aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/t7l66xb.c
blob: b32940ec903425d37010b79eed9a16e4b3c20761 (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
/*
 *
 * Toshiba T7L66XB core mfd support
 *
 * Copyright (c) 2005, 2007, 2008 Ian Molton
 * Copyright (c) 2008 Dmitry Baryshkov
 *
 * 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.
 *
 * T7L66 features:
 *
 * Supported in this driver:
 * SD/MMC
 * SM/NAND flash controller
 *
 * As yet not supported
 * GPIO interface (on NAND pins)
 * Serial interface
 * TFT 'interface converter'
 * PCMCIA interface logic
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mfd/t7l66xb.h>

enum {
	T7L66XB_CELL_NAND,
	T7L66XB_CELL_MMC,
};

static const struct resource t7l66xb_mmc_resources[] = {
	{
		.start = 0x800,
		.end	= 0x9ff,
		.flags = IORESOURCE_MEM,
	},
	{
		.start = IRQ_T7L66XB_MMC,
		.end	= IRQ_T7L66XB_MMC,
		.flags = IORESOURCE_IRQ,
	},
};

#define SCR_REVID	0x08		/* b Revision ID	*/
#define SCR_IMR		0x42		/* b Interrupt Mask	*/
#define SCR_DEV_CTL	0xe0		/* b Device control	*/
#define SCR_ISR		0xe1		/* b Interrupt Status	*/
#define SCR_GPO_OC	0xf0		/* b GPO output control	*/
#define SCR_GPO_OS	0xf1		/* b GPO output enable	*/
#define SCR_GPI_S	0xf2		/* w GPI status		*/
#define SCR_APDC	0xf8		/* b Active pullup down ctrl */

#define SCR_DEV_CTL_USB		BIT(0)	/* USB enable		*/
#define SCR_DEV_CTL_MMC		BIT(1)	/* MMC enable		*/

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

struct t7l66xb {
	void __iomem		*scr;
	/* Lock to protect registers requiring read/modify/write ops. */
	spinlock_t		lock;

	struct resource		rscr;
	struct clk		*clk48m;
	struct clk		*clk32k;
	int			irq;
	int			irq_base;
};

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

static int t7l66xb_mmc_enable(struct platform_device *mmc)
{
	struct platform_device *dev = to_platform_device(mmc->dev.parent);
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	unsigned long flags;
	u8 dev_ctl;

	clk_enable(t7l66xb->clk32k);

	spin_lock_irqsave(&t7l66xb->lock, flags);

	dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
	dev_ctl |= SCR_DEV_CTL_MMC;
	tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);

	spin_unlock_irqrestore(&t7l66xb->lock, flags);

	tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
		t7l66xb_mmc_resources[0].start & 0xfffe);

	return 0;
}

static int t7l66xb_mmc_disable(struct platform_device *mmc)
{
	struct platform_device *dev = to_platform_device(mmc->dev.parent);
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	unsigned long flags;
	u8 dev_ctl;

	spin_lock_irqsave(&t7l66xb->lock, flags);

	dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL);
	dev_ctl &= ~SCR_DEV_CTL_MMC;
	tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL);

	spin_unlock_irqrestore(&t7l66xb->lock, flags);

	clk_disable(t7l66xb->clk32k);

	return 0;
}

static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state)
{
	struct platform_device *dev = to_platform_device(mmc->dev.parent);
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);

	tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state);
}

static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state)
{
	struct platform_device *dev = to_platform_device(mmc->dev.parent);
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);

	tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state);
}

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

static struct tmio_mmc_data t7166xb_mmc_data = {
	.hclk = 24000000,
	.set_pwr = t7l66xb_mmc_pwr,
	.set_clk_div = t7l66xb_mmc_clk_div,
};

static const struct resource t7l66xb_nand_resources[] = {
	{
		.start	= 0xc00,
		.end	= 0xc07,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= 0x0100,
		.end	= 0x01ff,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= IRQ_T7L66XB_NAND,
		.end	= IRQ_T7L66XB_NAND,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct mfd_cell t7l66xb_cells[] = {
	[T7L66XB_CELL_MMC] = {
		.name = "tmio-mmc",
		.enable = t7l66xb_mmc_enable,
		.disable = t7l66xb_mmc_disable,
		.platform_data = &t7166xb_mmc_data,
		.pdata_size    = sizeof(t7166xb_mmc_data),
		.num_resources = ARRAY_SIZE(t7l66xb_mmc_resources),
		.resources = t7l66xb_mmc_resources,
	},
	[T7L66XB_CELL_NAND] = {
		.name = "tmio-nand",
		.num_resources = ARRAY_SIZE(t7l66xb_nand_resources),
		.resources = t7l66xb_nand_resources,
	},
};

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

/* Handle the T7L66XB interrupt mux */
static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc)
{
	struct t7l66xb *t7l66xb = irq_get_handler_data(irq);
	unsigned int isr;
	unsigned int i, irq_base;

	irq_base = t7l66xb->irq_base;

	while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) &
				~tmio_ioread8(t7l66xb->scr + SCR_IMR)))
		for (i = 0; i < T7L66XB_NR_IRQS; i++)
			if (isr & (1 << i))
				generic_handle_irq(irq_base + i);
}

static void t7l66xb_irq_mask(struct irq_data *data)
{
	struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
	unsigned long			flags;
	u8 imr;

	spin_lock_irqsave(&t7l66xb->lock, flags);
	imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
	imr |= 1 << (data->irq - t7l66xb->irq_base);
	tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
	spin_unlock_irqrestore(&t7l66xb->lock, flags);
}

static void t7l66xb_irq_unmask(struct irq_data *data)
{
	struct t7l66xb *t7l66xb = irq_data_get_irq_chip_data(data);
	unsigned long flags;
	u8 imr;

	spin_lock_irqsave(&t7l66xb->lock, flags);
	imr = tmio_ioread8(t7l66xb->scr + SCR_IMR);
	imr &= ~(1 << (data->irq - t7l66xb->irq_base));
	tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR);
	spin_unlock_irqrestore(&t7l66xb->lock, flags);
}

static struct irq_chip t7l66xb_chip = {
	.name		= "t7l66xb",
	.irq_ack	= t7l66xb_irq_mask,
	.irq_mask	= t7l66xb_irq_mask,
	.irq_unmask	= t7l66xb_irq_unmask,
};

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

/* Install the IRQ handler */
static void t7l66xb_attach_irq(struct platform_device *dev)
{
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	unsigned int irq, irq_base;

	irq_base = t7l66xb->irq_base;

	for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
		irq_set_chip_and_handler(irq, &t7l66xb_chip, handle_level_irq);
		irq_set_chip_data(irq, t7l66xb);
#ifdef CONFIG_ARM
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
#endif
	}

	irq_set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING);
	irq_set_handler_data(t7l66xb->irq, t7l66xb);
	irq_set_chained_handler(t7l66xb->irq, t7l66xb_irq);
}

static void t7l66xb_detach_irq(struct platform_device *dev)
{
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	unsigned int irq, irq_base;

	irq_base = t7l66xb->irq_base;

	irq_set_chained_handler(t7l66xb->irq, NULL);
	irq_set_handler_data(t7l66xb->irq, NULL);

	for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) {
#ifdef CONFIG_ARM
		set_irq_flags(irq, 0);
#endif
		irq_set_chip(irq, NULL);
		irq_set_chip_data(irq, NULL);
	}
}

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

#ifdef CONFIG_PM
static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state)
{
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	struct t7l66xb_platform_data *pdata = dev->dev.platform_data;

	if (pdata && pdata->suspend)
		pdata->suspend(dev);
	clk_disable(t7l66xb->clk48m);

	return 0;
}

static int t7l66xb_resume(struct platform_device *dev)
{
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	struct t7l66xb_platform_data *pdata = dev->dev.platform_data;

	clk_enable(t7l66xb->clk48m);
	if (pdata && pdata->resume)
		pdata->resume(dev);

	tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0,
		t7l66xb_mmc_resources[0].start & 0xfffe);

	return 0;
}
#else
#define t7l66xb_suspend NULL
#define t7l66xb_resume	NULL
#endif

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

static int t7l66xb_probe(struct platform_device *dev)
{
	struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
	struct t7l66xb *t7l66xb;
	struct resource *iomem, *rscr;
	int ret;

	if (pdata == NULL)
		return -EINVAL;

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

	t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL);
	if (!t7l66xb)
		return -ENOMEM;

	spin_lock_init(&t7l66xb->lock);

	platform_set_drvdata(dev, t7l66xb);

	ret = platform_get_irq(dev, 0);
	if (ret >= 0)
		t7l66xb->irq = ret;
	else
		goto err_noirq;

	t7l66xb->irq_base = pdata->irq_base;

	t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K");
	if (IS_ERR(t7l66xb->clk32k)) {
		ret = PTR_ERR(t7l66xb->clk32k);
		goto err_clk32k_get;
	}

	t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M");
	if (IS_ERR(t7l66xb->clk48m)) {
		ret = PTR_ERR(t7l66xb->clk48m);
		goto err_clk48m_get;
	}

	rscr = &t7l66xb->rscr;
	rscr->name = "t7l66xb-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;

	t7l66xb->scr = ioremap(rscr->start, resource_size(rscr));
	if (!t7l66xb->scr) {
		ret = -ENOMEM;
		goto err_ioremap;
	}

	clk_enable(t7l66xb->clk48m);

	if (pdata && pdata->enable)
		pdata->enable(dev);

	/* Mask all interrupts */
	tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR);

	printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n",
		dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID),
		(unsigned long)iomem->start, t7l66xb->irq);

	t7l66xb_attach_irq(dev);

	t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = pdata->nand_data;
	t7l66xb_cells[T7L66XB_CELL_NAND].pdata_size = sizeof(*pdata->nand_data);

	ret = mfd_add_devices(&dev->dev, dev->id,
			      t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells),
			      iomem, t7l66xb->irq_base, NULL);

	if (!ret)
		return 0;

	t7l66xb_detach_irq(dev);
	iounmap(t7l66xb->scr);
err_ioremap:
	release_resource(&t7l66xb->rscr);
err_request_scr:
	clk_put(t7l66xb->clk48m);
err_clk48m_get:
	clk_put(t7l66xb->clk32k);
err_clk32k_get:
err_noirq:
	kfree(t7l66xb);
	return ret;
}

static int t7l66xb_remove(struct platform_device *dev)
{
	struct t7l66xb_platform_data *pdata = dev->dev.platform_data;
	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
	int ret;

	ret = pdata->disable(dev);
	clk_disable(t7l66xb->clk48m);
	clk_put(t7l66xb->clk48m);
	clk_disable(t7l66xb->clk32k);
	clk_put(t7l66xb->clk32k);
	t7l66xb_detach_irq(dev);
	iounmap(t7l66xb->scr);
	release_resource(&t7l66xb->rscr);
	mfd_remove_devices(&dev->dev);
	platform_set_drvdata(dev, NULL);
	kfree(t7l66xb);

	return ret;

}

static struct platform_driver t7l66xb_platform_driver = {
	.driver = {
		.name	= "t7l66xb",
		.owner	= THIS_MODULE,
	},
	.suspend	= t7l66xb_suspend,
	.resume		= t7l66xb_resume,
	.probe		= t7l66xb_probe,
	.remove		= t7l66xb_remove,
};

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

module_platform_driver(t7l66xb_platform_driver);

MODULE_DESCRIPTION("Toshiba T7L66XB core driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Ian Molton");
MODULE_ALIAS("platform:t7l66xb");