xref: /openbmc/linux/arch/mips/sgi-ip22/ip22-berr.c (revision 3dc4b6fb)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * ip22-berr.c: Bus error handling.
4  *
5  * Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org)
6  */
7 
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/sched/signal.h>
11 
12 #include <asm/addrspace.h>
13 #include <asm/traps.h>
14 #include <asm/branch.h>
15 #include <asm/irq_regs.h>
16 #include <asm/sgi/mc.h>
17 #include <asm/sgi/hpc3.h>
18 #include <asm/sgi/ioc.h>
19 #include <asm/sgi/ip22.h>
20 
21 
22 static unsigned int cpu_err_stat;	/* Status reg for CPU */
23 static unsigned int gio_err_stat;	/* Status reg for GIO */
24 static unsigned int cpu_err_addr;	/* Error address reg for CPU */
25 static unsigned int gio_err_addr;	/* Error address reg for GIO */
26 static unsigned int extio_stat;
27 static unsigned int hpc3_berr_stat;	/* Bus error interrupt status */
28 
29 static void save_and_clear_buserr(void)
30 {
31 	/* save status registers */
32 	cpu_err_addr = sgimc->cerr;
33 	cpu_err_stat = sgimc->cstat;
34 	gio_err_addr = sgimc->gerr;
35 	gio_err_stat = sgimc->gstat;
36 	extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4);
37 	hpc3_berr_stat = hpc3c0->bestat;
38 
39 	sgimc->cstat = sgimc->gstat = 0;
40 }
41 
42 #define GIO_ERRMASK	0xff00
43 #define CPU_ERRMASK	0x3f00
44 
45 static void print_buserr(void)
46 {
47 	if (extio_stat & EXTIO_MC_BUSERR)
48 		printk(KERN_ERR "MC Bus Error\n");
49 	if (extio_stat & EXTIO_HPC3_BUSERR)
50 		printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n",
51 			hpc3_berr_stat,
52 			(hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >>
53 					  HPC3_BESTAT_PIDSHIFT,
54 			(hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA",
55 			hpc3_berr_stat & HPC3_BESTAT_BLMASK);
56 	if (extio_stat & EXTIO_EISA_BUSERR)
57 		printk(KERN_ERR "EISA Bus Error\n");
58 	if (cpu_err_stat & CPU_ERRMASK)
59 		printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n",
60 			cpu_err_stat,
61 			cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "",
62 			cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "",
63 			cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "",
64 			cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "",
65 			cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "",
66 			cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "",
67 			cpu_err_addr);
68 	if (gio_err_stat & GIO_ERRMASK)
69 		printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n",
70 			gio_err_stat,
71 			gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "",
72 			gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "",
73 			gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "",
74 			gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "",
75 			gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "",
76 			gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "",
77 			gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "",
78 			gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "",
79 			gio_err_addr);
80 }
81 
82 /*
83  * MC sends an interrupt whenever bus or parity errors occur. In addition,
84  * if the error happened during a CPU read, it also asserts the bus error
85  * pin on the R4K. Code in bus error handler save the MC bus error registers
86  * and then clear the interrupt when this happens.
87  */
88 
89 void ip22_be_interrupt(int irq)
90 {
91 	const int field = 2 * sizeof(unsigned long);
92 	struct pt_regs *regs = get_irq_regs();
93 
94 	save_and_clear_buserr();
95 	print_buserr();
96 	printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
97 	       (regs->cp0_cause & 4) ? "Data" : "Instruction",
98 	       field, regs->cp0_epc, field, regs->regs[31]);
99 	/* Assume it would be too dangerous to continue ... */
100 	die_if_kernel("Oops", regs);
101 	force_sig(SIGBUS);
102 }
103 
104 static int ip22_be_handler(struct pt_regs *regs, int is_fixup)
105 {
106 	save_and_clear_buserr();
107 	if (is_fixup)
108 		return MIPS_BE_FIXUP;
109 	print_buserr();
110 	return MIPS_BE_FATAL;
111 }
112 
113 void __init ip22_be_init(void)
114 {
115 	board_be_handler = ip22_be_handler;
116 }
117