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