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Commit f09aecd5 authored by Sangbeom Kim's avatar Sangbeom Kim Committed by Mark Brown
Browse files

ASoC: SAMSUNG: Add I2S0 internal dma driver 



I2S in Exynos4 and S5PC110(S5PV210) has a internal dma.
It can be used low power audio mode and 2nd channel transfer.
This patch can support idma.

[Reapplied after dependencies propagated through in 3.1-rc1. --broonie]

Signed-off-by: default avatarSangbeom Kim <sbkim73@samsung.com>
Acked-by: default avatarJassi Brar <jassisinghbrar@gmail.com>
Acked-by: default avatarLiam Girdwood <lrg@ti.com>
Acked-by: default avatarJassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent feb00dce

sound/soc/samsung/Makefile

+2 −0
Original line number Original line Diff line number Diff line 
# S3c24XX Platform Support

# S3c24XX Platform Support

snd-soc-s3c24xx-objs := dma.o

snd-soc-s3c24xx-objs := dma.o

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

snd-soc-s3c24xx-i2s-objs := s3c24xx-i2s.o

snd-soc-s3c24xx-i2s-objs := s3c24xx-i2s.o

snd-soc-s3c2412-i2s-objs := s3c2412-i2s.o

snd-soc-s3c2412-i2s-objs := s3c2412-i2s.o

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

snd-soc-ac97-objs := ac97.o
@@ -16,6 +17,7 @@ obj-$(CONFIG_SND_S3C_I2SV2_SOC) += snd-soc-s3c-i2s-v2.o 
obj-$(CONFIG_SND_SAMSUNG_SPDIF) += snd-soc-samsung-spdif.o

obj-$(CONFIG_SND_SAMSUNG_SPDIF) += snd-soc-samsung-spdif.o

obj-$(CONFIG_SND_SAMSUNG_PCM) += snd-soc-pcm.o

obj-$(CONFIG_SND_SAMSUNG_PCM) += snd-soc-pcm.o

obj-$(CONFIG_SND_SAMSUNG_I2S) += snd-soc-i2s.o

obj-$(CONFIG_SND_SAMSUNG_I2S) += snd-soc-i2s.o

obj-$(CONFIG_SND_SAMSUNG_I2S) += snd-soc-idma.o





# S3C24XX Machine Support

# S3C24XX Machine Support

snd-soc-jive-wm8750-objs := jive_wm8750.o

snd-soc-jive-wm8750-objs := jive_wm8750.o

sound/soc/samsung/idma.c

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Original line number Original line Diff line number Diff line 
/*

 * sound/soc/samsung/idma.c

 *

 * Copyright (c) 2011 Samsung Electronics Co., Ltd.

 *		http://www.samsung.com

 *

 * I2S0's Internal DMA driver

 *

 * 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/interrupt.h>

#include <linux/platform_device.h>

#include <linux/dma-mapping.h>

#include <linux/slab.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>



#include "i2s.h"

#include "idma.h"

#include "dma.h"

#include "i2s-regs.h"



#define ST_RUNNING		(1<<0)

#define ST_OPENED		(1<<1)



static const struct snd_pcm_hardware idma_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 |

		    SNDRV_PCM_FMTBIT_U16_LE |

		    SNDRV_PCM_FMTBIT_S24_LE |

		    SNDRV_PCM_FMTBIT_U24_LE |

		    SNDRV_PCM_FMTBIT_U8 |

		    SNDRV_PCM_FMTBIT_S8,

	.channels_min = 2,

	.channels_max = 2,

	.buffer_bytes_max = MAX_IDMA_BUFFER,

	.period_bytes_min = 128,

	.period_bytes_max = MAX_IDMA_PERIOD,

	.periods_min = 1,

	.periods_max = 2,

};



struct idma_ctrl {

	spinlock_t	lock;

	int		state;

	dma_addr_t	start;

	dma_addr_t	pos;

	dma_addr_t	end;

	dma_addr_t	period;

	dma_addr_t	periodsz;

	void		*token;

	void		(*cb)(void *dt, int bytes_xfer);

};



static struct idma_info {

	spinlock_t	lock;

	void		 __iomem  *regs;

	dma_addr_t	lp_tx_addr;

} idma;



static void idma_getpos(dma_addr_t *src)

{

	*src = idma.lp_tx_addr +

		(readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;

}



static int idma_enqueue(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct idma_ctrl *prtd = substream->runtime->private_data;

	u32 val;



	spin_lock(&prtd->lock);

	prtd->token = (void *) substream;

	spin_unlock(&prtd->lock);



	/* Internal DMA Level0 Interrupt Address */

	val = idma.lp_tx_addr + prtd->periodsz;

	writel(val, idma.regs + I2SLVL0ADDR);



	/* Start address0 of I2S internal DMA operation. */

	val = idma.lp_tx_addr;

	writel(val, idma.regs + I2SSTR0);



	/*

	 * Transfer block size for I2S internal DMA.

	 * Should decide transfer size before start dma operation

	 */

	val = readl(idma.regs + I2SSIZE);

	val &= ~(I2SSIZE_TRNMSK << I2SSIZE_SHIFT);

	val |= (((runtime->dma_bytes >> 2) &

			I2SSIZE_TRNMSK) << I2SSIZE_SHIFT);

	writel(val, idma.regs + I2SSIZE);



	val = readl(idma.regs + I2SAHB);

	val |= AHB_INTENLVL0;

	writel(val, idma.regs + I2SAHB);



	return 0;

}



static void idma_setcallbk(struct snd_pcm_substream *substream,

				void (*cb)(void *, int))

{

	struct idma_ctrl *prtd = substream->runtime->private_data;



	spin_lock(&prtd->lock);

	prtd->cb = cb;

	spin_unlock(&prtd->lock);

}



static void idma_control(int op)

{

	u32 val = readl(idma.regs + I2SAHB);



	spin_lock(&idma.lock);



	switch (op) {

	case LPAM_DMA_START:

		val |= (AHB_INTENLVL0 | AHB_DMAEN);

		break;

	case LPAM_DMA_STOP:

		val &= ~(AHB_INTENLVL0 | AHB_DMAEN);

		break;

	default:

		spin_unlock(&idma.lock);

		return;

	}



	writel(val, idma.regs + I2SAHB);

	spin_unlock(&idma.lock);

}



static void idma_done(void *id, int bytes_xfer)

{

	struct snd_pcm_substream *substream = id;

	struct idma_ctrl *prtd = substream->runtime->private_data;



	if (prtd && (prtd->state & ST_RUNNING))

		snd_pcm_period_elapsed(substream);

}



static int idma_hw_params(struct snd_pcm_substream *substream,

				struct snd_pcm_hw_params *params)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct idma_ctrl *prtd = substream->runtime->private_data;

	u32 mod = readl(idma.regs + I2SMOD);

	u32 ahb = readl(idma.regs + I2SAHB);



	ahb |= (AHB_DMARLD | AHB_INTMASK);

	mod |= MOD_TXS_IDMA;

	writel(ahb, idma.regs + I2SAHB);

	writel(mod, idma.regs + I2SMOD);



	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	runtime->dma_bytes = params_buffer_bytes(params);



	prtd->start = prtd->pos = runtime->dma_addr;

	prtd->period = params_periods(params);

	prtd->periodsz = params_period_bytes(params);

	prtd->end = runtime->dma_addr + runtime->dma_bytes;



	idma_setcallbk(substream, idma_done);



	return 0;

}



static int idma_hw_free(struct snd_pcm_substream *substream)

{

	snd_pcm_set_runtime_buffer(substream, NULL);



	return 0;

}



static int idma_prepare(struct snd_pcm_substream *substream)

{

	struct idma_ctrl *prtd = substream->runtime->private_data;



	prtd->pos = prtd->start;



	/* flush the DMA channel */

	idma_control(LPAM_DMA_STOP);

	idma_enqueue(substream);



	return 0;

}



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

{

	struct idma_ctrl *prtd = substream->runtime->private_data;

	int ret = 0;



	spin_lock(&prtd->lock);



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		prtd->state |= ST_RUNNING;

		idma_control(LPAM_DMA_START);

		break;



	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		prtd->state &= ~ST_RUNNING;

		idma_control(LPAM_DMA_STOP);

		break;



	default:

		ret = -EINVAL;

		break;

	}



	spin_unlock(&prtd->lock);



	return ret;

}



static snd_pcm_uframes_t

	idma_pointer(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct idma_ctrl *prtd = runtime->private_data;

	dma_addr_t src;

	unsigned long res;



	spin_lock(&prtd->lock);



	idma_getpos(&src);

	res = src - prtd->start;



	spin_unlock(&prtd->lock);



	return bytes_to_frames(substream->runtime, res);

}



static int idma_mmap(struct snd_pcm_substream *substream,

	struct vm_area_struct *vma)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	unsigned long size, offset;

	int ret;



	/* From snd_pcm_lib_mmap_iomem */

	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	vma->vm_flags |= VM_IO;

	size = vma->vm_end - vma->vm_start;

	offset = vma->vm_pgoff << PAGE_SHIFT;

	ret = io_remap_pfn_range(vma, vma->vm_start,

			(runtime->dma_addr + offset) >> PAGE_SHIFT,

			size, vma->vm_page_prot);



	return ret;

}



static irqreturn_t iis_irq(int irqno, void *dev_id)

{

	struct idma_ctrl *prtd = (struct idma_ctrl *)dev_id;

	u32 iiscon, iisahb, val, addr;



	iisahb  = readl(idma.regs + I2SAHB);

	iiscon  = readl(idma.regs + I2SCON);



	val = (iisahb & AHB_LVL0INT) ? AHB_CLRLVL0INT : 0;



	if (val) {

		iisahb |= val;

		writel(iisahb, idma.regs + I2SAHB);



		addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;

		addr += prtd->periodsz;

		addr %= (prtd->end - prtd->start);

		addr += idma.lp_tx_addr;



		writel(addr, idma.regs + I2SLVL0ADDR);



		if (prtd->cb)

			prtd->cb(prtd->token, prtd->period);

	}



	return IRQ_HANDLED;

}



static int idma_open(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct idma_ctrl *prtd;

	int ret;



	snd_soc_set_runtime_hwparams(substream, &idma_hardware);



	prtd = kzalloc(sizeof(struct idma_ctrl), GFP_KERNEL);

	if (prtd == NULL)

		return -ENOMEM;



	ret = request_irq(IRQ_I2S0, iis_irq, 0, "i2s", prtd);

	if (ret < 0) {

		pr_err("fail to claim i2s irq , ret = %d\n", ret);

		kfree(prtd);

		return ret;

	}



	spin_lock_init(&prtd->lock);



	runtime->private_data = prtd;



	return 0;

}



static int idma_close(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct idma_ctrl *prtd = runtime->private_data;



	free_irq(IRQ_I2S0, prtd);



	if (!prtd)

		pr_err("idma_close called with prtd == NULL\n");



	kfree(prtd);



	return 0;

}



static struct snd_pcm_ops idma_ops = {

	.open		= idma_open,

	.close		= idma_close,

	.ioctl		= snd_pcm_lib_ioctl,

	.trigger	= idma_trigger,

	.pointer	= idma_pointer,

	.mmap		= idma_mmap,

	.hw_params	= idma_hw_params,

	.hw_free	= idma_hw_free,

	.prepare	= idma_prepare,

};



static void idma_free(struct snd_pcm *pcm)

{

	struct snd_pcm_substream *substream;

	struct snd_dma_buffer *buf;



	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;

	if (!substream)

		return;



	buf = &substream->dma_buffer;

	if (!buf->area)

		return;



	iounmap(buf->area);



	buf->area = NULL;

	buf->addr = 0;

}



static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)

{

	struct snd_pcm_substream *substream = pcm->streams[stream].substream;

	struct snd_dma_buffer *buf = &substream->dma_buffer;



	buf->dev.dev = pcm->card->dev;

	buf->private_data = NULL;



	/* Assign PCM buffer pointers */

	buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;

	buf->addr = idma.lp_tx_addr;

	buf->bytes = idma_hardware.buffer_bytes_max;

	buf->area = (unsigned char *)ioremap(buf->addr, buf->bytes);



	return 0;

}



static u64 idma_mask = DMA_BIT_MASK(32);



static int idma_new(struct snd_soc_pcm_runtime *rtd)

{

	struct snd_card *card = rtd->card->snd_card;

	struct snd_soc_dai *dai = rtd->cpu_dai;

	struct snd_pcm *pcm = rtd->pcm;

	int ret = 0;



	if (!card->dev->dma_mask)

		card->dev->dma_mask = &idma_mask;

	if (!card->dev->coherent_dma_mask)

		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);



	if (dai->driver->playback.channels_min)

		ret = preallocate_idma_buffer(pcm,

				SNDRV_PCM_STREAM_PLAYBACK);



	return ret;

}



void idma_reg_addr_init(void *regs, dma_addr_t addr)

{

	spin_lock_init(&idma.lock);

	idma.regs = regs;

	idma.lp_tx_addr = addr;

}



struct snd_soc_platform_driver asoc_idma_platform = {

	.ops = &idma_ops,

	.pcm_new = idma_new,

	.pcm_free = idma_free,

};



static int __devinit asoc_idma_platform_probe(struct platform_device *pdev)

{

	return snd_soc_register_platform(&pdev->dev, &asoc_idma_platform);

}



static int __devexit asoc_idma_platform_remove(struct platform_device *pdev)

{

	snd_soc_unregister_platform(&pdev->dev);

	return 0;

}



static struct platform_driver asoc_idma_driver = {

	.driver = {

		.name = "samsung-idma",

		.owner = THIS_MODULE,

	},



	.probe = asoc_idma_platform_probe,

	.remove = __devexit_p(asoc_idma_platform_remove),

};



static int __init asoc_idma_init(void)

{

	return platform_driver_register(&asoc_idma_driver);

}

module_init(asoc_idma_init);



static void __exit asoc_idma_exit(void)

{

	platform_driver_unregister(&asoc_idma_driver);

}

module_exit(asoc_idma_exit);



MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");

MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");

MODULE_LICENSE("GPL");

sound/soc/samsung/idma.h

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/*

 * sound/soc/samsung/idma.h

 *

 * Copyright (c) 2011 Samsung Electronics Co., Ltd

 *		http://www.samsung.com

 *

 *  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.

 *

 */



#ifndef __SND_SOC_SAMSUNG_IDMA_H_

#define __SND_SOC_SAMSUNG_IDMA_H_



extern void idma_reg_addr_init(void *regs, dma_addr_t addr);



/* dma_state */

#define LPAM_DMA_STOP	0

#define LPAM_DMA_START	1



#define MAX_IDMA_PERIOD (128 * 1024)

#define MAX_IDMA_BUFFER (160 * 1024)



#endif /* __SND_SOC_SAMSUNG_IDMA_H_ */