Blackfin arch: Fix bug - HW Errors never recover on BF548
The kernel does not properly clear the EBIU Error Master (EBIU_ERRMST) Register on BF548, which causes the kernel to panic. We need to make sure that we clear the EBIU_ERRMST (necessary on BF54x) Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
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@ -1025,8 +1025,19 @@ void show_regs(struct pt_regs *fp)
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printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
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printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
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(long)fp->seqstat, fp->ipend, fp->syscfg);
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printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
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(fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
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if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
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printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
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(fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
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#ifdef EBIU_ERRMST
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/* If the error was from the EBIU, print it out */
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if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
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printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n",
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bfin_read_EBIU_ERRMST());
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printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n",
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bfin_read_EBIU_ERRADD());
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}
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#endif
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}
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printk(KERN_NOTICE " EXCAUSE : 0x%lx\n",
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fp->seqstat & SEQSTAT_EXCAUSE);
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for (i = 6; i <= 15 ; i++) {
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@ -179,7 +179,16 @@ ENTRY(_evt_ivhw)
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call _trap_c;
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SP += 12;
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#ifdef EBIU_ERRMST
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/* make sure EBIU_ERRMST is clear */
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p0.l = LO(EBIU_ERRMST);
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p0.h = HI(EBIU_ERRMST);
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r0.l = (CORE_ERROR | CORE_MERROR);
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w[p0] = r0.l;
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#endif
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call _ret_from_exception;
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.Lcommon_restore_all_sys:
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RESTORE_ALL_SYS
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rti;
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