drivers/usb/host/ehci-platform.c

   1 /*
   2  * Generic platform ehci driver
   3  *
   4  * Copyright 2007 Steven Brown <sbrown@cortland.com>
   5  * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
   6  *
   7  * Derived from the ohci-ssb driver
   8  * Copyright 2007 Michael Buesch <m@bues.ch>
   9  *
  10  * Derived from the EHCI-PCI driver
  11  * Copyright (c) 2000-2004 by David Brownell
  12  *
  13  * Derived from the ohci-pci driver
  14  * Copyright 1999 Roman Weissgaerber
  15  * Copyright 2000-2002 David Brownell
  16  * Copyright 1999 Linus Torvalds
  17  * Copyright 1999 Gregory P. Smith
  18  *
  19  * Licensed under the GNU/GPL. See COPYING for details.
  20  */
  21 #include <linux/platform_device.h>
  22 #include <linux/usb/ehci_pdriver.h>
  23
  24 static int ehci_platform_reset(struct usb_hcd *hcd)
  25 {
  26         struct platform_device *pdev = to_platform_device(hcd->self.controller);
  27         struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
  28         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  29         int retval;
  30
  31         hcd->has_tt = pdata->has_tt;
  32         ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
  33         ehci->big_endian_desc = pdata->big_endian_desc;
  34         ehci->big_endian_mmio = pdata->big_endian_mmio;
  35
  36         ehci->caps = hcd->regs + pdata->caps_offset;
  37         retval = ehci_setup(hcd);
  38         if (retval)
  39                 return retval;
  40
  41         if (pdata->port_power_on)
  42                 ehci_port_power(ehci, 1);
  43         if (pdata->port_power_off)
  44                 ehci_port_power(ehci, 0);
  45
  46         return 0;
  47 }
  48
  49 static const struct hc_driver ehci_platform_hc_driver = {
  50         .description            = hcd_name,
  51         .product_desc           = "Generic Platform EHCI Controller",
  52         .hcd_priv_size          = sizeof(struct ehci_hcd),
  53
  54         .irq                    = ehci_irq,
  55         .flags                  = HCD_MEMORY | HCD_USB2,
  56
  57         .reset                  = ehci_platform_reset,
  58         .start                  = ehci_run,
  59         .stop                   = ehci_stop,
  60         .shutdown               = ehci_shutdown,
  61
  62         .urb_enqueue            = ehci_urb_enqueue,
  63         .urb_dequeue            = ehci_urb_dequeue,
  64         .endpoint_disable       = ehci_endpoint_disable,
  65         .endpoint_reset         = ehci_endpoint_reset,
  66
  67         .get_frame_number       = ehci_get_frame,
  68
  69         .hub_status_data        = ehci_hub_status_data,
  70         .hub_control            = ehci_hub_control,
  71 #if defined(CONFIG_PM)
  72         .bus_suspend            = ehci_bus_suspend,
  73         .bus_resume             = ehci_bus_resume,
  74 #endif
  75         .relinquish_port        = ehci_relinquish_port,
  76         .port_handed_over       = ehci_port_handed_over,
  77
  78         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
  79 };
  80
  81 static int __devinit ehci_platform_probe(struct platform_device *dev)
  82 {
  83         struct usb_hcd *hcd;
  84         struct resource *res_mem;
  85         int irq;
  86         int err = -ENOMEM;
  87
  88         BUG_ON(!dev->dev.platform_data);
  89
  90         if (usb_disabled())
  91                 return -ENODEV;
  92
  93         irq = platform_get_irq(dev, 0);
  94         if (irq < 0) {
  95                 pr_err("no irq provided");
  96                 return irq;
  97         }
  98         res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
  99         if (!res_mem) {
 100                 pr_err("no memory recourse provided");
 101                 return -ENXIO;
 102         }
 103
 104         hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 105                              dev_name(&dev->dev));
 106         if (!hcd)
 107                 return -ENOMEM;
 108
 109         hcd->rsrc_start = res_mem->start;
 110         hcd->rsrc_len = resource_size(res_mem);
 111
 112         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 113                 pr_err("controller already in use");
 114                 err = -EBUSY;
 115                 goto err_put_hcd;
 116         }
 117
 118         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 119         if (!hcd->regs)
 120                 goto err_release_region;
 121         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 122         if (err)
 123                 goto err_iounmap;
 124
 125         platform_set_drvdata(dev, hcd);
 126
 127         return err;
 128
 129 err_iounmap:
 130         iounmap(hcd->regs);
 131 err_release_region:
 132         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 133 err_put_hcd:
 134         usb_put_hcd(hcd);
 135         return err;
 136 }
 137
 138 static int __devexit ehci_platform_remove(struct platform_device *dev)
 139 {
 140         struct usb_hcd *hcd = platform_get_drvdata(dev);
 141
 142         usb_remove_hcd(hcd);
 143         iounmap(hcd->regs);
 144         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 145         usb_put_hcd(hcd);
 146         platform_set_drvdata(dev, NULL);
 147
 148         return 0;
 149 }
 150
 151 #ifdef CONFIG_PM
 152
 153 static int ehci_platform_suspend(struct device *dev)
 154 {
 155         struct usb_hcd *hcd = dev_get_drvdata(dev);
 156         bool do_wakeup = device_may_wakeup(dev);
 157
 158         return ehci_suspend(hcd, do_wakeup);
 159 }
 160
 161 static int ehci_platform_resume(struct device *dev)
 162 {
 163         struct usb_hcd *hcd = dev_get_drvdata(dev);
 164
 165         ehci_resume(hcd, false);
 166         return 0;
 167 }
 168
 169 #else /* !CONFIG_PM */
 170 #define ehci_platform_suspend   NULL
 171 #define ehci_platform_resume    NULL
 172 #endif /* CONFIG_PM */
 173
 174 static const struct platform_device_id ehci_platform_table[] = {
 175         { "ehci-platform", 0 },
 176         { }
 177 };
 178 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
 179
 180 static const struct dev_pm_ops ehci_platform_pm_ops = {
 181         .suspend        = ehci_platform_suspend,
 182         .resume         = ehci_platform_resume,
 183 };
 184
 185 static struct platform_driver ehci_platform_driver = {
 186         .id_table       = ehci_platform_table,
 187         .probe          = ehci_platform_probe,
 188         .remove         = __devexit_p(ehci_platform_remove),
 189         .shutdown       = usb_hcd_platform_shutdown,
 190         .driver         = {
 191                 .owner  = THIS_MODULE,
 192                 .name   = "ehci-platform",
 193                 .pm     = &ehci_platform_pm_ops,
 194         }
 195 };