arm: at91: Add a header file for the real-time clock

Add register definitions for the AT91 RTC so that this can potentially be
used in U-Boot.

Signed-off-by: Andre Renaud <andre@designa-electronics.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>

arch/arm/mach-at91/include/mach/at91_rtc.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2005 Ivan Kokshaysky
+ * Copyright (C) SAN People
+ *
+ * Real Time Clock (RTC) - System peripheral registers.
+ * Based on AT91RM9200 datasheet revision E.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef AT91_RTC_H
+#define AT91_RTC_H
+
+/* Control Register */
+#define AT91_RTC_CR		(ATMEL_BASE_RTC + 0x00)
+#define AT91_RTC_UPDTIM		(1 <<  0)	/* Update Request Time */
+#define AT91_RTC_UPDCAL		(1 <<  1)	/* Update Request Calendar */
+#define AT91_RTC_TIMEVSEL	(3 <<  8)	/* Time Event Selection */
+#define AT91_RTC_TIMEVSEL_MINUTE (0 << 8)
+#define AT91_RTC_TIMEVSEL_HOUR	(1 << 8)
+#define AT91_RTC_TIMEVSEL_DAY24	(2 << 8)
+#define AT91_RTC_TIMEVSEL_DAY12	(3 << 8)
+#define AT91_RTC_CALEVSEL	(3 << 16)	/* Calendar Event Selection */
+#define AT91_RTC_CALEVSEL_WEEK	(0 << 16)
+#define AT91_RTC_CALEVSEL_MONTH	(1 << 16)
+#define AT91_RTC_CALEVSEL_YEAR	(2 << 16)
+
+#define AT91_RTC_MR		(ATMEL_BASE_RTC + 0x04)	/* Mode Register */
+#define AT91_RTC_HRMOD		(1 <<  0)		/* 12/24 Hour Mode */
+
+#define AT91_RTC_TIMR		(ATMEL_BASE_RTC + 0x08)	/* Time Register */
+#define AT91_RTC_SEC		(0x7f <<  0)		/* Current Second */
+#define AT91_RTC_MIN		(0x7f <<  8)		/* Current Minute */
+#define AT91_RTC_HOUR		(0x3f << 16)		/* Current Hour */
+#define AT91_RTC_AMPM		(1    << 22)		/* AM/PM */
+
+#define AT91_RTC_CALR		(ATMEL_BASE_RTC + 0x0c)	/* Calendar Register */
+#define AT91_RTC_CENT		(0x7f <<  0)		/* Current Century */
+#define AT91_RTC_YEAR		(0xff <<  8)		/* Current Year */
+#define AT91_RTC_MONTH		(0x1f << 16)		/* Current Month */
+#define AT91_RTC_DAY		(7    << 21)		/* Current Day */
+#define AT91_RTC_DATE		(0x3f << 24)		/* Current Date */
+
+#define AT91_RTC_TIMALR		(ATMEL_BASE_RTC + 0x10)	/* Time Alarm */
+#define AT91_RTC_SECEN		(1 <<  7)		/* Second Alarm Enab */
+#define AT91_RTC_MINEN		(1 << 15)		/* Minute Alarm Enab */
+#define AT91_RTC_HOUREN		(1 << 23)		/* Hour Alarm Enable */
+
+#define AT91_RTC_CALALR		(ATMEL_BASE_RTC + 0x14)	/* Calendar Alarm */
+#define AT91_RTC_MTHEN		(1 << 23)		/* Month Alarm Enable */
+#define AT91_RTC_DATEEN		(1 << 31)		/* Date Alarm Enable */
+
+#define AT91_RTC_SR		(ATMEL_BASE_RTC + 0x18)	/* Status Register */
+#define AT91_RTC_ACKUPD		(1 <<  0)		/* Ack for Update */
+#define AT91_RTC_ALARM		(1 <<  1)		/* Alarm Flag */
+#define AT91_RTC_SECEV		(1 <<  2)		/* Second Event */
+#define AT91_RTC_TIMEV		(1 <<  3)		/* Time Event */
+#define AT91_RTC_CALEV		(1 <<  4)		/* Calendar Event */
+
+#define AT91_RTC_SCCR		(ATMEL_BASE_RTC + 0x1c)	/* Status Clear Cmd */
+#define AT91_RTC_IER		(ATMEL_BASE_RTC + 0x20)	/* Interrupt Enable */
+#define AT91_RTC_IDR		(ATMEL_BASE_RTC + 0x24)	/* Interrupt Disable */
+#define AT91_RTC_IMR		(ATMEL_BASE_RTC + 0x28)	/* Interrupt Mask */
+
+#define AT91_RTC_VER		(ATMEL_BASE_RTC + 0x2c)	/* Valid Entry */
+#define AT91_RTC_NVTIM		(1 <<  0)		/* Non-valid Time */
+#define AT91_RTC_NVCAL		(1 <<  1)		/* Non-valid Calendar */
+#define AT91_RTC_NVTIMALR	(1 <<  2)		/* .. Time Alarm */
+#define AT91_RTC_NVCALALR	(1 <<  3)		/* .. Calendar Alarm */
+
+#endif