static int uni_reader_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
struct uniperif *reader = priv->dai_data.uni;
struct snd_pcm_runtime *runtime = substream->runtime;
int transfer_size, trigger_limit;
int slot_width;
int count = 10;
/* The reader should be stopped */
if (reader->state != UNIPERIF_STATE_STOPPED) {
dev_err(reader->dev, "%s: invalid reader state %d", __func__,
reader->state);
return -EINVAL;
}
/* Calculate transfer size (in fifo cells and bytes) for frame count */
transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;
/* Calculate number of empty cells available before asserting DREQ */
if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)
trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;
else
/*
* Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0
* FDMA_TRIGGER_LIMIT also controls when the state switches
* from OFF or STANDBY to AUDIO DATA.
*/
trigger_limit = transfer_size;
/* Trigger limit must be an even number */
if ((!trigger_limit % 2) ||
(trigger_limit != 1 && transfer_size % 2) ||
(trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {
dev_err(reader->dev, "invalid trigger limit %d", trigger_limit);
return -EINVAL;
}
SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);
switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_IF:
case SND_SOC_DAIFMT_NB_IF:
SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
break;
default:
SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
}
/* Force slot width to 32 in I2S mode */
if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)
== SND_SOC_DAIFMT_I2S) {
slot_width = 32;
} else {
switch (runtime->format) {
case SNDRV_PCM_FORMAT_S16_LE:
slot_width = 16;
break;
default:
slot_width = 32;
break;
}
}
/* Number of bits per subframe (i.e one channel sample) on input. */
switch (slot_width) {
case 32:
SET_UNIPERIF_I2S_FMT_NBIT_32(reader);
SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
break;
case 16:
SET_UNIPERIF_I2S_FMT_NBIT_16(reader);
SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);
break;
default:
dev_err(reader->dev, "subframe format not supported");
return -EINVAL;
}
/* Configure data memory format */
switch (runtime->format) {
case SNDRV_PCM_FORMAT_S16_LE:
/* One data word contains two samples */
SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);
break;
case SNDRV_PCM_FORMAT_S32_LE:
/*
* Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
* on the MSB then zeros (if less than 32 bytes)"...
*/
SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
break;
default:
dev_err(reader->dev, "format not supported");
return -EINVAL;
}
switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);
break;
case SND_SOC_DAIFMT_LEFT_J:
SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
break;
case SND_SOC_DAIFMT_RIGHT_J:
SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);
SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
break;
default:
dev_err(reader->dev, "format not supported");
return -EINVAL;
}
SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);
/* Data clocking (changing) on the rising edge */
SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);
/* Number of channels must be even */
if ((runtime->channels % 2) || (runtime->channels < 2) ||
(runtime->channels > 10)) {
dev_err(reader->dev, "%s: invalid nb of channels", __func__);
return -EINVAL;
}
SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);
/* Clear any pending interrupts */
SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));
SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);
/* Set the interrupt mask */
SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);
SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);
/* Enable underflow recovery interrupts */
if (reader->info->underflow_enabled) {
SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);
SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);
}
/* Reset uniperipheral reader */
SET_UNIPERIF_SOFT_RST_SOFT_RST(reader);
while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) {
udelay(5);
count--;
}
if (!count) {
dev_err(reader->dev, "Failed to reset uniperif");
return -EIO;
}
return 0;
}
static int uni_player_prepare_pcm(struct uniperif *player,
struct snd_pcm_runtime *runtime)
{
int output_frame_size, slot_width, clk_div;
/* Force slot width to 32 in I2S mode (HW constraint) */
if ((player->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) ==
SND_SOC_DAIFMT_I2S)
slot_width = 32;
else
slot_width = snd_pcm_format_width(runtime->format);
output_frame_size = slot_width * runtime->channels;
clk_div = player->mclk / runtime->rate;
/*
* For 32 bits subframe clk_div must be a multiple of 128,
* for 16 bits must be a multiple of 64
*/
if ((slot_width == 32) && (clk_div % 128)) {
dev_err(player->dev, "%s: invalid clk_div\n", __func__);
return -EINVAL;
}
if ((slot_width == 16) && (clk_div % 64)) {
dev_err(player->dev, "%s: invalid clk_div\n", __func__);
return -EINVAL;
}
/*
* Number of bits per subframe (which is one channel sample)
* on output - Transfer 16 or 32 bits from FIFO
*/
switch (slot_width) {
case 32:
SET_UNIPERIF_I2S_FMT_NBIT_32(player);
SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(player);
break;
case 16:
SET_UNIPERIF_I2S_FMT_NBIT_16(player);
SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(player);
break;
default:
dev_err(player->dev, "subframe format not supported\n");
return -EINVAL;
}
/* Configure data memory format */
switch (runtime->format) {
case SNDRV_PCM_FORMAT_S16_LE:
/* One data word contains two samples */
SET_UNIPERIF_CONFIG_MEM_FMT_16_16(player);
break;
case SNDRV_PCM_FORMAT_S32_LE:
/*
* Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
* on the left than zeros (if less than 32 bytes)"... ;-)
*/
SET_UNIPERIF_CONFIG_MEM_FMT_16_0(player);
break;
default:
dev_err(player->dev, "format not supported\n");
return -EINVAL;
}
/* Set rounding to off */
SET_UNIPERIF_CTRL_ROUNDING_OFF(player);
/* Set clock divisor */
SET_UNIPERIF_CTRL_DIVIDER(player, clk_div / (2 * output_frame_size));
/* Number of channelsmust be even*/
if ((runtime->channels % 2) || (runtime->channels < 2) ||
(runtime->channels > 10)) {
dev_err(player->dev, "%s: invalid nb of channels\n", __func__);
return -EINVAL;
}
SET_UNIPERIF_I2S_FMT_NUM_CH(player, runtime->channels / 2);
/* Set 1-bit audio format to disabled */
SET_UNIPERIF_CONFIG_ONE_BIT_AUD_DISABLE(player);
SET_UNIPERIF_I2S_FMT_ORDER_MSB(player);
/* No iec958 formatting as outputting to DAC */
SET_UNIPERIF_CTRL_SPDIF_FMT_OFF(player);
return 0;
}
