437 lines
12 KiB
C
437 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) STMicroelectronics SA 2015
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* Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
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* for STMicroelectronics.
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*/
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#include <sound/soc.h>
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#include "uniperif.h"
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#define UNIPERIF_READER_I2S_IN 0 /* reader id connected to I2S/TDM TX bus */
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/*
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* Note: snd_pcm_hardware is linked to DMA controller but is declared here to
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* integrate unireader capability in term of rate and supported channels
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*/
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static const struct snd_pcm_hardware uni_reader_pcm_hw = {
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.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID,
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.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE,
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.rates = SNDRV_PCM_RATE_CONTINUOUS,
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.rate_min = 8000,
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.rate_max = 96000,
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.channels_min = 2,
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.channels_max = 8,
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.periods_min = 2,
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.periods_max = 48,
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.period_bytes_min = 128,
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.period_bytes_max = 64 * PAGE_SIZE,
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.buffer_bytes_max = 256 * PAGE_SIZE
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};
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/*
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* uni_reader_irq_handler
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* In case of error audio stream is stopped; stop action is protected via PCM
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* stream lock to avoid race condition with trigger callback.
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*/
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static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
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{
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irqreturn_t ret = IRQ_NONE;
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struct uniperif *reader = dev_id;
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unsigned int status;
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spin_lock(&reader->irq_lock);
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if (!reader->substream)
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goto irq_spin_unlock;
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snd_pcm_stream_lock(reader->substream);
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if (reader->state == UNIPERIF_STATE_STOPPED) {
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/* Unexpected IRQ: do nothing */
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dev_warn(reader->dev, "unexpected IRQ\n");
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goto stream_unlock;
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}
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/* Get interrupt status & clear them immediately */
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status = GET_UNIPERIF_ITS(reader);
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SET_UNIPERIF_ITS_BCLR(reader, status);
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/* Check for fifo overflow error */
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if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {
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dev_err(reader->dev, "FIFO error detected\n");
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snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);
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ret = IRQ_HANDLED;
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}
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stream_unlock:
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snd_pcm_stream_unlock(reader->substream);
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irq_spin_unlock:
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spin_unlock(&reader->irq_lock);
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return ret;
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}
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static int uni_reader_prepare_pcm(struct snd_pcm_runtime *runtime,
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struct uniperif *reader)
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{
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int slot_width;
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/* Force slot width to 32 in I2S mode */
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if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)
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== SND_SOC_DAIFMT_I2S) {
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slot_width = 32;
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} else {
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switch (runtime->format) {
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case SNDRV_PCM_FORMAT_S16_LE:
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slot_width = 16;
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break;
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default:
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slot_width = 32;
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break;
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}
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}
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/* Number of bits per subframe (i.e one channel sample) on input. */
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switch (slot_width) {
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case 32:
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SET_UNIPERIF_I2S_FMT_NBIT_32(reader);
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SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
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break;
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case 16:
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SET_UNIPERIF_I2S_FMT_NBIT_16(reader);
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SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);
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break;
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default:
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dev_err(reader->dev, "subframe format not supported\n");
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return -EINVAL;
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}
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/* Configure data memory format */
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switch (runtime->format) {
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case SNDRV_PCM_FORMAT_S16_LE:
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/* One data word contains two samples */
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SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);
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break;
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case SNDRV_PCM_FORMAT_S32_LE:
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/*
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* Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
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* on the MSB then zeros (if less than 32 bytes)"...
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*/
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SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
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break;
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default:
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dev_err(reader->dev, "format not supported\n");
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return -EINVAL;
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}
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/* Number of channels must be even */
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if ((runtime->channels % 2) || (runtime->channels < 2) ||
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(runtime->channels > 10)) {
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dev_err(reader->dev, "%s: invalid nb of channels\n", __func__);
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return -EINVAL;
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}
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SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);
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SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);
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return 0;
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}
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static int uni_reader_prepare_tdm(struct snd_pcm_runtime *runtime,
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struct uniperif *reader)
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{
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int frame_size; /* user tdm frame size in bytes */
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/* default unip TDM_WORD_POS_X_Y */
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unsigned int word_pos[4] = {
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0x04060002, 0x0C0E080A, 0x14161012, 0x1C1E181A};
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frame_size = sti_uniperiph_get_user_frame_size(runtime);
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/* fix 16/0 format */
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SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
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SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
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/* number of words inserted on the TDM line */
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SET_UNIPERIF_I2S_FMT_NUM_CH(reader, frame_size / 4 / 2);
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SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);
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SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
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SET_UNIPERIF_TDM_ENABLE_TDM_ENABLE(reader);
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/*
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* set the timeslots allocation for words in FIFO
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*
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* HW bug: (LSB word < MSB word) => this config is not possible
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* So if we want (LSB word < MSB) word, then it shall be
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* handled by user
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*/
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sti_uniperiph_get_tdm_word_pos(reader, word_pos);
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SET_UNIPERIF_TDM_WORD_POS(reader, 1_2, word_pos[WORD_1_2]);
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SET_UNIPERIF_TDM_WORD_POS(reader, 3_4, word_pos[WORD_3_4]);
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SET_UNIPERIF_TDM_WORD_POS(reader, 5_6, word_pos[WORD_5_6]);
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SET_UNIPERIF_TDM_WORD_POS(reader, 7_8, word_pos[WORD_7_8]);
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return 0;
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}
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static int uni_reader_prepare(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
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struct uniperif *reader = priv->dai_data.uni;
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struct snd_pcm_runtime *runtime = substream->runtime;
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int transfer_size, trigger_limit, ret;
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/* The reader should be stopped */
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if (reader->state != UNIPERIF_STATE_STOPPED) {
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dev_err(reader->dev, "%s: invalid reader state %d\n", __func__,
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reader->state);
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return -EINVAL;
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}
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/* Calculate transfer size (in fifo cells and bytes) for frame count */
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if (reader->type == SND_ST_UNIPERIF_TYPE_TDM) {
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/* transfer size = unip frame size (in 32 bits FIFO cell) */
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transfer_size =
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sti_uniperiph_get_user_frame_size(runtime) / 4;
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} else {
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transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;
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}
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/* Calculate number of empty cells available before asserting DREQ */
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if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)
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trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;
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else
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/*
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* Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0
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* FDMA_TRIGGER_LIMIT also controls when the state switches
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* from OFF or STANDBY to AUDIO DATA.
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*/
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trigger_limit = transfer_size;
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/* Trigger limit must be an even number */
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if ((!trigger_limit % 2) ||
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(trigger_limit != 1 && transfer_size % 2) ||
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(trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {
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dev_err(reader->dev, "invalid trigger limit %d\n",
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trigger_limit);
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return -EINVAL;
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}
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SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);
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if (UNIPERIF_TYPE_IS_TDM(reader))
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ret = uni_reader_prepare_tdm(runtime, reader);
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else
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ret = uni_reader_prepare_pcm(runtime, reader);
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if (ret)
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return ret;
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switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
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SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
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SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
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break;
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case SND_SOC_DAIFMT_RIGHT_J:
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SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);
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SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
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break;
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default:
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dev_err(reader->dev, "format not supported\n");
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return -EINVAL;
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}
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/* Data clocking (changing) on the rising/falling edge */
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switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_NB_NF:
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SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);
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break;
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case SND_SOC_DAIFMT_NB_IF:
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SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);
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break;
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case SND_SOC_DAIFMT_IB_NF:
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SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader);
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break;
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case SND_SOC_DAIFMT_IB_IF:
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SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
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SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader);
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break;
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}
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/* Clear any pending interrupts */
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SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));
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SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);
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/* Set the interrupt mask */
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SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);
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SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
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SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);
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/* Enable underflow recovery interrupts */
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if (reader->underflow_enabled) {
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SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);
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SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);
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}
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/* Reset uniperipheral reader */
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return sti_uniperiph_reset(reader);
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}
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static int uni_reader_start(struct uniperif *reader)
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{
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/* The reader should be stopped */
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if (reader->state != UNIPERIF_STATE_STOPPED) {
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dev_err(reader->dev, "%s: invalid reader state\n", __func__);
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return -EINVAL;
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}
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/* Enable reader interrupts (and clear possible stalled ones) */
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SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader);
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SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
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/* Launch the reader */
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SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader);
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/* Update state to started */
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reader->state = UNIPERIF_STATE_STARTED;
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return 0;
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}
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static int uni_reader_stop(struct uniperif *reader)
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{
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/* The reader should not be in stopped state */
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if (reader->state == UNIPERIF_STATE_STOPPED) {
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dev_err(reader->dev, "%s: invalid reader state\n", __func__);
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return -EINVAL;
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}
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/* Turn the reader off */
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SET_UNIPERIF_CTRL_OPERATION_OFF(reader);
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/* Disable interrupts */
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SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader));
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/* Update state to stopped and return */
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reader->state = UNIPERIF_STATE_STOPPED;
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return 0;
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}
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static int uni_reader_trigger(struct snd_pcm_substream *substream,
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int cmd, struct snd_soc_dai *dai)
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{
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
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struct uniperif *reader = priv->dai_data.uni;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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return uni_reader_start(reader);
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case SNDRV_PCM_TRIGGER_STOP:
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return uni_reader_stop(reader);
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default:
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return -EINVAL;
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}
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}
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static int uni_reader_startup(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
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struct uniperif *reader = priv->dai_data.uni;
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&reader->irq_lock, flags);
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reader->substream = substream;
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spin_unlock_irqrestore(&reader->irq_lock, flags);
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if (!UNIPERIF_TYPE_IS_TDM(reader))
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return 0;
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/* refine hw constraint in tdm mode */
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ret = snd_pcm_hw_rule_add(substream->runtime, 0,
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SNDRV_PCM_HW_PARAM_CHANNELS,
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sti_uniperiph_fix_tdm_chan,
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reader, SNDRV_PCM_HW_PARAM_CHANNELS,
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-1);
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if (ret < 0)
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return ret;
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return snd_pcm_hw_rule_add(substream->runtime, 0,
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SNDRV_PCM_HW_PARAM_FORMAT,
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sti_uniperiph_fix_tdm_format,
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reader, SNDRV_PCM_HW_PARAM_FORMAT,
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-1);
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}
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static void uni_reader_shutdown(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
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struct uniperif *reader = priv->dai_data.uni;
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unsigned long flags;
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spin_lock_irqsave(&reader->irq_lock, flags);
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if (reader->state != UNIPERIF_STATE_STOPPED) {
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/* Stop the reader */
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uni_reader_stop(reader);
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}
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reader->substream = NULL;
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spin_unlock_irqrestore(&reader->irq_lock, flags);
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}
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static const struct snd_soc_dai_ops uni_reader_dai_ops = {
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.startup = uni_reader_startup,
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.shutdown = uni_reader_shutdown,
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.prepare = uni_reader_prepare,
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.trigger = uni_reader_trigger,
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.hw_params = sti_uniperiph_dai_hw_params,
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.set_fmt = sti_uniperiph_dai_set_fmt,
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.set_tdm_slot = sti_uniperiph_set_tdm_slot
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};
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int uni_reader_init(struct platform_device *pdev,
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struct uniperif *reader)
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{
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int ret = 0;
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reader->dev = &pdev->dev;
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reader->state = UNIPERIF_STATE_STOPPED;
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reader->dai_ops = &uni_reader_dai_ops;
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if (UNIPERIF_TYPE_IS_TDM(reader))
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reader->hw = &uni_tdm_hw;
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else
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reader->hw = &uni_reader_pcm_hw;
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ret = devm_request_irq(&pdev->dev, reader->irq,
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uni_reader_irq_handler, IRQF_SHARED,
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dev_name(&pdev->dev), reader);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to request IRQ\n");
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return -EBUSY;
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}
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spin_lock_init(&reader->irq_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(uni_reader_init);
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