target/linux/ramips/files/drivers/usb/host/ehci-rt3883.c

   1 /*
   2  *  Bus Glue for the built-in EHCI controller of the Ralink RT3662/RT3883 SoCs
   3  *
   4  *  Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  Parts of this file are based on Ralink's 2.6.21 BSP
   7  *
   8  *  This program is free software; you can redistribute it and/or modify it
   9  *  under the terms of the GNU General Public License version 2 as published
  10  *  by the Free Software Foundation.
  11  */
  12
  13 #include <linux/platform_device.h>
  14 #include <asm/mach-ralink/rt3883.h>
  15 #include <asm/mach-ralink/rt3883_ehci_platform.h>
  16
  17 static int ehci_rt3883_init(struct usb_hcd *hcd)
  18 {
  19         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  20         int ret;
  21
  22         ehci->caps = hcd->regs;
  23         ehci->regs = hcd->regs +
  24                      HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  25         dbg_hcs_params(ehci, "reset");
  26         dbg_hcc_params(ehci, "reset");
  27
  28         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  29         ehci->sbrn = 0x20;
  30
  31         ehci_reset(ehci);
  32
  33         ret = ehci_init(hcd);
  34         if (ret)
  35                 return ret;
  36
  37         ehci_port_power(ehci, 0);
  38
  39         return 0;
  40 }
  41
  42 static const struct hc_driver ehci_rt3883_hc_driver = {
  43         .description            = hcd_name,
  44         .product_desc           = "Ralink RT3883 built-in EHCI controller",
  45         .hcd_priv_size          = sizeof(struct ehci_hcd),
  46         .irq                    = ehci_irq,
  47         .flags                  = HCD_MEMORY | HCD_USB2,
  48
  49         .reset                  = ehci_rt3883_init,
  50         .start                  = ehci_run,
  51         .stop                   = ehci_stop,
  52         .shutdown               = ehci_shutdown,
  53
  54         .urb_enqueue            = ehci_urb_enqueue,
  55         .urb_dequeue            = ehci_urb_dequeue,
  56         .endpoint_disable       = ehci_endpoint_disable,
  57         .endpoint_reset         = ehci_endpoint_reset,
  58
  59         .get_frame_number       = ehci_get_frame,
  60
  61         .hub_status_data        = ehci_hub_status_data,
  62         .hub_control            = ehci_hub_control,
  63         .relinquish_port        = ehci_relinquish_port,
  64         .port_handed_over       = ehci_port_handed_over,
  65
  66         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
  67 };
  68
  69 static int ehci_rt3883_probe(struct platform_device *pdev)
  70 {
  71         struct rt3883_ehci_platform_data *pdata;
  72         struct usb_hcd *hcd;
  73         struct resource *res;
  74         int irq;
  75         int ret;
  76
  77         if (usb_disabled())
  78                 return -ENODEV;
  79
  80         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  81         if (!res) {
  82                 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
  83                         dev_name(&pdev->dev));
  84                 return -ENODEV;
  85         }
  86         irq = res->start;
  87
  88         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  89         if (!res) {
  90                 dev_dbg(&pdev->dev, "no base address specified for %s\n",
  91                         dev_name(&pdev->dev));
  92                 return -ENODEV;
  93         }
  94
  95         hcd = usb_create_hcd(&ehci_rt3883_hc_driver, &pdev->dev,
  96                              dev_name(&pdev->dev));
  97         if (!hcd)
  98                 return -ENOMEM;
  99
 100         hcd->rsrc_start = res->start;
 101         hcd->rsrc_len   = res->end - res->start + 1;
 102
 103         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 104                 dev_dbg(&pdev->dev, "controller already in use\n");
 105                 ret = -EBUSY;
 106                 goto err_put_hcd;
 107         }
 108
 109         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 110         if (!hcd->regs) {
 111                 dev_dbg(&pdev->dev, "error mapping memory\n");
 112                 ret = -EFAULT;
 113                 goto err_release_region;
 114         }
 115
 116         pdata = pdev->dev.platform_data;
 117         if (pdata && pdata->start_hw)
 118                 pdata->start_hw();
 119
 120         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 121         if (ret)
 122                 goto err_iounmap;
 123
 124         return 0;
 125
 126 err_iounmap:
 127         iounmap(hcd->regs);
 128
 129 err_release_region:
 130         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 131 err_put_hcd:
 132         usb_put_hcd(hcd);
 133         return ret;
 134 }
 135
 136 static int ehci_rt3883_remove(struct platform_device *pdev)
 137 {
 138         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 139         struct rt3883_ehci_platform_data *pdata;
 140
 141         usb_remove_hcd(hcd);
 142         iounmap(hcd->regs);
 143         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 144         usb_put_hcd(hcd);
 145
 146         pdata = pdev->dev.platform_data;
 147         if (pdata && pdata->stop_hw)
 148                 pdata->stop_hw();
 149
 150         return 0;
 151 }
 152
 153 static struct platform_driver ehci_rt3883_driver = {
 154         .probe          = ehci_rt3883_probe,
 155         .remove         = ehci_rt3883_remove,
 156         .driver = {
 157                 .owner  = THIS_MODULE,
 158                 .name   = "rt3883-ehci",
 159         }
 160 };
 161
 162 MODULE_ALIAS("platform:rt3883-ehci");