From b423f94063bf04e92047ff85c7e53441eb3b712b Mon Sep 17 00:00:00 2001
From: Olav Morken <olavmrk@gmail.com>
Date: Fri, 23 Jan 2009 12:56:32 +0100
Subject: [PATCH] AVR32: Must add NOPs after disabling interrupts for
AT32UC3A0512ES
The AT32UC3A0512ES chip has a bug when disabling interrupts. As a
workaround, two NOPs can be inserted.
Signed-off-by: Gunnar Rangoy <gunnar@rangoy.com>
Signed-off-by: Paul Driveklepp <pauldriveklepp@gmail.com>
Signed-off-by: Olav Morken <olavmrk@gmail.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
---
lib_avr32/interrupts.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/lib_avr32/interrupts.c b/lib_avr32/interrupts.c
index 28df20db010..bbbc490db23 100644
--- a/lib_avr32/interrupts.c
+++ b/lib_avr32/interrupts.c
@@ -35,5 +35,12 @@ int disable_interrupts(void)
sr = sysreg_read(SR);
asm volatile("ssrf %0" : : "n"(SYSREG_GM_OFFSET));
+#ifdef CONFIG_AT32UC3A0xxx
+ /* Two NOPs are required after masking interrupts on the
+ * AT32UC3A0512ES. See errata 41.4.5.5. */
+ asm("nop");
+ asm("nop");
+#endif
+
return !SYSREG_BFEXT(GM, sr);
}
--
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