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 15 #include <asm/traps.h> 16 #include <asm/bootinfo.h> 17 #include <asm/macintosh.h> 18 #include <asm/macints.h> 19 #include <asm/mac_baboon.h> 20 21 /* #define DEBUG_BABOON */ 22 /* #define DEBUG_IRQS */ 23 24 int baboon_present; 25 static volatile struct baboon *baboon; 26 27 #if 0 28 extern int macide_ack_intr(struct ata_channel *); 29 #endif 30 31 /* 32 * Baboon initialization. 33 */ 34 35 void __init baboon_init(void) 36 { 37 if (macintosh_config->ident != MAC_MODEL_PB190) { 38 baboon = NULL; 39 baboon_present = 0; 40 return; 41 } 42 43 baboon = (struct baboon *) BABOON_BASE; 44 baboon_present = 1; 45 46 printk("Baboon detected at %p\n", baboon); 47 } 48 49 /* 50 * Baboon interrupt handler. This works a lot like a VIA. 51 */ 52 53 static irqreturn_t baboon_irq(int irq, void *dev_id) 54 { 55 int irq_bit, irq_num; 56 unsigned char events; 57 58 #ifdef DEBUG_IRQS 59 printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n", 60 (uint) baboon->mb_control, (uint) baboon->mb_ifr, 61 (uint) baboon->mb_status); 62 #endif 63 64 if (!(events = baboon->mb_ifr & 0x07)) 65 return IRQ_NONE; 66 67 irq_num = IRQ_BABOON_0; 68 irq_bit = 1; 69 do { 70 if (events & irq_bit) { 71 baboon->mb_ifr &= ~irq_bit; 72 m68k_handle_int(irq_num); 73 } 74 irq_bit <<= 1; 75 irq_num++; 76 } while(events >= irq_bit); 77 #if 0 78 if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL); 79 /* for now we need to smash all interrupts */ 80 baboon->mb_ifr &= ~events; 81 #endif 82 return IRQ_HANDLED; 83 } 84 85 /* 86 * Register the Baboon interrupt dispatcher on nubus slot $C. 87 */ 88 89 void __init baboon_register_interrupts(void) 90 { 91 request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, 92 "baboon", (void *) baboon); 93 } 94 95 void baboon_irq_enable(int irq) { 96 #ifdef DEBUG_IRQUSE 97 printk("baboon_irq_enable(%d)\n", irq); 98 #endif 99 /* FIXME: figure out how to mask and unmask baboon interrupt sources */ 100 enable_irq(IRQ_NUBUS_C); 101 } 102 103 void baboon_irq_disable(int irq) { 104 #ifdef DEBUG_IRQUSE 105 printk("baboon_irq_disable(%d)\n", irq); 106 #endif 107 disable_irq(IRQ_NUBUS_C); 108 } 109 110 void baboon_irq_clear(int irq) { 111 int irq_idx = IRQ_IDX(irq); 112 113 baboon->mb_ifr &= ~(1 << irq_idx); 114 } 115 116 int baboon_irq_pending(int irq) 117 { 118 int irq_idx = IRQ_IDX(irq); 119 120 return baboon->mb_ifr & (1 << irq_idx); 121 } 122