patch-1.3.63 linux/drivers/block/ht6560b.c

• Lines: 255
• Date: Mon Feb 12 07:04:02 1996
• Orig file: v1.3.62/linux/drivers/block/ht6560b.c
• Orig date: Fri Feb 9 17:53:00 1996

diff -u --recursive --new-file v1.3.62/linux/drivers/block/ht6560b.c linux/drivers/block/ht6560b.c
@@ -1,9 +1,55 @@
 /*
- *  linux/drivers/block/ht6580.c       Version 0.01  Feb 06, 1996
+ *  linux/drivers/block/ht6580.c       Version 0.03  Feb 09, 1996
  *
  *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
  */
 
+/*
+ *
+ *  Version 0.01        Initial version hacked out of ide.c
+ *
+ *  Version 0.02        Added support for PIO modes, auto-tune
+ *
+ *  Version 0.03        Some cleanups
+ *
+ * I reviewed some assembler sourcer listings of htide drivers and found
+ * out how they setup those cycle time interfacing values, as they at Holtek
+ * call them. IDESETUP.COM that is supplied with the drivers figures out
+ * optimal values and fetches those values to drivers. I found out that
+ * they use IDE_SELECT_REG to fetch timings to the ide board right after
+ * interface switching. After that it was quite easy to add code to
+ * ht6560b.c.
+ *
+ * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
+ * for hda and hdc. But hdb needed higher values to work, so I guess
+ * that sometimes it is necessary to give higher value than IDESETUP
+ * gives.   [see cmd640.c for an extreme example of this. -ml]
+ *
+ * Perhaps I should explain something about these timing values:
+ * The higher nibble of value is the Recovery Time  (rt) and the lower nibble
+ * of the value is the Active Time  (at). Minimum value 2 is the fastest and
+ * the maximum value 15 is the slowest. Default values should be 15 for both.
+ * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
+ * both values, and IDESETUP gives automatically rt=15 st=15 for cdroms or
+ * similar. If value is too small there will be all sorts of failures.
+ *
+ * Port 0x3e6 bit 0x20 sets these timings on/off. If 0x20 bit is set
+ * these timings are disabled.
+ *
+ * Mikko Ala-Fossi
+ *
+ * More notes:
+ *
+ * There's something still missing from the initialization code, though.
+ * If I have booted to dos sometime after power on, I can get smaller
+ * timing values working. Perhaps I could soft-ice the initialization.
+ *
+ * OS/2 driver seems to use some kind of DMA. But that code is really
+ * messy to me to found out how.
+ *
+ * -=- malafoss@snakemail.hut.fi -=- searching the marvels of universe -=-
+ */
+
 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
 
 #include <linux/types.h>
@@ -16,6 +62,7 @@
 #include <linux/hdreg.h>
 #include <asm/io.h>
 #include "ide.h"
+#include "ide_modes.h"
 
 /*
  * This routine handles interface switching for the peculiar hardware design
@@ -31,33 +78,80 @@
  */
 
 /*
+ * The special i/o-port that HT-6560B uses to select interfaces:
+ */
+#define HT_SELECT_PORT     0x3e6
+
+/*
  * We don't know what all of the bits are for, but we *do* know about these:
- *	bit5 (0x20): "1" selects slower speed (?)
+ *	bit5 (0x20): "1" selects slower speed by disabling use of timing values
  *	bit0 (0x01): "1" selects second interface
  */
-static byte qd6560b_selects [2][MAX_DRIVES] = {{0x3c,0x3c}, {0x3d,0x3d}};
+static byte ht6560b_selects [2][MAX_DRIVES] = {{0x3c,0x3c}, {0x3d,0x3d}};
+
+/*
+ * VLB ht6560b Timing values:
+ *
+ * Timing byte consists of
+ *      High nibble:  Recovery Time  (rt)
+ *           The valid values range from 2 to 15. The default is 15.
+ *
+ *      Low nibble:   Active Time    (at)
+ *           The valid values range from 2 to 15. The default is 15.
+ *
+ * You can obtain optimized timing values by running Holtek IDESETUP.COM
+ * for DOS. DOS drivers get their timing values from command line, where
+ * the first value is the Recovery Time and the second value is the
+ * Active Time for each drive. Smaller value gives higher speed.
+ * In case of failures you should probably fall back to a higher value.
+ *
+ * Hopefully this example will make it clearer:
+ *
+ * DOS:    DEVICE=C:\bin\HTIDE\HTIDE.SYS /D0=2,4 /D1=4,5 /D2=10,10 /D3=15,15
+ * Linux:  byte ht6560b_timings [][] = {{0x24, 0x45}, {0xaa, 0xff}};
+ *
+ * Note: There are no ioctls to change these values directly,
+ * but settings can be approximated as PIO modes, using "hdparm":
+ *
+ * rc.local:  hdparm -p3 /dev/hda -p2 /dev/hdb -p1 /dev/hdc -p0 /dev/hdd
+ */
+
+static byte ht6560b_timings [2][MAX_DRIVES] = {{0xff,0xff}, {0xff,0xff}};
 
-static void qd6560b_selectproc (ide_drive_t *drive)	/* called from ide.c */
+static byte pio_to_timings[6] = {0xff, 0xaa, 0x45, 0x24, 0x13, 0x12};
+
+/*
+ * This routine is invoked from ide.c to prepare for access to a given drive.
+ */
+static void ht6560b_selectproc (ide_drive_t *drive)
 {
+	byte t;
+	unsigned long flags;
 	static byte current_select = 0;
-	byte drive_select = qd6560b_selects[HWIF(drive)->index][drive->select.b.unit];
-
-	if (drive_select != current_select) {
-		byte t;
-		unsigned long flags;
+	static byte current_timing = 0;
+	byte select = ht6560b_selects[HWIF(drive)->index][drive->select.b.unit];
+        byte timing = ht6560b_timings[HWIF(drive)->index][drive->select.b.unit];
+
+	if (select != current_select || timing != current_timing) {
+		current_select = select;
+		current_timing = timing;
 		save_flags (flags);
 		cli();
-		current_select = drive_select;
-		(void) inb(0x3e6);
-		(void) inb(0x3e6);
-		(void) inb(0x3e6);
+		(void) inb(HT_SELECT_PORT);
+		(void) inb(HT_SELECT_PORT);
+		(void) inb(HT_SELECT_PORT);
 		/*
 		 * Note: input bits are reversed to output bits!!
 		 */
-		t = inb(0x3e6) ^ 0x3f;
+		t = inb(HT_SELECT_PORT) ^ 0x3f;
 		t &= (~0x21);
 		t |= (current_select & 0x21);
-		outb(t,0x3e6);
+		outb(t, HT_SELECT_PORT);
+                /*
+                 * Set timing for this drive:
+                 */
+                outb (timing, IDE_SELECT_REG);
+                (void) inb (IDE_STATUS_REG);
 		restore_flags (flags);
 	}
 }
@@ -71,28 +165,29 @@
 	int i;
 
 	/* Autodetect ht6560b */
-	if ((orig_value=inb(0x3e6)) == 0xff)
+	if ((orig_value=inb(HT_SELECT_PORT)) == 0xff)
 		return 0;
 
 	for (i=3;i>0;i--) {
-		outb(0x00,0x3e6);
-		if (!( (~inb(0x3e6)) & 0x3f )) {
-			  outb(orig_value,0x3e6);
+		outb(0x00, HT_SELECT_PORT);
+		if (!( (~inb(HT_SELECT_PORT)) & 0x3f )) {
+			  outb(orig_value, HT_SELECT_PORT);
 			  return 0;
 		}
 	}
-	outb(0x00,0x3e6);
-	if ((~inb(0x3e6))& 0x3f) {
-		outb(orig_value,0x3e6);
+	outb(0x00, HT_SELECT_PORT);
+	if ((~inb(HT_SELECT_PORT))& 0x3f) {
+		outb(orig_value, HT_SELECT_PORT);
 		return 0;
 	}
-	/* 
+	/*
 	 * Ht6560b autodetected:
 	 *     reverse input bits to output bits
 	 *     initialize bit1 to 0
 	 */
-	outb((orig_value ^ 0x3f) & 0xfd,0x3e6);
-	printk("ht6560b: detected and initialized\n");
+	outb((orig_value ^ 0x3f) & 0xfd, HT_SELECT_PORT);
+
+	printk("\nht6560b: detected and initialized");
 	return 1;
 }
 
@@ -101,37 +196,37 @@
 	unsigned int hwif, unit;
 
 	if (pio == 255)  {	/* auto-tune */
-		if (drive->media != ide_disk) {
-			pio = 0; /* cdroms don't like our fast mode */
-		} else {
-			struct hd_driveid *id = drive->id;
-			pio = id->tPIO;
-			if ((id->field_valid & 0x02) && (id->eide_pio_modes & 0x01))
-				pio = 3;
-		}
+		if (drive->media != ide_disk)
+			pio = 0; /* some cdroms don't like fast modes (?) */
+		else
+			pio = ide_get_best_pio_mode (drive);
 	}
-	hwif = HWIF(drive)->index;
+	if (pio > 5)
+		pio = 5;
 	unit = drive->select.b.unit;
-	if (pio < 3)
-		qd6560b_selects[hwif][unit] |= 0x20;
+	hwif = HWIF(drive)->index;
+	ht6560b_timings[hwif][unit] = pio_to_timings[pio];
+	if (pio == 0)
+		ht6560b_selects[hwif][unit] |= 0x20;
 	else
-		qd6560b_selects[hwif][unit] &= ~0x20;
+		ht6560b_selects[hwif][unit] &= ~0x20;
 }
 
 void init_ht6560b (void)
 {
-	if (check_region(0x3e6,1)) {
+	if (check_region(HT_SELECT_PORT,1)) {
 		printk("\nht6560b: PORT 0x3e6 ALREADY IN USE\n");
 	} else {
 		if (try_to_init_ht6560b()) {
-			request_region(0x3e6, 1, "ht6560b");
+			request_region(HT_SELECT_PORT, 1, ide_hwifs[0].name);
 			ide_hwifs[0].chipset = ide_ht6560b;
 			ide_hwifs[1].chipset = ide_ht6560b;
-			ide_hwifs[0].selectproc = &qd6560b_selectproc;
-			ide_hwifs[1].selectproc = &qd6560b_selectproc;
+			ide_hwifs[0].selectproc = &ht6560b_selectproc;
+			ide_hwifs[1].selectproc = &ht6560b_selectproc;
 			ide_hwifs[0].tuneproc = &tune_ht6560b;
 			ide_hwifs[1].tuneproc = &tune_ht6560b;
 			ide_hwifs[0].serialized = 1;
-		}
+		} else
+			printk("ht6560b: not found\n");
 	}
 }