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authorRobin Getz <robin.getz@analog.com>2009-08-26 15:54:10 +0000
committerMike Frysinger <vapier@gentoo.org>2009-09-16 22:10:34 -0400
commitdedfd5d7f21b08d50ba8c0220778e119952e2f77 (patch)
tree2d6bf1d13dfe16679c126beed7f35a2f840d22bd /arch/blackfin/include/asm
parent05d17dfaab6671def3fcdcd95c39fd49924dbb3b (diff)
Blackfin: workaround anomaly 05000283
Make sure our interrupt entry code with exact hardware errors handles anomaly 05000283 (infinite stall in system MMR kill) so we don't stall while under load. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/include/asm')
-rw-r--r--arch/blackfin/include/asm/entry.h30
1 files changed, 26 insertions, 4 deletions
diff --git a/arch/blackfin/include/asm/entry.h b/arch/blackfin/include/asm/entry.h
index ec58efc130e..55b808fced7 100644
--- a/arch/blackfin/include/asm/entry.h
+++ b/arch/blackfin/include/asm/entry.h
@@ -36,6 +36,21 @@
# define LOAD_IPIPE_IPEND
#endif
+/*
+ * Workaround for anomalies 05000283 and 05000315
+ */
+#if ANOMALY_05000283 || ANOMALY_05000315
+# define ANOMALY_283_315_WORKAROUND(preg, dreg) \
+ cc = dreg == dreg; \
+ preg.h = HI(CHIPID); \
+ preg.l = LO(CHIPID); \
+ if cc jump 1f; \
+ dreg.l = W[preg]; \
+1:
+#else
+# define ANOMALY_283_315_WORKAROUND(preg, dreg)
+#endif /* ANOMALY_05000283 || ANOMALY_05000315 */
+
#ifndef CONFIG_EXACT_HWERR
/* As a debugging aid - we save IPEND when DEBUG_KERNEL is on,
* otherwise it is a waste of cycles.
@@ -88,17 +103,22 @@
* As you can see by the code - we actually need to do two SSYNCS - one to
* make sure the read/writes complete, and another to make sure the hardware
* error is recognized by the core.
+ *
+ * The extra nop before the SSYNC is to make sure we work around 05000244,
+ * since the 283/315 workaround includes a branch to the end
*/
#define INTERRUPT_ENTRY(N) \
- SSYNC; \
- SSYNC; \
[--sp] = SYSCFG; \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
R1 = ASTAT; \
+ ANOMALY_283_315_WORKAROUND(p0, r0) \
P0.L = LO(ILAT); \
P0.H = HI(ILAT); \
+ NOP; \
+ SSYNC; \
+ SSYNC; \
R0 = [P0]; \
CC = BITTST(R0, EVT_IVHW_P); \
IF CC JUMP 1f; \
@@ -118,15 +138,17 @@
RTI;
#define TIMER_INTERRUPT_ENTRY(N) \
- SSYNC; \
- SSYNC; \
[--sp] = SYSCFG; \
[--sp] = P0; /*orig_p0*/ \
[--sp] = R0; /*orig_r0*/ \
[--sp] = (R7:0,P5:0); \
R1 = ASTAT; \
+ ANOMALY_283_315_WORKAROUND(p0, r0) \
P0.L = LO(ILAT); \
P0.H = HI(ILAT); \
+ NOP; \
+ SSYNC; \
+ SSYNC; \
R0 = [P0]; \
CC = BITTST(R0, EVT_IVHW_P); \
IF CC JUMP 1f; \