ASRC can be used on memory to memory case, define several
functions for m2m usage.
m2m_prepare: prepare for the start step
m2m_start: the start step
m2m_unprepare: unprepare for stop step, optional
m2m_stop: stop step
m2m_check_format: check format is supported or not
m2m_calc_out_len: calculate output length according to input length
m2m_get_maxburst: burst size for dma
m2m_pair_suspend: suspend function of pair, optional.
m2m_pair_resume: resume function of pair
get_output_fifo_size: get remaining data size in FIFO
Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
Acked-by: Mark Brown <broonie@xxxxxxxxxx>
---
sound/soc/fsl/fsl_asrc.c | 126 ++++++++++++++++++++++++++++++++
sound/soc/fsl/fsl_asrc.h | 2 +
sound/soc/fsl/fsl_asrc_common.h | 37 ++++++++++
3 files changed, 165 insertions(+)
diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c
index b793263291dc..7d8643ee0ba0 100644
--- a/sound/soc/fsl/fsl_asrc.c
+++ b/sound/soc/fsl/fsl_asrc.c
@@ -1063,6 +1063,124 @@ static int fsl_asrc_get_fifo_addr(u8 dir, enum asrc_pair_index index)
return REG_ASRDx(dir, index);
}
+/* Get sample numbers in FIFO */
+static unsigned int fsl_asrc_get_output_fifo_size(struct fsl_asrc_pair *pair)
+{
+ struct fsl_asrc *asrc = pair->asrc;
+ enum asrc_pair_index index = pair->index;
+ u32 val;
+
+ regmap_read(asrc->regmap, REG_ASRFST(index), &val);
+
+ val &= ASRFSTi_OUTPUT_FIFO_MASK;
+
+ return val >> ASRFSTi_OUTPUT_FIFO_SHIFT;
+}
+
+static int fsl_asrc_m2m_prepare(struct fsl_asrc_pair *pair)
+{
+ struct fsl_asrc_pair_priv *pair_priv = pair->private;
+ struct fsl_asrc *asrc = pair->asrc;
+ struct device *dev = &asrc->pdev->dev;
+ struct asrc_config config;
+ int ret;
+
+ /* fill config */
+ config.pair = pair->index;
+ config.channel_num = pair->channels;
+ config.input_sample_rate = pair->rate[IN];
+ config.output_sample_rate = pair->rate[OUT];
+ config.input_format = pair->sample_format[IN];
+ config.output_format = pair->sample_format[OUT];
+ config.inclk = INCLK_NONE;
+ config.outclk = OUTCLK_ASRCK1_CLK;
+
+ pair_priv->config = &config;
+ ret = fsl_asrc_config_pair(pair, true);
+ if (ret) {
+ dev_err(dev, "failed to config pair: %d\n", ret);
+ return ret;
+ }
+
+ pair->first_convert = 1;
+
+ return 0;
+}
+
+static int fsl_asrc_m2m_start(struct fsl_asrc_pair *pair)
+{
+ if (pair->first_convert) {
+ fsl_asrc_start_pair(pair);
+ pair->first_convert = 0;
+ }
+ /*
+ * Clear DMA request during the stall state of ASRC:
+ * During STALL state, the remaining in input fifo would never be
+ * smaller than the input threshold while the output fifo would not
+ * be bigger than output one. Thus the DMA request would be cleared.
+ */
+ fsl_asrc_set_watermarks(pair, ASRC_FIFO_THRESHOLD_MIN,
+ ASRC_FIFO_THRESHOLD_MAX);
+
+ /* Update the real input threshold to raise DMA request */
+ fsl_asrc_set_watermarks(pair, ASRC_M2M_INPUTFIFO_WML,
+ ASRC_M2M_OUTPUTFIFO_WML);
+
+ return 0;
+}
+
+static int fsl_asrc_m2m_stop(struct fsl_asrc_pair *pair)
+{
+ if (!pair->first_convert) {
+ fsl_asrc_stop_pair(pair);
+ pair->first_convert = 1;
+ }
+
+ return 0;
+}
+
+/* calculate capture data length according to output data length and sample rate */
+static int fsl_asrc_m2m_calc_out_len(struct fsl_asrc_pair *pair, int input_buffer_length)
+{
+ unsigned int in_width, out_width;
+ unsigned int channels = pair->channels;
+ unsigned int in_samples, out_samples;
+ unsigned int out_length;
+
+ in_width = snd_pcm_format_physical_width(pair->sample_format[IN]) / 8;
+ out_width = snd_pcm_format_physical_width(pair->sample_format[OUT]) / 8;
+
+ in_samples = input_buffer_length / in_width / channels;
+ out_samples = pair->rate[OUT] * in_samples / pair->rate[IN];
+ out_length = (out_samples - ASRC_OUTPUT_LAST_SAMPLE) * out_width * channels;
+
+ return out_length;
+}
+
+static int fsl_asrc_m2m_get_maxburst(u8 dir, struct fsl_asrc_pair *pair)
+{
+ struct fsl_asrc *asrc = pair->asrc;
+ struct fsl_asrc_priv *asrc_priv = asrc->private;
+ int wml = (dir == IN) ? ASRC_M2M_INPUTFIFO_WML : ASRC_M2M_OUTPUTFIFO_WML;
+
+ if (!asrc_priv->soc->use_edma)
+ return wml * pair->channels;
+ else
+ return 1;
+}
+
+static int fsl_asrc_m2m_pair_resume(struct fsl_asrc_pair *pair)
+{
+ struct fsl_asrc *asrc = pair->asrc;
+ int i;
+
+ for (i = 0; i < pair->channels * 4; i++)
+ regmap_write(asrc->regmap, REG_ASRDI(pair->index), 0);
+
+ pair->first_convert = 1;
+ return 0;
+}
+
static int fsl_asrc_runtime_resume(struct device *dev);
static int fsl_asrc_runtime_suspend(struct device *dev);
@@ -1147,6 +1265,14 @@ static int fsl_asrc_probe(struct platform_device *pdev)
asrc->get_fifo_addr = fsl_asrc_get_fifo_addr;
asrc->pair_priv_size = sizeof(struct fsl_asrc_pair_priv);
+ asrc->m2m_prepare = fsl_asrc_m2m_prepare;
+ asrc->m2m_start = fsl_asrc_m2m_start;
+ asrc->m2m_stop = fsl_asrc_m2m_stop;
+ asrc->get_output_fifo_size = fsl_asrc_get_output_fifo_size;
+ asrc->m2m_calc_out_len = fsl_asrc_m2m_calc_out_len;
+ asrc->m2m_get_maxburst = fsl_asrc_m2m_get_maxburst;
+ asrc->m2m_pair_resume = fsl_asrc_m2m_pair_resume;
+
if (of_device_is_compatible(np, "fsl,imx35-asrc")) {
asrc_priv->clk_map[IN] = input_clk_map_imx35;
asrc_priv->clk_map[OUT] = output_clk_map_imx35;
diff --git a/sound/soc/fsl/fsl_asrc.h b/sound/soc/fsl/fsl_asrc.h
index 86d2422ad606..1c492eb237f5 100644
--- a/sound/soc/fsl/fsl_asrc.h
+++ b/sound/soc/fsl/fsl_asrc.h
@@ -12,6 +12,8 @@
#include "fsl_asrc_common.h"
+#define ASRC_M2M_INPUTFIFO_WML 0x4
+#define ASRC_M2M_OUTPUTFIFO_WML 0x2
#define ASRC_DMA_BUFFER_NUM 2
#define ASRC_INPUTFIFO_THRESHOLD 32
#define ASRC_OUTPUTFIFO_THRESHOLD 32
diff --git a/sound/soc/fsl/fsl_asrc_common.h b/sound/soc/fsl/fsl_asrc_common.h
index 7e1c13ca37f1..3b53d366182f 100644
--- a/sound/soc/fsl/fsl_asrc_common.h
+++ b/sound/soc/fsl/fsl_asrc_common.h
@@ -34,6 +34,12 @@ enum asrc_pair_index {
* @pos: hardware pointer position
* @req_dma_chan: flag to release dev_to_dev chan
* @private: pair private area
+ * @complete: dma task complete
+ * @sample_format: format of m2m
+ * @rate: rate of m2m
+ * @buf_len: buffer length of m2m
+ * @first_convert: start of conversion
+ * @req_pair: flag for request pair
*/
struct fsl_asrc_pair {
struct fsl_asrc *asrc;
@@ -49,6 +55,14 @@ struct fsl_asrc_pair {
bool req_dma_chan;
void *private;
+
+ /* used for m2m */
+ struct completion complete[2];
+ snd_pcm_format_t sample_format[2];
+ unsigned int rate[2];
+ unsigned int buf_len[2];
+ unsigned int first_convert;
+ bool req_pair;
};
/**
@@ -72,6 +86,16 @@ struct fsl_asrc_pair {
* @request_pair: function pointer
* @release_pair: function pointer
* @get_fifo_addr: function pointer
+ * @m2m_prepare: function pointer
+ * @m2m_start: function pointer
+ * @m2m_unprepare: function pointer
+ * @m2m_stop: function pointer
+ * @m2m_calc_out_len: function pointer
+ * @m2m_get_maxburst: function pointer
+ * @m2m_pair_suspend: function pointer
+ * @m2m_pair_resume: function pointer
+ * @m2m_set_ratio_mod: function pointer
+ * @get_output_fifo_size: function pointer
* @pair_priv_size: size of pair private struct.
* @private: private data structure
*/
@@ -97,6 +121,19 @@ struct fsl_asrc {
int (*request_pair)(int channels, struct fsl_asrc_pair *pair);
void (*release_pair)(struct fsl_asrc_pair *pair);
int (*get_fifo_addr)(u8 dir, enum asrc_pair_index index);
+
+ int (*m2m_prepare)(struct fsl_asrc_pair *pair);
+ int (*m2m_start)(struct fsl_asrc_pair *pair);
+ int (*m2m_unprepare)(struct fsl_asrc_pair *pair);
+ int (*m2m_stop)(struct fsl_asrc_pair *pair);
+
+ int (*m2m_calc_out_len)(struct fsl_asrc_pair *pair, int input_buffer_length);
+ int (*m2m_get_maxburst)(u8 dir, struct fsl_asrc_pair *pair);
+ int (*m2m_pair_suspend)(struct fsl_asrc_pair *pair);
+ int (*m2m_pair_resume)(struct fsl_asrc_pair *pair);
+ int (*m2m_set_ratio_mod)(struct fsl_asrc_pair *pair, int val);
+
+ unsigned int (*get_output_fifo_size)(struct fsl_asrc_pair *pair);
size_t pair_priv_size;
void *private;
--
2.34.1
