drivers/block/paride/comm.c

   1 /*
   2         comm.c    (c) 1997-8  Grant R. Guenther <grant@torque.net>
   3                               Under the terms of the GNU General Public License.
   4
   5         comm.c is a low-level protocol driver for some older models
   6         of the DataStor "Commuter" parallel to IDE adapter.  Some of
   7         the parallel port devices marketed by Arista currently
   8         use this adapter.
   9 */
  10
  11 /* Changes:
  12
  13         1.01    GRG 1998.05.05  init_proto, release_proto
  14
  15 */
  16
  17 #define COMM_VERSION      "1.01"
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22 #include <linux/kernel.h>
  23 #include <linux/types.h>
  24 #include <linux/wait.h>
  25 #include <asm/io.h>
  26
  27 #include "paride.h"
  28
  29 /* mode codes:  0  nybble reads, 8-bit writes
  30                 1  8-bit reads and writes
  31                 2  8-bit EPP mode
  32 */
  33
  34 #define j44(a,b)        (((a>>3)&0x0f)|((b<<1)&0xf0))
  35
  36 #define P1      w2(5);w2(0xd);w2(0xd);w2(5);w2(4);
  37 #define P2      w2(5);w2(7);w2(7);w2(5);w2(4);
  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] = { 0x08, 0x10 };
  44
  45 static int comm_read_regr( PIA *pi, int cont, int regr )
  46
  47 {       int     l, h, r;
  48
  49         r = regr + cont_map[cont];
  50
  51         switch (pi->mode)  {
  52
  53         case 0: w0(r); P1; w0(0);
  54                 w2(6); l = r1(); w0(0x80); h = r1(); w2(4);
  55                 return j44(l,h);
  56
  57         case 1: w0(r+0x20); P1;
  58                 w0(0); w2(0x26); h = r0(); w2(4);
  59                 return h;
  60
  61         case 2:
  62         case 3:
  63         case 4: w3(r+0x20); r1();
  64                 w2(0x24); h = r4(); w2(4);
  65                 return h;
  66
  67         }
  68         return -1;
  69 }
  70
  71 static void comm_write_regr( PIA *pi, int cont, int regr, int val )
  72
  73 {       int  r;
  74
  75         r = regr + cont_map[cont];
  76
  77         switch (pi->mode)  {
  78
  79         case 0:
  80         case 1: w0(r); P1; w0(val); P2;
  81                 break;
  82
  83         case 2:
  84         case 3:
  85         case 4: w3(r); r1(); w4(val);
  86                 break;
  87         }
  88 }
  89
  90 static void comm_connect ( PIA *pi  )
  91
  92 {       pi->saved_r0 = r0();
  93         pi->saved_r2 = r2();
  94         w2(4); w0(0xff); w2(6);
  95         w2(4); w0(0xaa); w2(6);
  96         w2(4); w0(0x00); w2(6);
  97         w2(4); w0(0x87); w2(6);
  98         w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4);
  99 }
 100
 101 static void comm_disconnect ( PIA *pi )
 102
 103 {       w2(0); w2(0); w2(0); w2(4);
 104         w0(pi->saved_r0);
 105         w2(pi->saved_r2);
 106 }
 107
 108 static void comm_read_block( PIA *pi, char * buf, int count )
 109
 110 {       int     i, l, h;
 111
 112         switch (pi->mode) {
 113
 114         case 0: w0(0x48); P1;
 115                 for(i=0;i<count;i++) {
 116                         w0(0); w2(6); l = r1();
 117                         w0(0x80); h = r1(); w2(4);
 118                         buf[i] = j44(l,h);
 119                 }
 120                 break;
 121
 122         case 1: w0(0x68); P1; w0(0);
 123                 for(i=0;i<count;i++) {
 124                         w2(0x26); buf[i] = r0(); w2(0x24);
 125                 }
 126                 w2(4);
 127                 break;
 128
 129         case 2: w3(0x68); r1(); w2(0x24);
 130                 for (i=0;i<count;i++) buf[i] = r4();
 131                 w2(4);
 132                 break;
 133
 134         case 3: w3(0x68); r1(); w2(0x24);
 135                 for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
 136                 w2(4);
 137                 break;
 138
 139         case 4: w3(0x68); r1(); w2(0x24);
 140                 for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l();
 141                 w2(4);
 142                 break;
 143
 144         }
 145 }
 146
 147 /* NB: Watch out for the byte swapped writes ! */
 148
 149 static void comm_write_block( PIA *pi, char * buf, int count )
 150
 151 {       int     k;
 152
 153         switch (pi->mode) {
 154
 155         case 0:
 156         case 1: w0(0x68); P1;
 157                 for (k=0;k<count;k++) {
 158                         w2(5); w0(buf[k^1]); w2(7);
 159                 }
 160                 w2(5); w2(4);
 161                 break;
 162
 163         case 2: w3(0x48); r1();
 164                 for (k=0;k<count;k++) w4(buf[k^1]);
 165                 break;
 166
 167         case 3: w3(0x48); r1();
 168                 for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k));
 169                 break;
 170
 171         case 4: w3(0x48); r1();
 172                 for (k=0;k<count/4;k++) w4l(pi_swab32(buf,k));
 173                 break;
 174
 175
 176         }
 177 }
 178
 179 static void comm_log_adapter( PIA *pi, char * scratch, int verbose )
 180
 181 {       char    *mode_string[5] = {"4-bit","8-bit","EPP-8","EPP-16","EPP-32"};
 182
 183         printk("%s: comm %s, DataStor Commuter at 0x%x, ",
 184                 pi->device,COMM_VERSION,pi->port);
 185         printk("mode %d (%s), delay %d\n",pi->mode,
 186                 mode_string[pi->mode],pi->delay);
 187
 188 }
 189
 190 static struct pi_protocol comm = {
 191         .owner          = THIS_MODULE,
 192         .name           = "comm",
 193         .max_mode       = 5,
 194         .epp_first      = 2,
 195         .default_delay  = 1,
 196         .max_units      = 1,
 197         .write_regr     = comm_write_regr,
 198         .read_regr      = comm_read_regr,
 199         .write_block    = comm_write_block,
 200         .read_block     = comm_read_block,
 201         .connect        = comm_connect,
 202         .disconnect     = comm_disconnect,
 203         .log_adapter    = comm_log_adapter,
 204 };
 205
 206 static int __init comm_init(void)
 207 {
 208         return pi_register(&comm)-1;
 209 }
 210
 211 static void __exit comm_exit(void)
 212 {
 213         pi_unregister(&comm);
 214 }
 215
 216 MODULE_LICENSE("GPL");
 217 module_init(comm_init)
 218 module_exit(comm_exit)