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root/sound/soc/blackfin/bf5xx-i2s.c

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DEFINITIONS

This source file includes following definitions.
  1. bf5xx_i2s_set_dai_fmt
  2. bf5xx_i2s_startup
  3. bf5xx_i2s_hw_params
  4. bf5xx_i2s_shutdown
  5. bf5xx_i2s_probe
  6. bf5xx_i2s_remove
  7. bf5xx_i2s_suspend
  8. bf5xx_i2s_resume

/*
 * 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 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},
};

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:
                bf5xx_i2s.tcr1 |= TFSR | TCKFE;
                bf5xx_i2s.rcr1 |= RFSR | RCKFE;
                bf5xx_i2s.tcr2 |= TSFSE;
                bf5xx_i2s.rcr2 |= RSFSE;
                break;
        case SND_SOC_DAIFMT_DSP_A:
                bf5xx_i2s.tcr1 |= TFSR;
                bf5xx_i2s.rcr1 |= RFSR;
                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;
                sport_handle->wdsize = 2;
                break;
        case SNDRV_PCM_FORMAT_S24_LE:
                bf5xx_i2s.tcr2 |= 23;
                bf5xx_i2s.rcr2 |= 23;
                sport_handle->wdsize = 3;
                break;
        case SNDRV_PCM_FORMAT_S32_LE:
                bf5xx_i2s.tcr2 |= 31;
                bf5xx_i2s.rcr2 |= 31;
                sport_handle->wdsize = 4;
                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:slave mode.
                 */
                ret = sport_config_rx(sport_handle, bf5xx_i2s.rcr1,
                                      bf5xx_i2s.rcr2, 0, 0);
                if (ret) {
                        pr_err("SPORT is busy!\n");
                        return -EBUSY;
                }

                ret = sport_config_tx(sport_handle, bf5xx_i2s.tcr1,
                                      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)
{
        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;
}

static void bf5xx_i2s_remove(struct platform_device *pdev,
                           struct snd_soc_dai *dai)
{
        pr_debug("%s enter\n", __func__);
        peripheral_free_list(&sport_req[sport_num][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,
        .remove = bf5xx_i2s_remove,
        .suspend = bf5xx_i2s_suspend,
        .resume = bf5xx_i2s_resume,
        .playback = {
                .channels_min = 1,
                .channels_max = 2,
                .rates = BF5XX_I2S_RATES,
                .formats = BF5XX_I2S_FORMATS,},
        .capture = {
                .channels_min = 1,
                .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");


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