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);
143