[mirror_ubuntu-bionic-kernel.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;
	struct hrtimer hrt;
	int poll_time_ns;
	struct snd_pcm_substream *substream;
	atomic_t playing;
	atomic_t capturing;
};

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 pt_regs regs;

	if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
		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;

	snd_pcm_period_elapsed(substream);

	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->periods = params_periods(params);
	iprtd->period = params_period_bytes(params);
	iprtd->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 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:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			atomic_set(&iprtd->playing, 1);
		else
			atomic_set(&iprtd->capturing, 1);
		hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
		      HRTIMER_MODE_REL);
		enable_fiq(imx_pcm_fiq);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			atomic_set(&iprtd->playing, 0);
		else
			atomic_set(&iprtd->capturing, 0);
		if (!atomic_read(&iprtd->playing) &&
				!atomic_read(&iprtd->capturing))
			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,
	.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->playing, 0);
	atomic_set(&iprtd->capturing, 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_wc(substream->pcm->card->dev, vma, runtime->dma_area,
			  runtime->dma_addr, runtime->dma_bytes);

	pr_debug("%s: ret: %d %p %pad 0x%08zx\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_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;
	buf->bytes = size;

	return 0;
}

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;

	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
		ret = imx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			return ret;
	}

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

	return 0;
}

static int ssi_irq;

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_wc(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;
43a3cec0 SH	42	struct hrtimer hrt;
	43	int poll_time_ns;
	44	struct snd_pcm_substream *substream;
fc7dc61d OS	45	atomic_t playing;
fc7dc61d OS	46	atomic_t capturing;
8380222e SH	47	};
8380222e SH	48
43a3cec0	49	static enum hrtimer_restart snd_hrtimer_callback(struct hrtimer *hrt)
b4e82b5b	50	{
43a3cec0 SH	51	struct imx_pcm_runtime_data *iprtd =
	52	container_of(hrt, struct imx_pcm_runtime_data, hrt);
	53	struct snd_pcm_substream *substream = iprtd->substream;
8380222e SH	54	struct pt_regs regs;
8380222e SH	55
fc7dc61d	56	if (!atomic_read(&iprtd->playing) && !atomic_read(&iprtd->capturing))
83926099 SH	57	return HRTIMER_NORESTART;
83926099 SH	58
8380222e SH	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
68f9672b	66	snd_pcm_period_elapsed(substream);
b4e82b5b	67
43a3cec0	68	hrtimer_forward_now(hrt, ns_to_ktime(iprtd->poll_time_ns));
b4e82b5b	69
43a3cec0	70	return HRTIMER_RESTART;
8380222e SH	71	}
	72
	73	static struct fiq_handler fh = {
	74	.name = DRV_NAME,
	75	};
	76
	77	static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
	78	struct snd_pcm_hw_params *params)
	79	{
	80	struct snd_pcm_runtime *runtime = substream->runtime;
	81	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	82
8380222e	83	iprtd->periods = params_periods(params);
68f9672b	84	iprtd->period = params_period_bytes(params);
8380222e	85	iprtd->offset = 0;
43a3cec0 SH	86	iprtd->poll_time_ns = 1000000000 / params_rate(params) *
43a3cec0 SH	87	params_period_size(params);
8380222e SH	88	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	89
	90	return 0;
	91	}
	92
	93	static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
	94	{
	95	struct snd_pcm_runtime *runtime = substream->runtime;
	96	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	97	struct pt_regs regs;
	98
	99	get_fiq_regs(&regs);
	100	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	101	regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
	102	else
	103	regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
	104
	105	set_fiq_regs(&regs);
	106
	107	return 0;
	108	}
	109
8380222e SH	110	static int imx_pcm_fiq;
	111
	112	static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	113	{
	114	struct snd_pcm_runtime *runtime = substream->runtime;
	115	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	116
	117	switch (cmd) {
	118	case SNDRV_PCM_TRIGGER_START:
	119	case SNDRV_PCM_TRIGGER_RESUME:
	120	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
fc7dc61d OS	121	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	122	atomic_set(&iprtd->playing, 1);
	123	else
	124	atomic_set(&iprtd->capturing, 1);
43a3cec0 SH	125	hrtimer_start(&iprtd->hrt, ns_to_ktime(iprtd->poll_time_ns),
43a3cec0 SH	126	HRTIMER_MODE_REL);
fc7dc61d	127	enable_fiq(imx_pcm_fiq);
8380222e SH	128	break;
	129
	130	case SNDRV_PCM_TRIGGER_STOP:
	131	case SNDRV_PCM_TRIGGER_SUSPEND:
	132	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
fc7dc61d OS	133	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	134	atomic_set(&iprtd->playing, 0);
	135	else
	136	atomic_set(&iprtd->capturing, 0);
	137	if (!atomic_read(&iprtd->playing) &&
	138	!atomic_read(&iprtd->capturing))
8380222e	139	disable_fiq(imx_pcm_fiq);
8380222e	140	break;
fc7dc61d	141
8380222e SH	142	default:
	143	return -EINVAL;
	144	}
	145
	146	return 0;
	147	}
	148
	149	static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
	150	{
	151	struct snd_pcm_runtime *runtime = substream->runtime;
	152	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	153
	154	return bytes_to_frames(substream->runtime, iprtd->offset);
	155	}
	156
	157	static struct snd_pcm_hardware snd_imx_hardware = {
	158	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	159	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	160	SNDRV_PCM_INFO_MMAP \|
	161	SNDRV_PCM_INFO_MMAP_VALID \|
	162	SNDRV_PCM_INFO_PAUSE \|
	163	SNDRV_PCM_INFO_RESUME,
	164	.formats = SNDRV_PCM_FMTBIT_S16_LE,
8380222e SH	165	.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
	166	.period_bytes_min = 128,
	167	.period_bytes_max = 16 * 1024,
565a79f7	168	.periods_min = 4,
8380222e SH	169	.periods_max = 255,
	170	.fifo_size = 0,
	171	};
	172
	173	static int snd_imx_open(struct snd_pcm_substream *substream)
	174	{
	175	struct snd_pcm_runtime *runtime = substream->runtime;
	176	struct imx_pcm_runtime_data *iprtd;
	177	int ret;
	178
	179	iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
50e8ce14 KV	180	if (iprtd == NULL)
50e8ce14 KV	181	return -ENOMEM;
8380222e SH	182	runtime->private_data = iprtd;
8380222e SH	183
43a3cec0 SH	184	iprtd->substream = substream;
43a3cec0 SH	185
fc7dc61d OS	186	atomic_set(&iprtd->playing, 0);
fc7dc61d OS	187	atomic_set(&iprtd->capturing, 0);
43a3cec0 SH	188	hrtimer_init(&iprtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
43a3cec0 SH	189	iprtd->hrt.function = snd_hrtimer_callback;
8380222e SH	190
	191	ret = snd_pcm_hw_constraint_integer(substream->runtime,
	192	SNDRV_PCM_HW_PARAM_PERIODS);
50e8ce14 KV	193	if (ret < 0) {
50e8ce14 KV	194	kfree(iprtd);
8380222e	195	return ret;
50e8ce14	196	}
8380222e SH	197
	198	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
	199	return 0;
	200	}
	201
	202	static int snd_imx_close(struct snd_pcm_substream *substream)
	203	{
	204	struct snd_pcm_runtime *runtime = substream->runtime;
	205	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	206
43a3cec0 SH	207	hrtimer_cancel(&iprtd->hrt);
43a3cec0 SH	208
8380222e SH	209	kfree(iprtd);
	210
	211	return 0;
	212	}
	213
dbdf6b54 SG	214	static int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
	215	struct vm_area_struct *vma)
	216	{
	217	struct snd_pcm_runtime *runtime = substream->runtime;
	218	int ret;
	219
f6e45661 LR	220	ret = dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
f6e45661 LR	221	runtime->dma_addr, runtime->dma_bytes);
dbdf6b54	222
e92077c3	223	pr_debug("%s: ret: %d %p %pad 0x%08zx\n", __func__, ret,
dbdf6b54	224	runtime->dma_area,
34e684fa	225	&runtime->dma_addr,
dbdf6b54 SG	226	runtime->dma_bytes);
	227	return ret;
	228	}
	229
8380222e SH	230	static struct snd_pcm_ops imx_pcm_ops = {
	231	.open = snd_imx_open,
	232	.close = snd_imx_close,
	233	.ioctl = snd_pcm_lib_ioctl,
	234	.hw_params = snd_imx_pcm_hw_params,
	235	.prepare = snd_imx_pcm_prepare,
	236	.trigger = snd_imx_pcm_trigger,
	237	.pointer = snd_imx_pcm_pointer,
	238	.mmap = snd_imx_pcm_mmap,
	239	};
	240
dbdf6b54 SG	241	static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	242	{
	243	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	244	struct snd_dma_buffer *buf = &substream->dma_buffer;
	245	size_t size = IMX_SSI_DMABUF_SIZE;
	246
	247	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	248	buf->dev.dev = pcm->card->dev;
	249	buf->private_data = NULL;
f6e45661	250	buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
dbdf6b54 SG	251	if (!buf->area)
	252	return -ENOMEM;
	253	buf->bytes = size;
	254
	255	return 0;
	256	}
	257
dbdf6b54 SG	258	static int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
	259	{
	260	struct snd_card *card = rtd->card->snd_card;
	261	struct snd_pcm *pcm = rtd->pcm;
c9bd5e69 RK	262	int ret;
	263
	264	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	265	if (ret)
	266	return ret;
dbdf6b54	267
dbdf6b54 SG	268	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
	269	ret = imx_pcm_preallocate_dma_buffer(pcm,
	270	SNDRV_PCM_STREAM_PLAYBACK);
	271	if (ret)
ea9f8535	272	return ret;
dbdf6b54 SG	273	}
	274
	275	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
	276	ret = imx_pcm_preallocate_dma_buffer(pcm,
	277	SNDRV_PCM_STREAM_CAPTURE);
	278	if (ret)
ea9f8535	279	return ret;
dbdf6b54 SG	280	}
dbdf6b54 SG	281
ea9f8535	282	return 0;
dbdf6b54 SG	283	}
dbdf6b54 SG	284
cb7d53b4	285	static int ssi_irq;
f0fba2ad	286
552d1ef6	287	static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
8380222e	288	{
552d1ef6	289	struct snd_pcm *pcm = rtd->pcm;
35dcf586	290	struct snd_pcm_substream *substream;
8380222e SH	291	int ret;
8380222e SH	292
552d1ef6	293	ret = imx_pcm_new(rtd);
8380222e SH	294	if (ret)
	295	return ret;
	296
35dcf586 WS	297	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
35dcf586 WS	298	if (substream) {
8380222e SH	299	struct snd_dma_buffer *buf = &substream->dma_buffer;
	300
	301	imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
	302	}
	303
35dcf586 WS	304	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
35dcf586 WS	305	if (substream) {
8380222e SH	306	struct snd_dma_buffer *buf = &substream->dma_buffer;
	307
	308	imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
	309	}
	310
	311	set_fiq_handler(&imx_ssi_fiq_start,
	312	&imx_ssi_fiq_end - &imx_ssi_fiq_start);
	313
	314	return 0;
	315	}
	316
dbdf6b54 SG	317	static void imx_pcm_free(struct snd_pcm *pcm)
	318	{
	319	struct snd_pcm_substream *substream;
	320	struct snd_dma_buffer *buf;
	321	int stream;
	322
	323	for (stream = 0; stream < 2; stream++) {
	324	substream = pcm->streams[stream].substream;
	325	if (!substream)
	326	continue;
	327
	328	buf = &substream->dma_buffer;
	329	if (!buf->area)
	330	continue;
	331
f6e45661	332	dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
dbdf6b54 SG	333	buf->area = NULL;
	334	}
	335	}
	336
f0fba2ad LG	337	static void imx_pcm_fiq_free(struct snd_pcm *pcm)
	338	{
	339	mxc_set_irq_fiq(ssi_irq, 0);
	340	release_fiq(&fh);
	341	imx_pcm_free(pcm);
	342	}
	343
	344	static struct snd_soc_platform_driver imx_soc_platform_fiq = {
	345	.ops = &imx_pcm_ops,
8380222e	346	.pcm_new = imx_pcm_fiq_new,
f0fba2ad	347	.pcm_free = imx_pcm_fiq_free,
8380222e SH	348	};
8380222e SH	349
9051cba1 MP	350	int imx_pcm_fiq_init(struct platform_device *pdev,
9051cba1 MP	351	struct imx_pcm_fiq_params *params)
8380222e	352	{
f0fba2ad	353	int ret;
8380222e SH	354
	355	ret = claim_fiq(&fh);
	356	if (ret) {
	357	dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
f0fba2ad	358	return ret;
8380222e SH	359	}
8380222e SH	360
9051cba1 MP	361	mxc_set_irq_fiq(params->irq, 1);
9051cba1 MP	362	ssi_irq = params->irq;
8380222e	363
9051cba1	364	imx_pcm_fiq = params->irq;
8380222e	365
9051cba1	366	imx_ssi_fiq_base = (unsigned long)params->base;
8380222e	367
9051cba1 MP	368	params->dma_params_tx->maxburst = 4;
9051cba1 MP	369	params->dma_params_rx->maxburst = 6;
8380222e	370
f0fba2ad LG	371	ret = snd_soc_register_platform(&pdev->dev, &imx_soc_platform_fiq);
	372	if (ret)
	373	goto failed_register;
	374
	375	return 0;
	376
	377	failed_register:
	378	mxc_set_irq_fiq(ssi_irq, 0);
	379	release_fiq(&fh);
	380
	381	return ret;
8380222e	382	}
dbdf6b54	383	EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
88e89f55 SG	384
	385	void imx_pcm_fiq_exit(struct platform_device *pdev)
	386	{
	387	snd_soc_unregister_platform(&pdev->dev);
	388	}
dbdf6b54	389	EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);
3c1c32d3 MB	390
3c1c32d3 MB	391	MODULE_LICENSE("GPL");