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/*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* i8259.h i8259 PIC Registers */
#ifndef _ASMI386_I8259_H_
#define _ASMI386_I8959_H_ 1
/* PIC I/O mapped registers */
#define IRR 0x0 /* Interrupt Request Register */
#define ISR 0x0 /* In-Service Register */
#define ICW1 0x0 /* Initialization Control Word 1 */
#define OCW2 0x0 /* Operation Control Word 2 */
#define OCW3 0x0 /* Operation Control Word 3 */
#define ICW2 0x1 /* Initialization Control Word 2 */
#define ICW3 0x1 /* Initialization Control Word 3 */
#define ICW4 0x1 /* Initialization Control Word 4 */
#define IMR 0x1 /* Interrupt Mask Register */
/* bits for IRR, IMR, ISR and ICW3 */
#define IR7 0x80 /* IR7 */
#define IR6 0x40 /* IR6 */
#define IR5 0x20 /* IR5 */
#define IR4 0x10 /* IR4 */
#define IR3 0x08 /* IR3 */
#define IR2 0x04 /* IR2 */
#define IR1 0x02 /* IR1 */
#define IR0 0x01 /* IR0 */
/* bits for SEOI */
#define SEOI_IR7 0x07 /* IR7 */
#define SEOI_IR6 0x06 /* IR6 */
#define SEOI_IR5 0x05 /* IR5 */
#define SEOI_IR4 0x04 /* IR4 */
#define SEOI_IR3 0x03 /* IR3 */
#define SEOI_IR2 0x02 /* IR2 */
#define SEOI_IR1 0x01 /* IR1 */
#define SEOI_IR0 0x00 /* IR0 */
/* OCW2 bits */
#define OCW2_RCLR 0x00 /* Rotate/clear */
#define OCW2_NEOI 0x20 /* Non specific EOI */
#define OCW2_NOP 0x40 /* NOP */
#define OCW2_SEOI 0x60 /* Specific EOI */
#define OCW2_RSET 0x80 /* Rotate/set */
#define OCW2_REOI 0xA0 /* Rotate on non specific EOI */
#define OCW2_PSET 0xC0 /* Priority Set Command */
#define OCW2_RSEOI 0xE0 /* Rotate on specific EOI */
/* ICW1 bits */
#define ICW1_SEL 0x10 /* Select ICW1 */
#define ICW1_LTIM 0x08 /* Level-Triggered Interrupt Mode */
#define ICW1_ADI 0x04 /* Address Interval */
#define ICW1_SNGL 0x02 /* Single PIC */
#define ICW1_EICW4 0x01 /* Expect initilization ICW4 */
/* ICW2 is the starting vector number */
/* ICW2 is bit-mask of present slaves for a master device,
* or the slave ID for a slave device */
/* ICW4 bits */
#define ICW4_AEOI 0x02 /* Automatic EOI Mode */
#define ICW4_PM 0x01 /* Microprocessor Mode */
int i8259_init(void);
#endif
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