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 const struct software_node dwc3_haps_swnode = {
 37	.properties = initial_properties,
 38};
 39
 40static int dwc3_haps_probe(struct pci_dev *pci,
 41			   const struct pci_device_id *id)
 42{
 43	struct dwc3_haps	*dwc;
 44	struct device		*dev = &pci->dev;
 45	struct resource		res[2];
 46	int			ret;
 47
 48	ret = pcim_enable_device(pci);
 49	if (ret) {
 50		dev_err(dev, "failed to enable pci device\n");
 51		return -ENODEV;
 52	}
 53
 54	pci_set_master(pci);
 55
 56	dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
 57	if (!dwc)
 58		return -ENOMEM;
 59
 60	dwc->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
 61	if (!dwc->dwc3)
 62		return -ENOMEM;
 63
 64	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
 65
 66	res[0].start	= pci_resource_start(pci, 0);
 67	res[0].end	= pci_resource_end(pci, 0);
 68	res[0].name	= "dwc_usb3";
 69	res[0].flags	= IORESOURCE_MEM;
 70
 71	res[1].start	= pci->irq;
 72	res[1].name	= "dwc_usb3";
 73	res[1].flags	= IORESOURCE_IRQ;
 74
 75	ret = platform_device_add_resources(dwc->dwc3, res, ARRAY_SIZE(res));
 76	if (ret) {
 77		dev_err(dev, "couldn't add resources to dwc3 device\n");
 78		goto err;
 79	}
 80
 81	dwc->pci = pci;
 82	dwc->dwc3->dev.parent = dev;
 83
 84	ret = device_add_software_node(&dwc->dwc3->dev, &dwc3_haps_swnode);
 85	if (ret)
 86		goto err;
 87
 88	ret = platform_device_add(dwc->dwc3);
 89	if (ret) {
 90		dev_err(dev, "failed to register dwc3 device\n");
 91		goto err;
 92	}
 93
 94	pci_set_drvdata(pci, dwc);
 95
 96	return 0;
 97err:
 98	device_remove_software_node(&dwc->dwc3->dev);
 99	platform_device_put(dwc->dwc3);
100	return ret;
101}
102
103static void dwc3_haps_remove(struct pci_dev *pci)
104{
105	struct dwc3_haps *dwc = pci_get_drvdata(pci);
106
107	device_remove_software_node(&dwc->dwc3->dev);
108	platform_device_unregister(dwc->dwc3);
109}
110
111static const struct pci_device_id dwc3_haps_id_table[] = {
112	{
113		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
114			   PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
115		/*
116		 * i.MX6QP and i.MX7D platform use a PCIe controller with the
117		 * same VID and PID as this USB controller. The system may
118		 * incorrectly match this driver to that PCIe controller. To
119		 * workaround this, specifically use class type USB to prevent
120		 * incorrect driver matching.
121		 */
122		.class = (PCI_CLASS_SERIAL_USB << 8),
123		.class_mask = 0xffff00,
124	},
125	{
126		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
127			   PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
128	},
129	{
130		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
131			   PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
132	},
133	{  }	/* Terminating Entry */
134};
135MODULE_DEVICE_TABLE(pci, dwc3_haps_id_table);
136
137static struct pci_driver dwc3_haps_driver = {
138	.name		= "dwc3-haps",
139	.id_table	= dwc3_haps_id_table,
140	.probe		= dwc3_haps_probe,
141	.remove		= dwc3_haps_remove,
142};
143
144MODULE_AUTHOR("Thinh Nguyen <thinhn@synopsys.com>");
145MODULE_LICENSE("GPL v2");
146MODULE_DESCRIPTION("Synopsys HAPS PCI Glue Layer");
147
148module_pci_driver(dwc3_haps_driver);