drivers/usb/host/ohci-exynos.c

   1 /*
   2  * SAMSUNG EXYNOS USB HOST OHCI Controller
   3  *
   4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   5  * Author: Jingoo Han <jg1.han@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/platform_data/usb-ohci-exynos.h>
  18 #include <linux/usb/phy.h>
  19 #include <linux/usb/samsung_usb_phy.h>
  20
  21 struct exynos_ohci_hcd {
  22         struct device *dev;
  23         struct usb_hcd *hcd;
  24         struct clk *clk;
  25         struct usb_phy *phy;
  26         struct usb_otg *otg;
  27         struct exynos4_ohci_platdata *pdata;
  28 };
  29
  30 static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci)
  31 {
  32         struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
  33
  34         if (exynos_ohci->phy)
  35                 usb_phy_init(exynos_ohci->phy);
  36         else if (exynos_ohci->pdata && exynos_ohci->pdata->phy_init)
  37                 exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
  38 }
  39
  40 static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci)
  41 {
  42         struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
  43
  44         if (exynos_ohci->phy)
  45                 usb_phy_shutdown(exynos_ohci->phy);
  46         else if (exynos_ohci->pdata && exynos_ohci->pdata->phy_exit)
  47                 exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
  48 }
  49
  50 static int ohci_exynos_reset(struct usb_hcd *hcd)
  51 {
  52         return ohci_init(hcd_to_ohci(hcd));
  53 }
  54
  55 static int ohci_exynos_start(struct usb_hcd *hcd)
  56 {
  57         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  58         int ret;
  59
  60         ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
  61
  62         ret = ohci_run(ohci);
  63         if (ret < 0) {
  64                 dev_err(hcd->self.controller, "can't start %s\n",
  65                         hcd->self.bus_name);
  66                 ohci_stop(hcd);
  67                 return ret;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static const struct hc_driver exynos_ohci_hc_driver = {
  74         .description            = hcd_name,
  75         .product_desc           = "EXYNOS OHCI Host Controller",
  76         .hcd_priv_size          = sizeof(struct ohci_hcd),
  77
  78         .irq                    = ohci_irq,
  79         .flags                  = HCD_MEMORY|HCD_USB11,
  80
  81         .reset                  = ohci_exynos_reset,
  82         .start                  = ohci_exynos_start,
  83         .stop                   = ohci_stop,
  84         .shutdown               = ohci_shutdown,
  85
  86         .get_frame_number       = ohci_get_frame,
  87
  88         .urb_enqueue            = ohci_urb_enqueue,
  89         .urb_dequeue            = ohci_urb_dequeue,
  90         .endpoint_disable       = ohci_endpoint_disable,
  91
  92         .hub_status_data        = ohci_hub_status_data,
  93         .hub_control            = ohci_hub_control,
  94 #ifdef  CONFIG_PM
  95         .bus_suspend            = ohci_bus_suspend,
  96         .bus_resume             = ohci_bus_resume,
  97 #endif
  98         .start_port_reset       = ohci_start_port_reset,
  99 };
 100
 101 static int exynos_ohci_probe(struct platform_device *pdev)
 102 {
 103         struct exynos4_ohci_platdata *pdata = dev_get_platdata(&pdev->dev);
 104         struct exynos_ohci_hcd *exynos_ohci;
 105         struct usb_hcd *hcd;
 106         struct ohci_hcd *ohci;
 107         struct resource *res;
 108         struct usb_phy *phy;
 109         int irq;
 110         int err;
 111
 112         /*
 113          * Right now device-tree probed devices don't get dma_mask set.
 114          * Since shared usb code relies on it, set it here for now.
 115          * Once we move to full device tree support this will vanish off.
 116          */
 117         if (!pdev->dev.dma_mask)
 118                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 119         if (!pdev->dev.coherent_dma_mask)
 120                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 121
 122         exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
 123                                         GFP_KERNEL);
 124         if (!exynos_ohci)
 125                 return -ENOMEM;
 126
 127         if (of_device_is_compatible(pdev->dev.of_node,
 128                                         "samsung,exynos5440-ohci"))
 129                 goto skip_phy;
 130
 131         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 132         if (IS_ERR(phy)) {
 133                 /* Fallback to pdata */
 134                 if (!pdata) {
 135                         dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
 136                         return -EPROBE_DEFER;
 137                 } else {
 138                         exynos_ohci->pdata = pdata;
 139                 }
 140         } else {
 141                 exynos_ohci->phy = phy;
 142                 exynos_ohci->otg = phy->otg;
 143         }
 144
 145 skip_phy:
 146
 147         exynos_ohci->dev = &pdev->dev;
 148
 149         hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
 150                                         dev_name(&pdev->dev));
 151         if (!hcd) {
 152                 dev_err(&pdev->dev, "Unable to create HCD\n");
 153                 return -ENOMEM;
 154         }
 155
 156         exynos_ohci->hcd = hcd;
 157         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
 158
 159         if (IS_ERR(exynos_ohci->clk)) {
 160                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 161                 err = PTR_ERR(exynos_ohci->clk);
 162                 goto fail_clk;
 163         }
 164
 165         err = clk_prepare_enable(exynos_ohci->clk);
 166         if (err)
 167                 goto fail_clk;
 168
 169         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 170         if (!res) {
 171                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 172                 err = -ENXIO;
 173                 goto fail_io;
 174         }
 175
 176         hcd->rsrc_start = res->start;
 177         hcd->rsrc_len = resource_size(res);
 178         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 179         if (!hcd->regs) {
 180                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 181                 err = -ENOMEM;
 182                 goto fail_io;
 183         }
 184
 185         irq = platform_get_irq(pdev, 0);
 186         if (!irq) {
 187                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 188                 err = -ENODEV;
 189                 goto fail_io;
 190         }
 191
 192         if (exynos_ohci->otg)
 193                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 194                                         &exynos_ohci->hcd->self);
 195
 196         exynos_ohci_phy_enable(exynos_ohci);
 197
 198         ohci = hcd_to_ohci(hcd);
 199         ohci_hcd_init(ohci);
 200
 201         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 202         if (err) {
 203                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 204                 goto fail_add_hcd;
 205         }
 206
 207         platform_set_drvdata(pdev, exynos_ohci);
 208
 209         return 0;
 210
 211 fail_add_hcd:
 212         exynos_ohci_phy_disable(exynos_ohci);
 213 fail_io:
 214         clk_disable_unprepare(exynos_ohci->clk);
 215 fail_clk:
 216         usb_put_hcd(hcd);
 217         return err;
 218 }
 219
 220 static int exynos_ohci_remove(struct platform_device *pdev)
 221 {
 222         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 223         struct usb_hcd *hcd = exynos_ohci->hcd;
 224
 225         usb_remove_hcd(hcd);
 226
 227         if (exynos_ohci->otg)
 228                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 229                                         &exynos_ohci->hcd->self);
 230
 231         exynos_ohci_phy_disable(exynos_ohci);
 232
 233         clk_disable_unprepare(exynos_ohci->clk);
 234
 235         usb_put_hcd(hcd);
 236
 237         return 0;
 238 }
 239
 240 static void exynos_ohci_shutdown(struct platform_device *pdev)
 241 {
 242         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 243         struct usb_hcd *hcd = exynos_ohci->hcd;
 244
 245         if (hcd->driver->shutdown)
 246                 hcd->driver->shutdown(hcd);
 247 }
 248
 249 #ifdef CONFIG_PM
 250 static int exynos_ohci_suspend(struct device *dev)
 251 {
 252         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 253         struct usb_hcd *hcd = exynos_ohci->hcd;
 254         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 255         unsigned long flags;
 256         int rc = 0;
 257
 258         /*
 259          * Root hub was already suspended. Disable irq emission and
 260          * mark HW unaccessible, bail out if RH has been resumed. Use
 261          * the spinlock to properly synchronize with possible pending
 262          * RH suspend or resume activity.
 263          */
 264         spin_lock_irqsave(&ohci->lock, flags);
 265         if (ohci->rh_state != OHCI_RH_SUSPENDED &&
 266                         ohci->rh_state != OHCI_RH_HALTED) {
 267                 rc = -EINVAL;
 268                 goto fail;
 269         }
 270
 271         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 272
 273         if (exynos_ohci->otg)
 274                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 275                                         &exynos_ohci->hcd->self);
 276
 277         exynos_ohci_phy_disable(exynos_ohci);
 278
 279         clk_disable_unprepare(exynos_ohci->clk);
 280
 281 fail:
 282         spin_unlock_irqrestore(&ohci->lock, flags);
 283
 284         return rc;
 285 }
 286
 287 static int exynos_ohci_resume(struct device *dev)
 288 {
 289         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 290         struct usb_hcd *hcd = exynos_ohci->hcd;
 291
 292         clk_prepare_enable(exynos_ohci->clk);
 293
 294         if (exynos_ohci->otg)
 295                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 296                                         &exynos_ohci->hcd->self);
 297
 298         exynos_ohci_phy_enable(exynos_ohci);
 299
 300         ohci_resume(hcd, false);
 301
 302         return 0;
 303 }
 304 #else
 305 #define exynos_ohci_suspend     NULL
 306 #define exynos_ohci_resume      NULL
 307 #endif
 308
 309 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 310         .suspend        = exynos_ohci_suspend,
 311         .resume         = exynos_ohci_resume,
 312 };
 313
 314 #ifdef CONFIG_OF
 315 static const struct of_device_id exynos_ohci_match[] = {
 316         { .compatible = "samsung,exynos4210-ohci" },
 317         { .compatible = "samsung,exynos5440-ohci" },
 318         {},
 319 };
 320 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
 321 #endif
 322
 323 static struct platform_driver exynos_ohci_driver = {
 324         .probe          = exynos_ohci_probe,
 325         .remove         = exynos_ohci_remove,
 326         .shutdown       = exynos_ohci_shutdown,
 327         .driver = {
 328                 .name   = "exynos-ohci",
 329                 .owner  = THIS_MODULE,
 330                 .pm     = &exynos_ohci_pm_ops,
 331                 .of_match_table = of_match_ptr(exynos_ohci_match),
 332         }
 333 };
 334
 335 MODULE_ALIAS("platform:exynos-ohci");
 336 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");