94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
/*
|
|
* 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);
|