aboutsummaryrefslogtreecommitdiff
path: root/sound/soc/fsl/imx-pcm-fiq.c
blob: 22c6130957ba429626004f310469ac94444f56be (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
/*
 * imx-pcm-fiq.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
 *
 * This code is based on code copyrighted by Freescale,
 * Liam Girdwood, Javier Martin and probably others.
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <asm/fiq.h>

#include <mach/irqs.h>
#include <linux/platform_data/asoc-imx-ssi.h>

#include "imx-ssi.h"

struct imx_pcm_runtime_data {
	int period;
	int periods;
	unsigned long offset;
	unsigned long last_offset;
	unsigned long size;
	struct hrtimer hrt;
	int poll_time_ns;
	struct snd_pcm_substream *substream;
	atomic_t running;
};

static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
{
	struct imx_pcm_runtime_data *iprtd =
		container_of(hrt, struct imx_pcm_runtime_data, hrt);
	struct snd_pcm_substream *substream = iprtd->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pt_regs regs;
	unsigned long delta;

	if (!atomic_read(&iprtd->running))
		return HRTIMER_NORESTART;

	get_fiq_regs(&regs);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		iprtd->offset = regs.ARM_r8 & 0xffff;
	else
		iprtd->offset = regs.ARM_r9 & 0xffff;

	/* How much data have we transferred since the last period report? */
	if (iprtd->offset >= iprtd->last_offset)
		delta = iprtd->offset - iprtd->last_offset;
	else
		delta = runtime->buffer_size + iprtd->offset
			- iprtd->last_offset;

	/* If we've transferred at least a period then report it and
	 * reset our poll time */
	if (delta >= iprtd->period) {
		snd_pcm_period_elapsed(substream);
		iprtd->last_offset = iprtd->offset;
	}

	hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));

	return HRTIMER_RESTART;
}

static struct fiq_handler fh = {
	.name		= DRV_NAME,
};

static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	iprtd->size = params_buffer_bytes(params);
	iprtd->periods = params_periods(params);
	iprtd->period = params_period_bytes(params) ;
	iprtd->offset = 0;
	iprtd->last_offset = 0;
	iprtd->poll_time_ns = 1000000000 / params_rate(params) *
				params_period_size(params);
	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	return 0;
}

static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	struct pt_regs regs;

	get_fiq_regs(&regs);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
	else
		regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;

	set_fiq_regs(&regs);

	return 0;
}

static int fiq_enable;
static int imx_pcm_fiq;

static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		atomic_set(&iprtd->running, 1);
		hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
		      HRTIMER_MODE_REL);
		if (++fiq_enable == 1)
			enable_fiq(imx_pcm_fiq);

		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		atomic_set(&iprtd->running, 0);

		if (--fiq_enable == 0)
			disable_fiq(imx_pcm_fiq);

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	return bytes_to_frames(substream->runtime, iprtd->offset);
}

static struct snd_pcm_hardware snd_imx_hardware = {
	.info = SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID |
		SNDRV_PCM_INFO_PAUSE |
		SNDRV_PCM_INFO_RESUME,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rate_min = 8000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	.period_bytes_min = 128,
	.period_bytes_max = 16 * 1024,
	.periods_min = 4,
	.periods_max = 255,
	.fifo_size = 0,
};

static int snd_imx_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd;
	int ret;

	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
	if (iprtd == NULL)
		return -ENOMEM;
	runtime->private_data = iprtd;

	iprtd->substream = substream;

	atomic_set(&iprtd->running, 0);
	hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	iprtd->hrt.function = snd_hrtimer_callback;

	ret = snd_pcm_hw_constraint_integer(substream->runtime,
			SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0) {
		kfree(iprtd);
		return ret;
	}

	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
	return 0;
}

static int snd_imx_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;

	hrtimer_cancel(&iprtd->hrt);

	kfree(iprtd);

	return 0;
}

static struct snd_pcm_ops imx_pcm_ops = {
	.open		= snd_imx_open,
	.close		= snd_imx_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= snd_imx_pcm_hw_params,
	.prepare	= snd_imx_pcm_prepare,
	.trigger	= snd_imx_pcm_trigger,
	.pointer	= snd_imx_pcm_pointer,
	.mmap		= snd_imx_pcm_mmap,
};

static int ssi_irq = 0;

static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_pcm *pcm = rtd->pcm;
	struct snd_pcm_substream *substream;
	int ret;

	ret = imx_pcm_new(rtd);
	if (ret)
		return ret;

	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
	if (substream) {
		struct snd_dma_buffer *buf = &substream->dma_buffer;

		imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
	}

	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
	if (substream) {
		struct snd_dma_buffer *buf = &substream->dma_buffer;

		imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
	}

	set_fiq_handler(&imx_ssi_fiq_start,
		&imx_ssi_fiq_end - &imx_ssi_fiq_start);

	return 0;
}

static void imx_pcm_fiq_free(struct snd_pcm *pcm)
{
	mxc_set_irq_fiq(ssi_irq, 0);
	release_fiq(&fh);
	imx_pcm_free(pcm);
}

static struct snd_soc_platform_driver imx_soc_platform_fiq = {
	.ops		= &imx_pcm_ops,
	.pcm_new	= imx_pcm_fiq_new,
	.pcm_free	= imx_pcm_fiq_free,
};

static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
{
	struct imx_ssi *ssi = platform_get_drvdata(pdev);
	int ret;

	ret = claim_fiq(&fh);
	if (ret) {
		dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
		return ret;
	}

	mxc_set_irq_fiq(ssi->irq, 1);
	ssi_irq = ssi->irq;

	imx_pcm_fiq = ssi->irq;

	imx_ssi_fiq_base = (unsigned long)ssi->base;

	ssi->dma_params_tx.burstsize = 4;
	ssi->dma_params_rx.burstsize = 6;

	ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
	if (ret)
		goto failed_register;

	return 0;

failed_register:
	mxc_set_irq_fiq(ssi_irq, 0);
	release_fiq(&fh);

	return ret;
}

static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver imx_pcm_driver = {
	.driver = {
			.name = "imx-fiq-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = imx_soc_platform_probe,
	.remove = __devexit_p(imx_soc_platform_remove),
};

module_platform_driver(imx_pcm_driver);

MODULE_LICENSE("GPL");