2 * Baboon Custom IC Management
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.
9 #include <linux/types.h>
10 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/irq.h>
16 #include <asm/traps.h>
17 #include <asm/bootinfo.h>
18 #include <asm/macintosh.h>
19 #include <asm/macints.h>
20 #include <asm/mac_baboon.h>
22 /* #define DEBUG_IRQS */
24 extern void mac_enable_irq(unsigned int);
25 extern void mac_disable_irq(unsigned int);
28 static volatile struct baboon *baboon;
29 static unsigned char baboon_disabled;
32 extern int macide_ack_intr(struct ata_channel *);
36 * Baboon initialization.
39 void __init baboon_init(void)
41 if (macintosh_config->ident != MAC_MODEL_PB190) {
47 baboon = (struct baboon *) BABOON_BASE;
50 printk("Baboon detected at %p\n", baboon);
54 * Baboon interrupt handler. This works a lot like a VIA.
57 static void baboon_irq(unsigned int irq, struct irq_desc *desc)
63 printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
64 (uint) baboon->mb_control, (uint) baboon->mb_ifr,
65 (uint) baboon->mb_status);
68 events = baboon->mb_ifr & 0x07;
72 irq_num = IRQ_BABOON_0;
75 if (events & irq_bit) {
76 baboon->mb_ifr &= ~irq_bit;
77 generic_handle_irq(irq_num);
81 } while(events >= irq_bit);
83 if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
84 /* for now we need to smash all interrupts */
85 baboon->mb_ifr &= ~events;
90 * Register the Baboon interrupt dispatcher on nubus slot $C.
93 void __init baboon_register_interrupts(void)
96 irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
100 * The means for masking individual baboon interrupts remains a mystery, so
101 * enable the umbrella interrupt only when no baboon interrupt is disabled.
104 void baboon_irq_enable(int irq)
106 int irq_idx = IRQ_IDX(irq);
109 printk("baboon_irq_enable(%d)\n", irq);
112 baboon_disabled &= ~(1 << irq_idx);
113 if (!baboon_disabled)
114 mac_enable_irq(IRQ_NUBUS_C);
117 void baboon_irq_disable(int irq)
119 int irq_idx = IRQ_IDX(irq);
122 printk("baboon_irq_disable(%d)\n", irq);
125 baboon_disabled |= 1 << irq_idx;
127 mac_disable_irq(IRQ_NUBUS_C);
130 void baboon_irq_clear(int irq)
132 int irq_idx = IRQ_IDX(irq);
134 baboon->mb_ifr &= ~(1 << irq_idx);
137 int baboon_irq_pending(int irq)
139 int irq_idx = IRQ_IDX(irq);
141 return baboon->mb_ifr & (1 << irq_idx);