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135 lines
3.7 KiB
135 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Bus error event handling code for 5000-series systems equipped |
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* with parity error detection logic, i.e. DECstation/DECsystem |
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* 5000/120, /125, /133 (KN02-BA), 5000/150 (KN04-BA) and Personal |
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* DECstation/DECsystem 5000/20, /25, /33 (KN02-CA), 5000/50 |
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* (KN04-CA) systems. |
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* |
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* Copyright (c) 2005 Maciej W. Rozycki |
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*/ |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <asm/addrspace.h> |
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#include <asm/cpu-type.h> |
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#include <asm/irq_regs.h> |
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#include <asm/ptrace.h> |
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#include <asm/traps.h> |
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#include <asm/dec/kn02ca.h> |
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#include <asm/dec/kn02xa.h> |
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#include <asm/dec/kn05.h> |
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static inline void dec_kn02xa_be_ack(void) |
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{ |
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volatile u32 *mer = (void *)CKSEG1ADDR(KN02XA_MER); |
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volatile u32 *mem_intr = (void *)CKSEG1ADDR(KN02XA_MEM_INTR); |
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*mer = KN02CA_MER_INTR; /* Clear errors; keep the ARC IRQ. */ |
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*mem_intr = 0; /* Any write clears the bus IRQ. */ |
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iob(); |
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} |
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static int dec_kn02xa_be_backend(struct pt_regs *regs, int is_fixup, |
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int invoker) |
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{ |
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volatile u32 *kn02xa_mer = (void *)CKSEG1ADDR(KN02XA_MER); |
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volatile u32 *kn02xa_ear = (void *)CKSEG1ADDR(KN02XA_EAR); |
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static const char excstr[] = "exception"; |
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static const char intstr[] = "interrupt"; |
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static const char cpustr[] = "CPU"; |
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static const char mreadstr[] = "memory read"; |
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static const char readstr[] = "read"; |
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static const char writestr[] = "write"; |
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static const char timestr[] = "timeout"; |
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static const char paritystr[] = "parity error"; |
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static const char lanestat[][4] = { " OK", "BAD" }; |
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const char *kind, *agent, *cycle, *event; |
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unsigned long address; |
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u32 mer = *kn02xa_mer; |
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u32 ear = *kn02xa_ear; |
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int action = MIPS_BE_FATAL; |
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/* Ack ASAP, so that any subsequent errors get caught. */ |
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dec_kn02xa_be_ack(); |
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kind = invoker ? intstr : excstr; |
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/* No DMA errors? */ |
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agent = cpustr; |
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address = ear & KN02XA_EAR_ADDRESS; |
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/* Low 256MB is decoded as memory, high -- as TC. */ |
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if (address < 0x10000000) { |
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cycle = mreadstr; |
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event = paritystr; |
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} else { |
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cycle = invoker ? writestr : readstr; |
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event = timestr; |
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} |
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if (is_fixup) |
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action = MIPS_BE_FIXUP; |
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if (action != MIPS_BE_FIXUP) |
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printk(KERN_ALERT "Bus error %s: %s %s %s at %#010lx\n", |
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kind, agent, cycle, event, address); |
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if (action != MIPS_BE_FIXUP && address < 0x10000000) |
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printk(KERN_ALERT " Byte lane status %#3x -- " |
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"#3: %s, #2: %s, #1: %s, #0: %s\n", |
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(mer & KN02XA_MER_BYTERR) >> 8, |
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lanestat[(mer & KN02XA_MER_BYTERR_3) != 0], |
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lanestat[(mer & KN02XA_MER_BYTERR_2) != 0], |
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lanestat[(mer & KN02XA_MER_BYTERR_1) != 0], |
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lanestat[(mer & KN02XA_MER_BYTERR_0) != 0]); |
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return action; |
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} |
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int dec_kn02xa_be_handler(struct pt_regs *regs, int is_fixup) |
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{ |
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return dec_kn02xa_be_backend(regs, is_fixup, 0); |
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} |
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irqreturn_t dec_kn02xa_be_interrupt(int irq, void *dev_id) |
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{ |
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struct pt_regs *regs = get_irq_regs(); |
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int action = dec_kn02xa_be_backend(regs, 0, 1); |
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if (action == MIPS_BE_DISCARD) |
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return IRQ_HANDLED; |
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/* |
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* FIXME: Find the affected processes and kill them, otherwise |
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* we must die. |
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* |
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* The interrupt is asynchronously delivered thus EPC and RA |
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* may be irrelevant, but are printed for a reference. |
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*/ |
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printk(KERN_ALERT "Fatal bus interrupt, epc == %08lx, ra == %08lx\n", |
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regs->cp0_epc, regs->regs[31]); |
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die("Unrecoverable bus error", regs); |
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} |
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void __init dec_kn02xa_be_init(void) |
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{ |
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volatile u32 *mbcs = (void *)CKSEG1ADDR(KN4K_SLOT_BASE + KN4K_MB_CSR); |
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/* For KN04 we need to make sure EE (?) is enabled in the MB. */ |
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if (current_cpu_type() == CPU_R4000SC) |
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*mbcs |= KN4K_MB_CSR_EE; |
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fast_iob(); |
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/* Clear any leftover errors from the firmware. */ |
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dec_kn02xa_be_ack(); |
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}
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