summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ohci-tmio.c
blob: 5996a3b0a4d3418d514b84e718c7f6d9833aafdc (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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
/*
 * 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 Toshiba Mobile IO(TMIO) Controller's OHCI core
 * (C) Copyright 2005 Chris Humbert <mahadri-usb@drigon.com>
 * (C) Copyright 2007, 2008 Dmitry Baryshkov <dbaryshkov@gmail.com>
 *
 * This is known to work with the following variants:
 *	TC6393XB revision 3	(32kB SRAM)
 *
 * The TMIO's OHCI core DMAs through a small internal buffer that
 * is directly addressable by the CPU.
 *
 * Written from sparse documentation from Toshiba and Sharp's driver
 * for the 2.4 kernel,
 *	usb-ohci-tc6393.c(C) Copyright 2004 Lineo Solutions, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/namei.h>
#include <linux/sched.h>*/
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/dma-mapping.h>

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

/*
 * USB Host Controller Configuration Register
 */
#define CCR_REVID	0x08	/* b Revision ID				*/
#define CCR_BASE	0x10	/* l USB Control Register Base Address Low	*/
#define CCR_ILME	0x40	/* b Internal Local Memory Enable		*/
#define CCR_PM		0x4c	/* w Power Management			*/
#define CCR_INTC	0x50	/* b INT Control				*/
#define CCR_LMW1L	0x54	/* w Local Memory Window 1 LMADRS Low	*/
#define CCR_LMW1H	0x56	/* w Local Memory Window 1 LMADRS High	*/
#define CCR_LMW1BL	0x58	/* w Local Memory Window 1 Base Address Low	*/
#define CCR_LMW1BH	0x5A	/* w Local Memory Window 1 Base Address High	*/
#define CCR_LMW2L	0x5C	/* w Local Memory Window 2 LMADRS Low	*/
#define CCR_LMW2H	0x5E	/* w Local Memory Window 2 LMADRS High	*/
#define CCR_LMW2BL	0x60	/* w Local Memory Window 2 Base Address Low	*/
#define CCR_LMW2BH	0x62	/* w Local Memory Window 2 Base Address High	*/
#define CCR_MISC	0xFC	/* b MISC					*/

#define CCR_PM_GKEN      0x0001
#define CCR_PM_CKRNEN    0x0002
#define CCR_PM_USBPW1    0x0004
#define CCR_PM_USBPW2    0x0008
#define CCR_PM_USBPW3    0x0008
#define CCR_PM_PMEE      0x0100
#define CCR_PM_PMES      0x8000

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

struct tmio_hcd {
	void __iomem		*ccr;
	spinlock_t		lock; /* protects RMW cycles */
};

#define hcd_to_tmio(hcd)	((struct tmio_hcd *)(hcd_to_ohci(hcd) + 1))

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

static void tmio_write_pm(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
	u16 pm;
	unsigned long flags;

	spin_lock_irqsave(&tmio->lock, flags);

	pm = CCR_PM_GKEN | CCR_PM_CKRNEN |
	     CCR_PM_PMEE | CCR_PM_PMES;

	tmio_iowrite16(pm, tmio->ccr + CCR_PM);
	spin_unlock_irqrestore(&tmio->lock, flags);
}

static void tmio_stop_hc(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
	u16 pm;

	pm = CCR_PM_GKEN | CCR_PM_CKRNEN;
	switch (ohci->num_ports) {
		default:
			dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
		case 3:
			pm |= CCR_PM_USBPW3;
		case 2:
			pm |= CCR_PM_USBPW2;
		case 1:
			pm |= CCR_PM_USBPW1;
	}
	tmio_iowrite8(0, tmio->ccr + CCR_INTC);
	tmio_iowrite8(0, tmio->ccr + CCR_ILME);
	tmio_iowrite16(0, tmio->ccr + CCR_BASE);
	tmio_iowrite16(0, tmio->ccr + CCR_BASE + 2);
	tmio_iowrite16(pm, tmio->ccr + CCR_PM);
}

static void tmio_start_hc(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
	unsigned long base = hcd->rsrc_start;

	tmio_write_pm(dev);
	tmio_iowrite16(base, tmio->ccr + CCR_BASE);
	tmio_iowrite16(base >> 16, tmio->ccr + CCR_BASE + 2);
	tmio_iowrite8(1, tmio->ccr + CCR_ILME);
	tmio_iowrite8(2, tmio->ccr + CCR_INTC);

	dev_info(&dev->dev, "revision %d @ 0x%08llx, irq %d\n",
			tmio_ioread8(tmio->ccr + CCR_REVID), hcd->rsrc_start, hcd->irq);
}

static int ohci_tmio_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) {
		dev_err(hcd->self.controller, "can't start %s\n",
			hcd->self.bus_name);
		ohci_stop(hcd);
		return ret;
	}

	return 0;
}

static const struct hc_driver ohci_tmio_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"TMIO OHCI USB Host Controller",
	.hcd_priv_size =	sizeof(struct ohci_hcd) + sizeof (struct tmio_hcd),

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

	/* basic lifecycle operations */
	.start =		ohci_tmio_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 struct platform_driver ohci_hcd_tmio_driver;

static int ohci_hcd_tmio_drv_probe(struct platform_device *dev)
{
	const struct mfd_cell *cell = mfd_get_cell(dev);
	struct resource *regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
	struct resource *config = platform_get_resource(dev, IORESOURCE_MEM, 1);
	struct resource *sram = platform_get_resource(dev, IORESOURCE_MEM, 2);
	int irq = platform_get_irq(dev, 0);
	struct tmio_hcd *tmio;
	struct ohci_hcd *ohci;
	struct usb_hcd *hcd;
	int ret;

	if (usb_disabled())
		return -ENODEV;

	if (!cell)
		return -EINVAL;

	hcd = usb_create_hcd(&ohci_tmio_hc_driver, &dev->dev, dev_name(&dev->dev));
	if (!hcd) {
		ret = -ENOMEM;
		goto err_usb_create_hcd;
	}

	hcd->rsrc_start = regs->start;
	hcd->rsrc_len = resource_size(regs);

	tmio = hcd_to_tmio(hcd);

	spin_lock_init(&tmio->lock);

	tmio->ccr = ioremap(config->start, resource_size(config));
	if (!tmio->ccr) {
		ret = -ENOMEM;
		goto err_ioremap_ccr;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		ret = -ENOMEM;
		goto err_ioremap_regs;
	}

	if (!dma_declare_coherent_memory(&dev->dev, sram->start,
				sram->start,
				resource_size(sram),
				DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE)) {
		ret = -EBUSY;
		goto err_dma_declare;
	}

	if (cell->enable) {
		ret = cell->enable(dev);
		if (ret)
			goto err_enable;
	}

	tmio_start_hc(dev);
	ohci = hcd_to_ohci(hcd);
	ohci_hcd_init(ohci);

	ret = usb_add_hcd(hcd, irq, 0);
	if (ret)
		goto err_add_hcd;

	if (ret == 0)
		return ret;

	usb_remove_hcd(hcd);

err_add_hcd:
	tmio_stop_hc(dev);
	if (cell->disable)
		cell->disable(dev);
err_enable:
	dma_release_declared_memory(&dev->dev);
err_dma_declare:
	iounmap(hcd->regs);
err_ioremap_regs:
	iounmap(tmio->ccr);
err_ioremap_ccr:
	usb_put_hcd(hcd);
err_usb_create_hcd:

	return ret;
}

static int __devexit ohci_hcd_tmio_drv_remove(struct platform_device *dev)
{
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
	const struct mfd_cell *cell = mfd_get_cell(dev);

	usb_remove_hcd(hcd);
	tmio_stop_hc(dev);
	if (cell->disable)
		cell->disable(dev);
	dma_release_declared_memory(&dev->dev);
	iounmap(hcd->regs);
	iounmap(tmio->ccr);
	usb_put_hcd(hcd);

	platform_set_drvdata(dev, NULL);

	return 0;
}

#ifdef CONFIG_PM
static int ohci_hcd_tmio_drv_suspend(struct platform_device *dev, pm_message_t state)
{
	const struct mfd_cell *cell = mfd_get_cell(dev);
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
	unsigned long flags;
	u8 misc;
	int ret;

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

	spin_lock_irqsave(&tmio->lock, flags);

	misc = tmio_ioread8(tmio->ccr + CCR_MISC);
	misc |= 1 << 3; /* USSUSP */
	tmio_iowrite8(misc, tmio->ccr + CCR_MISC);

	spin_unlock_irqrestore(&tmio->lock, flags);

	if (cell->suspend) {
		ret = cell->suspend(dev);
		if (ret)
			return ret;
	}
	return 0;
}

static int ohci_hcd_tmio_drv_resume(struct platform_device *dev)
{
	const struct mfd_cell *cell = mfd_get_cell(dev);
	struct usb_hcd *hcd = platform_get_drvdata(dev);
	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
	unsigned long flags;
	u8 misc;
	int ret;

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

	if (cell->resume) {
		ret = cell->resume(dev);
		if (ret)
			return ret;
	}

	tmio_start_hc(dev);

	spin_lock_irqsave(&tmio->lock, flags);

	misc = tmio_ioread8(tmio->ccr + CCR_MISC);
	misc &= ~(1 << 3); /* USSUSP */
	tmio_iowrite8(misc, tmio->ccr + CCR_MISC);

	spin_unlock_irqrestore(&tmio->lock, flags);

	ohci_resume(hcd, false);

	return 0;
}
#else
#define ohci_hcd_tmio_drv_suspend NULL
#define ohci_hcd_tmio_drv_resume NULL
#endif

static struct platform_driver ohci_hcd_tmio_driver = {
	.probe		= ohci_hcd_tmio_drv_probe,
	.remove		= ohci_hcd_tmio_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.suspend	= ohci_hcd_tmio_drv_suspend,
	.resume		= ohci_hcd_tmio_drv_resume,
	.driver		= {
		.name	= "tmio-ohci",
		.owner	= THIS_MODULE,
	},
};
OpenPOWER on IntegriCloud