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
 13#include "core.h"
 14
 15static int dwc3_host_get_irq(struct dwc3 *dwc)
 16{
 17	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
 18	int irq;
 19
 20	irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
 21	if (irq > 0)
 22		goto out;
 23
 24	if (irq == -EPROBE_DEFER)
 25		goto out;
 26
 27	irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
 28	if (irq > 0)
 29		goto out;
 30
 31	if (irq == -EPROBE_DEFER)
 32		goto out;
 33
 34	irq = platform_get_irq(dwc3_pdev, 0);
 35	if (irq > 0)
 36		goto out;
 37
 38	if (!irq)
 39		irq = -EINVAL;
 40
 41out:
 42	return irq;
 43}
 44
 45int dwc3_host_init(struct dwc3 *dwc)
 46{
 47	struct property_entry	props[4];
 48	struct platform_device	*xhci;
 49	int			ret, irq;
 50	struct resource		*res;
 51	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
 52	int			prop_idx = 0;
 53
 54	irq = dwc3_host_get_irq(dwc);
 55	if (irq < 0)
 56		return irq;
 57
 58	res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
 59	if (!res)
 60		res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
 61				"dwc_usb3");
 62	if (!res)
 63		res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
 64	if (!res)
 65		return -ENOMEM;
 66
 67	dwc->xhci_resources[1].start = irq;
 68	dwc->xhci_resources[1].end = irq;
 69	dwc->xhci_resources[1].flags = res->flags;
 70	dwc->xhci_resources[1].name = res->name;
 71
 72	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
 73	if (!xhci) {
 74		dev_err(dwc->dev, "couldn't allocate xHCI device\n");
 75		return -ENOMEM;
 76	}
 77
 78	xhci->dev.parent	= dwc->dev;
 79	ACPI_COMPANION_SET(&xhci->dev, ACPI_COMPANION(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;
125err:
126	platform_device_put(xhci);
127	return ret;
128}
129
130void dwc3_host_exit(struct dwc3 *dwc)
131{
132	platform_device_unregister(dwc->xhci);
133}