| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Machine dependent access functions for RTC registers. |
| */ |
| #ifndef _ASM_MC146818RTC_H |
| #define _ASM_MC146818RTC_H |
| |
| #include <linux/io.h> |
| #include <linux/kernel.h> |
| |
| #define RTC_IRQ BUILD_BUG_ON(1) |
| |
| #ifndef RTC_PORT |
| #define RTC_PORT(x) (0x70 + (x)) |
| #define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */ |
| #endif |
| |
| /* |
| * The yet supported machines all access the RTC index register via |
| * an ISA port access but the way to access the date register differs ... |
| */ |
| #define CMOS_READ(addr) ({ \ |
| outb_p((addr),RTC_PORT(0)); \ |
| inb_p(RTC_PORT(1)); \ |
| }) |
| #define CMOS_WRITE(val, addr) ({ \ |
| outb_p((addr),RTC_PORT(0)); \ |
| outb_p((val),RTC_PORT(1)); \ |
| }) |
| |
| #endif /* _ASM_MC146818RTC_H */ |
