Logo Search packages:      
Sourcecode: linux version File versions  Download package

aten.c

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

Generated by  Doxygen 1.6.0   Back to index