aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ide/legacy/ht6560b.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/ide/legacy/ht6560b.c')
-rw-r--r--drivers/ide/legacy/ht6560b.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/drivers/ide/legacy/ht6560b.c b/drivers/ide/legacy/ht6560b.c
new file mode 100644
index 000000000000..a77fb249d5cf
--- /dev/null
+++ b/drivers/ide/legacy/ht6560b.c
@@ -0,0 +1,370 @@
+/*
+ * linux/drivers/ide/legacy/ht6560b.c Version 0.07 Feb 1, 2000
+ *
+ * Copyright (C) 1995-2000 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
+ *
+ * Version 0.05 PIO mode cycle timings auto-tune using bus-speed
+ *
+ * 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.
+ *
+ * Version 0.07 Trying to fix CD-ROM detection problem.
+ * "Prefetch" mode bit OFF for ide disks and
+ * ON for anything else.
+ *
+ *
+ * HT-6560B EIDE-controller support
+ * To activate controller support use kernel parameter "ide0=ht6560b".
+ * Use hdparm utility to enable PIO mode support.
+ *
+ * Author: Mikko Ala-Fossi <maf@iki.fi>
+ * Jan Evert van Grootheest <janevert@iae.nl>
+ *
+ * Try: http://www.maf.iki.fi/~maf/ht6560b/
+ */
+
+#define HT6560B_VERSION "v0.07"
+
+#undef REALLY_SLOW_IO /* most systems can safely undef this */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+/* #define DEBUG */ /* remove comments for DEBUG messages */
+
+/*
+ * 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_CONFIG_PORT 0x3e6
+#define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
+/*
+ * FIFO + PREFETCH (both a/b-model)
+ */
+#define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
+/* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
+#define HT_SECONDARY_IF 0x01
+#define HT_PREFETCH_MODE 0x20
+
+/*
+ * 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 Cycle Time (rt)
+ * 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.
+ */
+#define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
+#define HT_TIMING_DEFAULT 0xff
+
+/*
+ * 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)
+{
+ unsigned long flags;
+ static u8 current_select = 0;
+ static u8 current_timing = 0;
+ u8 select, timing;
+
+ local_irq_save(flags);
+
+ select = HT_CONFIG(drive);
+ timing = HT_TIMING(drive);
+
+ if (select != current_select || timing != current_timing) {
+ current_select = select;
+ current_timing = timing;
+ if (drive->media != ide_disk || !drive->present)
+ select |= HT_PREFETCH_MODE;
+ (void) HWIF(drive)->INB(HT_CONFIG_PORT);
+ (void) HWIF(drive)->INB(HT_CONFIG_PORT);
+ (void) HWIF(drive)->INB(HT_CONFIG_PORT);
+ (void) HWIF(drive)->INB(HT_CONFIG_PORT);
+ HWIF(drive)->OUTB(select, HT_CONFIG_PORT);
+ /*
+ * Set timing for this drive:
+ */
+ HWIF(drive)->OUTB(timing, IDE_SELECT_REG);
+ (void) HWIF(drive)->INB(IDE_STATUS_REG);
+#ifdef DEBUG
+ printk("ht6560b: %s: select=%#x timing=%#x\n",
+ drive->name, select, timing);
+#endif
+ }
+ local_irq_restore(flags);
+}
+
+/*
+ * Autodetection and initialization of ht6560b
+ */
+static int __init try_to_init_ht6560b(void)
+{
+ u8 orig_value;
+ int i;
+
+ /* Autodetect ht6560b */
+ if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
+ return 0;
+
+ for (i=3;i>0;i--) {
+ outb(0x00, HT_CONFIG_PORT);
+ if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
+ outb(orig_value, HT_CONFIG_PORT);
+ return 0;
+ }
+ }
+ outb(0x00, HT_CONFIG_PORT);
+ if ((~inb(HT_CONFIG_PORT))& 0x3f) {
+ outb(orig_value, HT_CONFIG_PORT);
+ return 0;
+ }
+ /*
+ * Ht6560b autodetected
+ */
+ 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 u8 ht_pio2timings(ide_drive_t *drive, u8 pio)
+{
+ int active_time, recovery_time;
+ int active_cycles, recovery_cycles;
+ ide_pio_data_t d;
+ int bus_speed = system_bus_clock();
+
+ 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.
+ */
+ 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 (u8)((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, u8 state)
+{
+ unsigned long flags;
+ int t = HT_PREFETCH_MODE << 8;
+
+ spin_lock_irqsave(&ide_lock, flags);
+
+ /*
+ * 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;
+ }
+
+ spin_unlock_irqrestore(&ide_lock, flags);
+
+#ifdef DEBUG
+ printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
+#endif
+}
+
+static void tune_ht6560b (ide_drive_t *drive, u8 pio)
+{
+ unsigned long flags;
+ u8 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);
+
+ spin_lock_irqsave(&ide_lock, flags);
+
+ drive->drive_data &= 0xff00;
+ drive->drive_data |= timing;
+
+ spin_unlock_irqrestore(&ide_lock, flags);
+
+#ifdef DEBUG
+ printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
+#endif
+}
+
+/* Can be called directly from ide.c. */
+int __init ht6560b_init(void)
+{
+ ide_hwif_t *hwif, *mate;
+ int t;
+
+ hwif = &ide_hwifs[0];
+ mate = &ide_hwifs[1];
+
+ if (!request_region(HT_CONFIG_PORT, 1, hwif->name)) {
+ printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
+ __FUNCTION__);
+ return -ENODEV;
+ }
+
+ if (!try_to_init_ht6560b()) {
+ printk(KERN_NOTICE "%s: HBA not found\n", __FUNCTION__);
+ goto release_region;
+ }
+
+ hwif->chipset = ide_ht6560b;
+ hwif->selectproc = &ht6560b_selectproc;
+ hwif->tuneproc = &tune_ht6560b;
+ hwif->serialized = 1; /* is this needed? */
+ hwif->mate = mate;
+
+ mate->chipset = ide_ht6560b;
+ mate->selectproc = &ht6560b_selectproc;
+ mate->tuneproc = &tune_ht6560b;
+ mate->serialized = 1; /* is this needed? */
+ mate->mate = hwif;
+ mate->channel = 1;
+
+ /*
+ * Setting default configurations for drives
+ */
+ t = (HT_CONFIG_DEFAULT << 8);
+ t |= HT_TIMING_DEFAULT;
+ hwif->drives[0].drive_data = t;
+ hwif->drives[1].drive_data = t;
+
+ t |= (HT_SECONDARY_IF << 8);
+ mate->drives[0].drive_data = t;
+ mate->drives[1].drive_data = t;
+
+ probe_hwif_init(hwif);
+ probe_hwif_init(mate);
+
+ create_proc_ide_interfaces();
+
+ return 0;
+
+release_region:
+ release_region(HT_CONFIG_PORT, 1);
+ return -ENODEV;
+}
+
+#ifdef MODULE
+module_init(ht6560b_init);
+#endif
+
+MODULE_AUTHOR("See Local File");
+MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
+MODULE_LICENSE("GPL");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.