sound: ASoC: Blackfin: DMA Driver for AC97 sound chip (aff0510c) · Commits · e / devices / android_kernel_oneplus_sm8150

sound/soc/blackfin/bf5xx-ac97-pcm.c

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		/*
		* 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"

		#if defined(CONFIG_SND_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;
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		bf5xx_pcm_to_ac97(
		(struct ac97_frame *)sport->tx_dma_buf + sport->tx_pos,
		(__u32 *)runtime->dma_area + sport->tx_pos, count);
		sport->tx_pos += runtime->period_size;
		if (sport->tx_pos >= runtime->buffer_size)
		sport->tx_pos %= runtime->buffer_size;
		} else {
		bf5xx_ac97_to_pcm(
		(struct ac97_frame *)sport->rx_dma_buf + sport->rx_pos,
		(__u32 *)runtime->dma_area + sport->rx_pos, 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_MMAP_SUPPORT)
		struct snd_pcm_runtime *runtime = pcm->runtime;
		bf5xx_mmap_copy(pcm, runtime->period_size);
		#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.
		*/
		#ifdef CONFIG_SND_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)
		{
		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_MMAP_SUPPORT)
		size_t size = bf5xx_pcm_hardware.buffer_bytes_max
		* sizeof(struct ac97_frame) / 4;
		/clean up intermediate buffer/
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		memset(sport->tx_dma_buf, 0, size);
		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 {
		memset(sport->rx_dma_buf, 0, size);
		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)
		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_MMAP_SUPPORT)
		sport->tx_pos = 0;
		#endif
		sport_tx_stop(sport);
		} else {
		#if defined(CONFIG_SND_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_MMAP_SUPPORT)
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		curr = sport->tx_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;
		}

		#ifdef CONFIG_SND_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,
		buf, count);
		else
		bf5xx_ac97_to_pcm(
		(struct ac97_frame *)runtime->dma_area + pos,
		buf, count);
		return 0;
		}
		#endif

		struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
		.open = bf5xx_pcm_open,
		.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,
		#ifdef CONFIG_SND_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_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_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_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");

sound/soc/blackfin/bf5xx-ac97-pcm.h

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		/*
		* linux/sound/arm/bf5xx-ac97-pcm.h -- ALSA PCM interface for the Blackfin
		*
		* Copyright 2007 Analog Device Inc.
		*
		* 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.
		*/

		#ifndef _BF5XX_AC97_PCM_H
		#define _BF5XX_AC97_PCM_H

		struct bf5xx_pcm_dma_params {
		char name; / stream identifier */
		};

		struct bf5xx_gpio {
		u32 sys;
		u32 rx;
		u32 tx;
		u32 clk;
		u32 frm;
		};

		/* platform data */
		extern struct snd_soc_platform bf5xx_ac97_soc_platform;

		#endif