on20.c

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/* 
    on20.c  (c) 1996-8  Grant R. Guenther <[email protected]>
                    Under the terms of the GNU General Public License.

        on20.c is a low-level protocol driver for the
        Onspec 90c20 parallel to IDE adapter. 
*/

/* Changes:

        1.01    GRG 1998.05.06 init_proto, release_proto

*/

#define ON20_VERSION    "1.01"

#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 op(f)   w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
#define vl(v)   w2(4);w0(v);w2(5);w2(7);w2(5);w2(4);

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

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

static int on20_read_regr( PIA *pi, int cont, int regr )

{   int h,l, r ;

        r = (regr<<2) + 1 + cont;

        op(1); vl(r); op(0);

    switch (pi->mode)  {

        case 0:  w2(4); w2(6); l = r1();
                 w2(4); w2(6); h = r1();
                 w2(4); w2(6); w2(4); w2(6); w2(4);
         return j44(l,h);

    case 1:  w2(4); w2(0x26); r = r0(); 
                 w2(4); w2(0x26); w2(4);
         return r;

    }
    return -1;
}   

static void on20_write_regr( PIA *pi, int cont, int regr, int val )

{   int r;

    r = (regr<<2) + 1 + cont;

    op(1); vl(r); 
    op(0); vl(val); 
    op(0); vl(val);
}

static void on20_connect ( PIA *pi)

{   pi->saved_r0 = r0();
        pi->saved_r2 = r2();

    w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4); 
    if (pi->mode) { op(2); vl(8); op(2); vl(9); }
           else   { op(2); vl(0); op(2); vl(8); }
}

static void on20_disconnect ( PIA *pi )

{   w2(4);w0(7);w2(4);w2(0xc);w2(4);
        w0(pi->saved_r0);
        w2(pi->saved_r2);
} 

static void on20_read_block( PIA *pi, char * buf, int count )

{   int     k, l, h; 

    op(1); vl(1); op(0);

    for (k=0;k<count;k++) 
        if (pi->mode) {
        w2(4); w2(0x26); buf[k] = r0();
        } else {
        w2(6); l = r1(); w2(4);
        w2(6); h = r1(); w2(4);
        buf[k] = j44(l,h);
        }
    w2(4);
}

static void on20_write_block(  PIA *pi, char * buf, int count )

{   int k;

    op(1); vl(1); op(0);

    for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); }
    w2(4);
}

static void on20_log_adapter( PIA *pi, char * scratch, int verbose )

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

        printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ",
                pi->device,ON20_VERSION,pi->port);
        printk("mode %d (%s), delay %d\n",pi->mode,
        mode_string[pi->mode],pi->delay);

}

static struct pi_protocol on20 = {
    .owner      = THIS_MODULE,
    .name       = "on20",
    .max_mode   = 2,
    .epp_first  = 2,
    .default_delay  = 1,
    .max_units  = 1,
    .write_regr = on20_write_regr,
    .read_regr  = on20_read_regr,
    .write_block    = on20_write_block,
    .read_block = on20_read_block,
    .connect    = on20_connect,
    .disconnect = on20_disconnect,
    .log_adapter    = on20_log_adapter,
};

static int __init on20_init(void)
{
    return paride_register(&on20);
}

static void __exit on20_exit(void)
{
    paride_unregister(&on20);
}

MODULE_LICENSE("GPL");
module_init(on20_init)
module_exit(on20_exit)