init android origin source code

1 files changed, 38 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/arch/arm/mach-at91/at91sam9g45_reset.S b/ANDROID_3.4.5/arch/arm/mach-at91/at91sam9g45_reset.S
new file mode 100644
index 00000000..9d457182
--- /dev/null
+++ b/ANDROID_3.4.5/arch/arm/mach-at91/at91sam9g45_reset.S
@@ -0,0 +1,38 @@
+/*
+ * reset AT91SAM9G45 as per errata
+ *
+ * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcosoft.com>
+ *
+ * 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
+ *
+ * GPLv2 Only
+ */
+
+#include <linux/linkage.h>
+#include <mach/hardware.h>
+#include <mach/at91_ramc.h>
+#include <mach/at91_rstc.h>
+
+			.arm
+
+			.globl	at91sam9g45_restart
+
+at91sam9g45_restart:
+			ldr	r5, =at91_ramc_base		@ preload constants
+			ldr	r0, [r5]
+			ldr	r4, =at91_rstc_base
+			ldr	r1, [r4]
+
+			mov	r2, #1
+			mov	r3, #AT91_DDRSDRC_LPCB_POWER_DOWN
+			ldr	r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST
+
+			.balign	32				@ align to cache line
+
+			str	r2, [r0, #AT91_DDRSDRC_RTR]	@ disable DDR0 access
+			str	r3, [r0, #AT91_DDRSDRC_LPR]	@ power down DDR0
+			str	r4, [r1, #AT91_RSTC_CR]		@ reset processor
+
+			b	.