333 lines
8.7 KiB
C
333 lines
8.7 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 <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-mx1-mx2.h>
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#include "imx-ssi.h"
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struct imx_pcm_runtime_data {
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int sg_count;
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struct scatterlist *sg_list;
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int period;
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int periods;
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unsigned long dma_addr;
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int dma;
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struct snd_pcm_substream *substream;
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unsigned long offset;
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unsigned long size;
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unsigned long period_cnt;
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void *buf;
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int period_time;
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};
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/* Called by the DMA framework when a period has elapsed */
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static void imx_ssi_dma_progression(int channel, void *data,
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struct scatterlist *sg)
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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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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if (!sg)
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return;
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runtime = iprtd->substream->runtime;
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iprtd->offset = sg->dma_address - runtime->dma_addr;
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snd_pcm_period_elapsed(iprtd->substream);
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}
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static void imx_ssi_dma_callback(int channel, void *data)
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{
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pr_err("%s shouldn't be called\n", __func__);
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}
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static void snd_imx_dma_err_callback(int channel, void *data, int err)
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{
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struct snd_pcm_substream *substream = data;
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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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snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
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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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int ret;
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pr_err("DMA timeout on channel %d -%s%s%s%s\n",
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channel,
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err & IMX_DMA_ERR_BURST ? " burst" : "",
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err & IMX_DMA_ERR_REQUEST ? " request" : "",
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err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
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err & IMX_DMA_ERR_BUFFER ? " buffer" : "");
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imx_dma_disable(iprtd->dma);
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ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
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IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
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substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
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DMA_MODE_WRITE : DMA_MODE_READ);
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if (!ret)
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imx_dma_enable(iprtd->dma);
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}
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static int imx_ssi_dma_alloc(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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struct snd_pcm_runtime *runtime = substream->runtime;
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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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int ret;
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dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
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iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
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if (iprtd->dma < 0) {
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pr_err("Failed to claim the audio DMA\n");
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return -ENODEV;
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}
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ret = imx_dma_setup_handlers(iprtd->dma,
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imx_ssi_dma_callback,
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snd_imx_dma_err_callback, substream);
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if (ret)
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goto out;
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ret = imx_dma_setup_progression_handler(iprtd->dma,
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imx_ssi_dma_progression);
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if (ret) {
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pr_err("Failed to setup the DMA handler\n");
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goto out;
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}
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ret = imx_dma_config_channel(iprtd->dma,
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IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
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IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
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dma_params->dma, 1);
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if (ret < 0) {
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pr_err("Cannot configure DMA channel: %d\n", ret);
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goto out;
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}
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imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
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return 0;
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out:
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imx_dma_free(iprtd->dma);
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return ret;
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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_pcm_runtime *runtime = substream->runtime;
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struct imx_pcm_runtime_data *iprtd = runtime->private_data;
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int i;
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unsigned long dma_addr;
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imx_ssi_dma_alloc(substream);
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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 = 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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if (iprtd->sg_count != iprtd->periods) {
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kfree(iprtd->sg_list);
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iprtd->sg_list = kcalloc(iprtd->periods + 1,
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sizeof(struct scatterlist), GFP_KERNEL);
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if (!iprtd->sg_list)
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return -ENOMEM;
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iprtd->sg_count = iprtd->periods + 1;
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}
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sg_init_table(iprtd->sg_list, iprtd->sg_count);
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dma_addr = runtime->dma_addr;
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for (i = 0; i < iprtd->periods; i++) {
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iprtd->sg_list[i].page_link = 0;
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iprtd->sg_list[i].offset = 0;
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iprtd->sg_list[i].dma_address = dma_addr;
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iprtd->sg_list[i].length = iprtd->period;
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dma_addr += iprtd->period;
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}
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/* close the loop */
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iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
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iprtd->sg_list[iprtd->sg_count - 1].length = 0;
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iprtd->sg_list[iprtd->sg_count - 1].page_link =
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((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
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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 >= 0) {
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imx_dma_free(iprtd->dma);
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iprtd->dma = -EINVAL;
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}
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kfree(iprtd->sg_list);
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iprtd->sg_list = NULL;
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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_pcm_runtime *runtime = substream->runtime;
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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 imx_pcm_runtime_data *iprtd = runtime->private_data;
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int err;
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dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
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iprtd->substream = substream;
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iprtd->buf = (unsigned int *)substream->dma_buffer.area;
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iprtd->period_cnt = 0;
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pr_debug("%s: buf: %p period: %d periods: %d\n",
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__func__, iprtd->buf, iprtd->period, iprtd->periods);
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err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
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IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
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substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
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DMA_MODE_WRITE : DMA_MODE_READ);
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if (err)
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return err;
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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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imx_dma_enable(iprtd->dma);
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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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imx_dma_disable(iprtd->dma);
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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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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 = 16 * 1024,
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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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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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return ret;
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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 struct snd_pcm_ops imx_pcm_ops = {
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.open = snd_imx_open,
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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 imx_soc_platform_dma = {
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.name = "imx-audio",
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.pcm_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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struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,
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struct imx_ssi *ssi)
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{
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ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
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ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
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return &imx_soc_platform_dma;
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}
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