source: GPL/trunk/include/linux/interrupt.h@ 692

Last change on this file since 692 was 679, checked in by David Azarewicz, 5 years ago

Merge changes from Paul's uniaud32next branch.
File size: 4.7 KB
Line 
1/* interrupt.h */
2#ifndef _LINUX_INTERRUPT_H
3#define _LINUX_INTERRUPT_H
4
5#include <linux/kernel.h>
6#include <linux/bitops.h>
7#include <asm/atomic.h>
8#include <asm/hardirq.h>
9#include <linux/workqueue.h>
10
11/*
12 * For 2.4.x compatibility, 2.4.x can use
13 *
14 * typedef void irqreturn_t;
15 * #define IRQ_NONE
16 * #define IRQ_HANDLED
17 * #define IRQ_RETVAL(x)
18 *
19 * To mix old-style and new-style irq handler returns.
20 *
21 * IRQ_NONE means we didn't handle it.
22 * IRQ_HANDLED means that we did have a valid interrupt and handled it.
23 * IRQ_RETVAL(x) selects on the two depending on x being non-zero (for handled)
24 */
25typedef int irqreturn_t;
26
27#define IRQ_NONE (0)
28#define IRQ_HANDLED (1)
29#define IRQ_RETVAL(x) ((x) != 0)
30
31#include <linux/signal.h>
32#define IRQF_SHARED SA_SHIRQ
33#define IRQF_DISABLED SA_INTERRUPT
34#define IRQF_SAMPLE_RANDOM SA_SAMPLE_RANDOM
35#define IRQF_PERCPU SA_PERCPU
36#ifdef SA_PROBEIRQ
37#define IRQF_PROBE_SHARED SA_PROBEIRQ
38#else
39#define IRQF_PROBE_SHARED 0 /* dummy */
40#endif
41
42struct irqaction {
43 void (*handler)(int, void *, struct pt_regs *);
44 unsigned long flags;
45 unsigned long mask;
46 const char *name;
47 void *dev_id;
48 struct irqaction *next;
49};
50
51extern volatile unsigned char bh_running;
52
53extern atomic_t bh_mask_count[32];
54extern unsigned long bh_active;
55extern unsigned long bh_mask;
56extern void (*bh_base[32])(void);
57
58void do_bottom_half(void);
59
60/* Who gets which entry in bh_base. Things which will occur most often
61 should come first - in which case NET should be up the top with SERIAL/TQUEUE! */
62
63enum {
64 TIMER_BH = 0,
65 CONSOLE_BH,
66 TQUEUE_BH,
67 DIGI_BH,
68 SERIAL_BH,
69 RISCOM8_BH,
70 SPECIALIX_BH,
71 AURORA_BH,
72 ESP_BH,
73 NET_BH,
74 SCSI_BH,
75 IMMEDIATE_BH,
76 KEYBOARD_BH,
77 CYCLADES_BH,
78 CM206_BH,
79 JS_BH,
80 MACSERIAL_BH,
81 ISICOM_BH
82};
83/* Tasklets --- multithreaded analogue of BHs.
84
85 Main feature differing them of generic softirqs: tasklet
86 is running only on one CPU simultaneously.
87
88 Main feature differing them of BHs: different tasklets
89 may be run simultaneously on different CPUs.
90
91 Properties:
92 * If tasklet_schedule() is called, then tasklet is guaranteed
93 to be executed on some cpu at least once after this.
94 * If the tasklet is already scheduled, but its excecution is still not
95 started, it will be executed only once.
96 * If this tasklet is already running on another CPU (or schedule is called
97 from tasklet itself), it is rescheduled for later.
98 * Tasklet is strictly serialized wrt itself, but not
99 wrt another tasklets. If client needs some intertask synchronization,
100 he makes it with spinlocks.
101 */
102
103struct tasklet_struct {
104 struct tasklet_struct *next; /* linked list of active bh's */
105 unsigned long sync; /* must be initialized to zero */
106 void (*func)(void *); /* function to call */
107 void *data; /* argument to function */
108};
109
110extern void tasklet_hi_schedule(struct tasklet_struct *t);
111
112#define tasklet_schedule tasklet_hi_schedule
113
114extern void tasklet_init(struct tasklet_struct *t,
115 void (*func)(unsigned long), unsigned long data);
116
117/*
118 * Autoprobing for irqs:
119 *
120 * probe_irq_on() and probe_irq_off() provide robust primitives
121 * for accurate IRQ probing during kernel initialization. They are
122 * reasonably simple to use, are not "fooled" by spurious interrupts,
123 * and, unlike other attempts at IRQ probing, they do not get hung on
124 * stuck interrupts (such as unused PS2 mouse interfaces on ASUS boards).
125 *
126 * For reasonably foolproof probing, use them as follows:
127 *
128 * 1. clear and/or mask the device's internal interrupt.
129 * 2. sti();
130 * 3. irqs = probe_irq_on(); // "take over" all unassigned idle IRQs
131 * 4. enable the device and cause it to trigger an interrupt.
132 * 5. wait for the device to interrupt, using non-intrusive polling or a delay.
133 * 6. irq = probe_irq_off(irqs); // get IRQ number, 0=none, negative=multiple
134 * 7. service the device to clear its pending interrupt.
135 * 8. loop again if paranoia is required.
136 *
137 * probe_irq_on() returns a mask of allocated irq's.
138 *
139 * probe_irq_off() takes the mask as a parameter,
140 * and returns the irq number which occurred,
141 * or zero if none occurred, or a negative irq number
142 * if more than one irq occurred.
143 */
144extern unsigned long probe_irq_on(void); /* returns 0 on failure */
145extern int probe_irq_off(unsigned long); /* returns 0 or negative on failure */
146
147typedef irqreturn_t (*snd_irq_handler_t)(int, void *);
148#define irq_handler_t snd_irq_handler_t
149#undef irq_handler_t
150#define irq_handler_t snd_irq_handler_t
151
152int request_irq(unsigned int, irq_handler_t handler,
153 unsigned long, const char *, void *);
154
155static inline void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id) {}
156#endif
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