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 | |
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(dev: &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(np: pdev->dev.of_node); |
27 | else |
28 | dwc->xhci_resources[1].name = name; |
29 | } |
30 | |
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(dev: dwc3_pdev, name: "host" ); |
37 | if (irq > 0) { |
38 | dwc3_host_fill_xhci_irq_res(dwc, irq, name: "host" ); |
39 | goto out; |
40 | } |
41 | |
42 | if (irq == -EPROBE_DEFER) |
43 | goto out; |
44 | |
45 | irq = platform_get_irq_byname_optional(dev: dwc3_pdev, name: "dwc_usb3" ); |
46 | if (irq > 0) { |
47 | dwc3_host_fill_xhci_irq_res(dwc, irq, name: "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 | |
58 | out: |
59 | return irq; |
60 | } |
61 | |
62 | int dwc3_host_init(struct dwc3 *dwc) |
63 | { |
64 | struct property_entry props[4]; |
65 | struct platform_device *xhci; |
66 | int ret, irq; |
67 | int prop_idx = 0; |
68 | |
69 | irq = dwc3_host_get_irq(dwc); |
70 | if (irq < 0) |
71 | return irq; |
72 | |
73 | xhci = platform_device_alloc(name: "xhci-hcd" , PLATFORM_DEVID_AUTO); |
74 | if (!xhci) { |
75 | dev_err(dwc->dev, "couldn't allocate xHCI device\n" ); |
76 | return -ENOMEM; |
77 | } |
78 | |
79 | xhci->dev.parent = dwc->dev; |
80 | |
81 | dwc->xhci = xhci; |
82 | |
83 | ret = platform_device_add_resources(pdev: xhci, res: dwc->xhci_resources, |
84 | DWC3_XHCI_RESOURCES_NUM); |
85 | if (ret) { |
86 | dev_err(dwc->dev, "couldn't add resources to xHCI device\n" ); |
87 | goto err; |
88 | } |
89 | |
90 | memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props)); |
91 | |
92 | if (dwc->usb3_lpm_capable) |
93 | props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable" ); |
94 | |
95 | if (dwc->usb2_lpm_disable) |
96 | props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable" ); |
97 | |
98 | /** |
99 | * WORKAROUND: dwc3 revisions <=3.00a have a limitation |
100 | * where Port Disable command doesn't work. |
101 | * |
102 | * The suggested workaround is that we avoid Port Disable |
103 | * completely. |
104 | * |
105 | * This following flag tells XHCI to do just that. |
106 | */ |
107 | if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A)) |
108 | props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped" ); |
109 | |
110 | if (prop_idx) { |
111 | ret = device_create_managed_software_node(dev: &xhci->dev, properties: props, NULL); |
112 | if (ret) { |
113 | dev_err(dwc->dev, "failed to add properties to xHCI\n" ); |
114 | goto err; |
115 | } |
116 | } |
117 | |
118 | ret = platform_device_add(pdev: xhci); |
119 | if (ret) { |
120 | dev_err(dwc->dev, "failed to register xHCI device\n" ); |
121 | goto err; |
122 | } |
123 | |
124 | return 0; |
125 | err: |
126 | platform_device_put(pdev: xhci); |
127 | return ret; |
128 | } |
129 | |
130 | void dwc3_host_exit(struct dwc3 *dwc) |
131 | { |
132 | platform_device_unregister(dwc->xhci); |
133 | dwc->xhci = NULL; |
134 | } |
135 | |