1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * dwc3-exynos.c - Samsung Exynos DWC3 Specific Glue layer 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com 7 * 8 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/platform_device.h> 15 #include <linux/clk.h> 16 #include <linux/of.h> 17 #include <linux/of_platform.h> 18 #include <linux/regulator/consumer.h> 19 20 #define DWC3_EXYNOS_MAX_CLOCKS 4 21 22 struct dwc3_exynos_driverdata { 23 const char *clk_names[DWC3_EXYNOS_MAX_CLOCKS]; 24 int num_clks; 25 int suspend_clk_idx; 26 }; 27 28 struct dwc3_exynos { 29 struct device *dev; 30 31 const char **clk_names; 32 struct clk *clks[DWC3_EXYNOS_MAX_CLOCKS]; 33 int num_clks; 34 int suspend_clk_idx; 35 36 struct regulator *vdd33; 37 struct regulator *vdd10; 38 }; 39 40 static int dwc3_exynos_probe(struct platform_device *pdev) 41 { 42 struct dwc3_exynos *exynos; 43 struct device *dev = &pdev->dev; 44 struct device_node *node = dev->of_node; 45 const struct dwc3_exynos_driverdata *driver_data; 46 int i, ret; 47 48 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL); 49 if (!exynos) 50 return -ENOMEM; 51 52 driver_data = of_device_get_match_data(dev); 53 exynos->dev = dev; 54 exynos->num_clks = driver_data->num_clks; 55 exynos->clk_names = (const char **)driver_data->clk_names; 56 exynos->suspend_clk_idx = driver_data->suspend_clk_idx; 57 58 platform_set_drvdata(pdev, exynos); 59 60 for (i = 0; i < exynos->num_clks; i++) { 61 exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]); 62 if (IS_ERR(exynos->clks[i])) { 63 dev_err(dev, "failed to get clock: %s\n", 64 exynos->clk_names[i]); 65 return PTR_ERR(exynos->clks[i]); 66 } 67 } 68 69 for (i = 0; i < exynos->num_clks; i++) { 70 ret = clk_prepare_enable(exynos->clks[i]); 71 if (ret) { 72 while (i-- > 0) 73 clk_disable_unprepare(exynos->clks[i]); 74 return ret; 75 } 76 } 77 78 if (exynos->suspend_clk_idx >= 0) 79 clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]); 80 81 exynos->vdd33 = devm_regulator_get(dev, "vdd33"); 82 if (IS_ERR(exynos->vdd33)) { 83 ret = PTR_ERR(exynos->vdd33); 84 goto vdd33_err; 85 } 86 ret = regulator_enable(exynos->vdd33); 87 if (ret) { 88 dev_err(dev, "Failed to enable VDD33 supply\n"); 89 goto vdd33_err; 90 } 91 92 exynos->vdd10 = devm_regulator_get(dev, "vdd10"); 93 if (IS_ERR(exynos->vdd10)) { 94 ret = PTR_ERR(exynos->vdd10); 95 goto vdd10_err; 96 } 97 ret = regulator_enable(exynos->vdd10); 98 if (ret) { 99 dev_err(dev, "Failed to enable VDD10 supply\n"); 100 goto vdd10_err; 101 } 102 103 if (node) { 104 ret = of_platform_populate(node, NULL, NULL, dev); 105 if (ret) { 106 dev_err(dev, "failed to add dwc3 core\n"); 107 goto populate_err; 108 } 109 } else { 110 dev_err(dev, "no device node, failed to add dwc3 core\n"); 111 ret = -ENODEV; 112 goto populate_err; 113 } 114 115 return 0; 116 117 populate_err: 118 regulator_disable(exynos->vdd10); 119 vdd10_err: 120 regulator_disable(exynos->vdd33); 121 vdd33_err: 122 for (i = exynos->num_clks - 1; i >= 0; i--) 123 clk_disable_unprepare(exynos->clks[i]); 124 125 if (exynos->suspend_clk_idx >= 0) 126 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]); 127 128 return ret; 129 } 130 131 static void dwc3_exynos_remove(struct platform_device *pdev) 132 { 133 struct dwc3_exynos *exynos = platform_get_drvdata(pdev); 134 int i; 135 136 of_platform_depopulate(&pdev->dev); 137 138 for (i = exynos->num_clks - 1; i >= 0; i--) 139 clk_disable_unprepare(exynos->clks[i]); 140 141 if (exynos->suspend_clk_idx >= 0) 142 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]); 143 144 regulator_disable(exynos->vdd33); 145 regulator_disable(exynos->vdd10); 146 } 147 148 static const struct dwc3_exynos_driverdata exynos5250_drvdata = { 149 .clk_names = { "usbdrd30" }, 150 .num_clks = 1, 151 .suspend_clk_idx = -1, 152 }; 153 154 static const struct dwc3_exynos_driverdata exynos5433_drvdata = { 155 .clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" }, 156 .num_clks = 4, 157 .suspend_clk_idx = 1, 158 }; 159 160 static const struct dwc3_exynos_driverdata exynos7_drvdata = { 161 .clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" }, 162 .num_clks = 3, 163 .suspend_clk_idx = 1, 164 }; 165 166 static const struct dwc3_exynos_driverdata exynos850_drvdata = { 167 .clk_names = { "bus_early", "ref" }, 168 .num_clks = 2, 169 .suspend_clk_idx = -1, 170 }; 171 172 static const struct of_device_id exynos_dwc3_match[] = { 173 { 174 .compatible = "samsung,exynos5250-dwusb3", 175 .data = &exynos5250_drvdata, 176 }, { 177 .compatible = "samsung,exynos5433-dwusb3", 178 .data = &exynos5433_drvdata, 179 }, { 180 .compatible = "samsung,exynos7-dwusb3", 181 .data = &exynos7_drvdata, 182 }, { 183 .compatible = "samsung,exynos850-dwusb3", 184 .data = &exynos850_drvdata, 185 }, { 186 } 187 }; 188 MODULE_DEVICE_TABLE(of, exynos_dwc3_match); 189 190 #ifdef CONFIG_PM_SLEEP 191 static int dwc3_exynos_suspend(struct device *dev) 192 { 193 struct dwc3_exynos *exynos = dev_get_drvdata(dev); 194 int i; 195 196 for (i = exynos->num_clks - 1; i >= 0; i--) 197 clk_disable_unprepare(exynos->clks[i]); 198 199 regulator_disable(exynos->vdd33); 200 regulator_disable(exynos->vdd10); 201 202 return 0; 203 } 204 205 static int dwc3_exynos_resume(struct device *dev) 206 { 207 struct dwc3_exynos *exynos = dev_get_drvdata(dev); 208 int i, ret; 209 210 ret = regulator_enable(exynos->vdd33); 211 if (ret) { 212 dev_err(dev, "Failed to enable VDD33 supply\n"); 213 return ret; 214 } 215 ret = regulator_enable(exynos->vdd10); 216 if (ret) { 217 dev_err(dev, "Failed to enable VDD10 supply\n"); 218 return ret; 219 } 220 221 for (i = 0; i < exynos->num_clks; i++) { 222 ret = clk_prepare_enable(exynos->clks[i]); 223 if (ret) { 224 while (i-- > 0) 225 clk_disable_unprepare(exynos->clks[i]); 226 return ret; 227 } 228 } 229 230 return 0; 231 } 232 233 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = { 234 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume) 235 }; 236 237 #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops) 238 #else 239 #define DEV_PM_OPS NULL 240 #endif /* CONFIG_PM_SLEEP */ 241 242 static struct platform_driver dwc3_exynos_driver = { 243 .probe = dwc3_exynos_probe, 244 .remove_new = dwc3_exynos_remove, 245 .driver = { 246 .name = "exynos-dwc3", 247 .of_match_table = exynos_dwc3_match, 248 .pm = DEV_PM_OPS, 249 }, 250 }; 251 252 module_platform_driver(dwc3_exynos_driver); 253 254 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>"); 255 MODULE_LICENSE("GPL v2"); 256 MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer"); 257