| Bin Meng | ba65808 | 2017-04-21 07:24:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0+ |
| 5 | */ |
| 6 | |
| 7 | #ifndef __CMOS_LAYOUT_H |
| 8 | #define __CMOS_LAYOUT_H |
| 9 | |
| 10 | /* |
| 11 | * The RTC internal registers and RAM is organized as two banks of 128 bytes |
| 12 | * each, called the standard and extended banks. The first 14 bytes of the |
| 13 | * standard bank contain the RTC time and date information along with four |
| 14 | * registers, A - D, that are used for configuration of the RTC. The extended |
| 15 | * bank contains a full 128 bytes of battery backed SRAM. |
| 16 | * |
| 17 | * For simplicity in U-Boot we only support CMOS in the standard bank, and |
| 18 | * its base address starts from offset 0x10, which leaves us 112 bytes space. |
| 19 | */ |
| 20 | #define CMOS_BASE 0x10 |
| 21 | |
| 22 | /* |
| 23 | * The file records all offsets off CMOS_BASE that is currently used by |
| 24 | * U-Boot for various reasons. It is put in such a unified place in order |
| 25 | * to be consistent across platforms. |
| 26 | */ |
| 27 | |
| 28 | /* stack address for S3 boot in a FSP configuration, 4 bytes */ |
| 29 | #define CMOS_FSP_STACK_ADDR CMOS_BASE |
| 30 | |
| 31 | #endif /* __CMOS_LAYOUT_H */ |