linux/sound/soc/bcm/bcm63xx-pcm-whistler.c
Takashi Iwai 76385a665f
ASoC: bcm: Fix pointer cast warning
The NULL check can be done gracefully without cast.  It fixes a
compile warning like:
  sound/soc/bcm/bcm63xx-pcm-whistler.c:184:6: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]

Fixes: 88eb404ccc ("ASoC: brcm: Add DSL/PON SoC audio driver")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20200330135645.9707-1-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>
2020-03-30 15:32:34 +01:00

486 lines
13 KiB
C

// 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");