patch-2.3.48 linux/drivers/block/ht6560b.c

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diff -u --recursive --new-file v2.3.47/linux/drivers/block/ht6560b.c linux/drivers/block/ht6560b.c
@@ -1,7 +1,7 @@
 /*
- *  linux/drivers/block/ht6580.c       Version 0.04  Mar 19, 1996
+ *  linux/drivers/block/ht6560b.c		Version 0.07	Feb  1, 2000
  *
- *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
+ *  Copyright (C) 1995-2000  Linus Torvalds & author (see below)
  */
 
 /*
@@ -12,42 +12,31 @@
  *
  *  Version 0.03        Some cleanups
  *
- * I reviewed some assembler source 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.
+ *  Version 0.05        PIO mode cycle timings auto-tune using bus-speed
  *
- * 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]
+ *  Version 0.06        Prefetch mode now defaults no OFF. To set
+ *                      prefetch mode OFF/ON use "hdparm -p8/-p9".
+ *                      Unmask irq is disabled when prefetch mode
+ *                      is enabled.
  *
- * 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.
+ *  Version 0.07        Trying to fix CD-ROM detection problem.
+ *                      "Prefetch" mode bit OFF for ide disks and
+ *                      ON for anything else.
  *
- * Mikko Ala-Fossi
  *
- * More notes:
+ *  HT-6560B EIDE-controller support
+ *  To activate controller support use kernel parameter "ide0=ht6560b".
+ *  Use hdparm utility to enable PIO mode support.
  *
- * 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.
+ *  Author:    Mikko Ala-Fossi            <maf@iki.fi>
+ *             Jan Evert van Grootheest   <janevert@iae.nl>
  *
- * -=- malafoss@snakemail.hut.fi -=- searching the marvels of universe -=-
+ *  Try:  http://www.maf.iki.fi/~maf/ht6560b/
  */
 
-#undef REALLY_SLOW_IO           /* most systems can safely undef this */
+#define HT6560B_VERSION "v0.07"
+
+#undef REALLY_SLOW_IO		/* most systems can safely undef this */
 
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -63,175 +52,291 @@
 
 #include "ide_modes.h"
 
-/*
- * This routine handles interface switching for the peculiar hardware design
- * on the F.G.I./Holtek HT-6560B VLB IDE interface.
- * The HT-6560B can only enable one IDE port at a time, and requires a
- * silly sequence (below) whenever we switch between primary and secondary.
- *
- * This stuff is courtesy of malafoss@snakemail.hut.fi
- *                          (or maf@nemesis.tky.hut.fi)
- *
- * At least one user has reported that this code can confuse the floppy
- * controller and/or driver -- perhaps this should be changed to use
- * a read-modify-write sequence, so as not to disturb other bits in the reg?
- */
+/* #define DEBUG */  /* remove comments for DEBUG messages */
 
 /*
- * The special i/o-port that HT-6560B uses to select interfaces:
+ * The special i/o-port that HT-6560B uses to configuration:
+ *    bit0 (0x01): "1" selects secondary interface
+ *    bit2 (0x04): "1" enables FIFO function
+ *    bit5 (0x20): "1" enables prefetched data read function  (???)
+ *
+ * The special i/o-port that HT-6560A uses to configuration:
+ *    bit0 (0x01): "1" selects secondary interface
+ *    bit1 (0x02): "1" enables prefetched data read function
+ *    bit2 (0x04): "0" enables multi-master system	      (?)
+ *    bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time	      (?)
  */
-#define HT_SELECT_PORT     0x3e6
-
+#define HT_CONFIG_PORT	  0x3e6
+#define HT_CONFIG(drivea) (byte)(((drivea)->drive_data & 0xff00) >> 8)
 /*
- * We don't know what all of the bits are for, but we *do* know about these:
- *	bit5 (0x20): "1" selects slower speed by disabling use of timing values
- *	bit0 (0x01): "1" selects second interface
+ * FIFO + PREFETCH (both a/b-model)
  */
-static byte ht6560b_selects [2][MAX_DRIVES] = {{0x3c,0x3c}, {0x3d,0x3d}};
+#define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
+/* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
+#define HT_SECONDARY_IF	  0x01
+#define HT_PREFETCH_MODE  0x20
 
 /*
- * VLB ht6560b Timing values:
+ * ht6560b Timing values:
+ *
+ * I reviewed some assembler source 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.
  *
  * Timing byte consists of
- *      High nibble:  Recovery Time  (rt)
- *           The valid values range from 2 to 15. The default is 15.
+ *	High nibble:  Recovery Cycle 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.
+ *	Low nibble:   Active Cycle 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.
- *
- * Here's an example to 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
  */
+#define HT_TIMING(drivea) (byte)((drivea)->drive_data & 0x00ff)
+#define HT_TIMING_DEFAULT 0xff
 
-static byte ht6560b_timings [2][MAX_DRIVES] = {{0xff,0xff}, {0xff,0xff}};
-
-static byte pio_to_timings[6] = {0xff, 0xaa, 0x45, 0x24, 0x13, 0x12};
+/*
+ * This routine handles interface switching for the peculiar hardware design
+ * on the F.G.I./Holtek HT-6560B VLB IDE interface.
+ * The HT-6560B can only enable one IDE port at a time, and requires a
+ * silly sequence (below) whenever we switch between primary and secondary.
+ */
 
 /*
  * 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;
 	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];
-
+	byte select, timing;
+	
+	__save_flags (flags);	/* local CPU only */
+	__cli();		/* local CPU only */
+	
+	select = HT_CONFIG(drive);
+	timing = HT_TIMING(drive);
+	
 	if (select != current_select || timing != current_timing) {
 		current_select = select;
 		current_timing = timing;
-		__save_flags (flags);	/* local CPU only */
-		__cli();		/* local CPU only */
-		(void) inb(HT_SELECT_PORT);
-		(void) inb(HT_SELECT_PORT);
-		(void) inb(HT_SELECT_PORT);
+		if (drive->media != ide_disk || !drive->present)
+			select |= HT_PREFETCH_MODE;
+		(void) inb(HT_CONFIG_PORT);
+		(void) inb(HT_CONFIG_PORT);
+		(void) inb(HT_CONFIG_PORT);
+		(void) inb(HT_CONFIG_PORT);
+		outb(select, HT_CONFIG_PORT);
 		/*
-		 * Note: input bits are reversed to output bits!!
+		 * Set timing for this drive:
 		 */
-		t = inb(HT_SELECT_PORT) ^ 0x3f;
-		t &= (~0x21);
-		t |= (current_select & 0x21);
-		outb(t, HT_SELECT_PORT);
-                /*
-                 * Set timing for this drive:
-                 */
-                outb (timing, IDE_SELECT_REG);
-                (void) inb (IDE_STATUS_REG);
-		__restore_flags (flags);	/* local CPU only */
+		outb(timing, IDE_SELECT_REG);
+		(void) inb(IDE_STATUS_REG);
 #ifdef DEBUG
-		printk("ht6560b: %s: select=%#x timing=%#x\n", drive->name, t, timing);
+		printk("ht6560b: %s: select=%#x timing=%#x\n", drive->name, select, timing);
 #endif
 	}
+	__restore_flags (flags);	/* local CPU only */
 }
 
 /*
  * Autodetection and initialization of ht6560b
  */
-int try_to_init_ht6560b(void)
+static int __init try_to_init_ht6560b(void)
 {
 	byte orig_value;
 	int i;
-
+	
 	/* Autodetect ht6560b */
-	if ((orig_value=inb(HT_SELECT_PORT)) == 0xff)
+	if ((orig_value=inb(HT_CONFIG_PORT)) == 0xff)
 		return 0;
-
+	
 	for (i=3;i>0;i--) {
-		outb(0x00, HT_SELECT_PORT);
-		if (!( (~inb(HT_SELECT_PORT)) & 0x3f )) {
-			  outb(orig_value, HT_SELECT_PORT);
-			  return 0;
+		outb(0x00, HT_CONFIG_PORT);
+		if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
+			outb(orig_value, HT_CONFIG_PORT);
+			return 0;
 		}
 	}
-	outb(0x00, HT_SELECT_PORT);
-	if ((~inb(HT_SELECT_PORT))& 0x3f) {
-		outb(orig_value, HT_SELECT_PORT);
+	outb(0x00, HT_CONFIG_PORT);
+	if ((~inb(HT_CONFIG_PORT))& 0x3f) {
+		outb(orig_value, HT_CONFIG_PORT);
 		return 0;
 	}
 	/*
-	 * Ht6560b autodetected:
-	 *     reverse input bits to output bits
-	 *     initialize bit1 to 0
+	 * Ht6560b autodetected
 	 */
-	outb((orig_value ^ 0x3f) & 0xfd, HT_SELECT_PORT);
-
-	printk("\nht6560b: detected and initialized");
+	outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
+	outb(HT_TIMING_DEFAULT, 0x1f6);  /* IDE_SELECT_REG */
+	(void) inb(0x1f7);               /* IDE_STATUS_REG */
+	
+	printk("\nht6560b " HT6560B_VERSION
+	       ": chipset detected and initialized"
+#ifdef DEBUG
+	       " with debug enabled"
+#endif
+		);
 	return 1;
 }
 
-static void tune_ht6560b (ide_drive_t *drive, byte pio)
+static byte ht_pio2timings(ide_drive_t *drive, byte pio)
 {
-	unsigned int hwif, unit;
+	int bus_speed, active_time, recovery_time;
+	int active_cycles, recovery_cycles;
+	ide_pio_data_t d;
+	
+        if (pio) {
+		pio = ide_get_best_pio_mode(drive, pio, 5, &d);
+		
+		/*
+		 *  Just like opti621.c we try to calculate the
+		 *  actual cycle time for recovery and activity
+		 *  according system bus speed.
+		 */
+		bus_speed = ide_system_bus_speed();
+		active_time = ide_pio_timings[pio].active_time;
+		recovery_time = d.cycle_time 
+			- active_time
+			- ide_pio_timings[pio].setup_time;
+		/*
+		 *  Cycle times should be Vesa bus cycles
+		 */
+		active_cycles   = (active_time   * bus_speed + 999) / 1000;
+		recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
+		/*
+		 *  Upper and lower limits
+		 */
+		if (active_cycles   < 2)  active_cycles   = 2;
+		if (recovery_cycles < 2)  recovery_cycles = 2;
+		if (active_cycles   > 15) active_cycles   = 15;
+		if (recovery_cycles > 15) recovery_cycles = 0;  /* 0==16 */
+		
+#ifdef DEBUG
+		printk("ht6560b: drive %s setting pio=%d recovery=%d (%dns) active=%d (%dns)\n", drive->name, pio, recovery_cycles, recovery_time, active_cycles, active_time);
+#endif
+		
+		return (byte)((recovery_cycles << 4) | active_cycles);
+	} else {
+		
+#ifdef DEBUG
+		printk("ht6560b: drive %s setting pio=0\n", drive->name);
+#endif
+		
+		return HT_TIMING_DEFAULT;    /* default setting */
+	}
+}
+
+/*
+ *  Enable/Disable so called prefetch mode
+ */
+static void ht_set_prefetch(ide_drive_t *drive, byte state)
+{
+	unsigned long flags;
+	int t = HT_PREFETCH_MODE << 8;
+	
+	save_flags (flags);	/* all CPUs */
+	cli();		        /* all CPUs */
+	
+	/*
+	 *  Prefetch mode and unmask irq seems to conflict
+	 */
+	if (state) {
+		drive->drive_data |= t;   /* enable prefetch mode */
+		drive->no_unmask = 1;
+		drive->unmask = 0;
+	} else {
+		drive->drive_data &= ~t;  /* disable prefetch mode */
+		drive->no_unmask = 0;
+	}
+	
+	restore_flags (flags);	/* all CPUs */
+	
+#ifdef DEBUG
+	printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
+#endif
+}
 
-	if (pio == 255)  {	/* auto-tune */
-		if (drive->media != ide_disk)
-			pio = 0; /* some CDROMs don't like fast modes (?) */
-		else
-			pio = ide_get_best_pio_mode(drive, pio, 5, NULL);
-	}
-	unit = drive->select.b.unit;
-	hwif = HWIF(drive)->index;
-	ht6560b_timings[hwif][unit] = pio_to_timings[pio];
-	if (pio == 0)
-		ht6560b_selects[hwif][unit] |= 0x20;
-	else
-		ht6560b_selects[hwif][unit] &= ~0x20;
+static void tune_ht6560b (ide_drive_t *drive, byte pio)
+{
+	unsigned long flags;
+	byte timing;
+	
+	switch (pio) {
+	case 8:         /* set prefetch off */
+	case 9:         /* set prefetch on */
+		ht_set_prefetch(drive, pio & 1);
+		return;
+	}
+	
+	timing = ht_pio2timings(drive, pio);
+	
+	save_flags (flags);	/* all CPUs */
+	cli();		        /* all CPUs */
+	
+	drive->drive_data &= 0xff00;
+	drive->drive_data |= timing;
+	
+	restore_flags (flags);	/* all CPUs */
+	
+#ifdef DEBUG
+	printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
+#endif
 }
 
-void init_ht6560b (void)
+void __init init_ht6560b (void)
 {
-	if (check_region(HT_SELECT_PORT,1)) {
-		printk("\nht6560b: PORT 0x3e6 ALREADY IN USE\n");
+	int t;
+	
+	if (check_region(HT_CONFIG_PORT,1)) {
+		printk(KERN_ERR "ht6560b: PORT %#x ALREADY IN USE\n", HT_CONFIG_PORT);
 	} else {
 		if (try_to_init_ht6560b()) {
-			request_region(HT_SELECT_PORT, 1, ide_hwifs[0].name);
+			request_region(HT_CONFIG_PORT, 1, ide_hwifs[0].name);
 			ide_hwifs[0].chipset = ide_ht6560b;
 			ide_hwifs[1].chipset = ide_ht6560b;
 			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;
-			ide_hwifs[1].serialized = 1;
+			ide_hwifs[0].serialized = 1;  /* is this needed? */
+			ide_hwifs[1].serialized = 1;  /* is this needed? */
 			ide_hwifs[0].mate = &ide_hwifs[1];
 			ide_hwifs[1].mate = &ide_hwifs[0];
 			ide_hwifs[1].channel = 1;
+			
+			/*
+			 * Setting default configurations for drives
+			 */
+			t = (HT_CONFIG_DEFAULT << 8);
+			t |= HT_TIMING_DEFAULT;
+			ide_hwifs[0].drives[0].drive_data = t;
+			ide_hwifs[0].drives[1].drive_data = t;
+			t |= (HT_SECONDARY_IF << 8);
+			ide_hwifs[1].drives[0].drive_data = t;
+			ide_hwifs[1].drives[1].drive_data = t;
 		} else
-			printk("\nht6560b: not found\n");
+			printk(KERN_ERR "ht6560b: not found\n");
 	}
 }
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