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 int dwc3_host_init(struct dwc3 *dwc)
  23 {
  24         struct property_entry   props[3];
  25         struct platform_device  *xhci;
  26         int                     ret, irq;
  27         struct resource         *res;
  28         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  29         int                     prop_idx = 0;
  30
  31         irq = platform_get_irq_byname(dwc3_pdev, "host");
  32         if (irq == -EPROBE_DEFER)
  33                 return irq;
  34
  35         if (irq <= 0) {
  36                 irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
  37                 if (irq == -EPROBE_DEFER)
  38                         return irq;
  39
  40                 if (irq <= 0) {
  41                         irq = platform_get_irq(dwc3_pdev, 0);
  42                         if (irq <= 0) {
  43                                 if (irq != -EPROBE_DEFER) {
  44                                         dev_err(dwc->dev,
  45                                                 "missing host IRQ\n");
  46                                 }
  47                                 if (!irq)
  48                                         irq = -EINVAL;
  49                                 return irq;
  50                         } else {
  51                                 res = platform_get_resource(dwc3_pdev,
  52                                                             IORESOURCE_IRQ, 0);
  53                         }
  54                 } else {
  55                         res = platform_get_resource_byname(dwc3_pdev,
  56                                                            IORESOURCE_IRQ,
  57                                                            "dwc_usb3");
  58                 }
  59
  60         } else {
  61                 res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
  62                                                    "host");
  63         }
  64
  65         dwc->xhci_resources[1].start = irq;
  66         dwc->xhci_resources[1].end = irq;
  67         dwc->xhci_resources[1].flags = res->flags;
  68         dwc->xhci_resources[1].name = res->name;
  69
  70         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  71         if (!xhci) {
  72                 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  73                 return -ENOMEM;
  74         }
  75
  76         dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
  77
  78         xhci->dev.parent        = dwc->dev;
  79         xhci->dev.dma_mask      = dwc->dev->dma_mask;
  80         xhci->dev.dma_parms     = dwc->dev->dma_parms;
  81
  82         dwc->xhci = xhci;
  83
  84         ret = platform_device_add_resources(xhci, dwc->xhci_resources,
  85                                                 DWC3_XHCI_RESOURCES_NUM);
  86         if (ret) {
  87                 dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
  88                 goto err1;
  89         }
  90
  91         memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
  92
  93         if (dwc->usb3_lpm_capable)
  94                 props[prop_idx++].name = "usb3-lpm-capable";
  95
  96         /**
  97          * WORKAROUND: dwc3 revisions <=3.00a have a limitation
  98          * where Port Disable command doesn't work.
  99          *
 100          * The suggested workaround is that we avoid Port Disable
 101          * completely.
 102          *
 103          * This following flag tells XHCI to do just that.
 104          */
 105         if (dwc->revision <= DWC3_REVISION_300A)
 106                 props[prop_idx++].name = "quirk-broken-port-ped";
 107
 108         if (prop_idx) {
 109                 ret = platform_device_add_properties(xhci, props);
 110                 if (ret) {
 111                         dev_err(dwc->dev, "failed to add properties to xHCI\n");
 112                         goto err1;
 113                 }
 114         }
 115
 116         phy_create_lookup(dwc->usb2_generic_phy, "usb2-phy",
 117                           dev_name(&xhci->dev));
 118         phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
 119                           dev_name(&xhci->dev));
 120
 121         ret = platform_device_add(xhci);
 122         if (ret) {
 123                 dev_err(dwc->dev, "failed to register xHCI device\n");
 124                 goto err2;
 125         }
 126
 127         return 0;
 128 err2:
 129         phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
 130                           dev_name(&xhci->dev));
 131         phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
 132                           dev_name(&xhci->dev));
 133 err1:
 134         platform_device_put(xhci);
 135         return ret;
 136 }
 137
 138 void dwc3_host_exit(struct dwc3 *dwc)
 139 {
 140         phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
 141                           dev_name(&dwc->xhci->dev));
 142         phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
 143                           dev_name(&dwc->xhci->dev));
 144         platform_device_unregister(dwc->xhci);
 145 }