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
 14static 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_optional(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_optional(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)
 38		irq = -EINVAL;
 39
 40out:
 41	return irq;
 42}
 43
 44int dwc3_host_init(struct dwc3 *dwc)
 45{
 46	struct property_entry	props[4];
 47	struct platform_device	*xhci;
 48	int			ret, irq;
 49	struct resource		*res;
 50	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
 51	int			prop_idx = 0;
 52
 53	irq = dwc3_host_get_irq(dwc);
 54	if (irq < 0)
 55		return irq;
 56
 57	res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
 58	if (!res)
 59		res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
 60				"dwc_usb3");
 61	if (!res)
 62		res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
 63	if (!res)
 64		return -ENOMEM;
 65
 66	dwc->xhci_resources[1].start = irq;
 67	dwc->xhci_resources[1].end = irq;
 68	dwc->xhci_resources[1].flags = res->flags;
 69	dwc->xhci_resources[1].name = res->name;
 70
 71	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
 72	if (!xhci) {
 73		dev_err(dwc->dev, "couldn't allocate xHCI device\n");
 74		return -ENOMEM;
 75	}
 76
 77	xhci->dev.parent	= dwc->dev;
 78
 79	dwc->xhci = xhci;
 80
 81	ret = platform_device_add_resources(xhci, dwc->xhci_resources,
 82						DWC3_XHCI_RESOURCES_NUM);
 83	if (ret) {
 84		dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
 85		goto err;
 86	}
 87
 88	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
 89
 90	if (dwc->usb3_lpm_capable)
 91		props[prop_idx++].name = "usb3-lpm-capable";
 92
 93	if (dwc->usb2_lpm_disable)
 94		props[prop_idx++].name = "usb2-lpm-disable";
 95
 96	/**
 97	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 98	 * where Port Disable command doesn't work.
 99	 *
100	 * The suggested workaround is that we avoid Port Disable
101	 * completely.
102	 *
103	 * This following flag tells XHCI to do just that.
104	 */
105	if (dwc->revision <= DWC3_REVISION_300A)
106		props[prop_idx++].name = "quirk-broken-port-ped";
107
108	if (prop_idx) {
109		ret = platform_device_add_properties(xhci, props);
110		if (ret) {
111			dev_err(dwc->dev, "failed to add properties to xHCI\n");
112			goto err;
113		}
114	}
115
116	ret = platform_device_add(xhci);
117	if (ret) {
118		dev_err(dwc->dev, "failed to register xHCI device\n");
119		goto err;
120	}
121
122	return 0;
123err:
124	platform_device_put(xhci);
125	return ret;
126}
127
128void dwc3_host_exit(struct dwc3 *dwc)
129{
130	platform_device_unregister(dwc->xhci);
131}