blob: c961937530ac6945bb33e1021004b5f7a40cc5f6 [file] [log] [blame]
Holger Bruncke792aff2011-09-14 10:54:12 +02001/*
2 * (C) Copyright 2011
3 * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
Holger Bruncke792aff2011-09-14 10:54:12 +02006 */
7
8#include <common.h>
9#include <i2c.h>
10#include <asm/io.h>
11#include <linux/ctype.h>
12#include "../common/common.h"
13
14static void i2c_write_start_seq(void)
15{
16 struct fsl_i2c *dev;
17 dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
18 udelay(DELAY_ABORT_SEQ);
19 out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
20 udelay(DELAY_ABORT_SEQ);
21 out_8(&dev->cr, (I2C_CR_MEN));
22}
23
24int i2c_make_abort(void)
25{
26 struct fsl_i2c *dev;
27 dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
Holger Bruncke792aff2011-09-14 10:54:12 +020028 uchar last;
29 int nbr_read = 0;
30 int i = 0;
31 int ret = 0;
32
33 /* wait after each operation to finsh with a delay */
34 out_8(&dev->cr, (I2C_CR_MSTA));
35 udelay(DELAY_ABORT_SEQ);
36 out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
37 udelay(DELAY_ABORT_SEQ);
Kim Phillips67eee062011-11-15 22:59:53 +000038 in_8(&dev->dr);
Holger Bruncke792aff2011-09-14 10:54:12 +020039 udelay(DELAY_ABORT_SEQ);
40 last = in_8(&dev->dr);
41 nbr_read++;
42
43 /*
44 * do read until the last bit is 1, but stop if the full eeprom is
45 * read.
46 */
47 while (((last & 0x01) != 0x01) &&
48 (nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) {
49 udelay(DELAY_ABORT_SEQ);
50 last = in_8(&dev->dr);
51 nbr_read++;
52 }
53 if ((last & 0x01) != 0x01)
54 ret = -2;
55 if ((last != 0xff) || (nbr_read > 1))
56 printf("[INFO] i2c abort after %d bytes (0x%02x)\n",
57 nbr_read, last);
58 udelay(DELAY_ABORT_SEQ);
59 out_8(&dev->cr, (I2C_CR_MEN));
60 udelay(DELAY_ABORT_SEQ);
61 /* clear status reg */
62 out_8(&dev->sr, 0);
63
64 for (i = 0; i < 5; i++)
65 i2c_write_start_seq();
66 if (ret != 0)
67 printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n",
68 nbr_read, last);
69
70 return ret;
71}