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3429e91a SAS |
1 | /* |
2 | * xhci-plat.c - xHCI host controller driver platform Bus Glue. | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com | |
5 | * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> | |
6 | * | |
7 | * A lot of code borrowed from the Linux xHCI driver. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/platform_device.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/slab.h> | |
17 | ||
18 | #include "xhci.h" | |
19 | ||
20 | static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci) | |
21 | { | |
22 | /* | |
23 | * As of now platform drivers don't provide MSI support so we ensure | |
24 | * here that the generic code does not try to make a pci_dev from our | |
25 | * dev struct in order to setup MSI | |
26 | */ | |
27 | xhci->quirks |= XHCI_BROKEN_MSI; | |
28 | } | |
29 | ||
30 | /* called during probe() after chip reset completes */ | |
31 | static int xhci_plat_setup(struct usb_hcd *hcd) | |
32 | { | |
33 | return xhci_gen_setup(hcd, xhci_plat_quirks); | |
34 | } | |
35 | ||
36 | static const struct hc_driver xhci_plat_xhci_driver = { | |
37 | .description = "xhci-hcd", | |
38 | .product_desc = "xHCI Host Controller", | |
39 | .hcd_priv_size = sizeof(struct xhci_hcd *), | |
40 | ||
41 | /* | |
42 | * generic hardware linkage | |
43 | */ | |
44 | .irq = xhci_irq, | |
45 | .flags = HCD_MEMORY | HCD_USB3 | HCD_SHARED, | |
46 | ||
47 | /* | |
48 | * basic lifecycle operations | |
49 | */ | |
50 | .reset = xhci_plat_setup, | |
51 | .start = xhci_run, | |
52 | .stop = xhci_stop, | |
53 | .shutdown = xhci_shutdown, | |
54 | ||
55 | /* | |
56 | * managing i/o requests and associated device resources | |
57 | */ | |
58 | .urb_enqueue = xhci_urb_enqueue, | |
59 | .urb_dequeue = xhci_urb_dequeue, | |
60 | .alloc_dev = xhci_alloc_dev, | |
61 | .free_dev = xhci_free_dev, | |
62 | .alloc_streams = xhci_alloc_streams, | |
63 | .free_streams = xhci_free_streams, | |
64 | .add_endpoint = xhci_add_endpoint, | |
65 | .drop_endpoint = xhci_drop_endpoint, | |
66 | .endpoint_reset = xhci_endpoint_reset, | |
67 | .check_bandwidth = xhci_check_bandwidth, | |
68 | .reset_bandwidth = xhci_reset_bandwidth, | |
69 | .address_device = xhci_address_device, | |
70 | .update_hub_device = xhci_update_hub_device, | |
71 | .reset_device = xhci_discover_or_reset_device, | |
72 | ||
73 | /* | |
74 | * scheduling support | |
75 | */ | |
76 | .get_frame_number = xhci_get_frame, | |
77 | ||
78 | /* Root hub support */ | |
79 | .hub_control = xhci_hub_control, | |
80 | .hub_status_data = xhci_hub_status_data, | |
81 | .bus_suspend = xhci_bus_suspend, | |
82 | .bus_resume = xhci_bus_resume, | |
83 | }; | |
84 | ||
85 | static int xhci_plat_probe(struct platform_device *pdev) | |
86 | { | |
87 | const struct hc_driver *driver; | |
88 | struct xhci_hcd *xhci; | |
89 | struct resource *res; | |
90 | struct usb_hcd *hcd; | |
91 | int ret; | |
92 | int irq; | |
93 | ||
94 | if (usb_disabled()) | |
95 | return -ENODEV; | |
96 | ||
97 | driver = &xhci_plat_xhci_driver; | |
98 | ||
99 | irq = platform_get_irq(pdev, 0); | |
100 | if (irq < 0) | |
101 | return -ENODEV; | |
102 | ||
103 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
104 | if (!res) | |
105 | return -ENODEV; | |
106 | ||
107 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); | |
108 | if (!hcd) | |
109 | return -ENOMEM; | |
110 | ||
111 | hcd->rsrc_start = res->start; | |
112 | hcd->rsrc_len = resource_size(res); | |
113 | ||
114 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, | |
115 | driver->description)) { | |
116 | dev_dbg(&pdev->dev, "controller already in use\n"); | |
117 | ret = -EBUSY; | |
118 | goto put_hcd; | |
119 | } | |
120 | ||
319acdfc | 121 | hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len); |
3429e91a SAS |
122 | if (!hcd->regs) { |
123 | dev_dbg(&pdev->dev, "error mapping memory\n"); | |
124 | ret = -EFAULT; | |
125 | goto release_mem_region; | |
126 | } | |
127 | ||
128 | ret = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
129 | if (ret) | |
130 | goto unmap_registers; | |
131 | ||
132 | /* USB 2.0 roothub is stored in the platform_device now. */ | |
133 | hcd = dev_get_drvdata(&pdev->dev); | |
134 | xhci = hcd_to_xhci(hcd); | |
135 | xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev, | |
136 | dev_name(&pdev->dev), hcd); | |
137 | if (!xhci->shared_hcd) { | |
138 | ret = -ENOMEM; | |
139 | goto dealloc_usb2_hcd; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset) | |
144 | * is called by usb_add_hcd(). | |
145 | */ | |
146 | *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci; | |
147 | ||
148 | ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); | |
149 | if (ret) | |
150 | goto put_usb3_hcd; | |
151 | ||
152 | return 0; | |
153 | ||
154 | put_usb3_hcd: | |
155 | usb_put_hcd(xhci->shared_hcd); | |
156 | ||
157 | dealloc_usb2_hcd: | |
158 | usb_remove_hcd(hcd); | |
159 | ||
160 | unmap_registers: | |
161 | iounmap(hcd->regs); | |
162 | ||
163 | release_mem_region: | |
164 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
165 | ||
166 | put_hcd: | |
167 | usb_put_hcd(hcd); | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
172 | static int xhci_plat_remove(struct platform_device *dev) | |
173 | { | |
174 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
175 | struct xhci_hcd *xhci = hcd_to_xhci(hcd); | |
176 | ||
177 | usb_remove_hcd(xhci->shared_hcd); | |
178 | usb_put_hcd(xhci->shared_hcd); | |
179 | ||
180 | usb_remove_hcd(hcd); | |
181 | iounmap(hcd->regs); | |
182 | usb_put_hcd(hcd); | |
183 | kfree(xhci); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static struct platform_driver usb_xhci_driver = { | |
189 | .probe = xhci_plat_probe, | |
190 | .remove = xhci_plat_remove, | |
191 | .driver = { | |
192 | .name = "xhci-hcd", | |
193 | }, | |
194 | }; | |
195 | MODULE_ALIAS("platform:xhci-hcd"); | |
196 | ||
197 | int xhci_register_plat(void) | |
198 | { | |
199 | return platform_driver_register(&usb_xhci_driver); | |
200 | } | |
201 | ||
202 | void xhci_unregister_plat(void) | |
203 | { | |
204 | platform_driver_unregister(&usb_xhci_driver); | |
205 | } |