m68k/mac/macints.c

1 // SPDX-License-Identifier: GPL-2.0
7  * exclusively use the autovector interrupts (the 'generic level0-level7'
8  * interrupts with exception vectors 0x19-0x1f). The following interrupt levels
10  *	1	- VIA1
11  *		  - slot 0: one second interrupt (CA2)
12  *		  - slot 1: VBlank (CA1)
13  *		  - slot 2: ADB data ready (SR full)
14  *		  - slot 3: ADB data  (CB2)
15  *		  - slot 4: ADB clock (CB1)
16  *		  - slot 5: timer 2
17  *		  - slot 6: timer 1
18  *		  - slot 7: status of IRQ; signals 'any enabled int.'
20  *	2	- VIA2 or RBV
21  *		  - slot 0: SCSI DRQ (CA2)
22  *		  - slot 1: NUBUS IRQ (CA1) need to read port A to find which
23  *		  - slot 2: /EXP IRQ (only on IIci)
24  *		  - slot 3: SCSI IRQ (CB2)
25  *		  - slot 4: ASC IRQ (CB1)
26  *		  - slot 5: timer 2 (not on IIci)
27  *		  - slot 6: timer 1 (not on IIci)
28  *		  - slot 7: status of IRQ; signals 'any enabled int.'
30  * Levels 3-6 vary by machine type. For VIA or RBV Macintoshes:
32  *	3	- unused (?)
34  *	4	- SCC
36  *	5	- unused (?)
37  *		  [serial errors or special conditions seem to raise level 6
40  *	6	- off switch (?)
42  * Machines with Quadra-like VIA hardware, except PSC and PMU machines, support
46  *	1	- unused (?)
48  *	3	- on-board SONIC
50  *	5	- Apple Sound Chip (ASC)
52  *	6	- VIA1
57  *	1	- ISM IOP (ADB)
59  *	2	- SCSI
61  *	3	- NuBus
63  *	4	- SCC IOP
65  *	6	- VIA1
69  *	3	- PSC level 3
70  *		  - slot 0: MACE
72  *	4	- PSC level 4
73  *		  - slot 1: SCC channel A interrupt
74  *		  - slot 2: SCC channel B interrupt
75  *		  - slot 3: MACE DMA
77  *	5	- PSC level 5
79  *	6	- PSC level 6
81  * Finally we have good 'ole level 7, the non-maskable interrupt:
83  *	7	- NMI (programmer's switch on the back of some Macs)
88  * - We install dispatchers for the autovector interrupts (1-7). These
92  *   index of the interrupt hardware into the low three bits and the original
96  * - Nubus is a special case because its interrupts are hidden behind two
99  *   dispatcher. This dispatcher finds the interrupting slot number (9-F) and
101  *   minus 9 in the low three bits and the pseudo-level 7 in the upper five
103  *   called. This puts Nubus interrupts into the range 56-62.
105  * - The Baboon interrupts (used on some PowerBooks) are an even more special
150 	pr_info("Non-Maskable Interrupt\n");  in mac_nmi_handler()
160 				  NUM_MAC_SOURCES - IRQ_USER);  in mac_init_IRQ()
164 	 * at levels 1-7. Most of the work is done elsewhere.  in mac_init_IRQ()
182  *  mac_irq_enable - enable an interrupt source
183  * mac_irq_disable - disable an interrupt source
190 	int irq = data->irq;  in mac_irq_enable()
220 	int irq = data->irq;  in mac_irq_disable()
250 	int irq = data->irq;  in mac_irq_startup()
262 	int irq = data->irq;  in mac_irq_shutdown()