[net-next-2.6.git] / arch / mips / lasat / interrupt.c

/*
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  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
 * Lasat boards.
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/irq_cpu.h>
#include <asm/lasat/lasat.h>
#include <asm/lasat/lasatint.h>

#include <irq.h>

static volatile int *lasat_int_status;
static volatile int *lasat_int_mask;
static volatile int lasat_int_mask_shift;

void disable_lasat_irq(unsigned int irq_nr)
{
	irq_nr -= LASAT_IRQ_BASE;
	*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
}

void enable_lasat_irq(unsigned int irq_nr)
{
	irq_nr -= LASAT_IRQ_BASE;
	*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
}

static struct irq_chip lasat_irq_type = {
	.name = "Lasat",
	.ack = disable_lasat_irq,
	.mask = disable_lasat_irq,
	.mask_ack = disable_lasat_irq,
	.unmask = enable_lasat_irq,
};

static inline int ls1bit32(unsigned int x)
{
	int b = 31, s;

	s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
	s =  8; if (x <<  8 == 0) s = 0; b -= s; x <<= s;
	s =  4; if (x <<  4 == 0) s = 0; b -= s; x <<= s;
	s =  2; if (x <<  2 == 0) s = 0; b -= s; x <<= s;
	s =  1; if (x <<  1 == 0) s = 0; b -= s;

	return b;
}

static unsigned long (*get_int_status)(void);

static unsigned long get_int_status_100(void)
{
	return *lasat_int_status & *lasat_int_mask;
}

static unsigned long get_int_status_200(void)
{
	unsigned long int_status;

	int_status = *lasat_int_status;
	int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
	return int_status;
}

asmlinkage void plat_irq_dispatch(void)
{
	unsigned long int_status;
	unsigned int cause = read_c0_cause();
	int irq;

	if (cause & CAUSEF_IP7) {	/* R4000 count / compare IRQ */
		do_IRQ(7);
		return;
	}

	int_status = get_int_status();

	/* if int_status == 0, then the interrupt has already been cleared */
	if (int_status) {
		irq = LASAT_IRQ_BASE + ls1bit32(int_status);

		do_IRQ(irq);
	}
}

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

void __init arch_init_irq(void)
{
	int i;

	if (IS_LASAT_200()) {
		lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
		lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
		lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
		get_int_status = get_int_status_200;
		*lasat_int_mask &= 0xffff;
	} else {
		lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
		lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
		lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
		get_int_status = get_int_status_100;
		*lasat_int_mask = 0;
	}

	mips_cpu_irq_init();

	for (i = LASAT_IRQ_BASE; i <= LASAT_IRQ_END; i++)
		set_irq_chip_and_handler(i, &lasat_irq_type, handle_level_irq);

	setup_irq(LASAT_CASCADE_IRQ, &cascade);
}
Commit	Line	Data
1f21d2bd BM	1	/*
	2	* Carsten Langgaard, carstenl@mips.com
	3	* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
	4	*
	5	* This program is free software; you can distribute it and/or modify it
	6	* under the terms of the GNU General Public License (Version 2) as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	12	* for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
	16	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	17	*
	18	* Routines for generic manipulation of the interrupts found on the
	19	* Lasat boards.
	20	*/
	21	#include <linux/init.h>
1f21d2bd	22	#include <linux/interrupt.h>
89becf5c	23	#include <linux/irq.h>
1f21d2bd	24
a5ccfe5c	25	#include <asm/irq_cpu.h>
b27418aa	26	#include <asm/lasat/lasat.h>
1f21d2bd	27	#include <asm/lasat/lasatint.h>
89becf5c YY	28
89becf5c YY	29	#include <irq.h>
1f21d2bd BM	30
	31	static volatile int *lasat_int_status;
	32	static volatile int *lasat_int_mask;
	33	static volatile int lasat_int_mask_shift;
	34
	35	void disable_lasat_irq(unsigned int irq_nr)
	36	{
0c3bd83b	37	irq_nr -= LASAT_IRQ_BASE;
1f21d2bd BM	38	*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
	39	}
	40
	41	void enable_lasat_irq(unsigned int irq_nr)
	42	{
0c3bd83b	43	irq_nr -= LASAT_IRQ_BASE;
1f21d2bd BM	44	*lasat_int_mask \|= (1 << irq_nr) << lasat_int_mask_shift;
	45	}
	46
	47	static struct irq_chip lasat_irq_type = {
	48	.name = "Lasat",
	49	.ack = disable_lasat_irq,
	50	.mask = disable_lasat_irq,
	51	.mask_ack = disable_lasat_irq,
	52	.unmask = enable_lasat_irq,
	53	};
	54
	55	static inline int ls1bit32(unsigned int x)
	56	{
	57	int b = 31, s;
	58
	59	s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
	60	s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
	61	s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
	62	s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
	63	s = 1; if (x << 1 == 0) s = 0; b -= s;
	64
	65	return b;
	66	}
	67
	68	static unsigned long (*get_int_status)(void);
	69
	70	static unsigned long get_int_status_100(void)
	71	{
	72	return lasat_int_status & lasat_int_mask;
	73	}
	74
	75	static unsigned long get_int_status_200(void)
	76	{
	77	unsigned long int_status;
	78
	79	int_status = *lasat_int_status;
	80	int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
	81	return int_status;
	82	}
	83
	84	asmlinkage void plat_irq_dispatch(void)
	85	{
	86	unsigned long int_status;
	87	unsigned int cause = read_c0_cause();
	88	int irq;
	89
	90	if (cause & CAUSEF_IP7) { /* R4000 count / compare IRQ */
a5ccfe5c	91	do_IRQ(7);
1f21d2bd BM	92	return;
	93	}
	94
	95	int_status = get_int_status();
	96
	97	/* if int_status == 0, then the interrupt has already been cleared */
	98	if (int_status) {
89becf5c	99	irq = LASAT_IRQ_BASE + ls1bit32(int_status);
1f21d2bd BM	100
	101	do_IRQ(irq);
	102	}
	103	}
	104
89becf5c YY	105	static struct irqaction cascade = {
89becf5c YY	106	.handler = no_action,
89becf5c YY	107	.name = "cascade",
	108	};
	109
1f21d2bd BM	110	void __init arch_init_irq(void)
	111	{
	112	int i;
	113
b27418aa	114	if (IS_LASAT_200()) {
1f21d2bd BM	115	lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
	116	lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
	117	lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
	118	get_int_status = get_int_status_200;
	119	*lasat_int_mask &= 0xffff;
b27418aa TB	120	} else {
	121	lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
	122	lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
	123	lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
	124	get_int_status = get_int_status_100;
	125	*lasat_int_mask = 0;
1f21d2bd BM	126	}
1f21d2bd BM	127
a5ccfe5c	128	mips_cpu_irq_init();
89becf5c YY	129
89becf5c YY	130	for (i = LASAT_IRQ_BASE; i <= LASAT_IRQ_END; i++)
1f21d2bd	131	set_irq_chip_and_handler(i, &lasat_irq_type, handle_level_irq);
89becf5c YY	132
89becf5c YY	133	setup_irq(LASAT_CASCADE_IRQ, &cascade);
1f21d2bd	134	}