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|
/*
* omap-mcbsp.c -- OMAP ALSA SoC DAI driver using McBSP port
*
* Copyright (C) 2008 Nokia Corporation
*
* Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
* Peter Ujfalusi <peter.ujfalusi@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <plat/dma.h>
#include <plat/mcbsp.h>
#include "omap-mcbsp.h"
#include "omap-pcm.h"
#define OMAP_MCBSP_RATES (SNDRV_PCM_RATE_8000_96000)
#define OMAP_MCBSP_SOC_SINGLE_S16_EXT(xname, xmin, xmax, \
xhandler_get, xhandler_put) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
.info = omap_mcbsp_st_info_volsw, \
.get = xhandler_get, .put = xhandler_put, \
.private_value = (unsigned long) &(struct soc_mixer_control) \
{.min = xmin, .max = xmax} }
struct omap_mcbsp_data {
unsigned int bus_id;
struct omap_mcbsp_reg_cfg regs;
unsigned int fmt;
/*
* Flags indicating is the bus already activated and configured by
* another substream
*/
int active;
int configured;
unsigned int in_freq;
int clk_div;
int wlen;
};
static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];
/*
* Stream DMA parameters. DMA request line and port address are set runtime
* since they are different between OMAP1 and later OMAPs
*/
static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2];
static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct omap_mcbsp_data *mcbsp_data = snd_soc_dai_get_drvdata(cpu_dai);
struct omap_pcm_dma_data *dma_data;
int dma_op_mode = omap_mcbsp_get_dma_op_mode(mcbsp_data->bus_id);
int words;
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
if (dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
/*
* Configure McBSP threshold based on either:
* packet_size, when the sDMA is in packet mode, or
* based on the period size.
*/
if (dma_data->packet_size)
words = dma_data->packet_size;
else
words = snd_pcm_lib_period_bytes(substream) /
(mcbsp_data->wlen / 8);
else
words = 1;
/* Configure McBSP internal buffer usage */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
omap_mcbsp_set_tx_threshold(mcbsp_data->bus_id, words);
else
omap_mcbsp_set_rx_threshold(mcbsp_data->bus_id, words);
}
static int omap_mcbsp_hwrule_min_buffersize(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_interval *buffer_size = hw_param_interval(params,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE);
struct snd_interval *channels = hw_param_interval(params,
SNDRV_PCM_HW_PARAM_CHANNELS);
struct omap_mcbsp_data *mcbsp_data = rule->private;
struct snd_interval frames;
int size;
snd_interval_any(&frames);
size = omap_mcbsp_get_fifo_size(mcbsp_data->bus_id);
frames.min = size / channels->min;
frames.integer = 1;
return snd_interval_refine(buffer_size, &frames);
}
static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct omap_mcbsp_data *mcbsp_data = snd_soc_dai_get_drvdata(cpu_dai);
int bus_id = mcbsp_data->bus_id;
int err = 0;
if (!cpu_dai->active)
err = omap_mcbsp_request(bus_id);
/*
* OMAP3 McBSP FIFO is word structured.
* McBSP2 has 1024 + 256 = 1280 word long buffer,
* McBSP1,3,4,5 has 128 word long buffer
* This means that the size of the FIFO depends on the sample format.
* For example on McBSP3:
* 16bit samples: size is 128 * 2 = 256 bytes
* 32bit samples: size is 128 * 4 = 512 bytes
* It is simpler to place constraint for buffer and period based on
* channels.
* McBSP3 as example again (16 or 32 bit samples):
* 1 channel (mono): size is 128 frames (128 words)
* 2 channels (stereo): size is 128 / 2 = 64 frames (2 * 64 words)
* 4 channels: size is 128 / 4 = 32 frames (4 * 32 words)
*/
if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
/*
* Rule for the buffer size. We should not allow
* smaller buffer than the FIFO size to avoid underruns
*/
snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS,
omap_mcbsp_hwrule_min_buffersize,
mcbsp_data,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
/* Make sure, that the period size is always even */
snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2);
}
return err;
}
static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct omap_mcbsp_data *mcbsp_data = snd_soc_dai_get_drvdata(cpu_dai);
if (!cpu_dai->active) {
omap_mcbsp_free(mcbsp_data->bus_id);
mcbsp_data->configured = 0;
}
}
static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *cpu_dai)
{
struct omap_mcbsp_data *mcbsp_data = snd_soc_dai_get_drvdata(cpu_dai);
int err = 0, play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
mcbsp_data->active++;
omap_mcbsp_start(mcbsp_data->bus_id, play, !play);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
omap_mcbsp_stop(mcbsp_data->bus_id, play, !play);
mcbsp_data->active--;
break;
default:
err = -EINVAL;
}
return err;
}
static snd_pcm_sframes_t omap_mcbsp_dai_delay(
struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct omap_mcbsp_data *mcbsp_data = snd_soc_dai_get_drvdata(cpu_dai);
u16 fifo_use;
snd_pcm_sframes_t delay;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
fifo_use = omap_mcbsp_get_tx_delay(mcbsp_data->bus_id);
else
fifo_use = omap_mcbsp_get_rx_delay(mcbsp_data->bus_id);
/*
* Divide the used locations with the channel count to get th
|