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;
  26 volatile struct baboon *baboon;
  27
  28 irqreturn_t baboon_irq(int, void *);
  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
  49         printk("Baboon detected at %p\n", baboon);
  50 }
  51
  52 /*
  53  * Register the Baboon interrupt dispatcher on nubus slot $C.
  54  */
  55
  56 void __init baboon_register_interrupts(void)
  57 {
  58         request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
  59                     "baboon", (void *) baboon);
  60 }
  61
  62 /*
  63  * Baboon interrupt handler. This works a lot like a VIA.
  64  */
  65
  66 irqreturn_t baboon_irq(int irq, void *dev_id)
  67 {
  68         int irq_bit, irq_num;
  69         unsigned char events;
  70
  71 #ifdef DEBUG_IRQS
  72         printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
  73                 (uint) baboon->mb_control, (uint) baboon->mb_ifr,
  74                 (uint) baboon->mb_status);
  75 #endif
  76
  77         if (!(events = baboon->mb_ifr & 0x07))
  78                 return IRQ_NONE;
  79
  80         irq_num = IRQ_BABOON_0;
  81         irq_bit = 1;
  82         do {
  83                 if (events & irq_bit) {
  84                         baboon->mb_ifr &= ~irq_bit;
  85                         m68k_handle_int(irq_num);
  86                 }
  87                 irq_bit <<= 1;
  88                 irq_num++;
  89         } while(events >= irq_bit);
  90 #if 0
  91         if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
  92         /* for now we need to smash all interrupts */
  93         baboon->mb_ifr &= ~events;
  94 #endif
  95         return IRQ_HANDLED;
  96 }
  97
  98 void baboon_irq_enable(int irq) {
  99 #ifdef DEBUG_IRQUSE
 100         printk("baboon_irq_enable(%d)\n", irq);
 101 #endif
 102         /* FIXME: figure out how to mask and unmask baboon interrupt sources */
 103         enable_irq(IRQ_NUBUS_C);
 104 }
 105
 106 void baboon_irq_disable(int irq) {
 107 #ifdef DEBUG_IRQUSE
 108         printk("baboon_irq_disable(%d)\n", irq);
 109 #endif
 110         disable_irq(IRQ_NUBUS_C);
 111 }
 112
 113 void baboon_irq_clear(int irq) {
 114         int irq_idx     = IRQ_IDX(irq);
 115
 116         baboon->mb_ifr &= ~(1 << irq_idx);
 117 }
 118
 119 int baboon_irq_pending(int irq)
 120 {
 121         int irq_idx     = IRQ_IDX(irq);
 122
 123         return baboon->mb_ifr & (1 << irq_idx);
 124 }