drivers/usb/dwc3/host.c

   1 /**
   2  * host.c - DesignWare USB3 DRD Controller Host Glue
   3  *
   4  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
   5  *
   6  * Authors: Felipe Balbi <balbi@ti.com>,
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2  of
  10  * the License as published by the Free Software Foundation.
  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 #include <linux/platform_device.h>
  19
  20 #include "core.h"
  21
  22 static int dwc3_host_get_irq(struct dwc3 *dwc)
  23 {
  24         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  25         int irq;
  26
  27         irq = platform_get_irq_byname(dwc3_pdev, "host");
  28         if (irq > 0)
  29                 goto out;
  30
  31         if (irq == -EPROBE_DEFER)
  32                 goto out;
  33
  34         irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
  35         if (irq > 0)
  36                 goto out;
  37
  38         if (irq == -EPROBE_DEFER)
  39                 goto out;
  40
  41         irq = platform_get_irq(dwc3_pdev, 0);
  42         if (irq > 0)
  43                 goto out;
  44
  45         if (irq != -EPROBE_DEFER)
  46                 dev_err(dwc->dev, "missing host IRQ\n");
  47
  48         if (!irq)
  49                 irq = -EINVAL;
  50
  51 out:
  52         return irq;
  53 }
  54
  55 int dwc3_host_init(struct dwc3 *dwc)
  56 {
  57         struct property_entry   props[3];
  58         struct platform_device  *xhci;
  59         int                     ret, irq;
  60         struct resource         *res;
  61         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  62         int                     prop_idx = 0;
  63
  64         irq = dwc3_host_get_irq(dwc);
  65         if (irq < 0)
  66                 return irq;
  67
  68         res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
  69         if (!res)
  70                 res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
  71                                 "dwc_usb3");
  72         if (!res)
  73                 res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
  74         if (!res)
  75                 return -ENOMEM;
  76
  77         dwc->xhci_resources[1].start = irq;
  78         dwc->xhci_resources[1].end = irq;
  79         dwc->xhci_resources[1].flags = res->flags;
  80         dwc->xhci_resources[1].name = res->name;
  81
  82         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  83         if (!xhci) {
  84                 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  85                 return -ENOMEM;
  86         }
  87
  88         xhci->dev.parent        = dwc->dev;
  89
  90         dwc->xhci = xhci;
  91
  92         ret = platform_device_add_resources(xhci, dwc->xhci_resources,
  93                                                 DWC3_XHCI_RESOURCES_NUM);
  94         if (ret) {
  95                 dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
  96                 goto err1;
  97         }
  98
  99         memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
 100
 101         if (dwc->usb3_lpm_capable)
 102                 props[prop_idx++].name = "usb3-lpm-capable";
 103
 104         /**
 105          * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 106          * where Port Disable command doesn't work.
 107          *
 108          * The suggested workaround is that we avoid Port Disable
 109          * completely.
 110          *
 111          * This following flag tells XHCI to do just that.
 112          */
 113         if (dwc->revision <= DWC3_REVISION_300A)
 114                 props[prop_idx++].name = "quirk-broken-port-ped";
 115
 116         if (prop_idx) {
 117                 ret = platform_device_add_properties(xhci, props);
 118                 if (ret) {
 119                         dev_err(dwc->dev, "failed to add properties to xHCI\n");
 120                         goto err1;
 121                 }
 122         }
 123
 124         phy_create_lookup(dwc->usb2_generic_phy, "usb2-phy",
 125                           dev_name(dwc->dev));
 126         phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
 127                           dev_name(dwc->dev));
 128
 129         ret = platform_device_add(xhci);
 130         if (ret) {
 131                 dev_err(dwc->dev, "failed to register xHCI device\n");
 132                 goto err2;
 133         }
 134
 135         return 0;
 136 err2:
 137         phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
 138                           dev_name(dwc->dev));
 139         phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
 140                           dev_name(dwc->dev));
 141 err1:
 142         platform_device_put(xhci);
 143         return ret;
 144 }
 145
 146 void dwc3_host_exit(struct dwc3 *dwc)
 147 {
 148         phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
 149                           dev_name(dwc->dev));
 150         phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
 151                           dev_name(dwc->dev));
 152         platform_device_unregister(dwc->xhci);
 153 }