/*
* H8/300H interrupt controller driver
*
* Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
*/
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/io.h>
static const char ipr_bit[] = {
7, 6, 5, 5,
4, 4, 4, 4, 3, 3, 3, 3,
2, 2, 2, 2, 1, 1, 1, 1,
0, 0, 0, 0, 15, 15, 15, 15,
14, 14, 14, 14, 13, 13, 13, 13,
-1, -1, -1, -1, 11, 11, 11, 11,
10, 10, 10, 10, 9, 9, 9, 9,
};
static void __iomem *intc_baseaddr;
#define IPR (intc_baseaddr + 6)
static void h8300h_disable_irq(struct irq_data *data)
{
int bit;
int irq = data->irq - 12;
bit = ipr_bit[irq];
if (bit >= 0) {
if (bit < 8)
ctrl_bclr(bit & 7, IPR);
else
ctrl_bclr(bit & 7, (IPR+1));
}
}
static void h8300h_enable_irq(struct irq_data *data)
{
int bit;
int irq = data->irq - 12;
bit = ipr_bit[irq];
if (bit >= 0) {
if (bit < 8)
ctrl_bset(bit & 7, IPR);
else
ctrl_bset(bit & 7, (IPR+1));
}
}
struct irq_chip h8300h_irq_chip = {
.name = "H8/300H-INTC",
.irq_enable = h8300h_enable_irq,
.irq_disable = h8300h_disable_irq,
};
static int irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw_irq_num)
{
irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq);
return 0;
}
static const struct irq_domain_ops irq_ops = {
.map = irq_map,
.xlate = irq_domain_xlate_onecell,
};
static int __init h8300h_intc_of_init(struct device_node *intc,
struct device_node *parent)
{
struct irq_domain *domain;
intc_baseaddr = of_iomap(intc, 0);
BUG_ON(!intc_baseaddr);
/* All interrupt priority low */
writeb(0x00, IPR + 0);
writeb(0x00, IPR + 1);
domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
BUG_ON(!domain);
irq_set_default_host(domain);
return 0;
}
IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);
