2 * Bus error event handling code for 5000-series systems equipped
3 * with parity error detection logic, i.e. DECstation/DECsystem
4 * 5000/120, /125, /133 (KN02-BA), 5000/150 (KN04-BA) and Personal
5 * DECstation/DECsystem 5000/20, /25, /33 (KN02-CA), 5000/50
8 * Copyright (c) 2005 Maciej W. Rozycki
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/kernel.h>
19 #include <linux/types.h>
21 #include <asm/addrspace.h>
22 #include <asm/irq_regs.h>
23 #include <asm/ptrace.h>
24 #include <asm/traps.h>
26 #include <asm/dec/kn02ca.h>
27 #include <asm/dec/kn02xa.h>
28 #include <asm/dec/kn05.h>
30 static inline void dec_kn02xa_be_ack(void)
32 volatile u32
*mer
= (void *)CKSEG1ADDR(KN02XA_MER
);
33 volatile u32
*mem_intr
= (void *)CKSEG1ADDR(KN02XA_MEM_INTR
);
35 *mer
= KN02CA_MER_INTR
; /* Clear errors; keep the ARC IRQ. */
36 *mem_intr
= 0; /* Any write clears the bus IRQ. */
40 static int dec_kn02xa_be_backend(struct pt_regs
*regs
, int is_fixup
,
43 volatile u32
*kn02xa_mer
= (void *)CKSEG1ADDR(KN02XA_MER
);
44 volatile u32
*kn02xa_ear
= (void *)CKSEG1ADDR(KN02XA_EAR
);
46 static const char excstr
[] = "exception";
47 static const char intstr
[] = "interrupt";
48 static const char cpustr
[] = "CPU";
49 static const char mreadstr
[] = "memory read";
50 static const char readstr
[] = "read";
51 static const char writestr
[] = "write";
52 static const char timestr
[] = "timeout";
53 static const char paritystr
[] = "parity error";
54 static const char lanestat
[][4] = { " OK", "BAD" };
56 const char *kind
, *agent
, *cycle
, *event
;
57 unsigned long address
;
59 u32 mer
= *kn02xa_mer
;
60 u32 ear
= *kn02xa_ear
;
61 int action
= MIPS_BE_FATAL
;
63 /* Ack ASAP, so that any subsequent errors get caught. */
66 kind
= invoker
? intstr
: excstr
;
71 address
= ear
& KN02XA_EAR_ADDRESS
;
73 /* Low 256MB is decoded as memory, high -- as TC. */
74 if (address
< 0x10000000) {
78 cycle
= invoker
? writestr
: readstr
;
83 action
= MIPS_BE_FIXUP
;
85 if (action
!= MIPS_BE_FIXUP
)
86 printk(KERN_ALERT
"Bus error %s: %s %s %s at %#010lx\n",
87 kind
, agent
, cycle
, event
, address
);
89 if (action
!= MIPS_BE_FIXUP
&& address
< 0x10000000)
90 printk(KERN_ALERT
" Byte lane status %#3x -- "
91 "#3: %s, #2: %s, #1: %s, #0: %s\n",
92 (mer
& KN02XA_MER_BYTERR
) >> 8,
93 lanestat
[(mer
& KN02XA_MER_BYTERR_3
) != 0],
94 lanestat
[(mer
& KN02XA_MER_BYTERR_2
) != 0],
95 lanestat
[(mer
& KN02XA_MER_BYTERR_1
) != 0],
96 lanestat
[(mer
& KN02XA_MER_BYTERR_0
) != 0]);
101 int dec_kn02xa_be_handler(struct pt_regs
*regs
, int is_fixup
)
103 return dec_kn02xa_be_backend(regs
, is_fixup
, 0);
106 irqreturn_t
dec_kn02xa_be_interrupt(int irq
, void *dev_id
)
108 struct pt_regs
*regs
= get_irq_regs();
109 int action
= dec_kn02xa_be_backend(regs
, 0, 1);
111 if (action
== MIPS_BE_DISCARD
)
115 * FIXME: Find the affected processes and kill them, otherwise
118 * The interrupt is asynchronously delivered thus EPC and RA
119 * may be irrelevant, but are printed for a reference.
121 printk(KERN_ALERT
"Fatal bus interrupt, epc == %08lx, ra == %08lx\n",
122 regs
->cp0_epc
, regs
->regs
[31]);
123 die("Unrecoverable bus error", regs
);
127 void __init
dec_kn02xa_be_init(void)
129 volatile u32
*mbcs
= (void *)CKSEG1ADDR(KN4K_SLOT_BASE
+ KN4K_MB_CSR
);
131 /* For KN04 we need to make sure EE (?) is enabled in the MB. */
132 if (current_cpu_type() == CPU_R4000SC
)
133 *mbcs
|= KN4K_MB_CSR_EE
;
136 /* Clear any leftover errors from the firmware. */
This page took 0.03364 seconds and 6 git commands to generate.