107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald, Dana Conrad
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "audiohw.h"
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#include "system.h"
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#include "pcm_sampr.h"
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#include "aic-x1000.h"
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#include "i2c-x1000.h"
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#include "gpio-x1000.h"
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#include "logf.h"
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/* Audio path appears to be:
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* DAC --> HP Amp --> Stereo Switch --> HP OUT
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* \--> LO OUT
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*
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* The real purpose of the Stereo Switch is not clear.
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* It appears to switch sources between the HP amp and something,
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* likely something unimplemented. */
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void audiohw_init(void)
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{
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/* explicitly mute everything */
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gpio_set_level(GPIO_MAX97220_SHDN, 0);
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gpio_set_level(GPIO_ISL54405_MUTE, 1);
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gpio_set_level(GPIO_PCM5102A_XMIT, 0);
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aic_set_play_last_sample(true);
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aic_set_external_codec(true);
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aic_set_i2s_mode(AIC_I2S_MASTER_MODE);
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audiohw_set_frequency(HW_FREQ_48);
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aic_enable_i2s_master_clock(true);
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aic_enable_i2s_bit_clock(true);
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mdelay(10);
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/* power on DAC and HP Amp */
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gpio_set_level(GPIO_PCM5102A_ANALOG_PWR, 1);
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gpio_set_level(GPIO_MAX97220_POWER, 1);
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}
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void audiohw_postinit(void)
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{
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/*
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* enable playback, fill FIFO buffer with -1 to prevent
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* the DAC from auto-muting, wait, and then stop playback.
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* This seems to completely prevent power-on or first-track
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* clicking.
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*/
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jz_writef(AIC_CCR, ERPL(1));
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for (int i = 0; i < 32; i++)
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{
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jz_write(AIC_DR, 0xFFFFFF);
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}
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/* Wait until all samples are through the FIFO. */
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while(jz_readf(AIC_SR, TFL) != 0);
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mdelay(20); /* This seems to silence the power-on click */
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jz_writef(AIC_CCR, ERPL(0));
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/* unmute - attempt to make power-on pop-free */
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gpio_set_level(GPIO_ISL54405_SEL, 0);
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gpio_set_level(GPIO_MAX97220_SHDN, 1);
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mdelay(10);
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gpio_set_level(GPIO_PCM5102A_XMIT, 1);
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mdelay(10);
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gpio_set_level(GPIO_ISL54405_MUTE, 0);
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}
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/* TODO: get shutdown just right according to dac datasheet */
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void audiohw_close(void)
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{
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/* mute - attempt to make power-off pop-free */
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gpio_set_level(GPIO_ISL54405_MUTE, 1);
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mdelay(10);
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gpio_set_level(GPIO_PCM5102A_XMIT, 0);
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mdelay(10);
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gpio_set_level(GPIO_MAX97220_SHDN, 0);
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}
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void audiohw_set_frequency(int fsel)
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{
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int sampr = hw_freq_sampr[fsel];
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int mult = 256;
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aic_enable_i2s_bit_clock(false);
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aic_set_i2s_clock(X1000_CLK_SCLK_A, sampr, mult);
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aic_enable_i2s_bit_clock(true);
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}
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