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/irq.h>
 11#include <linux/of.h>
 12#include <linux/platform_device.h>
 13
 14#include "core.h"
 15
 16static 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
 31static 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
 58out:
 59	return irq;
 60}
 61
 62int dwc3_host_init(struct dwc3 *dwc)
 63{
 64	struct property_entry	props[5];
 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	props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk");
 93
 94	if (dwc->usb3_lpm_capable)
 95		props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
 96
 97	if (dwc->usb2_lpm_disable)
 98		props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
 99
100	/**
101	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
102	 * where Port Disable command doesn't work.
103	 *
104	 * The suggested workaround is that we avoid Port Disable
105	 * completely.
106	 *
107	 * This following flag tells XHCI to do just that.
108	 */
109	if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
110		props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
111
112	if (prop_idx) {
113		ret = device_create_managed_software_node(&xhci->dev, props, NULL);
114		if (ret) {
115			dev_err(dwc->dev, "failed to add properties to xHCI\n");
116			goto err;
117		}
118	}
119
120	ret = platform_device_add(xhci);
121	if (ret) {
122		dev_err(dwc->dev, "failed to register xHCI device\n");
123		goto err;
124	}
125
126	return 0;
127err:
128	platform_device_put(xhci);
129	return ret;
130}
131
132void dwc3_host_exit(struct dwc3 *dwc)
133{
134	platform_device_unregister(dwc->xhci);
135	dwc->xhci = NULL;
136}