1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * host.c - DesignWare USB3 DRD Controller Host Glue
4 *
5 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
6 *
7 * Authors: Felipe Balbi <balbi@ti.com>,
8 */
9
10 #include <linux/irq.h>
11 #include <linux/of.h>
12 #include <linux/platform_device.h>
13
14 #include "core.h"
15
dwc3_host_fill_xhci_irq_res(struct dwc3 * dwc,int irq,char * name)16 static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
17 int irq, char *name)
18 {
19 struct platform_device *pdev = to_platform_device(dwc->dev);
20 struct device_node *np = dev_of_node(&pdev->dev);
21
22 dwc->xhci_resources[1].start = irq;
23 dwc->xhci_resources[1].end = irq;
24 dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
25 if (!name && np)
26 dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node);
27 else
28 dwc->xhci_resources[1].name = name;
29 }
30
dwc3_host_get_irq(struct dwc3 * dwc)31 static int dwc3_host_get_irq(struct dwc3 *dwc)
32 {
33 struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
34 int irq;
35
36 irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
37 if (irq > 0) {
38 dwc3_host_fill_xhci_irq_res(dwc, irq, "host");
39 goto out;
40 }
41
42 if (irq == -EPROBE_DEFER)
43 goto out;
44
45 irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
46 if (irq > 0) {
47 dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3");
48 goto out;
49 }
50
51 if (irq == -EPROBE_DEFER)
52 goto out;
53
54 irq = platform_get_irq(dwc3_pdev, 0);
55 if (irq > 0) {
56 dwc3_host_fill_xhci_irq_res(dwc, irq, NULL);
57 goto out;
58 }
59
60 if (!irq)
61 irq = -EINVAL;
62
63 out:
64 return irq;
65 }
66
dwc3_host_init(struct dwc3 * dwc)67 int dwc3_host_init(struct dwc3 *dwc)
68 {
69 struct property_entry props[4];
70 struct platform_device *xhci;
71 int ret, irq;
72 int prop_idx = 0;
73
74 irq = dwc3_host_get_irq(dwc);
75 if (irq < 0)
76 return irq;
77
78 xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
79 if (!xhci) {
80 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
81 return -ENOMEM;
82 }
83
84 xhci->dev.parent = dwc->dev;
85
86 dwc->xhci = xhci;
87
88 ret = platform_device_add_resources(xhci, dwc->xhci_resources,
89 DWC3_XHCI_RESOURCES_NUM);
90 if (ret) {
91 dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
92 goto err;
93 }
94
95 memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
96
97 if (dwc->usb3_lpm_capable)
98 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
99
100 if (dwc->usb2_lpm_disable)
101 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
102
103 /**
104 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
105 * where Port Disable command doesn't work.
106 *
107 * The suggested workaround is that we avoid Port Disable
108 * completely.
109 *
110 * This following flag tells XHCI to do just that.
111 */
112 if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
113 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
114
115 if (prop_idx) {
116 ret = device_create_managed_software_node(&xhci->dev, props, NULL);
117 if (ret) {
118 dev_err(dwc->dev, "failed to add properties to xHCI\n");
119 goto err;
120 }
121 }
122
123 ret = platform_device_add(xhci);
124 if (ret) {
125 dev_err(dwc->dev, "failed to register xHCI device\n");
126 goto err;
127 }
128
129 return 0;
130 err:
131 platform_device_put(xhci);
132 return ret;
133 }
134
dwc3_host_exit(struct dwc3 * dwc)135 void dwc3_host_exit(struct dwc3 *dwc)
136 {
137 platform_device_unregister(dwc->xhci);
138 dwc->xhci = NULL;
139 }
140
