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