drivers/usb/host/ohci-platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic platform ohci driver
   4  *
   5  * Copyright 2007 Michael Buesch <m@bues.ch>
   6  * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
   7  * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
   8  *
   9  * Derived from the OCHI-SSB driver
  10  * Derived from the OHCI-PCI driver
  11  * Copyright 1999 Roman Weissgaerber
  12  * Copyright 2000-2002 David Brownell
  13  * Copyright 1999 Linus Torvalds
  14  * Copyright 1999 Gregory P. Smith
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/hrtimer.h>
  20 #include <linux/io.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/err.h>
  24 #include <linux/of.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/reset.h>
  28 #include <linux/usb/ohci_pdriver.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/hcd.h>
  31
  32 #include "ohci.h"
  33
  34 #define DRIVER_DESC "OHCI generic platform driver"
  35 #define OHCI_MAX_CLKS 3
  36 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
  37
  38 struct ohci_platform_priv {
  39         struct clk *clks[OHCI_MAX_CLKS];
  40         struct reset_control *resets;
  41 };
  42
  43 static const char hcd_name[] = "ohci-platform";
  44
  45 static int ohci_platform_power_on(struct platform_device *dev)
  46 {
  47         struct usb_hcd *hcd = platform_get_drvdata(dev);
  48         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
  49         int clk, ret;
  50
  51         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
  52                 ret = clk_prepare_enable(priv->clks[clk]);
  53                 if (ret)
  54                         goto err_disable_clks;
  55         }
  56
  57         return 0;
  58
  59 err_disable_clks:
  60         while (--clk >= 0)
  61                 clk_disable_unprepare(priv->clks[clk]);
  62
  63         return ret;
  64 }
  65
  66 static void ohci_platform_power_off(struct platform_device *dev)
  67 {
  68         struct usb_hcd *hcd = platform_get_drvdata(dev);
  69         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
  70         int clk;
  71
  72         for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
  73                 if (priv->clks[clk])
  74                         clk_disable_unprepare(priv->clks[clk]);
  75 }
  76
  77 static struct hc_driver __read_mostly ohci_platform_hc_driver;
  78
  79 static const struct ohci_driver_overrides platform_overrides __initconst = {
  80         .product_desc =         "Generic Platform OHCI controller",
  81         .extra_priv_size =      sizeof(struct ohci_platform_priv),
  82 };
  83
  84 static struct usb_ohci_pdata ohci_platform_defaults = {
  85         .power_on =             ohci_platform_power_on,
  86         .power_suspend =        ohci_platform_power_off,
  87         .power_off =            ohci_platform_power_off,
  88 };
  89
  90 static int ohci_platform_probe(struct platform_device *dev)
  91 {
  92         struct usb_hcd *hcd;
  93         struct resource *res_mem;
  94         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
  95         struct ohci_platform_priv *priv;
  96         struct ohci_hcd *ohci;
  97         int err, irq, clk = 0;
  98
  99         if (usb_disabled())
 100                 return -ENODEV;
 101
 102         /*
 103          * Use reasonable defaults so platforms don't have to provide these
 104          * with DT probing on ARM.
 105          */
 106         if (!pdata)
 107                 pdata = &ohci_platform_defaults;
 108
 109         err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
 110         if (err)
 111                 return err;
 112
 113         irq = platform_get_irq(dev, 0);
 114         if (irq < 0) {
 115                 dev_err(&dev->dev, "no irq provided");
 116                 return irq;
 117         }
 118
 119         hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
 120                         dev_name(&dev->dev));
 121         if (!hcd)
 122                 return -ENOMEM;
 123
 124         platform_set_drvdata(dev, hcd);
 125         dev->dev.platform_data = pdata;
 126         priv = hcd_to_ohci_priv(hcd);
 127         ohci = hcd_to_ohci(hcd);
 128
 129         if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
 130                 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
 131                         ohci->flags |= OHCI_QUIRK_BE_MMIO;
 132
 133                 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
 134                         ohci->flags |= OHCI_QUIRK_BE_DESC;
 135
 136                 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
 137                         ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
 138
 139                 if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no"))
 140                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
 141
 142                 if (of_property_read_bool(dev->dev.of_node,
 143                                           "remote-wakeup-connected"))
 144                         ohci->hc_control = OHCI_CTRL_RWC;
 145
 146                 of_property_read_u32(dev->dev.of_node, "num-ports",
 147                                      &ohci->num_ports);
 148
 149                 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
 150                         priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 151                         if (IS_ERR(priv->clks[clk])) {
 152                                 err = PTR_ERR(priv->clks[clk]);
 153                                 if (err == -EPROBE_DEFER)
 154                                         goto err_put_clks;
 155                                 priv->clks[clk] = NULL;
 156                                 break;
 157                         }
 158                 }
 159
 160                 priv->resets = devm_reset_control_array_get_optional_shared(
 161                                                                 &dev->dev);
 162                 if (IS_ERR(priv->resets)) {
 163                         err = PTR_ERR(priv->resets);
 164                         goto err_put_clks;
 165                 }
 166
 167                 err = reset_control_deassert(priv->resets);
 168                 if (err)
 169                         goto err_put_clks;
 170         }
 171
 172         if (pdata->big_endian_desc)
 173                 ohci->flags |= OHCI_QUIRK_BE_DESC;
 174         if (pdata->big_endian_mmio)
 175                 ohci->flags |= OHCI_QUIRK_BE_MMIO;
 176         if (pdata->no_big_frame_no)
 177                 ohci->flags |= OHCI_QUIRK_FRAME_NO;
 178         if (pdata->num_ports)
 179                 ohci->num_ports = pdata->num_ports;
 180
 181 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
 182         if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
 183                 dev_err(&dev->dev,
 184                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
 185                 err = -EINVAL;
 186                 goto err_reset;
 187         }
 188 #endif
 189 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
 190         if (ohci->flags & OHCI_QUIRK_BE_DESC) {
 191                 dev_err(&dev->dev,
 192                         "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
 193                 err = -EINVAL;
 194                 goto err_reset;
 195         }
 196 #endif
 197
 198         pm_runtime_set_active(&dev->dev);
 199         pm_runtime_enable(&dev->dev);
 200         if (pdata->power_on) {
 201                 err = pdata->power_on(dev);
 202                 if (err < 0)
 203                         goto err_reset;
 204         }
 205
 206         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 207         hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
 208         if (IS_ERR(hcd->regs)) {
 209                 err = PTR_ERR(hcd->regs);
 210                 goto err_power;
 211         }
 212         hcd->rsrc_start = res_mem->start;
 213         hcd->rsrc_len = resource_size(res_mem);
 214
 215         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 216         if (err)
 217                 goto err_power;
 218
 219         device_wakeup_enable(hcd->self.controller);
 220
 221         platform_set_drvdata(dev, hcd);
 222
 223         return err;
 224
 225 err_power:
 226         if (pdata->power_off)
 227                 pdata->power_off(dev);
 228 err_reset:
 229         pm_runtime_disable(&dev->dev);
 230         reset_control_assert(priv->resets);
 231 err_put_clks:
 232         while (--clk >= 0)
 233                 clk_put(priv->clks[clk]);
 234
 235         if (pdata == &ohci_platform_defaults)
 236                 dev->dev.platform_data = NULL;
 237
 238         usb_put_hcd(hcd);
 239
 240         return err;
 241 }
 242
 243 static int ohci_platform_remove(struct platform_device *dev)
 244 {
 245         struct usb_hcd *hcd = platform_get_drvdata(dev);
 246         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 247         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 248         int clk;
 249
 250         pm_runtime_get_sync(&dev->dev);
 251         usb_remove_hcd(hcd);
 252
 253         if (pdata->power_off)
 254                 pdata->power_off(dev);
 255
 256         reset_control_assert(priv->resets);
 257
 258         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
 259                 clk_put(priv->clks[clk]);
 260
 261         usb_put_hcd(hcd);
 262
 263         pm_runtime_put_sync(&dev->dev);
 264         pm_runtime_disable(&dev->dev);
 265
 266         if (pdata == &ohci_platform_defaults)
 267                 dev->dev.platform_data = NULL;
 268
 269         return 0;
 270 }
 271
 272 #ifdef CONFIG_PM_SLEEP
 273 static int ohci_platform_suspend(struct device *dev)
 274 {
 275         struct usb_hcd *hcd = dev_get_drvdata(dev);
 276         struct usb_ohci_pdata *pdata = dev->platform_data;
 277         struct platform_device *pdev = to_platform_device(dev);
 278         bool do_wakeup = device_may_wakeup(dev);
 279         int ret;
 280
 281         ret = ohci_suspend(hcd, do_wakeup);
 282         if (ret)
 283                 return ret;
 284
 285         if (pdata->power_suspend)
 286                 pdata->power_suspend(pdev);
 287
 288         return ret;
 289 }
 290
 291 static int ohci_platform_resume(struct device *dev)
 292 {
 293         struct usb_hcd *hcd = dev_get_drvdata(dev);
 294         struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
 295         struct platform_device *pdev = to_platform_device(dev);
 296
 297         if (pdata->power_on) {
 298                 int err = pdata->power_on(pdev);
 299                 if (err < 0)
 300                         return err;
 301         }
 302
 303         ohci_resume(hcd, false);
 304         return 0;
 305 }
 306 #endif /* CONFIG_PM_SLEEP */
 307
 308 static const struct of_device_id ohci_platform_ids[] = {
 309         { .compatible = "generic-ohci", },
 310         { .compatible = "cavium,octeon-6335-ohci", },
 311         { .compatible = "ti,ohci-omap3", },
 312         { }
 313 };
 314 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
 315
 316 static const struct platform_device_id ohci_platform_table[] = {
 317         { "ohci-platform", 0 },
 318         { }
 319 };
 320 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
 321
 322 static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend,
 323         ohci_platform_resume);
 324
 325 static struct platform_driver ohci_platform_driver = {
 326         .id_table       = ohci_platform_table,
 327         .probe          = ohci_platform_probe,
 328         .remove         = ohci_platform_remove,
 329         .shutdown       = usb_hcd_platform_shutdown,
 330         .driver         = {
 331                 .name   = "ohci-platform",
 332                 .pm     = &ohci_platform_pm_ops,
 333                 .of_match_table = ohci_platform_ids,
 334         }
 335 };
 336
 337 static int __init ohci_platform_init(void)
 338 {
 339         if (usb_disabled())
 340                 return -ENODEV;
 341
 342         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 343
 344         ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
 345         return platform_driver_register(&ohci_platform_driver);
 346 }
 347 module_init(ohci_platform_init);
 348
 349 static void __exit ohci_platform_cleanup(void)
 350 {
 351         platform_driver_unregister(&ohci_platform_driver);
 352 }
 353 module_exit(ohci_platform_cleanup);
 354
 355 MODULE_DESCRIPTION(DRIVER_DESC);
 356 MODULE_AUTHOR("Hauke Mehrtens");
 357 MODULE_AUTHOR("Alan Stern");
 358 MODULE_LICENSE("GPL");