target/linux/ar71xx/files/drivers/usb/host/ehci-ar71xx.c

   1 /*
   2  *  Bus Glue for Atheros AR71xx built-in EHCI controller.
   3  *
   4  *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Parts of this file are based on Atheros' 2.6.15 BSP
   8  *      Copyright (C) 2007 Atheros Communications, Inc.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  */
  14
  15 #include <linux/platform_device.h>
  16 #include <linux/delay.h>
  17
  18 #include <asm/mach-ar71xx/platform.h>
  19
  20 extern int usb_disabled(void);
  21
  22 static int ehci_ar71xx_init(struct usb_hcd *hcd)
  23 {
  24         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  25         int ret;
  26
  27         ehci->caps = hcd->regs;
  28         ehci->regs = hcd->regs +
  29                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  30         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  31
  32         ehci->sbrn = 0x20;
  33
  34         ehci_reset(ehci);
  35
  36         ret = ehci_init(hcd);
  37         if (ret)
  38                 return ret;
  39
  40         ehci_port_power(ehci, 0);
  41
  42         return 0;
  43 }
  44
  45 static int ehci_ar91xx_init(struct usb_hcd *hcd)
  46 {
  47         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  48         int ret;
  49
  50         ehci->caps = hcd->regs + 0x100;
  51         ehci->regs = hcd->regs + 0x100 +
  52                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  53         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  54
  55         hcd->has_tt = 1;
  56         ehci->sbrn = 0x20;
  57
  58         ehci_reset(ehci);
  59
  60         ret = ehci_init(hcd);
  61         if (ret)
  62                 return ret;
  63
  64         ehci_port_power(ehci, 0);
  65
  66         return 0;
  67 }
  68
  69 static int ehci_ar71xx_probe(const struct hc_driver *driver,
  70                              struct usb_hcd **hcd_out,
  71                              struct platform_device *pdev)
  72 {
  73         struct usb_hcd *hcd;
  74         struct resource *res;
  75         int irq;
  76         int ret;
  77
  78         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  79         if (!res) {
  80                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  81                         pdev->dev.bus_id);
  82                 return -ENODEV;
  83         }
  84         irq = res->start;
  85
  86         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  87         if (!res) {
  88                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  89                         pdev->dev.bus_id);
  90                 return -ENODEV;
  91         }
  92
  93         hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
  94         if (!hcd)
  95                 return -ENOMEM;
  96
  97         hcd->rsrc_start = res->start;
  98         hcd->rsrc_len   = res->end - res->start + 1;
  99
 100         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 101                 dev_dbg(&pdev->dev, "controller already in use\n");
 102                 ret = -EBUSY;
 103                 goto err_put_hcd;
 104         }
 105
 106         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 107         if (!hcd->regs) {
 108                 dev_dbg(&pdev->dev, "error mapping memory\n");
 109                 ret = -EFAULT;
 110                 goto err_release_region;
 111         }
 112
 113         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 114         if (ret)
 115                 goto err_iounmap;
 116
 117         return 0;
 118
 119  err_iounmap:
 120         iounmap(hcd->regs);
 121
 122  err_release_region:
 123         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 124  err_put_hcd:
 125         usb_put_hcd(hcd);
 126         return ret;
 127 }
 128
 129 static void ehci_ar71xx_remove(struct usb_hcd *hcd,
 130                                struct platform_device *pdev)
 131 {
 132         usb_remove_hcd(hcd);
 133         iounmap(hcd->regs);
 134         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 135         usb_put_hcd(hcd);
 136 }
 137
 138 static const struct hc_driver ehci_ar71xx_hc_driver = {
 139         .description            = hcd_name,
 140         .product_desc           = "Atheros AR71xx built-in EHCI controller",
 141         .hcd_priv_size          = sizeof(struct ehci_hcd),
 142
 143         .irq                    = ehci_irq,
 144         .flags                  = HCD_MEMORY | HCD_USB2,
 145
 146         .reset                  = ehci_ar71xx_init,
 147         .start                  = ehci_run,
 148         .stop                   = ehci_stop,
 149         .shutdown               = ehci_shutdown,
 150
 151         .urb_enqueue            = ehci_urb_enqueue,
 152         .urb_dequeue            = ehci_urb_dequeue,
 153         .endpoint_disable       = ehci_endpoint_disable,
 154
 155         .get_frame_number       = ehci_get_frame,
 156
 157         .hub_status_data        = ehci_hub_status_data,
 158         .hub_control            = ehci_hub_control,
 159 #ifdef CONFIG_PM
 160         .hub_suspend            = ehci_hub_suspend,
 161         .hub_resume             = ehci_hub_resume,
 162 #endif
 163         .relinquish_port        = ehci_relinquish_port,
 164         .port_handed_over       = ehci_port_handed_over,
 165 };
 166
 167 static const struct hc_driver ehci_ar91xx_hc_driver = {
 168         .description            = hcd_name,
 169         .product_desc           = "Atheros AR91xx built-in EHCI controller",
 170         .hcd_priv_size          = sizeof(struct ehci_hcd),
 171         .irq                    = ehci_irq,
 172         .flags                  = HCD_MEMORY | HCD_USB2,
 173
 174         .reset                  = ehci_ar91xx_init,
 175         .start                  = ehci_run,
 176         .stop                   = ehci_stop,
 177         .shutdown               = ehci_shutdown,
 178
 179         .urb_enqueue            = ehci_urb_enqueue,
 180         .urb_dequeue            = ehci_urb_dequeue,
 181         .endpoint_disable       = ehci_endpoint_disable,
 182
 183         .get_frame_number       = ehci_get_frame,
 184
 185         .hub_status_data        = ehci_hub_status_data,
 186         .hub_control            = ehci_hub_control,
 187 #ifdef CONFIG_PM
 188         .hub_suspend            = ehci_hub_suspend,
 189         .hub_resume             = ehci_hub_resume,
 190 #endif
 191         .relinquish_port        = ehci_relinquish_port,
 192         .port_handed_over       = ehci_port_handed_over,
 193 };
 194
 195 static int ehci_ar71xx_driver_probe(struct platform_device *pdev)
 196 {
 197         struct ar71xx_ehci_platform_data *pdata;
 198         struct usb_hcd *hcd = NULL;
 199         int ret;
 200
 201         if (usb_disabled())
 202                 return -ENODEV;
 203
 204         pdata = pdev->dev.platform_data;
 205         if (!pdata) {
 206                 dev_err(&pdev->dev, "no platform data specified for %s\n",
 207                         pdev->dev.bus_id);
 208                 return -ENODEV;
 209         }
 210
 211         if (pdata->is_ar91xx)
 212                 ret = ehci_ar71xx_probe(&ehci_ar91xx_hc_driver, &hcd, pdev);
 213         else
 214                 ret = ehci_ar71xx_probe(&ehci_ar71xx_hc_driver, &hcd, pdev);
 215
 216         return ret;
 217 }
 218
 219 static int ehci_ar71xx_driver_remove(struct platform_device *pdev)
 220 {
 221         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 222
 223         ehci_ar71xx_remove(hcd, pdev);
 224         return 0;
 225 }
 226
 227 MODULE_ALIAS("platform:ar71xx-ehci");
 228
 229 static struct platform_driver ehci_ar71xx_driver = {
 230         .probe          = ehci_ar71xx_driver_probe,
 231         .remove         = ehci_ar71xx_driver_remove,
 232         .driver = {
 233                 .name   = "ar71xx-ehci",
 234         }
 235 };