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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /arch/arm/mach-at91/at91sam9_alt_reset.S
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'arch/arm/mach-at91/at91sam9_alt_reset.S')
-rw-r--r--arch/arm/mach-at91/at91sam9_alt_reset.S40
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diff --git a/arch/arm/mach-at91/at91sam9_alt_reset.S b/arch/arm/mach-at91/at91sam9_alt_reset.S
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+/*
+ * reset AT91SAM9G20 as per errata
+ *
+ * (C) BitBox Ltd 2010
+ *
+ * unless the SDRAM is cleanly shutdown before we hit the
+ * reset register it can be left driving the data bus and
+ * killing the chance of a subsequent boot from NAND
+ *
+ * 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.
+ */
+
+#include <linux/linkage.h>
+#include <mach/hardware.h>
+#include <mach/at91_ramc.h>
+#include <mach/at91_rstc.h>
+
+ .arm
+
+ .globl at91sam9_alt_restart
+
+at91sam9_alt_restart: ldr r0, =at91_ramc_base @ preload constants
+ ldr r0, [r0]
+ ldr r4, =at91_rstc_base
+ ldr r1, [r4]
+
+ mov r2, #1
+ mov r3, #AT91_SDRAMC_LPCB_POWER_DOWN
+ ldr r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST
+
+ .balign 32 @ align to cache line
+
+ str r2, [r0, #AT91_SDRAMC_TR] @ disable SDRAM access
+ str r3, [r0, #AT91_SDRAMC_LPR] @ power down SDRAM
+ str r4, [r1, #AT91_RSTC_CR] @ reset processor
+
+ b .