[alsa-devel] [PATCH 5/7] ASoC i.MX: switch to new DMA api
Sascha Hauer
s.hauer at pengutronix.de
Thu Nov 4 17:05:43 CET 2010
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
sound/soc/imx/imx-pcm-dma-mx2.c | 221 +++++++++++++++++----------------------
sound/soc/imx/imx-ssi.h | 3 +
2 files changed, 101 insertions(+), 123 deletions(-)
diff --git a/sound/soc/imx/imx-pcm-dma-mx2.c b/sound/soc/imx/imx-pcm-dma-mx2.c
index fd493ee..671ef8d 100644
--- a/sound/soc/imx/imx-pcm-dma-mx2.c
+++ b/sound/soc/imx/imx-pcm-dma-mx2.c
@@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/dmaengine.h>
#include <sound/core.h>
#include <sound/initval.h>
@@ -27,165 +28,146 @@
#include <sound/pcm_params.h>
#include <sound/soc.h>
-#include <mach/dma-mx1-mx2.h>
+#include <mach/dma.h>
#include "imx-ssi.h"
struct imx_pcm_runtime_data {
- int sg_count;
- struct scatterlist *sg_list;
- int period;
+ int period_bytes;
int periods;
- unsigned long dma_addr;
int dma;
- struct snd_pcm_substream *substream;
unsigned long offset;
unsigned long size;
- unsigned long period_cnt;
void *buf;
int period_time;
+ struct dma_async_tx_descriptor *desc;
+ struct dma_chan *dma_chan;
+ struct imx_dma_data dma_data;
};
-/* Called by the DMA framework when a period has elapsed */
-static void imx_ssi_dma_progression(int channel, void *data,
- struct scatterlist *sg)
+static void audio_dma_irq(void *data)
{
- struct snd_pcm_substream *substream = data;
+ struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
- if (!sg)
- return;
-
- runtime = iprtd->substream->runtime;
+ iprtd->offset += iprtd->period_bytes;
+ iprtd->offset %= iprtd->period_bytes * iprtd->periods;
- iprtd->offset = sg->dma_address - runtime->dma_addr;
-
- snd_pcm_period_elapsed(iprtd->substream);
+ snd_pcm_period_elapsed(substream);
}
-static void imx_ssi_dma_callback(int channel, void *data)
+static bool filter(struct dma_chan *chan, void *param)
{
- pr_err("%s shouldn't be called\n", __func__);
-}
+ struct imx_pcm_runtime_data *iprtd = param;
-static void snd_imx_dma_err_callback(int channel, void *data, int err)
-{
- struct snd_pcm_substream *substream = data;
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct imx_pcm_dma_params *dma_params =
- snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct imx_pcm_runtime_data *iprtd = runtime->private_data;
- int ret;
+ if (!imx_dma_is_general_purpose(chan))
+ return false;
- pr_err("DMA timeout on channel %d -%s%s%s%s\n",
- channel,
- err & IMX_DMA_ERR_BURST ? " burst" : "",
- err & IMX_DMA_ERR_REQUEST ? " request" : "",
- err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
- err & IMX_DMA_ERR_BUFFER ? " buffer" : "");
+ chan->private = &iprtd->dma_data;
- imx_dma_disable(iprtd->dma);
- ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
- IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
- substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
- DMA_MODE_WRITE : DMA_MODE_READ);
- if (!ret)
- imx_dma_enable(iprtd->dma);
+ return true;
}
-static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream)
+static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct imx_pcm_dma_params *dma_params;
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+ struct dma_slave_config slave_config;
+ dma_cap_mask_t mask;
+ enum dma_slave_buswidth buswidth;
int ret;
dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
- iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
- if (iprtd->dma < 0) {
- pr_err("Failed to claim the audio DMA\n");
- return -ENODEV;
- }
+ iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
+ iprtd->dma_data.priority = DMA_PRIO_HIGH;
+ iprtd->dma_data.dma_request = dma_params->dma;
- ret = imx_dma_setup_handlers(iprtd->dma,
- imx_ssi_dma_callback,
- snd_imx_dma_err_callback, substream);
- if (ret)
- goto out;
+ /* Try to grab a DMA channel */
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+ iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
+ if (!iprtd->dma_chan)
+ return -EINVAL;
- ret = imx_dma_setup_progression_handler(iprtd->dma,
- imx_ssi_dma_progression);
- if (ret) {
- pr_err("Failed to setup the DMA handler\n");
- goto out;
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S24_LE:
+ buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ break;
+ default:
+ return 0;
}
- ret = imx_dma_config_channel(iprtd->dma,
- IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
- IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
- dma_params->dma, 1);
- if (ret < 0) {
- pr_err("Cannot configure DMA channel: %d\n", ret);
- goto out;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ slave_config.direction = DMA_TO_DEVICE;
+ slave_config.dst_addr = dma_params->dma_addr;
+ slave_config.dst_addr_width = buswidth;
+ slave_config.dst_maxburst = dma_params->burstsize;
+ } else {
+ slave_config.direction = DMA_FROM_DEVICE;
+ slave_config.src_addr = dma_params->dma_addr;
+ slave_config.src_addr_width = buswidth;
+ slave_config.src_maxburst = dma_params->burstsize;
}
- imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
+ ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
+ if (ret)
+ return ret;
return 0;
-out:
- imx_dma_free(iprtd->dma);
- return ret;
}
static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
- int i;
unsigned long dma_addr;
+ struct dma_chan *chan;
+ struct imx_pcm_dma_params *dma_params;
+ int ret;
- imx_ssi_dma_alloc(substream);
+ dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+ ret = imx_ssi_dma_alloc(substream, params);
+ if (ret)
+ return ret;
+ chan = iprtd->dma_chan;
iprtd->size = params_buffer_bytes(params);
iprtd->periods = params_periods(params);
- iprtd->period = params_period_bytes(params);
+ iprtd->period_bytes = params_period_bytes(params);
iprtd->offset = 0;
iprtd->period_time = HZ / (params_rate(params) /
params_period_size(params));
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
- if (iprtd->sg_count != iprtd->periods) {
- kfree(iprtd->sg_list);
-
- iprtd->sg_list = kcalloc(iprtd->periods + 1,
- sizeof(struct scatterlist), GFP_KERNEL);
- if (!iprtd->sg_list)
- return -ENOMEM;
- iprtd->sg_count = iprtd->periods + 1;
- }
-
- sg_init_table(iprtd->sg_list, iprtd->sg_count);
dma_addr = runtime->dma_addr;
- for (i = 0; i < iprtd->periods; i++) {
- iprtd->sg_list[i].page_link = 0;
- iprtd->sg_list[i].offset = 0;
- iprtd->sg_list[i].dma_address = dma_addr;
- iprtd->sg_list[i].length = iprtd->period;
- dma_addr += iprtd->period;
+ iprtd->buf = (unsigned int *)substream->dma_buffer.area;
+
+ iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
+ iprtd->period_bytes * iprtd->periods,
+ iprtd->period_bytes,
+ substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (!iprtd->desc) {
+ dev_err(&chan->dev->device, "cannot prepare slave dma\n");
+ return -EINVAL;
}
- /* close the loop */
- iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
- iprtd->sg_list[iprtd->sg_count - 1].length = 0;
- iprtd->sg_list[iprtd->sg_count - 1].page_link =
- ((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
+ iprtd->desc->callback = audio_dma_irq;
+ iprtd->desc->callback_param = substream;
+
return 0;
}
@@ -194,41 +176,21 @@ static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
- if (iprtd->dma >= 0) {
- imx_dma_free(iprtd->dma);
- iprtd->dma = -EINVAL;
+ if (iprtd->dma_chan) {
+ dma_release_channel(iprtd->dma_chan);
+ iprtd->dma_chan = NULL;
}
- kfree(iprtd->sg_list);
- iprtd->sg_list = NULL;
-
return 0;
}
static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
{
- struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct imx_pcm_dma_params *dma_params;
- struct imx_pcm_runtime_data *iprtd = runtime->private_data;
- int err;
dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
- iprtd->substream = substream;
- iprtd->buf = (unsigned int *)substream->dma_buffer.area;
- iprtd->period_cnt = 0;
-
- pr_debug("%s: buf: %p period: %d periods: %d\n",
- __func__, iprtd->buf, iprtd->period, iprtd->periods);
-
- err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
- IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
- substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
- DMA_MODE_WRITE : DMA_MODE_READ);
- if (err)
- return err;
-
return 0;
}
@@ -241,14 +203,14 @@ static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- imx_dma_enable(iprtd->dma);
+ dmaengine_submit(iprtd->desc);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- imx_dma_disable(iprtd->dma);
+ dmaengine_terminate_all(iprtd->dma_chan);
break;
default:
@@ -263,6 +225,9 @@ static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+ pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
+ bytes_to_frames(substream->runtime, iprtd->offset));
+
return bytes_to_frames(substream->runtime, iprtd->offset);
}
@@ -279,7 +244,7 @@ static struct snd_pcm_hardware snd_imx_hardware = {
.channels_max = 2,
.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
.period_bytes_min = 128,
- .period_bytes_max = 16 * 1024,
+ .period_bytes_max = 65535, /* Limited by SDMA engine */
.periods_min = 2,
.periods_max = 255,
.fifo_size = 0,
@@ -304,11 +269,23 @@ static int snd_imx_open(struct snd_pcm_substream *substream)
}
snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
+
+ return 0;
+}
+
+static int snd_imx_close(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct imx_pcm_runtime_data *iprtd = runtime->private_data;
+
+ kfree(iprtd);
+
return 0;
}
static struct snd_pcm_ops imx_pcm_ops = {
.open = snd_imx_open,
+ .close = snd_imx_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_imx_pcm_hw_params,
.hw_free = snd_imx_pcm_hw_free,
@@ -340,7 +317,6 @@ static struct platform_driver imx_pcm_driver = {
.name = "imx-pcm-audio",
.owner = THIS_MODULE,
},
-
.probe = imx_soc_platform_probe,
.remove = __devexit_p(imx_soc_platform_remove),
};
@@ -356,4 +332,3 @@ static void __exit snd_imx_pcm_exit(void)
platform_driver_unregister(&imx_pcm_driver);
}
module_exit(snd_imx_pcm_exit);
-
diff --git a/sound/soc/imx/imx-ssi.h b/sound/soc/imx/imx-ssi.h
index 4fc17da..a4406a1 100644
--- a/sound/soc/imx/imx-ssi.h
+++ b/sound/soc/imx/imx-ssi.h
@@ -185,6 +185,9 @@
#define DRV_NAME "imx-ssi"
+#include <linux/dmaengine.h>
+#include <mach/dma.h>
+
struct imx_pcm_dma_params {
int dma;
unsigned long dma_addr;
--
1.7.2.3
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