ux500_pcm.c

/*
 * Copyright (C) ST-Ericsson SA 2012
 *
 * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
 *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
 *         for ST-Ericsson.
 *
 * License terms:
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include <asm/page.h>

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <linux/platform_data/dma-ste-dma40.h>

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

#include "ux500_msp_i2s.h"
#include "ux500_pcm.h"

#define UX500_PLATFORM_MIN_RATE 8000
#define UX500_PLATFORM_MAX_RATE 48000

#define UX500_PLATFORM_MIN_CHANNELS 1
#define UX500_PLATFORM_MAX_CHANNELS 8

#define UX500_PLATFORM_PERIODS_BYTES_MIN	128
#define UX500_PLATFORM_PERIODS_BYTES_MAX	(64 * PAGE_SIZE)
#define UX500_PLATFORM_PERIODS_MIN		2
#define UX500_PLATFORM_PERIODS_MAX		48
#define UX500_PLATFORM_BUFFER_BYTES_MAX		(2048 * PAGE_SIZE)

static struct snd_pcm_hardware ux500_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_RESUME |
		SNDRV_PCM_INFO_PAUSE,
	.formats = SNDRV_PCM_FMTBIT_S16_LE |
		SNDRV_PCM_FMTBIT_U16_LE |
		SNDRV_PCM_FMTBIT_S16_BE |
		SNDRV_PCM_FMTBIT_U16_BE,
	.rates = SNDRV_PCM_RATE_KNOT,
	.rate_min = UX500_PLATFORM_MIN_RATE,
	.rate_max = UX500_PLATFORM_MAX_RATE,
	.channels_min = UX500_PLATFORM_MIN_CHANNELS,
	.channels_max = UX500_PLATFORM_MAX_CHANNELS,
	.buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
	.period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
	.period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
	.periods_min = UX500_PLATFORM_PERIODS_MIN,
	.periods_max = UX500_PLATFORM_PERIODS_MAX,
};

static void ux500_pcm_dma_hw_free(struct device *dev,
				struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = runtime->dma_buffer_p;

	if (runtime->dma_area == NULL)
		return;

	if (buf != &substream->dma_buffer) {
		dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
				buf->addr);
		kfree(runtime->dma_buffer_p);
	}

	snd_pcm_set_runtime_buffer(substream, NULL);
}

static int ux500_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	struct device *dev = dai->dev;
	int ret;
	struct ux500_msp_dma_params *dma_params;
	u16 per_data_width, mem_data_width;
	struct stedma40_chan_cfg *dma_cfg;

	dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
		snd_pcm_stream_str(substream));

	dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
	snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw);

	mem_data_width = STEDMA40_HALFWORD_WIDTH;

	dma_params = snd_soc_dai_get_dma_data(dai, substream);
	switch (dma_params->data_size) {
	case 32:
		per_data_width = STEDMA40_WORD_WIDTH;
		break;
	case 16:
		per_data_width = STEDMA40_HALFWORD_WIDTH;
		break;
	case 8:
		per_data_width = STEDMA40_BYTE_WIDTH;
		break;
	default:
		per_data_width = STEDMA40_WORD_WIDTH;
		dev_warn(rtd->platform->dev,
			"%s: Unknown data-size (%d)! Assuming 32 bits.\n",
			__func__, dma_params->data_size);
	}

	dma_cfg = dma_params->dma_cfg;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dma_cfg->src_info.data_width = mem_data_width;
		dma_cfg->dst_info.data_width = per_data_width;
	} else {
		dma_cfg->src_info.data_width = per_data_width;
		dma_cfg->dst_info.data_width = mem_data_width;
	}

	ret = snd_dmaengine_pcm_open_request_chan(substream, stedma40_filter,
			dma_cfg);
	if (ret) {
		dev_dbg(dai->dev,
			"%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
			__func__, ret);
		return ret;
	}

	return 0;
}

static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
			struct snd_pcm_hw_params *hw_params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = runtime->dma_buffer_p;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret = 0;
	int size;

	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

	size = params_buffer_bytes(hw_params);

	if (buf) {
		if (buf->bytes >= size)
			goto out;
		ux500_pcm_dma_hw_free(NULL, substream);
	}

	if (substream->dma_buffer.area != NULL &&
		substream->dma_buffer.bytes >= size) {
		buf = &substream->dma_buffer;
	} else {
		buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
		if (!buf)
			goto nomem;

		buf->dev.type = SNDRV_DMA_TYPE_DEV;
		buf->dev.dev = NULL;
		buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
					GFP_KERNEL);
		buf->bytes = size;
		buf->private_data = NULL;

		if (!buf->area)
			goto free;
	}
	snd_pcm_set_runtime_buffer(substream, buf);
	ret = 1;
 out:
	runtime->dma_bytes = size;
	return ret;

 free:
	kfree(buf);
 nomem:
	return -ENOMEM;
}

static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

	ux500_pcm_dma_hw_free(NULL, substream);

	return 0;
}

static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
			struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);

	return dma_mmap_coherent(NULL, vma, runtime->dma_area,
				runtime->dma_addr, runtime->dma_bytes);
}

static struct snd_pcm_ops ux500_pcm_ops = {
	.open		= ux500_pcm_open,
	.close		= snd_dmaengine_pcm_close_release_chan,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= ux500_pcm_hw_params,
	.hw_free	= ux500_pcm_hw_free,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= snd_dmaengine_pcm_pointer_no_residue,
	.mmap		= ux500_pcm_mmap
};

int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_pcm *pcm = rtd->pcm;

	dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
		pcm->id);

	pcm->info_flags = 0;

	return 0;
}

static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
	.ops		= &ux500_pcm_ops,
	.pcm_new        = ux500_pcm_new,
};

int ux500_pcm_register_platform(struct platform_device *pdev)
{
	int ret;

	ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
	if (ret < 0) {
		dev_err(&pdev->dev,
			"%s: ERROR: Failed to register platform '%s' (%d)!\n",
			__func__, pdev->name, ret);
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);

int ux500_pcm_unregister_platform(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);

	return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);