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