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                 .name           = "ar933x-ehci",
  37                 .driver_data    = EHCI_ATH79_IP_V2,
  38         },
  39         {
  40                 /* terminating entry */
  41         },
  42 };
  43
  44 MODULE_DEVICE_TABLE(platform, ehci_ath79_id_table);
  45
  46 static int ehci_ath79_init(struct usb_hcd *hcd)
  47 {
  48         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  49         struct platform_device *pdev = to_platform_device(hcd->self.controller);
  50         const struct platform_device_id *id;
  51         int ret;
  52
  53         id = platform_get_device_id(pdev);
  54         if (!id) {
  55                 dev_err(hcd->self.controller, "missing device id\n");
  56                 return -EINVAL;
  57         }
  58
  59         switch (id->driver_data) {
  60         case EHCI_ATH79_IP_V1:
  61                 ehci->has_synopsys_hc_bug = 1;
  62
  63                 ehci->caps = hcd->regs;
  64                 ehci->regs = hcd->regs +
  65                         HC_LENGTH(ehci,
  66                                   ehci_readl(ehci, &ehci->caps->hc_capbase));
  67                 break;
  68
  69         case EHCI_ATH79_IP_V2:
  70                 hcd->has_tt = 1;
  71
  72                 ehci->caps = hcd->regs + 0x100;
  73                 ehci->regs = hcd->regs + 0x100 +
  74                         HC_LENGTH(ehci,
  75                                   ehci_readl(ehci, &ehci->caps->hc_capbase));
  76                 break;
  77
  78         default:
  79                 BUG();
  80         }
  81
  82         dbg_hcs_params(ehci, "reset");
  83         dbg_hcc_params(ehci, "reset");
  84         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  85         ehci->sbrn = 0x20;
  86
  87         ehci_reset(ehci);
  88
  89         ret = ehci_init(hcd);
  90         if (ret)
  91                 return ret;
  92
  93         ehci_port_power(ehci, 0);
  94
  95         return 0;
  96 }
  97
  98 static const struct hc_driver ehci_ath79_hc_driver = {
  99         .description            = hcd_name,
 100         .product_desc           = "Atheros built-in EHCI controller",
 101         .hcd_priv_size          = sizeof(struct ehci_hcd),
 102         .irq                    = ehci_irq,
 103         .flags                  = HCD_MEMORY | HCD_USB2,
 104
 105         .reset                  = ehci_ath79_init,
 106         .start                  = ehci_run,
 107         .stop                   = ehci_stop,
 108         .shutdown               = ehci_shutdown,
 109
 110         .urb_enqueue            = ehci_urb_enqueue,
 111         .urb_dequeue            = ehci_urb_dequeue,
 112         .endpoint_disable       = ehci_endpoint_disable,
 113         .endpoint_reset         = ehci_endpoint_reset,
 114
 115         .get_frame_number       = ehci_get_frame,
 116
 117         .hub_status_data        = ehci_hub_status_data,
 118         .hub_control            = ehci_hub_control,
 119
 120         .relinquish_port        = ehci_relinquish_port,
 121         .port_handed_over       = ehci_port_handed_over,
 122
 123         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 124 };
 125
 126 static int ehci_ath79_probe(struct platform_device *pdev)
 127 {
 128         struct usb_hcd *hcd;
 129         struct resource *res;
 130         int irq;
 131         int ret;
 132
 133         if (usb_disabled())
 134                 return -ENODEV;
 135
 136         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 137         if (!res) {
 138                 dev_dbg(&pdev->dev, "no IRQ specified\n");
 139                 return -ENODEV;
 140         }
 141         irq = res->start;
 142
 143         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 144         if (!res) {
 145                 dev_dbg(&pdev->dev, "no base address specified\n");
 146                 return -ENODEV;
 147         }
 148
 149         hcd = usb_create_hcd(&ehci_ath79_hc_driver, &pdev->dev,
 150                              dev_name(&pdev->dev));
 151         if (!hcd)
 152                 return -ENOMEM;
 153
 154         hcd->rsrc_start = res->start;
 155         hcd->rsrc_len   = resource_size(res);
 156
 157         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 158                 dev_dbg(&pdev->dev, "controller already in use\n");
 159                 ret = -EBUSY;
 160                 goto err_put_hcd;
 161         }
 162
 163         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 164         if (!hcd->regs) {
 165                 dev_dbg(&pdev->dev, "error mapping memory\n");
 166                 ret = -EFAULT;
 167                 goto err_release_region;
 168         }
 169
 170         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 171         if (ret)
 172                 goto err_iounmap;
 173
 174         return 0;
 175
 176 err_iounmap:
 177         iounmap(hcd->regs);
 178
 179 err_release_region:
 180         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 181 err_put_hcd:
 182         usb_put_hcd(hcd);
 183         return ret;
 184 }
 185
 186 static int ehci_ath79_remove(struct platform_device *pdev)
 187 {
 188         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 189
 190         usb_remove_hcd(hcd);
 191         iounmap(hcd->regs);
 192         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 193         usb_put_hcd(hcd);
 194
 195         return 0;
 196 }
 197
 198 static struct platform_driver ehci_ath79_driver = {
 199         .probe          = ehci_ath79_probe,
 200         .remove         = ehci_ath79_remove,
 201         .id_table       = ehci_ath79_id_table,
 202         .driver = {
 203                 .owner  = THIS_MODULE,
 204                 .name   = "ath79-ehci",
 205         }
 206 };
 207
 208 MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ehci");