127 lines
2.6 KiB
C
127 lines
2.6 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/mm.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/ide.h>
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#include <asm/traps.h>
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#include <asm/bootinfo.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_BABOON */
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/* #define DEBUG_IRQS */
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int baboon_present,baboon_active;
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volatile struct baboon *baboon;
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irqreturn_t baboon_irq(int, void *, struct pt_regs *);
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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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baboon_active = 0;
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printk("Baboon detected at %p\n", baboon);
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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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request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
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"baboon", (void *) 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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irqreturn_t baboon_irq(int irq, void *dev_id, struct pt_regs *regs)
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{
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int irq_bit,i;
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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 active %02X\n",
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(uint) baboon->mb_control, (uint) baboon->mb_ifr,
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(uint) baboon->mb_status, baboon_active);
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#endif
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if (!(events = baboon->mb_ifr & 0x07))
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return IRQ_NONE;
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for (i = 0, irq_bit = 1 ; i < 3 ; i++, irq_bit <<= 1) {
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if (events & irq_bit/* & baboon_active*/) {
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baboon_active &= ~irq_bit;
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mac_do_irq_list(IRQ_BABOON_0 + i, regs);
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baboon_active |= irq_bit;
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baboon->mb_ifr &= ~irq_bit;
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}
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}
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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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return IRQ_HANDLED;
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}
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void baboon_irq_enable(int irq) {
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int irq_idx = IRQ_IDX(irq);
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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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baboon_active |= (1 << irq_idx);
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}
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void baboon_irq_disable(int irq) {
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int irq_idx = IRQ_IDX(irq);
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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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baboon_active &= ~(1 << irq_idx);
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}
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void baboon_irq_clear(int irq) {
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int irq_idx = IRQ_IDX(irq);
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baboon->mb_ifr &= ~(1 << irq_idx);
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}
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int baboon_irq_pending(int irq)
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{
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int irq_idx = IRQ_IDX(irq);
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return baboon->mb_ifr & (1 << irq_idx);
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}
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