drivers/usb/host/ohci-ep93xx.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * Bus Glue for ep93xx.
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Russell King et al.
  12  *
  13  * Modified for LH7A404 from ohci-sa1111.c
  14  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  15  *
  16  * Modified for pxa27x from ohci-lh7a404.c
  17  *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
  18  *
  19  * Modified for ep93xx from ohci-pxa27x.c
  20  *  by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
  21  *  Based on an earlier driver by Ray Lehtiniemi
  22  *
  23  * This file is licenced under the GPL.
  24  */
  25
  26 #include <linux/clk.h>
  27 #include <linux/device.h>
  28 #include <linux/signal.h>
  29 #include <linux/platform_device.h>
  30
  31 static struct clk *usb_host_clock;
  32
  33 static int ohci_ep93xx_start(struct usb_hcd *hcd)
  34 {
  35         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  36         int ret;
  37
  38         if ((ret = ohci_init(ohci)) < 0)
  39                 return ret;
  40
  41         if ((ret = ohci_run(ohci)) < 0) {
  42                 dev_err(hcd->self.controller, "can't start %s\n",
  43                         hcd->self.bus_name);
  44                 ohci_stop(hcd);
  45                 return ret;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static struct hc_driver ohci_ep93xx_hc_driver = {
  52         .description            = hcd_name,
  53         .product_desc           = "EP93xx OHCI",
  54         .hcd_priv_size          = sizeof(struct ohci_hcd),
  55         .irq                    = ohci_irq,
  56         .flags                  = HCD_USB11 | HCD_MEMORY,
  57         .start                  = ohci_ep93xx_start,
  58         .stop                   = ohci_stop,
  59         .shutdown               = ohci_shutdown,
  60         .urb_enqueue            = ohci_urb_enqueue,
  61         .urb_dequeue            = ohci_urb_dequeue,
  62         .endpoint_disable       = ohci_endpoint_disable,
  63         .get_frame_number       = ohci_get_frame,
  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 ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
  74 {
  75         struct usb_hcd *hcd;
  76         struct resource *res;
  77         int irq;
  78         int ret;
  79
  80         if (usb_disabled())
  81                 return -ENODEV;
  82
  83         irq = platform_get_irq(pdev, 0);
  84         if (irq < 0)
  85                 return irq;
  86
  87         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  88         if (!res)
  89                 return -ENXIO;
  90
  91         hcd = usb_create_hcd(&ohci_ep93xx_hc_driver, &pdev->dev, "ep93xx");
  92         if (!hcd)
  93                 return -ENOMEM;
  94
  95         hcd->rsrc_start = res->start;
  96         hcd->rsrc_len = resource_size(res);
  97
  98         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  99         if (IS_ERR(hcd->regs)) {
 100                 ret = PTR_ERR(hcd->regs);
 101                 goto err_put_hcd;
 102         }
 103
 104         usb_host_clock = devm_clk_get(&pdev->dev, NULL);
 105         if (IS_ERR(usb_host_clock)) {
 106                 ret = PTR_ERR(usb_host_clock);
 107                 goto err_put_hcd;
 108         }
 109
 110         clk_enable(usb_host_clock);
 111
 112         ohci_hcd_init(hcd_to_ohci(hcd));
 113
 114         ret = usb_add_hcd(hcd, irq, 0);
 115         if (ret)
 116                 goto err_clk_disable;
 117
 118         return 0;
 119
 120 err_clk_disable:
 121         clk_disable(usb_host_clock);
 122 err_put_hcd:
 123         usb_put_hcd(hcd);
 124
 125         return ret;
 126 }
 127
 128 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
 129 {
 130         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 131
 132         usb_remove_hcd(hcd);
 133         clk_disable(usb_host_clock);
 134         usb_put_hcd(hcd);
 135
 136         return 0;
 137 }
 138
 139 #ifdef CONFIG_PM
 140 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
 141 {
 142         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 143         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 144
 145         if (time_before(jiffies, ohci->next_statechange))
 146                 msleep(5);
 147         ohci->next_statechange = jiffies;
 148
 149         clk_disable(usb_host_clock);
 150         return 0;
 151 }
 152
 153 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 154 {
 155         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 156         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 157
 158         if (time_before(jiffies, ohci->next_statechange))
 159                 msleep(5);
 160         ohci->next_statechange = jiffies;
 161
 162         clk_enable(usb_host_clock);
 163
 164         ohci_resume(hcd, false);
 165         return 0;
 166 }
 167 #endif
 168
 169
 170 static struct platform_driver ohci_hcd_ep93xx_driver = {
 171         .probe          = ohci_hcd_ep93xx_drv_probe,
 172         .remove         = ohci_hcd_ep93xx_drv_remove,
 173         .shutdown       = usb_hcd_platform_shutdown,
 174 #ifdef CONFIG_PM
 175         .suspend        = ohci_hcd_ep93xx_drv_suspend,
 176         .resume         = ohci_hcd_ep93xx_drv_resume,
 177 #endif
 178         .driver         = {
 179                 .name   = "ep93xx-ohci",
 180                 .owner  = THIS_MODULE,
 181         },
 182 };
 183
 184 MODULE_ALIAS("platform:ep93xx-ohci");