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/irq.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_IRQS */
  23
  24 int baboon_present;
  25 static volatile struct baboon *baboon;
  26 static unsigned char baboon_disabled;
  27
  28 #if 0
  29 extern int macide_ack_intr(struct ata_channel *);
  30 #endif
  31
  32 /*
  33  * Baboon initialization.
  34  */
  35
  36 void __init baboon_init(void)
  37 {
  38         if (macintosh_config->ident != MAC_MODEL_PB190) {
  39                 baboon = NULL;
  40                 baboon_present = 0;
  41                 return;
  42         }
  43
  44         baboon = (struct baboon *) BABOON_BASE;
  45         baboon_present = 1;
  46
  47         printk("Baboon detected at %p\n", baboon);
  48 }
  49
  50 /*
  51  * Baboon interrupt handler. This works a lot like a VIA.
  52  */
  53
  54 static void baboon_irq(unsigned int irq, struct irq_desc *desc)
  55 {
  56         int irq_bit, irq_num;
  57         unsigned char events;
  58
  59 #ifdef DEBUG_IRQS
  60         printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
  61                 (uint) baboon->mb_control, (uint) baboon->mb_ifr,
  62                 (uint) baboon->mb_status);
  63 #endif
  64
  65         events = baboon->mb_ifr & 0x07;
  66         if (!events)
  67                 return;
  68
  69         irq_num = IRQ_BABOON_0;
  70         irq_bit = 1;
  71         do {
  72                 if (events & irq_bit) {
  73                         baboon->mb_ifr &= ~irq_bit;
  74                         generic_handle_irq(irq_num);
  75                 }
  76                 irq_bit <<= 1;
  77                 irq_num++;
  78         } while(events >= irq_bit);
  79 #if 0
  80         if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
  81         /* for now we need to smash all interrupts */
  82         baboon->mb_ifr &= ~events;
  83 #endif
  84 }
  85
  86 /*
  87  * Register the Baboon interrupt dispatcher on nubus slot $C.
  88  */
  89
  90 void __init baboon_register_interrupts(void)
  91 {
  92         baboon_disabled = 0;
  93         irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
  94 }
  95
  96 /*
  97  * The means for masking individual baboon interrupts remains a mystery, so
  98  * enable the umbrella interrupt only when no baboon interrupt is disabled.
  99  */
 100
 101 void baboon_irq_enable(int irq)
 102 {
 103         int irq_idx = IRQ_IDX(irq);
 104
 105 #ifdef DEBUG_IRQUSE
 106         printk("baboon_irq_enable(%d)\n", irq);
 107 #endif
 108
 109         baboon_disabled &= ~(1 << irq_idx);
 110         if (!baboon_disabled)
 111                 mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
 112 }
 113
 114 void baboon_irq_disable(int irq)
 115 {
 116         int irq_idx = IRQ_IDX(irq);
 117
 118 #ifdef DEBUG_IRQUSE
 119         printk("baboon_irq_disable(%d)\n", irq);
 120 #endif
 121
 122         baboon_disabled |= 1 << irq_idx;
 123         if (baboon_disabled)
 124                 mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
 125 }
 126
 127 void baboon_irq_clear(int irq)
 128 {
 129         int irq_idx = IRQ_IDX(irq);
 130
 131         baboon->mb_ifr &= ~(1 << irq_idx);
 132 }
 133
 134 int baboon_irq_pending(int irq)
 135 {
 136         int irq_idx = IRQ_IDX(irq);
 137
 138         return baboon->mb_ifr & (1 << irq_idx);
 139 }