linux/drivers/block/paride/dstr.c
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   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
  45static int  cont_map[2] = { 0x20, 0x40 };
  46
  47static 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
  74static 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
 101static 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
 108static void dstr_disconnect ( PIA *pi )
 109
 110{       CCP(0x30);
 111        w0(pi->saved_r0);
 112        w2(pi->saved_r2);
 113} 
 114
 115static 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
 157static 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
 193static 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
 205static 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
 221static int __init dstr_init(void)
 222{
 223        return paride_register(&dstr);
 224}
 225
 226static void __exit dstr_exit(void)
 227{
 228        paride_unregister(&dstr);
 229}
 230
 231MODULE_LICENSE("GPL");
 232module_init(dstr_init)
 233module_exit(dstr_exit)
 234
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