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-rw-r--r--sound/soc/bcm/bcm63xx-pcm-whistler.c485
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 000000000..7ec8559d5
--- /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 = asoc_substream_to_rtd(substream);
+ 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 = asoc_substream_to_rtd(substream);
+
+ 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 = asoc_substream_to_rtd(substream);
+ 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 = asoc_substream_to_rtd(substream);
+ 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 = asoc_substream_to_rtd(substream);
+ 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 = asoc_substream_to_rtd(substream);
+ 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 00:04:15 +0000