rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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 | int baboon_present; |
| 19 | static volatile struct baboon *baboon; |
| 20 | |
| 21 | #if 0 |
| 22 | extern int macide_ack_intr(struct ata_channel *); |
| 23 | #endif |
| 24 | |
| 25 | /* |
| 26 | * Baboon initialization. |
| 27 | */ |
| 28 | |
| 29 | void __init baboon_init(void) |
| 30 | { |
| 31 | if (macintosh_config->ident != MAC_MODEL_PB190) { |
| 32 | baboon = NULL; |
| 33 | baboon_present = 0; |
| 34 | return; |
| 35 | } |
| 36 | |
| 37 | baboon = (struct baboon *) BABOON_BASE; |
| 38 | baboon_present = 1; |
| 39 | |
| 40 | printk("Baboon detected at %p\n", baboon); |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Baboon interrupt handler. This works a lot like a VIA. |
| 45 | */ |
| 46 | |
| 47 | static void baboon_irq(struct irq_desc *desc) |
| 48 | { |
| 49 | int irq_bit, irq_num; |
| 50 | unsigned char events; |
| 51 | |
| 52 | events = baboon->mb_ifr & 0x07; |
| 53 | if (!events) |
| 54 | return; |
| 55 | |
| 56 | irq_num = IRQ_BABOON_0; |
| 57 | irq_bit = 1; |
| 58 | do { |
| 59 | if (events & irq_bit) { |
| 60 | baboon->mb_ifr &= ~irq_bit; |
| 61 | generic_handle_irq(irq_num); |
| 62 | } |
| 63 | irq_bit <<= 1; |
| 64 | irq_num++; |
| 65 | } while(events >= irq_bit); |
| 66 | #if 0 |
| 67 | if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL); |
| 68 | /* for now we need to smash all interrupts */ |
| 69 | baboon->mb_ifr &= ~events; |
| 70 | #endif |
| 71 | } |
| 72 | |
| 73 | /* |
| 74 | * Register the Baboon interrupt dispatcher on nubus slot $C. |
| 75 | */ |
| 76 | |
| 77 | void __init baboon_register_interrupts(void) |
| 78 | { |
| 79 | irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq); |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * The means for masking individual Baboon interrupts remains a mystery. |
| 84 | * However, since we only use the IDE IRQ, we can just enable/disable all |
| 85 | * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must |
| 86 | * either figure out how to mask them individually or else implement the |
| 87 | * same workaround that's used for NuBus slots (see nubus_disabled and |
| 88 | * via_nubus_irq_shutdown). |
| 89 | */ |
| 90 | |
| 91 | void baboon_irq_enable(int irq) |
| 92 | { |
| 93 | mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C)); |
| 94 | } |
| 95 | |
| 96 | void baboon_irq_disable(int irq) |
| 97 | { |
| 98 | mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C)); |
| 99 | } |