arch/mips/mips-boards/malta/malta_int.c - maze/linux - Git at Google

 /*
  * 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/slab.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 #include <linux/kernel.h>
 #include <linux/random.h>

 #include <asm/i8259.h>
 #include <asm/irq_cpu.h>
 #include <asm/io.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>

 static DEFINE_SPINLOCK(mips_irq_lock);

 static inline int mips_pcibios_iack(void)
 {
 	int irq;
         u32 dummy;

 	/*
 	 * 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 */
 		dummy = BONITO_PCIMAP_CFG;
 		iob();    /* sync */

 		irq = readl((u32 *)_pcictrl_bonito_pcicfg);
 		iob();    /* sync */
 		irq &= 0xff;
 		BONITO_PCIMAP_CFG = 0;
 		break;
 	default:
 	        printk("Unknown system controller.\n");
 		return -1;
 	}
 	return irq;
 }

 static inline int get_int(void)
 {
 	unsigned long flags;
 	int irq;
 	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...
 	 */

 	spin_unlock_irqrestore(&mips_irq_lock, flags);

 	return irq;
 }

 static void malta_hw0_irqdispatch(void)
 {
 	int irq;

 	irq = get_int();
 	if (irq < 0) {
 		return;  /* interrupt has already been cleared */
 	}

 	do_IRQ(MALTA_INT_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("CoreHI interrupt, shouldn't happen, so we die here!!!\n");
         printk("epc   : %08lx\nStatus: %08lx\n"
 	       "Cause : %08lx\nbadVaddr : %08lx\n",
 	       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("GT_INTRCAUSE = %08x\n", intrcause);
                 printk("GT_CPUERR_ADDR = %02x%08x\n", 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("BONITO_INTISR = %08x\n", intisr);
                 printk("BONITO_INTEN = %08x\n", inten);
                 printk("BONITO_INTPOL = %08x\n", intpol);
                 printk("BONITO_INTEDGE = %08x\n", intedge);
                 printk("BONITO_INTSTEER = %08x\n", intsteer);
                 printk("BONITO_PCICMD = %08x\n", pcicmd);
                 printk("BONITO_PCIBADADDR = %08x\n", pcibadaddr);
                 printk("BONITO_PCIMSTAT = %08x\n", pcimstat);
                 break;
         }

         /* We die here*/
         die("CoreHi interrupt", regs);
 }

 static inline int clz(unsigned long x)
 {
 	__asm__(
 	"	.set	push					\n"
 	"	.set	mips32					\n"
 	"	clz	%0, %1					\n"
 	"	.set	pop					\n"
 	: "=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 (irq >= 0)
 		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 	else
 		spurious_interrupt();
 }

 static struct irqaction i8259irq = {
 	.handler = no_action,
 	.name = "XT-PIC cascade"
 };

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

 msc_irqmap_t __initdata msc_irqmap[] = {
 	{MSC01C_INT_TMR,		MSC01_IRQ_EDGE, 0},
 	{MSC01C_INT_PCI,		MSC01_IRQ_LEVEL, 0},
 };
 int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);

 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}
 };
 int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);

 void __init arch_init_irq(void)
 {
 	init_i8259_irqs();

 	if (!cpu_has_veic)
 		mips_cpu_irq_init();

         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);
 	}
 }
	/*
	* 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/slab.h>
	#include <linux/interrupt.h>
	#include <linux/kernel_stat.h>
	#include <linux/kernel.h>
	#include <linux/random.h>

	#include <asm/i8259.h>
	#include <asm/irq_cpu.h>
	#include <asm/io.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>

	static DEFINE_SPINLOCK(mips_irq_lock);

	static inline int mips_pcibios_iack(void)
	{
	int irq;
	u32 dummy;

	/*
	* 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 */
	dummy = BONITO_PCIMAP_CFG;
	iob(); /* sync */

	irq = readl((u32 *)_pcictrl_bonito_pcicfg);
	iob(); /* sync */
	irq &= 0xff;
	BONITO_PCIMAP_CFG = 0;
	break;
	default:
	printk("Unknown system controller.\n");
	return -1;
	}
	return irq;
	}

	static inline int get_int(void)
	{
	unsigned long flags;
	int irq;
	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...
	*/

	spin_unlock_irqrestore(&mips_irq_lock, flags);

	return irq;
	}

	static void malta_hw0_irqdispatch(void)
	{
	int irq;

	irq = get_int();
	if (irq < 0) {
	return; /* interrupt has already been cleared */
	}

	do_IRQ(MALTA_INT_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("CoreHI interrupt, shouldn't happen, so we die here!!!\n");
	printk("epc : %08lx\nStatus: %08lx\n"
	"Cause : %08lx\nbadVaddr : %08lx\n",
	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("GT_INTRCAUSE = %08x\n", intrcause);
	printk("GT_CPUERR_ADDR = %02x%08x\n", 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("BONITO_INTISR = %08x\n", intisr);
	printk("BONITO_INTEN = %08x\n", inten);
	printk("BONITO_INTPOL = %08x\n", intpol);
	printk("BONITO_INTEDGE = %08x\n", intedge);
	printk("BONITO_INTSTEER = %08x\n", intsteer);
	printk("BONITO_PCICMD = %08x\n", pcicmd);
	printk("BONITO_PCIBADADDR = %08x\n", pcibadaddr);
	printk("BONITO_PCIMSTAT = %08x\n", pcimstat);
	break;
	}

	/* We die here*/
	die("CoreHi interrupt", regs);
	}

	static inline int clz(unsigned long x)
	{
	__asm__(
	" .set push \n"
	" .set mips32 \n"
	" clz %0, %1 \n"
	" .set pop \n"
	: "=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 (irq >= 0)
	do_IRQ(MIPS_CPU_IRQ_BASE + irq);
	else
	spurious_interrupt();
	}

	static struct irqaction i8259irq = {
	.handler = no_action,
	.name = "XT-PIC cascade"
	};

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

	msc_irqmap_t __initdata msc_irqmap[] = {
	{MSC01C_INT_TMR, MSC01_IRQ_EDGE, 0},
	{MSC01C_INT_PCI, MSC01_IRQ_LEVEL, 0},
	};
	int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);

	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}
	};
	int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);

	void __init arch_init_irq(void)
	{
	init_i8259_irqs();

	if (!cpu_has_veic)
	mips_cpu_irq_init();

	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);
	}
	}