| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Machine dependent access functions for RTC registers. |
| 4 | */ |
| 5 | #ifndef _ASM_MC146818RTC_H |
| 6 | #define _ASM_MC146818RTC_H |
| 7 | |
| Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 8 | #include <linux/io.h> |
| Rob Herring | bd8abc9 | 2012-01-03 14:55:24 -0600 | [diff] [blame] | 9 | #include <linux/kernel.h> |
| 10 | |
| 11 | #define RTC_IRQ BUILD_BUG_ON(1) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |