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macide.c

/*
 *  linux/drivers/ide/legacy/macide.c -- 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/hdreg.h>
#include <linux/delay.h>
#include <linux/ide.h>

#include <asm/machw.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_DATA  0x00
#define IDE_ERROR 0x04  /* see err-bits */
#define IDE_NSECTOR     0x08  /* nr of sectors to read/write */
#define IDE_SECTOR      0x0c  /* starting sector */
#define IDE_LCYL  0x10  /* starting cylinder */
#define IDE_HCYL  0x14  /* high byte of starting cyl */
#define IDE_SELECT      0x18  /* 101dhhhh , d=drive, hhhh=head */
#define IDE_STATUS      0x1c  /* see status-bits */
#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);

static int macide_offsets[IDE_NR_PORTS] = {
    IDE_DATA, IDE_ERROR,  IDE_NSECTOR, IDE_SECTOR, IDE_LCYL,
    IDE_HCYL, IDE_SELECT, IDE_STATUS,  IDE_CONTROL
};

int macide_ack_intr(ide_hwif_t* hwif)
{
      if (*ide_ifr & 0x20) {
            *ide_ifr &= ~0x20;
            return 1;
      }
      return 0;
}

/*
 * Probe for a Macintosh IDE interface
 */

void __init macide_init(void)
{
      hw_regs_t hw;
      ide_hwif_t *hwif;
      int index = -1;

      switch (macintosh_config->ide_type) {
      case MAC_IDE_QUADRA:
            ide_setup_ports(&hw, IDE_BASE, macide_offsets,
                        0, 0, macide_ack_intr,
//                      quadra_ide_iops,
                        IRQ_NUBUS_F);
            index = ide_register_hw(&hw, NULL, 1, &hwif);
            break;
      case MAC_IDE_PB:
            ide_setup_ports(&hw, IDE_BASE, macide_offsets,
                        0, 0, macide_ack_intr,
//                      macide_pb_iops,
                        IRQ_NUBUS_C);
            index = ide_register_hw(&hw, NULL, 1, &hwif);
            break;
      case MAC_IDE_BABOON:
            ide_setup_ports(&hw, BABOON_BASE, macide_offsets,
                        0, 0, NULL,
//                      macide_baboon_iops,
                        IRQ_BABOON_1);
            index = ide_register_hw(&hw, NULL, 1, &hwif);
            if (index == -1) break;
            if (macintosh_config->ident == MAC_MODEL_PB190) {

                  /* Fix breakage in ide-disk.c: drive capacity   */
                  /* is not initialized for drives without a      */
                  /* hardware ID, and we can't get that without   */
                  /* probing the drive which freezes a 190. */

                  ide_drive_t *drive = &ide_hwifs[index].drives[0];
                  drive->capacity64 = drive->cyl*drive->head*drive->sect;

            }
            break;

      default:
          return;
      }

        if (index != -1) {
            hwif->mmio = 1;
            if (macintosh_config->ide_type == MAC_IDE_QUADRA)
                  printk(KERN_INFO "ide%d: Macintosh Quadra IDE interface\n", index);
            else if (macintosh_config->ide_type == MAC_IDE_PB)
                  printk(KERN_INFO "ide%d: Macintosh Powerbook IDE interface\n", index);
            else if (macintosh_config->ide_type == MAC_IDE_BABOON)
                  printk(KERN_INFO "ide%d: Macintosh Powerbook Baboon IDE interface\n", index);
            else
                  printk(KERN_INFO "ide%d: Unknown Macintosh IDE interface\n", index);
      }
}

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