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Release 4.7 sound/soc/sti/uniperif_reader.c

Directory: sound/soc/sti
/*
 * Copyright (C) STMicroelectronics SA 2015
 * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
 *          for STMicroelectronics.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>

#include <sound/soc.h>

#include "uniperif.h"

/*
 * 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; if (reader->state == UNIPERIF_STATE_STOPPED) { /* Unexpected IRQ: do nothing */ dev_warn(reader->dev, "unexpected IRQ "); return IRQ_HANDLED; } /* 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"); snd_pcm_stream_lock(reader->substream); snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN); snd_pcm_stream_unlock(reader->substream); return IRQ_HANDLED; } return ret; }

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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"); 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; } /* 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); SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader); return 0; }

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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; }

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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; 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 */ if (reader->info->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", 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"); 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->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; }

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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", __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; }

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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", __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; }

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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; } }

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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; int ret; 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); }

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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; if (reader->state != UNIPERIF_STATE_STOPPED) { /* Stop the reader */ uni_reader_stop(reader); } }

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static int uni_reader_parse_dt(struct platform_device *pdev, struct uniperif *reader) { struct uniperif_info *info; struct device_node *node = pdev->dev.of_node; const char *mode; /* Allocate memory for the info structure */ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; if (of_property_read_u32(node, "st,version", &reader->ver) || reader->ver == SND_ST_UNIPERIF_VERSION_UNKNOWN) { dev_err(&pdev->dev, "Unknown uniperipheral version "); return -EINVAL; } /* Read the device mode property */ if (of_property_read_string(node, "st,mode", &mode)) { dev_err(&pdev->dev, "uniperipheral mode not defined"); return -EINVAL; } if (strcasecmp(mode, "tdm") == 0) info->type = SND_ST_UNIPERIF_TYPE_TDM; else info->type = SND_ST_UNIPERIF_TYPE_PCM; /* Save the info structure */ reader->info = info; return 0; }

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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; ret = uni_reader_parse_dt(pdev, reader); if (ret < 0) { dev_err(reader->dev, "Failed to parse DeviceTree"); return ret; } 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"); return -EBUSY; } return 0; }

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EXPORT_SYMBOL_GPL(uni_reader_init);

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Directory: sound/soc/sti
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