[net-next-2.6.git] / sound / soc / imx / imx-pcm-fiq.c

/*
 * 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/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 timer_list timer;
	int poll_time;
};

static inline void imx_ssi_set_next_poll(struct imx_pcm_runtime_data *iprtd)
{
	iprtd->timer.expires = jiffies + iprtd->poll_time;
}

static void imx_ssi_timer_callback(unsigned long data)
{
	struct snd_pcm_substream *substream = (void *)data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	struct pt_regs regs;
	unsigned long delta;

	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 >= runtime->period_size) {
		snd_pcm_period_elapsed(substream);
		iprtd->last_offset = iprtd->offset;

		imx_ssi_set_next_poll(iprtd);
	}

	/* Restart the timer; if we didn't report we'll run on the next tick */
	add_timer(&iprtd->timer);

}

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 = HZ / (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:
		imx_ssi_set_next_poll(iprtd);
		add_timer(&iprtd->timer);
		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:
		del_timer(&iprtd->timer);
		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 = 2,
	.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);
	runtime->private_data = iprtd;

	init_timer(&iprtd->timer);
	iprtd->timer.data = (unsigned long)substream;
	iprtd->timer.function = imx_ssi_timer_callback;

	ret = snd_pcm_hw_constraint_integer(substream->runtime,
			SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		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;

	del_timer_sync(&iprtd->timer);
	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 imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai,
	struct snd_pcm *pcm)
{
	int ret;

	ret = imx_pcm_new(card, dai, pcm);
	if (ret)
		return ret;

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

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

	if (dai->capture.channels_min) {
		struct snd_pcm_substream *substream =
			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].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 struct snd_soc_platform imx_soc_platform_fiq = {
	.pcm_ops 	= &imx_pcm_ops,
	.pcm_new	= imx_pcm_fiq_new,
	.pcm_free	= imx_pcm_free,
};

struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,
		struct imx_ssi *ssi)
{
	int ret = 0;

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

	mxc_set_irq_fiq(ssi->irq, 1);

	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;

	return &imx_soc_platform_fiq;
}

void imx_ssi_fiq_exit(struct platform_device *pdev,
		struct imx_ssi *ssi)
{
	mxc_set_irq_fiq(ssi->irq, 0);
	release_fiq(&fh);
}
Commit	Line	Data
8380222e SH	1	/*
	2	* imx-pcm-fiq.c -- ALSA Soc Audio Layer
	3	*
	4	* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
	5	*
	6	* This code is based on code copyrighted by Freescale,
	7	* Liam Girdwood, Javier Martin and probably others.
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*/
	14	#include <linux/clk.h>
	15	#include <linux/delay.h>
	16	#include <linux/device.h>
	17	#include <linux/dma-mapping.h>
	18	#include <linux/init.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/module.h>
	21	#include <linux/platform_device.h>
5a0e3ad6	22	#include <linux/slab.h>
8380222e SH	23
	24	#include <sound/core.h>
	25	#include <sound/initval.h>
	26	#include <sound/pcm.h>
	27	#include <sound/pcm_params.h>
	28	#include <sound/soc.h>
	29
	30	#include <asm/fiq.h>
	31
	32	#include <mach/ssi.h>
	33
	34	#include "imx-ssi.h"
	35
	36	struct imx_pcm_runtime_data {
	37	int period;
	38	int periods;
8380222e	39	unsigned long offset;
b4e82b5b	40	unsigned long last_offset;
8380222e	41	unsigned long size;
8380222e	42	struct timer_list timer;
b4e82b5b	43	int poll_time;
8380222e SH	44	};
8380222e SH	45
b4e82b5b MB	46	static inline void imx_ssi_set_next_poll(struct imx_pcm_runtime_data *iprtd)
	47	{
	48	iprtd->timer.expires = jiffies + iprtd->poll_time;
	49	}
	50
8380222e SH	51	static void imx_ssi_timer_callback(unsigned long data)
	52	{
	53	struct snd_pcm_substream substream = (void )data;
	54	struct snd_pcm_runtime *runtime = substream->runtime;
	55	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	56	struct pt_regs regs;
b4e82b5b	57	unsigned long delta;
8380222e SH	58
	59	get_fiq_regs(&regs);
	60
	61	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	62	iprtd->offset = regs.ARM_r8 & 0xffff;
	63	else
	64	iprtd->offset = regs.ARM_r9 & 0xffff;
	65
b4e82b5b MB	66	/* How much data have we transferred since the last period report? */
	67	if (iprtd->offset >= iprtd->last_offset)
	68	delta = iprtd->offset - iprtd->last_offset;
	69	else
	70	delta = runtime->buffer_size + iprtd->offset
	71	- iprtd->last_offset;
	72
	73	/* If we've transferred at least a period then report it and
	74	* reset our poll time */
	75	if (delta >= runtime->period_size) {
	76	snd_pcm_period_elapsed(substream);
	77	iprtd->last_offset = iprtd->offset;
	78
	79	imx_ssi_set_next_poll(iprtd);
	80	}
	81
	82	/* Restart the timer; if we didn't report we'll run on the next tick */
8380222e	83	add_timer(&iprtd->timer);
b4e82b5b	84
8380222e SH	85	}
	86
	87	static struct fiq_handler fh = {
	88	.name = DRV_NAME,
	89	};
	90
	91	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	92	struct snd_pcm_hw_params *params)
	93	{
	94	struct snd_pcm_runtime *runtime = substream->runtime;
	95	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	96
	97	iprtd->size = params_buffer_bytes(params);
	98	iprtd->periods = params_periods(params);
b4e82b5b	99	iprtd->period = params_period_bytes(params) ;
8380222e	100	iprtd->offset = 0;
b4e82b5b MB	101	iprtd->last_offset = 0;
b4e82b5b MB	102	iprtd->poll_time = HZ / (params_rate(params) / params_period_size(params));
8380222e SH	103
	104	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	105
	106	return 0;
	107	}
	108
	109	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
	110	{
	111	struct snd_pcm_runtime *runtime = substream->runtime;
	112	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	113	struct pt_regs regs;
	114
	115	get_fiq_regs(&regs);
	116	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	117	regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
	118	else
	119	regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
	120
	121	set_fiq_regs(&regs);
	122
	123	return 0;
	124	}
	125
	126	static int fiq_enable;
	127	static int imx_pcm_fiq;
	128
	129	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	130	{
	131	struct snd_pcm_runtime *runtime = substream->runtime;
	132	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	133
	134	switch (cmd) {
	135	case SNDRV_PCM_TRIGGER_START:
	136	case SNDRV_PCM_TRIGGER_RESUME:
	137	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
b4e82b5b	138	imx_ssi_set_next_poll(iprtd);
8380222e SH	139	add_timer(&iprtd->timer);
	140	if (++fiq_enable == 1)
	141	enable_fiq(imx_pcm_fiq);
	142
	143	break;
	144
	145	case SNDRV_PCM_TRIGGER_STOP:
	146	case SNDRV_PCM_TRIGGER_SUSPEND:
	147	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	148	del_timer(&iprtd->timer);
	149	if (--fiq_enable == 0)
	150	disable_fiq(imx_pcm_fiq);
	151
	152
	153	break;
	154	default:
	155	return -EINVAL;
	156	}
	157
	158	return 0;
	159	}
	160
	161	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	162	{
	163	struct snd_pcm_runtime *runtime = substream->runtime;
	164	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	165
	166	return bytes_to_frames(substream->runtime, iprtd->offset);
	167	}
	168
	169	static struct snd_pcm_hardware snd_imx_hardware = {
	170	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	171	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	172	SNDRV_PCM_INFO_MMAP \|
	173	SNDRV_PCM_INFO_MMAP_VALID \|
	174	SNDRV_PCM_INFO_PAUSE \|
	175	SNDRV_PCM_INFO_RESUME,
	176	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	177	.rate_min = 8000,
	178	.channels_min = 2,
	179	.channels_max = 2,
	180	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	181	.period_bytes_min = 128,
	182	.period_bytes_max = 16 * 1024,
	183	.periods_min = 2,
	184	.periods_max = 255,
	185	.fifo_size = 0,
	186	};
	187
	188	static int snd_imx_open(struct snd_pcm_substream *substream)
	189	{
	190	struct snd_pcm_runtime *runtime = substream->runtime;
	191	struct imx_pcm_runtime_data *iprtd;
	192	int ret;
	193
	194	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
	195	runtime->private_data = iprtd;
	196
	197	init_timer(&iprtd->timer);
	198	iprtd->timer.data = (unsigned long)substream;
	199	iprtd->timer.function = imx_ssi_timer_callback;
	200
	201	ret = snd_pcm_hw_constraint_integer(substream->runtime,
	202	SNDRV_PCM_HW_PARAM_PERIODS);
203	if (ret < 0)
204	return ret;
205
206	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
207	return 0;
208	}
209
210	static int snd_imx_close(struct snd_pcm_substream *substream)
211	{
212	struct snd_pcm_runtime *runtime = substream->runtime;
213	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
214
215	del_timer_sync(&iprtd->timer);
216	kfree(iprtd);
217
218	return 0;
219	}
220
221	static struct snd_pcm_ops imx_pcm_ops = {
222	.open = snd_imx_open,
223	.close = snd_imx_close,
224	.ioctl = snd_pcm_lib_ioctl,
225	.hw_params = snd_imx_pcm_hw_params,
226	.prepare = snd_imx_pcm_prepare,
227	.trigger = snd_imx_pcm_trigger,
228	.pointer = snd_imx_pcm_pointer,
229	.mmap = snd_imx_pcm_mmap,
230	};
231
232	static int imx_pcm_fiq_new(struct snd_card card, struct snd_soc_dai dai,
233	struct snd_pcm *pcm)
234	{
235	int ret;
236
237	ret = imx_pcm_new(card, dai, pcm);
238	if (ret)
239	return ret;
240
241	if (dai->playback.channels_min) {
242	struct snd_pcm_substream *substream =
243	pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
244	struct snd_dma_buffer *buf = &substream->dma_buffer;
245
246	imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
247	}
248
249	if (dai->capture.channels_min) {
250	struct snd_pcm_substream *substream =
251	pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
252	struct snd_dma_buffer *buf = &substream->dma_buffer;
253
254	imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
255	}
256
257	set_fiq_handler(&imx_ssi_fiq_start,
258	&imx_ssi_fiq_end - &imx_ssi_fiq_start);
259
260	return 0;
261	}
262
263	static struct snd_soc_platform imx_soc_platform_fiq = {
264	.pcm_ops = &imx_pcm_ops,
265	.pcm_new = imx_pcm_fiq_new,
266	.pcm_free = imx_pcm_free,
267	};
268
269	struct snd_soc_platform imx_ssi_fiq_init(struct platform_device pdev,
270	struct imx_ssi *ssi)
271	{
272	int ret = 0;
273
274	ret = claim_fiq(&fh);
275	if (ret) {
276	dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
277	return ERR_PTR(ret);
278	}
279
280	mxc_set_irq_fiq(ssi->irq, 1);
281
282	imx_pcm_fiq = ssi->irq;
283
284	imx_ssi_fiq_base = (unsigned long)ssi->base;
285
286	ssi->dma_params_tx.burstsize = 4;
287	ssi->dma_params_rx.burstsize = 6;
288
289	return &imx_soc_platform_fiq;
290	}
291
292	void imx_ssi_fiq_exit(struct platform_device *pdev,
293	struct imx_ssi *ssi)
294	{
295	mxc_set_irq_fiq(ssi->irq, 0);
296	release_fiq(&fh);
297	}
298