| Linus Walleij | 701ed16 | 2011-11-09 06:15:59 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2011 |
| 3 | * Linaro |
| 4 | * Linus Walleij <linus.walleij@linaro.org> |
| 5 | * Register definitions for the External Bus Interface (EBI) |
| 6 | * found in the ARM Integrator AP and CP reference designs |
| 7 | * |
| 8 | * See file CREDITS for list of people who contributed to this |
| 9 | * project. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 24 | * MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #ifndef __ARM_EBI_H |
| 28 | #define __ARM_EBI_H |
| 29 | |
| 30 | #define EBI_BASE 0x12000000 |
| 31 | |
| 32 | #define EBI_CSR0_REG 0x00 /* CS0 = Boot ROM */ |
| 33 | #define EBI_CSR1_REG 0x04 /* CS1 = Flash */ |
| 34 | #define EBI_CSR2_REG 0x08 /* CS2 = SSRAM */ |
| 35 | #define EBI_CSR3_REG 0x0C /* CS3 = Expansion memory */ |
| 36 | /* |
| 37 | * The four upper bits are the waitstates for each chip select |
| 38 | * 0x00 = 2 cycles, 0x10 = 3 cycles, ... 0xe0 = 16 cycles, 0xf0 = 16 cycles |
| 39 | */ |
| 40 | #define EBI_CSR_WAIT_MASK 0xF0 |
| 41 | /* Whether memory is synchronous or asynchronous */ |
| 42 | #define EBI_CSR_SYNC_MASK 0xF7 |
| 43 | #define EBI_CSR_ASYNC 0x00 |
| 44 | #define EBI_CSR_SYNC 0x08 |
| 45 | /* Whether memory is write enabled or not */ |
| 46 | #define EBI_CSR_WREN_MASK 0xFB |
| 47 | #define EBI_CSR_WREN_DISABLE 0x00 |
| 48 | #define EBI_CSR_WREN_ENABLE 0x04 |
| 49 | /* Memory bit width for each chip select */ |
| 50 | #define EBI_CSR_MEMSIZE_MASK 0xFC |
| 51 | #define EBI_CSR_MEMSIZE_8BIT 0x00 |
| 52 | #define EBI_CSR_MEMSIZE_16BIT 0x01 |
| 53 | #define EBI_CSR_MEMSIZE_32BIT 0x02 |
| 54 | |
| 55 | /* |
| 56 | * The lock register need to be written with 0xa05f before anything in the |
| 57 | * EBI can be changed. |
| 58 | */ |
| 59 | #define EBI_LOCK_REG 0x20 |
| 60 | #define EBI_UNLOCK_MAGIC 0xA05F |
| 61 | |
| 62 | #endif |