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

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    1 /*
    2  * Copyright (c) 1996, Sujal M. Patel
    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/isa/pnp.c,v 1.5.2.1 2002/10/14 09:31:09 nyan Exp $
   27  *      from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
   28  */
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/bus.h>
   35 #include <sys/malloc.h>
   36 #include <isa/isavar.h>
   37 #include <isa/pnpreg.h>
   38 #include <isa/pnpvar.h>
   39 #include <machine/clock.h>
   40 
   41 typedef struct _pnp_id {
   42         u_int32_t vendor_id;
   43         u_int32_t serial;
   44         u_char checksum;
   45 } pnp_id;
   46 
   47 struct pnp_set_config_arg {
   48         int     csn;            /* Card number to configure */
   49         int     ldn;            /* Logical device on card */
   50 };
   51 
   52 struct pnp_quirk {
   53         u_int32_t vendor_id;    /* Vendor of the card */
   54         u_int32_t logical_id;   /* ID of the device with quirk */
   55         int     type;
   56 #define PNP_QUIRK_WRITE_REG     1 /* Need to write a pnp register  */
   57         int     arg1;
   58         int     arg2;
   59 };
   60 
   61 struct pnp_quirk pnp_quirks[] = {
   62         /*
   63          * The Gravis UltraSound needs register 0xf2 to be set to 0xff
   64          * to enable power.
   65          * XXX need to know the logical device id.
   66          */
   67         { 0x0100561e /* GRV0001 */,     0,
   68           PNP_QUIRK_WRITE_REG,  0xf2,    0xff },
   69 
   70         { 0 }
   71 };
   72 
   73 #ifdef PC98
   74 /* Some NEC PnP cards have 9 bytes serial code. */
   75 static pnp_id necids[] = {
   76         {0x4180a3b8, 0xffffffff, 0x00}, /* PC-9801CB-B04 (NEC8041) */
   77         {0x5181a3b8, 0xffffffff, 0x46}, /* PC-9821CB2-B04(NEC8151) */
   78         {0x5182a3b8, 0xffffffff, 0xb8}, /* PC-9801-XX    (NEC8251) */
   79         {0x9181a3b8, 0xffffffff, 0x00}, /* PC-9801-120   (NEC8191) */
   80         {0, 0, 0}
   81 };
   82 #endif
   83 
   84 #if 0
   85 /*
   86  * these entries are initialized using the autoconfig menu
   87  * The struct is invalid (and must be initialized) if the first
   88  * CSN is zero. The init code fills invalid entries with CSN 255
   89  * which is not a supported value.
   90  */
   91 
   92 struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = {
   93     { 0 }
   94 };
   95 #endif
   96 
   97 /* The READ_DATA port that we are using currently */
   98 static int pnp_rd_port;
   99 
  100 static void   pnp_send_initiation_key(void);
  101 static int    pnp_get_serial(pnp_id *p);
  102 static int    pnp_isolation_protocol(device_t parent);
  103 
  104 char *
  105 pnp_eisaformat(u_int32_t id)
  106 {
  107         u_int8_t *data = (u_int8_t *) &id;
  108         static char idbuf[8];
  109         const char  hextoascii[] = "0123456789abcdef";
  110 
  111         idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
  112         idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
  113         idbuf[2] = '@' + (data[1] & 0x1f);
  114         idbuf[3] = hextoascii[(data[2] >> 4)];
  115         idbuf[4] = hextoascii[(data[2] & 0xf)];
  116         idbuf[5] = hextoascii[(data[3] >> 4)];
  117         idbuf[6] = hextoascii[(data[3] & 0xf)];
  118         idbuf[7] = 0;
  119         return(idbuf);
  120 }
  121 
  122 static void
  123 pnp_write(int d, u_char r)
  124 {
  125         outb (_PNP_ADDRESS, d);
  126         outb (_PNP_WRITE_DATA, r);
  127 }
  128 
  129 #if 0
  130 
  131 static u_char
  132 pnp_read(int d)
  133 {
  134         outb (_PNP_ADDRESS, d);
  135         return (inb(3 | (pnp_rd_port <<2)));
  136 }
  137 
  138 #endif
  139 
  140 /*
  141  * Send Initiation LFSR as described in "Plug and Play ISA Specification",
  142  * Intel May 94.
  143  */
  144 static void
  145 pnp_send_initiation_key()
  146 {
  147         int cur, i;
  148 
  149         /* Reset the LSFR */
  150         outb(_PNP_ADDRESS, 0);
  151         outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
  152 
  153         cur = 0x6a;
  154         outb(_PNP_ADDRESS, cur);
  155 
  156         for (i = 1; i < 32; i++) {
  157                 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
  158                 outb(_PNP_ADDRESS, cur);
  159         }
  160 }
  161 
  162 
  163 /*
  164  * Get the device's serial number.  Returns 1 if the serial is valid.
  165  */
  166 static int
  167 pnp_get_serial(pnp_id *p)
  168 {
  169         int i, bit, valid = 0, sum = 0x6a;
  170         u_char *data = (u_char *)p;
  171 
  172         bzero(data, sizeof(char) * 9);
  173         outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  174         for (i = 0; i < 72; i++) {
  175                 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
  176                 DELAY(250);     /* Delay 250 usec */
  177 
  178                 /* Can't Short Circuit the next evaluation, so 'and' is last */
  179                 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
  180                 DELAY(250);     /* Delay 250 usec */
  181 
  182                 valid = valid || bit;
  183 
  184                 if (i < 64)
  185                         sum = (sum >> 1) |
  186                                 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
  187 
  188                 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
  189         }
  190 
  191         valid = valid && (data[8] == sum);
  192 
  193         return valid;
  194 }
  195 
  196 /*
  197  * Fill's the buffer with resource info from the device.
  198  * Returns the number of characters read.
  199  */
  200 static int
  201 pnp_get_resource_info(u_char *buffer, int len)
  202 {
  203         int i, j, count;
  204         u_char temp;
  205 
  206         count = 0;
  207         for (i = 0; i < len; i++) {
  208                 outb(_PNP_ADDRESS, PNP_STATUS);
  209                 for (j = 0; j < 100; j++) {
  210                         if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
  211                                 break;
  212                         DELAY(1);
  213                 }
  214                 if (j == 100) {
  215                         printf("PnP device failed to report resource data\n");
  216                         return count;
  217                 }
  218                 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
  219                 temp = inb((pnp_rd_port << 2) | 0x3);
  220                 if (buffer != NULL)
  221                         buffer[i] = temp;
  222                 count++;
  223         }
  224         return count;
  225 }
  226 
  227 #if 0
  228 /*
  229  * write_pnp_parms initializes a logical device with the parms
  230  * in d, and then activates the board if the last parameter is 1.
  231  */
  232 
  233 static int
  234 write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn)
  235 {
  236     int i, empty = -1 ;
  237 
  238     pnp_write (SET_LDN, ldn );
  239     i = pnp_read(SET_LDN) ;
  240     if (i != ldn) {
  241         printf("Warning: LDN %d does not exist\n", ldn);
  242     }
  243     for (i = 0; i < 8; i++) {
  244         pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 );
  245         pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff );
  246     }
  247     for (i = 0; i < 4; i++) {
  248         pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff );
  249         pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff );
  250         pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff );
  251         pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff );
  252         pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff );
  253     }
  254     for (i = 0; i < 2; i++) {
  255         pnp_write(IRQ_CONFIG + i*2    , d->irq[i] );
  256         pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] );
  257         pnp_write(DRQ_CONFIG + i, d->drq[i] );
  258     }
  259     /*
  260      * store parameters read into the current kernel
  261      * so manual editing next time is easier
  262      */
  263     for (i = 0 ; i < MAX_PNP_LDN; i++) {
  264         if (pnp_ldn_overrides[i].csn == d->csn &&
  265                 pnp_ldn_overrides[i].ldn == ldn) {
  266             d->flags = pnp_ldn_overrides[i].flags ;
  267             pnp_ldn_overrides[i] = *d ;
  268             break ;
  269         } else if (pnp_ldn_overrides[i].csn < 1 ||
  270                 pnp_ldn_overrides[i].csn == 255)
  271             empty = i ;
  272     }
  273     if (i== MAX_PNP_LDN && empty != -1)
  274         pnp_ldn_overrides[empty] = *d;
  275 
  276     /*
  277      * Here should really perform the range check, and
  278      * return a failure if not successful.
  279      */
  280     pnp_write (IO_RANGE_CHECK, 0);
  281     DELAY(1000); /* XXX is it really necessary ? */
  282     pnp_write (ACTIVATE, d->enable ? 1 : 0);
  283     DELAY(1000); /* XXX is it really necessary ? */
  284     return 1 ;
  285 }
  286 #endif
  287 
  288 /*
  289  * This function is called after the bus has assigned resource
  290  * locations for a logical device.
  291  */
  292 static void
  293 pnp_set_config(void *arg, struct isa_config *config, int enable)
  294 {
  295         int csn = ((struct pnp_set_config_arg *) arg)->csn;
  296         int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
  297         int i;
  298 
  299         /*
  300          * First put all cards into Sleep state with the initiation
  301          * key, then put our card into Config state.
  302          */
  303         pnp_send_initiation_key();
  304         pnp_write(PNP_WAKE, csn);
  305 
  306         /*
  307          * Select our logical device so that we can program it.
  308          */
  309         pnp_write(PNP_SET_LDN, ldn);
  310 
  311         /*
  312          * Now program the resources.
  313          */
  314         for (i = 0; i < config->ic_nmem; i++) {
  315                 u_int32_t start = config->ic_mem[i].ir_start;
  316                 u_int32_t size =  config->ic_mem[i].ir_size;
  317                 if (start & 0xff)
  318                         panic("pnp_set_config: bogus memory assignment");
  319                 pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
  320                 pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
  321                 pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
  322                 pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
  323         }
  324         for (; i < ISA_NMEM; i++) {
  325                 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
  326                 pnp_write(PNP_MEM_BASE_LOW(i), 0);
  327                 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
  328                 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
  329         }
  330 
  331         for (i = 0; i < config->ic_nport; i++) {
  332                 u_int32_t start = config->ic_port[i].ir_start;
  333                 pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
  334                 pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
  335         }
  336         for (; i < ISA_NPORT; i++) {
  337                 pnp_write(PNP_IO_BASE_HIGH(i), 0);
  338                 pnp_write(PNP_IO_BASE_LOW(i), 0);
  339         }
  340 
  341         for (i = 0; i < config->ic_nirq; i++) {
  342                 int irq = ffs(config->ic_irqmask[i]) - 1;
  343                 pnp_write(PNP_IRQ_LEVEL(i), irq);
  344                 pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
  345         }
  346         for (; i < ISA_NIRQ; i++) {
  347                 /*
  348                  * IRQ 0 is not a valid interrupt selection and
  349                  * represents no interrupt selection.
  350                  */
  351                 pnp_write(PNP_IRQ_LEVEL(i), 0);
  352         }               
  353 
  354         for (i = 0; i < config->ic_ndrq; i++) {
  355                 int drq = ffs(config->ic_drqmask[i]) - 1;
  356                 pnp_write(PNP_DMA_CHANNEL(i), drq);
  357         }
  358         for (; i < ISA_NDRQ; i++) {
  359                 /*
  360                  * DMA channel 4, the cascade channel is used to
  361                  * indicate no DMA channel is active.
  362                  */
  363                 pnp_write(PNP_DMA_CHANNEL(i), 4);
  364         }               
  365 
  366         pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
  367 
  368         /*
  369          * Wake everyone up again, we are finished.
  370          */
  371         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  372 }
  373 
  374 /*
  375  * Process quirks for a logical device.. The card must be in Config state.
  376  */
  377 static void
  378 pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn)
  379 {
  380         struct pnp_quirk *qp;
  381 
  382         for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
  383                 if (qp->vendor_id == vendor_id
  384                     && (qp->logical_id == 0
  385                         || qp->logical_id == logical_id)) {
  386                         switch (qp->type) {
  387                         case PNP_QUIRK_WRITE_REG:
  388                                 pnp_write(PNP_SET_LDN, ldn);
  389                                 pnp_write(qp->arg1, qp->arg2);
  390                                 break;
  391                         }
  392                 }
  393         }
  394 }
  395 
  396 /*
  397  * Scan Resource Data for Logical Devices.
  398  *
  399  * This function exits as soon as it gets an error reading *ANY*
  400  * Resource Data or it reaches the end of Resource Data.  In the first
  401  * case the return value will be TRUE, FALSE otherwise.
  402  */
  403 static int
  404 pnp_create_devices(device_t parent, pnp_id *p, int csn,
  405                    u_char *resources, int len)
  406 {
  407         u_char tag, *resp, *resinfo, *startres = 0;
  408         int large_len, scanning = len, retval = FALSE;
  409         u_int32_t logical_id;
  410         u_int32_t compat_id;
  411         device_t dev = 0;
  412         int ldn = 0;
  413         struct pnp_set_config_arg *csnldn;
  414         char buf[100];
  415         char *desc = 0;
  416 
  417         resp = resources;
  418         while (scanning > 0) {
  419                 tag = *resp++;
  420                 scanning--;
  421                 if (PNP_RES_TYPE(tag) != 0) {
  422                         /* Large resource */
  423                         if (scanning < 2) {
  424                                 scanning = 0;
  425                                 continue;
  426                         }
  427                         large_len = resp[0] + (resp[1] << 8);
  428                         resp += 2;
  429 
  430                         if (scanning < large_len) {
  431                                 scanning = 0;
  432                                 continue;
  433                         }
  434                         resinfo = resp;
  435                         resp += large_len;
  436                         scanning -= large_len;
  437 
  438                         if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
  439                                 if (large_len > sizeof(buf) - 1)
  440                                         large_len = sizeof(buf) - 1;
  441                                 bcopy(resinfo, buf, large_len);
  442 
  443                                 /*
  444                                  * Trim trailing spaces.
  445                                  */
  446                                 while (buf[large_len-1] == ' ')
  447                                         large_len--;
  448                                 buf[large_len] = '\0';
  449                                 desc = buf;
  450                                 if (dev)
  451                                         device_set_desc_copy(dev, desc);
  452                                 continue;
  453                         }
  454 
  455                         continue;
  456                 }
  457                 
  458                 /* Small resource */
  459                 if (scanning < PNP_SRES_LEN(tag)) {
  460                         scanning = 0;
  461                         continue;
  462                 }
  463                 resinfo = resp;
  464                 resp += PNP_SRES_LEN(tag);
  465                 scanning -= PNP_SRES_LEN(tag);;
  466                         
  467                 switch (PNP_SRES_NUM(tag)) {
  468                 case PNP_TAG_LOGICAL_DEVICE:
  469                         /*
  470                          * Parse the resources for the previous
  471                          * logical device (if any).
  472                          */
  473                         if (startres) {
  474                                 pnp_parse_resources(dev, startres,
  475                                                     resinfo - startres - 1);
  476                                 dev = 0;
  477                                 startres = 0;
  478                         }
  479 
  480                         /* 
  481                          * A new logical device. Scan for end of
  482                          * resources.
  483                          */
  484                         bcopy(resinfo, &logical_id, 4);
  485                         pnp_check_quirks(p->vendor_id, logical_id, ldn);
  486                         compat_id = 0;
  487                         dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
  488                         if (desc)
  489                                 device_set_desc_copy(dev, desc);
  490                         isa_set_vendorid(dev, p->vendor_id);
  491                         isa_set_serial(dev, p->serial);
  492                         isa_set_logicalid(dev, logical_id);
  493                         csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
  494                         if (!csnldn) {
  495                                 device_printf(parent,
  496                                               "out of memory\n");
  497                                 scanning = 0;
  498                                 break;
  499                         }
  500                         csnldn->csn = csn;
  501                         csnldn->ldn = ldn;
  502                         ISA_SET_CONFIG_CALLBACK(parent, dev,
  503                                                 pnp_set_config, csnldn);
  504                         ldn++;
  505                         startres = resp;
  506                         break;
  507                     
  508                 case PNP_TAG_END:
  509                         if (!startres) {
  510                                 device_printf(parent,
  511                                               "malformed resources\n");
  512                                 scanning = 0;
  513                                 break;
  514                         }
  515                         pnp_parse_resources(dev, startres,
  516                                             resinfo - startres - 1);
  517                         dev = 0;
  518                         startres = 0;
  519                         scanning = 0;
  520                         break;
  521 
  522                 default:
  523                         /* Skip this resource */
  524                         break;
  525                 }
  526         }
  527 
  528         return retval;
  529 }
  530 
  531 /*
  532  * Read 'amount' bytes of resources from the card, allocating memory
  533  * as needed. If a buffer is already available, it should be passed in
  534  * '*resourcesp' and its length in '*spacep'. The number of resource
  535  * bytes already in the buffer should be passed in '*lenp'. The memory
  536  * allocated will be returned in '*resourcesp' with its size and the
  537  * number of bytes of resources in '*spacep' and '*lenp' respectively.
  538  */
  539 static int
  540 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
  541 {
  542         u_char *resources = *resourcesp;
  543         u_char *newres;
  544         int space = *spacep;
  545         int len = *lenp;
  546 
  547         if (space == 0) {
  548                 space = 1024;
  549                 resources = malloc(space, M_TEMP, M_NOWAIT);
  550                 if (!resources)
  551                         return ENOMEM;
  552         }
  553         
  554         if (len + amount > space) {
  555                 int extra = 1024;
  556                 while (len + amount > space + extra)
  557                         extra += 1024;
  558                 newres = malloc(space + extra, M_TEMP, M_NOWAIT);
  559                 if (!newres)
  560                         return ENOMEM;
  561                 bcopy(resources, newres, len);
  562                 free(resources, M_TEMP);
  563                 resources = newres;
  564                 space += extra;
  565         }
  566 
  567         if (pnp_get_resource_info(resources + len, amount) != amount)
  568                 return EINVAL;
  569         len += amount;
  570 
  571         *resourcesp = resources;
  572         *spacep = space;
  573         *lenp = len;
  574 
  575         return 0;
  576 }
  577 
  578 /*
  579  * Read all resources from the card, allocating memory as needed. If a
  580  * buffer is already available, it should be passed in '*resourcesp'
  581  * and its length in '*spacep'. The memory allocated will be returned
  582  * in '*resourcesp' with its size and the number of bytes of resources
  583  * in '*spacep' and '*lenp' respectively.
  584  */
  585 static int
  586 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
  587 {
  588         u_char *resources = *resourcesp;
  589         int space = *spacep;
  590         int len = 0;
  591         int error, done;
  592         u_char tag;
  593 
  594         error = 0;
  595         done = 0;
  596         while (!done) {
  597                 error = pnp_read_bytes(1, &resources, &space, &len);
  598                 if (error)
  599                         goto out;
  600                 tag = resources[len-1];
  601                 if (PNP_RES_TYPE(tag) == 0) {
  602                         /*
  603                          * Small resource, read contents.
  604                          */
  605                         error = pnp_read_bytes(PNP_SRES_LEN(tag),
  606                                                &resources, &space, &len);
  607                         if (error)
  608                                 goto out;
  609                         if (PNP_SRES_NUM(tag) == PNP_TAG_END)
  610                                 done = 1;
  611                 } else {
  612                         /*
  613                          * Large resource, read length and contents.
  614                          */
  615                         error = pnp_read_bytes(2, &resources, &space, &len);
  616                         if (error)
  617                                 goto out;
  618                         error = pnp_read_bytes(resources[len-2]
  619                                                + (resources[len-1] << 8),
  620                                                &resources, &space, &len);
  621                         if (error)
  622                                 goto out;
  623                 }
  624         }
  625 
  626  out:
  627         *resourcesp = resources;
  628         *spacep = space;
  629         *lenp = len;
  630         return error;
  631 }
  632 
  633 /*
  634  * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
  635  * value (caller should try multiple READ_DATA locations before giving
  636  * up). Upon exiting, all cards are aware that they should use
  637  * pnp_rd_port as the READ_DATA port.
  638  *
  639  * In the first pass, a csn is assigned to each board and pnp_id's
  640  * are saved to an array, pnp_devices. In the second pass, each
  641  * card is woken up and the device configuration is called.
  642  */
  643 static int
  644 pnp_isolation_protocol(device_t parent)
  645 {
  646         int csn;
  647         pnp_id id;
  648         int found = 0, len;
  649         u_char *resources = 0;
  650         int space = 0;
  651         int error;
  652 #ifdef PC98
  653         int n, necpnp;
  654         u_char buffer[10];
  655 #endif
  656 
  657         /*
  658          * Put all cards into the Sleep state so that we can clear
  659          * their CSNs.
  660          */
  661         pnp_send_initiation_key();
  662 
  663         /*
  664          * Clear the CSN for all cards.
  665          */
  666         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
  667 
  668         /*
  669          * Move all cards to the Isolation state.
  670          */
  671         pnp_write(PNP_WAKE, 0);
  672 
  673         /*
  674          * Tell them where the read point is going to be this time.
  675          */
  676         pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
  677 
  678         for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
  679                 /*
  680                  * Start the serial isolation protocol.
  681                  */
  682                 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  683                 DELAY(1000);    /* Delay 1 msec */
  684 
  685                 if (pnp_get_serial(&id)) {
  686                         /*
  687                          * We have read the id from a card
  688                          * successfully. The card which won the
  689                          * isolation protocol will be in Isolation
  690                          * mode and all others will be in Sleep.
  691                          * Program the CSN of the isolated card
  692                          * (taking it to Config state) and read its
  693                          * resources, creating devices as we find
  694                          * logical devices on the card.
  695                          */
  696                         pnp_write(PNP_SET_CSN, csn);
  697 #ifdef PC98
  698                         if (bootverbose)
  699                                 printf("PnP Vendor ID = %x\n", id.vendor_id);
  700                         /* Check for NEC PnP (9 bytes serial). */
  701                         for (n = necpnp = 0; necids[n].vendor_id; n++) {
  702                                 if (id.vendor_id == necids[n].vendor_id) {
  703                                         necpnp = 1;
  704                                         break;
  705                                 }
  706                         }
  707                         if (necpnp) {
  708                                 if (bootverbose)
  709                                         printf("It seems to NEC-PnP card (%s).\n",
  710                                                pnp_eisaformat(id.vendor_id));
  711                                 /*  Read dummy 9 bytes serial area. */
  712                                 pnp_get_resource_info(buffer, 9);
  713                         } else {
  714                                 if (bootverbose)
  715                                         printf("It seems to Normal-ISA-PnP card (%s).\n",
  716                                                pnp_eisaformat(id.vendor_id));
  717                         }
  718                         if (bootverbose)
  719                                 printf("Reading PnP configuration for %s.\n",
  720                                        pnp_eisaformat(id.vendor_id));
  721 #endif
  722                         error = pnp_read_resources(&resources,
  723                                                    &space,
  724                                                    &len);
  725                         if (error)
  726                                 break;
  727                         pnp_create_devices(parent, &id, csn,
  728                                            resources, len);
  729                         found++;
  730                 } else
  731                         break;
  732 
  733                 /*
  734                  * Put this card back to the Sleep state and
  735                  * simultaneously move all cards which don't have a
  736                  * CSN yet to Isolation state.
  737                  */
  738                 pnp_write(PNP_WAKE, 0);
  739         }
  740 
  741         /*
  742          * Unless we have chosen the wrong read port, all cards will
  743          * be in Sleep state. Put them back into WaitForKey for
  744          * now. Their resources will be programmed later.
  745          */
  746         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  747 
  748         /*
  749          * Cleanup.
  750          */
  751         if (resources)
  752                 free(resources, M_TEMP);
  753 
  754         return found;
  755 }
  756 
  757 
  758 /*
  759  * pnp_identify()
  760  *
  761  * autoconfiguration of pnp devices. This routine just runs the
  762  * isolation protocol over several ports, until one is successful.
  763  *
  764  * may be called more than once ?
  765  *
  766  */
  767 
  768 static void
  769 pnp_identify(driver_t *driver, device_t parent)
  770 {
  771         int num_pnp_devs;
  772 
  773 #if 0
  774         if (pnp_ldn_overrides[0].csn == 0) {
  775                 if (bootverbose)
  776                         printf("Initializing PnP override table\n");
  777                 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides));
  778                 pnp_ldn_overrides[0].csn = 255 ;
  779         }
  780 #endif
  781 
  782         /* Try various READ_DATA ports from 0x203-0x3ff */
  783         for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
  784                 if (bootverbose)
  785                         printf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3);
  786 
  787                 num_pnp_devs = pnp_isolation_protocol(parent);
  788                 if (num_pnp_devs)
  789                         break;
  790         }
  791 }
  792 
  793 static device_method_t pnp_methods[] = {
  794         /* Device interface */
  795         DEVMETHOD(device_identify,      pnp_identify),
  796 
  797         { 0, 0 }
  798 };
  799 
  800 static driver_t pnp_driver = {
  801         "pnp",
  802         pnp_methods,
  803         1,                      /* no softc */
  804 };
  805 
  806 static devclass_t pnp_devclass;
  807 
  808 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);

Cache object: e7e16291c0bfbd2a4f4dbe9367ca1115


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