342 lines
8.6 KiB
C
342 lines
8.6 KiB
C
/*
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* imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
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*
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* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This code is based on code copyrighted by Freescale,
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* Liam Girdwood, Javier Martin and probably others.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dmaengine.h>
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#include <sound/core.h>
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#include <sound/initval.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 <mach/dma.h>
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#include "imx-ssi.h"
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struct imx_pcm_runtime_data {
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int period_bytes;
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int periods;
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int dma;
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unsigned long offset;
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unsigned long size;
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void *buf;
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int period_time;
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struct dma_async_tx_descriptor *desc;
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struct dma_chan *dma_chan;
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struct imx_dma_data dma_data;
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};
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static void audio_dma_irq(void *data)
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{
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struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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iprtd->offset += iprtd->period_bytes;
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iprtd->offset %= iprtd->period_bytes * iprtd->periods;
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snd_pcm_period_elapsed(substream);
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}
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static bool filter(struct dma_chan *chan, void *param)
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{
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struct imx_pcm_runtime_data *iprtd = param;
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if (!imx_dma_is_general_purpose(chan))
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return false;
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chan->private = &iprtd->dma_data;
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return true;
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}
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static int imx_ssi_dma_alloc(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_soc_pcm_runtime *rtd = substream->private_data;
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struct imx_pcm_dma_params *dma_params;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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struct dma_slave_config slave_config;
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dma_cap_mask_t mask;
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enum dma_slave_buswidth buswidth;
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int ret;
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dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
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iprtd->dma_data.priority = DMA_PRIO_HIGH;
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iprtd->dma_data.dma_request = dma_params->dma;
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/* Try to grab a DMA channel */
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
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if (!iprtd->dma_chan)
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return -EINVAL;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
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break;
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S24_LE:
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buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
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break;
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default:
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return 0;
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}
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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slave_config.direction = DMA_TO_DEVICE;
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slave_config.dst_addr = dma_params->dma_addr;
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slave_config.dst_addr_width = buswidth;
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slave_config.dst_maxburst = dma_params->burstsize;
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} else {
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slave_config.direction = DMA_FROM_DEVICE;
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slave_config.src_addr = dma_params->dma_addr;
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slave_config.src_addr_width = buswidth;
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slave_config.src_maxburst = dma_params->burstsize;
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}
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ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
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if (ret)
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return ret;
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return 0;
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}
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static int snd_imx_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_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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unsigned long dma_addr;
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struct dma_chan *chan;
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struct imx_pcm_dma_params *dma_params;
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int ret;
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dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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ret = imx_ssi_dma_alloc(substream, params);
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if (ret)
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return ret;
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chan = iprtd->dma_chan;
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iprtd->size = params_buffer_bytes(params);
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iprtd->periods = params_periods(params);
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iprtd->period_bytes = params_period_bytes(params);
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iprtd->offset = 0;
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iprtd->period_time = HZ / (params_rate(params) /
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params_period_size(params));
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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dma_addr = runtime->dma_addr;
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iprtd->buf = (unsigned int *)substream->dma_buffer.area;
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iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
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iprtd->period_bytes * iprtd->periods,
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iprtd->period_bytes,
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substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
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DMA_TO_DEVICE : DMA_FROM_DEVICE);
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if (!iprtd->desc) {
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dev_err(&chan->dev->device, "cannot prepare slave dma\n");
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return -EINVAL;
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}
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iprtd->desc->callback = audio_dma_irq;
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iprtd->desc->callback_param = substream;
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return 0;
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}
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static int snd_imx_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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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if (iprtd->dma_chan) {
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dma_release_channel(iprtd->dma_chan);
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iprtd->dma_chan = NULL;
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}
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return 0;
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}
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static int snd_imx_pcm_prepare(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 imx_pcm_dma_params *dma_params;
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dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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return 0;
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}
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static int snd_imx_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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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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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dmaengine_submit(iprtd->desc);
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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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dmaengine_terminate_all(iprtd->dma_chan);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static snd_pcm_uframes_t snd_imx_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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
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bytes_to_frames(substream->runtime, iprtd->offset));
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return bytes_to_frames(substream->runtime, iprtd->offset);
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}
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static struct snd_pcm_hardware snd_imx_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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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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.rate_min = 8000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
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.period_bytes_min = 128,
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.period_bytes_max = 65535, /* Limited by SDMA engine */
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.periods_min = 2,
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.periods_max = 255,
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.fifo_size = 0,
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};
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static int snd_imx_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 imx_pcm_runtime_data *iprtd;
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int ret;
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iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
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if (iprtd == NULL)
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return -ENOMEM;
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runtime->private_data = iprtd;
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ret = snd_pcm_hw_constraint_integer(substream->runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0) {
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kfree(iprtd);
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return ret;
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}
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snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
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return 0;
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}
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static int snd_imx_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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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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kfree(iprtd);
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return 0;
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}
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static struct snd_pcm_ops imx_pcm_ops = {
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.open = snd_imx_open,
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.close = snd_imx_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_imx_pcm_hw_params,
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.hw_free = snd_imx_pcm_hw_free,
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.prepare = snd_imx_pcm_prepare,
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.trigger = snd_imx_pcm_trigger,
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.pointer = snd_imx_pcm_pointer,
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.mmap = snd_imx_pcm_mmap,
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};
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static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
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.ops = &imx_pcm_ops,
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.pcm_new = imx_pcm_new,
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.pcm_free = imx_pcm_free,
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};
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static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
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{
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struct imx_ssi *ssi = platform_get_drvdata(pdev);
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ssi->dma_params_tx.burstsize = 6;
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ssi->dma_params_rx.burstsize = 4;
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return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
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}
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static int __devexit imx_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;
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}
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static struct platform_driver imx_pcm_driver = {
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.driver = {
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.name = "imx-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = imx_soc_platform_probe,
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.remove = __devexit_p(imx_soc_platform_remove),
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};
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static int __init snd_imx_pcm_init(void)
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{
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return platform_driver_register(&imx_pcm_driver);
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}
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module_init(snd_imx_pcm_init);
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static void __exit snd_imx_pcm_exit(void)
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{
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platform_driver_unregister(&imx_pcm_driver);
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}
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module_exit(snd_imx_pcm_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:imx-pcm-audio");
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