xref: /openbmc/linux/drivers/usb/dwc3/dwc3-haps.c (revision d87c25e8)
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  */
23 struct dwc3_haps {
24 	struct platform_device *dwc3;
25 	struct pci_dev *pci;
26 };
27 
28 static 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 
36 static const struct software_node dwc3_haps_swnode = {
37 	.properties = initial_properties,
38 };
39 
40 static 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;
97 err:
98 	device_remove_software_node(&dwc->dwc3->dev);
99 	platform_device_put(dwc->dwc3);
100 	return ret;
101 }
102 
103 static 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 
111 static 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 };
135 MODULE_DEVICE_TABLE(pci, dwc3_haps_id_table);
136 
137 static 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 
144 MODULE_AUTHOR("Thinh Nguyen <thinhn@synopsys.com>");
145 MODULE_LICENSE("GPL v2");
146 MODULE_DESCRIPTION("Synopsys HAPS PCI Glue Layer");
147 
148 module_pci_driver(dwc3_haps_driver);
149