linux-imx

/* 

        epat.c  (c) 1997-8  Grant R. Guenther <grant@torque.net>

                            Under the terms of the GNU General Public License.

​

    This is the low level protocol driver for the EPAT parallel

        to IDE adapter from Shuttle Technologies.  This adapter is

        used in many popular parallel port disk products such as the

        SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.

*/

​

/* Changes:

​

        1.01    GRG 1998.05.06 init_proto, release_proto

        1.02    Joshua b. Jore CPP(renamed), epat_connect, epat_disconnect

​

*/

​

#define EPAT_VERSION      "1.02"

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/wait.h>

#include <asm/io.h>

​

#include "paride.h"

​

#define j44(a,b)        (((a>>4)&0x0f)+(b&0xf0))

#define j53(a,b)        (((a>>3)&0x1f)+((b<<4)&0xe0))

​

static int epatc8;

​

module_param(epatc8, int, 0);

MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, "

    "used in any recent Imation SuperDisk (LS-120) drive.");

​

/* cont =  0   IDE register file

   cont =  1   IDE control registers

   cont =  2   internal EPAT registers

*/

​

static int cont_map[3] = { 0x18, 0x10, 0 };

​

static void epat_write_regr( PIA *pi, int cont, int regr, int val)

​

{   int r;

​

    r = regr + cont_map[cont];

​

    switch (pi->mode) {

​

    case 0:

    case 1:

    case 2: w0(0x60+r); w2(1); w0(val); w2(4);

        break;

​

    case 3:

    case 4:

    case 5: w3(0x40+r); w4(val);

        break;

​

    }

}

​

static int epat_read_regr( PIA *pi, int cont, int regr )

​

{   int  a, b, r;

​

    r = regr + cont_map[cont];

​

    switch (pi->mode) {

​

    case 0: w0(r); w2(1); w2(3); 

        a = r1(); w2(4); b = r1();

        return j44(a,b);

​

    case 1: w0(0x40+r); w2(1); w2(4);

        a = r1(); b = r2(); w0(0xff);

        return j53(a,b);

​

    case 2: w0(0x20+r); w2(1); w2(0x25);

        a = r0(); w2(4);

        return a;

​

    case 3:

    case 4:

    case 5: w3(r); w2(0x24); a = r4(); w2(4);

        return a;

​