ASoC: sh: rz-ssi: Add SSI DMAC support

Add SSI DMAC support to RZ/G2L SoC.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20210813091156.10700-4-biju.das.jz@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Biju Das 2021-08-13 10:11:56 +01:00 committed by Mark Brown
parent bed0b1c1e8
commit 26ac471c53
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@ -7,6 +7,7 @@
//
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
@ -86,6 +87,7 @@ struct rz_ssi_stream {
struct rz_ssi_priv *priv;
struct snd_pcm_substream *substream;
int fifo_sample_size; /* sample capacity of SSI FIFO */
int dma_buffer_pos; /* The address for the next DMA descriptor */
int period_counter; /* for keeping track of periods transferred */
int sample_width;
int buffer_pos; /* current frame position in the buffer */
@ -94,6 +96,8 @@ struct rz_ssi_stream {
int uerr_num;
int oerr_num;
struct dma_chan *dma_ch;
int (*transfer)(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm);
};
@ -105,6 +109,7 @@ struct rz_ssi_priv {
struct clk *sfr_clk;
struct clk *clk;
phys_addr_t phys;
int irq_int;
int irq_tx;
int irq_rx;
@ -128,8 +133,11 @@ struct rz_ssi_priv {
bool lrckp_fsync_fall; /* LR clock polarity (SSICR.LRCKP) */
bool bckp_rise; /* Bit clock polarity (SSICR.BCKP) */
bool dma_rt;
};
static void rz_ssi_dma_complete(void *data);
static void rz_ssi_reg_writel(struct rz_ssi_priv *priv, uint reg, u32 data)
{
writel(data, (priv->base + reg));
@ -175,6 +183,11 @@ rz_ssi_stream_get(struct rz_ssi_priv *ssi, struct snd_pcm_substream *substream)
return stream;
}
static inline bool rz_ssi_is_dma_enabled(struct rz_ssi_priv *ssi)
{
return (ssi->playback.dma_ch || ssi->capture.dma_ch);
}
static int rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi,
struct rz_ssi_stream *strm)
{
@ -196,6 +209,7 @@ static int rz_ssi_stream_init(struct rz_ssi_priv *ssi,
strm->substream = substream;
strm->sample_width = samples_to_bytes(runtime, 1);
strm->dma_buffer_pos = 0;
strm->period_counter = 0;
strm->buffer_pos = 0;
@ -297,9 +311,12 @@ static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
ssifcr = rz_ssi_reg_readl(ssi, SSIFCR) & ~0xF;
/* FIFO interrupt thresholds */
rz_ssi_reg_writel(ssi, SSISCR,
SSISCR_TDES(strm->fifo_sample_size / 2 - 1) |
SSISCR_RDFS(0));
if (rz_ssi_is_dma_enabled(ssi))
rz_ssi_reg_writel(ssi, SSISCR, 0);
else
rz_ssi_reg_writel(ssi, SSISCR,
SSISCR_TDES(strm->fifo_sample_size / 2 - 1) |
SSISCR_RDFS(0));
/* enable IRQ */
if (is_play) {
@ -334,6 +351,10 @@ static int rz_ssi_stop(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
/* Disable TX/RX */
rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TEN | SSICR_REN, 0);
/* Cancel all remaining DMA transactions */
if (rz_ssi_is_dma_enabled(ssi))
dmaengine_terminate_async(strm->dma_ch);
/* Disable irqs */
rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TUIEN | SSICR_TOIEN |
SSICR_RUIEN | SSICR_ROIEN, 0);
@ -549,12 +570,143 @@ static irqreturn_t rz_ssi_interrupt(int irq, void *data)
return IRQ_HANDLED;
}
static int rz_ssi_dma_slave_config(struct rz_ssi_priv *ssi,
struct dma_chan *dma_ch, bool is_play)
{
struct dma_slave_config cfg;
memset(&cfg, 0, sizeof(cfg));
cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
cfg.dst_addr = ssi->phys + SSIFTDR;
cfg.src_addr = ssi->phys + SSIFRDR;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
return dmaengine_slave_config(dma_ch, &cfg);
}
static int rz_ssi_dma_transfer(struct rz_ssi_priv *ssi,
struct rz_ssi_stream *strm)
{
struct snd_pcm_substream *substream = strm->substream;
struct dma_async_tx_descriptor *desc;
struct snd_pcm_runtime *runtime;
enum dma_transfer_direction dir;
u32 dma_paddr, dma_size;
int amount;
if (!rz_ssi_stream_is_valid(ssi, strm))
return -EINVAL;
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
/*
* Stream is ending, so do not queue up any more DMA
* transfers otherwise we play partial sound clips
* because we can't shut off the DMA quick enough.
*/
return 0;
dir = rz_ssi_stream_is_play(ssi, substream) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
/* Always transfer 1 period */
amount = runtime->period_size;
/* DMA physical address and size */
dma_paddr = runtime->dma_addr + frames_to_bytes(runtime,
strm->dma_buffer_pos);
dma_size = frames_to_bytes(runtime, amount);
desc = dmaengine_prep_slave_single(strm->dma_ch, dma_paddr, dma_size,
dir,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_err(ssi->dev, "dmaengine_prep_slave_single() fail\n");
return -ENOMEM;
}
desc->callback = rz_ssi_dma_complete;
desc->callback_param = strm;
if (dmaengine_submit(desc) < 0) {
dev_err(ssi->dev, "dmaengine_submit() fail\n");
return -EIO;
}
/* Update DMA pointer */
strm->dma_buffer_pos += amount;
if (strm->dma_buffer_pos >= runtime->buffer_size)
strm->dma_buffer_pos = 0;
/* Start DMA */
dma_async_issue_pending(strm->dma_ch);
return 0;
}
static void rz_ssi_dma_complete(void *data)
{
struct rz_ssi_stream *strm = (struct rz_ssi_stream *)data;
if (!strm->running || !strm->substream || !strm->substream->runtime)
return;
/* Note that next DMA transaction has probably already started */
rz_ssi_pointer_update(strm, strm->substream->runtime->period_size);
/* Queue up another DMA transaction */
rz_ssi_dma_transfer(strm->priv, strm);
}
static void rz_ssi_release_dma_channels(struct rz_ssi_priv *ssi)
{
if (ssi->playback.dma_ch) {
dma_release_channel(ssi->playback.dma_ch);
ssi->playback.dma_ch = NULL;
if (ssi->dma_rt)
ssi->dma_rt = false;
}
if (ssi->capture.dma_ch) {
dma_release_channel(ssi->capture.dma_ch);
ssi->capture.dma_ch = NULL;
}
}
static int rz_ssi_dma_request(struct rz_ssi_priv *ssi, struct device *dev)
{
ssi->playback.dma_ch = dma_request_chan(dev, "tx");
ssi->capture.dma_ch = dma_request_chan(dev, "rx");
if (!ssi->playback.dma_ch && !ssi->capture.dma_ch) {
ssi->playback.dma_ch = dma_request_chan(dev, "rt");
if (!ssi->playback.dma_ch)
goto no_dma;
ssi->dma_rt = true;
}
if (ssi->playback.dma_ch &&
(rz_ssi_dma_slave_config(ssi, ssi->playback.dma_ch, true) < 0))
goto no_dma;
if (ssi->capture.dma_ch &&
(rz_ssi_dma_slave_config(ssi, ssi->capture.dma_ch, false) < 0))
goto no_dma;
return 0;
no_dma:
rz_ssi_release_dma_channels(ssi);
return -ENODEV;
}
static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai);
struct rz_ssi_stream *strm = rz_ssi_stream_get(ssi, substream);
int ret = 0;
int ret = 0, i, num_transfer = 1;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
@ -567,9 +719,29 @@ static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
if (ret)
goto done;
ret = strm->transfer(ssi, strm);
if (ret)
goto done;
if (ssi->dma_rt) {
bool is_playback;
is_playback = rz_ssi_stream_is_play(ssi, substream);
ret = rz_ssi_dma_slave_config(ssi, ssi->playback.dma_ch,
is_playback);
/* Fallback to pio */
if (ret < 0) {
ssi->playback.transfer = rz_ssi_pio_send;
ssi->capture.transfer = rz_ssi_pio_recv;
rz_ssi_release_dma_channels(ssi);
}
}
/* For DMA, queue up multiple DMA descriptors */
if (rz_ssi_is_dma_enabled(ssi))
num_transfer = 4;
for (i = 0; i < num_transfer; i++) {
ret = strm->transfer(ssi, strm);
if (ret)
goto done;
}
ret = rz_ssi_start(ssi, strm);
break;
@ -737,6 +909,7 @@ static int rz_ssi_probe(struct platform_device *pdev)
{
struct rz_ssi_priv *ssi;
struct clk *audio_clk;
struct resource *res;
int ret;
ssi = devm_kzalloc(&pdev->dev, sizeof(*ssi), GFP_KERNEL);
@ -745,10 +918,11 @@ static int rz_ssi_probe(struct platform_device *pdev)
ssi->pdev = pdev;
ssi->dev = &pdev->dev;
ssi->base = devm_platform_ioremap_resource(pdev, 0);
ssi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(ssi->base))
return PTR_ERR(ssi->base);
ssi->phys = res->start;
ssi->clk = devm_clk_get(&pdev->dev, "ssi");
if (IS_ERR(ssi->clk))
return PTR_ERR(ssi->clk);
@ -775,8 +949,18 @@ static int rz_ssi_probe(struct platform_device *pdev)
ssi->audio_mck = ssi->audio_clk_1 ? ssi->audio_clk_1 : ssi->audio_clk_2;
ssi->playback.transfer = rz_ssi_pio_send;
ssi->capture.transfer = rz_ssi_pio_recv;
/* Detect DMA support */
ret = rz_ssi_dma_request(ssi, &pdev->dev);
if (ret < 0) {
dev_warn(&pdev->dev, "DMA not available, using PIO\n");
ssi->playback.transfer = rz_ssi_pio_send;
ssi->capture.transfer = rz_ssi_pio_recv;
} else {
dev_info(&pdev->dev, "DMA enabled");
ssi->playback.transfer = rz_ssi_dma_transfer;
ssi->capture.transfer = rz_ssi_dma_transfer;
}
ssi->playback.priv = ssi;
ssi->capture.priv = ssi;
@ -792,28 +976,32 @@ static int rz_ssi_probe(struct platform_device *pdev)
return dev_err_probe(&pdev->dev, ret,
"irq request error (int_req)\n");
/* Tx and Rx interrupts (pio only) */
ssi->irq_tx = platform_get_irq_byname(pdev, "dma_tx");
if (ssi->irq_tx < 0)
return dev_err_probe(&pdev->dev, -ENODEV,
"Unable to get SSI dma_tx IRQ\n");
if (!rz_ssi_is_dma_enabled(ssi)) {
/* Tx and Rx interrupts (pio only) */
ssi->irq_tx = platform_get_irq_byname(pdev, "dma_tx");
if (ssi->irq_tx < 0)
return dev_err_probe(&pdev->dev, -ENODEV,
"Unable to get SSI dma_tx IRQ\n");
ret = devm_request_irq(&pdev->dev, ssi->irq_tx, &rz_ssi_interrupt, 0,
dev_name(&pdev->dev), ssi);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret,
"irq request error (dma_tx)\n");
ret = devm_request_irq(&pdev->dev, ssi->irq_tx,
&rz_ssi_interrupt, 0,
dev_name(&pdev->dev), ssi);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret,
"irq request error (dma_tx)\n");
ssi->irq_rx = platform_get_irq_byname(pdev, "dma_rx");
if (ssi->irq_rx < 0)
return dev_err_probe(&pdev->dev, -ENODEV,
"Unable to get SSI dma_rx IRQ\n");
ssi->irq_rx = platform_get_irq_byname(pdev, "dma_rx");
if (ssi->irq_rx < 0)
return dev_err_probe(&pdev->dev, -ENODEV,
"Unable to get SSI dma_rx IRQ\n");
ret = devm_request_irq(&pdev->dev, ssi->irq_rx, &rz_ssi_interrupt, 0,
dev_name(&pdev->dev), ssi);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret,
"irq request error (dma_rx)\n");
ret = devm_request_irq(&pdev->dev, ssi->irq_rx,
&rz_ssi_interrupt, 0,
dev_name(&pdev->dev), ssi);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret,
"irq request error (dma_rx)\n");
}
ssi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
if (IS_ERR(ssi->rstc))
@ -829,6 +1017,8 @@ static int rz_ssi_probe(struct platform_device *pdev)
rz_ssi_soc_dai,
ARRAY_SIZE(rz_ssi_soc_dai));
if (ret < 0) {
rz_ssi_release_dma_channels(ssi);
pm_runtime_put(ssi->dev);
pm_runtime_disable(ssi->dev);
reset_control_assert(ssi->rstc);
@ -842,6 +1032,8 @@ static int rz_ssi_remove(struct platform_device *pdev)
{
struct rz_ssi_priv *ssi = dev_get_drvdata(&pdev->dev);
rz_ssi_release_dma_channels(ssi);
pm_runtime_put(ssi->dev);
pm_runtime_disable(ssi->dev);
reset_control_assert(ssi->rstc);