ASoC: meson: aiu: add i2s and spdif support

Add support for the i2s and spdif audio outputs (AIU) found in the
amlogic Gx SoC family

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20200213155159.3235792-5-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 153 insertions, 0 deletions

diff --git a/sound/soc/meson/aiu-fifo-i2s.c b/sound/soc/meson/aiu-fifo-i2s.c
new file mode 100644
index 000000000000..9a5271ce80fe
--- /dev/null
+++ b/sound/soc/meson/aiu-fifo-i2s.c
@@ -0,0 +1,153 @@
+// 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"
+#include "aiu-fifo.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_MEM_I2S_MASKS_IRQ_BLOCK	GENMASK(31, 16)
+#define AIU_MEM_I2S_CONTROL_MODE_16BIT	BIT(6)
+#define AIU_MEM_I2S_BUF_CNTL_INIT	BIT(0)
+#define AIU_RST_SOFT_I2S_FAST		BIT(0)
+
+#define AIU_FIFO_I2S_BLOCK		256
+
+static struct snd_pcm_hardware fifo_i2s_pcm = {
+	.info = (SNDRV_PCM_INFO_INTERLEAVED |
+		 SNDRV_PCM_INFO_MMAP |
+		 SNDRV_PCM_INFO_MMAP_VALID |
+		 SNDRV_PCM_INFO_PAUSE),
+	.formats = AIU_FORMATS,
+	.rate_min = 5512,
+	.rate_max = 192000,
+	.channels_min = 2,
+	.channels_max = 8,
+	.period_bytes_min = AIU_FIFO_I2S_BLOCK,
+	.period_bytes_max = AIU_FIFO_I2S_BLOCK * USHRT_MAX,
+	.periods_min = 2,
+	.periods_max = UINT_MAX,
+
+	/* No real justification for this */
+	.buffer_bytes_max = 1 * 1024 * 1024,
+};
+
+static int aiu_fifo_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+				struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	unsigned int val;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		snd_soc_component_write(component, AIU_RST_SOFT,
+					AIU_RST_SOFT_I2S_FAST);
+		snd_soc_component_read(component, AIU_I2S_SYNC, &val);
+		break;
+	}
+
+	return aiu_fifo_trigger(substream, cmd, dai);
+}
+
+static int aiu_fifo_i2s_prepare(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	int ret;
+
+	ret = aiu_fifo_prepare(substream, dai);
+	if (ret)
+		return ret;
+
+	snd_soc_component_update_bits(component,
+				      AIU_MEM_I2S_BUF_CNTL,
+				      AIU_MEM_I2S_BUF_CNTL_INIT,
+				      AIU_MEM_I2S_BUF_CNTL_INIT);
+	snd_soc_component_update_bits(component,
+				      AIU_MEM_I2S_BUF_CNTL,
+				      AIU_MEM_I2S_BUF_CNTL_INIT, 0);
+
+	return 0;
+}
+
+static int aiu_fifo_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;
+	struct aiu_fifo *fifo = dai->playback_dma_data;
+	unsigned int val;
+	int ret;
+
+	ret = aiu_fifo_hw_params(substream, params, dai);
+	if (ret)
+		return ret;
+
+	switch (params_physical_width(params)) {
+	case 16:
+		val = AIU_MEM_I2S_CONTROL_MODE_16BIT;
+		break;
+	case 32:
+		val = 0;
+		break;
+	default:
+		dev_err(dai->dev, "Unsupported physical width %u\n",
+			params_physical_width(params));
+		return -EINVAL;
+	}
+
+	snd_soc_component_update_bits(component, AIU_MEM_I2S_CONTROL,
+				      AIU_MEM_I2S_CONTROL_MODE_16BIT,
+				      val);
+
+	/* Setup the irq periodicity */
+	val = params_period_bytes(params) / fifo->fifo_block;
+	val = FIELD_PREP(AIU_MEM_I2S_MASKS_IRQ_BLOCK, val);
+	snd_soc_component_update_bits(component, AIU_MEM_I2S_MASKS,
+				      AIU_MEM_I2S_MASKS_IRQ_BLOCK, val);
+
+	return 0;
+}
+
+const struct snd_soc_dai_ops aiu_fifo_i2s_dai_ops = {
+	.trigger	= aiu_fifo_i2s_trigger,
+	.prepare	= aiu_fifo_i2s_prepare,
+	.hw_params	= aiu_fifo_i2s_hw_params,
+	.hw_free	= aiu_fifo_hw_free,
+	.startup	= aiu_fifo_startup,
+	.shutdown	= aiu_fifo_shutdown,
+};
+
+int aiu_fifo_i2s_dai_probe(struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct aiu *aiu = snd_soc_component_get_drvdata(component);
+	struct aiu_fifo *fifo;
+	int ret;
+
+	ret = aiu_fifo_dai_probe(dai);
+	if (ret)
+		return ret;
+
+	fifo = dai->playback_dma_data;
+
+	fifo->pcm = &fifo_i2s_pcm;
+	fifo->mem_offset = AIU_MEM_I2S_START;
+	fifo->fifo_block = AIU_FIFO_I2S_BLOCK;
+	fifo->pclk = aiu->i2s.clks[PCLK].clk;
+	fifo->irq = aiu->i2s.irq;
+
+	return 0;
+}