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 @@
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);
}