drivers/usb/host/ehci-platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic platform ehci driver
   4  *
   5  * Copyright 2007 Steven Brown <sbrown@cortland.com>
   6  * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
   7  * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
   8  *
   9  * Derived from the ohci-ssb driver
  10  * Copyright 2007 Michael Buesch <m@bues.ch>
  11  *
  12  * Derived from the EHCI-PCI driver
  13  * Copyright (c) 2000-2004 by David Brownell
  14  *
  15  * Derived from the ohci-pci driver
  16  * Copyright 1999 Roman Weissgaerber
  17  * Copyright 2000-2002 David Brownell
  18  * Copyright 1999 Linus Torvalds
  19  * Copyright 1999 Gregory P. Smith
  20  */
  21 #include <linux/acpi.h>
  22 #include <linux/clk.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/err.h>
  25 #include <linux/kernel.h>
  26 #include <linux/hrtimer.h>
  27 #include <linux/io.h>
  28 #include <linux/module.h>
  29 #include <linux/of.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/reset.h>
  32 #include <linux/usb.h>
  33 #include <linux/usb/hcd.h>
  34 #include <linux/usb/ehci_pdriver.h>
  35 #include <linux/usb/of.h>
  36
  37 #include "ehci.h"
  38
  39 #define DRIVER_DESC "EHCI generic platform driver"
  40 #define EHCI_MAX_CLKS 4
  41 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
  42
  43 struct ehci_platform_priv {
  44         struct clk *clks[EHCI_MAX_CLKS];
  45         struct reset_control *rsts;
  46         bool reset_on_resume;
  47 };
  48
  49 static const char hcd_name[] = "ehci-platform";
  50
  51 static int ehci_platform_reset(struct usb_hcd *hcd)
  52 {
  53         struct platform_device *pdev = to_platform_device(hcd->self.controller);
  54         struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
  55         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  56         int retval;
  57
  58         ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
  59
  60         if (pdata->pre_setup) {
  61                 retval = pdata->pre_setup(hcd);
  62                 if (retval < 0)
  63                         return retval;
  64         }
  65
  66         ehci->caps = hcd->regs + pdata->caps_offset;
  67         retval = ehci_setup(hcd);
  68         if (retval)
  69                 return retval;
  70
  71         if (pdata->no_io_watchdog)
  72                 ehci->need_io_watchdog = 0;
  73         return 0;
  74 }
  75
  76 static int ehci_platform_power_on(struct platform_device *dev)
  77 {
  78         struct usb_hcd *hcd = platform_get_drvdata(dev);
  79         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
  80         int clk, ret;
  81
  82         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
  83                 ret = clk_prepare_enable(priv->clks[clk]);
  84                 if (ret)
  85                         goto err_disable_clks;
  86         }
  87
  88         return 0;
  89
  90 err_disable_clks:
  91         while (--clk >= 0)
  92                 clk_disable_unprepare(priv->clks[clk]);
  93
  94         return ret;
  95 }
  96
  97 static void ehci_platform_power_off(struct platform_device *dev)
  98 {
  99         struct usb_hcd *hcd = platform_get_drvdata(dev);
 100         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 101         int clk;
 102
 103         for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
 104                 if (priv->clks[clk])
 105                         clk_disable_unprepare(priv->clks[clk]);
 106 }
 107
 108 static struct hc_driver __read_mostly ehci_platform_hc_driver;
 109
 110 static const struct ehci_driver_overrides platform_overrides __initconst = {
 111         .reset =                ehci_platform_reset,
 112         .extra_priv_size =      sizeof(struct ehci_platform_priv),
 113 };
 114
 115 static struct usb_ehci_pdata ehci_platform_defaults = {
 116         .power_on =             ehci_platform_power_on,
 117         .power_suspend =        ehci_platform_power_off,
 118         .power_off =            ehci_platform_power_off,
 119 };
 120
 121 static int ehci_platform_probe(struct platform_device *dev)
 122 {
 123         struct usb_hcd *hcd;
 124         struct resource *res_mem;
 125         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 126         struct ehci_platform_priv *priv;
 127         struct ehci_hcd *ehci;
 128         int err, irq, clk = 0;
 129
 130         if (usb_disabled())
 131                 return -ENODEV;
 132
 133         /*
 134          * Use reasonable defaults so platforms don't have to provide these
 135          * with DT probing on ARM.
 136          */
 137         if (!pdata)
 138                 pdata = &ehci_platform_defaults;
 139
 140         err = dma_coerce_mask_and_coherent(&dev->dev,
 141                 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
 142         if (err) {
 143                 dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
 144                 return err;
 145         }
 146
 147         irq = platform_get_irq(dev, 0);
 148         if (irq < 0) {
 149                 dev_err(&dev->dev, "no irq provided");
 150                 return irq;
 151         }
 152
 153         hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 154                              dev_name(&dev->dev));
 155         if (!hcd)
 156                 return -ENOMEM;
 157
 158         platform_set_drvdata(dev, hcd);
 159         dev->dev.platform_data = pdata;
 160         priv = hcd_to_ehci_priv(hcd);
 161         ehci = hcd_to_ehci(hcd);
 162
 163         if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
 164                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
 165                         ehci->big_endian_mmio = 1;
 166
 167                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
 168                         ehci->big_endian_desc = 1;
 169
 170                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
 171                         ehci->big_endian_mmio = ehci->big_endian_desc = 1;
 172
 173                 if (of_property_read_bool(dev->dev.of_node,
 174                                           "needs-reset-on-resume"))
 175                         priv->reset_on_resume = true;
 176
 177                 if (of_property_read_bool(dev->dev.of_node,
 178                                           "has-transaction-translator"))
 179                         hcd->has_tt = 1;
 180
 181                 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
 182                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 183                         if (IS_ERR(priv->clks[clk])) {
 184                                 err = PTR_ERR(priv->clks[clk]);
 185                                 if (err == -EPROBE_DEFER)
 186                                         goto err_put_clks;
 187                                 priv->clks[clk] = NULL;
 188                                 break;
 189                         }
 190                 }
 191         }
 192
 193         priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev);
 194         if (IS_ERR(priv->rsts)) {
 195                 err = PTR_ERR(priv->rsts);
 196                 goto err_put_clks;
 197         }
 198
 199         err = reset_control_deassert(priv->rsts);
 200         if (err)
 201                 goto err_put_clks;
 202
 203         if (pdata->big_endian_desc)
 204                 ehci->big_endian_desc = 1;
 205         if (pdata->big_endian_mmio)
 206                 ehci->big_endian_mmio = 1;
 207         if (pdata->has_tt)
 208                 hcd->has_tt = 1;
 209         if (pdata->reset_on_resume)
 210                 priv->reset_on_resume = true;
 211
 212 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 213         if (ehci->big_endian_mmio) {
 214                 dev_err(&dev->dev,
 215                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
 216                 err = -EINVAL;
 217                 goto err_reset;
 218         }
 219 #endif
 220 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 221         if (ehci->big_endian_desc) {
 222                 dev_err(&dev->dev,
 223                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
 224                 err = -EINVAL;
 225                 goto err_reset;
 226         }
 227 #endif
 228
 229         if (pdata->power_on) {
 230                 err = pdata->power_on(dev);
 231                 if (err < 0)
 232                         goto err_reset;
 233         }
 234
 235         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 236         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 237         if (IS_ERR(hcd->regs)) {
 238                 err = PTR_ERR(hcd->regs);
 239                 goto err_power;
 240         }
 241         hcd->rsrc_start = res_mem->start;
 242         hcd->rsrc_len = resource_size(res_mem);
 243
 244         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 245         if (err)
 246                 goto err_power;
 247
 248         device_wakeup_enable(hcd->self.controller);
 249         device_enable_async_suspend(hcd->self.controller);
 250         platform_set_drvdata(dev, hcd);
 251
 252         return err;
 253
 254 err_power:
 255         if (pdata->power_off)
 256                 pdata->power_off(dev);
 257 err_reset:
 258         reset_control_assert(priv->rsts);
 259 err_put_clks:
 260         while (--clk >= 0)
 261                 clk_put(priv->clks[clk]);
 262
 263         if (pdata == &ehci_platform_defaults)
 264                 dev->dev.platform_data = NULL;
 265
 266         usb_put_hcd(hcd);
 267
 268         return err;
 269 }
 270
 271 static int ehci_platform_remove(struct platform_device *dev)
 272 {
 273         struct usb_hcd *hcd = platform_get_drvdata(dev);
 274         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 275         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 276         int clk;
 277
 278         usb_remove_hcd(hcd);
 279
 280         if (pdata->power_off)
 281                 pdata->power_off(dev);
 282
 283         reset_control_assert(priv->rsts);
 284
 285         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 286                 clk_put(priv->clks[clk]);
 287
 288         usb_put_hcd(hcd);
 289
 290         if (pdata == &ehci_platform_defaults)
 291                 dev->dev.platform_data = NULL;
 292
 293         return 0;
 294 }
 295
 296 #ifdef CONFIG_PM_SLEEP
 297 static int ehci_platform_suspend(struct device *dev)
 298 {
 299         struct usb_hcd *hcd = dev_get_drvdata(dev);
 300         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
 301         struct platform_device *pdev = to_platform_device(dev);
 302         bool do_wakeup = device_may_wakeup(dev);
 303         int ret;
 304
 305         ret = ehci_suspend(hcd, do_wakeup);
 306         if (ret)
 307                 return ret;
 308
 309         if (pdata->power_suspend)
 310                 pdata->power_suspend(pdev);
 311
 312         return ret;
 313 }
 314
 315 static int ehci_platform_resume(struct device *dev)
 316 {
 317         struct usb_hcd *hcd = dev_get_drvdata(dev);
 318         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
 319         struct platform_device *pdev = to_platform_device(dev);
 320         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 321         struct device *companion_dev;
 322
 323         if (pdata->power_on) {
 324                 int err = pdata->power_on(pdev);
 325                 if (err < 0)
 326                         return err;
 327         }
 328
 329         companion_dev = usb_of_get_companion_dev(hcd->self.controller);
 330         if (companion_dev) {
 331                 device_pm_wait_for_dev(hcd->self.controller, companion_dev);
 332                 put_device(companion_dev);
 333         }
 334
 335         ehci_resume(hcd, priv->reset_on_resume);
 336         return 0;
 337 }
 338 #endif /* CONFIG_PM_SLEEP */
 339
 340 static const struct of_device_id vt8500_ehci_ids[] = {
 341         { .compatible = "via,vt8500-ehci", },
 342         { .compatible = "wm,prizm-ehci", },
 343         { .compatible = "generic-ehci", },
 344         { .compatible = "cavium,octeon-6335-ehci", },
 345         {}
 346 };
 347 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
 348
 349 static const struct acpi_device_id ehci_acpi_match[] = {
 350         { "PNP0D20", 0 }, /* EHCI controller without debug */
 351         { }
 352 };
 353 MODULE_DEVICE_TABLE(acpi, ehci_acpi_match);
 354
 355 static const struct platform_device_id ehci_platform_table[] = {
 356         { "ehci-platform", 0 },
 357         { }
 358 };
 359 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
 360
 361 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
 362         ehci_platform_resume);
 363
 364 static struct platform_driver ehci_platform_driver = {
 365         .id_table       = ehci_platform_table,
 366         .probe          = ehci_platform_probe,
 367         .remove         = ehci_platform_remove,
 368         .shutdown       = usb_hcd_platform_shutdown,
 369         .driver         = {
 370                 .name   = "ehci-platform",
 371                 .pm     = &ehci_platform_pm_ops,
 372                 .of_match_table = vt8500_ehci_ids,
 373                 .acpi_match_table = ACPI_PTR(ehci_acpi_match),
 374         }
 375 };
 376
 377 static int __init ehci_platform_init(void)
 378 {
 379         if (usb_disabled())
 380                 return -ENODEV;
 381
 382         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 383
 384         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
 385         return platform_driver_register(&ehci_platform_driver);
 386 }
 387 module_init(ehci_platform_init);
 388
 389 static void __exit ehci_platform_cleanup(void)
 390 {
 391         platform_driver_unregister(&ehci_platform_driver);
 392 }
 393 module_exit(ehci_platform_cleanup);
 394
 395 MODULE_DESCRIPTION(DRIVER_DESC);
 396 MODULE_AUTHOR("Hauke Mehrtens");
 397 MODULE_AUTHOR("Alan Stern");
 398 MODULE_LICENSE("GPL");