drivers/usb/dwc3/host.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /**
   3  * host.c - DesignWare USB3 DRD Controller Host Glue
   4  *
   5  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
   6  *
   7  * Authors: Felipe Balbi <balbi@ti.com>,
   8  */
   9
  10 #include <linux/platform_device.h>
  11
  12 #include "core.h"
  13
  14 static int dwc3_host_get_irq(struct dwc3 *dwc)
  15 {
  16         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  17         int irq;
  18
  19         irq = platform_get_irq_byname(dwc3_pdev, "host");
  20         if (irq > 0)
  21                 goto out;
  22
  23         if (irq == -EPROBE_DEFER)
  24                 goto out;
  25
  26         irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
  27         if (irq > 0)
  28                 goto out;
  29
  30         if (irq == -EPROBE_DEFER)
  31                 goto out;
  32
  33         irq = platform_get_irq(dwc3_pdev, 0);
  34         if (irq > 0)
  35                 goto out;
  36
  37         if (irq != -EPROBE_DEFER)
  38                 dev_err(dwc->dev, "missing host IRQ\n");
  39
  40         if (!irq)
  41                 irq = -EINVAL;
  42
  43 out:
  44         return irq;
  45 }
  46
  47 int dwc3_host_init(struct dwc3 *dwc)
  48 {
  49         struct property_entry   props[4];
  50         struct platform_device  *xhci;
  51         int                     ret, irq;
  52         struct resource         *res;
  53         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  54         int                     prop_idx = 0;
  55
  56         irq = dwc3_host_get_irq(dwc);
  57         if (irq < 0)
  58                 return irq;
  59
  60         res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
  61         if (!res)
  62                 res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
  63                                 "dwc_usb3");
  64         if (!res)
  65                 res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
  66         if (!res)
  67                 return -ENOMEM;
  68
  69         dwc->xhci_resources[1].start = irq;
  70         dwc->xhci_resources[1].end = irq;
  71         dwc->xhci_resources[1].flags = res->flags;
  72         dwc->xhci_resources[1].name = res->name;
  73
  74         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  75         if (!xhci) {
  76                 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  77                 return -ENOMEM;
  78         }
  79
  80         xhci->dev.parent        = dwc->dev;
  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 err;
  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         if (dwc->usb2_lpm_disable)
  97                 props[prop_idx++].name = "usb2-lpm-disable";
  98
  99         /**
 100          * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 101          * where Port Disable command doesn't work.
 102          *
 103          * The suggested workaround is that we avoid Port Disable
 104          * completely.
 105          *
 106          * This following flag tells XHCI to do just that.
 107          */
 108         if (dwc->revision <= DWC3_REVISION_300A)
 109                 props[prop_idx++].name = "quirk-broken-port-ped";
 110
 111         if (prop_idx) {
 112                 ret = platform_device_add_properties(xhci, props);
 113                 if (ret) {
 114                         dev_err(dwc->dev, "failed to add properties to xHCI\n");
 115                         goto err;
 116                 }
 117         }
 118
 119         ret = platform_device_add(xhci);
 120         if (ret) {
 121                 dev_err(dwc->dev, "failed to register xHCI device\n");
 122                 goto err;
 123         }
 124
 125         return 0;
 126 err:
 127         platform_device_put(xhci);
 128         return ret;
 129 }
 130
 131 void dwc3_host_exit(struct dwc3 *dwc)
 132 {
 133         platform_device_unregister(dwc->xhci);
 134 }