LXR linux/drivers/block/paride/ktti.c

   1/* 
   2        ktti.c        (c) 1998  Grant R. Guenther <grant@torque.net>
   3                          Under the terms of the GNU General Public License.
   4
   5        ktti.c is a low-level protocol driver for the KT Technology
   6        parallel port adapter.  This adapter is used in the "PHd" 
   7        portable hard-drives.  As far as I can tell, this device
   8        supports 4-bit mode _only_.  
   9
  10*/
  11
  12#define KTTI_VERSION      "1.0"
  13
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/delay.h>
  17#include <linux/kernel.h>
  18#include <linux/types.h>
  19#include <linux/wait.h>
  20#include <asm/io.h>
  21
  22#include "paride.h"
  23
  24#define j44(a,b)                (((a>>4)&0x0f)|(b&0xf0))
  25
  26/* cont = 0 - access the IDE register file 
  27   cont = 1 - access the IDE command set 
  28*/
  29
  30static int  cont_map[2] = { 0x10, 0x08 };
  31
  32static void  ktti_write_regr( PIA *pi, int cont, int regr, int val)
  33
  34{       int r;
  35
  36        r = regr + cont_map[cont];
  37
  38        w0(r); w2(0xb); w2(0xa); w2(3); w2(6); 
  39        w0(val); w2(3); w0(0); w2(6); w2(0xb);
  40}
  41
  42static int ktti_read_regr( PIA *pi, int cont, int regr )
  43
  44{       int  a, b, r;
  45
  46        r = regr + cont_map[cont];
  47
  48        w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9); 
  49        a = r1(); w2(0xc);  b = r1(); w2(9); w2(0xc); w2(9);
  50        return j44(a,b);
  51
  52}
  53
  54static void ktti_read_block( PIA *pi, char * buf, int count )
  55
  56{       int  k, a, b;
  57
  58        for (k=0;k<count/2;k++) {
  59                w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
  60                a = r1(); w2(0xc); b = r1(); w2(9);
  61                buf[2*k] = j44(a,b);
  62                a = r1(); w2(0xc); b = r1(); w2(9);
  63                buf[2*k+1] = j44(a,b);
  64        }
  65}
  66
  67static void ktti_write_block( PIA *pi, char * buf, int count )
  68
  69{       int k;
  70
  71        for (k=0;k<count/2;k++) {
  72                w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
  73                w0(buf[2*k]); w2(3);
  74                w0(buf[2*k+1]); w2(6);
  75                w2(0xb);
  76        }
  77}
  78
  79static void ktti_connect ( PIA *pi  )
  80
  81{       pi->saved_r0 = r0();
  82        pi->saved_r2 = r2();
  83        w2(0xb); w2(0xa); w0(0); w2(3); w2(6);  
  84}
  85
  86static void ktti_disconnect ( PIA *pi )
  87
  88{       w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
  89        w0(pi->saved_r0);
  90        w2(pi->saved_r2);
  91} 
  92
  93static void ktti_log_adapter( PIA *pi, char * scratch, int verbose )
  94
  95{       printk("%s: ktti %s, KT adapter at 0x%x, delay %d\n",
  96                pi->device,KTTI_VERSION,pi->port,pi->delay);
  97
  98}
  99
 100static struct pi_protocol ktti = {
 101        .owner          = THIS_MODULE,
 102        .name           = "ktti",
 103        .max_mode       = 1,
 104        .epp_first      = 2,
 105        .default_delay  = 1,
 106        .max_units      = 1,
 107        .write_regr     = ktti_write_regr,
 108        .read_regr      = ktti_read_regr,
 109        .write_block    = ktti_write_block,
 110        .read_block     = ktti_read_block,
 111        .connect        = ktti_connect,
 112        .disconnect     = ktti_disconnect,
 113        .log_adapter    = ktti_log_adapter,
 114};
 115
 116static int __init ktti_init(void)
 117{
 118        return paride_register(&ktti);
 119}
 120
 121static void __exit ktti_exit(void)
 122{
 123        paride_unregister(&ktti);
 124}
 125
 126MODULE_LICENSE("GPL");
 127module_init(ktti_init)
 128module_exit(ktti_exit)
 129