121 lines
3.1 KiB
C
121 lines
3.1 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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* Physical interface of the Philips TEA5767 in Samsung YH-92x
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*
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* Copyright (C) 2014 by Szymon Dziok
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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 "cpu.h"
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#include "fmradio_3wire.h"
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#define CLOCK_EN GPIO_SET_BITWISE(GPIOL_ENABLE, 0x10)
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#define CLOCK_OUT GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x10)
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#define CLOCK_LO GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x10)
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#define CLOCK_HI GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x10)
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#define DATA (GPIOL_INPUT_VAL & 0x08)
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#define DATA_EN GPIO_SET_BITWISE(GPIOL_ENABLE, 0x08)
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#define DATA_IN GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_EN, 0x08)
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#define DATA_OUT GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x08)
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#define DATA_LO GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x08)
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#define DATA_HI GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x08)
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#define READWRITE_EN GPIO_SET_BITWISE(GPIOL_ENABLE, 0x01)
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#define READWRITE_OUT GPIO_SET_BITWISE(GPIOL_OUTPUT_EN, 0x01)
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#define READWRITE_LO GPIO_CLEAR_BITWISE(GPIOL_OUTPUT_VAL, 0x01)
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#define READWRITE_HI GPIO_SET_BITWISE(GPIOL_OUTPUT_VAL, 0x01)
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#define DELAY1 udelay(1)
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#define DELAY2 udelay(2)
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void fmradio_3wire_init(void)
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{
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READWRITE_EN;
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READWRITE_OUT;
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DATA_EN;
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DATA_IN;
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CLOCK_EN;
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CLOCK_HI;
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CLOCK_OUT;
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DELAY2;
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}
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int fmradio_3wire_write(const unsigned char* buf)
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{
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int i, j;
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CLOCK_LO;
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READWRITE_LO;
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DELAY2;
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READWRITE_HI;
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DELAY1;
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DATA_OUT;
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/* 5 bytes to the tuner */
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for (j = 0; j < 5; j++)
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{
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for (i = 7; i >= 0; i--)
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{
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if ((buf[j] >> i) & 0x1) DATA_HI;
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else DATA_LO;
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DELAY1;
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CLOCK_HI;
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DELAY2;
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CLOCK_LO;
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DELAY1;
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}
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}
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READWRITE_LO;
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return j;
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}
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int fmradio_3wire_read(unsigned char* buf)
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{
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int i, j;
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CLOCK_LO;
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READWRITE_HI;
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DELAY2;
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READWRITE_LO;
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DELAY2;
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DATA_IN;
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/* 5 bytes from the tuner */
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for (j = 0; j < 5; j++)
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{
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buf[j] = 0;
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for (i = 7; i >= 0; i--)
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{
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buf[j] |= ((DATA >> 3) << i);
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CLOCK_HI;
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DELAY2;
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CLOCK_LO;
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DELAY2;
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}
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}
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READWRITE_HI;
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return j;
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}
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