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