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/signal.h>	/* for SIGBUS */
13#include <linux/sched.h>	/* schow_regs(), force_sig() */
14#include <linux/sched/debug.h>
15#include <linux/sched/signal.h>
16
17#include <asm/ptrace.h>
18#include <asm/sn/addrs.h>
19#include <asm/sn/agent.h>
20#include <asm/sn/arch.h>
21#include <asm/tlbdebug.h>
22#include <asm/traps.h>
23#include <linux/uaccess.h>
24
25#include "ip27-common.h"
26
27static void dump_hub_information(unsigned long errst0, unsigned long errst1)
28{
29	static char *err_type[2][8] = {
30		{ NULL, "Uncached Partial Read PRERR", "DERR", "Read Timeout",
31		  NULL, NULL, NULL, NULL },
32		{ "WERR", "Uncached Partial Write", "PWERR", "Write Timeout",
33		  NULL, NULL, NULL, NULL }
34	};
35	union pi_err_stat0 st0;
36	union pi_err_stat1 st1;
37
38	st0.pi_stat0_word = errst0;
39	st1.pi_stat1_word = errst1;
40
41	if (!st0.pi_stat0_fmt.s0_valid) {
42		pr_info("Hub does not contain valid error information\n");
43		return;
44	}
45
46	pr_info("Hub has valid error information:\n");
47	if (st0.pi_stat0_fmt.s0_ovr_run)
48		pr_info("Overrun is set. Error stack may contain additional "
49		       "information.\n");
50	pr_info("Hub error address is %08lx\n",
51		(unsigned long)st0.pi_stat0_fmt.s0_addr);
52	pr_info("Incoming message command 0x%lx\n",
53		(unsigned long)st0.pi_stat0_fmt.s0_cmd);
54	pr_info("Supplemental field of incoming message is 0x%lx\n",
55		(unsigned long)st0.pi_stat0_fmt.s0_supl);
56	pr_info("T5 Rn (for RRB only) is 0x%lx\n",
57		(unsigned long)st0.pi_stat0_fmt.s0_t5_req);
58	pr_info("Error type is %s\n", err_type[st1.pi_stat1_fmt.s1_rw_rb]
59	       [st0.pi_stat0_fmt.s0_err_type] ? : "invalid");
60}
61
62static int ip27_be_handler(struct pt_regs *regs, int is_fixup)
63{
64	unsigned long errst0, errst1;
65	int data = regs->cp0_cause & 4;
66	int cpu = LOCAL_HUB_L(PI_CPU_NUM);
67
68	if (is_fixup)
69		return MIPS_BE_FIXUP;
70
71	printk("Slice %c got %cbe at 0x%lx\n", 'A' + cpu, data ? 'd' : 'i',
72	       regs->cp0_epc);
73	printk("Hub information:\n");
74	printk("ERR_INT_PEND = 0x%06llx\n", LOCAL_HUB_L(PI_ERR_INT_PEND));
75	errst0 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS0_B : PI_ERR_STATUS0_A);
76	errst1 = LOCAL_HUB_L(cpu ? PI_ERR_STATUS1_B : PI_ERR_STATUS1_A);
77	dump_hub_information(errst0, errst1);
78	show_regs(regs);
79	dump_tlb_all();
80	while(1);
81	force_sig(SIGBUS);
82}
83
84void __init ip27_be_init(void)
85{
86	/* XXX Initialize all the Hub & Bridge error handling here.  */
87	int cpu = LOCAL_HUB_L(PI_CPU_NUM);
88	int cpuoff = cpu << 8;
89
90	mips_set_be_handler(ip27_be_handler);
91
92	LOCAL_HUB_S(PI_ERR_INT_PEND,
93		    cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
94	LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
95	LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
96	LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0);	/* Disable error stack */
97	LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
98}
99