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    Subject[PATCH 6/9] ASoC: Blackfin: I2S CPU DAI driver
    Date
    From: Cliff Cai <cliff.cai@analog.com>

    Signed-off-by: Cliff Cai <cliff.cai@analog.com>
    Signed-off-by: Bryan Wu <cooloney@kernel.org>
    ---
    sound/soc/blackfin/bf5xx-i2s.c | 289 ++++++++++++++++++++++++++++++++++++++++
    sound/soc/blackfin/bf5xx-i2s.h | 14 ++
    2 files changed, 303 insertions(+), 0 deletions(-)
    create mode 100644 sound/soc/blackfin/bf5xx-i2s.c
    create mode 100644 sound/soc/blackfin/bf5xx-i2s.h

    diff --git a/sound/soc/blackfin/bf5xx-i2s.c b/sound/soc/blackfin/bf5xx-i2s.c
    new file mode 100644
    index 0000000..10fc252
    --- /dev/null
    +++ b/sound/soc/blackfin/bf5xx-i2s.c
    @@ -0,0 +1,289 @@
    +/*
    + * File: sound/soc/blackfin/bf5xx-i2s.c
    + * Author: Cliff Cai <Cliff.Cai@analog.com>
    + *
    + * Created: Tue June 06 2008
    + * Description: Blackfin I2S CPU DAI driver
    + *
    + * Modified:
    + * Copyright 2008 Analog Devices Inc.
    + *
    + * Bugs: Enter bugs at http://blackfin.uclinux.org/
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + *
    + * 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, see the file COPYING, or 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 <linux/delay.h>
    +#include <sound/core.h>
    +#include <sound/pcm.h>
    +#include <sound/pcm_params.h>
    +#include <sound/initval.h>
    +#include <sound/soc.h>
    +
    +#include <asm/irq.h>
    +#include <asm/portmux.h>
    +#include <linux/mutex.h>
    +#include <linux/gpio.h>
    +
    +#include "bf5xx-sport.h"
    +#include "bf5xx-i2s.h"
    +
    +struct bf5xx_i2s_port {
    + u16 tcr1;
    + u16 rcr1;
    + u16 tcr2;
    + u16 rcr2;
    + int counter;
    +};
    +
    +static struct bf5xx_i2s_port bf5xx_i2s;
    +static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
    +
    +static struct sport_param sport_params[2] = {
    + {
    + .dma_rx_chan = CH_SPORT0_RX,
    + .dma_tx_chan = CH_SPORT0_TX,
    + .err_irq = IRQ_SPORT0_ERROR,
    + .regs = (struct sport_register *)SPORT0_TCR1,
    + },
    + {
    + .dma_rx_chan = CH_SPORT1_RX,
    + .dma_tx_chan = CH_SPORT1_TX,
    + .err_irq = IRQ_SPORT1_ERROR,
    + .regs = (struct sport_register *)SPORT1_TCR1,
    + }
    +};
    +
    +static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
    + unsigned int fmt)
    +{
    + int ret = 0;
    +
    + /* interface format:support I2S,slave mode */
    + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
    + case SND_SOC_DAIFMT_I2S:
    + break;
    + case SND_SOC_DAIFMT_LEFT_J:
    + ret = -EINVAL;
    + break;
    + default:
    + ret = -EINVAL;
    + break;
    + }
    +
    + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
    + case SND_SOC_DAIFMT_CBS_CFS:
    + ret = -EINVAL;
    + break;
    + case SND_SOC_DAIFMT_CBM_CFS:
    + ret = -EINVAL;
    + break;
    + case SND_SOC_DAIFMT_CBM_CFM:
    + break;
    + case SND_SOC_DAIFMT_CBS_CFM:
    + ret = -EINVAL;
    + break;
    + default:
    + ret = -EINVAL;
    + break;
    + }
    +
    + return ret;
    +}
    +
    +static int bf5xx_i2s_startup(struct snd_pcm_substream *substream)
    +{
    + pr_debug("%s enter\n", __func__);
    +
    + /*this counter is used for counting how many pcm streams are opened*/
    + bf5xx_i2s.counter++;
    + return 0;
    +}
    +
    +static int bf5xx_i2s_hw_params(struct snd_pcm_substream *substream,
    + struct snd_pcm_hw_params *params)
    +{
    + int ret = 0;
    +
    + bf5xx_i2s.tcr2 &= ~0x1f;
    + bf5xx_i2s.rcr2 &= ~0x1f;
    + switch (params_format(params)) {
    + case SNDRV_PCM_FORMAT_S16_LE:
    + bf5xx_i2s.tcr2 |= 15;
    + bf5xx_i2s.rcr2 |= 15;
    + break;
    + case SNDRV_PCM_FORMAT_S24_LE:
    + bf5xx_i2s.tcr2 |= 23;
    + bf5xx_i2s.rcr2 |= 23;
    + break;
    + case SNDRV_PCM_FORMAT_S32_LE:
    + bf5xx_i2s.tcr2 |= 31;
    + bf5xx_i2s.rcr2 |= 31;
    + break;
    + }
    +
    + if (bf5xx_i2s.counter == 1) {
    + /*
    + * TX and RX are not independent,they are enabled at the same time,
    + * even if only one side is running.So,we need to configure both of
    + * them at the time when the first stream is opened.
    + *
    + * CPU DAI format:I2S, slave mode.
    + */
    + ret = sport_config_rx(sport_handle, RFSR | RCKFE, RSFSE|bf5xx_i2s.rcr2, 0, 0);
    + if (ret) {
    + pr_err("SPORT is busy!\n");
    + return -EBUSY;
    + }
    +
    + ret = sport_config_tx(sport_handle, TFSR | TCKFE, TSFSE|bf5xx_i2s.tcr2, 0, 0);
    + if (ret) {
    + pr_err("SPORT is busy!\n");
    + return -EBUSY;
    + }
    + }
    +
    + return 0;
    +}
    +
    +static void bf5xx_i2s_shutdown(struct snd_pcm_substream *substream)
    +{
    + pr_debug("%s enter\n", __func__);
    + bf5xx_i2s.counter--;
    +}
    +
    +static int bf5xx_i2s_probe(struct platform_device *pdev,
    + struct snd_soc_dai *dai)
    +{
    + u16 sport_req[][7] = {
    + { P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS,
    + P_SPORT0_DRPRI, P_SPORT0_RSCLK, 0},
    + { P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS,
    + P_SPORT1_DRPRI, P_SPORT1_RSCLK, 0},
    + };
    +
    + pr_debug("%s enter\n", __func__);
    + if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) {
    + pr_err("Requesting Peripherals failed\n");
    + return -EFAULT;
    + }
    +
    + /* request DMA for SPORT */
    + sport_handle = sport_init(&sport_params[sport_num], 4, \
    + 2 * sizeof(u32), NULL);
    + if (!sport_handle) {
    + peripheral_free_list(&sport_req[sport_num][0]);
    + return -ENODEV;
    + }
    +
    + return 0;
    +}
    +
    +#ifdef CONFIG_PM
    +static int bf5xx_i2s_suspend(struct platform_device *dev,
    + struct snd_soc_dai *dai)
    +{
    + struct sport_device *sport =
    + (struct sport_device *)dai->private_data;
    +
    + pr_debug("%s : sport %d\n", __func__, dai->id);
    + if (!dai->active)
    + return 0;
    + if (dai->capture.active)
    + sport_rx_stop(sport);
    + if (dai->playback.active)
    + sport_tx_stop(sport);
    + return 0;
    +}
    +
    +static int bf5xx_i2s_resume(struct platform_device *pdev,
    + struct snd_soc_dai *dai)
    +{
    + int ret;
    + struct sport_device *sport =
    + (struct sport_device *)dai->private_data;
    +
    + pr_debug("%s : sport %d\n", __func__, dai->id);
    + if (!dai->active)
    + return 0;
    +
    + ret = sport_config_rx(sport_handle, RFSR | RCKFE, RSFSE|0x1f, 0, 0);
    + if (ret) {
    + pr_err("SPORT is busy!\n");
    + return -EBUSY;
    + }
    +
    + ret = sport_config_tx(sport_handle, TFSR | TCKFE, TSFSE|0x1f, 0, 0);
    + if (ret) {
    + pr_err("SPORT is busy!\n");
    + return -EBUSY;
    + }
    +
    + if (dai->capture.active)
    + sport_rx_start(sport);
    + if (dai->playback.active)
    + sport_tx_start(sport);
    + return 0;
    +}
    +
    +#else
    +#define bf5xx_i2s_suspend NULL
    +#define bf5xx_i2s_resume NULL
    +#endif
    +
    +#define BF5XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
    + SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
    + SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
    + SNDRV_PCM_RATE_96000)
    +
    +#define BF5XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |\
    + SNDRV_PCM_FMTBIT_S32_LE)
    +
    +struct snd_soc_dai bf5xx_i2s_dai = {
    + .name = "bf5xx-i2s",
    + .id = 0,
    + .type = SND_SOC_DAI_I2S,
    + .probe = bf5xx_i2s_probe,
    + .suspend = bf5xx_i2s_suspend,
    + .resume = bf5xx_i2s_resume,
    + .playback = {
    + .channels_min = 2,
    + .channels_max = 2,
    + .rates = BF5XX_I2S_RATES,
    + .formats = BF5XX_I2S_FORMATS,},
    + .capture = {
    + .channels_min = 2,
    + .channels_max = 2,
    + .rates = BF5XX_I2S_RATES,
    + .formats = BF5XX_I2S_FORMATS,},
    + .ops = {
    + .startup = bf5xx_i2s_startup,
    + .shutdown = bf5xx_i2s_shutdown,
    + .hw_params = bf5xx_i2s_hw_params,},
    + .dai_ops = {
    + .set_fmt = bf5xx_i2s_set_dai_fmt,
    + },
    +};
    +EXPORT_SYMBOL_GPL(bf5xx_i2s_dai);
    +
    +/* Module information */
    +MODULE_AUTHOR("Cliff Cai");
    +MODULE_DESCRIPTION("I2S driver for ADI Blackfin");
    +MODULE_LICENSE("GPL");
    +
    diff --git a/sound/soc/blackfin/bf5xx-i2s.h b/sound/soc/blackfin/bf5xx-i2s.h
    new file mode 100644
    index 0000000..7107d1a
    --- /dev/null
    +++ b/sound/soc/blackfin/bf5xx-i2s.h
    @@ -0,0 +1,14 @@
    +/*
    + * linux/sound/arm/bf5xx-i2s.h
    + *
    + * 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.
    + */
    +
    +#ifndef _BF5XX_I2S_H
    +#define _BF5XX_I2S_H
    +
    +extern struct snd_soc_dai bf5xx_i2s_dai;
    +
    +#endif
    --
    1.5.6

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