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linux/sound/soc/fsl/fsl_sai.c
Mihai Serban e75f4940e8
ASoC: fsl_sai: Fix noise when using EDMA 
EDMA requires the period size to be multiple of maxburst. Otherwise the
remaining bytes are not transferred and thus noise is produced.

We can handle this issue by adding a constraint on
SNDRV_PCM_HW_PARAM_PERIOD_SIZE to be multiple of tx/rx maxburst value.

Signed-off-by: Mihai Serban <mihai.serban@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/20190913192807.8423-2-daniel.baluta@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-09-17 16:56:19 +01:00

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// SPDX-License-Identifier: GPL-2.0+
//
// Freescale ALSA SoC Digital Audio Interface (SAI) driver.
//
// Copyright 2012-2015 Freescale Semiconductor, Inc.
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include "fsl_sai.h"
#include "imx-pcm.h"
#define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
FSL_SAI_CSR_FEIE)
static const unsigned int fsl_sai_rates[] = {
8000, 11025, 12000, 16000, 22050,
24000, 32000, 44100, 48000, 64000,
88200, 96000, 176400, 192000
};
static const struct snd_pcm_hw_constraint_list fsl_sai_rate_constraints = {
.count = ARRAY_SIZE(fsl_sai_rates),
.list = fsl_sai_rates,
};
static irqreturn_t fsl_sai_isr(int irq, void *devid)
{
struct fsl_sai *sai = (struct fsl_sai *)devid;
unsigned int ofs = sai->soc_data->reg_offset;
struct device *dev = &sai->pdev->dev;
u32 flags, xcsr, mask;
bool irq_none = true;
/*
* Both IRQ status bits and IRQ mask bits are in the xCSR but
* different shifts. And we here create a mask only for those
* IRQs that we activated.
*/
mask = (FSL_SAI_FLAGS >> FSL_SAI_CSR_xIE_SHIFT) << FSL_SAI_CSR_xF_SHIFT;
/* Tx IRQ */
regmap_read(sai->regmap, FSL_SAI_TCSR(ofs), &xcsr);
flags = xcsr & mask;
if (flags)
irq_none = false;
else
goto irq_rx;
if (flags & FSL_SAI_CSR_WSF)
dev_dbg(dev, "isr: Start of Tx word detected\n");
if (flags & FSL_SAI_CSR_SEF)
dev_dbg(dev, "isr: Tx Frame sync error detected\n");
if (flags & FSL_SAI_CSR_FEF) {
dev_dbg(dev, "isr: Transmit underrun detected\n");
/* FIFO reset for safety */
xcsr |= FSL_SAI_CSR_FR;
}
if (flags & FSL_SAI_CSR_FWF)
dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");
if (flags & FSL_SAI_CSR_FRF)
dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n");
flags &= FSL_SAI_CSR_xF_W_MASK;
xcsr &= ~FSL_SAI_CSR_xF_MASK;
if (flags)
regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), flags | xcsr);
irq_rx:
/* Rx IRQ */
regmap_read(sai->regmap, FSL_SAI_RCSR(ofs), &xcsr);
flags = xcsr & mask;
if (flags)
irq_none = false;
else
goto out;
if (flags & FSL_SAI_CSR_WSF)
dev_dbg(dev, "isr: Start of Rx word detected\n");
if (flags & FSL_SAI_CSR_SEF)
dev_dbg(dev, "isr: Rx Frame sync error detected\n");
if (flags & FSL_SAI_CSR_FEF) {
dev_dbg(dev, "isr: Receive overflow detected\n");
/* FIFO reset for safety */
xcsr |= FSL_SAI_CSR_FR;
}
if (flags & FSL_SAI_CSR_FWF)
dev_dbg(dev, "isr: Enabled receive FIFO is full\n");
if (flags & FSL_SAI_CSR_FRF)
dev_dbg(dev, "isr: Receive FIFO watermark has been reached\n");
flags &= FSL_SAI_CSR_xF_W_MASK;
xcsr &= ~FSL_SAI_CSR_xF_MASK;
if (flags)
regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), flags | xcsr);
out:
if (irq_none)
return IRQ_NONE;
else
return IRQ_HANDLED;
}
static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
u32 rx_mask, int slots, int slot_width)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
sai->slots = slots;
sai->slot_width = slot_width;
return 0;
}
static int fsl_sai_set_dai_bclk_ratio(struct snd_soc_dai *dai,
unsigned int ratio)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
sai->bclk_ratio = ratio;
return 0;
}
static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int fsl_dir)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
unsigned int ofs = sai->soc_data->reg_offset;
bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
u32 val_cr2 = 0;
switch (clk_id) {
case FSL_SAI_CLK_BUS:
val_cr2 |= FSL_SAI_CR2_MSEL_BUS;
break;
case FSL_SAI_CLK_MAST1:
val_cr2 |= FSL_SAI_CR2_MSEL_MCLK1;
break;
case FSL_SAI_CLK_MAST2:
val_cr2 |= FSL_SAI_CR2_MSEL_MCLK2;
break;
case FSL_SAI_CLK_MAST3:
val_cr2 |= FSL_SAI_CR2_MSEL_MCLK3;
break;
default:
return -EINVAL;
}
regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx, ofs),
FSL_SAI_CR2_MSEL_MASK, val_cr2);
return 0;
}
static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
int ret;
if (dir == SND_SOC_CLOCK_IN)
return 0;
ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
FSL_FMT_TRANSMITTER);
if (ret) {
dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
return ret;
}
ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
FSL_FMT_RECEIVER);
if (ret)
dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);
return ret;
}
static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
unsigned int fmt, int fsl_dir)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
unsigned int ofs = sai->soc_data->reg_offset;
bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
u32 val_cr2 = 0, val_cr4 = 0;
if (!sai->is_lsb_first)
val_cr4 |= FSL_SAI_CR4_MF;
/* DAI mode */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
/*
* Frame low, 1clk before data, one word length for frame sync,
* frame sync starts one serial clock cycle earlier,
* that is, together with the last bit of the previous
* data word.
*/
val_cr2 |= FSL_SAI_CR2_BCP;
val_cr4 |= FSL_SAI_CR4_FSE | FSL_SAI_CR4_FSP;
break;
case SND_SOC_DAIFMT_LEFT_J:
/*
* Frame high, one word length for frame sync,
* frame sync asserts with the first bit of the frame.
*/
val_cr2 |= FSL_SAI_CR2_BCP;
break;
case SND_SOC_DAIFMT_DSP_A:
/*
* Frame high, 1clk before data, one bit for frame sync,
* frame sync starts one serial clock cycle earlier,
* that is, together with the last bit of the previous
* data word.
*/
val_cr2 |= FSL_SAI_CR2_BCP;
val_cr4 |= FSL_SAI_CR4_FSE;
sai->is_dsp_mode = true;
break;
case SND_SOC_DAIFMT_DSP_B:
/*
* Frame high, one bit for frame sync,
* frame sync asserts with the first bit of the frame.
*/
val_cr2 |= FSL_SAI_CR2_BCP;
sai->is_dsp_mode = true;
break;
case SND_SOC_DAIFMT_RIGHT_J:
/* To be done */
default:
return -EINVAL;
}
/* DAI clock inversion */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_IF:
/* Invert both clocks */
val_cr2 ^= FSL_SAI_CR2_BCP;
val_cr4 ^= FSL_SAI_CR4_FSP;
break;
case SND_SOC_DAIFMT_IB_NF:
/* Invert bit clock */
val_cr2 ^= FSL_SAI_CR2_BCP;
break;
case SND_SOC_DAIFMT_NB_IF:
/* Invert frame clock */
val_cr4 ^= FSL_SAI_CR4_FSP;
break;
case SND_SOC_DAIFMT_NB_NF:
/* Nothing to do for both normal cases */
break;
default:
return -EINVAL;
}
/* DAI clock master masks */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
sai->is_slave_mode = false;
break;
case SND_SOC_DAIFMT_CBM_CFM:
sai->is_slave_mode = true;
break;
case SND_SOC_DAIFMT_CBS_CFM:
val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
sai->is_slave_mode = false;
break;
case SND_SOC_DAIFMT_CBM_CFS:
val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
sai->is_slave_mode = true;
break;
default:
return -EINVAL;
}
regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx, ofs),
FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx, ofs),
FSL_SAI_CR4_MF | FSL_SAI_CR4_FSE |
FSL_SAI_CR4_FSP | FSL_SAI_CR4_FSD_MSTR, val_cr4);
return 0;
}
static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
{
int ret;
ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
if (ret) {
dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
return ret;
}
ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
if (ret)
dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);
return ret;
}
static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
unsigned int ofs = sai->soc_data->reg_offset;
unsigned long clk_rate;
u32 savediv = 0, ratio, savesub = freq;
u32 id;
int ret = 0;
/* Don't apply to slave mode */
if (sai->is_slave_mode)
return 0;
for (id = 0; id < FSL_SAI_MCLK_MAX; id++) {
clk_rate = clk_get_rate(sai->mclk_clk[id]);
if (!clk_rate)
continue;
ratio = clk_rate / freq;
ret = clk_rate - ratio * freq;
/*
* Drop the source that can not be
* divided into the required rate.
*/
if (ret != 0 && clk_rate / ret < 1000)
continue;
dev_dbg(dai->dev,
"ratio %d for freq %dHz based on clock %ldHz\n",
ratio, freq, clk_rate);
if (ratio % 2 == 0 && ratio >= 2 && ratio <= 512)
ratio /= 2;
else
continue;
if (ret < savesub) {
savediv = ratio;
sai->mclk_id[tx] = id;
savesub = ret;
}
if (ret == 0)
break;
}
if (savediv == 0) {
dev_err(dai->dev, "failed to derive required %cx rate: %d\n",
tx ? 'T' : 'R', freq);
return -EINVAL;
}
/*
* 1) For Asynchronous mode, we must set RCR2 register for capture, and
* set TCR2 register for playback.
* 2) For Tx sync with Rx clock, we must set RCR2 register for playback
* and capture.
* 3) For Rx sync with Tx clock, we must set TCR2 register for playback
* and capture.
* 4) For Tx and Rx are both Synchronous with another SAI, we just
* ignore it.
*/
if ((sai->synchronous[TX] && !sai->synchronous[RX]) ||
(!tx && !sai->synchronous[RX])) {
regmap_update_bits(sai->regmap, FSL_SAI_RCR2(ofs),
FSL_SAI_CR2_MSEL_MASK,
FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
regmap_update_bits(sai->regmap, FSL_SAI_RCR2(ofs),
FSL_SAI_CR2_DIV_MASK, savediv - 1);
} else if ((sai->synchronous[RX] && !sai->synchronous[TX]) ||
(tx && !sai->synchronous[TX])) {
regmap_update_bits(sai->regmap, FSL_SAI_TCR2(ofs),
FSL_SAI_CR2_MSEL_MASK,
FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
regmap_update_bits(sai->regmap, FSL_SAI_TCR2(ofs),
FSL_SAI_CR2_DIV_MASK, savediv - 1);
}
dev_dbg(dai->dev, "best fit: clock id=%d, div=%d, deviation =%d\n",
sai->mclk_id[tx], savediv, savesub);
return 0;
}
static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *cpu_dai)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
unsigned int ofs = sai->soc_data->reg_offset;
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
unsigned int channels = params_channels(params);
u32 word_width = params_width(params);
u32 val_cr4 = 0, val_cr5 = 0;
u32 slots = (channels == 1) ? 2 : channels;
u32 slot_width = word_width;
int ret;
if (sai->slots)
slots = sai->slots;
if (sai->slot_width)
slot_width = sai->slot_width;
if (!sai->is_slave_mode) {
if (sai->bclk_ratio)
ret = fsl_sai_set_bclk(cpu_dai, tx,
sai->bclk_ratio *
params_rate(params));
else
ret = fsl_sai_set_bclk(cpu_dai, tx,
slots * slot_width *
params_rate(params));
if (ret)
return ret;
/* Do not enable the clock if it is already enabled */
if (!(sai->mclk_streams & BIT(substream->stream))) {
ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[tx]]);
if (ret)
return ret;
sai->mclk_streams |= BIT(substream->stream);
}
}
if (!sai->is_dsp_mode)
val_cr4 |= FSL_SAI_CR4_SYWD(slot_width);
val_cr5 |= FSL_SAI_CR5_WNW(slot_width);
val_cr5 |= FSL_SAI_CR5_W0W(slot_width);
if (sai->is_lsb_first)
val_cr5 |= FSL_SAI_CR5_FBT(0);
else
val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);
val_cr4 |= FSL_SAI_CR4_FRSZ(slots);
/*
* For SAI master mode, when Tx(Rx) sync with Rx(Tx) clock, Rx(Tx) will
* generate bclk and frame clock for Tx(Rx), we should set RCR4(TCR4),
* RCR5(TCR5) and RMR(TMR) for playback(capture), or there will be sync
* error.
*/
if (!sai->is_slave_mode) {
if (!sai->synchronous[TX] && sai->synchronous[RX] && !tx) {
regmap_update_bits(sai->regmap, FSL_SAI_TCR4(ofs),
FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
val_cr4);
regmap_update_bits(sai->regmap, FSL_SAI_TCR5(ofs),
FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
FSL_SAI_CR5_FBT_MASK, val_cr5);
regmap_write(sai->regmap, FSL_SAI_TMR,
~0UL - ((1 << channels) - 1));
} else if (!sai->synchronous[RX] && sai->synchronous[TX] && tx) {
regmap_update_bits(sai->regmap, FSL_SAI_RCR4(ofs),
FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
val_cr4);
regmap_update_bits(sai->regmap, FSL_SAI_RCR5(ofs),
FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
FSL_SAI_CR5_FBT_MASK, val_cr5);
regmap_write(sai->regmap, FSL_SAI_RMR,
~0UL - ((1 << channels) - 1));
}
}
regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx, ofs),
FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
val_cr4);
regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx, ofs),
FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
FSL_SAI_CR5_FBT_MASK, val_cr5);
regmap_write(sai->regmap, FSL_SAI_xMR(tx), ~0UL - ((1 << channels) - 1));
return 0;
}
static int fsl_sai_hw_free(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
if (!sai->is_slave_mode &&
sai->mclk_streams & BIT(substream->stream)) {
clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[tx]]);
sai->mclk_streams &= ~BIT(substream->stream);
}
return 0;
}
static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *cpu_dai)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
unsigned int ofs = sai->soc_data->reg_offset;
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
u32 xcsr, count = 100;
/*
* Asynchronous mode: Clear SYNC for both Tx and Rx.
* Rx sync with Tx clocks: Clear SYNC for Tx, set it for Rx.
* Tx sync with Rx clocks: Clear SYNC for Rx, set it for Tx.
*/
regmap_update_bits(sai->regmap, FSL_SAI_TCR2(ofs), FSL_SAI_CR2_SYNC,
sai->synchronous[TX] ? FSL_SAI_CR2_SYNC : 0);
regmap_update_bits(sai->regmap, FSL_SAI_RCR2(ofs), FSL_SAI_CR2_SYNC,
sai->synchronous[RX] ? FSL_SAI_CR2_SYNC : 0);
/*
* It is recommended that the transmitter is the last enabled
* and the first disabled.
*/
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
regmap_update_bits(sai->regmap, FSL_SAI_RCSR(ofs),
FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
regmap_update_bits(sai->regmap, FSL_SAI_TCSR(ofs),
FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
FSL_SAI_CSR_FRDE, 0);
regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx, ofs),
FSL_SAI_CSR_xIE_MASK, 0);
/* Check if the opposite FRDE is also disabled */
regmap_read(sai->regmap, FSL_SAI_xCSR(!tx, ofs), &xcsr);
if (!(xcsr & FSL_SAI_CSR_FRDE)) {
/* Disable both directions and reset their FIFOs */
regmap_update_bits(sai->regmap, FSL_SAI_TCSR(ofs),
FSL_SAI_CSR_TERE, 0);
regmap_update_bits(sai->regmap, FSL_SAI_RCSR(ofs),
FSL_SAI_CSR_TERE, 0);
/* TERE will remain set till the end of current frame */
do {
udelay(10);
regmap_read(sai->regmap,
FSL_SAI_xCSR(tx, ofs), &xcsr);
} while (--count && xcsr & FSL_SAI_CSR_TERE);
regmap_update_bits(sai->regmap, FSL_SAI_TCSR(ofs),
FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
regmap_update_bits(sai->regmap, FSL_SAI_RCSR(ofs),
FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
/*
* For sai master mode, after several open/close sai,
* there will be no frame clock, and can't recover
* anymore. Add software reset to fix this issue.
* This is a hardware bug, and will be fix in the
* next sai version.
*/
if (!sai->is_slave_mode) {
/* Software Reset for both Tx and Rx */
regmap_write(sai->regmap, FSL_SAI_TCSR(ofs),
FSL_SAI_CSR_SR);
regmap_write(sai->regmap, FSL_SAI_RCSR(ofs),
FSL_SAI_CSR_SR);
/* Clear SR bit to finish the reset */
regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), 0);
regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), 0);
}
}
break;
default:
return -EINVAL;
}
return 0;
}
static int fsl_sai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
unsigned int ofs = sai->soc_data->reg_offset;
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
int ret;
regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx, ofs),
FSL_SAI_CR3_TRCE_MASK,
FSL_SAI_CR3_TRCE);
/*
* EDMA controller needs period size to be a multiple of
* tx/rx maxburst
*/
if (sai->soc_data->use_edma)
snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
tx ? sai->dma_params_tx.maxburst :
sai->dma_params_rx.maxburst);
ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE, &fsl_sai_rate_constraints);
return ret;
}
static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
unsigned int ofs = sai->soc_data->reg_offset;
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx, ofs),
FSL_SAI_CR3_TRCE_MASK, 0);
}
static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
.set_bclk_ratio = fsl_sai_set_dai_bclk_ratio,
.set_sysclk = fsl_sai_set_dai_sysclk,
.set_fmt = fsl_sai_set_dai_fmt,
.set_tdm_slot = fsl_sai_set_dai_tdm_slot,
.hw_params = fsl_sai_hw_params,
.hw_free = fsl_sai_hw_free,
.trigger = fsl_sai_trigger,
.startup = fsl_sai_startup,
.shutdown = fsl_sai_shutdown,
};
static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
{
struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
unsigned int ofs = sai->soc_data->reg_offset;
/* Software Reset for both Tx and Rx */
regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), FSL_SAI_CSR_SR);
regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), FSL_SAI_CSR_SR);
/* Clear SR bit to finish the reset */
regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), 0);
regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), 0);
regmap_update_bits(sai->regmap, FSL_SAI_TCR1(ofs),
FSL_SAI_CR1_RFW_MASK,
sai->soc_data->fifo_depth - FSL_SAI_MAXBURST_TX);
regmap_update_bits(sai->regmap, FSL_SAI_RCR1(ofs),
FSL_SAI_CR1_RFW_MASK, FSL_SAI_MAXBURST_RX - 1);
snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
&sai->dma_params_rx);
snd_soc_dai_set_drvdata(cpu_dai, sai);
return 0;
}
static struct snd_soc_dai_driver fsl_sai_dai = {
.probe = fsl_sai_dai_probe,
.playback = {
.stream_name = "CPU-Playback",
.channels_min = 1,
.channels_max = 32,
.rate_min = 8000,
.rate_max = 192000,
.rates = SNDRV_PCM_RATE_KNOT,
.formats = FSL_SAI_FORMATS,
},
.capture = {
.stream_name = "CPU-Capture",
.channels_min = 1,
.channels_max = 32,
.rate_min = 8000,
.rate_max = 192000,
.rates = SNDRV_PCM_RATE_KNOT,
.formats = FSL_SAI_FORMATS,
},
.ops = &fsl_sai_pcm_dai_ops,
};
static const struct snd_soc_component_driver fsl_component = {
.name = "fsl-sai",
};
static struct reg_default fsl_sai_reg_defaults_ofs0[] = {
{FSL_SAI_TCR1(0), 0},
{FSL_SAI_TCR2(0), 0},
{FSL_SAI_TCR3(0), 0},
{FSL_SAI_TCR4(0), 0},
{FSL_SAI_TCR5(0), 0},
{FSL_SAI_TDR0, 0},
{FSL_SAI_TDR1, 0},
{FSL_SAI_TDR2, 0},
{FSL_SAI_TDR3, 0},
{FSL_SAI_TDR4, 0},
{FSL_SAI_TDR5, 0},
{FSL_SAI_TDR6, 0},
{FSL_SAI_TDR7, 0},
{FSL_SAI_TMR, 0},
{FSL_SAI_RCR1(0), 0},
{FSL_SAI_RCR2(0), 0},
{FSL_SAI_RCR3(0), 0},
{FSL_SAI_RCR4(0), 0},
{FSL_SAI_RCR5(0), 0},
{FSL_SAI_RMR, 0},
};
static struct reg_default fsl_sai_reg_defaults_ofs8[] = {
{FSL_SAI_TCR1(8), 0},
{FSL_SAI_TCR2(8), 0},
{FSL_SAI_TCR3(8), 0},
{FSL_SAI_TCR4(8), 0},
{FSL_SAI_TCR5(8), 0},
{FSL_SAI_TDR0, 0},
{FSL_SAI_TDR1, 0},
{FSL_SAI_TDR2, 0},
{FSL_SAI_TDR3, 0},
{FSL_SAI_TDR4, 0},
{FSL_SAI_TDR5, 0},
{FSL_SAI_TDR6, 0},
{FSL_SAI_TDR7, 0},
{FSL_SAI_TMR, 0},
{FSL_SAI_RCR1(8), 0},
{FSL_SAI_RCR2(8), 0},
{FSL_SAI_RCR3(8), 0},
{FSL_SAI_RCR4(8), 0},
{FSL_SAI_RCR5(8), 0},
{FSL_SAI_RMR, 0},
};
static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
unsigned int ofs = sai->soc_data->reg_offset;
if (reg >= FSL_SAI_TCSR(ofs) && reg <= FSL_SAI_TCR5(ofs))
return true;
if (reg >= FSL_SAI_RCSR(ofs) && reg <= FSL_SAI_RCR5(ofs))
return true;
switch (reg) {
case FSL_SAI_TFR0:
case FSL_SAI_TFR1:
case FSL_SAI_TFR2:
case FSL_SAI_TFR3:
case FSL_SAI_TFR4:
case FSL_SAI_TFR5:
case FSL_SAI_TFR6:
case FSL_SAI_TFR7:
case FSL_SAI_TMR:
case FSL_SAI_RDR0:
case FSL_SAI_RDR1:
case FSL_SAI_RDR2:
case FSL_SAI_RDR3:
case FSL_SAI_RDR4:
case FSL_SAI_RDR5:
case FSL_SAI_RDR6:
case FSL_SAI_RDR7:
case FSL_SAI_RFR0:
case FSL_SAI_RFR1:
case FSL_SAI_RFR2:
case FSL_SAI_RFR3:
case FSL_SAI_RFR4:
case FSL_SAI_RFR5:
case FSL_SAI_RFR6:
case FSL_SAI_RFR7:
case FSL_SAI_RMR:
return true;
default:
return false;
}
}
static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
unsigned int ofs = sai->soc_data->reg_offset;
if (reg == FSL_SAI_TCSR(ofs) || reg == FSL_SAI_RCSR(ofs))
return true;
switch (reg) {
case FSL_SAI_TFR0:
case FSL_SAI_TFR1:
case FSL_SAI_TFR2:
case FSL_SAI_TFR3:
case FSL_SAI_TFR4:
case FSL_SAI_TFR5:
case FSL_SAI_TFR6:
case FSL_SAI_TFR7:
case FSL_SAI_RFR0:
case FSL_SAI_RFR1:
case FSL_SAI_RFR2:
case FSL_SAI_RFR3:
case FSL_SAI_RFR4:
case FSL_SAI_RFR5:
case FSL_SAI_RFR6:
case FSL_SAI_RFR7:
case FSL_SAI_RDR0:
case FSL_SAI_RDR1:
case FSL_SAI_RDR2:
case FSL_SAI_RDR3:
case FSL_SAI_RDR4:
case FSL_SAI_RDR5:
case FSL_SAI_RDR6:
case FSL_SAI_RDR7:
return true;
default:
return false;
}
}
static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
unsigned int ofs = sai->soc_data->reg_offset;
if (reg >= FSL_SAI_TCSR(ofs) && reg <= FSL_SAI_TCR5(ofs))
return true;
if (reg >= FSL_SAI_RCSR(ofs) && reg <= FSL_SAI_RCR5(ofs))
return true;
switch (reg) {
case FSL_SAI_TDR0:
case FSL_SAI_TDR1:
case FSL_SAI_TDR2:
case FSL_SAI_TDR3:
case FSL_SAI_TDR4:
case FSL_SAI_TDR5:
case FSL_SAI_TDR6:
case FSL_SAI_TDR7:
case FSL_SAI_TMR:
case FSL_SAI_RMR:
return true;
default:
return false;
}
}
static struct regmap_config fsl_sai_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.fast_io = true,
.max_register = FSL_SAI_RMR,
.reg_defaults = fsl_sai_reg_defaults_ofs0,
.num_reg_defaults = ARRAY_SIZE(fsl_sai_reg_defaults_ofs0),
.readable_reg = fsl_sai_readable_reg,
.volatile_reg = fsl_sai_volatile_reg,
.writeable_reg = fsl_sai_writeable_reg,
.cache_type = REGCACHE_FLAT,
};
static int fsl_sai_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct fsl_sai *sai;
struct regmap *gpr;
struct resource *res;
void __iomem *base;
char tmp[8];
int irq, ret, i;
int index;
sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
if (!sai)
return -ENOMEM;
sai->pdev = pdev;
sai->soc_data = of_device_get_match_data(&pdev->dev);
sai->is_lsb_first = of_property_read_bool(np, "lsb-first");
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
if (sai->soc_data->reg_offset == 8) {
fsl_sai_regmap_config.reg_defaults = fsl_sai_reg_defaults_ofs8;
fsl_sai_regmap_config.num_reg_defaults =
ARRAY_SIZE(fsl_sai_reg_defaults_ofs8);
}
sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
"bus", base, &fsl_sai_regmap_config);
/* Compatible with old DTB cases */
if (IS_ERR(sai->regmap))
sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
"sai", base, &fsl_sai_regmap_config);
if (IS_ERR(sai->regmap)) {
dev_err(&pdev->dev, "regmap init failed\n");
return PTR_ERR(sai->regmap);
}
/* No error out for old DTB cases but only mark the clock NULL */
sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
if (IS_ERR(sai->bus_clk)) {
dev_err(&pdev->dev, "failed to get bus clock: %ld\n",
PTR_ERR(sai->bus_clk));
sai->bus_clk = NULL;
}
sai->mclk_clk[0] = sai->bus_clk;
for (i = 1; i < FSL_SAI_MCLK_MAX; i++) {
sprintf(tmp, "mclk%d", i);
sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
if (IS_ERR(sai->mclk_clk[i])) {
dev_err(&pdev->dev, "failed to get mclk%d clock: %ld\n",
i + 1, PTR_ERR(sai->mclk_clk[i]));
sai->mclk_clk[i] = NULL;
}
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, 0, np->name, sai);
if (ret) {
dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
return ret;
}
/* Sync Tx with Rx as default by following old DT binding */
sai->synchronous[RX] = true;
sai->synchronous[TX] = false;
fsl_sai_dai.symmetric_rates = 1;
fsl_sai_dai.symmetric_channels = 1;
fsl_sai_dai.symmetric_samplebits = 1;
if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) &&
of_find_property(np, "fsl,sai-asynchronous", NULL)) {
/* error out if both synchronous and asynchronous are present */
dev_err(&pdev->dev, "invalid binding for synchronous mode\n");
return -EINVAL;
}
if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) {
/* Sync Rx with Tx */
sai->synchronous[RX] = false;
sai->synchronous[TX] = true;
} else if (of_find_property(np, "fsl,sai-asynchronous", NULL)) {
/* Discard all settings for asynchronous mode */
sai->synchronous[RX] = false;
sai->synchronous[TX] = false;
fsl_sai_dai.symmetric_rates = 0;
fsl_sai_dai.symmetric_channels = 0;
fsl_sai_dai.symmetric_samplebits = 0;
}
if (of_find_property(np, "fsl,sai-mclk-direction-output", NULL) &&
of_device_is_compatible(np, "fsl,imx6ul-sai")) {
gpr = syscon_regmap_lookup_by_compatible("fsl,imx6ul-iomuxc-gpr");
if (IS_ERR(gpr)) {
dev_err(&pdev->dev, "cannot find iomuxc registers\n");
return PTR_ERR(gpr);
}
index = of_alias_get_id(np, "sai");
if (index < 0)
return index;
regmap_update_bits(gpr, IOMUXC_GPR1, MCLK_DIR(index),
MCLK_DIR(index));
}
sai->dma_params_rx.addr = res->start + FSL_SAI_RDR0;
sai->dma_params_tx.addr = res->start + FSL_SAI_TDR0;
sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;
platform_set_drvdata(pdev, sai);
pm_runtime_enable(&pdev->dev);
ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
&fsl_sai_dai, 1);
if (ret)
return ret;
if (sai->soc_data->use_imx_pcm)
return imx_pcm_dma_init(pdev, IMX_SAI_DMABUF_SIZE);
else
return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
}
static int fsl_sai_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
return 0;
}
static const struct fsl_sai_soc_data fsl_sai_vf610_data = {
.use_imx_pcm = false,
.use_edma = false,
.fifo_depth = 32,
.reg_offset = 0,
};
static const struct fsl_sai_soc_data fsl_sai_imx6sx_data = {
.use_imx_pcm = true,
.use_edma = false,
.fifo_depth = 32,
.reg_offset = 0,
};
static const struct fsl_sai_soc_data fsl_sai_imx7ulp_data = {
.use_imx_pcm = true,
.use_edma = false,
.fifo_depth = 16,
.reg_offset = 8,
};
static const struct fsl_sai_soc_data fsl_sai_imx8mq_data = {
.use_imx_pcm = true,
.use_edma = false,
.fifo_depth = 128,
.reg_offset = 8,
};
static const struct fsl_sai_soc_data fsl_sai_imx8qm_data = {
.use_imx_pcm = true,
.use_edma = true,
.fifo_depth = 64,
.reg_offset = 0,
};
static const struct of_device_id fsl_sai_ids[] = {
{ .compatible = "fsl,vf610-sai", .data = &fsl_sai_vf610_data },
{ .compatible = "fsl,imx6sx-sai", .data = &fsl_sai_imx6sx_data },
{ .compatible = "fsl,imx6ul-sai", .data = &fsl_sai_imx6sx_data },
{ .compatible = "fsl,imx7ulp-sai", .data = &fsl_sai_imx7ulp_data },
{ .compatible = "fsl,imx8mq-sai", .data = &fsl_sai_imx8mq_data },
{ .compatible = "fsl,imx8qm-sai", .data = &fsl_sai_imx8qm_data },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_sai_ids);
#ifdef CONFIG_PM
static int fsl_sai_runtime_suspend(struct device *dev)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE))
clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);
if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK))
clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[1]]);
clk_disable_unprepare(sai->bus_clk);
regcache_cache_only(sai->regmap, true);
regcache_mark_dirty(sai->regmap);
return 0;
}
static int fsl_sai_runtime_resume(struct device *dev)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
unsigned int ofs = sai->soc_data->reg_offset;
int ret;
ret = clk_prepare_enable(sai->bus_clk);
if (ret) {
dev_err(dev, "failed to enable bus clock: %d\n", ret);
return ret;
}
if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK)) {
ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[1]]);
if (ret)
goto disable_bus_clk;
}
if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE)) {
ret = clk_prepare_enable(sai->mclk_clk[sai->mclk_id[0]]);
if (ret)
goto disable_tx_clk;
}
regcache_cache_only(sai->regmap, false);
regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), FSL_SAI_CSR_SR);
regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), FSL_SAI_CSR_SR);
usleep_range(1000, 2000);
regmap_write(sai->regmap, FSL_SAI_TCSR(ofs), 0);
regmap_write(sai->regmap, FSL_SAI_RCSR(ofs), 0);
ret = regcache_sync(sai->regmap);
if (ret)
goto disable_rx_clk;
return 0;
disable_rx_clk:
if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_CAPTURE))
clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[0]]);
disable_tx_clk:
if (sai->mclk_streams & BIT(SNDRV_PCM_STREAM_PLAYBACK))
clk_disable_unprepare(sai->mclk_clk[sai->mclk_id[1]]);
disable_bus_clk:
clk_disable_unprepare(sai->bus_clk);
return ret;
}
#endif /* CONFIG_PM */
static const struct dev_pm_ops fsl_sai_pm_ops = {
SET_RUNTIME_PM_OPS(fsl_sai_runtime_suspend,
fsl_sai_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static struct platform_driver fsl_sai_driver = {
.probe = fsl_sai_probe,
.remove = fsl_sai_remove,
.driver = {
.name = "fsl-sai",
.pm = &fsl_sai_pm_ops,
.of_match_table = fsl_sai_ids,
},
};
module_platform_driver(fsl_sai_driver);
MODULE_DESCRIPTION("Freescale Soc SAI Interface");
MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
MODULE_ALIAS("platform:fsl-sai");
MODULE_LICENSE("GPL");
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