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 63