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baboon.c

/*
 * Baboon Custom IC Management
 *
 * The Baboon custom IC controls the IDE, PCMCIA and media bay on the
 * PowerBook 190. It multiplexes multiple interrupt sources onto the
 * Nubus slot $C interrupt.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/init.h>

#include <asm/traps.h>
#include <asm/bootinfo.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_baboon.h>

/* #define DEBUG_IRQS */

extern void mac_enable_irq(unsigned int);
extern void mac_disable_irq(unsigned int);

int baboon_present;
static volatile struct baboon *baboon;
static unsigned char baboon_disabled;

#if 0
extern int macide_ack_intr(struct ata_channel *);
#endif

/*
 * Baboon initialization.
 */

void __init baboon_init(void)
{
      if (macintosh_config->ident != MAC_MODEL_PB190) {
            baboon = NULL;
            baboon_present = 0;
            return;
      }

      baboon = (struct baboon *) BABOON_BASE;
      baboon_present = 1;

      printk("Baboon detected at %p\n", baboon);
}

/*
 * Baboon interrupt handler. This works a lot like a VIA.
 */

static irqreturn_t baboon_irq(int irq, void *dev_id)
{
      int irq_bit, irq_num;
      unsigned char events;

#ifdef DEBUG_IRQS
      printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
            (uint) baboon->mb_control, (uint) baboon->mb_ifr,
            (uint) baboon->mb_status);
#endif

      if (!(events = baboon->mb_ifr & 0x07))
            return IRQ_NONE;

      irq_num = IRQ_BABOON_0;
      irq_bit = 1;
      do {
              if (events & irq_bit) {
                  baboon->mb_ifr &= ~irq_bit;
                  m68k_handle_int(irq_num);
            }
            irq_bit <<= 1;
            irq_num++;
      } while(events >= irq_bit);
#if 0
      if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
      /* for now we need to smash all interrupts */
      baboon->mb_ifr &= ~events;
#endif
      return IRQ_HANDLED;
}

/*
 * Register the Baboon interrupt dispatcher on nubus slot $C.
 */

void __init baboon_register_interrupts(void)
{
      baboon_disabled = 0;
      if (request_irq(IRQ_NUBUS_C, baboon_irq, 0, "baboon", (void *)baboon))
            pr_err("Couldn't register baboon interrupt\n");
}

/*
 * The means for masking individual baboon interrupts remains a mystery, so
 * enable the umbrella interrupt only when no baboon interrupt is disabled.
 */

void baboon_irq_enable(int irq)
{
      int irq_idx = IRQ_IDX(irq);

#ifdef DEBUG_IRQUSE
      printk("baboon_irq_enable(%d)\n", irq);
#endif

      baboon_disabled &= ~(1 << irq_idx);
      if (!baboon_disabled)
            mac_enable_irq(IRQ_NUBUS_C);
}

void baboon_irq_disable(int irq)
{
      int irq_idx = IRQ_IDX(irq);

#ifdef DEBUG_IRQUSE
      printk("baboon_irq_disable(%d)\n", irq);
#endif

      baboon_disabled |= 1 << irq_idx;
      if (baboon_disabled)
            mac_disable_irq(IRQ_NUBUS_C);
}

void baboon_irq_clear(int irq)
{
      int irq_idx = IRQ_IDX(irq);

      baboon->mb_ifr &= ~(1 << irq_idx);
}

int baboon_irq_pending(int irq)
{
      int irq_idx = IRQ_IDX(irq);

      return baboon->mb_ifr & (1 << irq_idx);
}

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