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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Gigabeat S specific code for the WM8978 codec
*
* Copyright (C) 2008 Michael Sevakis
*
* 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 "config.h"
#include "system.h"
#include "kernel.h"
#include "sound.h"
#include "wmcodec.h"
#include "i2c-imx31.h"
/* NOTE: Some port-specific bits will have to be moved away (node and GPIO
* writes) for cleanest implementation. */
static struct i2c_node wm8978_i2c_node =
{
.num = I2C1_NUM,
.ifdr = I2C_IFDR_DIV192, /* 66MHz/.4MHz = 165, closest = 192 = 343750Hz */
/* Just hard-code for now - scaling may require
* updating */
.addr = WMC_I2C_ADDR,
};
void audiohw_init(void)
{
/* How SYSCLK for codec is derived (USBPLL=338.688MHz).
*
* SSI post dividers (SSI2 PODF=4, SSI2 PRE PODF=0):
* 338688000Hz / 5 = 67737600Hz = ssi2_clk
*
* SSI bit clock dividers (DIV2=1, PSR=0, PM=0):
* ssi2_clk / 4 = 16934400Hz = INT_BIT_CLK (MCLK)
*
* WM Codec post divider (MCLKDIV=1.5):
* INT_BIT_CLK (MCLK) / 1.5 = 11289600Hz = 256*fs = SYSCLK
*/
imx31_regmod32(&CLKCTL_PDR1,
PDR1_SSI1_PODFw(64-1) | PDR1_SSI2_PODFw(5-1) |
PDR1_SSI1_PRE_PODFw(8-1) | PDR1_SSI2_PRE_PODFw(1-1),
PDR1_SSI1_PODF | PDR1_SSI2_PODF |
PDR1_SSI1_PRE_PODF | PDR1_SSI2_PRE_PODF);
i2c_enable_node(&wm8978_i2c_node, true);
audiohw_preinit();
GPIO3_DR |= (1 << 21); /* Turn on analogue LDO */
}
void audiohw_enable_headphone_jack(bool enable)
{
if (enable)
{
GPIO3_DR |= (1 << 22); /* Turn on headphone jack output */
}
else
{
GPIO3_DR &= ~(1 << 22); /* Turn off headphone jack output */
}
}
void wmcodec_write(int reg, int data)
{
unsigned char d[2];
/* |aaaaaaad|dddddddd| */
d[0] = (reg << 1) | ((data & 0x100) >> 8);
d[1] = data;
i2c_write(&wm8978_i2c_node, d, 2);
}
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