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
dwc3_haps_probe(struct pci_dev * pci,const struct pci_device_id * id)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
dwc3_haps_remove(struct pci_dev * pci)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