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 <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 cdns->dev_irq;
  91
  92         regs = devm_platform_ioremap_resource_byname(pdev, "dev");
  93         if (IS_ERR(regs))
  94                 return PTR_ERR(regs);
  95         cdns->dev_regs  = regs;
  96
  97         cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
  98         if (cdns->otg_irq < 0)
  99                 return cdns->otg_irq;
 100
 101         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
 102         if (!res) {
 103                 dev_err(dev, "couldn't get otg resource\n");
 104                 return -ENXIO;
 105         }
 106
 107         cdns->phyrst_a_enable = device_property_read_bool(dev, "cdns,phyrst-a-enable");
 108
 109         cdns->otg_res = *res;
 110
 111         cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
 112         if (cdns->wakeup_irq == -EPROBE_DEFER)
 113                 return cdns->wakeup_irq;
 114
 115         if (cdns->wakeup_irq < 0) {
 116                 dev_dbg(dev, "couldn't get wakeup irq\n");
 117                 cdns->wakeup_irq = 0x0;
 118         }
 119
 120         cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
 121         if (IS_ERR(cdns->usb2_phy))
 122                 return PTR_ERR(cdns->usb2_phy);
 123
 124         ret = phy_init(cdns->usb2_phy);
 125         if (ret)
 126                 return ret;
 127
 128         cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
 129         if (IS_ERR(cdns->usb3_phy))
 130                 return PTR_ERR(cdns->usb3_phy);
 131
 132         ret = phy_init(cdns->usb3_phy);
 133         if (ret)
 134                 goto err_phy3_init;
 135
 136         ret = set_phy_power_on(cdns);
 137         if (ret)
 138                 goto err_phy_power_on;
 139
 140         cdns->gadget_init = cdns3_gadget_init;
 141
 142         ret = cdns_init(cdns);
 143         if (ret)
 144                 goto err_cdns_init;
 145
 146         device_set_wakeup_capable(dev, true);
 147         pm_runtime_set_active(dev);
 148         pm_runtime_enable(dev);
 149         if (!(cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW)))
 150                 pm_runtime_forbid(dev);
 151
 152         /*
 153          * The controller needs less time between bus and controller suspend,
 154          * and we also needs a small delay to avoid frequently entering low
 155          * power mode.
 156          */
 157         pm_runtime_set_autosuspend_delay(dev, 20);
 158         pm_runtime_mark_last_busy(dev);
 159         pm_runtime_use_autosuspend(dev);
 160
 161         return 0;
 162
 163 err_cdns_init:
 164         set_phy_power_off(cdns);
 165 err_phy_power_on:
 166         phy_exit(cdns->usb3_phy);
 167 err_phy3_init:
 168         phy_exit(cdns->usb2_phy);
 169
 170         return ret;
 171 }
 172
 173 /**
 174  * cdns3_plat_remove() - unbind drd driver and clean up
 175  * @pdev: Pointer to Linux platform device
 176  *
 177  * Returns 0 on success otherwise negative errno
 178  */
 179 static void cdns3_plat_remove(struct platform_device *pdev)
 180 {
 181         struct cdns *cdns = platform_get_drvdata(pdev);
 182         struct device *dev = cdns->dev;
 183
 184         pm_runtime_get_sync(dev);
 185         pm_runtime_disable(dev);
 186         pm_runtime_put_noidle(dev);
 187         cdns_remove(cdns);
 188         set_phy_power_off(cdns);
 189         phy_exit(cdns->usb2_phy);
 190         phy_exit(cdns->usb3_phy);
 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);
 260         cdns->in_lpm = false;
 261         spin_unlock_irqrestore(&cdns->lock, flags);
 262         cdns_set_active(cdns, !PMSG_IS_AUTO(msg));
 263         if (cdns->wakeup_pending) {
 264                 cdns->wakeup_pending = false;
 265                 enable_irq(cdns->wakeup_irq);
 266         }
 267         dev_dbg(cdns->dev, "%s ends\n", __func__);
 268
 269         return ret;
 270 }
 271
 272 static int cdns3_plat_runtime_suspend(struct device *dev)
 273 {
 274         return cdns3_controller_suspend(dev, PMSG_AUTO_SUSPEND);
 275 }
 276
 277 static int cdns3_plat_runtime_resume(struct device *dev)
 278 {
 279         return cdns3_controller_resume(dev, PMSG_AUTO_RESUME);
 280 }
 281
 282 #ifdef CONFIG_PM_SLEEP
 283
 284 static int cdns3_plat_suspend(struct device *dev)
 285 {
 286         struct cdns *cdns = dev_get_drvdata(dev);
 287         int ret;
 288
 289         cdns_suspend(cdns);
 290
 291         ret = cdns3_controller_suspend(dev, PMSG_SUSPEND);
 292         if (ret)
 293                 return ret;
 294
 295         if (device_may_wakeup(dev) && cdns->wakeup_irq)
 296                 enable_irq_wake(cdns->wakeup_irq);
 297
 298         return ret;
 299 }
 300
 301 static int cdns3_plat_resume(struct device *dev)
 302 {
 303         return cdns3_controller_resume(dev, PMSG_RESUME);
 304 }
 305 #endif /* CONFIG_PM_SLEEP */
 306 #endif /* CONFIG_PM */
 307
 308 static const struct dev_pm_ops cdns3_pm_ops = {
 309         SET_SYSTEM_SLEEP_PM_OPS(cdns3_plat_suspend, cdns3_plat_resume)
 310         SET_RUNTIME_PM_OPS(cdns3_plat_runtime_suspend,
 311                            cdns3_plat_runtime_resume, NULL)
 312 };
 313
 314 #ifdef CONFIG_OF
 315 static const struct of_device_id of_cdns3_match[] = {
 316         { .compatible = "cdns,usb3" },
 317         { },
 318 };
 319 MODULE_DEVICE_TABLE(of, of_cdns3_match);
 320 #endif
 321
 322 static struct platform_driver cdns3_driver = {
 323         .probe          = cdns3_plat_probe,
 324         .remove_new     = cdns3_plat_remove,
 325         .driver         = {
 326                 .name   = "cdns-usb3",
 327                 .of_match_table = of_match_ptr(of_cdns3_match),
 328                 .pm     = &cdns3_pm_ops,
 329         },
 330 };
 331
 332 module_platform_driver(cdns3_driver);
 333
 334 MODULE_ALIAS("platform:cdns3");
 335 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
 336 MODULE_LICENSE("GPL v2");
 337 MODULE_DESCRIPTION("Cadence USB3 DRD Controller Driver");