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/*
* linux/drivers/ide/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 <linux/init.h>
#include <asm/machw.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
/*
* Base of the IDE interface (see ATAManager ROM code)
*/
#define MAC_HD_BASE 0x50f1a000
/*
* Offsets from the above base (scaling 4)
*/
#define MAC_HD_DATA 0x00
#define MAC_HD_ERROR 0x04 /* see err-bits */
#define MAC_HD_NSECTOR 0x08 /* nr of sectors to read/write */
#define MAC_HD_SECTOR 0x0c /* starting sector */
#define MAC_HD_LCYL 0x10 /* starting cylinder */
#define MAC_HD_HCYL 0x14 /* high byte of starting cyl */
#define MAC_HD_SELECT 0x18 /* 101dhhhh , d=drive, hhhh=head */
#define MAC_HD_STATUS 0x1c /* see status-bits */
#define MAC_HD_CONTROL 0x38 /* control/altstatus */
static int __init macide_offsets[IDE_NR_PORTS] = {
MAC_HD_DATA, MAC_HD_ERROR, MAC_HD_NSECTOR, MAC_HD_SECTOR, MAC_HD_LCYL,
MAC_HD_HCYL, MAC_HD_SELECT, MAC_HD_STATUS, MAC_HD_CONTROL
};
/*
* Other registers
*/
/*
* IDE interrupt status register for both (?) hwifs on Quadra
* Initial setting: 0xc
* Guessing again:
* 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
*
* Only relevant item: bit 5, to be checked by mac_ack_intr
*/
#define MAC_HD_ISR 0x101
static int mac_ack_intr(ide_hwif_t* hwif)
{
unsigned char isr;
isr = readb(MAC_HD_BASE + MAC_HD_ISR);
if (isr & (1<<5)) {
writeb(isr & ~(1<<5), MAC_HD_BASE + MAC_HD_ISR);
return 1;
}
return 0;
}
/*
* Probe for a Macintosh IDE interface
*/
void __init macide_init(void)
{
hw_regs_t hw;
int index = -1;
if (!MACH_IS_MAC || macintosh_config->ide_type == 0)
return;
switch (macintosh_config->ide_type) {
case MAC_IDE_QUADRA:
ide_setup_ports(&hw, (ide_ioreg_t)MAC_HD_BASE, macide_offsets,
0, (ide_ioreg_t)(MAC_HD_BASE+MAC_HD_ISR),
mac_ack_intr, IRQ_NUBUS_F);
index = ide_register_hw(&hw, NULL);
break;
default:
ide_setup_ports(&hw, (ide_ioreg_t)MAC_HD_BASE, macide_offsets,
0, 0, NULL, IRQ_NUBUS_C);
index = ide_register_hw(&hw, NULL);
break;
}
if (index != -1) {
if (macintosh_config->ide_type == MAC_IDE_QUADRA)
printk("ide%d: Macintosh Quadra IDE interface\n", index);
else
printk("ide%d: Macintosh Powerbook IDE interface\n", index);
}
}
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