Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc
[linux-2.6] / arch / mips / dec / ioasic-irq.c
1 /*
2  *      linux/arch/mips/dec/ioasic-irq.c
3  *
4  *      DEC I/O ASIC interrupts.
5  *
6  *      Copyright (c) 2002, 2003  Maciej W. Rozycki
7  *
8  *      This program is free software; you can redistribute it and/or
9  *      modify it under the terms of the GNU General Public License
10  *      as published by the Free Software Foundation; either version
11  *      2 of the License, or (at your option) any later version.
12  */
13
14 #include <linux/init.h>
15 #include <linux/irq.h>
16 #include <linux/types.h>
17
18 #include <asm/dec/ioasic.h>
19 #include <asm/dec/ioasic_addrs.h>
20 #include <asm/dec/ioasic_ints.h>
21
22
23 static int ioasic_irq_base;
24
25
26 static inline void unmask_ioasic_irq(unsigned int irq)
27 {
28         u32 simr;
29
30         simr = ioasic_read(IO_REG_SIMR);
31         simr |= (1 << (irq - ioasic_irq_base));
32         ioasic_write(IO_REG_SIMR, simr);
33 }
34
35 static inline void mask_ioasic_irq(unsigned int irq)
36 {
37         u32 simr;
38
39         simr = ioasic_read(IO_REG_SIMR);
40         simr &= ~(1 << (irq - ioasic_irq_base));
41         ioasic_write(IO_REG_SIMR, simr);
42 }
43
44 static inline void clear_ioasic_irq(unsigned int irq)
45 {
46         u32 sir;
47
48         sir = ~(1 << (irq - ioasic_irq_base));
49         ioasic_write(IO_REG_SIR, sir);
50 }
51
52 static inline void ack_ioasic_irq(unsigned int irq)
53 {
54         mask_ioasic_irq(irq);
55         fast_iob();
56 }
57
58 static inline void end_ioasic_irq(unsigned int irq)
59 {
60         if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
61                 unmask_ioasic_irq(irq);
62 }
63
64 static struct irq_chip ioasic_irq_type = {
65         .typename = "IO-ASIC",
66         .ack = ack_ioasic_irq,
67         .mask = mask_ioasic_irq,
68         .mask_ack = ack_ioasic_irq,
69         .unmask = unmask_ioasic_irq,
70 };
71
72
73 #define unmask_ioasic_dma_irq unmask_ioasic_irq
74
75 #define mask_ioasic_dma_irq mask_ioasic_irq
76
77 #define ack_ioasic_dma_irq ack_ioasic_irq
78
79 static inline void end_ioasic_dma_irq(unsigned int irq)
80 {
81         clear_ioasic_irq(irq);
82         fast_iob();
83         end_ioasic_irq(irq);
84 }
85
86 static struct irq_chip ioasic_dma_irq_type = {
87         .typename = "IO-ASIC-DMA",
88         .ack = ack_ioasic_dma_irq,
89         .mask = mask_ioasic_dma_irq,
90         .mask_ack = ack_ioasic_dma_irq,
91         .unmask = unmask_ioasic_dma_irq,
92         .end = end_ioasic_dma_irq,
93 };
94
95
96 void __init init_ioasic_irqs(int base)
97 {
98         int i;
99
100         /* Mask interrupts. */
101         ioasic_write(IO_REG_SIMR, 0);
102         fast_iob();
103
104         for (i = base; i < base + IO_INR_DMA; i++)
105                 set_irq_chip_and_handler(i, &ioasic_irq_type,
106                                          handle_level_irq);
107         for (; i < base + IO_IRQ_LINES; i++)
108                 set_irq_chip(i, &ioasic_dma_irq_type);
109
110         ioasic_irq_base = base;
111 }