drivers/usb/cdns3/cdns3-plat.c

   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 <[email protected]>
  11  *         Pawel Laszczak <[email protected]>
  12  *         Roger Quadros <[email protected]>
  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         else if (cdns->wakeup_irq == 0)
 114                 return -EINVAL;
 115
 116         if (cdns->wakeup_irq < 0) {
 117                 dev_dbg(dev, "couldn't get wakeup irq\n");
 118                 cdns->wakeup_irq = 0x0;
 119         }
 120
 121         cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
 122         if (IS_ERR(cdns->usb2_phy))
 123                 return PTR_ERR(cdns->usb2_phy);
 124
 125         ret = phy_init(cdns->usb2_phy);
 126         if (ret)
 127                 return ret;
 128
 129         cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
 130         if (IS_ERR(cdns->usb3_phy))
 131                 return PTR_ERR(cdns->usb3_phy);
 132
 133         ret = phy_init(cdns->usb3_phy);
 134         if (ret)
 135                 goto err_phy3_init;
 136
 137         ret = set_phy_power_on(cdns);
 138         if (ret)
 139                 goto err_phy_power_on;
 140
 141         cdns->gadget_init = cdns3_gadget_init;
 142
 143         ret = cdns_init(cdns);
 144         if (ret)
 145                 goto err_cdns_init;
 146
 147         device_set_wakeup_capable(dev, true);
 148         pm_runtime_set_active(dev);
 149         pm_runtime_enable(dev);
 150         if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
 151                 pm_runtime_forbid(dev);
 152
 153         /*
 154          * The controller needs less time between bus and controller suspend,
 155          * and we also needs a small delay to avoid frequently entering low
 156          * power mode.
 157          */
 158         pm_runtime_set_autosuspend_delay(dev, 20);
 159         pm_runtime_mark_last_busy(dev);
 160         pm_runtime_use_autosuspend(dev);
 161
 162         return 0;
 163
 164 err_cdns_init:
 165         set_phy_power_off(cdns);
 166 err_phy_power_on:
 167         phy_exit(cdns->usb3_phy);
 168 err_phy3_init:
 169         phy_exit(cdns->usb2_phy);
 170
 171         return ret;
 172 }
 173
 174 /**
 175  * cdns3_plat_remove() - unbind drd driver and clean up
 176  * @pdev: Pointer to Linux platform device
 177  *
 178  * Returns 0 on success otherwise negative errno
 179  */
 180 static int cdns3_plat_remove(struct platform_device *pdev)
 181 {
 182         struct cdns *cdns = platform_get_drvdata(pdev);
 183         struct device *dev = cdns->dev;
 184
 185         pm_runtime_get_sync(dev);
 186         pm_runtime_disable(dev);
 187         pm_runtime_put_noidle(dev);
 188         cdns_remove(cdns);
 189         set_phy_power_off(cdns);
 190         phy_exit(cdns->usb2_phy);
 191         phy_exit(cdns->usb3_phy);
 192         return 0;
 193 }
 194
 195 #ifdef CONFIG_PM
 196
 197 static int cdns3_set_platform_suspend(struct device *dev,
 198                                       bool suspend, bool wakeup)
 199 {
 200         struct cdns *cdns = dev_get_drvdata(dev);
 201         int ret = 0;
 202
 203         if (cdns->pdata && cdns->pdata->platform_suspend)
 204                 ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);
 205
 206         return ret;
 207 }
 208
 209 static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
 210 {
 211         struct cdns *cdns = dev_get_drvdata(dev);
 212         bool wakeup;
 213         unsigned long flags;
 214
 215         if (cdns->in_lpm)
 216                 return 0;
 217
 218         if (PMSG_IS_AUTO(msg))
 219                 wakeup = true;
 220         else
 221                 wakeup = device_may_wakeup(dev);
 222
 223         cdns3_set_platform_suspend(cdns->dev, true, wakeup);
 224         set_phy_power_off(cdns);
 225         spin_lock_irqsave(&cdns->lock, flags);
 226         cdns->in_lpm = true;
 227         spin_unlock_irqrestore(&cdns->lock, flags);
 228         dev_dbg(cdns->dev, "%s ends\n", __func__);
 229
 230         return 0;
 231 }
 232
 233 static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
 234 {
 235         struct cdns *cdns = dev_get_drvdata(dev);
 236         int ret;
 237         unsigned long flags;
 238
 239         if (!cdns->in_lpm)
 240                 return 0;
 241
 242         if (cdns_power_is_lost(cdns)) {
 243                 phy_exit(cdns->usb2_phy);
 244                 ret = phy_init(cdns->usb2_phy);
 245                 if (ret)
 246                         return ret;
 247
 248                 phy_exit(cdns->usb3_phy);
 249                 ret = phy_init(cdns->usb3_phy);
 250                 if (ret)
 251                         return ret;
 252         }
 253
 254         ret = set_phy_power_on(cdns);
 255         if (ret)
 256                 return ret;
 257
 258         cdns3_set_platform_suspend(cdns->dev, false, false);
 259
 260         spin_lock_irqsave(&cdns->lock, flags);
 261         cdns_resume(cdns, !PMSG_IS_AUTO(msg));
 262         cdns->in_lpm = false;
 263         spin_unlock_irqrestore(&cdns->lock, flags);
 264         if (cdns->wakeup_pending) {
 265                 cdns->wakeup_pending = false;
 266                 enable_irq(cdns->wakeup_irq);
 267         }
 268         dev_dbg(cdns->dev, "%s ends\n", __func__);
 269
 270         return ret;
 271 }
 272
 273 static int cdns3_plat_runtime_suspend(struct device *dev)
 274 {
 275         return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
 276 }
 277
 278 static int cdns3_plat_runtime_resume(struct device *dev)
 279 {
 280         return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
 281 }
 282
 283 #ifdef CONFIG_PM_SLEEP
 284
 285 static int cdns3_plat_suspend(struct device *dev)
 286 {
 287         struct cdns *cdns = dev_get_drvdata(dev);
 288         int ret;
 289
 290         cdns_suspend(cdns);
 291
 292         ret = cdns3_controller_suspend(dev, PMSG_SUSPEND);
 293         if (ret)
 294                 return ret;
 295
 296         if (device_may_wakeup(dev) && cdns->wakeup_irq)
 297                 enable_irq_wake(cdns->wakeup_irq);
 298
 299         return ret;
 300 }
 301
 302 static int cdns3_plat_resume(struct device *dev)
 303 {
 304         return cdns3_controller_resume(dev, PMSG_RESUME);
 305 }
 306 #endif /* CONFIG_PM_SLEEP */
 307 #endif /* CONFIG_PM */
 308
 309 static const struct dev_pm_ops cdns3_pm_ops = {
 310         SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume)
 311         SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend,
 312                            cdns3_plat_runtime_resume, NULL)
 313 };
 314
 315 #ifdef CONFIG_OF
 316 static const struct of_device_id of_cdns3_match[] = {
 317         { .compatible = "cdns,usb3" },
 318         { },
 319 };
 320 MODULE_DEVICE_TABLE(of, of_cdns3_match);
 321 #endif
 322
 323 static struct platform_driver cdns3_driver = {
 324         .probe          = cdns3_plat_probe,
 325         .remove         = cdns3_plat_remove,
 326         .driver         = {
 327                 .name   = "cdns-usb3",
 328                 .of_match_table = of_match_ptr(of_cdns3_match),
 329                 .pm     = &cdns3_pm_ops,
 330         },
 331 };
 332
 333 module_platform_driver(cdns3_driver);
 334
 335 MODULE_ALIAS("platform:cdns3");
 336 MODULE_AUTHOR("Pawel Laszczak <[email protected]>");
 337 MODULE_LICENSE("GPL v2");
 338 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");