tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6 * (C) Copyright 2002 Hewlett-Packard Company
7 *
8 * Bus Glue for ep93xx.
9 *
10 * Written by Christopher Hoover <ch@hpl.hp.com>
11 * Based on fragments of previous driver by Russell King et al.
12 *
13 * Modified for LH7A404 from ohci-sa1111.c
14 * by Durgesh Pattamatta <pattamattad@sharpsec.com>
15 *
16 * Modified for pxa27x from ohci-lh7a404.c
17 * by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
18 *
19 * Modified for ep93xx from ohci-pxa27x.c
20 * by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
21 * Based on an earlier driver by Ray Lehtiniemi
22 *
23 * This file is licenced under the GPL.
24 */
25
26#include <linux/clk.h>
27#include <linux/device.h>
28#include <linux/signal.h>
29#include <linux/platform_device.h>
30
31#include <asm/mach-types.h>
32#include <asm/hardware.h>
33
34static struct clk *usb_host_clock;
35
36static void ep93xx_start_hc(struct device *dev)
37{
38 clk_enable(usb_host_clock);
39}
40
41static void ep93xx_stop_hc(struct device *dev)
42{
43 clk_disable(usb_host_clock);
44}
45
46static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
47 struct platform_device *pdev)
48{
49 int retval;
50 struct usb_hcd *hcd;
51
52 if (pdev->resource[1].flags != IORESOURCE_IRQ) {
53 pr_debug("resource[1] is not IORESOURCE_IRQ");
54 return -ENOMEM;
55 }
56
57 hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
58 if (hcd == NULL)
59 return -ENOMEM;
60
61 hcd->rsrc_start = pdev->resource[0].start;
62 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
63 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
64 usb_put_hcd(hcd);
65 retval = -EBUSY;
66 goto err1;
67 }
68
69 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
70 if (hcd->regs == NULL) {
71 pr_debug("ioremap failed");
72 retval = -ENOMEM;
73 goto err2;
74 }
75
76 usb_host_clock = clk_get(&pdev->dev, "usb_host");
77 ep93xx_start_hc(&pdev->dev);
78
79 ohci_hcd_init(hcd_to_ohci(hcd));
80
81 retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
82 if (retval == 0)
83 return retval;
84
85 ep93xx_stop_hc(&pdev->dev);
86 iounmap(hcd->regs);
87err2:
88 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
89err1:
90 usb_put_hcd(hcd);
91
92 return retval;
93}
94
95static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
96 struct platform_device *pdev)
97{
98 usb_remove_hcd(hcd);
99 ep93xx_stop_hc(&pdev->dev);
100 clk_put(usb_host_clock);
101 iounmap(hcd->regs);
102 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
103 usb_put_hcd(hcd);
104}
105
106static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
107{
108 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
109 int ret;
110
111 if ((ret = ohci_init(ohci)) < 0)
112 return ret;
113
114 if ((ret = ohci_run(ohci)) < 0) {
115 err("can't start %s", hcd->self.bus_name);
116 ohci_stop(hcd);
117 return ret;
118 }
119
120 return 0;
121}
122
123static struct hc_driver ohci_ep93xx_hc_driver = {
124 .description = hcd_name,
125 .product_desc = "EP93xx OHCI",
126 .hcd_priv_size = sizeof(struct ohci_hcd),
127 .irq = ohci_irq,
128 .flags = HCD_USB11 | HCD_MEMORY,
129 .start = ohci_ep93xx_start,
130 .stop = ohci_stop,
131 .urb_enqueue = ohci_urb_enqueue,
132 .urb_dequeue = ohci_urb_dequeue,
133 .endpoint_disable = ohci_endpoint_disable,
134 .get_frame_number = ohci_get_frame,
135 .hub_status_data = ohci_hub_status_data,
136 .hub_control = ohci_hub_control,
137#ifdef CONFIG_PM
138 .bus_suspend = ohci_bus_suspend,
139 .bus_resume = ohci_bus_resume,
140#endif
141 .start_port_reset = ohci_start_port_reset,
142};
143
144extern int usb_disabled(void);
145
146static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
147{
148 int ret;
149
150 ret = -ENODEV;
151 if (!usb_disabled())
152 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
153
154 return ret;
155}
156
157static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
158{
159 struct usb_hcd *hcd = platform_get_drvdata(pdev);
160
161 usb_hcd_ep93xx_remove(hcd, pdev);
162
163 return 0;
164}
165
166#ifdef CONFIG_PM
167static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
168{
169 struct usb_hcd *hcd = platform_get_drvdata(pdev);
170 struct ochi_hcd *ohci = hcd_to_ohci(hcd);
171
172 if (time_before(jiffies, ohci->next_statechange))
173 msleep(5);
174 ohci->next_statechange = jiffies;
175
176 ep93xx_stop_hc(&pdev->dev);
177 hcd->state = HC_STATE_SUSPENDED;
178 pdev->dev.power.power_state = PMSG_SUSPEND;
179
180 return 0;
181}
182
183static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
184{
185 struct usb_hcd *hcd = platform_get_drvdata(pdev);
186 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
187 int status;
188
189 if (time_before(jiffies, ohci->next_statechange))
190 msleep(5);
191 ohci->next_statechange = jiffies;
192
193 ep93xx_start_hc(&pdev->dev);
194 pdev->dev.power.power_state = PMSG_ON;
195 usb_hcd_resume_root_hub(hcd);
196
197 return 0;
198}
199#endif
200
201
202static struct platform_driver ohci_hcd_ep93xx_driver = {
203 .probe = ohci_hcd_ep93xx_drv_probe,
204 .remove = ohci_hcd_ep93xx_drv_remove,
205#ifdef CONFIG_PM
206 .suspend = ohci_hcd_ep93xx_drv_suspend,
207 .resume = ohci_hcd_ep93xx_drv_resume,
208#endif
209 .driver = {
210 .name = "ep93xx-ohci",
211 },
212};
213
214static int __init ohci_hcd_ep93xx_init(void)
215{
216 return platform_driver_register(&ohci_hcd_ep93xx_driver);
217}
218
219static void __exit ohci_hcd_ep93xx_cleanup(void)
220{
221 platform_driver_unregister(&ohci_hcd_ep93xx_driver);
222}
223
224module_init(ohci_hcd_ep93xx_init);
225module_exit(ohci_hcd_ep93xx_cleanup);