[mirror_ubuntu-bionic-kernel.git] / sound / soc / blackfin / bf5xx-ac97-pcm.c

/*
 * File:         sound/soc/blackfin/bf5xx-ac97-pcm.c
 * Author:       Cliff Cai <Cliff.Cai@analog.com>
 *
 * Created:      Tue June 06 2008
 * Description:  DMA Driver for AC97 sound chip
 *
 * Modified:
 *               Copyright 2008 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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.
 *
 * 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, see the file COPYING, or 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/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>

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

#include <asm/dma.h>

#include "bf5xx-ac97-pcm.h"
#include "bf5xx-ac97.h"
#include "bf5xx-sport.h"

static unsigned int ac97_chan_mask[] = {
	SP_FL, /* Mono */
	SP_STEREO, /* Stereo */
	SP_2DOT1, /* 2.1*/
	SP_QUAD,/*Quadraquic*/
	SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */
	SP_5DOT1, /* 5.1 */
};

#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
	 snd_pcm_uframes_t count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
		sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos *
		runtime->channels, count, chan_mask);
		sport->tx_pos += runtime->period_size;
		if (sport->tx_pos >= runtime->buffer_size)
			sport->tx_pos %= runtime->buffer_size;
		sport->tx_delay_pos = sport->tx_pos;
	} else {
		bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
		sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos *
		runtime->channels, count);
		sport->rx_pos += runtime->period_size;
		if (sport->rx_pos >= runtime->buffer_size)
			sport->rx_pos %= runtime->buffer_size;
	}
}
#endif

static void bf5xx_dma_irq(void *data)
{
	struct snd_pcm_substream *pcm = data;
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	struct snd_pcm_runtime *runtime = pcm->runtime;
	struct sport_device *sport = runtime->private_data;
	bf5xx_mmap_copy(pcm, runtime->period_size);
	if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		if (sport->once == 0) {
			snd_pcm_period_elapsed(pcm);
			bf5xx_mmap_copy(pcm, runtime->period_size);
			sport->once = 1;
		}
	}
#endif
	snd_pcm_period_elapsed(pcm);
}

/* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
 * The total rx/tx buffer is for ac97 frame to hold all pcm data
 * is  0x20000 * sizeof(struct ac97_frame) / 4.
 */
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_INTERLEAVED |
				   SNDRV_PCM_INFO_MMAP |
				   SNDRV_PCM_INFO_MMAP_VALID |
				   SNDRV_PCM_INFO_BLOCK_TRANSFER,
#else
static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_BLOCK_TRANSFER,
#endif
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 0x10000,
	.periods_min		= 1,
	.periods_max		= PAGE_SIZE/32,
	.buffer_bytes_max	= 0x20000, /* 128 kbytes */
	.fifo_size		= 16,
};

static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	size_t size = bf5xx_pcm_hardware.buffer_bytes_max
			* sizeof(struct ac97_frame) / 4;

	snd_pcm_lib_malloc_pages(substream, size);

	return 0;
}

static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		sport->once = 0;
		if (runtime->dma_area)
			memset(runtime->dma_area, 0, runtime->buffer_size);
		memset(sport->tx_dma_buf, 0, runtime->buffer_size *
			sizeof(struct ac97_frame));
	} else
		memset(sport->rx_dma_buf, 0, runtime->buffer_size *
			sizeof(struct ac97_frame));
#endif
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;

	/* An intermediate buffer is introduced for implementing mmap for
	 * SPORT working in TMD mode(include AC97).
	 */
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
			runtime->period_size * sizeof(struct ac97_frame));
	} else {
		sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
			runtime->period_size * sizeof(struct ac97_frame));
	}
#else
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
			runtime->period_size * sizeof(struct ac97_frame));
	} else {
		sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
			runtime->period_size * sizeof(struct ac97_frame));
	}
#endif
	return 0;
}

static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	int ret = 0;

	pr_debug("%s enter\n", __func__);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			bf5xx_mmap_copy(substream, runtime->period_size);
			sport->tx_delay_pos = 0;
			sport_tx_start(sport);
		} else
			sport_rx_start(sport);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
			sport->tx_pos = 0;
#endif
			sport_tx_stop(sport);
		} else {
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
			sport->rx_pos = 0;
#endif
			sport_rx_stop(sport);
		}
		break;
	default:
		ret = -EINVAL;
	}
	return ret;
}

static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	unsigned int curr;

#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		curr = sport->tx_delay_pos;
	else
		curr = sport->rx_pos;
#else

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
	else
		curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);

#endif
	return curr;
}

static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret;

	pr_debug("%s enter\n", __func__);
	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);

	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto out;

	if (sport_handle != NULL)
		runtime->private_data = sport_handle;
	else {
		pr_err("sport_handle is NULL\n");
		return -1;
	}
	return 0;

 out:
	return ret;
}

static int bf5xx_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;

	pr_debug("%s enter\n", __func__);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		sport->once = 0;
		memset(sport->tx_dma_buf, 0, runtime->buffer_size *
			sizeof(struct ac97_frame));
	} else
		memset(sport->rx_dma_buf, 0, runtime->buffer_size *
			sizeof(struct ac97_frame));

	return 0;
}

#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	size_t size = vma->vm_end - vma->vm_start;
	vma->vm_start = (unsigned long)runtime->dma_area;
	vma->vm_end = vma->vm_start + size;
	vma->vm_flags |=  VM_SHARED;
	return 0 ;
}
#else
static	int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
		    snd_pcm_uframes_t pos,
		    void __user *buf, snd_pcm_uframes_t count)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	pr_debug("%s copy pos:0x%lx count:0x%lx\n",
			substream->stream ? "Capture" : "Playback", pos, count);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
			(__u16 *)buf, count, chan_mask);
	else
		bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
			(__u16 *)buf, count);
	return 0;
}
#endif

struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
	.open		= bf5xx_pcm_open,
	.close		= bf5xx_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= bf5xx_pcm_hw_params,
	.hw_free	= bf5xx_pcm_hw_free,
	.prepare	= bf5xx_pcm_prepare,
	.trigger	= bf5xx_pcm_trigger,
	.pointer	= bf5xx_pcm_pointer,
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	.mmap		= bf5xx_pcm_mmap,
#else
	.copy		= bf5xx_pcm_copy,
#endif
};

static int bf5xx_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 = bf5xx_pcm_hardware.buffer_bytes_max
			* sizeof(struct ac97_frame) / 4;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_coherent(pcm->card->dev, size,
			&buf->addr, GFP_KERNEL);
	if (!buf->area) {
		pr_err("Failed to allocate dma memory\n");
		pr_err("Please increase uncached DMA memory region\n");
		return -ENOMEM;
	}
	buf->bytes = size;

	pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
			buf->area, buf->bytes);

	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		sport_handle->tx_buf = buf->area;
	else
		sport_handle->rx_buf = buf->area;

/*
 * Need to allocate local buffer when enable
 * MMAP for SPORT working in TMD mode (include AC97).
 */
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		if (!sport_handle->tx_dma_buf) {
			sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
				size, &sport_handle->tx_dma_phy, GFP_KERNEL);
			if (!sport_handle->tx_dma_buf) {
				pr_err("Failed to allocate memory for tx dma \
					buf - Please increase uncached DMA \
					memory region\n");
				return -ENOMEM;
			} else
				memset(sport_handle->tx_dma_buf, 0, size);
		} else
			memset(sport_handle->tx_dma_buf, 0, size);
	} else {
		if (!sport_handle->rx_dma_buf) {
			sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
				size, &sport_handle->rx_dma_phy, GFP_KERNEL);
			if (!sport_handle->rx_dma_buf) {
				pr_err("Failed to allocate memory for rx dma \
					buf - Please increase uncached DMA \
					memory region\n");
				return -ENOMEM;
			} else
				memset(sport_handle->rx_dma_buf, 0, size);
		} else
			memset(sport_handle->rx_dma_buf, 0, size);
	}
#endif
	return 0;
}

static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
		sizeof(struct ac97_frame) / 4;
#endif
	for (stream = 0; stream < 2; stream++) {
		substream = pcm->streams[stream].substream;
		if (!substream)
			continue;

		buf = &substream->dma_buffer;
		if (!buf->area)
			continue;
		dma_free_coherent(NULL, buf->bytes, buf->area, 0);
		buf->area = NULL;
#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		if (sport_handle->tx_dma_buf)
			dma_free_coherent(NULL, size, \
				sport_handle->tx_dma_buf, 0);
		sport_handle->tx_dma_buf = NULL;
	} else {

		if (sport_handle->rx_dma_buf)
			dma_free_coherent(NULL, size, \
				sport_handle->rx_dma_buf, 0);
		sport_handle->rx_dma_buf = NULL;
	}
#endif
	}
	if (sport_handle)
		sport_done(sport_handle);
}

static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;

int bf5xx_pcm_ac97_new(struct snd_card *card, struct snd_soc_dai *dai,
	struct snd_pcm *pcm)
{
	int ret = 0;

	pr_debug("%s enter\n", __func__);
	if (!card->dev->dma_mask)
		card->dev->dma_mask = &bf5xx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_32BIT_MASK;

	if (dai->playback.channels_min) {
		ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->capture.channels_min) {
		ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}
 out:
	return ret;
}

struct snd_soc_platform bf5xx_ac97_soc_platform = {
	.name		= "bf5xx-audio",
	.pcm_ops 	= &bf5xx_pcm_ac97_ops,
	.pcm_new	= bf5xx_pcm_ac97_new,
	.pcm_free	= bf5xx_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(bf5xx_ac97_soc_platform);

MODULE_AUTHOR("Cliff Cai");
MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
aff0510c CC	1	/*
	2	* File: sound/soc/blackfin/bf5xx-ac97-pcm.c
	3	* Author: Cliff Cai <Cliff.Cai@analog.com>
	4	*
	5	* Created: Tue June 06 2008
	6	* Description: DMA Driver for AC97 sound chip
	7	*
	8	* Modified:
	9	* Copyright 2008 Analog Devices Inc.
	10	*
	11	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License as published by
	15	* the Free Software Foundation; either version 2 of the License, or
	16	* (at your option) any later version.
	17	*
	18	* This program is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	* GNU General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU General Public License
	24	* along with this program; if not, see the file COPYING, or write
	25	* to the Free Software Foundation, Inc.,
	26	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/platform_device.h>
	32	#include <linux/slab.h>
	33	#include <linux/dma-mapping.h>
	34
	35	#include <sound/core.h>
	36	#include <sound/pcm.h>
	37	#include <sound/pcm_params.h>
	38	#include <sound/soc.h>
	39
	40	#include <asm/dma.h>
	41
	42	#include "bf5xx-ac97-pcm.h"
	43	#include "bf5xx-ac97.h"
	44	#include "bf5xx-sport.h"
	45
67f854b9 CC	46	static unsigned int ac97_chan_mask[] = {
	47	SP_FL, /* Mono */
	48	SP_STEREO, /* Stereo */
	49	SP_2DOT1, /* 2.1*/
	50	SP_QUAD,/Quadraquic/
	51	SP_FL \| SP_FR \| SP_FC \| SP_SL \| SP_SR,/5 channels /
	52	SP_5DOT1, /* 5.1 */
	53	};
	54
	55	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	56	static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
	57	snd_pcm_uframes_t count)
	58	{
	59	struct snd_pcm_runtime *runtime = substream->runtime;
	60	struct sport_device *sport = runtime->private_data;
67f854b9	61	unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
aff0510c	62	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
67f854b9 CC	63	bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
	64	sport->tx_pos, (__u16 )runtime->dma_area + sport->tx_pos
	65	runtime->channels, count, chan_mask);
aff0510c CC	66	sport->tx_pos += runtime->period_size;
	67	if (sport->tx_pos >= runtime->buffer_size)
	68	sport->tx_pos %= runtime->buffer_size;
6b58a821	69	sport->tx_delay_pos = sport->tx_pos;
aff0510c	70	} else {
67f854b9 CC	71	bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
	72	sport->rx_pos, (__u16 )runtime->dma_area + sport->rx_pos
	73	runtime->channels, count);
aff0510c CC	74	sport->rx_pos += runtime->period_size;
	75	if (sport->rx_pos >= runtime->buffer_size)
	76	sport->rx_pos %= runtime->buffer_size;
	77	}
	78	}
	79	#endif
	80
	81	static void bf5xx_dma_irq(void *data)
	82	{
	83	struct snd_pcm_substream *pcm = data;
67f854b9	84	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c	85	struct snd_pcm_runtime *runtime = pcm->runtime;
6b58a821	86	struct sport_device *sport = runtime->private_data;
aff0510c	87	bf5xx_mmap_copy(pcm, runtime->period_size);
6b58a821 CC	88	if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	89	if (sport->once == 0) {
	90	snd_pcm_period_elapsed(pcm);
	91	bf5xx_mmap_copy(pcm, runtime->period_size);
	92	sport->once = 1;
	93	}
	94	}
aff0510c CC	95	#endif
	96	snd_pcm_period_elapsed(pcm);
	97	}
	98
	99	/* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
	100	* The total rx/tx buffer is for ac97 frame to hold all pcm data
	101	* is 0x20000 * sizeof(struct ac97_frame) / 4.
	102	*/
67f854b9	103	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	104	static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	105	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	106	SNDRV_PCM_INFO_MMAP \|
	107	SNDRV_PCM_INFO_MMAP_VALID \|
	108	SNDRV_PCM_INFO_BLOCK_TRANSFER,
	109	#else
	110	static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
	111	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	112	SNDRV_PCM_INFO_BLOCK_TRANSFER,
	113	#endif
	114	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	115	.period_bytes_min = 32,
	116	.period_bytes_max = 0x10000,
	117	.periods_min = 1,
	118	.periods_max = PAGE_SIZE/32,
	119	.buffer_bytes_max = 0x20000, /* 128 kbytes */
	120	.fifo_size = 16,
	121	};
	122
	123	static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
	124	struct snd_pcm_hw_params *params)
	125	{
	126	size_t size = bf5xx_pcm_hardware.buffer_bytes_max
	127	* sizeof(struct ac97_frame) / 4;
	128
	129	snd_pcm_lib_malloc_pages(substream, size);
	130
	131	return 0;
	132	}
	133
	134	static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
	135	{
67f854b9	136	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
6b58a821	137	struct snd_pcm_runtime *runtime = substream->runtime;
67f854b9	138	struct sport_device *sport = runtime->private_data;
6b58a821	139
67f854b9 CC	140	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	141	sport->once = 0;
	142	if (runtime->dma_area)
	143	memset(runtime->dma_area, 0, runtime->buffer_size);
	144	memset(sport->tx_dma_buf, 0, runtime->buffer_size *
	145	sizeof(struct ac97_frame));
	146	} else
	147	memset(sport->rx_dma_buf, 0, runtime->buffer_size *
	148	sizeof(struct ac97_frame));
	149	#endif
aff0510c CC	150	snd_pcm_lib_free_pages(substream);
	151	return 0;
	152	}
	153
	154	static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
	155	{
	156	struct snd_pcm_runtime *runtime = substream->runtime;
	157	struct sport_device *sport = runtime->private_data;
	158
	159	/* An intermediate buffer is introduced for implementing mmap for
	160	* SPORT working in TMD mode(include AC97).
	161	*/
67f854b9	162	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c	163	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
aff0510c CC	164	sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
	165	sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
	166	runtime->period_size * sizeof(struct ac97_frame));
	167	} else {
aff0510c CC	168	sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
	169	sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
	170	runtime->period_size * sizeof(struct ac97_frame));
	171	}
	172	#else
	173	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	174	sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
	175	sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
	176	runtime->period_size * sizeof(struct ac97_frame));
	177	} else {
	178	sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
	179	sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
	180	runtime->period_size * sizeof(struct ac97_frame));
	181	}
	182	#endif
	183	return 0;
	184	}
	185
	186	static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	187	{
	188	struct snd_pcm_runtime *runtime = substream->runtime;
	189	struct sport_device *sport = runtime->private_data;
	190	int ret = 0;
	191
	192	pr_debug("%s enter\n", __func__);
	193	switch (cmd) {
	194	case SNDRV_PCM_TRIGGER_START:
6b58a821 CC	195	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
6b58a821 CC	196	bf5xx_mmap_copy(substream, runtime->period_size);
6b58a821	197	sport->tx_delay_pos = 0;
aff0510c	198	sport_tx_start(sport);
67f854b9	199	} else
aff0510c CC	200	sport_rx_start(sport);
	201	break;
	202	case SNDRV_PCM_TRIGGER_STOP:
	203	case SNDRV_PCM_TRIGGER_SUSPEND:
	204	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	205	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
67f854b9	206	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	207	sport->tx_pos = 0;
	208	#endif
	209	sport_tx_stop(sport);
	210	} else {
67f854b9	211	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	212	sport->rx_pos = 0;
	213	#endif
	214	sport_rx_stop(sport);
	215	}
	216	break;
	217	default:
	218	ret = -EINVAL;
	219	}
	220	return ret;
	221	}
	222
	223	static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
	224	{
	225	struct snd_pcm_runtime *runtime = substream->runtime;
	226	struct sport_device *sport = runtime->private_data;
	227	unsigned int curr;
	228
67f854b9	229	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c	230	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
6b58a821	231	curr = sport->tx_delay_pos;
aff0510c CC	232	else
	233	curr = sport->rx_pos;
	234	#else
	235
	236	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	237	curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
	238	else
	239	curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
	240
	241	#endif
	242	return curr;
	243	}
	244
	245	static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
	246	{
	247	struct snd_pcm_runtime *runtime = substream->runtime;
	248	int ret;
	249
	250	pr_debug("%s enter\n", __func__);
	251	snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
	252
	253	ret = snd_pcm_hw_constraint_integer(runtime,
	254	SNDRV_PCM_HW_PARAM_PERIODS);
	255	if (ret < 0)
	256	goto out;
	257
	258	if (sport_handle != NULL)
	259	runtime->private_data = sport_handle;
	260	else {
	261	pr_err("sport_handle is NULL\n");
	262	return -1;
	263	}
	264	return 0;
	265
	266	out:
	267	return ret;
	268	}
	269
6b58a821 CC	270	static int bf5xx_pcm_close(struct snd_pcm_substream *substream)
	271	{
	272	struct snd_pcm_runtime *runtime = substream->runtime;
	273	struct sport_device *sport = runtime->private_data;
	274
	275	pr_debug("%s enter\n", __func__);
	276	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	277	sport->once = 0;
67f854b9 CC	278	memset(sport->tx_dma_buf, 0, runtime->buffer_size *
67f854b9 CC	279	sizeof(struct ac97_frame));
6b58a821	280	} else
67f854b9 CC	281	memset(sport->rx_dma_buf, 0, runtime->buffer_size *
67f854b9 CC	282	sizeof(struct ac97_frame));
6b58a821 CC	283
	284	return 0;
	285	}
	286
67f854b9	287	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	288	static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
	289	struct vm_area_struct *vma)
	290	{
	291	struct snd_pcm_runtime *runtime = substream->runtime;
	292	size_t size = vma->vm_end - vma->vm_start;
	293	vma->vm_start = (unsigned long)runtime->dma_area;
	294	vma->vm_end = vma->vm_start + size;
	295	vma->vm_flags \|= VM_SHARED;
	296	return 0 ;
	297	}
	298	#else
	299	static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
	300	snd_pcm_uframes_t pos,
	301	void __user *buf, snd_pcm_uframes_t count)
	302	{
	303	struct snd_pcm_runtime *runtime = substream->runtime;
	304
	305	pr_debug("%s copy pos:0x%lx count:0x%lx\n",
	306	substream->stream ? "Capture" : "Playback", pos, count);
	307
	308	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
67f854b9 CC	309	bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
67f854b9 CC	310	(__u16 *)buf, count, chan_mask);
aff0510c	311	else
67f854b9 CC	312	bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
67f854b9 CC	313	(__u16 *)buf, count);
aff0510c CC	314	return 0;
	315	}
	316	#endif
	317
	318	struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
	319	.open = bf5xx_pcm_open,
6b58a821	320	.close = bf5xx_pcm_close,
aff0510c CC	321	.ioctl = snd_pcm_lib_ioctl,
	322	.hw_params = bf5xx_pcm_hw_params,
	323	.hw_free = bf5xx_pcm_hw_free,
	324	.prepare = bf5xx_pcm_prepare,
	325	.trigger = bf5xx_pcm_trigger,
	326	.pointer = bf5xx_pcm_pointer,
67f854b9	327	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	328	.mmap = bf5xx_pcm_mmap,
	329	#else
	330	.copy = bf5xx_pcm_copy,
	331	#endif
	332	};
	333
	334	static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	335	{
	336	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	337	struct snd_dma_buffer *buf = &substream->dma_buffer;
	338	size_t size = bf5xx_pcm_hardware.buffer_bytes_max
	339	* sizeof(struct ac97_frame) / 4;
	340
	341	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	342	buf->dev.dev = pcm->card->dev;
	343	buf->private_data = NULL;
	344	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	345	&buf->addr, GFP_KERNEL);
	346	if (!buf->area) {
	347	pr_err("Failed to allocate dma memory\n");
	348	pr_err("Please increase uncached DMA memory region\n");
	349	return -ENOMEM;
	350	}
	351	buf->bytes = size;
	352
	353	pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
	354	buf->area, buf->bytes);
	355
	356	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
	357	sport_handle->tx_buf = buf->area;
	358	else
	359	sport_handle->rx_buf = buf->area;
	360
	361	/*
	362	* Need to allocate local buffer when enable
	363	* MMAP for SPORT working in TMD mode (include AC97).
	364	*/
67f854b9	365	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	366	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	367	if (!sport_handle->tx_dma_buf) {
	368	sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
	369	size, &sport_handle->tx_dma_phy, GFP_KERNEL);
	370	if (!sport_handle->tx_dma_buf) {
	371	pr_err("Failed to allocate memory for tx dma \
	372	buf - Please increase uncached DMA \
	373	memory region\n");
	374	return -ENOMEM;
	375	} else
	376	memset(sport_handle->tx_dma_buf, 0, size);
	377	} else
	378	memset(sport_handle->tx_dma_buf, 0, size);
	379	} else {
	380	if (!sport_handle->rx_dma_buf) {
	381	sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
	382	size, &sport_handle->rx_dma_phy, GFP_KERNEL);
	383	if (!sport_handle->rx_dma_buf) {
	384	pr_err("Failed to allocate memory for rx dma \
	385	buf - Please increase uncached DMA \
	386	memory region\n");
	387	return -ENOMEM;
	388	} else
	389	memset(sport_handle->rx_dma_buf, 0, size);
	390	} else
	391	memset(sport_handle->rx_dma_buf, 0, size);
	392	}
	393	#endif
	394	return 0;
	395	}
	396
	397	static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
	398	{
	399	struct snd_pcm_substream *substream;
	400	struct snd_dma_buffer *buf;
	401	int stream;
67f854b9	402	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	403	size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
	404	sizeof(struct ac97_frame) / 4;
	405	#endif
	406	for (stream = 0; stream < 2; stream++) {
	407	substream = pcm->streams[stream].substream;
	408	if (!substream)
	409	continue;
	410
	411	buf = &substream->dma_buffer;
	412	if (!buf->area)
	413	continue;
	414	dma_free_coherent(NULL, buf->bytes, buf->area, 0);
	415	buf->area = NULL;
67f854b9	416	#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
aff0510c CC	417	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	418	if (sport_handle->tx_dma_buf)
	419	dma_free_coherent(NULL, size, \
	420	sport_handle->tx_dma_buf, 0);
	421	sport_handle->tx_dma_buf = NULL;
	422	} else {
	423
	424	if (sport_handle->rx_dma_buf)
	425	dma_free_coherent(NULL, size, \
	426	sport_handle->rx_dma_buf, 0);
	427	sport_handle->rx_dma_buf = NULL;
	428	}
	429	#endif
	430	}
	431	if (sport_handle)
	432	sport_done(sport_handle);
	433	}
	434
	435	static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
	436
	437	int bf5xx_pcm_ac97_new(struct snd_card card, struct snd_soc_dai dai,
	438	struct snd_pcm *pcm)
	439	{
	440	int ret = 0;
	441
	442	pr_debug("%s enter\n", __func__);
	443	if (!card->dev->dma_mask)
	444	card->dev->dma_mask = &bf5xx_pcm_dmamask;
	445	if (!card->dev->coherent_dma_mask)
	446	card->dev->coherent_dma_mask = DMA_32BIT_MASK;
	447
	448	if (dai->playback.channels_min) {
	449	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	450	SNDRV_PCM_STREAM_PLAYBACK);
	451	if (ret)
	452	goto out;
	453	}
	454
	455	if (dai->capture.channels_min) {
	456	ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
	457	SNDRV_PCM_STREAM_CAPTURE);
	458	if (ret)
	459	goto out;
	460	}
	461	out:
	462	return ret;
	463	}
	464
	465	struct snd_soc_platform bf5xx_ac97_soc_platform = {
	466	.name = "bf5xx-audio",
	467	.pcm_ops = &bf5xx_pcm_ac97_ops,
	468	.pcm_new = bf5xx_pcm_ac97_new,
	469	.pcm_free = bf5xx_pcm_free_dma_buffers,
	470	};
	471	EXPORT_SYMBOL_GPL(bf5xx_ac97_soc_platform);
	472
	473	MODULE_AUTHOR("Cliff Cai");
	474	MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
	475	MODULE_LICENSE("GPL");