Linux Kernel iMX6
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/*
* Freescale ASRC ALSA SoC Digital Audio Interface (DAI) driver
*
* Copyright (C) 2014-2015 Freescale Semiconductor, Inc.
*
* Author: Nicolin Chen <nicoleotsuka@gmail.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_data/dma-imx.h>
#include <linux/pm_runtime.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include "fsl_asrc.h"
#define IDEAL_RATIO_DECIMAL_DEPTH 26
#define pair_err(fmt, ...) \
dev_err(&asrc_priv->pdev->dev, "Pair %c: " fmt, 'A' + index, ##__VA_ARGS__)
#define pair_dbg(fmt, ...) \
dev_dbg(&asrc_priv->pdev->dev, "Pair %c: " fmt, 'A' + index, ##__VA_ARGS__)
/* Sample rates are aligned with that defined in pcm.h file */
static const u8 process_option[][8][2] = {
/* 32kHz 44.1kHz 48kHz 64kHz 88.2kHz 96kHz 176kHz 192kHz */
{{0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 5512Hz */
{{0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 8kHz */
{{0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 11025Hz */
{{0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 16kHz */
{{0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},}, /* 22050Hz */
{{0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0}, {0, 0},}, /* 32kHz */
{{0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0},}, /* 44.1kHz */
{{0, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0}, {0, 0},}, /* 48kHz */
{{1, 2}, {0, 2}, {0, 2}, {0, 1}, {0, 1}, {0, 1}, {0, 1}, {0, 0},}, /* 64kHz */
{{1, 2}, {1, 2}, {1, 2}, {1, 1}, {1, 1}, {1, 1}, {1, 1}, {1, 1},}, /* 88.2kHz */
{{1, 2}, {1, 2}, {1, 2}, {1, 1}, {1, 1}, {1, 1}, {1, 1}, {1, 1},}, /* 96kHz */
{{2, 2}, {2, 2}, {2, 2}, {2, 1}, {2, 1}, {2, 1}, {2, 1}, {2, 1},}, /* 176kHz */
{{2, 2}, {2, 2}, {2, 2}, {2, 1}, {2, 1}, {2, 1}, {2, 1}, {2, 1},}, /* 192kHz */
};
/* Corresponding to process_option */
static int supported_input_rate[] = {
5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200,
96000, 176400, 192000,
};
static int supported_asrc_rate[] = {
32000, 44100, 48000, 64000, 88200, 96000, 176400, 192000,
};
/**
* The following tables map the relationship between asrc_inclk/asrc_outclk in
* fsl_asrc.h and the registers of ASRCSR
*/
static unsigned char input_clk_map_imx35[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
};
static unsigned char output_clk_map_imx35[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
};
/* i.MX53 uses the same map for input and output */
static unsigned char input_clk_map_imx53[] = {
/* 0x0 0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xa 0xb 0xc 0xd 0xe 0xf */
0x0, 0x1, 0x2, 0x7, 0x4, 0x5, 0x6, 0x3, 0x8, 0x9, 0xa, 0xb, 0xc, 0xf, 0xe, 0xd,
};
static unsigned char output_clk_map_imx53[] = {
/* 0x0 0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xa 0xb 0xc 0xd 0xe 0xf */
0x8, 0x9, 0xa, 0x7, 0xc, 0x5, 0x6, 0xb, 0x0, 0x1, 0x2, 0x3, 0x4, 0xf, 0xe, 0xd,
};
static unsigned char *clk_map[2];
/**
* Request ASRC pair
*
* It assigns pair by the order of A->C->B because allocation of pair B,
* within range [ANCA, ANCA+ANCB-1], depends on the channels of pair A
* while pair A and pair C are comparatively independent.
*/
static int fsl_asrc_request_pair(int channels, struct fsl_asrc_pair *pair)
{
enum asrc_pair_index index = ASRC_INVALID_PAIR;
struct fsl_asrc *asrc_priv = pair->asrc_priv;
struct device *dev = &asrc_priv->pdev->dev;
unsigned long lock_flags;
int i, ret = 0;
spin_lock_irqsave(&asrc_priv->lock, lock_flags);
for (i = ASRC_PAIR_A; i < ASRC_PAIR_MAX_NUM; i++) {
if (asrc_priv->pair[i] != NULL)
continue;
index = i;
if (i != ASRC_PAIR_B)
break;
}
if (index == ASRC_INVALID_PAIR) {
dev_err(dev, "all pairs are busy now\n");
ret = -EBUSY;
} else if (asrc_priv->channel_avail < channels ||
(asrc_priv->channel_bits < 4 && channels % 2 != 0)) {
dev_err(dev, "can't afford required channels: %d\n", channels);
ret = -EINVAL;
} else {
asrc_priv->channel_avail -= channels;
asrc_priv->pair[index] = pair;
pair->channels = channels;
pair->index = index;
}
spin_unlock_irqrestore(&asrc_priv->lock, lock_flags);
return ret;
}
/**
* Release ASRC pair
*
* It clears the resource from asrc_priv and releases the occupied channels.
*/
static void fsl_asrc_release_pair(struct fsl_asrc_pair *pair)
{
struct fsl_asrc *asrc_priv = pair->asrc_priv;
enum asrc_pair_index index = pair->index;
unsigned long lock_flags;
/* Make sure the pair is disabled */
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_ASRCEi_MASK(index), 0);
spin_lock_irqsave(&asrc_priv->lock, lock_flags);
asrc_priv->channel_avail += pair->channels;
asrc_priv->pair[index] = NULL;
pair->error = 0;
spin_unlock_irqrestore(&asrc_priv->lock, lock_flags);
}
/**
* Configure input and output thresholds
*/
static void fsl_asrc_set_watermarks(struct fsl_asrc_pair *pair, u32 in, u32 out)
{
struct fsl_asrc *asrc_priv = pair->asrc_priv;
enum asrc_pair_index index = pair->index;
regmap_update_bits(asrc_priv->regmap, REG_ASRMCR(index),
ASRMCRi_EXTTHRSHi_MASK |
ASRMCRi_INFIFO_THRESHOLD_MASK |
ASRMCRi_OUTFIFO_THRESHOLD_MASK,
ASRMCRi_EXTTHRSHi |
ASRMCRi_INFIFO_THRESHOLD(in) |
ASRMCRi_OUTFIFO_THRESHOLD(out));
}
/**
* Calculate the total divisor between asrck clock rate and sample rate
*
* It follows the formula clk_rate = samplerate * (2 ^ prescaler) * divider
*/
static u32 fsl_asrc_cal_asrck_divisor(struct fsl_asrc_pair *pair, u32 div)
{
u32 ps;
/* Calculate the divisors: prescaler [2^0, 2^7], divder [1, 8] */
for (ps = 0; div > 8; ps++)
div >>= 1;
return ((div - 1) << ASRCDRi_AxCPi_WIDTH) | ps;
}
/**
* Calculate and set the ratio for Ideal Ratio mode only
*
* The ratio is a 32-bit fixed point value with 26 fractional bits.
*/
static int fsl_asrc_set_ideal_ratio(struct fsl_asrc_pair *pair,
int inrate, int outrate)
{
struct fsl_asrc *asrc_priv = pair->asrc_priv;
enum asrc_pair_index index = pair->index;
unsigned long ratio;
int i;
if (!outrate) {
pair_err("output rate should not be zero\n");
return -EINVAL;
}
/* Calculate the intergal part of the ratio */
ratio = (inrate / outrate) << IDEAL_RATIO_DECIMAL_DEPTH;
/* ... and then the 26 depth decimal part */
inrate %= outrate;
for (i = 1; i <= IDEAL_RATIO_DECIMAL_DEPTH; i++) {
inrate <<= 1;
if (inrate < outrate)
continue;
ratio |= 1 << (IDEAL_RATIO_DECIMAL_DEPTH - i);
inrate -= outrate;
if (!inrate)
break;
}
regmap_write(asrc_priv->regmap, REG_ASRIDRL(index), ratio);
regmap_write(asrc_priv->regmap, REG_ASRIDRH(index), ratio >> 24);
return 0;
}
/**
* Configure the assigned ASRC pair
*
* It configures those ASRC registers according to a configuration instance
* of struct asrc_config which includes in/output sample rate, width, channel
* and clock settings.
*/
static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair, bool p2p_in, bool p2p_out)
{
struct asrc_config *config = pair->config;
struct fsl_asrc *asrc_priv = pair->asrc_priv;
enum asrc_pair_index index = pair->index;
u32 inrate, outrate, indiv, outdiv;
u32 clk_index[2], div[2];
int in, out, channels;
struct clk *clk;
bool ideal;
if (!config) {
pair_err("invalid pair config\n");
return -EINVAL;
}
/* Validate channels */
if (config->channel_num < 1 || config->channel_num > 10) {
pair_err("does not support %d channels\n", config->channel_num);
return -EINVAL;
}
/* Validate output width */
if (config->output_word_width == ASRC_WIDTH_8_BIT) {
pair_err("does not support 8bit width output\n");
return -EINVAL;
}
inrate = config->input_sample_rate;
outrate = config->output_sample_rate;
ideal = config->inclk == INCLK_NONE;
/* Validate input and output sample rates */
for (in = 0; in < ARRAY_SIZE(supported_input_rate); in++)
if (inrate == supported_input_rate[in])
break;
if (in == ARRAY_SIZE(supported_input_rate)) {
pair_err("unsupported input sample rate: %dHz\n", inrate);
return -EINVAL;
}
for (out = 0; out < ARRAY_SIZE(supported_asrc_rate); out++)
if (outrate == supported_asrc_rate[out])
break;
if (out == ARRAY_SIZE(supported_asrc_rate)) {
pair_err("unsupported output sample rate: %dHz\n", outrate);
return -EINVAL;
}
/* Validate input and output clock sources */
clk_index[IN] = clk_map[IN][config->inclk];
clk_index[OUT] = clk_map[OUT][config->outclk];
/* We only have output clock for ideal ratio mode */
clk = asrc_priv->asrck_clk[clk_index[ideal ? OUT : IN]];
div[IN] = clk_get_rate(clk) / inrate;
if (div[IN] == 0) {
pair_err("failed to support input sample rate %dHz by asrck_%x\n",
inrate, clk_index[ideal ? OUT : IN]);
return -EINVAL;
}
clk = asrc_priv->asrck_clk[clk_index[OUT]];
/*
* When P2P mode, output rate should align with the out samplerate.
* if set too high output rate, there will be lots of Overload.
* When M2M mode, output rate should also need to align with the out
* samplerate, but M2M must use less time to achieve good performance.
*/
if (p2p_out)
div[OUT] = clk_get_rate(clk) / outrate;
else
div[OUT] = clk_get_rate(clk) / IDEAL_RATIO_RATE;
if (div[OUT] == 0) {
pair_err("failed to support output sample rate %dHz by asrck_%x\n",
outrate, clk_index[OUT]);
return -EINVAL;
}
/* Set the channel number */
channels = config->channel_num;
if (asrc_priv->channel_bits < 4)
channels /= 2;
/* Update channels for current pair */
regmap_update_bits(asrc_priv->regmap, REG_ASRCNCR,
ASRCNCR_ANCi_MASK(index, asrc_priv->channel_bits),
ASRCNCR_ANCi(index, channels, asrc_priv->channel_bits));
/* Default setting: Automatic selection for processing mode */
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_ATSi_MASK(index), ASRCTR_ATS(index));
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_USRi_MASK(index), 0);
/* Set the input and output clock sources */
regmap_update_bits(asrc_priv->regmap, REG_ASRCSR,
ASRCSR_AICSi_MASK(index) | ASRCSR_AOCSi_MASK(index),
ASRCSR_AICS(index, clk_index[IN]) |
ASRCSR_AOCS(index, clk_index[OUT]));
/* Calculate the input clock divisors */
indiv = fsl_asrc_cal_asrck_divisor(pair, div[IN]);
outdiv = fsl_asrc_cal_asrck_divisor(pair, div[OUT]);
/* Suppose indiv and outdiv includes prescaler, so add its MASK too */
regmap_update_bits(asrc_priv->regmap, REG_ASRCDR(index),
ASRCDRi_AOCPi_MASK(index) | ASRCDRi_AICPi_MASK(index) |
ASRCDRi_AOCDi_MASK(index) | ASRCDRi_AICDi_MASK(index),
ASRCDRi_AOCP(index, outdiv) | ASRCDRi_AICP(index, indiv));
/* Implement word_width configurations */
regmap_update_bits(asrc_priv->regmap, REG_ASRMCR1(index),
ASRMCR1i_OW16_MASK | ASRMCR1i_IWD_MASK,
ASRMCR1i_OW16(config->output_word_width) |
ASRMCR1i_IWD(config->input_word_width));
/* Enable BUFFER STALL */
regmap_update_bits(asrc_priv->regmap, REG_ASRMCR(index),
ASRMCRi_BUFSTALLi_MASK, ASRMCRi_BUFSTALLi);
/* Set default thresholds for input and output FIFO */
fsl_asrc_set_watermarks(pair, ASRC_INPUTFIFO_THRESHOLD,
ASRC_INPUTFIFO_THRESHOLD);
/* Configure the followings only for Ideal Ratio mode */
if (!ideal)
return 0;
/* Clear ASTSx bit to use Ideal Ratio mode */
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_ATSi_MASK(index), 0);
/* Enable Ideal Ratio mode */
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_IDRi_MASK(index) | ASRCTR_USRi_MASK(index),
ASRCTR_IDR(index) | ASRCTR_USR(index));
/* Apply configurations for pre- and post-processing */
regmap_update_bits(asrc_priv->regmap, REG_ASRCFG,
ASRCFG_PREMODi_MASK(index) | ASRCFG_POSTMODi_MASK(index),
ASRCFG_PREMOD(index, process_option[in][out][0]) |
ASRCFG_POSTMOD(index, process_option[in][out][1]));
return fsl_asrc_set_ideal_ratio(pair, inrate, outrate);
}
/**
* Start the assigned ASRC pair
*
* It enables the assigned pair and makes it stopped at the stall level.
*/
static void fsl_asrc_start_pair(struct fsl_asrc_pair *pair)
{
struct fsl_asrc *asrc_priv = pair->asrc_priv;
enum asrc_pair_index index = pair->index;
int reg, retry = 10, i;
/* Enable the current pair */
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_ASRCEi_MASK(index), ASRCTR_ASRCE(index));
/* Wait for status of initialization */
do {
udelay(5);
regmap_read(asrc_priv->regmap, REG_ASRCFG, &reg);
reg &= ASRCFG_INIRQi_MASK(index);
} while (!reg && --retry);
/* Make the input fifo to ASRC STALL level */
regmap_read(asrc_priv->regmap, REG_ASRCNCR, &reg);
for (i = 0; i < pair->channels * 4; i++)
regmap_write(asrc_priv->regmap, REG_ASRDI(index), 0);
/* Enable overload interrupt */
regmap_write(asrc_priv->regmap, REG_ASRIER, ASRIER_AOLIE);
}
/**
* Stop the assigned ASRC pair
*/
static void fsl_asrc_stop_pair(struct fsl_asrc_pair *pair)
{
struct fsl_asrc *asrc_priv = pair->asrc_priv;
enum asrc_pair_index index = pair->index;
/* Stop the current pair */
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_ASRCEi_MASK(index), 0);
}
/**
* Get DMA channel according to the pair and direction.
*/
struct dma_chan *fsl_asrc_get_dma_channel(struct fsl_asrc_pair *pair, bool dir)
{
struct fsl_asrc *asrc_priv = pair->asrc_priv;
enum asrc_pair_index index = pair->index;
char name[4];
sprintf(name, "%cx%c", dir == IN ? 'r' : 't', index + 'a');
return dma_request_slave_channel(&asrc_priv->pdev->dev, name);
}
EXPORT_SYMBOL_GPL(fsl_asrc_get_dma_channel);
static int fsl_asrc_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(dai);
int width = snd_pcm_format_width(params_format(params));
struct snd_pcm_runtime *runtime = substream->runtime;
struct fsl_asrc_pair *pair = runtime->private_data;
unsigned int channels = params_channels(params);
unsigned int rate = params_rate(params);
struct asrc_config config;
int word_width, ret;
ret = fsl_asrc_request_pair(channels, pair);
if (ret) {
dev_err(dai->dev, "fail to request asrc pair\n");
return ret;
}
pair->config = &config;
if (width == 16)
width = ASRC_WIDTH_16_BIT;
else
width = ASRC_WIDTH_24_BIT;
if (asrc_priv->asrc_width == 16)
word_width = ASRC_WIDTH_16_BIT;
else
word_width = ASRC_WIDTH_24_BIT;
config.pair = pair->index;
config.channel_num = channels;
config.inclk = INCLK_NONE;
config.outclk = OUTCLK_ASRCK1_CLK;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
config.input_word_width = width;
config.output_word_width = word_width;
config.input_sample_rate = rate;
config.output_sample_rate = asrc_priv->asrc_rate;
ret = fsl_asrc_config_pair(pair, false, true);
if (ret) {
dev_err(dai->dev, "fail to config asrc pair\n");
return ret;
}
} else {
config.input_word_width = word_width;
config.output_word_width = width;
config.input_sample_rate = asrc_priv->asrc_rate;
config.output_sample_rate = rate;
ret = fsl_asrc_config_pair(pair, true, false);
if (ret) {
dev_err(dai->dev, "fail to config asrc pair\n");
return ret;
}
}
return 0;
}
static int fsl_asrc_dai_hw_free(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct fsl_asrc_pair *pair = runtime->private_data;
if (pair)
fsl_asrc_release_pair(pair);
return 0;
}
static int fsl_asrc_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct fsl_asrc_pair *pair = runtime->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
fsl_asrc_start_pair(pair);
/* Output enough data to content the DMA burstsize of BE */
mdelay(1);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
fsl_asrc_stop_pair(pair);
break;
default:
return -EINVAL;
}
return 0;
}
static int fsl_asrc_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(cpu_dai);
asrc_priv->substream[substream->stream] = substream;
return 0;
}
static void fsl_asrc_dai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(cpu_dai);
asrc_priv->substream[substream->stream] = NULL;
}
static struct snd_soc_dai_ops fsl_asrc_dai_ops = {
.startup = fsl_asrc_dai_startup,
.shutdown = fsl_asrc_dai_shutdown,
.hw_params = fsl_asrc_dai_hw_params,
.hw_free = fsl_asrc_dai_hw_free,
.trigger = fsl_asrc_dai_trigger,
};
static int fsl_asrc_dai_probe(struct snd_soc_dai *dai)
{
struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, &asrc_priv->dma_params_tx,
&asrc_priv->dma_params_rx);
return 0;
}
#define FSL_ASRC_RATES SNDRV_PCM_RATE_8000_192000
#define FSL_ASRC_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | \
SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S20_3LE)
static struct snd_soc_dai_driver fsl_asrc_dai = {
.probe = fsl_asrc_dai_probe,
.playback = {
.stream_name = "ASRC-Playback",
.channels_min = 1,
.channels_max = 10,
.rates = FSL_ASRC_RATES,
.formats = FSL_ASRC_FORMATS,
},
.capture = {
.stream_name = "ASRC-Capture",
.channels_min = 1,
.channels_max = 10,
.rates = FSL_ASRC_RATES,
.formats = FSL_ASRC_FORMATS,
},
.ops = &fsl_asrc_dai_ops,
};
static const struct snd_soc_component_driver fsl_asrc_component = {
.name = "fsl-asrc-dai",
};
static bool fsl_asrc_readable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case REG_ASRCTR:
case REG_ASRIER:
case REG_ASRCNCR:
case REG_ASRCFG:
case REG_ASRCSR:
case REG_ASRCDR1:
case REG_ASRCDR2:
case REG_ASRSTR:
case REG_ASRPM1:
case REG_ASRPM2:
case REG_ASRPM3:
case REG_ASRPM4:
case REG_ASRPM5:
case REG_ASRTFR1:
case REG_ASRCCR:
case REG_ASRDOA:
case REG_ASRDOB:
case REG_ASRDOC:
case REG_ASRIDRHA:
case REG_ASRIDRLA:
case REG_ASRIDRHB:
case REG_ASRIDRLB:
case REG_ASRIDRHC:
case REG_ASRIDRLC:
case REG_ASR76K:
case REG_ASR56K:
case REG_ASRMCRA:
case REG_ASRFSTA:
case REG_ASRMCRB:
case REG_ASRFSTB:
case REG_ASRMCRC:
case REG_ASRFSTC:
case REG_ASRMCR1A:
case REG_ASRMCR1B:
case REG_ASRMCR1C:
return true;
default:
return false;
}
}
static bool fsl_asrc_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case REG_ASRSTR:
case REG_ASRDIA:
case REG_ASRDIB:
case REG_ASRDIC:
case REG_ASRDOA:
case REG_ASRDOB:
case REG_ASRDOC:
case REG_ASRFSTA:
case REG_ASRFSTB:
case REG_ASRFSTC:
case REG_ASRCFG:
return true;
default:
return false;
}
}
static bool fsl_asrc_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case REG_ASRCTR:
case REG_ASRIER:
case REG_ASRCNCR:
case REG_ASRCFG:
case REG_ASRCSR:
case REG_ASRCDR1:
case REG_ASRCDR2:
case REG_ASRSTR:
case REG_ASRPM1:
case REG_ASRPM2:
case REG_ASRPM3:
case REG_ASRPM4:
case REG_ASRPM5:
case REG_ASRTFR1:
case REG_ASRCCR:
case REG_ASRDIA:
case REG_ASRDIB:
case REG_ASRDIC:
case REG_ASRIDRHA:
case REG_ASRIDRLA:
case REG_ASRIDRHB:
case REG_ASRIDRLB:
case REG_ASRIDRHC:
case REG_ASRIDRLC:
case REG_ASR76K:
case REG_ASR56K:
case REG_ASRMCRA:
case REG_ASRMCRB:
case REG_ASRMCRC:
case REG_ASRMCR1A:
case REG_ASRMCR1B:
case REG_ASRMCR1C:
return true;
default:
return false;
}
}
static struct regmap_config fsl_asrc_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = REG_ASRMCR1C,
.readable_reg = fsl_asrc_readable_reg,
.volatile_reg = fsl_asrc_volatile_reg,
.writeable_reg = fsl_asrc_writeable_reg,
.cache_type = REGCACHE_RBTREE,
};
#include "fsl_asrc_m2m.c"
static bool fsl_asrc_check_xrun(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
struct snd_pcm_substream *be_substream;
struct snd_soc_dpcm *dpcm;
int ret = 0;
/* find the be for this fe stream */
list_for_each_entry(dpcm, &rtd->dpcm[substream->stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_soc_dai *dai = be->cpu_dai;
if (dpcm->fe != rtd)
continue;
be_substream = snd_soc_dpcm_get_substream(be, substream->stream);
dma_params_be = snd_soc_dai_get_dma_data(dai, be_substream);
if (dma_params_be->check_xrun && dma_params_be->check_xrun(be_substream))
ret = 1;
}
return ret;
}
static int stop_lock_stream(struct snd_pcm_substream *substream)
{
if (substream) {
snd_pcm_stream_lock_irq(substream);
if (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING)
substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
}
return 0;
}
static int start_unlock_stream(struct snd_pcm_substream *substream)
{
if (substream) {
if (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING)
substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
snd_pcm_stream_unlock_irq(substream);
}
return 0;
}
static void fsl_asrc_reset(struct snd_pcm_substream *substream, bool stop)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct fsl_asrc *asrc_priv = snd_soc_dai_get_drvdata(cpu_dai);
struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
struct snd_soc_dpcm *dpcm;
struct snd_pcm_substream *be_substream;
if (stop) {
stop_lock_stream(asrc_priv->substream[0]);
stop_lock_stream(asrc_priv->substream[1]);
}
/* find the be for this fe stream */
list_for_each_entry(dpcm, &rtd->dpcm[substream->stream].be_clients, list_be) {
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_soc_dai *dai = be->cpu_dai;
if (dpcm->fe != rtd)
continue;
be_substream = snd_soc_dpcm_get_substream(be, substream->stream);
dma_params_be = snd_soc_dai_get_dma_data(dai, be_substream);
dma_params_be->device_reset(be_substream, 0);
break;
}
if (stop) {
start_unlock_stream(asrc_priv->substream[1]);
start_unlock_stream(asrc_priv->substream[0]);
}
}
/**
* Initialize ASRC registers with a default configurations
*/
static int fsl_asrc_init(struct fsl_asrc *asrc_priv)
{
/* Halt ASRC internal FP when input FIFO needs data for pair A, B, C */
regmap_write(asrc_priv->regmap, REG_ASRCTR, ASRCTR_ASRCEN);
/* Disable interrupt by default */
regmap_write(asrc_priv->regmap, REG_ASRIER, 0x0);
/* Apply recommended settings for parameters from Reference Manual */
regmap_write(asrc_priv->regmap, REG_ASRPM1, 0x7fffff);
regmap_write(asrc_priv->regmap, REG_ASRPM2, 0x255555);
regmap_write(asrc_priv->regmap, REG_ASRPM3, 0xff7280);
regmap_write(asrc_priv->regmap, REG_ASRPM4, 0xff7280);
regmap_write(asrc_priv->regmap, REG_ASRPM5, 0xff7280);
/* Base address for task queue FIFO. Set to 0x7C */
regmap_update_bits(asrc_priv->regmap, REG_ASRTFR1,
ASRTFR1_TF_BASE_MASK, ASRTFR1_TF_BASE(0xfc));
/* Set the processing clock for 76KHz to 133M */
regmap_write(asrc_priv->regmap, REG_ASR76K, 0x06D6);
/* Set the processing clock for 56KHz to 133M */
return regmap_write(asrc_priv->regmap, REG_ASR56K, 0x0947);
}
/**
* Interrupt handler for ASRC
*/
static irqreturn_t fsl_asrc_isr(int irq, void *dev_id)
{
struct fsl_asrc *asrc_priv = (struct fsl_asrc *)dev_id;
struct device *dev = &asrc_priv->pdev->dev;
enum asrc_pair_index index;
u32 status;
regmap_read(asrc_priv->regmap, REG_ASRSTR, &status);
/* Clean overload error */
regmap_write(asrc_priv->regmap, REG_ASRSTR, ASRSTR_AOLE);
/*
* We here use dev_dbg() for all exceptions because ASRC itself does
* not care if FIFO overflowed or underrun while a warning in the
* interrupt would result a ridged conversion.
*/
for (index = ASRC_PAIR_A; index < ASRC_PAIR_MAX_NUM; index++) {
if (!asrc_priv->pair[index])
continue;
if (status & ASRSTR_ATQOL) {
asrc_priv->pair[index]->error |= ASRC_TASK_Q_OVERLOAD;
dev_dbg(dev, "ASRC Task Queue FIFO overload\n");
}
if (status & ASRSTR_AOOL(index)) {
asrc_priv->pair[index]->error |= ASRC_OUTPUT_TASK_OVERLOAD;
pair_dbg("Output Task Overload\n");
}
if (status & ASRSTR_AIOL(index)) {
asrc_priv->pair[index]->error |= ASRC_INPUT_TASK_OVERLOAD;
pair_dbg("Input Task Overload\n");
}
if (status & ASRSTR_AODO(index)) {
asrc_priv->pair[index]->error |= ASRC_OUTPUT_BUFFER_OVERFLOW;
pair_dbg("Output Data Buffer has overflowed\n");
}
if (status & ASRSTR_AIDU(index)) {
asrc_priv->pair[index]->error |= ASRC_INPUT_BUFFER_UNDERRUN;
pair_dbg("Input Data Buffer has underflowed\n");
}
}
return IRQ_HANDLED;
}
static int fsl_asrc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct fsl_asrc *asrc_priv;
struct resource *res;
void __iomem *regs;
int irq, ret, i;
char tmp[16];
asrc_priv = devm_kzalloc(&pdev->dev, sizeof(*asrc_priv), GFP_KERNEL);
if (!asrc_priv)
return -ENOMEM;
asrc_priv->pdev = pdev;
strcpy(asrc_priv->name, np->name);
/* Get the addresses and IRQ */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(regs))
return PTR_ERR(regs);
asrc_priv->paddr = res->start;
/* Register regmap and let it prepare core clock */
if (of_property_read_bool(np, "big-endian"))
fsl_asrc_regmap_config.val_format_endian = REGMAP_ENDIAN_BIG;
asrc_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "mem", regs,
&fsl_asrc_regmap_config);
if (IS_ERR(asrc_priv->regmap)) {
dev_err(&pdev->dev, "failed to init regmap\n");
return PTR_ERR(asrc_priv->regmap);
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no irq for node %s\n", np->full_name);
return irq;
}
ret = devm_request_irq(&pdev->dev, irq, fsl_asrc_isr, 0,
asrc_priv->name, asrc_priv);
if (ret) {
dev_err(&pdev->dev, "failed to claim irq %u: %d\n", irq, ret);
return ret;
}
asrc_priv->mem_clk = devm_clk_get(&pdev->dev, "mem");
if (IS_ERR(asrc_priv->mem_clk)) {
dev_err(&pdev->dev, "failed to get mem clock\n");
return PTR_ERR(asrc_priv->mem_clk);
}
asrc_priv->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(asrc_priv->ipg_clk)) {
dev_err(&pdev->dev, "failed to get ipg clock\n");
return PTR_ERR(asrc_priv->ipg_clk);
}
asrc_priv->dma_clk = devm_clk_get(&pdev->dev, "dma");
if (IS_ERR(asrc_priv->dma_clk)) {
dev_err(&pdev->dev, "failed to get dma script clock\n");
return PTR_ERR(asrc_priv->dma_clk);
}
for (i = 0; i < ASRC_CLK_MAX_NUM; i++) {
sprintf(tmp, "asrck_%x", i);
asrc_priv->asrck_clk[i] = devm_clk_get(&pdev->dev, tmp);
if (IS_ERR(asrc_priv->asrck_clk[i])) {
dev_err(&pdev->dev, "failed to get %s clock\n", tmp);
return PTR_ERR(asrc_priv->asrck_clk[i]);
}
}
if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx35-asrc")) {
asrc_priv->channel_bits = 3;
clk_map[IN] = input_clk_map_imx35;
clk_map[OUT] = output_clk_map_imx35;
} else {
asrc_priv->channel_bits = 4;
clk_map[IN] = input_clk_map_imx53;
clk_map[OUT] = output_clk_map_imx53;
}
ret = fsl_asrc_init(asrc_priv);
if (ret) {
dev_err(&pdev->dev, "failed to init asrc %d\n", ret);
return -EINVAL;
}
asrc_priv->channel_avail = 10;
ret = of_property_read_u32(np, "fsl,asrc-rate",
&asrc_priv->asrc_rate);
if (ret) {
dev_err(&pdev->dev, "failed to get output rate\n");
return -EINVAL;
}
ret = of_property_read_u32(np, "fsl,asrc-width",
&asrc_priv->asrc_width);
if (ret) {
dev_err(&pdev->dev, "failed to get output width\n");
return -EINVAL;
}
asrc_priv->dma_params_tx.check_xrun = fsl_asrc_check_xrun;
asrc_priv->dma_params_rx.check_xrun = fsl_asrc_check_xrun;
asrc_priv->dma_params_tx.device_reset = fsl_asrc_reset;
asrc_priv->dma_params_rx.device_reset = fsl_asrc_reset;
if (asrc_priv->asrc_width != 16 && asrc_priv->asrc_width != 24) {
dev_warn(&pdev->dev, "unsupported width, switching to 24bit\n");
asrc_priv->asrc_width = 24;
}
platform_set_drvdata(pdev, asrc_priv);
pm_runtime_enable(&pdev->dev);
spin_lock_init(&asrc_priv->lock);
ret = devm_snd_soc_register_component(&pdev->dev, &fsl_asrc_component,
&fsl_asrc_dai, 1);
if (ret) {
dev_err(&pdev->dev, "failed to register ASoC DAI\n");
return ret;
}
ret = devm_snd_soc_register_platform(&pdev->dev, &fsl_asrc_platform);
if (ret) {
dev_err(&pdev->dev, "failed to register ASoC platform\n");
return ret;
}
ret = fsl_asrc_m2m_init(asrc_priv);
if (ret) {
dev_err(&pdev->dev, "failed to init m2m device %d\n", ret);
return ret;
}
dev_info(&pdev->dev, "driver registered\n");
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int fsl_asrc_runtime_resume(struct device *dev)
{
struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
int i;
clk_prepare_enable(asrc_priv->mem_clk);
clk_prepare_enable(asrc_priv->ipg_clk);
clk_prepare_enable(asrc_priv->dma_clk);
for (i = 0; i < ASRC_CLK_MAX_NUM; i++)
clk_prepare_enable(asrc_priv->asrck_clk[i]);
return 0;
}
static int fsl_asrc_runtime_suspend(struct device *dev)
{
struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
int i;
for (i = 0; i < ASRC_CLK_MAX_NUM; i++)
clk_disable_unprepare(asrc_priv->asrck_clk[i]);
clk_disable_unprepare(asrc_priv->dma_clk);
clk_disable_unprepare(asrc_priv->ipg_clk);
clk_disable_unprepare(asrc_priv->mem_clk);
return 0;
}
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
static int fsl_asrc_suspend(struct device *dev)
{
struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
fsl_asrc_m2m_suspend(asrc_priv);
regmap_read(asrc_priv->regmap, REG_ASRCFG,
&asrc_priv->regcache_cfg);
regcache_cache_only(asrc_priv->regmap, true);
regcache_mark_dirty(asrc_priv->regmap);
return 0;
}
static int fsl_asrc_resume(struct device *dev)
{
struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
u32 asrctr;
/* Stop all pairs provisionally */
regmap_read(asrc_priv->regmap, REG_ASRCTR, &asrctr);
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_ASRCEi_ALL_MASK, 0);
/* Restore all registers */
regcache_cache_only(asrc_priv->regmap, false);
regcache_sync(asrc_priv->regmap);
regmap_update_bits(asrc_priv->regmap, REG_ASRCFG,
0x1FFFC0, asrc_priv->regcache_cfg);
/* Restart enabled pairs */
regmap_update_bits(asrc_priv->regmap, REG_ASRCTR,
ASRCTR_ASRCEi_ALL_MASK, asrctr);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops fsl_asrc_pm = {
SET_RUNTIME_PM_OPS(fsl_asrc_runtime_suspend, fsl_asrc_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(fsl_asrc_suspend, fsl_asrc_resume)
};
static const struct of_device_id fsl_asrc_ids[] = {
{ .compatible = "fsl,imx35-asrc", },
{ .compatible = "fsl,imx53-asrc", },
{}
};
MODULE_DEVICE_TABLE(of, fsl_asrc_ids);
static struct platform_driver fsl_asrc_driver = {
.probe = fsl_asrc_probe,
.remove = fsl_asrc_m2m_remove,
.driver = {
.name = "fsl-asrc",
.of_match_table = fsl_asrc_ids,
.pm = &fsl_asrc_pm,
},
};
module_platform_driver(fsl_asrc_driver);
MODULE_DESCRIPTION("Freescale ASRC ASoC driver");
MODULE_AUTHOR("Nicolin Chen <nicoleotsuka@gmail.com>");
MODULE_ALIAS("platform:fsl-asrc");
MODULE_LICENSE("GPL v2");