1/*
2 *	linux/include/asm-parisc/irq.h
3 *
4 *	(C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar,
5 *		Copyright 1999 SuSE GmbH
6 *
7 *	IRQ/IPI changes taken from work by Thomas Radke
8 *	<tomsoft@informatik.tu-chemnitz.de>
9 */
10
11#ifndef _ASM_PARISC_IRQ_H
12#define _ASM_PARISC_IRQ_H
13
14#include <asm/ptrace.h>
15#include <asm/types.h>
16
17#include <linux/string.h>
18#include <linux/interrupt.h>
19
20
21#define CPU_IRQ_REGION		1
22#define TIMER_IRQ		(IRQ_FROM_REGION(CPU_IRQ_REGION) | 0)
23#define	IPI_IRQ			(IRQ_FROM_REGION(CPU_IRQ_REGION) | 1)
24
25/* This should be 31 for PA1.1 binaries and 63 for PA-2.0 wide mode */
26#define MAX_CPU_IRQ		(BITS_PER_LONG - 1)
27
28#if BITS_PER_LONG == 32
29#  define IRQ_REGION_SHIFT 	5
30#else
31#  define IRQ_REGION_SHIFT 	6
32#endif
33
34#define IRQ_PER_REGION		(1 << IRQ_REGION_SHIFT)
35#define NR_IRQ_REGS		16
36#define NR_IRQS			(NR_IRQ_REGS * IRQ_PER_REGION)
37
38#define IRQ_REGION(irq) 	((irq) >> IRQ_REGION_SHIFT)
39#define IRQ_OFFSET(irq)		((irq) & ((1<<IRQ_REGION_SHIFT)-1))
40#define	IRQ_FROM_REGION(reg)	((reg) << IRQ_REGION_SHIFT)
41
42#define EISA_IRQ_REGION		0 /* region 0 needs to be reserved for EISA */
43#define EISA_MAX_IRQS		16 /* max. (E)ISA irq line */
44
45struct irq_region_ops {
46	void (*disable_irq)(void *dev, int irq);
47	void (* enable_irq)(void *dev, int irq);
48	void (*   mask_irq)(void *dev, int irq);
49	void (* unmask_irq)(void *dev, int irq);
50};
51
52struct irq_region_data {
53	void *dev;
54	const char *name;
55	int irqbase;
56	unsigned int status[IRQ_PER_REGION]; /* IRQ status */
57};
58
59struct irq_region {
60	struct irq_region_ops ops;
61	struct irq_region_data data;
62
63	struct irqaction *action;
64};
65
66extern struct irq_region *irq_region[NR_IRQ_REGS];
67
68static __inline__ int irq_cannonicalize(int irq)
69{
70#ifdef CONFIG_EISA
71	return (irq == (IRQ_FROM_REGION(EISA_IRQ_REGION)+2)
72		? (IRQ_FROM_REGION(EISA_IRQ_REGION)+9) : irq);
73#else
74	return irq;
75#endif
76}
77
78extern void disable_irq(int);
79#define disable_irq_nosync(i) disable_irq(i)
80extern void enable_irq(int);
81
82extern void do_irq(struct irqaction *a, int i, struct pt_regs *p);
83extern void do_irq_mask(unsigned long mask, struct irq_region *region,
84	struct pt_regs *regs);
85
86extern struct irq_region *alloc_irq_region(int count, struct irq_region_ops *ops,
87	const char *name, void *dev);
88
89extern int txn_alloc_irq(void);
90extern int txn_claim_irq(int);
91extern unsigned int txn_alloc_data(int, unsigned int);
92extern unsigned long txn_alloc_addr(int);
93
94/* soft power switch support (power.c) */
95extern struct tasklet_struct power_tasklet;
96
97#endif	/* _ASM_PARISC_IRQ_H */
98