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/mm.h>
  12 #include <linux/delay.h>
  13 #include <linux/init.h>
  14 #include <linux/ide.h>
  15
  16 #include <asm/traps.h>
  17 #include <asm/bootinfo.h>
  18 #include <asm/macintosh.h>
  19 #include <asm/macints.h>
  20 #include <asm/mac_baboon.h>
  21
  22 /* #define DEBUG_BABOON */
  23 /* #define DEBUG_IRQS */
  24
  25 int baboon_present,baboon_active;
  26 volatile struct baboon *baboon;
  27
  28 irqreturn_t baboon_irq(int, void *, struct pt_regs *);
  29
  30 #if 0
  31 extern int macide_ack_intr(struct ata_channel *);
  32 #endif
  33
  34 /*
  35  * Baboon initialization.
  36  */
  37
  38 void __init baboon_init(void)
  39 {
  40         if (macintosh_config->ident != MAC_MODEL_PB190) {
  41                 baboon = NULL;
  42                 baboon_present = 0;
  43                 return;
  44         }
  45
  46         baboon = (struct baboon *) BABOON_BASE;
  47         baboon_present = 1;
  48         baboon_active = 0;
  49
  50         printk("Baboon detected at %p\n", baboon);
  51 }
  52
  53 /*
  54  * Register the Baboon interrupt dispatcher on nubus slot $C.
  55  */
  56
  57 void __init baboon_register_interrupts(void)
  58 {
  59         request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
  60                     "baboon", (void *) baboon);
  61 }
  62
  63 /*
  64  * Baboon interrupt handler. This works a lot like a VIA.
  65  */
  66
  67 irqreturn_t baboon_irq(int irq, void *dev_id, struct pt_regs *regs)
  68 {
  69         int irq_bit,i;
  70         unsigned char events;
  71
  72 #ifdef DEBUG_IRQS
  73         printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X active %02X\n",
  74                 (uint) baboon->mb_control, (uint) baboon->mb_ifr,
  75                 (uint) baboon->mb_status,  baboon_active);
  76 #endif
  77
  78         if (!(events = baboon->mb_ifr & 0x07))
  79                 return IRQ_NONE;
  80
  81         for (i = 0, irq_bit = 1 ; i < 3 ; i++, irq_bit <<= 1) {
  82                 if (events & irq_bit/* & baboon_active*/) {
  83                         baboon_active &= ~irq_bit;
  84                         mac_do_irq_list(IRQ_BABOON_0 + i, regs);
  85                         baboon_active |= irq_bit;
  86                         baboon->mb_ifr &= ~irq_bit;
  87                 }
  88         }
  89 #if 0
  90         if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
  91         /* for now we need to smash all interrupts */
  92         baboon->mb_ifr &= ~events;
  93 #endif
  94         return IRQ_HANDLED;
  95 }
  96
  97 void baboon_irq_enable(int irq) {
  98         int irq_idx     = IRQ_IDX(irq);
  99
 100 #ifdef DEBUG_IRQUSE
 101         printk("baboon_irq_enable(%d)\n", irq);
 102 #endif
 103         baboon_active |= (1 << irq_idx);
 104 }
 105
 106 void baboon_irq_disable(int irq) {
 107         int irq_idx     = IRQ_IDX(irq);
 108
 109 #ifdef DEBUG_IRQUSE
 110         printk("baboon_irq_disable(%d)\n", irq);
 111 #endif
 112         baboon_active &= ~(1 << irq_idx);
 113 }
 114
 115 void baboon_irq_clear(int irq) {
 116         int irq_idx     = IRQ_IDX(irq);
 117
 118         baboon->mb_ifr &= ~(1 << irq_idx);
 119 }
 120
 121 int baboon_irq_pending(int irq)
 122 {
 123         int irq_idx     = IRQ_IDX(irq);
 124
 125         return baboon->mb_ifr & (1 << irq_idx);
 126 }