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Diffstat (limited to 'drivers/ide/ht6560b.c')
-rw-r--r--drivers/ide/ht6560b.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/drivers/ide/ht6560b.c b/drivers/ide/ht6560b.c
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index 000000000000..c7e5c2246b79
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+++ b/drivers/ide/ht6560b.c
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+/*
+ * Copyright (C) 1995-2000 Linus Torvalds & author (see below)
+ */
+
+/*
+ * 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 <j.e.van.grootheest@caiway.nl>
+ *
+ * Try: http://www.maf.iki.fi/~maf/ht6560b/
+ */
+
+#define DRV_NAME "ht6560b"
+#define HT6560B_VERSION "v0.08"
+
+#include <linux/module.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/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 Select register 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)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ 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);
+
+ /*
+ * Need to enforce prefetch sometimes because otherwise
+ * it'll hang (hard).
+ */
+ if (drive->media != ide_disk ||
+ (drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
+ select |= HT_PREFETCH_MODE;
+
+ if (select != current_select || timing != current_timing) {
+ current_select = select;
+ current_timing = timing;
+ (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);
+ /*
+ * Set timing for this drive:
+ */
+ outb(timing, hwif->io_ports.device_addr);
+ (void)inb(hwif->io_ports.status_addr);
+#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); /* Select register */
+ (void)inb(0x1f7); /* Status register */
+
+ printk("ht6560b " HT6560B_VERSION
+ ": chipset detected and initialized"
+#ifdef DEBUG
+ " with debug enabled"
+#endif
+ "\n"
+ );
+ return 1;
+}
+
+static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
+{
+ int active_time, recovery_time;
+ int active_cycles, recovery_cycles;
+ int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
+
+ if (pio) {
+ unsigned int cycle_time;
+ struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
+
+ cycle_time = ide_pio_cycle_time(drive, pio);
+
+ /*
+ * Just like opti621.c we try to calculate the
+ * actual cycle time for recovery and activity
+ * according system bus speed.
+ */
+ active_time = t->active;
+ recovery_time = cycle_time - active_time - t->setup;
+ /*
+ * 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 */
+ }
+}
+
+static DEFINE_SPINLOCK(ht6560b_lock);
+
+/*
+ * 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(&ht6560b_lock, flags);
+
+ /*
+ * Prefetch mode and unmask irq seems to conflict
+ */
+ if (state) {
+ drive->drive_data |= t; /* enable prefetch mode */
+ drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
+ drive->dev_flags &= ~IDE_DFLAG_UNMASK;
+ } else {
+ drive->drive_data &= ~t; /* disable prefetch mode */
+ drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
+ }
+
+ spin_unlock_irqrestore(&ht6560b_lock, flags);
+
+#ifdef DEBUG
+ printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
+#endif
+}
+
+static void ht6560b_set_pio_mode(ide_drive_t *drive, const 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(&ht6560b_lock, flags);
+ drive->drive_data &= 0xff00;
+ drive->drive_data |= timing;
+ spin_unlock_irqrestore(&ht6560b_lock, flags);
+
+#ifdef DEBUG
+ printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
+#endif
+}
+
+static void __init ht6560b_init_dev(ide_drive_t *drive)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ /* Setting default configurations for drives. */
+ int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
+
+ if (hwif->channel)
+ t |= (HT_SECONDARY_IF << 8);
+
+ drive->drive_data = t;
+}
+
+static int probe_ht6560b;
+
+module_param_named(probe, probe_ht6560b, bool, 0);
+MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
+
+static const struct ide_port_ops ht6560b_port_ops = {
+ .init_dev = ht6560b_init_dev,
+ .set_pio_mode = ht6560b_set_pio_mode,
+ .selectproc = ht6560b_selectproc,
+};
+
+static const struct ide_port_info ht6560b_port_info __initdata = {
+ .name = DRV_NAME,
+ .chipset = ide_ht6560b,
+ .port_ops = &ht6560b_port_ops,
+ .host_flags = IDE_HFLAG_SERIALIZE | /* is this needed? */
+ IDE_HFLAG_NO_DMA |
+ IDE_HFLAG_ABUSE_PREFETCH,
+ .pio_mask = ATA_PIO4,
+};
+
+static int __init ht6560b_init(void)
+{
+ if (probe_ht6560b == 0)
+ return -ENODEV;
+
+ if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
+ printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ if (!try_to_init_ht6560b()) {
+ printk(KERN_NOTICE "%s: HBA not found\n", __func__);
+ goto release_region;
+ }
+
+ return ide_legacy_device_add(&ht6560b_port_info, 0);
+
+release_region:
+ release_region(HT_CONFIG_PORT, 1);
+ return -ENODEV;
+}
+
+module_init(ht6560b_init);
+
+MODULE_AUTHOR("See Local File");
+MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
+MODULE_LICENSE("GPL");
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