE_AUTHOR("Kamil Debski "); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:samsung-usb2-phy");