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>
15 #include <linux/ide.h>
17 #include <asm/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 /* forward declaration */
27 static unsigned int startup_systemh_irq(unsigned int irq
);
28 static void shutdown_systemh_irq(unsigned int irq
);
29 static void enable_systemh_irq(unsigned int irq
);
30 static void disable_systemh_irq(unsigned int irq
);
31 static void mask_and_ack_systemh(unsigned int);
32 static void end_systemh_irq(unsigned int irq
);
34 /* hw_interrupt_type */
35 static struct hw_interrupt_type systemh_irq_type
= {
36 .typename
= " SystemH Register",
37 .startup
= startup_systemh_irq
,
38 .shutdown
= shutdown_systemh_irq
,
39 .enable
= enable_systemh_irq
,
40 .disable
= disable_systemh_irq
,
41 .ack
= mask_and_ack_systemh
,
42 .end
= end_systemh_irq
45 static unsigned int startup_systemh_irq(unsigned int irq
)
47 enable_systemh_irq(irq
);
48 return 0; /* never anything pending */
51 static void shutdown_systemh_irq(unsigned int irq
)
53 disable_systemh_irq(irq
);
56 static void disable_systemh_irq(unsigned int irq
)
58 if (systemh_irq_mask_register
) {
59 unsigned long val
, mask
= 0x01 << 1;
61 /* Clear the "irq"th bit in the mask and set it in the request */
62 val
= ctrl_inl((unsigned long)systemh_irq_mask_register
);
64 ctrl_outl(val
, (unsigned long)systemh_irq_mask_register
);
66 val
= ctrl_inl((unsigned long)systemh_irq_request_register
);
68 ctrl_outl(val
, (unsigned long)systemh_irq_request_register
);
72 static void enable_systemh_irq(unsigned int irq
)
74 if (systemh_irq_mask_register
) {
75 unsigned long val
, mask
= 0x01 << 1;
77 /* Set "irq"th bit in the mask register */
78 val
= ctrl_inl((unsigned long)systemh_irq_mask_register
);
80 ctrl_outl(val
, (unsigned long)systemh_irq_mask_register
);
84 static void mask_and_ack_systemh(unsigned int irq
)
86 disable_systemh_irq(irq
);
89 static void end_systemh_irq(unsigned int irq
)
91 if (!(irq_desc
[irq
].status
& (IRQ_DISABLED
|IRQ_INPROGRESS
)))
92 enable_systemh_irq(irq
);
95 void make_systemh_irq(unsigned int irq
)
97 disable_irq_nosync(irq
);
98 irq_desc
[irq
].chip
= &systemh_irq_type
;
99 disable_systemh_irq(irq
);