1/*
 2 * linux/arch/h8300/kernel/irq.c
 3 *
 4 * Copyright 2014-2015 Yoshinori Sato <ysato@users.sourceforge.jp>
 5 */
 6
 7#include <linux/init.h>
 8#include <linux/interrupt.h>
 9#include <linux/irq.h>
10#include <linux/irqdomain.h>
11#include <linux/of_irq.h>
12#include <asm/traps.h>
13
14#ifdef CONFIG_RAMKERNEL
15typedef void (*h8300_vector)(void);
16
17static const h8300_vector __initconst trap_table[] = {
18	0, 0, 0, 0,
19	_trace_break,
20	0, 0,
21	_nmi,
22	_system_call,
23	0, 0,
24	_trace_break,
25};
26
27static unsigned long __init *get_vector_address(void)
28{
29	unsigned long *rom_vector = CPU_VECTOR;
30	unsigned long base, tmp;
31	int vec_no;
32
33	base = rom_vector[EXT_IRQ0] & ADDR_MASK;
34
35	/* check romvector format */
36	for (vec_no = EXT_IRQ0 + 1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
37		if ((base+(vec_no - EXT_IRQ0)*4) !=
38		    (rom_vector[vec_no] & ADDR_MASK))
39			return NULL;
40	}
41
42	/* ramvector base address */
43	base -= EXT_IRQ0*4;
44
45	/* writerble? */
46	tmp = ~(*(volatile unsigned long *)base);
47	(*(volatile unsigned long *)base) = tmp;
48	if ((*(volatile unsigned long *)base) != tmp)
49		return NULL;
50	return (unsigned long *)base;
51}
52
53static void __init setup_vector(void)
54{
55	int i;
56	unsigned long *ramvec, *ramvec_p;
57	const h8300_vector *trap_entry;
58
59	ramvec = get_vector_address();
60	if (ramvec == NULL)
61		panic("interrupt vector serup failed.");
62	else
63		pr_debug("virtual vector at 0x%p\n", ramvec);
64
65	/* create redirect table */
66	ramvec_p = ramvec;
67	trap_entry = trap_table;
68	for (i = 0; i < NR_IRQS; i++) {
69		if (i < 12) {
70			if (*trap_entry)
71				*ramvec_p = VECTOR(*trap_entry);
72			ramvec_p++;
73			trap_entry++;
74		} else
75			*ramvec_p++ = REDIRECT(_interrupt_entry);
76	}
77	_interrupt_redirect_table = ramvec;
78}
79#else
80void setup_vector(void)
81{
82	/* noting do */
83}
84#endif
85
86void __init init_IRQ(void)
87{
88	setup_vector();
89	irqchip_init();
90}
91
92asmlinkage void do_IRQ(int irq)
93{
94	irq_enter();
95	generic_handle_irq(irq);
96	irq_exit();
97}

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * linux/arch/h8300/kernel/irq.c
 4 *
 5 * Copyright 2014-2015 Yoshinori Sato <ysato@users.sourceforge.jp>
 6 */
 7
 8#include <linux/init.h>
 9#include <linux/interrupt.h>
10#include <linux/irq.h>
11#include <linux/irqdomain.h>
12#include <linux/of_irq.h>
13#include <asm/traps.h>
14
15#ifdef CONFIG_RAMKERNEL
16typedef void (*h8300_vector)(void);
17
18static const h8300_vector __initconst trap_table[] = {
19	0, 0, 0, 0,
20	_trace_break,
21	0, 0,
22	_nmi,
23	_system_call,
24	0, 0,
25	_trace_break,
26};
27
28static unsigned long __init *get_vector_address(void)
29{
30	unsigned long *rom_vector = CPU_VECTOR;
31	unsigned long base, tmp;
32	int vec_no;
33
34	base = rom_vector[EXT_IRQ0] & ADDR_MASK;
35
36	/* check romvector format */
37	for (vec_no = EXT_IRQ0 + 1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
38		if ((base+(vec_no - EXT_IRQ0)*4) !=
39		    (rom_vector[vec_no] & ADDR_MASK))
40			return NULL;
41	}
42
43	/* ramvector base address */
44	base -= EXT_IRQ0*4;
45
46	/* writerble? */
47	tmp = ~(*(volatile unsigned long *)base);
48	(*(volatile unsigned long *)base) = tmp;
49	if ((*(volatile unsigned long *)base) != tmp)
50		return NULL;
51	return (unsigned long *)base;
52}
53
54static void __init setup_vector(void)
55{
56	int i;
57	unsigned long *ramvec, *ramvec_p;
58	const h8300_vector *trap_entry;
59
60	ramvec = get_vector_address();
61	if (ramvec == NULL)
62		panic("interrupt vector serup failed.");
63	else
64		pr_debug("virtual vector at 0x%p\n", ramvec);
65
66	/* create redirect table */
67	ramvec_p = ramvec;
68	trap_entry = trap_table;
69	for (i = 0; i < NR_IRQS; i++) {
70		if (i < 12) {
71			if (*trap_entry)
72				*ramvec_p = VECTOR(*trap_entry);
73			ramvec_p++;
74			trap_entry++;
75		} else
76			*ramvec_p++ = REDIRECT(_interrupt_entry);
77	}
78	_interrupt_redirect_table = ramvec;
79}
80#else
81void setup_vector(void)
82{
83	/* noting do */
84}
85#endif
86
87void __init init_IRQ(void)
88{
89	setup_vector();
90	irqchip_init();
91}
92
93asmlinkage void do_IRQ(int irq)
94{
95	irq_enter();
96	generic_handle_irq(irq);
97	irq_exit();
98}