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  *      from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/bus.h>
   37 #include <sys/malloc.h>
   38 #include <isa/isavar.h>
   39 #include <isa/pnpreg.h>
   40 #include <isa/pnpvar.h>
   41 #include <machine/bus.h>
   42 
   43 typedef struct _pnp_id {
   44         u_int32_t vendor_id;
   45         u_int32_t serial;
   46         u_char checksum;
   47 } pnp_id;
   48 
   49 struct pnp_set_config_arg {
   50         int     csn;            /* Card number to configure */
   51         int     ldn;            /* Logical device on card */
   52 };
   53 
   54 struct pnp_quirk {
   55         u_int32_t vendor_id;    /* Vendor of the card */
   56         u_int32_t logical_id;   /* ID of the device with quirk */
   57         int     type;
   58 #define PNP_QUIRK_WRITE_REG     1 /* Need to write a pnp register  */
   59 #define PNP_QUIRK_EXTRA_IO      2 /* Has extra io ports  */
   60         int     arg1;
   61         int     arg2;
   62 };
   63 
   64 struct pnp_quirk pnp_quirks[] = {
   65         /*
   66          * The Gravis UltraSound needs register 0xf2 to be set to 0xff
   67          * to enable power.
   68          * XXX need to know the logical device id.
   69          */
   70         { 0x0100561e /* GRV0001 */,     0,
   71           PNP_QUIRK_WRITE_REG,  0xf2,    0xff },
   72         /*
   73          * An emu8000 does not give us other than the first
   74          * port.
   75          */
   76         { 0x26008c0e /* SB16 */,        0x21008c0e,
   77           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   78         { 0x42008c0e /* SB32(CTL0042) */,       0x21008c0e,
   79           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   80         { 0x44008c0e /* SB32(CTL0044) */,       0x21008c0e,
   81           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   82         { 0x49008c0e /* SB32(CTL0049) */,       0x21008c0e,
   83           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   84         { 0xf1008c0e /* SB32(CTL00f1) */,       0x21008c0e,
   85           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   86         { 0xc1008c0e /* SB64(CTL00c1) */,       0x22008c0e,
   87           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   88         { 0xc5008c0e /* SB64(CTL00c5) */,       0x22008c0e,
   89           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   90         { 0xe4008c0e /* SB64(CTL00e4) */,       0x22008c0e,
   91           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   92 
   93         { 0 }
   94 };
   95 
   96 #ifdef PC98
   97 /* Some NEC PnP cards have 9 bytes serial code. */
   98 static pnp_id necids[] = {
   99         {0x4180a3b8, 0xffffffff, 0x00}, /* PC-9801CB-B04 (NEC8041) */
  100         {0x5181a3b8, 0xffffffff, 0x46}, /* PC-9821CB2-B04(NEC8151) */
  101         {0x5182a3b8, 0xffffffff, 0xb8}, /* PC-9801-XX    (NEC8251) */
  102         {0x9181a3b8, 0xffffffff, 0x00}, /* PC-9801-120   (NEC8191) */
  103         {0, 0, 0}
  104 };
  105 #endif
  106 
  107 #if 0
  108 /*
  109  * these entries are initialized using the autoconfig menu
  110  * The struct is invalid (and must be initialized) if the first
  111  * CSN is zero. The init code fills invalid entries with CSN 255
  112  * which is not a supported value.
  113  */
  114 
  115 struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = {
  116     { 0 }
  117 };
  118 #endif
  119 
  120 /* The READ_DATA port that we are using currently */
  121 static int pnp_rd_port;
  122 
  123 static void   pnp_send_initiation_key(void);
  124 static int    pnp_get_serial(pnp_id *p);
  125 static int    pnp_isolation_protocol(device_t parent);
  126 
  127 char *
  128 pnp_eisaformat(u_int32_t id)
  129 {
  130         u_int8_t *data = (u_int8_t *) &id;
  131         static char idbuf[8];
  132         const char  hextoascii[] = "0123456789abcdef";
  133 
  134         idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
  135         idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
  136         idbuf[2] = '@' + (data[1] & 0x1f);
  137         idbuf[3] = hextoascii[(data[2] >> 4)];
  138         idbuf[4] = hextoascii[(data[2] & 0xf)];
  139         idbuf[5] = hextoascii[(data[3] >> 4)];
  140         idbuf[6] = hextoascii[(data[3] & 0xf)];
  141         idbuf[7] = 0;
  142         return(idbuf);
  143 }
  144 
  145 static void
  146 pnp_write(int d, u_char r)
  147 {
  148         outb (_PNP_ADDRESS, d);
  149         outb (_PNP_WRITE_DATA, r);
  150 }
  151 
  152 #if 0
  153 
  154 static u_char
  155 pnp_read(int d)
  156 {
  157         outb (_PNP_ADDRESS, d);
  158         return (inb(3 | (pnp_rd_port <<2)));
  159 }
  160 
  161 #endif
  162 
  163 /*
  164  * Send Initiation LFSR as described in "Plug and Play ISA Specification",
  165  * Intel May 94.
  166  */
  167 static void
  168 pnp_send_initiation_key()
  169 {
  170         int cur, i;
  171 
  172         /* Reset the LSFR */
  173         outb(_PNP_ADDRESS, 0);
  174         outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
  175 
  176         cur = 0x6a;
  177         outb(_PNP_ADDRESS, cur);
  178 
  179         for (i = 1; i < 32; i++) {
  180                 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
  181                 outb(_PNP_ADDRESS, cur);
  182         }
  183 }
  184 
  185 
  186 /*
  187  * Get the device's serial number.  Returns 1 if the serial is valid.
  188  */
  189 static int
  190 pnp_get_serial(pnp_id *p)
  191 {
  192         int i, bit, valid = 0, sum = 0x6a;
  193         u_char *data = (u_char *)p;
  194 
  195         bzero(data, sizeof(char) * 9);
  196         outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  197         for (i = 0; i < 72; i++) {
  198                 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
  199                 DELAY(250);     /* Delay 250 usec */
  200 
  201                 /* Can't Short Circuit the next evaluation, so 'and' is last */
  202                 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
  203                 DELAY(250);     /* Delay 250 usec */
  204 
  205                 valid = valid || bit;
  206 
  207                 if (i < 64)
  208                         sum = (sum >> 1) |
  209                                 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
  210 
  211                 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
  212         }
  213 
  214         valid = valid && (data[8] == sum);
  215 
  216         return valid;
  217 }
  218 
  219 /*
  220  * Fill's the buffer with resource info from the device.
  221  * Returns the number of characters read.
  222  */
  223 static int
  224 pnp_get_resource_info(u_char *buffer, int len)
  225 {
  226         int i, j, count;
  227         u_char temp;
  228 
  229         count = 0;
  230         for (i = 0; i < len; i++) {
  231                 outb(_PNP_ADDRESS, PNP_STATUS);
  232                 for (j = 0; j < 100; j++) {
  233                         if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
  234                                 break;
  235                         DELAY(1);
  236                 }
  237                 if (j == 100) {
  238                         printf("PnP device failed to report resource data\n");
  239                         return count;
  240                 }
  241                 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
  242                 temp = inb((pnp_rd_port << 2) | 0x3);
  243                 if (buffer != NULL)
  244                         buffer[i] = temp;
  245                 count++;
  246         }
  247         return count;
  248 }
  249 
  250 #if 0
  251 /*
  252  * write_pnp_parms initializes a logical device with the parms
  253  * in d, and then activates the board if the last parameter is 1.
  254  */
  255 
  256 static int
  257 write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn)
  258 {
  259     int i, empty = -1 ;
  260 
  261     pnp_write (SET_LDN, ldn );
  262     i = pnp_read(SET_LDN) ;
  263     if (i != ldn) {
  264         printf("Warning: LDN %d does not exist\n", ldn);
  265     }
  266     for (i = 0; i < 8; i++) {
  267         pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 );
  268         pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff );
  269     }
  270     for (i = 0; i < 4; i++) {
  271         pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff );
  272         pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff );
  273         pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff );
  274         pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff );
  275         pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff );
  276     }
  277     for (i = 0; i < 2; i++) {
  278         pnp_write(IRQ_CONFIG + i*2    , d->irq[i] );
  279         pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] );
  280         pnp_write(DRQ_CONFIG + i, d->drq[i] );
  281     }
  282     /*
  283      * store parameters read into the current kernel
  284      * so manual editing next time is easier
  285      */
  286     for (i = 0 ; i < MAX_PNP_LDN; i++) {
  287         if (pnp_ldn_overrides[i].csn == d->csn &&
  288                 pnp_ldn_overrides[i].ldn == ldn) {
  289             d->flags = pnp_ldn_overrides[i].flags ;
  290             pnp_ldn_overrides[i] = *d ;
  291             break ;
  292         } else if (pnp_ldn_overrides[i].csn < 1 ||
  293                 pnp_ldn_overrides[i].csn == 255)
  294             empty = i ;
  295     }
  296     if (i== MAX_PNP_LDN && empty != -1)
  297         pnp_ldn_overrides[empty] = *d;
  298 
  299     /*
  300      * Here should really perform the range check, and
  301      * return a failure if not successful.
  302      */
  303     pnp_write (IO_RANGE_CHECK, 0);
  304     DELAY(1000); /* XXX is it really necessary ? */
  305     pnp_write (ACTIVATE, d->enable ? 1 : 0);
  306     DELAY(1000); /* XXX is it really necessary ? */
  307     return 1 ;
  308 }
  309 #endif
  310 
  311 /*
  312  * This function is called after the bus has assigned resource
  313  * locations for a logical device.
  314  */
  315 static void
  316 pnp_set_config(void *arg, struct isa_config *config, int enable)
  317 {
  318         int csn = ((struct pnp_set_config_arg *) arg)->csn;
  319         int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
  320         int i;
  321 
  322         /*
  323          * First put all cards into Sleep state with the initiation
  324          * key, then put our card into Config state.
  325          */
  326         pnp_send_initiation_key();
  327         pnp_write(PNP_WAKE, csn);
  328 
  329         /*
  330          * Select our logical device so that we can program it.
  331          */
  332         pnp_write(PNP_SET_LDN, ldn);
  333 
  334         /*
  335          * Constrain the number of resources we will try to program
  336          */
  337         if (config->ic_nmem > ISA_PNP_NMEM) {
  338             printf("too many ISA memory ranges (%d > %d)\n", config->ic_nmem, ISA_PNP_NMEM);
  339             config->ic_nmem = ISA_PNP_NMEM;
  340         }
  341         if (config->ic_nport > ISA_PNP_NPORT) {
  342             printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport, ISA_PNP_NPORT);
  343             config->ic_nport = ISA_PNP_NPORT;
  344         }
  345         if (config->ic_nirq > ISA_PNP_NIRQ) {
  346             printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq, ISA_PNP_NIRQ);
  347             config->ic_nirq = ISA_PNP_NIRQ;
  348         }
  349         if (config->ic_ndrq > ISA_PNP_NDRQ) {
  350             printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq, ISA_PNP_NDRQ);
  351             config->ic_ndrq = ISA_PNP_NDRQ;
  352         }
  353 
  354         /*
  355          * Now program the resources.
  356          */
  357         for (i = 0; i < config->ic_nmem; i++) {
  358                 u_int32_t start;
  359                 u_int32_t size;
  360 
  361                 /* XXX: should handle memory control register, 32 bit memory */
  362                 if (config->ic_mem[i].ir_size == 0) {
  363                         pnp_write(PNP_MEM_BASE_HIGH(i), 0);
  364                         pnp_write(PNP_MEM_BASE_LOW(i), 0);
  365                         pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
  366                         pnp_write(PNP_MEM_RANGE_LOW(i), 0);
  367                 } else {
  368                         start = config->ic_mem[i].ir_start;
  369                         size =  config->ic_mem[i].ir_size;
  370                         if (start & 0xff)
  371                                 panic("pnp_set_config: bogus memory assignment");
  372                         pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
  373                         pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
  374                         pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
  375                         pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
  376                 }
  377         }
  378         for (; i < ISA_PNP_NMEM; i++) {
  379                 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
  380                 pnp_write(PNP_MEM_BASE_LOW(i), 0);
  381                 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
  382                 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
  383         }
  384 
  385         for (i = 0; i < config->ic_nport; i++) {
  386                 u_int32_t start;
  387 
  388                 if (config->ic_port[i].ir_size == 0) {
  389                         pnp_write(PNP_IO_BASE_HIGH(i), 0);
  390                         pnp_write(PNP_IO_BASE_LOW(i), 0);
  391                 } else {
  392                         start = config->ic_port[i].ir_start;
  393                         pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
  394                         pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
  395                 }
  396         }
  397         for (; i < ISA_PNP_NPORT; i++) {
  398                 pnp_write(PNP_IO_BASE_HIGH(i), 0);
  399                 pnp_write(PNP_IO_BASE_LOW(i), 0);
  400         }
  401 
  402         for (i = 0; i < config->ic_nirq; i++) {
  403                 int irq;
  404 
  405                 /* XXX: interrupt type */
  406                 if (config->ic_irqmask[i] == 0) {
  407                         pnp_write(PNP_IRQ_LEVEL(i), 0);
  408                         pnp_write(PNP_IRQ_TYPE(i), 2);
  409                 } else {
  410                         irq = ffs(config->ic_irqmask[i]) - 1;
  411                         pnp_write(PNP_IRQ_LEVEL(i), irq);
  412                         pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
  413                 }
  414         }
  415         for (; i < ISA_PNP_NIRQ; i++) {
  416                 /*
  417                  * IRQ 0 is not a valid interrupt selection and
  418                  * represents no interrupt selection.
  419                  */
  420                 pnp_write(PNP_IRQ_LEVEL(i), 0);
  421                 pnp_write(PNP_IRQ_TYPE(i), 2);
  422         }               
  423 
  424         for (i = 0; i < config->ic_ndrq; i++) {
  425                 int drq;
  426 
  427                 if (config->ic_drqmask[i] == 0) {
  428                         pnp_write(PNP_DMA_CHANNEL(i), 4);
  429                 } else {
  430                         drq = ffs(config->ic_drqmask[i]) - 1;
  431                         pnp_write(PNP_DMA_CHANNEL(i), drq);
  432                 }
  433         }
  434         for (; i < ISA_PNP_NDRQ; i++) {
  435                 /*
  436                  * DMA channel 4, the cascade channel is used to
  437                  * indicate no DMA channel is active.
  438                  */
  439                 pnp_write(PNP_DMA_CHANNEL(i), 4);
  440         }               
  441 
  442         pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
  443 
  444         /*
  445          * Wake everyone up again, we are finished.
  446          */
  447         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  448 }
  449 
  450 /*
  451  * Process quirks for a logical device.. The card must be in Config state.
  452  */
  453 void
  454 pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn, struct isa_config *config)
  455 {
  456         struct pnp_quirk *qp;
  457 
  458         for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
  459                 if (qp->vendor_id == vendor_id
  460                     && (qp->logical_id == 0
  461                         || qp->logical_id == logical_id)) {
  462                         switch (qp->type) {
  463                         case PNP_QUIRK_WRITE_REG:
  464                                 pnp_write(PNP_SET_LDN, ldn);
  465                                 pnp_write(qp->arg1, qp->arg2);
  466                                 break;
  467                         case PNP_QUIRK_EXTRA_IO:
  468                                 if (config == NULL)
  469                                         break;
  470                                 if (qp->arg1 != 0) {
  471                                         config->ic_nport++;
  472                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
  473                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
  474                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
  475                                 }
  476                                 if (qp->arg2 != 0) {
  477                                         config->ic_nport++;
  478                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
  479                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
  480                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
  481                                 }
  482                                 break;
  483                         }
  484                 }
  485         }
  486 }
  487 
  488 /*
  489  * Scan Resource Data for Logical Devices.
  490  *
  491  * This function exits as soon as it gets an error reading *ANY*
  492  * Resource Data or it reaches the end of Resource Data.  In the first
  493  * case the return value will be TRUE, FALSE otherwise.
  494  */
  495 static int
  496 pnp_create_devices(device_t parent, pnp_id *p, int csn,
  497                    u_char *resources, int len)
  498 {
  499         u_char tag, *resp, *resinfo, *startres = 0;
  500         int large_len, scanning = len, retval = FALSE;
  501         u_int32_t logical_id;
  502         device_t dev = 0;
  503         int ldn = 0;
  504         struct pnp_set_config_arg *csnldn;
  505         char buf[100];
  506         char *desc = 0;
  507 
  508         resp = resources;
  509         while (scanning > 0) {
  510                 tag = *resp++;
  511                 scanning--;
  512                 if (PNP_RES_TYPE(tag) != 0) {
  513                         /* Large resource */
  514                         if (scanning < 2) {
  515                                 scanning = 0;
  516                                 continue;
  517                         }
  518                         large_len = resp[0] + (resp[1] << 8);
  519                         resp += 2;
  520 
  521                         if (scanning < large_len) {
  522                                 scanning = 0;
  523                                 continue;
  524                         }
  525                         resinfo = resp;
  526                         resp += large_len;
  527                         scanning -= large_len;
  528 
  529                         if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
  530                                 if (dev) {
  531                                         /*
  532                                          * This is an optional device
  533                                          * indentifier string. Skipt it
  534                                          * for now.
  535                                          */
  536                                         continue;
  537                                 }
  538                                 /* else mandately card identifier string */
  539                                 if (large_len > sizeof(buf) - 1)
  540                                         large_len = sizeof(buf) - 1;
  541                                 bcopy(resinfo, buf, large_len);
  542 
  543                                 /*
  544                                  * Trim trailing spaces.
  545                                  */
  546                                 while (buf[large_len-1] == ' ')
  547                                         large_len--;
  548                                 buf[large_len] = '\0';
  549                                 desc = buf;
  550                                 continue;
  551                         }
  552 
  553                         continue;
  554                 }
  555                 
  556                 /* Small resource */
  557                 if (scanning < PNP_SRES_LEN(tag)) {
  558                         scanning = 0;
  559                         continue;
  560                 }
  561                 resinfo = resp;
  562                 resp += PNP_SRES_LEN(tag);
  563                 scanning -= PNP_SRES_LEN(tag);;
  564                         
  565                 switch (PNP_SRES_NUM(tag)) {
  566                 case PNP_TAG_LOGICAL_DEVICE:
  567                         /*
  568                          * Parse the resources for the previous
  569                          * logical device (if any).
  570                          */
  571                         if (startres) {
  572                                 pnp_parse_resources(dev, startres,
  573                                                     resinfo - startres - 1,
  574                                                     ldn);
  575                                 dev = 0;
  576                                 startres = 0;
  577                         }
  578 
  579                         /* 
  580                          * A new logical device. Scan for end of
  581                          * resources.
  582                          */
  583                         bcopy(resinfo, &logical_id, 4);
  584                         pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
  585                         dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
  586                         if (desc)
  587                                 device_set_desc_copy(dev, desc);
  588                         else
  589                                 device_set_desc_copy(dev,
  590                                                      pnp_eisaformat(logical_id));
  591                         isa_set_vendorid(dev, p->vendor_id);
  592                         isa_set_serial(dev, p->serial);
  593                         isa_set_logicalid(dev, logical_id);
  594                         isa_set_configattr(dev,
  595                                            ISACFGATTR_CANDISABLE |
  596                                            ISACFGATTR_DYNAMIC);
  597                         csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
  598                         if (!csnldn) {
  599                                 device_printf(parent,
  600                                               "out of memory\n");
  601                                 scanning = 0;
  602                                 break;
  603                         }
  604                         csnldn->csn = csn;
  605                         csnldn->ldn = ldn;
  606                         ISA_SET_CONFIG_CALLBACK(parent, dev,
  607                                                 pnp_set_config, csnldn);
  608                         ldn++;
  609                         startres = resp;
  610                         break;
  611                     
  612                 case PNP_TAG_END:
  613                         if (!startres) {
  614                                 device_printf(parent,
  615                                               "malformed resources\n");
  616                                 scanning = 0;
  617                                 break;
  618                         }
  619                         pnp_parse_resources(dev, startres,
  620                                             resinfo - startres - 1, ldn);
  621                         dev = 0;
  622                         startres = 0;
  623                         scanning = 0;
  624                         break;
  625 
  626                 default:
  627                         /* Skip this resource */
  628                         break;
  629                 }
  630         }
  631 
  632         return retval;
  633 }
  634 
  635 /*
  636  * Read 'amount' bytes of resources from the card, allocating memory
  637  * as needed. If a buffer is already available, it should be passed in
  638  * '*resourcesp' and its length in '*spacep'. The number of resource
  639  * bytes already in the buffer should be passed in '*lenp'. The memory
  640  * allocated will be returned in '*resourcesp' with its size and the
  641  * number of bytes of resources in '*spacep' and '*lenp' respectively.
  642  *
  643  * XXX: Multiple problems here, we forget to free() stuff in one
  644  * XXX: error return, and in another case we free (*resourcesp) but
  645  * XXX: don't tell the caller.
  646  */
  647 static int
  648 pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
  649 {
  650         u_char *resources = *resourcesp;
  651         u_char *newres;
  652         int space = *spacep;
  653         int len = *lenp;
  654 
  655         if (space == 0) {
  656                 space = 1024;
  657                 resources = malloc(space, M_TEMP, M_NOWAIT);
  658                 if (!resources)
  659                         return ENOMEM;
  660         }
  661         
  662         if (len + amount > space) {
  663                 int extra = 1024;
  664                 while (len + amount > space + extra)
  665                         extra += 1024;
  666                 newres = malloc(space + extra, M_TEMP, M_NOWAIT);
  667                 if (!newres) {
  668                         /* XXX: free resources */
  669                         return ENOMEM;
  670                 }
  671                 bcopy(resources, newres, len);
  672                 free(resources, M_TEMP);
  673                 resources = newres;
  674                 space += extra;
  675         }
  676 
  677         if (pnp_get_resource_info(resources + len, amount) != amount)
  678                 return EINVAL;
  679         len += amount;
  680 
  681         *resourcesp = resources;
  682         *spacep = space;
  683         *lenp = len;
  684 
  685         return 0;
  686 }
  687 
  688 /*
  689  * Read all resources from the card, allocating memory as needed. If a
  690  * buffer is already available, it should be passed in '*resourcesp'
  691  * and its length in '*spacep'. The memory allocated will be returned
  692  * in '*resourcesp' with its size and the number of bytes of resources
  693  * in '*spacep' and '*lenp' respectively.
  694  */
  695 static int
  696 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
  697 {
  698         u_char *resources = *resourcesp;
  699         int space = *spacep;
  700         int len = 0;
  701         int error, done;
  702         u_char tag;
  703 
  704         error = 0;
  705         done = 0;
  706         while (!done) {
  707                 error = pnp_read_bytes(1, &resources, &space, &len);
  708                 if (error)
  709                         goto out;
  710                 tag = resources[len-1];
  711                 if (PNP_RES_TYPE(tag) == 0) {
  712                         /*
  713                          * Small resource, read contents.
  714                          */
  715                         error = pnp_read_bytes(PNP_SRES_LEN(tag),
  716                                                &resources, &space, &len);
  717                         if (error)
  718                                 goto out;
  719                         if (PNP_SRES_NUM(tag) == PNP_TAG_END)
  720                                 done = 1;
  721                 } else {
  722                         /*
  723                          * Large resource, read length and contents.
  724                          */
  725                         error = pnp_read_bytes(2, &resources, &space, &len);
  726                         if (error)
  727                                 goto out;
  728                         error = pnp_read_bytes(resources[len-2]
  729                                                + (resources[len-1] << 8),
  730                                                &resources, &space, &len);
  731                         if (error)
  732                                 goto out;
  733                 }
  734         }
  735 
  736  out:
  737         *resourcesp = resources;
  738         *spacep = space;
  739         *lenp = len;
  740         return error;
  741 }
  742 
  743 /*
  744  * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
  745  * value (caller should try multiple READ_DATA locations before giving
  746  * up). Upon exiting, all cards are aware that they should use
  747  * pnp_rd_port as the READ_DATA port.
  748  *
  749  * In the first pass, a csn is assigned to each board and pnp_id's
  750  * are saved to an array, pnp_devices. In the second pass, each
  751  * card is woken up and the device configuration is called.
  752  */
  753 static int
  754 pnp_isolation_protocol(device_t parent)
  755 {
  756         int csn;
  757         pnp_id id;
  758         int found = 0, len;
  759         u_char *resources = 0;
  760         int space = 0;
  761         int error;
  762 #ifdef PC98
  763         int n, necpnp;
  764         u_char buffer[10];
  765 #endif
  766 
  767         /*
  768          * Put all cards into the Sleep state so that we can clear
  769          * their CSNs.
  770          */
  771         pnp_send_initiation_key();
  772 
  773         /*
  774          * Clear the CSN for all cards.
  775          */
  776         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
  777 
  778         /*
  779          * Move all cards to the Isolation state.
  780          */
  781         pnp_write(PNP_WAKE, 0);
  782 
  783         /*
  784          * Tell them where the read point is going to be this time.
  785          */
  786         pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
  787 
  788         for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
  789                 /*
  790                  * Start the serial isolation protocol.
  791                  */
  792                 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  793                 DELAY(1000);    /* Delay 1 msec */
  794 
  795                 if (pnp_get_serial(&id)) {
  796                         /*
  797                          * We have read the id from a card
  798                          * successfully. The card which won the
  799                          * isolation protocol will be in Isolation
  800                          * mode and all others will be in Sleep.
  801                          * Program the CSN of the isolated card
  802                          * (taking it to Config state) and read its
  803                          * resources, creating devices as we find
  804                          * logical devices on the card.
  805                          */
  806                         pnp_write(PNP_SET_CSN, csn);
  807 #ifdef PC98
  808                         if (bootverbose)
  809                                 printf("PnP Vendor ID = %x\n", id.vendor_id);
  810                         /* Check for NEC PnP (9 bytes serial). */
  811                         for (n = necpnp = 0; necids[n].vendor_id; n++) {
  812                                 if (id.vendor_id == necids[n].vendor_id) {
  813                                         necpnp = 1;
  814                                         break;
  815                                 }
  816                         }
  817                         if (necpnp) {
  818                                 if (bootverbose)
  819                                         printf("It seems to NEC-PnP card (%s).\n",
  820                                                pnp_eisaformat(id.vendor_id));
  821                                 /*  Read dummy 9 bytes serial area. */
  822                                 pnp_get_resource_info(buffer, 9);
  823                         } else {
  824                                 if (bootverbose)
  825                                         printf("It seems to Normal-ISA-PnP card (%s).\n",
  826                                                pnp_eisaformat(id.vendor_id));
  827                         }
  828                         if (bootverbose)
  829                                 printf("Reading PnP configuration for %s.\n",
  830                                        pnp_eisaformat(id.vendor_id));
  831 #endif
  832                         error = pnp_read_resources(&resources,
  833                                                    &space,
  834                                                    &len);
  835                         if (error)
  836                                 break;
  837                         pnp_create_devices(parent, &id, csn,
  838                                            resources, len);
  839                         found++;
  840                 } else
  841                         break;
  842 
  843                 /*
  844                  * Put this card back to the Sleep state and
  845                  * simultaneously move all cards which don't have a
  846                  * CSN yet to Isolation state.
  847                  */
  848                 pnp_write(PNP_WAKE, 0);
  849         }
  850 
  851         /*
  852          * Unless we have chosen the wrong read port, all cards will
  853          * be in Sleep state. Put them back into WaitForKey for
  854          * now. Their resources will be programmed later.
  855          */
  856         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  857 
  858         /*
  859          * Cleanup.
  860          */
  861         if (resources)
  862                 free(resources, M_TEMP);
  863 
  864         return found;
  865 }
  866 
  867 
  868 /*
  869  * pnp_identify()
  870  *
  871  * autoconfiguration of pnp devices. This routine just runs the
  872  * isolation protocol over several ports, until one is successful.
  873  *
  874  * may be called more than once ?
  875  *
  876  */
  877 
  878 static void
  879 pnp_identify(driver_t *driver, device_t parent)
  880 {
  881         int num_pnp_devs;
  882 
  883 #if 0
  884         if (pnp_ldn_overrides[0].csn == 0) {
  885                 if (bootverbose)
  886                         printf("Initializing PnP override table\n");
  887                 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides));
  888                 pnp_ldn_overrides[0].csn = 255 ;
  889         }
  890 #endif
  891 
  892         /* Try various READ_DATA ports from 0x203-0x3ff */
  893         for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
  894                 if (bootverbose)
  895                         printf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3);
  896 
  897                 num_pnp_devs = pnp_isolation_protocol(parent);
  898                 if (num_pnp_devs)
  899                         break;
  900         }
  901 }
  902 
  903 static device_method_t pnp_methods[] = {
  904         /* Device interface */
  905         DEVMETHOD(device_identify,      pnp_identify),
  906 
  907         { 0, 0 }
  908 };
  909 
  910 static driver_t pnp_driver = {
  911         "pnp",
  912         pnp_methods,
  913         1,                      /* no softc */
  914 };
  915 
  916 static devclass_t pnp_devclass;
  917 
  918 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);

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