46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* (C) Copyright 2011
|
|
* Linaro
|
|
* Linus Walleij <linus.walleij@linaro.org>
|
|
* Register definitions for the External Bus Interface (EBI)
|
|
* found in the ARM Integrator AP and CP reference designs
|
|
*/
|
|
|
|
#ifndef __ARM_EBI_H
|
|
#define __ARM_EBI_H
|
|
|
|
#define EBI_BASE 0x12000000
|
|
|
|
#define EBI_CSR0_REG 0x00 /* CS0 = Boot ROM */
|
|
#define EBI_CSR1_REG 0x04 /* CS1 = Flash */
|
|
#define EBI_CSR2_REG 0x08 /* CS2 = SSRAM */
|
|
#define EBI_CSR3_REG 0x0C /* CS3 = Expansion memory */
|
|
/*
|
|
* The four upper bits are the waitstates for each chip select
|
|
* 0x00 = 2 cycles, 0x10 = 3 cycles, ... 0xe0 = 16 cycles, 0xf0 = 16 cycles
|
|
*/
|
|
#define EBI_CSR_WAIT_MASK 0xF0
|
|
/* Whether memory is synchronous or asynchronous */
|
|
#define EBI_CSR_SYNC_MASK 0xF7
|
|
#define EBI_CSR_ASYNC 0x00
|
|
#define EBI_CSR_SYNC 0x08
|
|
/* Whether memory is write enabled or not */
|
|
#define EBI_CSR_WREN_MASK 0xFB
|
|
#define EBI_CSR_WREN_DISABLE 0x00
|
|
#define EBI_CSR_WREN_ENABLE 0x04
|
|
/* Memory bit width for each chip select */
|
|
#define EBI_CSR_MEMSIZE_MASK 0xFC
|
|
#define EBI_CSR_MEMSIZE_8BIT 0x00
|
|
#define EBI_CSR_MEMSIZE_16BIT 0x01
|
|
#define EBI_CSR_MEMSIZE_32BIT 0x02
|
|
|
|
/*
|
|
* The lock register need to be written with 0xa05f before anything in the
|
|
* EBI can be changed.
|
|
*/
|
|
#define EBI_LOCK_REG 0x20
|
|
#define EBI_UNLOCK_MAGIC 0xA05F
|
|
|
|
#endif
|