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 ret;
  48
  49         id = platform_get_device_id(pdev);
  50         if (!id) {
  51                 dev_err(hcd->self.controller, "missing device id\n");
  52                 return -EINVAL;
  53         }
  54
  55         switch (id->driver_data) {
  56         case EHCI_ATH79_IP_V1:
  57                 ehci->has_synopsys_hc_bug = 1;
  58
  59                 ehci->caps = hcd->regs;
  60                 ehci->regs = hcd->regs +
  61                         HC_LENGTH(ehci,
  62                                   ehci_readl(ehci, &ehci->caps->hc_capbase));
  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 +
  70                         HC_LENGTH(ehci,
  71                                   ehci_readl(ehci, &ehci->caps->hc_capbase));
  72                 break;
  73
  74         default:
  75                 BUG();
  76         }
  77
  78         dbg_hcs_params(ehci, "reset");
  79         dbg_hcc_params(ehci, "reset");
  80         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  81         ehci->sbrn = 0x20;
  82
  83         ehci_reset(ehci);
  84
  85         ret = ehci_init(hcd);
  86         if (ret)
  87                 return ret;
  88
  89         ehci_port_power(ehci, 0);
  90
  91         return 0;
  92 }
  93
  94 static const struct hc_driver ehci_ath79_hc_driver = {
  95         .description            = hcd_name,
  96         .product_desc           = "Atheros built-in EHCI controller",
  97         .hcd_priv_size          = sizeof(struct ehci_hcd),
  98         .irq                    = ehci_irq,
  99         .flags                  = HCD_MEMORY | HCD_USB2,
 100
 101         .reset                  = ehci_ath79_init,
 102         .start                  = ehci_run,
 103         .stop                   = ehci_stop,
 104         .shutdown               = ehci_shutdown,
 105
 106         .urb_enqueue            = ehci_urb_enqueue,
 107         .urb_dequeue            = ehci_urb_dequeue,
 108         .endpoint_disable       = ehci_endpoint_disable,
 109         .endpoint_reset         = ehci_endpoint_reset,
 110
 111         .get_frame_number       = ehci_get_frame,
 112
 113         .hub_status_data        = ehci_hub_status_data,
 114         .hub_control            = ehci_hub_control,
 115
 116         .relinquish_port        = ehci_relinquish_port,
 117         .port_handed_over       = ehci_port_handed_over,
 118
 119         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 120 };
 121
 122 static int ehci_ath79_probe(struct platform_device *pdev)
 123 {
 124         struct usb_hcd *hcd;
 125         struct resource *res;
 126         int irq;
 127         int ret;
 128
 129         if (usb_disabled())
 130                 return -ENODEV;
 131
 132         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 133         if (!res) {
 134                 dev_dbg(&pdev->dev, "no IRQ specified\n");
 135                 return -ENODEV;
 136         }
 137         irq = res->start;
 138
 139         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 140         if (!res) {
 141                 dev_dbg(&pdev->dev, "no base address specified\n");
 142                 return -ENODEV;
 143         }
 144
 145         hcd = usb_create_hcd(&ehci_ath79_hc_driver, &pdev->dev,
 146                              dev_name(&pdev->dev));
 147         if (!hcd)
 148                 return -ENOMEM;
 149
 150         hcd->rsrc_start = res->start;
 151         hcd->rsrc_len   = resource_size(res);
 152
 153         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 154                 dev_dbg(&pdev->dev, "controller already in use\n");
 155                 ret = -EBUSY;
 156                 goto err_put_hcd;
 157         }
 158
 159         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 160         if (!hcd->regs) {
 161                 dev_dbg(&pdev->dev, "error mapping memory\n");
 162                 ret = -EFAULT;
 163                 goto err_release_region;
 164         }
 165
 166         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 167         if (ret)
 168                 goto err_iounmap;
 169
 170         return 0;
 171
 172 err_iounmap:
 173         iounmap(hcd->regs);
 174
 175 err_release_region:
 176         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 177 err_put_hcd:
 178         usb_put_hcd(hcd);
 179         return ret;
 180 }
 181
 182 static int ehci_ath79_remove(struct platform_device *pdev)
 183 {
 184         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 185
 186         usb_remove_hcd(hcd);
 187         iounmap(hcd->regs);
 188         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 189         usb_put_hcd(hcd);
 190
 191         return 0;
 192 }
 193
 194 static struct platform_driver ehci_ath79_driver = {
 195         .probe          = ehci_ath79_probe,
 196         .remove         = ehci_ath79_remove,
 197         .id_table       = ehci_ath79_id_table,
 198         .driver = {
 199                 .owner  = THIS_MODULE,
 200                 .name   = "ath79-ehci",
 201         }
 202 };
 203
 204 MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ehci");