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linux/sound/soc/fsl/fsl_sai.c
Fabio Estevam 4d2458507d ASoC: fsl_sai: Allow setting the SAI MCLK direction 
On mx6ul the General Purpose Register 1 (GPR1) contains the following
bits for configuring the direction of the SAI MCLKs:
SAI1_MCLK_DIR, SAI2_MCLK_DIR, SAI3_MCLK_DIR

Introduce  the "fsl,sai-mclk-direction-output" optional property to allow
configuring the SAI_MCLK outputs.

Tested on a imx6ul-evk board.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-05-05 16:44:22 +01:00

970 lines
25 KiB
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/*
* Freescale ALSA SoC Digital Audio Interface (SAI) driver.
*
* Copyright 2012-2015 Freescale Semiconductor, Inc.
*
* This program is free software, you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 2 of the License, or(at your
* option) any later version.
*
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of_address.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;
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, &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_warn(dev, "isr: Tx Frame sync error detected\n");
if (flags & FSL_SAI_CSR_FEF) {
dev_warn(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, flags | xcsr);
irq_rx:
/* Rx IRQ */
regmap_read(sai->regmap, FSL_SAI_RCSR, &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_warn(dev, "isr: Rx Frame sync error detected\n");
if (flags & FSL_SAI_CSR_FEF) {
dev_warn(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, 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_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);
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),
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);
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;
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;
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),
FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
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 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,
FSL_SAI_CR2_MSEL_MASK,
FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
regmap_update_bits(sai->regmap, FSL_SAI_RCR2,
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,
FSL_SAI_CR2_MSEL_MASK,
FSL_SAI_CR2_MSEL(sai->mclk_id[tx]));
regmap_update_bits(sai->regmap, FSL_SAI_TCR2,
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);
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) {
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,
FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
val_cr4);
regmap_update_bits(sai->regmap, FSL_SAI_TCR5,
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,
FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
val_cr4);
regmap_update_bits(sai->regmap, FSL_SAI_RCR5,
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),
FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
val_cr4);
regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx),
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);
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, FSL_SAI_CR2_SYNC,
sai->synchronous[TX] ? FSL_SAI_CR2_SYNC : 0);
regmap_update_bits(sai->regmap, FSL_SAI_RCR2, 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),
FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
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),
FSL_SAI_CSR_FRDE, 0);
regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
FSL_SAI_CSR_xIE_MASK, 0);
/* Check if the opposite FRDE is also disabled */
regmap_read(sai->regmap, FSL_SAI_xCSR(!tx), &xcsr);
if (!(xcsr & FSL_SAI_CSR_FRDE)) {
/* Disable both directions and reset their FIFOs */
regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
FSL_SAI_CSR_TERE, 0);
regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
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), &xcsr);
} while (--count && xcsr & FSL_SAI_CSR_TERE);
regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
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, FSL_SAI_CSR_SR);
regmap_write(sai->regmap,
FSL_SAI_RCSR, FSL_SAI_CSR_SR);
/* Clear SR bit to finish the reset */
regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
regmap_write(sai->regmap, FSL_SAI_RCSR, 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);
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
struct device *dev = &sai->pdev->dev;
int ret;
ret = clk_prepare_enable(sai->bus_clk);
if (ret) {
dev_err(dev, "failed to enable bus clock: %d\n", ret);
return ret;
}
regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
FSL_SAI_CR3_TRCE);
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);
bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE, 0);
clk_disable_unprepare(sai->bus_clk);
}
static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
.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);
/* Software Reset for both Tx and Rx */
regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
/* Clear SR bit to finish the reset */
regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK,
FSL_SAI_MAXBURST_TX * 2);
regmap_update_bits(sai->regmap, FSL_SAI_RCR1, 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 = 2,
.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 = 2,
.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[] = {
{FSL_SAI_TCR1, 0},
{FSL_SAI_TCR2, 0},
{FSL_SAI_TCR3, 0},
{FSL_SAI_TCR4, 0},
{FSL_SAI_TCR5, 0},
{FSL_SAI_TDR, 0},
{FSL_SAI_TMR, 0},
{FSL_SAI_RCR1, 0},
{FSL_SAI_RCR2, 0},
{FSL_SAI_RCR3, 0},
{FSL_SAI_RCR4, 0},
{FSL_SAI_RCR5, 0},
{FSL_SAI_RMR, 0},
};
static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case FSL_SAI_TCSR:
case FSL_SAI_TCR1:
case FSL_SAI_TCR2:
case FSL_SAI_TCR3:
case FSL_SAI_TCR4:
case FSL_SAI_TCR5:
case FSL_SAI_TFR:
case FSL_SAI_TMR:
case FSL_SAI_RCSR:
case FSL_SAI_RCR1:
case FSL_SAI_RCR2:
case FSL_SAI_RCR3:
case FSL_SAI_RCR4:
case FSL_SAI_RCR5:
case FSL_SAI_RDR:
case FSL_SAI_RFR:
case FSL_SAI_RMR:
return true;
default:
return false;
}
}
static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case FSL_SAI_TCSR:
case FSL_SAI_RCSR:
case FSL_SAI_TFR:
case FSL_SAI_RFR:
case FSL_SAI_RDR:
return true;
default:
return false;
}
}
static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case FSL_SAI_TCSR:
case FSL_SAI_TCR1:
case FSL_SAI_TCR2:
case FSL_SAI_TCR3:
case FSL_SAI_TCR4:
case FSL_SAI_TCR5:
case FSL_SAI_TDR:
case FSL_SAI_TMR:
case FSL_SAI_RCSR:
case FSL_SAI_RCR1:
case FSL_SAI_RCR2:
case FSL_SAI_RCR3:
case FSL_SAI_RCR4:
case FSL_SAI_RCR5:
case FSL_SAI_RMR:
return true;
default:
return false;
}
}
static const struct regmap_config fsl_sai_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = FSL_SAI_RMR,
.reg_defaults = fsl_sai_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(fsl_sai_reg_defaults),
.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;
if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai") ||
of_device_is_compatible(pdev->dev.of_node, "fsl,imx6ul-sai"))
sai->sai_on_imx = true;
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);
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) {
dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
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(pdev->dev.of_node, "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_RDR;
sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;
platform_set_drvdata(pdev, sai);
ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
&fsl_sai_dai, 1);
if (ret)
return ret;
if (sai->sai_on_imx)
return imx_pcm_dma_init(pdev, IMX_SAI_DMABUF_SIZE);
else
return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
}
static const struct of_device_id fsl_sai_ids[] = {
{ .compatible = "fsl,vf610-sai", },
{ .compatible = "fsl,imx6sx-sai", },
{ .compatible = "fsl,imx6ul-sai", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_sai_ids);
#ifdef CONFIG_PM_SLEEP
static int fsl_sai_suspend(struct device *dev)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
regcache_cache_only(sai->regmap, true);
regcache_mark_dirty(sai->regmap);
return 0;
}
static int fsl_sai_resume(struct device *dev)
{
struct fsl_sai *sai = dev_get_drvdata(dev);
regcache_cache_only(sai->regmap, false);
regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
usleep_range(1000, 2000);
regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
regmap_write(sai->regmap, FSL_SAI_RCSR, 0);
return regcache_sync(sai->regmap);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops fsl_sai_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(fsl_sai_suspend, fsl_sai_resume)
};
static struct platform_driver fsl_sai_driver = {
.probe = fsl_sai_probe,
.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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