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 static volatile struct baboon *baboon; 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 irqreturn_t baboon_irq(int irq, void *dev_id) 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 if (!(events = baboon->mb_ifr & 0x07)) 66 return IRQ_NONE; 67 68 irq_num = IRQ_BABOON_0; 69 irq_bit = 1; 70 do { 71 if (events & irq_bit) { 72 baboon->mb_ifr &= ~irq_bit; 73 m68k_handle_int(irq_num); 74 } 75 irq_bit <<= 1; 76 irq_num++; 77 } while(events >= irq_bit); 78 #if 0 79 if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL); 80 /* for now we need to smash all interrupts */ 81 baboon->mb_ifr &= ~events; 82 #endif 83 return IRQ_HANDLED; 84 } 85 86 /* 87 * Register the Baboon interrupt dispatcher on nubus slot $C. 88 */ 89 90 void __init baboon_register_interrupts(void) 91 { 92 request_irq(IRQ_NUBUS_C, baboon_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, 93 "baboon", (void *) baboon); 94 } 95 96 void baboon_irq_enable(int irq) { 97 #ifdef DEBUG_IRQUSE 98 printk("baboon_irq_enable(%d)\n", irq); 99 #endif 100 /* FIXME: figure out how to mask and unmask baboon interrupt sources */ 101 enable_irq(IRQ_NUBUS_C); 102 } 103 104 void baboon_irq_disable(int irq) { 105 #ifdef DEBUG_IRQUSE 106 printk("baboon_irq_disable(%d)\n", irq); 107 #endif 108 disable_irq(IRQ_NUBUS_C); 109 } 110 111 void baboon_irq_clear(int irq) { 112 int irq_idx = IRQ_IDX(irq); 113 114 baboon->mb_ifr &= ~(1 << irq_idx); 115 } 116 117 int baboon_irq_pending(int irq) 118 { 119 int irq_idx = IRQ_IDX(irq); 120 121 return baboon->mb_ifr & (1 << irq_idx); 122 } 123