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cmd640.c

/*
 *  linux/drivers/ide/pci/cmd640.c        Version 1.02  Sep 01, 1996
 *
 *  Copyright (C) 1995-1996  Linus Torvalds & authors (see below)
 */

/*
 *  Original authors:   abramov@cecmow.enet.dec.com (Igor Abramov)
 *                mlord@pobox.com (Mark Lord)
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 *  This file provides support for the advanced features and bugs
 *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
 *
 *  These chips are basically fucked by design, and getting this driver
 *  to work on every motherboard design that uses this screwed chip seems
 *  bloody well impossible.  However, we're still trying.
 *
 *  Version 0.97 worked for everybody.
 *
 *  User feedback is essential.  Many thanks to the beta test team:
 *
 *  A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
 *  bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
 *  chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
 *  derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
 *  flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
 *  j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
 *  kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
 *  peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
 *  s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
 *  steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
 *  liug@mama.indstate.edu, and others.
 *
 *  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  Fixes for vlb initialization code, enable prefetch
 *                for versions 'B' and 'C' of chip by default,
 *                some code cleanup.
 *
 *  Version 0.03  Added reset of secondary interface,
 *                and black list for devices which are not compatible
 *                with prefetch mode. Separate function for setting
 *                prefetch is added, possibly it will be called some
 *                day from ioctl processing code.
 *
 *  Version 0.04  Now configs/compiles separate from ide.c
 *
 *  Version 0.05  Major rewrite of interface timing code.
 *                Added new function cmd640_set_mode to set PIO mode
 *                from ioctl call. New drives added to black list.
 *
 *  Version 0.06  More code cleanup. Prefetch is enabled only for
 *                detected hard drives, not included in prefetch
 *                black list.
 *
 *  Version 0.07  Changed to more conservative drive tuning policy.
 *                Unknown drives, which report PIO < 4 are set to
 *                (reported_PIO - 1) if it is supported, or to PIO0.
 *                List of known drives extended by info provided by
 *                CMD at their ftp site.
 *
 *  Version 0.08  Added autotune/noautotune support.
 *
 *  Version 0.09  Try to be smarter about 2nd port enabling.
 *  Version 0.10  Be nice and don't reset 2nd port.
 *  Version 0.11  Try to handle more weird situations.
 *
 *  Version 0.12  Lots of bug fixes from Laszlo Peter
 *                irq unmasking disabled for reliability.
 *                try to be even smarter about the second port.
 *                tidy up source code formatting.
 *  Version 0.13  permit irq unmasking again.
 *  Version 0.90  massive code cleanup, some bugs fixed.
 *                defaults all drives to PIO mode0, prefetch off.
 *                autotune is OFF by default, with compile time flag.
 *                prefetch can be turned OFF/ON using "hdparm -p8/-p9"
 *                 (requires hdparm-3.1 or newer)
 *  Version 0.91  first release to linux-kernel list.
 *  Version 0.92  move initial reg dump to separate callable function
 *                change "readahead" to "prefetch" to avoid confusion
 *  Version 0.95  respect original BIOS timings unless autotuning.
 *                tons of code cleanup and rearrangement.
 *                added CONFIG_BLK_DEV_CMD640_ENHANCED option
 *                prevent use of unmask when prefetch is on
 *  Version 0.96  prevent use of io_32bit when prefetch is off
 *  Version 0.97  fix VLB secondary interface for sjd@slip.net
 *                other minor tune-ups:  0.96 was very good.
 *  Version 0.98  ignore PCI version when disabled by BIOS
 *  Version 0.99  display setup/active/recovery clocks with PIO mode
 *  Version 1.00  Mmm.. cannot depend on PCMD_ENA in all systems
 *  Version 1.01  slow/fast devsel can be selected with "hdparm -p6/-p7"
 *                 ("fast" is necessary for 32bit I/O in some systems)
 *  Version 1.02  fix bug that resulted in slow "setup times"
 *                 (patch courtesy of Zoltan Hidvegi)
 */

#define CMD640_PREFETCH_MASKS 1

//#define CMD640_DUMP_REGS

#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>

/*
 * This flag is set in ide.c by the parameter:  ide0=cmd640_vlb
 */
int cmd640_vlb = 0;

/*
 * CMD640 specific registers definition.
 */

#define VID       0x00
#define DID       0x02
#define PCMD            0x04
#define   PCMD_ENA      0x01
#define PSTTS           0x06
#define REVID           0x08
#define PROGIF          0x09
#define SUBCL           0x0a
#define BASCL           0x0b
#define BaseA0          0x10
#define BaseA1          0x14
#define BaseA2          0x18
#define BaseA3          0x1c
#define INTLINE         0x3c
#define INPINE          0x3d

#define     CFR         0x50
#define   CFR_DEVREV          0x03
#define   CFR_IDE01INTR       0x04
#define       CFR_DEVID       0x18
#define       CFR_AT_VESA_078h      0x20
#define       CFR_DSA1        0x40
#define       CFR_DSA0        0x80

#define CNTRL           0x51
#define       CNTRL_DIS_RA0         0x40
#define   CNTRL_DIS_RA1       0x80
#define       CNTRL_ENA_2ND         0x08

#define     CMDTIM            0x52
#define     ARTTIM0           0x53
#define     DRWTIM0           0x54
#define ARTTIM1   0x55
#define DRWTIM1         0x56
#define ARTTIM23  0x57
#define   ARTTIM23_DIS_RA2    0x04
#define   ARTTIM23_DIS_RA3    0x08
#define DRWTIM23  0x58
#define BRST            0x59

/*
 * Registers and masks for easy access by drive index:
 */
static u8 prefetch_regs[4]  = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};

#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED

static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};

/*
 * Current cmd640 timing values for each drive.
 * The defaults for each are the slowest possible timings.
 */
static u8 setup_counts[4]    = {4, 4, 4, 4};     /* Address setup count (in clocks) */
static u8 active_counts[4]   = {16, 16, 16, 16}; /* Active count   (encoded) */
static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */

#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

static DEFINE_SPINLOCK(cmd640_lock);

/*
 * These are initialized to point at the devices we control
 */
static ide_hwif_t  *cmd_hwif0, *cmd_hwif1;
static ide_drive_t *cmd_drives[4];

/*
 * Interface to access cmd640x registers
 */
static unsigned int cmd640_key;
static void (*__put_cmd640_reg)(u16 reg, u8 val);
static u8 (*__get_cmd640_reg)(u16 reg);

/*
 * This is read from the CFR reg, and is used in several places.
 */
static unsigned int cmd640_chip_version;

/*
 * The CMD640x chip does not support DWORD config write cycles, but some
 * of the BIOSes use them to implement the config services.
 * Therefore, we must use direct IO instead.
 */

/* PCI method 1 access */

static void put_cmd640_reg_pci1 (u16 reg, u8 val)
{
      outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
      outb_p(val, (reg & 3) | 0xcfc);
}

static u8 get_cmd640_reg_pci1 (u16 reg)
{
      outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
      return inb_p((reg & 3) | 0xcfc);
}

/* PCI method 2 access (from CMD datasheet) */

static void put_cmd640_reg_pci2 (u16 reg, u8 val)
{
      outb_p(0x10, 0xcf8);
      outb_p(val, cmd640_key + reg);
      outb_p(0, 0xcf8);
}

static u8 get_cmd640_reg_pci2 (u16 reg)
{
      u8 b;

      outb_p(0x10, 0xcf8);
      b = inb_p(cmd640_key + reg);
      outb_p(0, 0xcf8);
      return b;
}

/* VLB access */

static void put_cmd640_reg_vlb (u16 reg, u8 val)
{
      outb_p(reg, cmd640_key);
      outb_p(val, cmd640_key + 4);
}

static u8 get_cmd640_reg_vlb (u16 reg)
{
      outb_p(reg, cmd640_key);
      return inb_p(cmd640_key + 4);
}

static u8 get_cmd640_reg(u16 reg)
{
      unsigned long flags;
      u8 b;

      spin_lock_irqsave(&cmd640_lock, flags);
      b = __get_cmd640_reg(reg);
      spin_unlock_irqrestore(&cmd640_lock, flags);
      return b;
}

static void put_cmd640_reg(u16 reg, u8 val)
{
      unsigned long flags;

      spin_lock_irqsave(&cmd640_lock, flags);
      __put_cmd640_reg(reg,val);
      spin_unlock_irqrestore(&cmd640_lock, flags);
}

static int __init match_pci_cmd640_device (void)
{
      const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
      unsigned int i;
      for (i = 0; i < 4; i++) {
            if (get_cmd640_reg(i) != ven_dev[i])
                  return 0;
      }
#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
      if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
            printk("ide: cmd640 on PCI disabled by BIOS\n");
            return 0;
      }
#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
      return 1; /* success */
}

/*
 * Probe for CMD640x -- pci method 1
 */
static int __init probe_for_cmd640_pci1 (void)
{
      __get_cmd640_reg = get_cmd640_reg_pci1;
      __put_cmd640_reg = put_cmd640_reg_pci1;
      for (cmd640_key = 0x80000000;
           cmd640_key <= 0x8000f800;
           cmd640_key += 0x800) {
            if (match_pci_cmd640_device())
                  return 1; /* success */
      }
      return 0;
}

/*
 * Probe for CMD640x -- pci method 2
 */
static int __init probe_for_cmd640_pci2 (void)
{
      __get_cmd640_reg = get_cmd640_reg_pci2;
      __put_cmd640_reg = put_cmd640_reg_pci2;
      for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
            if (match_pci_cmd640_device())
                  return 1; /* success */
      }
      return 0;
}

/*
 * Probe for CMD640x -- vlb
 */
static int __init probe_for_cmd640_vlb (void)
{
      u8 b;

      __get_cmd640_reg = get_cmd640_reg_vlb;
      __put_cmd640_reg = put_cmd640_reg_vlb;
      cmd640_key = 0x178;
      b = get_cmd640_reg(CFR);
      if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
            cmd640_key = 0x78;
            b = get_cmd640_reg(CFR);
            if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
                  return 0;
      }
      return 1; /* success */
}

/*
 *  Returns 1 if an IDE interface/drive exists at 0x170,
 *  Returns 0 otherwise.
 */
static int __init secondary_port_responding (void)
{
      unsigned long flags;

      spin_lock_irqsave(&cmd640_lock, flags);

      outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET);  /* select drive0 */
      udelay(100);
      if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) {
            outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */
            udelay(100);
            if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) {
                  spin_unlock_irqrestore(&cmd640_lock, flags);
                  return 0; /* nothing responded */
            }
      }
      spin_unlock_irqrestore(&cmd640_lock, flags);
      return 1; /* success */
}

#ifdef CMD640_DUMP_REGS
/*
 * Dump out all cmd640 registers.  May be called from ide.c
 */
static void cmd640_dump_regs (void)
{
      unsigned int reg = cmd640_vlb ? 0x50 : 0x00;

      /* Dump current state of chip registers */
      printk("ide: cmd640 internal register dump:");
      for (; reg <= 0x59; reg++) {
            if (!(reg & 0x0f))
                  printk("\n%04x:", reg);
            printk(" %02x", get_cmd640_reg(reg));
      }
      printk("\n");
}
#endif

/*
 * Check whether prefetch is on for a drive,
 * and initialize the unmask flags for safe operation.
 */
static void __init check_prefetch (unsigned int index)
{
      ide_drive_t *drive = cmd_drives[index];
      u8 b = get_cmd640_reg(prefetch_regs[index]);

      if (b & prefetch_masks[index]) {    /* is prefetch off? */
            drive->no_unmask = 0;
            drive->no_io_32bit = 1;
            drive->io_32bit = 0;
      } else {
#if CMD640_PREFETCH_MASKS
            drive->no_unmask = 1;
            drive->unmask = 0;
#endif
            drive->no_io_32bit = 0;
      }
}

/*
 * Figure out which devices we control
 */
static void __init setup_device_ptrs (void)
{
      unsigned int i;

      cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */
      cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */
      for (i = 0; i < MAX_HWIFS; i++) {
            ide_hwif_t *hwif = &ide_hwifs[i];
            if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced) {
                  if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0)
                        cmd_hwif0 = hwif;
                  else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
                        cmd_hwif1 = hwif;
            }
      }
      cmd_drives[0] = &cmd_hwif0->drives[0];
      cmd_drives[1] = &cmd_hwif0->drives[1];
      cmd_drives[2] = &cmd_hwif1->drives[0];
      cmd_drives[3] = &cmd_hwif1->drives[1];
}

#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED

/*
 * Sets prefetch mode for a drive.
 */
static void set_prefetch_mode (unsigned int index, int mode)
{
      ide_drive_t *drive = cmd_drives[index];
      unsigned long flags;
      int reg = prefetch_regs[index];
      u8 b;

      spin_lock_irqsave(&cmd640_lock, flags);
      b = __get_cmd640_reg(reg);
      if (mode) { /* want prefetch on? */
#if CMD640_PREFETCH_MASKS
            drive->no_unmask = 1;
            drive->unmask = 0;
#endif
            drive->no_io_32bit = 0;
            b &= ~prefetch_masks[index];  /* enable prefetch */
      } else {
            drive->no_unmask = 0;
            drive->no_io_32bit = 1;
            drive->io_32bit = 0;
            b |= prefetch_masks[index];   /* disable prefetch */
      }
      __put_cmd640_reg(reg, b);
      spin_unlock_irqrestore(&cmd640_lock, flags);
}

/*
 * Dump out current drive clocks settings
 */
static void display_clocks (unsigned int index)
{
      u8 active_count, recovery_count;

      active_count = active_counts[index];
      if (active_count == 1)
            ++active_count;
      recovery_count = recovery_counts[index];
      if (active_count > 3 && recovery_count == 1)
            ++recovery_count;
      if (cmd640_chip_version > 1)
            recovery_count += 1;  /* cmd640b uses (count + 1)*/
      printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
}

/*
 * Pack active and recovery counts into single byte representation
 * used by controller
 */
static inline u8 pack_nibbles (u8 upper, u8 lower)
{
      return ((upper & 0x0f) << 4) | (lower & 0x0f);
}

/*
 * This routine retrieves the initial drive timings from the chipset.
 */
static void __init retrieve_drive_counts (unsigned int index)
{
      u8 b;

      /*
       * Get the internal setup timing, and convert to clock count
       */
      b = get_cmd640_reg(arttim_regs[index]) & ~0x3f;
      switch (b) {
            case 0x00: b = 4; break;
            case 0x80: b = 3; break;
            case 0x40: b = 2; break;
            default:   b = 5; break;
      }
      setup_counts[index] = b;

      /*
       * Get the active/recovery counts
       */
      b = get_cmd640_reg(drwtim_regs[index]);
      active_counts[index]   = (b >> 4)   ? (b >> 4)   : 0x10;
      recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10;
}


/*
 * This routine writes the prepared setup/active/recovery counts
 * for a drive into the cmd640 chipset registers to active them.
 */
static void program_drive_counts (unsigned int index)
{
      unsigned long flags;
      u8 setup_count    = setup_counts[index];
      u8 active_count   = active_counts[index];
      u8 recovery_count = recovery_counts[index];

      /*
       * Set up address setup count and drive read/write timing registers.
       * Primary interface has individual count/timing registers for
       * each drive.  Secondary interface has one common set of registers,
       * so we merge the timings, using the slowest value for each timing.
       */
      if (index > 1) {
            unsigned int mate;
            if (cmd_drives[mate = index ^ 1]->present) {
                  if (setup_count < setup_counts[mate])
                        setup_count = setup_counts[mate];
                  if (active_count < active_counts[mate])
                        active_count = active_counts[mate];
                  if (recovery_count < recovery_counts[mate])
                        recovery_count = recovery_counts[mate];
            }
      }

      /*
       * Convert setup_count to internal chipset representation
       */
      switch (setup_count) {
            case 4:      setup_count = 0x00; break;
            case 3:      setup_count = 0x80; break;
            case 1:
            case 2:      setup_count = 0x40; break;
            default: setup_count = 0xc0; /* case 5 */
      }

      /*
       * Now that everything is ready, program the new timings
       */
      spin_lock_irqsave(&cmd640_lock, flags);
      /*
       * Program the address_setup clocks into ARTTIM reg,
       * and then the active/recovery counts into the DRWTIM reg
       * (this converts counts of 16 into counts of zero -- okay).
       */
      setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
      __put_cmd640_reg(arttim_regs[index], setup_count);
      __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
      spin_unlock_irqrestore(&cmd640_lock, flags);
}

/*
 * Set a specific pio_mode for a drive
 */
static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle_time)
{
      int setup_time, active_time, recovery_time, clock_time;
      u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
      int bus_speed = system_bus_clock();

      if (pio_mode > 5)
            pio_mode = 5;
      setup_time  = ide_pio_timings[pio_mode].setup_time;
      active_time = ide_pio_timings[pio_mode].active_time;
      recovery_time = cycle_time - (setup_time + active_time);
      clock_time = 1000 / bus_speed;
      cycle_count = (cycle_time + clock_time - 1) / clock_time;

      setup_count = (setup_time + clock_time - 1) / clock_time;

      active_count = (active_time + clock_time - 1) / clock_time;
      if (active_count < 2)
            active_count = 2; /* minimum allowed by cmd640 */

      recovery_count = (recovery_time + clock_time - 1) / clock_time;
      recovery_count2 = cycle_count - (setup_count + active_count);
      if (recovery_count2 > recovery_count)
            recovery_count = recovery_count2;
      if (recovery_count < 2)
            recovery_count = 2; /* minimum allowed by cmd640 */
      if (recovery_count > 17) {
            active_count += recovery_count - 17;
            recovery_count = 17;
      }
      if (active_count > 16)
            active_count = 16; /* maximum allowed by cmd640 */
      if (cmd640_chip_version > 1)
            recovery_count -= 1;  /* cmd640b uses (count + 1)*/
      if (recovery_count > 16)
            recovery_count = 16; /* maximum allowed by cmd640 */

      setup_counts[index]    = setup_count;
      active_counts[index]   = active_count;
      recovery_counts[index] = recovery_count;

      /*
       * In a perfect world, we might set the drive pio mode here
       * (using WIN_SETFEATURE) before continuing.
       *
       * But we do not, because:
       *    1) this is the wrong place to do it (proper is do_special() in ide.c)
       *    2) in practice this is rarely, if ever, necessary
       */
      program_drive_counts (index);
}

static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
      unsigned int index = 0, cycle_time;
      u8 b;

      while (drive != cmd_drives[index]) {
            if (++index > 3) {
                  printk(KERN_ERR "%s: bad news in %s\n",
                              drive->name, __FUNCTION__);
                  return;
            }
      }
      switch (pio) {
            case 6: /* set fast-devsel off */
            case 7: /* set fast-devsel on */
                  b = get_cmd640_reg(CNTRL) & ~0x27;
                  if (pio & 1)
                        b |= 0x27;
                  put_cmd640_reg(CNTRL, b);
                  printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, (pio & 1) ? "en" : "dis");
                  return;

            case 8: /* set prefetch off */
            case 9: /* set prefetch on */
                  set_prefetch_mode(index, pio & 1);
                  printk("%s: %sabled cmd640 prefetch\n", drive->name, (pio & 1) ? "en" : "dis");
                  return;
      }

      cycle_time = ide_pio_cycle_time(drive, pio);
      cmd640_set_mode(index, pio, cycle_time);

      printk("%s: selected cmd640 PIO mode%d (%dns)",
            drive->name, pio, cycle_time);

      display_clocks(index);
}

#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

static int pci_conf1(void)
{
      unsigned long flags;
      u32 tmp;

      spin_lock_irqsave(&cmd640_lock, flags);
      outb(0x01, 0xCFB);
      tmp = inl(0xCF8);
      outl(0x80000000, 0xCF8);
      if (inl(0xCF8) == 0x80000000) {
            outl(tmp, 0xCF8);
            spin_unlock_irqrestore(&cmd640_lock, flags);
            return 1;
      }
      outl(tmp, 0xCF8);
      spin_unlock_irqrestore(&cmd640_lock, flags);
      return 0;
}

static int pci_conf2(void)
{
      unsigned long flags;

      spin_lock_irqsave(&cmd640_lock, flags);
      outb(0x00, 0xCFB);
      outb(0x00, 0xCF8);
      outb(0x00, 0xCFA);
      if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
            spin_unlock_irqrestore(&cmd640_lock, flags);
            return 1;
      }
      spin_unlock_irqrestore(&cmd640_lock, flags);
      return 0;
}

/*
 * Probe for a cmd640 chipset, and initialize it if found.  Called from ide.c
 */
int __init ide_probe_for_cmd640x (void)
{
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
      int second_port_toggled = 0;
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
      int second_port_cmd640 = 0;
      const char *bus_type, *port2;
      unsigned int index;
      u8 b, cfr;

      if (cmd640_vlb && probe_for_cmd640_vlb()) {
            bus_type = "VLB";
      } else {
            cmd640_vlb = 0;
            /* Find out what kind of PCI probing is supported otherwise
               Justin Gibbs will sulk.. */
            if (pci_conf1() && probe_for_cmd640_pci1())
                  bus_type = "PCI (type1)";
            else if (pci_conf2() && probe_for_cmd640_pci2())
                  bus_type = "PCI (type2)";
            else
                  return 0;
      }
      /*
       * Undocumented magic (there is no 0x5b reg in specs)
       */
      put_cmd640_reg(0x5b, 0xbd);
      if (get_cmd640_reg(0x5b) != 0xbd) {
            printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
            return 0;
      }
      put_cmd640_reg(0x5b, 0);

#ifdef CMD640_DUMP_REGS
      cmd640_dump_regs();
#endif

      /*
       * Documented magic begins here
       */
      cfr = get_cmd640_reg(CFR);
      cmd640_chip_version = cfr & CFR_DEVREV;
      if (cmd640_chip_version == 0) {
            printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
            return 0;
      }

      /*
       * Initialize data for primary port
       */
      setup_device_ptrs ();
      printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n",
             cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr);
      cmd_hwif0->chipset = ide_cmd640;
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
      cmd_hwif0->host_flags = IDE_HFLAG_ABUSE_PREFETCH |
                        IDE_HFLAG_ABUSE_FAST_DEVSEL;
      cmd_hwif0->pio_mask = ATA_PIO5;
      cmd_hwif0->set_pio_mode = &cmd640_set_pio_mode;
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

      /*
       * Ensure compatibility by always using the slowest timings
       * for access to the drive's command register block,
       * and reset the prefetch burstsize to default (512 bytes).
       *
       * Maybe we need a way to NOT do these on *some* systems?
       */
      put_cmd640_reg(CMDTIM, 0);
      put_cmd640_reg(BRST, 0x40);

      /*
       * Try to enable the secondary interface, if not already enabled
       */
      if (cmd_hwif1->noprobe) {
            port2 = "not probed";
      } else {
            b = get_cmd640_reg(CNTRL);
            if (secondary_port_responding()) {
                  if ((b & CNTRL_ENA_2ND)) {
                        second_port_cmd640 = 1;
                        port2 = "okay";
                  } else if (cmd640_vlb) {
                        second_port_cmd640 = 1;
                        port2 = "alive";
                  } else
                        port2 = "not cmd640";
            } else {
                  put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
                  if (secondary_port_responding()) {
                        second_port_cmd640 = 1;
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
                        second_port_toggled = 1;
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
                        port2 = "enabled";
                  } else {
                        put_cmd640_reg(CNTRL, b); /* restore original setting */
                        port2 = "not responding";
                  }
            }
      }

      /*
       * Initialize data for secondary cmd640 port, if enabled
       */
      if (second_port_cmd640) {
            cmd_hwif0->serialized = 1;
            cmd_hwif1->serialized = 1;
            cmd_hwif1->chipset = ide_cmd640;
            cmd_hwif0->mate = cmd_hwif1;
            cmd_hwif1->mate = cmd_hwif0;
            cmd_hwif1->channel = 1;
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
            cmd_hwif1->host_flags = IDE_HFLAG_ABUSE_PREFETCH |
                              IDE_HFLAG_ABUSE_FAST_DEVSEL;
            cmd_hwif1->pio_mask = ATA_PIO5;
            cmd_hwif1->set_pio_mode = &cmd640_set_pio_mode;
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
      }
      printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,
            cmd_hwif0->serialized ? "" : "not ", port2);

      /*
       * Establish initial timings/prefetch for all drives.
       * Do not unnecessarily disturb any prior BIOS setup of these.
       */
      for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
            ide_drive_t *drive = cmd_drives[index];
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
            if (drive->autotune || ((index > 1) && second_port_toggled)) {
                  /*
                   * Reset timing to the slowest speed and turn off prefetch.
                   * This way, the drive identify code has a better chance.
                   */
                  setup_counts    [index] = 4;  /* max possible */
                  active_counts   [index] = 16; /* max possible */
                  recovery_counts [index] = 16; /* max possible */
                  program_drive_counts (index);
                  set_prefetch_mode (index, 0);
                  printk("cmd640: drive%d timings/prefetch cleared\n", index);
            } else {
                  /*
                   * Record timings/prefetch without changing them.
                   * This preserves any prior BIOS setup.
                   */
                  retrieve_drive_counts (index);
                  check_prefetch (index);
                  printk("cmd640: drive%d timings/prefetch(%s) preserved",
                        index, drive->no_io_32bit ? "off" : "on");
                  display_clocks(index);
            }
#else
            /*
             * Set the drive unmask flags to match the prefetch setting
             */
            check_prefetch (index);
            printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
                  index, drive->no_io_32bit ? "off" : "on");
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
      }

#ifdef CMD640_DUMP_REGS
      cmd640_dump_regs();
#endif
      return 1;
}


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