Viewing file:  baboon.c (2.53 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* Baboon Custom IC Managment
*
* 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 <linux/ide.h>
#include <asm/traps.h>
#include <asm/bootinfo.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_baboon.h>
/* #define DEBUG_BABOON /**/
/* #define DEBUG_IRQS /**/
int baboon_present,baboon_active;
volatile struct baboon *baboon;
void baboon_irq(int, void *, struct pt_regs *);
extern int macide_ack_intr(ide_hwif_t *);
/*
* 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;
baboon_active = 0;
printk("Baboon detected at %p\n", baboon);
}
/*
* Register the Baboon interrupt dispatcher on nubus slot $C.
*/
void __init baboon_register_interrupts(void)
{
request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
"baboon", (void *) baboon);
}
/*
* Baboon interrupt handler. This works a lot like a VIA.
*/
void baboon_irq(int irq, void *dev_id, struct pt_regs *regs)
{
int irq_bit,i;
unsigned char events;
#ifdef DEBUG_IRQS
printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X active %02X\n",
(uint) baboon->mb_control, (uint) baboon->mb_ifr,
(uint) baboon->mb_status, baboon_active);
#endif
if (!(events = baboon->mb_ifr & 0x07)) return;
for (i = 0, irq_bit = 1 ; i < 3 ; i++, irq_bit <<= 1) {
if (events & irq_bit/* & baboon_active*/) {
baboon_active &= ~irq_bit;
mac_do_irq_list(IRQ_BABOON_0 + i, regs);
baboon_active |= irq_bit;
baboon->mb_ifr &= ~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
}
void baboon_irq_enable(int irq) {
int irq_idx = IRQ_IDX(irq);
#ifdef DEBUG_IRQUSE
printk("baboon_irq_enable(%d)\n", irq);
#endif
baboon_active |= (1 << irq_idx);
}
void baboon_irq_disable(int irq) {
int irq_idx = IRQ_IDX(irq);
#ifdef DEBUG_IRQUSE
printk("baboon_irq_disable(%d)\n", irq);
#endif
baboon_active &= ~(1 << irq_idx);
}
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);
}
|