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

• Lines: 170
• Date: Fri Oct 13 23:57:54 2000
• Orig file: v2.2.17/drivers/block/gayle.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/gayle.c linux/drivers/block/gayle.c
@@ -0,0 +1,169 @@
+/*
+ *  linux/drivers/block/gayle.c -- Amiga Gayle IDE Driver
+ *
+ *     Created 9 Jul 1997 by Geert Uytterhoeven
+ *
+ *  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/config.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+
+#include "ide.h"
+
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+#include <asm/setup.h>
+
+
+    /*
+     *  Bases of the IDE interfaces
+     */
+
+#define GAYLE_BASE_4000	0xdd2020	/* A4000/A4000T */
+#define GAYLE_BASE_1200	0xda0000	/* A1200/A600 */
+
+    /*
+     *  Offsets from one of the above bases
+     */
+
+#define GAYLE_DATA	0x00
+#define GAYLE_ERROR	0x06		/* see err-bits */
+#define GAYLE_NSECTOR	0x0a		/* nr of sectors to read/write */
+#define GAYLE_SECTOR	0x0e		/* starting sector */
+#define GAYLE_LCYL	0x12		/* starting cylinder */
+#define GAYLE_HCYL	0x16		/* high byte of starting cyl */
+#define GAYLE_SELECT	0x1a		/* 101dhhhh , d=drive, hhhh=head */
+#define GAYLE_STATUS	0x1e		/* see status-bits */
+#define GAYLE_CONTROL	0x101a
+
+static u_int gayle_offsets[IDE_NR_PORTS] = {
+    GAYLE_DATA, GAYLE_ERROR, GAYLE_NSECTOR, GAYLE_SECTOR, GAYLE_LCYL,
+    GAYLE_HCYL, GAYLE_SELECT, GAYLE_STATUS, GAYLE_CONTROL
+};
+
+
+    /*
+     *  These are at different offsets from the base
+     */
+
+#define GAYLE_IRQ_4000	0xdd3020	/* MSB = 1, Harddisk is source of */
+#define GAYLE_IRQ_1200	0xda9000	/* interrupt */
+
+
+    /*
+     *  Offset of the secondary port for IDE doublers
+     *  Note that GAYLE_CONTROL is NOT available then!
+     */
+
+#define GAYLE_NEXT_PORT	0x1000
+
+#ifndef CONFIG_BLK_DEV_IDEDOUBLER
+#define GAYLE_NUM_HWIFS		1
+#define GAYLE_NUM_PROBE_HWIFS	GAYLE_NUM_HWIFS
+#define GAYLE_HAS_CONTROL_REG	1
+#else /* CONFIG_BLK_DEV_IDEDOUBLER */
+#define GAYLE_NUM_HWIFS		2
+#define GAYLE_NUM_PROBE_HWIFS	(ide_doubler ? GAYLE_NUM_HWIFS : \
+					       GAYLE_NUM_HWIFS-1)
+#define GAYLE_HAS_CONTROL_REG	(!ide_doubler)
+int ide_doubler = 0;	/* support IDE doublers? */
+#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
+
+
+    /*
+     *  Check and acknowledge the interrupt status
+     */
+
+static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
+{
+    unsigned char ch;
+
+    ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
+    if (!(ch & 0x80))
+	return 0;
+    return 1;
+}
+
+static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
+{
+    unsigned char ch;
+
+    ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
+    if (!(ch & 0x80))
+	return 0;
+    (void)inb(hwif->io_ports[IDE_STATUS_OFFSET]);
+    outb(0x7c | (ch & 0x03), hwif->io_ports[IDE_IRQ_OFFSET]);
+    return 1;
+}
+
+
+    /*
+     *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
+     */
+
+int gayle_probe_hwif(int index, ide_hwif_t *hwif)
+{
+    static int gayle_index[GAYLE_NUM_HWIFS] = { 0, };
+    int a4000, i;
+
+    if (!MACH_IS_AMIGA)
+	return 0;
+
+    if (!(a4000 = AMIGAHW_PRESENT(A4000_IDE)) && !AMIGAHW_PRESENT(A1200_IDE))
+	return 0;
+
+    if (!GAYLE_HAS_CONTROL_REG)
+	gayle_offsets[IDE_CONTROL_OFFSET] = -1;
+
+    for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
+	if (!gayle_index[i]) {
+	    switch (i) {
+		case 0:
+		    printk("ide%d: Gayle IDE interface (A%d style)\n", index,
+			   a4000 ? 4000 : 1200);
+		    break;
+#ifdef CONFIG_BLK_DEV_IDEDOUBLER
+		case 1:
+		    printk("ide%d: IDE doubler\n", index);
+		    break;
+#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
+	    }
+	    gayle_index[i] = index+1;
+	}
+	if (gayle_index[i] == index+1) {
+	    ide_ioreg_t base, irqport;
+	    ide_ack_intr_t *ack_intr;
+	    if (a4000) {
+		base = (ide_ioreg_t)ZTWO_VADDR(GAYLE_BASE_4000);
+		irqport = (ide_ioreg_t)ZTWO_VADDR(GAYLE_IRQ_4000);
+		ack_intr = gayle_ack_intr_a4000;
+	    } else {
+		base = (ide_ioreg_t)ZTWO_VADDR(GAYLE_BASE_1200);
+		irqport = (ide_ioreg_t)ZTWO_VADDR(GAYLE_IRQ_1200);
+		ack_intr = gayle_ack_intr_a1200;
+	    }
+	    base += i*GAYLE_NEXT_PORT;
+	    ide_setup_ports(hwif, base, gayle_offsets, irqport, ack_intr);
+#if 1 /* TESTING */
+	    if (i == 1) {
+		volatile u_short *addr = (u_short *)base;
+		u_short data;
+		printk("+++ Probing for IDE doubler... ");
+		*addr = 0xffff;
+		data = *addr;
+		printk("probe returned 0x%02x (PLEASE REPORT THIS!!)\n", data);
+	    }
+#endif /* TESTING */
+	    hwif->irq = IRQ_AMIGA_PORTS;
+	    return 1;
+	}
+    }
+    return 0;
+}