1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * HiSilicon INNO USB2 PHY Driver. 4 * 5 * Copyright (c) 2016-2017 HiSilicon Technologies Co., Ltd. 6 */ 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/reset.h> 16 17 #define INNO_PHY_PORT_NUM 2 18 #define REF_CLK_STABLE_TIME 100 /* unit:us */ 19 #define UTMI_CLK_STABLE_TIME 200 /* unit:us */ 20 #define TEST_CLK_STABLE_TIME 2 /* unit:ms */ 21 #define PHY_CLK_STABLE_TIME 2 /* unit:ms */ 22 #define UTMI_RST_COMPLETE_TIME 2 /* unit:ms */ 23 #define POR_RST_COMPLETE_TIME 300 /* unit:us */ 24 25 #define PHY_TYPE_0 0 26 #define PHY_TYPE_1 1 27 28 #define PHY_TEST_DATA GENMASK(7, 0) 29 #define PHY_TEST_ADDR_OFFSET 8 30 #define PHY0_TEST_ADDR GENMASK(15, 8) 31 #define PHY0_TEST_PORT_OFFSET 16 32 #define PHY0_TEST_PORT GENMASK(18, 16) 33 #define PHY0_TEST_WREN BIT(21) 34 #define PHY0_TEST_CLK BIT(22) /* rising edge active */ 35 #define PHY0_TEST_RST BIT(23) /* low active */ 36 #define PHY1_TEST_ADDR GENMASK(11, 8) 37 #define PHY1_TEST_PORT_OFFSET 12 38 #define PHY1_TEST_PORT BIT(12) 39 #define PHY1_TEST_WREN BIT(13) 40 #define PHY1_TEST_CLK BIT(14) /* rising edge active */ 41 #define PHY1_TEST_RST BIT(15) /* low active */ 42 43 #define PHY_CLK_ENABLE BIT(2) 44 45 struct hisi_inno_phy_port { 46 struct reset_control *utmi_rst; 47 struct hisi_inno_phy_priv *priv; 48 }; 49 50 struct hisi_inno_phy_priv { 51 void __iomem *mmio; 52 struct clk *ref_clk; 53 struct reset_control *por_rst; 54 unsigned int type; 55 struct hisi_inno_phy_port ports[INNO_PHY_PORT_NUM]; 56 }; 57 58 static void hisi_inno_phy_write_reg(struct hisi_inno_phy_priv *priv, 59 u8 port, u32 addr, u32 data) 60 { 61 void __iomem *reg = priv->mmio; 62 u32 val; 63 u32 value; 64 65 if (priv->type == PHY_TYPE_0) 66 val = (data & PHY_TEST_DATA) | 67 ((addr << PHY_TEST_ADDR_OFFSET) & PHY0_TEST_ADDR) | 68 ((port << PHY0_TEST_PORT_OFFSET) & PHY0_TEST_PORT) | 69 PHY0_TEST_WREN | PHY0_TEST_RST; 70 else 71 val = (data & PHY_TEST_DATA) | 72 ((addr << PHY_TEST_ADDR_OFFSET) & PHY1_TEST_ADDR) | 73 ((port << PHY1_TEST_PORT_OFFSET) & PHY1_TEST_PORT) | 74 PHY1_TEST_WREN | PHY1_TEST_RST; 75 writel(val, reg); 76 77 value = val; 78 if (priv->type == PHY_TYPE_0) 79 value |= PHY0_TEST_CLK; 80 else 81 value |= PHY1_TEST_CLK; 82 writel(value, reg); 83 84 writel(val, reg); 85 } 86 87 static void hisi_inno_phy_setup(struct hisi_inno_phy_priv *priv) 88 { 89 /* The phy clk is controlled by the port0 register 0x06. */ 90 hisi_inno_phy_write_reg(priv, 0, 0x06, PHY_CLK_ENABLE); 91 msleep(PHY_CLK_STABLE_TIME); 92 } 93 94 static int hisi_inno_phy_init(struct phy *phy) 95 { 96 struct hisi_inno_phy_port *port = phy_get_drvdata(phy); 97 struct hisi_inno_phy_priv *priv = port->priv; 98 int ret; 99 100 ret = clk_prepare_enable(priv->ref_clk); 101 if (ret) 102 return ret; 103 udelay(REF_CLK_STABLE_TIME); 104 105 reset_control_deassert(priv->por_rst); 106 udelay(POR_RST_COMPLETE_TIME); 107 108 /* Set up phy registers */ 109 hisi_inno_phy_setup(priv); 110 111 reset_control_deassert(port->utmi_rst); 112 udelay(UTMI_RST_COMPLETE_TIME); 113 114 return 0; 115 } 116 117 static int hisi_inno_phy_exit(struct phy *phy) 118 { 119 struct hisi_inno_phy_port *port = phy_get_drvdata(phy); 120 struct hisi_inno_phy_priv *priv = port->priv; 121 122 reset_control_assert(port->utmi_rst); 123 reset_control_assert(priv->por_rst); 124 clk_disable_unprepare(priv->ref_clk); 125 126 return 0; 127 } 128 129 static const struct phy_ops hisi_inno_phy_ops = { 130 .init = hisi_inno_phy_init, 131 .exit = hisi_inno_phy_exit, 132 .owner = THIS_MODULE, 133 }; 134 135 static int hisi_inno_phy_probe(struct platform_device *pdev) 136 { 137 struct device *dev = &pdev->dev; 138 struct device_node *np = dev->of_node; 139 struct hisi_inno_phy_priv *priv; 140 struct phy_provider *provider; 141 int i = 0; 142 int ret; 143 144 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 145 if (!priv) 146 return -ENOMEM; 147 148 priv->mmio = devm_platform_ioremap_resource(pdev, 0); 149 if (IS_ERR(priv->mmio)) { 150 ret = PTR_ERR(priv->mmio); 151 return ret; 152 } 153 154 priv->ref_clk = devm_clk_get(dev, NULL); 155 if (IS_ERR(priv->ref_clk)) 156 return PTR_ERR(priv->ref_clk); 157 158 priv->por_rst = devm_reset_control_get_exclusive(dev, NULL); 159 if (IS_ERR(priv->por_rst)) 160 return PTR_ERR(priv->por_rst); 161 162 priv->type = (uintptr_t) of_device_get_match_data(dev); 163 164 for_each_child_of_node_scoped(np, child) { 165 struct reset_control *rst; 166 struct phy *phy; 167 168 rst = of_reset_control_get_exclusive(child, NULL); 169 if (IS_ERR(rst)) 170 return PTR_ERR(rst); 171 172 priv->ports[i].utmi_rst = rst; 173 priv->ports[i].priv = priv; 174 175 phy = devm_phy_create(dev, child, &hisi_inno_phy_ops); 176 if (IS_ERR(phy)) 177 return PTR_ERR(phy); 178 179 phy_set_bus_width(phy, 8); 180 phy_set_drvdata(phy, &priv->ports[i]); 181 i++; 182 183 if (i >= INNO_PHY_PORT_NUM) { 184 dev_warn(dev, "Support %d ports in maximum\n", i); 185 break; 186 } 187 } 188 189 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 190 return PTR_ERR_OR_ZERO(provider); 191 } 192 193 static const struct of_device_id hisi_inno_phy_of_match[] = { 194 { .compatible = "hisilicon,inno-usb2-phy", 195 .data = (void *) PHY_TYPE_0 }, 196 { .compatible = "hisilicon,hi3798cv200-usb2-phy", 197 .data = (void *) PHY_TYPE_0 }, 198 { .compatible = "hisilicon,hi3798mv100-usb2-phy", 199 .data = (void *) PHY_TYPE_1 }, 200 { }, 201 }; 202 MODULE_DEVICE_TABLE(of, hisi_inno_phy_of_match); 203 204 static struct platform_driver hisi_inno_phy_driver = { 205 .probe = hisi_inno_phy_probe, 206 .driver = { 207 .name = "hisi-inno-phy", 208 .of_match_table = hisi_inno_phy_of_match, 209 } 210 }; 211 module_platform_driver(hisi_inno_phy_driver); 212 213 MODULE_DESCRIPTION("HiSilicon INNO USB2 PHY Driver"); 214 MODULE_LICENSE("GPL v2"); 215