1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com> 4 */ 5 6 #ifndef __EARLY_CMOS_H 7 #define __EARLY_CMOS_H 8 9 /* CMOS actually resides in the RTC SRAM */ 10 #define CMOS_IO_PORT 0x70 11 12 /** 13 * cmos_read8() - Get 8-bit data stored at the given address 14 * 15 * This reads from CMOS for the 8-bit data stored at the given address. 16 * 17 * @addr: RTC SRAM address 18 * @return: 8-bit data stored at the given address 19 */ 20 u8 cmos_read8(u8 addr); 21 22 /** 23 * cmos_read16() - Get 16-bit data stored at the given address 24 * 25 * This reads from CMOS for the 16-bit data stored at the given address. 26 * 27 * @addr: RTC SRAM address 28 * @return: 16-bit data stored at the given address 29 */ 30 u16 cmos_read16(u8 addr); 31 32 /** 33 * cmos_read32() - Get 32-bit data stored at the given address 34 * 35 * This reads from CMOS for the 32-bit data stored at the given address. 36 * 37 * @addr: RTC SRAM address 38 * @return: 32-bit data stored at the given address 39 */ 40 u32 cmos_read32(u8 addr); 41 42 #endif /* __EARLY_CMOS_H */ 43