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dtc2278.c

/*
 *  linux/drivers/ide/legacy/dtc2278.c          Version 0.02      Feb 10, 1996
 *
 *  Copyright (C) 1996  Linus Torvalds & author (see below)
 */

#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/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/io.h>

/*
 * Changing this #undef to #define may solve start up problems in some systems.
 */
#undef ALWAYS_SET_DTC2278_PIO_MODE

/*
 * From: andy@cercle.cts.com (Dyan Wile)
 *
 * Below is a patch for DTC-2278 - alike software-programmable controllers
 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
 * the primary (EIDE). You may probably have to enable the 32-bit support to
 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
 * filesystem  corrupted with -u1, but under heavy disk load only :-)
 *
 * This card is now forced to use the "serialize" feature,
 * and irq-unmasking is disallowed.  If io_32bit is enabled,
 * it must be done for BOTH drives on each interface.
 *
 * This code was written for the DTC2278E, but might work with any of these:
 *
 * DTC2278S has only a single IDE interface.
 * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
 * DTC2278E also has serial ports and a printer port
 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
 *
 * There may be a fourth controller type. The S and D versions use the
 * Winbond chip, and I think the E version does also.
 *
 */

static void sub22 (char b, char c)
{
      int i;

      for(i = 0; i < 3; ++i) {
            inb(0x3f6);
            outb_p(b,0xb0);
            inb(0x3f6);
            outb_p(c,0xb4);
            inb(0x3f6);
            if(inb(0xb4) == c) {
                  outb_p(7,0xb0);
                  inb(0x3f6);
                  return;     /* success */
            }
      }
}

static DEFINE_SPINLOCK(dtc2278_lock);

static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
      unsigned long flags;

      if (pio >= 3) {
            spin_lock_irqsave(&dtc2278_lock, flags);
            /*
             * This enables PIO mode4 (3?) on the first interface
             */
            sub22(1,0xc3);
            sub22(0,0xa0);
            spin_unlock_irqrestore(&dtc2278_lock, flags);
      } else {
            /* we don't know how to set it back again.. */
            /* Actually we do - there is a data sheet available for the
               Winbond but does anyone actually care */
      }

      /*
       * 32bit I/O has to be enabled for *both* drives at the same time.
       */
      drive->io_32bit = 1;
      HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
}

static int __init dtc2278_probe(void)
{
      unsigned long flags;
      ide_hwif_t *hwif, *mate;
      static u8 idx[4] = { 0, 1, 0xff, 0xff };

      hwif = &ide_hwifs[0];
      mate = &ide_hwifs[1];

      if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
            return 1;

      local_irq_save(flags);
      /*
       * This enables the second interface
       */
      outb_p(4,0xb0);
      inb(0x3f6);
      outb_p(0x20,0xb4);
      inb(0x3f6);
#ifdef ALWAYS_SET_DTC2278_PIO_MODE
      /*
       * This enables PIO mode4 (3?) on the first interface
       * and may solve start-up problems for some people.
       */
      sub22(1,0xc3);
      sub22(0,0xa0);
#endif
      local_irq_restore(flags);

      hwif->serialized = 1;
      hwif->chipset = ide_dtc2278;
      hwif->pio_mask = ATA_PIO4;
      hwif->set_pio_mode = &dtc2278_set_pio_mode;
      hwif->drives[0].no_unmask = 1;
      hwif->drives[1].no_unmask = 1;
      hwif->mate = mate;

      mate->serialized = 1;
      mate->chipset = ide_dtc2278;
      mate->pio_mask = ATA_PIO4;
      mate->drives[0].no_unmask = 1;
      mate->drives[1].no_unmask = 1;
      mate->mate = hwif;
      mate->channel = 1;

      ide_device_add(idx);

      return 0;
}

int probe_dtc2278 = 0;

module_param_named(probe, probe_dtc2278, bool, 0);
MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");

/* Can be called directly from ide.c. */
int __init dtc2278_init(void)
{
      if (probe_dtc2278 == 0)
            return -ENODEV;

      if (dtc2278_probe()) {
            printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
            return -EBUSY;
      }
      return 0;
}

#ifdef MODULE
module_init(dtc2278_init);
#endif

MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
MODULE_LICENSE("GPL");

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