1/*
2 *    Copyright IBM Corp. 2002, 2007
3 *    Author(s): Ingo Adlung <adlung@de.ibm.com>
4 *		 Cornelia Huck <cornelia.huck@de.ibm.com>
5 *		 Arnd Bergmann <arndb@de.ibm.com>
6 *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
7 */
8
9#ifndef _ASM_S390_AIRQ_H
10#define _ASM_S390_AIRQ_H
11
12#include <linux/bit_spinlock.h>
13
14struct airq_struct {
15	struct hlist_node list;		/* Handler queueing. */
16	void (*handler)(struct airq_struct *);	/* Thin-interrupt handler */
17	u8 *lsi_ptr;			/* Local-Summary-Indicator pointer */
18	u8 lsi_mask;			/* Local-Summary-Indicator mask */
19	u8 isc;				/* Interrupt-subclass */
20	u8 flags;
21};
22
23#define AIRQ_PTR_ALLOCATED	0x01
24
25int register_adapter_interrupt(struct airq_struct *airq);
26void unregister_adapter_interrupt(struct airq_struct *airq);
27
28/* Adapter interrupt bit vector */
29struct airq_iv {
30	unsigned long *vector;	/* Adapter interrupt bit vector */
31	unsigned long *avail;	/* Allocation bit mask for the bit vector */
32	unsigned long *bitlock;	/* Lock bit mask for the bit vector */
33	unsigned long *ptr;	/* Pointer associated with each bit */
34	unsigned int *data;	/* 32 bit value associated with each bit */
35	unsigned long bits;	/* Number of bits in the vector */
36	unsigned long end;	/* Number of highest allocated bit + 1 */
37	spinlock_t lock;	/* Lock to protect alloc & free */
38};
39
40#define AIRQ_IV_ALLOC	1	/* Use an allocation bit mask */
41#define AIRQ_IV_BITLOCK	2	/* Allocate the lock bit mask */
42#define AIRQ_IV_PTR	4	/* Allocate the ptr array */
43#define AIRQ_IV_DATA	8	/* Allocate the data array */
44
45struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
46void airq_iv_release(struct airq_iv *iv);
47unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
48void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
49unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
50			   unsigned long end);
51
52static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
53{
54	return airq_iv_alloc(iv, 1);
55}
56
57static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
58{
59	airq_iv_free(iv, bit, 1);
60}
61
62static inline unsigned long airq_iv_end(struct airq_iv *iv)
63{
64	return iv->end;
65}
66
67static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
68{
69	const unsigned long be_to_le = BITS_PER_LONG - 1;
70	bit_spin_lock(bit ^ be_to_le, iv->bitlock);
71}
72
73static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
74{
75	const unsigned long be_to_le = BITS_PER_LONG - 1;
76	bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
77}
78
79static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
80				    unsigned int data)
81{
82	iv->data[bit] = data;
83}
84
85static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
86					    unsigned long bit)
87{
88	return iv->data[bit];
89}
90
91static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
92				   unsigned long ptr)
93{
94	iv->ptr[bit] = ptr;
95}
96
97static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
98					    unsigned long bit)
99{
100	return iv->ptr[bit];
101}
102
103#endif /* _ASM_S390_AIRQ_H */
104