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init.c

/*
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include "includes.h"
#include "hardware.h"
#include "card.h"

MODULE_DESCRIPTION("ISDN4Linux: Driver for Spellcaster card");
MODULE_AUTHOR("Spellcaster Telecommunications Inc.");
MODULE_LICENSE("GPL");

board *sc_adapter[MAX_CARDS];
int cinst;

static char devname[] = "scX";
static const char version[] = "2.0b1";

static const char *boardname[] = { "DataCommute/BRI", "DataCommute/PRI", "TeleCommute/BRI" };

/* insmod set parameters */
static unsigned int io[] = {0,0,0,0};
static unsigned char irq[] = {0,0,0,0};
static unsigned long ram[] = {0,0,0,0};
static int do_reset = 0;

module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param_array(ram, int, NULL, 0);
module_param(do_reset, bool, 0);

static int identify_board(unsigned long, unsigned int);

static int __init sc_init(void)
{
      int b = -1;
      int i, j;
      int status = -ENODEV;

      unsigned long memsize = 0;
      unsigned long features = 0;
      isdn_if *interface;
      unsigned char channels;
      unsigned char pgport;
      unsigned long magic;
      int model;
      int last_base = IOBASE_MIN;
      int probe_exhasted = 0;

#ifdef MODULE
      pr_info("SpellCaster ISA ISDN Adapter Driver rev. %s Loaded\n", version);
#else
      pr_info("SpellCaster ISA ISDN Adapter Driver rev. %s\n", version);
#endif
      pr_info("Copyright (C) 1996 SpellCaster Telecommunications Inc.\n");

      while(b++ < MAX_CARDS - 1) {
            pr_debug("Probing for adapter #%d\n", b);
            /*
             * Initialize reusable variables
             */
            model = -1;
            magic = 0;
            channels = 0;
            pgport = 0;

            /* 
             * See if we should probe for IO base 
             */
            pr_debug("I/O Base for board %d is 0x%x, %s probe\n", b, io[b],
                  io[b] == 0 ? "will" : "won't");
            if(io[b]) {
                  /*
                   * No, I/O Base has been provided
                   */
                  for (i = 0 ; i < MAX_IO_REGS - 1 ; i++) {
                        if(!request_region(io[b] + i * 0x400, 1, "sc test")) {
                              pr_debug("request_region for 0x%x failed\n", io[b] + i * 0x400);
                              io[b] = 0;
                              break;
                        } else
                              release_region(io[b] + i * 0x400, 1);
                  }

                  /*
                   * Confirm the I/O Address with a test
                   */
                  if(io[b] == 0) {
                        pr_debug("I/O Address invalid.\n");
                        continue;
                  }

                  outb(0x18, io[b] + 0x400 * EXP_PAGE0);
                  if(inb(io[b] + 0x400 * EXP_PAGE0) != 0x18) {
                        pr_debug("I/O Base 0x%x fails test\n",
                               io[b] + 0x400 * EXP_PAGE0);
                        continue;
                  }
            }
            else {
                  /*
                   * Yes, probe for I/O Base
                   */
                  if(probe_exhasted) {
                        pr_debug("All probe addresses exhasted, skipping\n");
                        continue;
                  }
                  pr_debug("Probing for I/O...\n");
                  for (i = last_base ; i <= IOBASE_MAX ; i += IOBASE_OFFSET) {
                        int found_io = 1;
                        if (i == IOBASE_MAX) {
                              probe_exhasted = 1; /* No more addresses to probe */
                              pr_debug("End of Probes\n");
                        }
                        last_base = i + IOBASE_OFFSET;
                        pr_debug("  checking 0x%x...", i);
                        for ( j = 0 ; j < MAX_IO_REGS - 1 ; j++) {
                              if(!request_region(i + j * 0x400, 1, "sc test")) {
                                    pr_debug("Failed\n");
                                    found_io = 0;
                                    break;
                              } else
                                    release_region(i + j * 0x400, 1);
                        }     

                        if(found_io) {
                              io[b] = i;
                              outb(0x18, io[b] + 0x400 * EXP_PAGE0);
                              if(inb(io[b] + 0x400 * EXP_PAGE0) != 0x18) { 
                                    pr_debug("Failed by test\n");
                                    continue;
                              }
                              pr_debug("Passed\n");
                              break;
                        }
                  }
                  if(probe_exhasted) {
                        continue;
                  }
            }

            /*
             * See if we should probe for shared RAM
             */
            if(do_reset) {
                  pr_debug("Doing a SAFE probe reset\n");
                  outb(0xFF, io[b] + RESET_OFFSET);
                  msleep_interruptible(10000);
            }
            pr_debug("RAM Base for board %d is 0x%lx, %s probe\n", b,
                  ram[b], ram[b] == 0 ? "will" : "won't");

            if(ram[b]) {
                  /*
                   * No, the RAM base has been provided
                   * Just look for a signature and ID the
                   * board model
                   */
                  if(request_region(ram[b], SRAM_PAGESIZE, "sc test")) {
                        pr_debug("request_region for RAM base 0x%lx succeeded\n", ram[b]);
                        model = identify_board(ram[b], io[b]);
                        release_region(ram[b], SRAM_PAGESIZE);
                  }
            }
            else {
                  /*
                   * Yes, probe for free RAM and look for
                   * a signature and id the board model
                   */
                  for (i = SRAM_MIN ; i < SRAM_MAX ; i += SRAM_PAGESIZE) {
                        pr_debug("Checking RAM address 0x%x...\n", i);
                        if(request_region(i, SRAM_PAGESIZE, "sc test")) {
                              pr_debug("  request_region succeeded\n");
                              model = identify_board(i, io[b]);
                              release_region(i, SRAM_PAGESIZE);
                              if (model >= 0) {
                                    pr_debug("  Identified a %s\n",
                                          boardname[model]);
                                    ram[b] = i;
                                    break;
                              }
                              pr_debug("  Unidentifed or inaccessible\n");
                              continue;
                        }
                        pr_debug("  request failed\n");
                  }
            }
            /*
             * See if we found free RAM and the board model
             */
            if(!ram[b] || model < 0) {
                  /*
                   * Nope, there was no place in RAM for the
                   * board, or it couldn't be identified
                   */
                   pr_debug("Failed to find an adapter at 0x%lx\n", ram[b]);
                   continue;
            }

            /*
             * Set the board's magic number, memory size and page register
             */
            switch(model) {
            case PRI_BOARD:
                  channels = 23;
                  magic = 0x20000;
                  memsize = 0x100000;
                  features = PRI_FEATURES;
                  break;

            case BRI_BOARD:
            case POTS_BOARD:
                  channels = 2;
                  magic = 0x60000;
                  memsize = 0x10000;
                  features = BRI_FEATURES;
                  break;
            }
            switch(ram[b] >> 12 & 0x0F) {
            case 0x0:
                  pr_debug("RAM Page register set to EXP_PAGE0\n");
                  pgport = EXP_PAGE0;
                  break;

            case 0x4:
                  pr_debug("RAM Page register set to EXP_PAGE1\n");
                  pgport = EXP_PAGE1;
                  break;

            case 0x8:
                  pr_debug("RAM Page register set to EXP_PAGE2\n");
                  pgport = EXP_PAGE2;
                  break;

            case 0xC:
                  pr_debug("RAM Page register set to EXP_PAGE3\n");
                  pgport = EXP_PAGE3;
                  break;

            default:
                  pr_debug("RAM base address doesn't fall on 16K boundary\n");
                  continue;
            }

            pr_debug("current IRQ: %d  b: %d\n",irq[b],b);

            /*
             * Make sure we got an IRQ
             */
            if(!irq[b]) {
                  /*
                   * No interrupt could be used
                   */
                  pr_debug("Failed to acquire an IRQ line\n");
                  continue;
            }

            /*
             * Horray! We found a board, Make sure we can register
             * it with ISDN4Linux
             */
            interface = kzalloc(sizeof(isdn_if), GFP_KERNEL);
            if (interface == NULL) {
                  /*
                   * Oops, can't malloc isdn_if
                   */
                  continue;
            }

            interface->owner = THIS_MODULE;
            interface->hl_hdrlen = 0;
            interface->channels = channels;
            interface->maxbufsize = BUFFER_SIZE;
            interface->features = features;
            interface->writebuf_skb = sndpkt;
            interface->writecmd = NULL;
            interface->command = command;
            strcpy(interface->id, devname);
            interface->id[2] = '0' + cinst;

            /*
             * Allocate the board structure
             */
            sc_adapter[cinst] = kzalloc(sizeof(board), GFP_KERNEL);
            if (sc_adapter[cinst] == NULL) {
                  /*
                   * Oops, can't alloc memory for the board
                   */
                  kfree(interface);
                  continue;
            }
            spin_lock_init(&sc_adapter[cinst]->lock);

            if(!register_isdn(interface)) {
                  /*
                   * Oops, couldn't register for some reason
                   */
                  kfree(interface);
                  kfree(sc_adapter[cinst]);
                  continue;
            }

            sc_adapter[cinst]->card = interface;
            sc_adapter[cinst]->driverId = interface->channels;
            strcpy(sc_adapter[cinst]->devicename, interface->id);
            sc_adapter[cinst]->nChannels = channels;
            sc_adapter[cinst]->ramsize = memsize;
            sc_adapter[cinst]->shmem_magic = magic;
            sc_adapter[cinst]->shmem_pgport = pgport;
            sc_adapter[cinst]->StartOnReset = 1;

            /*
             * Allocate channels status structures
             */
            sc_adapter[cinst]->channel = kzalloc(sizeof(bchan) * channels, GFP_KERNEL);
            if (sc_adapter[cinst]->channel == NULL) {
                  /*
                   * Oops, can't alloc memory for the channels
                   */
                  indicate_status(cinst, ISDN_STAT_UNLOAD, 0, NULL);    /* Fix me */
                  kfree(interface);
                  kfree(sc_adapter[cinst]);
                  continue;
            }

            /*
             * Lock down the hardware resources
             */
            sc_adapter[cinst]->interrupt = irq[b];
            if (request_irq(sc_adapter[cinst]->interrupt, interrupt_handler,
                        IRQF_DISABLED, interface->id,
                        (void *)(unsigned long) cinst))
            {
                  kfree(sc_adapter[cinst]->channel);
                  indicate_status(cinst, ISDN_STAT_UNLOAD, 0, NULL);    /* Fix me */
                  kfree(interface);
                  kfree(sc_adapter[cinst]);
                  continue;
                  
            }
            sc_adapter[cinst]->iobase = io[b];
            for(i = 0 ; i < MAX_IO_REGS - 1 ; i++) {
                  sc_adapter[cinst]->ioport[i] = io[b] + i * 0x400;
                  request_region(sc_adapter[cinst]->ioport[i], 1,
                              interface->id);
                  pr_debug("Requesting I/O Port %#x\n",
                        sc_adapter[cinst]->ioport[i]);
            }
            sc_adapter[cinst]->ioport[IRQ_SELECT] = io[b] + 0x2;
            request_region(sc_adapter[cinst]->ioport[IRQ_SELECT], 1,
                        interface->id);
            pr_debug("Requesting I/O Port %#x\n",
                        sc_adapter[cinst]->ioport[IRQ_SELECT]);
            sc_adapter[cinst]->rambase = ram[b];
            request_region(sc_adapter[cinst]->rambase, SRAM_PAGESIZE,
                        interface->id);

            pr_info("  %s (%d) - %s %d channels IRQ %d, I/O Base 0x%x, RAM Base 0x%lx\n", 
                  sc_adapter[cinst]->devicename,
                  sc_adapter[cinst]->driverId,
                  boardname[model], channels, irq[b], io[b], ram[b]);
            
            /*
             * reset the adapter to put things in motion
             */
            reset(cinst);

            cinst++;
            status = 0;
      }
      if (status) 
            pr_info("Failed to find any adapters, driver unloaded\n");
      return status;
}

static void __exit sc_exit(void)
{
      int i, j;

      for(i = 0 ; i < cinst ; i++) {
            pr_debug("Cleaning up after adapter %d\n", i);
            /*
             * kill the timers
             */
            del_timer(&(sc_adapter[i]->reset_timer));
            del_timer(&(sc_adapter[i]->stat_timer));

            /*
             * Tell I4L we're toast
             */
            indicate_status(i, ISDN_STAT_STOP, 0, NULL);
            indicate_status(i, ISDN_STAT_UNLOAD, 0, NULL);

            /*
             * Release shared RAM
             */
            release_region(sc_adapter[i]->rambase, SRAM_PAGESIZE);

            /*
             * Release the IRQ
             */
            free_irq(sc_adapter[i]->interrupt, NULL);

            /*
             * Reset for a clean start
             */
            outb(0xFF, sc_adapter[i]->ioport[SFT_RESET]);

            /*
             * Release the I/O Port regions
             */
            for(j = 0 ; j < MAX_IO_REGS - 1; j++) {
                  release_region(sc_adapter[i]->ioport[j], 1);
                  pr_debug("Releasing I/O Port %#x\n",
                        sc_adapter[i]->ioport[j]);
            }
            release_region(sc_adapter[i]->ioport[IRQ_SELECT], 1);
            pr_debug("Releasing I/O Port %#x\n",
                  sc_adapter[i]->ioport[IRQ_SELECT]);

            /*
             * Release any memory we alloced
             */
            kfree(sc_adapter[i]->channel);
            kfree(sc_adapter[i]->card);
            kfree(sc_adapter[i]);
      }
      pr_info("SpellCaster ISA ISDN Adapter Driver Unloaded.\n");
}

static int identify_board(unsigned long rambase, unsigned int iobase)
{
      unsigned int pgport;
      unsigned long sig;
      DualPortMemory *dpm;
      RspMessage rcvmsg;
      ReqMessage sndmsg;
      HWConfig_pl hwci;
      int x;

      pr_debug("Attempting to identify adapter @ 0x%lx io 0x%x\n",
            rambase, iobase);

      /*
       * Enable the base pointer
       */
      outb(rambase >> 12, iobase + 0x2c00);

      switch(rambase >> 12 & 0x0F) {
      case 0x0:
            pgport = iobase + PG0_OFFSET;
            pr_debug("Page Register offset is 0x%x\n", PG0_OFFSET);
            break;
            
      case 0x4:
            pgport = iobase + PG1_OFFSET;
            pr_debug("Page Register offset is 0x%x\n", PG1_OFFSET);
            break;

      case 0x8:
            pgport = iobase + PG2_OFFSET;
            pr_debug("Page Register offset is 0x%x\n", PG2_OFFSET);
            break;

      case 0xC:
            pgport = iobase + PG3_OFFSET;
            pr_debug("Page Register offset is 0x%x\n", PG3_OFFSET);
            break;
      default:
            pr_debug("Invalid rambase 0x%lx\n", rambase);
            return -1;
      }

      /*
       * Try to identify a PRI card
       */
      outb(PRI_BASEPG_VAL, pgport);
      msleep_interruptible(1000);
      sig = readl(rambase + SIG_OFFSET);
      pr_debug("Looking for a signature, got 0x%lx\n", sig);
      if(sig == SIGNATURE)
            return PRI_BOARD;

      /*
       * Try to identify a PRI card
       */
      outb(BRI_BASEPG_VAL, pgport);
      msleep_interruptible(1000);
      sig = readl(rambase + SIG_OFFSET);
      pr_debug("Looking for a signature, got 0x%lx\n", sig);
      if(sig == SIGNATURE)
            return BRI_BOARD;

      return -1;

      /*
       * Try to spot a card
       */
      sig = readl(rambase + SIG_OFFSET);
      pr_debug("Looking for a signature, got 0x%lx\n", sig);
      if(sig != SIGNATURE)
            return -1;

      dpm = (DualPortMemory *) rambase;

      memset(&sndmsg, 0, MSG_LEN);
      sndmsg.msg_byte_cnt = 3;
      sndmsg.type = cmReqType1;
      sndmsg.class = cmReqClass0;
      sndmsg.code = cmReqHWConfig;
      memcpy_toio(&(dpm->req_queue[dpm->req_head++]), &sndmsg, MSG_LEN);
      outb(0, iobase + 0x400);
      pr_debug("Sent HWConfig message\n");
      /*
       * Wait for the response
       */
      x = 0;
      while((inb(iobase + FIFOSTAT_OFFSET) & RF_HAS_DATA) && x < 100) {
            schedule_timeout_interruptible(1);
            x++;
      }
      if(x == 100) {
            pr_debug("Timeout waiting for response\n");
            return -1;
      }

      memcpy_fromio(&rcvmsg, &(dpm->rsp_queue[dpm->rsp_tail]), MSG_LEN);
      pr_debug("Got HWConfig response, status = 0x%x\n", rcvmsg.rsp_status);
      memcpy(&hwci, &(rcvmsg.msg_data.HWCresponse), sizeof(HWConfig_pl));
      pr_debug("Hardware Config: Interface: %s, RAM Size: %ld, Serial: %s\n"
             "                 Part: %s, Rev: %s\n",
             hwci.st_u_sense ? "S/T" : "U", hwci.ram_size,
             hwci.serial_no, hwci.part_no, hwci.rev_no);

      if(!strncmp(PRI_PARTNO, hwci.part_no, 6))
            return PRI_BOARD;
      if(!strncmp(BRI_PARTNO, hwci.part_no, 6))
            return BRI_BOARD;
            
      return -1;
}

module_init(sc_init);
module_exit(sc_exit);

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