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         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 118         if (err)
 119                 return err;
 120
 121         exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
 122                                         GFP_KERNEL);
 123         if (!exynos_ohci)
 124                 return -ENOMEM;
 125
 126         if (of_device_is_compatible(pdev->dev.of_node,
 127                                         "samsung,exynos5440-ohci"))
 128                 goto skip_phy;
 129
 130         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 131         if (IS_ERR(phy)) {
 132                 /* Fallback to pdata */
 133                 if (!pdata) {
 134                         dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
 135                         return -EPROBE_DEFER;
 136                 } else {
 137                         exynos_ohci->pdata = pdata;
 138                 }
 139         } else {
 140                 exynos_ohci->phy = phy;
 141                 exynos_ohci->otg = phy->otg;
 142         }
 143
 144 skip_phy:
 145
 146         exynos_ohci->dev = &pdev->dev;
 147
 148         hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
 149                                         dev_name(&pdev->dev));
 150         if (!hcd) {
 151                 dev_err(&pdev->dev, "Unable to create HCD\n");
 152                 return -ENOMEM;
 153         }
 154
 155         exynos_ohci->hcd = hcd;
 156         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
 157
 158         if (IS_ERR(exynos_ohci->clk)) {
 159                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 160                 err = PTR_ERR(exynos_ohci->clk);
 161                 goto fail_clk;
 162         }
 163
 164         err = clk_prepare_enable(exynos_ohci->clk);
 165         if (err)
 166                 goto fail_clk;
 167
 168         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 169         if (!res) {
 170                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 171                 err = -ENXIO;
 172                 goto fail_io;
 173         }
 174
 175         hcd->rsrc_start = res->start;
 176         hcd->rsrc_len = resource_size(res);
 177         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 178         if (!hcd->regs) {
 179                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 180                 err = -ENOMEM;
 181                 goto fail_io;
 182         }
 183
 184         irq = platform_get_irq(pdev, 0);
 185         if (!irq) {
 186                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 187                 err = -ENODEV;
 188                 goto fail_io;
 189         }
 190
 191         if (exynos_ohci->otg)
 192                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 193                                         &exynos_ohci->hcd->self);
 194
 195         exynos_ohci_phy_enable(exynos_ohci);
 196
 197         ohci = hcd_to_ohci(hcd);
 198         ohci_hcd_init(ohci);
 199
 200         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 201         if (err) {
 202                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 203                 goto fail_add_hcd;
 204         }
 205
 206         platform_set_drvdata(pdev, exynos_ohci);
 207
 208         return 0;
 209
 210 fail_add_hcd:
 211         exynos_ohci_phy_disable(exynos_ohci);
 212 fail_io:
 213         clk_disable_unprepare(exynos_ohci->clk);
 214 fail_clk:
 215         usb_put_hcd(hcd);
 216         return err;
 217 }
 218
 219 static int exynos_ohci_remove(struct platform_device *pdev)
 220 {
 221         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 222         struct usb_hcd *hcd = exynos_ohci->hcd;
 223
 224         usb_remove_hcd(hcd);
 225
 226         if (exynos_ohci->otg)
 227                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 228                                         &exynos_ohci->hcd->self);
 229
 230         exynos_ohci_phy_disable(exynos_ohci);
 231
 232         clk_disable_unprepare(exynos_ohci->clk);
 233
 234         usb_put_hcd(hcd);
 235
 236         return 0;
 237 }
 238
 239 static void exynos_ohci_shutdown(struct platform_device *pdev)
 240 {
 241         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 242         struct usb_hcd *hcd = exynos_ohci->hcd;
 243
 244         if (hcd->driver->shutdown)
 245                 hcd->driver->shutdown(hcd);
 246 }
 247
 248 #ifdef CONFIG_PM
 249 static int exynos_ohci_suspend(struct device *dev)
 250 {
 251         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 252         struct usb_hcd *hcd = exynos_ohci->hcd;
 253         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 254         unsigned long flags;
 255         int rc = 0;
 256
 257         /*
 258          * Root hub was already suspended. Disable irq emission and
 259          * mark HW unaccessible, bail out if RH has been resumed. Use
 260          * the spinlock to properly synchronize with possible pending
 261          * RH suspend or resume activity.
 262          */
 263         spin_lock_irqsave(&ohci->lock, flags);
 264         if (ohci->rh_state != OHCI_RH_SUSPENDED &&
 265                         ohci->rh_state != OHCI_RH_HALTED) {
 266                 rc = -EINVAL;
 267                 goto fail;
 268         }
 269
 270         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 271
 272         if (exynos_ohci->otg)
 273                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 274                                         &exynos_ohci->hcd->self);
 275
 276         exynos_ohci_phy_disable(exynos_ohci);
 277
 278         clk_disable_unprepare(exynos_ohci->clk);
 279
 280 fail:
 281         spin_unlock_irqrestore(&ohci->lock, flags);
 282
 283         return rc;
 284 }
 285
 286 static int exynos_ohci_resume(struct device *dev)
 287 {
 288         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 289         struct usb_hcd *hcd = exynos_ohci->hcd;
 290
 291         clk_prepare_enable(exynos_ohci->clk);
 292
 293         if (exynos_ohci->otg)
 294                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 295                                         &exynos_ohci->hcd->self);
 296
 297         exynos_ohci_phy_enable(exynos_ohci);
 298
 299         ohci_resume(hcd, false);
 300
 301         return 0;
 302 }
 303 #else
 304 #define exynos_ohci_suspend     NULL
 305 #define exynos_ohci_resume      NULL
 306 #endif
 307
 308 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 309         .suspend        = exynos_ohci_suspend,
 310         .resume         = exynos_ohci_resume,
 311 };
 312
 313 #ifdef CONFIG_OF
 314 static const struct of_device_id exynos_ohci_match[] = {
 315         { .compatible = "samsung,exynos4210-ohci" },
 316         { .compatible = "samsung,exynos5440-ohci" },
 317         {},
 318 };
 319 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
 320 #endif
 321
 322 static struct platform_driver exynos_ohci_driver = {
 323         .probe          = exynos_ohci_probe,
 324         .remove         = exynos_ohci_remove,
 325         .shutdown       = exynos_ohci_shutdown,
 326         .driver = {
 327                 .name   = "exynos-ohci",
 328                 .owner  = THIS_MODULE,
 329                 .pm     = &exynos_ohci_pm_ops,
 330                 .of_match_table = of_match_ptr(exynos_ohci_match),
 331         }
 332 };
 333
 334 MODULE_ALIAS("platform:exynos-ohci");
 335 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");