[mirror_ubuntu-bionic-kernel.git] / arch / x86 / include / asm / i8259.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_I8259_H
#define _ASM_X86_I8259_H

#include <linux/delay.h>

extern unsigned int cached_irq_mask;

#define __byte(x, y)		(((unsigned char *)&(y))[x])
#define cached_master_mask	(__byte(0, cached_irq_mask))
#define cached_slave_mask	(__byte(1, cached_irq_mask))

/* i8259A PIC registers */
#define PIC_MASTER_CMD		0x20
#define PIC_MASTER_IMR		0x21
#define PIC_MASTER_ISR		PIC_MASTER_CMD
#define PIC_MASTER_POLL		PIC_MASTER_ISR
#define PIC_MASTER_OCW3		PIC_MASTER_ISR
#define PIC_SLAVE_CMD		0xa0
#define PIC_SLAVE_IMR		0xa1

/* i8259A PIC related value */
#define PIC_CASCADE_IR		2
#define MASTER_ICW4_DEFAULT	0x01
#define SLAVE_ICW4_DEFAULT	0x01
#define PIC_ICW4_AEOI		2

extern raw_spinlock_t i8259A_lock;

/* the PIC may need a careful delay on some platforms, hence specific calls */
static inline unsigned char inb_pic(unsigned int port)
{
	unsigned char value = inb(port);

	/*
	 * delay for some accesses to PIC on motherboard or in chipset
	 * must be at least one microsecond, so be safe here:
	 */
	udelay(2);

	return value;
}

static inline void outb_pic(unsigned char value, unsigned int port)
{
	outb(value, port);
	/*
	 * delay for some accesses to PIC on motherboard or in chipset
	 * must be at least one microsecond, so be safe here:
	 */
	udelay(2);
}

extern struct irq_chip i8259A_chip;

struct legacy_pic {
	int nr_legacy_irqs;
	struct irq_chip *chip;
	void (*mask)(unsigned int irq);
	void (*unmask)(unsigned int irq);
	void (*mask_all)(void);
	void (*restore_mask)(void);
	void (*init)(int auto_eoi);
	int (*probe)(void);
	int (*irq_pending)(unsigned int irq);
	void (*make_irq)(unsigned int irq);
};

extern struct legacy_pic *legacy_pic;
extern struct legacy_pic null_legacy_pic;

static inline bool has_legacy_pic(void)
{
	return legacy_pic != &null_legacy_pic;
}

static inline int nr_legacy_irqs(void)
{
	return legacy_pic->nr_legacy_irqs;
}

#endif /* _ASM_X86_I8259_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1965aae3 PA	2	#ifndef _ASM_X86_I8259_H
1965aae3 PA	3	#define _ASM_X86_I8259_H
1da177e4	4
bc0a733f DR	5	#include <linux/delay.h>
bc0a733f DR	6
1da177e4 LT	7	extern unsigned int cached_irq_mask;
1da177e4 LT	8
ace4fdbb	9	#define __byte(x, y) (((unsigned char *)&(y))[x])
1da177e4 LT	10	#define cached_master_mask (__byte(0, cached_irq_mask))
	11	#define cached_slave_mask (__byte(1, cached_irq_mask))
	12
f20ebee4 TG	13	/* i8259A PIC registers */
	14	#define PIC_MASTER_CMD 0x20
	15	#define PIC_MASTER_IMR 0x21
	16	#define PIC_MASTER_ISR PIC_MASTER_CMD
	17	#define PIC_MASTER_POLL PIC_MASTER_ISR
	18	#define PIC_MASTER_OCW3 PIC_MASTER_ISR
	19	#define PIC_SLAVE_CMD 0xa0
	20	#define PIC_SLAVE_IMR 0xa1
	21
	22	/* i8259A PIC related value */
	23	#define PIC_CASCADE_IR 2
	24	#define MASTER_ICW4_DEFAULT 0x01
	25	#define SLAVE_ICW4_DEFAULT 0x01
	26	#define PIC_ICW4_AEOI 2
	27
5619c280	28	extern raw_spinlock_t i8259A_lock;
1da177e4	29
bc0a733f DR	30	/* the PIC may need a careful delay on some platforms, hence specific calls */
	31	static inline unsigned char inb_pic(unsigned int port)
	32	{
	33	unsigned char value = inb(port);
	34
	35	/*
	36	* delay for some accesses to PIC on motherboard or in chipset
	37	* must be at least one microsecond, so be safe here:
	38	*/
	39	udelay(2);
	40
	41	return value;
	42	}
	43
	44	static inline void outb_pic(unsigned char value, unsigned int port)
	45	{
	46	outb(value, port);
	47	/*
	48	* delay for some accesses to PIC on motherboard or in chipset
	49	* must be at least one microsecond, so be safe here:
	50	*/
	51	udelay(2);
	52	}
466eed22	53
40bd2174 PM	54	extern struct irq_chip i8259A_chip;
40bd2174 PM	55
ef354866 JP	56	struct legacy_pic {
	57	int nr_legacy_irqs;
	58	struct irq_chip *chip;
4305df94 TG	59	void (*mask)(unsigned int irq);
4305df94 TG	60	void (*unmask)(unsigned int irq);
ef354866 JP	61	void (*mask_all)(void);
	62	void (*restore_mask)(void);
	63	void (*init)(int auto_eoi);
8c058b0b	64	int (*probe)(void);
ef354866 JP	65	int (*irq_pending)(unsigned int irq);
	66	void (*make_irq)(unsigned int irq);
	67	};
	68
	69	extern struct legacy_pic *legacy_pic;
	70	extern struct legacy_pic null_legacy_pic;
	71
faed5cdf PZ	72	static inline bool has_legacy_pic(void)
	73	{
	74	return legacy_pic != &null_legacy_pic;
	75	}
	76
95d76acc JL	77	static inline int nr_legacy_irqs(void)
	78	{
	79	return legacy_pic->nr_legacy_irqs;
	80	}
	81
1965aae3	82	#endif /* _ASM_X86_I8259_H */