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) 2008-2010 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         ehci->has_synopsys_hc_bug = 1;
  34
  35         ehci_reset(ehci);
  36
  37         ret = ehci_init(hcd);
  38         if (ret)
  39                 return ret;
  40
  41         ehci_port_power(ehci, 0);
  42
  43         return 0;
  44 }
  45
  46 static int ehci_ar91xx_init(struct usb_hcd *hcd)
  47 {
  48         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  49         int ret;
  50
  51         ehci->caps = hcd->regs + 0x100;
  52         ehci->regs = hcd->regs + 0x100 +
  53                         HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  54         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  55
  56         hcd->has_tt = 1;
  57         ehci->sbrn = 0x20;
  58
  59         ehci_reset(ehci);
  60
  61         ret = ehci_init(hcd);
  62         if (ret)
  63                 return ret;
  64
  65         ehci_port_power(ehci, 0);
  66
  67         return 0;
  68 }
  69
  70 static int ehci_ar71xx_probe(const struct hc_driver *driver,
  71                              struct usb_hcd **hcd_out,
  72                              struct platform_device *pdev)
  73 {
  74         struct usb_hcd *hcd;
  75         struct resource *res;
  76         int irq;
  77         int ret;
  78
  79         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  80         if (!res) {
  81                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  82                         dev_name(&pdev->dev));
  83                 return -ENODEV;
  84         }
  85         irq = res->start;
  86
  87         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  88         if (!res) {
  89                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  90                         dev_name(&pdev->dev));
  91                 return -ENODEV;
  92         }
  93
  94         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  95         if (!hcd)
  96                 return -ENOMEM;
  97
  98         hcd->rsrc_start = res->start;
  99         hcd->rsrc_len   = res->end - res->start + 1;
 100
 101         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 102                 dev_dbg(&pdev->dev, "controller already in use\n");
 103                 ret = -EBUSY;
 104                 goto err_put_hcd;
 105         }
 106
 107         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 108         if (!hcd->regs) {
 109                 dev_dbg(&pdev->dev, "error mapping memory\n");
 110                 ret = -EFAULT;
 111                 goto err_release_region;
 112         }
 113
 114         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 115         if (ret)
 116                 goto err_iounmap;
 117
 118         return 0;
 119
 120 err_iounmap:
 121         iounmap(hcd->regs);
 122
 123 err_release_region:
 124         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 125 err_put_hcd:
 126         usb_put_hcd(hcd);
 127         return ret;
 128 }
 129
 130 static void ehci_ar71xx_remove(struct usb_hcd *hcd,
 131                                struct platform_device *pdev)
 132 {
 133         usb_remove_hcd(hcd);
 134         iounmap(hcd->regs);
 135         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 136         usb_put_hcd(hcd);
 137 }
 138
 139 static const struct hc_driver ehci_ar71xx_hc_driver = {
 140         .description            = hcd_name,
 141         .product_desc           = "Atheros AR71xx built-in EHCI controller",
 142         .hcd_priv_size          = sizeof(struct ehci_hcd),
 143
 144         .irq                    = ehci_irq,
 145         .flags                  = HCD_MEMORY | HCD_USB2,
 146
 147         .reset                  = ehci_ar71xx_init,
 148         .start                  = ehci_run,
 149         .stop                   = ehci_stop,
 150         .shutdown               = ehci_shutdown,
 151
 152         .urb_enqueue            = ehci_urb_enqueue,
 153         .urb_dequeue            = ehci_urb_dequeue,
 154         .endpoint_disable       = ehci_endpoint_disable,
 155         .endpoint_reset         = ehci_endpoint_reset,
 156
 157         .get_frame_number       = ehci_get_frame,
 158
 159         .hub_status_data        = ehci_hub_status_data,
 160         .hub_control            = ehci_hub_control,
 161 #ifdef CONFIG_PM
 162         .hub_suspend            = ehci_hub_suspend,
 163         .hub_resume             = ehci_hub_resume,
 164 #endif
 165         .relinquish_port        = ehci_relinquish_port,
 166         .port_handed_over       = ehci_port_handed_over,
 167
 168         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 169 };
 170
 171 static const struct hc_driver ehci_ar91xx_hc_driver = {
 172         .description            = hcd_name,
 173         .product_desc           = "Atheros AR91xx built-in EHCI controller",
 174         .hcd_priv_size          = sizeof(struct ehci_hcd),
 175         .irq                    = ehci_irq,
 176         .flags                  = HCD_MEMORY | HCD_USB2,
 177
 178         .reset                  = ehci_ar91xx_init,
 179         .start                  = ehci_run,
 180         .stop                   = ehci_stop,
 181         .shutdown               = ehci_shutdown,
 182
 183         .urb_enqueue            = ehci_urb_enqueue,
 184         .urb_dequeue            = ehci_urb_dequeue,
 185         .endpoint_disable       = ehci_endpoint_disable,
 186         .endpoint_reset         = ehci_endpoint_reset,
 187
 188         .get_frame_number       = ehci_get_frame,
 189
 190         .hub_status_data        = ehci_hub_status_data,
 191         .hub_control            = ehci_hub_control,
 192 #ifdef CONFIG_PM
 193         .hub_suspend            = ehci_hub_suspend,
 194         .hub_resume             = ehci_hub_resume,
 195 #endif
 196         .relinquish_port        = ehci_relinquish_port,
 197         .port_handed_over       = ehci_port_handed_over,
 198
 199         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 200 };
 201
 202 static int ehci_ar71xx_driver_probe(struct platform_device *pdev)
 203 {
 204         struct ar71xx_ehci_platform_data *pdata;
 205         struct usb_hcd *hcd = NULL;
 206         int ret;
 207
 208         if (usb_disabled())
 209                 return -ENODEV;
 210
 211         pdata = pdev->dev.platform_data;
 212         if (!pdata) {
 213                 dev_err(&pdev->dev, "no platform data specified for %s\n",
 214                         dev_name(&pdev->dev));
 215                 return -ENODEV;
 216         }
 217
 218         if (pdata->is_ar91xx)
 219                 ret = ehci_ar71xx_probe(&ehci_ar91xx_hc_driver, &hcd, pdev);
 220         else
 221                 ret = ehci_ar71xx_probe(&ehci_ar71xx_hc_driver, &hcd, pdev);
 222
 223         return ret;
 224 }
 225
 226 static int ehci_ar71xx_driver_remove(struct platform_device *pdev)
 227 {
 228         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 229
 230         ehci_ar71xx_remove(hcd, pdev);
 231         return 0;
 232 }
 233
 234 MODULE_ALIAS("platform:ar71xx-ehci");
 235
 236 static struct platform_driver ehci_ar71xx_driver = {
 237         .probe          = ehci_ar71xx_driver_probe,
 238         .remove         = ehci_ar71xx_driver_remove,
 239         .driver = {
 240                 .name   = "ar71xx-ehci",
 241         }
 242 };