/*
   * Carsten Langgaard, carstenl@mips.com
   * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
   * Copyright (C) 2001 Ralf Baechle
   *
   *  This program is free software; you can distribute it and/or modify it
   *  under the terms of the GNU General Public License (Version 2) as
   *  published by the Free Software Foundation.
   *
   *  This program is distributed in the hope it will be useful, but WITHOUT
   *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   *  for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
   *
   * Routines for generic manipulation of the interrupts found on the MIPS
   * Malta board.
   * The interrupt controller is located in the South Bridge a PIIX4 device
   * with two internal 82C95 interrupt controllers.
   */
  #include <linux/init.h>
  #include <linux/irq.h>
  #include <linux/sched.h>

  #include <linux/smp.h>

  #include <linux/interrupt.h>

  #include <linux/io.h>

  #include <linux/kernel_stat.h>

  #include <linux/kernel.h>

  #include <linux/random.h>

  #include <asm/traps.h>

  #include <asm/i8259.h>

  #include <asm/irq_cpu.h>

  #include <asm/irq_regs.h>

  #include <asm/mips-boards/malta.h>
  #include <asm/mips-boards/maltaint.h>
  #include <asm/mips-boards/piix4.h>
  #include <asm/gt64120.h>
  #include <asm/mips-boards/generic.h>
  #include <asm/mips-boards/msc01_pci.h>

  #include <asm/msc01_ic.h>

  #include <asm/gic.h>
  #include <asm/gcmpregs.h>
  
  int gcmp_present = -1;
  int gic_present;
  static unsigned long _msc01_biu_base;
  static unsigned long _gcmp_base;
  static unsigned int ipi_map[NR_CPUS];

  static DEFINE_RAW_SPINLOCK(mips_irq_lock);

  
  static inline int mips_pcibios_iack(void)
  {
  	int irq;

  
  	/*
  	 * Determine highest priority pending interrupt by performing
  	 * a PCI Interrupt Acknowledge cycle.
  	 */

  	switch (mips_revision_sconid) {
  	case MIPS_REVISION_SCON_SOCIT:
  	case MIPS_REVISION_SCON_ROCIT:
  	case MIPS_REVISION_SCON_SOCITSC:
  	case MIPS_REVISION_SCON_SOCITSCP:

  		MSC_READ(MSC01_PCI_IACK, irq);

  		irq &= 0xff;
  		break;

  	case MIPS_REVISION_SCON_GT64120:

  		irq = GT_READ(GT_PCI0_IACK_OFS);
  		irq &= 0xff;
  		break;

  	case MIPS_REVISION_SCON_BONITO:

  		/* The following will generate a PCI IACK cycle on the
  		 * Bonito controller. It's a little bit kludgy, but it
  		 * was the easiest way to implement it in hardware at
  		 * the given time.
  		 */
  		BONITO_PCIMAP_CFG = 0x20000;
  
  		/* Flush Bonito register block */

  		(void) BONITO_PCIMAP_CFG;

  		iob();    /* sync */

  		irq = __raw_readl((u32 *)_pcictrl_bonito_pcicfg);

  		iob();    /* sync */
  		irq &= 0xff;
  		BONITO_PCIMAP_CFG = 0;
  		break;
  	default:

  		printk(KERN_WARNING "Unknown system controller.
  ");

  		return -1;
  	}
  	return irq;
  }

  static inline int get_int(void)

  {
  	unsigned long flags;

  	int irq;

  	raw_spin_lock_irqsave(&mips_irq_lock, flags);

  	irq = mips_pcibios_iack();

  
  	/*

  	 * The only way we can decide if an interrupt is spurious
  	 * is by checking the 8259 registers.  This needs a spinlock
  	 * on an SMP system,  so leave it up to the generic code...

  	 */

  	raw_spin_unlock_irqrestore(&mips_irq_lock, flags);

  	return irq;

  }

  static void malta_hw0_irqdispatch(void)

  {
  	int irq;

  	irq = get_int();

  	if (irq < 0) {

  		/* interrupt has already been cleared */
  		return;

  	}

  	do_IRQ(MALTA_INT_BASE + irq);

  }

  static void malta_ipi_irqdispatch(void)
  {
  	int irq;
  
  	irq = gic_get_int();
  	if (irq < 0)
  		return;  /* interrupt has already been cleared */
  
  	do_IRQ(MIPS_GIC_IRQ_BASE + irq);
  }

  static void corehi_irqdispatch(void)

  {

  	unsigned int intedge, intsteer, pcicmd, pcibadaddr;

  	unsigned int pcimstat, intisr, inten, intpol;

  	unsigned int intrcause, datalo, datahi;

  	struct pt_regs *regs = get_irq_regs();

  	printk(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!
  ");
  	printk(KERN_EMERG "epc   : %08lx
  Status: %08lx
  "

  			"Cause : %08lx
  badVaddr : %08lx
  ",
  			regs->cp0_epc, regs->cp0_status,
  			regs->cp0_cause, regs->cp0_badvaddr);

  
  	/* Read all the registers and then print them as there is a
  	   problem with interspersed printk's upsetting the Bonito controller.
  	   Do it for the others too.
  	*/

  	switch (mips_revision_sconid) {

  	case MIPS_REVISION_SCON_SOCIT:

  	case MIPS_REVISION_SCON_ROCIT:
  	case MIPS_REVISION_SCON_SOCITSC:
  	case MIPS_REVISION_SCON_SOCITSCP:

  		ll_msc_irq();
  		break;
  	case MIPS_REVISION_SCON_GT64120:
  		intrcause = GT_READ(GT_INTRCAUSE_OFS);
  		datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
  		datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);

  		printk(KERN_EMERG "GT_INTRCAUSE = %08x
  ", intrcause);
  		printk(KERN_EMERG "GT_CPUERR_ADDR = %02x%08x
  ",
  				datahi, datalo);

  		break;
  	case MIPS_REVISION_SCON_BONITO:
  		pcibadaddr = BONITO_PCIBADADDR;
  		pcimstat = BONITO_PCIMSTAT;
  		intisr = BONITO_INTISR;
  		inten = BONITO_INTEN;
  		intpol = BONITO_INTPOL;
  		intedge = BONITO_INTEDGE;
  		intsteer = BONITO_INTSTEER;
  		pcicmd = BONITO_PCICMD;

  		printk(KERN_EMERG "BONITO_INTISR = %08x
  ", intisr);
  		printk(KERN_EMERG "BONITO_INTEN = %08x
  ", inten);
  		printk(KERN_EMERG "BONITO_INTPOL = %08x
  ", intpol);
  		printk(KERN_EMERG "BONITO_INTEDGE = %08x
  ", intedge);
  		printk(KERN_EMERG "BONITO_INTSTEER = %08x
  ", intsteer);
  		printk(KERN_EMERG "BONITO_PCICMD = %08x
  ", pcicmd);
  		printk(KERN_EMERG "BONITO_PCIBADADDR = %08x
  ", pcibadaddr);
  		printk(KERN_EMERG "BONITO_PCIMSTAT = %08x
  ", pcimstat);

  		break;
  	}

  	die("CoreHi interrupt", regs);

  }

  static inline int clz(unsigned long x)
  {

  	__asm__(

  	"	.set	push					
  "
  	"	.set	mips32					
  "
  	"	clz	%0, %1					
  "
  	"	.set	pop					
  "
  	: "=r" (x)
  	: "r" (x));
  
  	return x;
  }
  
  /*
   * Version of ffs that only looks at bits 12..15.
   */
  static inline unsigned int irq_ffs(unsigned int pending)
  {
  #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
  	return -clz(pending) + 31 - CAUSEB_IP;
  #else
  	unsigned int a0 = 7;
  	unsigned int t0;

  	t0 = pending & 0xf000;

  	t0 = t0 < 1;
  	t0 = t0 << 2;
  	a0 = a0 - t0;

  	pending = pending << t0;

  	t0 = pending & 0xc000;

  	t0 = t0 < 1;
  	t0 = t0 << 1;
  	a0 = a0 - t0;

  	pending = pending << t0;

  	t0 = pending & 0x8000;

  	t0 = t0 < 1;

  	/* t0 = t0 << 2; */

  	a0 = a0 - t0;

  	/* pending = pending << t0; */

  
  	return a0;
  #endif
  }
  
  /*
   * IRQs on the Malta board look basically (barring software IRQs which we
   * don't use at all and all external interrupt sources are combined together
   * on hardware interrupt 0 (MIPS IRQ 2)) like:
   *
   *	MIPS IRQ	Source
   *      --------        ------
   *             0	Software (ignored)
   *             1        Software (ignored)
   *             2        Combined hardware interrupt (hw0)
   *             3        Hardware (ignored)
   *             4        Hardware (ignored)
   *             5        Hardware (ignored)
   *             6        Hardware (ignored)
   *             7        R4k timer (what we use)
   *
   * We handle the IRQ according to _our_ priority which is:
   *
   * Highest ----     R4k Timer
   * Lowest  ----     Combined hardware interrupt
   *
   * then we just return, if multiple IRQs are pending then we will just take
   * another exception, big deal.
   */

  asmlinkage void plat_irq_dispatch(void)

  {
  	unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
  	int irq;
  
  	irq = irq_ffs(pending);
  
  	if (irq == MIPSCPU_INT_I8259A)

  		malta_hw0_irqdispatch();

  	else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
  		malta_ipi_irqdispatch();

  	else if (irq >= 0)

  		do_IRQ(MIPS_CPU_IRQ_BASE + irq);

  	else

  		spurious_interrupt();

  }

  #ifdef CONFIG_MIPS_MT_SMP
  
  
  #define GIC_MIPS_CPU_IPI_RESCHED_IRQ	3
  #define GIC_MIPS_CPU_IPI_CALL_IRQ	4
  
  #define MIPS_CPU_IPI_RESCHED_IRQ 0	/* SW int 0 for resched */
  #define C_RESCHED C_SW0
  #define MIPS_CPU_IPI_CALL_IRQ 1		/* SW int 1 for resched */
  #define C_CALL C_SW1
  static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
  
  static void ipi_resched_dispatch(void)
  {
  	do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
  }
  
  static void ipi_call_dispatch(void)
  {
  	do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
  }
  
  static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
  {

  	scheduler_ipi();

  	return IRQ_HANDLED;
  }
  
  static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
  {
  	smp_call_function_interrupt();
  
  	return IRQ_HANDLED;
  }
  
  static struct irqaction irq_resched = {
  	.handler	= ipi_resched_interrupt,

  	.flags		= IRQF_PERCPU,

  	.name		= "IPI_resched"
  };
  
  static struct irqaction irq_call = {
  	.handler	= ipi_call_interrupt,

  	.flags		= IRQF_PERCPU,

  	.name		= "IPI_call"
  };

  #endif /* CONFIG_MIPS_MT_SMP */

  
  static int gic_resched_int_base;
  static int gic_call_int_base;
  #define GIC_RESCHED_INT(cpu) (gic_resched_int_base+(cpu))
  #define GIC_CALL_INT(cpu) (gic_call_int_base+(cpu))

  
  unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
  {
  	return GIC_CALL_INT(cpu);
  }
  
  unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
  {
  	return GIC_RESCHED_INT(cpu);
  }

  static struct irqaction i8259irq = {
  	.handler = no_action,

  	.name = "XT-PIC cascade",
  	.flags = IRQF_NO_THREAD,

  };
  
  static struct irqaction corehi_irqaction = {
  	.handler = no_action,

  	.name = "CoreHi",
  	.flags = IRQF_NO_THREAD,

  };

  static msc_irqmap_t __initdata msc_irqmap[] = {

  	{MSC01C_INT_TMR,		MSC01_IRQ_EDGE, 0},
  	{MSC01C_INT_PCI,		MSC01_IRQ_LEVEL, 0},
  };

  static int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);

  static msc_irqmap_t __initdata msc_eicirqmap[] = {

  	{MSC01E_INT_SW0,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_SW1,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_I8259A,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_SMI,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_COREHI,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_CORELO,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_TMR,		MSC01_IRQ_EDGE, 0},
  	{MSC01E_INT_PCI,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_PERFCTR,		MSC01_IRQ_LEVEL, 0},
  	{MSC01E_INT_CPUCTR,		MSC01_IRQ_LEVEL, 0}
  };

  static int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);

  /*
   * This GIC specific tabular array defines the association between External
   * Interrupts and CPUs/Core Interrupts. The nature of the External
   * Interrupts is also defined here - polarity/trigger.
   */

  
  #define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK

  #define X GIC_UNUSED

  static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {

  	{ X, X,		   X,		X,		0 },
  	{ X, X,		   X,	 	X,		0 },
  	{ X, X,		   X,		X,		0 },
  	{ 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ X, X,		   X,		X,		0 },
  	{ X, X,		   X,		X,		0 },
  	{ 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_NMI,  GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ 0, GIC_CPU_NMI,  GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
  	{ X, X,		   X,		X,	        0 },
  	/* The remainder of this table is initialised by fill_ipi_map */

  };

  #undef X

  
  /*
   * GCMP needs to be detected before any SMP initialisation
   */

  int __init gcmp_probe(unsigned long addr, unsigned long size)

  {

  	if (mips_revision_sconid != MIPS_REVISION_SCON_ROCIT) {
  		gcmp_present = 0;
  		return gcmp_present;
  	}

  	if (gcmp_present >= 0)
  		return gcmp_present;
  
  	_gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
  	_msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
  	gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR;
  
  	if (gcmp_present)

  		pr_debug("GCMP present
  ");

  	return gcmp_present;
  }

  /* Return the number of IOCU's present */
  int __init gcmp_niocu(void)
  {
    return gcmp_present ?
      (GCMPGCB(GC) & GCMP_GCB_GC_NUMIOCU_MSK) >> GCMP_GCB_GC_NUMIOCU_SHF :
      0;
  }
  
  /* Set GCMP region attributes */
  void __init gcmp_setregion(int region, unsigned long base,
  			   unsigned long mask, int type)
  {
  	GCMPGCBn(CMxBASE, region) = base;
  	GCMPGCBn(CMxMASK, region) = mask | type;
  }

  #if defined(CONFIG_MIPS_MT_SMP)

  static void __init fill_ipi_map1(int baseintr, int cpu, int cpupin)
  {
  	int intr = baseintr + cpu;

  	gic_intr_map[intr].cpunum = cpu;
  	gic_intr_map[intr].pin = cpupin;
  	gic_intr_map[intr].polarity = GIC_POL_POS;
  	gic_intr_map[intr].trigtype = GIC_TRIG_EDGE;

  	gic_intr_map[intr].flags = GIC_FLAG_IPI;

  	ipi_map[cpu] |= (1 << (cpupin + 2));
  }

  static void __init fill_ipi_map(void)

  {

  	int cpu;

  	for (cpu = 0; cpu < NR_CPUS; cpu++) {
  		fill_ipi_map1(gic_resched_int_base, cpu, GIC_CPU_INT1);
  		fill_ipi_map1(gic_call_int_base, cpu, GIC_CPU_INT2);

  	}
  }

  #endif

  void __init arch_init_ipiirq(int irq, struct irqaction *action)
  {
  	setup_irq(irq, action);

  	irq_set_handler(irq, handle_percpu_irq);

  }

  void __init arch_init_irq(void)
  {

  	init_i8259_irqs();

  
  	if (!cpu_has_veic)

  		mips_cpu_irq_init();

  	if (gcmp_present)  {
  		GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
  		gic_present = 1;
  	} else {

  		if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
  			_msc01_biu_base = (unsigned long)
  					ioremap_nocache(MSC01_BIU_REG_BASE,
  						MSC01_BIU_ADDRSPACE_SZ);
  			gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
  					MSC01_SC_CFG_GICPRES_MSK) >>
  					MSC01_SC_CFG_GICPRES_SHF;
  		}

  	}
  	if (gic_present)

  		pr_debug("GIC present
  ");

  	switch (mips_revision_sconid) {
  	case MIPS_REVISION_SCON_SOCIT:
  	case MIPS_REVISION_SCON_ROCIT:

  		if (cpu_has_veic)

  			init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
  					MSC01E_INT_BASE, msc_eicirqmap,
  					msc_nr_eicirqs);

  		else

  			init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
  					MSC01C_INT_BASE, msc_irqmap,
  					msc_nr_irqs);

  		break;

  	case MIPS_REVISION_SCON_SOCITSC:
  	case MIPS_REVISION_SCON_SOCITSCP:

  		if (cpu_has_veic)

  			init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
  					MSC01E_INT_BASE, msc_eicirqmap,
  					msc_nr_eicirqs);

  		else

  			init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
  					MSC01C_INT_BASE, msc_irqmap,
  					msc_nr_irqs);

  	}
  
  	if (cpu_has_veic) {

  		set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
  		set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
  		setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
  		setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);

  	} else if (cpu_has_vint) {

  		set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
  		set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);

  #ifdef CONFIG_MIPS_MT_SMTC

  		setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,

  			(0x100 << MIPSCPU_INT_I8259A));

  		setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,

  			&corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));

  		/*
  		 * Temporary hack to ensure that the subsidiary device
  		 * interrupts coing in via the i8259A, but associated
  		 * with low IRQ numbers, will restore the Status.IM
  		 * value associated with the i8259A.
  		 */
  		{
  			int i;
  
  			for (i = 0; i < 16; i++)
  				irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A);
  		}

  #else /* Not SMTC */

  		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);

  		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
  						&corehi_irqaction);

  #endif /* CONFIG_MIPS_MT_SMTC */

  	} else {

  		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);

  		setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
  						&corehi_irqaction);

  	}

  	if (gic_present) {
  		/* FIXME */
  		int i;

  #if defined(CONFIG_MIPS_MT_SMP)

  		gic_call_int_base = GIC_NUM_INTRS - NR_CPUS;
  		gic_resched_int_base = gic_call_int_base - NR_CPUS;

  		fill_ipi_map();

  #endif
  		gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map,
  				ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);

  		if (!gcmp_present) {
  			/* Enable the GIC */
  			i = REG(_msc01_biu_base, MSC01_SC_CFG);
  			REG(_msc01_biu_base, MSC01_SC_CFG) =
  				(i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
  			pr_debug("GIC Enabled
  ");
  		}

  #if defined(CONFIG_MIPS_MT_SMP)

  		/* set up ipi interrupts */
  		if (cpu_has_vint) {
  			set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
  			set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
  		}
  		/* Argh.. this really needs sorting out.. */
  		printk("CPU%d: status register was %08x
  ", smp_processor_id(), read_c0_status());
  		write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
  		printk("CPU%d: status register now %08x
  ", smp_processor_id(), read_c0_status());
  		write_c0_status(0x1100dc00);
  		printk("CPU%d: status register frc %08x
  ", smp_processor_id(), read_c0_status());

  		for (i = 0; i < NR_CPUS; i++) {

  			arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
  					 GIC_RESCHED_INT(i), &irq_resched);
  			arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
  					 GIC_CALL_INT(i), &irq_call);

  		}

  #endif

  	} else {

  #if defined(CONFIG_MIPS_MT_SMP)

  		/* set up ipi interrupts */
  		if (cpu_has_veic) {
  			set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
  			set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
  			cpu_ipi_resched_irq = MSC01E_INT_SW0;
  			cpu_ipi_call_irq = MSC01E_INT_SW1;
  		} else {
  			if (cpu_has_vint) {
  				set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
  				set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
  			}
  			cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
  			cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
  		}

  		arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
  		arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);

  #endif

  	}

  }
  
  void malta_be_init(void)
  {
  	if (gcmp_present) {
  		/* Could change CM error mask register */
  	}
  }
  
  
  static char *tr[8] = {
  	"mem",	"gcr",	"gic",	"mmio",
  	"0x04",	"0x05",	"0x06",	"0x07"
  };
  
  static char *mcmd[32] = {
  	[0x00] = "0x00",
  	[0x01] = "Legacy Write",
  	[0x02] = "Legacy Read",
  	[0x03] = "0x03",
  	[0x04] = "0x04",
  	[0x05] = "0x05",
  	[0x06] = "0x06",
  	[0x07] = "0x07",
  	[0x08] = "Coherent Read Own",
  	[0x09] = "Coherent Read Share",
  	[0x0a] = "Coherent Read Discard",
  	[0x0b] = "Coherent Ready Share Always",
  	[0x0c] = "Coherent Upgrade",
  	[0x0d] = "Coherent Writeback",
  	[0x0e] = "0x0e",
  	[0x0f] = "0x0f",
  	[0x10] = "Coherent Copyback",
  	[0x11] = "Coherent Copyback Invalidate",
  	[0x12] = "Coherent Invalidate",
  	[0x13] = "Coherent Write Invalidate",
  	[0x14] = "Coherent Completion Sync",
  	[0x15] = "0x15",
  	[0x16] = "0x16",
  	[0x17] = "0x17",
  	[0x18] = "0x18",
  	[0x19] = "0x19",
  	[0x1a] = "0x1a",
  	[0x1b] = "0x1b",
  	[0x1c] = "0x1c",
  	[0x1d] = "0x1d",
  	[0x1e] = "0x1e",
  	[0x1f] = "0x1f"
  };
  
  static char *core[8] = {
  	"Invalid/OK", 	"Invalid/Data",
  	"Shared/OK",	"Shared/Data",
  	"Modified/OK",	"Modified/Data",
  	"Exclusive/OK",	"Exclusive/Data"
  };
  
  static char *causes[32] = {
  	"None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
  	"COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
  	"0x08", "0x09", "0x0a", "0x0b",
  	"0x0c", "0x0d", "0x0e", "0x0f",
  	"0x10", "0x11", "0x12", "0x13",
  	"0x14", "0x15", "0x16", "INTVN_WR_ERR",
  	"INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
  	"0x1c", "0x1d", "0x1e", "0x1f"
  };
  
  int malta_be_handler(struct pt_regs *regs, int is_fixup)
  {
  	/* This duplicates the handling in do_be which seems wrong */
  	int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
  
  	if (gcmp_present) {
  		unsigned long cm_error = GCMPGCB(GCMEC);
  		unsigned long cm_addr = GCMPGCB(GCMEA);
  		unsigned long cm_other = GCMPGCB(GCMEO);
  		unsigned long cause, ocause;
  		char buf[256];
  
  		cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK);
  		if (cause != 0) {
  			cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF;
  			if (cause < 16) {
  				unsigned long cca_bits = (cm_error >> 15) & 7;
  				unsigned long tr_bits = (cm_error >> 12) & 7;
  				unsigned long mcmd_bits = (cm_error >> 7) & 0x1f;
  				unsigned long stag_bits = (cm_error >> 3) & 15;
  				unsigned long sport_bits = (cm_error >> 0) & 7;
  
  				snprintf(buf, sizeof(buf),
  					 "CCA=%lu TR=%s MCmd=%s STag=%lu "
  					 "SPort=%lu
  ",
  					 cca_bits, tr[tr_bits], mcmd[mcmd_bits],
  					 stag_bits, sport_bits);
  			} else {
  				/* glob state & sresp together */
  				unsigned long c3_bits = (cm_error >> 18) & 7;
  				unsigned long c2_bits = (cm_error >> 15) & 7;
  				unsigned long c1_bits = (cm_error >> 12) & 7;
  				unsigned long c0_bits = (cm_error >> 9) & 7;
  				unsigned long sc_bit = (cm_error >> 8) & 1;
  				unsigned long mcmd_bits = (cm_error >> 3) & 0x1f;
  				unsigned long sport_bits = (cm_error >> 0) & 7;
  				snprintf(buf, sizeof(buf),
  					 "C3=%s C2=%s C1=%s C0=%s SC=%s "
  					 "MCmd=%s SPort=%lu
  ",
  					 core[c3_bits], core[c2_bits],
  					 core[c1_bits], core[c0_bits],
  					 sc_bit ? "True" : "False",
  					 mcmd[mcmd_bits], sport_bits);
  			}
  
  			ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >>
  				 GCMP_GCB_GMEO_ERROR_2ND_SHF;
  
  			printk("CM_ERROR=%08lx %s <%s>
  ", cm_error,
  			       causes[cause], buf);
  			printk("CM_ADDR =%08lx
  ", cm_addr);
  			printk("CM_OTHER=%08lx %s
  ", cm_other, causes[ocause]);
  
  			/* reprime cause register */
  			GCMPGCB(GCMEC) = 0;
  		}
  	}
  
  	return retval;

  }