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/kernel.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19
  20 #include "core.h"
  21 #include "gadget-export.h"
  22 #include "drd.h"
  23
  24 static int set_phy_power_on(struct cdns *cdns)
  25 {
  26         int ret;
  27
  28         ret = phy_power_on(cdns->usb2_phy);
  29         if (ret)
  30                 return ret;
  31
  32         ret = phy_power_on(cdns->usb3_phy);
  33         if (ret)
  34                 phy_power_off(cdns->usb2_phy);
  35
  36         return ret;
  37 }
  38
  39 static void set_phy_power_off(struct cdns *cdns)
  40 {
  41         phy_power_off(cdns->usb3_phy);
  42         phy_power_off(cdns->usb2_phy);
  43 }
  44
  45 /**
  46  * cdns3_plat_probe - probe for cdns3 core device
  47  * @pdev: Pointer to cdns3 core platform device
  48  *
  49  * Returns 0 on success otherwise negative errno
  50  */
  51 static int cdns3_plat_probe(struct platform_device *pdev)
  52 {
  53         struct device *dev = &pdev->dev;
  54         struct resource *res;
  55         struct cdns *cdns;
  56         void __iomem *regs;
  57         int ret;
  58
  59         cdns = devm_kzalloc(dev, sizeof(*cdns), GFP_KERNEL);
  60         if (!cdns)
  61                 return -ENOMEM;
  62
  63         cdns->dev = dev;
  64         cdns->pdata = dev_get_platdata(dev);
  65
  66         platform_set_drvdata(pdev, cdns);
  67
  68         res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "host");
  69         if (!res) {
  70                 dev_err(dev, "missing host IRQ\n");
  71                 return -ENODEV;
  72         }
  73
  74         cdns->xhci_res[0] = *res;
  75
  76         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
  77         if (!res) {
  78                 dev_err(dev, "couldn't get xhci resource\n");
  79                 return -ENXIO;
  80         }
  81
  82         cdns->xhci_res[1] = *res;
  83
  84         cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");
  85
  86         if (cdns->dev_irq < 0)
  87                 return cdns->dev_irq;
  88
  89         regs = devm_platform_ioremap_resource_byname(pdev, "dev");
  90         if (IS_ERR(regs))
  91                 return PTR_ERR(regs);
  92         cdns->dev_regs  = regs;
  93
  94         cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
  95         if (cdns->otg_irq < 0)
  96                 return cdns->otg_irq;
  97
  98         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
  99         if (!res) {
 100                 dev_err(dev, "couldn't get otg resource\n");
 101                 return -ENXIO;
 102         }
 103
 104         cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");
 105
 106         cdns->otg_res = *res;
 107
 108         cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
 109         if (cdns->wakeup_irq == -EPROBE_DEFER)
 110                 return cdns->wakeup_irq;
 111         else if (cdns->wakeup_irq == 0)
 112                 return -EINVAL;
 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 int 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         return 0;
 191 }
 192
 193 #ifdef CONFIG_PM
 194
 195 static int cdns3_set_platform_suspend(struct device *dev,
 196                                       bool suspend, bool wakeup)
 197 {
 198         struct cdns *cdns = dev_get_drvdata(dev);
 199         int ret = 0;
 200
 201         if (cdns->pdata && cdns->pdata->platform_suspend)
 202                 ret = cdns->pdata->platform_suspend(dev, suspend, wakeup);
 203
 204         return ret;
 205 }
 206
 207 static int cdns3_controller_suspend(struct device *dev, pm_message_t msg)
 208 {
 209         struct cdns *cdns = dev_get_drvdata(dev);
 210         bool wakeup;
 211         unsigned long flags;
 212
 213         if (cdns->in_lpm)
 214                 return 0;
 215
 216         if (PMSG_IS_AUTO(msg))
 217                 wakeup = true;
 218         else
 219                 wakeup = device_may_wakeup(dev);
 220
 221         cdns3_set_platform_suspend(cdns->dev, true, wakeup);
 222         set_phy_power_off(cdns);
 223         spin_lock_irqsave(&cdns->lock, flags);
 224         cdns->in_lpm = true;
 225         spin_unlock_irqrestore(&cdns->lock, flags);
 226         dev_dbg(cdns->dev, "%s ends\n", __func__);
 227
 228         return 0;
 229 }
 230
 231 static int cdns3_controller_resume(struct device *dev, pm_message_t msg)
 232 {
 233         struct cdns *cdns = dev_get_drvdata(dev);
 234         int ret;
 235         unsigned long flags;
 236
 237         if (!cdns->in_lpm)
 238                 return 0;
 239
 240         if (cdns_power_is_lost(cdns)) {
 241                 phy_exit(cdns->usb2_phy);
 242                 ret = phy_init(cdns->usb2_phy);
 243                 if (ret)
 244                         return ret;
 245
 246                 phy_exit(cdns->usb3_phy);
 247                 ret = phy_init(cdns->usb3_phy);
 248                 if (ret)
 249                         return ret;
 250         }
 251
 252         ret = set_phy_power_on(cdns);
 253         if (ret)
 254                 return ret;
 255
 256         cdns3_set_platform_suspend(cdns->dev, false, false);
 257
 258         spin_lock_irqsave(&cdns->lock, flags);
 259         cdns_resume(cdns, !PMSG_IS_AUTO(msg));
 260         cdns->in_lpm = false;
 261         spin_unlock_irqrestore(&cdns->lock, flags);
 262         if (cdns->wakeup_pending) {
 263                 cdns->wakeup_pending = false;
 264                 enable_irq(cdns->wakeup_irq);
 265         }
 266         dev_dbg(cdns->dev, "%s ends\n", __func__);
 267
 268         return ret;
 269 }
 270
 271 static int cdns3_plat_runtime_suspend(struct device *dev)
 272 {
 273         return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
 274 }
 275
 276 static int cdns3_plat_runtime_resume(struct device *dev)
 277 {
 278         return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
 279 }
 280
 281 #ifdef CONFIG_PM_SLEEP
 282
 283 static int cdns3_plat_suspend(struct device *dev)
 284 {
 285         struct cdns *cdns = dev_get_drvdata(dev);
 286         int ret;
 287
 288         cdns_suspend(cdns);
 289
 290         ret = cdns3_controller_suspend(dev, PMSG_SUSPEND);
 291         if (ret)
 292                 return ret;
 293
 294         if (device_may_wakeup(dev) && cdns->wakeup_irq)
 295                 enable_irq_wake(cdns->wakeup_irq);
 296
 297         return ret;
 298 }
 299
 300 static int cdns3_plat_resume(struct device *dev)
 301 {
 302         return cdns3_controller_resume(dev, PMSG_RESUME);
 303 }
 304 #endif /* CONFIG_PM_SLEEP */
 305 #endif /* CONFIG_PM */
 306
 307 static const struct dev_pm_ops cdns3_pm_ops = {
 308         SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume)
 309         SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend,
 310                            cdns3_plat_runtime_resume, NULL)
 311 };
 312
 313 #ifdef CONFIG_OF
 314 static const struct of_device_id of_cdns3_match[] = {
 315         { .compatible = "cdns,usb3" },
 316         { },
 317 };
 318 MODULE_DEVICE_TABLE(of, of_cdns3_match);
 319 #endif
 320
 321 static struct platform_driver cdns3_driver = {
 322         .probe          = cdns3_plat_probe,
 323         .remove         = cdns3_plat_remove,
 324         .driver         = {
 325                 .name   = "cdns-usb3",
 326                 .of_match_table = of_match_ptr(of_cdns3_match),
 327                 .pm     = &cdns3_pm_ops,
 328         },
 329 };
 330
 331 module_platform_driver(cdns3_driver);
 332
 333 MODULE_ALIAS("platform:cdns3");
 334 MODULE_AUTHOR("Pawel Laszczak <[email protected]>");
 335 MODULE_LICENSE("GPL v2");
 336 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");