1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
|
|
* (C) Copyright 2011
|
|
* Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <i2c.h>
|
|
#include <asm/io.h>
|
|
#include <linux/ctype.h>
|
|
#include "../common/common.h"
|
|
|
|
static void i2c_write_start_seq(void)
|
|
{
|
|
struct fsl_i2c *dev;
|
|
dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
|
|
udelay(DELAY_ABORT_SEQ);
|
|
out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
|
|
udelay(DELAY_ABORT_SEQ);
|
|
out_8(&dev->cr, (I2C_CR_MEN));
|
|
}
|
|
|
|
int i2c_make_abort(void)
|
|
{
|
|
struct fsl_i2c *dev;
|
|
dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_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(&dev->cr, (I2C_CR_MSTA));
|
|
udelay(DELAY_ABORT_SEQ);
|
|
out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
|
|
udelay(DELAY_ABORT_SEQ);
|
|
in_8(&dev->dr);
|
|
udelay(DELAY_ABORT_SEQ);
|
|
last = in_8(&dev->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(&dev->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(&dev->cr, (I2C_CR_MEN));
|
|
udelay(DELAY_ABORT_SEQ);
|
|
/* clear status reg */
|
|
out_8(&dev->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;
|
|
}
|