[MIPS] Eleminate interrupt migration helper use.
[linux-2.6.git] / arch / mips / vr41xx / nec-cmbvr4133 / irq.c
1 /*
2  * arch/mips/vr41xx/nec-cmbvr4133/irq.c
3  *
4  * Interrupt routines for the NEC CMB-VR4133 board.
5  *
6  * Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com> and
7  *         Alex Sapkov <asapkov@ru.mvista.com>
8  *
9  * 2003-2004 (c) MontaVista, Software, Inc. This file is licensed under
10  * the terms of the GNU General Public License version 2. This program
11  * is licensed "as is" without any warranty of any kind, whether express
12  * or implied.
13  *
14  * Support for NEC-CMBVR4133 in 2.6
15  * Manish Lachwani (mlachwani@mvista.com)
16  */
17 #include <linux/bitops.h>
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/ioport.h>
21 #include <linux/interrupt.h>
22
23 #include <asm/io.h>
24 #include <asm/vr41xx/cmbvr4133.h>
25
26 extern void enable_8259A_irq(unsigned int irq);
27 extern void disable_8259A_irq(unsigned int irq);
28 extern void mask_and_ack_8259A(unsigned int irq);
29 extern void init_8259A(int hoge);
30
31 extern int vr4133_rockhopper;
32
33 static unsigned int startup_i8259_irq(unsigned int irq)
34 {
35         enable_8259A_irq(irq - I8259_IRQ_BASE);
36         return 0;
37 }
38
39 static void shutdown_i8259_irq(unsigned int irq)
40 {
41         disable_8259A_irq(irq - I8259_IRQ_BASE);
42 }
43
44 static void enable_i8259_irq(unsigned int irq)
45 {
46         enable_8259A_irq(irq - I8259_IRQ_BASE);
47 }
48
49 static void disable_i8259_irq(unsigned int irq)
50 {
51         disable_8259A_irq(irq - I8259_IRQ_BASE);
52 }
53
54 static void ack_i8259_irq(unsigned int irq)
55 {
56         mask_and_ack_8259A(irq - I8259_IRQ_BASE);
57 }
58
59 static void end_i8259_irq(unsigned int irq)
60 {
61         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
62                 enable_8259A_irq(irq - I8259_IRQ_BASE);
63 }
64
65 static struct irq_chip i8259_irq_type = {
66         .typename       = "XT-PIC",
67         .startup        = startup_i8259_irq,
68         .shutdown       = shutdown_i8259_irq,
69         .enable         = enable_i8259_irq,
70         .disable        = disable_i8259_irq,
71         .ack            = ack_i8259_irq,
72         .end            = end_i8259_irq,
73 };
74
75 static int i8259_get_irq_number(int irq)
76 {
77         unsigned long isr;
78
79         isr = inb(0x20);
80         irq = ffz(~isr);
81         if (irq == 2) {
82                 isr = inb(0xa0);
83                 irq = 8 + ffz(~isr);
84         }
85
86         if (irq < 0 || irq > 15)
87                 return -EINVAL;
88
89         return I8259_IRQ_BASE + irq;
90 }
91
92 static struct irqaction i8259_slave_cascade = {
93         .handler        = &no_action,
94         .name           = "cascade",
95 };
96
97 void __init rockhopper_init_irq(void)
98 {
99         int i;
100
101         if(!vr4133_rockhopper) {
102                 printk(KERN_ERR "Not a Rockhopper Board \n");
103                 return;
104         }
105
106         for (i = I8259_IRQ_BASE; i <= I8259_IRQ_LAST; i++)
107                 irq_desc[i].chip = &i8259_irq_type;
108
109         setup_irq(I8259_SLAVE_IRQ, &i8259_slave_cascade);
110
111         vr41xx_set_irq_trigger(CMBVR41XX_INTC_PIN, TRIGGER_LEVEL, SIGNAL_THROUGH);
112         vr41xx_set_irq_level(CMBVR41XX_INTC_PIN, LEVEL_HIGH);
113         vr41xx_cascade_irq(CMBVR41XX_INTC_IRQ, i8259_get_irq_number);
114 }