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