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 1.14 2002/10/16 10:40:43 phk 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/bus.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 #define PNP_QUIRK_EXTRA_IO      2 /* Has extra io ports  */
   58         int     arg1;
   59         int     arg2;
   60 };
   61 
   62 struct pnp_quirk pnp_quirks[] = {
   63         /*
   64          * The Gravis UltraSound needs register 0xf2 to be set to 0xff
   65          * to enable power.
   66          * XXX need to know the logical device id.
   67          */
   68         { 0x0100561e /* GRV0001 */,     0,
   69           PNP_QUIRK_WRITE_REG,  0xf2,    0xff },
   70         /*
   71          * An emu8000 does not give us other than the first
   72          * port.
   73          */
   74         { 0x26008c0e /* SB16 */,        0x21008c0e,
   75           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   76         { 0x42008c0e /* SB32(CTL0042) */,       0x21008c0e,
   77           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   78         { 0x44008c0e /* SB32(CTL0044) */,       0x21008c0e,
   79           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   80         { 0x49008c0e /* SB32(CTL0049) */,       0x21008c0e,
   81           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   82         { 0xf1008c0e /* SB32(CTL00f1) */,       0x21008c0e,
   83           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   84         { 0xc1008c0e /* SB64(CTL00c1) */,       0x22008c0e,
   85           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   86         { 0xc5008c0e /* SB64(CTL00c5) */,       0x22008c0e,
   87           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   88         { 0xe4008c0e /* SB64(CTL00e4) */,       0x22008c0e,
   89           PNP_QUIRK_EXTRA_IO,   0x400,   0x800 },
   90 
   91         { 0 }
   92 };
   93 
   94 #ifdef PC98
   95 /* Some NEC PnP cards have 9 bytes serial code. */
   96 static pnp_id necids[] = {
   97         {0x4180a3b8, 0xffffffff, 0x00}, /* PC-9801CB-B04 (NEC8041) */
   98         {0x5181a3b8, 0xffffffff, 0x46}, /* PC-9821CB2-B04(NEC8151) */
   99         {0x5182a3b8, 0xffffffff, 0xb8}, /* PC-9801-XX    (NEC8251) */
  100         {0x9181a3b8, 0xffffffff, 0x00}, /* PC-9801-120   (NEC8191) */
  101         {0, 0, 0}
  102 };
  103 #endif
  104 
  105 #if 0
  106 /*
  107  * these entries are initialized using the autoconfig menu
  108  * The struct is invalid (and must be initialized) if the first
  109  * CSN is zero. The init code fills invalid entries with CSN 255
  110  * which is not a supported value.
  111  */
  112 
  113 struct pnp_cinfo pnp_ldn_overrides[MAX_PNP_LDN] = {
  114     { 0 }
  115 };
  116 #endif
  117 
  118 /* The READ_DATA port that we are using currently */
  119 static int pnp_rd_port;
  120 
  121 static void   pnp_send_initiation_key(void);
  122 static int    pnp_get_serial(pnp_id *p);
  123 static int    pnp_isolation_protocol(device_t parent);
  124 
  125 char *
  126 pnp_eisaformat(u_int32_t id)
  127 {
  128         u_int8_t *data = (u_int8_t *) &id;
  129         static char idbuf[8];
  130         const char  hextoascii[] = "0123456789abcdef";
  131 
  132         idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
  133         idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
  134         idbuf[2] = '@' + (data[1] & 0x1f);
  135         idbuf[3] = hextoascii[(data[2] >> 4)];
  136         idbuf[4] = hextoascii[(data[2] & 0xf)];
  137         idbuf[5] = hextoascii[(data[3] >> 4)];
  138         idbuf[6] = hextoascii[(data[3] & 0xf)];
  139         idbuf[7] = 0;
  140         return(idbuf);
  141 }
  142 
  143 static void
  144 pnp_write(int d, u_char r)
  145 {
  146         outb (_PNP_ADDRESS, d);
  147         outb (_PNP_WRITE_DATA, r);
  148 }
  149 
  150 #if 0
  151 
  152 static u_char
  153 pnp_read(int d)
  154 {
  155         outb (_PNP_ADDRESS, d);
  156         return (inb(3 | (pnp_rd_port <<2)));
  157 }
  158 
  159 #endif
  160 
  161 /*
  162  * Send Initiation LFSR as described in "Plug and Play ISA Specification",
  163  * Intel May 94.
  164  */
  165 static void
  166 pnp_send_initiation_key()
  167 {
  168         int cur, i;
  169 
  170         /* Reset the LSFR */
  171         outb(_PNP_ADDRESS, 0);
  172         outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
  173 
  174         cur = 0x6a;
  175         outb(_PNP_ADDRESS, cur);
  176 
  177         for (i = 1; i < 32; i++) {
  178                 cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
  179                 outb(_PNP_ADDRESS, cur);
  180         }
  181 }
  182 
  183 
  184 /*
  185  * Get the device's serial number.  Returns 1 if the serial is valid.
  186  */
  187 static int
  188 pnp_get_serial(pnp_id *p)
  189 {
  190         int i, bit, valid = 0, sum = 0x6a;
  191         u_char *data = (u_char *)p;
  192 
  193         bzero(data, sizeof(char) * 9);
  194         outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  195         for (i = 0; i < 72; i++) {
  196                 bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
  197                 DELAY(250);     /* Delay 250 usec */
  198 
  199                 /* Can't Short Circuit the next evaluation, so 'and' is last */
  200                 bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
  201                 DELAY(250);     /* Delay 250 usec */
  202 
  203                 valid = valid || bit;
  204 
  205                 if (i < 64)
  206                         sum = (sum >> 1) |
  207                                 (((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
  208 
  209                 data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
  210         }
  211 
  212         valid = valid && (data[8] == sum);
  213 
  214         return valid;
  215 }
  216 
  217 /*
  218  * Fill's the buffer with resource info from the device.
  219  * Returns the number of characters read.
  220  */
  221 static int
  222 pnp_get_resource_info(u_char *buffer, int len)
  223 {
  224         int i, j, count;
  225         u_char temp;
  226 
  227         count = 0;
  228         for (i = 0; i < len; i++) {
  229                 outb(_PNP_ADDRESS, PNP_STATUS);
  230                 for (j = 0; j < 100; j++) {
  231                         if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
  232                                 break;
  233                         DELAY(1);
  234                 }
  235                 if (j == 100) {
  236                         printf("PnP device failed to report resource data\n");
  237                         return count;
  238                 }
  239                 outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
  240                 temp = inb((pnp_rd_port << 2) | 0x3);
  241                 if (buffer != NULL)
  242                         buffer[i] = temp;
  243                 count++;
  244         }
  245         return count;
  246 }
  247 
  248 #if 0
  249 /*
  250  * write_pnp_parms initializes a logical device with the parms
  251  * in d, and then activates the board if the last parameter is 1.
  252  */
  253 
  254 static int
  255 write_pnp_parms(struct pnp_cinfo *d, pnp_id *p, int ldn)
  256 {
  257     int i, empty = -1 ;
  258 
  259     pnp_write (SET_LDN, ldn );
  260     i = pnp_read(SET_LDN) ;
  261     if (i != ldn) {
  262         printf("Warning: LDN %d does not exist\n", ldn);
  263     }
  264     for (i = 0; i < 8; i++) {
  265         pnp_write(IO_CONFIG_BASE + i * 2, d->ic_port[i] >> 8 );
  266         pnp_write(IO_CONFIG_BASE + i * 2 + 1, d->ic_port[i] & 0xff );
  267     }
  268     for (i = 0; i < 4; i++) {
  269         pnp_write(MEM_CONFIG + i*8, (d->ic_mem[i].base >> 16) & 0xff );
  270         pnp_write(MEM_CONFIG + i*8+1, (d->ic_mem[i].base >> 8) & 0xff );
  271         pnp_write(MEM_CONFIG + i*8+2, d->ic_mem[i].control & 0xff );
  272         pnp_write(MEM_CONFIG + i*8+3, (d->ic_mem[i].range >> 16) & 0xff );
  273         pnp_write(MEM_CONFIG + i*8+4, (d->ic_mem[i].range >> 8) & 0xff );
  274     }
  275     for (i = 0; i < 2; i++) {
  276         pnp_write(IRQ_CONFIG + i*2    , d->irq[i] );
  277         pnp_write(IRQ_CONFIG + i*2 + 1, d->irq_type[i] );
  278         pnp_write(DRQ_CONFIG + i, d->drq[i] );
  279     }
  280     /*
  281      * store parameters read into the current kernel
  282      * so manual editing next time is easier
  283      */
  284     for (i = 0 ; i < MAX_PNP_LDN; i++) {
  285         if (pnp_ldn_overrides[i].csn == d->csn &&
  286                 pnp_ldn_overrides[i].ldn == ldn) {
  287             d->flags = pnp_ldn_overrides[i].flags ;
  288             pnp_ldn_overrides[i] = *d ;
  289             break ;
  290         } else if (pnp_ldn_overrides[i].csn < 1 ||
  291                 pnp_ldn_overrides[i].csn == 255)
  292             empty = i ;
  293     }
  294     if (i== MAX_PNP_LDN && empty != -1)
  295         pnp_ldn_overrides[empty] = *d;
  296 
  297     /*
  298      * Here should really perform the range check, and
  299      * return a failure if not successful.
  300      */
  301     pnp_write (IO_RANGE_CHECK, 0);
  302     DELAY(1000); /* XXX is it really necessary ? */
  303     pnp_write (ACTIVATE, d->enable ? 1 : 0);
  304     DELAY(1000); /* XXX is it really necessary ? */
  305     return 1 ;
  306 }
  307 #endif
  308 
  309 /*
  310  * This function is called after the bus has assigned resource
  311  * locations for a logical device.
  312  */
  313 static void
  314 pnp_set_config(void *arg, struct isa_config *config, int enable)
  315 {
  316         int csn = ((struct pnp_set_config_arg *) arg)->csn;
  317         int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
  318         int i;
  319 
  320         /*
  321          * First put all cards into Sleep state with the initiation
  322          * key, then put our card into Config state.
  323          */
  324         pnp_send_initiation_key();
  325         pnp_write(PNP_WAKE, csn);
  326 
  327         /*
  328          * Select our logical device so that we can program it.
  329          */
  330         pnp_write(PNP_SET_LDN, ldn);
  331 
  332         /*
  333          * Constrain the number of resources we will try to program
  334          */
  335         if (config->ic_nmem > ISA_PNP_NMEM) {
  336             printf("too many ISA memory ranges (%d > %d)\n", config->ic_nmem, ISA_PNP_NMEM);
  337             config->ic_nmem = ISA_PNP_NMEM;
  338         }
  339         if (config->ic_nport > ISA_PNP_NPORT) {
  340             printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport, ISA_PNP_NPORT);
  341             config->ic_nport = ISA_PNP_NPORT;
  342         }
  343         if (config->ic_nirq > ISA_PNP_NIRQ) {
  344             printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq, ISA_PNP_NIRQ);
  345             config->ic_nirq = ISA_PNP_NIRQ;
  346         }
  347         if (config->ic_ndrq > ISA_PNP_NDRQ) {
  348             printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq, ISA_PNP_NDRQ);
  349             config->ic_ndrq = ISA_PNP_NDRQ;
  350         }
  351 
  352         /*
  353          * Now program the resources.
  354          */
  355         for (i = 0; i < config->ic_nmem; i++) {
  356                 u_int32_t start;
  357                 u_int32_t size;
  358 
  359                 /* XXX: should handle memory control register, 32 bit memory */
  360                 if (config->ic_mem[i].ir_size == 0) {
  361                         pnp_write(PNP_MEM_BASE_HIGH(i), 0);
  362                         pnp_write(PNP_MEM_BASE_LOW(i), 0);
  363                         pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
  364                         pnp_write(PNP_MEM_RANGE_LOW(i), 0);
  365                 } else {
  366                         start = config->ic_mem[i].ir_start;
  367                         size =  config->ic_mem[i].ir_size;
  368                         if (start & 0xff)
  369                                 panic("pnp_set_config: bogus memory assignment");
  370                         pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
  371                         pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
  372                         pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
  373                         pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
  374                 }
  375         }
  376         for (; i < ISA_PNP_NMEM; i++) {
  377                 pnp_write(PNP_MEM_BASE_HIGH(i), 0);
  378                 pnp_write(PNP_MEM_BASE_LOW(i), 0);
  379                 pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
  380                 pnp_write(PNP_MEM_RANGE_LOW(i), 0);
  381         }
  382 
  383         for (i = 0; i < config->ic_nport; i++) {
  384                 u_int32_t start;
  385 
  386                 if (config->ic_port[i].ir_size == 0) {
  387                         pnp_write(PNP_IO_BASE_HIGH(i), 0);
  388                         pnp_write(PNP_IO_BASE_LOW(i), 0);
  389                 } else {
  390                         start = config->ic_port[i].ir_start;
  391                         pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
  392                         pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
  393                 }
  394         }
  395         for (; i < ISA_PNP_NPORT; i++) {
  396                 pnp_write(PNP_IO_BASE_HIGH(i), 0);
  397                 pnp_write(PNP_IO_BASE_LOW(i), 0);
  398         }
  399 
  400         for (i = 0; i < config->ic_nirq; i++) {
  401                 int irq;
  402 
  403                 /* XXX: interrupt type */
  404                 if (config->ic_irqmask[i] == 0) {
  405                         pnp_write(PNP_IRQ_LEVEL(i), 0);
  406                         pnp_write(PNP_IRQ_TYPE(i), 2);
  407                 } else {
  408                         irq = ffs(config->ic_irqmask[i]) - 1;
  409                         pnp_write(PNP_IRQ_LEVEL(i), irq);
  410                         pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
  411                 }
  412         }
  413         for (; i < ISA_PNP_NIRQ; i++) {
  414                 /*
  415                  * IRQ 0 is not a valid interrupt selection and
  416                  * represents no interrupt selection.
  417                  */
  418                 pnp_write(PNP_IRQ_LEVEL(i), 0);
  419                 pnp_write(PNP_IRQ_TYPE(i), 2);
  420         }               
  421 
  422         for (i = 0; i < config->ic_ndrq; i++) {
  423                 int drq;
  424 
  425                 if (config->ic_drqmask[i] == 0) {
  426                         pnp_write(PNP_DMA_CHANNEL(i), 4);
  427                 } else {
  428                         drq = ffs(config->ic_drqmask[i]) - 1;
  429                         pnp_write(PNP_DMA_CHANNEL(i), drq);
  430                 }
  431         }
  432         for (; i < ISA_PNP_NDRQ; i++) {
  433                 /*
  434                  * DMA channel 4, the cascade channel is used to
  435                  * indicate no DMA channel is active.
  436                  */
  437                 pnp_write(PNP_DMA_CHANNEL(i), 4);
  438         }               
  439 
  440         pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
  441 
  442         /*
  443          * Wake everyone up again, we are finished.
  444          */
  445         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  446 }
  447 
  448 /*
  449  * Process quirks for a logical device.. The card must be in Config state.
  450  */
  451 void
  452 pnp_check_quirks(u_int32_t vendor_id, u_int32_t logical_id, int ldn, struct isa_config *config)
  453 {
  454         struct pnp_quirk *qp;
  455 
  456         for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
  457                 if (qp->vendor_id == vendor_id
  458                     && (qp->logical_id == 0
  459                         || qp->logical_id == logical_id)) {
  460                         switch (qp->type) {
  461                         case PNP_QUIRK_WRITE_REG:
  462                                 pnp_write(PNP_SET_LDN, ldn);
  463                                 pnp_write(qp->arg1, qp->arg2);
  464                                 break;
  465                         case PNP_QUIRK_EXTRA_IO:
  466                                 if (config == NULL)
  467                                         break;
  468                                 if (qp->arg1 != 0) {
  469                                         config->ic_nport++;
  470                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
  471                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
  472                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
  473                                 }
  474                                 if (qp->arg2 != 0) {
  475                                         config->ic_nport++;
  476                                         config->ic_port[config->ic_nport - 1] = config->ic_port[0];
  477                                         config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
  478                                         config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
  479                                 }
  480                                 break;
  481                         }
  482                 }
  483         }
  484 }
  485 
  486 /*
  487  * Scan Resource Data for Logical Devices.
  488  *
  489  * This function exits as soon as it gets an error reading *ANY*
  490  * Resource Data or it reaches the end of Resource Data.  In the first
  491  * case the return value will be TRUE, FALSE otherwise.
  492  */
  493 static int
  494 pnp_create_devices(device_t parent, pnp_id *p, int csn,
  495                    u_char *resources, int len)
  496 {
  497         u_char tag, *resp, *resinfo, *startres = 0;
  498         int large_len, scanning = len, retval = FALSE;
  499         u_int32_t logical_id;
  500         u_int32_t compat_id;
  501         device_t dev = 0;
  502         int ldn = 0;
  503         struct pnp_set_config_arg *csnldn;
  504         char buf[100];
  505         char *desc = 0;
  506 
  507         resp = resources;
  508         while (scanning > 0) {
  509                 tag = *resp++;
  510                 scanning--;
  511                 if (PNP_RES_TYPE(tag) != 0) {
  512                         /* Large resource */
  513                         if (scanning < 2) {
  514                                 scanning = 0;
  515                                 continue;
  516                         }
  517                         large_len = resp[0] + (resp[1] << 8);
  518                         resp += 2;
  519 
  520                         if (scanning < large_len) {
  521                                 scanning = 0;
  522                                 continue;
  523                         }
  524                         resinfo = resp;
  525                         resp += large_len;
  526                         scanning -= large_len;
  527 
  528                         if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
  529                                 if (dev) {
  530                                         /*
  531                                          * This is an optional device
  532                                          * indentifier string. Skipt it
  533                                          * for now.
  534                                          */
  535                                         continue;
  536                                 }
  537                                 /* else mandately card identifier string */
  538                                 if (large_len > sizeof(buf) - 1)
  539                                         large_len = sizeof(buf) - 1;
  540                                 bcopy(resinfo, buf, large_len);
  541 
  542                                 /*
  543                                  * Trim trailing spaces.
  544                                  */
  545                                 while (buf[large_len-1] == ' ')
  546                                         large_len--;
  547                                 buf[large_len] = '\0';
  548                                 desc = buf;
  549                                 continue;
  550                         }
  551 
  552                         continue;
  553                 }
  554                 
  555                 /* Small resource */
  556                 if (scanning < PNP_SRES_LEN(tag)) {
  557                         scanning = 0;
  558                         continue;
  559                 }
  560                 resinfo = resp;
  561                 resp += PNP_SRES_LEN(tag);
  562                 scanning -= PNP_SRES_LEN(tag);;
  563                         
  564                 switch (PNP_SRES_NUM(tag)) {
  565                 case PNP_TAG_LOGICAL_DEVICE:
  566                         /*
  567                          * Parse the resources for the previous
  568                          * logical device (if any).
  569                          */
  570                         if (startres) {
  571                                 pnp_parse_resources(dev, startres,
  572                                                     resinfo - startres - 1,
  573                                                     ldn);
  574                                 dev = 0;
  575                                 startres = 0;
  576                         }
  577 
  578                         /* 
  579                          * A new logical device. Scan for end of
  580                          * resources.
  581                          */
  582                         bcopy(resinfo, &logical_id, 4);
  583                         pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
  584                         compat_id = 0;
  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                         return ENOMEM;
  669                 bcopy(resources, newres, len);
  670                 free(resources, M_TEMP);
  671                 resources = newres;
  672                 space += extra;
  673         }
  674 
  675         if (pnp_get_resource_info(resources + len, amount) != amount)
  676                 return EINVAL;
  677         len += amount;
  678 
  679         *resourcesp = resources;
  680         *spacep = space;
  681         *lenp = len;
  682 
  683         return 0;
  684 }
  685 
  686 /*
  687  * Read all resources from the card, allocating memory as needed. If a
  688  * buffer is already available, it should be passed in '*resourcesp'
  689  * and its length in '*spacep'. The memory allocated will be returned
  690  * in '*resourcesp' with its size and the number of bytes of resources
  691  * in '*spacep' and '*lenp' respectively.
  692  */
  693 static int
  694 pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
  695 {
  696         u_char *resources = *resourcesp;
  697         int space = *spacep;
  698         int len = 0;
  699         int error, done;
  700         u_char tag;
  701 
  702         error = 0;
  703         done = 0;
  704         while (!done) {
  705                 error = pnp_read_bytes(1, &resources, &space, &len);
  706                 if (error)
  707                         goto out;
  708                 tag = resources[len-1];
  709                 if (PNP_RES_TYPE(tag) == 0) {
  710                         /*
  711                          * Small resource, read contents.
  712                          */
  713                         error = pnp_read_bytes(PNP_SRES_LEN(tag),
  714                                                &resources, &space, &len);
  715                         if (error)
  716                                 goto out;
  717                         if (PNP_SRES_NUM(tag) == PNP_TAG_END)
  718                                 done = 1;
  719                 } else {
  720                         /*
  721                          * Large resource, read length and contents.
  722                          */
  723                         error = pnp_read_bytes(2, &resources, &space, &len);
  724                         if (error)
  725                                 goto out;
  726                         error = pnp_read_bytes(resources[len-2]
  727                                                + (resources[len-1] << 8),
  728                                                &resources, &space, &len);
  729                         if (error)
  730                                 goto out;
  731                 }
  732         }
  733 
  734  out:
  735         *resourcesp = resources;
  736         *spacep = space;
  737         *lenp = len;
  738         return error;
  739 }
  740 
  741 /*
  742  * Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
  743  * value (caller should try multiple READ_DATA locations before giving
  744  * up). Upon exiting, all cards are aware that they should use
  745  * pnp_rd_port as the READ_DATA port.
  746  *
  747  * In the first pass, a csn is assigned to each board and pnp_id's
  748  * are saved to an array, pnp_devices. In the second pass, each
  749  * card is woken up and the device configuration is called.
  750  */
  751 static int
  752 pnp_isolation_protocol(device_t parent)
  753 {
  754         int csn;
  755         pnp_id id;
  756         int found = 0, len;
  757         u_char *resources = 0;
  758         int space = 0;
  759         int error;
  760 #ifdef PC98
  761         int n, necpnp;
  762         u_char buffer[10];
  763 #endif
  764 
  765         /*
  766          * Put all cards into the Sleep state so that we can clear
  767          * their CSNs.
  768          */
  769         pnp_send_initiation_key();
  770 
  771         /*
  772          * Clear the CSN for all cards.
  773          */
  774         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
  775 
  776         /*
  777          * Move all cards to the Isolation state.
  778          */
  779         pnp_write(PNP_WAKE, 0);
  780 
  781         /*
  782          * Tell them where the read point is going to be this time.
  783          */
  784         pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
  785 
  786         for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
  787                 /*
  788                  * Start the serial isolation protocol.
  789                  */
  790                 outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
  791                 DELAY(1000);    /* Delay 1 msec */
  792 
  793                 if (pnp_get_serial(&id)) {
  794                         /*
  795                          * We have read the id from a card
  796                          * successfully. The card which won the
  797                          * isolation protocol will be in Isolation
  798                          * mode and all others will be in Sleep.
  799                          * Program the CSN of the isolated card
  800                          * (taking it to Config state) and read its
  801                          * resources, creating devices as we find
  802                          * logical devices on the card.
  803                          */
  804                         pnp_write(PNP_SET_CSN, csn);
  805 #ifdef PC98
  806                         if (bootverbose)
  807                                 printf("PnP Vendor ID = %x\n", id.vendor_id);
  808                         /* Check for NEC PnP (9 bytes serial). */
  809                         for (n = necpnp = 0; necids[n].vendor_id; n++) {
  810                                 if (id.vendor_id == necids[n].vendor_id) {
  811                                         necpnp = 1;
  812                                         break;
  813                                 }
  814                         }
  815                         if (necpnp) {
  816                                 if (bootverbose)
  817                                         printf("It seems to NEC-PnP card (%s).\n",
  818                                                pnp_eisaformat(id.vendor_id));
  819                                 /*  Read dummy 9 bytes serial area. */
  820                                 pnp_get_resource_info(buffer, 9);
  821                         } else {
  822                                 if (bootverbose)
  823                                         printf("It seems to Normal-ISA-PnP card (%s).\n",
  824                                                pnp_eisaformat(id.vendor_id));
  825                         }
  826                         if (bootverbose)
  827                                 printf("Reading PnP configuration for %s.\n",
  828                                        pnp_eisaformat(id.vendor_id));
  829 #endif
  830                         error = pnp_read_resources(&resources,
  831                                                    &space,
  832                                                    &len);
  833                         if (error)
  834                                 break;
  835                         pnp_create_devices(parent, &id, csn,
  836                                            resources, len);
  837                         found++;
  838                 } else
  839                         break;
  840 
  841                 /*
  842                  * Put this card back to the Sleep state and
  843                  * simultaneously move all cards which don't have a
  844                  * CSN yet to Isolation state.
  845                  */
  846                 pnp_write(PNP_WAKE, 0);
  847         }
  848 
  849         /*
  850          * Unless we have chosen the wrong read port, all cards will
  851          * be in Sleep state. Put them back into WaitForKey for
  852          * now. Their resources will be programmed later.
  853          */
  854         pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
  855 
  856         /*
  857          * Cleanup.
  858          */
  859         if (resources)
  860                 free(resources, M_TEMP);
  861 
  862         return found;
  863 }
  864 
  865 
  866 /*
  867  * pnp_identify()
  868  *
  869  * autoconfiguration of pnp devices. This routine just runs the
  870  * isolation protocol over several ports, until one is successful.
  871  *
  872  * may be called more than once ?
  873  *
  874  */
  875 
  876 static void
  877 pnp_identify(driver_t *driver, device_t parent)
  878 {
  879         int num_pnp_devs;
  880 
  881 #if 0
  882         if (pnp_ldn_overrides[0].csn == 0) {
  883                 if (bootverbose)
  884                         printf("Initializing PnP override table\n");
  885                 bzero (pnp_ldn_overrides, sizeof(pnp_ldn_overrides));
  886                 pnp_ldn_overrides[0].csn = 255 ;
  887         }
  888 #endif
  889 
  890         /* Try various READ_DATA ports from 0x203-0x3ff */
  891         for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
  892                 if (bootverbose)
  893                         printf("Trying Read_Port at %x\n", (pnp_rd_port << 2) | 0x3);
  894 
  895                 num_pnp_devs = pnp_isolation_protocol(parent);
  896                 if (num_pnp_devs)
  897                         break;
  898         }
  899 }
  900 
  901 static device_method_t pnp_methods[] = {
  902         /* Device interface */
  903         DEVMETHOD(device_identify,      pnp_identify),
  904 
  905         { 0, 0 }
  906 };
  907 
  908 static driver_t pnp_driver = {
  909         "pnp",
  910         pnp_methods,
  911         1,                      /* no softc */
  912 };
  913 
  914 static devclass_t pnp_devclass;
  915 
  916 DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);

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