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Subject[PATCH 20/21] ASoC: sun4i-i2s: Add support for TDM slots
Date
From: Maxime Ripard <maxime.ripard@bootlin.com>

The i2s controller supports TDM, for up to 8 slots. Let's support the TDM
API.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
---
sound/soc/sunxi/sun4i-i2s.c | 40 ++++++++++++++++++++++++++++++++------
1 file changed, 34 insertions(+), 6 deletions(-)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index 0dac09814b65..4f76daeaaed7 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -168,6 +168,8 @@ struct sun4i_i2s {
struct reset_control *rst;

unsigned int mclk_freq;
+ unsigned int slots;
+ unsigned int slot_width;

struct snd_dmaengine_dai_dma_data capture_dma_data;
struct snd_dmaengine_dai_dma_data playback_dma_data;
@@ -287,7 +289,7 @@ static bool sun4i_i2s_oversample_is_valid(unsigned int oversample)

static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
unsigned int rate,
- unsigned int channels,
+ unsigned int slots,
unsigned int word_size)
{
struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
@@ -335,7 +337,7 @@ static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,

bclk_parent_rate = i2s->variant->get_bclk_parent_rate(i2s);
bclk_div = sun4i_i2s_get_bclk_div(i2s, bclk_parent_rate,
- rate, channels, word_size);
+ rate, slots, word_size);
if (bclk_div < 0) {
dev_err(dai->dev, "Unsupported BCLK divider: %d\n", bclk_div);
return -EINVAL;
@@ -419,6 +421,10 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
const struct snd_pcm_hw_params *params)
{
unsigned int channels = params_channels(params);
+ unsigned int slots = channels;
+
+ if (i2s->slots)
+ slots = i2s->slots;

/* Map the channels for playback and capture */
regmap_write(i2s->regmap, SUN8I_I2S_TX_CHAN_MAP_REG, 0x76543210);
@@ -428,7 +434,6 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
SUN4I_I2S_CHAN_SEL_MASK,
SUN4I_I2S_CHAN_SEL(channels));
-
regmap_update_bits(i2s->regmap, SUN8I_I2S_RX_CHAN_SEL_REG,
SUN4I_I2S_CHAN_SEL_MASK,
SUN4I_I2S_CHAN_SEL(channels));
@@ -452,10 +457,18 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int word_size = params_width(params);
unsigned int channels = params_channels(params);
+ unsigned int slots = channels;
int ret, sr, wss;
u32 width;

+ if (i2s->slots)
+ slots = i2s->slots;
+
+ if (i2s->slot_width)
+ word_size = i2s->slot_width;
+
ret = i2s->variant->set_chan_cfg(i2s, params);
if (ret < 0) {
dev_err(dai->dev, "Invalid channel configuration\n");
@@ -477,15 +490,14 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
if (sr < 0)
return -EINVAL;

- wss = i2s->variant->get_wss(i2s, params_width(params));
+ wss = i2s->variant->get_wss(i2s, word_size);
if (wss < 0)
return -EINVAL;

regmap_field_write(i2s->field_fmt_wss, wss);
regmap_field_write(i2s->field_fmt_sr, sr);

- return sun4i_i2s_set_clk_rate(dai, params_rate(params),
- channels, params_width(params));
+ return sun4i_i2s_set_clk_rate(dai, params_rate(params), slots, word_size);
}

static int sun4i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s,
@@ -785,10 +797,26 @@ static int sun4i_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
return 0;
}

+static int sun4i_i2s_set_tdm_slot(struct snd_soc_dai *dai,
+ unsigned int tx_mask, unsigned int rx_mask,
+ int slots, int slot_width)
+{
+ struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ if (slots > 8)
+ return -EINVAL;
+
+ i2s->slots = slots;
+ i2s->slot_width = slot_width;
+
+ return 0;
+}
+
static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
.hw_params = sun4i_i2s_hw_params,
.set_fmt = sun4i_i2s_set_fmt,
.set_sysclk = sun4i_i2s_set_sysclk,
+ .set_tdm_slot = sun4i_i2s_set_tdm_slot,
.trigger = sun4i_i2s_trigger,
};

--
git-series 0.9.1
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