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/*
* (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
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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
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