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/irq.h> 12 13 #include <asm/macintosh.h> 14 #include <asm/macints.h> 15 #include <asm/mac_baboon.h> 16 17 int baboon_present; 18 static volatile struct baboon *baboon; 19 20 #if 0 21 extern int macide_ack_intr(struct ata_channel *); 22 #endif 23 24 /* 25 * Baboon initialization. 26 */ 27 28 void __init baboon_init(void) 29 { 30 if (macintosh_config->ident != MAC_MODEL_PB190) { 31 baboon = NULL; 32 baboon_present = 0; 33 return; 34 } 35 36 baboon = (struct baboon *) BABOON_BASE; 37 baboon_present = 1; 38 39 printk("Baboon detected at %p\n", baboon); 40 } 41 42 /* 43 * Baboon interrupt handler. This works a lot like a VIA. 44 */ 45 46 static void baboon_irq(struct irq_desc *desc) 47 { 48 int irq_bit, irq_num; 49 unsigned char events; 50 51 events = baboon->mb_ifr & 0x07; 52 if (!events) 53 return; 54 55 irq_num = IRQ_BABOON_0; 56 irq_bit = 1; 57 do { 58 if (events & irq_bit) { 59 baboon->mb_ifr &= ~irq_bit; 60 generic_handle_irq(irq_num); 61 } 62 irq_bit <<= 1; 63 irq_num++; 64 } while(events >= irq_bit); 65 #if 0 66 if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL); 67 /* for now we need to smash all interrupts */ 68 baboon->mb_ifr &= ~events; 69 #endif 70 } 71 72 /* 73 * Register the Baboon interrupt dispatcher on nubus slot $C. 74 */ 75 76 void __init baboon_register_interrupts(void) 77 { 78 irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq); 79 } 80 81 /* 82 * The means for masking individual Baboon interrupts remains a mystery. 83 * However, since we only use the IDE IRQ, we can just enable/disable all 84 * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must 85 * either figure out how to mask them individually or else implement the 86 * same workaround that's used for NuBus slots (see nubus_disabled and 87 * via_nubus_irq_shutdown). 88 */ 89 90 void baboon_irq_enable(int irq) 91 { 92 mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C)); 93 } 94 95 void baboon_irq_disable(int irq) 96 { 97 mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C)); 98 } 99