89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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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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int baboon_present;
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static volatile struct baboon *baboon;
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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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pr_debug("Baboon detected at %p\n", baboon);
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}
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/*
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* Baboon interrupt handler.
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* XXX how do you clear a pending IRQ? is it even necessary?
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*/
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static void baboon_irq(struct irq_desc *desc)
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{
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short events, irq_bit;
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int irq_num;
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events = baboon->mb_ifr & 0x07;
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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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events &= ~irq_bit;
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generic_handle_irq(irq_num);
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}
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++irq_num;
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irq_bit <<= 1;
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} while (events);
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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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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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mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
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}
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