From 1d5ff7e27d2ca30cd3f61afd353b03dd67330818 Mon Sep 17 00:00:00 2001 From: Robin Getz Date: Thu, 9 Oct 2008 17:06:32 +0800 Subject: 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 Signed-off-by: Bryan Wu --- arch/blackfin/kernel/traps.c | 15 +++++++++++++-- arch/blackfin/mach-common/interrupt.S | 9 +++++++++ 2 files changed, 22 insertions(+), 2 deletions(-) (limited to 'arch/blackfin') diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c index 1a3c4da..709c247 100644 --- a/arch/blackfin/kernel/traps.c +++ b/arch/blackfin/kernel/traps.c @@ -1025,8 +1025,19 @@ void show_regs(struct pt_regs *fp) printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted()); printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n", (long)fp->seqstat, fp->ipend, fp->syscfg); - printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n", - (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14); + if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) { + printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n", + (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14); +#ifdef EBIU_ERRMST + /* If the error was from the EBIU, print it out */ + if (bfin_read_EBIU_ERRMST() & CORE_ERROR) { + printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n", + bfin_read_EBIU_ERRMST()); + printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n", + bfin_read_EBIU_ERRADD()); + } +#endif + } printk(KERN_NOTICE " EXCAUSE : 0x%lx\n", fp->seqstat & SEQSTAT_EXCAUSE); for (i = 6; i <= 15 ; i++) { diff --git a/arch/blackfin/mach-common/interrupt.S b/arch/blackfin/mach-common/interrupt.S index 647f0f5..4a2ec7a 100644 --- a/arch/blackfin/mach-common/interrupt.S +++ b/arch/blackfin/mach-common/interrupt.S @@ -179,7 +179,16 @@ ENTRY(_evt_ivhw) call _trap_c; SP += 12; +#ifdef EBIU_ERRMST + /* make sure EBIU_ERRMST is clear */ + p0.l = LO(EBIU_ERRMST); + p0.h = HI(EBIU_ERRMST); + r0.l = (CORE_ERROR | CORE_MERROR); + w[p0] = r0.l; +#endif + call _ret_from_exception; + .Lcommon_restore_all_sys: RESTORE_ALL_SYS rti; -- cgit v1.1