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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2021 Aidan MacDonald, Dana Conrad
*
* 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 "audiohw.h"
#include "system.h"
#include "pcm_sampr.h"
#include "aic-x1000.h"
#include "i2c-x1000.h"
#include "gpio-x1000.h"
#include "logf.h"
/* Audio path appears to be:
* DAC --> HP Amp --> Stereo Switch --> HP OUT
* \--> LO OUT
*
* The real purpose of the Stereo Switch is not clear.
* It appears to switch sources between the HP amp and something,
* likely something unimplemented. */
void audiohw_init(void)
{
/* explicitly mute everything */
gpio_set_level(GPIO_MAX97220_SHDN, 0);
gpio_set_level(GPIO_ISL54405_MUTE, 1);
gpio_set_level(GPIO_PCM5102A_XMIT, 0);
aic_set_play_last_sample(true);
aic_set_external_codec(true);
aic_set_i2s_mode(AIC_I2S_MASTER_MODE);
audiohw_set_frequency(HW_FREQ_48);
aic_set_play_last_sample(true);
aic_enable_i2s_master_clock(true);
aic_enable_i2s_bit_clock(true);
mdelay(10);
/* power on DAC and HP Amp */
gpio_set_level(GPIO_PCM5102A_ANALOG_PWR, 1);
gpio_set_level(GPIO_MAX97220_POWER, 1);
}
void audiohw_postinit(void)
{
/*
* enable playback, fill FIFO buffer with -1 to prevent
* the DAC from auto-muting, wait, and then stop playback.
* This seems to completely prevent power-on or first-track
* clicking.
*/
jz_writef(AIC_CCR, ERPL(1));
for (int i = 0; i < 32; i++)
{
jz_write(AIC_DR, 0xFFFFFF);
}
/* Wait until all samples are through the FIFO. */
while(jz_readf(AIC_SR, TFL) != 0);
mdelay(20); /* This seems to silence the power-on click */
jz_writef(AIC_CCR, ERPL(0));
/* unmute - attempt to make power-on pop-free */
gpio_set_level(GPIO_ISL54405_SEL, 0);
gpio_set_level(GPIO_MAX97220_SHDN, 1);
mdelay(10);
gpio_set_level(GPIO_PCM5102A_XMIT, 1);
mdelay(10);
gpio_set_level(GPIO_ISL54405_MUTE, 0);
}
/* TODO: get shutdown just right according to dac datasheet */
void audiohw_close(void)
{
/* mute - attempt to make power-off pop-free */
gpio_set_level(GPIO_ISL54405_MUTE, 1);
mdelay(10);
gpio_set_level(GPIO_PCM5102A_XMIT, 0);
mdelay(10);
gpio_set_level(GPIO_MAX97220_SHDN, 0);
}
void audiohw_set_frequency(int fsel)
{
int sampr = hw_freq_sampr[fsel];
int mult = 256;
aic_enable_i2s_bit_clock(false);
aic_set_i2s_clock(X1000_CLK_SCLK_A, sampr, mult);
aic_enable_i2s_bit_clock(true);
}
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