aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/host/ohci-ep93xx.c
blob: 3348b07f0fe507209a261575d43d1d15073b7d55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
 * (C) Copyright 2002 Hewlett-Packard Company
 *
 * Bus Glue for ep93xx.
 *
 * Written by Christopher Hoover <ch@hpl.hp.com>
 * Based on fragments of previous driver by Russell King et al.
 *
 * Modified for LH7A404 from ohci-sa1111.c
 *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
 *
 * Modified for pxa27x from ohci-lh7a404.c
 *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
 *
 * Modified for ep93xx from ohci-pxa27x.c
 *  by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
 *  Based on an earlier driver by Ray Lehtiniemi
 *
 * This file is licenced under the GPL.
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/signal.h>
#include <linux/platform_device.h>

#include <asm/mach-types.h>
#include <asm/hardware.h>

static struct clk *usb_host_clock;

static void ep93xx_start_hc(struct device *dev)
{
	clk_enable(usb_host_clock);
}

static void ep93xx_stop_hc(struct device *dev)
{
	clk_disable(usb_host_clock);
}

static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
			 struct platform_device *pdev)
{
	int retval;
	struct usb_hcd *hcd;

	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
		pr_debug("resource[1] is not IORESOURCE_IRQ");
		return -ENOMEM;
	}

	hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
	if (hcd == NULL)
		return -ENOMEM;

	hcd->rsrc_start = pdev->resource[0].start;
	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		usb_put_hcd(hcd);
		retval = -EBUSY;
		goto err1;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (hcd->regs == NULL) {
		pr_debug("ioremap failed");
		retval = -ENOMEM;
		goto err2;
	}

	usb_host_clock = clk_get(&pdev->dev, "usb_host");
	ep93xx_start_hc(&pdev->dev);

	ohci_hcd_init(hcd_to_ohci(hcd));

	retval = usb_add_hcd(hcd, pdev->resource[1].start, SA_INTERRUPT);
	if (retval == 0)
		return retval;

	ep93xx_stop_hc(&pdev->dev);
	iounmap(hcd->regs);
err2:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
	usb_put_hcd(hcd);

	return retval;
}

static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
			struct platform_device *pdev)
{
	usb_remove_hcd(hcd);
	ep93xx_stop_hc(&pdev->dev);
	clk_put(usb_host_clock);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
}

static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
{
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	int ret;

	if ((ret = ohci_init(ohci)) < 0)
		return ret;

	if ((ret = ohci_run(ohci)) < 0) {
		err("can't start %s", hcd->self.bus_name);
		ohci_stop(hcd);
		return ret;
	}

	return 0;
}

static struct hc_driver ohci_ep93xx_hc_driver = {
	.description		= hcd_name,
	.product_desc		= "EP93xx OHCI",
	.hcd_priv_size		= sizeof(struct ohci_hcd),
	.irq			= ohci_irq,
	.flags			= HCD_USB11 | HCD_MEMORY,
	.start			= ohci_ep93xx_start,
	.stop			= ohci_stop,
	.shutdown		= ohci_shutdown,
	.urb_enqueue		= ohci_urb_enqueue,
	.urb_dequeue		= ohci_urb_dequeue,
	.endpoint_disable	= ohci_endpoint_disable,
	.get_frame_number	= ohci_get_frame,
	.hub_status_data	= ohci_hub_status_data,
	.hub_control		= ohci_hub_control,
	.hub_irq_enable		= ohci_rhsc_enable,
#ifdef CONFIG_PM
	.bus_suspend		= ohci_bus_suspend,
	.bus_resume		= ohci_bus_resume,
#endif
	.start_port_reset	= ohci_start_port_reset,
};

extern int usb_disabled(void);

static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
{
	int ret;

	ret = -ENODEV;
	if (!usb_disabled())
		ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);

	return ret;
}

static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_hcd_ep93xx_remove(hcd, pdev);

	return 0;
}

#ifdef CONFIG_PM
static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);

	if (time_before(jiffies, ohci->next_statechange))
		msleep(5);
	ohci->next_statechange = jiffies;

	ep93xx_stop_hc(&pdev->dev);
	hcd->state = HC_STATE_SUSPENDED;
	pdev->dev.power.power_state = PMSG_SUSPEND;

	return 0;
}

static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	int status;

	if (time_before(jiffies, ohci->next_statechange))
		msleep(5);
	ohci->next_statechange = jiffies;

	ep93xx_start_hc(&pdev->dev);
	pdev->dev.power.power_state = PMSG_ON;
	usb_hcd_resume_root_hub(hcd);

	return 0;
}
#endif


static struct platform_driver ohci_hcd_ep93xx_driver = {
	.probe		= ohci_hcd_ep93xx_drv_probe,
	.remove		= ohci_hcd_ep93xx_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
	.suspend	= ohci_hcd_ep93xx_drv_suspend,
	.resume		= ohci_hcd_ep93xx_drv_resume,
#endif
	.driver		= {
		.name	= "ep93xx-ohci",
	},
};

static int __init ohci_hcd_ep93xx_init(void)
{
	return platform_driver_register(&ohci_hcd_ep93xx_driver);
}

static void __exit ohci_hcd_ep93xx_cleanup(void)
{
	platform_driver_unregister(&ohci_hcd_ep93xx_driver);
}

module_init(ohci_hcd_ep93xx_init);
module_exit(ohci_hcd_ep93xx_cleanup);