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-rw-r--r--sound/soc/meson/aiu-encoder-i2s.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/sound/soc/meson/aiu-encoder-i2s.c b/sound/soc/meson/aiu-encoder-i2s.c
new file mode 100644
index 0000000000..a0dd914c8e
--- /dev/null
+++ b/sound/soc/meson/aiu-encoder-i2s.c
@@ -0,0 +1,331 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2020 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "aiu.h"
+
+#define AIU_I2S_SOURCE_DESC_MODE_8CH BIT(0)
+#define AIU_I2S_SOURCE_DESC_MODE_24BIT BIT(5)
+#define AIU_I2S_SOURCE_DESC_MODE_32BIT BIT(9)
+#define AIU_I2S_SOURCE_DESC_MODE_SPLIT BIT(11)
+#define AIU_RST_SOFT_I2S_FAST BIT(0)
+
+#define AIU_I2S_DAC_CFG_MSB_FIRST BIT(2)
+#define AIU_CLK_CTRL_I2S_DIV_EN BIT(0)
+#define AIU_CLK_CTRL_I2S_DIV GENMASK(3, 2)
+#define AIU_CLK_CTRL_AOCLK_INVERT BIT(6)
+#define AIU_CLK_CTRL_LRCLK_INVERT BIT(7)
+#define AIU_CLK_CTRL_LRCLK_SKEW GENMASK(9, 8)
+#define AIU_CLK_CTRL_MORE_HDMI_AMCLK BIT(6)
+#define AIU_CLK_CTRL_MORE_I2S_DIV GENMASK(5, 0)
+#define AIU_CODEC_DAC_LRCLK_CTRL_DIV GENMASK(11, 0)
+
+static void aiu_encoder_i2s_divider_enable(struct snd_soc_component *component,
+ bool enable)
+{
+ snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+ AIU_CLK_CTRL_I2S_DIV_EN,
+ enable ? AIU_CLK_CTRL_I2S_DIV_EN : 0);
+}
+
+static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
+ struct snd_pcm_hw_params *params)
+{
+ /* Always operate in split (classic interleaved) mode */
+ unsigned int desc = AIU_I2S_SOURCE_DESC_MODE_SPLIT;
+
+ /* Reset required to update the pipeline */
+ snd_soc_component_write(component, AIU_RST_SOFT, AIU_RST_SOFT_I2S_FAST);
+ snd_soc_component_read(component, AIU_I2S_SYNC);
+
+ switch (params_physical_width(params)) {
+ case 16: /* Nothing to do */
+ break;
+
+ case 32:
+ desc |= (AIU_I2S_SOURCE_DESC_MODE_24BIT |
+ AIU_I2S_SOURCE_DESC_MODE_32BIT);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ switch (params_channels(params)) {
+ case 2: /* Nothing to do */
+ break;
+ case 8:
+ desc |= AIU_I2S_SOURCE_DESC_MODE_8CH;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ snd_soc_component_update_bits(component, AIU_I2S_SOURCE_DESC,
+ AIU_I2S_SOURCE_DESC_MODE_8CH |
+ AIU_I2S_SOURCE_DESC_MODE_24BIT |
+ AIU_I2S_SOURCE_DESC_MODE_32BIT |
+ AIU_I2S_SOURCE_DESC_MODE_SPLIT,
+ desc);
+
+ return 0;
+}
+
+static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
+ struct snd_pcm_hw_params *params,
+ unsigned int bs)
+{
+ switch (bs) {
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ /* These are the only valid legacy dividers */
+ break;
+
+ default:
+ dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
+ return -EINVAL;
+ }
+
+ snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+ AIU_CLK_CTRL_I2S_DIV,
+ FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
+ __ffs(bs)));
+
+ snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
+ AIU_CLK_CTRL_MORE_I2S_DIV,
+ FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
+ 0));
+
+ return 0;
+}
+
+static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
+ struct snd_pcm_hw_params *params,
+ unsigned int bs)
+{
+ /*
+ * NOTE: this HW is odd.
+ * In most configuration, the i2s divider is 'mclk / blck'.
+ * However, in 16 bits - 8ch mode, this factor needs to be
+ * increased by 50% to get the correct output rate.
+ * No idea why !
+ */
+ if (params_width(params) == 16 && params_channels(params) == 8) {
+ if (bs % 2) {
+ dev_err(component->dev,
+ "Cannot increase i2s divider by 50%%\n");
+ return -EINVAL;
+ }
+ bs += bs / 2;
+ }
+
+ /* Use CLK_MORE for mclk to bclk divider */
+ snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+ AIU_CLK_CTRL_I2S_DIV,
+ FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));
+
+ snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
+ AIU_CLK_CTRL_MORE_I2S_DIV,
+ FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
+ bs - 1));
+
+ return 0;
+}
+
+static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
+ struct snd_pcm_hw_params *params)
+{
+ struct aiu *aiu = snd_soc_component_get_drvdata(component);
+ unsigned int srate = params_rate(params);
+ unsigned int fs, bs;
+ int ret;
+
+ /* Get the oversampling factor */
+ fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
+
+ if (fs % 64)
+ return -EINVAL;
+
+ /* Send data MSB first */
+ snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
+ AIU_I2S_DAC_CFG_MSB_FIRST,
+ AIU_I2S_DAC_CFG_MSB_FIRST);
+
+ /* Set bclk to lrlck ratio */
+ snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
+ AIU_CODEC_DAC_LRCLK_CTRL_DIV,
+ FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
+ 64 - 1));
+
+ bs = fs / 64;
+
+ if (aiu->platform->has_clk_ctrl_more_i2s_div)
+ ret = aiu_encoder_i2s_set_more_div(component, params, bs);
+ else
+ ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);
+
+ if (ret)
+ return ret;
+
+ /* Make sure amclk is used for HDMI i2s as well */
+ snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
+ AIU_CLK_CTRL_MORE_HDMI_AMCLK,
+ AIU_CLK_CTRL_MORE_HDMI_AMCLK);
+
+ return 0;
+}
+
+static int aiu_encoder_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+ int ret;
+
+ /* Disable the clock while changing the settings */
+ aiu_encoder_i2s_divider_enable(component, false);
+
+ ret = aiu_encoder_i2s_setup_desc(component, params);
+ if (ret) {
+ dev_err(dai->dev, "setting i2s desc failed\n");
+ return ret;
+ }
+
+ ret = aiu_encoder_i2s_set_clocks(component, params);
+ if (ret) {
+ dev_err(dai->dev, "setting i2s clocks failed\n");
+ return ret;
+ }
+
+ aiu_encoder_i2s_divider_enable(component, true);
+
+ return 0;
+}
+
+static int aiu_encoder_i2s_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+
+ aiu_encoder_i2s_divider_enable(component, false);
+
+ return 0;
+}
+
+static int aiu_encoder_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct snd_soc_component *component = dai->component;
+ unsigned int inv = fmt & SND_SOC_DAIFMT_INV_MASK;
+ unsigned int val = 0;
+ unsigned int skew;
+
+ /* Only CPU Master / Codec Slave supported ATM */
+ if ((fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) != SND_SOC_DAIFMT_BP_FP)
+ return -EINVAL;
+
+ if (inv == SND_SOC_DAIFMT_NB_IF ||
+ inv == SND_SOC_DAIFMT_IB_IF)
+ val |= AIU_CLK_CTRL_LRCLK_INVERT;
+
+ if (inv == SND_SOC_DAIFMT_IB_NF ||
+ inv == SND_SOC_DAIFMT_IB_IF)
+ val |= AIU_CLK_CTRL_AOCLK_INVERT;
+
+ /* Signal skew */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ /* Invert sample clock for i2s */
+ val ^= AIU_CLK_CTRL_LRCLK_INVERT;
+ skew = 1;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ skew = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ val |= FIELD_PREP(AIU_CLK_CTRL_LRCLK_SKEW, skew);
+ snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+ AIU_CLK_CTRL_LRCLK_INVERT |
+ AIU_CLK_CTRL_AOCLK_INVERT |
+ AIU_CLK_CTRL_LRCLK_SKEW,
+ val);
+
+ return 0;
+}
+
+static int aiu_encoder_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
+ unsigned int freq, int dir)
+{
+ struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
+ int ret;
+
+ if (WARN_ON(clk_id != 0))
+ return -EINVAL;
+
+ if (dir == SND_SOC_CLOCK_IN)
+ return 0;
+
+ ret = clk_set_rate(aiu->i2s.clks[MCLK].clk, freq);
+ if (ret)
+ dev_err(dai->dev, "Failed to set sysclk to %uHz", freq);
+
+ return ret;
+}
+
+static const unsigned int hw_channels[] = {2, 8};
+static const struct snd_pcm_hw_constraint_list hw_channel_constraints = {
+ .list = hw_channels,
+ .count = ARRAY_SIZE(hw_channels),
+ .mask = 0,
+};
+
+static int aiu_encoder_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
+ int ret;
+
+ /* Make sure the encoder gets either 2 or 8 channels */
+ ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ &hw_channel_constraints);
+ if (ret) {
+ dev_err(dai->dev, "adding channels constraints failed\n");
+ return ret;
+ }
+
+ ret = clk_bulk_prepare_enable(aiu->i2s.clk_num, aiu->i2s.clks);
+ if (ret)
+ dev_err(dai->dev, "failed to enable i2s clocks\n");
+
+ return ret;
+}
+
+static void aiu_encoder_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct aiu *aiu = snd_soc_component_get_drvdata(dai->component);
+
+ clk_bulk_disable_unprepare(aiu->i2s.clk_num, aiu->i2s.clks);
+}
+
+const struct snd_soc_dai_ops aiu_encoder_i2s_dai_ops = {
+ .hw_params = aiu_encoder_i2s_hw_params,
+ .hw_free = aiu_encoder_i2s_hw_free,
+ .set_fmt = aiu_encoder_i2s_set_fmt,
+ .set_sysclk = aiu_encoder_i2s_set_sysclk,
+ .startup = aiu_encoder_i2s_startup,
+ .shutdown = aiu_encoder_i2s_shutdown,
+};
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 10:12:44 +0000