aten.c

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/* 
        aten.c  (c) 1997-8  Grant R. Guenther <[email protected]>
                            Under the terms of the GNU General Public License.

    aten.c is a low-level protocol driver for the ATEN EH-100
    parallel port adapter.  The EH-100 supports 4-bit and 8-bit
        modes only.  There is also an EH-132 which supports EPP mode
        transfers.  The EH-132 is not yet supported.

*/

/* Changes:

    1.01    GRG 1998.05.05  init_proto, release_proto

*/

#define ATEN_VERSION      "1.01"

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/types.h>
#include <asm/io.h>

#include "paride.h"

#define j44(a,b)                ((((a>>4)&0x0f)|(b&0xf0))^0x88)

/* cont = 0 - access the IDE register file 
   cont = 1 - access the IDE command set 
*/

static int  cont_map[2] = { 0x08, 0x20 };

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

{   int r;

    r = regr + cont_map[cont] + 0x80;

    w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
}

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

{   int  a, b, r;

        r = regr + cont_map[cont] + 0x40;

    switch (pi->mode) {

        case 0: w0(r); w2(0xe); w2(6); 
        w2(7); w2(6); w2(0);
        a = r1(); w0(0x10); b = r1(); w2(0xc);
        return j44(a,b);

        case 1: r |= 0x10;
        w0(r); w2(0xe); w2(6); w0(0xff); 
        w2(0x27); w2(0x26); w2(0x20);
        a = r0();
        w2(0x26); w2(0xc);
        return a;
    }
    return -1;
}

static void aten_read_block( PIA *pi, char * buf, int count )

{   int  k, a, b, c, d;

    switch (pi->mode) {

    case 0: w0(0x48); w2(0xe); w2(6);
        for (k=0;k<count/2;k++) {
            w2(7); w2(6); w2(2);
            a = r1(); w0(0x58); b = r1();
            w2(0); d = r1(); w0(0x48); c = r1();
            buf[2*k] = j44(c,d);
            buf[2*k+1] = j44(a,b);
        }
        w2(0xc);
        break;

    case 1: w0(0x58); w2(0xe); w2(6);
        for (k=0;k<count/2;k++) {
            w2(0x27); w2(0x26); w2(0x22);
            a = r0(); w2(0x20); b = r0();
            buf[2*k] = b; buf[2*k+1] = a;
        }
        w2(0x26); w2(0xc);
        break;
    }
}

static void aten_write_block( PIA *pi, char * buf, int count )

{   int k;

    w0(0x88); w2(0xe); w2(6);
    for (k=0;k<count/2;k++) {
        w0(buf[2*k+1]); w2(0xe); w2(6);
        w0(buf[2*k]); w2(7); w2(6);
    }
    w2(0xc);
}

static void aten_connect ( PIA *pi  )

{       pi->saved_r0 = r0();
        pi->saved_r2 = r2();
    w2(0xc);    
}

static void aten_disconnect ( PIA *pi )

{       w0(pi->saved_r0);
        w2(pi->saved_r2);
} 

static void aten_log_adapter( PIA *pi, char * scratch, int verbose )

{       char    *mode_string[2] = {"4-bit","8-bit"};

        printk("%s: aten %s, ATEN EH-100 at 0x%x, ",
                pi->device,ATEN_VERSION,pi->port);
        printk("mode %d (%s), delay %d\n",pi->mode,
        mode_string[pi->mode],pi->delay);

}

static struct pi_protocol aten = {
    .owner      = THIS_MODULE,
    .name       = "aten",
    .max_mode   = 2,
    .epp_first  = 2,
    .default_delay  = 1,
    .max_units  = 1,
    .write_regr = aten_write_regr,
    .read_regr  = aten_read_regr,
    .write_block    = aten_write_block,
    .read_block = aten_read_block,
    .connect    = aten_connect,
    .disconnect = aten_disconnect,
    .log_adapter    = aten_log_adapter,
};

static int __init aten_init(void)
{
    return paride_register(&aten);
}

static void __exit aten_exit(void)
{
    paride_unregister( &aten );
}

MODULE_LICENSE("GPL");
module_init(aten_init)
module_exit(aten_exit)