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_remove_child(struct device *dev, void *unused) 41 { 42 struct platform_device *pdev = to_platform_device(dev); 43 44 platform_device_unregister(pdev); 45 46 return 0; 47 } 48 49 static int dwc3_exynos_probe(struct platform_device *pdev) 50 { 51 struct dwc3_exynos *exynos; 52 struct device *dev = &pdev->dev; 53 struct device_node *node = dev->of_node; 54 const struct dwc3_exynos_driverdata *driver_data; 55 int i, ret; 56 57 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL); 58 if (!exynos) 59 return -ENOMEM; 60 61 driver_data = of_device_get_match_data(dev); 62 exynos->dev = dev; 63 exynos->num_clks = driver_data->num_clks; 64 exynos->clk_names = (const char **)driver_data->clk_names; 65 exynos->suspend_clk_idx = driver_data->suspend_clk_idx; 66 67 platform_set_drvdata(pdev, exynos); 68 69 for (i = 0; i < exynos->num_clks; i++) { 70 exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]); 71 if (IS_ERR(exynos->clks[i])) { 72 dev_err(dev, "failed to get clock: %s\n", 73 exynos->clk_names[i]); 74 return PTR_ERR(exynos->clks[i]); 75 } 76 } 77 78 for (i = 0; i < exynos->num_clks; i++) { 79 ret = clk_prepare_enable(exynos->clks[i]); 80 if (ret) { 81 while (i-- > 0) 82 clk_disable_unprepare(exynos->clks[i]); 83 return ret; 84 } 85 } 86 87 if (exynos->suspend_clk_idx >= 0) 88 clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]); 89 90 exynos->vdd33 = devm_regulator_get(dev, "vdd33"); 91 if (IS_ERR(exynos->vdd33)) { 92 ret = PTR_ERR(exynos->vdd33); 93 goto vdd33_err; 94 } 95 ret = regulator_enable(exynos->vdd33); 96 if (ret) { 97 dev_err(dev, "Failed to enable VDD33 supply\n"); 98 goto vdd33_err; 99 } 100 101 exynos->vdd10 = devm_regulator_get(dev, "vdd10"); 102 if (IS_ERR(exynos->vdd10)) { 103 ret = PTR_ERR(exynos->vdd10); 104 goto vdd10_err; 105 } 106 ret = regulator_enable(exynos->vdd10); 107 if (ret) { 108 dev_err(dev, "Failed to enable VDD10 supply\n"); 109 goto vdd10_err; 110 } 111 112 if (node) { 113 ret = of_platform_populate(node, NULL, NULL, dev); 114 if (ret) { 115 dev_err(dev, "failed to add dwc3 core\n"); 116 goto populate_err; 117 } 118 } else { 119 dev_err(dev, "no device node, failed to add dwc3 core\n"); 120 ret = -ENODEV; 121 goto populate_err; 122 } 123 124 return 0; 125 126 populate_err: 127 regulator_disable(exynos->vdd10); 128 vdd10_err: 129 regulator_disable(exynos->vdd33); 130 vdd33_err: 131 for (i = exynos->num_clks - 1; i >= 0; i--) 132 clk_disable_unprepare(exynos->clks[i]); 133 134 if (exynos->suspend_clk_idx >= 0) 135 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]); 136 137 return ret; 138 } 139 140 static int dwc3_exynos_remove(struct platform_device *pdev) 141 { 142 struct dwc3_exynos *exynos = platform_get_drvdata(pdev); 143 int i; 144 145 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child); 146 147 for (i = exynos->num_clks - 1; i >= 0; i--) 148 clk_disable_unprepare(exynos->clks[i]); 149 150 if (exynos->suspend_clk_idx >= 0) 151 clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]); 152 153 regulator_disable(exynos->vdd33); 154 regulator_disable(exynos->vdd10); 155 156 return 0; 157 } 158 159 static const struct dwc3_exynos_driverdata exynos5250_drvdata = { 160 .clk_names = { "usbdrd30" }, 161 .num_clks = 1, 162 .suspend_clk_idx = -1, 163 }; 164 165 static const struct dwc3_exynos_driverdata exynos5433_drvdata = { 166 .clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" }, 167 .num_clks = 4, 168 .suspend_clk_idx = 1, 169 }; 170 171 static const struct dwc3_exynos_driverdata exynos7_drvdata = { 172 .clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" }, 173 .num_clks = 3, 174 .suspend_clk_idx = 1, 175 }; 176 177 static const struct of_device_id exynos_dwc3_match[] = { 178 { 179 .compatible = "samsung,exynos5250-dwusb3", 180 .data = &exynos5250_drvdata, 181 }, { 182 .compatible = "samsung,exynos5433-dwusb3", 183 .data = &exynos5433_drvdata, 184 }, { 185 .compatible = "samsung,exynos7-dwusb3", 186 .data = &exynos7_drvdata, 187 }, { 188 } 189 }; 190 MODULE_DEVICE_TABLE(of, exynos_dwc3_match); 191 192 #ifdef CONFIG_PM_SLEEP 193 static int dwc3_exynos_suspend(struct device *dev) 194 { 195 struct dwc3_exynos *exynos = dev_get_drvdata(dev); 196 int i; 197 198 for (i = exynos->num_clks - 1; i >= 0; i--) 199 clk_disable_unprepare(exynos->clks[i]); 200 201 regulator_disable(exynos->vdd33); 202 regulator_disable(exynos->vdd10); 203 204 return 0; 205 } 206 207 static int dwc3_exynos_resume(struct device *dev) 208 { 209 struct dwc3_exynos *exynos = dev_get_drvdata(dev); 210 int i, ret; 211 212 ret = regulator_enable(exynos->vdd33); 213 if (ret) { 214 dev_err(dev, "Failed to enable VDD33 supply\n"); 215 return ret; 216 } 217 ret = regulator_enable(exynos->vdd10); 218 if (ret) { 219 dev_err(dev, "Failed to enable VDD10 supply\n"); 220 return ret; 221 } 222 223 for (i = 0; i < exynos->num_clks; i++) { 224 ret = clk_prepare_enable(exynos->clks[i]); 225 if (ret) { 226 while (i-- > 0) 227 clk_disable_unprepare(exynos->clks[i]); 228 return ret; 229 } 230 } 231 232 return 0; 233 } 234 235 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = { 236 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume) 237 }; 238 239 #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops) 240 #else 241 #define DEV_PM_OPS NULL 242 #endif /* CONFIG_PM_SLEEP */ 243 244 static struct platform_driver dwc3_exynos_driver = { 245 .probe = dwc3_exynos_probe, 246 .remove = dwc3_exynos_remove, 247 .driver = { 248 .name = "exynos-dwc3", 249 .of_match_table = exynos_dwc3_match, 250 .pm = DEV_PM_OPS, 251 }, 252 }; 253 254 module_platform_driver(dwc3_exynos_driver); 255 256 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>"); 257 MODULE_LICENSE("GPL v2"); 258 MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer"); 259