AT91: add two new header files for RTT and GPBR

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+/*
+ * Copyright (C) 2010
+ * Reinhard Meyer, reinhard.meyer at emk-elektronik.de
+ *
+ * General Purpose Backup Registers
+ * Based on AT91SAM9XE datasheet
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef AT91_GPBR_H
+#define AT91_GPBR_H
+
+/*
+ * The Atmel AT91SAM9 series has a small resource of 4 nonvolatile
+ * 32 Bit registers (buffered by the Vbu power).
+ *
+ * Please consider carefully before using this resource for tasks
+ * that do not really need nonvolatile registers. Maybe you can
+ * store information in EEPROM or FLASH instead.
+ *
+ * However, if you use a GPBR please document its use here and
+ * reference the define in your code!
+ *
+ * known typical uses of the GPBRs:
+ * GPBR[0]: offset for RTT timekeeping (u-boot, kernel)
+ * GPBR[1]: unused
+ * GPBR[2]: unused
+ * GPBR[3]: bootcount (u-boot)
+ */
+#define AT91_GPBR_INDEX_TIMEOFF 0
+#define AT91_GPBR_INDEX_BOOTCOUNT 3
+
+#ifndef __ASSEMBLY__
+
+typedef struct at91_gpbr {
+	u32 reg[4];
+} at91_gpbr_t;
+
+#endif /* __ASSEMBLY__ */
+
+#endif

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+/*
+ * Copyright (C) 2010
+ * Reinhard Meyer, reinhard.meyer at emk-elektronik.de
+ *
+ * Real-time Timer
+ * Based on AT91SAM9XE datasheet
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef AT91_RTT_H
+#define AT91_RTT_H
+
+#ifndef __ASSEMBLY__
+
+typedef struct at91_rtt {
+	u32	mr;	/* Mode Register   RW 0x00008000 */
+	u32	ar;	/* Alarm Register  RW 0xFFFFFFFF */
+	u32	vr;	/* Value Register  RO 0x00000000 */
+	u32	sr;	/* Status Register RO 0x00000000 */
+} at91_rtt_t;
+
+#endif /* __ASSEMBLY__ */
+
+#define AT91_RTT_MR_RTPRES	0x0000ffff
+#define AT91_RTT_MR_ALMIEN	0x00010000
+#define AT91_RTT_RTTINCIEN	0x00020000
+#define AT91_RTT_RTTRST	0x00040000
+
+#define AT91_RTT_SR_ALMS	0x00000001
+#define AT91_RTT_SR_RTTINC	0x00000002
+
+#endif