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qi-6410-i2c-bitbang.patch

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Signed-off-by: Andy Green <andy@openmoko.com>
This commit is contained in:
Andy Green 2008-11-28 10:16:42 +00:00 committed by Andy Green
parent acaa3b4507
commit 31f03046d5
3 changed files with 73 additions and 1 deletions
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3
qiboot/include/i2c-bitbang-s3c6410.h Normal file
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#include <i2c-bitbang.h>
extern struct i2c_bitbang bb_s3c6410;

2
qiboot/src/cpu/s3c2442/i2c-bitbang-s3c24xx.c
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* (C) Copyright 2007 OpenMoko, Inc.
* Author: Andy Green <andy@openmoko.com>
*
* s3c24xx-specific i2c shared by, eg, GTA02 and GTA03
* s3c24xx-specific i2c used by, eg, GTA02
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as

69
qiboot/src/cpu/s3c6410/i2c-bitbang-s3c6410.c Normal file
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/*
* (C) Copyright 2007 OpenMoko, Inc.
* Author: Andy Green <andy@openmoko.com>
*
* s3c6410-specific i2c
*
* 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <qi.h>
#include <i2c-bitbang.h>
#include <s3c6410.h>
static char i2c_read_sda_s3c6410(void)
{
return !!(__REG(GPBDAT) & (1 << 6));
}
static void i2c_set_s3c6410(char clock, char data)
{
if (clock) /* SCL <- input */
__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4)));
else { /* SCL <- output 0 */
__REG(GPBDAT) = (__REG(GPBDAT) & ~(1 << 5));
__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4))) | (1 << (5 * 4));
}
if (data) /* SDA <- input */
__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4)));
else { /* SDA <- output 0 */
__REG(GPBDAT) = (__REG(GPBDAT) & ~(1 << 6));
__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4))) | (1 << (6 * 4));
}
}
static void i2c_close_s3c6410(void)
{
/* set back to hardware I2C ready for Linux */
__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (5 * 4))) | (2 << (5 * 4));
__REG(GPBCON) = (__REG(GPBCON) & ~(3 << (6 * 4))) | (2 << (6 * 4));
}
static void i2c_spin_s3c6410(void)
{
int n;
for (n = 0; n < 1000; n++)
__REG(GPBDAT) = __REG(GPBDAT);
}
struct i2c_bitbang bb_s3c6410 = {
.read_sda = i2c_read_sda_s3c6410,
.set = i2c_set_s3c6410,
.spin = i2c_spin_s3c6410,
.close = i2c_close_s3c6410,
};