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linux/sound/soc/bcm/bcm63xx-pcm-whistler.c
Lad Prabhakar 5de035c270
ASoC: bcm: Use platform_get_irq() to get the interrupt 
platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq().

While at it also drop "r_irq" member from struct bcm_i2s_priv as there
are no users of it.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20211221170100.27423-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-12-21 18:05:43 +00:00

415 lines
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// 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/irq.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);
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);
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_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_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)
return ret;
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
i2s_priv->play_substream =
pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
i2s_priv->capture_substream =
pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
pcm->card->dev,
bcm63xx_pcm_hardware.buffer_bytes_max);
}
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,
.pcm_construct = bcm63xx_soc_pcm_new,
};
int bcm63xx_soc_platform_probe(struct platform_device *pdev,
struct bcm_i2s_priv *i2s_priv)
{
int ret;
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
ret = devm_request_irq(&pdev->dev, ret, i2s_dma_isr,
irq_get_trigger_type(ret), "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");
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