74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2011
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* Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
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*/
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#include <common.h>
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#include <i2c.h>
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#include <asm/io.h>
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include "../common/common.h"
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static void i2c_write_start_seq(void)
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{
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struct fsl_i2c_base *base;
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base = (struct fsl_i2c_base *)(CONFIG_SYS_IMMR +
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CONFIG_SYS_I2C_OFFSET);
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udelay(DELAY_ABORT_SEQ);
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out_8(&base->cr, (I2C_CR_MEN | I2C_CR_MSTA));
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udelay(DELAY_ABORT_SEQ);
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out_8(&base->cr, (I2C_CR_MEN));
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}
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int i2c_make_abort(void)
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{
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struct fsl_i2c_base *base;
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base = (struct fsl_i2c_base *)(CONFIG_SYS_IMMR +
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CONFIG_SYS_I2C_OFFSET);
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uchar last;
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int nbr_read = 0;
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int i = 0;
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int ret = 0;
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/* wait after each operation to finsh with a delay */
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out_8(&base->cr, (I2C_CR_MSTA));
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udelay(DELAY_ABORT_SEQ);
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out_8(&base->cr, (I2C_CR_MEN | I2C_CR_MSTA));
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udelay(DELAY_ABORT_SEQ);
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in_8(&base->dr);
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udelay(DELAY_ABORT_SEQ);
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last = in_8(&base->dr);
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nbr_read++;
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/*
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* do read until the last bit is 1, but stop if the full eeprom is
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* read.
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*/
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while (((last & 0x01) != 0x01) &&
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(nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) {
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udelay(DELAY_ABORT_SEQ);
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last = in_8(&base->dr);
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nbr_read++;
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}
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if ((last & 0x01) != 0x01)
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ret = -2;
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if ((last != 0xff) || (nbr_read > 1))
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printf("[INFO] i2c abort after %d bytes (0x%02x)\n",
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nbr_read, last);
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udelay(DELAY_ABORT_SEQ);
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out_8(&base->cr, (I2C_CR_MEN));
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udelay(DELAY_ABORT_SEQ);
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/* clear status reg */
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out_8(&base->sr, 0);
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for (i = 0; i < 5; i++)
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i2c_write_start_seq();
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if (ret != 0)
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printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n",
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nbr_read, last);
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return ret;
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}
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