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 } 125