1 files changed, 110 insertions, 0 deletions
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h
new file mode 100644
index 0000000000..1daf39aa25
--- /dev/null
+++ b/src/include/pc80/mc146818rtc.h
@@ -0,0 +1,110 @@
+#ifndef PC80_MC146818RTC_H
+#define PC80_MC146818RTC_H
+
+#ifndef RTC_BASE_PORT
+#define RTC_BASE_PORT 0x70
+#endif
+
+#define RTC_PORT(x)	(RTC_BASE_PORT + (x))
+
+/* On PCs, the checksum is built only over bytes 16..45 */
+#define PC_CKS_RANGE_START	16
+#define PC_CKS_RANGE_END	45
+#define PC_CKS_LOC		46
+
+
+/* Linux bios checksum is built only over bytes 49..125 */
+#define LB_CKS_RANGE_START	49
+#define LB_CKS_RANGE_END	125
+#define LB_CKS_LOC		126
+
+
+/* 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_RATE_NONE		0x00
+#  define RTC_RATE_32786HZ	0x01
+#  define RTC_RATE_16384HZ	0x02
+#  define RTC_RATE_8192HZ	0x03
+#  define RTC_RATE_4096HZ	0x04
+#  define RTC_RATE_2048HZ	0x05
+#  define RTC_RATE_1024HZ	0x06
+#  define RTC_RATE_512HZ	0x07
+#  define RTC_RATE_256HZ	0x08
+#  define RTC_RATE_128HZ	0x09
+#  define RTC_RATE_64HZ		0x0a
+#  define RTC_RATE_32HZ		0x0b
+#  define RTC_RATE_16HZ		0x0c
+#  define RTC_RATE_8HZ		0x0d
+#  define RTC_RATE_4HZ		0x0e
+#  define RTC_RATE_2HZ		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 */
+/**********************************************************************/
+
+
+/* On PCs, the checksum is built only over bytes 16..45 */
+#define PC_CKS_RANGE_START	16
+#define PC_CKS_RANGE_END	45
+#define PC_CKS_LOC		46
+
+#define LB_CKS_RANGE_START	49
+#define LB_CKS_RANGE_END	125
+#define LB_CKS_LOC		126
+
+#if !defined(ASSEMBLY)
+void rtc_init(int invalid);
+#if USE_OPTION_TABLE == 1
+int get_option(void *dest, char *name);
+#else
+#define get_option(dest, name) (-2)
+#endif
+#endif
+
+#endif /*  PC80_MC146818RTC_H */