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9e2c85e076
This is part of the preparation to add support for iPod Nano 3G and Nano 4G. There are some optimisations left, like merging similar blocks of registers that share the same layout, but the base address have changed between SoC generations. Change-Id: I4f06727b4061977141b65d39ae19591bd5b29680
146 lines
3.6 KiB
C
146 lines
3.6 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) 2009 by Bertrik Sikken
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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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/*
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FM radio i2c interface, allows the radio driver to talk to the tuner chip.
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It is implemented using the generic i2c driver, which does "bit-banged"
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I2C with a couple of GPIO pins.
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*/
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#include "config.h"
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#include "inttypes.h"
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#include "s5l87xx.h"
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#include "generic_i2c.h"
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#include "fmradio_i2c.h"
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#define I2C_GPIO PDAT3
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#define I2C_GPIO_DIR PCON3
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#define I2C_SCL_PIN 4
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#define I2C_SDA_PIN 2
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#define SCL_DIR_MASK (0xF<<(4*I2C_SCL_PIN))
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#define SCL_DIR_OUT (1<<(4*I2C_SCL_PIN))
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#define SCL_DIR_IN 0
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#define SDA_DIR_MASK (0xF<<(4*I2C_SDA_PIN))
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#define SDA_DIR_OUT (1<<(4*I2C_SDA_PIN))
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#define SDA_DIR_IN 0
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static int fm_i2c_bus;
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static void fm_scl_hi(void)
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{
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I2C_GPIO |= 1 << I2C_SCL_PIN;
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}
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static void fm_scl_lo(void)
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{
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I2C_GPIO &= ~(1 << I2C_SCL_PIN);
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}
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static void fm_sda_hi(void)
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{
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I2C_GPIO |= 1 << I2C_SDA_PIN;
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}
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static void fm_sda_lo(void)
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{
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I2C_GPIO &= ~(1 << I2C_SDA_PIN);
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}
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static void fm_sda_input(void)
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{
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I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SDA_DIR_MASK) | SDA_DIR_IN;
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}
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static void fm_sda_output(void)
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{
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I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SDA_DIR_MASK) | SDA_DIR_OUT;
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}
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static void fm_scl_input(void)
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{
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I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SCL_DIR_MASK) | SCL_DIR_IN;
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}
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static void fm_scl_output(void)
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{
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I2C_GPIO_DIR = (I2C_GPIO_DIR & ~SCL_DIR_MASK) | SCL_DIR_OUT;
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}
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static int fm_sda(void)
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{
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return (I2C_GPIO & (1 << I2C_SDA_PIN));
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}
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static int fm_scl(void)
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{
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return (I2C_GPIO & (1 << I2C_SCL_PIN));
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}
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/* simple and crude delay, used for all delays in the generic i2c driver */
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static void fm_delay(void)
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{
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volatile int i;
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/* this loop is uncalibrated and could use more sophistication */
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for (i = 0; i < 20; i++) {
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}
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}
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/* interface towards the generic i2c driver */
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static const struct i2c_interface fm_i2c_interface = {
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.scl_hi = fm_scl_hi,
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.scl_lo = fm_scl_lo,
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.sda_hi = fm_sda_hi,
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.sda_lo = fm_sda_lo,
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.sda_input = fm_sda_input,
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.sda_output = fm_sda_output,
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.scl_input = fm_scl_input,
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.scl_output = fm_scl_output,
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.scl = fm_scl,
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.sda = fm_sda,
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.delay_hd_sta = fm_delay,
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.delay_hd_dat = fm_delay,
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.delay_su_dat = fm_delay,
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.delay_su_sto = fm_delay,
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.delay_su_sta = fm_delay,
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.delay_thigh = fm_delay
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};
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/* initialise i2c for fmradio */
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void fmradio_i2c_init(void)
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{
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fm_i2c_bus = i2c_add_node(&fm_i2c_interface);
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}
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int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
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{
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return i2c_write_data(fm_i2c_bus, address, -1, buf, count);
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}
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int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
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{
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return i2c_read_data(fm_i2c_bus, address, -1, buf, count);
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}
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