kernel/drivers/usb/host/ehci-platform.c

   1 /*
   2  * Generic platform ehci driver
   3  *
   4  * Copyright 2007 Steven Brown <sbrown@cortland.com>
   5  * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
   6  * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
   7  *
   8  * Derived from the ohci-ssb driver
   9  * Copyright 2007 Michael Buesch <m@bues.ch>
  10  *
  11  * Derived from the EHCI-PCI driver
  12  * Copyright (c) 2000-2004 by David Brownell
  13  *
  14  * Derived from the ohci-pci driver
  15  * Copyright 1999 Roman Weissgaerber
  16  * Copyright 2000-2002 David Brownell
  17  * Copyright 1999 Linus Torvalds
  18  * Copyright 1999 Gregory P. Smith
  19  *
  20  * Licensed under the GNU/GPL. See COPYING for details.
  21  */
  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/phy/phy.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/reset.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/hcd.h>
  35 #include <linux/usb/ehci_pdriver.h>
  36
  37 #include "ehci.h"
  38
  39 #define DRIVER_DESC "EHCI generic platform driver"
  40 #define EHCI_MAX_CLKS 3
  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 *rst;
  46         struct phy **phys;
  47         int num_phys;
  48 };
  49
  50 static const char hcd_name[] = "ehci-platform";
  51
  52 static int ehci_platform_reset(struct usb_hcd *hcd)
  53 {
  54         struct platform_device *pdev = to_platform_device(hcd->self.controller);
  55         struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
  56         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  57         int retval;
  58
  59         hcd->has_tt = pdata->has_tt;
  60         ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
  61
  62         if (pdata->pre_setup) {
  63                 retval = pdata->pre_setup(hcd);
  64                 if (retval < 0)
  65                         return retval;
  66         }
  67
  68         ehci->caps = hcd->regs + pdata->caps_offset;
  69         retval = ehci_setup(hcd);
  70         if (retval)
  71                 return retval;
  72
  73         if (pdata->no_io_watchdog)
  74                 ehci->need_io_watchdog = 0;
  75         return 0;
  76 }
  77
  78 static int ehci_platform_power_on(struct platform_device *dev)
  79 {
  80         struct usb_hcd *hcd = platform_get_drvdata(dev);
  81         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
  82         int clk, ret, phy_num;
  83
  84         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
  85                 ret = clk_prepare_enable(priv->clks[clk]);
  86                 if (ret)
  87                         goto err_disable_clks;
  88         }
  89
  90         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
  91                 if (priv->phys[phy_num]) {
  92                         ret = phy_init(priv->phys[phy_num]);
  93                         if (ret)
  94                                 goto err_exit_phy;
  95                         ret = phy_power_on(priv->phys[phy_num]);
  96                         if (ret) {
  97                                 phy_exit(priv->phys[phy_num]);
  98                                 goto err_exit_phy;
  99                         }
 100                 }
 101         }
 102
 103         return 0;
 104
 105 err_exit_phy:
 106         while (--phy_num >= 0) {
 107                 if (priv->phys[phy_num]) {
 108                         phy_power_off(priv->phys[phy_num]);
 109                         phy_exit(priv->phys[phy_num]);
 110                 }
 111         }
 112 err_disable_clks:
 113         while (--clk >= 0)
 114                 clk_disable_unprepare(priv->clks[clk]);
 115
 116         return ret;
 117 }
 118
 119 static void ehci_platform_power_off(struct platform_device *dev)
 120 {
 121         struct usb_hcd *hcd = platform_get_drvdata(dev);
 122         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 123         int clk, phy_num;
 124
 125         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
 126                 if (priv->phys[phy_num]) {
 127                         phy_power_off(priv->phys[phy_num]);
 128                         phy_exit(priv->phys[phy_num]);
 129                 }
 130         }
 131
 132         for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
 133                 if (priv->clks[clk])
 134                         clk_disable_unprepare(priv->clks[clk]);
 135 }
 136
 137 static struct hc_driver __read_mostly ehci_platform_hc_driver;
 138
 139 static const struct ehci_driver_overrides platform_overrides __initconst = {
 140         .reset =                ehci_platform_reset,
 141         .extra_priv_size =      sizeof(struct ehci_platform_priv),
 142 };
 143
 144 static struct usb_ehci_pdata ehci_platform_defaults = {
 145         .power_on =             ehci_platform_power_on,
 146         .power_suspend =        ehci_platform_power_off,
 147         .power_off =            ehci_platform_power_off,
 148 };
 149
 150 static int ehci_platform_probe(struct platform_device *dev)
 151 {
 152         struct usb_hcd *hcd;
 153         struct resource *res_mem;
 154         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 155         struct ehci_platform_priv *priv;
 156         struct ehci_hcd *ehci;
 157         const char *phy_name;
 158         int err, irq, phy_num, clk = 0;
 159
 160         if (usb_disabled())
 161                 return -ENODEV;
 162
 163         /*
 164          * Use reasonable defaults so platforms don't have to provide these
 165          * with DT probing on ARM.
 166          */
 167         if (!pdata)
 168                 pdata = &ehci_platform_defaults;
 169
 170         err = dma_coerce_mask_and_coherent(&dev->dev,
 171                 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
 172         if (err)
 173                 return err;
 174
 175         irq = platform_get_irq(dev, 0);
 176         if (irq < 0) {
 177                 dev_err(&dev->dev, "no irq provided");
 178                 return irq;
 179         }
 180
 181         hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 182                              dev_name(&dev->dev));
 183         if (!hcd)
 184                 return -ENOMEM;
 185
 186         platform_set_drvdata(dev, hcd);
 187         dev->dev.platform_data = pdata;
 188         priv = hcd_to_ehci_priv(hcd);
 189         ehci = hcd_to_ehci(hcd);
 190
 191         if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
 192                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
 193                         ehci->big_endian_mmio = 1;
 194
 195                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
 196                         ehci->big_endian_desc = 1;
 197
 198                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
 199                         ehci->big_endian_mmio = ehci->big_endian_desc = 1;
 200
 201                 if (of_property_read_bool(dev->dev.of_node,
 202                                           "needs-reset-on-resume"))
 203                         pdata->reset_on_resume = 1;
 204
 205                 priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
 206                                 "phys", "#phy-cells");
 207                 priv->num_phys = priv->num_phys > 0 ? priv->num_phys : 1;
 208
 209                 priv->phys = devm_kcalloc(&dev->dev, priv->num_phys,
 210                                 sizeof(struct phy *), GFP_KERNEL);
 211                 if (!priv->phys)
 212                         return -ENOMEM;
 213
 214                 for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
 215                                 err = of_property_read_string_index(
 216                                                 dev->dev.of_node,
 217                                                 "phy-names", phy_num,
 218                                                 &phy_name);
 219
 220                                 if (err < 0) {
 221                                         if (priv->num_phys > 1) {
 222                                                 dev_err(&dev->dev, "phy-names not provided");
 223                                                 goto err_put_hcd;
 224                                         } else
 225                                                 phy_name = "usb";
 226                                 }
 227
 228                                 priv->phys[phy_num] = devm_phy_get(&dev->dev,
 229                                                 phy_name);
 230                                 if (IS_ERR(priv->phys[phy_num])) {
 231                                         err = PTR_ERR(priv->phys[phy_num]);
 232                                         if ((priv->num_phys > 1) ||
 233                                             (err == -EPROBE_DEFER))
 234                                                 goto err_put_hcd;
 235                                         priv->phys[phy_num] = NULL;
 236                                 }
 237                 }
 238
 239                 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
 240                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 241                         if (IS_ERR(priv->clks[clk])) {
 242                                 err = PTR_ERR(priv->clks[clk]);
 243                                 if (err == -EPROBE_DEFER)
 244                                         goto err_put_clks;
 245                                 priv->clks[clk] = NULL;
 246                                 break;
 247                         }
 248                 }
 249         }
 250
 251         priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
 252         if (IS_ERR(priv->rst)) {
 253                 err = PTR_ERR(priv->rst);
 254                 if (err == -EPROBE_DEFER)
 255                         goto err_put_clks;
 256                 priv->rst = NULL;
 257         } else {
 258                 err = reset_control_deassert(priv->rst);
 259                 if (err)
 260                         goto err_put_clks;
 261         }
 262
 263         if (pdata->big_endian_desc)
 264                 ehci->big_endian_desc = 1;
 265         if (pdata->big_endian_mmio)
 266                 ehci->big_endian_mmio = 1;
 267
 268 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
 269         if (ehci->big_endian_mmio) {
 270                 dev_err(&dev->dev,
 271                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
 272                 err = -EINVAL;
 273                 goto err_reset;
 274         }
 275 #endif
 276 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
 277         if (ehci->big_endian_desc) {
 278                 dev_err(&dev->dev,
 279                         "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
 280                 err = -EINVAL;
 281                 goto err_reset;
 282         }
 283 #endif
 284
 285         if (pdata->power_on) {
 286                 err = pdata->power_on(dev);
 287                 if (err < 0)
 288                         goto err_reset;
 289         }
 290
 291         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 292         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 293         if (IS_ERR(hcd->regs)) {
 294                 err = PTR_ERR(hcd->regs);
 295                 goto err_power;
 296         }
 297         hcd->rsrc_start = res_mem->start;
 298         hcd->rsrc_len = resource_size(res_mem);
 299
 300         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 301         if (err)
 302                 goto err_power;
 303
 304         device_wakeup_enable(hcd->self.controller);
 305         platform_set_drvdata(dev, hcd);
 306
 307         return err;
 308
 309 err_power:
 310         if (pdata->power_off)
 311                 pdata->power_off(dev);
 312 err_reset:
 313         if (priv->rst)
 314                 reset_control_assert(priv->rst);
 315 err_put_clks:
 316         while (--clk >= 0)
 317                 clk_put(priv->clks[clk]);
 318 err_put_hcd:
 319         if (pdata == &ehci_platform_defaults)
 320                 dev->dev.platform_data = NULL;
 321
 322         usb_put_hcd(hcd);
 323
 324         return err;
 325 }
 326
 327 static int ehci_platform_remove(struct platform_device *dev)
 328 {
 329         struct usb_hcd *hcd = platform_get_drvdata(dev);
 330         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 331         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 332         int clk;
 333
 334         usb_remove_hcd(hcd);
 335
 336         if (pdata->power_off)
 337                 pdata->power_off(dev);
 338
 339         if (priv->rst)
 340                 reset_control_assert(priv->rst);
 341
 342         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 343                 clk_put(priv->clks[clk]);
 344
 345         usb_put_hcd(hcd);
 346
 347         if (pdata == &ehci_platform_defaults)
 348                 dev->dev.platform_data = NULL;
 349
 350         return 0;
 351 }
 352
 353 #ifdef CONFIG_PM_SLEEP
 354 static int ehci_platform_suspend(struct device *dev)
 355 {
 356         struct usb_hcd *hcd = dev_get_drvdata(dev);
 357         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
 358         struct platform_device *pdev =
 359                 container_of(dev, struct platform_device, dev);
 360         bool do_wakeup = device_may_wakeup(dev);
 361         int ret;
 362
 363         ret = ehci_suspend(hcd, do_wakeup);
 364         if (ret)
 365                 return ret;
 366
 367         if (pdata->power_suspend)
 368                 pdata->power_suspend(pdev);
 369
 370         return ret;
 371 }
 372
 373 static int ehci_platform_resume(struct device *dev)
 374 {
 375         struct usb_hcd *hcd = dev_get_drvdata(dev);
 376         struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
 377         struct platform_device *pdev =
 378                 container_of(dev, struct platform_device, dev);
 379
 380         if (pdata->power_on) {
 381                 int err = pdata->power_on(pdev);
 382                 if (err < 0)
 383                         return err;
 384         }
 385
 386         ehci_resume(hcd, pdata->reset_on_resume);
 387         return 0;
 388 }
 389 #endif /* CONFIG_PM_SLEEP */
 390
 391 static const struct of_device_id vt8500_ehci_ids[] = {
 392         { .compatible = "via,vt8500-ehci", },
 393         { .compatible = "wm,prizm-ehci", },
 394         { .compatible = "generic-ehci", },
 395         { .compatible = "cavium,octeon-6335-ehci", },
 396         {}
 397 };
 398 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
 399
 400 static const struct platform_device_id ehci_platform_table[] = {
 401         { "ehci-platform", 0 },
 402         { }
 403 };
 404 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
 405
 406 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
 407         ehci_platform_resume);
 408
 409 static struct platform_driver ehci_platform_driver = {
 410         .id_table       = ehci_platform_table,
 411         .probe          = ehci_platform_probe,
 412         .remove         = ehci_platform_remove,
 413         .shutdown       = usb_hcd_platform_shutdown,
 414         .driver         = {
 415                 .name   = "ehci-platform",
 416                 .pm     = &ehci_platform_pm_ops,
 417                 .of_match_table = vt8500_ehci_ids,
 418         }
 419 };
 420
 421 static int __init ehci_platform_init(void)
 422 {
 423         if (usb_disabled())
 424                 return -ENODEV;
 425
 426         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 427
 428         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
 429         return platform_driver_register(&ehci_platform_driver);
 430 }
 431 module_init(ehci_platform_init);
 432
 433 static void __exit ehci_platform_cleanup(void)
 434 {
 435         platform_driver_unregister(&ehci_platform_driver);
 436 }
 437 module_exit(ehci_platform_cleanup);
 438
 439 MODULE_DESCRIPTION(DRIVER_DESC);
 440 MODULE_AUTHOR("Hauke Mehrtens");
 441 MODULE_AUTHOR("Alan Stern");
 442 MODULE_LICENSE("GPL");