[alsa-devel] [PATCH 4/4] ASoC: DaVinci: pcm, fix underrun by using sram
Troy Kisky
troy.kisky at boundarydevices.com
Tue Nov 17 00:52:34 CET 2009
Fix underruns by using dma to copy 1st to sram
in a ping/pong buffer style and then copying from
the sram to the ASP. This also has the advantage
of tolerating very long interrupt latency on dma
completion.
Signed-off-by: Troy Kisky <troy.kisky at boundarydevices.com>
---
arch/arm/mach-davinci/include/mach/asp.h | 2 +
sound/soc/davinci/davinci-i2s.c | 7 +-
sound/soc/davinci/davinci-pcm.c | 512 +++++++++++++++++++++++++++---
sound/soc/davinci/davinci-pcm.h | 1 +
4 files changed, 476 insertions(+), 46 deletions(-)
diff --git a/arch/arm/mach-davinci/include/mach/asp.h b/arch/arm/mach-davinci/include/mach/asp.h
index 019c647..e07f70e 100644
--- a/arch/arm/mach-davinci/include/mach/asp.h
+++ b/arch/arm/mach-davinci/include/mach/asp.h
@@ -57,6 +57,8 @@ struct snd_platform_data {
* when compared to previous behavior.
*/
unsigned enable_channel_combine:1;
+ unsigned sram_size_playback;
+ unsigned sram_size_capture;
/* McASP specific fields */
int tdm_slots;
diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index 771cabe..1d3a678 100644
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -543,8 +543,13 @@ static int davinci_i2s_probe(struct platform_device *pdev)
ret = -ENOMEM;
goto err_release_region;
}
- if (pdata)
+ if (pdata) {
dev->enable_channel_combine = pdata->enable_channel_combine;
+ dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].sram_size =
+ pdata->sram_size_playback;
+ dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].sram_size =
+ pdata->sram_size_capture;
+ }
dev->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk)) {
ret = -ENODEV;
diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
index 7757010..ae9fe75 100644
--- a/sound/soc/davinci/davinci-pcm.c
+++ b/sound/soc/davinci/davinci-pcm.c
@@ -3,6 +3,7 @@
*
* Author: Vladimir Barinov, <vbarinov at embeddedalley.com>
* Copyright: (C) 2007 MontaVista Software, Inc., <source at mvista.com>
+ * added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky at boundarydevices.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -23,10 +24,51 @@
#include <asm/dma.h>
#include <mach/edma.h>
+#include <mach/sram.h>
#include "davinci-pcm.h"
-static struct snd_pcm_hardware davinci_pcm_hardware = {
+#ifdef DEBUG
+static void print_buf_info(int slot, char *name)
+{
+ struct edmacc_param p;
+ if (slot < 0)
+ return;
+ edma_read_slot(slot, &p);
+ printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n",
+ name, slot, p.opt, p.src, p.a_b_cnt, p.dst);
+ printk(KERN_DEBUG " src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n",
+ p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt);
+}
+#else
+static void print_buf_info(int slot, char *name)
+{
+}
+#endif
+
+static struct snd_pcm_hardware pcm_hardware_playback = {
+ .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_PAUSE),
+ .formats = (SNDRV_PCM_FMTBIT_S16_LE),
+ .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
+ SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
+ SNDRV_PCM_RATE_KNOT),
+ .rate_min = 8000,
+ .rate_max = 96000,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = 128 * 1024,
+ .period_bytes_min = 32,
+ .period_bytes_max = 8 * 1024,
+ .periods_min = 16,
+ .periods_max = 255,
+ .fifo_size = 0,
+};
+
+static struct snd_pcm_hardware pcm_hardware_capture = {
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE),
@@ -48,14 +90,58 @@ static struct snd_pcm_hardware davinci_pcm_hardware = {
.fifo_size = 0,
};
+/*
+ * How ping/pong works....
+ *
+ * Playback:
+ * ram_params - copys 2*ping_size from start of SDRAM to iram,
+ * links to ram_link2
+ * ram_link2 - copys rest of SDRAM to iram in ping_size units,
+ * links to ram_link
+ * ram_link - copys entire SDRAM to iram in ping_size uints,
+ * links to self
+ *
+ * asp_params - same as asp_link[0]
+ * asp_link[0] - copys from lower half of iram to asp port
+ * links to asp_link[1], triggers iram copy event on completion
+ * asp_link[1] - copys from upper half of iram to asp port
+ * links to asp_link[0], triggers iram copy event on completion
+ * triggers interrupt only needed to let upper SOC levels update position
+ * in stream on completion
+ *
+ * When playback is started:
+ * ram_params started
+ * asp_params started
+ *
+ * Capture:
+ * ram_params - same as ram_link,
+ * links to ram_link
+ * ram_link - same as playback
+ * links to self
+ *
+ * asp_params - same as playback
+ * asp_link[0] - same as playback
+ * asp_link[1] - same as playback
+ *
+ * When capture is started:
+ * asp_params started
+ */
struct davinci_runtime_data {
spinlock_t lock;
int period; /* current DMA period */
int asp_channel; /* Master DMA channel */
int asp_link[2]; /* asp parameter link channel, ping/pong */
struct davinci_pcm_dma_params *params; /* DMA params */
+ int ram_channel;
+ int ram_link;
+ int ram_link2;
+ struct edmacc_param asp_params;
+ struct edmacc_param ram_params;
};
+/*
+ * Not used with ping/pong
+ */
static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
@@ -109,41 +195,282 @@ static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
struct snd_pcm_substream *substream = data;
struct davinci_runtime_data *prtd = substream->runtime->private_data;
+ print_buf_info(prtd->ram_channel, "i ram_channel");
pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
if (unlikely(ch_status != DMA_COMPLETE))
return;
if (snd_pcm_running(substream)) {
+ if (prtd->ram_channel < 0) {
+ /* No ping/pong must fix up link dma data*/
+ spin_lock(&prtd->lock);
+ davinci_pcm_enqueue_dma(substream);
+ spin_unlock(&prtd->lock);
+ }
snd_pcm_period_elapsed(substream);
+ }
+}
+
+static int allocate_sram(struct snd_pcm_substream *substream, unsigned size,
+ struct snd_pcm_hardware *ppcm)
+{
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+ struct snd_dma_buffer *iram_dma = NULL;
+ dma_addr_t iram_phys = 0;
+ void *iram_virt = NULL;
+
+ if (buf->private_data || !size)
+ return 0;
+
+ ppcm->period_bytes_max = size;
+ iram_virt = sram_alloc(size, &iram_phys);
+ if (!iram_virt)
+ goto exit1;
+ iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
+ if (!iram_dma)
+ goto exit2;
+ iram_dma->area = iram_virt;
+ iram_dma->addr = iram_phys;
+ memset(iram_dma->area, 0, size);
+ iram_dma->bytes = size;
+ buf->private_data = iram_dma;
+ return 0;
+exit2:
+ if (iram_virt)
+ sram_free(iram_virt, size);
+exit1:
+ return -ENOMEM;
+}
- spin_lock(&prtd->lock);
- davinci_pcm_enqueue_dma(substream);
- spin_unlock(&prtd->lock);
+/*
+ * Only used with ping/pong.
+ * This is called after runtime->dma_addr, period_bytes and data_type are valid
+ */
+static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
+{
+ unsigned short ram_src_cidx, ram_dst_cidx;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct davinci_runtime_data *prtd = runtime->private_data;
+ struct snd_dma_buffer *iram_dma =
+ (struct snd_dma_buffer *)substream->dma_buffer.private_data;
+ struct davinci_pcm_dma_params *dma_data = prtd->params;
+ unsigned int data_type = dma_data->data_type;
+ unsigned int acnt = dma_data->acnt;
+ /* divide by 2 for ping/pong */
+ unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
+ int link = prtd->asp_link[1];
+ if ((data_type == 0) || (data_type > 4)) {
+ printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
+ return -EINVAL;
}
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
+ ram_src_cidx = ping_size;
+ ram_dst_cidx = -ping_size;
+ edma_set_src(link, asp_src_pong, INCR, W8BIT);
+
+ link = prtd->asp_link[0];
+ edma_set_src_index(link, data_type, 0);
+ link = prtd->asp_link[1];
+ edma_set_src_index(link, data_type, 0);
+
+ link = prtd->ram_link;
+ edma_set_src(link, runtime->dma_addr, INCR, W32BIT);
+ } else {
+ dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
+ ram_src_cidx = -ping_size;
+ ram_dst_cidx = ping_size;
+ edma_set_dest(link, asp_dst_pong, INCR, W8BIT);
+
+ link = prtd->asp_link[0];
+ edma_set_dest_index(link, data_type, 0);
+ link = prtd->asp_link[1];
+ edma_set_dest_index(link, data_type, 0);
+
+ link = prtd->ram_link;
+ edma_set_dest(link, runtime->dma_addr, INCR, W32BIT);
+ }
+
+ link = prtd->asp_link[0];
+ edma_set_transfer_params(link, acnt,
+ ping_size/data_type, 1, 0, ASYNC);
+ link = prtd->asp_link[1];
+ edma_set_transfer_params(link, acnt,
+ ping_size/data_type, 1, 0, ASYNC);
+
+
+ link = prtd->ram_link;
+ edma_set_src_index(link, ping_size, ram_src_cidx);
+ edma_set_dest_index(link, ping_size, ram_dst_cidx);
+ edma_set_transfer_params(link, ping_size, 2,
+ runtime->periods, 2, ASYNC);
+
+ /* init master params */
+ edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
+ edma_read_slot(prtd->ram_link, &prtd->ram_params);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ struct edmacc_param p_ram;
+ /* Copy entire iram buffer before playback started */
+ prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
+ /* 0 dst_bidx */
+ prtd->ram_params.src_dst_bidx = (ping_size << 1);
+ /* 0 dst_cidx */
+ prtd->ram_params.src_dst_cidx = (ping_size << 1);
+ prtd->ram_params.ccnt = 1;
+
+ /* Skip 1st period */
+ edma_read_slot(prtd->ram_link, &p_ram);
+ p_ram.src += (ping_size << 1);
+ p_ram.ccnt -= 1;
+ edma_write_slot(prtd->ram_link2, &p_ram);
+ /*
+ * When 1st started, ram -> iram dma channel will fill the
+ * entire iram. Then, whenever a ping/pong asp buffer finishes,
+ * 1/2 iram will be filled.
+ */
+ prtd->ram_params.link_bcntrld =
+ EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
+ }
+ return 0;
+}
+
+/* 1 asp tx or rx channel using 2 parameter channels
+ * 1 ram to/from iram channel using 1 parameter channel
+ *
+ * Playback
+ * ram copy channel kicks off first,
+ * 1st ram copy of entire iram buffer completion kicks off asp channel
+ * asp tcc always kicks off ram copy of 1/2 iram buffer
+ *
+ * Record
+ * asp channel starts, tcc kicks off ram copy
+ */
+static int request_ping_pong(struct snd_pcm_substream *substream,
+ struct davinci_runtime_data *prtd,
+ struct snd_dma_buffer *iram_dma)
+{
+ dma_addr_t asp_src_ping;
+ dma_addr_t asp_dst_ping;
+ int link;
+ struct davinci_pcm_dma_params *dma_data = prtd->params;
+
+ /* Request ram master channel */
+ link = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
+ davinci_pcm_dma_irq, substream,
+ EVENTQ_1);
+ if (link < 0)
+ goto exit1;
+
+ /* Request ram link channel */
+ link = prtd->ram_link = edma_alloc_slot(
+ EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
+ if (link < 0)
+ goto exit2;
+
+ link = prtd->asp_link[1] = edma_alloc_slot(
+ EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
+ if (link < 0)
+ goto exit3;
+
+ prtd->ram_link2 = -1;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ link = prtd->ram_link2 = edma_alloc_slot(
+ EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
+ if (link < 0)
+ goto exit4;
+ }
+ /* circle ping-pong buffers */
+ edma_link(prtd->asp_link[0], prtd->asp_link[1]);
+ edma_link(prtd->asp_link[1], prtd->asp_link[0]);
+ /* circle ram buffers */
+ edma_link(prtd->ram_link, prtd->ram_link);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ asp_src_ping = iram_dma->addr;
+ asp_dst_ping = dma_data->dma_addr; /* fifo */
+ } else {
+ asp_src_ping = dma_data->dma_addr; /* fifo */
+ asp_dst_ping = iram_dma->addr;
+ }
+ /* ping */
+ link = prtd->asp_link[0];
+ edma_set_src(link, asp_src_ping, INCR, W16BIT);
+ edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
+ edma_set_src_index(link, 0, 0);
+ edma_set_dest_index(link, 0, 0);
+
+ edma_read_slot(link, &prtd->asp_params);
+ prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
+ prtd->asp_params.opt |= TCCHEN | EDMA_TCC(prtd->ram_channel & 0x3f);
+ edma_write_slot(link, &prtd->asp_params);
+
+ /* pong */
+ link = prtd->asp_link[1];
+ edma_set_src(link, asp_src_ping, INCR, W16BIT);
+ edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
+ edma_set_src_index(link, 0, 0);
+ edma_set_dest_index(link, 0, 0);
+
+ edma_read_slot(link, &prtd->asp_params);
+ prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
+ /* interrupt after every pong completion */
+ prtd->asp_params.opt |= TCINTEN | TCCHEN |
+ EDMA_TCC(EDMA_CHAN_SLOT(prtd->ram_channel));
+ edma_write_slot(link, &prtd->asp_params);
+
+ /* ram */
+ link = prtd->ram_link;
+ edma_set_src(link, iram_dma->addr, INCR, W32BIT);
+ edma_set_dest(link, iram_dma->addr, INCR, W32BIT);
+ pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
+ "for asp:%u %u %u\n", __func__,
+ prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
+ prtd->asp_channel, prtd->asp_link[0],
+ prtd->asp_link[1]);
+ return 0;
+exit4:
+ edma_free_channel(prtd->asp_link[1]);
+ prtd->asp_link[1] = -1;
+exit3:
+ edma_free_channel(prtd->ram_link);
+ prtd->ram_link = -1;
+exit2:
+ edma_free_channel(prtd->ram_channel);
+ prtd->ram_channel = -1;
+exit1:
+ return link;
}
static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
{
+ struct snd_dma_buffer *iram_dma;
struct davinci_runtime_data *prtd = substream->runtime->private_data;
- struct edmacc_param p_ram;
- int ret;
+ struct davinci_pcm_dma_params *dma_data = prtd->params;
+ int link;
- /* Request master DMA channel */
- ret = edma_alloc_channel(prtd->params->channel,
- davinci_pcm_dma_irq, substream,
- EVENTQ_0);
- if (ret < 0)
- return ret;
- prtd->asp_channel = ret;
+ if (!dma_data)
+ return -ENODEV;
- /* Request parameter RAM reload slot */
- ret = edma_alloc_slot(EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
- if (ret < 0) {
- edma_free_channel(prtd->asp_channel);
- return ret;
+ /* Request asp master DMA channel */
+ link = prtd->asp_channel = edma_alloc_channel(dma_data->channel,
+ davinci_pcm_dma_irq, substream, EVENTQ_0);
+ if (link < 0)
+ goto exit1;
+
+ /* Request asp link channels */
+ link = prtd->asp_link[0] = edma_alloc_slot(
+ EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
+ if (link < 0)
+ goto exit2;
+
+ iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
+ if (iram_dma) {
+ if (request_ping_pong(substream, prtd, iram_dma) == 0)
+ return 0;
+ printk(KERN_WARNING "%s: dma channel allocation failed,"
+ "not using sram\n", __func__);
}
- prtd->asp_link[0] = ret;
/* Issue transfer completion IRQ when the channel completes a
* transfer, then always reload from the same slot (by a kind
@@ -154,12 +481,17 @@ static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
* the buffer and its length (ccnt) ... use it as a template
* so davinci_pcm_enqueue_dma() takes less time in IRQ.
*/
- edma_read_slot(prtd->asp_link[0], &p_ram);
- p_ram.opt |= TCINTEN | EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
- p_ram.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
- edma_write_slot(prtd->asp_link[0], &p_ram);
-
+ edma_read_slot(link, &prtd->asp_params);
+ prtd->asp_params.opt |= TCINTEN |
+ EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
+ prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(link) << 5;
+ edma_write_slot(link, &prtd->asp_params);
return 0;
+exit2:
+ edma_free_channel(prtd->asp_channel);
+ prtd->asp_channel = -1;
+exit1:
+ return link;
}
static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
@@ -173,12 +505,12 @@ static int davinci_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:
- edma_start(prtd->asp_channel);
+ edma_resume(prtd->asp_channel);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- edma_stop(prtd->asp_channel);
+ edma_pause(prtd->asp_channel);
break;
default:
ret = -EINVAL;
@@ -193,14 +525,35 @@ static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
- struct edmacc_param temp;
+ if (prtd->ram_channel >= 0) {
+ int ret = ping_pong_dma_setup(substream);
+ if (ret < 0)
+ return ret;
+
+ edma_write_slot(prtd->ram_channel, &prtd->ram_params);
+ edma_write_slot(prtd->asp_channel, &prtd->asp_params);
+
+ print_buf_info(prtd->ram_channel, "ram_channel");
+ print_buf_info(prtd->ram_link, "ram_link");
+ print_buf_info(prtd->ram_link2, "ram_link2");
+ print_buf_info(prtd->asp_channel, "asp_channel");
+ print_buf_info(prtd->asp_link[0], "asp_link[0]");
+ print_buf_info(prtd->asp_link[1], "asp_link[1]");
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ /* copy 1st iram buffer */
+ edma_start(prtd->ram_channel);
+ }
+ edma_start(prtd->asp_channel);
+ return 0;
+ }
prtd->period = 0;
davinci_pcm_enqueue_dma(substream);
/* Copy self-linked parameter RAM entry into master channel */
- edma_read_slot(prtd->asp_link[0], &temp);
- edma_write_slot(prtd->asp_channel, &temp);
+ edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
+ edma_write_slot(prtd->asp_channel, &prtd->asp_params);
davinci_pcm_enqueue_dma(substream);
return 0;
@@ -216,13 +569,46 @@ davinci_pcm_pointer(struct snd_pcm_substream *substream)
dma_addr_t asp_src, asp_dst;
spin_lock(&prtd->lock);
-
- edma_get_position(prtd->asp_channel, &asp_src, &asp_dst);
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- asp_count = asp_src - runtime->dma_addr;
- else
- asp_count = asp_dst - runtime->dma_addr;
-
+ if (prtd->ram_channel >= 0) {
+ int ram_count;
+ int mod_ram;
+ dma_addr_t ram_src, ram_dst;
+ unsigned int period_size = snd_pcm_lib_period_bytes(substream);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ /* reading ram before asp should be safe
+ * as long as the asp transfers less than a ping size
+ * of bytes between the 2 reads
+ */
+ edma_get_position(prtd->ram_channel,
+ &ram_src, &ram_dst);
+ edma_get_position(prtd->asp_channel,
+ &asp_src, &asp_dst);
+ asp_count = asp_src - prtd->asp_params.src;
+ ram_count = ram_src - prtd->ram_params.src;
+ mod_ram = ram_count % period_size;
+ mod_ram -= asp_count;
+ if (mod_ram < 0)
+ mod_ram += period_size;
+ else if (mod_ram == 0) {
+ if (snd_pcm_running(substream))
+ mod_ram += period_size;
+ }
+ ram_count -= mod_ram;
+ if (ram_count < 0)
+ ram_count += period_size * runtime->periods;
+ } else {
+ edma_get_position(prtd->ram_channel,
+ &ram_src, &ram_dst);
+ ram_count = ram_dst - prtd->ram_params.dst;
+ }
+ asp_count = ram_count;
+ } else {
+ edma_get_position(prtd->asp_channel, &asp_src, &asp_dst);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ asp_count = asp_src - runtime->dma_addr;
+ else
+ asp_count = asp_dst - runtime->dma_addr;
+ }
spin_unlock(&prtd->lock);
offset = bytes_to_frames(runtime, asp_count);
@@ -236,6 +622,7 @@ static int davinci_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct davinci_runtime_data *prtd;
+ struct snd_pcm_hardware *ppcm;
int ret = 0;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct davinci_pcm_dma_params *pa = rtd->dai->cpu_dai->dma_data;
@@ -244,7 +631,10 @@ static int davinci_pcm_open(struct snd_pcm_substream *substream)
return -ENODEV;
params = &pa[substream->stream];
- snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
+ ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+ &pcm_hardware_playback : &pcm_hardware_capture;
+ allocate_sram(substream, params->sram_size, ppcm);
+ snd_soc_set_runtime_hwparams(substream, ppcm);
/* ensure that buffer size is a multiple of period size */
ret = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
@@ -257,6 +647,11 @@ static int davinci_pcm_open(struct snd_pcm_substream *substream)
spin_lock_init(&prtd->lock);
prtd->params = params;
+ prtd->asp_channel = -1;
+ prtd->asp_link[0] = prtd->asp_link[1] = -1;
+ prtd->ram_channel = -1;
+ prtd->ram_link = -1;
+ prtd->ram_link2 = -1;
runtime->private_data = prtd;
@@ -274,10 +669,29 @@ static int davinci_pcm_close(struct snd_pcm_substream *substream)
struct snd_pcm_runtime *runtime = substream->runtime;
struct davinci_runtime_data *prtd = runtime->private_data;
- edma_unlink(prtd->asp_link[0]);
-
- edma_free_slot(prtd->asp_link[0]);
- edma_free_channel(prtd->asp_channel);
+ if (prtd->ram_channel >= 0)
+ edma_stop(prtd->ram_channel);
+ if (prtd->asp_channel >= 0)
+ edma_stop(prtd->asp_channel);
+ if (prtd->asp_link[0] >= 0)
+ edma_unlink(prtd->asp_link[0]);
+ if (prtd->asp_link[1] >= 0)
+ edma_unlink(prtd->asp_link[1]);
+ if (prtd->ram_link >= 0)
+ edma_unlink(prtd->ram_link);
+
+ if (prtd->asp_link[0] >= 0)
+ edma_free_slot(prtd->asp_link[0]);
+ if (prtd->asp_link[1] >= 0)
+ edma_free_slot(prtd->asp_link[1]);
+ if (prtd->asp_channel >= 0)
+ edma_free_channel(prtd->asp_channel);
+ if (prtd->ram_link >= 0)
+ edma_free_slot(prtd->ram_link);
+ if (prtd->ram_link2 >= 0)
+ edma_free_slot(prtd->ram_link2);
+ if (prtd->ram_channel >= 0)
+ edma_free_channel(prtd->ram_channel);
kfree(prtd);
@@ -319,11 +733,11 @@ static struct snd_pcm_ops davinci_pcm_ops = {
.mmap = davinci_pcm_mmap,
};
-static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
+ size_t size)
{
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
- size_t size = davinci_pcm_hardware.buffer_bytes_max;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
@@ -348,6 +762,7 @@ static void davinci_pcm_free(struct snd_pcm *pcm)
int stream;
for (stream = 0; stream < 2; stream++) {
+ struct snd_dma_buffer *iram_dma;
substream = pcm->streams[stream].substream;
if (!substream)
continue;
@@ -359,6 +774,11 @@ static void davinci_pcm_free(struct snd_pcm *pcm)
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
+ iram_dma = (struct snd_dma_buffer *)buf->private_data;
+ if (iram_dma) {
+ sram_free(iram_dma->area, iram_dma->bytes);
+ kfree(iram_dma);
+ }
}
}
@@ -376,14 +796,16 @@ static int davinci_pcm_new(struct snd_card *card,
if (dai->playback.channels_min) {
ret = davinci_pcm_preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_PLAYBACK);
+ SNDRV_PCM_STREAM_PLAYBACK,
+ pcm_hardware_playback.buffer_bytes_max);
if (ret)
return ret;
}
if (dai->capture.channels_min) {
ret = davinci_pcm_preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_CAPTURE);
+ SNDRV_PCM_STREAM_CAPTURE,
+ pcm_hardware_capture.buffer_bytes_max);
if (ret)
return ret;
}
diff --git a/sound/soc/davinci/davinci-pcm.h b/sound/soc/davinci/davinci-pcm.h
index 8746606..ca995ca 100644
--- a/sound/soc/davinci/davinci-pcm.h
+++ b/sound/soc/davinci/davinci-pcm.h
@@ -20,6 +20,7 @@ struct davinci_pcm_dma_params {
int channel; /* sync dma channel ID */
unsigned short acnt;
dma_addr_t dma_addr; /* device physical address for DMA */
+ unsigned sram_size;
enum dma_event_q eventq_no; /* event queue number */
unsigned char data_type; /* xfer data type */
unsigned char convert_mono_stereo;
--
1.5.6.3
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