1/*
2 * Baboon Custom IC Management
3 *
4 * The Baboon custom IC controls the IDE, PCMCIA and media bay on the
5 * PowerBook 190. It multiplexes multiple interrupt sources onto the
6 * Nubus slot $C interrupt.
7 */
8
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/irq.h>
12
13#include <asm/macintosh.h>
14#include <asm/macints.h>
15#include <asm/mac_baboon.h>
16
17/* #define DEBUG_IRQS */
18
19int baboon_present;
20static volatile struct baboon *baboon;
21
22#if 0
23extern int macide_ack_intr(struct ata_channel *);
24#endif
25
26/*
27 * Baboon initialization.
28 */
29
30void __init baboon_init(void)
31{
32	if (macintosh_config->ident != MAC_MODEL_PB190) {
33		baboon = NULL;
34		baboon_present = 0;
35		return;
36	}
37
38	baboon = (struct baboon *) BABOON_BASE;
39	baboon_present = 1;
40
41	printk("Baboon detected at %p\n", baboon);
42}
43
44/*
45 * Baboon interrupt handler. This works a lot like a VIA.
46 */
47
48static void baboon_irq(struct irq_desc *desc)
49{
50	int irq_bit, irq_num;
51	unsigned char events;
52
53#ifdef DEBUG_IRQS
54	printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
55		(uint) baboon->mb_control, (uint) baboon->mb_ifr,
56		(uint) baboon->mb_status);
57#endif
58
59	events = baboon->mb_ifr & 0x07;
60	if (!events)
61		return;
62
63	irq_num = IRQ_BABOON_0;
64	irq_bit = 1;
65	do {
66	        if (events & irq_bit) {
67			baboon->mb_ifr &= ~irq_bit;
68			generic_handle_irq(irq_num);
69		}
70		irq_bit <<= 1;
71		irq_num++;
72	} while(events >= irq_bit);
73#if 0
74	if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
75	/* for now we need to smash all interrupts */
76	baboon->mb_ifr &= ~events;
77#endif
78}
79
80/*
81 * Register the Baboon interrupt dispatcher on nubus slot $C.
82 */
83
84void __init baboon_register_interrupts(void)
85{
86	irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
87}
88
89/*
90 * The means for masking individual Baboon interrupts remains a mystery.
91 * However, since we only use the IDE IRQ, we can just enable/disable all
92 * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must
93 * either figure out how to mask them individually or else implement the
94 * same workaround that's used for NuBus slots (see nubus_disabled and
95 * via_nubus_irq_shutdown).
96 */
97
98void baboon_irq_enable(int irq)
99{
100#ifdef DEBUG_IRQUSE
101	printk("baboon_irq_enable(%d)\n", irq);
102#endif
103
104	mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
105}
106
107void baboon_irq_disable(int irq)
108{
109#ifdef DEBUG_IRQUSE
110	printk("baboon_irq_disable(%d)\n", irq);
111#endif
112
113	mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
114}
115