| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Machine dependent access functions for RTC registers. |
| 3 | */ |
| 4 | #ifndef _ASM_MC146818RTC_H |
| 5 | #define _ASM_MC146818RTC_H |
| 6 | |
| Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 7 | #include <linux/io.h> |
| Rob Herring | bd8abc9 | 2012-01-03 14:55:24 -0600 | [diff] [blame] | 8 | #include <linux/kernel.h> |
| 9 | |
| 10 | #define RTC_IRQ BUILD_BUG_ON(1) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
| 12 | #ifndef RTC_PORT |
| 13 | #define RTC_PORT(x) (0x70 + (x)) |
| 14 | #define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */ |
| 15 | #endif |
| 16 | |
| 17 | /* |
| 18 | * The yet supported machines all access the RTC index register via |
| 19 | * an ISA port access but the way to access the date register differs ... |
| 20 | */ |
| 21 | #define CMOS_READ(addr) ({ \ |
| 22 | outb_p((addr),RTC_PORT(0)); \ |
| 23 | inb_p(RTC_PORT(1)); \ |
| 24 | }) |
| 25 | #define CMOS_WRITE(val, addr) ({ \ |
| 26 | outb_p((addr),RTC_PORT(0)); \ |
| 27 | outb_p((val),RTC_PORT(1)); \ |
| 28 | }) |
| 29 | |
| 30 | #endif /* _ASM_MC146818RTC_H */ |