/* * ip22-berr.c: Bus error handling. * * Copyright (C) 2002, 2003 Ladislav Michl (ladis@linux-mips.org) */#include <linux/init.h>#include <linux/kernel.h>#include <linux/sched.h>#include <asm/addrspace.h>#include <asm/system.h>#include <asm/traps.h>#include <asm/branch.h>#include <asm/sgi/mc.h>#include <asm/sgi/hpc3.h>#include <asm/sgi/ioc.h>#include <asm/sgi/ip22.h>static unsigned int cpu_err_stat;	/* Status reg for CPU */static unsigned int gio_err_stat;	/* Status reg for GIO */static unsigned int cpu_err_addr;	/* Error address reg for CPU */static unsigned int gio_err_addr;	/* Error address reg for GIO */static unsigned int extio_stat;static unsigned int hpc3_berr_stat;	/* Bus error interrupt status */static void save_and_clear_buserr(void){	/* save status registers */	cpu_err_addr = sgimc->cerr;	cpu_err_stat = sgimc->cstat;	gio_err_addr = sgimc->gerr;	gio_err_stat = sgimc->gstat;	extio_stat = ip22_is_fullhouse() ? sgioc->extio : (sgint->errstat << 4);	hpc3_berr_stat = hpc3c0->bestat;	sgimc->cstat = sgimc->gstat = 0;}#define GIO_ERRMASK	0xff00#define CPU_ERRMASK	0x3f00static void print_buserr(void){	if (extio_stat & EXTIO_MC_BUSERR)		printk(KERN_ERR "MC Bus Error\n");	if (extio_stat & EXTIO_HPC3_BUSERR)		printk(KERN_ERR "HPC3 Bus Error 0x%x:<id=0x%x,%s,lane=0x%x>\n",			hpc3_berr_stat,			(hpc3_berr_stat & HPC3_BESTAT_PIDMASK) >>					  HPC3_BESTAT_PIDSHIFT,			(hpc3_berr_stat & HPC3_BESTAT_CTYPE) ? "PIO" : "DMA",			hpc3_berr_stat & HPC3_BESTAT_BLMASK);	if (extio_stat & EXTIO_EISA_BUSERR)		printk(KERN_ERR "EISA Bus Error\n");	if (cpu_err_stat & CPU_ERRMASK)		printk(KERN_ERR "CPU error 0x%x<%s%s%s%s%s%s> @ 0x%08x\n",			cpu_err_stat,			cpu_err_stat & SGIMC_CSTAT_RD ? "RD " : "",			cpu_err_stat & SGIMC_CSTAT_PAR ? "PAR " : "",			cpu_err_stat & SGIMC_CSTAT_ADDR ? "ADDR " : "",			cpu_err_stat & SGIMC_CSTAT_SYSAD_PAR ? "SYSAD " : "",			cpu_err_stat & SGIMC_CSTAT_SYSCMD_PAR ? "SYSCMD " : "",			cpu_err_stat & SGIMC_CSTAT_BAD_DATA ? "BAD_DATA " : "",			cpu_err_addr);	if (gio_err_stat & GIO_ERRMASK)		printk(KERN_ERR "GIO error 0x%x:<%s%s%s%s%s%s%s%s> @ 0x%08x\n",			gio_err_stat,			gio_err_stat & SGIMC_GSTAT_RD ? "RD " : "",			gio_err_stat & SGIMC_GSTAT_WR ? "WR " : "",			gio_err_stat & SGIMC_GSTAT_TIME ? "TIME " : "",			gio_err_stat & SGIMC_GSTAT_PROM ? "PROM " : "",			gio_err_stat & SGIMC_GSTAT_ADDR ? "ADDR " : "",			gio_err_stat & SGIMC_GSTAT_BC ? "BC " : "",			gio_err_stat & SGIMC_GSTAT_PIO_RD ? "PIO_RD " : "",			gio_err_stat & SGIMC_GSTAT_PIO_WR ? "PIO_WR " : "",			gio_err_addr);}/* * MC sends an interrupt whenever bus or parity errors occur. In addition, * if the error happened during a CPU read, it also asserts the bus error * pin on the R4K. Code in bus error handler save the MC bus error registers * and then clear the interrupt when this happens. */void ip22_be_interrupt(int irq, struct pt_regs *regs){	const int field = 2 * sizeof(unsigned long);	save_and_clear_buserr();	print_buserr();	printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",	       (regs->cp0_cause & 4) ? "Data" : "Instruction",	       field, regs->cp0_epc, field, regs->regs[31]);	/* Assume it would be too dangerous to continue ... */	die_if_kernel("Oops", regs);	force_sig(SIGBUS, current);}static int ip22_be_handler(struct pt_regs *regs, int is_fixup){	save_and_clear_buserr();	if (is_fixup)		return MIPS_BE_FIXUP;	print_buserr();	return MIPS_BE_FATAL;}void __init ip22_be_init(void){	board_be_handler = ip22_be_handler;}