115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
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/*
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* Baboon Custom IC Management
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*
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* The Baboon custom IC controls the IDE, PCMCIA and media bay on the
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* PowerBook 190. It multiplexes multiple interrupt sources onto the
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* Nubus slot $C interrupt.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/irq.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/mac_baboon.h>
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/* #define DEBUG_IRQS */
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int baboon_present;
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static volatile struct baboon *baboon;
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#if 0
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extern int macide_ack_intr(struct ata_channel *);
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#endif
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/*
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* Baboon initialization.
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*/
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void __init baboon_init(void)
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{
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if (macintosh_config->ident != MAC_MODEL_PB190) {
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baboon = NULL;
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baboon_present = 0;
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return;
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}
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baboon = (struct baboon *) BABOON_BASE;
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baboon_present = 1;
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printk("Baboon detected at %p\n", baboon);
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}
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/*
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* Baboon interrupt handler. This works a lot like a VIA.
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*/
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static void baboon_irq(struct irq_desc *desc)
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{
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int irq_bit, irq_num;
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unsigned char events;
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#ifdef DEBUG_IRQS
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printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
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(uint) baboon->mb_control, (uint) baboon->mb_ifr,
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(uint) baboon->mb_status);
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#endif
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events = baboon->mb_ifr & 0x07;
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if (!events)
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return;
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irq_num = IRQ_BABOON_0;
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irq_bit = 1;
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do {
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if (events & irq_bit) {
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baboon->mb_ifr &= ~irq_bit;
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generic_handle_irq(irq_num);
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}
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irq_bit <<= 1;
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irq_num++;
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} while(events >= irq_bit);
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#if 0
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if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
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/* for now we need to smash all interrupts */
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baboon->mb_ifr &= ~events;
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#endif
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}
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/*
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* Register the Baboon interrupt dispatcher on nubus slot $C.
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*/
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void __init baboon_register_interrupts(void)
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{
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irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
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}
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/*
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* The means for masking individual Baboon interrupts remains a mystery.
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* However, since we only use the IDE IRQ, we can just enable/disable all
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* Baboon interrupts. If/when we handle more than one Baboon IRQ, we must
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* either figure out how to mask them individually or else implement the
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* same workaround that's used for NuBus slots (see nubus_disabled and
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* via_nubus_irq_shutdown).
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*/
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void baboon_irq_enable(int irq)
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{
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#ifdef DEBUG_IRQUSE
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printk("baboon_irq_enable(%d)\n", irq);
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#endif
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mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
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}
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void baboon_irq_disable(int irq)
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{
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#ifdef DEBUG_IRQUSE
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printk("baboon_irq_disable(%d)\n", irq);
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#endif
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mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
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}
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