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/macintosh.h>
 22#include <asm/macints.h>
 23#include <asm/mac_baboon.h>
 24
 25#define IDE_BASE 0x50F1A000	/* Base address of IDE controller */
 26
 27/*
 28 * Generic IDE registers as offsets from the base
 29 * These match MkLinux so they should be correct.
 30 */
 31
 32#define IDE_CONTROL	0x38	/* control/altstatus */
 33
 34/*
 35 * Mac-specific registers
 36 */
 37
 38/*
 39 * this register is odd; it doesn't seem to do much and it's
 40 * not word-aligned like virtually every other hardware register
 41 * on the Mac...
 42 */
 43
 44#define IDE_IFR		0x101	/* (0x101) IDE interrupt flags on Quadra:
 45				 *
 46				 * Bit 0+1: some interrupt flags
 47				 * Bit 2+3: some interrupt enable
 48				 * Bit 4:   ??
 49				 * Bit 5:   IDE interrupt flag (any hwif)
 50				 * Bit 6:   maybe IDE interrupt enable (any hwif) ??
 51				 * Bit 7:   Any interrupt condition
 52				 */
 53
 54volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);
 55
 56int macide_test_irq(ide_hwif_t *hwif)
 57{
 58	if (*ide_ifr & 0x20)
 59		return 1;
 60	return 0;
 61}
 62
 63static void macide_clear_irq(ide_drive_t *drive)
 64{
 65	*ide_ifr &= ~0x20;
 66}
 67
 68static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
 69				      int irq)
 70{
 71	int i;
 72
 73	memset(hw, 0, sizeof(*hw));
 74
 75	for (i = 0; i < 8; i++)
 76		hw->io_ports_array[i] = base + i * 4;
 77
 78	hw->io_ports.ctl_addr = base + IDE_CONTROL;
 79
 80	hw->irq = irq;
 81}
 82
 83static const struct ide_port_ops macide_port_ops = {
 84	.clear_irq		= macide_clear_irq,
 85	.test_irq		= macide_test_irq,
 86};
 87
 88static const struct ide_port_info macide_port_info = {
 89	.port_ops		= &macide_port_ops,
 90	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 91	.irq_flags		= IRQF_SHARED,
 92	.chipset		= ide_generic,
 93};
 94
 95static const char *mac_ide_name[] =
 96	{ "Quadra", "Powerbook", "Powerbook Baboon" };
 97
 98/*
 99 * Probe for a Macintosh IDE interface
100 */
101
102static int __init macide_init(void)
103{
104	unsigned long base;
105	int irq;
106	struct ide_hw hw, *hws[] = { &hw };
107	struct ide_port_info d = macide_port_info;
108
109	if (!MACH_IS_MAC)
110		return -ENODEV;
111
112	switch (macintosh_config->ide_type) {
113	case MAC_IDE_QUADRA:
114		base = IDE_BASE;
115		irq = IRQ_NUBUS_F;
116		break;
117	case MAC_IDE_PB:
118		base = IDE_BASE;
119		irq = IRQ_NUBUS_C;
120		break;
121	case MAC_IDE_BABOON:
122		base = BABOON_BASE;
123		d.port_ops = NULL;
124		irq = IRQ_BABOON_1;
125		break;
126	default:
127		return -ENODEV;
128	}
129
130	printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
131			 mac_ide_name[macintosh_config->ide_type - 1]);
132
133	macide_setup_ports(&hw, base, irq);
134
135	return ide_host_add(&d, hws, 1, NULL);
136}
137
138module_init(macide_init);
139
140MODULE_LICENSE("GPL");