| Holger Brunck | 015a60f | 2011-09-14 10:54:12 +0200 | [diff] [blame^] | 1 | /* |
| 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 | |
| 30 | static 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 | |
| 40 | int i2c_make_abort(void) |
| 41 | { |
| 42 | struct fsl_i2c *dev; |
| 43 | dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET); |
| 44 | uchar dummy; |
| 45 | uchar last; |
| 46 | int nbr_read = 0; |
| 47 | int i = 0; |
| 48 | int ret = 0; |
| 49 | |
| 50 | /* wait after each operation to finsh with a delay */ |
| 51 | out_8(&dev->cr, (I2C_CR_MSTA)); |
| 52 | udelay(DELAY_ABORT_SEQ); |
| 53 | out_8(&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA)); |
| 54 | udelay(DELAY_ABORT_SEQ); |
| 55 | dummy = in_8(&dev->dr); |
| 56 | udelay(DELAY_ABORT_SEQ); |
| 57 | last = in_8(&dev->dr); |
| 58 | nbr_read++; |
| 59 | |
| 60 | /* |
| 61 | * do read until the last bit is 1, but stop if the full eeprom is |
| 62 | * read. |
| 63 | */ |
| 64 | while (((last & 0x01) != 0x01) && |
| 65 | (nbr_read < CONFIG_SYS_IVM_EEPROM_MAX_LEN)) { |
| 66 | udelay(DELAY_ABORT_SEQ); |
| 67 | last = in_8(&dev->dr); |
| 68 | nbr_read++; |
| 69 | } |
| 70 | if ((last & 0x01) != 0x01) |
| 71 | ret = -2; |
| 72 | if ((last != 0xff) || (nbr_read > 1)) |
| 73 | printf("[INFO] i2c abort after %d bytes (0x%02x)\n", |
| 74 | nbr_read, last); |
| 75 | udelay(DELAY_ABORT_SEQ); |
| 76 | out_8(&dev->cr, (I2C_CR_MEN)); |
| 77 | udelay(DELAY_ABORT_SEQ); |
| 78 | /* clear status reg */ |
| 79 | out_8(&dev->sr, 0); |
| 80 | |
| 81 | for (i = 0; i < 5; i++) |
| 82 | i2c_write_start_seq(); |
| 83 | if (ret != 0) |
| 84 | printf("[ERROR] i2c abort failed after %d bytes (0x%02x)\n", |
| 85 | nbr_read, last); |
| 86 | |
| 87 | return ret; |
| 88 | } |