sound/soc/amd/raven/acp3x-i2s.c
Source file repositories/reference/linux-study-clean/sound/soc/amd/raven/acp3x-i2s.c
File Facts
- System
- Linux kernel
- Corpus path
sound/soc/amd/raven/acp3x-i2s.c- Extension
.c- Size
- 8332 bytes
- Lines
- 332
- Domain
- Driver Families
- Bucket
- sound/soc
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/platform_device.hlinux/module.hlinux/err.hlinux/io.hsound/pcm_params.hsound/soc.hsound/soc-dai.hlinux/dma-mapping.hacp3x.h
Detected Declarations
function acp3x_i2s_set_fmtfunction acp3x_i2s_set_tdm_slotfunction acp3x_i2s_hwparamsfunction acp3x_i2s_triggerfunction acp3x_dai_probe
Annotated Snippet
switch (rtd->i2s_instance) {
case I2S_BT_INSTANCE:
reg_val = mmACP_BTTDM_ITER;
frmt_reg = mmACP_BTTDM_TXFRMT;
break;
case I2S_SP_INSTANCE:
default:
reg_val = mmACP_I2STDM_ITER;
frmt_reg = mmACP_I2STDM_TXFRMT;
}
} else {
switch (rtd->i2s_instance) {
case I2S_BT_INSTANCE:
reg_val = mmACP_BTTDM_IRER;
frmt_reg = mmACP_BTTDM_RXFRMT;
break;
case I2S_SP_INSTANCE:
default:
reg_val = mmACP_I2STDM_IRER;
frmt_reg = mmACP_I2STDM_RXFRMT;
}
}
if (adata->tdm_mode) {
val = rv_readl(rtd->acp3x_base + reg_val);
rv_writel(val | 0x2, rtd->acp3x_base + reg_val);
rv_writel(adata->tdm_fmt, rtd->acp3x_base + frmt_reg);
}
val = rv_readl(rtd->acp3x_base + reg_val);
val &= ~ACP3x_ITER_IRER_SAMP_LEN_MASK;
val = val | (rtd->xfer_resolution << 3);
rv_writel(val, rtd->acp3x_base + reg_val);
return 0;
}
static int acp3x_i2s_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct i2s_stream_instance *rtd;
u32 val, period_bytes, reg_val, ier_val, water_val;
u32 buf_size, buf_reg;
int ret;
rtd = substream->runtime->private_data;
period_bytes = frames_to_bytes(substream->runtime,
substream->runtime->period_size);
buf_size = frames_to_bytes(substream->runtime,
substream->runtime->buffer_size);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
rtd->bytescount = acp_get_byte_count(rtd,
substream->stream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
switch (rtd->i2s_instance) {
case I2S_BT_INSTANCE:
water_val =
mmACP_BT_TX_INTR_WATERMARK_SIZE;
reg_val = mmACP_BTTDM_ITER;
ier_val = mmACP_BTTDM_IER;
buf_reg = mmACP_BT_TX_RINGBUFSIZE;
break;
case I2S_SP_INSTANCE:
default:
water_val =
mmACP_I2S_TX_INTR_WATERMARK_SIZE;
reg_val = mmACP_I2STDM_ITER;
ier_val = mmACP_I2STDM_IER;
buf_reg = mmACP_I2S_TX_RINGBUFSIZE;
}
} else {
switch (rtd->i2s_instance) {
case I2S_BT_INSTANCE:
water_val =
mmACP_BT_RX_INTR_WATERMARK_SIZE;
reg_val = mmACP_BTTDM_IRER;
ier_val = mmACP_BTTDM_IER;
buf_reg = mmACP_BT_RX_RINGBUFSIZE;
break;
case I2S_SP_INSTANCE:
default:
water_val =
mmACP_I2S_RX_INTR_WATERMARK_SIZE;
reg_val = mmACP_I2STDM_IRER;
ier_val = mmACP_I2STDM_IER;
buf_reg = mmACP_I2S_RX_RINGBUFSIZE;
}
}
rv_writel(period_bytes, rtd->acp3x_base + water_val);
rv_writel(buf_size, rtd->acp3x_base + buf_reg);
Annotation
- Immediate include surface: `linux/platform_device.h`, `linux/module.h`, `linux/err.h`, `linux/io.h`, `sound/pcm_params.h`, `sound/soc.h`, `sound/soc-dai.h`, `linux/dma-mapping.h`.
- Detected declarations: `function acp3x_i2s_set_fmt`, `function acp3x_i2s_set_tdm_slot`, `function acp3x_i2s_hwparams`, `function acp3x_i2s_trigger`, `function acp3x_dai_probe`.
- Atlas domain: Driver Families / sound/soc.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.