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8b5e2e396b
The bf5xx-i2s{,-pcm} and bf5xx-tdm{-pcm} drivers are nearly identical. Both are
for the same hardware each supporting a slight different subset of the hardware.
The bf5xx-i2s driver supports 2 channel I2S mode while the bf5xx-tdm driver
supports TDM mode and channel remapping. This patch adds support for TDM mode
and channel remapping to the bf5xx-i2s driver so that we'll eventually be able
to retire the bf5xx-tdm driver. Unfortunately the hardware is fixed to using 8
channels in TDM mode. The bf5xx-tdm driver jumps through a few hoops to make it
work well with other channel counts as well:
* Don't support mmap
* Translate between internal frame size (which is always 8 * sample_size)
and ALSA frame size (which depends on the channel count)
* Have special copy and silence callbacks which are aware of the mismatch
between internal and ALSA frame size
* Reduce the maximum buffer size to ensure that there is enough headroom for
dummy data.
The bf5xx-i2s driver is going to use the same mechanisms when being used int
TDM mode.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
392 lines
9.7 KiB
C
392 lines
9.7 KiB
C
/*
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* File: sound/soc/blackfin/bf5xx-i2s.c
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* Author: Cliff Cai <Cliff.Cai@analog.com>
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*
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* Created: Tue June 06 2008
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* Description: Blackfin I2S CPU DAI driver
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*
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* Modified:
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* Copyright 2008 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/delay.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/initval.h>
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#include <sound/soc.h>
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#include <asm/irq.h>
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#include <asm/portmux.h>
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#include <linux/mutex.h>
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#include <linux/gpio.h>
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#include "bf5xx-sport.h"
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#include "bf5xx-i2s-pcm.h"
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struct bf5xx_i2s_port {
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u16 tcr1;
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u16 rcr1;
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u16 tcr2;
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u16 rcr2;
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int configured;
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unsigned int slots;
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unsigned int tx_mask;
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unsigned int rx_mask;
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struct bf5xx_i2s_pcm_data tx_dma_data;
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struct bf5xx_i2s_pcm_data rx_dma_data;
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};
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static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
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unsigned int fmt)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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int ret = 0;
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/* interface format:support I2S,slave mode */
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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bf5xx_i2s->tcr1 |= TFSR | TCKFE;
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bf5xx_i2s->rcr1 |= RFSR | RCKFE;
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bf5xx_i2s->tcr2 |= TSFSE;
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bf5xx_i2s->rcr2 |= RSFSE;
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break;
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case SND_SOC_DAIFMT_DSP_A:
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bf5xx_i2s->tcr1 |= TFSR;
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bf5xx_i2s->rcr1 |= RFSR;
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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ret = -EINVAL;
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break;
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default:
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dev_err(cpu_dai->dev, "%s: Unknown DAI format type\n",
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__func__);
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ret = -EINVAL;
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break;
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}
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBM_CFM:
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break;
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case SND_SOC_DAIFMT_CBS_CFS:
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case SND_SOC_DAIFMT_CBM_CFS:
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case SND_SOC_DAIFMT_CBS_CFM:
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ret = -EINVAL;
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break;
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default:
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dev_err(cpu_dai->dev, "%s: Unknown DAI master type\n",
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__func__);
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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 int bf5xx_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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int ret = 0;
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bf5xx_i2s->tcr2 &= ~0x1f;
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bf5xx_i2s->rcr2 &= ~0x1f;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S8:
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bf5xx_i2s->tcr2 |= 7;
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bf5xx_i2s->rcr2 |= 7;
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sport_handle->wdsize = 1;
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case SNDRV_PCM_FORMAT_S16_LE:
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bf5xx_i2s->tcr2 |= 15;
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bf5xx_i2s->rcr2 |= 15;
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sport_handle->wdsize = 2;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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bf5xx_i2s->tcr2 |= 23;
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bf5xx_i2s->rcr2 |= 23;
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sport_handle->wdsize = 3;
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break;
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case SNDRV_PCM_FORMAT_S32_LE:
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bf5xx_i2s->tcr2 |= 31;
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bf5xx_i2s->rcr2 |= 31;
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sport_handle->wdsize = 4;
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break;
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}
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if (!bf5xx_i2s->configured) {
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/*
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* TX and RX are not independent,they are enabled at the
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* same time, even if only one side is running. So, we
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* need to configure both of them at the time when the first
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* stream is opened.
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*
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* CPU DAI:slave mode.
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*/
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bf5xx_i2s->configured = 1;
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ret = sport_config_rx(sport_handle, bf5xx_i2s->rcr1,
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bf5xx_i2s->rcr2, 0, 0);
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if (ret) {
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dev_err(dai->dev, "SPORT is busy!\n");
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return -EBUSY;
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}
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ret = sport_config_tx(sport_handle, bf5xx_i2s->tcr1,
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bf5xx_i2s->tcr2, 0, 0);
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if (ret) {
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dev_err(dai->dev, "SPORT is busy!\n");
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return -EBUSY;
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}
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}
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return 0;
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}
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static void bf5xx_i2s_shutdown(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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dev_dbg(dai->dev, "%s enter\n", __func__);
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/* No active stream, SPORT is allowed to be configured again. */
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if (!dai->active)
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bf5xx_i2s->configured = 0;
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}
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static int bf5xx_i2s_set_channel_map(struct snd_soc_dai *dai,
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unsigned int tx_num, unsigned int *tx_slot,
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unsigned int rx_num, unsigned int *rx_slot)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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unsigned int tx_mapped = 0, rx_mapped = 0;
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unsigned int slot;
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int i;
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if ((tx_num > BFIN_TDM_DAI_MAX_SLOTS) ||
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(rx_num > BFIN_TDM_DAI_MAX_SLOTS))
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return -EINVAL;
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for (i = 0; i < tx_num; i++) {
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slot = tx_slot[i];
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if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
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(!(tx_mapped & (1 << slot)))) {
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bf5xx_i2s->tx_dma_data.map[i] = slot;
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tx_mapped |= 1 << slot;
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} else
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return -EINVAL;
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}
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for (i = 0; i < rx_num; i++) {
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slot = rx_slot[i];
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if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
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(!(rx_mapped & (1 << slot)))) {
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bf5xx_i2s->rx_dma_data.map[i] = slot;
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rx_mapped |= 1 << slot;
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} else
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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 int bf5xx_i2s_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
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unsigned int rx_mask, int slots, int width)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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if (slots % 8 != 0 || slots > 8)
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return -EINVAL;
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if (width != 32)
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return -EINVAL;
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bf5xx_i2s->slots = slots;
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bf5xx_i2s->tx_mask = tx_mask;
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bf5xx_i2s->rx_mask = rx_mask;
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bf5xx_i2s->tx_dma_data.tdm_mode = slots != 0;
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bf5xx_i2s->rx_dma_data.tdm_mode = slots != 0;
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return sport_set_multichannel(sport_handle, slots, tx_mask, rx_mask, 0);
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}
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#ifdef CONFIG_PM
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static int bf5xx_i2s_suspend(struct snd_soc_dai *dai)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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dev_dbg(dai->dev, "%s : sport %d\n", __func__, dai->id);
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if (dai->capture_active)
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sport_rx_stop(sport_handle);
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if (dai->playback_active)
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sport_tx_stop(sport_handle);
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return 0;
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}
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static int bf5xx_i2s_resume(struct snd_soc_dai *dai)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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int ret;
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dev_dbg(dai->dev, "%s : sport %d\n", __func__, dai->id);
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ret = sport_config_rx(sport_handle, bf5xx_i2s->rcr1,
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bf5xx_i2s->rcr2, 0, 0);
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if (ret) {
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dev_err(dai->dev, "SPORT is busy!\n");
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return -EBUSY;
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}
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ret = sport_config_tx(sport_handle, bf5xx_i2s->tcr1,
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bf5xx_i2s->tcr2, 0, 0);
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if (ret) {
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dev_err(dai->dev, "SPORT is busy!\n");
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return -EBUSY;
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}
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return sport_set_multichannel(sport_handle, bf5xx_i2s->slots,
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bf5xx_i2s->tx_mask, bf5xx_i2s->rx_mask, 0);
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}
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#else
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#define bf5xx_i2s_suspend NULL
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#define bf5xx_i2s_resume NULL
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#endif
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static int bf5xx_i2s_dai_probe(struct snd_soc_dai *dai)
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{
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struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
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struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data;
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unsigned int i;
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for (i = 0; i < BFIN_TDM_DAI_MAX_SLOTS; i++) {
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bf5xx_i2s->tx_dma_data.map[i] = i;
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bf5xx_i2s->rx_dma_data.map[i] = i;
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}
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dai->playback_dma_data = &bf5xx_i2s->tx_dma_data;
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dai->capture_dma_data = &bf5xx_i2s->rx_dma_data;
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return 0;
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}
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#define BF5XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
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SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
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SNDRV_PCM_RATE_96000)
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#define BF5XX_I2S_FORMATS \
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(SNDRV_PCM_FMTBIT_S8 | \
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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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static const struct snd_soc_dai_ops bf5xx_i2s_dai_ops = {
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.shutdown = bf5xx_i2s_shutdown,
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.hw_params = bf5xx_i2s_hw_params,
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.set_fmt = bf5xx_i2s_set_dai_fmt,
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.set_tdm_slot = bf5xx_i2s_set_tdm_slot,
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.set_channel_map = bf5xx_i2s_set_channel_map,
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};
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static struct snd_soc_dai_driver bf5xx_i2s_dai = {
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.probe = bf5xx_i2s_dai_probe,
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.suspend = bf5xx_i2s_suspend,
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.resume = bf5xx_i2s_resume,
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.playback = {
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.channels_min = 2,
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.channels_max = 8,
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.rates = BF5XX_I2S_RATES,
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.formats = BF5XX_I2S_FORMATS,},
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.capture = {
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.channels_min = 2,
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.channels_max = 8,
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.rates = BF5XX_I2S_RATES,
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.formats = BF5XX_I2S_FORMATS,},
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.ops = &bf5xx_i2s_dai_ops,
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};
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static const struct snd_soc_component_driver bf5xx_i2s_component = {
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.name = "bf5xx-i2s",
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};
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static int bf5xx_i2s_probe(struct platform_device *pdev)
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{
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struct sport_device *sport_handle;
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int ret;
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/* configure SPORT for I2S */
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sport_handle = sport_init(pdev, 4, 8 * sizeof(u32),
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sizeof(struct bf5xx_i2s_port));
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if (!sport_handle)
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return -ENODEV;
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/* register with the ASoC layers */
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ret = snd_soc_register_component(&pdev->dev, &bf5xx_i2s_component,
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&bf5xx_i2s_dai, 1);
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if (ret) {
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dev_err(&pdev->dev, "Failed to register DAI: %d\n", ret);
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sport_done(sport_handle);
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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 int bf5xx_i2s_remove(struct platform_device *pdev)
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{
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struct sport_device *sport_handle = platform_get_drvdata(pdev);
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dev_dbg(&pdev->dev, "%s enter\n", __func__);
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snd_soc_unregister_component(&pdev->dev);
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sport_done(sport_handle);
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return 0;
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}
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static struct platform_driver bfin_i2s_driver = {
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.probe = bf5xx_i2s_probe,
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.remove = bf5xx_i2s_remove,
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.driver = {
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.name = "bfin-i2s",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(bfin_i2s_driver);
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/* Module information */
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MODULE_AUTHOR("Cliff Cai");
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MODULE_DESCRIPTION("I2S driver for ADI Blackfin");
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MODULE_LICENSE("GPL");
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