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/irq.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14
  15 #include "core.h"
  16
  17 static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
  18                                         int irq, char *name)
  19 {
  20         struct platform_device *pdev = to_platform_device(dwc->dev);
  21         struct device_node *np = dev_of_node(&pdev->dev);
  22
  23         dwc->xhci_resources[1].start = irq;
  24         dwc->xhci_resources[1].end = irq;
  25         dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
  26         if (!name && np)
  27                 dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node);
  28         else
  29                 dwc->xhci_resources[1].name = name;
  30 }
  31
  32 static int dwc3_host_get_irq(struct dwc3 *dwc)
  33 {
  34         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  35         int irq;
  36
  37         irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
  38         if (irq > 0) {
  39                 dwc3_host_fill_xhci_irq_res(dwc, irq, "host");
  40                 goto out;
  41         }
  42
  43         if (irq == -EPROBE_DEFER)
  44                 goto out;
  45
  46         irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
  47         if (irq > 0) {
  48                 dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3");
  49                 goto out;
  50         }
  51
  52         if (irq == -EPROBE_DEFER)
  53                 goto out;
  54
  55         irq = platform_get_irq(dwc3_pdev, 0);
  56         if (irq > 0) {
  57                 dwc3_host_fill_xhci_irq_res(dwc, irq, NULL);
  58                 goto out;
  59         }
  60
  61         if (!irq)
  62                 irq = -EINVAL;
  63
  64 out:
  65         return irq;
  66 }
  67
  68 int dwc3_host_init(struct dwc3 *dwc)
  69 {
  70         struct property_entry   props[4];
  71         struct platform_device  *xhci;
  72         int                     ret, irq;
  73         int                     prop_idx = 0;
  74
  75         irq = dwc3_host_get_irq(dwc);
  76         if (irq < 0)
  77                 return irq;
  78
  79         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  80         if (!xhci) {
  81                 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  82                 return -ENOMEM;
  83         }
  84
  85         xhci->dev.parent        = dwc->dev;
  86         ACPI_COMPANION_SET(&xhci->dev, ACPI_COMPANION(dwc->dev));
  87
  88         dwc->xhci = xhci;
  89
  90         ret = platform_device_add_resources(xhci, dwc->xhci_resources,
  91                                                 DWC3_XHCI_RESOURCES_NUM);
  92         if (ret) {
  93                 dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
  94                 goto err;
  95         }
  96
  97         memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
  98
  99         if (dwc->usb3_lpm_capable)
 100                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
 101
 102         if (dwc->usb2_lpm_disable)
 103                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
 104
 105         /**
 106          * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 107          * where Port Disable command doesn't work.
 108          *
 109          * The suggested workaround is that we avoid Port Disable
 110          * completely.
 111          *
 112          * This following flag tells XHCI to do just that.
 113          */
 114         if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
 115                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
 116
 117         if (prop_idx) {
 118                 ret = device_create_managed_software_node(&xhci->dev, props, NULL);
 119                 if (ret) {
 120                         dev_err(dwc->dev, "failed to add properties to xHCI\n");
 121                         goto err;
 122                 }
 123         }
 124
 125         ret = platform_device_add(xhci);
 126         if (ret) {
 127                 dev_err(dwc->dev, "failed to register xHCI device\n");
 128                 goto err;
 129         }
 130
 131         return 0;
 132 err:
 133         platform_device_put(xhci);
 134         return ret;
 135 }
 136
 137 void dwc3_host_exit(struct dwc3 *dwc)
 138 {
 139         platform_device_unregister(dwc->xhci);
 140 }