Original author: Russell King rmk+kernel@arm.linux.org.uk
Switch the omap-pcm to use dmaengine. Certain features are not supported by after dmaengine conversion: 1. No period wakeup mode DMA engine has no way to communicate this information through standard channels.
Signed-off-by: Peter Ujfalusi peter.ujfalusi@ti.com CC: Russell King rmk+kernel@arm.linux.org.uk --- sound/soc/omap/Kconfig | 3 +- sound/soc/omap/omap-pcm.c | 269 ++++++++++------------------------------------ 2 files changed, 61 insertions(+), 211 deletions(-)
diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig index 2c484a5..7048137 100644 --- a/sound/soc/omap/Kconfig +++ b/sound/soc/omap/Kconfig @@ -1,6 +1,7 @@ config SND_OMAP_SOC tristate "SoC Audio for the Texas Instruments OMAP chips" - depends on ARCH_OMAP + depends on ARCH_OMAP && DMA_OMAP + select SND_SOC_DMAENGINE_PCM
config SND_OMAP_SOC_DMIC tristate diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c index 74da4b7..a2636f6 100644 --- a/sound/soc/omap/omap-pcm.c +++ b/sound/soc/omap/omap-pcm.c @@ -25,12 +25,13 @@ #include <linux/dma-mapping.h> #include <linux/slab.h> #include <linux/module.h> +#include <linux/omap-dma.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> +#include <sound/dmaengine_pcm.h> #include <sound/soc.h>
-#include <plat/dma.h> #include "omap-pcm.h"
static const struct snd_pcm_hardware omap_pcm_hardware = { @@ -49,61 +50,34 @@ static const struct snd_pcm_hardware omap_pcm_hardware = { .buffer_bytes_max = 128 * 1024, };
-struct omap_runtime_data { - spinlock_t lock; - struct omap_pcm_dma_data *dma_data; - int dma_ch; - int period_index; -}; - -static void omap_pcm_dma_irq(int ch, u16 stat, void *data) +static int omap_pcm_get_dma_buswidth(int num_bits) { - struct snd_pcm_substream *substream = data; - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - unsigned long flags; - - if ((cpu_is_omap1510())) { - /* - * OMAP1510 doesn't fully support DMA progress counter - * and there is no software emulation implemented yet, - * so have to maintain our own progress counters - * that can be used by omap_pcm_pointer() instead. - */ - spin_lock_irqsave(&prtd->lock, flags); - if ((stat == OMAP_DMA_LAST_IRQ) && - (prtd->period_index == runtime->periods - 1)) { - /* we are in sync, do nothing */ - spin_unlock_irqrestore(&prtd->lock, flags); - return; - } - if (prtd->period_index >= 0) { - if (stat & OMAP_DMA_BLOCK_IRQ) { - /* end of buffer reached, loop back */ - prtd->period_index = 0; - } else if (stat & OMAP_DMA_LAST_IRQ) { - /* update the counter for the last period */ - prtd->period_index = runtime->periods - 1; - } else if (++prtd->period_index >= runtime->periods) { - /* end of buffer missed? loop back */ - prtd->period_index = 0; - } - } - spin_unlock_irqrestore(&prtd->lock, flags); - } + int buswidth;
- snd_pcm_period_elapsed(substream); + switch (num_bits) { + case 16: + buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case 32: + buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + default: + buswidth = -EINVAL; + break; + } + return buswidth; }
+ /* this may get called several times by oss emulation */ static int omap_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct omap_runtime_data *prtd = runtime->private_data; struct omap_pcm_dma_data *dma_data; - + struct dma_slave_config config; + struct dma_chan *chan; int err = 0;
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); @@ -116,195 +90,78 @@ static int omap_pcm_hw_params(struct snd_pcm_substream *substream, snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); runtime->dma_bytes = params_buffer_bytes(params);
- if (prtd->dma_data) - return 0; - prtd->dma_data = dma_data; - err = omap_request_dma(dma_data->dma_req, dma_data->name, - omap_pcm_dma_irq, substream, &prtd->dma_ch); - if (!err) { - /* - * Link channel with itself so DMA doesn't need any - * reprogramming while looping the buffer - */ - omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch); - } - - return err; -} - -static int omap_pcm_hw_free(struct snd_pcm_substream *substream) -{ - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - - if (prtd->dma_data == NULL) - return 0; + chan = snd_dmaengine_pcm_get_chan(substream); + if (!chan) + return -EINVAL;
- omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch); - omap_free_dma(prtd->dma_ch); - prtd->dma_data = NULL; + /* fills in addr_width and direction */ + err = snd_hwparams_to_dma_slave_config(substream, params, &config); + if (err) + return err;
- snd_pcm_set_runtime_buffer(substream, NULL); + /* Override the *_dma addr_width if requested by the DAI driver */ + if (dma_data->data_type) { + int buswidth = omap_pcm_get_dma_buswidth(dma_data->data_type);
- return 0; -} + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + config.dst_addr_width = buswidth; + else + config.src_addr_width = buswidth; + }
-static int omap_pcm_get_dma_type(int num_bits) -{ - int data_type; + config.src_addr = dma_data->port_addr; + config.dst_addr = dma_data->port_addr; + config.src_maxburst = dma_data->packet_size; + config.dst_maxburst = dma_data->packet_size;
- switch (num_bits) { - case 16: - data_type = OMAP_DMA_DATA_TYPE_S16; - break; - case 32: - data_type = OMAP_DMA_DATA_TYPE_S32; - break; - default: - data_type = -EINVAL; - break; - } - return data_type; + return dmaengine_slave_config(chan, &config); }
-static int omap_pcm_prepare(struct snd_pcm_substream *substream) +static int omap_pcm_hw_free(struct snd_pcm_substream *substream) { - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - struct omap_pcm_dma_data *dma_data = prtd->dma_data; - struct omap_dma_channel_params dma_params; - int bytes; - - /* return if this is a bufferless transfer e.g. - * codec <--> BT codec or GSM modem -- lg FIXME */ - if (!prtd->dma_data) - return 0; - - memset(&dma_params, 0, sizeof(dma_params)); - - if (dma_data->data_type) - dma_params.data_type = omap_pcm_get_dma_type( - dma_data->data_type); - else - dma_params.data_type = omap_pcm_get_dma_type( - snd_pcm_format_physical_width(runtime->format)); - - if (dma_params.data_type < 0) - return dma_params.data_type; - - dma_params.trigger = dma_data->dma_req; - - if (dma_data->packet_size) - dma_params.sync_mode = OMAP_DMA_SYNC_PACKET; - else - dma_params.sync_mode = OMAP_DMA_SYNC_ELEMENT; - - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { - dma_params.src_amode = OMAP_DMA_AMODE_POST_INC; - dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT; - dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC; - dma_params.src_start = runtime->dma_addr; - dma_params.dst_start = dma_data->port_addr; - dma_params.dst_port = OMAP_DMA_PORT_MPUI; - dma_params.dst_fi = dma_data->packet_size; - } else { - dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT; - dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC; - dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC; - dma_params.src_start = dma_data->port_addr; - dma_params.dst_start = runtime->dma_addr; - dma_params.src_port = OMAP_DMA_PORT_MPUI; - dma_params.src_fi = dma_data->packet_size; - } - /* - * Set DMA transfer frame size equal to ALSA period size and frame - * count as no. of ALSA periods. Then with DMA frame interrupt enabled, - * we can transfer the whole ALSA buffer with single DMA transfer but - * still can get an interrupt at each period bounary - */ - bytes = snd_pcm_lib_period_bytes(substream); - dma_params.elem_count = bytes >> dma_params.data_type; - dma_params.frame_count = runtime->periods; - omap_set_dma_params(prtd->dma_ch, &dma_params); - - if ((cpu_is_omap1510())) - omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ | - OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ); - else if (!substream->runtime->no_period_wakeup) - omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ); - else { - /* - * No period wakeup: - * we need to disable BLOCK_IRQ, which is enabled by the omap - * dma core at request dma time. - */ - omap_disable_dma_irq(prtd->dma_ch, OMAP_DMA_BLOCK_IRQ); - } - - if (!(cpu_class_is_omap1())) { - omap_set_dma_src_burst_mode(prtd->dma_ch, - OMAP_DMA_DATA_BURST_16); - omap_set_dma_dest_burst_mode(prtd->dma_ch, - OMAP_DMA_DATA_BURST_16); - } - + snd_pcm_set_runtime_buffer(substream, NULL); return 0; }
static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - struct omap_pcm_dma_data *dma_data = prtd->dma_data; - unsigned long flags; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct omap_pcm_dma_data *dma_data; int ret = 0;
- spin_lock_irqsave(&prtd->lock, flags); + dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - prtd->period_index = 0; /* Configure McBSP internal buffer usage */ if (dma_data->set_threshold) dma_data->set_threshold(substream); - - omap_start_dma(prtd->dma_ch); break;
case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - prtd->period_index = -1; - omap_stop_dma(prtd->dma_ch); break; default: ret = -EINVAL; } - spin_unlock_irqrestore(&prtd->lock, flags); + + if (ret == 0) + ret = snd_dmaengine_pcm_trigger(substream, cmd);
return ret; }
static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) { - struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd = runtime->private_data; - dma_addr_t ptr; snd_pcm_uframes_t offset;
- if (cpu_is_omap1510()) { - offset = prtd->period_index * runtime->period_size; - } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { - ptr = omap_get_dma_dst_pos(prtd->dma_ch); - offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); - } else { - ptr = omap_get_dma_src_pos(prtd->dma_ch); - offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); - } - - if (offset >= runtime->buffer_size) - offset = 0; + if (cpu_is_omap1510()) + offset = snd_dmaengine_pcm_pointer_no_residue(substream); + else + offset = snd_dmaengine_pcm_pointer(substream);
return offset; } @@ -312,7 +169,8 @@ static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) static int omap_pcm_open(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; - struct omap_runtime_data *prtd; + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct omap_pcm_dma_data *dma_data; int ret;
snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); @@ -321,25 +179,17 @@ static int omap_pcm_open(struct snd_pcm_substream *substream) ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); if (ret < 0) - goto out; - - prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); - if (prtd == NULL) { - ret = -ENOMEM; - goto out; - } - spin_lock_init(&prtd->lock); - runtime->private_data = prtd; + return ret;
-out: + dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + ret = snd_dmaengine_pcm_open(substream, omap_dma_filter_fn, + &dma_data->dma_req); return ret; }
static int omap_pcm_close(struct snd_pcm_substream *substream) { - struct snd_pcm_runtime *runtime = substream->runtime; - - kfree(runtime->private_data); + snd_dmaengine_pcm_close(substream); return 0; }
@@ -360,7 +210,6 @@ static struct snd_pcm_ops omap_pcm_ops = { .ioctl = snd_pcm_lib_ioctl, .hw_params = omap_pcm_hw_params, .hw_free = omap_pcm_hw_free, - .prepare = omap_pcm_prepare, .trigger = omap_pcm_trigger, .pointer = omap_pcm_pointer, .mmap = omap_pcm_mmap,