fit2.c

Go to the documentation of this file.

/* 
        fit2.c        (c) 1998  Grant R. Guenther <[email protected]>
                          Under the terms of the GNU General Public License.

    fit2.c is a low-level protocol driver for the older version
        of the Fidelity International Technology parallel port adapter.  
    This adapter is used in their TransDisk 2000 and older TransDisk
    3000 portable hard-drives.  As far as I can tell, this device
    supports 4-bit mode _only_.  

    Newer models of the FIT products use an enhanced protocol.
    The "fit3" protocol module should support current drives.

*/

#define FIT2_VERSION      "1.0"

#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))

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

NB:  The FIT adapter does not appear to use the control registers.
So, we map ALT_STATUS to STATUS and NO-OP writes to the device
control register - this means that IDE reset will not work on these
devices.

*/

static void  fit2_write_regr( PIA *pi, int cont, int regr, int val)

{   if (cont == 1) return;
    w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);
}

static int fit2_read_regr( PIA *pi, int cont, int regr )

{   int  a, b, r;

    if (cont) {
      if (regr != 6) return 0xff;
      r = 7;
    } else r = regr + 0x10;

    w2(0xc); w0(r); w2(4); w2(5); 
             w0(0); a = r1();
             w0(1); b = r1();
    w2(4);

    return j44(a,b);

}

static void fit2_read_block( PIA *pi, char * buf, int count )

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

    w2(0xc); w0(0x10);

    for (k=0;k<count/4;k++) {

        w2(4); w2(5);
        w0(0); a = r1(); w0(1); b = r1();
        w0(3); c = r1(); w0(2); d = r1(); 
        buf[4*k+0] = j44(a,b);
        buf[4*k+1] = j44(d,c);

                w2(4); w2(5);
                       a = r1(); w0(3); b = r1();
                w0(1); c = r1(); w0(0); d = r1(); 
                buf[4*k+2] = j44(d,c);
                buf[4*k+3] = j44(a,b);

    }

    w2(4);

}

static void fit2_write_block( PIA *pi, char * buf, int count )

{   int k;


    w2(0xc); w0(0); 
    for (k=0;k<count/2;k++) {
        w2(4); w0(buf[2*k]); 
        w2(5); w0(buf[2*k+1]);
    }
    w2(4);
}

static void fit2_connect ( PIA *pi  )

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

static void fit2_disconnect ( PIA *pi )

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

static void fit2_log_adapter( PIA *pi, char * scratch, int verbose )

{       printk("%s: fit2 %s, FIT 2000 adapter at 0x%x, delay %d\n",
                pi->device,FIT2_VERSION,pi->port,pi->delay);

}

static struct pi_protocol fit2 = {
    .owner      = THIS_MODULE,
    .name       = "fit2",
    .max_mode   = 1,
    .epp_first  = 2,
    .default_delay  = 1,
    .max_units  = 1,
    .write_regr = fit2_write_regr,
    .read_regr  = fit2_read_regr,
    .write_block    = fit2_write_block,
    .read_block = fit2_read_block,
    .connect    = fit2_connect,
    .disconnect = fit2_disconnect,
    .log_adapter    = fit2_log_adapter,
};

static int __init fit2_init(void)
{
    return paride_register(&fit2);
}

static void __exit fit2_exit(void)
{
    paride_unregister(&fit2);
}

MODULE_LICENSE("GPL");
module_init(fit2_init)
module_exit(fit2_exit)