macide.c revision 2bfba3c444fe8b2ab1c38112a89d8f03b61136ca 
1/*
2 *  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/types.h>
15#include <linux/mm.h>
16#include <linux/interrupt.h>
17#include <linux/blkdev.h>
18#include <linux/delay.h>
19#include <linux/ide.h>
20
21#include <asm/machw.h>
22#include <asm/macintosh.h>
23#include <asm/macints.h>
24#include <asm/mac_baboon.h>
25
26#define IDE_BASE 0x50F1A000	/* Base address of IDE controller */
27
28/*
29 * Generic IDE registers as offsets from the base
30 * These match MkLinux so they should be correct.
31 */
32
33#define IDE_CONTROL	0x38	/* control/altstatus */
34
35/*
36 * Mac-specific registers
37 */
38
39/*
40 * this register is odd; it doesn't seem to do much and it's
41 * not word-aligned like virtually every other hardware register
42 * on the Mac...
43 */
44
45#define IDE_IFR		0x101	/* (0x101) IDE interrupt flags on Quadra:
46				 *
47				 * Bit 0+1: some interrupt flags
48				 * Bit 2+3: some interrupt enable
49				 * Bit 4:   ??
50				 * Bit 5:   IDE interrupt flag (any hwif)
51				 * Bit 6:   maybe IDE interrupt enable (any hwif) ??
52				 * Bit 7:   Any interrupt condition
53				 */
54
55volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
56
57int macide_ack_intr(ide_hwif_t* hwif)
58{
59	if (*ide_ifr & 0x20) {
60		*ide_ifr &= ~0x20;
61		return 1;
62	}
63	return 0;
64}
65
66static void __init macide_setup_ports(hw_regs_t *hw, unsigned long base,
67				      int irq, ide_ack_intr_t *ack_intr)
68{
69	int i;
70
71	memset(hw, 0, sizeof(*hw));
72
73	for (i = 0; i < 8; i++)
74		hw->io_ports_array[i] = base + i * 4;
75
76	hw->io_ports.ctl_addr = base + IDE_CONTROL;
77
78	hw->irq = irq;
79	hw->ack_intr = ack_intr;
80
81	hw->chipset = ide_generic;
82}
83
84static const char *mac_ide_name[] =
85	{ "Quadra", "Powerbook", "Powerbook Baboon" };
86
87/*
88 * Probe for a Macintosh IDE interface
89 */
90
91static int __init macide_init(void)
92{
93	ide_ack_intr_t *ack_intr;
94	unsigned long base;
95	int irq;
96	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
97
98	if (!MACH_IS_MAC)
99		return -ENODEV;
100
101	switch (macintosh_config->ide_type) {
102	case MAC_IDE_QUADRA:
103		base = IDE_BASE;
104		ack_intr = macide_ack_intr;
105		irq = IRQ_NUBUS_F;
106		break;
107	case MAC_IDE_PB:
108		base = IDE_BASE;
109		ack_intr = macide_ack_intr;
110		irq = IRQ_NUBUS_C;
111		break;
112	case MAC_IDE_BABOON:
113		base = BABOON_BASE;
114		ack_intr = NULL;
115		irq = IRQ_BABOON_1;
116		break;
117	default:
118		return -ENODEV;
119	}
120
121	printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
122			 mac_ide_name[macintosh_config->ide_type - 1]);
123
124	macide_setup_ports(&hw, base, irq, ack_intr);
125
126	return ide_host_add(NULL, hws, NULL);
127}
128
129module_init(macide_init);
130
131MODULE_LICENSE("GPL");
132