diff options
Diffstat (limited to 'sound/soc/sti/uniperif_reader.c')
| -rw-r--r-- | sound/soc/sti/uniperif_reader.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/sound/soc/sti/uniperif_reader.c b/sound/soc/sti/uniperif_reader.c new file mode 100644 index 000000000..065c5f0d1 --- /dev/null +++ b/sound/soc/sti/uniperif_reader.c @@ -0,0 +1,436 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) STMicroelectronics SA 2015 + * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com> + * for STMicroelectronics. + */ + +#include <sound/soc.h> + +#include "uniperif.h" + +#define UNIPERIF_READER_I2S_IN 0 /* reader id connected to I2S/TDM TX bus */ +/* + * Note: snd_pcm_hardware is linked to DMA controller but is declared here to + * integrate unireader capability in term of rate and supported channels + */ +static const struct snd_pcm_hardware uni_reader_pcm_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID, + .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE, + + .rates = SNDRV_PCM_RATE_CONTINUOUS, + .rate_min = 8000, + .rate_max = 96000, + + .channels_min = 2, + .channels_max = 8, + + .periods_min = 2, + .periods_max = 48, + + .period_bytes_min = 128, + .period_bytes_max = 64 * PAGE_SIZE, + .buffer_bytes_max = 256 * PAGE_SIZE +}; + +/* + * uni_reader_irq_handler + * In case of error audio stream is stopped; stop action is protected via PCM + * stream lock to avoid race condition with trigger callback. + */ +static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id) +{ + irqreturn_t ret = IRQ_NONE; + struct uniperif *reader = dev_id; + unsigned int status; + + spin_lock(&reader->irq_lock); + if (!reader->substream) + goto irq_spin_unlock; + + snd_pcm_stream_lock(reader->substream); + if (reader->state == UNIPERIF_STATE_STOPPED) { + /* Unexpected IRQ: do nothing */ + dev_warn(reader->dev, "unexpected IRQ\n"); + goto stream_unlock; + } + + /* Get interrupt status & clear them immediately */ + status = GET_UNIPERIF_ITS(reader); + SET_UNIPERIF_ITS_BCLR(reader, status); + + /* Check for fifo overflow error */ + if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) { + dev_err(reader->dev, "FIFO error detected\n"); + + snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN); + + ret = IRQ_HANDLED; + } + +stream_unlock: + snd_pcm_stream_unlock(reader->substream); +irq_spin_unlock: + spin_unlock(&reader->irq_lock); + + return ret; +} + +static int uni_reader_prepare_pcm(struct snd_pcm_runtime *runtime, + struct uniperif *reader) +{ + int slot_width; + + /* 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\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(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\n"); + return -EINVAL; + } + + /* 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\n", __func__); + return -EINVAL; + } + + SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2); + SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); + + return 0; +} + +static int uni_reader_prepare_tdm(struct snd_pcm_runtime *runtime, + struct uniperif *reader) +{ + int frame_size; /* user tdm frame size in bytes */ + /* default unip TDM_WORD_POS_X_Y */ + unsigned int word_pos[4] = { + 0x04060002, 0x0C0E080A, 0x14161012, 0x1C1E181A}; + + frame_size = sti_uniperiph_get_user_frame_size(runtime); + + /* fix 16/0 format */ + SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader); + SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader); + + /* number of words inserted on the TDM line */ + SET_UNIPERIF_I2S_FMT_NUM_CH(reader, frame_size / 4 / 2); + + SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); + SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader); + SET_UNIPERIF_TDM_ENABLE_TDM_ENABLE(reader); + + /* + * set the timeslots allocation for words in FIFO + * + * HW bug: (LSB word < MSB word) => this config is not possible + * So if we want (LSB word < MSB) word, then it shall be + * handled by user + */ + sti_uniperiph_get_tdm_word_pos(reader, word_pos); + SET_UNIPERIF_TDM_WORD_POS(reader, 1_2, word_pos[WORD_1_2]); + SET_UNIPERIF_TDM_WORD_POS(reader, 3_4, word_pos[WORD_3_4]); + SET_UNIPERIF_TDM_WORD_POS(reader, 5_6, word_pos[WORD_5_6]); + SET_UNIPERIF_TDM_WORD_POS(reader, 7_8, word_pos[WORD_7_8]); + + return 0; +} + +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, ret; + + /* The reader should be stopped */ + if (reader->state != UNIPERIF_STATE_STOPPED) { + dev_err(reader->dev, "%s: invalid reader state %d\n", __func__, + reader->state); + return -EINVAL; + } + + /* Calculate transfer size (in fifo cells and bytes) for frame count */ + if (reader->type == SND_ST_UNIPERIF_TYPE_TDM) { + /* transfer size = unip frame size (in 32 bits FIFO cell) */ + transfer_size = + sti_uniperiph_get_user_frame_size(runtime) / 4; + } else { + 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\n", + trigger_limit); + return -EINVAL; + } + + SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit); + + if (UNIPERIF_TYPE_IS_TDM(reader)) + ret = uni_reader_prepare_tdm(runtime, reader); + else + ret = uni_reader_prepare_pcm(runtime, reader); + if (ret) + return ret; + + 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\n"); + return -EINVAL; + } + + /* Data clocking (changing) on the rising/falling edge */ + switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); + SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); + break; + case SND_SOC_DAIFMT_NB_IF: + SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); + SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader); + break; + case SND_SOC_DAIFMT_IB_NF: + SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader); + SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); + break; + case SND_SOC_DAIFMT_IB_IF: + SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader); + SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader); + break; + } + + /* 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->underflow_enabled) { + SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader); + SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader); + } + + /* Reset uniperipheral reader */ + return sti_uniperiph_reset(reader); +} + +static int uni_reader_start(struct uniperif *reader) +{ + /* The reader should be stopped */ + if (reader->state != UNIPERIF_STATE_STOPPED) { + dev_err(reader->dev, "%s: invalid reader state\n", __func__); + return -EINVAL; + } + + /* Enable reader interrupts (and clear possible stalled ones) */ + SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader); + SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader); + + /* Launch the reader */ + SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader); + + /* Update state to started */ + reader->state = UNIPERIF_STATE_STARTED; + return 0; +} + +static int uni_reader_stop(struct uniperif *reader) +{ + /* The reader should not be in stopped state */ + if (reader->state == UNIPERIF_STATE_STOPPED) { + dev_err(reader->dev, "%s: invalid reader state\n", __func__); + return -EINVAL; + } + + /* Turn the reader off */ + SET_UNIPERIF_CTRL_OPERATION_OFF(reader); + + /* Disable interrupts */ + SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader)); + + /* Update state to stopped and return */ + reader->state = UNIPERIF_STATE_STOPPED; + + return 0; +} + +static int uni_reader_trigger(struct snd_pcm_substream *substream, + int cmd, struct snd_soc_dai *dai) +{ + struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai); + struct uniperif *reader = priv->dai_data.uni; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + return uni_reader_start(reader); + case SNDRV_PCM_TRIGGER_STOP: + return uni_reader_stop(reader); + default: + return -EINVAL; + } +} + +static int uni_reader_startup(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; + unsigned long flags; + int ret; + + spin_lock_irqsave(&reader->irq_lock, flags); + reader->substream = substream; + spin_unlock_irqrestore(&reader->irq_lock, flags); + + if (!UNIPERIF_TYPE_IS_TDM(reader)) + return 0; + + /* refine hw constraint in tdm mode */ + ret = snd_pcm_hw_rule_add(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_CHANNELS, + sti_uniperiph_fix_tdm_chan, + reader, SNDRV_PCM_HW_PARAM_CHANNELS, + -1); + if (ret < 0) + return ret; + + return snd_pcm_hw_rule_add(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_FORMAT, + sti_uniperiph_fix_tdm_format, + reader, SNDRV_PCM_HW_PARAM_FORMAT, + -1); +} + +static void uni_reader_shutdown(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; + unsigned long flags; + + spin_lock_irqsave(&reader->irq_lock, flags); + if (reader->state != UNIPERIF_STATE_STOPPED) { + /* Stop the reader */ + uni_reader_stop(reader); + } + reader->substream = NULL; + spin_unlock_irqrestore(&reader->irq_lock, flags); +} + +static const struct snd_soc_dai_ops uni_reader_dai_ops = { + .startup = uni_reader_startup, + .shutdown = uni_reader_shutdown, + .prepare = uni_reader_prepare, + .trigger = uni_reader_trigger, + .hw_params = sti_uniperiph_dai_hw_params, + .set_fmt = sti_uniperiph_dai_set_fmt, + .set_tdm_slot = sti_uniperiph_set_tdm_slot +}; + +int uni_reader_init(struct platform_device *pdev, + struct uniperif *reader) +{ + int ret = 0; + + reader->dev = &pdev->dev; + reader->state = UNIPERIF_STATE_STOPPED; + reader->dai_ops = &uni_reader_dai_ops; + + if (UNIPERIF_TYPE_IS_TDM(reader)) + reader->hw = &uni_tdm_hw; + else + reader->hw = &uni_reader_pcm_hw; + + ret = devm_request_irq(&pdev->dev, reader->irq, + uni_reader_irq_handler, IRQF_SHARED, + dev_name(&pdev->dev), reader); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to request IRQ\n"); + return -EBUSY; + } + + spin_lock_init(&reader->irq_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(uni_reader_init); |