[mirror_ubuntu-hirsute-kernel.git] / arch / mips / mips-boards / malta / malta_int.c

/*
 * 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/io.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/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(KERN_WARNING "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) {
		/* interrupt has already been cleared */
		return;
	}

	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(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!\n");
	printk(KERN_EMERG "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(KERN_EMERG "GT_INTRCAUSE = %08x\n", intrcause);
		printk(KERN_EMERG "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(KERN_EMERG "BONITO_INTISR = %08x\n", intisr);
		printk(KERN_EMERG "BONITO_INTEN = %08x\n", inten);
		printk(KERN_EMERG "BONITO_INTPOL = %08x\n", intpol);
		printk(KERN_EMERG "BONITO_INTEDGE = %08x\n", intedge);
		printk(KERN_EMERG "BONITO_INTSTEER = %08x\n", intsteer);
		printk(KERN_EMERG "BONITO_PCICMD = %08x\n", pcicmd);
		printk(KERN_EMERG "BONITO_PCIBADADDR = %08x\n", pcibadaddr);
		printk(KERN_EMERG "BONITO_PCIMSTAT = %08x\n", pcimstat);
		break;
	}

	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);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Carsten Langgaard, carstenl@mips.com
	3	* Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
	4	* Copyright (C) 2001 Ralf Baechle
	5	*
	6	* This program is free software; you can distribute it and/or modify it
	7	* under the terms of the GNU General Public License (Version 2) as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	13	* for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; if not, write to the Free Software Foundation, Inc.,
	17	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	18	*
	19	* Routines for generic manipulation of the interrupts found on the MIPS
	20	* Malta board.
	21	* The interrupt controller is located in the South Bridge a PIIX4 device
	22	* with two internal 82C95 interrupt controllers.
	23	*/
	24	#include <linux/init.h>
	25	#include <linux/irq.h>
	26	#include <linux/sched.h>
	27	#include <linux/slab.h>
	28	#include <linux/interrupt.h>
54bf038e	29	#include <linux/io.h>
1da177e4	30	#include <linux/kernel_stat.h>
25b8ac3b	31	#include <linux/kernel.h>
1da177e4 LT	32	#include <linux/random.h>
	33
	34	#include <asm/i8259.h>
e01402b1	35	#include <asm/irq_cpu.h>
ba38cdf9	36	#include <asm/irq_regs.h>
1da177e4 LT	37	#include <asm/mips-boards/malta.h>
	38	#include <asm/mips-boards/maltaint.h>
	39	#include <asm/mips-boards/piix4.h>
	40	#include <asm/gt64120.h>
	41	#include <asm/mips-boards/generic.h>
	42	#include <asm/mips-boards/msc01_pci.h>
e01402b1	43	#include <asm/msc01_ic.h>
1da177e4	44
1da177e4 LT	45	static DEFINE_SPINLOCK(mips_irq_lock);
	46
	47	static inline int mips_pcibios_iack(void)
	48	{
	49	int irq;
af825586	50	u32 dummy;
1da177e4 LT	51
	52	/*
	53	* Determine highest priority pending interrupt by performing
	54	* a PCI Interrupt Acknowledge cycle.
	55	*/
b72c0526 CD	56	switch (mips_revision_sconid) {
	57	case MIPS_REVISION_SCON_SOCIT:
	58	case MIPS_REVISION_SCON_ROCIT:
	59	case MIPS_REVISION_SCON_SOCITSC:
	60	case MIPS_REVISION_SCON_SOCITSCP:
af825586	61	MSC_READ(MSC01_PCI_IACK, irq);
1da177e4 LT	62	irq &= 0xff;
1da177e4 LT	63	break;
b72c0526	64	case MIPS_REVISION_SCON_GT64120:
1da177e4 LT	65	irq = GT_READ(GT_PCI0_IACK_OFS);
	66	irq &= 0xff;
	67	break;
b72c0526	68	case MIPS_REVISION_SCON_BONITO:
1da177e4 LT	69	/* The following will generate a PCI IACK cycle on the
	70	* Bonito controller. It's a little bit kludgy, but it
	71	* was the easiest way to implement it in hardware at
	72	* the given time.
	73	*/
	74	BONITO_PCIMAP_CFG = 0x20000;
	75
	76	/* Flush Bonito register block */
	77	dummy = BONITO_PCIMAP_CFG;
	78	iob(); /* sync */
	79
f1974653	80	irq = readl((u32 *)_pcictrl_bonito_pcicfg);
1da177e4 LT	81	iob(); /* sync */
	82	irq &= 0xff;
	83	BONITO_PCIMAP_CFG = 0;
	84	break;
	85	default:
8216d348	86	printk(KERN_WARNING "Unknown system controller.\n");
1da177e4 LT	87	return -1;
	88	}
	89	return irq;
	90	}
	91
e01402b1	92	static inline int get_int(void)
1da177e4 LT	93	{
1da177e4 LT	94	unsigned long flags;
e01402b1	95	int irq;
1da177e4 LT	96	spin_lock_irqsave(&mips_irq_lock, flags);
1da177e4 LT	97
e01402b1	98	irq = mips_pcibios_iack();
1da177e4 LT	99
1da177e4 LT	100	/*
479a0e3e RB	101	* The only way we can decide if an interrupt is spurious
	102	* is by checking the 8259 registers. This needs a spinlock
	103	* on an SMP system, so leave it up to the generic code...
1da177e4	104	*/
1da177e4 LT	105
	106	spin_unlock_irqrestore(&mips_irq_lock, flags);
	107
e01402b1	108	return irq;
1da177e4 LT	109	}
1da177e4 LT	110
937a8015	111	static void malta_hw0_irqdispatch(void)
1da177e4 LT	112	{
	113	int irq;
	114
e01402b1	115	irq = get_int();
41c594ab	116	if (irq < 0) {
cd80d548 DV	117	/* interrupt has already been cleared */
cd80d548 DV	118	return;
41c594ab	119	}
1da177e4	120
937a8015	121	do_IRQ(MALTA_INT_BASE + irq);
1da177e4 LT	122	}
1da177e4 LT	123
937a8015	124	static void corehi_irqdispatch(void)
1da177e4	125	{
937a8015	126	unsigned int intedge, intsteer, pcicmd, pcibadaddr;
af825586	127	unsigned int pcimstat, intisr, inten, intpol;
21a151d8	128	unsigned int intrcause, datalo, datahi;
ba38cdf9	129	struct pt_regs *regs = get_irq_regs();
1da177e4	130
8216d348 DV	131	printk(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!\n");
8216d348 DV	132	printk(KERN_EMERG "epc : %08lx\nStatus: %08lx\n"
af825586 DV	133	"Cause : %08lx\nbadVaddr : %08lx\n",
	134	regs->cp0_epc, regs->cp0_status,
	135	regs->cp0_cause, regs->cp0_badvaddr);
e01402b1 RB	136
	137	/* Read all the registers and then print them as there is a
	138	problem with interspersed printk's upsetting the Bonito controller.
	139	Do it for the others too.
	140	*/
	141
b72c0526	142	switch (mips_revision_sconid) {
af825586	143	case MIPS_REVISION_SCON_SOCIT:
b72c0526 CD	144	case MIPS_REVISION_SCON_ROCIT:
	145	case MIPS_REVISION_SCON_SOCITSC:
	146	case MIPS_REVISION_SCON_SOCITSCP:
af825586 DV	147	ll_msc_irq();
	148	break;
	149	case MIPS_REVISION_SCON_GT64120:
	150	intrcause = GT_READ(GT_INTRCAUSE_OFS);
	151	datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
	152	datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
8216d348 DV	153	printk(KERN_EMERG "GT_INTRCAUSE = %08x\n", intrcause);
	154	printk(KERN_EMERG "GT_CPUERR_ADDR = %02x%08x\n",
	155	datahi, datalo);
af825586 DV	156	break;
	157	case MIPS_REVISION_SCON_BONITO:
	158	pcibadaddr = BONITO_PCIBADADDR;
	159	pcimstat = BONITO_PCIMSTAT;
	160	intisr = BONITO_INTISR;
	161	inten = BONITO_INTEN;
	162	intpol = BONITO_INTPOL;
	163	intedge = BONITO_INTEDGE;
	164	intsteer = BONITO_INTSTEER;
	165	pcicmd = BONITO_PCICMD;
8216d348 DV	166	printk(KERN_EMERG "BONITO_INTISR = %08x\n", intisr);
	167	printk(KERN_EMERG "BONITO_INTEN = %08x\n", inten);
	168	printk(KERN_EMERG "BONITO_INTPOL = %08x\n", intpol);
	169	printk(KERN_EMERG "BONITO_INTEDGE = %08x\n", intedge);
	170	printk(KERN_EMERG "BONITO_INTSTEER = %08x\n", intsteer);
	171	printk(KERN_EMERG "BONITO_PCICMD = %08x\n", pcicmd);
	172	printk(KERN_EMERG "BONITO_PCIBADADDR = %08x\n", pcibadaddr);
	173	printk(KERN_EMERG "BONITO_PCIMSTAT = %08x\n", pcimstat);
af825586 DV	174	break;
af825586 DV	175	}
1da177e4	176
af825586	177	die("CoreHi interrupt", regs);
1da177e4 LT	178	}
1da177e4 LT	179
e4ac58af RB	180	static inline int clz(unsigned long x)
e4ac58af RB	181	{
49a89efb	182	__asm__(
e4ac58af RB	183	" .set push \n"
	184	" .set mips32 \n"
	185	" clz %0, %1 \n"
	186	" .set pop \n"
	187	: "=r" (x)
	188	: "r" (x));
	189
	190	return x;
	191	}
	192
	193	/*
	194	* Version of ffs that only looks at bits 12..15.
	195	*/
	196	static inline unsigned int irq_ffs(unsigned int pending)
	197	{
	198	#if defined(CONFIG_CPU_MIPS32) \|\| defined(CONFIG_CPU_MIPS64)
	199	return -clz(pending) + 31 - CAUSEB_IP;
	200	#else
	201	unsigned int a0 = 7;
	202	unsigned int t0;
	203
0118c3ca	204	t0 = pending & 0xf000;
e4ac58af RB	205	t0 = t0 < 1;
	206	t0 = t0 << 2;
	207	a0 = a0 - t0;
0118c3ca	208	pending = pending << t0;
e4ac58af	209
0118c3ca	210	t0 = pending & 0xc000;
e4ac58af RB	211	t0 = t0 < 1;
	212	t0 = t0 << 1;
	213	a0 = a0 - t0;
0118c3ca	214	pending = pending << t0;
e4ac58af	215
0118c3ca	216	t0 = pending & 0x8000;
e4ac58af	217	t0 = t0 < 1;
ae9cef0b	218	/* t0 = t0 << 2; */
e4ac58af	219	a0 = a0 - t0;
ae9cef0b	220	/* pending = pending << t0; */
e4ac58af RB	221
	222	return a0;
	223	#endif
	224	}
	225
	226	/*
	227	* IRQs on the Malta board look basically (barring software IRQs which we
	228	* don't use at all and all external interrupt sources are combined together
	229	* on hardware interrupt 0 (MIPS IRQ 2)) like:
	230	*
	231	* MIPS IRQ Source
	232	* -------- ------
	233	* 0 Software (ignored)
	234	* 1 Software (ignored)
	235	* 2 Combined hardware interrupt (hw0)
	236	* 3 Hardware (ignored)
	237	* 4 Hardware (ignored)
	238	* 5 Hardware (ignored)
	239	* 6 Hardware (ignored)
	240	* 7 R4k timer (what we use)
	241	*
	242	* We handle the IRQ according to _our_ priority which is:
	243	*
	244	* Highest ---- R4k Timer
	245	* Lowest ---- Combined hardware interrupt
	246	*
	247	* then we just return, if multiple IRQs are pending then we will just take
	248	* another exception, big deal.
	249	*/
	250
937a8015	251	asmlinkage void plat_irq_dispatch(void)
e4ac58af RB	252	{
	253	unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
	254	int irq;
	255
	256	irq = irq_ffs(pending);
	257
	258	if (irq == MIPSCPU_INT_I8259A)
937a8015	259	malta_hw0_irqdispatch();
48d480b0	260	else if (irq >= 0)
3b1d4ed5	261	do_IRQ(MIPS_CPU_IRQ_BASE + irq);
e4ac58af	262	else
937a8015	263	spurious_interrupt();
e4ac58af RB	264	}
e4ac58af RB	265
e01402b1 RB	266	static struct irqaction i8259irq = {
	267	.handler = no_action,
	268	.name = "XT-PIC cascade"
	269	};
	270
	271	static struct irqaction corehi_irqaction = {
	272	.handler = no_action,
	273	.name = "CoreHi"
	274	};
	275
	276	msc_irqmap_t __initdata msc_irqmap[] = {
	277	{MSC01C_INT_TMR, MSC01_IRQ_EDGE, 0},
	278	{MSC01C_INT_PCI, MSC01_IRQ_LEVEL, 0},
	279	};
25b8ac3b	280	int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);
e01402b1 RB	281
	282	msc_irqmap_t __initdata msc_eicirqmap[] = {
	283	{MSC01E_INT_SW0, MSC01_IRQ_LEVEL, 0},
	284	{MSC01E_INT_SW1, MSC01_IRQ_LEVEL, 0},
	285	{MSC01E_INT_I8259A, MSC01_IRQ_LEVEL, 0},
	286	{MSC01E_INT_SMI, MSC01_IRQ_LEVEL, 0},
	287	{MSC01E_INT_COREHI, MSC01_IRQ_LEVEL, 0},
	288	{MSC01E_INT_CORELO, MSC01_IRQ_LEVEL, 0},
	289	{MSC01E_INT_TMR, MSC01_IRQ_EDGE, 0},
	290	{MSC01E_INT_PCI, MSC01_IRQ_LEVEL, 0},
	291	{MSC01E_INT_PERFCTR, MSC01_IRQ_LEVEL, 0},
	292	{MSC01E_INT_CPUCTR, MSC01_IRQ_LEVEL, 0}
	293	};
25b8ac3b	294	int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);
e01402b1	295
1da177e4 LT	296	void __init arch_init_irq(void)
1da177e4 LT	297	{
1da177e4	298	init_i8259_irqs();
e01402b1 RB	299
e01402b1 RB	300	if (!cpu_has_veic)
97dcb82d	301	mips_cpu_irq_init();
e01402b1	302
af825586 DV	303	switch (mips_revision_sconid) {
	304	case MIPS_REVISION_SCON_SOCIT:
	305	case MIPS_REVISION_SCON_ROCIT:
d725cf38	306	if (cpu_has_veic)
f8071496 DV	307	init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
	308	MSC01E_INT_BASE, msc_eicirqmap,
	309	msc_nr_eicirqs);
d725cf38	310	else
f8071496 DV	311	init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
	312	MSC01C_INT_BASE, msc_irqmap,
	313	msc_nr_irqs);
d725cf38 CD	314	break;
d725cf38 CD	315
af825586 DV	316	case MIPS_REVISION_SCON_SOCITSC:
af825586 DV	317	case MIPS_REVISION_SCON_SOCITSCP:
e01402b1	318	if (cpu_has_veic)
f8071496 DV	319	init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
	320	MSC01E_INT_BASE, msc_eicirqmap,
	321	msc_nr_eicirqs);
e01402b1	322	else
f8071496 DV	323	init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
	324	MSC01C_INT_BASE, msc_irqmap,
	325	msc_nr_irqs);
e01402b1 RB	326	}
	327
	328	if (cpu_has_veic) {
49a89efb RB	329	set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
	330	set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
	331	setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
	332	setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);
52b3fc04	333	} else if (cpu_has_vint) {
49a89efb RB	334	set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
49a89efb RB	335	set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);
41c594ab	336	#ifdef CONFIG_MIPS_MT_SMTC
49a89efb	337	setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,
41c594ab	338	(0x100 << MIPSCPU_INT_I8259A));
49a89efb	339	setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
41c594ab	340	&corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
c3a005f4 KK	341	/*
	342	* Temporary hack to ensure that the subsidiary device
	343	* interrupts coing in via the i8259A, but associated
	344	* with low IRQ numbers, will restore the Status.IM
	345	* value associated with the i8259A.
	346	*/
	347	{
	348	int i;
	349
	350	for (i = 0; i < 16; i++)
	351	irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A);
	352	}
41c594ab	353	#else /* Not SMTC */
49a89efb	354	setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
f8071496 DV	355	setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
f8071496 DV	356	&corehi_irqaction);
41c594ab	357	#endif /* CONFIG_MIPS_MT_SMTC */
52b3fc04	358	} else {
49a89efb	359	setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
f8071496 DV	360	setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
f8071496 DV	361	&corehi_irqaction);
e01402b1	362	}
1da177e4	363	}