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/of.h>
  20 #include <linux/platform_device.h>
  21
  22 static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
  23 {
  24         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  25         int rc = 0;
  26
  27         if (!udev->parent) /* udev is root hub itself, impossible */
  28                 rc = -1;
  29         /* we only support lpm device connected to root hub yet */
  30         if (ehci->has_lpm && !udev->parent->parent) {
  31                 rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
  32                 if (!rc)
  33                         rc = ehci_lpm_check(ehci, udev->portnum);
  34         }
  35         return rc;
  36 }
  37
  38 static const struct hc_driver vt8500_ehci_hc_driver = {
  39         .description            = hcd_name,
  40         .product_desc           = "VT8500 EHCI",
  41         .hcd_priv_size          = sizeof(struct ehci_hcd),
  42
  43         /*
  44          * generic hardware linkage
  45          */
  46         .irq                    = ehci_irq,
  47         .flags                  = HCD_MEMORY | HCD_USB2,
  48
  49         /*
  50          * basic lifecycle operations
  51          */
  52         .reset                  = ehci_setup,
  53         .start                  = ehci_run,
  54         .stop                   = ehci_stop,
  55         .shutdown               = ehci_shutdown,
  56
  57         /*
  58          * managing i/o requests and associated device resources
  59          */
  60         .urb_enqueue            = ehci_urb_enqueue,
  61         .urb_dequeue            = ehci_urb_dequeue,
  62         .endpoint_disable       = ehci_endpoint_disable,
  63         .endpoint_reset         = ehci_endpoint_reset,
  64
  65         /*
  66          * scheduling support
  67          */
  68         .get_frame_number       = ehci_get_frame,
  69
  70         /*
  71          * root hub support
  72          */
  73         .hub_status_data        = ehci_hub_status_data,
  74         .hub_control            = ehci_hub_control,
  75         .bus_suspend            = ehci_bus_suspend,
  76         .bus_resume             = ehci_bus_resume,
  77         .relinquish_port        = ehci_relinquish_port,
  78         .port_handed_over       = ehci_port_handed_over,
  79
  80         /*
  81          * call back when device connected and addressed
  82          */
  83         .update_device =        ehci_update_device,
  84
  85         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  86 };
  87
  88 static u64 vt8500_ehci_dma_mask = DMA_BIT_MASK(32);
  89
  90 static int vt8500_ehci_drv_probe(struct platform_device *pdev)
  91 {
  92         struct usb_hcd *hcd;
  93         struct ehci_hcd *ehci;
  94         struct resource *res;
  95         int ret;
  96
  97         if (usb_disabled())
  98                 return -ENODEV;
  99
 100         /*
 101          * Right now device-tree probed devices don't get dma_mask set.
 102          * Since shared usb code relies on it, set it here for now.
 103          * Once we have dma capability bindings this can go away.
 104          */
 105         if (!pdev->dev.dma_mask)
 106                 pdev->dev.dma_mask = &vt8500_ehci_dma_mask;
 107
 108         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 109                 pr_debug("resource[1] is not IORESOURCE_IRQ");
 110                 return -ENOMEM;
 111         }
 112         hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
 113         if (!hcd)
 114                 return -ENOMEM;
 115
 116         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 117         hcd->rsrc_start = res->start;
 118         hcd->rsrc_len = resource_size(res);
 119
 120         hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
 121         if (!hcd->regs) {
 122                 pr_debug("ioremap failed");
 123                 ret = -ENOMEM;
 124                 goto err1;
 125         }
 126
 127         ehci = hcd_to_ehci(hcd);
 128         ehci->caps = hcd->regs;
 129
 130         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 131                           IRQF_SHARED);
 132         if (ret == 0) {
 133                 platform_set_drvdata(pdev, hcd);
 134                 return ret;
 135         }
 136
 137 err1:
 138         usb_put_hcd(hcd);
 139         return ret;
 140 }
 141
 142 static int vt8500_ehci_drv_remove(struct platform_device *pdev)
 143 {
 144         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 145
 146         usb_remove_hcd(hcd);
 147         usb_put_hcd(hcd);
 148         platform_set_drvdata(pdev, NULL);
 149
 150         return 0;
 151 }
 152
 153 static const struct of_device_id vt8500_ehci_ids[] = {
 154         { .compatible = "via,vt8500-ehci", },
 155         { .compatible = "wm,prizm-ehci", },
 156         {}
 157 };
 158
 159 static struct platform_driver vt8500_ehci_driver = {
 160         .probe          = vt8500_ehci_drv_probe,
 161         .remove         = vt8500_ehci_drv_remove,
 162         .shutdown       = usb_hcd_platform_shutdown,
 163         .driver = {
 164                 .name   = "vt8500-ehci",
 165                 .owner  = THIS_MODULE,
 166                 .of_match_table = of_match_ptr(vt8500_ehci_ids),
 167         }
 168 };
 169
 170 MODULE_ALIAS("platform:vt8500-ehci");
 171 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);