[ALSA] SH7760 ASoC support

source "sound/soc/at91/Kconfig"

source "sound/soc/pxa/Kconfig"

source "sound/soc/s3c24xx/Kconfig"

source "sound/soc/sh/Kconfig"

# Supported codecs

source "sound/soc/codecs/Kconfig"

snd-soc-core-objs := soc-core.o soc-dapm.o

obj-$(CONFIG_SND_SOC)	+= snd-soc-core.o

obj-$(CONFIG_SND_SOC)	+= codecs/ at91/ pxa/ s3c24xx/

obj-$(CONFIG_SND_SOC)	+= codecs/ at91/ pxa/ s3c24xx/ sh/

menu "SoC Audio support for SuperH"

config SND_SOC_PCM_SH7760

	tristate "SoC Audio support for Renesas SH7760"

	depends on CPU_SUBTYPE_SH7760 && SND_SOC

	select SH_DMABRG

	help

	  Enable this option for SH7760 AC97/I2S audio support.

##

## Audio unit modules

##

config SND_SOC_SH4_HAC

	select AC97_BUS

	select SND_SOC_AC97_BUS

	select SND_AC97_CODEC

	tristate

config SND_SOC_SH4_SSI

	tristate

##

## Boards

##

config SND_SH7760_AC97

	tristate "SH7760 AC97 sound support"

	depends on CPU_SUBTYPE_SH7760 && SND_SOC_PCM_SH7760

	select SND_SOC_SH4_HAC

	select SND_SOC_AC97_CODEC

	help

	  This option enables generic sound support for the first

	  AC97 unit of the SH7760.

endmenu

## DMA engines

snd-soc-dma-sh7760-objs	:= dma-sh7760.o

obj-$(CONFIG_SND_SOC_PCM_SH7760)	+= snd-soc-dma-sh7760.o

## audio units found on some SH-4

snd-soc-hac-objs	:= hac.o

snd-soc-ssi-objs	:= ssi.o

obj-$(CONFIG_SND_SOC_SH4_HAC)	+= snd-soc-hac.o

obj-$(CONFIG_SND_SOC_SH4_SSI)	+= snd-soc-ssi.o

## boards

snd-soc-sh7760-ac97-objs	:= sh7760-ac97.o

obj-$(CONFIG_SND_SH7760_AC97)	+= snd-soc-sh7760-ac97.o

/*

 * SH7760 ("camelot") DMABRG audio DMA unit support

 *

 * Copyright (C) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>

 *  licensed under the terms outlined in the file COPYING at the root

 *  of the linux kernel sources.

 *

 * The SH7760 DMABRG provides 4 dma channels (2x rec, 2x play), which

 * trigger an interrupt when one half of the programmed transfer size

 * has been xmitted.

 *

 * FIXME: little-endian only for now

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/dma-mapping.h>

#include <sound/driver.h>

#include <sound/core.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>

#include <asm/dmabrg.h>

/* registers and bits */

#define BRGATXSAR	0x00

#define BRGARXDAR	0x04

#define BRGATXTCR	0x08

#define BRGARXTCR	0x0C

#define BRGACR		0x10

#define BRGATXTCNT	0x14

#define BRGARXTCNT	0x18

#define ACR_RAR		(1 << 18)

#define ACR_RDS		(1 << 17)

#define ACR_RDE		(1 << 16)

#define ACR_TAR		(1 << 2)

#define ACR_TDS		(1 << 1)

#define ACR_TDE		(1 << 0)

/* receiver/transmitter data alignment */

#define ACR_RAM_NONE	(0 << 24)

#define ACR_RAM_4BYTE	(1 << 24)

#define ACR_RAM_2WORD	(2 << 24)

#define ACR_TAM_NONE	(0 << 8)

#define ACR_TAM_4BYTE	(1 << 8)

#define ACR_TAM_2WORD	(2 << 8)

struct camelot_pcm {

	unsigned long mmio;  /* DMABRG audio channel control reg MMIO */

	unsigned int txid;    /* ID of first DMABRG IRQ for this unit */

	struct snd_pcm_substream *tx_ss;

	unsigned long tx_period_size;

	unsigned int  tx_period;

	struct snd_pcm_substream *rx_ss;

	unsigned long rx_period_size;

	unsigned int  rx_period;

} cam_pcm_data[2] = {

	{

		.mmio	=	0xFE3C0040,

		.txid	=	DMABRGIRQ_A0TXF,

	},

	{

		.mmio	=	0xFE3C0060,

		.txid	=	DMABRGIRQ_A1TXF,

	},

};

#define BRGREG(x)	(*(unsigned long *)(cam->mmio + (x)))

/*

 * set a minimum of 16kb per period, to avoid interrupt-"storm" and

 * resulting skipping. In general, the bigger the minimum size, the

 * better for overall system performance. (The SH7760 is a puny CPU

 * with a slow SDRAM interface and poor internal bus bandwidth,

 * *especially* when the LCDC is active).  The minimum for the DMAC

 * is 8 bytes; 16kbytes are enough to get skip-free playback of a

 * 44kHz/16bit/stereo MP3 on a lightly loaded system, and maintain

 * reasonable responsiveness in MPlayer.

 */

#define DMABRG_PERIOD_MIN		16 * 1024

#define DMABRG_PERIOD_MAX		0x03fffffc

#define DMABRG_PREALLOC_BUFFER		32 * 1024

#define DMABRG_PREALLOC_BUFFER_MAX	32 * 1024

/* support everything the SSI supports */

#define DMABRG_RATES	\

	SNDRV_PCM_RATE_8000_192000

#define DMABRG_FMTS	\

	(SNDRV_PCM_FMTBIT_S8      | SNDRV_PCM_FMTBIT_U8      |	\

	 SNDRV_PCM_FMTBIT_S16_LE  | SNDRV_PCM_FMTBIT_U16_LE  |	\

	 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE |	\

	 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_U24_3LE |	\

	 SNDRV_PCM_FMTBIT_S32_LE  | SNDRV_PCM_FMTBIT_U32_LE)

static struct snd_pcm_hardware camelot_pcm_hardware = {

	.info = (SNDRV_PCM_INFO_MMAP |

		SNDRV_PCM_INFO_INTERLEAVED |

		SNDRV_PCM_INFO_BLOCK_TRANSFER |

		SNDRV_PCM_INFO_MMAP_VALID),

	.formats =	DMABRG_FMTS,

	.rates =	DMABRG_RATES,

	.rate_min =		8000,

	.rate_max =		192000,

	.channels_min =		2,

	.channels_max =		8,		/* max of the SSI */

	.buffer_bytes_max =	DMABRG_PERIOD_MAX,

	.period_bytes_min =	DMABRG_PERIOD_MIN,

	.period_bytes_max =	DMABRG_PERIOD_MAX / 2,

	.periods_min =		2,

	.periods_max =		2,

	.fifo_size =		128,

};

static void camelot_txdma(void *data)

{

	struct camelot_pcm *cam = data;

	cam->tx_period ^= 1;

	snd_pcm_period_elapsed(cam->tx_ss);

}

static void camelot_rxdma(void *data)

{

	struct camelot_pcm *cam = data;

	cam->rx_period ^= 1;

	snd_pcm_period_elapsed(cam->rx_ss);

}

static int camelot_pcm_open(struct snd_pcm_substream *substream)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct camelot_pcm *cam = &cam_pcm_data[rtd->dai->cpu_dai->id];

	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;

	int ret, dmairq;

	snd_soc_set_runtime_hwparams(substream, &camelot_pcm_hardware);

	/* DMABRG buffer half/full events */

	dmairq = (recv) ? cam->txid + 2 : cam->txid;

	if (recv) {

		cam->rx_ss = substream;

		ret = dmabrg_request_irq(dmairq, camelot_rxdma, cam);

		if (unlikely(ret)) {

			pr_debug("audio unit %d irqs already taken!\n",

			     rtd->dai->cpu_dai->id);

			return -EBUSY;

		}

		(void)dmabrg_request_irq(dmairq + 1,camelot_rxdma, cam);

	} else {

		cam->tx_ss = substream;

		ret = dmabrg_request_irq(dmairq, camelot_txdma, cam);

		if (unlikely(ret)) {

			pr_debug("audio unit %d irqs already taken!\n",

			     rtd->dai->cpu_dai->id);

			return -EBUSY;

		}

		(void)dmabrg_request_irq(dmairq + 1, camelot_txdma, cam);

	}

	return 0;

}

static int camelot_pcm_close(struct snd_pcm_substream *substream)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct camelot_pcm *cam = &cam_pcm_data[rtd->dai->cpu_dai->id];

	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;

	int dmairq;

	dmairq = (recv) ? cam->txid + 2 : cam->txid;

	if (recv)

		cam->rx_ss = NULL;

	else

		cam->tx_ss = NULL;

	dmabrg_free_irq(dmairq + 1);

	dmabrg_free_irq(dmairq);

	return 0;

}

static int camelot_hw_params(struct snd_pcm_substream *substream,

			     struct snd_pcm_hw_params *hw_params)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct camelot_pcm *cam = &cam_pcm_data[rtd->dai->cpu_dai->id];

	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;

	int ret;

	ret = snd_pcm_lib_malloc_pages(substream,

				       params_buffer_bytes(hw_params));

	if (ret < 0)

		return ret;

	if (recv) {

		cam->rx_period_size = params_period_bytes(hw_params);

		cam->rx_period = 0;

	} else {

		cam->tx_period_size = params_period_bytes(hw_params);

		cam->tx_period = 0;

	}

	return 0;

}

static int camelot_hw_free(struct snd_pcm_substream *substream)

{

	return snd_pcm_lib_free_pages(substream);

}

static int camelot_prepare(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct camelot_pcm *cam = &cam_pcm_data[rtd->dai->cpu_dai->id];

	pr_debug("PCM data: addr 0x%08ulx len %d\n",

		 (u32)runtime->dma_addr, runtime->dma_bytes);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {

		BRGREG(BRGATXSAR) = (unsigned long)runtime->dma_area;

		BRGREG(BRGATXTCR) = runtime->dma_bytes;

	} else {

		BRGREG(BRGARXDAR) = (unsigned long)runtime->dma_area;

		BRGREG(BRGARXTCR) = runtime->dma_bytes;

	}

	return 0;

}

static inline void dmabrg_play_dma_start(struct camelot_pcm *cam)

{

	unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);

	/* start DMABRG engine: XFER start, auto-addr-reload */

	BRGREG(BRGACR) = acr | ACR_TDE | ACR_TAR | ACR_TAM_2WORD;

}

static inline void dmabrg_play_dma_stop(struct camelot_pcm *cam)

{

	unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);

	/* forcibly terminate data transmission */

	BRGREG(BRGACR) = acr | ACR_TDS;

}

static inline void dmabrg_rec_dma_start(struct camelot_pcm *cam)

{

	unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);

	/* start DMABRG engine: recv start, auto-reload */

	BRGREG(BRGACR) = acr | ACR_RDE | ACR_RAR | ACR_RAM_2WORD;

}

static inline void dmabrg_rec_dma_stop(struct camelot_pcm *cam)

{

	unsigned long acr = BRGREG(BRGACR) & ~(ACR_TDS | ACR_RDS);

	/* forcibly terminate data receiver */

	BRGREG(BRGACR) = acr | ACR_RDS;

}

static int camelot_trigger(struct snd_pcm_substream *substream, int cmd)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct camelot_pcm *cam = &cam_pcm_data[rtd->dai->cpu_dai->id];

	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;

	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

		if (recv)

			dmabrg_rec_dma_start(cam);

		else

			dmabrg_play_dma_start(cam);

		break;

	case SNDRV_PCM_TRIGGER_STOP:

		if (recv)

			dmabrg_rec_dma_stop(cam);

		else

			dmabrg_play_dma_stop(cam);

		break;

	default:

		return -EINVAL;

	}

	return 0;

}

static snd_pcm_uframes_t camelot_pos(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct camelot_pcm *cam = &cam_pcm_data[rtd->dai->cpu_dai->id];

	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;

	unsigned long pos;

	/* cannot use the DMABRG pointer register: under load, by the

	 * time ALSA comes around to read the register, it is already

	 * far ahead (or worse, already done with the fragment) of the

	 * position at the time the IRQ was triggered, which results in

	 * fast-playback sound in my test application (ScummVM)

	 */

	if (recv)

		pos = cam->rx_period ? cam->rx_period_size : 0;

	else

		pos = cam->tx_period ? cam->tx_period_size : 0;

	return bytes_to_frames(runtime, pos);

}

static struct snd_pcm_ops camelot_pcm_ops = {

	.open		= camelot_pcm_open,

	.close		= camelot_pcm_close,

	.ioctl		= snd_pcm_lib_ioctl,

	.hw_params	= camelot_hw_params,

	.hw_free	= camelot_hw_free,

	.prepare	= camelot_prepare,

	.trigger	= camelot_trigger,

	.pointer	= camelot_pos,

};

static void camelot_pcm_free(struct snd_pcm *pcm)

{

	snd_pcm_lib_preallocate_free_for_all(pcm);

}

static int camelot_pcm_new(struct snd_card *card,

			   struct snd_soc_codec_dai *dai,

			   struct snd_pcm *pcm)

{

	/* dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel

	 * in MMAP mode (i.e. aplay -M)

	 */

	snd_pcm_lib_preallocate_pages_for_all(pcm,

		SNDRV_DMA_TYPE_CONTINUOUS,

		snd_dma_continuous_data(GFP_KERNEL),

		DMABRG_PREALLOC_BUFFER,	DMABRG_PREALLOC_BUFFER_MAX);

	return 0;

}

struct snd_soc_platform sh7760_soc_platform = {

	.name		= "sh7760-pcm",

	.pcm_ops 	= &camelot_pcm_ops,

	.pcm_new	= camelot_pcm_new,

	.pcm_free	= camelot_pcm_free,

};

EXPORT_SYMBOL_GPL(sh7760_soc_platform);

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("SH7760 Audio DMA (DMABRG) driver");

MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");