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#include <linux/module.h>
 21
 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_test_irq(ide_hwif_t *hwif)
 58{
 59	if (*ide_ifr & 0x20)
 60		return 1;
 61	return 0;
 62}
 63
 64static void macide_clear_irq(ide_drive_t *drive)
 65{
 66	*ide_ifr &= ~0x20;
 67}
 68
 69static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,
 70				      int irq)
 71{
 72	int i;
 73
 74	memset(hw, 0, sizeof(*hw));
 75
 76	for (i = 0; i < 8; i++)
 77		hw->io_ports_array[i] = base + i * 4;
 78
 79	hw->io_ports.ctl_addr = base + IDE_CONTROL;
 80
 81	hw->irq = irq;
 82}
 83
 84static const struct ide_port_ops macide_port_ops = {
 85	.clear_irq		= macide_clear_irq,
 86	.test_irq		= macide_test_irq,
 87};
 88
 89static const struct ide_port_info macide_port_info = {
 90	.port_ops		= &macide_port_ops,
 91	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 92	.irq_flags		= IRQF_SHARED,
 93	.chipset		= ide_generic,
 94};
 95
 96static const char *mac_ide_name[] =
 97	{ "Quadra", "Powerbook", "Powerbook Baboon" };
 98
 99/*
100 * Probe for a Macintosh IDE interface
101 */
102
103static int __init macide_init(void)
104{
105	unsigned long base;
106	int irq;
107	struct ide_hw hw, *hws[] = { &hw };
108	struct ide_port_info d = macide_port_info;
109
110	if (!MACH_IS_MAC)
111		return -ENODEV;
112
113	switch (macintosh_config->ide_type) {
114	case MAC_IDE_QUADRA:
115		base = IDE_BASE;
116		irq = IRQ_NUBUS_F;
117		break;
118	case MAC_IDE_PB:
119		base = IDE_BASE;
120		irq = IRQ_NUBUS_C;
121		break;
122	case MAC_IDE_BABOON:
123		base = BABOON_BASE;
124		d.port_ops = NULL;
125		irq = IRQ_BABOON_1;
126		break;
127	default:
128		return -ENODEV;
129	}
130
131	printk(KERN_INFO "ide: Macintosh %s IDE controller\n",
132			 mac_ide_name[macintosh_config->ide_type - 1]);
133
134	macide_setup_ports(&hw, base, irq);
135
136	return ide_host_add(&d, hws, 1, NULL);
137}
138
139module_init(macide_init);
140
141MODULE_LICENSE("GPL");