drivers/block/paride/epia.c

   1 /*
   2         epia.c    (c) 1997-8  Grant R. Guenther <grant@torque.net>
   3                               Under the terms of the GNU General Public License.
   4
   5         epia.c is a low-level protocol driver for Shuttle Technologies
   6         EPIA parallel to IDE adapter chip.  This device is now obsolete
   7         and has been replaced with the EPAT chip, which is supported
   8         by epat.c, however, some devices based on EPIA are still
   9         available.
  10
  11 */
  12
  13 /* Changes:
  14
  15         1.01    GRG 1998.05.06 init_proto, release_proto
  16         1.02    GRG 1998.06.17 support older versions of EPIA
  17
  18 */
  19
  20 #define EPIA_VERSION      "1.02"
  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 /* mode codes:  0  nybble reads on port 1, 8-bit writes
  33                 1  5/3 reads on ports 1 & 2, 8-bit writes
  34                 2  8-bit reads and writes
  35                 3  8-bit EPP mode
  36                 4  16-bit EPP
  37                 5  32-bit EPP
  38 */
  39
  40 #define j44(a,b)                (((a>>4)&0x0f)+(b&0xf0))
  41 #define j53(a,b)                (((a>>3)&0x1f)+((b<<4)&0xe0))
  42
  43 /* cont =  0   IDE register file
  44    cont =  1   IDE control registers
  45 */
  46
  47 static int cont_map[2] = { 0, 0x80 };
  48
  49 static int epia_read_regr( PIA *pi, int cont, int regr )
  50
  51 {       int     a, b, r;
  52
  53         regr += cont_map[cont];
  54
  55         switch (pi->mode)  {
  56
  57         case 0: r = regr^0x39;
  58                 w0(r); w2(1); w2(3); w0(r);
  59                 a = r1(); w2(1); b = r1(); w2(4);
  60                 return j44(a,b);
  61
  62         case 1: r = regr^0x31;
  63                 w0(r); w2(1); w0(r&0x37);
  64                 w2(3); w2(5); w0(r|0xf0);
  65                 a = r1(); b = r2(); w2(4);
  66                 return j53(a,b);
  67
  68         case 2: r = regr^0x29;
  69                 w0(r); w2(1); w2(0X21); w2(0x23);
  70                 a = r0(); w2(4);
  71                 return a;
  72
  73         case 3:
  74         case 4:
  75         case 5: w3(regr); w2(0x24); a = r4(); w2(4);
  76                 return a;
  77
  78         }
  79         return -1;
  80 }
  81
  82 static void epia_write_regr( PIA *pi, int cont, int regr, int val)
  83
  84 {       int  r;
  85
  86         regr += cont_map[cont];
  87
  88         switch (pi->mode)  {
  89
  90         case 0:
  91         case 1:
  92         case 2: r = regr^0x19;
  93                 w0(r); w2(1); w0(val); w2(3); w2(4);
  94                 break;
  95
  96         case 3:
  97         case 4:
  98         case 5: r = regr^0x40;
  99                 w3(r); w4(val); w2(4);
 100                 break;
 101         }
 102 }
 103
 104 #define WR(r,v)         epia_write_regr(pi,0,r,v)
 105 #define RR(r)           (epia_read_regr(pi,0,r))
 106
 107 /* The use of register 0x84 is entirely unclear - it seems to control
 108    some EPP counters ...  currently we know about 3 different block
 109    sizes:  the standard 512 byte reads and writes, 12 byte writes and
 110    2048 byte reads (the last two being used in the CDrom drivers.
 111 */
 112
 113 static void epia_connect ( PIA *pi  )
 114
 115 {       pi->saved_r0 = r0();
 116         pi->saved_r2 = r2();
 117
 118         w2(4); w0(0xa0); w0(0x50); w0(0xc0); w0(0x30); w0(0xa0); w0(0);
 119         w2(1); w2(4);
 120         if (pi->mode >= 3) {
 121                 w0(0xa); w2(1); w2(4); w0(0x82); w2(4); w2(0xc); w2(4);
 122                 w2(0x24); w2(0x26); w2(4);
 123         }
 124         WR(0x86,8);
 125 }
 126
 127 static void epia_disconnect ( PIA *pi )
 128
 129 {       /* WR(0x84,0x10); */
 130         w0(pi->saved_r0);
 131         w2(1); w2(4);
 132         w0(pi->saved_r0);
 133         w2(pi->saved_r2);
 134 }
 135
 136 static void epia_read_block( PIA *pi, char * buf, int count )
 137
 138 {       int     k, ph, a, b;
 139
 140         switch (pi->mode) {
 141
 142         case 0: w0(0x81); w2(1); w2(3); w0(0xc1);
 143                 ph = 1;
 144                 for (k=0;k<count;k++) {
 145                         w2(2+ph); a = r1();
 146                         w2(4+ph); b = r1();
 147                         buf[k] = j44(a,b);
 148                         ph = 1 - ph;
 149                 }
 150                 w0(0); w2(4);
 151                 break;
 152
 153         case 1: w0(0x91); w2(1); w0(0x10); w2(3);
 154                 w0(0x51); w2(5); w0(0xd1);
 155                 ph = 1;
 156                 for (k=0;k<count;k++) {
 157                         w2(4+ph);
 158                         a = r1(); b = r2();
 159                         buf[k] = j53(a,b);
 160                         ph = 1 - ph;
 161                 }
 162                 w0(0); w2(4);
 163                 break;
 164
 165         case 2: w0(0x89); w2(1); w2(0x23); w2(0x21);
 166                 ph = 1;
 167                 for (k=0;k<count;k++) {
 168                         w2(0x24+ph);
 169                         buf[k] = r0();
 170                         ph = 1 - ph;
 171                 }
 172                 w2(6); w2(4);
 173                 break;
 174
 175         case 3: if (count > 512) WR(0x84,3);
 176                 w3(0); w2(0x24);
 177                 for (k=0;k<count;k++) buf[k] = r4();
 178                 w2(4); WR(0x84,0);
 179                 break;
 180
 181         case 4: if (count > 512) WR(0x84,3);
 182                 w3(0); w2(0x24);
 183                 for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
 184                 w2(4); WR(0x84,0);
 185                 break;
 186
 187         case 5: if (count > 512) WR(0x84,3);
 188                 w3(0); w2(0x24);
 189                 for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
 190                 w2(4); WR(0x84,0);
 191                 break;
 192
 193         }
 194 }
 195
 196 static void epia_write_block( PIA *pi, char * buf, int count )
 197
 198 {       int     ph, k, last, d;
 199
 200         switch (pi->mode) {
 201
 202         case 0:
 203         case 1:
 204         case 2: w0(0xa1); w2(1); w2(3); w2(1); w2(5);
 205                 ph = 0;  last = 0x8000;
 206                 for (k=0;k<count;k++) {
 207                         d = buf[k];
 208                         if (d != last) { last = d; w0(d); }
 209                         w2(4+ph);
 210                         ph = 1 - ph;
 211                 }
 212                 w2(7); w2(4);
 213                 break;
 214
 215         case 3: if (count < 512) WR(0x84,1);
 216                 w3(0x40);
 217                 for (k=0;k<count;k++) w4(buf[k]);
 218                 if (count < 512) WR(0x84,0);
 219                 break;
 220
 221         case 4: if (count < 512) WR(0x84,1);
 222                 w3(0x40);
 223                 for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
 224                 if (count < 512) WR(0x84,0);
 225                 break;
 226
 227         case 5: if (count < 512) WR(0x84,1);
 228                 w3(0x40);
 229                 for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
 230                 if (count < 512) WR(0x84,0);
 231                 break;
 232
 233         }
 234
 235 }
 236
 237 static int epia_test_proto( PIA *pi, char * scratch, int verbose )
 238
 239 {       int     j, k, f;
 240         int     e[2] = {0,0};
 241
 242         epia_connect(pi);
 243         for (j=0;j<2;j++) {
 244             WR(6,0xa0+j*0x10);
 245             for (k=0;k<256;k++) {
 246                 WR(2,k^0xaa);
 247                 WR(3,k^0x55);
 248                 if (RR(2) != (k^0xaa)) e[j]++;
 249                 }
 250             WR(2,1); WR(3,1);
 251             }
 252         epia_disconnect(pi);
 253
 254         f = 0;
 255         epia_connect(pi);
 256         WR(0x84,8);
 257         epia_read_block(pi,scratch,512);
 258         for (k=0;k<256;k++) {
 259             if ((scratch[2*k] & 0xff) != ((k+1) & 0xff)) f++;
 260             if ((scratch[2*k+1] & 0xff) != ((-2-k) & 0xff)) f++;
 261         }
 262         WR(0x84,0);
 263         epia_disconnect(pi);
 264
 265         if (verbose)  {
 266             printk("%s: epia: port 0x%x, mode %d, test=(%d,%d,%d)\n",
 267                    pi->device,pi->port,pi->mode,e[0],e[1],f);
 268         }
 269
 270         return (e[0] && e[1]) || f;
 271
 272 }
 273
 274
 275 static void epia_log_adapter( PIA *pi, char * scratch, int verbose )
 276
 277 {       char    *mode_string[6] = {"4-bit","5/3","8-bit",
 278                                    "EPP-8","EPP-16","EPP-32"};
 279
 280         printk("%s: epia %s, Shuttle EPIA at 0x%x, ",
 281                 pi->device,EPIA_VERSION,pi->port);
 282         printk("mode %d (%s), delay %d\n",pi->mode,
 283                 mode_string[pi->mode],pi->delay);
 284
 285 }
 286
 287 static struct pi_protocol epia = {
 288         .owner          = THIS_MODULE,
 289         .name           = "epia",
 290         .max_mode       = 6,
 291         .epp_first      = 3,
 292         .default_delay  = 1,
 293         .max_units      = 1,
 294         .write_regr     = epia_write_regr,
 295         .read_regr      = epia_read_regr,
 296         .write_block    = epia_write_block,
 297         .read_block     = epia_read_block,
 298         .connect        = epia_connect,
 299         .disconnect     = epia_disconnect,
 300         .test_proto     = epia_test_proto,
 301         .log_adapter    = epia_log_adapter,
 302 };
 303
 304 static int __init epia_init(void)
 305 {
 306         return pi_register(&epia)-1;
 307 }
 308
 309 static void __exit epia_exit(void)
 310 {
 311         pi_unregister(&epia);
 312 }
 313
 314 MODULE_LICENSE("GPL");
 315 module_init(epia_init)
 316 module_exit(epia_exit)