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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright © 2008 Rafaël Carré
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
#include "audio.h"
#include "string.h"
#include "as3525.h"
#include "pl081.h"
#include "dma-target.h"
#include "clock-target.h"
#include "panic.h"
#include "as3514.h"
#include "audiohw.h"
#include "mmu-arm.h"
#define MAX_TRANSFER (4*((1<<11)-1)) /* maximum data we can transfer via DMA
* i.e. 32 bits at once (size of I2SO_DATA)
* and the number of 32bits words has to
* fit in 11 bits of DMA register */
static unsigned char *dma_start_addr;
static size_t dma_size; /* in 4*32 bits */
static void dma_callback(void);
static int locked = 0;
/* Mask the DMA interrupt */
void pcm_play_lock(void)
{
if(++locked == 1)
VIC_INT_EN_CLEAR = INTERRUPT_DMAC;
}
/* Unmask the DMA interrupt if enabled */
void pcm_play_unlock(void)
{
if(--locked == 0)
VIC_INT_ENABLE |= INTERRUPT_DMAC;
}
static void play_start_pcm(void)
{
const unsigned char* addr = dma_start_addr;
size_t size = dma_size;
if(size > MAX_TRANSFER)
size = MAX_TRANSFER;
if((unsigned int)dma_start_addr & 3)
panicf("unaligned pointer!");
dma_size -= size;
dma_start_addr += size;
CGU_PERI |= CGU_I2SOUT_APB_CLOCK_ENABLE;
CGU_AUDIO |= (1<<11);
clean_dcache_range((void*)addr, size); /* force write back */
dma_enable_channel(1, (void*)addr, (void*)I2SOUT_DATA, DMA_PERI_I2SOUT,
DMAC_FLOWCTRL_DMAC_MEM_TO_PERI, true, false, size >> 2, DMA_S1,
dma_callback);
}
static void dma_callback(void)
{
if(!dma_size)
{
register pcm_more_callback_type get_more = pcm_callback_for_more;
if(get_more)
get_more(&dma_start_addr, &dma_size);
}
if(!dma_size)
{
pcm_play_dma_stop();
pcm_play_dma_stopped_callback();
}
else
play_start_pcm();
}
void pcm_play_dma_start(const void *addr, size_t size)
{
dma_size = size;
dma_start_addr = (unsigned char*)addr;
dma_retain();
play_start_pcm();
}
void pcm_play_dma_stop(void)
{
dma_disable_channel(1);
dma_size = 0;
dma_release();
CGU_PERI &= ~CGU_I2SOUT_APB_CLOCK_ENABLE;
CGU_AUDIO &= ~(1<<11);
}
void pcm_play_dma_pause(bool pause)
{
if(pause)
dma_disable_channel(1);
else
play_start_pcm();
}
void pcm_play_dma_init(void)
{
CGU_PERI |= CGU_I2SOUT_APB_CLOCK_ENABLE;
/* clock source PLLA, minimal frequency */
CGU_AUDIO |= (511<<2) | (1<<0);
I2SOUT_CONTROL |= (1<<6) ; /* enable dma */
I2SOUT_CONTROL |= (1<<3) ; /* stereo */
I2SOUT_CONTROL &= ~(1<<2); /* 16 bit samples */
audiohw_preinit();
}
void pcm_postinit(void)
{
audiohw_postinit();
}
void pcm_dma_apply_settings(void)
{
unsigned long frequency = pcm_sampr;
const int divider = (((AS3525_PLLA_FREQ/128) + (frequency/2)) / frequency) - 1;
if(divider < 0 || divider > 511)
panicf("unsupported frequency %ld", frequency);
int cgu_audio = CGU_AUDIO; /* read register */
cgu_audio &= ~(511 << 2); /* clear i2sout divider */
cgu_audio |= divider << 2; /* set new i2sout divider */
#if 0
cgu_audio &= ~(511 << 14); /* clear i2sin divider */
cgu_audio |= divider << 14; /* set new i2sin divider */
#endif
CGU_AUDIO = cgu_audio; /* write back register */
}
size_t pcm_get_bytes_waiting(void)
{
return dma_size;
}
const void * pcm_play_dma_get_peak_buffer(int *count)
{
*count = dma_size >> 2;
return (const void*)dma_start_addr;
}
#ifdef HAVE_PCM_DMA_ADDRESS
void * pcm_dma_addr(void *addr)
{
if (addr != NULL)
addr = UNCACHED_ADDR(addr);
return addr;
}
#endif
/****************************************************************************
** Recording DMA transfer
**/
#ifdef HAVE_RECORDING
void pcm_rec_lock(void)
{
}
void pcm_rec_unlock(void)
{
}
void pcm_record_more(void *start, size_t size)
{
(void)start;
(void)size;
}
void pcm_rec_dma_stop(void)
{
}
void pcm_rec_dma_start(void *addr, size_t size)
{
(void)addr;
(void)size;
}
void pcm_rec_dma_close(void)
{
}
void pcm_rec_dma_init(void)
{
}
const void * pcm_rec_dma_get_peak_buffer(int *count)
{
(void)count;
}
#endif /* HAVE_RECORDING */
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