sys/bus/ppbus/ppb_msq.c

   1 /*-
   2  * Copyright (c) 1998, 1999 Nicolas Souchu
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/dev/ppbus/ppb_msq.c,v 1.9.2.1 2000/05/24 00:20:57 n_hibma Exp $
  27  * $DragonFly: src/sys/bus/ppbus/ppb_msq.c,v 1.7 2005/03/23 17:22:21 joerg Exp $
  28  *
  29  */
  30 #include <machine/stdarg.h>
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/bus.h>
  35
  36 #include "ppbconf.h"
  37 #include "ppb_msq.h"
  38
  39 #include "ppbus_if.h"
  40
  41 /* msq index (see PPB_MAX_XFER)
  42  * These are device modes
  43  */
  44 #define COMPAT_MSQ      0x0
  45 #define NIBBLE_MSQ      0x1
  46 #define PS2_MSQ         0x2
  47 #define EPP17_MSQ       0x3
  48 #define EPP19_MSQ       0x4
  49 #define ECP_MSQ         0x5
  50
  51 /*
  52  * Device mode to submsq conversion
  53  */
  54 static struct ppb_xfer *
  55 mode2xfer(device_t bus, struct ppb_device *ppbdev, int opcode)
  56 {
  57         int index, epp;
  58         struct ppb_xfer *table;
  59
  60         switch (opcode) {
  61         case MS_OP_GET:
  62                 table = ppbdev->get_xfer;
  63                 break;
  64
  65         case MS_OP_PUT:
  66                 table = ppbdev->put_xfer;
  67                 break;
  68
  69         default:
  70                 panic("%s: unknown opcode (%d)", __func__, opcode);
  71         }
  72
  73         /* retrieve the device operating mode */
  74         switch (ppb_get_mode(bus)) {
  75         case PPB_COMPATIBLE:
  76                 index = COMPAT_MSQ;
  77                 break;
  78         case PPB_NIBBLE:
  79                 index = NIBBLE_MSQ;
  80                 break;
  81         case PPB_PS2:
  82                 index = PS2_MSQ;
  83                 break;
  84         case PPB_EPP:
  85                 switch ((epp = ppb_get_epp_protocol(bus))) {
  86                 case EPP_1_7:
  87                         index = EPP17_MSQ;
  88                         break;
  89                 case EPP_1_9:
  90                         index = EPP19_MSQ;
  91                         break;
  92                 default:
  93                         panic("%s: unknown EPP protocol (0x%x)!", __func__,
  94                                 epp);
  95                 }
  96                 break;
  97         case PPB_ECP:
  98                 index = ECP_MSQ;
  99                 break;
 100         default:
 101                 panic("%s: unknown mode (%d)", __func__, ppbdev->mode);
 102         }
 103
 104         return (&table[index]);
 105 }
 106
 107 /*
 108  * ppb_MS_init()
 109  *
 110  * Initialize device dependent submicrosequence of the current mode
 111  *
 112  */
 113 int
 114 ppb_MS_init(device_t bus, device_t dev, struct ppb_microseq *loop, int opcode)
 115 {
 116         struct ppb_device *ppbdev = (struct ppb_device *)device_get_ivars(dev);
 117         struct ppb_xfer *xfer = mode2xfer(bus, ppbdev, opcode);
 118
 119         xfer->loop = loop;
 120
 121         return (0);
 122 }
 123
 124 /*
 125  * ppb_MS_exec()
 126  *
 127  * Execute any microsequence opcode - expensive
 128  *
 129  */
 130 int
 131 ppb_MS_exec(device_t bus, device_t dev, int opcode, union ppb_insarg param1,
 132                 union ppb_insarg param2, union ppb_insarg param3, int *ret)
 133 {
 134         struct ppb_microseq msq[] = {
 135                   { MS_UNKNOWN, { { MS_UNKNOWN }, { MS_UNKNOWN }, { MS_UNKNOWN } } },
 136                   MS_RET(0)
 137         };
 138
 139         /* initialize the corresponding microseq */
 140         msq[0].opcode = opcode;
 141         msq[0].arg[0] = param1;
 142         msq[0].arg[1] = param2;
 143         msq[0].arg[2] = param3;
 144
 145         /* execute the microseq */
 146         return (ppb_MS_microseq(bus, dev, msq, ret));
 147 }
 148
 149 /*
 150  * ppb_MS_loop()
 151  *
 152  * Execute a microseq loop
 153  *
 154  */
 155 int
 156 ppb_MS_loop(device_t bus, device_t dev, struct ppb_microseq *prolog,
 157                 struct ppb_microseq *body, struct ppb_microseq *epilog,
 158                 int iter, int *ret)
 159 {
 160         struct ppb_microseq loop_microseq[] = {
 161                   MS_CALL(0),                   /* execute prolog */
 162
 163                   MS_SET(MS_UNKNOWN),           /* set size of transfer */
 164         /* loop: */
 165                   MS_CALL(0),                   /* execute body */
 166                   MS_DBRA(-1 /* loop: */),
 167
 168                   MS_CALL(0),                   /* execute epilog */
 169                   MS_RET(0)
 170         };
 171
 172         /* initialize the structure */
 173         loop_microseq[0].arg[0].p = (void *)prolog;
 174         loop_microseq[1].arg[0].i = iter;
 175         loop_microseq[2].arg[0].p = (void *)body;
 176         loop_microseq[4].arg[0].p = (void *)epilog;
 177
 178         /* execute the loop */
 179         return (ppb_MS_microseq(bus, dev, loop_microseq, ret));
 180 }
 181
 182 /*
 183  * ppb_MS_init_msq()
 184  *
 185  * Initialize a microsequence - see macros in ppb_msq.h
 186  *
 187  */
 188 int
 189 ppb_MS_init_msq(struct ppb_microseq *msq, int nbparam, ...)
 190 {
 191         int i;
 192         int param, ins, arg, type;
 193         __va_list p_list;
 194
 195         __va_start(p_list, nbparam);
 196
 197         for (i=0; i<nbparam; i++) {
 198                 /* retrieve the parameter descriptor */
 199                 param = __va_arg(p_list, int);
 200
 201                 ins  = MS_INS(param);
 202                 arg  = MS_ARG(param);
 203                 type = MS_TYP(param);
 204
 205                 /* check the instruction position */
 206                 if (arg >= PPB_MS_MAXARGS)
 207                         panic("%s: parameter out of range (0x%x)!",
 208                                 __func__, param);
 209
 210 #if 0
 211                 printf("%s: param = %d, ins = %d, arg = %d, type = %d\n",
 212                         __func__, param, ins, arg, type);
 213 #endif
 214
 215                 /* properly cast the parameter */
 216                 switch (type) {
 217                 case MS_TYP_INT:
 218                         msq[ins].arg[arg].i = __va_arg(p_list, int);
 219                         break;
 220
 221                 case MS_TYP_CHA:
 222                         msq[ins].arg[arg].i = (int)__va_arg(p_list, int);
 223                         break;
 224
 225                 case MS_TYP_PTR:
 226                         msq[ins].arg[arg].p = __va_arg(p_list, void *);
 227                         break;
 228
 229                 case MS_TYP_FUN:
 230                         msq[ins].arg[arg].f = __va_arg(p_list, void *);
 231                         break;
 232
 233                 default:
 234                         panic("%s: unknown parameter (0x%x)!", __func__,
 235                                 param);
 236                 }
 237         }
 238
 239         return (0);
 240 }
 241
 242 /*
 243  * ppb_MS_microseq()
 244  *
 245  * Interprete a microsequence. Some microinstructions are executed at adapter
 246  * level to avoid function call overhead between ppbus and the adapter
 247  */
 248 int
 249 ppb_MS_microseq(device_t bus, device_t dev, struct ppb_microseq *msq, int *ret)
 250 {
 251         struct ppb_data *ppb = (struct ppb_data *)device_get_softc(bus);
 252         struct ppb_device *ppbdev = (struct ppb_device *)device_get_ivars(dev);
 253
 254         struct ppb_microseq *mi;                /* current microinstruction */
 255         int error;
 256
 257         struct ppb_xfer *xfer;
 258
 259         /* microsequence executed to initialize the transfer */
 260         struct ppb_microseq initxfer[] = {
 261                 MS_PTR(MS_UNKNOWN),     /* set ptr to buffer */
 262                 MS_SET(MS_UNKNOWN),     /* set transfer size */
 263                 MS_RET(0)
 264         };
 265
 266         if (ppb->ppb_owner != dev)
 267                 return (EACCES);
 268
 269 #define INCR_PC (mi ++)
 270
 271         mi = msq;
 272         for (;;) {
 273                 switch (mi->opcode) {
 274                 case MS_OP_PUT:
 275                 case MS_OP_GET:
 276
 277                         /* attempt to choose the best mode for the device */
 278                         xfer = mode2xfer(bus, ppbdev, mi->opcode);
 279
 280                         /* figure out if we should use ieee1284 code */
 281                         if (!xfer->loop) {
 282                                 if (mi->opcode == MS_OP_PUT) {
 283                                         if ((error = PPBUS_WRITE(
 284                                                 device_get_parent(bus),
 285                                                 (char *)mi->arg[0].p,
 286                                                 mi->arg[1].i, 0)))
 287                                                         goto error;
 288
 289                                         INCR_PC;
 290                                         continue;
 291                                 } else {
 292                                         panic("%s: IEEE1284 read not supported", __func__);
 293                                 }
 294                         }
 295
 296                         /* XXX should use ppb_MS_init_msq() */
 297                         initxfer[0].arg[0].p = mi->arg[0].p;
 298                         initxfer[1].arg[0].i = mi->arg[1].i;
 299
 300                         /* initialize transfer */
 301                         ppb_MS_microseq(bus, dev, initxfer, &error);
 302
 303                         if (error)
 304                                 goto error;
 305
 306                         /* the xfer microsequence should not contain any
 307                          * MS_OP_PUT or MS_OP_GET!
 308                          */
 309                         ppb_MS_microseq(bus, dev, xfer->loop, &error);
 310
 311                         if (error)
 312                                 goto error;
 313
 314                         INCR_PC;
 315                         break;
 316
 317                 case MS_OP_RET:
 318                         if (ret)
 319                                 *ret = mi->arg[0].i;    /* return code */
 320                         return (0);
 321                         break;
 322
 323                 default:
 324                         /* executing microinstructions at ppc level is
 325                          * faster. This is the default if the microinstr
 326                          * is unknown here
 327                          */
 328                         if ((error = PPBUS_EXEC_MICROSEQ(
 329                                                 device_get_parent(bus), &mi)))
 330                                 goto error;
 331                         break;
 332                 }
 333         }
 334 error:
 335         return (error);
 336 }
 337