diff options
Diffstat (limited to 'sound/soc/stmp3xxx/stmp3xxx_dai.c')
| -rw-r--r-- | sound/soc/stmp3xxx/stmp3xxx_dai.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/sound/soc/stmp3xxx/stmp3xxx_dai.c b/sound/soc/stmp3xxx/stmp3xxx_dai.c new file mode 100644 index 000000000000..0fa7e1d89bf1 --- /dev/null +++ b/sound/soc/stmp3xxx/stmp3xxx_dai.c @@ -0,0 +1,224 @@ +/* + * ASoC Audio Layer for Freescale STMP37XX/STMP378X ADC/DAC + * + * Author: Vladislav Buzov <vbuzov@embeddedalley.com> + * + * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/initval.h> +#include <sound/soc.h> + +#include <asm/dma.h> +#include <mach/regs-audioin.h> +#include <mach/regs-audioout.h> +#include "stmp3xxx_pcm.h" + +#define STMP3XXX_ADC_RATES SNDRV_PCM_RATE_8000_192000 +#define STMP3XXX_ADC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +struct stmp3xxx_pcm_dma_params stmp3xxx_audio_in = { + .name = "stmp3xxx adc", + .dma_bus = STMP3XXX_BUS_APBX, + .dma_ch = 0, + .irq = IRQ_ADC_DMA, +}; + +struct stmp3xxx_pcm_dma_params stmp3xxx_audio_out = { + .name = "stmp3xxx dac", + .dma_bus = STMP3XXX_BUS_APBX, + .dma_ch = 1, + .irq = IRQ_DAC_DMA, +}; + +static irqreturn_t stmp3xxx_err_irq(int irq, void *dev_id) +{ + struct snd_pcm_substream *substream = dev_id; + int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0; + u32 ctrl_reg; + u32 overflow_mask; + u32 underflow_mask; + + if (playback) { + ctrl_reg = HW_AUDIOOUT_CTRL_RD(); + underflow_mask = BM_AUDIOOUT_CTRL_FIFO_UNDERFLOW_IRQ; + overflow_mask = BM_AUDIOOUT_CTRL_FIFO_OVERFLOW_IRQ; + } else { + ctrl_reg = HW_AUDIOIN_CTRL_RD(); + underflow_mask = BM_AUDIOIN_CTRL_FIFO_UNDERFLOW_IRQ; + overflow_mask = BM_AUDIOIN_CTRL_FIFO_OVERFLOW_IRQ; + } + + if (ctrl_reg & underflow_mask) { + printk(KERN_DEBUG "%s underflow detected\n", + playback ? "DAC" : "ADC"); + + if (playback) + HW_AUDIOOUT_CTRL_CLR( + BM_AUDIOOUT_CTRL_FIFO_UNDERFLOW_IRQ); + else + HW_AUDIOIN_CTRL_CLR( + BM_AUDIOIN_CTRL_FIFO_UNDERFLOW_IRQ); + + } else if (ctrl_reg & overflow_mask) { + printk(KERN_DEBUG "%s overflow detected\n", + playback ? "DAC" : "ADC"); + + if (playback) + HW_AUDIOOUT_CTRL_CLR( + BM_AUDIOOUT_CTRL_FIFO_OVERFLOW_IRQ); + else + HW_AUDIOIN_CTRL_CLR(BM_AUDIOIN_CTRL_FIFO_OVERFLOW_IRQ); + } else + printk(KERN_WARNING "Unknown DAC error interrupt\n"); + + return IRQ_HANDLED; +} + +static int stmp3xxx_adc_trigger(struct snd_pcm_substream *substream, int cmd) +{ + int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0; + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + if (playback) + HW_AUDIOOUT_CTRL_SET(BM_AUDIOOUT_CTRL_RUN); + else + HW_AUDIOIN_CTRL_SET(BM_AUDIOIN_CTRL_RUN); + break; + + case SNDRV_PCM_TRIGGER_STOP: + if (playback) + HW_AUDIOOUT_CTRL_CLR(BM_AUDIOOUT_CTRL_RUN); + else + HW_AUDIOIN_CTRL_CLR(BM_AUDIOIN_CTRL_RUN); + break; + + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static int stmp3xxx_adc_startup(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai; + int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0; + int irq; + int ret; + + if (playback) { + irq = IRQ_DAC_ERROR; + cpu_dai->dma_data = &stmp3xxx_audio_out; + } else { + irq = IRQ_ADC_ERROR; + cpu_dai->dma_data = &stmp3xxx_audio_in; + } + + ret = request_irq(irq, stmp3xxx_err_irq, 0, "STMP3xxx DAC/ADC Error", + substream); + if (ret) { + printk(KERN_ERR "%s: Unable to request ADC/DAC error irq %d\n", + __func__, IRQ_DAC_ERROR); + return ret; + } + + /* Enable error interrupt */ + if (playback) { + HW_AUDIOOUT_CTRL_CLR(BM_AUDIOOUT_CTRL_FIFO_OVERFLOW_IRQ); + HW_AUDIOOUT_CTRL_CLR(BM_AUDIOOUT_CTRL_FIFO_UNDERFLOW_IRQ); + HW_AUDIOOUT_CTRL_SET(BM_AUDIOOUT_CTRL_FIFO_ERROR_IRQ_EN); + } else { + HW_AUDIOIN_CTRL_CLR(BM_AUDIOIN_CTRL_FIFO_OVERFLOW_IRQ); + HW_AUDIOIN_CTRL_CLR(BM_AUDIOIN_CTRL_FIFO_UNDERFLOW_IRQ); + HW_AUDIOIN_CTRL_SET(BM_AUDIOIN_CTRL_FIFO_ERROR_IRQ_EN); + } + + return 0; +} + +static void stmp3xxx_adc_shutdown(struct snd_pcm_substream *substream) +{ + int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0; + + /* Disable error interrupt */ + if (playback) { + HW_AUDIOOUT_CTRL_CLR(BM_AUDIOOUT_CTRL_FIFO_ERROR_IRQ_EN); + free_irq(IRQ_DAC_ERROR, substream); + } else { + HW_AUDIOIN_CTRL_CLR(BM_AUDIOIN_CTRL_FIFO_ERROR_IRQ_EN); + free_irq(IRQ_ADC_ERROR, substream); + } +} + +#ifdef CONFIG_PM +static int stmp3xxx_adc_suspend(struct platform_device *pdev, + struct snd_soc_dai *cpu_dai) +{ + return 0; +} + +static int stmp3xxx_adc_resume(struct platform_device *pdev, + struct snd_soc_dai *cpu_dai) +{ + return 0; +} +#else +#define stmp3xxx_adc_suspend NULL +#define stmp3xxx_adc_resume NULL +#endif /* CONFIG_PM */ + +struct snd_soc_dai stmp3xxx_adc_dai = { + .name = "stmp3xxx adc/dac", + .id = 0, + .type = SND_SOC_DAI_PCM, + .suspend = stmp3xxx_adc_suspend, + .resume = stmp3xxx_adc_resume, + .playback = { + .channels_min = 2, + .channels_max = 2, + .rates = STMP3XXX_ADC_RATES, + .formats = STMP3XXX_ADC_FORMATS, + }, + .capture = { + .channels_min = 2, + .channels_max = 2, + .rates = STMP3XXX_ADC_RATES, + .formats = STMP3XXX_ADC_FORMATS, + }, + .ops = { + .startup = stmp3xxx_adc_startup, + .shutdown = stmp3xxx_adc_shutdown, + .trigger = stmp3xxx_adc_trigger, + }, +}; +EXPORT_SYMBOL_GPL(stmp3xxx_adc_dai); + +MODULE_AUTHOR("Vladislav Buzov"); +MODULE_DESCRIPTION("stmp3xxx dac/adc DAI"); +MODULE_LICENSE("GPL"); |