drivers/block/paride/fit3.c

   1 /*
   2         fit3.c        (c) 1998  Grant R. Guenther <grant@torque.net>
   3                           Under the terms of the GNU General Public License.
   4
   5         fit3.c is a low-level protocol driver for newer models
   6         of the Fidelity International Technology parallel port adapter.
   7         This adapter is used in their TransDisk 3000 portable
   8         hard-drives, as well as CD-ROM, PD-CD and other devices.
   9
  10         The TD-2000 and certain older devices use a different protocol.
  11         Try the fit2 protocol module with them.
  12
  13         NB:  The FIT adapters do not appear to support the control
  14         registers.  So, we map ALT_STATUS to STATUS and NO-OP writes
  15         to the device control register - this means that IDE reset
  16         will not work on these devices.
  17
  18 */
  19
  20 #define FIT3_VERSION      "1.0"
  21
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/delay.h>
  25 #include <linux/kernel.h>
  26 #include <linux/types.h>
  27 #include <linux/wait.h>
  28 #include <asm/io.h>
  29
  30 #include "paride.h"
  31
  32 #define j44(a,b)                (((a>>3)&0x0f)|((b<<1)&0xf0))
  33
  34 #define w7(byte)                {out_p(7,byte);}
  35 #define r7()                    (in_p(7) & 0xff)
  36
  37 /* cont = 0 - access the IDE register file
  38    cont = 1 - access the IDE command set
  39
  40 */
  41
  42 static void  fit3_write_regr( PIA *pi, int cont, int regr, int val)
  43
  44 {       if (cont == 1) return;
  45
  46         switch (pi->mode) {
  47
  48         case 0:
  49         case 1: w2(0xc); w0(regr); w2(0x8); w2(0xc);
  50                 w0(val); w2(0xd);
  51                 w0(0);   w2(0xc);
  52                 break;
  53
  54         case 2: w2(0xc); w0(regr); w2(0x8); w2(0xc);
  55                 w4(val); w4(0);
  56                 w2(0xc);
  57                 break;
  58
  59         }
  60 }
  61
  62 static int fit3_read_regr( PIA *pi, int cont, int regr )
  63
  64 {       int  a, b;
  65
  66         if (cont) {
  67           if (regr != 6) return 0xff;
  68           regr = 7;
  69         }
  70
  71         switch (pi->mode) {
  72
  73         case 0: w2(0xc); w0(regr + 0x10); w2(0x8); w2(0xc);
  74                 w2(0xd); a = r1();
  75                 w2(0xf); b = r1();
  76                 w2(0xc);
  77                 return j44(a,b);
  78
  79         case 1: w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
  80                 w2(0xec); w2(0xee); w2(0xef); a = r0();
  81                 w2(0xc);
  82                 return a;
  83
  84         case 2: w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
  85                 w2(0xec);
  86                 a = r4(); b = r4();
  87                 w2(0xc);
  88                 return a;
  89
  90         }
  91         return -1;
  92
  93 }
  94
  95 static void fit3_read_block( PIA *pi, char * buf, int count )
  96
  97 {       int  k, a, b, c, d;
  98
  99         switch (pi->mode) {
 100
 101         case 0: w2(0xc); w0(0x10); w2(0x8); w2(0xc);
 102                 for (k=0;k<count/2;k++) {
 103                     w2(0xd); a = r1();
 104                     w2(0xf); b = r1();
 105                     w2(0xc); c = r1();
 106                     w2(0xe); d = r1();
 107                     buf[2*k  ] = j44(a,b);
 108                     buf[2*k+1] = j44(c,d);
 109                 }
 110                 w2(0xc);
 111                 break;
 112
 113         case 1: w2(0xc); w0(0x90); w2(0x8); w2(0xc);
 114                 w2(0xec); w2(0xee);
 115                 for (k=0;k<count/2;k++) {
 116                     w2(0xef); a = r0();
 117                     w2(0xee); b = r0();
 118                     buf[2*k  ] = a;
 119                     buf[2*k+1] = b;
 120                 }
 121                 w2(0xec);
 122                 w2(0xc);
 123                 break;
 124
 125         case 2: w2(0xc); w0(0x90); w2(0x8); w2(0xc);
 126                 w2(0xec);
 127                 for (k=0;k<count;k++) buf[k] = r4();
 128                 w2(0xc);
 129                 break;
 130
 131         }
 132 }
 133
 134 static void fit3_write_block( PIA *pi, char * buf, int count )
 135
 136 {       int k;
 137
 138         switch (pi->mode) {
 139
 140         case 0:
 141         case 1: w2(0xc); w0(0); w2(0x8); w2(0xc);
 142                 for (k=0;k<count/2;k++) {
 143                     w0(buf[2*k  ]); w2(0xd);
 144                     w0(buf[2*k+1]); w2(0xc);
 145                 }
 146                 break;
 147
 148         case 2: w2(0xc); w0(0); w2(0x8); w2(0xc);
 149                 for (k=0;k<count;k++) w4(buf[k]);
 150                 w2(0xc);
 151                 break;
 152         }
 153 }
 154
 155 static void fit3_connect ( PIA *pi  )
 156
 157 {       pi->saved_r0 = r0();
 158         pi->saved_r2 = r2();
 159         w2(0xc); w0(0); w2(0xa);
 160         if (pi->mode == 2) {
 161                 w2(0xc); w0(0x9); w2(0x8); w2(0xc);
 162                 }
 163 }
 164
 165 static void fit3_disconnect ( PIA *pi )
 166
 167 {       w2(0xc); w0(0xa); w2(0x8); w2(0xc);
 168         w0(pi->saved_r0);
 169         w2(pi->saved_r2);
 170 }
 171
 172 static void fit3_log_adapter( PIA *pi, char * scratch, int verbose )
 173
 174 {       char    *mode_string[3] = {"4-bit","8-bit","EPP"};
 175
 176         printk("%s: fit3 %s, FIT 3000 adapter at 0x%x, "
 177                "mode %d (%s), delay %d\n",
 178                 pi->device,FIT3_VERSION,pi->port,
 179                 pi->mode,mode_string[pi->mode],pi->delay);
 180
 181 }
 182
 183 static struct pi_protocol fit3 = {
 184         .owner          = THIS_MODULE,
 185         .name           = "fit3",
 186         .max_mode       = 3,
 187         .epp_first      = 2,
 188         .default_delay  = 1,
 189         .max_units      = 1,
 190         .write_regr     = fit3_write_regr,
 191         .read_regr      = fit3_read_regr,
 192         .write_block    = fit3_write_block,
 193         .read_block     = fit3_read_block,
 194         .connect        = fit3_connect,
 195         .disconnect     = fit3_disconnect,
 196         .log_adapter    = fit3_log_adapter,
 197 };
 198
 199 static int __init fit3_init(void)
 200 {
 201         return pi_register(&fit3)-1;
 202 }
 203
 204 static void __exit fit3_exit(void)
 205 {
 206         pi_unregister(&fit3);
 207 }
 208
 209 MODULE_LICENSE("GPL");
 210 module_init(fit3_init)
 211 module_exit(fit3_exit)