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>
11 #include <linux/irq.h>
13 #include <asm/macintosh.h>
14 #include <asm/macints.h>
15 #include <asm/mac_baboon.h>
17 /* #define DEBUG_IRQS */
20 static volatile struct baboon *baboon;
23 extern int macide_ack_intr(struct ata_channel *);
27 * Baboon initialization.
30 void __init baboon_init(void)
32 if (macintosh_config->ident != MAC_MODEL_PB190) {
38 baboon = (struct baboon *) BABOON_BASE;
41 printk("Baboon detected at %p\n", baboon);
45 * Baboon interrupt handler. This works a lot like a VIA.
48 static void baboon_irq(unsigned int irq, struct irq_desc *desc)
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);
59 events = baboon->mb_ifr & 0x07;
63 irq_num = IRQ_BABOON_0;
66 if (events & irq_bit) {
67 baboon->mb_ifr &= ~irq_bit;
68 generic_handle_irq(irq_num);
72 } while(events >= irq_bit);
74 if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
75 /* for now we need to smash all interrupts */
76 baboon->mb_ifr &= ~events;
81 * Register the Baboon interrupt dispatcher on nubus slot $C.
84 void __init baboon_register_interrupts(void)
86 irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
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).
98 void baboon_irq_enable(int irq)
101 printk("baboon_irq_enable(%d)\n", irq);
104 mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
107 void baboon_irq_disable(int irq)
110 printk("baboon_irq_disable(%d)\n", irq);
113 mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));