1 /** 2 * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer 3 * 4 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com 6 * 7 * Author: Anton Tikhomirov <av.tikhomirov@samsung.com> 8 * 9 * This program is free software: you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 of 11 * the License as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/slab.h> 22 #include <linux/platform_device.h> 23 #include <linux/clk.h> 24 #include <linux/usb/otg.h> 25 #include <linux/usb/usb_phy_generic.h> 26 #include <linux/of.h> 27 #include <linux/of_platform.h> 28 #include <linux/regulator/consumer.h> 29 30 struct dwc3_exynos { 31 struct platform_device *usb2_phy; 32 struct platform_device *usb3_phy; 33 struct device *dev; 34 35 struct clk *clk; 36 struct clk *susp_clk; 37 struct clk *axius_clk; 38 39 struct regulator *vdd33; 40 struct regulator *vdd10; 41 }; 42 43 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos) 44 { 45 struct usb_phy_generic_platform_data pdata; 46 struct platform_device *pdev; 47 int ret; 48 49 memset(&pdata, 0x00, sizeof(pdata)); 50 51 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO); 52 if (!pdev) 53 return -ENOMEM; 54 55 exynos->usb2_phy = pdev; 56 pdata.type = USB_PHY_TYPE_USB2; 57 pdata.gpio_reset = -1; 58 59 ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata)); 60 if (ret) 61 goto err1; 62 63 pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO); 64 if (!pdev) { 65 ret = -ENOMEM; 66 goto err1; 67 } 68 69 exynos->usb3_phy = pdev; 70 pdata.type = USB_PHY_TYPE_USB3; 71 72 ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata)); 73 if (ret) 74 goto err2; 75 76 ret = platform_device_add(exynos->usb2_phy); 77 if (ret) 78 goto err2; 79 80 ret = platform_device_add(exynos->usb3_phy); 81 if (ret) 82 goto err3; 83 84 return 0; 85 86 err3: 87 platform_device_del(exynos->usb2_phy); 88 89 err2: 90 platform_device_put(exynos->usb3_phy); 91 92 err1: 93 platform_device_put(exynos->usb2_phy); 94 95 return ret; 96 } 97 98 static int dwc3_exynos_remove_child(struct device *dev, void *unused) 99 { 100 struct platform_device *pdev = to_platform_device(dev); 101 102 platform_device_unregister(pdev); 103 104 return 0; 105 } 106 107 static int dwc3_exynos_probe(struct platform_device *pdev) 108 { 109 struct dwc3_exynos *exynos; 110 struct device *dev = &pdev->dev; 111 struct device_node *node = dev->of_node; 112 113 int ret; 114 115 exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL); 116 if (!exynos) 117 return -ENOMEM; 118 119 platform_set_drvdata(pdev, exynos); 120 121 exynos->dev = dev; 122 123 exynos->clk = devm_clk_get(dev, "usbdrd30"); 124 if (IS_ERR(exynos->clk)) { 125 dev_err(dev, "couldn't get clock\n"); 126 return -EINVAL; 127 } 128 ret = clk_prepare_enable(exynos->clk); 129 if (ret) 130 return ret; 131 132 exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk"); 133 if (IS_ERR(exynos->susp_clk)) 134 exynos->susp_clk = NULL; 135 ret = clk_prepare_enable(exynos->susp_clk); 136 if (ret) 137 goto susp_clk_err; 138 139 if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) { 140 exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk"); 141 if (IS_ERR(exynos->axius_clk)) { 142 dev_err(dev, "no AXI UpScaler clk specified\n"); 143 ret = -ENODEV; 144 goto axius_clk_err; 145 } 146 ret = clk_prepare_enable(exynos->axius_clk); 147 if (ret) 148 goto axius_clk_err; 149 } else { 150 exynos->axius_clk = NULL; 151 } 152 153 exynos->vdd33 = devm_regulator_get(dev, "vdd33"); 154 if (IS_ERR(exynos->vdd33)) { 155 ret = PTR_ERR(exynos->vdd33); 156 goto vdd33_err; 157 } 158 ret = regulator_enable(exynos->vdd33); 159 if (ret) { 160 dev_err(dev, "Failed to enable VDD33 supply\n"); 161 goto vdd33_err; 162 } 163 164 exynos->vdd10 = devm_regulator_get(dev, "vdd10"); 165 if (IS_ERR(exynos->vdd10)) { 166 ret = PTR_ERR(exynos->vdd10); 167 goto vdd10_err; 168 } 169 ret = regulator_enable(exynos->vdd10); 170 if (ret) { 171 dev_err(dev, "Failed to enable VDD10 supply\n"); 172 goto vdd10_err; 173 } 174 175 ret = dwc3_exynos_register_phys(exynos); 176 if (ret) { 177 dev_err(dev, "couldn't register PHYs\n"); 178 goto phys_err; 179 } 180 181 if (node) { 182 ret = of_platform_populate(node, NULL, NULL, dev); 183 if (ret) { 184 dev_err(dev, "failed to add dwc3 core\n"); 185 goto populate_err; 186 } 187 } else { 188 dev_err(dev, "no device node, failed to add dwc3 core\n"); 189 ret = -ENODEV; 190 goto populate_err; 191 } 192 193 return 0; 194 195 populate_err: 196 platform_device_unregister(exynos->usb2_phy); 197 platform_device_unregister(exynos->usb3_phy); 198 phys_err: 199 regulator_disable(exynos->vdd10); 200 vdd10_err: 201 regulator_disable(exynos->vdd33); 202 vdd33_err: 203 clk_disable_unprepare(exynos->axius_clk); 204 axius_clk_err: 205 clk_disable_unprepare(exynos->susp_clk); 206 susp_clk_err: 207 clk_disable_unprepare(exynos->clk); 208 return ret; 209 } 210 211 static int dwc3_exynos_remove(struct platform_device *pdev) 212 { 213 struct dwc3_exynos *exynos = platform_get_drvdata(pdev); 214 215 device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child); 216 platform_device_unregister(exynos->usb2_phy); 217 platform_device_unregister(exynos->usb3_phy); 218 219 clk_disable_unprepare(exynos->axius_clk); 220 clk_disable_unprepare(exynos->susp_clk); 221 clk_disable_unprepare(exynos->clk); 222 223 regulator_disable(exynos->vdd33); 224 regulator_disable(exynos->vdd10); 225 226 return 0; 227 } 228 229 static const struct of_device_id exynos_dwc3_match[] = { 230 { .compatible = "samsung,exynos5250-dwusb3" }, 231 { .compatible = "samsung,exynos7-dwusb3" }, 232 {}, 233 }; 234 MODULE_DEVICE_TABLE(of, exynos_dwc3_match); 235 236 #ifdef CONFIG_PM_SLEEP 237 static int dwc3_exynos_suspend(struct device *dev) 238 { 239 struct dwc3_exynos *exynos = dev_get_drvdata(dev); 240 241 clk_disable(exynos->axius_clk); 242 clk_disable(exynos->clk); 243 244 regulator_disable(exynos->vdd33); 245 regulator_disable(exynos->vdd10); 246 247 return 0; 248 } 249 250 static int dwc3_exynos_resume(struct device *dev) 251 { 252 struct dwc3_exynos *exynos = dev_get_drvdata(dev); 253 int ret; 254 255 ret = regulator_enable(exynos->vdd33); 256 if (ret) { 257 dev_err(dev, "Failed to enable VDD33 supply\n"); 258 return ret; 259 } 260 ret = regulator_enable(exynos->vdd10); 261 if (ret) { 262 dev_err(dev, "Failed to enable VDD10 supply\n"); 263 return ret; 264 } 265 266 clk_enable(exynos->clk); 267 clk_enable(exynos->axius_clk); 268 269 /* runtime set active to reflect active state. */ 270 pm_runtime_disable(dev); 271 pm_runtime_set_active(dev); 272 pm_runtime_enable(dev); 273 274 return 0; 275 } 276 277 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = { 278 SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume) 279 }; 280 281 #define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops) 282 #else 283 #define DEV_PM_OPS NULL 284 #endif /* CONFIG_PM_SLEEP */ 285 286 static struct platform_driver dwc3_exynos_driver = { 287 .probe = dwc3_exynos_probe, 288 .remove = dwc3_exynos_remove, 289 .driver = { 290 .name = "exynos-dwc3", 291 .of_match_table = exynos_dwc3_match, 292 .pm = DEV_PM_OPS, 293 }, 294 }; 295 296 module_platform_driver(dwc3_exynos_driver); 297 298 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>"); 299 MODULE_LICENSE("GPL v2"); 300 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer"); 301