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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1996, Sujal M. Patel
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  *      from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/12.0/sys/isa/pnp.c 327120 2017-12-23 22:57:14Z imp $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/bus.h>
   39 #include <sys/endian.h>
   40 #include <sys/malloc.h>
   41 #include <isa/isavar.h>
   42 #include <isa/pnpreg.h>
   43 #include <isa/pnpvar.h>
   44 #include <machine/bus.h>
   45 
   46 typedef struct _pnp_id {
   47         uint32_t vendor_id;
   48         uint32_t serial;
   49         u_char checksum;
   50 } pnp_id;
   51 
   52 struct pnp_set_config_arg {
   53         int     csn;            /* Card number to configure */
   54         int     ldn;            /* Logical device on card */
   55 };
   56 
   57 struct pnp_quirk {
   58         uint32_t vendor_id;     /* Vendor of the card */
   59         uint32_t logical_id;    /* ID of the device with quirk */
   60         int     type;
   61 #define PNP_QUIRK_WRITE_REG     1 /* Need to write a pnp register  */
   62 #define PNP_QUIRK_EXTRA_IO      2 /* Has extra io ports  */
   63         int     arg1;
   64         int     arg2;
   65 };
   66 
   67 struct pnp_quirk pnp_quirks[] = {
   68         /*
   69          * The Gravis UltraSound needs register 0xf2 to be set to 0xff
   70          * to enable power.
   71          * XXX need to know the logical device id.
   72          */
   73         { 0x0100561e /* GRV0001 */,     0,
   74           PNP_QUIRK_WRITE_REG,  0xf2,    0xff },
   75         /*
   76          * An emu8000 does not give us other than the first
   77          * port.
   78          */
   79         { 0x26008c0e /* SB16 */,        0x21008c0e,
   80           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   81         { 0x42008c0e /* SB32(CTL0042) */,       0x21008c0e,
   82           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   83         { 0x44008c0e /* SB32(CTL0044) */,       0x21008c0e,
   84           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   85         { 0x49008c0e /* SB32(CTL0049) */,       0x21008c0e,
   86           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   87         { 0xf1008c0e /* SB32(CTL00f1) */,       0x21008c0e,
   88           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   89         { 0xc1008c0e /* SB64(CTL00c1) */,       0x22008c0e,
   90           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   91         { 0xc5008c0e /* SB64(CTL00c5) */,       0x22008c0e,
   92           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   93         { 0xe4008c0e /* SB64(CTL00e4) */,       0x22008c0e,
   94           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   95 
   96         { 0 }
   97 };
   98 
   99 /* The READ_DATA port that we are using currently */
  100 static int pnp_rd_port;
  101 
  102 static void   pnp_send_initiation_key(void);
  103 static int    pnp_get_serial(pnp_id *p);
  104 static int    pnp_isolation_protocol(device_t parent);
  105 
  106 static void
  107 pnp_write(int d, u_char r)
  108 {
  109         outb (_PNP_ADDRESS, d);
  110         outb (_PNP_WRITE_DATA, r);
  111 }
  112 
  113 /*
  114  * Send Initiation LFSR as described in "Plug and Play ISA Specification",
  115  * Intel May 94.
  116  */
  117 static void
  118 pnp_send_initiation_key()
  119 {
  120         int cur, i;
  121 
  122         /* Reset the LSFR */
  123         outb(_PNP_ADDRESS, 0);
  124         outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
  125 
  126         cur = 0x6a;
  127         outb(_PNP_ADDRESS, cur);
  128 
  129         for (i = 1; i < 32; i++) {
  130                 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
  131                 outb(_PNP_ADDRESS, cur);
  132         }
  133 }
  134 
  135 
  136 /*
  137  * Get the device's serial number.  Returns 1 if the serial is valid.
  138  */
  139 static int
  140 pnp_get_serial(pnp_id *p)
  141 {
  142         int i, bit, valid = 0, sum = 0x6a;
  143         u_char *data = (u_char *)p;
  144 
  145         bzero(data, sizeof(char) * 9);
  146         outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  147         for (i = 0; i < 72; i++) {
  148                 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
  149                 DELAY(250);     /* Delay 250 usec */
  150 
  151                 /* Can't Short Circuit the next evaluation, so 'and' is last */
  152                 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
  153                 DELAY(250);     /* Delay 250 usec */
  154 
  155                 valid = valid || bit;
  156                 if (i < 64)
  157                         sum = (sum >> 1) |
  158                           (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
  159                 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
  160         }
  161 
  162         valid = valid && (data[8] == sum);
  163 
  164         return (valid);
  165 }
  166 
  167 /*
  168  * Fill's the buffer with resource info from the device.
  169  * Returns the number of characters read.
  170  */
  171 static int
  172 pnp_get_resource_info(u_char *buffer, int len)
  173 {
  174         int i, j, count;
  175         u_char temp;
  176 
  177         count = 0;
  178         for (i = 0; i < len; i++) {
  179                 outb(_PNP_ADDRESS, PNP_STATUS);
  180                 for (j = 0; j < 100; j++) {
  181                         if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
  182                                 break;
  183                         DELAY(10);
  184                 }
  185                 if (j == 100) {
  186                         printf("PnP device failed to report resource data\n");
  187                         return (count);
  188                 }
  189                 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
  190                 temp = inb((pnp_rd_port << 2) | 0x3);
  191                 if (buffer != NULL)
  192                         buffer[i] = temp;
  193                 count++;
  194         }
  195         return (count);
  196 }
  197 
  198 /*
  199  * This function is called after the bus has assigned resource
  200  * locations for a logical device.
  201  */
  202 static void
  203 pnp_set_config(void *arg, struct isa_config *config, int enable)
  204 {
  205         int csn = ((struct pnp_set_config_arg *) arg)->csn;
  206         int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
  207         int i;
  208 
  209         /*
  210          * First put all cards into Sleep state with the initiation
  211          * key, then put our card into Config state.
  212          */
  213         pnp_send_initiation_key();
  214         pnp_write(PNP_WAKE, csn);
  215 
  216         /*
  217          * Select our logical device so that we can program it.
  218          */
  219         pnp_write(PNP_SET_LDN, ldn);
  220 
  221         /*
  222          * Constrain the number of resources we will try to program
  223          */
  224         if (config->ic_nmem > ISA_PNP_NMEM) {
  225                 printf("too many ISA memory ranges (%d > %d)\n",
  226                     config->ic_nmem, ISA_PNP_NMEM);
  227                 config->ic_nmem = ISA_PNP_NMEM;
  228         }
  229         if (config->ic_nport > ISA_PNP_NPORT) {
  230                 printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport,
  231                     ISA_PNP_NPORT);
  232                 config->ic_nport = ISA_PNP_NPORT;
  233         }
  234         if (config->ic_nirq > ISA_PNP_NIRQ) {
  235                 printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq,
  236                     ISA_PNP_NIRQ);
  237                 config->ic_nirq = ISA_PNP_NIRQ;
  238         }
  239         if (config->ic_ndrq > ISA_PNP_NDRQ) {
  240                 printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq,
  241                     ISA_PNP_NDRQ);
  242                 config->ic_ndrq = ISA_PNP_NDRQ;
  243         }
  244 
  245         /*
  246          * Now program the resources.
  247          */
  248         for (i = 0; i < config->ic_nmem; i++) {
  249                 uint32_t start;
  250                 uint32_t size;
  251 
  252                 /* XXX: should handle memory control register, 32 bit memory */
  253                 if (config->ic_mem[i].ir_size == 0) {
  254                         pnp_write(PNP_MEM_BASE_HIGH(i), 0);
  255                         pnp_write(PNP_MEM_BASE_LOW(i), 0);
  256                         pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
  257                         pnp_write(PNP_MEM_RANGE_LOW(i), 0);
  258                 } else {
  259                         start = config->ic_mem[i].ir_start;
  260                         size =  config->ic_mem[i].ir_size;
  261                         if (start & 0xff)
  262                                 panic("pnp_set_config: bogus memory assignment");
  263                         pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
  264                         pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
  265                         pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
  266                         pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
  267                 }
  268         }
  269         for (; i < ISA_PNP_NMEM; i++) {
  270                 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
  271                 pnp_write(PNP_MEM_BASE_LOW(i), 0);
  272                 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
  273                 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
  274         }
  275 
  276         for (i = 0; i < config->ic_nport; i++) {
  277                 uint32_t start;
  278 
  279                 if (config->ic_port[i].ir_size == 0) {
  280                         pnp_write(PNP_IO_BASE_HIGH(i), 0);
  281                         pnp_write(PNP_IO_BASE_LOW(i), 0);
  282                 } else {
  283                         start = config->ic_port[i].ir_start;
  284                         pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
  285                         pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
  286                 }
  287         }
  288         for (; i < ISA_PNP_NPORT; i++) {
  289                 pnp_write(PNP_IO_BASE_HIGH(i), 0);
  290                 pnp_write(PNP_IO_BASE_LOW(i), 0);
  291         }
  292 
  293         for (i = 0; i < config->ic_nirq; i++) {
  294                 int irq;
  295 
  296                 /* XXX: interrupt type */
  297                 if (config->ic_irqmask[i] == 0) {
  298                         pnp_write(PNP_IRQ_LEVEL(i), 0);
  299                         pnp_write(PNP_IRQ_TYPE(i), 2);
  300                 } else {
  301                         irq = ffs(config->ic_irqmask[i]) - 1;
  302                         pnp_write(PNP_IRQ_LEVEL(i), irq);
  303                         pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
  304                 }
  305         }
  306         for (; i < ISA_PNP_NIRQ; i++) {
  307                 /*
  308                  * IRQ 0 is not a valid interrupt selection and
  309                  * represents no interrupt selection.
  310                  */
  311                 pnp_write(PNP_IRQ_LEVEL(i), 0);
  312                 pnp_write(PNP_IRQ_TYPE(i), 2);
  313         }               
  314 
  315         for (i = 0; i < config->ic_ndrq; i++) {
  316                 int drq;
  317 
  318                 if (config->ic_drqmask[i] == 0) {
  319                         pnp_write(PNP_DMA_CHANNEL(i), 4);
  320                 } else {
  321                         drq = ffs(config->ic_drqmask[i]) - 1;
  322                         pnp_write(PNP_DMA_CHANNEL(i), drq);
  323                 }
  324         }
  325         for (; i < ISA_PNP_NDRQ; i++) {
  326                 /*
  327                  * DMA channel 4, the cascade channel is used to
  328                  * indicate no DMA channel is active.
  329                  */
  330                 pnp_write(PNP_DMA_CHANNEL(i), 4);
  331         }               
  332 
  333         pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
  334 
  335         /*
  336          * Wake everyone up again, we are finished.
  337          */
  338         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  339 }
  340 
  341 /*
  342  * Process quirks for a logical device.. The card must be in Config state.
  343  */
  344 void
  345 pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn,
  346     struct isa_config *config)
  347 {
  348         struct pnp_quirk *qp;
  349 
  350         for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
  351                 if (qp->vendor_id == vendor_id
  352                     && (qp->logical_id == 0 || qp->logical_id == logical_id)) {
  353                         switch (qp->type) {
  354                         case PNP_QUIRK_WRITE_REG:
  355                                 pnp_write(PNP_SET_LDN, ldn);
  356                                 pnp_write(qp->arg1, qp->arg2);
  357                                 break;
  358                         case PNP_QUIRK_EXTRA_IO:
  359                                 if (config == NULL)
  360                                         break;
  361                                 if (qp->arg1 != 0) {
  362                                         config->ic_nport++;
  363                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
  364                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
  365                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
  366                                 }
  367                                 if (qp->arg2 != 0) {
  368                                         config->ic_nport++;
  369                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
  370                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
  371                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
  372                                 }
  373                                 break;
  374                         }
  375                 }
  376         }
  377 }
  378 
  379 /*
  380  * Scan Resource Data for Logical Devices.
  381  *
  382  * This function exits as soon as it gets an error reading *ANY*
  383  * Resource Data or it reaches the end of Resource Data.  In the first
  384  * case the return value will be TRUE, FALSE otherwise.
  385  */
  386 static int
  387 pnp_create_devices(device_t parent, pnp_id *p, int csn,
  388     u_char *resources, int len)
  389 {
  390         u_char tag, *resp, *resinfo, *startres = NULL;
  391         int large_len, scanning = len, retval = FALSE;
  392         uint32_t logical_id;
  393         device_t dev = 0;
  394         int ldn = 0;
  395         struct pnp_set_config_arg *csnldn;
  396         char buf[100];
  397         char *desc = NULL;
  398 
  399         resp = resources;
  400         while (scanning > 0) {
  401                 tag = *resp++;
  402                 scanning--;
  403                 if (PNP_RES_TYPE(tag) != 0) {
  404                         /* Large resource */
  405                         if (scanning < 2) {
  406                                 scanning = 0;
  407                                 continue;
  408                         }
  409                         large_len = resp[0] + (resp[1] << 8);
  410                         resp += 2;
  411 
  412                         if (scanning < large_len) {
  413                                 scanning = 0;
  414                                 continue;
  415                         }
  416                         resinfo = resp;
  417                         resp += large_len;
  418                         scanning -= large_len;
  419 
  420                         if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
  421                                 if (dev) {
  422                                         /*
  423                                          * This is an optional device
  424                                          * identifier string. Skip it
  425                                          * for now.
  426                                          */
  427                                         continue;
  428                                 }
  429                                 /* else mandately card identifier string */
  430                                 if (large_len > sizeof(buf) - 1)
  431                                         large_len = sizeof(buf) - 1;
  432                                 bcopy(resinfo, buf, large_len);
  433 
  434                                 /*
  435                                  * Trim trailing spaces.
  436                                  */
  437                                 while (buf[large_len-1] == ' ')
  438                                         large_len--;
  439                                 buf[large_len] = '\0';
  440                                 desc = buf;
  441                                 continue;
  442                         }
  443 
  444                         continue;
  445                 }
  446                 
  447                 /* Small resource */
  448                 if (scanning < PNP_SRES_LEN(tag)) {
  449                         scanning = 0;
  450                         continue;
  451                 }
  452                 resinfo = resp;
  453                 resp += PNP_SRES_LEN(tag);
  454                 scanning -= PNP_SRES_LEN(tag);
  455                         
  456                 switch (PNP_SRES_NUM(tag)) {
  457                 case PNP_TAG_LOGICAL_DEVICE:
  458                         /*
  459                          * Parse the resources for the previous
  460                          * logical device (if any).
  461                          */
  462                         if (startres) {
  463                                 pnp_parse_resources(dev, startres,
  464                                     resinfo - startres - 1, ldn);
  465                                 dev = 0;
  466                                 startres = NULL;
  467                         }
  468 
  469                         /* 
  470                          * A new logical device. Scan for end of
  471                          * resources.
  472                          */
  473                         bcopy(resinfo, &logical_id, 4);
  474                         pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
  475                         dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
  476                         if (desc)
  477                                 device_set_desc_copy(dev, desc);
  478                         else
  479                                 device_set_desc_copy(dev,
  480                                     pnp_eisaformat(logical_id));
  481                         isa_set_vendorid(dev, p->vendor_id);
  482                         isa_set_serial(dev, p->serial);
  483                         isa_set_logicalid(dev, logical_id);
  484                         isa_set_configattr(dev,
  485                             ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC);
  486                         csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
  487                         if (!csnldn) {
  488                                 device_printf(parent, "out of memory\n");
  489                                 scanning = 0;
  490                                 break;
  491                         }
  492                         csnldn->csn = csn;
  493                         csnldn->ldn = ldn;
  494                         ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config,
  495                             csnldn);
  496                         isa_set_pnp_csn(dev, csn);
  497                         isa_set_pnp_ldn(dev, ldn);
  498                         ldn++;
  499                         startres = resp;
  500                         break;
  501                     
  502                 case PNP_TAG_END:
  503                         if (!startres) {
  504                                 device_printf(parent, "malformed resources\n");
  505                                 scanning = 0;
  506                                 break;
  507                         }
  508                         pnp_parse_resources(dev, startres,
  509                             resinfo - startres - 1, ldn);
  510                         dev = 0;
  511                         startres = NULL;
  512                         scanning = 0;
  513                         break;
  514 
  515                 default:
  516                         /* Skip this resource */
  517                         break;
  518                 }
  519         }
  520 
  521         return (retval);
  522 }
  523 
  524 /*
  525  * Read 'amount' bytes of resources from the card, allocating memory
  526  * as needed. If a buffer is already available, it should be passed in
  527  * '*resourcesp' and its length in '*spacep'. The number of resource
  528  * bytes already in the buffer should be passed in '*lenp'. The memory
  529  * allocated will be returned in '*resourcesp' with its size and the
  530  * number of bytes of resources in '*spacep' and '*lenp' respectively.
  531  *
  532  * XXX: Multiple problems here, we forget to free() stuff in one
  533  * XXX: error return, and in another case we free (*resourcesp) but
  534  * XXX: don't tell the caller.
  535  */
  536 static int
  537 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
  538 {
  539         u_char *resources = *resourcesp;
  540         u_char *newres;
  541         int space = *spacep;
  542         int len = *lenp;
  543 
  544         if (space == 0) {
  545                 space = 1024;
  546                 resources = malloc(space, M_TEMP, M_NOWAIT);
  547                 if (!resources)
  548                         return (ENOMEM);
  549         }
  550         
  551         if (len + amount > space) {
  552                 int extra = 1024;
  553                 while (len + amount > space + extra)
  554                         extra += 1024;
  555                 newres = malloc(space + extra, M_TEMP, M_NOWAIT);
  556                 if (!newres) {
  557                         /* XXX: free resources */
  558                         return (ENOMEM);
  559                 }
  560                 bcopy(resources, newres, len);
  561                 free(resources, M_TEMP);
  562                 resources = newres;
  563                 space += extra;
  564         }
  565 
  566         if (pnp_get_resource_info(resources + len, amount) != amount)
  567                 return (EINVAL);
  568         len += amount;
  569 
  570         *resourcesp = resources;
  571         *spacep = space;
  572         *lenp = len;
  573 
  574         return (0);
  575 }
  576 
  577 /*
  578  * Read all resources from the card, allocating memory as needed. If a
  579  * buffer is already available, it should be passed in '*resourcesp'
  580  * and its length in '*spacep'. The memory allocated will be returned
  581  * in '*resourcesp' with its size and the number of bytes of resources
  582  * in '*spacep' and '*lenp' respectively.
  583  */
  584 static int
  585 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
  586 {
  587         u_char *resources = *resourcesp;
  588         int space = *spacep;
  589         int len = 0;
  590         int error, done;
  591         u_char tag;
  592 
  593         error = 0;
  594         done = 0;
  595         while (!done) {
  596                 error = pnp_read_bytes(1, &resources, &space, &len);
  597                 if (error)
  598                         goto out;
  599                 tag = resources[len-1];
  600                 if (PNP_RES_TYPE(tag) == 0) {
  601                         /*
  602                          * Small resource, read contents.
  603                          */
  604                         error = pnp_read_bytes(PNP_SRES_LEN(tag),
  605                             &resources, &space, &len);
  606                         if (error)
  607                                 goto out;
  608                         if (PNP_SRES_NUM(tag) == PNP_TAG_END)
  609                                 done = 1;
  610                 } else {
  611                         /*
  612                          * Large resource, read length and contents.
  613                          */
  614                         error = pnp_read_bytes(2, &resources, &space, &len);
  615                         if (error)
  616                                 goto out;
  617                         error = pnp_read_bytes(resources[len-2]
  618                             + (resources[len-1] << 8), &resources, &space,
  619                             &len);
  620                         if (error)
  621                                 goto out;
  622                 }
  623         }
  624 
  625  out:
  626         *resourcesp = resources;
  627         *spacep = space;
  628         *lenp = len;
  629         return (error);
  630 }
  631 
  632 /*
  633  * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
  634  * value (caller should try multiple READ_DATA locations before giving
  635  * up). Upon exiting, all cards are aware that they should use
  636  * pnp_rd_port as the READ_DATA port.
  637  *
  638  * In the first pass, a csn is assigned to each board and pnp_id's
  639  * are saved to an array, pnp_devices. In the second pass, each
  640  * card is woken up and the device configuration is called.
  641  */
  642 static int
  643 pnp_isolation_protocol(device_t parent)
  644 {
  645         int csn;
  646         pnp_id id;
  647         int found = 0, len;
  648         u_char *resources = NULL;
  649         int space = 0;
  650         int error;
  651 
  652         /*
  653          * Put all cards into the Sleep state so that we can clear
  654          * their CSNs.
  655          */
  656         pnp_send_initiation_key();
  657 
  658         /*
  659          * Clear the CSN for all cards.
  660          */
  661         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
  662 
  663         /*
  664          * Move all cards to the Isolation state.
  665          */
  666         pnp_write(PNP_WAKE, 0);
  667 
  668         /*
  669          * Tell them where the read point is going to be this time.
  670          */
  671         pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
  672 
  673         for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
  674                 /*
  675                  * Start the serial isolation protocol.
  676                  */
  677                 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  678                 DELAY(1000);    /* Delay 1 msec */
  679 
  680                 if (pnp_get_serial(&id)) {
  681                         /*
  682                          * We have read the id from a card
  683                          * successfully. The card which won the
  684                          * isolation protocol will be in Isolation
  685                          * mode and all others will be in Sleep.
  686                          * Program the CSN of the isolated card
  687                          * (taking it to Config state) and read its
  688                          * resources, creating devices as we find
  689                          * logical devices on the card.
  690                          */
  691                         pnp_write(PNP_SET_CSN, csn);
  692                         if (bootverbose)
  693                                 printf("Reading PnP configuration for %s.\n",
  694                                     pnp_eisaformat(id.vendor_id));
  695                         error = pnp_read_resources(&resources, &space, &len);
  696                         if (error)
  697                                 break;
  698                         pnp_create_devices(parent, &id, csn, resources, len);
  699                         found++;
  700                 } else
  701                         break;
  702 
  703                 /*
  704                  * Put this card back to the Sleep state and
  705                  * simultaneously move all cards which don't have a
  706                  * CSN yet to Isolation state.
  707                  */
  708                 pnp_write(PNP_WAKE, 0);
  709         }
  710 
  711         /*
  712          * Unless we have chosen the wrong read port, all cards will
  713          * be in Sleep state. Put them back into WaitForKey for
  714          * now. Their resources will be programmed later.
  715          */
  716         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  717 
  718         /*
  719          * Cleanup.
  720          */
  721         if (resources)
  722                 free(resources, M_TEMP);
  723 
  724         return (found);
  725 }
  726 
  727 
  728 /*
  729  * pnp_identify()
  730  *
  731  * autoconfiguration of pnp devices. This routine just runs the
  732  * isolation protocol over several ports, until one is successful.
  733  *
  734  * may be called more than once ?
  735  *
  736  */
  737 
  738 static void
  739 pnp_identify(driver_t *driver, device_t parent)
  740 {
  741         int num_pnp_devs;
  742 
  743         /* Try various READ_DATA ports from 0x203-0x3ff */
  744         for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
  745                 if (bootverbose)
  746                         printf("pnp_identify: Trying Read_Port at %x\n",
  747                             (pnp_rd_port << 2) | 0x3);
  748 
  749                 num_pnp_devs = pnp_isolation_protocol(parent);
  750                 if (num_pnp_devs)
  751                         break;
  752         }
  753         if (bootverbose)
  754                 printf("PNP Identify complete\n");
  755 }
  756 
  757 static device_method_t pnp_methods[] = {
  758         /* Device interface */
  759         DEVMETHOD(device_identify,      pnp_identify),
  760 
  761         { 0, 0 }
  762 };
  763 
  764 static driver_t pnp_driver = {
  765         "pnp",
  766         pnp_methods,
  767         1,                      /* no softc */
  768 };
  769 
  770 static devclass_t pnp_devclass;
  771 
  772 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);

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