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1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * (C) Copyright 2011
4  * Linaro
5  * Linus Walleij <linus.walleij@linaro.org>
6  * Register definitions for the External Bus Interface (EBI)
7  * found in the ARM Integrator AP and CP reference designs
8  */
9 
10 #ifndef __ARM_EBI_H
11 #define __ARM_EBI_H
12 
13 #define EBI_BASE		0x12000000
14 
15 #define EBI_CSR0_REG		0x00 /* CS0 = Boot ROM */
16 #define EBI_CSR1_REG		0x04 /* CS1 = Flash */
17 #define EBI_CSR2_REG		0x08 /* CS2 = SSRAM */
18 #define EBI_CSR3_REG		0x0C /* CS3 = Expansion memory */
19 /*
20  * The four upper bits are the waitstates for each chip select
21  * 0x00 = 2 cycles, 0x10 = 3 cycles, ... 0xe0 = 16 cycles, 0xf0 = 16 cycles
22  */
23 #define EBI_CSR_WAIT_MASK	0xF0
24 /* Whether memory is synchronous or asynchronous */
25 #define EBI_CSR_SYNC_MASK	0xF7
26 #define EBI_CSR_ASYNC		0x00
27 #define EBI_CSR_SYNC		0x08
28 /* Whether memory is write enabled or not */
29 #define EBI_CSR_WREN_MASK	0xFB
30 #define EBI_CSR_WREN_DISABLE	0x00
31 #define EBI_CSR_WREN_ENABLE	0x04
32 /* Memory bit width for each chip select */
33 #define EBI_CSR_MEMSIZE_MASK	0xFC
34 #define EBI_CSR_MEMSIZE_8BIT	0x00
35 #define EBI_CSR_MEMSIZE_16BIT	0x01
36 #define EBI_CSR_MEMSIZE_32BIT	0x02
37 
38 /*
39  * The lock register need to be written with 0xa05f before anything in the
40  * EBI can be changed.
41  */
42 #define EBI_LOCK_REG		0x20
43 #define EBI_UNLOCK_MAGIC	0xA05F
44 
45 #endif
46