1 /*
2 * DEC I/O ASIC interrupts.
3 *
4 * Copyright (c) 2002, 2003 Maciej W. Rozycki
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/init.h>
13 #include <linux/irq.h>
14 #include <linux/types.h>
15
16 #include <asm/dec/ioasic.h>
17 #include <asm/dec/ioasic_addrs.h>
18 #include <asm/dec/ioasic_ints.h>
19
20 static int ioasic_irq_base;
21
unmask_ioasic_irq(struct irq_data * d)22 static void unmask_ioasic_irq(struct irq_data *d)
23 {
24 u32 simr;
25
26 simr = ioasic_read(IO_REG_SIMR);
27 simr |= (1 << (d->irq - ioasic_irq_base));
28 ioasic_write(IO_REG_SIMR, simr);
29 }
30
mask_ioasic_irq(struct irq_data * d)31 static void mask_ioasic_irq(struct irq_data *d)
32 {
33 u32 simr;
34
35 simr = ioasic_read(IO_REG_SIMR);
36 simr &= ~(1 << (d->irq - ioasic_irq_base));
37 ioasic_write(IO_REG_SIMR, simr);
38 }
39
ack_ioasic_irq(struct irq_data * d)40 static void ack_ioasic_irq(struct irq_data *d)
41 {
42 mask_ioasic_irq(d);
43 fast_iob();
44 }
45
46 static struct irq_chip ioasic_irq_type = {
47 .name = "IO-ASIC",
48 .irq_ack = ack_ioasic_irq,
49 .irq_mask = mask_ioasic_irq,
50 .irq_mask_ack = ack_ioasic_irq,
51 .irq_unmask = unmask_ioasic_irq,
52 };
53
54 static struct irq_chip ioasic_dma_irq_type = {
55 .name = "IO-ASIC-DMA",
56 .irq_ack = ack_ioasic_irq,
57 .irq_mask = mask_ioasic_irq,
58 .irq_mask_ack = ack_ioasic_irq,
59 .irq_unmask = unmask_ioasic_irq,
60 };
61
init_ioasic_irqs(int base)62 void __init init_ioasic_irqs(int base)
63 {
64 int i;
65
66 /* Mask interrupts. */
67 ioasic_write(IO_REG_SIMR, 0);
68 fast_iob();
69
70 for (i = base; i < base + IO_INR_DMA; i++)
71 irq_set_chip_and_handler(i, &ioasic_irq_type,
72 handle_level_irq);
73 for (; i < base + IO_IRQ_LINES; i++)
74 irq_set_chip(i, &ioasic_dma_irq_type);
75
76 ioasic_irq_base = base;
77 }
78