diff options
Diffstat (limited to 'sound/soc/stmp3xxx/stmp3xxx_spdif_dai.c')
| -rw-r--r-- | sound/soc/stmp3xxx/stmp3xxx_spdif_dai.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/sound/soc/stmp3xxx/stmp3xxx_spdif_dai.c b/sound/soc/stmp3xxx/stmp3xxx_spdif_dai.c new file mode 100644 index 000000000000..504192619c43 --- /dev/null +++ b/sound/soc/stmp3xxx/stmp3xxx_spdif_dai.c @@ -0,0 +1,207 @@ +/* + * ALSA SoC SPDIF Audio Layer for STMP3xxx processor familiy + * + * Vladimir Barinov <vbarinov@embeddedalley.com> + * + * Copyright 2008 SigmaTel, Inc + * Copyright 2008 Embedded Alley Solutions, Inc + * Copyright 2008-2009 Freescale Semiconductor, Inc. + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ +#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 <mach/dma.h> +#include <mach/regs-spdif.h> +#include "stmp3xxx_pcm.h" +#include <mach/platform.h> + +#define STMP3XXX_SPDIF_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ + SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \ + SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) +#define STMP3XXX_SPDIF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S32_LE) + +static struct stmp3xxx_pcm_dma_params stmp3xxx_spdif = { + .name = "stmp3xxx spdif", + .dma_bus = STMP3XXX_BUS_APBX, + .dma_ch = 2, + .irq = IRQ_SPDIF_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 = 0; + u32 overflow_mask; + u32 underflow_mask; + + if (playback) { + ctrl_reg = __raw_readl(REGS_SPDIF_BASE + HW_SPDIF_CTRL); + underflow_mask = BM_SPDIF_CTRL_FIFO_UNDERFLOW_IRQ; + overflow_mask = BM_SPDIF_CTRL_FIFO_OVERFLOW_IRQ; + } + + if (ctrl_reg & underflow_mask) { + printk(KERN_DEBUG "underflow detected SPDIF\n"); + + if (playback) + __raw_writel(BM_SPDIF_CTRL_FIFO_UNDERFLOW_IRQ, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + } else if (ctrl_reg & overflow_mask) { + printk(KERN_DEBUG "overflow detected SPDIF\n"); + + if (playback) + __raw_writel(BM_SPDIF_CTRL_FIFO_OVERFLOW_IRQ, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + } else + printk(KERN_WARNING "Unknown SPDIF error interrupt\n"); + + return IRQ_HANDLED; +} + +static int stmp3xxx_spdif_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0; + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + if (playback) + __raw_writel(BM_SPDIF_CTRL_RUN, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET); + break; + case SNDRV_PCM_TRIGGER_STOP: + if (playback) + __raw_writel(BM_SPDIF_CTRL_RUN, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + break; + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + + default: + ret = -EINVAL; + } + + return ret; +} + +static int stmp3xxx_spdif_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + 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_SPDIF_ERROR; + cpu_dai->dma_data = &stmp3xxx_spdif; + } + + ret = request_irq(irq, stmp3xxx_err_irq, 0, "STMP3xxx SPDIF Error", + substream); + if (ret) { + printk(KERN_ERR "%s: Unable to request SPDIF error irq %d\n", + __func__, IRQ_SPDIF_ERROR); + return ret; + } + + /* Enable error interrupt */ + if (playback) { + __raw_writel(BM_SPDIF_CTRL_FIFO_OVERFLOW_IRQ, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + __raw_writel(BM_SPDIF_CTRL_FIFO_UNDERFLOW_IRQ, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + __raw_writel(BM_SPDIF_CTRL_FIFO_ERROR_IRQ_EN, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET); + } + + return 0; +} + +static void stmp3xxx_spdif_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0; + + /* Disable error interrupt */ + if (playback) { + __raw_writel(BM_SPDIF_CTRL_FIFO_ERROR_IRQ_EN, + REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR); + free_irq(IRQ_SPDIF_ERROR, substream); + } +} + +#ifdef CONFIG_PM +static int stmp3xxx_spdif_suspend(struct snd_soc_dai *cpu_dai) +{ + return 0; +} + +static int stmp3xxx_spdif_resume(struct snd_soc_dai *cpu_dai) +{ + return 0; +} +#else +#define stmp3xxx_spdif_suspend NULL +#define stmp3xxx_spdif_resume NULL +#endif /* CONFIG_PM */ + +struct snd_soc_dai_ops stmp3xxx_spdif_dai_ops = { + .startup = stmp3xxx_spdif_startup, + .shutdown = stmp3xxx_spdif_shutdown, + .trigger = stmp3xxx_spdif_trigger, +}; + +struct snd_soc_dai stmp3xxx_spdif_dai = { + .name = "stmp3xxx spdif", + .id = 0, + .suspend = stmp3xxx_spdif_suspend, + .resume = stmp3xxx_spdif_resume, + .playback = { + .channels_min = 2, + .channels_max = 2, + .rates = STMP3XXX_SPDIF_RATES, + .formats = STMP3XXX_SPDIF_FORMATS, + }, + .capture = { + .channels_min = 2, + .channels_max = 2, + .rates = STMP3XXX_SPDIF_RATES, + .formats = STMP3XXX_SPDIF_FORMATS, + }, + .ops = &stmp3xxx_spdif_dai_ops, +}; +EXPORT_SYMBOL_GPL(stmp3xxx_spdif_dai); + +static int __init stmp3xxx_spdif_dai_init(void) +{ + return snd_soc_register_dai(&stmp3xxx_spdif_dai); +} + +static void __exit stmp3xxx_spdif_dai_exit(void) +{ + snd_soc_unregister_dai(&stmp3xxx_spdif_dai); +} +module_init(stmp3xxx_spdif_dai_init); +module_exit(stmp3xxx_spdif_dai_exit); + +MODULE_AUTHOR("Vladimir Barinov"); +MODULE_DESCRIPTION("stmp3xxx SPDIF DAI"); +MODULE_LICENSE("GPL"); |