diff options
Diffstat (limited to 'sound/soc/blackfin/bf5xx-i2s.c')
| -rw-r--r-- | sound/soc/blackfin/bf5xx-i2s.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/sound/soc/blackfin/bf5xx-i2s.c b/sound/soc/blackfin/bf5xx-i2s.c new file mode 100644 index 00000000..00cc3e00 --- /dev/null +++ b/sound/soc/blackfin/bf5xx-i2s.c @@ -0,0 +1,308 @@ +/* + * 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" + +struct bf5xx_i2s_port { + u16 tcr1; + u16 rcr1; + u16 tcr2; + u16 rcr2; + int configured; +}; + +static int bf5xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, + unsigned int fmt) +{ + struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai); + struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data; + 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: + 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_i2s_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_i2s_port *bf5xx_i2s = sport_handle->private_data; + int ret = 0; + + bf5xx_i2s->tcr2 &= ~0x1f; + bf5xx_i2s->rcr2 &= ~0x1f; + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S8: + bf5xx_i2s->tcr2 |= 7; + bf5xx_i2s->rcr2 |= 7; + sport_handle->wdsize = 1; + 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->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. + */ + bf5xx_i2s->configured = 1; + 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, + struct snd_soc_dai *dai) +{ + struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai); + struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data; + + pr_debug("%s enter\n", __func__); + /* No active stream, SPORT is allowed to be configured again. */ + if (!dai->active) + bf5xx_i2s->configured = 0; +} + +#ifdef CONFIG_PM +static int bf5xx_i2s_suspend(struct snd_soc_dai *dai) +{ + struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai); + + pr_debug("%s : sport %d\n", __func__, dai->id); + + if (dai->capture_active) + sport_rx_stop(sport_handle); + if (dai->playback_active) + sport_tx_stop(sport_handle); + return 0; +} + +static int bf5xx_i2s_resume(struct snd_soc_dai *dai) +{ + struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai); + struct bf5xx_i2s_port *bf5xx_i2s = sport_handle->private_data; + int ret; + + pr_debug("%s : sport %d\n", __func__, dai->id); + + 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; +} + +#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_S8 | \ + SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S24_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +static struct snd_soc_dai_ops bf5xx_i2s_dai_ops = { + .shutdown = bf5xx_i2s_shutdown, + .hw_params = bf5xx_i2s_hw_params, + .set_fmt = bf5xx_i2s_set_dai_fmt, +}; + +static struct snd_soc_dai_driver bf5xx_i2s_dai = { + .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 = &bf5xx_i2s_dai_ops, +}; + +static int __devinit bf5xx_i2s_probe(struct platform_device *pdev) +{ + struct sport_device *sport_handle; + int ret; + + /* configure SPORT for I2S */ + sport_handle = sport_init(pdev, 4, 2 * sizeof(u32), + sizeof(struct bf5xx_i2s_port)); + if (!sport_handle) + return -ENODEV; + + /* register with the ASoC layers */ + ret = snd_soc_register_dai(&pdev->dev, &bf5xx_i2s_dai); + if (ret) { + pr_err("Failed to register DAI: %d\n", ret); + sport_done(sport_handle); + return ret; + } + + return 0; +} + +static int __devexit bf5xx_i2s_remove(struct platform_device *pdev) +{ + struct sport_device *sport_handle = platform_get_drvdata(pdev); + + pr_debug("%s enter\n", __func__); + + snd_soc_unregister_dai(&pdev->dev); + sport_done(sport_handle); + + return 0; +} + +static struct platform_driver bfin_i2s_driver = { + .probe = bf5xx_i2s_probe, + .remove = __devexit_p(bf5xx_i2s_remove), + .driver = { + .name = "bfin-i2s", + .owner = THIS_MODULE, + }, +}; + +static int __init bfin_i2s_init(void) +{ + return platform_driver_register(&bfin_i2s_driver); +} + +static void __exit bfin_i2s_exit(void) +{ + platform_driver_unregister(&bfin_i2s_driver); +} + +module_init(bfin_i2s_init); +module_exit(bfin_i2s_exit); + +/* Module information */ +MODULE_AUTHOR("Cliff Cai"); +MODULE_DESCRIPTION("I2S driver for ADI Blackfin"); +MODULE_LICENSE("GPL"); + |