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-rw-r--r--sound/soc/fsl/fsl_asrc.c995
1 files changed, 995 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c
new file mode 100644
index 000000000000..822110420b71
--- /dev/null
+++ b/sound/soc/fsl/fsl_asrc.c
@@ -0,0 +1,995 @@
+/*
+ * Freescale ASRC ALSA SoC Digital Audio Interface (DAI) driver
+ *
+ * Copyright (C) 2014 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) {
+ 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)
+{
+ 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]];
+
+ /* Use fixed output rate for Ideal Ratio mode (INCLK_NONE) */
+ if (ideal)
+ div[OUT] = clk_get_rate(clk) / IDEAL_RATIO_RATE;
+ else
+ div[OUT] = clk_get_rate(clk) / outrate;
+
+ 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;
+ } 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);
+ 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);
+ 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 struct snd_soc_dai_ops fsl_asrc_dai_ops = {
+ .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,
+};
+
+/**
+ * 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);
+ }
+
+ 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;
+ }
+
+ 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;
+ }
+
+ 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);
+ 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->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);
+
+ 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);
+
+ /* 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,
+ .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");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.