arch/mips/sgi-ip22/ip22-int.c - kernel/msm-4.19 - Gitiles

 /*
  * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
  *             found on INDY and Indigo2 workstations.
  *
  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
  * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
  * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
  *                    - Indigo2 changes
  *                    - Interrupt handling fixes
  * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
  */
 #include <linux/types.h>
 #include <linux/init.h>
 #include <linux/kernel_stat.h>
 #include <linux/signal.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>

 #include <asm/mipsregs.h>
 #include <asm/addrspace.h>
 #include <asm/irq_cpu.h>

 #include <asm/sgi/ioc.h>
 #include <asm/sgi/hpc3.h>
 #include <asm/sgi/ip22.h>

 /* #define DEBUG_SGINT */

 /* So far nothing hangs here */
 #undef USE_LIO3_IRQ

 struct sgint_regs *sgint;

 static char lc0msk_to_irqnr[256];
 static char lc1msk_to_irqnr[256];
 static char lc2msk_to_irqnr[256];
 static char lc3msk_to_irqnr[256];

 extern int ip22_eisa_init(void);

 static void enable_local0_irq(unsigned int irq)
 {
 	/* don't allow mappable interrupt to be enabled from setup_irq,
 	 * we have our own way to do so */
 	if (irq != SGI_MAP_0_IRQ)
 		sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
 }

 static void disable_local0_irq(unsigned int irq)
 {
 	sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
 }

 static struct irq_chip ip22_local0_irq_type = {
 	.typename	= "IP22 local 0",
 	.ack		= disable_local0_irq,
 	.mask		= disable_local0_irq,
 	.mask_ack	= disable_local0_irq,
 	.unmask		= enable_local0_irq,
 };

 static void enable_local1_irq(unsigned int irq)
 {
 	/* don't allow mappable interrupt to be enabled from setup_irq,
 	 * we have our own way to do so */
 	if (irq != SGI_MAP_1_IRQ)
 		sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
 }

 void disable_local1_irq(unsigned int irq)
 {
 	sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
 }

 static struct irq_chip ip22_local1_irq_type = {
 	.typename	= "IP22 local 1",
 	.ack		= disable_local1_irq,
 	.mask		= disable_local1_irq,
 	.mask_ack	= disable_local1_irq,
 	.unmask		= enable_local1_irq,
 };

 static void enable_local2_irq(unsigned int irq)
 {
 	sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
 	sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
 }

 void disable_local2_irq(unsigned int irq)
 {
 	sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
 	if (!sgint->cmeimask0)
 		sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
 }

 static struct irq_chip ip22_local2_irq_type = {
 	.typename	= "IP22 local 2",
 	.ack		= disable_local2_irq,
 	.mask		= disable_local2_irq,
 	.mask_ack	= disable_local2_irq,
 	.unmask		= enable_local2_irq,
 };

 static void enable_local3_irq(unsigned int irq)
 {
 	sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
 	sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
 }

 void disable_local3_irq(unsigned int irq)
 {
 	sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
 	if (!sgint->cmeimask1)
 		sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
 }

 static struct irq_chip ip22_local3_irq_type = {
 	.typename	= "IP22 local 3",
 	.ack		= disable_local3_irq,
 	.mask		= disable_local3_irq,
 	.mask_ack	= disable_local3_irq,
 	.unmask		= enable_local3_irq,
 };

 static void indy_local0_irqdispatch(void)
 {
 	u8 mask = sgint->istat0 & sgint->imask0;
 	u8 mask2;
 	int irq;

 	if (mask & SGINT_ISTAT0_LIO2) {
 		mask2 = sgint->vmeistat & sgint->cmeimask0;
 		irq = lc2msk_to_irqnr[mask2];
 	} else
 		irq = lc0msk_to_irqnr[mask];

 	/* if irq == 0, then the interrupt has already been cleared */
 	if (irq)
 		do_IRQ(irq);
 }

 static void indy_local1_irqdispatch(void)
 {
 	u8 mask = sgint->istat1 & sgint->imask1;
 	u8 mask2;
 	int irq;

 	if (mask & SGINT_ISTAT1_LIO3) {
 		mask2 = sgint->vmeistat & sgint->cmeimask1;
 		irq = lc3msk_to_irqnr[mask2];
 	} else
 		irq = lc1msk_to_irqnr[mask];

 	/* if irq == 0, then the interrupt has already been cleared */
 	if (irq)
 		do_IRQ(irq);
 }

 extern void ip22_be_interrupt(int irq);

 static void indy_buserror_irq(void)
 {
 	int irq = SGI_BUSERR_IRQ;

 	irq_enter();
 	kstat_this_cpu.irqs[irq]++;
 	ip22_be_interrupt(irq);
 	irq_exit();
 }

 static struct irqaction local0_cascade = {
 	.handler	= no_action,
 	.flags		= IRQF_DISABLED,
 	.name		= "local0 cascade",
 };

 static struct irqaction local1_cascade = {
 	.handler	= no_action,
 	.flags		= IRQF_DISABLED,
 	.name		= "local1 cascade",
 };

 static struct irqaction buserr = {
 	.handler	= no_action,
 	.flags		= IRQF_DISABLED,
 	.name		= "Bus Error",
 };

 static struct irqaction map0_cascade = {
 	.handler	= no_action,
 	.flags		= IRQF_DISABLED,
 	.name		= "mapable0 cascade",
 };

 #ifdef USE_LIO3_IRQ
 static struct irqaction map1_cascade = {
 	.handler	= no_action,
 	.flags		= IRQF_DISABLED,
 	.name		= "mapable1 cascade",
 };
 #define SGI_INTERRUPTS	SGINT_END
 #else
 #define SGI_INTERRUPTS	SGINT_LOCAL3
 #endif

 extern void indy_r4k_timer_interrupt(void);
 extern void indy_8254timer_irq(void);

 /*
  * IRQs on the INDY look basically (barring software IRQs which we don't use
  * at all) like:
  *
  *	MIPS IRQ	Source
  *      --------        ------
  *             0	Software (ignored)
  *             1        Software (ignored)
  *             2        Local IRQ level zero
  *             3        Local IRQ level one
  *             4        8254 Timer zero
  *             5        8254 Timer one
  *             6        Bus Error
  *             7        R4k timer (what we use)
  *
  * We handle the IRQ according to _our_ priority which is:
  *
  * Highest ----     R4k Timer
  *                  Local IRQ zero
  *                  Local IRQ one
  *                  Bus Error
  *                  8254 Timer zero
  * Lowest  ----     8254 Timer one
  *
  * 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();

 	/*
 	 * First we check for r4k counter/timer IRQ.
 	 */
 	if (pending & CAUSEF_IP7)
 		indy_r4k_timer_interrupt();
 	else if (pending & CAUSEF_IP2)
 		indy_local0_irqdispatch();
 	else if (pending & CAUSEF_IP3)
 		indy_local1_irqdispatch();
 	else if (pending & CAUSEF_IP6)
 		indy_buserror_irq();
 	else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
 		indy_8254timer_irq();
 }

 void __init arch_init_irq(void)
 {
 	int i;

 	/* Init local mask --> irq tables. */
 	for (i = 0; i < 256; i++) {
 		if (i & 0x80) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
 		} else if (i & 0x40) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
 		} else if (i & 0x20) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
 		} else if (i & 0x10) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
 		} else if (i & 0x08) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
 		} else if (i & 0x04) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
 		} else if (i & 0x02) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
 		} else if (i & 0x01) {
 			lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
 			lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
 			lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
 			lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
 		} else {
 			lc0msk_to_irqnr[i] = 0;
 			lc1msk_to_irqnr[i] = 0;
 			lc2msk_to_irqnr[i] = 0;
 			lc3msk_to_irqnr[i] = 0;
 		}
 	}

 	/* Mask out all interrupts. */
 	sgint->imask0 = 0;
 	sgint->imask1 = 0;
 	sgint->cmeimask0 = 0;
 	sgint->cmeimask1 = 0;

 	/* init CPU irqs */
 	mips_cpu_irq_init();

 	for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
 		struct irq_chip *handler;

 		if (i < SGINT_LOCAL1)
 			handler		= &ip22_local0_irq_type;
 		else if (i < SGINT_LOCAL2)
 			handler		= &ip22_local1_irq_type;
 		else if (i < SGINT_LOCAL3)
 			handler		= &ip22_local2_irq_type;
 		else
 			handler		= &ip22_local3_irq_type;

 		set_irq_chip_and_handler(i, handler, handle_level_irq);
 	}

 	/* vector handler. this register the IRQ as non-sharable */
 	setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
 	setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
 	setup_irq(SGI_BUSERR_IRQ, &buserr);

 	/* cascade in cascade. i love Indy ;-) */
 	setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
 #ifdef USE_LIO3_IRQ
 	setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
 #endif

 #ifdef CONFIG_EISA
 	if (ip22_is_fullhouse())	/* Only Indigo-2 has EISA stuff */
 	        ip22_eisa_init ();
 #endif
 }
	/*
	* ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
	* found on INDY and Indigo2 workstations.
	*
	* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
	* Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
	* Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
	* - Indigo2 changes
	* - Interrupt handling fixes
	* Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
	*/
	#include <linux/types.h>
	#include <linux/init.h>
	#include <linux/kernel_stat.h>
	#include <linux/signal.h>
	#include <linux/sched.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>

	#include <asm/mipsregs.h>
	#include <asm/addrspace.h>
	#include <asm/irq_cpu.h>

	#include <asm/sgi/ioc.h>
	#include <asm/sgi/hpc3.h>
	#include <asm/sgi/ip22.h>

	/* #define DEBUG_SGINT */

	/* So far nothing hangs here */
	#undef USE_LIO3_IRQ

	struct sgint_regs *sgint;

	static char lc0msk_to_irqnr[256];
	static char lc1msk_to_irqnr[256];
	static char lc2msk_to_irqnr[256];
	static char lc3msk_to_irqnr[256];

	extern int ip22_eisa_init(void);

	static void enable_local0_irq(unsigned int irq)
	{
	/* don't allow mappable interrupt to be enabled from setup_irq,
	* we have our own way to do so */
	if (irq != SGI_MAP_0_IRQ)
	sgint->imask0 \|= (1 << (irq - SGINT_LOCAL0));
	}

	static void disable_local0_irq(unsigned int irq)
	{
	sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
	}

	static struct irq_chip ip22_local0_irq_type = {
	.typename = "IP22 local 0",
	.ack = disable_local0_irq,
	.mask = disable_local0_irq,
	.mask_ack = disable_local0_irq,
	.unmask = enable_local0_irq,
	};

	static void enable_local1_irq(unsigned int irq)
	{
	/* don't allow mappable interrupt to be enabled from setup_irq,
	* we have our own way to do so */
	if (irq != SGI_MAP_1_IRQ)
	sgint->imask1 \|= (1 << (irq - SGINT_LOCAL1));
	}

	void disable_local1_irq(unsigned int irq)
	{
	sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
	}

	static struct irq_chip ip22_local1_irq_type = {
	.typename = "IP22 local 1",
	.ack = disable_local1_irq,
	.mask = disable_local1_irq,
	.mask_ack = disable_local1_irq,
	.unmask = enable_local1_irq,
	};

	static void enable_local2_irq(unsigned int irq)
	{
	sgint->imask0 \|= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
	sgint->cmeimask0 \|= (1 << (irq - SGINT_LOCAL2));
	}

	void disable_local2_irq(unsigned int irq)
	{
	sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
	if (!sgint->cmeimask0)
	sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
	}

	static struct irq_chip ip22_local2_irq_type = {
	.typename = "IP22 local 2",
	.ack = disable_local2_irq,
	.mask = disable_local2_irq,
	.mask_ack = disable_local2_irq,
	.unmask = enable_local2_irq,
	};

	static void enable_local3_irq(unsigned int irq)
	{
	sgint->imask1 \|= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
	sgint->cmeimask1 \|= (1 << (irq - SGINT_LOCAL3));
	}

	void disable_local3_irq(unsigned int irq)
	{
	sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
	if (!sgint->cmeimask1)
	sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
	}

	static struct irq_chip ip22_local3_irq_type = {
	.typename = "IP22 local 3",
	.ack = disable_local3_irq,
	.mask = disable_local3_irq,
	.mask_ack = disable_local3_irq,
	.unmask = enable_local3_irq,
	};

	static void indy_local0_irqdispatch(void)
	{
	u8 mask = sgint->istat0 & sgint->imask0;
	u8 mask2;
	int irq;

	if (mask & SGINT_ISTAT0_LIO2) {
	mask2 = sgint->vmeistat & sgint->cmeimask0;
	irq = lc2msk_to_irqnr[mask2];
	} else
	irq = lc0msk_to_irqnr[mask];

	/* if irq == 0, then the interrupt has already been cleared */
	if (irq)
	do_IRQ(irq);
	}

	static void indy_local1_irqdispatch(void)
	{
	u8 mask = sgint->istat1 & sgint->imask1;
	u8 mask2;
	int irq;

	if (mask & SGINT_ISTAT1_LIO3) {
	mask2 = sgint->vmeistat & sgint->cmeimask1;
	irq = lc3msk_to_irqnr[mask2];
	} else
	irq = lc1msk_to_irqnr[mask];

	/* if irq == 0, then the interrupt has already been cleared */
	if (irq)
	do_IRQ(irq);
	}

	extern void ip22_be_interrupt(int irq);

	static void indy_buserror_irq(void)
	{
	int irq = SGI_BUSERR_IRQ;

	irq_enter();
	kstat_this_cpu.irqs[irq]++;
	ip22_be_interrupt(irq);
	irq_exit();
	}

	static struct irqaction local0_cascade = {
	.handler = no_action,
	.flags = IRQF_DISABLED,
	.name = "local0 cascade",
	};

	static struct irqaction local1_cascade = {
	.handler = no_action,
	.flags = IRQF_DISABLED,
	.name = "local1 cascade",
	};

	static struct irqaction buserr = {
	.handler = no_action,
	.flags = IRQF_DISABLED,
	.name = "Bus Error",
	};

	static struct irqaction map0_cascade = {
	.handler = no_action,
	.flags = IRQF_DISABLED,
	.name = "mapable0 cascade",
	};

	#ifdef USE_LIO3_IRQ
	static struct irqaction map1_cascade = {
	.handler = no_action,
	.flags = IRQF_DISABLED,
	.name = "mapable1 cascade",
	};
	#define SGI_INTERRUPTS SGINT_END
	#else
	#define SGI_INTERRUPTS SGINT_LOCAL3
	#endif

	extern void indy_r4k_timer_interrupt(void);
	extern void indy_8254timer_irq(void);

	/*
	* IRQs on the INDY look basically (barring software IRQs which we don't use
	* at all) like:
	*
	* MIPS IRQ Source
	* -------- ------
	* 0 Software (ignored)
	* 1 Software (ignored)
	* 2 Local IRQ level zero
	* 3 Local IRQ level one
	* 4 8254 Timer zero
	* 5 8254 Timer one
	* 6 Bus Error
	* 7 R4k timer (what we use)
	*
	* We handle the IRQ according to _our_ priority which is:
	*
	* Highest ---- R4k Timer
	* Local IRQ zero
	* Local IRQ one
	* Bus Error
	* 8254 Timer zero
	* Lowest ---- 8254 Timer one
	*
	* 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();

	/*
	* First we check for r4k counter/timer IRQ.
	*/
	if (pending & CAUSEF_IP7)
	indy_r4k_timer_interrupt();
	else if (pending & CAUSEF_IP2)
	indy_local0_irqdispatch();
	else if (pending & CAUSEF_IP3)
	indy_local1_irqdispatch();
	else if (pending & CAUSEF_IP6)
	indy_buserror_irq();
	else if (pending & (CAUSEF_IP4 \| CAUSEF_IP5))
	indy_8254timer_irq();
	}

	void __init arch_init_irq(void)
	{
	int i;

	/* Init local mask --> irq tables. */
	for (i = 0; i < 256; i++) {
	if (i & 0x80) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
	} else if (i & 0x40) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
	} else if (i & 0x20) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
	} else if (i & 0x10) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
	} else if (i & 0x08) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
	} else if (i & 0x04) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
	} else if (i & 0x02) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
	} else if (i & 0x01) {
	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
	} else {
	lc0msk_to_irqnr[i] = 0;
	lc1msk_to_irqnr[i] = 0;
	lc2msk_to_irqnr[i] = 0;
	lc3msk_to_irqnr[i] = 0;
	}
	}

	/* Mask out all interrupts. */
	sgint->imask0 = 0;
	sgint->imask1 = 0;
	sgint->cmeimask0 = 0;
	sgint->cmeimask1 = 0;

	/* init CPU irqs */
	mips_cpu_irq_init();

	for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
	struct irq_chip *handler;

	if (i < SGINT_LOCAL1)
	handler = &ip22_local0_irq_type;
	else if (i < SGINT_LOCAL2)
	handler = &ip22_local1_irq_type;
	else if (i < SGINT_LOCAL3)
	handler = &ip22_local2_irq_type;
	else
	handler = &ip22_local3_irq_type;

	set_irq_chip_and_handler(i, handler, handle_level_irq);
	}

	/* vector handler. this register the IRQ as non-sharable */
	setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
	setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
	setup_irq(SGI_BUSERR_IRQ, &buserr);

	/* cascade in cascade. i love Indy ;-) */
	setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
	#ifdef USE_LIO3_IRQ
	setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
	#endif

	#ifdef CONFIG_EISA
	if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */
	ip22_eisa_init ();
	#endif
	}