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
dump_hub_information(unsigned long errst0,unsigned long errst1)22 static 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
ip27_be_handler(struct pt_regs * regs,int is_fixup)55 int ip27_be_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
ip27_be_init(void)77 void __init ip27_be_init(void)
78 {
79 /* XXX Initialize all the Hub & Bridge error handling here. */
80 int cpu = LOCAL_HUB_L(PI_CPU_NUM);
81 int cpuoff = cpu << 8;
82
83 board_be_handler = ip27_be_handler;
84
85 LOCAL_HUB_S(PI_ERR_INT_PEND,
86 cpu ? PI_ERR_CLEAR_ALL_B : PI_ERR_CLEAR_ALL_A);
87 LOCAL_HUB_S(PI_ERR_INT_MASK_A + cpuoff, 0);
88 LOCAL_HUB_S(PI_ERR_STACK_ADDR_A + cpuoff, 0);
89 LOCAL_HUB_S(PI_ERR_STACK_SIZE, 0); /* Disable error stack */
90 LOCAL_HUB_S(PI_SYSAD_ERRCHK_EN, PI_SYSAD_CHECK_ALL);
91 }
92