1 files changed, 92 insertions, 0 deletions

diff --git a/include/linux/mc146818rtc.h b/include/linux/mc146818rtc.h
new file mode 100644
index 000000000000..bbc93ae217e1
--- /dev/null
+++ b/include/linux/mc146818rtc.h
@@ -0,0 +1,92 @@
+/* mc146818rtc.h - register definitions for the Real-Time-Clock / CMOS RAM
+ * Copyright Torsten Duwe <duwe@informatik.uni-erlangen.de> 1993
+ * derived from Data Sheet, Copyright Motorola 1984 (!).
+ * It was written to be part of the Linux operating system.
+ */
+/* permission is hereby granted to copy, modify and redistribute this code
+ * in terms of the GNU Library General Public License, Version 2 or later,
+ * at your option.
+ */
+
+#ifndef _MC146818RTC_H
+#define _MC146818RTC_H
+
+#include <asm/io.h>
+#include <linux/rtc.h>                  /* get the user-level API */
+#include <asm/mc146818rtc.h>            /* register access macros */
+
+#ifdef __KERNEL__
+#include <linux/spinlock.h>             /* spinlock_t */
+extern spinlock_t rtc_lock;             /* serialize CMOS RAM access */
+#endif
+
+/**********************************************************************
+ * register summary
+ **********************************************************************/
+#define RTC_SECONDS             0
+#define RTC_SECONDS_ALARM       1
+#define RTC_MINUTES             2
+#define RTC_MINUTES_ALARM       3
+#define RTC_HOURS               4
+#define RTC_HOURS_ALARM         5
+/* RTC_*_alarm is always true if 2 MSBs are set */
+# define RTC_ALARM_DONT_CARE    0xC0
+
+#define RTC_DAY_OF_WEEK         6
+#define RTC_DAY_OF_MONTH        7
+#define RTC_MONTH               8
+#define RTC_YEAR                9
+
+/* control registers - Moto names
+ */
+#define RTC_REG_A               10
+#define RTC_REG_B               11
+#define RTC_REG_C               12
+#define RTC_REG_D               13
+
+/**********************************************************************
+ * register details
+ **********************************************************************/
+#define RTC_FREQ_SELECT RTC_REG_A
+
+/* update-in-progress  - set to "1" 244 microsecs before RTC goes off the bus,
+ * reset after update (may take 1.984ms @ 32768Hz RefClock) is complete,
+ * totalling to a max high interval of 2.228 ms.
+ */
+# define RTC_UIP                0x80
+# define RTC_DIV_CTL            0x70
+   /* divider control: refclock values 4.194 / 1.049 MHz / 32.768 kHz */
+#  define RTC_REF_CLCK_4MHZ     0x00
+#  define RTC_REF_CLCK_1MHZ     0x10
+#  define RTC_REF_CLCK_32KHZ    0x20
+   /* 2 values for divider stage reset, others for "testing purposes only" */
+#  define RTC_DIV_RESET1        0x60
+#  define RTC_DIV_RESET2        0x70
+  /* Periodic intr. / Square wave rate select. 0=none, 1=32.8kHz,... 15=2Hz */
+# define RTC_RATE_SELECT        0x0F
+
+/**********************************************************************/
+#define RTC_CONTROL     RTC_REG_B
+# define RTC_SET 0x80           /* disable updates for clock setting */
+# define RTC_PIE 0x40           /* periodic interrupt enable */
+# define RTC_AIE 0x20           /* alarm interrupt enable */
+# define RTC_UIE 0x10           /* update-finished interrupt enable */
+# define RTC_SQWE 0x08          /* enable square-wave output */
+# define RTC_DM_BINARY 0x04     /* all time/date values are BCD if clear */
+# define RTC_24H 0x02           /* 24 hour mode - else hours bit 7 means pm */
+# define RTC_DST_EN 0x01        /* auto switch DST - works f. USA only */
+
+/**********************************************************************/
+#define RTC_INTR_FLAGS  RTC_REG_C
+/* caution - cleared by read */
+# define RTC_IRQF 0x80          /* any of the following 3 is active */
+# define RTC_PF 0x40
+# define RTC_AF 0x20
+# define RTC_UF 0x10
+
+/**********************************************************************/
+#define RTC_VALID       RTC_REG_D
+# define RTC_VRT 0x80           /* valid RAM and time */
+/**********************************************************************/
+
+#endif /* _MC146818RTC_H */