1// SPDX-License-Identifier: GPL-2.0
  2/**
  3 * dwc3-haps.c - Synopsys HAPS PCI Specific glue layer
  4 *
  5 * Copyright (C) 2018 Synopsys, Inc.
  6 *
  7 * Authors: Thinh Nguyen <thinhn@synopsys.com>,
  8 *          John Youn <johnyoun@synopsys.com>
  9 */
 10
 11#include <linux/kernel.h>
 12#include <linux/module.h>
 13#include <linux/slab.h>
 14#include <linux/pci.h>
 15#include <linux/platform_device.h>
 16#include <linux/property.h>
 17
 18/**
 19 * struct dwc3_haps - Driver private structure
 20 * @dwc3: child dwc3 platform_device
 21 * @pci: our link to PCI bus
 22 */
 23struct dwc3_haps {
 24	struct platform_device *dwc3;
 25	struct pci_dev *pci;
 26};
 27
 28static const struct property_entry initial_properties[] = {
 29	PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
 30	PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
 31	PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
 32	PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
 33	{ },
 34};
 35
 36static int dwc3_haps_probe(struct pci_dev *pci,
 37			   const struct pci_device_id *id)
 38{
 39	struct dwc3_haps	*dwc;
 40	struct device		*dev = &pci->dev;
 41	struct resource		res[2];
 42	int			ret;
 43
 44	ret = pcim_enable_device(pci);
 45	if (ret) {
 46		dev_err(dev, "failed to enable pci device\n");
 47		return -ENODEV;
 48	}
 49
 50	pci_set_master(pci);
 51
 52	dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
 53	if (!dwc)
 54		return -ENOMEM;
 55
 56	dwc->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
 57	if (!dwc->dwc3)
 58		return -ENOMEM;
 59
 60	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
 61
 62	res[0].start	= pci_resource_start(pci, 0);
 63	res[0].end	= pci_resource_end(pci, 0);
 64	res[0].name	= "dwc_usb3";
 65	res[0].flags	= IORESOURCE_MEM;
 66
 67	res[1].start	= pci->irq;
 68	res[1].name	= "dwc_usb3";
 69	res[1].flags	= IORESOURCE_IRQ;
 70
 71	ret = platform_device_add_resources(dwc->dwc3, res, ARRAY_SIZE(res));
 72	if (ret) {
 73		dev_err(dev, "couldn't add resources to dwc3 device\n");
 74		goto err;
 75	}
 76
 77	dwc->pci = pci;
 78	dwc->dwc3->dev.parent = dev;
 79
 80	ret = platform_device_add_properties(dwc->dwc3, initial_properties);
 81	if (ret)
 82		goto err;
 83
 84	ret = platform_device_add(dwc->dwc3);
 85	if (ret) {
 86		dev_err(dev, "failed to register dwc3 device\n");
 87		goto err;
 88	}
 89
 90	pci_set_drvdata(pci, dwc);
 91
 92	return 0;
 93err:
 94	platform_device_put(dwc->dwc3);
 95	return ret;
 96}
 97
 98static void dwc3_haps_remove(struct pci_dev *pci)
 99{
100	struct dwc3_haps *dwc = pci_get_drvdata(pci);
101
102	platform_device_unregister(dwc->dwc3);
103}
104
105static const struct pci_device_id dwc3_haps_id_table[] = {
106	{
107		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
108			   PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
109		/*
110		 * i.MX6QP and i.MX7D platform use a PCIe controller with the
111		 * same VID and PID as this USB controller. The system may
112		 * incorrectly match this driver to that PCIe controller. To
113		 * workaround this, specifically use class type USB to prevent
114		 * incorrect driver matching.
115		 */
116		.class = (PCI_CLASS_SERIAL_USB << 8),
117		.class_mask = 0xffff00,
118	},
119	{
120		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
121			   PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
122	},
123	{
124		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
125			   PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
126	},
127	{  }	/* Terminating Entry */
128};
129MODULE_DEVICE_TABLE(pci, dwc3_haps_id_table);
130
131static struct pci_driver dwc3_haps_driver = {
132	.name		= "dwc3-haps",
133	.id_table	= dwc3_haps_id_table,
134	.probe		= dwc3_haps_probe,
135	.remove		= dwc3_haps_remove,
136};
137
138MODULE_AUTHOR("Thinh Nguyen <thinhn@synopsys.com>");
139MODULE_LICENSE("GPL v2");
140MODULE_DESCRIPTION("Synopsys HAPS PCI Glue Layer");
141
142module_pci_driver(dwc3_haps_driver);