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linux-sg2042/sound/soc/blackfin/bf5xx-tdm.c

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/*
* File: sound/soc/blackfin/bf5xx-tdm.c
* Author: Barry Song <Barry.Song@analog.com>
*
* Created: Thurs June 04 2009
* Description: Blackfin I2S(TDM) CPU DAI driver
* Even though TDM mode can be as part of I2S DAI, but there
* are so much difference in configuration and data flow,
* it's very ugly to integrate I2S and TDM into a module
*
* Modified:
* Copyright 2009 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 <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-tdm.h"
static int bf5xx_tdm_set_dai_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
int ret = 0;
/* interface format:support TDM,slave mode */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_DSP_A:
break;
default:
printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
ret = -EINVAL;
break;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
break;
case SND_SOC_DAIFMT_CBS_CFS:
case SND_SOC_DAIFMT_CBM_CFS:
case SND_SOC_DAIFMT_CBS_CFM:
ret = -EINVAL;
break;
default:
printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
ret = -EINVAL;
break;
}
return ret;
}
static int bf5xx_tdm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data;
int ret = 0;
bf5xx_tdm->tcr2 &= ~0x1f;
bf5xx_tdm->rcr2 &= ~0x1f;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S32_LE:
bf5xx_tdm->tcr2 |= 31;
bf5xx_tdm->rcr2 |= 31;
sport_handle->wdsize = 4;
break;
/* at present, we only support 32bit transfer */
default:
pr_err("not supported PCM format yet\n");
return -EINVAL;
break;
}
if (!bf5xx_tdm->configured) {
/*
* 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_tdm->rcr1,
bf5xx_tdm->rcr2, 0, 0);
if (ret) {
pr_err("SPORT is busy!\n");
return -EBUSY;
}
ret = sport_config_tx(sport_handle, bf5xx_tdm->tcr1,
bf5xx_tdm->tcr2, 0, 0);
if (ret) {
pr_err("SPORT is busy!\n");
return -EBUSY;
}
bf5xx_tdm->configured = 1;
}
return 0;
}
static void bf5xx_tdm_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data;
/* No active stream, SPORT is allowed to be configured again. */
if (!dai->active)
bf5xx_tdm->configured = 0;
}
static int bf5xx_tdm_set_channel_map(struct snd_soc_dai *dai,
unsigned int tx_num, unsigned int *tx_slot,
unsigned int rx_num, unsigned int *rx_slot)
{
struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data;
int i;
unsigned int slot;
unsigned int tx_mapped = 0, rx_mapped = 0;
if ((tx_num > BFIN_TDM_DAI_MAX_SLOTS) ||
(rx_num > BFIN_TDM_DAI_MAX_SLOTS))
return -EINVAL;
for (i = 0; i < tx_num; i++) {
slot = tx_slot[i];
if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
(!(tx_mapped & (1 << slot)))) {
bf5xx_tdm->tx_map[i] = slot;
tx_mapped |= 1 << slot;
} else
return -EINVAL;
}
for (i = 0; i < rx_num; i++) {
slot = rx_slot[i];
if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
(!(rx_mapped & (1 << slot)))) {
bf5xx_tdm->rx_map[i] = slot;
rx_mapped |= 1 << slot;
} else
return -EINVAL;
}
return 0;
}
#ifdef CONFIG_PM
static int bf5xx_tdm_suspend(struct snd_soc_dai *dai)
{
struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
if (dai->playback_active)
sport_tx_stop(sport);
if (dai->capture_active)
sport_rx_stop(sport);
/* isolate sync/clock pins from codec while sports resume */
peripheral_free_list(sport->pin_req);
return 0;
}
static int bf5xx_tdm_resume(struct snd_soc_dai *dai)
{
int ret;
struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
ret = sport_set_multichannel(sport, 8, 0xFF, 1);
if (ret) {
pr_err("SPORT is busy!\n");
ret = -EBUSY;
}
ret = sport_config_rx(sport, 0, 0x1F, 0, 0);
if (ret) {
pr_err("SPORT is busy!\n");
ret = -EBUSY;
}
ret = sport_config_tx(sport, 0, 0x1F, 0, 0);
if (ret) {
pr_err("SPORT is busy!\n");
ret = -EBUSY;
}
peripheral_request_list(sport->pin_req, "soc-audio");
return 0;
}
#else
#define bf5xx_tdm_suspend NULL
#define bf5xx_tdm_resume NULL
#endif
static struct snd_soc_dai_ops bf5xx_tdm_dai_ops = {
.hw_params = bf5xx_tdm_hw_params,
.set_fmt = bf5xx_tdm_set_dai_fmt,
.shutdown = bf5xx_tdm_shutdown,
.set_channel_map = bf5xx_tdm_set_channel_map,
};
static struct snd_soc_dai_driver bf5xx_tdm_dai = {
.suspend = bf5xx_tdm_suspend,
.resume = bf5xx_tdm_resume,
.playback = {
.channels_min = 2,
.channels_max = 8,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S32_LE,},
.capture = {
.channels_min = 2,
.channels_max = 8,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S32_LE,},
.ops = &bf5xx_tdm_dai_ops,
};
static int __devinit bfin_tdm_probe(struct platform_device *pdev)
{
struct sport_device *sport_handle;
int ret;
/* configure SPORT for TDM */
sport_handle = sport_init(pdev, 4, 8 * sizeof(u32),
sizeof(struct bf5xx_tdm_port));
if (!sport_handle)
return -ENODEV;
/* SPORT works in TDM mode */
ret = sport_set_multichannel(sport_handle, 8, 0xFF, 1);
if (ret) {
pr_err("SPORT is busy!\n");
ret = -EBUSY;
goto sport_config_err;
}
ret = sport_config_rx(sport_handle, 0, 0x1F, 0, 0);
if (ret) {
pr_err("SPORT is busy!\n");
ret = -EBUSY;
goto sport_config_err;
}
ret = sport_config_tx(sport_handle, 0, 0x1F, 0, 0);
if (ret) {
pr_err("SPORT is busy!\n");
ret = -EBUSY;
goto sport_config_err;
}
ret = snd_soc_register_dai(&pdev->dev, &bf5xx_tdm_dai);
if (ret) {
pr_err("Failed to register DAI: %d\n", ret);
goto sport_config_err;
}
return 0;
sport_config_err:
sport_done(sport_handle);
return ret;
}
static int __devexit bfin_tdm_remove(struct platform_device *pdev)
{
struct sport_device *sport_handle = platform_get_drvdata(pdev);
snd_soc_unregister_dai(&pdev->dev);
sport_done(sport_handle);
return 0;
}
static struct platform_driver bfin_tdm_driver = {
.probe = bfin_tdm_probe,
.remove = __devexit_p(bfin_tdm_remove),
.driver = {
.name = "bfin-tdm",
.owner = THIS_MODULE,
},
};
static int __init bfin_tdm_init(void)
{
return platform_driver_register(&bfin_tdm_driver);
}
module_init(bfin_tdm_init);
static void __exit bfin_tdm_exit(void)
{
platform_driver_unregister(&bfin_tdm_driver);
}
module_exit(bfin_tdm_exit);
/* Module information */
MODULE_AUTHOR("Barry Song");
MODULE_DESCRIPTION("TDM driver for ADI Blackfin");
MODULE_LICENSE("GPL");
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