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qi-6410-i2c-bitbang.patch
Signed-off-by: Andy Green <andy@openmoko.com>
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qiboot/include/i2c-bitbang-s3c6410.h
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qiboot/include/i2c-bitbang-s3c6410.h
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#include <i2c-bitbang.h>
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extern struct i2c_bitbang bb_s3c6410;
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* (C) Copyright 2007 OpenMoko, Inc.
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* Author: Andy Green <andy@openmoko.com>
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*
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* s3c24xx-specific i2c shared by, eg, GTA02 and GTA03
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* s3c24xx-specific i2c used by, eg, GTA02
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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 as
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qiboot/src/cpu/s3c6410/i2c-bitbang-s3c6410.c
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qiboot/src/cpu/s3c6410/i2c-bitbang-s3c6410.c
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/*
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* (C) Copyright 2007 OpenMoko, Inc.
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* Author: Andy Green <andy@openmoko.com>
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*
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* s3c6410-specific i2c
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <qi.h>
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#include <i2c-bitbang.h>
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#include <s3c6410.h>
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static char i2c_read_sda_s3c6410(void)
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{
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return !!(__REG(GPBDAT) & (1 << 6));
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}
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static void i2c_set_s3c6410(char clock, char data)
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{
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if (clock) /* SCL <- input */
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__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4)));
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else { /* SCL <- output 0 */
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__REG(GPBDAT) = (__REG(GPBDAT) & ~(1 << 5));
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__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4))) | (1 << (5 * 4));
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}
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if (data) /* SDA <- input */
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__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4)));
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else { /* SDA <- output 0 */
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__REG(GPBDAT) = (__REG(GPBDAT) & ~(1 << 6));
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__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4))) | (1 << (6 * 4));
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}
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}
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static void i2c_close_s3c6410(void)
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{
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/* set back to hardware I2C ready for Linux */
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__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4))) | (2 << (5 * 4));
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__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4))) | (2 << (6 * 4));
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}
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static void i2c_spin_s3c6410(void)
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{
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int n;
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for (n = 0; n < 1000; n++)
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__REG(GPBDAT) = __REG(GPBDAT);
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}
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struct i2c_bitbang bb_s3c6410 = {
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.read_sda = i2c_read_sda_s3c6410,
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.set = i2c_set_s3c6410,
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.spin = i2c_spin_s3c6410,
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.close = i2c_close_s3c6410,
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};
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