drivers/block/paride/dstr.c

   1 /*
   2         dstr.c    (c) 1997-8  Grant R. Guenther <grant@torque.net>
   3                               Under the terms of the GNU General Public License.
   4
   5         dstr.c is a low-level protocol driver for the
   6         DataStor EP2000 parallel to IDE adapter chip.
   7
   8 */
   9
  10 /* Changes:
  11
  12         1.01    GRG 1998.05.06 init_proto, release_proto
  13
  14 */
  15
  16 #define DSTR_VERSION      "1.01"
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/wait.h>
  24 #include <asm/io.h>
  25
  26 #include "paride.h"
  27
  28 /* mode codes:  0  nybble reads, 8-bit writes
  29                 1  8-bit reads and writes
  30                 2  8-bit EPP mode
  31                 3  EPP-16
  32                 4  EPP-32
  33 */
  34
  35 #define j44(a,b)  (((a>>3)&0x07)|((~a>>4)&0x08)|((b<<1)&0x70)|((~b)&0x80))
  36
  37 #define P1      w2(5);w2(0xd);w2(5);w2(4);
  38 #define P2      w2(5);w2(7);w2(5);w2(4);
  39 #define P3      w2(6);w2(4);w2(6);w2(4);
  40
  41 /* cont = 0 - access the IDE register file
  42    cont = 1 - access the IDE command set
  43 */
  44
  45 static int  cont_map[2] = { 0x20, 0x40 };
  46
  47 static int dstr_read_regr( PIA *pi, int cont, int regr )
  48
  49 {       int     a, b, r;
  50
  51         r = regr + cont_map[cont];
  52
  53         w0(0x81); P1;
  54         if (pi->mode) { w0(0x11); } else { w0(1); }
  55         P2; w0(r); P1;
  56
  57         switch (pi->mode)  {
  58
  59         case 0: w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);
  60                 return j44(a,b);
  61
  62         case 1: w0(0); w2(0x26); a = r0(); w2(4);
  63                 return a;
  64
  65         case 2:
  66         case 3:
  67         case 4: w2(0x24); a = r4(); w2(4);
  68                 return a;
  69
  70         }
  71         return -1;
  72 }
  73
  74 static void dstr_write_regr(  PIA *pi, int cont, int regr, int val )
  75
  76 {       int  r;
  77
  78         r = regr + cont_map[cont];
  79
  80         w0(0x81); P1;
  81         if (pi->mode >= 2) { w0(0x11); } else { w0(1); }
  82         P2; w0(r); P1;
  83
  84         switch (pi->mode)  {
  85
  86         case 0:
  87         case 1: w0(val); w2(5); w2(7); w2(5); w2(4);
  88                 break;
  89
  90         case 2:
  91         case 3:
  92         case 4: w4(val);
  93                 break;
  94         }
  95 }
  96
  97 #define  CCP(x)  w0(0xff);w2(0xc);w2(4);\
  98                  w0(0xaa);w0(0x55);w0(0);w0(0xff);w0(0x87);w0(0x78);\
  99                  w0(x);w2(5);w2(4);
 100
 101 static void dstr_connect ( PIA *pi  )
 102
 103 {       pi->saved_r0 = r0();
 104         pi->saved_r2 = r2();
 105         w2(4); CCP(0xe0); w0(0xff);
 106 }
 107
 108 static void dstr_disconnect ( PIA *pi )
 109
 110 {       CCP(0x30);
 111         w0(pi->saved_r0);
 112         w2(pi->saved_r2);
 113 }
 114
 115 static void dstr_read_block( PIA *pi, char * buf, int count )
 116
 117 {       int     k, a, b;
 118
 119         w0(0x81); P1;
 120         if (pi->mode) { w0(0x19); } else { w0(9); }
 121         P2; w0(0x82); P1; P3; w0(0x20); P1;
 122
 123         switch (pi->mode) {
 124
 125         case 0: for (k=0;k<count;k++) {
 126                         w2(6); a = r1(); w2(4);
 127                         w2(6); b = r1(); w2(4);
 128                         buf[k] = j44(a,b);
 129                 }
 130                 break;
 131
 132         case 1: w0(0);
 133                 for (k=0;k<count;k++) {
 134                         w2(0x26); buf[k] = r0(); w2(0x24);
 135                 }
 136                 w2(4);
 137                 break;
 138
 139         case 2: w2(0x24);
 140                 for (k=0;k<count;k++) buf[k] = r4();
 141                 w2(4);
 142                 break;
 143
 144         case 3: w2(0x24);
 145                 for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
 146                 w2(4);
 147                 break;
 148
 149         case 4: w2(0x24);
 150                 for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
 151                 w2(4);
 152                 break;
 153
 154         }
 155 }
 156
 157 static void dstr_write_block( PIA *pi, char * buf, int count )
 158
 159 {       int     k;
 160
 161         w0(0x81); P1;
 162         if (pi->mode) { w0(0x19); } else { w0(9); }
 163         P2; w0(0x82); P1; P3; w0(0x20); P1;
 164
 165         switch (pi->mode) {
 166
 167         case 0:
 168         case 1: for (k=0;k<count;k++) {
 169                         w2(5); w0(buf[k]); w2(7);
 170                 }
 171                 w2(5); w2(4);
 172                 break;
 173
 174         case 2: w2(0xc5);
 175                 for (k=0;k<count;k++) w4(buf[k]);
 176                 w2(0xc4);
 177                 break;
 178
 179         case 3: w2(0xc5);
 180                 for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
 181                 w2(0xc4);
 182                 break;
 183
 184         case 4: w2(0xc5);
 185                 for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
 186                 w2(0xc4);
 187                 break;
 188
 189         }
 190 }
 191
 192
 193 static void dstr_log_adapter( PIA *pi, char * scratch, int verbose )
 194
 195 {       char    *mode_string[5] = {"4-bit","8-bit","EPP-8",
 196                                    "EPP-16","EPP-32"};
 197
 198         printk("%s: dstr %s, DataStor EP2000 at 0x%x, ",
 199                 pi->device,DSTR_VERSION,pi->port);
 200         printk("mode %d (%s), delay %d\n",pi->mode,
 201                 mode_string[pi->mode],pi->delay);
 202
 203 }
 204
 205 static struct pi_protocol dstr = {
 206         .owner          = THIS_MODULE,
 207         .name           = "dstr",
 208         .max_mode       = 5,
 209         .epp_first      = 2,
 210         .default_delay  = 1,
 211         .max_units      = 1,
 212         .write_regr     = dstr_write_regr,
 213         .read_regr      = dstr_read_regr,
 214         .write_block    = dstr_write_block,
 215         .read_block     = dstr_read_block,
 216         .connect        = dstr_connect,
 217         .disconnect     = dstr_disconnect,
 218         .log_adapter    = dstr_log_adapter,
 219 };
 220
 221 static int __init dstr_init(void)
 222 {
 223         return pi_register(&dstr)-1;
 224 }
 225
 226 static void __exit dstr_exit(void)
 227 {
 228         pi_unregister(&dstr);
 229 }
 230
 231 MODULE_LICENSE("GPL");
 232 module_init(dstr_init)
 233 module_exit(dstr_exit)