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/*

 *  linux/drivers/block/cmd640.c        Version 1.02  Sep 01, 1996

 *

 *  Copyright (C) 1995-1996  Linus Torvalds & authors (see below)

 */

/*

 *  Original author:    abramov@cecmow.enet.dec.com (Igor Abramov)

 *

 *  Maintained by:      mlord@pobox.com (Mark Lord)

 *                      with fanatical support from a legion of hackers!

 *

 *  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 wierd 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)

 */

#undef REALLY_SLOW_IO           /* most systems can safely undef this */

#define CMD640_PREFETCH_MASKS 1

#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 <asm/io.h>

#include "ide.h"

#include "ide_modes.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 byte prefetch_regs[4]  = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};

static byte prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};

#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED

static byte arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};

static byte drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};

/*

 * Current cmd640 timing values for each drive.

 * The defaults for each are the slowest possible timings.

 */

static byte setup_counts[4]    = {4, 4, 4, 4};     /* Address setup count (in clocks) */

static byte active_counts[4]   = {16, 16, 16, 16}; /* Active count   (encoded) */

static byte recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */

#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

/*

 * 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)(unsigned short reg, byte val);

static byte (*get_cmd640_reg)(unsigned short 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 (unsigned short reg, byte val)

{

        unsigned long flags;

        save_flags(flags);

        cli();

        outl_p((reg & 0xfc) | cmd640_key, 0xcf8);

        outb_p(val, (reg & 3) | 0xcfc);

        restore_flags(flags);

}

static byte get_cmd640_reg_pci1 (unsigned short reg)

{

        byte b;

        unsigned long flags;

        save_flags(flags);

        cli();

        outl_p((reg & 0xfc) | cmd640_key, 0xcf8);

        b = inb_p((reg & 3) | 0xcfc);

        restore_flags(flags);

        return b;

}

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

static void put_cmd640_reg_pci2 (unsigned short reg, byte val)

{

        unsigned long flags;

        save_flags(flags);

        cli();

        outb_p(0x10, 0xcf8);

        outb_p(val, cmd640_key + reg);

        outb_p(0, 0xcf8);

        restore_flags(flags);

}

static byte get_cmd640_reg_pci2 (unsigned short reg)

{

        byte b;

        unsigned long flags;

        save_flags(flags);

        cli();

        outb_p(0x10, 0xcf8);

        b = inb_p(cmd640_key + reg);

        outb_p(0, 0xcf8);

        restore_flags(flags);

        return b;

}

/* VLB access */

static void put_cmd640_reg_vlb (unsigned short reg, byte val)

{

        unsigned long flags;

        save_flags(flags);

        cli();

        outb_p(reg, cmd640_key);

        outb_p(val, cmd640_key + 4);

        restore_flags(flags);

}

static byte get_cmd640_reg_vlb (unsigned short reg)

{

        byte b;

        unsigned long flags;

        save_flags(flags);

        cli();

        outb_p(reg, cmd640_key);

        b = inb_p(cmd640_key + 4);

        restore_flags(flags);

        return b;

}

static int match_pci_cmd640_device (void)

{

        const byte 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 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 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 probe_for_cmd640_vlb (void)

{

        byte 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 secondary_port_responding (void)

{

        unsigned long flags;

        save_flags(flags);

        cli();

        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) {

                        restore_flags(flags);

                        return 0; /* nothing responded */

                }

        }

        restore_flags(flags);

        return 1; /* success */

}

#ifdef CMD640_DUMP_REGS

/*

 * Dump out all cmd640 registers.  May be called from ide.c

 */

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 check_prefetch (unsigned int index)

{

        ide_drive_t *drive = cmd_drives[index];

        byte 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 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_generic) {

                        if (hwif->io_base == 0x1f0)

                                cmd_hwif0 = hwif;

                        else if (hwif->io_base == 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];

        int reg = prefetch_regs[index];

        byte b;

        unsigned long flags;

        save_flags(flags);

        cli();

        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);

        restore_flags(flags);

}

/*

 * Dump out current drive clocks settings

 */

static void display_clocks (unsigned int index)

{

        byte 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

 */

inline static byte pack_nibbles (byte upper, byte lower)

{

        return ((upper & 0x0f) << 4) | (lower & 0x0f);

}

/*

 * This routine retrieves the initial drive timings from the chipset.

 */

static void retrieve_drive_counts (unsigned int index)

{

        byte 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;

        byte setup_count    = setup_counts[index];

        byte active_count   = active_counts[index];

        byte 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

         */

        save_flags (flags);

        cli();

        /*

         * 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));

        restore_flags(flags);

}

/*

 * Set a specific pio_mode for a drive

 */

static void cmd640_set_mode (unsigned int index, byte pio_mode, unsigned int cycle_time)

{

        int setup_time, active_time, recovery_time, clock_time;

        byte setup_count, active_count, recovery_count, recovery_count2, cycle_count;

        int bus_speed = ide_system_bus_speed();

        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);

}

/*

 * Drive PIO mode selection:

 */

static void cmd640_tune_drive (ide_drive_t *drive, byte mode_wanted)

{

        byte b;

        ide_pio_data_t  d;

        unsigned int index = 0;

        while (drive != cmd_drives[index]) {

                if (++index > 3) {

                        printk("%s: bad news in cmd640_tune_drive\n", drive->name);

                        return;

                }

        }

        switch (mode_wanted) {

                case 6: /* set fast-devsel off */

                case 7: /* set fast-devsel on */

                        mode_wanted &= 1;

                        b = get_cmd640_reg(CNTRL) & ~0x27;

                        if (mode_wanted)

                                b |= 0x27;

                        put_cmd640_reg(CNTRL, b);

                        printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis");

                        return;

                case 8: /* set prefetch off */

                case 9: /* set prefetch on */

                        mode_wanted &= 1;

                        set_prefetch_mode(index, mode_wanted);

                        printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis");

                        return;

        }

        (void) ide_get_best_pio_mode (drive, mode_wanted, 5, &d);

        cmd640_set_mode (index, d.pio_mode, d.cycle_time);

        printk ("%s: selected cmd640 PIO mode%d (%dns) %s/IORDY%s",

                drive->name,

                d.pio_mode,

                d.cycle_time,

                d.use_iordy ? "w" : "wo",

                d.overridden ? " (overriding vendor mode)" : "");

        display_clocks(index);

}

#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

/*

 * Probe for a cmd640 chipset, and initialize it if found.  Called from ide.c

 */

int ide_probe_for_cmd640x (void)

{