drivers/block/paride/kbic.c

   1 /*
   2         kbic.c    (c) 1997-8  Grant R. Guenther <grant@torque.net>
   3                               Under the terms of the GNU General Public License.
   4
   5         This is a low-level driver for the KBIC-951A and KBIC-971A
   6         parallel to IDE adapter chips from KingByte Information Systems.
   7
   8         The chips are almost identical, however, the wakeup code
   9         required for the 971A interferes with the correct operation of
  10         the 951A, so this driver registers itself twice, once for
  11         each chip.
  12
  13 */
  14
  15 /* Changes:
  16
  17         1.01    GRG 1998.05.06 init_proto, release_proto
  18
  19 */
  20
  21 #define KBIC_VERSION      "1.01"
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/kernel.h>
  27 #include <linux/types.h>
  28 #include <linux/wait.h>
  29 #include <asm/io.h>
  30
  31 #include "paride.h"
  32
  33 #define r12w()                  (delay_p,inw(pi->port+1)&0xffff)
  34
  35 #define j44(a,b)                ((((a>>4)&0x0f)|(b&0xf0))^0x88)
  36 #define j53(w)                  (((w>>3)&0x1f)|((w>>4)&0xe0))
  37
  38
  39 /* cont = 0 - access the IDE register file
  40    cont = 1 - access the IDE command set
  41 */
  42
  43 static int  cont_map[2] = { 0x80, 0x40 };
  44
  45 static int kbic_read_regr( PIA *pi, int cont, int regr )
  46
  47 {       int     a, b, s;
  48
  49         s = cont_map[cont];
  50
  51         switch (pi->mode) {
  52
  53         case 0: w0(regr|0x18|s); w2(4); w2(6); w2(4); w2(1); w0(8);
  54                 a = r1(); w0(0x28); b = r1(); w2(4);
  55                 return j44(a,b);
  56
  57         case 1: w0(regr|0x38|s); w2(4); w2(6); w2(4); w2(5); w0(8);
  58                 a = r12w(); w2(4);
  59                 return j53(a);
  60
  61         case 2: w0(regr|0x08|s); w2(4); w2(6); w2(4); w2(0xa5); w2(0xa1);
  62                 a = r0(); w2(4);
  63                 return a;
  64
  65         case 3:
  66         case 4:
  67         case 5: w0(0x20|s); w2(4); w2(6); w2(4); w3(regr);
  68                 a = r4(); b = r4(); w2(4); w2(0); w2(4);
  69                 return a;
  70
  71         }
  72         return -1;
  73 }
  74
  75 static void  kbic_write_regr( PIA *pi, int cont, int regr, int val)
  76
  77 {       int  s;
  78
  79         s = cont_map[cont];
  80
  81         switch (pi->mode) {
  82
  83         case 0:
  84         case 1:
  85         case 2: w0(regr|0x10|s); w2(4); w2(6); w2(4);
  86                 w0(val); w2(5); w2(4);
  87                 break;
  88
  89         case 3:
  90         case 4:
  91         case 5: w0(0x20|s); w2(4); w2(6); w2(4); w3(regr);
  92                 w4(val); w4(val);
  93                 w2(4); w2(0); w2(4);
  94                 break;
  95
  96         }
  97 }
  98
  99 static void k951_connect ( PIA *pi  )
 100
 101 {       pi->saved_r0 = r0();
 102         pi->saved_r2 = r2();
 103         w2(4);
 104 }
 105
 106 static void k951_disconnect ( PIA *pi )
 107
 108 {       w0(pi->saved_r0);
 109         w2(pi->saved_r2);
 110 }
 111
 112 #define CCP(x)  w2(0xc4);w0(0xaa);w0(0x55);w0(0);w0(0xff);w0(0x87);\
 113                 w0(0x78);w0(x);w2(0xc5);w2(0xc4);w0(0xff);
 114
 115 static void k971_connect ( PIA *pi  )
 116
 117 {       pi->saved_r0 = r0();
 118         pi->saved_r2 = r2();
 119         CCP(0x20);
 120         w2(4);
 121 }
 122
 123 static void k971_disconnect ( PIA *pi )
 124
 125 {       CCP(0x30);
 126         w0(pi->saved_r0);
 127         w2(pi->saved_r2);
 128 }
 129
 130 /* counts must be congruent to 0 MOD 4, but all known applications
 131    have this property.
 132 */
 133
 134 static void kbic_read_block( PIA *pi, char * buf, int count )
 135
 136 {       int     k, a, b;
 137
 138         switch (pi->mode) {
 139
 140         case 0: w0(0x98); w2(4); w2(6); w2(4);
 141                 for (k=0;k<count/2;k++) {
 142                         w2(1); w0(8);    a = r1();
 143                                w0(0x28); b = r1();
 144                         buf[2*k]   = j44(a,b);
 145                         w2(5);           b = r1();
 146                                w0(8);    a = r1();
 147                         buf[2*k+1] = j44(a,b);
 148                         w2(4);
 149                 }
 150                 break;
 151
 152         case 1: w0(0xb8); w2(4); w2(6); w2(4);
 153                 for (k=0;k<count/4;k++) {
 154                         w0(0xb8);
 155                         w2(4); w2(5);
 156                         w0(8);    buf[4*k]   = j53(r12w());
 157                         w0(0xb8); buf[4*k+1] = j53(r12w());
 158                         w2(4); w2(5);
 159                                   buf[4*k+3] = j53(r12w());
 160                         w0(8);    buf[4*k+2] = j53(r12w());
 161                 }
 162                 w2(4);
 163                 break;
 164
 165         case 2: w0(0x88); w2(4); w2(6); w2(4);
 166                 for (k=0;k<count/2;k++) {
 167                         w2(0xa0); w2(0xa1); buf[2*k] = r0();
 168                         w2(0xa5); buf[2*k+1] = r0();
 169                 }
 170                 w2(4);
 171                 break;
 172
 173         case 3: w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 174                 for (k=0;k<count;k++) buf[k] = r4();
 175                 w2(4); w2(0); w2(4);
 176                 break;
 177
 178         case 4: w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 179                 for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
 180                 w2(4); w2(0); w2(4);
 181                 break;
 182
 183         case 5: w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 184                 for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
 185                 w2(4); w2(0); w2(4);
 186                 break;
 187
 188
 189         }
 190 }
 191
 192 static void kbic_write_block( PIA *pi, char * buf, int count )
 193
 194 {       int     k;
 195
 196         switch (pi->mode) {
 197
 198         case 0:
 199         case 1:
 200         case 2: w0(0x90); w2(4); w2(6); w2(4);
 201                 for(k=0;k<count/2;k++) {
 202                         w0(buf[2*k+1]); w2(0); w2(4);
 203                         w0(buf[2*k]);   w2(5); w2(4);
 204                 }
 205                 break;
 206
 207         case 3: w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 208                 for(k=0;k<count/2;k++) {
 209                         w4(buf[2*k+1]);
 210                         w4(buf[2*k]);
 211                 }
 212                 w2(4); w2(0); w2(4);
 213                 break;
 214
 215         case 4: w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 216                 for(k=0;k<count/2;k++) w4w(pi_swab16(buf,k));
 217                 w2(4); w2(0); w2(4);
 218                 break;
 219
 220         case 5: w0(0xa0); w2(4); w2(6); w2(4); w3(0);
 221                 for(k=0;k<count/4;k++) w4l(pi_swab32(buf,k));
 222                 w2(4); w2(0); w2(4);
 223                 break;
 224
 225         }
 226
 227 }
 228
 229 static void kbic_log_adapter( PIA *pi, char * scratch,
 230                               int verbose, char * chip )
 231
 232 {       char    *mode_string[6] = {"4-bit","5/3","8-bit",
 233                                    "EPP-8","EPP_16","EPP-32"};
 234
 235         printk("%s: kbic %s, KingByte %s at 0x%x, ",
 236                 pi->device,KBIC_VERSION,chip,pi->port);
 237         printk("mode %d (%s), delay %d\n",pi->mode,
 238                 mode_string[pi->mode],pi->delay);
 239
 240 }
 241
 242 static void k951_log_adapter( PIA *pi, char * scratch, int verbose )
 243
 244 {       kbic_log_adapter(pi,scratch,verbose,"KBIC-951A");
 245 }
 246
 247 static void k971_log_adapter( PIA *pi, char * scratch, int verbose )
 248
 249 {       kbic_log_adapter(pi,scratch,verbose,"KBIC-971A");
 250 }
 251
 252 static struct pi_protocol k951 = {
 253         .owner          = THIS_MODULE,
 254         .name           = "k951",
 255         .max_mode       = 6,
 256         .epp_first      = 3,
 257         .default_delay  = 1,
 258         .max_units      = 1,
 259         .write_regr     = kbic_write_regr,
 260         .read_regr      = kbic_read_regr,
 261         .write_block    = kbic_write_block,
 262         .read_block     = kbic_read_block,
 263         .connect        = k951_connect,
 264         .disconnect     = k951_disconnect,
 265         .log_adapter    = k951_log_adapter,
 266 };
 267
 268 static struct pi_protocol k971 = {
 269         .owner          = THIS_MODULE,
 270         .name           = "k971",
 271         .max_mode       = 6,
 272         .epp_first      = 3,
 273         .default_delay  = 1,
 274         .max_units      = 1,
 275         .write_regr     = kbic_write_regr,
 276         .read_regr      = kbic_read_regr,
 277         .write_block    = kbic_write_block,
 278         .read_block     = kbic_read_block,
 279         .connect        = k971_connect,
 280         .disconnect     = k971_disconnect,
 281         .log_adapter    = k971_log_adapter,
 282 };
 283
 284 static int __init kbic_init(void)
 285 {
 286         return (pi_register(&k951)||pi_register(&k971))-1;
 287 }
 288
 289 static void __exit kbic_exit(void)
 290 {
 291         pi_unregister(&k951);
 292         pi_unregister(&k971);
 293 }
 294
 295 MODULE_LICENSE("GPL");
 296 module_init(kbic_init)
 297 module_exit(kbic_exit)