/*
* Copyright IBM Corp. 2002, 2007
* Author(s): Ingo Adlung <[email protected]>
* Cornelia Huck <[email protected]>
* Arnd Bergmann <[email protected]>
* Peter Oberparleiter <[email protected]>
*/

#ifndef _ASM_S390_AIRQ_H
#define _ASM_S390_AIRQ_H

#include <linux/bit_spinlock.h>

struct airq_struct {
struct hlist_node list; /* Handler queueing. */
void (*handler)(struct airq_struct *); /* Thin-interrupt handler */
u8 *lsi_ptr; /* Local-Summary-Indicator pointer */
u8 lsi_mask; /* Local-Summary-Indicator mask */
u8 isc; /* Interrupt-subclass */
u8 flags;
};

#define AIRQ_PTR_ALLOCATED 0x01

int register_adapter_interrupt(struct airq_struct *airq);
void unregister_adapter_interrupt(struct airq_struct *airq);

/* Adapter interrupt bit vector */
struct airq_iv {
unsigned long *vector; /* Adapter interrupt bit vector */
unsigned long *avail; /* Allocation bit mask for the bit vector */
unsigned long *bitlock; /* Lock bit mask for the bit vector */
unsigned long *ptr; /* Pointer associated with each bit */
unsigned int *data; /* 32 bit value associated with each bit */
unsigned long bits; /* Number of bits in the vector */
unsigned long end; /* Number of highest allocated bit + 1 */
spinlock_t lock; /* Lock to protect alloc & free */
};

#define AIRQ_IV_ALLOC 1 /* Use an allocation bit mask */
#define AIRQ_IV_BITLOCK 2 /* Allocate the lock bit mask */
#define AIRQ_IV_PTR 4 /* Allocate the ptr array */
#define AIRQ_IV_DATA 8 /* Allocate the data array */

struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
void airq_iv_release(struct airq_iv *iv);
unsigned long airq_iv_alloc_bit(struct airq_iv *iv);
void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit);
unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
unsigned long end);

static inline unsigned long airq_iv_end(struct airq_iv *iv)
{
return iv->end;
}

static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
{
const unsigned long be_to_le = BITS_PER_LONG - 1;
bit_spin_lock(bit ^ be_to_le, iv->bitlock);
}

static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
{
const unsigned long be_to_le = BITS_PER_LONG - 1;
bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
}

static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
unsigned int data)
{
iv->data[bit] = data;
}

static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
unsigned long bit)
{
return iv->data[bit];
}

static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
unsigned long ptr)
{
iv->ptr[bit] = ptr;
}

static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
unsigned long bit)
{
return iv->ptr[bit];
}

#endif /* _ASM_S390_AIRQ_H */