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 - https://www.ti.com
   6  *
   7  * Authors: Felipe Balbi <balbi@ti.com>,
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/usb.h>
  13 #include <linux/usb/hcd.h>
  14
  15 #include "../host/xhci-plat.h"
  16 #include "core.h"
  17
  18 static void dwc3_xhci_plat_start(struct usb_hcd *hcd)
  19 {
  20         struct platform_device *pdev;
  21         struct dwc3 *dwc;
  22
  23         if (!usb_hcd_is_primary_hcd(hcd))
  24                 return;
  25
  26         pdev = to_platform_device(hcd->self.controller);
  27         dwc = dev_get_drvdata(pdev->dev.parent);
  28
  29         dwc3_enable_susphy(dwc, true);
  30 }
  31
  32 static const struct xhci_plat_priv dwc3_xhci_plat_quirk = {
  33         .plat_start = dwc3_xhci_plat_start,
  34 };
  35
  36 static int dwc3_host_get_irq(struct dwc3 *dwc)
  37 {
  38         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  39         int irq;
  40
  41         irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
  42         if (irq > 0)
  43                 goto out;
  44
  45         if (irq == -EPROBE_DEFER)
  46                 goto out;
  47
  48         irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
  49         if (irq > 0)
  50                 goto out;
  51
  52         if (irq == -EPROBE_DEFER)
  53                 goto out;
  54
  55         irq = platform_get_irq(dwc3_pdev, 0);
  56         if (irq > 0)
  57                 goto out;
  58
  59         if (!irq)
  60                 irq = -EINVAL;
  61
  62 out:
  63         return irq;
  64 }
  65
  66 int dwc3_host_init(struct dwc3 *dwc)
  67 {
  68         struct property_entry   props[4];
  69         struct platform_device  *xhci;
  70         int                     ret, irq;
  71         struct resource         *res;
  72         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  73         int                     prop_idx = 0;
  74
  75         irq = dwc3_host_get_irq(dwc);
  76         if (irq < 0)
  77                 return irq;
  78
  79         res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
  80         if (!res)
  81                 res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
  82                                 "dwc_usb3");
  83         if (!res)
  84                 res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
  85         if (!res)
  86                 return -ENOMEM;
  87
  88         dwc->xhci_resources[1].start = irq;
  89         dwc->xhci_resources[1].end = irq;
  90         dwc->xhci_resources[1].flags = res->flags;
  91         dwc->xhci_resources[1].name = res->name;
  92
  93         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  94         if (!xhci) {
  95                 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  96                 return -ENOMEM;
  97         }
  98
  99         xhci->dev.parent        = dwc->dev;
 100         ACPI_COMPANION_SET(&xhci->dev, ACPI_COMPANION(dwc->dev));
 101
 102         dwc->xhci = xhci;
 103
 104         ret = platform_device_add_resources(xhci, dwc->xhci_resources,
 105                                                 DWC3_XHCI_RESOURCES_NUM);
 106         if (ret) {
 107                 dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
 108                 goto err;
 109         }
 110
 111         memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
 112
 113         if (dwc->usb3_lpm_capable)
 114                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
 115
 116         if (dwc->usb2_lpm_disable)
 117                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
 118
 119         /**
 120          * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 121          * where Port Disable command doesn't work.
 122          *
 123          * The suggested workaround is that we avoid Port Disable
 124          * completely.
 125          *
 126          * This following flag tells XHCI to do just that.
 127          */
 128         if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
 129                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
 130
 131         if (prop_idx) {
 132                 ret = platform_device_add_properties(xhci, props);
 133                 if (ret) {
 134                         dev_err(dwc->dev, "failed to add properties to xHCI\n");
 135                         goto err;
 136                 }
 137         }
 138
 139         ret = platform_device_add_data(xhci, &dwc3_xhci_plat_quirk,
 140                                        sizeof(struct xhci_plat_priv));
 141         if (ret)
 142                 goto err;
 143
 144         ret = platform_device_add(xhci);
 145         if (ret) {
 146                 dev_err(dwc->dev, "failed to register xHCI device\n");
 147                 goto err;
 148         }
 149
 150         return 0;
 151 err:
 152         platform_device_put(xhci);
 153         return ret;
 154 }
 155
 156 void dwc3_host_exit(struct dwc3 *dwc)
 157 {
 158         dwc3_enable_susphy(dwc, false);
 159         platform_device_unregister(dwc->xhci);
 160         dwc->xhci = NULL;
 161 }