patch-2.3.99-pre1 linux/drivers/ide/macide.c

• Lines: 117
• Date: Sat Feb 26 20:32:14 2000
• Orig file: v2.3.51/linux/drivers/ide/macide.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.51/linux/drivers/ide/macide.c linux/drivers/ide/macide.c
@@ -0,0 +1,116 @@
+/*
+ *  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 <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);
+	}
+}