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Diffstat (limited to 'sound/soc/fsl/fsl_sai.c')
-rw-r--r--sound/soc/fsl/fsl_sai.c144
1 files changed, 136 insertions, 8 deletions
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index ec79c3d5e65e..5c73bea7b11e 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -1,7 +1,7 @@
/*
* Freescale ALSA SoC Digital Audio Interface (SAI) driver.
*
- * Copyright 2012-2013 Freescale Semiconductor, Inc.
+ * 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
@@ -27,6 +27,17 @@
#define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
FSL_SAI_CSR_FEIE)
+static u32 fsl_sai_rates[] = {
+ 8000, 11025, 12000, 16000, 22050,
+ 24000, 32000, 44100, 48000, 64000,
+ 88200, 96000, 176400, 192000
+};
+
+static 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;
@@ -251,12 +262,14 @@ static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
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;
@@ -288,6 +301,79 @@ static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
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;
+ }
+
+ if ((tx && sai->synchronous[TX]) || (!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 {
+ 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)
@@ -297,6 +383,24 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
unsigned int channels = params_channels(params);
u32 word_width = snd_pcm_format_width(params_format(params));
u32 val_cr4 = 0, val_cr5 = 0;
+ int ret;
+
+ if (!sai->is_slave_mode) {
+ ret = fsl_sai_set_bclk(cpu_dai, tx,
+ 2 * word_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(word_width);
@@ -322,6 +426,22 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
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)
{
@@ -410,7 +530,10 @@ static int fsl_sai_startup(struct snd_pcm_substream *substream,
regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
FSL_SAI_CR3_TRCE);
- return 0;
+ 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,
@@ -428,6 +551,7 @@ 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,
.hw_params = fsl_sai_hw_params,
+ .hw_free = fsl_sai_hw_free,
.trigger = fsl_sai_trigger,
.startup = fsl_sai_startup,
.shutdown = fsl_sai_shutdown,
@@ -463,14 +587,18 @@ static struct snd_soc_dai_driver fsl_sai_dai = {
.stream_name = "CPU-Playback",
.channels_min = 1,
.channels_max = 2,
- .rates = SNDRV_PCM_RATE_8000_96000,
+ .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,
- .rates = SNDRV_PCM_RATE_8000_96000,
+ .rate_min = 8000,
+ .rate_max = 192000,
+ .rates = SNDRV_PCM_RATE_KNOT,
.formats = FSL_SAI_FORMATS,
},
.ops = &fsl_sai_pcm_dai_ops,
@@ -600,8 +728,9 @@ static int fsl_sai_probe(struct platform_device *pdev)
sai->bus_clk = NULL;
}
- for (i = 0; i < FSL_SAI_MCLK_MAX; i++) {
- sprintf(tmp, "mclk%d", i + 1);
+ 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",
@@ -664,8 +793,7 @@ static int fsl_sai_probe(struct platform_device *pdev)
if (sai->sai_on_imx)
return imx_pcm_dma_init(pdev);
else
- return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
- SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
+ return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
}
static const struct of_device_id fsl_sai_ids[] = {
generated by cgit (git 2.34.1) at 2024-05-22 13:23:28 +0000