baboon.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * 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 %pn", 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 %02Xn",
- (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);
- }