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