1 /* 2 * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #ifndef __EARLY_CMOS_H 8 #define __EARLY_CMOS_H 9 10 /* CMOS actually resides in the RTC SRAM */ 11 #define CMOS_IO_PORT 0x70 12 13 /** 14 * cmos_read8() - Get 8-bit data stored at the given address 15 * 16 * This reads from CMOS for the 8-bit data stored at the given address. 17 * 18 * @addr: RTC SRAM address 19 * @return: 8-bit data stored at the given address 20 */ 21 u8 cmos_read8(u8 addr); 22 23 /** 24 * cmos_read16() - Get 16-bit data stored at the given address 25 * 26 * This reads from CMOS for the 16-bit data stored at the given address. 27 * 28 * @addr: RTC SRAM address 29 * @return: 16-bit data stored at the given address 30 */ 31 u16 cmos_read16(u8 addr); 32 33 /** 34 * cmos_read32() - Get 32-bit data stored at the given address 35 * 36 * This reads from CMOS for the 32-bit data stored at the given address. 37 * 38 * @addr: RTC SRAM address 39 * @return: 32-bit data stored at the given address 40 */ 41 u32 cmos_read32(u8 addr); 42 43 #endif /* __EARLY_CMOS_H */ 44