100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* linux/arch/h8300/kernel/irq.c
|
||
|
|
*
|
||
|
|
* Copyright 2014-2015 Yoshinori Sato <ysato@users.sourceforge.jp>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/irq.h>
|
||
|
|
#include <linux/irqchip.h>
|
||
|
|
#include <linux/irqdomain.h>
|
||
|
|
#include <linux/of_irq.h>
|
||
|
|
#include <asm/traps.h>
|
||
|
|
|
||
|
|
#ifdef CONFIG_RAMKERNEL
|
||
|
|
typedef void (*h8300_vector)(void);
|
||
|
|
|
||
|
|
static const h8300_vector __initconst trap_table[] = {
|
||
|
|
0, 0, 0, 0,
|
||
|
|
_trace_break,
|
||
|
|
0, 0,
|
||
|
|
_nmi,
|
||
|
|
_system_call,
|
||
|
|
0, 0,
|
||
|
|
_trace_break,
|
||
|
|
};
|
||
|
|
|
||
|
|
static unsigned long __init *get_vector_address(void)
|
||
|
|
{
|
||
|
|
unsigned long *rom_vector = CPU_VECTOR;
|
||
|
|
unsigned long base, tmp;
|
||
|
|
int vec_no;
|
||
|
|
|
||
|
|
base = rom_vector[EXT_IRQ0] & ADDR_MASK;
|
||
|
|
|
||
|
|
/* check romvector format */
|
||
|
|
for (vec_no = EXT_IRQ0 + 1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
|
||
|
|
if ((base+(vec_no - EXT_IRQ0)*4) !=
|
||
|
|
(rom_vector[vec_no] & ADDR_MASK))
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* ramvector base address */
|
||
|
|
base -= EXT_IRQ0*4;
|
||
|
|
|
||
|
|
/* writerble? */
|
||
|
|
tmp = ~(*(volatile unsigned long *)base);
|
||
|
|
(*(volatile unsigned long *)base) = tmp;
|
||
|
|
if ((*(volatile unsigned long *)base) != tmp)
|
||
|
|
return NULL;
|
||
|
|
return (unsigned long *)base;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init setup_vector(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
unsigned long *ramvec, *ramvec_p;
|
||
|
|
const h8300_vector *trap_entry;
|
||
|
|
|
||
|
|
ramvec = get_vector_address();
|
||
|
|
if (ramvec == NULL)
|
||
|
|
panic("interrupt vector serup failed.");
|
||
|
|
else
|
||
|
|
pr_debug("virtual vector at 0x%p\n", ramvec);
|
||
|
|
|
||
|
|
/* create redirect table */
|
||
|
|
ramvec_p = ramvec;
|
||
|
|
trap_entry = trap_table;
|
||
|
|
for (i = 0; i < NR_IRQS; i++) {
|
||
|
|
if (i < 12) {
|
||
|
|
if (*trap_entry)
|
||
|
|
*ramvec_p = VECTOR(*trap_entry);
|
||
|
|
ramvec_p++;
|
||
|
|
trap_entry++;
|
||
|
|
} else
|
||
|
|
*ramvec_p++ = REDIRECT(_interrupt_entry);
|
||
|
|
}
|
||
|
|
_interrupt_redirect_table = ramvec;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
void setup_vector(void)
|
||
|
|
{
|
||
|
|
/* noting do */
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
void __init init_IRQ(void)
|
||
|
|
{
|
||
|
|
setup_vector();
|
||
|
|
irqchip_init();
|
||
|
|
}
|
||
|
|
|
||
|
|
asmlinkage void do_IRQ(int irq)
|
||
|
|
{
|
||
|
|
irq_enter();
|
||
|
|
generic_handle_irq(irq);
|
||
|
|
irq_exit();
|
||
|
|
}
|