[alsa-devel] [PATCH 2/2] ASoC: atmel-pcm: add dma support
Bo Shen
voice.shen at atmel.com
Tue Nov 20 09:38:18 CET 2012
Change xfer_size name to apply to PDC and DMA aswell.
Specify overrun bit in interrupt mask.
Add dmaengine specific routines and replace PDC ones in
pcm_ops if appropriate.
Uses cyclic DMA API for queuing samples.
Signed-off-by: Nicolas Ferre <nicolas.ferre at atmel.com>
[voice.shen at atmel.com: align with mainline kernel, address Vinod's comments]
Signed-off-by: Bo Shen <voice.shen at atmel.com>
---
sound/soc/atmel/atmel-pcm.c | 369 +++++++++++++++++++++++++++++++++++----
sound/soc/atmel/atmel-pcm.h | 4 +-
sound/soc/atmel/atmel_ssc_dai.c | 30 ++--
3 files changed, 358 insertions(+), 45 deletions(-)
diff --git a/sound/soc/atmel/atmel-pcm.c b/sound/soc/atmel/atmel-pcm.c
index 40e17d1..c9d1246 100644
--- a/sound/soc/atmel/atmel-pcm.c
+++ b/sound/soc/atmel/atmel-pcm.c
@@ -37,7 +37,9 @@
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/atmel_pdc.h>
+#include <linux/dmaengine.h>
#include <linux/atmel-ssc.h>
+#include <linux/platform_data/dma-atmel.h>
#include <sound/core.h>
#include <sound/pcm.h>
@@ -53,7 +55,7 @@
/* TODO: These values were taken from the AT91 platform driver, check
* them against real values for AT32
*/
-static const struct snd_pcm_hardware atmel_pcm_hardware = {
+static const struct snd_pcm_hardware atmel_pcm_pdc_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
@@ -66,6 +68,22 @@ static const struct snd_pcm_hardware atmel_pcm_hardware = {
.buffer_bytes_max = 32 * 1024,
};
+static const struct snd_pcm_hardware atmel_pcm_dma_hardware = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_RESUME |
+ SNDRV_PCM_INFO_PAUSE,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .period_bytes_min = 256, /* lighting DMA overhead */
+ .period_bytes_max = 2 * 0xffff, /* if 2 bytes format */
+ .periods_min = 8,
+ .periods_max = 1024, /* no limit */
+ .buffer_bytes_max = 64 * 1024, /* 64KiB */
+};
+
+static const struct snd_pcm_hardware *atmel_pcm_hardware;
+
/*--------------------------------------------------------------------------*\
* Data types
@@ -77,12 +95,19 @@ struct atmel_runtime_data {
size_t period_size;
dma_addr_t period_ptr; /* physical address of next period */
+ int periods; /* period index of period_ptr */
/* PDC register save */
u32 pdc_xpr_save;
u32 pdc_xcr_save;
u32 pdc_xnpr_save;
u32 pdc_xncr_save;
+
+ /* dmaengine data */
+ struct at_dma_slave atslave;
+ struct dma_async_tx_descriptor *desc;
+ dma_cookie_t cookie;
+ struct dma_chan *dma_chan;
};
@@ -94,7 +119,7 @@ static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
{
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
- size_t size = atmel_pcm_hardware.buffer_bytes_max;
+ size_t size = atmel_pcm_hardware->buffer_bytes_max;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
@@ -116,7 +141,7 @@ static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
/*--------------------------------------------------------------------------*\
* ISR
\*--------------------------------------------------------------------------*/
-static void atmel_pcm_dma_irq(u32 ssc_sr,
+static void atmel_pcm_pdc_irq(u32 ssc_sr,
struct snd_pcm_substream *substream)
{
struct atmel_runtime_data *prtd = substream->runtime->private_data;
@@ -142,7 +167,7 @@ static void atmel_pcm_dma_irq(u32 ssc_sr,
ssc_writex(params->ssc->regs, params->pdc->xpr,
prtd->period_ptr);
ssc_writex(params->ssc->regs, params->pdc->xcr,
- prtd->period_size / params->pdc_xfer_size);
+ prtd->period_size / params->data_xfer_size);
ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
params->mask->pdc_enable);
}
@@ -156,12 +181,152 @@ static void atmel_pcm_dma_irq(u32 ssc_sr,
ssc_writex(params->ssc->regs, params->pdc->xnpr,
prtd->period_ptr);
ssc_writex(params->ssc->regs, params->pdc->xncr,
- prtd->period_size / params->pdc_xfer_size);
+ prtd->period_size / params->data_xfer_size);
+ }
+
+ snd_pcm_period_elapsed(substream);
+}
+
+/**
+ * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
+ *
+ * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
+ * check if any overrun occured.
+ */
+static void atmel_pcm_dma_irq(u32 ssc_sr,
+ struct snd_pcm_substream *substream)
+{
+ struct atmel_runtime_data *prtd = substream->runtime->private_data;
+ struct atmel_pcm_dma_params *params = prtd->params;
+
+ if (ssc_sr & params->mask->ssc_error) {
+ if (snd_pcm_running(substream))
+ pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
+ substream->stream == SNDRV_PCM_STREAM_PLAYBACK
+ ? "underrun" : "overrun", params->name,
+ ssc_sr);
+
+ /* stop RX and capture: will be enabled again at restart */
+ ssc_writex(params->ssc->regs, SSC_CR,
+ params->mask->ssc_disable);
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+
+ /* now drain RHR and read status to remove xrun condition */
+ ssc_readx(params->ssc->regs, SSC_RHR);
+ ssc_readx(params->ssc->regs, SSC_SR);
}
+}
+
+/*--------------------------------------------------------------------------*\
+ * DMAENGINE operations
+\*--------------------------------------------------------------------------*/
+static void audio_dma_irq(void *data)
+{
+ struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct atmel_runtime_data *prtd = runtime->private_data;
+
+ prtd->period_ptr += prtd->period_size;
+ if (prtd->period_ptr >= prtd->dma_buffer_end)
+ prtd->period_ptr = prtd->dma_buffer;
snd_pcm_period_elapsed(substream);
}
+static bool filter(struct dma_chan *chan, void *slave)
+{
+ struct at_dma_slave *sl = slave;
+
+ if (sl->dma_dev == chan->device->dev) {
+ chan->private = sl;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct atmel_runtime_data *prtd = runtime->private_data;
+ struct ssc_device *ssc = prtd->params->ssc;
+ struct dma_slave_config slave_config;
+ enum dma_slave_buswidth buswidth;
+ struct at_dma_slave *sdata = NULL;
+ int ret;
+
+ if (ssc->pdev)
+ sdata = ssc->pdev->dev.platform_data;
+
+ if (sdata && sdata->dma_dev) {
+ dma_cap_mask_t mask;
+
+ /* Try to grab a DMA channel */
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_CYCLIC, mask);
+ prtd->dma_chan = dma_request_channel(mask, filter, sdata);
+ if (!prtd->dma_chan) {
+ pr_err("atmel-pcm: DMA channel not available\n");
+ return -EBUSY;
+ }
+ } else {
+ return -EINVAL;
+ }
+
+ if (prtd->desc)
+ dmaengine_terminate_all(prtd->dma_chan);
+
+ switch (prtd->params->data_xfer_size) {
+ case 1:
+ buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ break;
+ case 2:
+ buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+ case 4:
+ buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ break;
+ default:
+ goto err;
+ }
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ slave_config.direction = DMA_MEM_TO_DEV;
+ slave_config.dst_addr_width = buswidth;
+ slave_config.dst_addr = (dma_addr_t)ssc->phybase + SSC_THR;
+ slave_config.dst_maxburst = buswidth;
+ } else {
+ slave_config.direction = DMA_DEV_TO_MEM;
+ slave_config.src_addr_width = buswidth;
+ slave_config.src_addr = (dma_addr_t)ssc->phybase + SSC_RHR;
+ slave_config.src_maxburst = buswidth;
+ }
+ slave_config.device_fc = false;
+
+ if (dmaengine_slave_config(prtd->dma_chan, &slave_config)) {
+ pr_err("atmel-pcm: failed to configure dma channel\n");
+ ret = -EBUSY;
+ goto err;
+ }
+
+ prtd->desc = dmaengine_prep_dma_cyclic(prtd->dma_chan,
+ prtd->dma_buffer,
+ prtd->period_size * prtd->periods,
+ prtd->period_size,
+ substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE,
+ 0);
+
+ prtd->desc->callback = audio_dma_irq;
+ prtd->desc->callback_param = substream;
+
+ return 0;
+
+err:
+ dma_release_channel(prtd->dma_chan);
+ return ret;
+}
/*--------------------------------------------------------------------------*\
* PCM operations
@@ -172,6 +337,7 @@ static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_runtime *runtime = substream->runtime;
struct atmel_runtime_data *prtd = runtime->private_data;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ int ret;
/* this may get called several times by oss emulation
* with different params */
@@ -180,18 +346,33 @@ static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
runtime->dma_bytes = params_buffer_bytes(params);
prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
- prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
prtd->dma_buffer = runtime->dma_addr;
prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
prtd->period_size = params_period_bytes(params);
+ prtd->periods = params_periods(params);
+
+ if (prtd->params->ssc->pdata->use_dma) {
+ ret = atmel_pcm_configure_dma(substream, params);
+ if (ret) {
+ pr_err("atmel-pcm: failed to configure dma");
+ return ret;
+ }
+
+ prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
+ } else {
+ prtd->params->dma_intr_handler = atmel_pcm_pdc_irq;
+ }
pr_debug("atmel-pcm: "
- "hw_params: DMA for %s initialized "
+ "hw_params: %s%s for %s initialized "
"(dma_bytes=%u, period_size=%u)\n",
+ prtd->dma_chan ? "DMA " : "PDC",
+ prtd->dma_chan ? dma_chan_name(prtd->dma_chan) : "",
prtd->params->name,
runtime->dma_bytes,
prtd->period_size);
+
return 0;
}
@@ -201,15 +382,30 @@ static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
struct atmel_pcm_dma_params *params = prtd->params;
if (params != NULL) {
- ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
- params->mask->pdc_disable);
+ if (params->ssc->pdata->use_dma) {
+ struct dma_chan *chan = prtd->dma_chan;
+
+ if (chan) {
+ dmaengine_terminate_all(chan);
+ prtd->cookie = 0;
+ prtd->desc = NULL;
+ dma_release_channel(chan);
+ prtd->dma_chan = NULL;
+ }
+ } else {
+ ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
+ params->mask->pdc_disable);
+ }
prtd->params->dma_intr_handler = NULL;
}
return 0;
}
-static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
+/*--------------------------------------------------------------------------*\
+ * PCM callbacks using PDC
+\*--------------------------------------------------------------------------*/
+static int atmel_pcm_pdc_prepare(struct snd_pcm_substream *substream)
{
struct atmel_runtime_data *prtd = substream->runtime->private_data;
struct atmel_pcm_dma_params *params = prtd->params;
@@ -221,7 +417,7 @@ static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
return 0;
}
-static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
+static int atmel_pcm_pdc_trigger(struct snd_pcm_substream *substream,
int cmd)
{
struct snd_pcm_runtime *rtd = substream->runtime;
@@ -240,13 +436,13 @@ static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
ssc_writex(params->ssc->regs, params->pdc->xpr,
prtd->period_ptr);
ssc_writex(params->ssc->regs, params->pdc->xcr,
- prtd->period_size / params->pdc_xfer_size);
+ prtd->period_size / params->data_xfer_size);
prtd->period_ptr += prtd->period_size;
ssc_writex(params->ssc->regs, params->pdc->xnpr,
prtd->period_ptr);
ssc_writex(params->ssc->regs, params->pdc->xncr,
- prtd->period_size / params->pdc_xfer_size);
+ prtd->period_size / params->data_xfer_size);
pr_debug("atmel-pcm: trigger: "
"period_ptr=%lx, xpr=%u, "
@@ -264,7 +460,7 @@ static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
pr_debug("sr=%u imr=%u\n",
ssc_readx(params->ssc->regs, SSC_SR),
- ssc_readx(params->ssc->regs, SSC_IER));
+ ssc_readx(params->ssc->regs, SSC_IMR));
break; /* SNDRV_PCM_TRIGGER_START */
case SNDRV_PCM_TRIGGER_STOP:
@@ -287,7 +483,7 @@ static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
return ret;
}
-static snd_pcm_uframes_t atmel_pcm_pointer(
+static snd_pcm_uframes_t atmel_pcm_pdc_pointer(
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
@@ -305,13 +501,102 @@ static snd_pcm_uframes_t atmel_pcm_pointer(
return x;
}
+/*--------------------------------------------------------------------------*\
+ * PCM callbacks using DMAENGINE
+\*--------------------------------------------------------------------------*/
+static int atmel_pcm_dma_prepare(struct snd_pcm_substream *substream)
+{
+ struct atmel_runtime_data *prtd = substream->runtime->private_data;
+ struct atmel_pcm_dma_params *params = prtd->params;
+
+ ssc_writex(params->ssc->regs, SSC_IDR, params->mask->ssc_error);
+ return 0;
+}
+
+static int atmel_pcm_dma_trigger(struct snd_pcm_substream *substream,
+ int cmd)
+{
+ struct snd_pcm_runtime *rtd = substream->runtime;
+ struct atmel_runtime_data *prtd = rtd->private_data;
+ struct atmel_pcm_dma_params *params = prtd->params;
+ dma_cookie_t cookie;
+ int ret = 0;
+
+ pr_debug("atmel-pcm: trigger %d: buffer_size = %ld, "
+ "dma_area = %p, dma_bytes = %u\n",
+ cmd, rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+
+ if (prtd->cookie < DMA_MIN_COOKIE) {
+ cookie = dmaengine_submit(prtd->desc);
+ prtd->cookie = cookie;
+ prtd->period_ptr = prtd->dma_buffer;
+ }
+
+ pr_debug("atmel-pcm: trigger: start sr=0x%08x imr=0x%08u\n",
+ ssc_readx(params->ssc->regs, SSC_SR),
+ ssc_readx(params->ssc->regs, SSC_IMR));
+
+ /* fallback */
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ dmaengine_resume(prtd->dma_chan);
+
+ /* It not already done or comming from xrun state */
+ ssc_readx(params->ssc->regs, SSC_SR);
+ ssc_writex(params->ssc->regs, SSC_IER, params->mask->ssc_error);
+ ssc_writex(params->ssc->regs, SSC_CR, params->mask->ssc_enable);
+
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ pr_debug("atmel-pcm: trigger: stop cmd = %d\n", cmd);
+
+ ssc_writex(params->ssc->regs, SSC_IDR, params->mask->ssc_error);
+
+ /* fallback */
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ dmaengine_pause(prtd->dma_chan);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static snd_pcm_uframes_t atmel_pcm_dma_pointer(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct atmel_runtime_data *prtd = runtime->private_data;
+ snd_pcm_uframes_t x;
+
+ dev_vdbg(substream->pcm->card->dev, "%s: 0x%08x %ld\n",
+ __func__, prtd->period_ptr,
+ bytes_to_frames(runtime, prtd->period_ptr - prtd->dma_buffer));
+
+ x = bytes_to_frames(runtime, prtd->period_ptr - prtd->dma_buffer);
+
+ if (x >= runtime->buffer_size)
+ x = 0;
+
+ return x;
+}
+
+
+/*--------------------------------------------------------------------------*\
+ * PCM open/close/mmap
+\*--------------------------------------------------------------------------*/
static int atmel_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct atmel_runtime_data *prtd;
int ret = 0;
- snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
+ snd_soc_set_runtime_hwparams(substream, atmel_pcm_hardware);
/* ensure that buffer size is a multiple of period size */
ret = snd_pcm_hw_constraint_integer(runtime,
@@ -352,9 +637,9 @@ static struct snd_pcm_ops atmel_pcm_ops = {
.ioctl = snd_pcm_lib_ioctl,
.hw_params = atmel_pcm_hw_params,
.hw_free = atmel_pcm_hw_free,
- .prepare = atmel_pcm_prepare,
- .trigger = atmel_pcm_trigger,
- .pointer = atmel_pcm_pointer,
+ .prepare = atmel_pcm_pdc_prepare,
+ .trigger = atmel_pcm_pdc_trigger,
+ .pointer = atmel_pcm_pdc_pointer,
.mmap = atmel_pcm_mmap,
};
@@ -420,21 +705,25 @@ static int atmel_pcm_suspend(struct snd_soc_dai *dai)
struct snd_pcm_runtime *runtime = dai->runtime;
struct atmel_runtime_data *prtd;
struct atmel_pcm_dma_params *params;
+ struct ssc_device *ssc;
if (!runtime)
return 0;
prtd = runtime->private_data;
params = prtd->params;
+ ssc = params->ssc;
- /* disable the PDC and save the PDC registers */
+ if (!ssc->pdata->use_dma) {
+ /* disable the PDC and save the PDC registers */
- ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
+ ssc_writel(ssc->regs, PDC_PTCR, params->mask->pdc_disable);
- prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
- prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
- prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
- prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
+ prtd->pdc_xpr_save = ssc_readx(ssc->regs, params->pdc->xpr);
+ prtd->pdc_xcr_save = ssc_readx(ssc->regs, params->pdc->xcr);
+ prtd->pdc_xnpr_save = ssc_readx(ssc->regs, params->pdc->xnpr);
+ prtd->pdc_xncr_save = ssc_readx(ssc->regs, params->pdc->xncr);
+ }
return 0;
}
@@ -444,20 +733,25 @@ static int atmel_pcm_resume(struct snd_soc_dai *dai)
struct snd_pcm_runtime *runtime = dai->runtime;
struct atmel_runtime_data *prtd;
struct atmel_pcm_dma_params *params;
+ struct ssc_device *ssc;
if (!runtime)
return 0;
prtd = runtime->private_data;
params = prtd->params;
+ ssc = params->ssc;
- /* restore the PDC registers and enable the PDC */
- ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
- ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
- ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
- ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
+ if (!ssc->pdata->use_dma) {
+ /* restore the PDC registers and enable the PDC */
+ ssc_writex(ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
+ ssc_writex(ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
+ ssc_writex(ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
+ ssc_writex(ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
+
+ ssc_writel(ssc->regs, PDC_PTCR, params->mask->pdc_enable);
+ }
- ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
return 0;
}
#else
@@ -475,6 +769,19 @@ static struct snd_soc_platform_driver atmel_soc_platform = {
int atmel_pcm_platform_register(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct ssc_device *ssc = platform_get_drvdata(pdev);
+
+ if (ssc->pdata->use_dma) {
+ atmel_pcm_ops.prepare = atmel_pcm_dma_prepare;
+ atmel_pcm_ops.trigger = atmel_pcm_dma_trigger;
+ atmel_pcm_ops.pointer = atmel_pcm_dma_pointer;
+
+ atmel_pcm_hardware = &atmel_pcm_dma_hardware;
+ } else {
+ atmel_pcm_hardware = &atmel_pcm_pdc_hardware;
+ }
+
return snd_soc_register_platform(dev, &atmel_soc_platform);
}
EXPORT_SYMBOL(atmel_pcm_platform_register);
diff --git a/sound/soc/atmel/atmel-pcm.h b/sound/soc/atmel/atmel-pcm.h
index e6d67b3..261331d 100644
--- a/sound/soc/atmel/atmel-pcm.h
+++ b/sound/soc/atmel/atmel-pcm.h
@@ -50,6 +50,7 @@ struct atmel_pdc_regs {
struct atmel_ssc_mask {
u32 ssc_enable; /* SSC recv/trans enable */
u32 ssc_disable; /* SSC recv/trans disable */
+ u32 ssc_error; /* SSC error conditions */
u32 ssc_endx; /* SSC ENDTX or ENDRX */
u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */
u32 pdc_enable; /* PDC recv/trans enable */
@@ -66,7 +67,8 @@ struct atmel_ssc_mask {
*/
struct atmel_pcm_dma_params {
char *name; /* stream identifier */
- int pdc_xfer_size; /* PDC counter increment in bytes */
+ int data_xfer_size; /* PDC counter increment in bytes,
+ DMA data transfer size in bytes */
struct ssc_device *ssc; /* SSC device for stream */
struct atmel_pdc_regs *pdc; /* PDC receive or transmit registers */
struct atmel_ssc_mask *mask; /* SSC & PDC status bits */
diff --git a/sound/soc/atmel/atmel_ssc_dai.c b/sound/soc/atmel/atmel_ssc_dai.c
index 7932c05..a87d6d8 100644
--- a/sound/soc/atmel/atmel_ssc_dai.c
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -82,6 +82,7 @@ static struct atmel_ssc_mask ssc_tx_mask = {
static struct atmel_ssc_mask ssc_rx_mask = {
.ssc_enable = SSC_BIT(CR_RXEN),
.ssc_disable = SSC_BIT(CR_RXDIS),
+ .ssc_error = SSC_BIT(SR_OVRUN),
.ssc_endx = SSC_BIT(SR_ENDRX),
.ssc_endbuf = SSC_BIT(SR_RXBUFF),
.pdc_enable = ATMEL_PDC_RXTEN,
@@ -175,7 +176,8 @@ static irqreturn_t atmel_ssc_interrupt(int irq, void *dev_id)
if ((dma_params != NULL) &&
(dma_params->dma_intr_handler != NULL)) {
ssc_substream_mask = (dma_params->mask->ssc_endx |
- dma_params->mask->ssc_endbuf);
+ dma_params->mask->ssc_endbuf |
+ dma_params->mask->ssc_error);
if (ssc_sr & ssc_substream_mask) {
dma_params->dma_intr_handler(ssc_sr,
dma_params->
@@ -368,19 +370,19 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S8:
bits = 8;
- dma_params->pdc_xfer_size = 1;
+ dma_params->data_xfer_size = 1;
break;
case SNDRV_PCM_FORMAT_S16_LE:
bits = 16;
- dma_params->pdc_xfer_size = 2;
+ dma_params->data_xfer_size = 2;
break;
case SNDRV_PCM_FORMAT_S24_LE:
bits = 24;
- dma_params->pdc_xfer_size = 4;
+ dma_params->data_xfer_size = 4;
break;
case SNDRV_PCM_FORMAT_S32_LE:
bits = 32;
- dma_params->pdc_xfer_size = 4;
+ dma_params->data_xfer_size = 4;
break;
default:
printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format");
@@ -553,15 +555,17 @@ static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
/* Reset the SSC and its PDC registers */
ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
- ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
- ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
- ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
- ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);
+ if (!ssc_p->ssc->pdata->use_dma) {
+ ssc_writel(ssc_p->ssc->regs, PDC_RPR, 0);
+ ssc_writel(ssc_p->ssc->regs, PDC_RCR, 0);
+ ssc_writel(ssc_p->ssc->regs, PDC_RNPR, 0);
+ ssc_writel(ssc_p->ssc->regs, PDC_RNCR, 0);
- ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
- ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
- ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
- ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
+ ssc_writel(ssc_p->ssc->regs, PDC_TPR, 0);
+ ssc_writel(ssc_p->ssc->regs, PDC_TCR, 0);
+ ssc_writel(ssc_p->ssc->regs, PDC_TNPR, 0);
+ ssc_writel(ssc_p->ssc->regs, PDC_TNCR, 0);
+ }
ret = request_irq(ssc_p->ssc->irq, atmel_ssc_interrupt, 0,
ssc_p->name, ssc_p);
--
1.7.9.5
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