/*

   *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
   */
  
  /*
   *  Principal Author/Maintainer:  PODIEN@hml2.atlas.de (Wolfram Podien)
   *
   *  This file provides support for the advanced features
   *  of the UMC 8672 IDE interface.
   *
   *  Version 0.01	Initial version, hacked out of ide.c,
   *			and #include'd rather than compiled separately.
   *			This will get cleaned up in a subsequent release.
   *
   *  Version 0.02	now configs/compiles separate from ide.c  -ml
   *  Version 0.03	enhanced auto-tune, fix display bug
   *  Version 0.05	replace sti() with restore_flags()  -ml
   *			add detection of possible race condition  -ml
   */
  
  /*

   * VLB Controller Support from

   * Wolfram Podien
   * Rohoefe 3
   * D28832 Achim
   * Germany
   *
   * To enable UMC8672 support there must a lilo line like
   * append="ide0=umc8672"...
   * To set the speed according to the abilities of the hardware there must be a
   * line like
   * #define UMC_DRIVE0 11
   * in the beginning of the driver, which sets the speed of drive 0 to 11 (there
   * are some lines present). 0 - 11 are allowed speed values. These values are

   * the results from the DOS speed test program supplied from UMC. 11 is the

   * highest speed (about PIO mode 3)
   */
  #define REALLY_SLOW_IO		/* some systems can safely undef this */
  
  #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 DRV_NAME "umc8672"

  /*
   * Default speeds.  These can be changed with "auto-tune" and/or hdparm.
   */
  #define UMC_DRIVE0      1              /* DOS measured drive speeds */
  #define UMC_DRIVE1      1              /* 0 to 11 allowed */
  #define UMC_DRIVE2      1              /* 11 = Fastest Speed */
  #define UMC_DRIVE3      1              /* In case of crash reduce speed */
  
  static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};

  static const u8 pio_to_umc [5] = {0, 3, 7, 10, 11};	/* rough guesses */

  
  /*       0    1    2    3    4    5    6    7    8    9    10   11      */
  static const u8 speedtab [3][12] = {

  	{0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
  	{0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
  	{0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0}
  };

  static void out_umc(char port, char wert)

  {

  	outb_p(port, 0x108);
  	outb_p(wert, 0x109);

  }

  static inline u8 in_umc(char port)

  {

  	outb_p(port, 0x108);

  	return inb_p(0x109);
  }

  static void umc_set_speeds(u8 speeds[])

  {
  	int i, tmp;

  	outb_p(0x5A, 0x108); /* enable umc */

  	out_umc(0xd7, (speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
  	out_umc(0xd6, (speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));

  	tmp = 0;

  	for (i = 3; i >= 0; i--)

  		tmp = (tmp << 2) | speedtab[1][speeds[i]];

  	out_umc(0xdc, tmp);
  	for (i = 0; i < 4; i++) {
  		out_umc(0xd0 + i, speedtab[2][speeds[i]]);
  		out_umc(0xd8 + i, speedtab[2][speeds[i]]);

  	}

  	outb_p(0xa5, 0x108); /* disable umc */

  	printk("umc8672: drive speeds [0 to 11]: %d %d %d %d
  ",

  		speeds[0], speeds[1], speeds[2], speeds[3]);
  }

  static void umc_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)

  {

  	ide_hwif_t *mate = hwif->mate;

  	unsigned long uninitialized_var(flags);

  	const u8 pio = drive->pio_mode - XFER_PIO_0;

  	printk("%s: setting umc8672 to PIO mode%d (speed %d)
  ",
  		drive->name, pio, pio_to_umc[pio]);

  	if (mate)
  		spin_lock_irqsave(&mate->lock, flags);
  	if (mate && mate->handler) {

  		printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()
  ");
  	} else {
  		current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];

  		umc_set_speeds(current_speeds);

  	}

  	if (mate)
  		spin_unlock_irqrestore(&mate->lock, flags);

  }

  static const struct ide_port_ops umc8672_port_ops = {
  	.set_pio_mode		= umc_set_pio_mode,
  };

  static const struct ide_port_info umc8672_port_info __initconst = {

  	.name			= DRV_NAME,

  	.chipset		= ide_umc8672,

  	.port_ops		= &umc8672_port_ops,

  	.host_flags		= IDE_HFLAG_NO_DMA,

  	.pio_mask		= ATA_PIO4,
  };

  static int __init umc8672_probe(void)
  {

  	unsigned long flags;

  
  	if (!request_region(0x108, 2, "umc8672")) {
  		printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.
  ");
  		return 1;
  	}
  	local_irq_save(flags);

  	outb_p(0x5A, 0x108); /* enable umc */

  	if (in_umc (0xd5) != 0xa0) {
  		local_irq_restore(flags);
  		printk(KERN_ERR "umc8672: not found
  ");
  		release_region(0x108, 2);

  		return 1;

  	}

  	outb_p(0xa5, 0x108); /* disable umc */

  	umc_set_speeds(current_speeds);

  	local_irq_restore(flags);

  	return ide_legacy_device_add(&umc8672_port_info, 0);

  }

  static bool probe_umc8672;

  
  module_param_named(probe, probe_umc8672, bool, 0);
  MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");

  static int __init umc8672_init(void)

  {

  	if (probe_umc8672 == 0)
  		goto out;
  
  	if (umc8672_probe() == 0)

  		return 0;

  out:

  	return -ENODEV;

  }

  module_init(umc8672_init);

  
  MODULE_AUTHOR("Wolfram Podien");
  MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
  MODULE_LICENSE("GPL");