[deliverable/linux.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/sched.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>

#include <asm/bootinfo.h>
#include <asm/irq.h>
#include <asm/lasat/lasatint.h>
#include <asm/gdb-stub.h>

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

extern asmlinkage void lasatIRQ(void);

void disable_lasat_irq(unsigned int irq_nr)
{
	unsigned long flags;

	local_irq_save(flags);
	*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
	local_irq_restore(flags);
}

void enable_lasat_irq(unsigned int irq_nr)
{
	unsigned long flags;

	local_irq_save(flags);
	*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
	local_irq_restore(flags);
}

static unsigned int startup_lasat_irq(unsigned int irq)
{
	enable_lasat_irq(irq);

	return 0; /* never anything pending */
}

#define shutdown_lasat_irq	disable_lasat_irq

#define mask_and_ack_lasat_irq disable_lasat_irq

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

static struct hw_interrupt_type lasat_irq_type = {
	"Lasat",
	startup_lasat_irq,
	shutdown_lasat_irq,
	enable_lasat_irq,
	disable_lasat_irq,
	mask_and_ack_lasat_irq,
	end_lasat_irq,
	NULL
};

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;
}

void lasat_hw0_irqdispatch(struct pt_regs *regs)
{
	unsigned long int_status;
	int irq;

	int_status = get_int_status();

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

		do_IRQ(irq, regs);
	}
}

void __init arch_init_irq(void)
{
	int i;

	switch (mips_machtype) {
	case MACH_LASAT_100:
		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;
		break;
	case MACH_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;
		break;
	default:
		panic("arch_init_irq: mips_machtype incorrect");
	}

	/* Now safe to set the exception vector. */
	set_except_vector(0, lasatIRQ);

	for (i = 0; i <= LASATINT_END; i++) {
		irq_desc[i].status	= IRQ_DISABLED;
		irq_desc[i].action	= 0;
		irq_desc[i].depth	= 1;
		irq_desc[i].handler	= &lasat_irq_type;
	}
}
Commit	Line	Data
1da177e4 LT	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>
	22	#include <linux/sched.h>
	23	#include <linux/slab.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/kernel_stat.h>
	26
	27	#include <asm/bootinfo.h>
	28	#include <asm/irq.h>
	29	#include <asm/lasat/lasatint.h>
	30	#include <asm/gdb-stub.h>
	31
	32	static volatile int *lasat_int_status = NULL;
	33	static volatile int *lasat_int_mask = NULL;
	34	static volatile int lasat_int_mask_shift;
	35
	36	extern asmlinkage void lasatIRQ(void);
	37
	38	void disable_lasat_irq(unsigned int irq_nr)
	39	{
	40	unsigned long flags;
	41
	42	local_irq_save(flags);
	43	*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
	44	local_irq_restore(flags);
	45	}
	46
	47	void enable_lasat_irq(unsigned int irq_nr)
	48	{
	49	unsigned long flags;
	50
	51	local_irq_save(flags);
	52	*lasat_int_mask \|= (1 << irq_nr) << lasat_int_mask_shift;
	53	local_irq_restore(flags);
	54	}
	55
	56	static unsigned int startup_lasat_irq(unsigned int irq)
	57	{
	58	enable_lasat_irq(irq);
	59
	60	return 0; /* never anything pending */
	61	}
	62
	63	#define shutdown_lasat_irq disable_lasat_irq
	64
65	#define mask_and_ack_lasat_irq disable_lasat_irq
66
67	static void end_lasat_irq(unsigned int irq)
68	{
69	if (!(irq_desc[irq].status & (IRQ_DISABLED\|IRQ_INPROGRESS)))
70	enable_lasat_irq(irq);
71	}
72
73	static struct hw_interrupt_type lasat_irq_type = {
74	"Lasat",
75	startup_lasat_irq,
76	shutdown_lasat_irq,
77	enable_lasat_irq,
78	disable_lasat_irq,
79	mask_and_ack_lasat_irq,
80	end_lasat_irq,
81	NULL
82	};
83
84	static inline int ls1bit32(unsigned int x)
85	{
86	int b = 31, s;
87
88	s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
89	s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
90	s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
91	s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
92	s = 1; if (x << 1 == 0) s = 0; b -= s;
93
94	return b;
95	}
96
97	static unsigned long (* get_int_status)(void);
98
99	static unsigned long get_int_status_100(void)
100	{
101	return lasat_int_status & lasat_int_mask;
102	}
103
104	static unsigned long get_int_status_200(void)
105	{
106	unsigned long int_status;
107
108	int_status = *lasat_int_status;
109	int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
110	return int_status;
111	}
112
113	void lasat_hw0_irqdispatch(struct pt_regs *regs)
114	{
115	unsigned long int_status;
116	int irq;
117
118	int_status = get_int_status();
119
120	/* if int_status == 0, then the interrupt has already been cleared */
121	if (int_status) {
122	irq = ls1bit32(int_status);
123
124	do_IRQ(irq, regs);
125	}
126	}
127
128	void __init arch_init_irq(void)
129	{
130	int i;
131
132	switch (mips_machtype) {
133	case MACH_LASAT_100:
134	lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
135	lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
136	lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
137	get_int_status = get_int_status_100;
138	*lasat_int_mask = 0;
139	break;
140	case MACH_LASAT_200:
141	lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
142	lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
143	lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
144	get_int_status = get_int_status_200;
145	*lasat_int_mask &= 0xffff;
146	break;
147	default:
148	panic("arch_init_irq: mips_machtype incorrect");
149	}
150
151	/* Now safe to set the exception vector. */
152	set_except_vector(0, lasatIRQ);
153
154	for (i = 0; i <= LASATINT_END; i++) {
155	irq_desc[i].status = IRQ_DISABLED;
156	irq_desc[i].action = 0;
157	irq_desc[i].depth = 1;
158	irq_desc[i].handler = &lasat_irq_type;
159	}
160	}