aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/omap/mcpdm.c
blob: 90b8bf71c893be74903209f94b5f1aef17bc0171 (plain) (blame)
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
/*
 * mcpdm.c  --	McPDM interface driver
 *
 * Author: Jorge Eduardo Candelaria <x0107209@ti.com>
 * Copyright (C) 2009 - Texas Instruments, 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/irq.h>

#include "mcpdm.h"

static struct omap_mcpdm *mcpdm;

static inline void omap_mcpdm_write(u16 reg, u32 val)
{
	__raw_writel(val, mcpdm->io_base + reg);
}

static inline int omap_mcpdm_read(u16 reg)
{
	return __raw_readl(mcpdm->io_base + reg);
}

static void omap_mcpdm_reg_dump(void)
{
	dev_dbg(mcpdm->dev, "***********************\n");
	dev_dbg(mcpdm->dev, "IRQSTATUS_RAW:  0x%04x\n",
			omap_mcpdm_read(MCPDM_IRQSTATUS_RAW));
	dev_dbg(mcpdm->dev, "IRQSTATUS:	0x%04x\n",
			omap_mcpdm_read(MCPDM_IRQSTATUS));
	dev_dbg(mcpdm->dev, "IRQENABLE_SET:  0x%04x\n",
			omap_mcpdm_read(MCPDM_IRQENABLE_SET));
	dev_dbg(mcpdm->dev, "IRQENABLE_CLR:  0x%04x\n",
			omap_mcpdm_read(MCPDM_IRQENABLE_CLR));
	dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
			omap_mcpdm_read(MCPDM_IRQWAKE_EN));
	dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
			omap_mcpdm_read(MCPDM_DMAENABLE_SET));
	dev_dbg(mcpdm->dev, "DMAENABLE_CLR:  0x%04x\n",
			omap_mcpdm_read(MCPDM_DMAENABLE_CLR));
	dev_dbg(mcpdm->dev, "DMAWAKEEN:	0x%04x\n",
			omap_mcpdm_read(MCPDM_DMAWAKEEN));
	dev_dbg(mcpdm->dev, "CTRL:	0x%04x\n",
			omap_mcpdm_read(MCPDM_CTRL));
	dev_dbg(mcpdm->dev, "DN_DATA:  0x%04x\n",
			omap_mcpdm_read(MCPDM_DN_DATA));
	dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
			omap_mcpdm_read(MCPDM_UP_DATA));
	dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
			omap_mcpdm_read(MCPDM_FIFO_CTRL_DN));
	dev_dbg(mcpdm->dev, "FIFO_CTRL_UP:  0x%04x\n",
			omap_mcpdm_read(MCPDM_FIFO_CTRL_UP));
	dev_dbg(mcpdm->dev, "DN_OFFSET:	0x%04x\n",
			omap_mcpdm_read(MCPDM_DN_OFFSET));
	dev_dbg(mcpdm->dev, "***********************\n");
}

/*
 * Takes the McPDM module in and out of reset state.
 * Uplink and downlink can be reset individually.
 */
static void omap_mcpdm_reset_capture(int reset)
{
	int ctrl = omap_mcpdm_read(MCPDM_CTRL);

	if (reset)
		ctrl |= SW_UP_RST;
	else
		ctrl &= ~SW_UP_RST;

	omap_mcpdm_write(MCPDM_CTRL, ctrl);
}

static void omap_mcpdm_reset_playback(int reset)
{
	int ctrl = omap_mcpdm_read(MCPDM_CTRL);

	if (reset)
		ctrl |= SW_DN_RST;
	else
		ctrl &= ~SW_DN_RST;

	omap_mcpdm_write(MCPDM_CTRL, ctrl);
}

/*
 * Enables the transfer through the PDM interface to/from the Phoenix
 * codec by enabling the corresponding UP or DN channels.
 */
void omap_mcpdm_start(int stream)
{
	int ctrl = omap_mcpdm_read(MCPDM_CTRL);

	if (stream)
		ctrl |= mcpdm->up_channels;
	else
		ctrl |= mcpdm->dn_channels;

	omap_mcpdm_write(MCPDM_CTRL, ctrl);
}

/*
 * Disables the transfer through the PDM interface to/from the Phoenix
 * codec by disabling the corresponding UP or DN channels.
 */
void omap_mcpdm_stop(int stream)
{
	int ctrl = omap_mcpdm_read(MCPDM_CTRL);

	if (stream)
		ctrl &= ~mcpdm->up_channels;
	else
		ctrl &= ~mcpdm->dn_channels;

	omap_mcpdm_write(MCPDM_CTRL, ctrl);
}

/*
 * Configures McPDM uplink for audio recording.
 * This function should be called before omap_mcpdm_start.
 */
int omap_mcpdm_capture_open(struct omap_mcpdm_link *uplink)
{
	int irq_mask = 0;
	int ctrl;

	if (!uplink)
		return -EINVAL;

	mcpdm->uplink = uplink;

	/* Enable irq request generation */
	irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
	omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);

	/* Configure uplink threshold */
	if (uplink->threshold > UP_THRES_MAX)
		uplink->threshold = UP_THRES_MAX;

	omap_mcpdm_write(MCPDM_FIFO_CTRL_UP, uplink->threshold);

	/* Configure DMA controller */
	omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_UP_ENABLE);

	/* Set pdm out format */
	ctrl = omap_mcpdm_read(MCPDM_CTRL);
	ctrl &= ~PDMOUTFORMAT;
	ctrl |= uplink->format & PDMOUTFORMAT;

	/* Uplink channels */
	mcpdm->up_channels = uplink->channels & (PDM_UP_MASK | PDM_STATUS_MASK);

	omap_mcpdm_write(MCPDM_CTRL, ctrl);

	return 0;
}

/*
 * Configures McPDM downlink for audio playback.
 * This function should be called before omap_mcpdm_start.
 */
int omap_mcpdm_playback_open(struct omap_mcpdm_link *downlink)
{
	int irq_mask = 0;
	int ctrl;

	if (!downlink)
		return -EINVAL;

	mcpdm->downlink = downlink;

	/* Enable irq request generation */
	irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
	omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);

	/* Configure uplink threshold */
	if (downlink->threshold > DN_THRES_MAX)
		downlink->threshold = DN_THRES_MAX;

	omap_mcpdm_write(MCPDM_FIFO_CTRL_DN, downlink->threshold);

	/* Enable DMA request generation */
	omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_DN_ENABLE);

	/* Set pdm out format */
	ctrl = omap_mcpdm_read(MCPDM_CTRL);
	ctrl &= ~PDMOUTFORMAT;
	ctrl |= downlink->format & PDMOUTFORMAT;

	/* Downlink channels */
	mcpdm->dn_channels = downlink->channels & (PDM_DN_MASK | PDM_CMD_MASK);

	omap_mcpdm_write(MCPDM_CTRL, ctrl);

	return 0;
}

/*
 * Cleans McPDM uplink configuration.
 * This function should be called when the stream is closed.
 */
int omap_mcpdm_capture_close(struct omap_mcpdm_link *uplink)
{
	int irq_mask = 0;

	if (!uplink)
		return -EINVAL;

	/* Disable irq request generation */
	irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
	omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);

	/* Disable DMA request generation */
	omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_UP_ENABLE);

	/* Clear Downlink channels */
	mcpdm->up_channels = 0;

	mcpdm->uplink = NULL;

	return 0;
}

/*
 * Cleans McPDM downlink configuration.
 * This function should be called when the stream is closed.
 */
int omap_mcpdm_playback_close(struct omap_mcpdm_link *downlink)
{
	int irq_mask = 0;

	if (!downlink)
		return -EINVAL;

	/* Disable irq request generation */
	irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
	omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);

	/* Disable DMA request generation */
	omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_DN_ENABLE);

	/* clear Downlink channels */
	mcpdm->dn_channels = 0;

	mcpdm->downlink = NULL;

	return 0;
}

static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
{
	struct omap_mcpdm *mcpdm_irq = dev_id;
	int irq_status;

	irq_status = omap_mcpdm_read(MCPDM_IRQSTATUS);

	/* Acknowledge irq event */
	omap_mcpdm_write(MCPDM_IRQSTATUS, irq_status);

	if (irq & MCPDM_DN_IRQ_FULL) {
		dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
		omap_mcpdm_reset_playback(1);
		omap_mcpdm_playback_open(mcpdm_irq->downlink);
		omap_mcpdm_reset_playback(0);
	}

	if (irq & MCPDM_DN_IRQ_EMPTY) {
		dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
		omap_mcpdm_reset_playback(1);
		omap_mcpdm_playback_open(mcpdm_irq->downlink);
		omap_mcpdm_reset_playback(0);
	}

	if (irq & MCPDM_DN_IRQ) {
		dev_dbg(mcpdm_irq->dev, "DN write request\n");
	}

	if (irq & MCPDM_UP_IRQ_FULL) {
		dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
		omap_mcpdm_reset_capture(1);
		omap_mcpdm_capture_open(mcpdm_irq->uplink);
		omap_mcpdm_reset_capture(0);
	}

	if (irq & MCPDM_UP_IRQ_EMPTY) {
		dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
		omap_mcpdm_reset_capture(1);
		omap_mcpdm_capture_open(mcpdm_irq->uplink);
		omap_mcpdm_reset_capture(0);
	}

	if (irq & MCPDM_UP_IRQ) {
		dev_dbg(mcpdm_irq->dev, "UP write request\n");
	}

	return IRQ_HANDLED;
}

int omap_mcpdm_request(void)
{
	int ret;

	clk_enable(mcpdm->clk);

	spin_lock(&mcpdm->lock);

	if (!mcpdm->free) {
		dev_err(mcpdm->dev, "McPDM interface is in use\n");
		spin_unlock(&mcpdm->lock);
		ret = -EBUSY;
		goto err;
	}
	mcpdm->free = 0;

	spin_unlock(&mcpdm->lock);

	/* Disable lines while request is ongoing */
	omap_mcpdm_write(MCPDM_CTRL, 0x00);

	ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler,
				0, "McPDM", (void *)mcpdm);
	if (ret) {
		dev_err(mcpdm->dev, "Request for McPDM IRQ failed\n");
		goto err;
	}

	return 0;

err:
	clk_disable(mcpdm->clk);
	return ret;
}

void omap_mcpdm_free(void)
{
	spin_lock(&mcpdm->lock);
	if (mcpdm->free) {
		dev_err(mcpdm->dev, "McPDM interface is already free\n");
		spin_unlock(&mcpdm->lock);
		return;
	}
	mcpdm->free = 1;
	spin_unlock(&mcpdm->lock);

	clk_disable(mcpdm->clk);

	free_irq(mcpdm->irq, (void *)mcpdm);
}

/* Enable/disable DC offset cancelation for the analog
 * headset path (PDM channels 1 and 2).
 */
int omap_mcpdm_set_offset(int offset1, int offset2)
{
	int offset;

	if ((offset1 > DN_OFST_MAX) || (offset2 > DN_OFST_MAX))
		return -EINVAL;

	offset = (offset1 << DN_OFST_RX1) | (offset2 << DN_OFST_RX2);

	/* offset cancellation for channel 1 */
	if (offset1)
		offset |= DN_OFST_RX1_EN;
	else
		offset &= ~DN_OFST_RX1_EN;

	/* offset cancellation for channel 2 */
	if (offset2)
		offset |= DN_OFST_RX2_EN;
	else
		offset &= ~DN_OFST_RX2_EN;

	omap_mcpdm_write(MCPDM_DN_OFFSET, offset);

	return 0;
}

static int __devinit omap_mcpdm_probe(struct platform_device *pdev)
{
	struct resource *res;
	int ret = 0;

	mcpdm = kzalloc(sizeof(struct omap_mcpdm), GFP_KERNEL);
	if (!mcpdm) {
		ret = -ENOMEM;
		goto exit;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(&pdev->dev, "no resource\n");
		goto err_resource;
	}

	spin_lock_init(&mcpdm->lock);
	mcpdm->free = 1;
	mcpdm->io_base = ioremap(res->start, resource_size(res));
	if (!mcpdm->io_base) {
		ret = -ENOMEM;
		goto err_resource;
	}

	mcpdm->irq = platform_get_irq(pdev, 0);

	mcpdm->clk = clk_get(&pdev->dev, "pdm_ck");
	if (IS_ERR(mcpdm->clk)) {
		ret = PTR_ERR(mcpdm->clk);
		dev_err(&pdev->dev, "unable to get pdm_ck: %d\n", ret);
		goto err_clk;
	}

	mcpdm->dev = &pdev->dev;
	platform_set_drvdata(pdev, mcpdm);

	return 0;

err_clk:
	iounmap(mcpdm->io_base);
err_resource:
	kfree(mcpdm);
exit:
	return ret;
}

static int __devexit omap_mcpdm_remove(struct platform_device *pdev)
{
	struct omap_mcpdm *mcpdm_ptr = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	clk_put(mcpdm_ptr->clk);

	iounmap(mcpdm_ptr->io_base);

	mcpdm_ptr->clk = NULL;
	mcpdm_ptr->free = 0;
	mcpdm_ptr->dev = NULL;

	kfree(mcpdm_ptr);

	return 0;
}

static struct platform_driver omap_mcpdm_driver = {
	.probe = omap_mcpdm_probe,
	.remove = __devexit_p(omap_mcpdm_remove),
	.driver = {
		.name = "omap-mcpdm",
	},
};

static struct platform_device *omap_mcpdm_device;

static int __init omap_mcpdm_init(void)
{
	return platform_driver_register(&omap_mcpdm_driver);
}
arch_initcall(omap_mcpdm_init);