patch-2.2.18 linux/drivers/block/macide.c

• Lines: 123
• Date: Fri Oct 13 23:40:43 2000
• Orig file: v2.2.17/drivers/block/macide.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/block/macide.c linux/drivers/block/macide.c
@@ -0,0 +1,122 @@
+/*
+ *  linux/drivers/block/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 "ide.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 const int 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
+     */
+
+__initfunc(int macide_probe_hwif(int index, ide_hwif_t *hwif))
+{
+	static int mac_index = 0;
+
+	if (!MACH_IS_MAC || macintosh_config->ide_type == 0)
+		return 0;
+
+	if (!mac_index) {
+		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);
+		mac_index = index+1;
+	}
+	if (mac_index == index+1) {
+		ide_setup_ports(hwif,
+				(ide_ioreg_t)MAC_HD_BASE,
+				macide_offsets, 
+				0, NULL);
+
+		if (macintosh_config->ide_type == MAC_IDE_QUADRA) {
+			hwif->irq = IRQ_NUBUS_F;
+		} else {
+			/* PowerBooks - Slot C is the Comm Slot on the
+			   Q630 */
+			hwif->irq = IRQ_NUBUS_C;
+		}
+		hwif->ack_intr = mac_ack_intr;
+
+		return 1;
+	}
+	return 0;
+}