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-exynos.h>
  18 #include <linux/usb/phy.h>
  19 #include <linux/usb/samsung_usb_phy.h>
  20 #include <plat/usb-phy.h>
  21
  22 struct exynos_ohci_hcd {
  23         struct device *dev;
  24         struct usb_hcd *hcd;
  25         struct clk *clk;
  26         struct usb_phy *phy;
  27         struct usb_otg *otg;
  28         struct exynos4_ohci_platdata *pdata;
  29 };
  30
  31 static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci)
  32 {
  33         struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
  34
  35         if (exynos_ohci->phy)
  36                 usb_phy_init(exynos_ohci->phy);
  37         else if (exynos_ohci->pdata->phy_init)
  38                 exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
  39 }
  40
  41 static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci)
  42 {
  43         struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
  44
  45         if (exynos_ohci->phy)
  46                 usb_phy_shutdown(exynos_ohci->phy);
  47         else if (exynos_ohci->pdata->phy_exit)
  48                 exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
  49 }
  50
  51 static int ohci_exynos_reset(struct usb_hcd *hcd)
  52 {
  53         return ohci_init(hcd_to_ohci(hcd));
  54 }
  55
  56 static int ohci_exynos_start(struct usb_hcd *hcd)
  57 {
  58         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  59         int ret;
  60
  61         ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
  62
  63         ret = ohci_run(ohci);
  64         if (ret < 0) {
  65                 dev_err(hcd->self.controller, "can't start %s\n",
  66                         hcd->self.bus_name);
  67                 ohci_stop(hcd);
  68                 return ret;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static const struct hc_driver exynos_ohci_hc_driver = {
  75         .description            = hcd_name,
  76         .product_desc           = "EXYNOS OHCI Host Controller",
  77         .hcd_priv_size          = sizeof(struct ohci_hcd),
  78
  79         .irq                    = ohci_irq,
  80         .flags                  = HCD_MEMORY|HCD_USB11,
  81
  82         .reset                  = ohci_exynos_reset,
  83         .start                  = ohci_exynos_start,
  84         .stop                   = ohci_stop,
  85         .shutdown               = ohci_shutdown,
  86
  87         .get_frame_number       = ohci_get_frame,
  88
  89         .urb_enqueue            = ohci_urb_enqueue,
  90         .urb_dequeue            = ohci_urb_dequeue,
  91         .endpoint_disable       = ohci_endpoint_disable,
  92
  93         .hub_status_data        = ohci_hub_status_data,
  94         .hub_control            = ohci_hub_control,
  95 #ifdef  CONFIG_PM
  96         .bus_suspend            = ohci_bus_suspend,
  97         .bus_resume             = ohci_bus_resume,
  98 #endif
  99         .start_port_reset       = ohci_start_port_reset,
 100 };
 101
 102 static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
 103
 104 static int exynos_ohci_probe(struct platform_device *pdev)
 105 {
 106         struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
 107         struct exynos_ohci_hcd *exynos_ohci;
 108         struct usb_hcd *hcd;
 109         struct ohci_hcd *ohci;
 110         struct resource *res;
 111         struct usb_phy *phy;
 112         int irq;
 113         int err;
 114
 115         /*
 116          * Right now device-tree probed devices don't get dma_mask set.
 117          * Since shared usb code relies on it, set it here for now.
 118          * Once we move to full device tree support this will vanish off.
 119          */
 120         if (!pdev->dev.dma_mask)
 121                 pdev->dev.dma_mask = &ohci_exynos_dma_mask;
 122         if (!pdev->dev.coherent_dma_mask)
 123                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 124
 125         exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
 126                                         GFP_KERNEL);
 127         if (!exynos_ohci)
 128                 return -ENOMEM;
 129
 130         phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 131         if (IS_ERR_OR_NULL(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         exynos_ohci->dev = &pdev->dev;
 145
 146         hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
 147                                         dev_name(&pdev->dev));
 148         if (!hcd) {
 149                 dev_err(&pdev->dev, "Unable to create HCD\n");
 150                 return -ENOMEM;
 151         }
 152
 153         exynos_ohci->hcd = hcd;
 154         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
 155
 156         if (IS_ERR(exynos_ohci->clk)) {
 157                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 158                 err = PTR_ERR(exynos_ohci->clk);
 159                 goto fail_clk;
 160         }
 161
 162         err = clk_prepare_enable(exynos_ohci->clk);
 163         if (err)
 164                 goto fail_clk;
 165
 166         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 167         if (!res) {
 168                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 169                 err = -ENXIO;
 170                 goto fail_io;
 171         }
 172
 173         hcd->rsrc_start = res->start;
 174         hcd->rsrc_len = resource_size(res);
 175         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 176         if (!hcd->regs) {
 177                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 178                 err = -ENOMEM;
 179                 goto fail_io;
 180         }
 181
 182         irq = platform_get_irq(pdev, 0);
 183         if (!irq) {
 184                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 185                 err = -ENODEV;
 186                 goto fail_io;
 187         }
 188
 189         if (exynos_ohci->otg)
 190                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 191                                         &exynos_ohci->hcd->self);
 192
 193         exynos_ohci_phy_enable(exynos_ohci);
 194
 195         ohci = hcd_to_ohci(hcd);
 196         ohci_hcd_init(ohci);
 197
 198         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 199         if (err) {
 200                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 201                 goto fail_add_hcd;
 202         }
 203
 204         platform_set_drvdata(pdev, exynos_ohci);
 205
 206         return 0;
 207
 208 fail_add_hcd:
 209         exynos_ohci_phy_disable(exynos_ohci);
 210 fail_io:
 211         clk_disable_unprepare(exynos_ohci->clk);
 212 fail_clk:
 213         usb_put_hcd(hcd);
 214         return err;
 215 }
 216
 217 static int exynos_ohci_remove(struct platform_device *pdev)
 218 {
 219         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 220         struct usb_hcd *hcd = exynos_ohci->hcd;
 221
 222         usb_remove_hcd(hcd);
 223
 224         if (exynos_ohci->otg)
 225                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 226                                         &exynos_ohci->hcd->self);
 227
 228         exynos_ohci_phy_disable(exynos_ohci);
 229
 230         clk_disable_unprepare(exynos_ohci->clk);
 231
 232         usb_put_hcd(hcd);
 233
 234         return 0;
 235 }
 236
 237 static void exynos_ohci_shutdown(struct platform_device *pdev)
 238 {
 239         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 240         struct usb_hcd *hcd = exynos_ohci->hcd;
 241
 242         if (hcd->driver->shutdown)
 243                 hcd->driver->shutdown(hcd);
 244 }
 245
 246 #ifdef CONFIG_PM
 247 static int exynos_ohci_suspend(struct device *dev)
 248 {
 249         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 250         struct usb_hcd *hcd = exynos_ohci->hcd;
 251         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 252         unsigned long flags;
 253         int rc = 0;
 254
 255         /*
 256          * Root hub was already suspended. Disable irq emission and
 257          * mark HW unaccessible, bail out if RH has been resumed. Use
 258          * the spinlock to properly synchronize with possible pending
 259          * RH suspend or resume activity.
 260          */
 261         spin_lock_irqsave(&ohci->lock, flags);
 262         if (ohci->rh_state != OHCI_RH_SUSPENDED &&
 263                         ohci->rh_state != OHCI_RH_HALTED) {
 264                 rc = -EINVAL;
 265                 goto fail;
 266         }
 267
 268         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 269
 270         if (exynos_ohci->otg)
 271                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 272                                         &exynos_ohci->hcd->self);
 273
 274         exynos_ohci_phy_disable(exynos_ohci);
 275
 276         clk_disable_unprepare(exynos_ohci->clk);
 277
 278 fail:
 279         spin_unlock_irqrestore(&ohci->lock, flags);
 280
 281         return rc;
 282 }
 283
 284 static int exynos_ohci_resume(struct device *dev)
 285 {
 286         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 287         struct usb_hcd *hcd = exynos_ohci->hcd;
 288
 289         clk_prepare_enable(exynos_ohci->clk);
 290
 291         if (exynos_ohci->otg)
 292                 exynos_ohci->otg->set_host(exynos_ohci->otg,
 293                                         &exynos_ohci->hcd->self);
 294
 295         exynos_ohci_phy_enable(exynos_ohci);
 296
 297         ohci_resume(hcd, false);
 298
 299         return 0;
 300 }
 301 #else
 302 #define exynos_ohci_suspend     NULL
 303 #define exynos_ohci_resume      NULL
 304 #endif
 305
 306 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 307         .suspend        = exynos_ohci_suspend,
 308         .resume         = exynos_ohci_resume,
 309 };
 310
 311 #ifdef CONFIG_OF
 312 static const struct of_device_id exynos_ohci_match[] = {
 313         { .compatible = "samsung,exynos4210-ohci" },
 314         {},
 315 };
 316 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
 317 #endif
 318
 319 static struct platform_driver exynos_ohci_driver = {
 320         .probe          = exynos_ohci_probe,
 321         .remove         = exynos_ohci_remove,
 322         .shutdown       = exynos_ohci_shutdown,
 323         .driver = {
 324                 .name   = "exynos-ohci",
 325                 .owner  = THIS_MODULE,
 326                 .pm     = &exynos_ohci_pm_ops,
 327                 .of_match_table = of_match_ptr(exynos_ohci_match),
 328         }
 329 };
 330
 331 MODULE_ALIAS("platform:exynos-ohci");
 332 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");