summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/tc6393xb.c
blob: 83dc703f37679e878eb8982b64fa108b1d5fa8bf (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
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
/*
 * Toshiba TC6393XB SoC support
 *
 * Copyright(c) 2005-2006 Chris Humbert
 * Copyright(c) 2005 Dirk Opfer
 * Copyright(c) 2005 Ian Molton <spyro@f2s.com>
 * Copyright(c) 2007 Dmitry Baryshkov
 *
 * Based on code written by Sharp/Lineo for 2.4 kernels
 * Based on locomo.c
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mfd/tc6393xb.h>
#include <linux/gpio.h>

#define SCR_REVID	0x08		/* b Revision ID	*/
#define SCR_ISR		0x50		/* b Interrupt Status	*/
#define SCR_IMR		0x52		/* b Interrupt Mask	*/
#define SCR_IRR		0x54		/* b Interrupt Routing	*/
#define SCR_GPER	0x60		/* w GP Enable		*/
#define SCR_GPI_SR(i)	(0x64 + (i))	/* b3 GPI Status	*/
#define SCR_GPI_IMR(i)	(0x68 + (i))	/* b3 GPI INT Mask	*/
#define SCR_GPI_EDER(i)	(0x6c + (i))	/* b3 GPI Edge Detect Enable */
#define SCR_GPI_LIR(i)	(0x70 + (i))	/* b3 GPI Level Invert	*/
#define SCR_GPO_DSR(i)	(0x78 + (i))	/* b3 GPO Data Set	*/
#define SCR_GPO_DOECR(i) (0x7c + (i))	/* b3 GPO Data OE Control */
#define SCR_GP_IARCR(i)	(0x80 + (i))	/* b3 GP Internal Active Register Control */
#define SCR_GP_IARLCR(i) (0x84 + (i))	/* b3 GP INTERNAL Active Register Level Control */
#define SCR_GPI_BCR(i)	(0x88 + (i))	/* b3 GPI Buffer Control */
#define SCR_GPA_IARCR	0x8c		/* w GPa Internal Active Register Control */
#define SCR_GPA_IARLCR	0x90		/* w GPa Internal Active Register Level Control */
#define SCR_GPA_BCR	0x94		/* w GPa Buffer Control */
#define SCR_CCR		0x98		/* w Clock Control	*/
#define SCR_PLL2CR	0x9a		/* w PLL2 Control	*/
#define SCR_PLL1CR	0x9c		/* l PLL1 Control	*/
#define SCR_DIARCR	0xa0		/* b Device Internal Active Register Control */
#define SCR_DBOCR	0xa1		/* b Device Buffer Off Control */
#define SCR_FER		0xe0		/* b Function Enable	*/
#define SCR_MCR		0xe4		/* w Mode Control	*/
#define SCR_CONFIG	0xfc		/* b Configuration Control */
#define SCR_DEBUG	0xff		/* b Debug		*/

#define SCR_CCR_CK32K	BIT(0)
#define SCR_CCR_USBCK	BIT(1)
#define SCR_CCR_UNK1	BIT(4)
#define SCR_CCR_MCLK_MASK	(7 << 8)
#define SCR_CCR_MCLK_OFF	(0 << 8)
#define SCR_CCR_MCLK_12	(1 << 8)
#define SCR_CCR_MCLK_24	(2 << 8)
#define SCR_CCR_MCLK_48	(3 << 8)
#define SCR_CCR_HCLK_MASK	(3 << 12)
#define SCR_CCR_HCLK_24	(0 << 12)
#define SCR_CCR_HCLK_48	(1 << 12)

#define SCR_FER_USBEN		BIT(0)	/* USB host enable */
#define SCR_FER_LCDCVEN		BIT(1)	/* polysilicon TFT enable */
#define SCR_FER_SLCDEN		BIT(2)	/* SLCD enable */

#define SCR_MCR_RDY_MASK		(3 << 0)
#define SCR_MCR_RDY_OPENDRAIN	(0 << 0)
#define SCR_MCR_RDY_TRISTATE	(1 << 0)
#define SCR_MCR_RDY_PUSHPULL	(2 << 0)
#define SCR_MCR_RDY_UNK		BIT(2)
#define SCR_MCR_RDY_EN		BIT(3)
#define SCR_MCR_INT_MASK		(3 << 4)
#define SCR_MCR_INT_OPENDRAIN	(0 << 4)
#define SCR_MCR_INT_TRISTATE	(1 << 4)
#define SCR_MCR_INT_PUSHPULL	(2 << 4)
#define SCR_MCR_INT_UNK		BIT(6)
#define SCR_MCR_INT_EN		BIT(7)
/* bits 8 - 16 are unknown */

#define TC_GPIO_BIT(i)		(1 << (i & 0x7))

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

struct tc6393xb {
	void __iomem		*scr;

	struct gpio_chip	gpio;

	struct clk		*clk; /* 3,6 Mhz */

	spinlock_t		lock; /* protects RMW cycles */

	struct {
		u8		fer;
		u16		ccr;
		u8		gpi_bcr[3];
		u8		gpo_dsr[3];
		u8		gpo_doecr[3];
	} suspend_state;

	struct resource		rscr;
	struct resource		*iomem;
	int			irq;
	int			irq_base;
};

enum {
	TC6393XB_CELL_NAND,
	TC6393XB_CELL_MMC,
};

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

static int tc6393xb_nand_enable(struct platform_device *nand)
{
	struct platform_device *dev = to_platform_device(nand->dev.parent);
	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&tc6393xb->lock, flags);

	/* SMD buffer on */
	dev_dbg(&dev->dev, "SMD buffer on\n");
	tmio_iowrite8(0xff, tc6393xb->scr + SCR_GPI_BCR(1));

	spin_unlock_irqrestore(&tc6393xb->lock, flags);

	return 0;
}

static struct resource __devinitdata tc6393xb_nand_resources[] = {
	{
		.start	= 0x1000,
		.end	= 0x1007,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= 0x0100,
		.end	= 0x01ff,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= IRQ_TC6393_NAND,
		.end	= IRQ_TC6393_NAND,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct resource __devinitdata tc6393xb_mmc_resources[] = {
	{
		.start	= 0x800,
		.end	= 0x9ff,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= 0x200,
		.end	= 0x2ff,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= IRQ_TC6393_MMC,
		.end	= IRQ_TC6393_MMC,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct mfd_cell __devinitdata tc6393xb_cells[] = {
	[TC6393XB_CELL_NAND] = {
		.name = "tmio-nand",
		.enable = tc6393xb_nand_enable,
		.num_resources = ARRAY_SIZE(tc6393xb_nand_resources),
		.resources = tc6393xb_nand_resources,
	},
	[TC6393XB_CELL_MMC] = {
		.name = "tmio-mmc",
		.num_resources = ARRAY_SIZE(tc6393xb_mmc_resources),
		.resources = tc6393xb_mmc_resources,
	},
};

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

static int tc6393xb_gpio_get(struct gpio_chip *chip,
		unsigned offset)
{
	struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);

	/* XXX: does dsr also represent inputs? */
	return tmio_ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8))
		& TC_GPIO_BIT(offset);
}

static void __tc6393xb_gpio_set(struct gpio_chip *chip,
		unsigned offset, int value)
{
	struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
	u8  dsr;

	dsr = tmio_ioread8(tc6393xb->scr + SCR_GPO_DSR(offset / 8));
	if (value)
		dsr |= TC_GPIO_BIT(offset);
	else
		dsr &= ~TC_GPIO_BIT(offset);

	tmio_iowrite8(dsr, tc6393xb->scr + SCR_GPO_DSR(offset / 8));
}

static void tc6393xb_gpio_set(struct gpio_chip *chip,
		unsigned offset, int value)
{
	struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
	unsigned long flags;

	spin_lock_irqsave(&tc6393xb->lock, flags);

	__tc6393xb_gpio_set(chip, offset, value);

	spin_unlock_irqrestore(&tc6393xb->lock, flags);
}

static int tc6393xb_gpio_direction_input(struct gpio_chip *chip,
			unsigned offset)
{
	struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
	unsigned long flags;
	u8 doecr;

	spin_lock_irqsave(&tc6393xb->lock, flags);

	doecr = tmio_ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
	doecr &= ~TC_GPIO_BIT(offset);
	tmio_iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8));

	spin_unlock_irqrestore(&tc6393xb->lock, flags);

	return 0;
}

static int tc6393xb_gpio_direction_output(struct gpio_chip *chip,
			unsigned offset, int value)
{
	struct tc6393xb *tc6393xb = container_of(chip, struct tc6393xb, gpio);
	unsigned long flags;
	u8 doecr;

	spin_lock_irqsave(&tc6393xb->lock, flags);

	__tc6393xb_gpio_set(chip, offset, value);

	doecr = tmio_ioread8(tc6393xb->scr + SCR_GPO_DOECR(offset / 8));
	doecr |= TC_GPIO_BIT(offset);
	tmio_iowrite8(doecr, tc6393xb->scr + SCR_GPO_DOECR(offset / 8));

	spin_unlock_irqrestore(&tc6393xb->lock, flags);

	return 0;
}

static int tc6393xb_register_gpio(struct tc6393xb *tc6393xb, int gpio_base)
{
	tc6393xb->gpio.label = "tc6393xb";
	tc6393xb->gpio.base = gpio_base;
	tc6393xb->gpio.ngpio = 16;
	tc6393xb->gpio.set = tc6393xb_gpio_set;
	tc6393xb->gpio.get = tc6393xb_gpio_get;
	tc6393xb->gpio.direction_input = tc6393xb_gpio_direction_input;
	tc6393xb->gpio.direction_output = tc6393xb_gpio_direction_output;

	return gpiochip_add(&tc6393xb->gpio);
}

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

static void
tc6393xb_irq(unsigned int irq, struct irq_desc *desc)
{
	struct tc6393xb *tc6393xb = get_irq_data(irq);
	unsigned int isr;
	unsigned int i, irq_base;

	irq_base = tc6393xb->irq_base;

	while ((isr = tmio_ioread8(tc6393xb->scr + SCR_ISR) &
				~tmio_ioread8(tc6393xb->scr + SCR_IMR)))
		for (i = 0; i < TC6393XB_NR_IRQS; i++) {
			if (isr & (1 << i))
				generic_handle_irq(irq_base + i);
		}
}

static void tc6393xb_irq_ack(unsigned int irq)
{
}

static void tc6393xb_irq_mask(unsigned int irq)
{
	struct tc6393xb *tc6393xb = get_irq_chip_data(irq);
	unsigned long flags;
	u8 imr;

	spin_lock_irqsave(&tc6393xb->lock, flags);
	imr = tmio_ioread8(tc6393xb->scr + SCR_IMR);
	imr |= 1 << (irq - tc6393xb->irq_base);
	tmio_iowrite8(imr, tc6393xb->scr + SCR_IMR);
	spin_unlock_irqrestore(&tc6393xb->lock, flags);
}

static void tc6393xb_irq_unmask(unsigned int irq)
{
	struct tc6393xb *tc6393xb = get_irq_chip_data(irq);
	unsigned long flags;
	u8 imr;

	spin_lock_irqsave(&tc6393xb->lock, flags);
	imr = tmio_ioread8(tc6393xb->scr + SCR_IMR);
	imr &= ~(1 << (irq - tc6393xb->irq_base));
	tmio_iowrite8(imr, tc6393xb->scr + SCR_IMR);
	spin_unlock_irqrestore(&tc6393xb->lock, flags);
}

static struct irq_chip tc6393xb_chip = {
	.name	= "tc6393xb",
	.ack	= tc6393xb_irq_ack,
	.mask	= tc6393xb_irq_mask,
	.unmask	= tc6393xb_irq_unmask,
};

static void tc6393xb_attach_irq(struct platform_device *dev)
{
	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
	unsigned int irq, irq_base;

	irq_base = tc6393xb->irq_base;

	for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) {
		set_irq_chip(irq, &tc6393xb_chip);
		set_irq_chip_data(irq, tc6393xb);
		set_irq_handler(irq, handle_edge_irq);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}

	set_irq_type(tc6393xb->irq, IRQ_TYPE_EDGE_FALLING);
	set_irq_data(tc6393xb->irq, tc6393xb);
	set_irq_chained_handler(tc6393xb->irq, tc6393xb_irq);
}

static void tc6393xb_detach_irq(struct platform_device *dev)
{
	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
	unsigned int irq, irq_base;

	set_irq_chained_handler(tc6393xb->irq, NULL);
	set_irq_data(tc6393xb->irq, NULL);

	irq_base = tc6393xb->irq_base;

	for (irq = irq_base; irq < irq_base + TC6393XB_NR_IRQS; irq++) {
		set_irq_flags(irq, 0);
		set_irq_chip(irq, NULL);
		set_irq_chip_data(irq, NULL);
	}
}

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

static int tc6393xb_hw_init(struct platform_device *dev)
{
	struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
	int i;

	iowrite8(tc6393xb->suspend_state.fer,	tc6393xb->scr + SCR_FER);
	iowrite16(tcpd->scr_pll2cr,		tc6393xb->scr + SCR_PLL2CR);
	iowrite16(tc6393xb->suspend_state.ccr,	tc6393xb->scr + SCR_CCR);
	iowrite16(SCR_MCR_RDY_OPENDRAIN | SCR_MCR_RDY_UNK | SCR_MCR_RDY_EN |
		  SCR_MCR_INT_OPENDRAIN | SCR_MCR_INT_UNK | SCR_MCR_INT_EN |
		  BIT(15),			tc6393xb->scr + SCR_MCR);
	iowrite16(tcpd->scr_gper,		tc6393xb->scr + SCR_GPER);
	iowrite8(0,				tc6393xb->scr + SCR_IRR);
	iowrite8(0xbf,				tc6393xb->scr + SCR_IMR);

	for (i = 0; i < 3; i++) {
		iowrite8(tc6393xb->suspend_state.gpo_dsr[i],
					tc6393xb->scr + SCR_GPO_DSR(i));
		iowrite8(tc6393xb->suspend_state.gpo_doecr[i],
					tc6393xb->scr + SCR_GPO_DOECR(i));
		iowrite8(tc6393xb->suspend_state.gpi_bcr[i],
					tc6393xb->scr + SCR_GPI_BCR(i));
	}

	return 0;
}

static int __devinit tc6393xb_probe(struct platform_device *dev)
{
	struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
	struct tc6393xb *tc6393xb;
	struct resource *iomem, *rscr;
	int ret, temp;
	int i;

	iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
	if (!iomem)
		return -EINVAL;

	tc6393xb = kzalloc(sizeof *tc6393xb, GFP_KERNEL);
	if (!tc6393xb) {
		ret = -ENOMEM;
		goto err_kzalloc;
	}

	spin_lock_init(&tc6393xb->lock);

	platform_set_drvdata(dev, tc6393xb);

	ret = platform_get_irq(dev, 0);
	if (ret >= 0)
		tc6393xb->irq = ret;
	else
		goto err_noirq;

	tc6393xb->iomem = iomem;
	tc6393xb->irq_base = tcpd->irq_base;

	tc6393xb->clk = clk_get(&dev->dev, "CLK_CK3P6MI");
	if (IS_ERR(tc6393xb->clk)) {
		ret = PTR_ERR(tc6393xb->clk);
		goto err_clk_get;
	}

	rscr = &tc6393xb->rscr;
	rscr->name = "tc6393xb-core";
	rscr->start = iomem->start;
	rscr->end = iomem->start + 0xff;
	rscr->flags = IORESOURCE_MEM;

	ret = request_resource(iomem, rscr);
	if (ret)
		goto err_request_scr;

	tc6393xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
	if (!tc6393xb->scr) {
		ret = -ENOMEM;
		goto err_ioremap;
	}

	ret = clk_enable(tc6393xb->clk);
	if (ret)
		goto err_clk_enable;

	ret = tcpd->enable(dev);
	if (ret)
		goto err_enable;

	tc6393xb->suspend_state.fer = 0;

	tc6393xb->suspend_state.ccr = SCR_CCR_UNK1 |
					SCR_CCR_HCLK_48;

	ret = tc6393xb_hw_init(dev);
	if (ret)
		goto err_hw_init;

	printk(KERN_INFO "Toshiba tc6393xb revision %d at 0x%08lx, irq %d\n",
			tmio_ioread8(tc6393xb->scr + SCR_REVID),
			(unsigned long) iomem->start, tc6393xb->irq);

	tc6393xb->gpio.base = -1;

	if (tcpd->gpio_base >= 0) {
		ret = tc6393xb_register_gpio(tc6393xb, tcpd->gpio_base);
		if (ret)
			goto err_gpio_add;
	}

	tc6393xb_attach_irq(dev);

	if (tcpd->setup) {
		ret = tcpd->setup(dev);
		if (ret)
			goto err_setup;
	}

	tc6393xb_cells[TC6393XB_CELL_NAND].driver_data = tcpd->nand_data;
	tc6393xb_cells[TC6393XB_CELL_NAND].platform_data =
		&tc6393xb_cells[TC6393XB_CELL_NAND];
	tc6393xb_cells[TC6393XB_CELL_NAND].data_size =
		sizeof(tc6393xb_cells[TC6393XB_CELL_NAND]);
	tc6393xb_cells[TC6393XB_CELL_MMC].platform_data =
		&tc6393xb_cells[TC6393XB_CELL_MMC];
	tc6393xb_cells[TC6393XB_CELL_MMC].data_size =
		sizeof(tc6393xb_cells[TC6393XB_CELL_MMC]);


	ret = mfd_add_devices(&dev->dev, dev->id,
			tc6393xb_cells, ARRAY_SIZE(tc6393xb_cells),
			iomem, tcpd->irq_base);

	if (!ret)
		return 0;

	if (tcpd->teardown)
		tcpd->teardown(dev);

err_setup:
	tc6393xb_detach_irq(dev);

err_gpio_add:
	if (tc6393xb->gpio.base != -1)
		temp = gpiochip_remove(&tc6393xb->gpio);
err_hw_init:
	tcpd->disable(dev);
err_clk_enable:
	clk_disable(tc6393xb->clk);
err_enable:
	iounmap(tc6393xb->scr);
err_ioremap:
	release_resource(&tc6393xb->rscr);
err_request_scr:
	clk_put(tc6393xb->clk);
err_noirq:
err_clk_get:
	kfree(tc6393xb);
err_kzalloc:
	return ret;
}

static int __devexit tc6393xb_remove(struct platform_device *dev)
{
	struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
	int ret;

	mfd_remove_devices(&dev->dev);

	if (tcpd->teardown)
		tcpd->teardown(dev);

	tc6393xb_detach_irq(dev);

	if (tc6393xb->gpio.base != -1) {
		ret = gpiochip_remove(&tc6393xb->gpio);
		if (ret) {
			dev_err(&dev->dev, "Can't remove gpio chip: %d\n", ret);
			return ret;
		}
	}

	ret = tcpd->disable(dev);
	clk_disable(tc6393xb->clk);
	iounmap(tc6393xb->scr);
	release_resource(&tc6393xb->rscr);
	platform_set_drvdata(dev, NULL);
	clk_put(tc6393xb->clk);
	kfree(tc6393xb);

	return ret;
}

#ifdef CONFIG_PM
static int tc6393xb_suspend(struct platform_device *dev, pm_message_t state)
{
	struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
	int i, ret;

	tc6393xb->suspend_state.ccr = ioread16(tc6393xb->scr + SCR_CCR);
	tc6393xb->suspend_state.fer = ioread8(tc6393xb->scr + SCR_FER);

	for (i = 0; i < 3; i++) {
		tc6393xb->suspend_state.gpo_dsr[i] =
			ioread8(tc6393xb->scr + SCR_GPO_DSR(i));
		tc6393xb->suspend_state.gpo_doecr[i] =
			ioread8(tc6393xb->scr + SCR_GPO_DOECR(i));
		tc6393xb->suspend_state.gpi_bcr[i] =
			ioread8(tc6393xb->scr + SCR_GPI_BCR(i));
	}
	ret = tcpd->suspend(dev);
	clk_disable(tc6393xb->clk);

	return ret;
}

static int tc6393xb_resume(struct platform_device *dev)
{
	struct tc6393xb_platform_data *tcpd = dev->dev.platform_data;
	struct tc6393xb *tc6393xb = platform_get_drvdata(dev);
	int ret;

	clk_enable(tc6393xb->clk);

	ret = tcpd->resume(dev);

	if (ret)
		return ret;

	return tc6393xb_hw_init(dev);
}
#else
#define tc6393xb_suspend NULL
#define tc6393xb_resume NULL
#endif

static struct platform_driver tc6393xb_driver = {
	.probe = tc6393xb_probe,
	.remove = __devexit_p(tc6393xb_remove),
	.suspend = tc6393xb_suspend,
	.resume = tc6393xb_resume,

	.driver = {
		.name = "tc6393xb",
		.owner = THIS_MODULE,
	},
};

static int __init tc6393xb_init(void)
{
	return platform_driver_register(&tc6393xb_driver);
}

static void __exit tc6393xb_exit(void)
{
	platform_driver_unregister(&tc6393xb_driver);
}

subsys_initcall(tc6393xb_init);
module_exit(tc6393xb_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov and Dirk Opfer");
MODULE_DESCRIPTION("tc6393xb Toshiba Mobile IO Controller");
MODULE_ALIAS("platform:tc6393xb");