Blackfin: workaround anomaly 05000310

[mv-sheeva.git] / arch / blackfin / kernel / traps.c

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 427294c47f1b19ff1c1ef308b5184a62d973082b..e4fd516ce4820d2b53a1ddc64f641a7fb1884652 100644 (file)
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -524,6 +524,36 @@ asmlinkage notrace void trap_c(struct pt_regs *fp)
                        break;
                /* External Memory Addressing Error */
                case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
+                       if (ANOMALY_05000310) {
+                               static unsigned long anomaly_rets;
+
+                               if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
+                                   (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
+                                       /*
+                                        * A false hardware error will happen while fetching at
+                                        * the L1 instruction SRAM boundary.  Ignore it.
+                                        */
+                                       anomaly_rets = fp->rets;
+                                       goto traps_done;
+                               } else if (fp->rets == anomaly_rets) {
+                                       /*
+                                        * While boundary code returns to a function, at the ret
+                                        * point, a new false hardware error might occur too based
+                                        * on tests.  Ignore it too.
+                                        */
+                                       goto traps_done;
+                               } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
+                                          (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
+                                       /*
+                                        * If boundary code calls a function, at the entry point,
+                                        * a new false hardware error maybe happen based on tests.
+                                        * Ignore it too.
+                                        */
+                                       goto traps_done;
+                               } else
+                                       anomaly_rets = 0;
+                       }
+
                        info.si_code = BUS_ADRERR;
                        sig = SIGBUS;
                        strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);