1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Baboon Custom IC Management 4 * 5 * The Baboon custom IC controls the IDE, PCMCIA and media bay on the 6 * PowerBook 190. It multiplexes multiple interrupt sources onto the 7 * Nubus slot $C interrupt. 8 */ 9 10 #include <linux/types.h> 11 #include <linux/kernel.h> 12 #include <linux/irq.h> 13 14 #include <asm/macintosh.h> 15 #include <asm/macints.h> 16 #include <asm/mac_baboon.h> 17 18 #include "mac.h" 19 20 int baboon_present; 21 static volatile struct baboon *baboon; 22 23 /* 24 * Baboon initialization. 25 */ 26 baboon_init(void)27void __init baboon_init(void) 28 { 29 if (macintosh_config->ident != MAC_MODEL_PB190) { 30 baboon = NULL; 31 baboon_present = 0; 32 return; 33 } 34 35 baboon = (struct baboon *) BABOON_BASE; 36 baboon_present = 1; 37 38 pr_debug("Baboon detected at %p\n", baboon); 39 } 40 41 /* 42 * Baboon interrupt handler. 43 * XXX how do you clear a pending IRQ? is it even necessary? 44 */ 45 baboon_irq(struct irq_desc * desc)46static void baboon_irq(struct irq_desc *desc) 47 { 48 short events, irq_bit; 49 int irq_num; 50 51 events = baboon->mb_ifr & 0x07; 52 irq_num = IRQ_BABOON_0; 53 irq_bit = 1; 54 do { 55 if (events & irq_bit) { 56 events &= ~irq_bit; 57 generic_handle_irq(irq_num); 58 } 59 ++irq_num; 60 irq_bit <<= 1; 61 } while (events); 62 } 63 64 /* 65 * Register the Baboon interrupt dispatcher on nubus slot $C. 66 */ 67 baboon_register_interrupts(void)68void __init baboon_register_interrupts(void) 69 { 70 irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq); 71 } 72 73 /* 74 * The means for masking individual Baboon interrupts remains a mystery. 75 * However, since we only use the IDE IRQ, we can just enable/disable all 76 * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must 77 * either figure out how to mask them individually or else implement the 78 * same workaround that's used for NuBus slots (see nubus_disabled and 79 * via_nubus_irq_shutdown). 80 */ 81 baboon_irq_enable(int irq)82void baboon_irq_enable(int irq) 83 { 84 mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C)); 85 } 86 baboon_irq_disable(int irq)87void baboon_irq_disable(int irq) 88 { 89 mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C)); 90 } 91