diff options
Diffstat (limited to 'roms/u-boot/board/armltd/integrator/arm-ebi.h')
| -rw-r--r-- | roms/u-boot/board/armltd/integrator/arm-ebi.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/roms/u-boot/board/armltd/integrator/arm-ebi.h b/roms/u-boot/board/armltd/integrator/arm-ebi.h new file mode 100644 index 000000000..6b1a96d8a --- /dev/null +++ b/roms/u-boot/board/armltd/integrator/arm-ebi.h @@ -0,0 +1,45 @@ +/* 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 |