The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/ppi.c

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    1 /*-
    2  * Copyright (c) 1997, 1998, 1999 Nicolas Souchu, Michael Smith
    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: releng/7.3/sys/dev/ppbus/ppi.c 166914 2007-02-23 19:34:52Z imp $");
   31 #include "opt_ppb_1284.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/module.h>
   36 #include <sys/bus.h>
   37 #include <sys/conf.h>
   38 #include <sys/kernel.h>
   39 #include <sys/uio.h>
   40 #include <sys/fcntl.h>
   41 
   42 #include <machine/bus.h>
   43 #include <machine/resource.h>
   44 #include <sys/rman.h>
   45 
   46 #include <dev/ppbus/ppbconf.h>
   47 #include <dev/ppbus/ppb_msq.h>
   48 
   49 #ifdef PERIPH_1284
   50 #include <dev/ppbus/ppb_1284.h>
   51 #endif
   52 
   53 #include <dev/ppbus/ppi.h>
   54 
   55 #include "ppbus_if.h"
   56 
   57 #include <dev/ppbus/ppbio.h>
   58 
   59 #define BUFSIZE         512
   60 
   61 struct ppi_data {
   62 
   63     int         ppi_unit;
   64     int         ppi_flags;
   65 #define HAVE_PPBUS      (1<<0)
   66 #define HAD_PPBUS       (1<<1)
   67 
   68     int         ppi_count;
   69     int         ppi_mode;                       /* IEEE1284 mode */
   70     char        ppi_buffer[BUFSIZE];
   71 
   72 #ifdef PERIPH_1284
   73     struct resource *intr_resource;     /* interrupt resource */
   74     void *intr_cookie;                  /* interrupt registration cookie */
   75 #endif /* PERIPH_1284 */
   76 };
   77 
   78 #define DEVTOSOFTC(dev) \
   79         ((struct ppi_data *)device_get_softc(dev))
   80 #define UNITOSOFTC(unit) \
   81         ((struct ppi_data *)devclass_get_softc(ppi_devclass, (unit)))
   82 #define UNITODEVICE(unit) \
   83         (devclass_get_device(ppi_devclass, (unit)))
   84 
   85 static devclass_t ppi_devclass;
   86 
   87 static  d_open_t        ppiopen;
   88 static  d_close_t       ppiclose;
   89 static  d_ioctl_t       ppiioctl;
   90 static  d_write_t       ppiwrite;
   91 static  d_read_t        ppiread;
   92 
   93 static struct cdevsw ppi_cdevsw = {
   94         .d_version =    D_VERSION,
   95         .d_flags =      D_NEEDGIANT,
   96         .d_open =       ppiopen,
   97         .d_close =      ppiclose,
   98         .d_read =       ppiread,
   99         .d_write =      ppiwrite,
  100         .d_ioctl =      ppiioctl,
  101         .d_name =       "ppi",
  102 };
  103 
  104 #ifdef PERIPH_1284
  105 
  106 static void
  107 ppi_enable_intr(device_t ppidev)
  108 {
  109         char r;
  110         device_t ppbus = device_get_parent(ppidev);
  111 
  112         r = ppb_rctr(ppbus);
  113         ppb_wctr(ppbus, r | IRQENABLE);
  114 
  115         return;
  116 }
  117 
  118 static void
  119 ppi_disable_intr(device_t ppidev)
  120 {
  121         char r;
  122         device_t ppbus = device_get_parent(ppidev);
  123 
  124         r = ppb_rctr(ppbus);
  125         ppb_wctr(ppbus, r & ~IRQENABLE);
  126 
  127         return;
  128 }
  129 
  130 #endif /* PERIPH_1284 */
  131 
  132 static void
  133 ppi_identify(driver_t *driver, device_t parent)
  134 {
  135 
  136         device_t dev;
  137 
  138         dev = device_find_child(parent, "ppi", -1);
  139         if (!dev)
  140                 BUS_ADD_CHILD(parent, 0, "ppi", -1);
  141 }
  142 
  143 /*
  144  * ppi_probe()
  145  */
  146 static int
  147 ppi_probe(device_t dev)
  148 {
  149         struct ppi_data *ppi;
  150 
  151         /* probe is always ok */
  152         device_set_desc(dev, "Parallel I/O");
  153 
  154         ppi = DEVTOSOFTC(dev);
  155 
  156         return (0);
  157 }
  158 
  159 /*
  160  * ppi_attach()
  161  */
  162 static int
  163 ppi_attach(device_t dev)
  164 {
  165 #ifdef PERIPH_1284
  166         uintptr_t irq;
  167         int zero = 0;
  168         struct ppi_data *ppi = DEVTOSOFTC(dev);
  169 
  170         /* retrive the irq */
  171         BUS_READ_IVAR(device_get_parent(dev), dev, PPBUS_IVAR_IRQ, &irq);
  172 
  173         /* declare our interrupt handler */
  174         ppi->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
  175                                                 &zero, irq, irq, 1, RF_ACTIVE);
  176 #endif /* PERIPH_1284 */
  177 
  178         make_dev(&ppi_cdevsw, device_get_unit(dev),     /* XXX cleanup */
  179                  UID_ROOT, GID_WHEEL,
  180                  0600, "ppi%d", device_get_unit(dev));
  181 
  182         return (0);
  183 }
  184 
  185 #ifdef PERIPH_1284
  186 /*
  187  * Cable
  188  * -----
  189  *
  190  * Use an IEEE1284 compliant (DB25/DB25) cable with the following tricks:
  191  *
  192  * nStrobe   <-> nAck           1  <-> 10
  193  * nAutofd   <-> Busy           11 <-> 14
  194  * nSelectin <-> Select         17 <-> 13
  195  * nInit     <-> nFault         15 <-> 16
  196  *
  197  */
  198 static void
  199 ppiintr(void *arg)
  200 {
  201         device_t ppidev = (device_t)arg;
  202         device_t ppbus = device_get_parent(ppidev);
  203         struct ppi_data *ppi = DEVTOSOFTC(ppidev);
  204 
  205         ppi_disable_intr(ppidev);
  206 
  207         switch (ppb_1284_get_state(ppbus)) {
  208 
  209         /* accept IEEE1284 negotiation then wakeup a waiting process to
  210          * continue negotiation at process level */
  211         case PPB_FORWARD_IDLE:
  212                 /* Event 1 */
  213                 if ((ppb_rstr(ppbus) & (SELECT | nBUSY)) ==
  214                                                         (SELECT | nBUSY)) {
  215                         /* IEEE1284 negotiation */
  216 #ifdef DEBUG_1284
  217                         printf("N");
  218 #endif
  219 
  220                         /* Event 2 - prepare for reading the ext. value */
  221                         ppb_wctr(ppbus, (PCD | STROBE | nINIT) & ~SELECTIN);
  222 
  223                         ppb_1284_set_state(ppbus, PPB_NEGOCIATION);
  224 
  225                 } else {
  226 #ifdef DEBUG_1284
  227                         printf("0x%x", ppb_rstr(ppbus));
  228 #endif
  229                         ppb_peripheral_terminate(ppbus, PPB_DONTWAIT);
  230                         break;
  231                 }
  232 
  233                 /* wake up any process waiting for negotiation from
  234                  * remote master host */
  235 
  236                 /* XXX should set a variable to warn the process about
  237                  * the interrupt */
  238 
  239                 wakeup(ppi);
  240                 break;
  241         default:
  242 #ifdef DEBUG_1284
  243                 printf("?%d", ppb_1284_get_state(ppbus));
  244 #endif
  245                 ppb_1284_set_state(ppbus, PPB_FORWARD_IDLE);
  246                 ppb_set_mode(ppbus, PPB_COMPATIBLE);
  247                 break;
  248         }
  249 
  250         ppi_enable_intr(ppidev);
  251 
  252         return;
  253 }
  254 #endif /* PERIPH_1284 */
  255 
  256 static int
  257 ppiopen(struct cdev *dev, int flags, int fmt, struct thread *td)
  258 {
  259         u_int unit = minor(dev);
  260         struct ppi_data *ppi = UNITOSOFTC(unit);
  261         device_t ppidev = UNITODEVICE(unit);
  262         device_t ppbus = device_get_parent(ppidev);
  263         int res;
  264 
  265         if (!ppi)
  266                 return (ENXIO);
  267 
  268         if (!(ppi->ppi_flags & HAVE_PPBUS)) {
  269                 if ((res = ppb_request_bus(ppbus, ppidev,
  270                         (flags & O_NONBLOCK) ? PPB_DONTWAIT :
  271                                                 (PPB_WAIT | PPB_INTR))))
  272                         return (res);
  273 
  274                 ppi->ppi_flags |= HAVE_PPBUS;
  275 
  276 #ifdef PERIPH_1284
  277                 if (ppi->intr_resource) {
  278                         /* register our interrupt handler */
  279                         bus_setup_intr(ppidev, ppi->intr_resource, 
  280                                        INTR_TYPE_TTY, NULL, ppiintr, dev,
  281                                        &ppi->intr_cookie);
  282                 }
  283 #endif /* PERIPH_1284 */
  284         }
  285         ppi->ppi_count += 1;
  286 
  287         return (0);
  288 }
  289 
  290 static int
  291 ppiclose(struct cdev *dev, int flags, int fmt, struct thread *td)
  292 {
  293         u_int unit = minor(dev);
  294         struct ppi_data *ppi = UNITOSOFTC(unit);
  295         device_t ppidev = UNITODEVICE(unit);
  296         device_t ppbus = device_get_parent(ppidev);
  297 
  298         ppi->ppi_count --;
  299         if (!ppi->ppi_count) {
  300 
  301 #ifdef PERIPH_1284
  302                 switch (ppb_1284_get_state(ppbus)) {
  303                 case PPB_PERIPHERAL_IDLE:
  304                         ppb_peripheral_terminate(ppbus, 0);
  305                         break;
  306                 case PPB_REVERSE_IDLE:
  307                 case PPB_EPP_IDLE:
  308                 case PPB_ECP_FORWARD_IDLE:
  309                 default:
  310                         ppb_1284_terminate(ppbus);
  311                         break;
  312                 }
  313 #endif /* PERIPH_1284 */
  314 
  315                 /* unregistration of interrupt forced by release */
  316                 ppb_release_bus(ppbus, ppidev);
  317 
  318                 ppi->ppi_flags &= ~HAVE_PPBUS;
  319         }
  320 
  321         return (0);
  322 }
  323 
  324 /*
  325  * ppiread()
  326  *
  327  * IEEE1284 compliant read.
  328  *
  329  * First, try negotiation to BYTE then NIBBLE mode
  330  * If no data is available, wait for it otherwise transfer as much as possible
  331  */
  332 static int
  333 ppiread(struct cdev *dev, struct uio *uio, int ioflag)
  334 {
  335 #ifdef PERIPH_1284
  336         u_int unit = minor(dev);
  337         struct ppi_data *ppi = UNITOSOFTC(unit);
  338         device_t ppidev = UNITODEVICE(unit);
  339         device_t ppbus = device_get_parent(ppidev);
  340         int len, error = 0;
  341 
  342         switch (ppb_1284_get_state(ppbus)) {
  343         case PPB_PERIPHERAL_IDLE:
  344                 ppb_peripheral_terminate(ppbus, 0);
  345                 /* FALLTHROUGH */
  346 
  347         case PPB_FORWARD_IDLE:
  348                 /* if can't negotiate NIBBLE mode then try BYTE mode,
  349                  * the peripheral may be a computer
  350                  */
  351                 if ((ppb_1284_negociate(ppbus,
  352                         ppi->ppi_mode = PPB_NIBBLE, 0))) {
  353 
  354                         /* XXX Wait 2 seconds to let the remote host some
  355                          * time to terminate its interrupt
  356                          */
  357                         tsleep(ppi, PPBPRI, "ppiread", 2*hz);
  358                         
  359                         if ((error = ppb_1284_negociate(ppbus,
  360                                 ppi->ppi_mode = PPB_BYTE, 0)))
  361                                 return (error);
  362                 }
  363                 break;
  364 
  365         case PPB_REVERSE_IDLE:
  366         case PPB_EPP_IDLE:
  367         case PPB_ECP_FORWARD_IDLE:
  368         default:
  369                 break;
  370         }
  371 
  372 #ifdef DEBUG_1284
  373         printf("N");
  374 #endif
  375         /* read data */
  376         len = 0;
  377         while (uio->uio_resid) {
  378                 if ((error = ppb_1284_read(ppbus, ppi->ppi_mode,
  379                         ppi->ppi_buffer, min(BUFSIZE, uio->uio_resid),
  380                         &len))) {
  381                         goto error;
  382                 }
  383 
  384                 if (!len)
  385                         goto error;             /* no more data */
  386 
  387 #ifdef DEBUG_1284
  388                 printf("d");
  389 #endif
  390                 if ((error = uiomove(ppi->ppi_buffer, len, uio)))
  391                         goto error;
  392         }
  393 
  394 error:
  395 
  396 #else /* PERIPH_1284 */
  397         int error = ENODEV;
  398 #endif
  399 
  400         return (error);
  401 }
  402 
  403 /*
  404  * ppiwrite()
  405  *
  406  * IEEE1284 compliant write
  407  *
  408  * Actually, this is the peripheral side of a remote IEEE1284 read
  409  *
  410  * The first part of the negotiation (IEEE1284 device detection) is
  411  * done at interrupt level, then the remaining is done by the writing
  412  * process
  413  *
  414  * Once negotiation done, transfer data
  415  */
  416 static int
  417 ppiwrite(struct cdev *dev, struct uio *uio, int ioflag)
  418 {
  419 #ifdef PERIPH_1284
  420         u_int unit = minor(dev);
  421         struct ppi_data *ppi = UNITOSOFTC(unit);
  422         device_t ppidev = UNITODEVICE(unit);
  423         device_t ppbus = device_get_parent(ppidev);
  424         int len, error = 0, sent;
  425 
  426 #if 0
  427         int ret;
  428 
  429         #define ADDRESS         MS_PARAM(0, 0, MS_TYP_PTR)
  430         #define LENGTH          MS_PARAM(0, 1, MS_TYP_INT)
  431 
  432         struct ppb_microseq msq[] = {
  433                   { MS_OP_PUT, { MS_UNKNOWN, MS_UNKNOWN, MS_UNKNOWN } },
  434                   MS_RET(0)
  435         };
  436 
  437         /* negotiate ECP mode */
  438         if (ppb_1284_negociate(ppbus, PPB_ECP, 0)) {
  439                 printf("ppiwrite: ECP negotiation failed\n");
  440         }
  441 
  442         while (!error && (len = min(uio->uio_resid, BUFSIZE))) {
  443                 uiomove(ppi->ppi_buffer, len, uio);
  444 
  445                 ppb_MS_init_msq(msq, 2, ADDRESS, ppi->ppi_buffer, LENGTH, len);
  446 
  447                 error = ppb_MS_microseq(ppbus, msq, &ret);
  448         }
  449 #endif
  450 
  451         /* we have to be peripheral to be able to send data, so
  452          * wait for the appropriate state
  453          */
  454         if (ppb_1284_get_state(ppbus) < PPB_PERIPHERAL_NEGOCIATION)
  455                 ppb_1284_terminate(ppbus);
  456 
  457         while (ppb_1284_get_state(ppbus) != PPB_PERIPHERAL_IDLE) {
  458                 /* XXX should check a variable before sleeping */
  459 #ifdef DEBUG_1284
  460                 printf("s");
  461 #endif
  462 
  463                 ppi_enable_intr(ppidev);
  464 
  465                 /* sleep until IEEE1284 negotiation starts */
  466                 error = tsleep(ppi, PCATCH | PPBPRI, "ppiwrite", 0);
  467 
  468                 switch (error) {
  469                 case 0:
  470                         /* negotiate peripheral side with BYTE mode */
  471                         ppb_peripheral_negociate(ppbus, PPB_BYTE, 0);
  472                         break;
  473                 case EWOULDBLOCK:
  474                         break;
  475                 default:
  476                         goto error;
  477                 }
  478         }
  479 #ifdef DEBUG_1284
  480         printf("N");
  481 #endif
  482 
  483         /* negotiation done, write bytes to master host */
  484         while ((len = min(uio->uio_resid, BUFSIZE)) != 0) {
  485                 uiomove(ppi->ppi_buffer, len, uio);
  486                 if ((error = byte_peripheral_write(ppbus,
  487                                                 ppi->ppi_buffer, len, &sent)))
  488                         goto error;
  489 #ifdef DEBUG_1284
  490                 printf("d");
  491 #endif
  492         }
  493 
  494 error:
  495 
  496 #else /* PERIPH_1284 */
  497         int error = ENODEV;
  498 #endif
  499 
  500         return (error);
  501 }
  502 
  503 static int
  504 ppiioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
  505 {
  506         u_int unit = minor(dev);
  507         device_t ppidev = UNITODEVICE(unit);
  508         device_t ppbus = device_get_parent(ppidev);
  509         int error = 0;
  510         u_int8_t *val = (u_int8_t *)data;
  511 
  512         switch (cmd) {
  513 
  514         case PPIGDATA:                  /* get data register */
  515                 *val = ppb_rdtr(ppbus);
  516                 break;
  517         case PPIGSTATUS:                /* get status bits */
  518                 *val = ppb_rstr(ppbus);
  519                 break;
  520         case PPIGCTRL:                  /* get control bits */
  521                 *val = ppb_rctr(ppbus);
  522                 break;
  523         case PPIGEPPD:                  /* get EPP data bits */
  524                 *val = ppb_repp_D(ppbus);
  525                 break;
  526         case PPIGECR:                   /* get ECP bits */
  527                 *val = ppb_recr(ppbus);
  528                 break;
  529         case PPIGFIFO:                  /* read FIFO */
  530                 *val = ppb_rfifo(ppbus);
  531                 break;
  532         case PPISDATA:                  /* set data register */
  533                 ppb_wdtr(ppbus, *val);
  534                 break;
  535         case PPISSTATUS:                /* set status bits */
  536                 ppb_wstr(ppbus, *val);
  537                 break;
  538         case PPISCTRL:                  /* set control bits */
  539                 ppb_wctr(ppbus, *val);
  540                 break;
  541         case PPISEPPD:                  /* set EPP data bits */
  542                 ppb_wepp_D(ppbus, *val);
  543                 break;
  544         case PPISECR:                   /* set ECP bits */
  545                 ppb_wecr(ppbus, *val);
  546                 break;
  547         case PPISFIFO:                  /* write FIFO */
  548                 ppb_wfifo(ppbus, *val);
  549                 break;
  550         case PPIGEPPA:                  /* get EPP address bits */
  551                 *val = ppb_repp_A(ppbus);
  552                 break;
  553         case PPISEPPA:                  /* set EPP address bits */
  554                 ppb_wepp_A(ppbus, *val);
  555                 break;
  556         default:
  557                 error = ENOTTY;
  558                 break;
  559         }
  560     
  561         return (error);
  562 }
  563 
  564 static device_method_t ppi_methods[] = {
  565         /* device interface */
  566         DEVMETHOD(device_identify,      ppi_identify),
  567         DEVMETHOD(device_probe,         ppi_probe),
  568         DEVMETHOD(device_attach,        ppi_attach),
  569 
  570         { 0, 0 }
  571 };
  572 
  573 static driver_t ppi_driver = {
  574         "ppi",
  575         ppi_methods,
  576         sizeof(struct ppi_data),
  577 };
  578 DRIVER_MODULE(ppi, ppbus, ppi_driver, ppi_devclass, 0, 0);
  579 MODULE_DEPEND(ppi, ppbus, 1, 1, 1);

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