LXR linux/arch/m68k/mac/baboon.c

   1/*
   2 * Baboon Custom IC Management
   3 *
   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.
   7 */
   8
   9#include <linux/types.h>
  10#include <linux/kernel.h>
  11#include <linux/irq.h>
  12
  13#include <asm/macintosh.h>
  14#include <asm/macints.h>
  15#include <asm/mac_baboon.h>
  16
  17/* #define DEBUG_IRQS */
  18
  19int baboon_present;
  20static volatile struct baboon *baboon;
  21
  22#if 0
  23extern int macide_ack_intr(struct ata_channel *);
  24#endif
  25
  26/*
  27 * Baboon initialization.
  28 */
  29
  30void __init baboon_init(void)
  31{
  32        if (macintosh_config->ident != MAC_MODEL_PB190) {
  33                baboon = NULL;
  34                baboon_present = 0;
  35                return;
  36        }
  37
  38        baboon = (struct baboon *) BABOON_BASE;
  39        baboon_present = 1;
  40
  41        printk("Baboon detected at %p\n", baboon);
  42}
  43
  44/*
  45 * Baboon interrupt handler. This works a lot like a VIA.
  46 */
  47
  48static void baboon_irq(unsigned int irq, struct irq_desc *desc)
  49{
  50        int irq_bit, irq_num;
  51        unsigned char events;
  52
  53#ifdef DEBUG_IRQS
  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);
  57#endif
  58
  59        events = baboon->mb_ifr & 0x07;
  60        if (!events)
  61                return;
  62
  63        irq_num = IRQ_BABOON_0;
  64        irq_bit = 1;
  65        do {
  66                if (events & irq_bit) {
  67                        baboon->mb_ifr &= ~irq_bit;
  68                        generic_handle_irq(irq_num);
  69                }
  70                irq_bit <<= 1;
  71                irq_num++;
  72        } while(events >= irq_bit);
  73#if 0
  74        if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
  75        /* for now we need to smash all interrupts */
  76        baboon->mb_ifr &= ~events;
  77#endif
  78}
  79
  80/*
  81 * Register the Baboon interrupt dispatcher on nubus slot $C.
  82 */
  83
  84void __init baboon_register_interrupts(void)
  85{
  86        irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
  87}
  88
  89/*
  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).
  96 */
  97
  98void baboon_irq_enable(int irq)
  99{
 100#ifdef DEBUG_IRQUSE
 101        printk("baboon_irq_enable(%d)\n", irq);
 102#endif
 103
 104        mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
 105}
 106
 107void baboon_irq_disable(int irq)
 108{
 109#ifdef DEBUG_IRQUSE
 110        printk("baboon_irq_disable(%d)\n", irq);
 111#endif
 112
 113        mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
 114}
 115