tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * drivers/usb/host/ehci-vt8500.c
3 *
4 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
5 *
6 * Based on ehci-au1xxx.c
7 *
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 */
18
19#include <linux/platform_device.h>
20
21static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
22{
23 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
24 int rc = 0;
25
26 if (!udev->parent) /* udev is root hub itself, impossible */
27 rc = -1;
28 /* we only support lpm device connected to root hub yet */
29 if (ehci->has_lpm && !udev->parent->parent) {
30 rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
31 if (!rc)
32 rc = ehci_lpm_check(ehci, udev->portnum);
33 }
34 return rc;
35}
36
37static const struct hc_driver vt8500_ehci_hc_driver = {
38 .description = hcd_name,
39 .product_desc = "VT8500 EHCI",
40 .hcd_priv_size = sizeof(struct ehci_hcd),
41
42 /*
43 * generic hardware linkage
44 */
45 .irq = ehci_irq,
46 .flags = HCD_MEMORY | HCD_USB2,
47
48 /*
49 * basic lifecycle operations
50 */
51 .reset = ehci_init,
52 .start = ehci_run,
53 .stop = ehci_stop,
54 .shutdown = ehci_shutdown,
55
56 /*
57 * managing i/o requests and associated device resources
58 */
59 .urb_enqueue = ehci_urb_enqueue,
60 .urb_dequeue = ehci_urb_dequeue,
61 .endpoint_disable = ehci_endpoint_disable,
62 .endpoint_reset = ehci_endpoint_reset,
63
64 /*
65 * scheduling support
66 */
67 .get_frame_number = ehci_get_frame,
68
69 /*
70 * root hub support
71 */
72 .hub_status_data = ehci_hub_status_data,
73 .hub_control = ehci_hub_control,
74 .bus_suspend = ehci_bus_suspend,
75 .bus_resume = ehci_bus_resume,
76 .relinquish_port = ehci_relinquish_port,
77 .port_handed_over = ehci_port_handed_over,
78
79 /*
80 * call back when device connected and addressed
81 */
82 .update_device = ehci_update_device,
83
84 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
85};
86
87static int vt8500_ehci_drv_probe(struct platform_device *pdev)
88{
89 struct usb_hcd *hcd;
90 struct ehci_hcd *ehci;
91 struct resource *res;
92 int ret;
93
94 if (usb_disabled())
95 return -ENODEV;
96
97 if (pdev->resource[1].flags != IORESOURCE_IRQ) {
98 pr_debug("resource[1] is not IORESOURCE_IRQ");
99 return -ENOMEM;
100 }
101 hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
102 if (!hcd)
103 return -ENOMEM;
104
105 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106 hcd->rsrc_start = res->start;
107 hcd->rsrc_len = resource_size(res);
108
109 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
110 pr_debug("request_mem_region failed");
111 ret = -EBUSY;
112 goto err1;
113 }
114
115 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
116 if (!hcd->regs) {
117 pr_debug("ioremap failed");
118 ret = -ENOMEM;
119 goto err2;
120 }
121
122 ehci = hcd_to_ehci(hcd);
123 ehci->caps = hcd->regs;
124 ehci->regs = hcd->regs +
125 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
126
127 dbg_hcs_params(ehci, "reset");
128 dbg_hcc_params(ehci, "reset");
129
130 /* cache this readonly data; minimize chip reads */
131 ehci->hcs_params = readl(&ehci->caps->hcs_params);
132
133 ehci_port_power(ehci, 1);
134
135 ret = usb_add_hcd(hcd, pdev->resource[1].start,
136 IRQF_SHARED);
137 if (ret == 0) {
138 platform_set_drvdata(pdev, hcd);
139 return ret;
140 }
141
142 iounmap(hcd->regs);
143err2:
144 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
145err1:
146 usb_put_hcd(hcd);
147 return ret;
148}
149
150static int vt8500_ehci_drv_remove(struct platform_device *pdev)
151{
152 struct usb_hcd *hcd = platform_get_drvdata(pdev);
153
154 usb_remove_hcd(hcd);
155 iounmap(hcd->regs);
156 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
157 usb_put_hcd(hcd);
158 platform_set_drvdata(pdev, NULL);
159
160 return 0;
161}
162
163static struct platform_driver vt8500_ehci_driver = {
164 .probe = vt8500_ehci_drv_probe,
165 .remove = vt8500_ehci_drv_remove,
166 .shutdown = usb_hcd_platform_shutdown,
167 .driver = {
168 .name = "vt8500-ehci",
169 .owner = THIS_MODULE,
170 }
171};
172
173MODULE_ALIAS("platform:vt8500-ehci");