blob: 8df92d8874aa415f16d8ebe44497af9d667fb9c9 [file] [log] [blame]
Holger Brunck015a60f2011-09-14 10:54:12 +02001/*
2 * (C) Copyright 2011
3 * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
25#include <i2c.h>
26#include <asm/io.h>
27#include <linux/ctype.h>
28#include "../common/common.h"
29
30static void i2c_write_start_seq(void)
31{
32 struct fsl_i2c *dev;
33 dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
34 udelay(DELAY_ABORT_SEQ);
35 out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
36 udelay(DELAY_ABORT_SEQ);
37 out_8(&dev->cr, (I2C_CR_MEN));
38}
39
40int i2c_make_abort(void)
41{
42 struct fsl_i2c *dev;
43 dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
Holger Brunck015a60f2011-09-14 10:54:12 +020044 uchar last;
45 int nbr_read = 0;
46 int i = 0;
47 int ret = 0;
48
49 /* wait after each operation to finsh with a delay */
50 out_8(&dev->cr, (I2C_CR_MSTA));
51 udelay(DELAY_ABORT_SEQ);
52 out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
53 udelay(DELAY_ABORT_SEQ);
Kim Phillips74351472011-11-15 22:59:53 +000054 in_8(&dev->dr);
Holger Brunck015a60f2011-09-14 10:54:12 +020055 udelay(DELAY_ABORT_SEQ);
56 last = in_8(&dev->dr);
57 nbr_read++;
58
59 /*
60 * do read until the last bit is 1, but stop if the full eeprom is
61 * read.
62 */
63 while (((last & 0x01) != 0x01) &&
64 (nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) {
65 udelay(DELAY_ABORT_SEQ);
66 last = in_8(&dev->dr);
67 nbr_read++;
68 }
69 if ((last & 0x01) != 0x01)
70 ret = -2;
71 if ((last != 0xff) || (nbr_read > 1))
72 printf("[INFO] i2c abort after %d bytes (0x%02x)\n",
73 nbr_read, last);
74 udelay(DELAY_ABORT_SEQ);
75 out_8(&dev->cr, (I2C_CR_MEN));
76 udelay(DELAY_ABORT_SEQ);
77 /* clear status reg */
78 out_8(&dev->sr, 0);
79
80 for (i = 0; i < 5; i++)
81 i2c_write_start_seq();
82 if (ret != 0)
83 printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n",
84 nbr_read, last);
85
86 return ret;
87}