// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) STMicroelectronics SA 2015
* Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
* for STMicroelectronics.
*/
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <sound/asoundef.h>
#include <sound/soc.h>
#include "uniperif.h"
/*
* Some hardware-related definitions
*/
/* sys config registers definitions */
#define SYS_CFG_AUDIO_GLUE 0xA4
/*
* Driver specific types.
*/
#define UNIPERIF_PLAYER_CLK_ADJ_MIN -999999
#define UNIPERIF_PLAYER_CLK_ADJ_MAX 1000000
#define UNIPERIF_PLAYER_I2S_OUT 1 /* player id connected to I2S/TDM TX bus */
/*
* Note: snd_pcm_hardware is linked to DMA controller but is declared here to
* integrate DAI_CPU capability in term of rate and supported channels
*/
static const struct snd_pcm_hardware uni_player_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 = 192000,
.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_player_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_player_irq_handler(int irq, void *dev_id)
{
irqreturn_t ret = IRQ_NONE;
struct uniperif *player = dev_id;
unsigned int status;
unsigned int tmp;
spin_lock(&player->irq_lock);
if (!player->substream)
goto irq_spin_unlock;
snd_pcm_stream_lock(player->substream);
if (player->state == UNIPERIF_STATE_STOPPED)
goto stream_unlock;
/* Get interrupt status & clear them immediately */
status = GET_UNIPERIF_ITS(player);
SET_UNIPERIF_ITS_BCLR(player, status);
/* Check for fifo error (underrun) */
if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(player))) {
dev_err(player->dev, "FIFO underflow error detected\n");
/* Interrupt is just for information when underflow recovery */
if (player->underflow_enabled) {
/* Update state to underflow */
player->state = UNIPERIF_STATE_UNDERFLOW;
} else {
/* Disable interrupt so doesn't continually fire */
SET_UNIPERIF_ITM_BCLR_FIFO_ERROR(player);
/* Stop the player */
snd_pcm_stop_xrun(player->substream);
}
ret = IRQ_HANDLED;
}
/* Check for dma error (overrun) */
if (unlikely(status & UNIPERIF_ITS_DMA_ERROR_MASK(player))) {
dev_err(player->dev, "DMA error detected\n");
/* Disable interrupt so doesn't continually fire */
SET_UNIPERIF_ITM_BCLR_DMA_ERROR(player);
/* Stop the player */
snd_pcm_stop_xrun(player->substream);
ret = IRQ_HANDLED;
}
/* Check for underflow recovery done */
if (unlikely(status & UNIPERIF_ITM_UNDERFLOW_REC_DONE_MASK(player))) {
if (!player->underflow_enabled) {
dev_err(player->dev,
"unexpected Underflow recovering\n");
ret = -EPERM;
goto stream_unlock;
}
/* Read the underflow recovery duration */
tmp = GET_UNIPERIF_STATUS_1_UNDERFLOW_DURATION(player);
dev_dbg(player->dev, "Underflow recovered (%d LR clocks max)\n",
tmp);
/* Clear the underflow recovery duration */
SET_UNIPERIF_BIT_CONTROL_CLR_UNDERFLOW_DURATION(player);
/* Update state to started */
player->state = UNIPERIF_STATE_STARTED;
ret = IRQ_HANDLED;
}
/* Check if underflow recovery failed */
if (unlikely(status &
UNIPERIF_ITM_UNDERFLOW_REC_FAILED_MASK(player))) {
dev_err(player->dev, "Underflow recovery failed\n");
/* Stop the player */
snd_pcm_stop_xrun(player->substream