remove unneeded #include <linux/ide.h>'s
[linux-2.6.git] / arch / sh / boards / mach-systemh / irq.c
1 /*
2  * linux/arch/sh/boards/renesas/systemh/irq.c
3  *
4  * Copyright (C) 2000  Kazumoto Kojima
5  *
6  * Hitachi SystemH Support.
7  *
8  * Modified for 7751 SystemH by
9  * Jonathan Short.
10  */
11
12 #include <linux/init.h>
13 #include <linux/irq.h>
14 #include <linux/interrupt.h>
15
16 #include <asm/io.h>
17 #include <asm/systemh7751.h>
18 #include <asm/smc37c93x.h>
19
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;
25
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);
33
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
43 };
44
45 static unsigned int startup_systemh_irq(unsigned int irq)
46 {
47         enable_systemh_irq(irq);
48         return 0; /* never anything pending */
49 }
50
51 static void shutdown_systemh_irq(unsigned int irq)
52 {
53         disable_systemh_irq(irq);
54 }
55
56 static void disable_systemh_irq(unsigned int irq)
57 {
58         if (systemh_irq_mask_register) {
59                 unsigned long val, mask = 0x01 << 1;
60
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);
63                 val &= ~mask;
64                 ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
65
66                 val = ctrl_inl((unsigned long)systemh_irq_request_register);
67                 val |= mask;
68                 ctrl_outl(val, (unsigned long)systemh_irq_request_register);
69         }
70 }
71
72 static void enable_systemh_irq(unsigned int irq)
73 {
74         if (systemh_irq_mask_register) {
75                 unsigned long val, mask = 0x01 << 1;
76
77                 /* Set "irq"th bit in the mask register */
78                 val = ctrl_inl((unsigned long)systemh_irq_mask_register);
79                 val |= mask;
80                 ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
81         }
82 }
83
84 static void mask_and_ack_systemh(unsigned int irq)
85 {
86         disable_systemh_irq(irq);
87 }
88
89 static void end_systemh_irq(unsigned int irq)
90 {
91         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
92                 enable_systemh_irq(irq);
93 }
94
95 void make_systemh_irq(unsigned int irq)
96 {
97         disable_irq_nosync(irq);
98         irq_desc[irq].chip = &systemh_irq_type;
99         disable_systemh_irq(irq);
100 }
101