drivers/usb/host/ehci-vt8500.c

   1 /*
   2  * drivers/usb/host/ehci-vt8500.c
   3  *
   4  * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
   5  *
   6  * Based on ehci-au1xxx.c
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/platform_device.h>
  20
  21 static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
  22 {
  23         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  24         int rc = 0;
  25
  26         if (!udev->parent) /* udev is root hub itself, impossible */
  27                 rc = -1;
  28         /* we only support lpm device connected to root hub yet */
  29         if (ehci->has_lpm && !udev->parent->parent) {
  30                 rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
  31                 if (!rc)
  32                         rc = ehci_lpm_check(ehci, udev->portnum);
  33         }
  34         return rc;
  35 }
  36
  37 static const struct hc_driver vt8500_ehci_hc_driver = {
  38         .description            = hcd_name,
  39         .product_desc           = "VT8500 EHCI",
  40         .hcd_priv_size          = sizeof(struct ehci_hcd),
  41
  42         /*
  43          * generic hardware linkage
  44          */
  45         .irq                    = ehci_irq,
  46         .flags                  = HCD_MEMORY | HCD_USB2,
  47
  48         /*
  49          * basic lifecycle operations
  50          */
  51         .reset                  = ehci_init,
  52         .start                  = ehci_run,
  53         .stop                   = ehci_stop,
  54         .shutdown               = ehci_shutdown,
  55
  56         /*
  57          * managing i/o requests and associated device resources
  58          */
  59         .urb_enqueue            = ehci_urb_enqueue,
  60         .urb_dequeue            = ehci_urb_dequeue,
  61         .endpoint_disable       = ehci_endpoint_disable,
  62         .endpoint_reset         = ehci_endpoint_reset,
  63
  64         /*
  65          * scheduling support
  66          */
  67         .get_frame_number       = ehci_get_frame,
  68
  69         /*
  70          * root hub support
  71          */
  72         .hub_status_data        = ehci_hub_status_data,
  73         .hub_control            = ehci_hub_control,
  74         .bus_suspend            = ehci_bus_suspend,
  75         .bus_resume             = ehci_bus_resume,
  76         .relinquish_port        = ehci_relinquish_port,
  77         .port_handed_over       = ehci_port_handed_over,
  78
  79         /*
  80          * call back when device connected and addressed
  81          */
  82         .update_device =        ehci_update_device,
  83
  84         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  85 };
  86
  87 static int vt8500_ehci_drv_probe(struct platform_device *pdev)
  88 {
  89         struct usb_hcd *hcd;
  90         struct ehci_hcd *ehci;
  91         struct resource *res;
  92         int ret;
  93
  94         if (usb_disabled())
  95                 return -ENODEV;
  96
  97         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
  98                 pr_debug("resource[1] is not IORESOURCE_IRQ");
  99                 return -ENOMEM;
 100         }
 101         hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
 102         if (!hcd)
 103                 return -ENOMEM;
 104
 105         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         hcd->rsrc_start = res->start;
 107         hcd->rsrc_len = resource_size(res);
 108
 109         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 110                 pr_debug("request_mem_region failed");
 111                 ret = -EBUSY;
 112                 goto err1;
 113         }
 114
 115         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 116         if (!hcd->regs) {
 117                 pr_debug("ioremap failed");
 118                 ret = -ENOMEM;
 119                 goto err2;
 120         }
 121
 122         ehci = hcd_to_ehci(hcd);
 123         ehci->caps = hcd->regs;
 124         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
 125
 126         dbg_hcs_params(ehci, "reset");
 127         dbg_hcc_params(ehci, "reset");
 128
 129         /* cache this readonly data; minimize chip reads */
 130         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 131
 132         ehci_port_power(ehci, 1);
 133
 134         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 135                           IRQF_DISABLED | IRQF_SHARED);
 136         if (ret == 0) {
 137                 platform_set_drvdata(pdev, hcd);
 138                 return ret;
 139         }
 140
 141         iounmap(hcd->regs);
 142 err2:
 143         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 144 err1:
 145         usb_put_hcd(hcd);
 146         return ret;
 147 }
 148
 149 static int vt8500_ehci_drv_remove(struct platform_device *pdev)
 150 {
 151         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 152
 153         usb_remove_hcd(hcd);
 154         iounmap(hcd->regs);
 155         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 156         usb_put_hcd(hcd);
 157         platform_set_drvdata(pdev, NULL);
 158
 159         return 0;
 160 }
 161
 162 static struct platform_driver vt8500_ehci_driver = {
 163         .probe          = vt8500_ehci_drv_probe,
 164         .remove         = vt8500_ehci_drv_remove,
 165         .shutdown       = usb_hcd_platform_shutdown,
 166         .driver = {
 167                 .name   = "vt8500-ehci",
 168                 .owner  = THIS_MODULE,
 169         }
 170 };
 171
 172 MODULE_ALIAS("platform:vt8500-ehci");