339 lines
8.6 KiB
C
339 lines
8.6 KiB
C
/*
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* linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
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*
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* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
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* Copyright (C) 2006 Applied Data Systems
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*
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* Rewritten for the SoC audio subsystem (Based on PXA2xx code):
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* Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
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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 version 2 as
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* published by the Free Software Foundation.
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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/device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.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 <mach/dma.h>
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#include <mach/hardware.h>
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#include <mach/ep93xx-regs.h>
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#include "ep93xx-pcm.h"
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static const struct snd_pcm_hardware ep93xx_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_BLOCK_TRANSFER),
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.rates = SNDRV_PCM_RATE_8000_48000,
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.rate_min = SNDRV_PCM_RATE_8000,
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.rate_max = SNDRV_PCM_RATE_48000,
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.formats = (SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE),
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.buffer_bytes_max = 131072,
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.period_bytes_min = 32,
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.period_bytes_max = 32768,
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.periods_min = 1,
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.periods_max = 32,
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.fifo_size = 32,
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};
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struct ep93xx_runtime_data
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{
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struct ep93xx_dma_m2p_client cl;
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struct ep93xx_pcm_dma_params *params;
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int pointer_bytes;
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struct tasklet_struct period_tasklet;
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int periods;
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struct ep93xx_dma_buffer buf[32];
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};
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static void ep93xx_pcm_period_elapsed(unsigned long data)
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{
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struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
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snd_pcm_period_elapsed(substream);
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}
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static void ep93xx_pcm_buffer_started(void *cookie,
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struct ep93xx_dma_buffer *buf)
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{
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}
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static void ep93xx_pcm_buffer_finished(void *cookie,
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struct ep93xx_dma_buffer *buf,
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int bytes, int error)
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{
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struct snd_pcm_substream *substream = cookie;
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struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
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if (buf == rtd->buf + rtd->periods - 1)
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rtd->pointer_bytes = 0;
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else
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rtd->pointer_bytes += buf->size;
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if (!error) {
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ep93xx_dma_m2p_submit_recursive(&rtd->cl, buf);
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tasklet_schedule(&rtd->period_tasklet);
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} else {
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snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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}
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}
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static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
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struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai;
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struct ep93xx_pcm_dma_params *dma_params;
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struct ep93xx_runtime_data *rtd;
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int ret;
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dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
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snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
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rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
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if (!rtd)
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return -ENOMEM;
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memset(&rtd->period_tasklet, 0, sizeof(rtd->period_tasklet));
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rtd->period_tasklet.func = ep93xx_pcm_period_elapsed;
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rtd->period_tasklet.data = (unsigned long)substream;
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rtd->cl.name = dma_params->name;
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rtd->cl.flags = dma_params->dma_port | EP93XX_DMA_M2P_IGNORE_ERROR |
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((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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EP93XX_DMA_M2P_TX : EP93XX_DMA_M2P_RX);
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rtd->cl.cookie = substream;
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rtd->cl.buffer_started = ep93xx_pcm_buffer_started;
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rtd->cl.buffer_finished = ep93xx_pcm_buffer_finished;
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ret = ep93xx_dma_m2p_client_register(&rtd->cl);
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if (ret < 0) {
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kfree(rtd);
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return ret;
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}
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substream->runtime->private_data = rtd;
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return 0;
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}
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static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
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{
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struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
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ep93xx_dma_m2p_client_unregister(&rtd->cl);
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kfree(rtd);
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return 0;
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}
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static int ep93xx_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 ep93xx_runtime_data *rtd = runtime->private_data;
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size_t totsize = params_buffer_bytes(params);
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size_t period = params_period_bytes(params);
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int i;
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = totsize;
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rtd->periods = (totsize + period - 1) / period;
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for (i = 0; i < rtd->periods; i++) {
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rtd->buf[i].bus_addr = runtime->dma_addr + (i * period);
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rtd->buf[i].size = period;
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if ((i + 1) * period > totsize)
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rtd->buf[i].size = totsize - (i * period);
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}
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return 0;
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}
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static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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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 ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
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int ret;
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int i;
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ret = 0;
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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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rtd->pointer_bytes = 0;
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for (i = 0; i < rtd->periods; i++)
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ep93xx_dma_m2p_submit(&rtd->cl, rtd->buf + i);
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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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ep93xx_dma_m2p_flush(&rtd->cl);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static snd_pcm_uframes_t ep93xx_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 ep93xx_runtime_data *rtd = substream->runtime->private_data;
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/* FIXME: implement this with sub-period granularity */
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return bytes_to_frames(runtime, rtd->pointer_bytes);
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}
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static int ep93xx_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 ep93xx_pcm_ops = {
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.open = ep93xx_pcm_open,
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.close = ep93xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = ep93xx_pcm_hw_params,
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.hw_free = ep93xx_pcm_hw_free,
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.trigger = ep93xx_pcm_trigger,
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.pointer = ep93xx_pcm_pointer,
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.mmap = ep93xx_pcm_mmap,
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};
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static int ep93xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, 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 = ep93xx_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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buf->bytes = size;
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return (buf->area == NULL) ? -ENOMEM : 0;
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}
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static void ep93xx_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, buf->area,
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buf->addr);
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buf->area = NULL;
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}
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}
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static u64 ep93xx_pcm_dmamask = 0xffffffff;
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static int ep93xx_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 = &ep93xx_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = 0xffffffff;
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if (dai->driver->playback.channels_min) {
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ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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return ret;
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}
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if (dai->driver->capture.channels_min) {
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ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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return ret;
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}
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return 0;
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}
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static struct snd_soc_platform_driver ep93xx_soc_platform = {
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.ops = &ep93xx_pcm_ops,
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.pcm_new = &ep93xx_pcm_new,
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.pcm_free = &ep93xx_pcm_free_dma_buffers,
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};
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static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
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}
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static int __devexit ep93xx_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 ep93xx_pcm_driver = {
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.driver = {
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.name = "ep93xx-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = ep93xx_soc_platform_probe,
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.remove = __devexit_p(ep93xx_soc_platform_remove),
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};
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static int __init ep93xx_soc_platform_init(void)
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{
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return platform_driver_register(&ep93xx_pcm_driver);
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}
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static void __exit ep93xx_soc_platform_exit(void)
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{
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platform_driver_unregister(&ep93xx_pcm_driver);
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}
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module_init(ep93xx_soc_platform_init);
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module_exit(ep93xx_soc_platform_exit);
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MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");
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MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
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MODULE_LICENSE("GPL");
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