2 * linux/arch/sh/boards/renesas/systemh/irq.c
4 * Copyright (C) 2000 Kazumoto Kojima
6 * Hitachi SystemH Support.
8 * Modified for 7751 SystemH by
12 #include <linux/init.h>
13 #include <linux/irq.h>
14 #include <linux/interrupt.h>
17 #include <mach/systemh7751.h>
18 #include <asm/smc37c93x.h>
20 /* address of external interrupt mask register
21 * address must be set prior to use these (maybe in init_XXX_irq())
22 * XXX : is it better to use .config than specifying it in code? */
23 static unsigned long *systemh_irq_mask_register = (unsigned long *)0xB3F10004;
24 static unsigned long *systemh_irq_request_register = (unsigned long *)0xB3F10000;
26 static void disable_systemh_irq(struct irq_data *data)
28 unsigned long val, mask = 0x01 << 1;
30 /* Clear the "irq"th bit in the mask and set it in the request */
31 val = __raw_readl((unsigned long)systemh_irq_mask_register);
33 __raw_writel(val, (unsigned long)systemh_irq_mask_register);
35 val = __raw_readl((unsigned long)systemh_irq_request_register);
37 __raw_writel(val, (unsigned long)systemh_irq_request_register);
40 static void enable_systemh_irq(struct irq_data *data)
42 unsigned long val, mask = 0x01 << 1;
44 /* Set "irq"th bit in the mask register */
45 val = __raw_readl((unsigned long)systemh_irq_mask_register);
47 __raw_writel(val, (unsigned long)systemh_irq_mask_register);
50 static struct irq_chip systemh_irq_type = {
51 .name = "SystemH Register",
52 .irq_unmask = enable_systemh_irq,
53 .irq_mask = disable_systemh_irq,
56 void make_systemh_irq(unsigned int irq)
58 disable_irq_nosync(irq);
59 set_irq_chip_and_handler(irq, &systemh_irq_type, handle_level_irq);
60 disable_systemh_irq(irq_get_irq_data(irq));