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// 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();
}
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