1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* Baboon Custom IC Management
*
* The Baboon custom IC controls the IDE, PCMCIA and media bay on the
* PowerBook 190. It multiplexes multiple interrupt sources onto the
* Nubus slot $C interrupt.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/traps.h>
#include <asm/bootinfo.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_baboon.h>
/* #define DEBUG_IRQS */
int baboon_present;
static volatile struct baboon *baboon;
static unsigned char baboon_disabled;
#if 0
extern int macide_ack_intr(struct ata_channel *);
#endif
/*
* Baboon initialization.
*/
void __init baboon_init(void)
{
if (macintosh_config->ident != MAC_MODEL_PB190) {
baboon = NULL;
baboon_present = 0;
return;
}
baboon = (struct baboon *) BABOON_BASE;
baboon_present = 1;
printk("Baboon detected at %p\n", baboon);
}
/*
* Baboon interrupt handler. This works a lot like a VIA.
*/
static void baboon_irq(unsigned int irq, struct irq_desc *desc)
{
int irq_bit, irq_num;
unsigned char events;
#ifdef DEBUG_IRQS
printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
(uint) baboon->mb_control, (uint) baboon->mb_ifr,
(uint) baboon->mb_status);
#endif
events = baboon->mb_ifr & 0x07;
if (!events)
return;
irq_num = IRQ_BABOON_0;
irq_bit = 1;
do {
if (events & irq_bit) {
baboon->mb_ifr &= ~irq_bit;
generic_handle_irq(irq_num);
}
irq_bit <<= 1;
irq_num++;
} while(events >= irq_bit);
#if 0
if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
/* for now we need to smash all interrupts */
baboon->mb_ifr &= ~events;
#endif
}
/*
* Register the Baboon interrupt dispatcher on nubus slot $C.
*/
void __init baboon_register_interrupts(void)
{
baboon_disabled = 0;
irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
}
/*
* The means for masking individual baboon interrupts remains a mystery, so
* enable the umbrella interrupt only when no baboon interrupt is disabled.
*/
void baboon_irq_enable(int irq)
{
int irq_idx = IRQ_IDX(irq);
#ifdef DEBUG_IRQUSE
printk("baboon_irq_enable(%d)\n", irq);
#endif
baboon_disabled &= ~(1 << irq_idx);
if (!baboon_disabled)
mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
}
void baboon_irq_disable(int irq)
{
int irq_idx = IRQ_IDX(irq);
#ifdef DEBUG_IRQUSE
printk("baboon_irq_disable(%d)\n", irq);
#endif
baboon_disabled |= 1 << irq_idx;
if (baboon_disabled)
mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
}
void baboon_irq_clear(int irq)
{
int irq_idx = IRQ_IDX(irq);
baboon->mb_ifr &= ~(1 << irq_idx);
}
int baboon_irq_pending(int irq)
{
int irq_idx = IRQ_IDX(irq);
return baboon->mb_ifr & (1 << irq_idx);
}
|
