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>
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@ -36,6 +36,21 @@
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# define LOAD_IPIPE_IPEND
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#endif
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/*
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* Workaround for anomalies 05000283 and 05000315
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*/
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#if ANOMALY_05000283 || ANOMALY_05000315
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# define ANOMALY_283_315_WORKAROUND(preg, dreg) \
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cc = dreg == dreg; \
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preg.h = HI(CHIPID); \
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preg.l = LO(CHIPID); \
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if cc jump 1f; \
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dreg.l = W[preg]; \
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1:
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#else
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# define ANOMALY_283_315_WORKAROUND(preg, dreg)
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#endif /* ANOMALY_05000283 || ANOMALY_05000315 */
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#ifndef CONFIG_EXACT_HWERR
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/* As a debugging aid - we save IPEND when DEBUG_KERNEL is on,
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* otherwise it is a waste of cycles.
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@ -88,17 +103,22 @@
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* As you can see by the code - we actually need to do two SSYNCS - one to
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* make sure the read/writes complete, and another to make sure the hardware
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* error is recognized by the core.
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*
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* The extra nop before the SSYNC is to make sure we work around 05000244,
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* since the 283/315 workaround includes a branch to the end
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*/
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#define INTERRUPT_ENTRY(N) \
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SSYNC; \
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SSYNC; \
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[--sp] = SYSCFG; \
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[--sp] = P0; /*orig_p0*/ \
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[--sp] = R0; /*orig_r0*/ \
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[--sp] = (R7:0,P5:0); \
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R1 = ASTAT; \
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ANOMALY_283_315_WORKAROUND(p0, r0) \
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P0.L = LO(ILAT); \
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P0.H = HI(ILAT); \
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NOP; \
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SSYNC; \
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SSYNC; \
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R0 = [P0]; \
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CC = BITTST(R0, EVT_IVHW_P); \
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IF CC JUMP 1f; \
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@ -118,15 +138,17 @@
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RTI;
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#define TIMER_INTERRUPT_ENTRY(N) \
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SSYNC; \
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SSYNC; \
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[--sp] = SYSCFG; \
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[--sp] = P0; /*orig_p0*/ \
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[--sp] = R0; /*orig_r0*/ \
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[--sp] = (R7:0,P5:0); \
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R1 = ASTAT; \
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ANOMALY_283_315_WORKAROUND(p0, r0) \
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P0.L = LO(ILAT); \
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P0.H = HI(ILAT); \
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NOP; \
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SSYNC; \
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SSYNC; \
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R0 = [P0]; \
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CC = BITTST(R0, EVT_IVHW_P); \
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IF CC JUMP 1f; \
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@ -513,14 +513,7 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
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ssync;
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#endif
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#if ANOMALY_05000283 || ANOMALY_05000315
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cc = r7 == r7;
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p5.h = HI(CHIPID);
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p5.l = LO(CHIPID);
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if cc jump 1f;
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r7.l = W[p5];
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1:
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#endif
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ANOMALY_283_315_WORKAROUND(p5, r7)
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#ifdef CONFIG_DEBUG_DOUBLEFAULT
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/*
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@ -1134,14 +1127,7 @@ ENTRY(_early_trap)
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SAVE_ALL_SYS
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trace_buffer_stop(p0,r0);
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#if ANOMALY_05000283 || ANOMALY_05000315
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cc = r5 == r5;
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p4.h = HI(CHIPID);
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p4.l = LO(CHIPID);
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if cc jump 1f;
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r5.l = W[p4];
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1:
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#endif
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ANOMALY_283_315_WORKAROUND(p4, r5)
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/* Turn caches off, to ensure we don't get double exceptions */
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@ -119,14 +119,8 @@ __common_int_entry:
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fp = 0;
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#endif
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#if ANOMALY_05000283 || ANOMALY_05000315
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cc = r7 == r7;
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p5.h = HI(CHIPID);
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p5.l = LO(CHIPID);
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if cc jump 1f;
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r7.l = W[p5];
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1:
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#endif
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ANOMALY_283_315_WORKAROUND(p5, r7)
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r1 = sp;
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SP += -12;
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#ifdef CONFIG_IPIPE
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@ -158,14 +152,7 @@ ENTRY(_evt_ivhw)
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fp = 0;
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#endif
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#if ANOMALY_05000283 || ANOMALY_05000315
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cc = r7 == r7;
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p5.h = HI(CHIPID);
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p5.l = LO(CHIPID);
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if cc jump 1f;
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r7.l = W[p5];
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1:
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#endif
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ANOMALY_283_315_WORKAROUND(p5, r7)
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/* Handle all stacked hardware errors
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* To make sure we don't hang forever, only do it 10 times
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