476 lines
14 KiB
C
476 lines
14 KiB
C
/*
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* File: sound/soc/blackfin/bf5xx-ac97-pcm.c
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* Author: Cliff Cai <Cliff.Cai@analog.com>
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*
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* Created: Tue June 06 2008
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* Description: DMA Driver for AC97 sound chip
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*
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* Modified:
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* Copyright 2008 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/gfp.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <asm/dma.h>
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#include "bf5xx-ac97.h"
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#include "bf5xx-sport.h"
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static unsigned int ac97_chan_mask[] = {
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SP_FL, /* Mono */
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SP_STEREO, /* Stereo */
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SP_2DOT1, /* 2.1*/
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SP_QUAD,/*Quadraquic*/
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SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */
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SP_5DOT1, /* 5.1 */
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};
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
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snd_pcm_uframes_t count)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
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sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos *
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runtime->channels, count, chan_mask);
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sport->tx_pos += runtime->period_size;
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if (sport->tx_pos >= runtime->buffer_size)
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sport->tx_pos %= runtime->buffer_size;
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sport->tx_delay_pos = sport->tx_pos;
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} else {
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bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
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sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos *
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runtime->channels, count);
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sport->rx_pos += runtime->period_size;
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if (sport->rx_pos >= runtime->buffer_size)
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sport->rx_pos %= runtime->buffer_size;
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}
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}
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#endif
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static void bf5xx_dma_irq(void *data)
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{
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struct snd_pcm_substream *pcm = data;
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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struct snd_pcm_runtime *runtime = pcm->runtime;
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struct sport_device *sport = runtime->private_data;
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bf5xx_mmap_copy(pcm, runtime->period_size);
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if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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if (sport->once == 0) {
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snd_pcm_period_elapsed(pcm);
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bf5xx_mmap_copy(pcm, runtime->period_size);
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sport->once = 1;
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}
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}
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#endif
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snd_pcm_period_elapsed(pcm);
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}
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/* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
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* The total rx/tx buffer is for ac97 frame to hold all pcm data
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* is 0x20000 * sizeof(struct ac97_frame) / 4.
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*/
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static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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#endif
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SNDRV_PCM_INFO_BLOCK_TRANSFER,
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.period_bytes_min = 32,
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.period_bytes_max = 0x10000,
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.periods_min = 1,
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.periods_max = PAGE_SIZE/32,
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.buffer_bytes_max = 0x20000, /* 128 kbytes */
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.fifo_size = 16,
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};
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static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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size_t size = bf5xx_pcm_hardware.buffer_bytes_max
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* sizeof(struct ac97_frame) / 4;
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snd_pcm_lib_malloc_pages(substream, size);
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return 0;
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}
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static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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sport->once = 0;
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if (runtime->dma_area)
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memset(runtime->dma_area, 0, runtime->buffer_size);
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memset(sport->tx_dma_buf, 0, runtime->buffer_size *
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sizeof(struct ac97_frame));
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} else
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memset(sport->rx_dma_buf, 0, runtime->buffer_size *
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sizeof(struct ac97_frame));
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#endif
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snd_pcm_lib_free_pages(substream);
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return 0;
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}
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static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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/* An intermediate buffer is introduced for implementing mmap for
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* SPORT working in TMD mode(include AC97).
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*/
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
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sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
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runtime->period_size * sizeof(struct ac97_frame));
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} else {
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sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
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sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
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runtime->period_size * sizeof(struct ac97_frame));
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}
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#else
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
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sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
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runtime->period_size * sizeof(struct ac97_frame));
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} else {
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sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
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sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
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runtime->period_size * sizeof(struct ac97_frame));
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}
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#endif
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return 0;
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}
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static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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int ret = 0;
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pr_debug("%s enter\n", __func__);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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bf5xx_mmap_copy(substream, runtime->period_size);
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sport->tx_delay_pos = 0;
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#endif
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sport_tx_start(sport);
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} else
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sport_rx_start(sport);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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sport->tx_pos = 0;
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#endif
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sport_tx_stop(sport);
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} else {
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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sport->rx_pos = 0;
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#endif
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sport_rx_stop(sport);
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}
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct sport_device *sport = runtime->private_data;
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unsigned int curr;
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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curr = sport->tx_delay_pos;
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else
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curr = sport->rx_pos;
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#else
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
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else
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curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
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#endif
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return curr;
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}
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static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
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struct snd_pcm_runtime *runtime = substream->runtime;
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int ret;
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pr_debug("%s enter\n", __func__);
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snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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goto out;
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if (sport_handle != NULL)
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runtime->private_data = sport_handle;
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else {
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pr_err("sport_handle is NULL\n");
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return -1;
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}
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return 0;
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out:
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return ret;
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}
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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size_t size = vma->vm_end - vma->vm_start;
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vma->vm_start = (unsigned long)runtime->dma_area;
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vma->vm_end = vma->vm_start + size;
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vma->vm_flags |= VM_SHARED;
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return 0 ;
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}
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#else
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static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
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snd_pcm_uframes_t pos,
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void __user *buf, snd_pcm_uframes_t count)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
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pr_debug("%s copy pos:0x%lx count:0x%lx\n",
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substream->stream ? "Capture" : "Playback", pos, count);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
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(__u16 *)buf, count, chan_mask);
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else
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bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
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(__u16 *)buf, count);
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return 0;
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}
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#endif
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static struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
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.open = bf5xx_pcm_open,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = bf5xx_pcm_hw_params,
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.hw_free = bf5xx_pcm_hw_free,
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.prepare = bf5xx_pcm_prepare,
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.trigger = bf5xx_pcm_trigger,
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.pointer = bf5xx_pcm_pointer,
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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.mmap = bf5xx_pcm_mmap,
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#else
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.copy = bf5xx_pcm_copy,
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#endif
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};
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static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_soc_pcm_runtime *rtd = pcm->private_data;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = bf5xx_pcm_hardware.buffer_bytes_max
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* sizeof(struct ac97_frame) / 4;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_coherent(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area) {
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pr_err("Failed to allocate dma memory\n");
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pr_err("Please increase uncached DMA memory region\n");
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return -ENOMEM;
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}
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buf->bytes = size;
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pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
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buf->area, buf->bytes);
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if (stream == SNDRV_PCM_STREAM_PLAYBACK)
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sport_handle->tx_buf = buf->area;
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else
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sport_handle->rx_buf = buf->area;
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/*
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* Need to allocate local buffer when enable
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* MMAP for SPORT working in TMD mode (include AC97).
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*/
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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if (!sport_handle->tx_dma_buf) {
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sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
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size, &sport_handle->tx_dma_phy, GFP_KERNEL);
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if (!sport_handle->tx_dma_buf) {
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pr_err("Failed to allocate memory for tx dma buf - Please increase uncached DMA memory region\n");
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return -ENOMEM;
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} else
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memset(sport_handle->tx_dma_buf, 0, size);
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} else
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memset(sport_handle->tx_dma_buf, 0, size);
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} else {
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if (!sport_handle->rx_dma_buf) {
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sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
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size, &sport_handle->rx_dma_phy, GFP_KERNEL);
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if (!sport_handle->rx_dma_buf) {
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pr_err("Failed to allocate memory for rx dma buf - Please increase uncached DMA memory region\n");
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return -ENOMEM;
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} else
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memset(sport_handle->rx_dma_buf, 0, size);
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} else
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memset(sport_handle->rx_dma_buf, 0, size);
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}
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#endif
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return 0;
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}
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static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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struct snd_soc_pcm_runtime *rtd = pcm->private_data;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
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size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
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sizeof(struct ac97_frame) / 4;
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#endif
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_coherent(NULL, buf->bytes, buf->area, 0);
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buf->area = NULL;
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#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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if (sport_handle->tx_dma_buf)
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dma_free_coherent(NULL, size, \
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sport_handle->tx_dma_buf, 0);
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sport_handle->tx_dma_buf = NULL;
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} else {
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if (sport_handle->rx_dma_buf)
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dma_free_coherent(NULL, size, \
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sport_handle->rx_dma_buf, 0);
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sport_handle->rx_dma_buf = NULL;
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}
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#endif
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}
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}
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static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret;
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pr_debug("%s enter\n", __func__);
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
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.ops = &bf5xx_pcm_ac97_ops,
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.pcm_new = bf5xx_pcm_ac97_new,
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.pcm_free = bf5xx_pcm_free_dma_buffers,
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};
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static int bf5xx_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform);
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}
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static int bf5xx_soc_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
|
|
}
|
|
|
|
static struct platform_driver bf5xx_pcm_driver = {
|
|
.driver = {
|
|
.name = "bfin-ac97-pcm-audio",
|
|
},
|
|
|
|
.probe = bf5xx_soc_platform_probe,
|
|
.remove = bf5xx_soc_platform_remove,
|
|
};
|
|
|
|
module_platform_driver(bf5xx_pcm_driver);
|
|
|
|
MODULE_AUTHOR("Cliff Cai");
|
|
MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
|
|
MODULE_LICENSE("GPL");
|