blob: 3fe0e43d44f630dafea61dcdaa44835e0e84bbcd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Geert Uytterhoevenddc7fd22011-07-13 21:48:30 +020011#include <linux/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <asm/macintosh.h>
14#include <asm/macints.h>
15#include <asm/mac_baboon.h>
16
Linus Torvalds1da177e2005-04-16 15:20:36 -070017/* #define DEBUG_IRQS */
18
Finn Thain217f6712007-05-01 22:32:58 +020019int baboon_present;
Adrian Bunk8dfbdf42008-07-17 21:16:25 +020020static volatile struct baboon *baboon;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#if 0
23extern int macide_ack_intr(struct ata_channel *);
24#endif
25
26/*
27 * Baboon initialization.
28 */
29
30void __init baboon_init(void)
31{
32 if (macintosh_config->ident != MAC_MODEL_PB190) {
33 baboon = NULL;
34 baboon_present = 0;
35 return;
36 }
37
38 baboon = (struct baboon *) BABOON_BASE;
39 baboon_present = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41 printk("Baboon detected at %p\n", baboon);
42}
43
44/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 * Baboon interrupt handler. This works a lot like a VIA.
46 */
47
Geert Uytterhoeven9145db52011-08-10 12:48:29 +020048static void baboon_irq(unsigned int irq, struct irq_desc *desc)
49{
50 int irq_bit, irq_num;
51 unsigned char events;
52
53#ifdef DEBUG_IRQS
54 printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
55 (uint) baboon->mb_control, (uint) baboon->mb_ifr,
56 (uint) baboon->mb_status);
57#endif
58
59 events = baboon->mb_ifr & 0x07;
60 if (!events)
61 return;
62
63 irq_num = IRQ_BABOON_0;
64 irq_bit = 1;
65 do {
66 if (events & irq_bit) {
67 baboon->mb_ifr &= ~irq_bit;
68 generic_handle_irq(irq_num);
69 }
70 irq_bit <<= 1;
71 irq_num++;
72 } while(events >= irq_bit);
73#if 0
74 if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
75 /* for now we need to smash all interrupts */
76 baboon->mb_ifr &= ~events;
77#endif
78}
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Adrian Bunk8dfbdf42008-07-17 21:16:25 +020080/*
81 * Register the Baboon interrupt dispatcher on nubus slot $C.
82 */
83
84void __init baboon_register_interrupts(void)
85{
Geert Uytterhoeven9145db52011-08-10 12:48:29 +020086 irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
Adrian Bunk8dfbdf42008-07-17 21:16:25 +020087}
88
Finn Thain746e8d32008-11-18 20:45:21 +010089/*
Finn Thainfeb11e82011-10-24 01:11:19 +110090 * The means for masking individual Baboon interrupts remains a mystery.
91 * However, since we only use the IDE IRQ, we can just enable/disable all
92 * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must
93 * either figure out how to mask them individually or else implement the
94 * same workaround that's used for NuBus slots (see nubus_disabled and
95 * via_nubus_irq_shutdown).
Finn Thain746e8d32008-11-18 20:45:21 +010096 */
97
98void baboon_irq_enable(int irq)
99{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#ifdef DEBUG_IRQUSE
101 printk("baboon_irq_enable(%d)\n", irq);
102#endif
Finn Thain746e8d32008-11-18 20:45:21 +0100103
Finn Thainfeb11e82011-10-24 01:11:19 +1100104 mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
Finn Thain746e8d32008-11-18 20:45:21 +0100107void baboon_irq_disable(int irq)
108{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#ifdef DEBUG_IRQUSE
110 printk("baboon_irq_disable(%d)\n", irq);
111#endif
Finn Thain746e8d32008-11-18 20:45:21 +0100112
Finn Thainfeb11e82011-10-24 01:11:19 +1100113 mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}