path: root/sound/soc/ux500/ux500_pcm.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * 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/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>

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

#include "ux500_pcm.h"
#include "ux500_msp_dai.h"

static struct snd_pcm_hardware ux500_pcm_hw_playback = {
	.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_PLAYBACK,
	.rate_max = UX500_PLATFORM_MAX_RATE_PLAYBACK,
	.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 struct snd_pcm_hardware ux500_pcm_hw_capture = {
	.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_CAPTURE,
	.rate_max = UX500_PLATFORM_MAX_RATE_CAPTURE,
	.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 const char *stream_str(struct snd_pcm_substream *substream)
{
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return "Playback";
	else
		return "Capture";
}

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);
}

void ux500_pcm_dma_eot_handler(void *data)
{
	struct snd_pcm_substream *substream = data;
	struct snd_pcm_runtime *runtime;
	struct ux500_pcm_private *private;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *dai = rtd->cpu_dai;

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

	if (substream) {
		runtime = substream->runtime;
		private = substream->runtime->private_data;

		if (ux500_msp_dai_i2s_get_underrun_status(private->msp_id)) {
			private->no_of_underruns++;
			pr_debug("%s: Nr of underruns (%d)\n", __func__,
					private->no_of_underruns);
		}

		/* calc the offset in the circular buffer */
		private->offset += frames_to_bytes(runtime,
				runtime->period_size);
		private->offset %= frames_to_bytes(runtime,
				runtime->period_size) * runtime->periods;

		snd_pcm_period_elapsed(substream);
	}
}
EXPORT_SYMBOL(ux500_pcm_dma_eot_handler);

static int ux500_pcm_open(struct snd_pcm_substream *substream)
{
	int stream_id = substream->pstr->stream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct ux500_pcm_private *private;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	int ret;

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

	pr_debug("%s: Set runtime hwparams.\n", __func__);
	if (stream_id == SNDRV_PCM_STREAM_PLAYBACK)
		snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw_playback);
	else
		snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw_capture);

	/* ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0) {
		pr_err("%s: Error: snd_pcm_hw_constraints failed (%d)\n",
			__func__,
			ret);
		return ret;
	}

	pr_debug("%s: Init runtime private data.\n", __func__);
	private = kzalloc(sizeof(struct ux500_pcm_private), GFP_KERNEL);
	if (private == NULL)
		return -ENOMEM;
	private->msp_id = dai->id;
	runtime->private_data = private;

	pr_debug("%s: Set hw-struct for %s.\n", __func__, stream_str(substream));
	runtime->hw = (stream_id == SNDRV_PCM_STREAM_PLAYBACK) ?
		ux500_pcm_hw_playback : ux500_pcm_hw_capture;

	return 0;
}

static int ux500_pcm_close(struct snd_pcm_substream *substream)
{
	struct ux500_pcm_private *private = substream->runtime->private_data;

	pr_debug("%s: Enter\n", __func__);

	kfree(private);

	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;
	int ret = 0;
	int size;

	pr_debug("%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)
{
	pr_debug("%s: Enter\n", __func__);

	ux500_pcm_dma_hw_free(NULL, substream);

	return 0;
}

static int ux500_pcm_prepare(struct snd_pcm_substream *substream)
{
	pr_debug("%s: Enter\n", __func__);
	return 0;
}

static int ux500_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	int ret;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct ux500_pcm_private *private = runtime->private_data;
	int stream_id = substream->pstr->stream;

	pr_debug("%s: Enter\n", __func__);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		pr_debug("%s: START/PAUSE-RELEASE\n", __func__);
		if (runtime->status->state == SNDRV_PCM_STATE_XRUN) {
			pr_debug("XRUN occurred\n");
				return 0;
		}

		private->no_of_underruns = 0;
		private->offset = 0;
		ret = ux500_msp_dai_i2s_configure_sg(runtime->dma_addr,
				runtime->periods,
				frames_to_bytes(runtime, runtime->period_size),
				private->msp_id,
				stream_id);
		if (ret) {
			pr_err("%s: Failed to configure sg-list!\n", __func__);
			return -EINVAL;
		}
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		pr_debug("%s: SNDRV_PCM_TRIGGER_STOP\n", __func__);
		pr_debug("%s: no_of_underruns = %u\n",
			__func__,
			private->no_of_underruns);
		break;

	default:
		pr_err("%s: Invalid command in pcm trigger\n",
			__func__);
		return -EINVAL;
	}

	return 0;
}

static snd_pcm_uframes_t ux500_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct ux500_pcm_private *private = runtime->private_data;

	pr_debug("%s: dma_offset %d frame %ld\n", __func__, private->offset,
			bytes_to_frames(substream->runtime, private->offset));

	return bytes_to_frames(substream->runtime, private->offset);
}

static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
			struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	pr_debug("%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		= ux500_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= ux500_pcm_hw_params,
	.hw_free	= ux500_pcm_hw_free,
	.prepare	= ux500_pcm_prepare,
	.trigger	= ux500_pcm_trigger,
	.pointer	= ux500_pcm_pointer,
	.mmap		= ux500_pcm_mmap
};

int ux500_pcm_new(struct snd_card *card,
		struct snd_soc_dai *dai,
		struct snd_pcm *pcm)
{
	pr_debug("%s: pcm = %d\n", __func__, (int)pcm);

	pcm->info_flags = 0;
	strcpy(pcm->name, "UX500_PCM");

	pr_debug("%s: pcm->name = %s.\n", __func__, pcm->name);

	return 0;
}

static void ux500_pcm_free(struct snd_pcm *pcm)
{
	pr_debug("%s: Enter\n", __func__);
}

static int ux500_pcm_suspend(struct snd_soc_dai *dai)
{
	pr_debug("%s: Enter\n", __func__);

	return 0;
}

static int ux500_pcm_resume(struct snd_soc_dai *dai)
{
	pr_debug("%s: Enter\n", __func__);

	return 0;
}

struct snd_soc_platform_driver ux500_pcm_soc_drv = {
	.ops		= &ux500_pcm_ops,
	.pcm_new        = ux500_pcm_new,
	.pcm_free       = ux500_pcm_free,
	.suspend        = ux500_pcm_suspend,
	.resume         = ux500_pcm_resume,
};
EXPORT_SYMBOL(ux500_pcm_soc_drv);

static int __devexit ux500_pcm_drv_probe(struct platform_device *pdev)
{
	int ret;

	pr_info("%s: Register ux500-pcm SoC platform driver.\n", __func__);
	ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
	if (ret < 0) {
		pr_err("%s: Error: Failed to register "
			"ux500-pcm SoC platform driver (%d)!\n",
			__func__,
			ret);
		return ret;
	}

	return 0;
}

static int __devinit ux500_pcm_drv_remove(struct platform_device *pdev)
{
	pr_info("%s: Unregister ux500-pcm SoC platform driver.\n", __func__);
	snd_soc_unregister_platform(&pdev->dev);

	return 0;
}

static struct platform_driver ux500_pcm_driver = {
	.driver = {
		.name = "ux500-pcm",
		.owner = THIS_MODULE,
	},

	.probe = ux500_pcm_drv_probe,
	.remove = __devexit_p(ux500_pcm_drv_remove),
};

static int __init ux500_pcm_drv_init(void)
{
	pr_debug("%s: Register ux500-pcm platform driver.\n", __func__);

	return platform_driver_register(&ux500_pcm_driver);
}

static void __exit ux500_pcm_drv_exit(void)
{
	pr_debug("%s: Unregister ux500-pcm platform driver.\n", __func__);

	platform_driver_unregister(&ux500_pcm_driver);
}

module_init(ux500_pcm_drv_init);
module_exit(ux500_pcm_drv_exit);

MODULE_LICENSE("GPL");