drivers/isdn/hysdn/boardergo.c

   1 /* $Id: boardergo.c,v 1.5.6.7 2001/11/06 21:58:19 kai Exp $
   2  *
   3  * Linux driver for HYSDN cards, specific routines for ergo type boards.
   4  *
   5  * Author    Werner Cornelius (werner@titro.de) for Hypercope GmbH
   6  * Copyright 1999 by Werner Cornelius (werner@titro.de)
   7  *
   8  * This software may be used and distributed according to the terms
   9  * of the GNU General Public License, incorporated herein by reference.
  10  *
  11  * As all Linux supported cards Champ2, Ergo and Metro2/4 use the same
  12  * DPRAM interface and layout with only minor differences all related
  13  * stuff is done here, not in separate modules.
  14  *
  15  */
  16
  17 #include <linux/sched.h>
  18 #include <linux/signal.h>
  19 #include <linux/kernel.h>
  20 #include <linux/ioport.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/delay.h>
  24 #include <asm/io.h>
  25
  26 #include "hysdn_defs.h"
  27 #include "boardergo.h"
  28
  29 #define byteout(addr,val) outb(val,addr)
  30 #define bytein(addr) inb(addr)
  31
  32 /***************************************************/
  33 /* The cards interrupt handler. Called from system */
  34 /***************************************************/
  35 static irqreturn_t
  36 ergo_interrupt(int intno, void *dev_id, struct pt_regs *regs)
  37 {
  38         hysdn_card *card = dev_id;      /* parameter from irq */
  39         tErgDpram *dpr;
  40         unsigned long flags;
  41         unsigned char volatile b;
  42
  43         if (!card)
  44                 return IRQ_NONE;                /* error -> spurious interrupt */
  45         if (!card->irq_enabled)
  46                 return IRQ_NONE;                /* other device interrupting or irq switched off */
  47
  48         save_flags(flags);
  49         cli();                  /* no further irqs allowed */
  50
  51         if (!(bytein(card->iobase + PCI9050_INTR_REG) & PCI9050_INTR_REG_STAT1)) {
  52                 restore_flags(flags);   /* restore old state */
  53                 return IRQ_NONE;                /* no interrupt requested by E1 */
  54         }
  55         /* clear any pending ints on the board */
  56         dpr = card->dpram;
  57         b = dpr->ToPcInt;       /* clear for ergo */
  58         b |= dpr->ToPcIntMetro; /* same for metro */
  59         b |= dpr->ToHyInt;      /* and for champ */
  60
  61         /* start kernel task immediately after leaving all interrupts */
  62         if (!card->hw_lock)
  63                 schedule_work(&card->irq_queue);
  64         restore_flags(flags);
  65         return IRQ_HANDLED;
  66 }                               /* ergo_interrupt */
  67
  68 /******************************************************************************/
  69 /* ergo_irq_bh is the function called by the immediate kernel task list after */
  70 /* being activated with queue_task and no interrupts active. This task is the */
  71 /* only one handling data transfer from or to the card after booting. The task */
  72 /* may be queued from everywhere (interrupts included).                       */
  73 /******************************************************************************/
  74 static void
  75 ergo_irq_bh(hysdn_card * card)
  76 {
  77         tErgDpram *dpr;
  78         int again;
  79         unsigned long flags;
  80
  81         if (card->state != CARD_STATE_RUN)
  82                 return;         /* invalid call */
  83
  84         dpr = card->dpram;      /* point to DPRAM */
  85
  86         save_flags(flags);
  87         cli();
  88         if (card->hw_lock) {
  89                 restore_flags(flags);   /* hardware currently unavailable */
  90                 return;
  91         }
  92         card->hw_lock = 1;      /* we now lock the hardware */
  93
  94         do {
  95                 sti();          /* reenable other ints */
  96                 again = 0;      /* assume loop not to be repeated */
  97
  98                 if (!dpr->ToHyFlag) {
  99                         /* we are able to send a buffer */
 100
 101                         if (hysdn_sched_tx(card, dpr->ToHyBuf, &dpr->ToHySize, &dpr->ToHyChannel,
 102                                            ERG_TO_HY_BUF_SIZE)) {
 103                                 dpr->ToHyFlag = 1;      /* enable tx */
 104                                 again = 1;      /* restart loop */
 105                         }
 106                 }               /* we are able to send a buffer */
 107                 if (dpr->ToPcFlag) {
 108                         /* a message has arrived for us, handle it */
 109
 110                         if (hysdn_sched_rx(card, dpr->ToPcBuf, dpr->ToPcSize, dpr->ToPcChannel)) {
 111                                 dpr->ToPcFlag = 0;      /* we worked the data */
 112                                 again = 1;      /* restart loop */
 113                         }
 114                 }               /* a message has arrived for us */
 115                 cli();          /* no further ints */
 116                 if (again) {
 117                         dpr->ToHyInt = 1;
 118                         dpr->ToPcInt = 1;       /* interrupt to E1 for all cards */
 119                 } else
 120                         card->hw_lock = 0;      /* free hardware again */
 121         } while (again);        /* until nothing more to do */
 122
 123         restore_flags(flags);
 124 }                               /* ergo_irq_bh */
 125
 126
 127 /*********************************************************/
 128 /* stop the card (hardware reset) and disable interrupts */
 129 /*********************************************************/
 130 static void
 131 ergo_stopcard(hysdn_card * card)
 132 {
 133         unsigned long flags;
 134         unsigned char val;
 135
 136         hysdn_net_release(card);        /* first release the net device if existing */
 137 #ifdef CONFIG_HYSDN_CAPI
 138         hycapi_capi_stop(card);
 139 #endif /* CONFIG_HYSDN_CAPI */
 140         save_flags(flags);
 141         cli();
 142         val = bytein(card->iobase + PCI9050_INTR_REG);  /* get actual value */
 143         val &= ~(PCI9050_INTR_REG_ENPCI | PCI9050_INTR_REG_EN1);        /* mask irq */
 144         byteout(card->iobase + PCI9050_INTR_REG, val);
 145         card->irq_enabled = 0;
 146         byteout(card->iobase + PCI9050_USER_IO, PCI9050_E1_RESET);      /* reset E1 processor */
 147         card->state = CARD_STATE_UNUSED;
 148         card->err_log_state = ERRLOG_STATE_OFF;         /* currently no log active */
 149
 150         restore_flags(flags);
 151 }                               /* ergo_stopcard */
 152
 153 /**************************************************************************/
 154 /* enable or disable the cards error log. The event is queued if possible */
 155 /**************************************************************************/
 156 static void
 157 ergo_set_errlog_state(hysdn_card * card, int on)
 158 {
 159         unsigned long flags;
 160
 161         if (card->state != CARD_STATE_RUN) {
 162                 card->err_log_state = ERRLOG_STATE_OFF;         /* must be off */
 163                 return;
 164         }
 165         save_flags(flags);
 166         cli();
 167
 168         if (((card->err_log_state == ERRLOG_STATE_OFF) && !on) ||
 169             ((card->err_log_state == ERRLOG_STATE_ON) && on)) {
 170                 restore_flags(flags);
 171                 return;         /* nothing to do */
 172         }
 173         if (on)
 174                 card->err_log_state = ERRLOG_STATE_START;       /* request start */
 175         else
 176                 card->err_log_state = ERRLOG_STATE_STOP;        /* request stop */
 177
 178         restore_flags(flags);
 179         schedule_work(&card->irq_queue);
 180 }                               /* ergo_set_errlog_state */
 181
 182 /******************************************/
 183 /* test the cards RAM and return 0 if ok. */
 184 /******************************************/
 185 static const char TestText[36] = "This Message is filler, why read it";
 186
 187 static int
 188 ergo_testram(hysdn_card * card)
 189 {
 190         tErgDpram *dpr = card->dpram;
 191
 192         memset(dpr->TrapTable, 0, sizeof(dpr->TrapTable));      /* clear all Traps */
 193         dpr->ToHyInt = 1;       /* E1 INTR state forced */
 194
 195         memcpy(&dpr->ToHyBuf[ERG_TO_HY_BUF_SIZE - sizeof(TestText)], TestText,
 196                sizeof(TestText));
 197         if (memcmp(&dpr->ToHyBuf[ERG_TO_HY_BUF_SIZE - sizeof(TestText)], TestText,
 198                    sizeof(TestText)))
 199                 return (-1);
 200
 201         memcpy(&dpr->ToPcBuf[ERG_TO_PC_BUF_SIZE - sizeof(TestText)], TestText,
 202                sizeof(TestText));
 203         if (memcmp(&dpr->ToPcBuf[ERG_TO_PC_BUF_SIZE - sizeof(TestText)], TestText,
 204                    sizeof(TestText)))
 205                 return (-1);
 206
 207         return (0);
 208 }                               /* ergo_testram */
 209
 210 /*****************************************************************************/
 211 /* this function is intended to write stage 1 boot image to the cards buffer */
 212 /* this is done in two steps. First the 1024 hi-words are written (offs=0),  */
 213 /* then the 1024 lo-bytes are written. The remaining DPRAM is cleared, the   */
 214 /* PCI-write-buffers flushed and the card is taken out of reset.             */
 215 /* The function then waits for a reaction of the E1 processor or a timeout.  */
 216 /* Negative return values are interpreted as errors.                         */
 217 /*****************************************************************************/
 218 static int
 219 ergo_writebootimg(struct HYSDN_CARD *card, unsigned char *buf,
 220                         unsigned long offs)
 221 {
 222         unsigned char *dst;
 223         tErgDpram *dpram;
 224         int cnt = (BOOT_IMG_SIZE >> 2);         /* number of words to move and swap (byte order!) */
 225
 226         if (card->debug_flags & LOG_POF_CARD)
 227                 hysdn_addlog(card, "ERGO: write bootldr offs=0x%lx ", offs);
 228
 229         dst = card->dpram;      /* pointer to start of DPRAM */
 230         dst += (offs + ERG_DPRAM_FILL_SIZE);    /* offset in the DPRAM */
 231         while (cnt--) {
 232                 *dst++ = *(buf + 1);    /* high byte */
 233                 *dst++ = *buf;  /* low byte */
 234                 dst += 2;       /* point to next longword */
 235                 buf += 2;       /* buffer only filled with words */
 236         }
 237
 238         /* if low words (offs = 2) have been written, clear the rest of the DPRAM, */
 239         /* flush the PCI-write-buffer and take the E1 out of reset */
 240         if (offs) {
 241                 memset(card->dpram, 0, ERG_DPRAM_FILL_SIZE);    /* fill the DPRAM still not cleared */
 242                 dpram = card->dpram;    /* get pointer to dpram structure */
 243                 dpram->ToHyNoDpramErrLog = 0xFF;        /* write a dpram register */
 244                 while (!dpram->ToHyNoDpramErrLog);      /* reread volatile register to flush PCI */
 245
 246                 byteout(card->iobase + PCI9050_USER_IO, PCI9050_E1_RUN);        /* start E1 processor */
 247                 /* the interrupts are still masked */
 248
 249                 sti();
 250                 msleep_interruptible(20);               /* Timeout 20ms */
 251
 252                 if (((tDpramBootSpooler *) card->dpram)->Len != DPRAM_SPOOLER_DATA_SIZE) {
 253                         if (card->debug_flags & LOG_POF_CARD)
 254                                 hysdn_addlog(card, "ERGO: write bootldr no answer");
 255                         return (-ERR_BOOTIMG_FAIL);
 256                 }
 257         }                       /* start_boot_img */
 258         return (0);             /* successful */
 259 }                               /* ergo_writebootimg */
 260
 261 /********************************************************************************/
 262 /* ergo_writebootseq writes the buffer containing len bytes to the E1 processor */
 263 /* using the boot spool mechanism. If everything works fine 0 is returned. In   */
 264 /* case of errors a negative error value is returned.                           */
 265 /********************************************************************************/
 266 static int
 267 ergo_writebootseq(struct HYSDN_CARD *card, unsigned char *buf, int len)
 268 {
 269         tDpramBootSpooler *sp = (tDpramBootSpooler *) card->dpram;
 270         unsigned char *dst;
 271         unsigned char buflen;
 272         int nr_write;
 273         unsigned char tmp_rdptr;
 274         unsigned char wr_mirror;
 275         int i;
 276
 277         if (card->debug_flags & LOG_POF_CARD)
 278                 hysdn_addlog(card, "ERGO: write boot seq len=%d ", len);
 279
 280         dst = sp->Data;         /* point to data in spool structure */
 281         buflen = sp->Len;       /* maximum len of spooled data */
 282         wr_mirror = sp->WrPtr;  /* only once read */
 283         sti();
 284
 285         /* try until all bytes written or error */
 286         i = 0x1000;             /* timeout value */
 287         while (len) {
 288
 289                 /* first determine the number of bytes that may be buffered */
 290                 do {
 291                         tmp_rdptr = sp->RdPtr;  /* first read the pointer */
 292                         i--;    /* decrement timeout */
 293                 } while (i && (tmp_rdptr != sp->RdPtr));        /* wait for stable pointer */
 294
 295                 if (!i) {
 296                         if (card->debug_flags & LOG_POF_CARD)
 297                                 hysdn_addlog(card, "ERGO: write boot seq timeout");
 298                         return (-ERR_BOOTSEQ_FAIL);     /* value not stable -> timeout */
 299                 }
 300                 if ((nr_write = tmp_rdptr - wr_mirror - 1) < 0)
 301                         nr_write += buflen;     /* now we got number of free bytes - 1 in buffer */
 302
 303                 if (!nr_write)
 304                         continue;       /* no free bytes in buffer */
 305
 306                 if (nr_write > len)
 307                         nr_write = len;         /* limit if last few bytes */
 308                 i = 0x1000;     /* reset timeout value */
 309
 310                 /* now we know how much bytes we may put in the puffer */
 311                 len -= nr_write;        /* we savely could adjust len before output */
 312                 while (nr_write--) {
 313                         *(dst + wr_mirror) = *buf++;    /* output one byte */
 314                         if (++wr_mirror >= buflen)
 315                                 wr_mirror = 0;
 316                         sp->WrPtr = wr_mirror;  /* announce the next byte to E1 */
 317                 }               /* while (nr_write) */
 318
 319         }                       /* while (len) */
 320         return (0);
 321 }                               /* ergo_writebootseq */
 322
 323 /***********************************************************************************/
 324 /* ergo_waitpofready waits for a maximum of 10 seconds for the completition of the */
 325 /* boot process. If the process has been successful 0 is returned otherwise a     */
 326 /* negative error code is returned.                                                */
 327 /***********************************************************************************/
 328 static int
 329 ergo_waitpofready(struct HYSDN_CARD *card)
 330 {
 331         tErgDpram *dpr = card->dpram;   /* pointer to DPRAM structure */
 332         int timecnt = 10000 / 50;       /* timeout is 10 secs max. */
 333         unsigned long flags;
 334         int msg_size;
 335         int i;
 336
 337         if (card->debug_flags & LOG_POF_CARD)
 338                 hysdn_addlog(card, "ERGO: waiting for pof ready");
 339         while (timecnt--) {
 340                 /* wait until timeout  */
 341
 342                 if (dpr->ToPcFlag) {
 343                         /* data has arrived */
 344
 345                         if ((dpr->ToPcChannel != CHAN_SYSTEM) ||
 346                             (dpr->ToPcSize < MIN_RDY_MSG_SIZE) ||
 347                             (dpr->ToPcSize > MAX_RDY_MSG_SIZE) ||
 348                             ((*(unsigned long *) dpr->ToPcBuf) != RDY_MAGIC))
 349                                 break;  /* an error occurred */
 350
 351                         /* Check for additional data delivered during SysReady */
 352                         msg_size = dpr->ToPcSize - RDY_MAGIC_SIZE;
 353                         if (msg_size > 0)
 354                                 if (EvalSysrTokData(card, dpr->ToPcBuf + RDY_MAGIC_SIZE, msg_size))
 355                                         break;
 356
 357                         if (card->debug_flags & LOG_POF_RECORD)
 358                                 hysdn_addlog(card, "ERGO: pof boot success");
 359                         save_flags(flags);
 360                         cli();
 361
 362                         card->state = CARD_STATE_RUN;   /* now card is running */
 363                         /* enable the cards interrupt */
 364                         byteout(card->iobase + PCI9050_INTR_REG,
 365                                 bytein(card->iobase + PCI9050_INTR_REG) |
 366                         (PCI9050_INTR_REG_ENPCI | PCI9050_INTR_REG_EN1));
 367                         card->irq_enabled = 1;  /* we are ready to receive interrupts */
 368
 369                         dpr->ToPcFlag = 0;      /* reset data indicator */
 370                         dpr->ToHyInt = 1;
 371                         dpr->ToPcInt = 1;       /* interrupt to E1 for all cards */
 372
 373                         restore_flags(flags);
 374                         if ((hynet_enable & (1 << card->myid))
 375                             && (i = hysdn_net_create(card)))
 376                         {
 377                                 ergo_stopcard(card);
 378                                 card->state = CARD_STATE_BOOTERR;
 379                                 return (i);
 380                         }
 381 #ifdef CONFIG_HYSDN_CAPI
 382                         if((i = hycapi_capi_create(card))) {
 383                                 printk(KERN_WARNING "HYSDN: failed to create capi-interface.\n");
 384                         }
 385 #endif /* CONFIG_HYSDN_CAPI */
 386                         return (0);     /* success */
 387                 }               /* data has arrived */
 388                 sti();
 389                 msleep_interruptible(50);               /* Timeout 50ms */
 390         }                       /* wait until timeout */
 391
 392         if (card->debug_flags & LOG_POF_CARD)
 393                 hysdn_addlog(card, "ERGO: pof boot ready timeout");
 394         return (-ERR_POF_TIMEOUT);
 395 }                               /* ergo_waitpofready */
 396
 397
 398
 399 /************************************************************************************/
 400 /* release the cards hardware. Before releasing do a interrupt disable and hardware */
 401 /* reset. Also unmap dpram.                                                         */
 402 /* Use only during module release.                                                  */
 403 /************************************************************************************/
 404 static void
 405 ergo_releasehardware(hysdn_card * card)
 406 {
 407         ergo_stopcard(card);    /* first stop the card if not already done */
 408         free_irq(card->irq, card);      /* release interrupt */
 409         release_region(card->iobase + PCI9050_INTR_REG, 1);     /* release all io ports */
 410         release_region(card->iobase + PCI9050_USER_IO, 1);
 411         vfree(card->dpram);
 412         card->dpram = NULL;     /* release shared mem */
 413 }                               /* ergo_releasehardware */
 414
 415
 416 /*********************************************************************************/
 417 /* acquire the needed hardware ports and map dpram. If an error occurs a nonzero */
 418 /* value is returned.                                                            */
 419 /* Use only during module init.                                                  */
 420 /*********************************************************************************/
 421 int
 422 ergo_inithardware(hysdn_card * card)
 423 {
 424         if (!request_region(card->iobase + PCI9050_INTR_REG, 1, "HYSDN"))
 425                 return (-1);
 426         if (!request_region(card->iobase + PCI9050_USER_IO, 1, "HYSDN")) {
 427                 release_region(card->iobase + PCI9050_INTR_REG, 1);
 428                 return (-1);    /* ports already in use */
 429         }
 430         card->memend = card->membase + ERG_DPRAM_PAGE_SIZE - 1;
 431         if (!(card->dpram = ioremap(card->membase, ERG_DPRAM_PAGE_SIZE))) {
 432                 release_region(card->iobase + PCI9050_INTR_REG, 1);
 433                 release_region(card->iobase + PCI9050_USER_IO, 1);
 434                 return (-1);
 435         }
 436
 437         ergo_stopcard(card);    /* disable interrupts */
 438         if (request_irq(card->irq, ergo_interrupt, IRQF_SHARED, "HYSDN", card)) {
 439                 ergo_releasehardware(card); /* return the acquired hardware */
 440                 return (-1);
 441         }
 442         /* success, now setup the function pointers */
 443         card->stopcard = ergo_stopcard;
 444         card->releasehardware = ergo_releasehardware;
 445         card->testram = ergo_testram;
 446         card->writebootimg = ergo_writebootimg;
 447         card->writebootseq = ergo_writebootseq;
 448         card->waitpofready = ergo_waitpofready;
 449         card->set_errlog_state = ergo_set_errlog_state;
 450         INIT_WORK(&card->irq_queue, (void *) (void *) ergo_irq_bh, card);
 451
 452         return (0);
 453 }                               /* ergo_inithardware */