1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle
7 * Copyright (C) 1999, 2000 by Silicon Graphics
8 * Copyright (C) 2002  Maciej W. Rozycki
9 */
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13
14#include <asm/module.h>
15#include <asm/sn/addrs.h>
16#include <asm/sn/arch.h>
17#include <asm/sn/sn0/hub.h>
18#include <asm/traps.h>
19#include <asm/uaccess.h>
20#include <asm/tlbdebug.h>
21
22static void dump_hub_information(unsigned long errst0, unsigned long errst1)
23{
24	static char *err_type[2][8] = {
25		{ NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
26		  NULL, NULL, NULL, NULL },
27		{ "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
28		  NULL, NULL, NULL, NULL }
29	};
30	int wrb = errst1 & PI_ERR_ST1_WRBRRB_MASK;
31
32	if (!(errst0 & PI_ERR_ST0_VALID_MASK)) {
33		printk("Hub does not contain valid error information\n");
34		return;
35	}
36
37
38	printk("Hub has valid error information:\n");
39	if (errst0 & PI_ERR_ST0_OVERRUN_MASK)
40		printk("Overrun is set.  Error stack may contain additional "
41		       "information.\n");
42	printk("Hub error address is %08lx\n",
43	       (errst0 & PI_ERR_ST0_ADDR_MASK) >> (PI_ERR_ST0_ADDR_SHFT - 3));
44	printk("Incoming message command 0x%lx\n",
45	       (errst0 & PI_ERR_ST0_CMD_MASK) >> PI_ERR_ST0_CMD_SHFT);
46	printk("Supplemental field of incoming message is 0x%lx\n",
47	       (errst0 & PI_ERR_ST0_SUPPL_MASK) >> PI_ERR_ST0_SUPPL_SHFT);
48	printk("T5 Rn (for RRB only) is 0x%lx\n",
49	       (errst0 & PI_ERR_ST0_REQNUM_MASK) >> PI_ERR_ST0_REQNUM_SHFT);
50	printk("Error type is %s\n", err_type[wrb]
51	       [(errst0 & PI_ERR_ST0_TYPE_MASK) >> PI_ERR_ST0_TYPE_SHFT]
52		? : "invalid");
53}
54
55int be_ip27_handler(struct pt_regs *regs, int is_fixup)
56{
57	unsigned long errst0, errst1;
58	int data = regs->cp0_cause & 4;
59	int cpu = LOCAL_HUB_L(PI_CPU_NUM);
60
61	if (is_fixup)
62		return MIPS_BE_FIXUP;
63
64	printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
65	       regs->cp0_epc);
66	printk("Hub information:\n");
67	printk("ERR_INT_PEND = 0x%06lx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
68	errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
69	errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
70	dump_hub_information(errst0, errst1);
71	show_regs(regs);
72	dump_tlb_all();
73	while(1);
74	force_sig(SIGBUS, current);
75}
76
77void __init bus_error_init(void)
78{
79	int cpu = LOCAL_HUB_L(PI_CPU_NUM);
80	int cpuoff = cpu << 8;
81
82	be_board_handler = be_ip27_handler;
83
84	LOCAL_HUB_S(PI_ERR_INT_PEND,
85	            cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
86	LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
87	LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
88	LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0);	/* Disable error stack */
89	LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
90}
91