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1// SPDX-License-Identifier: GPL-2.02/*3 * Renesas R-Car Gen3 for USB3.0 PHY driver4 *5 * Copyright (C) 2017 Renesas Electronics Corporation6 */7 8#include <linux/clk.h>9#include <linux/delay.h>10#include <linux/io.h>11#include <linux/module.h>12#include <linux/of.h>13#include <linux/phy/phy.h>14#include <linux/platform_device.h>15#include <linux/pm_runtime.h>16 17#define USB30_CLKSET0 0x03418#define USB30_CLKSET1 0x03619#define USB30_SSC_SET 0x03820#define USB30_PHY_ENABLE 0x06021#define USB30_VBUS_EN 0x06422 23/* USB30_CLKSET0 */24#define CLKSET0_PRIVATE 0x05c025#define CLKSET0_USB30_FSEL_USB_EXTAL 0x000226 27/* USB30_CLKSET1 */28#define CLKSET1_USB30_PLL_MULTI_SHIFT 629#define CLKSET1_USB30_PLL_MULTI_USB_EXTAL (0x64 << \30 CLKSET1_USB30_PLL_MULTI_SHIFT)31#define CLKSET1_PHYRESET BIT(4) /* 1: reset */32#define CLKSET1_REF_CLKDIV BIT(3) /* 1: USB_EXTAL */33#define CLKSET1_PRIVATE_2_1 BIT(1) /* Write B'01 */34#define CLKSET1_REF_CLK_SEL BIT(0) /* 1: USB3S0_CLK_P */35 36/* USB30_SSC_SET */37#define SSC_SET_SSC_EN BIT(12)38#define SSC_SET_RANGE_SHIFT 939#define SSC_SET_RANGE_4980 (0x0 << SSC_SET_RANGE_SHIFT)40#define SSC_SET_RANGE_4492 (0x1 << SSC_SET_RANGE_SHIFT)41#define SSC_SET_RANGE_4003 (0x2 << SSC_SET_RANGE_SHIFT)42 43/* USB30_PHY_ENABLE */44#define PHY_ENABLE_RESET_EN BIT(4)45 46/* USB30_VBUS_EN */47#define VBUS_EN_VBUS_EN BIT(1)48 49struct rcar_gen3_usb3 {50 void __iomem *base;51 struct phy *phy;52 u32 ssc_range;53 bool usb3s_clk;54 bool usb_extal;55};56 57static void write_clkset1_for_usb_extal(struct rcar_gen3_usb3 *r, bool reset)58{59 u16 val = CLKSET1_USB30_PLL_MULTI_USB_EXTAL |60 CLKSET1_REF_CLKDIV | CLKSET1_PRIVATE_2_1;61 62 if (reset)63 val |= CLKSET1_PHYRESET;64 65 writew(val, r->base + USB30_CLKSET1);66}67 68static void rcar_gen3_phy_usb3_enable_ssc(struct rcar_gen3_usb3 *r)69{70 u16 val = SSC_SET_SSC_EN;71 72 switch (r->ssc_range) {73 case 4980:74 val |= SSC_SET_RANGE_4980;75 break;76 case 4492:77 val |= SSC_SET_RANGE_4492;78 break;79 case 4003:80 val |= SSC_SET_RANGE_4003;81 break;82 default:83 dev_err(&r->phy->dev, "%s: unsupported range (%x)\n", __func__,84 r->ssc_range);85 return;86 }87 88 writew(val, r->base + USB30_SSC_SET);89}90 91static void rcar_gen3_phy_usb3_select_usb_extal(struct rcar_gen3_usb3 *r)92{93 write_clkset1_for_usb_extal(r, false);94 if (r->ssc_range)95 rcar_gen3_phy_usb3_enable_ssc(r);96 writew(CLKSET0_PRIVATE | CLKSET0_USB30_FSEL_USB_EXTAL,97 r->base + USB30_CLKSET0);98 writew(PHY_ENABLE_RESET_EN, r->base + USB30_PHY_ENABLE);99 write_clkset1_for_usb_extal(r, true);100 usleep_range(10, 20);101 write_clkset1_for_usb_extal(r, false);102}103 104static int rcar_gen3_phy_usb3_init(struct phy *p)105{106 struct rcar_gen3_usb3 *r = phy_get_drvdata(p);107 108 dev_vdbg(&r->phy->dev, "%s: enter (%d, %d, %d)\n", __func__,109 r->usb3s_clk, r->usb_extal, r->ssc_range);110 111 if (!r->usb3s_clk && r->usb_extal)112 rcar_gen3_phy_usb3_select_usb_extal(r);113 114 /* Enables VBUS detection anyway */115 writew(VBUS_EN_VBUS_EN, r->base + USB30_VBUS_EN);116 117 return 0;118}119 120static const struct phy_ops rcar_gen3_phy_usb3_ops = {121 .init = rcar_gen3_phy_usb3_init,122 .owner = THIS_MODULE,123};124 125static const struct of_device_id rcar_gen3_phy_usb3_match_table[] = {126 { .compatible = "renesas,rcar-gen3-usb3-phy" },127 { }128};129MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb3_match_table);130 131static int rcar_gen3_phy_usb3_probe(struct platform_device *pdev)132{133 struct device *dev = &pdev->dev;134 struct rcar_gen3_usb3 *r;135 struct phy_provider *provider;136 int ret = 0;137 struct clk *clk;138 139 if (!dev->of_node) {140 dev_err(dev, "This driver needs device tree\n");141 return -EINVAL;142 }143 144 r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL);145 if (!r)146 return -ENOMEM;147 148 r->base = devm_platform_ioremap_resource(pdev, 0);149 if (IS_ERR(r->base))150 return PTR_ERR(r->base);151 152 clk = devm_clk_get(dev, "usb3s_clk");153 if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {154 r->usb3s_clk = !!clk_get_rate(clk);155 clk_disable_unprepare(clk);156 }157 clk = devm_clk_get(dev, "usb_extal");158 if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {159 r->usb_extal = !!clk_get_rate(clk);160 clk_disable_unprepare(clk);161 }162 163 if (!r->usb3s_clk && !r->usb_extal) {164 dev_err(dev, "This driver needs usb3s_clk and/or usb_extal\n");165 ret = -EINVAL;166 goto error;167 }168 169 /*170 * devm_phy_create() will call pm_runtime_enable(&phy->dev);171 * And then, phy-core will manage runtime pm for this device.172 */173 pm_runtime_enable(dev);174 175 r->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops);176 if (IS_ERR(r->phy)) {177 dev_err(dev, "Failed to create USB3 PHY\n");178 ret = PTR_ERR(r->phy);179 goto error;180 }181 182 of_property_read_u32(dev->of_node, "renesas,ssc-range", &r->ssc_range);183 184 platform_set_drvdata(pdev, r);185 phy_set_drvdata(r->phy, r);186 187 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);188 if (IS_ERR(provider)) {189 dev_err(dev, "Failed to register PHY provider\n");190 ret = PTR_ERR(provider);191 goto error;192 }193 194 return 0;195 196error:197 pm_runtime_disable(dev);198 199 return ret;200}201 202static void rcar_gen3_phy_usb3_remove(struct platform_device *pdev)203{204 pm_runtime_disable(&pdev->dev);205};206 207static struct platform_driver rcar_gen3_phy_usb3_driver = {208 .driver = {209 .name = "phy_rcar_gen3_usb3",210 .of_match_table = rcar_gen3_phy_usb3_match_table,211 },212 .probe = rcar_gen3_phy_usb3_probe,213 .remove_new = rcar_gen3_phy_usb3_remove,214};215module_platform_driver(rcar_gen3_phy_usb3_driver);216 217MODULE_LICENSE("GPL v2");218MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 3.0 PHY");219MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");220