1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Cadence USBSS DRD Driver. 4 * 5 * Copyright (C) 2018-2020 Cadence. 6 * Copyright (C) 2017-2018 NXP 7 * Copyright (C) 2019 Texas Instruments 8 * 9 * 10 * Author: Peter Chen <peter.chen@nxp.com> 11 * Pawel Laszczak <pawell@cadence.com> 12 * Roger Quadros <rogerq@ti.com> 13 */ 14 15 #include <linux/module.h> 16 #include <linux/irq.h> 17 #include <linux/kernel.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/pm_runtime.h> 21 22 #include "core.h" 23 #include "gadget-export.h" 24 #include "drd.h" 25 26 static int set_phy_power_on(struct cdns *cdns) 27 { 28 int ret; 29 30 ret = phy_power_on(cdns->usb2_phy); 31 if (ret) 32 return ret; 33 34 ret = phy_power_on(cdns->usb3_phy); 35 if (ret) 36 phy_power_off(cdns->usb2_phy); 37 38 return ret; 39 } 40 41 static void set_phy_power_off(struct cdns *cdns) 42 { 43 phy_power_off(cdns->usb3_phy); 44 phy_power_off(cdns->usb2_phy); 45 } 46 47 /** 48 * cdns3_plat_probe - probe for cdns3 core device 49 * @pdev: Pointer to cdns3 core platform device 50 * 51 * Returns 0 on success otherwise negative errno 52 */ 53 static int cdns3_plat_probe(struct platform_device *pdev) 54 { 55 struct device *dev = &pdev->dev; 56 struct resource *res; 57 struct cdns *cdns; 58 void __iomem *regs; 59 int ret; 60 61 cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL); 62 if (!cdns) 63 return -ENOMEM; 64 65 cdns->dev = dev; 66 cdns->pdata = dev_get_platdata(dev); 67 68 platform_set_drvdata(pdev, cdns); 69 70 ret = platform_get_irq_byname(pdev, "host"); 71 if (ret < 0) 72 return ret; 73 74 cdns->xhci_res[0].start = ret; 75 cdns->xhci_res[0].end = ret; 76 cdns->xhci_res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(ret); 77 cdns->xhci_res[0].name = "host"; 78 79 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci"); 80 if (!res) { 81 dev_err(dev, "couldn't get xhci resource\n"); 82 return -ENXIO; 83 } 84 85 cdns->xhci_res[1] = *res; 86 87 cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral"); 88 89 if (cdns->dev_irq < 0) 90 return dev_err_probe(dev, cdns->dev_irq, 91 "Failed to get peripheral IRQ\n"); 92 93 regs = devm_platform_ioremap_resource_byname(pdev, "dev"); 94 if (IS_ERR(regs)) 95 return dev_err_probe(dev, PTR_ERR(regs), 96 "Failed to get dev base\n"); 97 98 cdns->dev_regs = regs; 99 100 cdns->otg_irq = platform_get_irq_byname(pdev, "otg"); 101 if (cdns->otg_irq < 0) 102 return dev_err_probe(dev, cdns->otg_irq, 103 "Failed to get otg IRQ\n"); 104 105 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg"); 106 if (!res) { 107 dev_err(dev, "couldn't get otg resource\n"); 108 return -ENXIO; 109 } 110 111 cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable"); 112 113 cdns->otg_res = *res; 114 115 cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup"); 116 if (cdns->wakeup_irq == -EPROBE_DEFER) 117 return cdns->wakeup_irq; 118 119 if (cdns->wakeup_irq < 0) { 120 dev_dbg(dev, "couldn't get wakeup irq\n"); 121 cdns->wakeup_irq = 0x0; 122 } 123 124 cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy"); 125 if (IS_ERR(cdns->usb2_phy)) 126 return dev_err_probe(dev, PTR_ERR(cdns->usb2_phy), 127 "Failed to get cdn3,usb2-phy\n"); 128 129 ret = phy_init(cdns->usb2_phy); 130 if (ret) 131 return ret; 132 133 cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy"); 134 if (IS_ERR(cdns->usb3_phy)) 135 return dev_err_probe(dev, PTR_ERR(cdns->usb3_phy), 136 "Failed to get cdn3,usb3-phy\n"); 137 138 ret = phy_init(cdns->usb3_phy); 139 if (ret) 140 goto err_phy3_init; 141 142 ret = set_phy_power_on(cdns); 143 if (ret) 144 goto err_phy_power_on; 145 146 cdns->gadget_init = cdns3_gadget_init; 147 148 ret = cdns_init(cdns); 149 if (ret) 150 goto err_cdns_init; 151 152 device_set_wakeup_capable(dev, true); 153 pm_runtime_set_active(dev); 154 pm_runtime_enable(dev); 155 if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))) 156 pm_runtime_forbid(dev); 157 158 /* 159 * The controller needs less time between bus and controller suspend, 160 * and we also needs a small delay to avoid frequently entering low 161 * power mode. 162 */ 163 pm_runtime_set_autosuspend_delay(dev, 20); 164 pm_runtime_mark_last_busy(dev); 165 pm_runtime_use_autosuspend(dev); 166 167 return 0; 168 169 err_cdns_init: 170 set_phy_power_off(cdns); 171 err_phy_power_on: 172 phy_exit(cdns->usb3_phy); 173 err_phy3_init: 174 phy_exit(cdns->usb2_phy); 175 176 return ret; 177 } 178 179 /** 180 * cdns3_plat_remove() - unbind drd driver and clean up 181 * @pdev: Pointer to Linux platform device 182 */ 183 static void cdns3_plat_remove(struct platform_device *pdev) 184 { 185 struct cdns *cdns = platform_get_drvdata(pdev); 186 struct device *dev = cdns->dev; 187 188 pm_runtime_get_sync(dev); 189 pm_runtime_disable(dev); 190 pm_runtime_put_noidle(dev); 191 cdns_remove(cdns); 192 set_phy_power_off(cdns); 193 phy_exit(cdns->usb2_phy); 194 phy_exit(cdns->usb3_phy); 195 } 196 197 #ifdef CONFIG_PM 198 199 static int cdns3_set_platform_suspend(struct device *dev, 200 bool suspend, bool wakeup) 201 { 202 struct cdns *cdns = dev_get_drvdata(dev); 203 int ret = 0; 204 205 if (cdns->pdata && cdns->pdata->platform_suspend) 206 ret = cdns->pdata->platform_suspend(dev, suspend, wakeup); 207 208 return ret; 209 } 210 211 static int cdns3_controller_suspend(struct device *dev, pm_message_t msg) 212 { 213 struct cdns *cdns = dev_get_drvdata(dev); 214 bool wakeup; 215 unsigned long flags; 216 217 if (cdns->in_lpm) 218 return 0; 219 220 if (PMSG_IS_AUTO(msg)) 221 wakeup = true; 222 else 223 wakeup = device_may_wakeup(dev); 224 225 cdns3_set_platform_suspend(cdns->dev, true, wakeup); 226 set_phy_power_off(cdns); 227 spin_lock_irqsave(&cdns->lock, flags); 228 cdns->in_lpm = true; 229 spin_unlock_irqrestore(&cdns->lock, flags); 230 dev_dbg(cdns->dev, "%s ends\n", __func__); 231 232 return 0; 233 } 234 235 static int cdns3_controller_resume(struct device *dev, pm_message_t msg) 236 { 237 struct cdns *cdns = dev_get_drvdata(dev); 238 int ret; 239 unsigned long flags; 240 241 if (!cdns->in_lpm) 242 return 0; 243 244 if (cdns_power_is_lost(cdns)) { 245 phy_exit(cdns->usb2_phy); 246 ret = phy_init(cdns->usb2_phy); 247 if (ret) 248 return ret; 249 250 phy_exit(cdns->usb3_phy); 251 ret = phy_init(cdns->usb3_phy); 252 if (ret) 253 return ret; 254 } 255 256 ret = set_phy_power_on(cdns); 257 if (ret) 258 return ret; 259 260 cdns3_set_platform_suspend(cdns->dev, false, false); 261 262 spin_lock_irqsave(&cdns->lock, flags); 263 cdns_resume(cdns); 264 cdns->in_lpm = false; 265 spin_unlock_irqrestore(&cdns->lock, flags); 266 cdns_set_active(cdns, !PMSG_IS_AUTO(msg)); 267 if (cdns->wakeup_pending) { 268 cdns->wakeup_pending = false; 269 enable_irq(cdns->wakeup_irq); 270 } 271 dev_dbg(cdns->dev, "%s ends\n", __func__); 272 273 return ret; 274 } 275 276 static int cdns3_plat_runtime_suspend(struct device *dev) 277 { 278 return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND); 279 } 280 281 static int cdns3_plat_runtime_resume(struct device *dev) 282 { 283 return cdns3_controller_resume(dev, PMSG_AUTO_RESUME); 284 } 285 286 #ifdef CONFIG_PM_SLEEP 287 288 static int cdns3_plat_suspend(struct device *dev) 289 { 290 struct cdns *cdns = dev_get_drvdata(dev); 291 int ret; 292 293 cdns_suspend(cdns); 294 295 ret = cdns3_controller_suspend(dev, PMSG_SUSPEND); 296 if (ret) 297 return ret; 298 299 if (device_may_wakeup(dev) && cdns->wakeup_irq) 300 enable_irq_wake(cdns->wakeup_irq); 301 302 return ret; 303 } 304 305 static int cdns3_plat_resume(struct device *dev) 306 { 307 return cdns3_controller_resume(dev, PMSG_RESUME); 308 } 309 #endif /* CONFIG_PM_SLEEP */ 310 #endif /* CONFIG_PM */ 311 312 static const struct dev_pm_ops cdns3_pm_ops = { 313 SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume) 314 SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend, 315 cdns3_plat_runtime_resume, NULL) 316 }; 317 318 #ifdef CONFIG_OF 319 static const struct of_device_id of_cdns3_match[] = { 320 { .compatible = "cdns,usb3" }, 321 { }, 322 }; 323 MODULE_DEVICE_TABLE(of, of_cdns3_match); 324 #endif 325 326 static struct platform_driver cdns3_driver = { 327 .probe = cdns3_plat_probe, 328 .remove = cdns3_plat_remove, 329 .driver = { 330 .name = "cdns-usb3", 331 .of_match_table = of_match_ptr(of_cdns3_match), 332 .pm = &cdns3_pm_ops, 333 }, 334 }; 335 336 module_platform_driver(cdns3_driver); 337 338 MODULE_ALIAS("platform:cdns3"); 339 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>"); 340 MODULE_LICENSE("GPL v2"); 341 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver"); 342