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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * Machine dependent access functions for RTC registers. |
| 4 | */ |
| 5 | #ifndef _ASM_MC146818RTC_H |
| 6 | #define _ASM_MC146818RTC_H |
| 7 | |
| 8 | #include <linux/io.h> |
| 9 | #include <linux/kernel.h> |
| 10 | |
| 11 | #define RTC_IRQ BUILD_BUG_ON(1) |
| 12 | |
| 13 | #ifndef RTC_PORT |
| 14 | #define RTC_PORT(x) (0x70 + (x)) |
| 15 | #define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */ |
| 16 | #endif |
| 17 | |
| 18 | /* |
| 19 | * The yet supported machines all access the RTC index register via |
| 20 | * an ISA port access but the way to access the date register differs ... |
| 21 | */ |
| 22 | #define CMOS_READ(addr) ({ \ |
| 23 | outb_p((addr),RTC_PORT(0)); \ |
| 24 | inb_p(RTC_PORT(1)); \ |
| 25 | }) |
| 26 | #define CMOS_WRITE(val, addr) ({ \ |
| 27 | outb_p((addr),RTC_PORT(0)); \ |
| 28 | outb_p((val),RTC_PORT(1)); \ |
| 29 | }) |
| 30 | |
| 31 | #endif /* _ASM_MC146818RTC_H */ |
| 32 |
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