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
31static struct clk *usb_host_clock;
32
33static void ep93xx_start_hc(struct device *dev)
34{
35 clk_enable(usb_host_clock);
36}
37
38static void ep93xx_stop_hc(struct device *dev)
39{
40 clk_disable(usb_host_clock);
41}
42
43static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
44 struct platform_device *pdev)
45{
46 int retval;
47 struct usb_hcd *hcd;
48
49 if (pdev->resource[1].flags != IORESOURCE_IRQ) {
50 dev_dbg(&pdev->dev, "resource[1] is not IORESOURCE_IRQ\n");
51 return -ENOMEM;
52 }
53
54 hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
55 if (hcd == NULL)
56 return -ENOMEM;
57
58 hcd->rsrc_start = pdev->resource[0].start;
59 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
60 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
61 usb_put_hcd(hcd);
62 retval = -EBUSY;
63 goto err1;
64 }
65
66 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
67 if (hcd->regs == NULL) {
68 dev_dbg(&pdev->dev, "ioremap failed\n");
69 retval = -ENOMEM;
70 goto err2;
71 }
72
73 usb_host_clock = clk_get(&pdev->dev, NULL);
74 if (IS_ERR(usb_host_clock)) {
75 dev_dbg(&pdev->dev, "clk_get failed\n");
76 retval = PTR_ERR(usb_host_clock);
77 goto err3;
78 }
79
80 ep93xx_start_hc(&pdev->dev);
81
82 ohci_hcd_init(hcd_to_ohci(hcd));
83
84 retval = usb_add_hcd(hcd, pdev->resource[1].start, 0);
85 if (retval == 0)
86 return retval;
87
88 ep93xx_stop_hc(&pdev->dev);
89err3:
90 iounmap(hcd->regs);
91err2:
92 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
93err1:
94 usb_put_hcd(hcd);
95
96 return retval;
97}
98
99static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
100 struct platform_device *pdev)
101{
102 usb_remove_hcd(hcd);
103 ep93xx_stop_hc(&pdev->dev);
104 clk_put(usb_host_clock);
105 iounmap(hcd->regs);
106 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
107 usb_put_hcd(hcd);
108}
109
110static int ohci_ep93xx_start(struct usb_hcd *hcd)
111{
112 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
113 int ret;
114
115 if ((ret = ohci_init(ohci)) < 0)
116 return ret;
117
118 if ((ret = ohci_run(ohci)) < 0) {
119 dev_err(hcd->self.controller, "can't start %s\n",
120 hcd->self.bus_name);
121 ohci_stop(hcd);
122 return ret;
123 }
124
125 return 0;
126}
127
128static struct hc_driver ohci_ep93xx_hc_driver = {
129 .description = hcd_name,
130 .product_desc = "EP93xx OHCI",
131 .hcd_priv_size = sizeof(struct ohci_hcd),
132 .irq = ohci_irq,
133 .flags = HCD_USB11 | HCD_MEMORY,
134 .start = ohci_ep93xx_start,
135 .stop = ohci_stop,
136 .shutdown = ohci_shutdown,
137 .urb_enqueue = ohci_urb_enqueue,
138 .urb_dequeue = ohci_urb_dequeue,
139 .endpoint_disable = ohci_endpoint_disable,
140 .get_frame_number = ohci_get_frame,
141 .hub_status_data = ohci_hub_status_data,
142 .hub_control = ohci_hub_control,
143#ifdef CONFIG_PM
144 .bus_suspend = ohci_bus_suspend,
145 .bus_resume = ohci_bus_resume,
146#endif
147 .start_port_reset = ohci_start_port_reset,
148};
149
150extern int usb_disabled(void);
151
152static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
153{
154 int ret;
155
156 ret = -ENODEV;
157 if (!usb_disabled())
158 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
159
160 return ret;
161}
162
163static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
164{
165 struct usb_hcd *hcd = platform_get_drvdata(pdev);
166
167 usb_hcd_ep93xx_remove(hcd, pdev);
168
169 return 0;
170}
171
172#ifdef CONFIG_PM
173static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
174{
175 struct usb_hcd *hcd = platform_get_drvdata(pdev);
176 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
177
178 if (time_before(jiffies, ohci->next_statechange))
179 msleep(5);
180 ohci->next_statechange = jiffies;
181
182 ep93xx_stop_hc(&pdev->dev);
183 return 0;
184}
185
186static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
187{
188 struct usb_hcd *hcd = platform_get_drvdata(pdev);
189 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
190
191 if (time_before(jiffies, ohci->next_statechange))
192 msleep(5);
193 ohci->next_statechange = jiffies;
194
195 ep93xx_start_hc(&pdev->dev);
196
197 ohci_resume(hcd, false);
198 return 0;
199}
200#endif
201
202
203static struct platform_driver ohci_hcd_ep93xx_driver = {
204 .probe = ohci_hcd_ep93xx_drv_probe,
205 .remove = ohci_hcd_ep93xx_drv_remove,
206 .shutdown = usb_hcd_platform_shutdown,
207#ifdef CONFIG_PM
208 .suspend = ohci_hcd_ep93xx_drv_suspend,
209 .resume = ohci_hcd_ep93xx_drv_resume,
210#endif
211 .driver = {
212 .name = "ep93xx-ohci",
213 .owner = THIS_MODULE,
214 },
215};
216
217MODULE_ALIAS("platform:ep93xx-ohci");