e48cece75c
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20444 a1c6a512-1295-4272-9138-f99709370657
83 lines
2.8 KiB
C
83 lines
2.8 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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* Gigabeat S specific code for the WM8978 codec
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*
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* Copyright (C) 2008 Michael Sevakis
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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 "config.h"
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#include "system.h"
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#include "kernel.h"
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#include "sound.h"
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#include "wmcodec.h"
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#include "i2c-imx31.h"
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/* NOTE: Some port-specific bits will have to be moved away (node and GPIO
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* writes) for cleanest implementation. */
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static struct i2c_node wm8978_i2c_node =
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{
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.num = I2C1_NUM,
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.ifdr = I2C_IFDR_DIV192, /* 66MHz/.4MHz = 165, closest = 192 = 343750Hz */
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/* Just hard-code for now - scaling may require
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* updating */
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.addr = WMC_I2C_ADDR,
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};
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void audiohw_init(void)
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{
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/* How SYSCLK for codec is derived (USBPLL=338.688MHz).
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*
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* SSI post dividers (SSI2 PODF=4, SSI2 PRE PODF=0):
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* 338688000Hz / 5 = 67737600Hz = ssi1_clk
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*
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* SSI bit clock dividers (DIV2=1, PSR=0, PM=0):
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* ssi1_clk / 4 = 16934400Hz = INT_BIT_CLK (MCLK)
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*
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* WM Codec post divider (MCLKDIV=1.5):
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* INT_BIT_CLK (MCLK) / 1.5 = 11289600Hz = 256*fs = SYSCLK
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*/
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imx31_regmod32(&CCM_PDR1,
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((1-1) << CCM_PDR1_SSI1_PRE_PODF_POS) |
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((5-1) << CCM_PDR1_SSI1_PODF_POS) |
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((8-1) << CCM_PDR1_SSI2_PRE_PODF_POS) |
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((64-1) << CCM_PDR1_SSI2_PODF_POS),
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CCM_PDR1_SSI1_PODF | CCM_PDR1_SSI2_PODF |
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CCM_PDR1_SSI1_PRE_PODF | CCM_PDR1_SSI2_PRE_PODF);
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i2c_enable_node(&wm8978_i2c_node, true);
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audiohw_preinit();
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imx31_regset32(&GPIO3_DR, (1 << 21)); /* Turn on analogue LDO */
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}
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void audiohw_enable_headphone_jack(bool enable)
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{
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/* Turn headphone jack output on or off. */
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imx31_regmod32(&GPIO3_DR, enable ? (1 << 22) : 0, (1 << 22));
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}
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void wmcodec_write(int reg, int data)
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{
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unsigned char d[2];
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/* |aaaaaaad|dddddddd| */
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d[0] = (reg << 1) | ((data & 0x100) >> 8);
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d[1] = data;
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i2c_write(&wm8978_i2c_node, d, 2);
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}
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