[deliverable/linux.git] / sound / soc / fsl / 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/dmaengine_pcm.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <asm/fiq.h>

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

#include "imx-ssi.h"
#include "imx-pcm.h"

struct imx_pcm_runtime_data {
	unsigned 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 int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
		struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret;

	ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
		runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);

	pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
			runtime->dma_area,
			runtime->dma_addr,
			runtime->dma_bytes);
	return ret;
}

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_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	size_t size = IMX_SSI_DMABUF_SIZE;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
					   &buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;
	buf->bytes = size;

	return 0;
}

static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);

static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &imx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
		ret = imx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
		ret = imx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}

out:
	return ret;
}

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_free(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;

	for (stream = 0; stream < 2; stream++) {
		substream = pcm->streams[stream].substream;
		if (!substream)
			continue;

		buf = &substream->dma_buffer;
		if (!buf->area)
			continue;

		dma_free_writecombine(pcm->card->dev, buf->bytes,
				      buf->area, buf->addr);
		buf->area = NULL;
	}
}

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,
};

int imx_pcm_fiq_init(struct platform_device *pdev,
		struct imx_pcm_fiq_params *params)
{
	int ret;

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

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

	imx_pcm_fiq = params->irq;

	imx_ssi_fiq_base = (unsigned long)params->base;

	params->dma_params_tx->maxburst = 4;
	params->dma_params_rx->maxburst = 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;
}
EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);

void imx_pcm_fiq_exit(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
}
EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);

MODULE_LICENSE("GPL");
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
8380222e SH	24	#include <sound/core.h>
9051cba1	25	#include <sound/dmaengine_pcm.h>
8380222e SH	26	#include <sound/initval.h>
	27	#include <sound/pcm.h>
	28	#include <sound/pcm_params.h>
	29	#include <sound/soc.h>
	30
	31	#include <asm/fiq.h>
	32
82906b13	33	#include <linux/platform_data/asoc-imx-ssi.h>
8380222e SH	34
8380222e SH	35	#include "imx-ssi.h"
9051cba1	36	#include "imx-pcm.h"
8380222e SH	37
8380222e SH	38	struct imx_pcm_runtime_data {
2fb14880	39	unsigned int period;
8380222e	40	int periods;
8380222e	41	unsigned long offset;
b4e82b5b	42	unsigned long last_offset;
8380222e	43	unsigned long size;
43a3cec0 SH	44	struct hrtimer hrt;
	45	int poll_time_ns;
	46	struct snd_pcm_substream *substream;
83926099	47	atomic_t running;
8380222e SH	48	};
8380222e SH	49
43a3cec0	50	static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
b4e82b5b	51	{
43a3cec0 SH	52	struct imx_pcm_runtime_data *iprtd =
	53	container_of(hrt, struct imx_pcm_runtime_data, hrt);
	54	struct snd_pcm_substream *substream = iprtd->substream;
8380222e	55	struct snd_pcm_runtime *runtime = substream->runtime;
8380222e	56	struct pt_regs regs;
b4e82b5b	57	unsigned long delta;
8380222e	58
83926099 SH	59	if (!atomic_read(&iprtd->running))
	60	return HRTIMER_NORESTART;
	61
8380222e SH	62	get_fiq_regs(&regs);
	63
	64	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	65	iprtd->offset = regs.ARM_r8 & 0xffff;
	66	else
	67	iprtd->offset = regs.ARM_r9 & 0xffff;
	68
b4e82b5b MB	69	/* How much data have we transferred since the last period report? */
	70	if (iprtd->offset >= iprtd->last_offset)
	71	delta = iprtd->offset - iprtd->last_offset;
	72	else
	73	delta = runtime->buffer_size + iprtd->offset
	74	- iprtd->last_offset;
	75
	76	/* If we've transferred at least a period then report it and
	77	* reset our poll time */
43a3cec0	78	if (delta >= iprtd->period) {
b4e82b5b MB	79	snd_pcm_period_elapsed(substream);
b4e82b5b MB	80	iprtd->last_offset = iprtd->offset;
b4e82b5b MB	81	}
b4e82b5b MB	82
43a3cec0	83	hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
b4e82b5b	84
43a3cec0	85	return HRTIMER_RESTART;
8380222e SH	86	}
	87
	88	static struct fiq_handler fh = {
	89	.name = DRV_NAME,
	90	};
	91
	92	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	93	struct snd_pcm_hw_params *params)
	94	{
	95	struct snd_pcm_runtime *runtime = substream->runtime;
	96	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	97
	98	iprtd->size = params_buffer_bytes(params);
	99	iprtd->periods = params_periods(params);
b4e82b5b	100	iprtd->period = params_period_bytes(params) ;
8380222e	101	iprtd->offset = 0;
b4e82b5b	102	iprtd->last_offset = 0;
43a3cec0 SH	103	iprtd->poll_time_ns = 1000000000 / params_rate(params) *
43a3cec0 SH	104	params_period_size(params);
8380222e SH	105	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	106
	107	return 0;
	108	}
	109
	110	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
	111	{
	112	struct snd_pcm_runtime *runtime = substream->runtime;
	113	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	114	struct pt_regs regs;
	115
	116	get_fiq_regs(&regs);
	117	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	118	regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
	119	else
	120	regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
	121
	122	set_fiq_regs(&regs);
	123
	124	return 0;
	125	}
	126
	127	static int fiq_enable;
	128	static int imx_pcm_fiq;
	129
	130	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	131	{
	132	struct snd_pcm_runtime *runtime = substream->runtime;
	133	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	134
	135	switch (cmd) {
	136	case SNDRV_PCM_TRIGGER_START:
	137	case SNDRV_PCM_TRIGGER_RESUME:
	138	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
83926099	139	atomic_set(&iprtd->running, 1);
43a3cec0 SH	140	hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
43a3cec0 SH	141	HRTIMER_MODE_REL);
8380222e SH	142	if (++fiq_enable == 1)
	143	enable_fiq(imx_pcm_fiq);
	144
	145	break;
	146
	147	case SNDRV_PCM_TRIGGER_STOP:
	148	case SNDRV_PCM_TRIGGER_SUSPEND:
	149	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
83926099 SH	150	atomic_set(&iprtd->running, 0);
83926099 SH	151
8380222e SH	152	if (--fiq_enable == 0)
	153	disable_fiq(imx_pcm_fiq);
	154
8380222e SH	155	break;
	156	default:
	157	return -EINVAL;
	158	}
	159
	160	return 0;
	161	}
	162
	163	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	164	{
	165	struct snd_pcm_runtime *runtime = substream->runtime;
	166	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	167
	168	return bytes_to_frames(substream->runtime, iprtd->offset);
	169	}
	170
	171	static struct snd_pcm_hardware snd_imx_hardware = {
	172	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	173	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	174	SNDRV_PCM_INFO_MMAP \|
	175	SNDRV_PCM_INFO_MMAP_VALID \|
	176	SNDRV_PCM_INFO_PAUSE \|
	177	SNDRV_PCM_INFO_RESUME,
	178	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	179	.rate_min = 8000,
	180	.channels_min = 2,
	181	.channels_max = 2,
	182	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	183	.period_bytes_min = 128,
	184	.period_bytes_max = 16 * 1024,
565a79f7	185	.periods_min = 4,
8380222e SH	186	.periods_max = 255,
	187	.fifo_size = 0,
	188	};
	189
	190	static int snd_imx_open(struct snd_pcm_substream *substream)
	191	{
	192	struct snd_pcm_runtime *runtime = substream->runtime;
	193	struct imx_pcm_runtime_data *iprtd;
	194	int ret;
	195
	196	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
50e8ce14 KV	197	if (iprtd == NULL)
50e8ce14 KV	198	return -ENOMEM;
8380222e SH	199	runtime->private_data = iprtd;
8380222e SH	200
43a3cec0 SH	201	iprtd->substream = substream;
43a3cec0 SH	202
83926099	203	atomic_set(&iprtd->running, 0);
43a3cec0 SH	204	hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
43a3cec0 SH	205	iprtd->hrt.function = snd_hrtimer_callback;
8380222e SH	206
	207	ret = snd_pcm_hw_constraint_integer(substream->runtime,
	208	SNDRV_PCM_HW_PARAM_PERIODS);
50e8ce14 KV	209	if (ret < 0) {
50e8ce14 KV	210	kfree(iprtd);
8380222e	211	return ret;
50e8ce14	212	}
8380222e SH	213
	214	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
	215	return 0;
	216	}
	217
	218	static int snd_imx_close(struct snd_pcm_substream *substream)
	219	{
	220	struct snd_pcm_runtime *runtime = substream->runtime;
	221	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	222
43a3cec0 SH	223	hrtimer_cancel(&iprtd->hrt);
43a3cec0 SH	224
8380222e SH	225	kfree(iprtd);
	226
	227	return 0;
	228	}
	229
dbdf6b54 SG	230	static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
	231	struct vm_area_struct *vma)
	232	{
	233	struct snd_pcm_runtime *runtime = substream->runtime;
	234	int ret;
	235
	236	ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
	237	runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
	238
	239	pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
	240	runtime->dma_area,
	241	runtime->dma_addr,
	242	runtime->dma_bytes);
	243	return ret;
	244	}
	245
8380222e SH	246	static struct snd_pcm_ops imx_pcm_ops = {
	247	.open = snd_imx_open,
	248	.close = snd_imx_close,
	249	.ioctl = snd_pcm_lib_ioctl,
	250	.hw_params = snd_imx_pcm_hw_params,
	251	.prepare = snd_imx_pcm_prepare,
	252	.trigger = snd_imx_pcm_trigger,
	253	.pointer = snd_imx_pcm_pointer,
	254	.mmap = snd_imx_pcm_mmap,
	255	};
	256
dbdf6b54 SG	257	static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	258	{
	259	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	260	struct snd_dma_buffer *buf = &substream->dma_buffer;
	261	size_t size = IMX_SSI_DMABUF_SIZE;
	262
	263	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	264	buf->dev.dev = pcm->card->dev;
	265	buf->private_data = NULL;
	266	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	267	&buf->addr, GFP_KERNEL);
	268	if (!buf->area)
	269	return -ENOMEM;
	270	buf->bytes = size;
	271
	272	return 0;
	273	}
	274
	275	static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
	276
	277	static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
	278	{
	279	struct snd_card *card = rtd->card->snd_card;
	280	struct snd_pcm *pcm = rtd->pcm;
	281	int ret = 0;
	282
	283	if (!card->dev->dma_mask)
	284	card->dev->dma_mask = &imx_pcm_dmamask;
	285	if (!card->dev->coherent_dma_mask)
	286	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
	287	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
	288	ret = imx_pcm_preallocate_dma_buffer(pcm,
	289	SNDRV_PCM_STREAM_PLAYBACK);
	290	if (ret)
	291	goto out;
	292	}
	293
	294	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
	295	ret = imx_pcm_preallocate_dma_buffer(pcm,
	296	SNDRV_PCM_STREAM_CAPTURE);
	297	if (ret)
	298	goto out;
	299	}
	300
	301	out:
	302	return ret;
	303	}
	304
f0fba2ad LG	305	static int ssi_irq = 0;
f0fba2ad LG	306
552d1ef6	307	static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
8380222e	308	{
552d1ef6	309	struct snd_pcm *pcm = rtd->pcm;
35dcf586	310	struct snd_pcm_substream *substream;
8380222e SH	311	int ret;
8380222e SH	312
552d1ef6	313	ret = imx_pcm_new(rtd);
8380222e SH	314	if (ret)
	315	return ret;
	316
35dcf586 WS	317	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
35dcf586 WS	318	if (substream) {
8380222e SH	319	struct snd_dma_buffer *buf = &substream->dma_buffer;
	320
	321	imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
	322	}
	323
35dcf586 WS	324	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
35dcf586 WS	325	if (substream) {
8380222e SH	326	struct snd_dma_buffer *buf = &substream->dma_buffer;
	327
	328	imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
	329	}
	330
	331	set_fiq_handler(&imx_ssi_fiq_start,
	332	&imx_ssi_fiq_end - &imx_ssi_fiq_start);
	333
	334	return 0;
	335	}
	336
dbdf6b54 SG	337	static void imx_pcm_free(struct snd_pcm *pcm)
	338	{
	339	struct snd_pcm_substream *substream;
	340	struct snd_dma_buffer *buf;
	341	int stream;
	342
	343	for (stream = 0; stream < 2; stream++) {
	344	substream = pcm->streams[stream].substream;
	345	if (!substream)
	346	continue;
	347
	348	buf = &substream->dma_buffer;
	349	if (!buf->area)
	350	continue;
	351
	352	dma_free_writecombine(pcm->card->dev, buf->bytes,
	353	buf->area, buf->addr);
	354	buf->area = NULL;
	355	}
	356	}
	357
f0fba2ad LG	358	static void imx_pcm_fiq_free(struct snd_pcm *pcm)
	359	{
	360	mxc_set_irq_fiq(ssi_irq, 0);
	361	release_fiq(&fh);
	362	imx_pcm_free(pcm);
	363	}
	364
	365	static struct snd_soc_platform_driver imx_soc_platform_fiq = {
	366	.ops = &imx_pcm_ops,
8380222e	367	.pcm_new = imx_pcm_fiq_new,
f0fba2ad	368	.pcm_free = imx_pcm_fiq_free,
8380222e SH	369	};
8380222e SH	370
9051cba1 MP	371	int imx_pcm_fiq_init(struct platform_device *pdev,
9051cba1 MP	372	struct imx_pcm_fiq_params *params)
8380222e	373	{
f0fba2ad	374	int ret;
8380222e SH	375
	376	ret = claim_fiq(&fh);
	377	if (ret) {
	378	dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
f0fba2ad	379	return ret;
8380222e SH	380	}
8380222e SH	381
9051cba1 MP	382	mxc_set_irq_fiq(params->irq, 1);
9051cba1 MP	383	ssi_irq = params->irq;
8380222e	384
9051cba1	385	imx_pcm_fiq = params->irq;
8380222e	386
9051cba1	387	imx_ssi_fiq_base = (unsigned long)params->base;
8380222e	388
9051cba1 MP	389	params->dma_params_tx->maxburst = 4;
9051cba1 MP	390	params->dma_params_rx->maxburst = 6;
8380222e	391
f0fba2ad LG	392	ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
	393	if (ret)
	394	goto failed_register;
	395
	396	return 0;
	397
	398	failed_register:
	399	mxc_set_irq_fiq(ssi_irq, 0);
	400	release_fiq(&fh);
	401
	402	return ret;
8380222e	403	}
dbdf6b54	404	EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
88e89f55 SG	405
	406	void imx_pcm_fiq_exit(struct platform_device *pdev)
	407	{
	408	snd_soc_unregister_platform(&pdev->dev);
	409	}
dbdf6b54	410	EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
3c1c32d3 MB	411
3c1c32d3 MB	412	MODULE_LICENSE("GPL");