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/*

 *  linux/drivers/block/ali14xx.c       Version 0.03  Feb 09, 1996

 *

 *  Copyright (C) 1996  Linus Torvalds & author (see below)

 */

/*

 * ALI M14xx chipset EIDE controller

 *

 * Works for ALI M1439/1443/1445/1487/1489 chipsets.

 *

 * Adapted from code developed by derekn@vw.ece.cmu.edu.  -ml

 * Derek's notes follow:

 *

 * I think the code should be pretty understandable,

 * but I'll be happy to (try to) answer questions.

 *

 * The critical part is in the setupDrive function.  The initRegisters

 * function doesn't seem to be necessary, but the DOS driver does it, so

 * I threw it in.

 *

 * I've only tested this on my system, which only has one disk.  I posted

 * it to comp.sys.linux.hardware, so maybe some other people will try it

 * out.

 *

 * Derek Noonburg  (derekn@ece.cmu.edu)

 * 95-sep-26

 *

 * Update 96-jul-13:

 *

 * I've since upgraded to two disks and a CD-ROM, with no trouble, and

 * I've also heard from several others who have used it successfully.

 * This driver appears to work with both the 1443/1445 and the 1487/1489

 * chipsets.  I've added support for PIO mode 4 for the 1487.  This

 * seems to work just fine on the 1443 also, although I'm not sure it's

 * advertised as supporting mode 4.  (I've been running a WDC AC21200 in

 * mode 4 for a while now with no trouble.)  -Derek

 */

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

#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"

/* port addresses for auto-detection */

#define ALI_NUM_PORTS 4

static int ports[ALI_NUM_PORTS] = {0x074, 0x0f4, 0x034, 0x0e4};

/* register initialization data */

typedef struct { byte reg, data; } RegInitializer;

static RegInitializer initData[] = {

        {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},

        {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},

        {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},

        {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},

        {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},

        {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},

        {0x35, 0x03}, {0x00, 0x00}

};

#define ALI_MAX_PIO 4

/* timing parameter registers for each drive */

static struct { byte reg1, reg2, reg3, reg4; } regTab[4] = {

        {0x03, 0x26, 0x04, 0x27},     /* drive 0 */

        {0x05, 0x28, 0x06, 0x29},     /* drive 1 */

        {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */

        {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */

};

static int basePort = 0; /* base port address */

static int regPort = 0;          /* port for register number */

static int dataPort = 0; /* port for register data */

static byte regOn;      /* output to base port to access registers */

static byte regOff;     /* output to base port to close registers */

/*------------------------------------------------------------------------*/

/*

 * Read a controller register.

 */

static inline byte inReg (byte reg)

{

        outb_p(reg, regPort);

        return inb(dataPort);

}

/*

 * Write a controller register.

 */

static void outReg (byte data, byte reg)

{

        outb_p(reg, regPort);

        outb_p(data, dataPort);

}

/*

 * Set PIO mode for the specified drive.

 * This function computes timing parameters

 * and sets controller registers accordingly.

 */

static void ali14xx_tune_drive (ide_drive_t *drive, byte pio)

{

        int driveNum;

        int time1, time2;

        byte param1, param2, param3, param4;

        unsigned long flags;

        ide_pio_data_t d;

        int bus_speed = ide_system_bus_speed();

        pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);

        /* calculate timing, according to PIO mode */

        time1 = d.cycle_time;

        time2 = ide_pio_timings[pio].active_time;

        param3 = param1 = (time2 * bus_speed + 999) / 1000;

        param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;

        if (pio < 3) {

                param3 += 8;

                param4 += 8;

        }

        printk("%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",

                drive->name, pio, time1, time2, param1, param2, param3, param4);

        /* stuff timing parameters into controller registers */

        driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;

        save_flags(flags);

        cli();

        outb_p(regOn, basePort);

        outReg(param1, regTab[driveNum].reg1);

        outReg(param2, regTab[driveNum].reg2);

        outReg(param3, regTab[driveNum].reg3);

        outReg(param4, regTab[driveNum].reg4);

        outb_p(regOff, basePort);

        restore_flags(flags);

}

/*

 * Auto-detect the IDE controller port.

 */

static int findPort (void)

{

        int i;

        byte t;

        unsigned long flags;

        save_flags(flags);

        cli();

        for (i = 0; i < ALI_NUM_PORTS; ++i) {

                basePort = ports[i];

                regOff = inb(basePort);

                for (regOn = 0x30; regOn <= 0x33; ++regOn) {

                        outb_p(regOn, basePort);

                        if (inb(basePort) == regOn) {

                                regPort = basePort + 4;

                                dataPort = basePort + 8;

                                t = inReg(0) & 0xf0;

                                outb_p(regOff, basePort);

                                restore_flags(flags);

                                if (t != 0x50)

                                        return 0;

                                return 1;  /* success */

                        }

                }

                outb_p(regOff, basePort);

        }

        restore_flags(flags);

        return 0;

}

/*

 * Initialize controller registers with default values.

 */

static int initRegisters (void) {

        RegInitializer *p;

        byte t;

        unsigned long flags;

        save_flags(flags);

        cli();

        outb_p(regOn, basePort);

        for (p = initData; p->reg != 0; ++p)

                outReg(p->data, p->reg);

        outb_p(0x01, regPort);

        t = inb(regPort) & 0x01;

        outb_p(regOff, basePort);

        restore_flags(flags);

        return t;

}

void init_ali14xx (void)

{

        /* auto-detect IDE controller port */

        if (!findPort()) {

                printk("ali14xx: not found\n");

                return;

        }

        printk("ali14xx: base= 0x%03x, regOn = 0x%02x\n", basePort, regOn);

        ide_hwifs[0].chipset = ide_ali14xx;

        ide_hwifs[1].chipset = ide_ali14xx;

        ide_hwifs[0].tuneproc = &ali14xx_tune_drive;

        ide_hwifs[1].tuneproc = &ali14xx_tune_drive;

        /* initialize controller registers */

        if (!initRegisters()) {

                printk("ali14xx: Chip initialization failed\n");

                return;

        }

}