ppb_msq.c

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    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  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 #include <machine/stdarg.h>
   32 
   33 #include <sys/param.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 
   39 #include <dev/ppbus/ppbconf.h>
   40 #include <dev/ppbus/ppb_msq.h>
   41 
   42 #include "ppbus_if.h"
   43 
   44 /* msq index (see PPB_MAX_XFER)
   45  * These are device modes
   46  */
   47 #define COMPAT_MSQ      0x0
   48 #define NIBBLE_MSQ      0x1
   49 #define PS2_MSQ         0x2
   50 #define EPP17_MSQ       0x3
   51 #define EPP19_MSQ       0x4
   52 #define ECP_MSQ         0x5
   53 
   54 /*
   55  * Device mode to submsq conversion
   56  */
   57 static struct ppb_xfer *
   58 mode2xfer(device_t bus, struct ppb_device *ppbdev, int opcode)
   59 {
   60         int index, epp, mode;
   61         struct ppb_xfer *table;
   62 
   63         switch (opcode) {
   64         case MS_OP_GET:
   65                 table = ppbdev->get_xfer;
   66                 break;
   67 
   68         case MS_OP_PUT:
   69                 table = ppbdev->put_xfer;
   70                 break;
   71 
   72         default:
   73                 panic("%s: unknown opcode (%d)", __func__, opcode);
   74         }
   75 
   76         /* retrieve the device operating mode */
   77         mode = ppb_get_mode(bus);
   78         switch (mode) {
   79         case PPB_COMPATIBLE:
   80                 index = COMPAT_MSQ;
   81                 break;
   82         case PPB_NIBBLE:
   83                 index = NIBBLE_MSQ;
   84                 break;
   85         case PPB_PS2:
   86                 index = PS2_MSQ;
   87                 break;
   88         case PPB_EPP:
   89                 switch ((epp = ppb_get_epp_protocol(bus))) {
   90                 case EPP_1_7:
   91                         index = EPP17_MSQ;
   92                         break;
   93                 case EPP_1_9:
   94                         index = EPP19_MSQ;
   95                         break;
   96                 default:
   97                         panic("%s: unknown EPP protocol (0x%x)!", __func__,
   98                                 epp);
   99                 }
  100                 break;
  101         case PPB_ECP:
  102                 index = ECP_MSQ;
  103                 break;
  104         default:
  105                 panic("%s: unknown mode (%d)", __func__, mode);
  106         }
  107 
  108         return (&table[index]);
  109 }
  110 
  111 /*
  112  * ppb_MS_init()
  113  *
  114  * Initialize device dependent submicrosequence of the current mode
  115  *
  116  */
  117 int
  118 ppb_MS_init(device_t bus, device_t dev, struct ppb_microseq *loop, int opcode)
  119 {
  120 #ifdef INVARIANTS
  121         struct ppb_data *ppb = device_get_softc(bus);
  122 #endif
  123         struct ppb_device *ppbdev = (struct ppb_device *)device_get_ivars(dev);
  124         struct ppb_xfer *xfer = mode2xfer(bus, ppbdev, opcode);
  125 
  126         mtx_assert(ppb->ppc_lock, MA_OWNED);
  127         xfer->loop = loop;
  128 
  129         return (0);
  130 }
  131 
  132 /*
  133  * ppb_MS_exec()
  134  *
  135  * Execute any microsequence opcode - expensive
  136  *
  137  */
  138 int
  139 ppb_MS_exec(device_t bus, device_t dev, int opcode, union ppb_insarg param1,
  140                 union ppb_insarg param2, union ppb_insarg param3, int *ret)
  141 {
  142         struct ppb_microseq msq[] = {
  143                   { MS_UNKNOWN, { { MS_UNKNOWN }, { MS_UNKNOWN }, { MS_UNKNOWN } } },
  144                   MS_RET(0)
  145         };
  146 
  147         /* initialize the corresponding microseq */
  148         msq[0].opcode = opcode;
  149         msq[0].arg[0] = param1;
  150         msq[0].arg[1] = param2;
  151         msq[0].arg[2] = param3;
  152 
  153         /* execute the microseq */
  154         return (ppb_MS_microseq(bus, dev, msq, ret));
  155 }
  156 
  157 /*
  158  * ppb_MS_loop()
  159  *
  160  * Execute a microseq loop
  161  *
  162  */
  163 int
  164 ppb_MS_loop(device_t bus, device_t dev, struct ppb_microseq *prolog,
  165                 struct ppb_microseq *body, struct ppb_microseq *epilog,
  166                 int iter, int *ret)
  167 {
  168         struct ppb_microseq loop_microseq[] = {
  169                   MS_CALL(0),                   /* execute prolog */
  170 
  171                   MS_SET(MS_UNKNOWN),           /* set size of transfer */
  172         /* loop: */
  173                   MS_CALL(0),                   /* execute body */
  174                   MS_DBRA(-1 /* loop: */),
  175 
  176                   MS_CALL(0),                   /* execute epilog */
  177                   MS_RET(0)
  178         };
  179 
  180         /* initialize the structure */
  181         loop_microseq[0].arg[0].p = (void *)prolog;
  182         loop_microseq[1].arg[0].i = iter;
  183         loop_microseq[2].arg[0].p = (void *)body;
  184         loop_microseq[4].arg[0].p = (void *)epilog;
  185 
  186         /* execute the loop */
  187         return (ppb_MS_microseq(bus, dev, loop_microseq, ret));
  188 }
  189 
  190 /*
  191  * ppb_MS_init_msq()
  192  *
  193  * Initialize a microsequence - see macros in ppb_msq.h
  194  *
  195  */
  196 int
  197 ppb_MS_init_msq(struct ppb_microseq *msq, int nbparam, ...)
  198 {
  199         int i;
  200         int param, ins, arg, type;
  201         va_list p_list;
  202 
  203         va_start(p_list, nbparam);
  204 
  205         for (i=0; i<nbparam; i++) {
  206                 /* retrieve the parameter descriptor */
  207                 param = va_arg(p_list, int);
  208 
  209                 ins  = MS_INS(param);
  210                 arg  = MS_ARG(param);
  211                 type = MS_TYP(param);
  212 
  213                 /* check the instruction position */
  214                 if (arg >= PPB_MS_MAXARGS)
  215                         panic("%s: parameter out of range (0x%x)!",
  216                                 __func__, param);
  217 
  218 #if 0
  219                 printf("%s: param = %d, ins = %d, arg = %d, type = %d\n",
  220                         __func__, param, ins, arg, type);
  221 #endif
  222 
  223                 /* properly cast the parameter */
  224                 switch (type) {
  225                 case MS_TYP_INT:
  226                         msq[ins].arg[arg].i = va_arg(p_list, int);
  227                         break;
  228 
  229                 case MS_TYP_CHA:
  230                         msq[ins].arg[arg].i = (int)va_arg(p_list, int);
  231                         break;
  232 
  233                 case MS_TYP_PTR:
  234                         msq[ins].arg[arg].p = va_arg(p_list, void *);
  235                         break;
  236 
  237                 case MS_TYP_FUN:
  238                         msq[ins].arg[arg].f = va_arg(p_list, void *);
  239                         break;
  240 
  241                 default:
  242                         panic("%s: unknown parameter (0x%x)!", __func__,
  243                                 param);
  244                 }
  245         }
  246 
  247         va_end(p_list);
  248         return (0);
  249 }
  250 
  251 /*
  252  * ppb_MS_microseq()
  253  *
  254  * Interprete a microsequence. Some microinstructions are executed at adapter
  255  * level to avoid function call overhead between ppbus and the adapter
  256  */
  257 int
  258 ppb_MS_microseq(device_t bus, device_t dev, struct ppb_microseq *msq, int *ret)
  259 {
  260         struct ppb_data *ppb = (struct ppb_data *)device_get_softc(bus);
  261         struct ppb_device *ppbdev = (struct ppb_device *)device_get_ivars(dev);
  262 
  263         struct ppb_microseq *mi;                /* current microinstruction */
  264         int error;
  265 
  266         struct ppb_xfer *xfer;
  267 
  268         /* microsequence executed to initialize the transfer */
  269         struct ppb_microseq initxfer[] = {
  270                 MS_PTR(MS_UNKNOWN),     /* set ptr to buffer */
  271                 MS_SET(MS_UNKNOWN),     /* set transfer size */
  272                 MS_RET(0)
  273         };
  274 
  275         mtx_assert(ppb->ppc_lock, MA_OWNED);
  276         if (ppb->ppb_owner != dev)
  277                 return (EACCES);
  278 
  279 #define INCR_PC (mi ++)
  280 
  281         mi = msq;
  282         for (;;) {
  283                 switch (mi->opcode) {
  284                 case MS_OP_PUT:
  285                 case MS_OP_GET:
  286 
  287                         /* attempt to choose the best mode for the device */
  288                         xfer = mode2xfer(bus, ppbdev, mi->opcode);
  289 
  290                         /* figure out if we should use ieee1284 code */
  291                         if (!xfer->loop) {
  292                                 if (mi->opcode == MS_OP_PUT) {
  293                                         if ((error = PPBUS_WRITE(
  294                                                 device_get_parent(bus),
  295                                                 (char *)mi->arg[0].p,
  296                                                 mi->arg[1].i, 0)))
  297                                                         goto error;
  298 
  299                                         INCR_PC;
  300                                         goto next;
  301                                 } else
  302                                         panic("%s: IEEE1284 read not supported", __func__);
  303                         }
  304 
  305                         /* XXX should use ppb_MS_init_msq() */
  306                         initxfer[0].arg[0].p = mi->arg[0].p;
  307                         initxfer[1].arg[0].i = mi->arg[1].i;
  308 
  309                         /* initialize transfer */
  310                         ppb_MS_microseq(bus, dev, initxfer, &error);
  311 
  312                         if (error)
  313                                 goto error;
  314 
  315                         /* the xfer microsequence should not contain any
  316                          * MS_OP_PUT or MS_OP_GET!
  317                          */
  318                         ppb_MS_microseq(bus, dev, xfer->loop, &error);
  319 
  320                         if (error)
  321                                 goto error;
  322 
  323                         INCR_PC;
  324                         break;
  325 
  326                 case MS_OP_RET:
  327                         if (ret)
  328                                 *ret = mi->arg[0].i;    /* return code */
  329                         return (0);
  330 
  331                 default:
  332                         /* executing microinstructions at ppc level is
  333                          * faster. This is the default if the microinstr
  334                          * is unknown here
  335                          */
  336                         if ((error = PPBUS_EXEC_MICROSEQ(
  337                                                 device_get_parent(bus), &mi)))
  338                                 goto error;
  339                         break;
  340                 }
  341         next:
  342                 continue;
  343         }
  344 error:
  345         return (error);
  346 }
  347
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FreeBSD/Linux Kernel Cross Reference sys/dev/ppbus/ppb_msq.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/ppb_msq.c
