drivers/block/paride/frpw.c

   1 /*
   2         frpw.c  (c) 1996-8  Grant R. Guenther <grant@torque.net>
   3                             Under the terms of the GNU General Public License
   4
   5         frpw.c is a low-level protocol driver for the Freecom "Power"
   6         parallel port IDE adapter.
   7
   8         Some applications of this adapter may require a "printer" reset
   9         prior to loading the driver.  This can be done by loading and
  10         unloading the "lp" driver, or it can be done by this driver
  11         if you define FRPW_HARD_RESET.  The latter is not recommended
  12         as it may upset devices on other ports.
  13
  14 */
  15
  16 /* Changes:
  17
  18         1.01    GRG 1998.05.06 init_proto, release_proto
  19                                fix chip detect
  20                                added EPP-16 and EPP-32
  21         1.02    GRG 1998.09.23 added hard reset to initialisation process
  22         1.03    GRG 1998.12.14 made hard reset conditional
  23
  24 */
  25
  26 #define FRPW_VERSION    "1.03"
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/delay.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/wait.h>
  34 #include <asm/io.h>
  35
  36 #include "paride.h"
  37
  38 #define cec4            w2(0xc);w2(0xe);w2(0xe);w2(0xc);w2(4);w2(4);w2(4);
  39 #define j44(l,h)        (((l>>4)&0x0f)|(h&0xf0))
  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] = { 0x08, 0x10 };
  46
  47 static int frpw_read_regr( PIA *pi, int cont, int regr )
  48
  49 {       int     h,l,r;
  50
  51         r = regr + cont_map[cont];
  52
  53         w2(4);
  54         w0(r); cec4;
  55         w2(6); l = r1();
  56         w2(4); h = r1();
  57         w2(4);
  58
  59         return j44(l,h);
  60
  61 }
  62
  63 static void frpw_write_regr( PIA *pi, int cont, int regr, int val)
  64
  65 {       int r;
  66
  67         r = regr + cont_map[cont];
  68
  69         w2(4); w0(r); cec4;
  70         w0(val);
  71         w2(5);w2(7);w2(5);w2(4);
  72 }
  73
  74 static void frpw_read_block_int( PIA *pi, char * buf, int count, int regr )
  75
  76 {       int     h, l, k, ph;
  77
  78         switch(pi->mode) {
  79
  80         case 0: w2(4); w0(regr); cec4;
  81                 for (k=0;k<count;k++) {
  82                         w2(6); l = r1();
  83                         w2(4); h = r1();
  84                         buf[k] = j44(l,h);
  85                 }
  86                 w2(4);
  87                 break;
  88
  89         case 1: ph = 2;
  90                 w2(4); w0(regr + 0xc0); cec4;
  91                 w0(0xff);
  92                 for (k=0;k<count;k++) {
  93                         w2(0xa4 + ph);
  94                         buf[k] = r0();
  95                         ph = 2 - ph;
  96                 }
  97                 w2(0xac); w2(0xa4); w2(4);
  98                 break;
  99
 100         case 2: w2(4); w0(regr + 0x80); cec4;
 101                 for (k=0;k<count;k++) buf[k] = r4();
 102                 w2(0xac); w2(0xa4);
 103                 w2(4);
 104                 break;
 105
 106         case 3: w2(4); w0(regr + 0x80); cec4;
 107                 for (k=0;k<count-2;k++) buf[k] = r4();
 108                 w2(0xac); w2(0xa4);
 109                 buf[count-2] = r4();
 110                 buf[count-1] = r4();
 111                 w2(4);
 112                 break;
 113
 114         case 4: w2(4); w0(regr + 0x80); cec4;
 115                 for (k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
 116                 w2(0xac); w2(0xa4);
 117                 buf[count-2] = r4();
 118                 buf[count-1] = r4();
 119                 w2(4);
 120                 break;
 121
 122         case 5: w2(4); w0(regr + 0x80); cec4;
 123                 for (k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
 124                 buf[count-4] = r4();
 125                 buf[count-3] = r4();
 126                 w2(0xac); w2(0xa4);
 127                 buf[count-2] = r4();
 128                 buf[count-1] = r4();
 129                 w2(4);
 130                 break;
 131
 132         }
 133 }
 134
 135 static void frpw_read_block( PIA *pi, char * buf, int count)
 136
 137 {       frpw_read_block_int(pi,buf,count,0x08);
 138 }
 139
 140 static void frpw_write_block( PIA *pi, char * buf, int count )
 141
 142 {       int     k;
 143
 144         switch(pi->mode) {
 145
 146         case 0:
 147         case 1:
 148         case 2: w2(4); w0(8); cec4; w2(5);
 149                 for (k=0;k<count;k++) {
 150                         w0(buf[k]);
 151                         w2(7);w2(5);
 152                 }
 153                 w2(4);
 154                 break;
 155
 156         case 3: w2(4); w0(0xc8); cec4; w2(5);
 157                 for (k=0;k<count;k++) w4(buf[k]);
 158                 w2(4);
 159                 break;
 160
 161         case 4: w2(4); w0(0xc8); cec4; w2(5);
 162                 for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
 163                 w2(4);
 164                 break;
 165
 166         case 5: w2(4); w0(0xc8); cec4; w2(5);
 167                 for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
 168                 w2(4);
 169                 break;
 170         }
 171 }
 172
 173 static void frpw_connect ( PIA *pi  )
 174
 175 {       pi->saved_r0 = r0();
 176         pi->saved_r2 = r2();
 177         w2(4);
 178 }
 179
 180 static void frpw_disconnect ( PIA *pi )
 181
 182 {       w2(4); w0(0x20); cec4;
 183         w0(pi->saved_r0);
 184         w2(pi->saved_r2);
 185 }
 186
 187 /* Stub logic to see if PNP string is available - used to distinguish
 188    between the Xilinx and ASIC implementations of the Freecom adapter.
 189 */
 190
 191 static int frpw_test_pnp ( PIA *pi )
 192
 193 /*  returns chip_type:   0 = Xilinx, 1 = ASIC   */
 194
 195 {       int olddelay, a, b;
 196
 197 #ifdef FRPW_HARD_RESET
 198         w0(0); w2(8); udelay(50); w2(0xc);   /* parallel bus reset */
 199         mdelay(1500);
 200 #endif
 201
 202         olddelay = pi->delay;
 203         pi->delay = 10;
 204
 205         pi->saved_r0 = r0();
 206         pi->saved_r2 = r2();
 207
 208         w2(4); w0(4); w2(6); w2(7);
 209         a = r1() & 0xff; w2(4); b = r1() & 0xff;
 210         w2(0xc); w2(0xe); w2(4);
 211
 212         pi->delay = olddelay;
 213         w0(pi->saved_r0);
 214         w2(pi->saved_r2);
 215
 216         return ((~a&0x40) && (b&0x40));
 217 }
 218
 219 /* We use the pi->private to remember the result of the PNP test.
 220    To make this work, private = port*2 + chip.  Yes, I know it's
 221    a hack :-(
 222 */
 223
 224 static int frpw_test_proto( PIA *pi, char * scratch, int verbose )
 225
 226 {       int     j, k, r;
 227         int     e[2] = {0,0};
 228
 229         if ((pi->private>>1) != pi->port)
 230            pi->private = frpw_test_pnp(pi) + 2*pi->port;
 231
 232         if (((pi->private%2) == 0) && (pi->mode > 2)) {
 233            if (verbose)
 234                 printk("%s: frpw: Xilinx does not support mode %d\n",
 235                         pi->device, pi->mode);
 236            return 1;
 237         }
 238
 239         if (((pi->private%2) == 1) && (pi->mode == 2)) {
 240            if (verbose)
 241                 printk("%s: frpw: ASIC does not support mode 2\n",
 242                         pi->device);
 243            return 1;
 244         }
 245
 246         frpw_connect(pi);
 247         for (j=0;j<2;j++) {
 248                 frpw_write_regr(pi,0,6,0xa0+j*0x10);
 249                 for (k=0;k<256;k++) {
 250                         frpw_write_regr(pi,0,2,k^0xaa);
 251                         frpw_write_regr(pi,0,3,k^0x55);
 252                         if (frpw_read_regr(pi,0,2) != (k^0xaa)) e[j]++;
 253                         }
 254                 }
 255         frpw_disconnect(pi);
 256
 257         frpw_connect(pi);
 258         frpw_read_block_int(pi,scratch,512,0x10);
 259         r = 0;
 260         for (k=0;k<128;k++) if (scratch[k] != k) r++;
 261         frpw_disconnect(pi);
 262
 263         if (verbose)  {
 264             printk("%s: frpw: port 0x%x, chip %ld, mode %d, test=(%d,%d,%d)\n",
 265                    pi->device,pi->port,(pi->private%2),pi->mode,e[0],e[1],r);
 266         }
 267
 268         return (r || (e[0] && e[1]));
 269 }
 270
 271
 272 static void frpw_log_adapter( PIA *pi, char * scratch, int verbose )
 273
 274 {       char    *mode_string[6] = {"4-bit","8-bit","EPP",
 275                                    "EPP-8","EPP-16","EPP-32"};
 276
 277         printk("%s: frpw %s, Freecom (%s) adapter at 0x%x, ", pi->device,
 278                 FRPW_VERSION,((pi->private%2) == 0)?"Xilinx":"ASIC",pi->port);
 279         printk("mode %d (%s), delay %d\n",pi->mode,
 280                 mode_string[pi->mode],pi->delay);
 281
 282 }
 283
 284 static struct pi_protocol frpw = {
 285         .owner          = THIS_MODULE,
 286         .name           = "frpw",
 287         .max_mode       = 6,
 288         .epp_first      = 2,
 289         .default_delay  = 2,
 290         .max_units      = 1,
 291         .write_regr     = frpw_write_regr,
 292         .read_regr      = frpw_read_regr,
 293         .write_block    = frpw_write_block,
 294         .read_block     = frpw_read_block,
 295         .connect        = frpw_connect,
 296         .disconnect     = frpw_disconnect,
 297         .test_proto     = frpw_test_proto,
 298         .log_adapter    = frpw_log_adapter,
 299 };
 300
 301 static int __init frpw_init(void)
 302 {
 303         return pi_register(&frpw)-1;
 304 }
 305
 306 static void __exit frpw_exit(void)
 307 {
 308         pi_unregister(&frpw);
 309 }
 310
 311 MODULE_LICENSE("GPL");
 312 module_init(frpw_init)
 313 module_exit(frpw_exit)