/*

   *  Macintosh IDE Driver

   *
   *     Copyright (C) 1998 by Michael Schmitz
   *
   *  This driver was written based on information obtained from the MacOS IDE
   *  driver binary by Mikael Forselius
   *
   *  This file is subject to the terms and conditions of the GNU General Public
   *  License.  See the file COPYING in the main directory of this archive for
   *  more details.
   */

  #include <linux/types.h>
  #include <linux/mm.h>
  #include <linux/interrupt.h>
  #include <linux/blkdev.h>

  #include <linux/delay.h>
  #include <linux/ide.h>

  #include <linux/module.h>

  #include <asm/macintosh.h>
  #include <asm/macints.h>
  #include <asm/mac_baboon.h>
  
  #define IDE_BASE 0x50F1A000	/* Base address of IDE controller */
  
  /*
   * Generic IDE registers as offsets from the base
   * These match MkLinux so they should be correct.
   */

  #define IDE_CONTROL	0x38	/* control/altstatus */
  
  /*
   * Mac-specific registers
   */
  
  /*
   * this register is odd; it doesn't seem to do much and it's
   * not word-aligned like virtually every other hardware register
   * on the Mac...
   */
  
  #define IDE_IFR		0x101	/* (0x101) IDE interrupt flags on Quadra:
  				 *
  				 * Bit 0+1: some interrupt flags
  				 * Bit 2+3: some interrupt enable
  				 * Bit 4:   ??
  				 * Bit 5:   IDE interrupt flag (any hwif)
  				 * Bit 6:   maybe IDE interrupt enable (any hwif) ??
  				 * Bit 7:   Any interrupt condition
  				 */
  
  volatile unsigned char *ide_ifr = (unsigned char *) (IDE_BASE + IDE_IFR);

  int macide_test_irq(ide_hwif_t *hwif)

  {

  	if (*ide_ifr & 0x20)

  		return 1;

  	return 0;
  }

  static void macide_clear_irq(ide_drive_t *drive)
  {
  	*ide_ifr &= ~0x20;
  }

  static void __init macide_setup_ports(struct ide_hw *hw, unsigned long base,

  				      int irq)

  {
  	int i;
  
  	memset(hw, 0, sizeof(*hw));
  
  	for (i = 0; i < 8; i++)

  		hw->io_ports_array[i] = base + i * 4;

  	hw->io_ports.ctl_addr = base + IDE_CONTROL;

  
  	hw->irq = irq;

  }

  static const struct ide_port_ops macide_port_ops = {
  	.clear_irq		= macide_clear_irq,

  	.test_irq		= macide_test_irq,

  };

  static const struct ide_port_info macide_port_info = {

  	.port_ops		= &macide_port_ops,

  	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,

  	.irq_flags		= IRQF_SHARED,

  	.chipset		= ide_generic,

  };

  static const char *mac_ide_name[] =
  	{ "Quadra", "Powerbook", "Powerbook Baboon" };

  /*
   * Probe for a Macintosh IDE interface
   */

  static int __init macide_init(void)

  {

  	unsigned long base;
  	int irq;

  	struct ide_hw hw, *hws[] = { &hw };

  	struct ide_port_info d = macide_port_info;

  	if (!MACH_IS_MAC)
  		return -ENODEV;

  	switch (macintosh_config->ide_type) {
  	case MAC_IDE_QUADRA:

  		base = IDE_BASE;

  		irq = IRQ_NUBUS_F;

  		break;
  	case MAC_IDE_PB:

  		base = IDE_BASE;

  		irq = IRQ_NUBUS_C;

  		break;
  	case MAC_IDE_BABOON:

  		base = BABOON_BASE;

  		d.port_ops = NULL;

  		irq = IRQ_BABOON_1;

  		break;
  	default:

  		return -ENODEV;

  	}

  	printk(KERN_INFO "ide: Macintosh %s IDE controller
  ",
  			 mac_ide_name[macintosh_config->ide_type - 1]);

  	macide_setup_ports(&hw, base, irq);

  	return ide_host_add(&d, hws, 1, NULL);

  }

  
  module_init(macide_init);

  
  MODULE_LICENSE("GPL");