[PATCH V2 12/12] ASoC: Samsung: Update DMA interface
Kukjin Kim
kgene.kim at samsung.com
Wed Jul 13 04:47:37 EDT 2011
From: Boojin Kim <boojin.kim at samsung.com>
This patch adds to support the DMA PL330 driver that uses
DMA generic API. Samsung sound driver uses DMA generic API
if architecture supports it. Otherwise, use samsung specific
S3C-PL330 API driver to transfer PCM data.
Signed-off-by: Boojin Kim <boojin.kim at samsung.com>
Cc: Jassi Brar <jassisinghbrar at gmail.com>
Cc: Liam Girdwood <lrg at ti.com>
Cc: Mark Brown <broonie at opensource.wolfsonmicro.com>
Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
---
arch/arm/mach-s3c2410/include/mach/dma.h | 2 +-
arch/arm/mach-s3c64xx/include/mach/dma.h | 2 +-
arch/arm/plat-samsung/include/plat/dma-pl330.h | 2 +-
sound/soc/samsung/ac97.c | 8 +-
sound/soc/samsung/dma.c | 158 ++++++++++--------------
sound/soc/samsung/dma.h | 4 +-
6 files changed, 79 insertions(+), 97 deletions(-)
diff --git a/arch/arm/mach-s3c2410/include/mach/dma.h b/arch/arm/mach-s3c2410/include/mach/dma.h
index 71a662d..c69d60a 100644
--- a/arch/arm/mach-s3c2410/include/mach/dma.h
+++ b/arch/arm/mach-s3c2410/include/mach/dma.h
@@ -197,7 +197,7 @@ struct s3c2410_dma_chan {
typedef unsigned long dma_device_t;
-static inline bool s3c_dma_has_circular(void)
+static inline bool dma_has_circular(void)
{
return false;
}
diff --git a/arch/arm/mach-s3c64xx/include/mach/dma.h b/arch/arm/mach-s3c64xx/include/mach/dma.h
index 0a5d926..d752e27 100644
--- a/arch/arm/mach-s3c64xx/include/mach/dma.h
+++ b/arch/arm/mach-s3c64xx/include/mach/dma.h
@@ -58,7 +58,7 @@ enum dma_ch {
DMACH_MAX /* the end */
};
-static __inline__ bool s3c_dma_has_circular(void)
+static inline bool dma_has_circular(void)
{
return true;
}
diff --git a/arch/arm/plat-samsung/include/plat/dma-pl330.h b/arch/arm/plat-samsung/include/plat/dma-pl330.h
index dbc1288..4bd0e49 100644
--- a/arch/arm/plat-samsung/include/plat/dma-pl330.h
+++ b/arch/arm/plat-samsung/include/plat/dma-pl330.h
@@ -100,7 +100,7 @@ struct s3c2410_dma_client {
char *name;
};
-static inline bool s3c_dma_has_circular(void)
+static inline bool dma_has_circular(void)
{
return true;
}
diff --git a/sound/soc/samsung/ac97.c b/sound/soc/samsung/ac97.c
index f97110e..e09cb9d 100644
--- a/sound/soc/samsung/ac97.c
+++ b/sound/soc/samsung/ac97.c
@@ -271,7 +271,9 @@ static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
- s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
+ if (!dma_data->ops)
+ dma_data->ops = samsung_dma_get_ops();
+ dma_data->ops->started(dma_data->channel);
return 0;
}
@@ -317,7 +319,9 @@ static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
- s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
+ if (!dma_data->ops)
+ dma_data->ops = samsung_dma_get_ops();
+ dma_data->ops->started(dma_data->channel);
return 0;
}
diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c
index 5cb3b88..b5f5f6b 100644
--- a/sound/soc/samsung/dma.c
+++ b/sound/soc/samsung/dma.c
@@ -17,6 +17,9 @@
#include <linux/slab.h>
#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/amba/pl330.h>
+
#include <sound/soc.h>
#include <sound/pcm_params.h>
@@ -62,77 +65,80 @@ struct runtime_data {
struct s3c_dma_params *params;
};
+static void audio_buffdone(void *data);
+
/* dma_enqueue
*
* place a dma buffer onto the queue for the dma system
* to handle.
-*/
+ */
static void dma_enqueue(struct snd_pcm_substream *substream)
{
struct runtime_data *prtd = substream->runtime->private_data;
dma_addr_t pos = prtd->dma_pos;
unsigned int limit;
- int ret;
+ struct samsung_dma_prep_info dma_info;
pr_debug("Entered %s\n", __func__);
- if (s3c_dma_has_circular())
- limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
+ limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
+
+ if (dma_has_circular())
+ dma_info.cap = DMA_CYCLIC;
else
- limit = prtd->dma_limit;
+ dma_info.cap = DMA_SLAVE;
- pr_debug("%s: loaded %d, limit %d\n",
- __func__, prtd->dma_loaded, limit);
+ dma_info.direction =
+ (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
+ ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ dma_info.fp = audio_buffdone;
+ dma_info.fp_param = substream;
+ dma_info.period = prtd->dma_period;
+ dma_info.len = prtd->dma_period*limit;
while (prtd->dma_loaded < limit) {
- unsigned long len = prtd->dma_period;
-
pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
- if ((pos + len) > prtd->dma_end) {
- len = prtd->dma_end - pos;
- pr_debug("%s: corrected dma len %ld\n", __func__, len);
+ if ((pos + dma_info.period) > prtd->dma_end) {
+ dma_info.period = prtd->dma_end - pos;
+ pr_debug("%s: corrected dma len %ld\n",
+ __func__, dma_info.period);
}
- ret = s3c2410_dma_enqueue(prtd->params->channel,
- substream, pos, len);
+ dma_info.buf = pos;
+ prtd->params->ops->prepare(prtd->params->ch, &dma_info);
- if (ret == 0) {
- prtd->dma_loaded++;
- pos += prtd->dma_period;
- if (pos >= prtd->dma_end)
- pos = prtd->dma_start;
- } else
- break;
+ prtd->dma_loaded++;
+ pos += prtd->dma_period;
+ if (pos >= prtd->dma_end)
+ pos = prtd->dma_start;
}
prtd->dma_pos = pos;
}
-static void audio_buffdone(struct s3c2410_dma_chan *channel,
- void *dev_id, int size,
- enum s3c2410_dma_buffresult result)
+static void audio_buffdone(void *data)
{
- struct snd_pcm_substream *substream = dev_id;
- struct runtime_data *prtd;
+ struct snd_pcm_substream *substream = data;
+ struct runtime_data *prtd = substream->runtime->private_data;
pr_debug("Entered %s\n", __func__);
- if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
- return;
+ if (prtd->state & ST_RUNNING) {
+ prtd->dma_pos += prtd->dma_period;
+ if (prtd->dma_pos >= prtd->dma_end)
+ prtd->dma_pos = prtd->dma_start;
- prtd = substream->runtime->private_data;
+ if (substream)
+ snd_pcm_period_elapsed(substream);
- if (substream)
- snd_pcm_period_elapsed(substream);
-
- spin_lock(&prtd->lock);
- if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) {
- prtd->dma_loaded--;
- dma_enqueue(substream);
+ spin_lock(&prtd->lock);
+ if (!dma_has_circular()) {
+ prtd->dma_loaded--;
+ dma_enqueue(substream);
+ }
+ spin_unlock(&prtd->lock);
}
-
- spin_unlock(&prtd->lock);
}
static int dma_hw_params(struct snd_pcm_substream *substream,
@@ -144,8 +150,7 @@ static int dma_hw_params(struct snd_pcm_substream *substream,
unsigned long totbytes = params_buffer_bytes(params);
struct s3c_dma_params *dma =
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
- int ret = 0;
-
+ struct samsung_dma_info dma_info;
pr_debug("Entered %s\n", __func__);
@@ -154,32 +159,26 @@ static int dma_hw_params(struct snd_pcm_substream *substream,
if (!dma)
return 0;
- /* this may get called several times by oss emulation
- * with different params -HW */
if (prtd->params == NULL) {
- /* prepare DMA */
prtd->params = dma;
- pr_debug("params %p, client %p, channel %d\n", prtd->params,
- prtd->params->client, prtd->params->channel);
-
- ret = s3c2410_dma_request(prtd->params->channel,
- prtd->params->client, NULL);
-
- if (ret < 0) {
- printk(KERN_ERR "failed to get dma channel\n");
- return ret;
- }
-
- /* use the circular buffering if we have it available. */
- if (s3c_dma_has_circular())
- s3c2410_dma_setflags(prtd->params->channel,
- S3C2410_DMAF_CIRCULAR);
+ prtd->params->ops = samsung_dma_get_ops();
+
+ /* request channel */
+ if (dma_has_circular())
+ dma_info.cap = DMA_CYCLIC;
+ else
+ dma_info.cap = DMA_SLAVE;
+ dma_info.client = prtd->params->client;
+ dma_info.direction =
+ (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
+ ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ dma_info.width = prtd->params->dma_size;
+ dma_info.fifo = prtd->params->dma_addr;
+ prtd->params->ch = prtd->params->ops->request(
+ prtd->params->channel, &dma_info);
}
- s3c2410_dma_set_buffdone_fn(prtd->params->channel,
- audio_buffdone);
-
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
runtime->dma_bytes = totbytes;
@@ -206,7 +205,8 @@ static int dma_hw_free(struct snd_pcm_substream *substream)
snd_pcm_set_runtime_buffer(substream, NULL);
if (prtd->params) {
- s3c2410_dma_free(prtd->params->channel, prtd->params->client);
+ prtd->params->ops->release(prtd->params->ch,
+ prtd->params->client);
prtd->params = NULL;
}
@@ -225,23 +225,8 @@ static int dma_prepare(struct snd_pcm_substream *substream)
if (!prtd->params)
return 0;
- /* channel needs configuring for mem=>device, increment memory addr,
- * sync to pclk, half-word transfers to the IIS-FIFO. */
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- s3c2410_dma_devconfig(prtd->params->channel,
- S3C2410_DMASRC_MEM,
- prtd->params->dma_addr);
- } else {
- s3c2410_dma_devconfig(prtd->params->channel,
- S3C2410_DMASRC_HW,
- prtd->params->dma_addr);
- }
+ prtd->params->ops->flush(prtd->params->ch);
- s3c2410_dma_config(prtd->params->channel,
- prtd->params->dma_size);
-
- /* flush the DMA channel */
- s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
prtd->dma_loaded = 0;
prtd->dma_pos = prtd->dma_start;
@@ -265,14 +250,14 @@ static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
prtd->state |= ST_RUNNING;
- s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
+ prtd->params->ops->trigger(prtd->params->ch);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
prtd->state &= ~ST_RUNNING;
- s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
+ prtd->params->ops->stop(prtd->params->ch);
break;
default:
@@ -291,21 +276,12 @@ dma_pointer(struct snd_pcm_substream *substream)
struct snd_pcm_runtime *runtime = substream->runtime;
struct runtime_data *prtd = runtime->private_data;
unsigned long res;
- dma_addr_t src, dst;
pr_debug("Entered %s\n", __func__);
- spin_lock(&prtd->lock);
- s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
-
- if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
- res = dst - prtd->dma_start;
- else
- res = src - prtd->dma_start;
-
- spin_unlock(&prtd->lock);
+ res = prtd->dma_pos - prtd->dma_start;
- pr_debug("Pointer %x %x\n", src, dst);
+ pr_debug("Pointer offset: %lu\n", res);
/* we seem to be getting the odd error from the pcm library due
* to out-of-bounds pointers. this is maybe due to the dma engine
diff --git a/sound/soc/samsung/dma.h b/sound/soc/samsung/dma.h
index c506592..7d1ead7 100644
--- a/sound/soc/samsung/dma.h
+++ b/sound/soc/samsung/dma.h
@@ -6,7 +6,7 @@
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
- * ALSA PCM interface for the Samsung S3C24xx CPU
+ * ALSA PCM interface for the Samsung SoC
*/
#ifndef _S3C_AUDIO_H
@@ -17,6 +17,8 @@ struct s3c_dma_params {
int channel; /* Channel ID */
dma_addr_t dma_addr;
int dma_size; /* Size of the DMA transfer */
+ unsigned ch;
+ struct samsung_dma_ops *ops;
};
#endif
--
1.7.1
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