diff options
Diffstat (limited to 'sound/soc/mxs/mxs-spdif-dai.c')
| -rw-r--r-- | sound/soc/mxs/mxs-spdif-dai.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/sound/soc/mxs/mxs-spdif-dai.c b/sound/soc/mxs/mxs-spdif-dai.c new file mode 100644 index 000000000000..1b45b595b90d --- /dev/null +++ b/sound/soc/mxs/mxs-spdif-dai.c @@ -0,0 +1,203 @@ +/* + * ALSA SoC SPDIF Audio Layer for MXS + * + * Copyright (C) 2008-2010 Freescale Semiconductor, Inc. + * + * Based on stmp3xxx_spdif_dai.c + * Vladimir Barinov <vbarinov@embeddedalley.com> + * Copyright 2008 SigmaTel, Inc + * Copyright 2008 Embedded Alley Solutions, 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/dma-mapping.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/soc.h> +#include <mach/dma.h> +#include <mach/hardware.h> + +#include "../codecs/mxs_spdif.h" +#include "mxs-pcm.h" + +#define REGS_SPDIF_BASE IO_ADDRESS(SPDIF_PHYS_ADDR) + +struct mxs_pcm_dma_params mxs_spdif = { + .name = "mxs spdif", + .dma_ch = MXS_DMA_CHANNEL_AHB_APBX_SPDIF, + .irq = IRQ_SPDIF_DMA, +}; + +static irqreturn_t mxs_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 mxs_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 mxs_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; + snd_soc_dai_set_dma_data(cpu_dai, substream, &mxs_spdif); + } + + ret = request_irq(irq, mxs_err_irq, 0, "Mxs 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 mxs_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 mxs_spdif_suspend(struct snd_soc_dai *cpu_dai) +{ + return 0; +} + +static int mxs_spdif_resume(struct snd_soc_dai *cpu_dai) +{ + return 0; +} +#else +#define mxs_spdif_suspend NULL +#define mxs_spdif_resume NULL +#endif /* CONFIG_PM */ + +struct snd_soc_dai_ops mxs_spdif_dai_ops = { + .startup = mxs_spdif_startup, + .shutdown = mxs_spdif_shutdown, + .trigger = mxs_spdif_trigger, +}; + +struct snd_soc_dai mxs_spdif_dai = { + .name = "mxs-spdif", + .id = 0, + .suspend = mxs_spdif_suspend, + .resume = mxs_spdif_resume, + .playback = { + .channels_min = 2, + .channels_max = 2, + .rates = MXS_SPDIF_RATES, + .formats = MXS_SPDIF_FORMATS, + }, + .capture = { + .channels_min = 2, + .channels_max = 2, + .rates = MXS_SPDIF_RATES, + .formats = MXS_SPDIF_FORMATS, + }, + .ops = &mxs_spdif_dai_ops, +}; +EXPORT_SYMBOL_GPL(mxs_spdif_dai); + +static int __init mxs_spdif_dai_init(void) +{ + return snd_soc_register_dai(&mxs_spdif_dai); +} + +static void __exit mxs_spdif_dai_exit(void) +{ + snd_soc_unregister_dai(&mxs_spdif_dai); +} +module_init(mxs_spdif_dai_init); +module_exit(mxs_spdif_dai_exit); + +MODULE_AUTHOR("Vladimir Barinov"); +MODULE_DESCRIPTION("MXS SPDIF DAI"); +MODULE_LICENSE("GPL"); |