mirror of https://gitee.com/openkylin/linux.git
418 lines
11 KiB
C
418 lines
11 KiB
C
/*
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* omap-pcm.c -- ALSA PCM interface for the OMAP SoC
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*
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* Copyright (C) 2008 Nokia Corporation
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*
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* Contact: Jarkko Nikula <jhnikula@gmail.com>
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* Peter Ujfalusi <peter.ujfalusi@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/dma-mapping.h>
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#include <linux/slab.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 <plat/dma.h>
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#include "omap-pcm.h"
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static const struct snd_pcm_hardware omap_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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.period_bytes_min = 32,
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.period_bytes_max = 64 * 1024,
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.periods_min = 2,
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.periods_max = 255,
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.buffer_bytes_max = 128 * 1024,
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};
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struct omap_runtime_data {
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spinlock_t lock;
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struct omap_pcm_dma_data *dma_data;
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int dma_ch;
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int period_index;
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};
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static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
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{
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struct snd_pcm_substream *substream = data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct omap_runtime_data *prtd = runtime->private_data;
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unsigned long flags;
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if ((cpu_is_omap1510())) {
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/*
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* OMAP1510 doesn't fully support DMA progress counter
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* and there is no software emulation implemented yet,
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* so have to maintain our own progress counters
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* that can be used by omap_pcm_pointer() instead.
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*/
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spin_lock_irqsave(&prtd->lock, flags);
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if ((stat == OMAP_DMA_LAST_IRQ) &&
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(prtd->period_index == runtime->periods - 1)) {
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/* we are in sync, do nothing */
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spin_unlock_irqrestore(&prtd->lock, flags);
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return;
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}
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if (prtd->period_index >= 0) {
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if (stat & OMAP_DMA_BLOCK_IRQ) {
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/* end of buffer reached, loop back */
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prtd->period_index = 0;
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} else if (stat & OMAP_DMA_LAST_IRQ) {
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/* update the counter for the last period */
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prtd->period_index = runtime->periods - 1;
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} else if (++prtd->period_index >= runtime->periods) {
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/* end of buffer missed? loop back */
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prtd->period_index = 0;
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}
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}
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spin_unlock_irqrestore(&prtd->lock, flags);
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}
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snd_pcm_period_elapsed(substream);
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}
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/* this may get called several times by oss emulation */
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static int omap_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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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct omap_runtime_data *prtd = runtime->private_data;
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struct omap_pcm_dma_data *dma_data;
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int err = 0;
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dma_data = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!dma_data)
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return 0;
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = params_buffer_bytes(params);
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if (prtd->dma_data)
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return 0;
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prtd->dma_data = dma_data;
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err = omap_request_dma(dma_data->dma_req, dma_data->name,
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omap_pcm_dma_irq, substream, &prtd->dma_ch);
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if (!err) {
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/*
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* Link channel with itself so DMA doesn't need any
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* reprogramming while looping the buffer
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*/
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omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
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}
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return err;
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}
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static int omap_pcm_hw_free(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 omap_runtime_data *prtd = runtime->private_data;
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if (prtd->dma_data == NULL)
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return 0;
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omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
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omap_free_dma(prtd->dma_ch);
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prtd->dma_data = NULL;
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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static int omap_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 omap_runtime_data *prtd = runtime->private_data;
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struct omap_pcm_dma_data *dma_data = prtd->dma_data;
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struct omap_dma_channel_params dma_params;
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int bytes;
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!prtd->dma_data)
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return 0;
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memset(&dma_params, 0, sizeof(dma_params));
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dma_params.data_type = dma_data->data_type;
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dma_params.trigger = dma_data->dma_req;
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dma_params.sync_mode = dma_data->sync_mode;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
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dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT;
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dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC;
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dma_params.src_start = runtime->dma_addr;
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dma_params.dst_start = dma_data->port_addr;
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dma_params.dst_port = OMAP_DMA_PORT_MPUI;
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dma_params.dst_fi = dma_data->packet_size;
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} else {
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dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT;
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dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
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dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
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dma_params.src_start = dma_data->port_addr;
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dma_params.dst_start = runtime->dma_addr;
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dma_params.src_port = OMAP_DMA_PORT_MPUI;
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dma_params.src_fi = dma_data->packet_size;
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}
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/*
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* Set DMA transfer frame size equal to ALSA period size and frame
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* count as no. of ALSA periods. Then with DMA frame interrupt enabled,
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* we can transfer the whole ALSA buffer with single DMA transfer but
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* still can get an interrupt at each period bounary
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*/
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bytes = snd_pcm_lib_period_bytes(substream);
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dma_params.elem_count = bytes >> dma_data->data_type;
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dma_params.frame_count = runtime->periods;
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omap_set_dma_params(prtd->dma_ch, &dma_params);
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if ((cpu_is_omap1510()))
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omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
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OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
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else
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omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
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if (!(cpu_class_is_omap1())) {
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omap_set_dma_src_burst_mode(prtd->dma_ch,
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OMAP_DMA_DATA_BURST_16);
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omap_set_dma_dest_burst_mode(prtd->dma_ch,
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OMAP_DMA_DATA_BURST_16);
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}
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return 0;
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}
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static int omap_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 omap_runtime_data *prtd = runtime->private_data;
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struct omap_pcm_dma_data *dma_data = prtd->dma_data;
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&prtd->lock, flags);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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prtd->period_index = 0;
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/* Configure McBSP internal buffer usage */
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if (dma_data->set_threshold)
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dma_data->set_threshold(substream);
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omap_start_dma(prtd->dma_ch);
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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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prtd->period_index = -1;
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omap_stop_dma(prtd->dma_ch);
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break;
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default:
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ret = -EINVAL;
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}
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spin_unlock_irqrestore(&prtd->lock, flags);
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return ret;
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}
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static snd_pcm_uframes_t omap_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 omap_runtime_data *prtd = runtime->private_data;
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dma_addr_t ptr;
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snd_pcm_uframes_t offset;
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if (cpu_is_omap1510()) {
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offset = prtd->period_index * runtime->period_size;
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} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
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ptr = omap_get_dma_dst_pos(prtd->dma_ch);
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offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
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} else {
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ptr = omap_get_dma_src_pos(prtd->dma_ch);
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offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
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}
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if (offset >= runtime->buffer_size)
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offset = 0;
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return offset;
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}
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static int omap_pcm_open(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 omap_runtime_data *prtd;
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int ret;
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snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
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/* Ensure that buffer size is a multiple of period size */
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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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prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
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if (prtd == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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spin_lock_init(&prtd->lock);
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runtime->private_data = prtd;
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out:
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return ret;
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}
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static int omap_pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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kfree(runtime->private_data);
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return 0;
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}
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static int omap_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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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static struct snd_pcm_ops omap_pcm_ops = {
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.open = omap_pcm_open,
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.close = omap_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = omap_pcm_hw_params,
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.hw_free = omap_pcm_hw_free,
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.prepare = omap_pcm_prepare,
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.trigger = omap_pcm_trigger,
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.pointer = omap_pcm_pointer,
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.mmap = omap_pcm_mmap,
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};
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static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
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static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
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int stream)
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{
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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 = omap_pcm_hardware.buffer_bytes_max;
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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_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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static void omap_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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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_writecombine(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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static int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
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struct snd_pcm *pcm)
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{
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &omap_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
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if (dai->playback.channels_min) {
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ret = omap_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 (dai->capture.channels_min) {
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ret = omap_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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struct snd_soc_platform omap_soc_platform = {
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.name = "omap-pcm-audio",
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.pcm_ops = &omap_pcm_ops,
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.pcm_new = omap_pcm_new,
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.pcm_free = omap_pcm_free_dma_buffers,
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};
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EXPORT_SYMBOL_GPL(omap_soc_platform);
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static int __init omap_soc_platform_init(void)
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{
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return snd_soc_register_platform(&omap_soc_platform);
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}
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module_init(omap_soc_platform_init);
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static void __exit omap_soc_platform_exit(void)
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{
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snd_soc_unregister_platform(&omap_soc_platform);
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}
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module_exit(omap_soc_platform_exit);
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MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
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MODULE_DESCRIPTION("OMAP PCM DMA module");
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MODULE_LICENSE("GPL");
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