From: Olav Morken <olavmrk@gmail.com>
Date: Fri, 23 Jan 2009 11:56:32 +0000 (+0100)
Subject: AVR32: Must add NOPs after disabling interrupts for AT32UC3A0512ES
X-Git-Tag: v2009.06-rc1~145^2^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b423f94063bf04e92047ff85c7e53441eb3b712b;p=kernel%2Fu-boot.git

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>
---

diff --git a/lib_avr32/interrupts.c b/lib_avr32/interrupts.c
index 28df20d..bbbc490 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);
 }