[net-next-2.6.git] / arch / mips / sibyte / sb1250 / irq.c

/*
 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that 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.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/kernel_stat.h>

#include <asm/errno.h>
#include <asm/signal.h>
#include <asm/system.h>
#include <asm/time.h>
#include <asm/io.h>

#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_int.h>
#include <asm/sibyte/sb1250_uart.h>
#include <asm/sibyte/sb1250_scd.h>
#include <asm/sibyte/sb1250.h>

/*
 * These are the routines that handle all the low level interrupt stuff.
 * Actions handled here are: initialization of the interrupt map, requesting of
 * interrupt lines by handlers, dispatching if interrupts to handlers, probing
 * for interrupt lines
 */


static void end_sb1250_irq(unsigned int irq);
static void enable_sb1250_irq(unsigned int irq);
static void disable_sb1250_irq(unsigned int irq);
static void ack_sb1250_irq(unsigned int irq);
#ifdef CONFIG_SMP
static int sb1250_set_affinity(unsigned int irq, const struct cpumask *mask);
#endif

#ifdef CONFIG_SIBYTE_HAS_LDT
extern unsigned long ldt_eoi_space;
#endif

static struct irq_chip sb1250_irq_type = {
	.name = "SB1250-IMR",
	.ack = ack_sb1250_irq,
	.mask = disable_sb1250_irq,
	.mask_ack = ack_sb1250_irq,
	.unmask = enable_sb1250_irq,
	.end = end_sb1250_irq,
#ifdef CONFIG_SMP
	.set_affinity = sb1250_set_affinity
#endif
};

/* Store the CPU id (not the logical number) */
int sb1250_irq_owner[SB1250_NR_IRQS];

static DEFINE_RAW_SPINLOCK(sb1250_imr_lock);

void sb1250_mask_irq(int cpu, int irq)
{
	unsigned long flags;
	u64 cur_ints;

	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
					R_IMR_INTERRUPT_MASK));
	cur_ints |= (((u64) 1) << irq);
	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
					R_IMR_INTERRUPT_MASK));
	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
}

void sb1250_unmask_irq(int cpu, int irq)
{
	unsigned long flags;
	u64 cur_ints;

	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
					R_IMR_INTERRUPT_MASK));
	cur_ints &= ~(((u64) 1) << irq);
	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
					R_IMR_INTERRUPT_MASK));
	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
}

#ifdef CONFIG_SMP
static int sb1250_set_affinity(unsigned int irq, const struct cpumask *mask)
{
	int i = 0, old_cpu, cpu, int_on;
	u64 cur_ints;
	unsigned long flags;

	i = cpumask_first(mask);

	/* Convert logical CPU to physical CPU */
	cpu = cpu_logical_map(i);

	/* Protect against other affinity changers and IMR manipulation */
	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);

	/* Swizzle each CPU's IMR (but leave the IP selection alone) */
	old_cpu = sb1250_irq_owner[irq];
	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(old_cpu) +
					R_IMR_INTERRUPT_MASK));
	int_on = !(cur_ints & (((u64) 1) << irq));
	if (int_on) {
		/* If it was on, mask it */
		cur_ints |= (((u64) 1) << irq);
		____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(old_cpu) +
					R_IMR_INTERRUPT_MASK));
	}
	sb1250_irq_owner[irq] = cpu;
	if (int_on) {
		/* unmask for the new CPU */
		cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
					R_IMR_INTERRUPT_MASK));
		cur_ints &= ~(((u64) 1) << irq);
		____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
					R_IMR_INTERRUPT_MASK));
	}
	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);

	return 0;
}
#endif

/*****************************************************************************/

static void disable_sb1250_irq(unsigned int irq)
{
	sb1250_mask_irq(sb1250_irq_owner[irq], irq);
}

static void enable_sb1250_irq(unsigned int irq)
{
	sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
}


static void ack_sb1250_irq(unsigned int irq)
{
#ifdef CONFIG_SIBYTE_HAS_LDT
	u64 pending;

	/*
	 * If the interrupt was an HT interrupt, now is the time to
	 * clear it.  NOTE: we assume the HT bridge was set up to
	 * deliver the interrupts to all CPUs (which makes affinity
	 * changing easier for us)
	 */
	pending = __raw_readq(IOADDR(A_IMR_REGISTER(sb1250_irq_owner[irq],
						    R_IMR_LDT_INTERRUPT)));
	pending &= ((u64)1 << (irq));
	if (pending) {
		int i;
		for (i=0; i<NR_CPUS; i++) {
			int cpu;
#ifdef CONFIG_SMP
			cpu = cpu_logical_map(i);
#else
			cpu = i;
#endif
			/*
			 * Clear for all CPUs so an affinity switch
			 * doesn't find an old status
			 */
			__raw_writeq(pending,
				     IOADDR(A_IMR_REGISTER(cpu,
						R_IMR_LDT_INTERRUPT_CLR)));
		}

		/*
		 * Generate EOI.  For Pass 1 parts, EOI is a nop.  For
		 * Pass 2, the LDT world may be edge-triggered, but
		 * this EOI shouldn't hurt.  If they are
		 * level-sensitive, the EOI is required.
		 */
		*(uint32_t *)(ldt_eoi_space+(irq<<16)+(7<<2)) = 0;
	}
#endif
	sb1250_mask_irq(sb1250_irq_owner[irq], irq);
}


static void end_sb1250_irq(unsigned int irq)
{
	if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
		sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
	}
}


void __init init_sb1250_irqs(void)
{
	int i;

	for (i = 0; i < SB1250_NR_IRQS; i++) {
		set_irq_chip_and_handler(i, &sb1250_irq_type, handle_level_irq);
		sb1250_irq_owner[i] = 0;
	}
}


/*
 *  arch_init_irq is called early in the boot sequence from init/main.c via
 *  init_IRQ.  It is responsible for setting up the interrupt mapper and
 *  installing the handler that will be responsible for dispatching interrupts
 *  to the "right" place.
 */
/*
 * For now, map all interrupts to IP[2].  We could save
 * some cycles by parceling out system interrupts to different
 * IP lines, but keep it simple for bringup.  We'll also direct
 * all interrupts to a single CPU; we should probably route
 * PCI and LDT to one cpu and everything else to the other
 * to balance the load a bit.
 *
 * On the second cpu, everything is set to IP5, which is
 * ignored, EXCEPT the mailbox interrupt.  That one is
 * set to IP[2] so it is handled.  This is needed so we
 * can do cross-cpu function calls, as requred by SMP
 */

#define IMR_IP2_VAL	K_INT_MAP_I0
#define IMR_IP3_VAL	K_INT_MAP_I1
#define IMR_IP4_VAL	K_INT_MAP_I2
#define IMR_IP5_VAL	K_INT_MAP_I3
#define IMR_IP6_VAL	K_INT_MAP_I4

void __init arch_init_irq(void)
{

	unsigned int i;
	u64 tmp;
	unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
		STATUSF_IP1 | STATUSF_IP0;

	/* Default everything to IP2 */
	for (i = 0; i < SB1250_NR_IRQS; i++) {	/* was I0 */
		__raw_writeq(IMR_IP2_VAL,
			     IOADDR(A_IMR_REGISTER(0,
						   R_IMR_INTERRUPT_MAP_BASE) +
				    (i << 3)));
		__raw_writeq(IMR_IP2_VAL,
			     IOADDR(A_IMR_REGISTER(1,
						   R_IMR_INTERRUPT_MAP_BASE) +
				    (i << 3)));
	}

	init_sb1250_irqs();

	/*
	 * Map the high 16 bits of the mailbox registers to IP[3], for
	 * inter-cpu messages
	 */
	/* Was I1 */
	__raw_writeq(IMR_IP3_VAL,
		     IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
			    (K_INT_MBOX_0 << 3)));
	__raw_writeq(IMR_IP3_VAL,
		     IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MAP_BASE) +
			    (K_INT_MBOX_0 << 3)));

	/* Clear the mailboxes.  The firmware may leave them dirty */
	__raw_writeq(0xffffffffffffffffULL,
		     IOADDR(A_IMR_REGISTER(0, R_IMR_MAILBOX_CLR_CPU)));
	__raw_writeq(0xffffffffffffffffULL,
		     IOADDR(A_IMR_REGISTER(1, R_IMR_MAILBOX_CLR_CPU)));

	/* Mask everything except the mailbox registers for both cpus */
	tmp = ~((u64) 0) ^ (((u64) 1) << K_INT_MBOX_0);
	__raw_writeq(tmp, IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MASK)));
	__raw_writeq(tmp, IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MASK)));

	/*
	 * Note that the timer interrupts are also mapped, but this is
	 * done in sb1250_time_init().  Also, the profiling driver
	 * does its own management of IP7.
	 */

	/* Enable necessary IPs, disable the rest */
	change_c0_status(ST0_IM, imask);
}

extern void sb1250_mailbox_interrupt(void);

static inline void dispatch_ip2(void)
{
	unsigned int cpu = smp_processor_id();
	unsigned long long mask;

	/*
	 * Default...we've hit an IP[2] interrupt, which means we've got to
	 * check the 1250 interrupt registers to figure out what to do.  Need
	 * to detect which CPU we're on, now that smp_affinity is supported.
	 */
	mask = __raw_readq(IOADDR(A_IMR_REGISTER(cpu,
				  R_IMR_INTERRUPT_STATUS_BASE)));
	if (mask)
		do_IRQ(fls64(mask) - 1);
}

asmlinkage void plat_irq_dispatch(void)
{
	unsigned int cpu = smp_processor_id();
	unsigned int pending;

	/*
	 * What a pain. We have to be really careful saving the upper 32 bits
	 * of any * register across function calls if we don't want them
	 * trashed--since were running in -o32, the calling routing never saves
	 * the full 64 bits of a register across a function call.  Being the
	 * interrupt handler, we're guaranteed that interrupts are disabled
	 * during this code so we don't have to worry about random interrupts
	 * blasting the high 32 bits.
	 */

	pending = read_c0_cause() & read_c0_status() & ST0_IM;

	if (pending & CAUSEF_IP7) /* CPU performance counter interrupt */
		do_IRQ(MIPS_CPU_IRQ_BASE + 7);
	else if (pending & CAUSEF_IP4)
		do_IRQ(K_INT_TIMER_0 + cpu); 	/* sb1250_timer_interrupt() */

#ifdef CONFIG_SMP
	else if (pending & CAUSEF_IP3)
		sb1250_mailbox_interrupt();
#endif

	else if (pending & CAUSEF_IP2)
		dispatch_ip2();
	else
		spurious_interrupt();
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version 2
	7	* of the License, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*/
1da177e4 LT	18	#include <linux/kernel.h>
	19	#include <linux/init.h>
	20	#include <linux/linkage.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/spinlock.h>
	23	#include <linux/smp.h>
	24	#include <linux/mm.h>
1da177e4 LT	25	#include <linux/kernel_stat.h>
	26
	27	#include <asm/errno.h>
	28	#include <asm/signal.h>
	29	#include <asm/system.h>
7bcf7717	30	#include <asm/time.h>
1da177e4 LT	31	#include <asm/io.h>
	32
	33	#include <asm/sibyte/sb1250_regs.h>
	34	#include <asm/sibyte/sb1250_int.h>
	35	#include <asm/sibyte/sb1250_uart.h>
	36	#include <asm/sibyte/sb1250_scd.h>
	37	#include <asm/sibyte/sb1250.h>
	38
	39	/*
	40	* These are the routines that handle all the low level interrupt stuff.
	41	* Actions handled here are: initialization of the interrupt map, requesting of
	42	* interrupt lines by handlers, dispatching if interrupts to handlers, probing
	43	* for interrupt lines
	44	*/
	45
	46
1da177e4 LT	47	static void end_sb1250_irq(unsigned int irq);
	48	static void enable_sb1250_irq(unsigned int irq);
	49	static void disable_sb1250_irq(unsigned int irq);
1da177e4 LT	50	static void ack_sb1250_irq(unsigned int irq);
1da177e4 LT	51	#ifdef CONFIG_SMP
d5dedd45	52	static int sb1250_set_affinity(unsigned int irq, const struct cpumask *mask);
1da177e4 LT	53	#endif
	54
	55	#ifdef CONFIG_SIBYTE_HAS_LDT
	56	extern unsigned long ldt_eoi_space;
	57	#endif
	58
94dee171	59	static struct irq_chip sb1250_irq_type = {
70d21cde	60	.name = "SB1250-IMR",
8ab00b9a	61	.ack = ack_sb1250_irq,
1603b5ac AN	62	.mask = disable_sb1250_irq,
	63	.mask_ack = ack_sb1250_irq,
	64	.unmask = enable_sb1250_irq,
8ab00b9a	65	.end = end_sb1250_irq,
1da177e4	66	#ifdef CONFIG_SMP
8ab00b9a	67	.set_affinity = sb1250_set_affinity
1da177e4 LT	68	#endif
	69	};
	70
	71	/* Store the CPU id (not the logical number) */
	72	int sb1250_irq_owner[SB1250_NR_IRQS];
	73
5772f6de	74	static DEFINE_RAW_SPINLOCK(sb1250_imr_lock);
1da177e4 LT	75
	76	void sb1250_mask_irq(int cpu, int irq)
	77	{
	78	unsigned long flags;
	79	u64 cur_ints;
	80
5772f6de	81	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
65bda1a9 MR	82	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
65bda1a9 MR	83	R_IMR_INTERRUPT_MASK));
1da177e4	84	cur_ints \|= (((u64) 1) << irq);
65bda1a9 MR	85	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
65bda1a9 MR	86	R_IMR_INTERRUPT_MASK));
5772f6de	87	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
1da177e4 LT	88	}
	89
	90	void sb1250_unmask_irq(int cpu, int irq)
	91	{
	92	unsigned long flags;
	93	u64 cur_ints;
	94
5772f6de	95	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
65bda1a9 MR	96	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
65bda1a9 MR	97	R_IMR_INTERRUPT_MASK));
1da177e4	98	cur_ints &= ~(((u64) 1) << irq);
65bda1a9 MR	99	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
65bda1a9 MR	100	R_IMR_INTERRUPT_MASK));
5772f6de	101	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
1da177e4 LT	102	}
	103
	104	#ifdef CONFIG_SMP
d5dedd45	105	static int sb1250_set_affinity(unsigned int irq, const struct cpumask *mask)
1da177e4 LT	106	{
	107	int i = 0, old_cpu, cpu, int_on;
	108	u64 cur_ints;
1da177e4 LT	109	unsigned long flags;
1da177e4 LT	110
0de26520	111	i = cpumask_first(mask);
1da177e4	112
1da177e4 LT	113	/* Convert logical CPU to physical CPU */
	114	cpu = cpu_logical_map(i);
	115
	116	/* Protect against other affinity changers and IMR manipulation */
5772f6de	117	raw_spin_lock_irqsave(&sb1250_imr_lock, flags);
1da177e4 LT	118
	119	/* Swizzle each CPU's IMR (but leave the IP selection alone) */
	120	old_cpu = sb1250_irq_owner[irq];
65bda1a9 MR	121	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(old_cpu) +
65bda1a9 MR	122	R_IMR_INTERRUPT_MASK));
1da177e4 LT	123	int_on = !(cur_ints & (((u64) 1) << irq));
	124	if (int_on) {
	125	/* If it was on, mask it */
	126	cur_ints \|= (((u64) 1) << irq);
65bda1a9 MR	127	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(old_cpu) +
65bda1a9 MR	128	R_IMR_INTERRUPT_MASK));
1da177e4 LT	129	}
	130	sb1250_irq_owner[irq] = cpu;
	131	if (int_on) {
	132	/* unmask for the new CPU */
65bda1a9 MR	133	cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) +
65bda1a9 MR	134	R_IMR_INTERRUPT_MASK));
1da177e4	135	cur_ints &= ~(((u64) 1) << irq);
65bda1a9 MR	136	____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) +
65bda1a9 MR	137	R_IMR_INTERRUPT_MASK));
1da177e4	138	}
5772f6de	139	raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags);
d5dedd45 YL	140
d5dedd45 YL	141	return 0;
1da177e4 LT	142	}
	143	#endif
	144
1da177e4 LT	145	/*****************************************************************************/
1da177e4 LT	146
1da177e4 LT	147	static void disable_sb1250_irq(unsigned int irq)
	148	{
	149	sb1250_mask_irq(sb1250_irq_owner[irq], irq);
	150	}
	151
	152	static void enable_sb1250_irq(unsigned int irq)
	153	{
	154	sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
	155	}
	156
	157
	158	static void ack_sb1250_irq(unsigned int irq)
	159	{
	160	#ifdef CONFIG_SIBYTE_HAS_LDT
	161	u64 pending;
	162
	163	/*
	164	* If the interrupt was an HT interrupt, now is the time to
	165	* clear it. NOTE: we assume the HT bridge was set up to
	166	* deliver the interrupts to all CPUs (which makes affinity
	167	* changing easier for us)
	168	*/
65bda1a9 MR	169	pending = __raw_readq(IOADDR(A_IMR_REGISTER(sb1250_irq_owner[irq],
65bda1a9 MR	170	R_IMR_LDT_INTERRUPT)));
1da177e4 LT	171	pending &= ((u64)1 << (irq));
	172	if (pending) {
	173	int i;
	174	for (i=0; i<NR_CPUS; i++) {
	175	int cpu;
	176	#ifdef CONFIG_SMP
	177	cpu = cpu_logical_map(i);
	178	#else
	179	cpu = i;
	180	#endif
	181	/*
	182	* Clear for all CPUs so an affinity switch
	183	* doesn't find an old status
	184	*/
65bda1a9 MR	185	__raw_writeq(pending,
65bda1a9 MR	186	IOADDR(A_IMR_REGISTER(cpu,
1da177e4 LT	187	R_IMR_LDT_INTERRUPT_CLR)));
	188	}
	189
	190	/*
	191	* Generate EOI. For Pass 1 parts, EOI is a nop. For
	192	* Pass 2, the LDT world may be edge-triggered, but
	193	* this EOI shouldn't hurt. If they are
	194	* level-sensitive, the EOI is required.
	195	*/
	196	(uint32_t )(ldt_eoi_space+(irq<<16)+(7<<2)) = 0;
	197	}
	198	#endif
	199	sb1250_mask_irq(sb1250_irq_owner[irq], irq);
	200	}
	201
	202
	203	static void end_sb1250_irq(unsigned int irq)
	204	{
	205	if (!(irq_desc[irq].status & (IRQ_DISABLED \| IRQ_INPROGRESS))) {
	206	sb1250_unmask_irq(sb1250_irq_owner[irq], irq);
	207	}
	208	}
	209
	210
	211	void __init init_sb1250_irqs(void)
	212	{
	213	int i;
	214
1603b5ac	215	for (i = 0; i < SB1250_NR_IRQS; i++) {
c87e0909	216	set_irq_chip_and_handler(i, &sb1250_irq_type, handle_level_irq);
1603b5ac	217	sb1250_irq_owner[i] = 0;
1da177e4 LT	218	}
	219	}
	220
	221
1da177e4 LT	222	/*
	223	* arch_init_irq is called early in the boot sequence from init/main.c via
	224	* init_IRQ. It is responsible for setting up the interrupt mapper and
	225	* installing the handler that will be responsible for dispatching interrupts
	226	* to the "right" place.
	227	*/
	228	/*
	229	* For now, map all interrupts to IP[2]. We could save
	230	* some cycles by parceling out system interrupts to different
	231	* IP lines, but keep it simple for bringup. We'll also direct
	232	* all interrupts to a single CPU; we should probably route
	233	* PCI and LDT to one cpu and everything else to the other
	234	* to balance the load a bit.
	235	*
	236	* On the second cpu, everything is set to IP5, which is
	237	* ignored, EXCEPT the mailbox interrupt. That one is
	238	* set to IP[2] so it is handled. This is needed so we
	239	* can do cross-cpu function calls, as requred by SMP
	240	*/
	241
	242	#define IMR_IP2_VAL K_INT_MAP_I0
	243	#define IMR_IP3_VAL K_INT_MAP_I1
	244	#define IMR_IP4_VAL K_INT_MAP_I2
	245	#define IMR_IP5_VAL K_INT_MAP_I3
	246	#define IMR_IP6_VAL K_INT_MAP_I4
	247
	248	void __init arch_init_irq(void)
	249	{
	250
	251	unsigned int i;
	252	u64 tmp;
	253	unsigned int imask = STATUSF_IP4 \| STATUSF_IP3 \| STATUSF_IP2 \|
	254	STATUSF_IP1 \| STATUSF_IP0;
	255
	256	/* Default everything to IP2 */
	257	for (i = 0; i < SB1250_NR_IRQS; i++) { /* was I0 */
65bda1a9 MR	258	__raw_writeq(IMR_IP2_VAL,
	259	IOADDR(A_IMR_REGISTER(0,
	260	R_IMR_INTERRUPT_MAP_BASE) +
	261	(i << 3)));
	262	__raw_writeq(IMR_IP2_VAL,
	263	IOADDR(A_IMR_REGISTER(1,
	264	R_IMR_INTERRUPT_MAP_BASE) +
	265	(i << 3)));
1da177e4 LT	266	}
	267
	268	init_sb1250_irqs();
	269
	270	/*
	271	* Map the high 16 bits of the mailbox registers to IP[3], for
	272	* inter-cpu messages
	273	*/
	274	/* Was I1 */
65bda1a9 MR	275	__raw_writeq(IMR_IP3_VAL,
	276	IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) +
	277	(K_INT_MBOX_0 << 3)));
	278	__raw_writeq(IMR_IP3_VAL,
	279	IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MAP_BASE) +
	280	(K_INT_MBOX_0 << 3)));
1da177e4 LT	281
1da177e4 LT	282	/* Clear the mailboxes. The firmware may leave them dirty */
65bda1a9 MR	283	__raw_writeq(0xffffffffffffffffULL,
	284	IOADDR(A_IMR_REGISTER(0, R_IMR_MAILBOX_CLR_CPU)));
	285	__raw_writeq(0xffffffffffffffffULL,
	286	IOADDR(A_IMR_REGISTER(1, R_IMR_MAILBOX_CLR_CPU)));
1da177e4 LT	287
	288	/* Mask everything except the mailbox registers for both cpus */
	289	tmp = ~((u64) 0) ^ (((u64) 1) << K_INT_MBOX_0);
65bda1a9 MR	290	__raw_writeq(tmp, IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MASK)));
65bda1a9 MR	291	__raw_writeq(tmp, IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MASK)));
1da177e4	292
1da177e4 LT	293	/*
1da177e4 LT	294	* Note that the timer interrupts are also mapped, but this is
42a3b4f2	295	* done in sb1250_time_init(). Also, the profiling driver
1da177e4 LT	296	* does its own management of IP7.
	297	*/
	298
1da177e4 LT	299	/* Enable necessary IPs, disable the rest */
1da177e4 LT	300	change_c0_status(ST0_IM, imask);
1da177e4 LT	301	}
1da177e4 LT	302
937a8015	303	extern void sb1250_mailbox_interrupt(void);
4fb60a4b	304
d0453365 RB	305	static inline void dispatch_ip2(void)
	306	{
	307	unsigned int cpu = smp_processor_id();
	308	unsigned long long mask;
	309
	310	/*
	311	* Default...we've hit an IP[2] interrupt, which means we've got to
	312	* check the 1250 interrupt registers to figure out what to do. Need
	313	* to detect which CPU we're on, now that smp_affinity is supported.
	314	*/
	315	mask = __raw_readq(IOADDR(A_IMR_REGISTER(cpu,
	316	R_IMR_INTERRUPT_STATUS_BASE)));
	317	if (mask)
	318	do_IRQ(fls64(mask) - 1);
	319	}
	320
937a8015	321	asmlinkage void plat_irq_dispatch(void)
e4ac58af	322	{
d527eef5	323	unsigned int cpu = smp_processor_id();
e4ac58af RB	324	unsigned int pending;
e4ac58af RB	325
e4ac58af RB	326	/*
	327	* What a pain. We have to be really careful saving the upper 32 bits
	328	* of any * register across function calls if we don't want them
	329	* trashed--since were running in -o32, the calling routing never saves
	330	* the full 64 bits of a register across a function call. Being the
	331	* interrupt handler, we're guaranteed that interrupts are disabled
	332	* during this code so we don't have to worry about random interrupts
	333	* blasting the high 32 bits.
	334	*/
	335
119537c0	336	pending = read_c0_cause() & read_c0_status() & ST0_IM;
e4ac58af	337
7bcf7717 RB	338	if (pending & CAUSEF_IP7) /* CPU performance counter interrupt */
	339	do_IRQ(MIPS_CPU_IRQ_BASE + 7);
	340	else if (pending & CAUSEF_IP4)
d527eef5	341	do_IRQ(K_INT_TIMER_0 + cpu); /* sb1250_timer_interrupt() */
e4ac58af RB	342
e4ac58af RB	343	#ifdef CONFIG_SMP
6e61e85b	344	else if (pending & CAUSEF_IP3)
937a8015	345	sb1250_mailbox_interrupt();
e4ac58af RB	346	#endif
e4ac58af RB	347
d0453365 RB	348	else if (pending & CAUSEF_IP2)
	349	dispatch_ip2();
	350	else
937a8015	351	spurious_interrupt();
e4ac58af	352	}