drivers/usb/host/ehci-ath79.c

   1 /*
   2  *  Bus Glue for Atheros AR7XXX/AR9XXX built-in EHCI controller.
   3  *
   4  *  Copyright (C) 2008-2011 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
  17 enum {
  18         EHCI_ATH79_IP_V1 = 0,
  19         EHCI_ATH79_IP_V2,
  20 };
  21
  22 static const struct platform_device_id ehci_ath79_id_table[] = {
  23         {
  24                 .name           = "ar71xx-ehci",
  25                 .driver_data    = EHCI_ATH79_IP_V1,
  26         },
  27         {
  28                 .name           = "ar724x-ehci",
  29                 .driver_data    = EHCI_ATH79_IP_V2,
  30         },
  31         {
  32                 .name           = "ar913x-ehci",
  33                 .driver_data    = EHCI_ATH79_IP_V2,
  34         },
  35         {
  36                 /* terminating entry */
  37         },
  38 };
  39
  40 MODULE_DEVICE_TABLE(platform, ehci_ath79_id_table);
  41
  42 static int ehci_ath79_init(struct usb_hcd *hcd)
  43 {
  44         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  45         struct platform_device *pdev = to_platform_device(hcd->self.controller);
  46         const struct platform_device_id *id;
  47         int hclength;
  48         int ret;
  49
  50         id = platform_get_device_id(pdev);
  51         if (!id) {
  52                 dev_err(hcd->self.controller, "missing device id\n");
  53                 return -EINVAL;
  54         }
  55
  56         hclength = HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  57         switch (id->driver_data) {
  58         case EHCI_ATH79_IP_V1:
  59                 ehci->has_synopsys_hc_bug = 1;
  60
  61                 ehci->caps = hcd->regs;
  62                 ehci->regs = hcd->regs + hclength;
  63                 break;
  64
  65         case EHCI_ATH79_IP_V2:
  66                 hcd->has_tt = 1;
  67
  68                 ehci->caps = hcd->regs + 0x100;
  69                 ehci->regs = hcd->regs + 0x100 + hclength;
  70                 break;
  71
  72         default:
  73                 BUG();
  74         }
  75
  76         dbg_hcs_params(ehci, "reset");
  77         dbg_hcc_params(ehci, "reset");
  78         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  79         ehci->sbrn = 0x20;
  80
  81         ehci_reset(ehci);
  82
  83         ret = ehci_init(hcd);
  84         if (ret)
  85                 return ret;
  86
  87         ehci_port_power(ehci, 0);
  88
  89         return 0;
  90 }
  91
  92 static const struct hc_driver ehci_ath79_hc_driver = {
  93         .description            = hcd_name,
  94         .product_desc           = "Atheros built-in EHCI controller",
  95         .hcd_priv_size          = sizeof(struct ehci_hcd),
  96         .irq                    = ehci_irq,
  97         .flags                  = HCD_MEMORY | HCD_USB2,
  98
  99         .reset                  = ehci_ath79_init,
 100         .start                  = ehci_run,
 101         .stop                   = ehci_stop,
 102         .shutdown               = ehci_shutdown,
 103
 104         .urb_enqueue            = ehci_urb_enqueue,
 105         .urb_dequeue            = ehci_urb_dequeue,
 106         .endpoint_disable       = ehci_endpoint_disable,
 107         .endpoint_reset         = ehci_endpoint_reset,
 108
 109         .get_frame_number       = ehci_get_frame,
 110
 111         .hub_status_data        = ehci_hub_status_data,
 112         .hub_control            = ehci_hub_control,
 113
 114         .relinquish_port        = ehci_relinquish_port,
 115         .port_handed_over       = ehci_port_handed_over,
 116
 117         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 118 };
 119
 120 static int ehci_ath79_probe(struct platform_device *pdev)
 121 {
 122         struct usb_hcd *hcd;
 123         struct resource *res;
 124         int irq;
 125         int ret;
 126
 127         if (usb_disabled())
 128                 return -ENODEV;
 129
 130         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 131         if (!res) {
 132                 dev_dbg(&pdev->dev, "no IRQ specified\n");
 133                 return -ENODEV;
 134         }
 135         irq = res->start;
 136
 137         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 138         if (!res) {
 139                 dev_dbg(&pdev->dev, "no base address specified\n");
 140                 return -ENODEV;
 141         }
 142
 143         hcd = usb_create_hcd(&ehci_ath79_hc_driver, &pdev->dev,
 144                              dev_name(&pdev->dev));
 145         if (!hcd)
 146                 return -ENOMEM;
 147
 148         hcd->rsrc_start = res->start;
 149         hcd->rsrc_len   = res->end - res->start + 1;
 150
 151         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 152                 dev_dbg(&pdev->dev, "controller already in use\n");
 153                 ret = -EBUSY;
 154                 goto err_put_hcd;
 155         }
 156
 157         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 158         if (!hcd->regs) {
 159                 dev_dbg(&pdev->dev, "error mapping memory\n");
 160                 ret = -EFAULT;
 161                 goto err_release_region;
 162         }
 163
 164         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 165         if (ret)
 166                 goto err_iounmap;
 167
 168         return 0;
 169
 170 err_iounmap:
 171         iounmap(hcd->regs);
 172
 173 err_release_region:
 174         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 175 err_put_hcd:
 176         usb_put_hcd(hcd);
 177         return ret;
 178 }
 179
 180 static int ehci_ath79_remove(struct platform_device *pdev)
 181 {
 182         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 183
 184         usb_remove_hcd(hcd);
 185         iounmap(hcd->regs);
 186         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 187         usb_put_hcd(hcd);
 188
 189         return 0;
 190 }
 191
 192 static struct platform_driver ehci_ath79_driver = {
 193         .probe          = ehci_ath79_probe,
 194         .remove         = ehci_ath79_remove,
 195         .id_table       = ehci_ath79_id_table,
 196         .driver = {
 197                 .owner  = THIS_MODULE,
 198                 .name   = "ath79-ehci",
 199         }
 200 };
 201
 202 MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ehci");