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 <[email protected]>,
   8  */
   9
  10 #include <linux/irq.h>
  11 #include <linux/of.h>
  12 #include <linux/platform_device.h>
  13
  14 #include "core.h"
  15
  16 static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
  17                                         int irq, char *name)
  18 {
  19         struct platform_device *pdev = to_platform_device(dwc->dev);
  20         struct device_node *np = dev_of_node(&pdev->dev);
  21
  22         dwc->xhci_resources[1].start = irq;
  23         dwc->xhci_resources[1].end = irq;
  24         dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
  25         if (!name && np)
  26                 dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node);
  27         else
  28                 dwc->xhci_resources[1].name = name;
  29 }
  30
  31 static int dwc3_host_get_irq(struct dwc3 *dwc)
  32 {
  33         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  34         int irq;
  35
  36         irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
  37         if (irq > 0) {
  38                 dwc3_host_fill_xhci_irq_res(dwc, irq, "host");
  39                 goto out;
  40         }
  41
  42         if (irq == -EPROBE_DEFER)
  43                 goto out;
  44
  45         irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
  46         if (irq > 0) {
  47                 dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3");
  48                 goto out;
  49         }
  50
  51         if (irq == -EPROBE_DEFER)
  52                 goto out;
  53
  54         irq = platform_get_irq(dwc3_pdev, 0);
  55         if (irq > 0)
  56                 dwc3_host_fill_xhci_irq_res(dwc, irq, NULL);
  57
  58 out:
  59         return irq;
  60 }
  61
  62 int dwc3_host_init(struct dwc3 *dwc)
  63 {
  64         struct property_entry   props[4];
  65         struct platform_device  *xhci;
  66         int                     ret, irq;
  67         int                     prop_idx = 0;
  68
  69         irq = dwc3_host_get_irq(dwc);
  70         if (irq < 0)
  71                 return irq;
  72
  73         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  74         if (!xhci) {
  75                 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  76                 return -ENOMEM;
  77         }
  78
  79         xhci->dev.parent        = dwc->dev;
  80
  81         dwc->xhci = xhci;
  82
  83         ret = platform_device_add_resources(xhci, dwc->xhci_resources,
  84                                                 DWC3_XHCI_RESOURCES_NUM);
  85         if (ret) {
  86                 dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
  87                 goto err;
  88         }
  89
  90         memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
  91
  92         if (dwc->usb3_lpm_capable)
  93                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
  94
  95         if (dwc->usb2_lpm_disable)
  96                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
  97
  98         /**
  99          * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 100          * where Port Disable command doesn't work.
 101          *
 102          * The suggested workaround is that we avoid Port Disable
 103          * completely.
 104          *
 105          * This following flag tells XHCI to do just that.
 106          */
 107         if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
 108                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
 109
 110         if (prop_idx) {
 111                 ret = device_create_managed_software_node(&xhci->dev, props, NULL);
 112                 if (ret) {
 113                         dev_err(dwc->dev, "failed to add properties to xHCI\n");
 114                         goto err;
 115                 }
 116         }
 117
 118         ret = platform_device_add(xhci);
 119         if (ret) {
 120                 dev_err(dwc->dev, "failed to register xHCI device\n");
 121                 goto err;
 122         }
 123
 124         return 0;
 125 err:
 126         platform_device_put(xhci);
 127         return ret;
 128 }
 129
 130 void dwc3_host_exit(struct dwc3 *dwc)
 131 {
 132         platform_device_unregister(dwc->xhci);
 133         dwc->xhci = NULL;
 134 }