1/*
2 *  linux/drivers/ide/macide.c -- Macintosh IDE Driver
3 *
4 *     Copyright (C) 1998 by Michael Schmitz
5 *
6 *  This driver was written based on information obtained from the MacOS IDE
7 *  driver binary by Mikael Forselius
8 *
9 *  This file is subject to the terms and conditions of the GNU General Public
10 *  License.  See the file COPYING in the main directory of this archive for
11 *  more details.
12 */
13
14#include <linux/config.h>
15#include <linux/types.h>
16#include <linux/mm.h>
17#include <linux/interrupt.h>
18#include <linux/blkdev.h>
19#include <linux/hdreg.h>
20#include <linux/delay.h>
21#include <linux/ide.h>
22
23#include <asm/machw.h>
24#include <asm/macintosh.h>
25#include <asm/macints.h>
26#include <asm/mac_baboon.h>
27
28#define IDE_BASE 0x50F1A000	/* Base address of IDE controller */
29
30/*
31 * Generic IDE registers as offsets from the base
32 * These match MkLinux so they should be correct.
33 */
34
35#define IDE_DATA	0x00
36#define IDE_ERROR	0x04	/* see err-bits */
37#define IDE_NSECTOR	0x08	/* nr of sectors to read/write */
38#define IDE_SECTOR	0x0c	/* starting sector */
39#define IDE_LCYL	0x10	/* starting cylinder */
40#define IDE_HCYL	0x14	/* high byte of starting cyl */
41#define IDE_SELECT	0x18	/* 101dhhhh , d=drive, hhhh=head */
42#define IDE_STATUS	0x1c	/* see status-bits */
43#define IDE_CONTROL	0x38	/* control/altstatus */
44
45/*
46 * Mac-specific registers
47 */
48
49/*
50 * this register is odd; it doesn't seem to do much and it's
51 * not word-aligned like virtually every other hardware register
52 * on the Mac...
53 */
54
55#define IDE_IFR		0x101	/* (0x101) IDE interrupt flags on Quadra:
56				 *
57				 * Bit 0+1: some interrupt flags
58				 * Bit 2+3: some interrupt enable
59				 * Bit 4:   ??
60				 * Bit 5:   IDE interrupt flag (any hwif)
61				 * Bit 6:   maybe IDE interrupt enable (any hwif) ??
62				 * Bit 7:   Any interrupt condition
63				 */
64
65volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
66
67static int macide_offsets[IDE_NR_PORTS] = {
68    IDE_DATA, IDE_ERROR,  IDE_NSECTOR, IDE_SECTOR, IDE_LCYL,
69    IDE_HCYL, IDE_SELECT, IDE_STATUS,  IDE_CONTROL
70};
71
72int macide_ack_intr(ide_hwif_t* hwif)
73{
74	if (*ide_ifr & 0x20) {
75		*ide_ifr &= ~0x20;
76		return 1;
77	}
78	return 0;
79}
80
81#ifdef CONFIG_BLK_DEV_MAC_MEDIABAY
82static void macide_mediabay_interrupt(int irq, void *dev_id, struct pt_regs *regs)
83{
84	int state = baboon->mb_status & 0x04;
85
86	printk("macide: media bay %s detected\n", state? "removal":"insertion");
87}
88#endif
89
90/*
91 * Probe for a Macintosh IDE interface
92 */
93
94void macide_init(void)
95{
96	hw_regs_t hw;
97	int index = -1;
98
99	switch (macintosh_config->ide_type) {
100	case MAC_IDE_QUADRA:
101		ide_setup_ports(&hw, (ide_ioreg_t)IDE_BASE, macide_offsets,
102				0, 0, macide_ack_intr, IRQ_NUBUS_F);
103		index = ide_register_hw(&hw, NULL);
104		break;
105	case MAC_IDE_PB:
106		ide_setup_ports(&hw, (ide_ioreg_t)IDE_BASE, macide_offsets,
107				0, 0, macide_ack_intr, IRQ_NUBUS_C);
108		index = ide_register_hw(&hw, NULL);
109		break;
110	case MAC_IDE_BABOON:
111		ide_setup_ports(&hw, (ide_ioreg_t)BABOON_BASE, macide_offsets,
112				0, 0, NULL, IRQ_BABOON_1);
113		index = ide_register_hw(&hw, NULL);
114		if (index == -1) break;
115		if (macintosh_config->ident == MAC_MODEL_PB190) {
116
117			/* Fix breakage in ide-disk.c: drive capacity	*/
118			/* is not initialized for drives without a 	*/
119			/* hardware ID, and we cna't get that without	*/
120			/* probing the drive which freezes a 190.	*/
121
122			ide_drive_t *drive = &ide_hwifs[index].drives[0];
123        		drive->capacity = drive->cyl*drive->head*drive->sect;
124
125#ifdef CONFIG_BLK_DEV_MAC_MEDIABAY
126			request_irq(IRQ_BABOON_2, macide_mediabay_interrupt,
127					IRQ_FLG_FAST, "mediabay",
128					macide_mediabay_interrupt);
129#endif
130		}
131		break;
132
133	default:
134	    return;
135	}
136
137        if (index != -1) {
138		if (macintosh_config->ide_type == MAC_IDE_QUADRA)
139			printk("ide%d: Macintosh Quadra IDE interface\n", index);
140		else if (macintosh_config->ide_type == MAC_IDE_PB)
141			printk("ide%d: Macintosh Powerbook IDE interface\n", index);
142		else if (macintosh_config->ide_type == MAC_IDE_BABOON)
143			printk("ide%d: Macintosh Powerbook Baboon IDE interface\n", index);
144		else
145			printk("ide%d: Unknown Macintosh IDE interface\n", index);
146	}
147}
148