1 files changed, 485 insertions, 0 deletions

diff --git a/sound/soc/bcm/bcm63xx-pcm-whistler.c b/sound/soc/bcm/bcm63xx-pcm-whistler.c
new file mode 100644
index 000000000000..b7a1efc7406e
--- /dev/null
+++ b/sound/soc/bcm/bcm63xx-pcm-whistler.c
@@ -0,0 +1,485 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// linux/sound/bcm/bcm63xx-pcm-whistler.c
+// BCM63xx whistler pcm interface
+// Copyright (c) 2020 Broadcom Corporation
+// Author: Kevin-Ke Li <kevin-ke.li@broadcom.com>
+
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <sound/pcm_params.h>
+#include <linux/regmap.h>
+#include <linux/of_device.h>
+#include <sound/soc.h>
+#include "bcm63xx-i2s.h"
+
+
+struct i2s_dma_desc {
+	unsigned char *dma_area;
+	dma_addr_t dma_addr;
+	unsigned int dma_len;
+};
+
+struct bcm63xx_runtime_data {
+	int dma_len;
+	dma_addr_t dma_addr;
+	dma_addr_t dma_addr_next;
+};
+
+static const struct snd_pcm_hardware bcm63xx_pcm_hardware = {
+	.info = SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_PAUSE |
+		SNDRV_PCM_INFO_RESUME,
+	.formats = SNDRV_PCM_FMTBIT_S32_LE, /* support S32 only */
+	.period_bytes_max = 8192 - 32,
+	.periods_min = 1,
+	.periods_max = PAGE_SIZE/sizeof(struct i2s_dma_desc),
+	.buffer_bytes_max = 128 * 1024,
+	.fifo_size = 32,
+};
+
+static int bcm63xx_pcm_hw_params(struct snd_soc_component *component,
+				 struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params)
+{
+	struct i2s_dma_desc *dma_desc;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+	runtime->dma_bytes = params_buffer_bytes(params);
+
+	dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
+	if (!dma_desc)
+		return -ENOMEM;
+
+	snd_soc_dai_set_dma_data(asoc_rtd_to_cpu(rtd, 0), substream, dma_desc);
+
+	return 0;
+}
+
+static int bcm63xx_pcm_hw_free(struct snd_soc_component *component,
+			struct snd_pcm_substream *substream)
+{
+	struct i2s_dma_desc	*dma_desc;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+
+	dma_desc = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+	kfree(dma_desc);
+	snd_pcm_set_runtime_buffer(substream, NULL);
+
+	return 0;
+}
+
+static int bcm63xx_pcm_trigger(struct snd_soc_component *component,
+			       struct snd_pcm_substream *substream, int cmd)
+{
+	int ret = 0;
+	struct snd_soc_pcm_runtime *rtd;
+	struct bcm_i2s_priv *i2s_priv;
+	struct regmap   *regmap_i2s;
+
+	rtd = substream->private_data;
+	i2s_priv = dev_get_drvdata(asoc_rtd_to_cpu(rtd, 0)->dev);
+	regmap_i2s = i2s_priv->regmap_i2s;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		switch (cmd) {
+		case SNDRV_PCM_TRIGGER_START:
+			regmap_update_bits(regmap_i2s,
+					   I2S_TX_IRQ_EN,
+					   I2S_TX_DESC_OFF_INTR_EN,
+					   I2S_TX_DESC_OFF_INTR_EN);
+			regmap_update_bits(regmap_i2s,
+					   I2S_TX_CFG,
+					   I2S_TX_ENABLE_MASK,
+					   I2S_TX_ENABLE);
+			break;
+		case SNDRV_PCM_TRIGGER_STOP:
+		case SNDRV_PCM_TRIGGER_SUSPEND:
+		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+			regmap_write(regmap_i2s,
+				     I2S_TX_IRQ_EN,
+				     0);
+			regmap_update_bits(regmap_i2s,
+					   I2S_TX_CFG,
+					   I2S_TX_ENABLE_MASK,
+					   0);
+			break;
+		default:
+			ret = -EINVAL;
+		}
+	} else {
+		switch (cmd) {
+		case SNDRV_PCM_TRIGGER_START:
+			regmap_update_bits(regmap_i2s,
+					   I2S_RX_IRQ_EN,
+					   I2S_RX_DESC_OFF_INTR_EN_MSK,
+					   I2S_RX_DESC_OFF_INTR_EN);
+			regmap_update_bits(regmap_i2s,
+					   I2S_RX_CFG,
+					   I2S_RX_ENABLE_MASK,
+					   I2S_RX_ENABLE);
+			break;
+		case SNDRV_PCM_TRIGGER_STOP:
+		case SNDRV_PCM_TRIGGER_SUSPEND:
+		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+			regmap_update_bits(regmap_i2s,
+					   I2S_RX_IRQ_EN,
+					   I2S_RX_DESC_OFF_INTR_EN_MSK,
+					   0);
+			regmap_update_bits(regmap_i2s,
+					   I2S_RX_CFG,
+					   I2S_RX_ENABLE_MASK,
+					   0);
+			break;
+		default:
+			ret = -EINVAL;
+		}
+	}
+	return ret;
+}
+
+static int bcm63xx_pcm_prepare(struct snd_soc_component *component,
+			struct snd_pcm_substream *substream)
+{
+	struct i2s_dma_desc	*dma_desc;
+	struct regmap		*regmap_i2s;
+	struct bcm_i2s_priv	*i2s_priv;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	uint32_t regaddr_desclen, regaddr_descaddr;
+
+	dma_desc = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+	dma_desc->dma_len  = snd_pcm_lib_period_bytes(substream);
+	dma_desc->dma_addr = runtime->dma_addr;
+	dma_desc->dma_area = runtime->dma_area;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		regaddr_desclen = I2S_TX_DESC_IFF_LEN;
+		regaddr_descaddr = I2S_TX_DESC_IFF_ADDR;
+	} else {
+		regaddr_desclen = I2S_RX_DESC_IFF_LEN;
+		regaddr_descaddr = I2S_RX_DESC_IFF_ADDR;
+	}
+
+	i2s_priv = dev_get_drvdata(asoc_rtd_to_cpu(rtd, 0)->dev);
+	regmap_i2s = i2s_priv->regmap_i2s;
+
+	regmap_write(regmap_i2s, regaddr_desclen, dma_desc->dma_len);
+	regmap_write(regmap_i2s, regaddr_descaddr, dma_desc->dma_addr);
+
+	return 0;
+}
+
+static snd_pcm_uframes_t
+bcm63xx_pcm_pointer(struct snd_soc_component *component,
+		struct snd_pcm_substream *substream)
+{
+	snd_pcm_uframes_t x;
+	struct bcm63xx_runtime_data *prtd = substream->runtime->private_data;
+
+	if (!prtd->dma_addr_next)
+		prtd->dma_addr_next = substream->runtime->dma_addr;
+
+	x = bytes_to_frames(substream->runtime,
+		prtd->dma_addr_next - substream->runtime->dma_addr);
+
+	return x == substream->runtime->buffer_size ? 0 : x;
+}
+
+static int bcm63xx_pcm_mmap(struct snd_soc_component *component,
+				struct snd_pcm_substream *substream,
+				struct vm_area_struct *vma)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	return  dma_mmap_wc(substream->pcm->card->dev, vma,
+			    runtime->dma_area,
+			    runtime->dma_addr,
+			    runtime->dma_bytes);
+
+}
+
+static int bcm63xx_pcm_open(struct snd_soc_component *component,
+			struct snd_pcm_substream *substream)
+{
+	int ret = 0;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct bcm63xx_runtime_data *prtd;
+
+	runtime->hw = bcm63xx_pcm_hardware;
+	ret = snd_pcm_hw_constraint_step(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
+	if (ret)
+		goto out;
+
+	ret = snd_pcm_hw_constraint_step(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
+	if (ret)
+		goto out;
+
+	ret = snd_pcm_hw_constraint_integer(runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		goto out;
+
+	ret = -ENOMEM;
+	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+	if (!prtd)
+		goto out;
+
+	runtime->private_data = prtd;
+	return 0;
+out:
+	return ret;
+}
+
+static int bcm63xx_pcm_close(struct snd_soc_component *component,
+			struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct bcm63xx_runtime_data *prtd = runtime->private_data;
+
+	kfree(prtd);
+	return 0;
+}
+
+static irqreturn_t i2s_dma_isr(int irq, void *bcm_i2s_priv)
+{
+	unsigned int availdepth, ifflevel, offlevel, int_status, val_1, val_2;
+	struct bcm63xx_runtime_data *prtd;
+	struct snd_pcm_substream *substream;
+	struct snd_pcm_runtime *runtime;
+	struct regmap *regmap_i2s;
+	struct i2s_dma_desc *dma_desc;
+	struct snd_soc_pcm_runtime *rtd;
+	struct bcm_i2s_priv *i2s_priv;
+
+	i2s_priv = (struct bcm_i2s_priv *)bcm_i2s_priv;
+	regmap_i2s = i2s_priv->regmap_i2s;
+
+	/* rx */
+	regmap_read(regmap_i2s, I2S_RX_IRQ_CTL, &int_status);
+
+	if (int_status & I2S_RX_DESC_OFF_INTR_EN_MSK) {
+		substream = i2s_priv->capture_substream;
+		runtime = substream->runtime;
+		rtd = substream->private_data;
+		prtd = runtime->private_data;
+		dma_desc = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+
+		offlevel = (int_status & I2S_RX_DESC_OFF_LEVEL_MASK) >>
+			   I2S_RX_DESC_OFF_LEVEL_SHIFT;
+		while (offlevel) {
+			regmap_read(regmap_i2s, I2S_RX_DESC_OFF_ADDR, &val_1);
+			regmap_read(regmap_i2s, I2S_RX_DESC_OFF_LEN, &val_2);
+			offlevel--;
+		}
+		prtd->dma_addr_next = val_1 + val_2;
+		ifflevel = (int_status & I2S_RX_DESC_IFF_LEVEL_MASK) >>
+			   I2S_RX_DESC_IFF_LEVEL_SHIFT;
+
+		availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;
+		while (availdepth) {
+			dma_desc->dma_addr +=
+					snd_pcm_lib_period_bytes(substream);
+			dma_desc->dma_area +=
+					snd_pcm_lib_period_bytes(substream);
+			if (dma_desc->dma_addr - runtime->dma_addr >=
+						runtime->dma_bytes) {
+				dma_desc->dma_addr = runtime->dma_addr;
+				dma_desc->dma_area = runtime->dma_area;
+			}
+
+			prtd->dma_addr = dma_desc->dma_addr;
+			regmap_write(regmap_i2s, I2S_RX_DESC_IFF_LEN,
+				     snd_pcm_lib_period_bytes(substream));
+			regmap_write(regmap_i2s, I2S_RX_DESC_IFF_ADDR,
+				     dma_desc->dma_addr);
+			availdepth--;
+		}
+
+		snd_pcm_period_elapsed(substream);
+
+		/* Clear interrupt by writing 0 */
+		regmap_update_bits(regmap_i2s, I2S_RX_IRQ_CTL,
+				   I2S_RX_INTR_MASK, 0);
+	}
+
+	/* tx */
+	regmap_read(regmap_i2s, I2S_TX_IRQ_CTL, &int_status);
+
+	if (int_status & I2S_TX_DESC_OFF_INTR_EN_MSK) {
+		substream = i2s_priv->play_substream;
+		runtime = substream->runtime;
+		rtd = substream->private_data;
+		prtd = runtime->private_data;
+		dma_desc = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+
+		offlevel = (int_status & I2S_TX_DESC_OFF_LEVEL_MASK) >>
+			   I2S_TX_DESC_OFF_LEVEL_SHIFT;
+		while (offlevel) {
+			regmap_read(regmap_i2s, I2S_TX_DESC_OFF_ADDR, &val_1);
+			regmap_read(regmap_i2s, I2S_TX_DESC_OFF_LEN,  &val_2);
+			prtd->dma_addr_next = val_1 + val_2;
+			offlevel--;
+		}
+
+		ifflevel = (int_status & I2S_TX_DESC_IFF_LEVEL_MASK) >>
+			I2S_TX_DESC_IFF_LEVEL_SHIFT;
+		availdepth = I2S_DESC_FIFO_DEPTH - ifflevel;
+
+		while (availdepth) {
+			dma_desc->dma_addr +=
+					snd_pcm_lib_period_bytes(substream);
+			dma_desc->dma_area +=
+					snd_pcm_lib_period_bytes(substream);
+
+			if (dma_desc->dma_addr - runtime->dma_addr >=
+							runtime->dma_bytes) {
+				dma_desc->dma_addr = runtime->dma_addr;
+				dma_desc->dma_area = runtime->dma_area;
+			}
+
+			prtd->dma_addr = dma_desc->dma_addr;
+			regmap_write(regmap_i2s, I2S_TX_DESC_IFF_LEN,
+				snd_pcm_lib_period_bytes(substream));
+			regmap_write(regmap_i2s, I2S_TX_DESC_IFF_ADDR,
+					dma_desc->dma_addr);
+			availdepth--;
+		}
+
+		snd_pcm_period_elapsed(substream);
+
+		/* Clear interrupt by writing 0 */
+		regmap_update_bits(regmap_i2s, I2S_TX_IRQ_CTL,
+				   I2S_TX_INTR_MASK, 0);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int bcm63xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+	size_t size = bcm63xx_pcm_hardware.buffer_bytes_max;
+
+	buf->dev.type = SNDRV_DMA_TYPE_DEV;
+	buf->dev.dev = pcm->card->dev;
+	buf->private_data = NULL;
+
+	buf->area = dma_alloc_wc(pcm->card->dev,
+				 size, &buf->addr,
+				 GFP_KERNEL);
+	if (!buf->area)
+		return -ENOMEM;
+	buf->bytes = size;
+	return 0;
+}
+
+static int bcm63xx_soc_pcm_new(struct snd_soc_component *component,
+		struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_pcm *pcm = rtd->pcm;
+	struct bcm_i2s_priv *i2s_priv;
+	int ret;
+
+	i2s_priv = dev_get_drvdata(asoc_rtd_to_cpu(rtd, 0)->dev);
+
+	of_dma_configure(pcm->card->dev, pcm->card->dev->of_node, 1);
+
+	ret = dma_coerce_mask_and_coherent(pcm->card->dev, DMA_BIT_MASK(32));
+	if (ret)
+		goto out;
+
+	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+		ret = bcm63xx_pcm_preallocate_dma_buffer(pcm,
+						 SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			goto out;
+
+		i2s_priv->play_substream =
+			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+	}
+
+	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+		ret = bcm63xx_pcm_preallocate_dma_buffer(pcm,
+					SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			goto out;
+		i2s_priv->capture_substream =
+			pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
+	}
+
+out:
+	return ret;
+}
+
+static void bcm63xx_pcm_free_dma_buffers(struct snd_soc_component *component,
+			 struct snd_pcm *pcm)
+{
+	int stream;
+	struct snd_dma_buffer *buf;
+	struct snd_pcm_substream *substream;
+
+	for (stream = 0; stream < 2; stream++) {
+		substream = pcm->streams[stream].substream;
+		if (!substream)
+			continue;
+		buf = &substream->dma_buffer;
+		if (!buf->area)
+			continue;
+		dma_free_wc(pcm->card->dev, buf->bytes,
+					buf->area, buf->addr);
+		buf->area = NULL;
+	}
+}
+
+static const struct snd_soc_component_driver bcm63xx_soc_platform = {
+	.open = bcm63xx_pcm_open,
+	.close = bcm63xx_pcm_close,
+	.hw_params = bcm63xx_pcm_hw_params,
+	.hw_free = bcm63xx_pcm_hw_free,
+	.prepare = bcm63xx_pcm_prepare,
+	.trigger = bcm63xx_pcm_trigger,
+	.pointer = bcm63xx_pcm_pointer,
+	.mmap = bcm63xx_pcm_mmap,
+	.pcm_construct = bcm63xx_soc_pcm_new,
+	.pcm_destruct = bcm63xx_pcm_free_dma_buffers,
+};
+
+int bcm63xx_soc_platform_probe(struct platform_device *pdev,
+			       struct bcm_i2s_priv *i2s_priv)
+{
+	int ret;
+
+	i2s_priv->r_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!i2s_priv->r_irq) {
+		dev_err(&pdev->dev, "Unable to get register irq resource.\n");
+		return -ENODEV;
+	}
+
+	ret = devm_request_irq(&pdev->dev, i2s_priv->r_irq->start, i2s_dma_isr,
+			i2s_priv->r_irq->flags, "i2s_dma", (void *)i2s_priv);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"i2s_init: failed to request interrupt.ret=%d\n", ret);
+		return ret;
+	}
+
+	return devm_snd_soc_register_component(&pdev->dev,
+					&bcm63xx_soc_platform, NULL, 0);
+}
+
+int bcm63xx_soc_platform_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+MODULE_AUTHOR("Kevin,Li <kevin-ke.li@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom DSL XPON ASOC PCM Interface");
+MODULE_LICENSE("GPL v2");