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/mm.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14
15 #include <asm/traps.h>
16 #include <asm/bootinfo.h>
17 #include <asm/macintosh.h>
18 #include <asm/macints.h>
19 #include <asm/mac_baboon.h>
20
21 /* #define DEBUG_IRQS */
22
23 extern void mac_enable_irq(unsigned int);
24 extern void mac_disable_irq(unsigned int);
25
26 int baboon_present;
27 static volatile struct baboon *baboon;
28 static unsigned char baboon_disabled;
29
30 #if 0
31 extern int macide_ack_intr(struct ata_channel *);
32 #endif
33
34 /*
35 * Baboon initialization.
36 */
37
baboon_init(void)38 void __init baboon_init(void)
39 {
40 if (macintosh_config->ident != MAC_MODEL_PB190) {
41 baboon = NULL;
42 baboon_present = 0;
43 return;
44 }
45
46 baboon = (struct baboon *) BABOON_BASE;
47 baboon_present = 1;
48
49 printk("Baboon detected at %p\n", baboon);
50 }
51
52 /*
53 * Baboon interrupt handler. This works a lot like a VIA.
54 */
55
baboon_irq(int irq,void * dev_id)56 static irqreturn_t baboon_irq(int irq, void *dev_id)
57 {
58 int irq_bit, irq_num;
59 unsigned char events;
60
61 #ifdef DEBUG_IRQS
62 printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
63 (uint) baboon->mb_control, (uint) baboon->mb_ifr,
64 (uint) baboon->mb_status);
65 #endif
66
67 if (!(events = baboon->mb_ifr & 0x07))
68 return IRQ_NONE;
69
70 irq_num = IRQ_BABOON_0;
71 irq_bit = 1;
72 do {
73 if (events & irq_bit) {
74 baboon->mb_ifr &= ~irq_bit;
75 m68k_handle_int(irq_num);
76 }
77 irq_bit <<= 1;
78 irq_num++;
79 } while(events >= irq_bit);
80 #if 0
81 if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
82 /* for now we need to smash all interrupts */
83 baboon->mb_ifr &= ~events;
84 #endif
85 return IRQ_HANDLED;
86 }
87
88 /*
89 * Register the Baboon interrupt dispatcher on nubus slot $C.
90 */
91
baboon_register_interrupts(void)92 void __init baboon_register_interrupts(void)
93 {
94 baboon_disabled = 0;
95 if (request_irq(IRQ_NUBUS_C, baboon_irq, 0, "baboon", (void *)baboon))
96 pr_err("Couldn't register baboon interrupt\n");
97 }
98
99 /*
100 * The means for masking individual baboon interrupts remains a mystery, so
101 * enable the umbrella interrupt only when no baboon interrupt is disabled.
102 */
103
baboon_irq_enable(int irq)104 void baboon_irq_enable(int irq)
105 {
106 int irq_idx = IRQ_IDX(irq);
107
108 #ifdef DEBUG_IRQUSE
109 printk("baboon_irq_enable(%d)\n", irq);
110 #endif
111
112 baboon_disabled &= ~(1 << irq_idx);
113 if (!baboon_disabled)
114 mac_enable_irq(IRQ_NUBUS_C);
115 }
116
baboon_irq_disable(int irq)117 void baboon_irq_disable(int irq)
118 {
119 int irq_idx = IRQ_IDX(irq);
120
121 #ifdef DEBUG_IRQUSE
122 printk("baboon_irq_disable(%d)\n", irq);
123 #endif
124
125 baboon_disabled |= 1 << irq_idx;
126 if (baboon_disabled)
127 mac_disable_irq(IRQ_NUBUS_C);
128 }
129
baboon_irq_clear(int irq)130 void baboon_irq_clear(int irq)
131 {
132 int irq_idx = IRQ_IDX(irq);
133
134 baboon->mb_ifr &= ~(1 << irq_idx);
135 }
136
baboon_irq_pending(int irq)137 int baboon_irq_pending(int irq)
138 {
139 int irq_idx = IRQ_IDX(irq);
140
141 return baboon->mb_ifr & (1 << irq_idx);
142 }
143