[linux-2.6-block.git] / arch / mips / sgi-ip22 / ip22-int.c

/*
 * 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/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)
{
	unsigned long flags;

	local_irq_save(flags);
	/* 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));
	local_irq_restore(flags);
}

static unsigned int startup_local0_irq(unsigned int irq)
{
	enable_local0_irq(irq);
	return 0;		/* Never anything pending  */
}

static void disable_local0_irq(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
	local_irq_restore(flags);
}

#define shutdown_local0_irq	disable_local0_irq
#define mask_and_ack_local0_irq	disable_local0_irq

static void end_local0_irq (unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_local0_irq(irq);
}

static struct irq_chip ip22_local0_irq_type = {
	.typename	= "IP22 local 0",
	.startup	= startup_local0_irq,
	.shutdown	= shutdown_local0_irq,
	.enable		= enable_local0_irq,
	.disable	= disable_local0_irq,
	.ack		= mask_and_ack_local0_irq,
	.end		= end_local0_irq,
};

static void enable_local1_irq(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	/* 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));
	local_irq_restore(flags);
}

static unsigned int startup_local1_irq(unsigned int irq)
{
	enable_local1_irq(irq);
	return 0;		/* Never anything pending  */
}

void disable_local1_irq(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
	local_irq_restore(flags);
}

#define shutdown_local1_irq	disable_local1_irq
#define mask_and_ack_local1_irq	disable_local1_irq

static void end_local1_irq (unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_local1_irq(irq);
}

static struct irq_chip ip22_local1_irq_type = {
	.typename	= "IP22 local 1",
	.startup	= startup_local1_irq,
	.shutdown	= shutdown_local1_irq,
	.enable		= enable_local1_irq,
	.disable	= disable_local1_irq,
	.ack		= mask_and_ack_local1_irq,
	.end		= end_local1_irq,
};

static void enable_local2_irq(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
	sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
	local_irq_restore(flags);
}

static unsigned int startup_local2_irq(unsigned int irq)
{
	enable_local2_irq(irq);
	return 0;		/* Never anything pending  */
}

void disable_local2_irq(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
	if (!sgint->cmeimask0)
		sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
	local_irq_restore(flags);
}

#define shutdown_local2_irq disable_local2_irq
#define mask_and_ack_local2_irq	disable_local2_irq

static void end_local2_irq (unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_local2_irq(irq);
}

static struct irq_chip ip22_local2_irq_type = {
	.typename	= "IP22 local 2",
	.startup	= startup_local2_irq,
	.shutdown	= shutdown_local2_irq,
	.enable		= enable_local2_irq,
	.disable	= disable_local2_irq,
	.ack		= mask_and_ack_local2_irq,
	.end		= end_local2_irq,
};

static void enable_local3_irq(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
	sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
	local_irq_restore(flags);
}

static unsigned int startup_local3_irq(unsigned int irq)
{
	enable_local3_irq(irq);
	return 0;		/* Never anything pending  */
}

void disable_local3_irq(unsigned int irq)
{
	unsigned long flags;

	local_irq_save(flags);
	sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
	if (!sgint->cmeimask1)
		sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
	local_irq_restore(flags);
}

#define shutdown_local3_irq disable_local3_irq
#define mask_and_ack_local3_irq	disable_local3_irq

static void end_local3_irq (unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
		enable_local3_irq(irq);
}

static struct irq_chip ip22_local3_irq_type = {
	.typename	= "IP22 local 3",
	.startup	= startup_local3_irq,
	.shutdown	= shutdown_local3_irq,
	.enable		= enable_local3_irq,
	.disable	= disable_local3_irq,
	.ack		= mask_and_ack_local3_irq,
	.end		= end_local3_irq,
};

static void indy_local0_irqdispatch(struct pt_regs *regs)
{
	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, regs);
	return;
}

static void indy_local1_irqdispatch(struct pt_regs *regs)
{
	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, regs);
	return;
}

extern void ip22_be_interrupt(int irq, struct pt_regs *regs);

static void indy_buserror_irq(struct pt_regs *regs)
{
	int irq = SGI_BUSERR_IRQ;

	irq_enter();
	kstat_this_cpu.irqs[irq]++;
	ip22_be_interrupt(irq, regs);
	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(struct pt_regs *regs);
extern void indy_8254timer_irq(struct pt_regs *regs);

/*
 * 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(struct pt_regs *regs)
{
	unsigned int pending = read_c0_cause();

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

extern void mips_cpu_irq_init(unsigned int irq_base);

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(SGINT_CPU);

	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;

		irq_desc[i].status	= IRQ_DISABLED;
		irq_desc[i].action	= 0;
		irq_desc[i].depth	= 1;
		irq_desc[i].chip	= handler;
	}

	/* 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
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
	3	* found on INDY and Indigo2 workstations.
	4	*
	5	* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
	6	* Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
	7	* Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
	8	* - Indigo2 changes
	9	* - Interrupt handling fixes
	10	* Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
	11	*/
1da177e4 LT	12	#include <linux/types.h>
	13	#include <linux/init.h>
	14	#include <linux/kernel_stat.h>
	15	#include <linux/signal.h>
	16	#include <linux/sched.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/irq.h>
	19
	20	#include <asm/mipsregs.h>
	21	#include <asm/addrspace.h>
	22
	23	#include <asm/sgi/ioc.h>
	24	#include <asm/sgi/hpc3.h>
	25	#include <asm/sgi/ip22.h>
	26
	27	/* #define DEBUG_SGINT */
	28
	29	/* So far nothing hangs here */
42a3b4f2	30	#undef USE_LIO3_IRQ
1da177e4 LT	31
	32	struct sgint_regs *sgint;
	33
	34	static char lc0msk_to_irqnr[256];
	35	static char lc1msk_to_irqnr[256];
	36	static char lc2msk_to_irqnr[256];
	37	static char lc3msk_to_irqnr[256];
	38
1da177e4 LT	39	extern int ip22_eisa_init(void);
	40
	41	static void enable_local0_irq(unsigned int irq)
	42	{
	43	unsigned long flags;
	44
	45	local_irq_save(flags);
	46	/* don't allow mappable interrupt to be enabled from setup_irq,
	47	* we have our own way to do so */
	48	if (irq != SGI_MAP_0_IRQ)
	49	sgint->imask0 \|= (1 << (irq - SGINT_LOCAL0));
	50	local_irq_restore(flags);
	51	}
	52
	53	static unsigned int startup_local0_irq(unsigned int irq)
	54	{
	55	enable_local0_irq(irq);
	56	return 0; /* Never anything pending */
	57	}
	58
	59	static void disable_local0_irq(unsigned int irq)
	60	{
	61	unsigned long flags;
	62
	63	local_irq_save(flags);
	64	sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
	65	local_irq_restore(flags);
	66	}
	67
	68	#define shutdown_local0_irq disable_local0_irq
	69	#define mask_and_ack_local0_irq disable_local0_irq
	70
	71	static void end_local0_irq (unsigned int irq)
	72	{
	73	if (!(irq_desc[irq].status & (IRQ_DISABLED\|IRQ_INPROGRESS)))
	74	enable_local0_irq(irq);
	75	}
	76
94dee171	77	static struct irq_chip ip22_local0_irq_type = {
1da177e4 LT	78	.typename = "IP22 local 0",
	79	.startup = startup_local0_irq,
	80	.shutdown = shutdown_local0_irq,
	81	.enable = enable_local0_irq,
	82	.disable = disable_local0_irq,
	83	.ack = mask_and_ack_local0_irq,
	84	.end = end_local0_irq,
	85	};
	86
	87	static void enable_local1_irq(unsigned int irq)
	88	{
	89	unsigned long flags;
	90
	91	local_irq_save(flags);
	92	/* don't allow mappable interrupt to be enabled from setup_irq,
	93	* we have our own way to do so */
	94	if (irq != SGI_MAP_1_IRQ)
	95	sgint->imask1 \|= (1 << (irq - SGINT_LOCAL1));
	96	local_irq_restore(flags);
	97	}
	98
	99	static unsigned int startup_local1_irq(unsigned int irq)
	100	{
	101	enable_local1_irq(irq);
	102	return 0; /* Never anything pending */
	103	}
	104
	105	void disable_local1_irq(unsigned int irq)
	106	{
	107	unsigned long flags;
	108
	109	local_irq_save(flags);
	110	sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
	111	local_irq_restore(flags);
	112	}
	113
	114	#define shutdown_local1_irq disable_local1_irq
	115	#define mask_and_ack_local1_irq disable_local1_irq
	116
	117	static void end_local1_irq (unsigned int irq)
	118	{
	119	if (!(irq_desc[irq].status & (IRQ_DISABLED\|IRQ_INPROGRESS)))
	120	enable_local1_irq(irq);
	121	}
	122
94dee171	123	static struct irq_chip ip22_local1_irq_type = {
1da177e4 LT	124	.typename = "IP22 local 1",
	125	.startup = startup_local1_irq,
	126	.shutdown = shutdown_local1_irq,
	127	.enable = enable_local1_irq,
	128	.disable = disable_local1_irq,
	129	.ack = mask_and_ack_local1_irq,
	130	.end = end_local1_irq,
	131	};
	132
	133	static void enable_local2_irq(unsigned int irq)
	134	{
	135	unsigned long flags;
	136
	137	local_irq_save(flags);
	138	sgint->imask0 \|= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
	139	sgint->cmeimask0 \|= (1 << (irq - SGINT_LOCAL2));
	140	local_irq_restore(flags);
	141	}
	142
	143	static unsigned int startup_local2_irq(unsigned int irq)
	144	{
	145	enable_local2_irq(irq);
	146	return 0; /* Never anything pending */
	147	}
	148
	149	void disable_local2_irq(unsigned int irq)
	150	{
	151	unsigned long flags;
	152
	153	local_irq_save(flags);
	154	sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
	155	if (!sgint->cmeimask0)
	156	sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
	157	local_irq_restore(flags);
	158	}
	159
	160	#define shutdown_local2_irq disable_local2_irq
	161	#define mask_and_ack_local2_irq disable_local2_irq
	162
	163	static void end_local2_irq (unsigned int irq)
	164	{
	165	if (!(irq_desc[irq].status & (IRQ_DISABLED\|IRQ_INPROGRESS)))
	166	enable_local2_irq(irq);
	167	}
	168
94dee171	169	static struct irq_chip ip22_local2_irq_type = {
1da177e4 LT	170	.typename = "IP22 local 2",
	171	.startup = startup_local2_irq,
	172	.shutdown = shutdown_local2_irq,
	173	.enable = enable_local2_irq,
	174	.disable = disable_local2_irq,
	175	.ack = mask_and_ack_local2_irq,
	176	.end = end_local2_irq,
	177	};
	178
	179	static void enable_local3_irq(unsigned int irq)
	180	{
	181	unsigned long flags;
	182
	183	local_irq_save(flags);
	184	sgint->imask1 \|= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
	185	sgint->cmeimask1 \|= (1 << (irq - SGINT_LOCAL3));
	186	local_irq_restore(flags);
	187	}
	188
	189	static unsigned int startup_local3_irq(unsigned int irq)
	190	{
	191	enable_local3_irq(irq);
	192	return 0; /* Never anything pending */
	193	}
	194
	195	void disable_local3_irq(unsigned int irq)
	196	{
	197	unsigned long flags;
	198
	199	local_irq_save(flags);
	200	sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
	201	if (!sgint->cmeimask1)
	202	sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
	203	local_irq_restore(flags);
	204	}
	205
	206	#define shutdown_local3_irq disable_local3_irq
	207	#define mask_and_ack_local3_irq disable_local3_irq
	208
	209	static void end_local3_irq (unsigned int irq)
	210	{
	211	if (!(irq_desc[irq].status & (IRQ_DISABLED\|IRQ_INPROGRESS)))
	212	enable_local3_irq(irq);
	213	}
	214
94dee171	215	static struct irq_chip ip22_local3_irq_type = {
1da177e4 LT	216	.typename = "IP22 local 3",
	217	.startup = startup_local3_irq,
	218	.shutdown = shutdown_local3_irq,
	219	.enable = enable_local3_irq,
	220	.disable = disable_local3_irq,
	221	.ack = mask_and_ack_local3_irq,
	222	.end = end_local3_irq,
	223	};
	224
e4ac58af	225	static void indy_local0_irqdispatch(struct pt_regs *regs)
1da177e4 LT	226	{
	227	u8 mask = sgint->istat0 & sgint->imask0;
	228	u8 mask2;
	229	int irq;
	230
	231	if (mask & SGINT_ISTAT0_LIO2) {
	232	mask2 = sgint->vmeistat & sgint->cmeimask0;
	233	irq = lc2msk_to_irqnr[mask2];
	234	} else
	235	irq = lc0msk_to_irqnr[mask];
	236
	237	/* if irq == 0, then the interrupt has already been cleared */
	238	if (irq)
	239	do_IRQ(irq, regs);
	240	return;
	241	}
	242
e4ac58af	243	static void indy_local1_irqdispatch(struct pt_regs *regs)
1da177e4 LT	244	{
	245	u8 mask = sgint->istat1 & sgint->imask1;
	246	u8 mask2;
	247	int irq;
	248
	249	if (mask & SGINT_ISTAT1_LIO3) {
	250	mask2 = sgint->vmeistat & sgint->cmeimask1;
	251	irq = lc3msk_to_irqnr[mask2];
	252	} else
	253	irq = lc1msk_to_irqnr[mask];
	254
	255	/* if irq == 0, then the interrupt has already been cleared */
	256	if (irq)
	257	do_IRQ(irq, regs);
	258	return;
	259	}
	260
	261	extern void ip22_be_interrupt(int irq, struct pt_regs *regs);
	262
e4ac58af	263	static void indy_buserror_irq(struct pt_regs *regs)
1da177e4 LT	264	{
	265	int irq = SGI_BUSERR_IRQ;
	266
	267	irq_enter();
	268	kstat_this_cpu.irqs[irq]++;
	269	ip22_be_interrupt(irq, regs);
	270	irq_exit();
	271	}
	272
42a3b4f2	273	static struct irqaction local0_cascade = {
1da177e4	274	.handler = no_action,
f40298fd	275	.flags = IRQF_DISABLED,
1da177e4 LT	276	.name = "local0 cascade",
	277	};
	278
42a3b4f2	279	static struct irqaction local1_cascade = {
1da177e4	280	.handler = no_action,
f40298fd	281	.flags = IRQF_DISABLED,
1da177e4 LT	282	.name = "local1 cascade",
	283	};
	284
42a3b4f2	285	static struct irqaction buserr = {
1da177e4	286	.handler = no_action,
f40298fd	287	.flags = IRQF_DISABLED,
1da177e4 LT	288	.name = "Bus Error",
	289	};
	290
42a3b4f2	291	static struct irqaction map0_cascade = {
1da177e4	292	.handler = no_action,
f40298fd	293	.flags = IRQF_DISABLED,
1da177e4 LT	294	.name = "mapable0 cascade",
	295	};
	296
	297	#ifdef USE_LIO3_IRQ
42a3b4f2	298	static struct irqaction map1_cascade = {
1da177e4	299	.handler = no_action,
f40298fd	300	.flags = IRQF_DISABLED,
1da177e4 LT	301	.name = "mapable1 cascade",
	302	};
	303	#define SGI_INTERRUPTS SGINT_END
	304	#else
	305	#define SGI_INTERRUPTS SGINT_LOCAL3
	306	#endif
	307
e4ac58af RB	308	extern void indy_r4k_timer_interrupt(struct pt_regs *regs);
	309	extern void indy_8254timer_irq(struct pt_regs *regs);
	310
	311	/*
	312	* IRQs on the INDY look basically (barring software IRQs which we don't use
	313	* at all) like:
	314	*
	315	* MIPS IRQ Source
	316	* -------- ------
	317	* 0 Software (ignored)
	318	* 1 Software (ignored)
	319	* 2 Local IRQ level zero
	320	* 3 Local IRQ level one
	321	* 4 8254 Timer zero
	322	* 5 8254 Timer one
	323	* 6 Bus Error
	324	* 7 R4k timer (what we use)
	325	*
	326	* We handle the IRQ according to _our_ priority which is:
	327	*
	328	* Highest ---- R4k Timer
	329	* Local IRQ zero
	330	* Local IRQ one
	331	* Bus Error
	332	* 8254 Timer zero
	333	* Lowest ---- 8254 Timer one
	334	*
	335	* then we just return, if multiple IRQs are pending then we will just take
	336	* another exception, big deal.
	337	*/
	338
	339	asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
	340	{
	341	unsigned int pending = read_c0_cause();
	342
	343	/*
	344	* First we check for r4k counter/timer IRQ.
	345	*/
	346	if (pending & CAUSEF_IP7)
	347	indy_r4k_timer_interrupt(regs);
	348	else if (pending & CAUSEF_IP2)
	349	indy_local0_irqdispatch(regs);
	350	else if (pending & CAUSEF_IP3)
	351	indy_local1_irqdispatch(regs);
	352	else if (pending & CAUSEF_IP6)
	353	indy_buserror_irq(regs);
	354	else if (pending & (CAUSEF_IP4 \| CAUSEF_IP5))
	355	indy_8254timer_irq(regs);
	356	}
	357
1da177e4 LT	358	extern void mips_cpu_irq_init(unsigned int irq_base);
	359
	360	void __init arch_init_irq(void)
	361	{
	362	int i;
	363
	364	/* Init local mask --> irq tables. */
	365	for (i = 0; i < 256; i++) {
	366	if (i & 0x80) {
	367	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
	368	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
	369	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
	370	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
	371	} else if (i & 0x40) {
	372	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
	373	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
	374	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
	375	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
	376	} else if (i & 0x20) {
	377	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
	378	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
	379	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
	380	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
	381	} else if (i & 0x10) {
	382	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
	383	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
	384	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
	385	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
	386	} else if (i & 0x08) {
	387	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
	388	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
	389	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
	390	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
	391	} else if (i & 0x04) {
	392	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
	393	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
	394	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
	395	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
	396	} else if (i & 0x02) {
	397	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
	398	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
	399	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
	400	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
	401	} else if (i & 0x01) {
	402	lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
	403	lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
	404	lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
	405	lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
	406	} else {
	407	lc0msk_to_irqnr[i] = 0;
	408	lc1msk_to_irqnr[i] = 0;
	409	lc2msk_to_irqnr[i] = 0;
	410	lc3msk_to_irqnr[i] = 0;
	411	}
	412	}
	413
	414	/* Mask out all interrupts. */
	415	sgint->imask0 = 0;
	416	sgint->imask1 = 0;
	417	sgint->cmeimask0 = 0;
	418	sgint->cmeimask1 = 0;
	419
1da177e4 LT	420	/* init CPU irqs */
	421	mips_cpu_irq_init(SGINT_CPU);
	422
	423	for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
94dee171	424	struct irq_chip *handler;
1da177e4 LT	425
	426	if (i < SGINT_LOCAL1)
	427	handler = &ip22_local0_irq_type;
	428	else if (i < SGINT_LOCAL2)
	429	handler = &ip22_local1_irq_type;
	430	else if (i < SGINT_LOCAL3)
	431	handler = &ip22_local2_irq_type;
	432	else
	433	handler = &ip22_local3_irq_type;
	434
	435	irq_desc[i].status = IRQ_DISABLED;
	436	irq_desc[i].action = 0;
	437	irq_desc[i].depth = 1;
d1bef4ed	438	irq_desc[i].chip = handler;
1da177e4 LT	439	}
	440
	441	/* vector handler. this register the IRQ as non-sharable */
	442	setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
	443	setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
	444	setup_irq(SGI_BUSERR_IRQ, &buserr);
	445
	446	/* cascade in cascade. i love Indy ;-) */
	447	setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
	448	#ifdef USE_LIO3_IRQ
	449	setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
	450	#endif
	451
	452	#ifdef CONFIG_EISA
	453	if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */
	454	ip22_eisa_init ();
	455	#endif
	456	}