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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2011
* Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
*/
#include <common.h>
#include <i2c.h>
#include <asm/io.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include "../common/common.h"
static void i2c_write_start_seq(void)
{
struct fsl_i2c_base *base;
base = (struct fsl_i2c_base *)(CONFIG_SYS_IMMR +
CONFIG_SYS_FSL_I2C_OFFSET);
udelay(DELAY_ABORT_SEQ);
out_8(&base->cr, (I2C_CR_MEN | I2C_CR_MSTA));
udelay(DELAY_ABORT_SEQ);
out_8(&base->cr, (I2C_CR_MEN));
}
int i2c_make_abort(void)
{
struct fsl_i2c_base *base;
base = (struct fsl_i2c_base *)(CONFIG_SYS_IMMR +
CONFIG_SYS_FSL_I2C_OFFSET);
uchar last;
int nbr_read = 0;
int i = 0;
int ret = 0;
/* wait after each operation to finsh with a delay */
out_8(&base->cr, (I2C_CR_MSTA));
udelay(DELAY_ABORT_SEQ);
out_8(&base->cr, (I2C_CR_MEN | I2C_CR_MSTA));
udelay(DELAY_ABORT_SEQ);
in_8(&base->dr);
udelay(DELAY_ABORT_SEQ);
last = in_8(&base->dr);
nbr_read++;
/*
* do read until the last bit is 1, but stop if the full eeprom is
* read.
*/
while (((last & 0x01) != 0x01) &&
(nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) {
udelay(DELAY_ABORT_SEQ);
last = in_8(&base->dr);
nbr_read++;
}
if ((last & 0x01) != 0x01)
ret = -2;
if ((last != 0xff) || (nbr_read > 1))
printf("[INFO] i2c abort after %d bytes (0x%02x)\n",
nbr_read, last);
udelay(DELAY_ABORT_SEQ);
out_8(&base->cr, (I2C_CR_MEN));
udelay(DELAY_ABORT_SEQ);
/* clear status reg */
out_8(&base->sr, 0);
for (i = 0; i < 5; i++)
i2c_write_start_seq();
if (ret != 0)
printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n",
nbr_read, last);
return ret;
}
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