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authorReinhard Meyer <u-boot@emk-elektronik.de>2010-07-27 16:22:09 +0200
committerReinhard Meyer <u-boot@emk-elektronik.de>2010-09-03 11:20:02 +0200
commitc7260d153994d65416b9b275838f101738e60564 (patch)
tree9fb9bbb1315c02b83e60d2239216154abd505724 /arch
parent1592ef8596fffd937a30462eb15f1d64e237ae49 (diff)
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AT91: add RTT and GPBR based RTC
Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/arch-at91/at91_gpbr.h45
-rw-r--r--arch/arm/include/asm/arch-at91/at91_rtt.h36
2 files changed, 81 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-at91/at91_gpbr.h b/arch/arm/include/asm/arch-at91/at91_gpbr.h
new file mode 100644
index 0000000..cf1d790
--- /dev/null
+++ b/arch/arm/include/asm/arch-at91/at91_gpbr.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2010
+ * Reinhard Meyer, reinhard.meyer@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
diff --git a/arch/arm/include/asm/arch-at91/at91_rtt.h b/arch/arm/include/asm/arch-at91/at91_rtt.h
new file mode 100644
index 0000000..e0253ef
--- /dev/null
+++ b/arch/arm/include/asm/arch-at91/at91_rtt.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2010
+ * Reinhard Meyer, reinhard.meyer@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