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macints.h

/*
** macints.h -- Macintosh Linux interrupt handling structs and prototypes
**
** Copyright 1997 by Michael Schmitz
**
** This file is subject to the terms and conditions of the GNU General Public
** License.  See the file COPYING in the main directory of this archive
** for more details.
**
*/

#ifndef _ASM_MACINTS_H_
#define _ASM_MACINTS_H_

#include <asm/irq.h>

/* Setting this prints debugging info for unclaimed interrupts */

#define DEBUG_SPURIOUS

/* Setting this prints debugging info on each autovector interrupt */

/* #define DEBUG_IRQS */

/* Setting this prints debugging info on each Nubus interrupt */

/* #define DEBUG_NUBUS_INT */

/* Setting this prints debugging info on irqs as they enabled and disabled. */

/* #define DEBUG_IRQUSE */

/*
 * Base IRQ number for all Mac68K interrupt sources. Each source
 * has eight indexes (base -> base+7).
 */

#define VIA1_SOURCE_BASE      8
#define VIA2_SOURCE_BASE      16
#define PSC3_SOURCE_BASE      24
#define PSC4_SOURCE_BASE      32
#define PSC5_SOURCE_BASE      40
#define PSC6_SOURCE_BASE      48
#define NUBUS_SOURCE_BASE     56
#define BABOON_SOURCE_BASE    64

/*
 * Maximum IRQ number is BABOON_SOURCE_BASE + 7,
 * giving us IRQs up through 71
 */

#define NUM_MAC_SOURCES       72

/*
 * clean way to separate IRQ into its source and index
 */

#define IRQ_SRC(irq)    (irq >> 3)
#define     IRQ_IDX(irq)      (irq & 7)

/* VIA1 interrupts */
#define IRQ_VIA1_0        (8)       /* one second int. */
#define IRQ_VIA1_1        (9)       /* VBlank int. */
#define IRQ_MAC_VBL       IRQ_VIA1_1
#define IRQ_VIA1_2        (10)            /* ADB SR shifts complete */
#define IRQ_MAC_ADB       IRQ_VIA1_2
#define IRQ_MAC_ADB_SR    IRQ_VIA1_2
#define IRQ_VIA1_3        (11)            /* ADB SR CB2 ?? */
#define IRQ_MAC_ADB_SD    IRQ_VIA1_3
#define IRQ_VIA1_4        (12)            /* ADB SR ext. clock pulse */
#define IRQ_MAC_ADB_CL    IRQ_VIA1_4
#define IRQ_VIA1_5        (13)
#define IRQ_MAC_TIMER_2   IRQ_VIA1_5
#define IRQ_VIA1_6        (14)
#define IRQ_MAC_TIMER_1   IRQ_VIA1_6
#define IRQ_VIA1_7        (15)

/* VIA2/RBV interrupts */
#define IRQ_VIA2_0        (16)
#define IRQ_MAC_SCSIDRQ   IRQ_VIA2_0
#define IRQ_VIA2_1        (17)
#define IRQ_MAC_NUBUS     IRQ_VIA2_1
#define IRQ_VIA2_2        (18)
#define IRQ_VIA2_3        (19)
#define IRQ_MAC_SCSI      IRQ_VIA2_3
#define IRQ_VIA2_4        (20)
#define IRQ_VIA2_5        (21)
#define IRQ_VIA2_6        (22)
#define IRQ_VIA2_7        (23)

/* Level 3 (PSC, AV Macs only) interrupts */
#define IRQ_PSC3_0        (24)
#define IRQ_MAC_MACE      IRQ_PSC3_0
#define IRQ_PSC3_1        (25)
#define IRQ_PSC3_2        (26)
#define IRQ_PSC3_3        (27)

/* Level 4 (PSC, AV Macs only) interrupts */
#define IRQ_PSC4_0        (32)
#define IRQ_PSC4_1        (33)
#define IRQ_MAC_SCC_A     IRQ_PSC4_1
#define IRQ_PSC4_2        (34)
#define IRQ_MAC_SCC_B     IRQ_PSC4_2
#define IRQ_PSC4_3        (35)
#define IRQ_MAC_MACE_DMA  IRQ_PSC4_3

/* Level 5 (PSC, AV Macs only) interrupts */
#define IRQ_PSC5_0        (40)
#define IRQ_PSC5_1        (41)
#define IRQ_PSC5_2        (42)
#define IRQ_PSC5_3        (43)

/* Level 6 (PSC, AV Macs only) interrupts */
#define IRQ_PSC6_0        (48)
#define IRQ_PSC6_1        (49)
#define IRQ_PSC6_2        (50)
#define IRQ_PSC6_3        (51)

/* Nubus interrupts (cascaded to VIA2) */
#define IRQ_NUBUS_9       (56)
#define IRQ_NUBUS_A       (57)
#define IRQ_NUBUS_B       (58)
#define IRQ_NUBUS_C       (59)
#define IRQ_NUBUS_D       (60)
#define IRQ_NUBUS_E       (61)
#define IRQ_NUBUS_F       (62)

/* Baboon interrupts (cascaded to nubus slot $C) */
#define IRQ_BABOON_0      (64)
#define IRQ_BABOON_1      (65)
#define IRQ_BABOON_2      (66)
#define IRQ_BABOON_3      (67)

/* On non-PSC machines, the serial ports share an IRQ */
#define IRQ_MAC_SCC       IRQ_AUTO_4

#define SLOT2IRQ(x)       (x + 47)
#define IRQ2SLOT(x)       (x - 47)

#define INT_CLK   24576     /* CLK while int_clk =2.456MHz and divide = 100 */
#define INT_TICKS 246       /* to make sched_time = 99.902... HZ */

#endif /* asm/macints.h */

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