ohci-sm501.c 6.73 KB
Newer Older
Magnus Damm's avatar
Magnus Damm committed
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
/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2005 David Brownell
 * (C) Copyright 2002 Hewlett-Packard Company
 * (C) Copyright 2008 Magnus Damm
 *
 * SM501 Bus Glue - based on ohci-omap.c
 *
 * This file is licenced under the GPL.
 */

#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/sm501.h>
#include <linux/sm501-regs.h>

static int ohci_sm501_init(struct usb_hcd *hcd)
{
	return ohci_init(hcd_to_ohci(hcd));
}

static int ohci_sm501_start(struct usb_hcd *hcd)
{
	struct device *dev = hcd->self.controller;
	int ret;

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

	return ret;
}

/*-------------------------------------------------------------------------*/

static const struct hc_driver ohci_sm501_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"SM501 OHCI",
	.hcd_priv_size =	sizeof(struct ohci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq =			ohci_irq,
	.flags =		HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,

	/*
	 * basic lifecycle operations
	 */
	.reset =		ohci_sm501_init,
	.start =		ohci_sm501_start,
	.stop =			ohci_stop,
	.shutdown =		ohci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue =		ohci_urb_enqueue,
	.urb_dequeue =		ohci_urb_dequeue,
	.endpoint_disable =	ohci_endpoint_disable,

	/*
	 * scheduling support
	 */
	.get_frame_number =	ohci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data =	ohci_hub_status_data,
	.hub_control =		ohci_hub_control,
#ifdef	CONFIG_PM
	.bus_suspend =		ohci_bus_suspend,
	.bus_resume =		ohci_bus_resume,
#endif
	.start_port_reset =	ohci_start_port_reset,
};

/*-------------------------------------------------------------------------*/

static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
{
	const struct hc_driver *driver = &ohci_sm501_hc_driver;
	struct device *dev = &pdev->dev;
	struct resource	*res, *mem;
	int retval, irq;
93
	struct usb_hcd *hcd = NULL;
Magnus Damm's avatar
Magnus Damm committed
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

	irq = retval = platform_get_irq(pdev, 0);
	if (retval < 0)
		goto err0;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (mem == NULL) {
		dev_err(dev, "no resource definition for memory\n");
		retval = -ENOENT;
		goto err0;
	}

	if (!request_mem_region(mem->start, mem->end - mem->start + 1,
				pdev->name)) {
		dev_err(dev, "request_mem_region failed\n");
		retval = -EBUSY;
		goto err0;
	}

	/* The sm501 chip is equipped with local memory that may be used
	 * by on-chip devices such as the video controller and the usb host.
	 * This driver uses dma_declare_coherent_memory() to make sure
	 * usb allocations with dma_alloc_coherent() allocate from
	 * this local memory. The dma_handle returned by dma_alloc_coherent()
	 * will be an offset starting from 0 for the first local memory byte.
	 *
	 * So as long as data is allocated using dma_alloc_coherent() all is
	 * fine. This is however not always the case - buffers may be allocated
	 * using kmalloc() - so the usb core needs to be told that it must copy
	 * data into our local memory if the buffers happen to be placed in
	 * regular memory. The HCD_LOCAL_MEM flag does just that.
	 */

	if (!dma_declare_coherent_memory(dev, mem->start,
					 mem->start - mem->parent->start,
					 (mem->end - mem->start) + 1,
					 DMA_MEMORY_MAP |
					 DMA_MEMORY_EXCLUSIVE)) {
		dev_err(dev, "cannot declare coherent memory\n");
		retval = -ENXIO;
		goto err1;
	}

	/* allocate, reserve and remap resources for registers */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(dev, "no resource definition for registers\n");
		retval = -ENOENT;
		goto err2;
	}

	hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
	if (!hcd) {
		retval = -ENOMEM;
		goto err2;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = res->end - res->start + 1;

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,	pdev->name)) {
		dev_err(dev, "request_mem_region failed\n");
		retval = -EBUSY;
		goto err3;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (hcd->regs == NULL) {
		dev_err(dev, "cannot remap registers\n");
		retval = -ENXIO;
		goto err4;
	}

	ohci_hcd_init(hcd_to_ohci(hcd));

	retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
	if (retval)
		goto err4;

	/* enable power and unmask interrupts */

	sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
	sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);

	return 0;
err4:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err3:
	usb_put_hcd(hcd);
err2:
	dma_release_declared_memory(dev);
err1:
	release_mem_region(mem->start, mem->end - mem->start + 1);
err0:
	return retval;
}

static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct resource	*mem;

	usb_remove_hcd(hcd);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	dma_release_declared_memory(&pdev->dev);
	mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
201
202
	if (mem)
		release_mem_region(mem->start, mem->end - mem->start + 1);
Magnus Damm's avatar
Magnus Damm committed
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
229
230
231
232

	/* mask interrupts and disable power */

	sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
	sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);

	platform_set_drvdata(pdev, NULL);
	return 0;
}

/*-------------------------------------------------------------------------*/

#ifdef CONFIG_PM
static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
{
	struct device *dev = &pdev->dev;
	struct ohci_hcd	*ohci = hcd_to_ohci(platform_get_drvdata(pdev));

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

	sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
	ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
	return 0;
}

static int ohci_sm501_resume(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
233
234
	struct usb_hcd	*hcd = platform_get_drvdata(pdev);
	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
Magnus Damm's avatar
Magnus Damm committed
235
236
237
238
239
240

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

	sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
241
	ohci_finish_controller_resume(hcd);
Magnus Damm's avatar
Magnus Damm committed
242
243
	return 0;
}
244
245
246
#else
#define ohci_sm501_suspend NULL
#define ohci_sm501_resume NULL
Magnus Damm's avatar
Magnus Damm committed
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
#endif

/*-------------------------------------------------------------------------*/

/*
 * Driver definition to register with the SM501 bus
 */
static struct platform_driver ohci_hcd_sm501_driver = {
	.probe		= ohci_hcd_sm501_drv_probe,
	.remove		= ohci_hcd_sm501_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.suspend	= ohci_sm501_suspend,
	.resume		= ohci_sm501_resume,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "sm501-usb",
	},
};
265
MODULE_ALIAS("platform:sm501-usb");