- 根目录:
- sound
- soc
- davinci
- davinci-pcm.c
/*
* ALSA PCM interface for the TI DAVINCI processor
*
* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
* added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky@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
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/genalloc.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <asm/dma.h>
#include "davinci-pcm.h"
#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
#define DAVINCI_PCM_FMTBITS (\
SNDRV_PCM_FMTBIT_S8 |\
SNDRV_PCM_FMTBIT_U8 |\
SNDRV_PCM_FMTBIT_S16_LE |\
SNDRV_PCM_FMTBIT_S16_BE |\
SNDRV_PCM_FMTBIT_U16_LE |\
SNDRV_PCM_FMTBIT_U16_BE |\
SNDRV_PCM_FMTBIT_S24_LE |\
SNDRV_PCM_FMTBIT_S24_BE |\
SNDRV_PCM_FMTBIT_U24_LE |\
SNDRV_PCM_FMTBIT_U24_BE |\
SNDRV_PCM_FMTBIT_S32_LE |\
SNDRV_PCM_FMTBIT_S32_BE |\
SNDRV_PCM_FMTBIT_U32_LE |\
SNDRV_PCM_FMTBIT_U32_BE)
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 | SNDRV_PCM_INFO_RESUME|
SNDRV_PCM_INFO_BATCH),
.formats = DAVINCI_PCM_FMTBITS,
.rates = SNDRV_PCM_RATE_8000_192000 | SNDRV_PCM_RATE_KNOT,
.rate_min = 8000,
.rate_max = 192000,
.channels_min = 2,
.channels_max = 384,
.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 |
SNDRV_PCM_INFO_BATCH),
.formats = DAVINCI_PCM_FMTBITS,
.rates = SNDRV_PCM_RATE_8000_192000 | SNDRV_PCM_RATE_KNOT,
.rate_min = 8000,
.rate_max = 192000,
.channels_min = 2,
.channels_max = 384,
.buffer_bytes_max = 128 * 1024,
.period_bytes_min = 32,
.period_bytes_max = 8 * 1024,
.periods_min = 16,
.periods_max = 255,
.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;
};
static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
prtd->period++;
if (unlikely(prtd->period >= runtime->periods))
prtd->period = 0;
}
static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
prtd->period = 0;
}
/*
* 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;
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int period_size;
unsigned int dma_offset;
dma_addr_t dma_pos;
dma_addr_t src, dst;
unsigned short src_bidx, dst_bidx;
unsigned short src_cidx, dst_cidx;
unsigned int data_type;
unsigned short acnt;
unsigned int count;
unsigned int fifo_level;
period_size = snd_pcm_lib_period_bytes(substream);
dma_offset = prtd->period * period_size;
dma_pos = runtime->dma_addr + dma_offset;
fifo_level = prtd->params->fifo_level;
pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
"dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
period_size);
data_type = prtd->params->data_type;
count = period_size / data_type;
if (fifo_level)
count /= fifo_level;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
src = dma_pos;
dst = prtd->params->dma_addr;
src_bidx = data_type;
dst_bidx = 4;
src_cidx = data_type * fifo_level;
dst_cidx = 0;
} else {
src = prtd->params->dma_addr;
dst = dma_pos;
src_bidx = 0;
dst_bidx = data_type;
src_cidx = 0;
dst_cidx = data_type * fifo_level;
}
acnt = prtd->params->acnt;
edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
if (!fifo_level)
edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
ASYNC);
else
edma_set_transfer_params(prtd->asp_link[0], acnt,
fifo_level,
count, fifo_level,
ABSYNC);
}
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)) {
spin_lock(&prtd->lock);
if (prtd->ram_channel < 0) {
/* No ping/pong must fix up link dma data*/
davinci_pcm_enqueue_dma(substream);
}
davinci_pcm_period_elapsed(substream);
spin_unlock(&prtd->lock);
snd_pcm_period_elapsed(substream);
}
}
#ifdef CONFIG_GENERIC_ALLOCATOR
static int allocate_sram(struct snd_pcm_substream *substream,
struct gen_pool *sram_pool, 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 = (void *)gen_pool_alloc(sram_pool, size);
if (!iram_virt)
goto exit1;
iram_phys = gen_pool_virt_to_phys(sram_pool, (unsigned)iram_virt);
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)
gen_pool_free(sram_pool, (unsigned)iram_virt, size);
exit1:
return -ENOMEM;
}
static void davinci_free_sram(struct snd_pcm_substream *substream,
struct snd_dma_buffer *iram_dma)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
struct gen_pool *sram_pool = prtd->params->sram_pool;
gen_pool_free(sram_pool, (unsigned) iram_dma->area, iram_dma->bytes);
}
#else
static int allocate_sram(struct snd_pcm_substream *substream,
struct gen_pool *sram_pool, unsigned size,
struct snd_pcm_hardware *ppcm)
{
return 0;
}
static void davinci_free_sram(struct snd_pcm_substream *substream,
struct snd_dma_buffer *iram_dma)
{
}
#endif
/*
* 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 *params = prtd->params;
unsigned int data_type = params->data_type;
unsigned int acnt = params->acnt;
/* divide by 2 for ping/pong */
unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
unsigned int fifo_level = prtd->params->fifo_level;
unsigned int count;
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(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
edma_set_src_index(prtd->asp_link[0], data_type,
data_type * fifo_level);
edma_set_src_index(prtd->asp_link[1], data_type,
data_type * fifo_level);
edma_set_src(prtd->ram_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(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
edma_set_dest_index(prtd->asp_link[0], data_type,
data_type * fifo_level);
edma_set_dest_index(prtd->asp_link[1], data_type,
data_type * fifo_level);
edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
}
if (!fifo_level) {
count = ping_size / data_type;
edma_set_transfer_params(prtd->asp_link[0], acnt, count,
1, 0, ASYNC);
edma_set_transfer_params(prtd->asp_link[1], acnt, count,
1, 0, ASYNC);
} else {
count = ping_size / (data_type * fifo_level);
edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
count, fifo_level, ABSYNC);
edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
count, fifo_level, ABSYNC);
}
edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
edma_set_transfer_params(prtd->ram_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 ret;
struct davinci_pcm_dma_params *params = prtd->params;
/* Request ram master channel */
ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
davinci_pcm_dma_irq, substream,
prtd->params->ram_chan_q);
if (ret < 0)
goto exit1;
/* Request ram link channel */
ret = prtd->ram_link = edma_alloc_slot(
EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
if (ret < 0)
goto exit2;
ret = prtd->asp_link[1] = edma_alloc_slot(
EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
if (ret < 0)
goto exit3;
prtd->ram_link2 = -1;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
ret = prtd->ram_link2 = edma_alloc_slot(
EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
if (ret < 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 = params->dma_addr; /* fifo */
} else {
asp_src_ping = params->dma_addr; /* fifo */
asp_dst_ping = iram_dma->addr;
}
/* ping */
edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
edma_set_src_index(prtd->asp_link[0], 0, 0);
edma_set_dest_index(prtd->asp_link[0], 0, 0);
edma_read_slot(prtd->asp_link[0], &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(prtd->asp_link[0], &prtd->asp_params);
/* pong */
edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
edma_set_src_index(prtd->asp_link[1], 0, 0);
edma_set_dest_index(prtd->asp_link[1], 0, 0);
edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
/* interrupt after every pong completion */
prtd->asp_params.opt |= TCINTEN | TCCHEN |
EDMA_TCC(prtd->ram_channel & 0x3f);
edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
/* ram */
edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
edma_set_dest(prtd->ram_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 ret;
}
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 davinci_pcm_dma_params *params = prtd->params;
int ret;
if (!params)
return -ENODEV;
/* Request asp master DMA channel */
ret = prtd->asp_channel = edma_alloc_channel(params->channel,
davinci_pcm_dma_irq, substream,
prtd->params->asp_chan_q);
if (ret < 0)
goto exit1;
/* Request asp link channels */
ret = prtd->asp_link[0] = edma_alloc_slot(
EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
if (ret < 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__);
}
/* Issue transfer completion IRQ when the channel completes a
* transfer, then always reload from the same slot (by a kind
* of loopback link). The completion IRQ handler will update
* the reload slot with a new buffer.
*
* REVISIT save p_ram here after setting up everything except
* 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], &prtd->asp_params);
prtd->asp_params.opt |= TCINTEN |
EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
return 0;
exit2:
edma_free_channel(prtd->asp_channel);
prtd->asp_channel = -1;
exit1:
return ret;
}
static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
int ret = 0;
spin_lock(&prtd->lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
edma_start(prtd->asp_channel);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
prtd->ram_channel >= 0) {
/* copy 1st iram buffer */
edma_start(prtd->ram_channel);
}
break;
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
edma_resume(prtd->asp_channel);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
edma_pause(prtd->asp_channel);
break;
default:
ret = -EINVAL;
break;
}
spin_unlock(&prtd->lock);
return ret;
}
static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
davinci_pcm_period_reset(substream);
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]");
/*
* There is a phase offset of 2 periods between the position
* used by dma setup and the position reported in the pointer
* function.
*
* The phase offset, when not using ping-pong buffers, is due to
* the two consecutive calls to davinci_pcm_enqueue_dma() below.
*
* Whereas here, with ping-pong buffers, the phase is due to
* there being an entire buffer transfer complete before the
* first dma completion event triggers davinci_pcm_dma_irq().
*/
davinci_pcm_period_elapsed(substream);
davinci_pcm_period_elapsed(substream);
return 0;
}
davinci_pcm_enqueue_dma(substream);
davinci_pcm_period_elapsed(substream);
/* Copy self-linked parameter RAM entry into master channel */
edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
edma_write_slot(prtd->asp_channel, &prtd->asp_params);
davinci_pcm_enqueue_dma(substream);
davinci_pcm_period_elapsed(substream);
return 0;
}
static snd_pcm_uframes_t
davinci_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct davinci_runtime_data *prtd = runtime->private_data;
unsigned int offset;
int asp_count;
unsigned int period_size = snd_pcm_lib_period_bytes(substream);
/*
* There is a phase offset of 2 periods between the position used by dma
* setup and the position reported in the pointer function. Either +2 in
* the dma setup or -2 here in the pointer function (with wrapping,
* both) accounts for this offset -- choose the latter since it makes
* the first-time setup clearer.
*/
spin_lock(&prtd->lock);
asp_count = prtd->period - 2;
spin_unlock(&prtd->lock);
if (asp_count < 0)
asp_count += runtime->periods;
asp_count *= period_size;
offset = bytes_to_frames(runtime, asp_count);
if (offset >= runtime->buffer_size)
offset = 0;
return offset;
}
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;
struct davinci_pcm_dma_params *params;
pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
if (!pa)
return -ENODEV;
params = &pa[substream->stream];
ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
&pcm_hardware_playback : &pcm_hardware_capture;
allocate_sram(substream, params->sram_pool, 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);
if (ret < 0)
return ret;
prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
if (prtd == NULL)
return -ENOMEM;
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;
ret = davinci_pcm_dma_request(substream);
if (ret) {
printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
kfree(prtd);
}
return ret;
}
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;
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);
return 0;
}
static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
return snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
}
static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
{
return snd_pcm_lib_free_pages(substream);
}
static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_pcm_runtime *runtime = substream->runtime;
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
runtime->dma_area,
runtime->dma_addr,
runtime->dma_bytes);
}
static struct snd_pcm_ops davinci_pcm_ops = {
.open = davinci_pcm_open,
.close = davinci_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = davinci_pcm_hw_params,
.hw_free = davinci_pcm_hw_free,
.prepare = davinci_pcm_prepare,
.trigger = davinci_pcm_trigger,
.pointer = davinci_pcm_pointer,
.mmap = davinci_pcm_mmap,
};
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;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
buf->private_data = NULL;
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
"size=%d\n", (void *) buf->area, (void *) buf->addr, size);
if (!buf->area)
return -ENOMEM;
buf->bytes = size;
return 0;
}
static void davinci_pcm_free(struct snd_pcm *pcm)
{
struct snd_pcm_substream *substream;
struct snd_dma_buffer *buf;
int stream;
for (stream = 0; stream < 2; stream++) {
struct snd_dma_buffer *iram_dma;
substream = pcm->streams[stream].substream;
if (!substream)
continue;
buf = &substream->dma_buffer;
if (!buf->area)
continue;
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
iram_dma = buf->private_data;
if (iram_dma) {
davinci_free_sram(substream, iram_dma);
kfree(iram_dma);
}
}
}
static u64 davinci_pcm_dmamask = DMA_BIT_MASK(32);
static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_card *card = rtd->card->snd_card;
struct snd_pcm *pcm = rtd->pcm;
int ret;
if (!card->dev->dma_mask)
card->dev->dma_mask = &davinci_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
ret = davinci_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK,
pcm_hardware_playback.buffer_bytes_max);
if (ret)
return ret;
}
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
ret = davinci_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE,
pcm_hardware_capture.buffer_bytes_max);
if (ret)
return ret;
}
return 0;
}
static struct snd_soc_platform_driver davinci_soc_platform = {
.ops = &davinci_pcm_ops,
.pcm_new = davinci_pcm_new,
.pcm_free = davinci_pcm_free,
};
int davinci_soc_platform_register(struct device *dev)
{
return snd_soc_register_platform(dev, &davinci_soc_platform);
}
EXPORT_SYMBOL_GPL(davinci_soc_platform_register);
void davinci_soc_platform_unregister(struct device *dev)
{
snd_soc_unregister_platform(dev);
}
EXPORT_SYMBOL_GPL(davinci_soc_platform_unregister);
MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
MODULE_LICENSE("GPL");