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 <mach/ohci.h>
  18 #include <plat/usb-phy.h>
  19
  20 struct exynos_ohci_hcd {
  21         struct device *dev;
  22         struct usb_hcd *hcd;
  23         struct clk *clk;
  24 };
  25
  26 static int ohci_exynos_start(struct usb_hcd *hcd)
  27 {
  28         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  29         int ret;
  30
  31         ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
  32
  33         ret = ohci_init(ohci);
  34         if (ret < 0)
  35                 return ret;
  36
  37         ret = ohci_run(ohci);
  38         if (ret < 0) {
  39                 dev_err(hcd->self.controller, "can't start %s\n",
  40                         hcd->self.bus_name);
  41                 ohci_stop(hcd);
  42                 return ret;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static const struct hc_driver exynos_ohci_hc_driver = {
  49         .description            = hcd_name,
  50         .product_desc           = "EXYNOS OHCI Host Controller",
  51         .hcd_priv_size          = sizeof(struct ohci_hcd),
  52
  53         .irq                    = ohci_irq,
  54         .flags                  = HCD_MEMORY|HCD_USB11,
  55
  56         .start                  = ohci_exynos_start,
  57         .stop                   = ohci_stop,
  58         .shutdown               = ohci_shutdown,
  59
  60         .get_frame_number       = ohci_get_frame,
  61
  62         .urb_enqueue            = ohci_urb_enqueue,
  63         .urb_dequeue            = ohci_urb_dequeue,
  64         .endpoint_disable       = ohci_endpoint_disable,
  65
  66         .hub_status_data        = ohci_hub_status_data,
  67         .hub_control            = ohci_hub_control,
  68 #ifdef  CONFIG_PM
  69         .bus_suspend            = ohci_bus_suspend,
  70         .bus_resume             = ohci_bus_resume,
  71 #endif
  72         .start_port_reset       = ohci_start_port_reset,
  73 };
  74
  75 static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
  76
  77 static int __devinit exynos_ohci_probe(struct platform_device *pdev)
  78 {
  79         struct exynos4_ohci_platdata *pdata;
  80         struct exynos_ohci_hcd *exynos_ohci;
  81         struct usb_hcd *hcd;
  82         struct ohci_hcd *ohci;
  83         struct resource *res;
  84         int irq;
  85         int err;
  86
  87         pdata = pdev->dev.platform_data;
  88         if (!pdata) {
  89                 dev_err(&pdev->dev, "No platform data defined\n");
  90                 return -EINVAL;
  91         }
  92
  93         /*
  94          * Right now device-tree probed devices don't get dma_mask set.
  95          * Since shared usb code relies on it, set it here for now.
  96          * Once we move to full device tree support this will vanish off.
  97          */
  98         if (!pdev->dev.dma_mask)
  99                 pdev->dev.dma_mask = &ohci_exynos_dma_mask;
 100         if (!pdev->dev.coherent_dma_mask)
 101                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 102
 103         exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
 104                                         GFP_KERNEL);
 105         if (!exynos_ohci)
 106                 return -ENOMEM;
 107
 108         exynos_ohci->dev = &pdev->dev;
 109
 110         hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
 111                                         dev_name(&pdev->dev));
 112         if (!hcd) {
 113                 dev_err(&pdev->dev, "Unable to create HCD\n");
 114                 return -ENOMEM;
 115         }
 116
 117         exynos_ohci->hcd = hcd;
 118         exynos_ohci->clk = clk_get(&pdev->dev, "usbhost");
 119
 120         if (IS_ERR(exynos_ohci->clk)) {
 121                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 122                 err = PTR_ERR(exynos_ohci->clk);
 123                 goto fail_clk;
 124         }
 125
 126         err = clk_enable(exynos_ohci->clk);
 127         if (err)
 128                 goto fail_clken;
 129
 130         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 131         if (!res) {
 132                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
 133                 err = -ENXIO;
 134                 goto fail_io;
 135         }
 136
 137         hcd->rsrc_start = res->start;
 138         hcd->rsrc_len = resource_size(res);
 139         hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 140         if (!hcd->regs) {
 141                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 142                 err = -ENOMEM;
 143                 goto fail_io;
 144         }
 145
 146         irq = platform_get_irq(pdev, 0);
 147         if (!irq) {
 148                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 149                 err = -ENODEV;
 150                 goto fail_io;
 151         }
 152
 153         if (pdata->phy_init)
 154                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
 155
 156         ohci = hcd_to_ohci(hcd);
 157         ohci_hcd_init(ohci);
 158
 159         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 160         if (err) {
 161                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 162                 goto fail_io;
 163         }
 164
 165         platform_set_drvdata(pdev, exynos_ohci);
 166
 167         return 0;
 168
 169 fail_io:
 170         clk_disable(exynos_ohci->clk);
 171 fail_clken:
 172         clk_put(exynos_ohci->clk);
 173 fail_clk:
 174         usb_put_hcd(hcd);
 175         return err;
 176 }
 177
 178 static int __devexit exynos_ohci_remove(struct platform_device *pdev)
 179 {
 180         struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
 181         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 182         struct usb_hcd *hcd = exynos_ohci->hcd;
 183
 184         usb_remove_hcd(hcd);
 185
 186         if (pdata && pdata->phy_exit)
 187                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
 188
 189         clk_disable(exynos_ohci->clk);
 190         clk_put(exynos_ohci->clk);
 191
 192         usb_put_hcd(hcd);
 193
 194         return 0;
 195 }
 196
 197 static void exynos_ohci_shutdown(struct platform_device *pdev)
 198 {
 199         struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
 200         struct usb_hcd *hcd = exynos_ohci->hcd;
 201
 202         if (hcd->driver->shutdown)
 203                 hcd->driver->shutdown(hcd);
 204 }
 205
 206 #ifdef CONFIG_PM
 207 static int exynos_ohci_suspend(struct device *dev)
 208 {
 209         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 210         struct usb_hcd *hcd = exynos_ohci->hcd;
 211         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 212         struct platform_device *pdev = to_platform_device(dev);
 213         struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
 214         unsigned long flags;
 215         int rc = 0;
 216
 217         /*
 218          * Root hub was already suspended. Disable irq emission and
 219          * mark HW unaccessible, bail out if RH has been resumed. Use
 220          * the spinlock to properly synchronize with possible pending
 221          * RH suspend or resume activity.
 222          */
 223         spin_lock_irqsave(&ohci->lock, flags);
 224         if (ohci->rh_state != OHCI_RH_SUSPENDED &&
 225                         ohci->rh_state != OHCI_RH_HALTED) {
 226                 rc = -EINVAL;
 227                 goto fail;
 228         }
 229
 230         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 231
 232         if (pdata && pdata->phy_exit)
 233                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
 234
 235         clk_disable(exynos_ohci->clk);
 236
 237 fail:
 238         spin_unlock_irqrestore(&ohci->lock, flags);
 239
 240         return rc;
 241 }
 242
 243 static int exynos_ohci_resume(struct device *dev)
 244 {
 245         struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
 246         struct usb_hcd *hcd = exynos_ohci->hcd;
 247         struct platform_device *pdev = to_platform_device(dev);
 248         struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
 249
 250         clk_enable(exynos_ohci->clk);
 251
 252         if (pdata && pdata->phy_init)
 253                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
 254
 255         /* Mark hardware accessible again as we are out of D3 state by now */
 256         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 257
 258         ohci_finish_controller_resume(hcd);
 259
 260         return 0;
 261 }
 262 #else
 263 #define exynos_ohci_suspend     NULL
 264 #define exynos_ohci_resume      NULL
 265 #endif
 266
 267 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 268         .suspend        = exynos_ohci_suspend,
 269         .resume         = exynos_ohci_resume,
 270 };
 271
 272 #ifdef CONFIG_OF
 273 static const struct of_device_id exynos_ohci_match[] = {
 274         { .compatible = "samsung,exynos-ohci" },
 275         {},
 276 };
 277 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
 278 #endif
 279
 280 static struct platform_driver exynos_ohci_driver = {
 281         .probe          = exynos_ohci_probe,
 282         .remove         = __devexit_p(exynos_ohci_remove),
 283         .shutdown       = exynos_ohci_shutdown,
 284         .driver = {
 285                 .name   = "exynos-ohci",
 286                 .owner  = THIS_MODULE,
 287                 .pm     = &exynos_ohci_pm_ops,
 288                 .of_match_table = of_match_ptr(exynos_ohci_match),
 289         }
 290 };
 291
 292 MODULE_ALIAS("platform:exynos-ohci");
 293 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");