drivers/net/hamradio/scc.c

   1 #define RCS_ID "$Id: scc.c,v 1.75 1998/11/04 15:15:01 jreuter Exp jreuter $"
   2
   3 #define VERSION "3.0"
   4
   5 /*
   6  * Please use z8530drv-utils-3.0 with this version.
   7  *            ------------------
   8  *
   9  * You can find a subset of the documentation in
  10  * Documentation/networking/z8530drv.txt.
  11  */
  12
  13 /*
  14    ********************************************************************
  15    *   SCC.C - Linux driver for Z8530 based HDLC cards for AX.25      *
  16    ********************************************************************
  17
  18
  19    ********************************************************************
  20
  21         Copyright (c) 1993, 2000 Joerg Reuter DL1BKE
  22
  23         portions (c) 1993 Guido ten Dolle PE1NNZ
  24
  25    ********************************************************************
  26
  27    The driver and the programs in the archive are UNDER CONSTRUCTION.
  28    The code is likely to fail, and so your kernel could --- even
  29    a whole network.
  30
  31    This driver is intended for Amateur Radio use. If you are running it
  32    for commercial purposes, please drop me a note. I am nosy...
  33
  34    ...BUT:
  35
  36    ! You  m u s t  recognize the appropriate legislations of your country !
  37    ! before you connect a radio to the SCC board and start to transmit or !
  38    ! receive. The GPL allows you to use the  d r i v e r,  NOT the RADIO! !
  39
  40    For non-Amateur-Radio use please note that you might need a special
  41    allowance/licence from the designer of the SCC Board and/or the
  42    MODEM.
  43
  44    This program is free software; you can redistribute it and/or modify
  45    it under the terms of the (modified) GNU General Public License
  46    delivered with the Linux kernel source.
  47
  48    This program is distributed in the hope that it will be useful,
  49    but WITHOUT ANY WARRANTY; without even the implied warranty of
  50    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  51    GNU General Public License for more details.
  52
  53    You should find a copy of the GNU General Public License in
  54    /usr/src/linux/COPYING;
  55
  56    ********************************************************************
  57
  58
  59    Incomplete history of z8530drv:
  60    -------------------------------
  61
  62    1994-09-13   started to write the driver, rescued most of my own
  63                 code (and Hans Alblas' memory buffer pool concept) from
  64                 an earlier project "sccdrv" which was initiated by
  65                 Guido ten Dolle. Not much of the old driver survived,
  66                 though. The first version I put my hands on was sccdrv1.3
  67                 from August 1993. The memory buffer pool concept
  68                 appeared in an unauthorized sccdrv version (1.5) from
  69                 August 1994.
  70
  71    1995-01-31   changed copyright notice to GPL without limitations.
  72
  73      .
  74      .  <SNIP>
  75      .
  76
  77    1996-10-05   New semester, new driver...
  78
  79                   * KISS TNC emulator removed (TTY driver)
  80                   * Source moved to drivers/net/
  81                   * Includes Z8530 defines from drivers/net/z8530.h
  82                   * Uses sk_buffer memory management
  83                   * Reduced overhead of /proc/net/z8530drv output
  84                   * Streamlined quite a lot things
  85                   * Invents brand new bugs... ;-)
  86
  87                   The move to version number 3.0 reflects theses changes.
  88                   You can use 'kissbridge' if you need a KISS TNC emulator.
  89
  90    1996-12-13   Fixed for Linux networking changes. (G4KLX)
  91    1997-01-08   Fixed the remaining problems.
  92    1997-04-02   Hopefully fixed the problems with the new *_timer()
  93                 routines, added calibration code.
  94    1997-10-12   Made SCC_DELAY a CONFIG option, added CONFIG_SCC_TRXECHO
  95    1998-01-29   Small fix to avoid lock-up on initialization
  96    1998-09-29   Fixed the "grouping" bugs, tx_inhibit works again,
  97                 using dev->tx_queue_len now instead of MAXQUEUE now.
  98    1998-10-21   Postponed the spinlock changes, would need a lot of
  99                 testing I currently don't have the time to. Softdcd doesn't
 100                 work.
 101    1998-11-04   Softdcd does not work correctly in DPLL mode, in fact it
 102                 never did. The DPLL locks on noise, the SYNC unit sees
 103                 flags that aren't... Restarting the DPLL does not help
 104                 either, it resynchronizes too slow and the first received
 105                 frame gets lost.
 106    2000-02-13   Fixed for new network driver interface changes, still
 107                 does TX timeouts itself since it uses its own queue
 108                 scheme.
 109
 110    Thanks to all who contributed to this driver with ideas and bug
 111    reports!
 112
 113    NB -- if you find errors, change something, please let me know
 114          first before you distribute it... And please don't touch
 115          the version number. Just replace my callsign in
 116          "v3.0.dl1bke" with your own. Just to avoid confusion...
 117
 118    If you want to add your modification to the linux distribution
 119    please (!) contact me first.
 120
 121    New versions of the driver will be announced on the linux-hams
 122    mailing list on vger.kernel.org. To subscribe send an e-mail
 123    to majordomo@vger.kernel.org with the following line in
 124    the body of the mail:
 125
 126            subscribe linux-hams
 127
 128    The content of the "Subject" field will be ignored.
 129
 130    vy 73,
 131    Joerg Reuter ampr-net: dl1bke@db0pra.ampr.org
 132                 AX-25   : DL1BKE @ DB0ABH.#BAY.DEU.EU
 133                 Internet: jreuter@yaina.de
 134                 www     : http://yaina.de/jreuter
 135 */
 136
 137 /* ----------------------------------------------------------------------- */
 138
 139 #undef  SCC_LDELAY              /* slow it even a bit more down */
 140 #undef  SCC_DONT_CHECK          /* don't look if the SCCs you specified are available */
 141
 142 #define SCC_MAXCHIPS    4       /* number of max. supported chips */
 143 #define SCC_BUFSIZE     384     /* must not exceed 4096 */
 144 #undef  SCC_DEBUG
 145
 146 #define SCC_DEFAULT_CLOCK       4915200
 147                                 /* default pclock if nothing is specified */
 148
 149 /* ----------------------------------------------------------------------- */
 150
 151 #include <linux/module.h>
 152 #include <linux/errno.h>
 153 #include <linux/signal.h>
 154 #include <linux/timer.h>
 155 #include <linux/interrupt.h>
 156 #include <linux/ioport.h>
 157 #include <linux/string.h>
 158 #include <linux/in.h>
 159 #include <linux/fcntl.h>
 160 #include <linux/ptrace.h>
 161 #include <linux/slab.h>
 162 #include <linux/delay.h>
 163 #include <linux/skbuff.h>
 164 #include <linux/netdevice.h>
 165 #include <linux/rtnetlink.h>
 166 #include <linux/if_ether.h>
 167 #include <linux/if_arp.h>
 168 #include <linux/socket.h>
 169 #include <linux/init.h>
 170 #include <linux/scc.h>
 171 #include <linux/ctype.h>
 172 #include <linux/kernel.h>
 173 #include <linux/proc_fs.h>
 174 #include <linux/seq_file.h>
 175 #include <linux/bitops.h>
 176
 177 #include <net/ax25.h>
 178
 179 #include <asm/irq.h>
 180 #include <asm/system.h>
 181 #include <asm/io.h>
 182 #include <asm/uaccess.h>
 183
 184 #include "z8530.h"
 185
 186 static char banner[] __initdata = KERN_INFO "AX.25: Z8530 SCC driver version "VERSION".dl1bke\n";
 187
 188 static void t_dwait(unsigned long);
 189 static void t_txdelay(unsigned long);
 190 static void t_tail(unsigned long);
 191 static void t_busy(unsigned long);
 192 static void t_maxkeyup(unsigned long);
 193 static void t_idle(unsigned long);
 194 static void scc_tx_done(struct scc_channel *);
 195 static void scc_start_tx_timer(struct scc_channel *, void (*)(unsigned long), unsigned long);
 196 static void scc_start_maxkeyup(struct scc_channel *);
 197 static void scc_start_defer(struct scc_channel *);
 198
 199 static void z8530_init(void);
 200
 201 static void init_channel(struct scc_channel *scc);
 202 static void scc_key_trx (struct scc_channel *scc, char tx);
 203 static irqreturn_t scc_isr(int irq, void *dev_id);
 204 static void scc_init_timer(struct scc_channel *scc);
 205
 206 static int scc_net_alloc(const char *name, struct scc_channel *scc);
 207 static void scc_net_setup(struct net_device *dev);
 208 static int scc_net_open(struct net_device *dev);
 209 static int scc_net_close(struct net_device *dev);
 210 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb);
 211 static int scc_net_tx(struct sk_buff *skb, struct net_device *dev);
 212 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
 213 static int scc_net_set_mac_address(struct net_device *dev, void *addr);
 214 static struct net_device_stats * scc_net_get_stats(struct net_device *dev);
 215
 216 static unsigned char SCC_DriverName[] = "scc";
 217
 218 static struct irqflags { unsigned char used : 1; } Ivec[NR_IRQS];
 219
 220 static struct scc_channel SCC_Info[2 * SCC_MAXCHIPS];   /* information per channel */
 221
 222 static struct scc_ctrl {
 223         io_port chan_A;
 224         io_port chan_B;
 225         int irq;
 226 } SCC_ctrl[SCC_MAXCHIPS+1];
 227
 228 static unsigned char Driver_Initialized;
 229 static int Nchips;
 230 static io_port Vector_Latch;
 231
 232
 233 /* ******************************************************************** */
 234 /* *                    Port Access Functions                         * */
 235 /* ******************************************************************** */
 236
 237 /* These provide interrupt save 2-step access to the Z8530 registers */
 238
 239 static DEFINE_SPINLOCK(iolock); /* Guards paired accesses */
 240
 241 static inline unsigned char InReg(io_port port, unsigned char reg)
 242 {
 243         unsigned long flags;
 244         unsigned char r;
 245
 246         spin_lock_irqsave(&iolock, flags);
 247 #ifdef SCC_LDELAY
 248         Outb(port, reg);
 249         udelay(SCC_LDELAY);
 250         r=Inb(port);
 251         udelay(SCC_LDELAY);
 252 #else
 253         Outb(port, reg);
 254         r=Inb(port);
 255 #endif
 256         spin_unlock_irqrestore(&iolock, flags);
 257         return r;
 258 }
 259
 260 static inline void OutReg(io_port port, unsigned char reg, unsigned char val)
 261 {
 262         unsigned long flags;
 263
 264         spin_lock_irqsave(&iolock, flags);
 265 #ifdef SCC_LDELAY
 266         Outb(port, reg); udelay(SCC_LDELAY);
 267         Outb(port, val); udelay(SCC_LDELAY);
 268 #else
 269         Outb(port, reg);
 270         Outb(port, val);
 271 #endif
 272         spin_unlock_irqrestore(&iolock, flags);
 273 }
 274
 275 static inline void wr(struct scc_channel *scc, unsigned char reg,
 276         unsigned char val)
 277 {
 278         OutReg(scc->ctrl, reg, (scc->wreg[reg] = val));
 279 }
 280
 281 static inline void or(struct scc_channel *scc, unsigned char reg, unsigned char val)
 282 {
 283         OutReg(scc->ctrl, reg, (scc->wreg[reg] |= val));
 284 }
 285
 286 static inline void cl(struct scc_channel *scc, unsigned char reg, unsigned char val)
 287 {
 288         OutReg(scc->ctrl, reg, (scc->wreg[reg] &= ~val));
 289 }
 290
 291 /* ******************************************************************** */
 292 /* *                    Some useful macros                            * */
 293 /* ******************************************************************** */
 294
 295 static inline void scc_discard_buffers(struct scc_channel *scc)
 296 {
 297         unsigned long flags;
 298
 299         spin_lock_irqsave(&scc->lock, flags);
 300         if (scc->tx_buff != NULL)
 301         {
 302                 dev_kfree_skb(scc->tx_buff);
 303                 scc->tx_buff = NULL;
 304         }
 305
 306         while (!skb_queue_empty(&scc->tx_queue))
 307                 dev_kfree_skb(skb_dequeue(&scc->tx_queue));
 308
 309         spin_unlock_irqrestore(&scc->lock, flags);
 310 }
 311
 312
 313
 314 /* ******************************************************************** */
 315 /* *                    Interrupt Service Routines                    * */
 316 /* ******************************************************************** */
 317
 318
 319 /* ----> subroutines for the interrupt handlers <---- */
 320
 321 static inline void scc_notify(struct scc_channel *scc, int event)
 322 {
 323         struct sk_buff *skb;
 324         char *bp;
 325
 326         if (scc->kiss.fulldup != KISS_DUPLEX_OPTIMA)
 327                 return;
 328
 329         skb = dev_alloc_skb(2);
 330         if (skb != NULL)
 331         {
 332                 bp = skb_put(skb, 2);
 333                 *bp++ = PARAM_HWEVENT;
 334                 *bp++ = event;
 335                 scc_net_rx(scc, skb);
 336         } else
 337                 scc->stat.nospace++;
 338 }
 339
 340 static inline void flush_rx_FIFO(struct scc_channel *scc)
 341 {
 342         int k;
 343
 344         for (k=0; k<3; k++)
 345                 Inb(scc->data);
 346
 347         if(scc->rx_buff != NULL)                /* did we receive something? */
 348         {
 349                 scc->stat.rxerrs++;  /* then count it as an error */
 350                 dev_kfree_skb_irq(scc->rx_buff);
 351                 scc->rx_buff = NULL;
 352         }
 353 }
 354
 355 static void start_hunt(struct scc_channel *scc)
 356 {
 357         if ((scc->modem.clocksrc != CLK_EXTERNAL))
 358                 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
 359         or(scc,R3,ENT_HM|RxENABLE);  /* enable the receiver, hunt mode */
 360 }
 361
 362 /* ----> four different interrupt handlers for Tx, Rx, changing of      */
 363 /*       DCD/CTS and Rx/Tx errors                                       */
 364
 365 /* Transmitter interrupt handler */
 366 static inline void scc_txint(struct scc_channel *scc)
 367 {
 368         struct sk_buff *skb;
 369
 370         scc->stat.txints++;
 371         skb = scc->tx_buff;
 372
 373         /* send first octet */
 374
 375         if (skb == NULL)
 376         {
 377                 skb = skb_dequeue(&scc->tx_queue);
 378                 scc->tx_buff = skb;
 379                 netif_wake_queue(scc->dev);
 380
 381                 if (skb == NULL)
 382                 {
 383                         scc_tx_done(scc);
 384                         Outb(scc->ctrl, RES_Tx_P);
 385                         return;
 386                 }
 387
 388                 if (skb->len == 0)              /* Paranoia... */
 389                 {
 390                         dev_kfree_skb_irq(skb);
 391                         scc->tx_buff = NULL;
 392                         scc_tx_done(scc);
 393                         Outb(scc->ctrl, RES_Tx_P);
 394                         return;
 395                 }
 396
 397                 scc->stat.tx_state = TXS_ACTIVE;
 398
 399                 OutReg(scc->ctrl, R0, RES_Tx_CRC);
 400                                                 /* reset CRC generator */
 401                 or(scc,R10,ABUNDER);            /* re-install underrun protection */
 402                 Outb(scc->data,*skb->data);     /* send byte */
 403                 skb_pull(skb, 1);
 404
 405                 if (!scc->enhanced)             /* reset EOM latch */
 406                         Outb(scc->ctrl,RES_EOM_L);
 407                 return;
 408         }
 409
 410         /* End Of Frame... */
 411
 412         if (skb->len == 0)
 413         {
 414                 Outb(scc->ctrl, RES_Tx_P);      /* reset pending int */
 415                 cl(scc, R10, ABUNDER);          /* send CRC */
 416                 dev_kfree_skb_irq(skb);
 417                 scc->tx_buff = NULL;
 418                 scc->stat.tx_state = TXS_NEWFRAME; /* next frame... */
 419                 return;
 420         }
 421
 422         /* send octet */
 423
 424         Outb(scc->data,*skb->data);
 425         skb_pull(skb, 1);
 426 }
 427
 428
 429 /* External/Status interrupt handler */
 430 static inline void scc_exint(struct scc_channel *scc)
 431 {
 432         unsigned char status,changes,chg_and_stat;
 433
 434         scc->stat.exints++;
 435
 436         status = InReg(scc->ctrl,R0);
 437         changes = status ^ scc->status;
 438         chg_and_stat = changes & status;
 439
 440         /* ABORT: generated whenever DCD drops while receiving */
 441
 442         if (chg_and_stat & BRK_ABRT)            /* Received an ABORT */
 443                 flush_rx_FIFO(scc);
 444
 445         /* HUNT: software DCD; on = waiting for SYNC, off = receiving frame */
 446
 447         if ((changes & SYNC_HUNT) && scc->kiss.softdcd)
 448         {
 449                 if (status & SYNC_HUNT)
 450                 {
 451                         scc->dcd = 0;
 452                         flush_rx_FIFO(scc);
 453                         if ((scc->modem.clocksrc != CLK_EXTERNAL))
 454                                 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
 455                 } else {
 456                         scc->dcd = 1;
 457                 }
 458
 459                 scc_notify(scc, scc->dcd? HWEV_DCD_OFF:HWEV_DCD_ON);
 460         }
 461
 462         /* DCD: on = start to receive packet, off = ABORT condition */
 463         /* (a successfully received packet generates a special condition int) */
 464
 465         if((changes & DCD) && !scc->kiss.softdcd) /* DCD input changed state */
 466         {
 467                 if(status & DCD)                /* DCD is now ON */
 468                 {
 469                         start_hunt(scc);
 470                         scc->dcd = 1;
 471                 } else {                        /* DCD is now OFF */
 472                         cl(scc,R3,ENT_HM|RxENABLE); /* disable the receiver */
 473                         flush_rx_FIFO(scc);
 474                         scc->dcd = 0;
 475                 }
 476
 477                 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
 478         }
 479
 480 #ifdef notdef
 481         /* CTS: use external TxDelay (what's that good for?!)
 482          * Anyway: If we _could_ use it (BayCom USCC uses CTS for
 483          * own purposes) we _should_ use the "autoenable" feature
 484          * of the Z8530 and not this interrupt...
 485          */
 486
 487         if (chg_and_stat & CTS)                 /* CTS is now ON */
 488         {
 489                 if (scc->kiss.txdelay == 0)     /* zero TXDELAY = wait for CTS */
 490                         scc_start_tx_timer(scc, t_txdelay, 0);
 491         }
 492 #endif
 493
 494         if (scc->stat.tx_state == TXS_ACTIVE && (status & TxEOM))
 495         {
 496                 scc->stat.tx_under++;     /* oops, an underrun! count 'em */
 497                 Outb(scc->ctrl, RES_EXT_INT);   /* reset ext/status interrupts */
 498
 499                 if (scc->tx_buff != NULL)
 500                 {
 501                         dev_kfree_skb_irq(scc->tx_buff);
 502                         scc->tx_buff = NULL;
 503                 }
 504
 505                 or(scc,R10,ABUNDER);
 506                 scc_start_tx_timer(scc, t_txdelay, 0);  /* restart transmission */
 507         }
 508
 509         scc->status = status;
 510         Outb(scc->ctrl,RES_EXT_INT);
 511 }
 512
 513
 514 /* Receiver interrupt handler */
 515 static inline void scc_rxint(struct scc_channel *scc)
 516 {
 517         struct sk_buff *skb;
 518
 519         scc->stat.rxints++;
 520
 521         if((scc->wreg[5] & RTS) && scc->kiss.fulldup == KISS_DUPLEX_HALF)
 522         {
 523                 Inb(scc->data);         /* discard char */
 524                 or(scc,R3,ENT_HM);      /* enter hunt mode for next flag */
 525                 return;
 526         }
 527
 528         skb = scc->rx_buff;
 529
 530         if (skb == NULL)
 531         {
 532                 skb = dev_alloc_skb(scc->stat.bufsize);
 533                 if (skb == NULL)
 534                 {
 535                         scc->dev_stat.rx_dropped++;
 536                         scc->stat.nospace++;
 537                         Inb(scc->data);
 538                         or(scc, R3, ENT_HM);
 539                         return;
 540                 }
 541
 542                 scc->rx_buff = skb;
 543                 *(skb_put(skb, 1)) = 0; /* KISS data */
 544         }
 545
 546         if (skb->len >= scc->stat.bufsize)
 547         {
 548 #ifdef notdef
 549                 printk(KERN_DEBUG "z8530drv: oops, scc_rxint() received huge frame...\n");
 550 #endif
 551                 dev_kfree_skb_irq(skb);
 552                 scc->rx_buff = NULL;
 553                 Inb(scc->data);
 554                 or(scc, R3, ENT_HM);
 555                 return;
 556         }
 557
 558         *(skb_put(skb, 1)) = Inb(scc->data);
 559 }
 560
 561
 562 /* Receive Special Condition interrupt handler */
 563 static inline void scc_spint(struct scc_channel *scc)
 564 {
 565         unsigned char status;
 566         struct sk_buff *skb;
 567
 568         scc->stat.spints++;
 569
 570         status = InReg(scc->ctrl,R1);           /* read receiver status */
 571
 572         Inb(scc->data);                         /* throw away Rx byte */
 573         skb = scc->rx_buff;
 574
 575         if(status & Rx_OVR)                     /* receiver overrun */
 576         {
 577                 scc->stat.rx_over++;             /* count them */
 578                 or(scc,R3,ENT_HM);               /* enter hunt mode for next flag */
 579
 580                 if (skb != NULL)
 581                         dev_kfree_skb_irq(skb);
 582                 scc->rx_buff = skb = NULL;
 583         }
 584
 585         if(status & END_FR && skb != NULL)      /* end of frame */
 586         {
 587                 /* CRC okay, frame ends on 8 bit boundary and received something ? */
 588
 589                 if (!(status & CRC_ERR) && (status & 0xe) == RES8 && skb->len > 0)
 590                 {
 591                         /* ignore last received byte (first of the CRC bytes) */
 592                         skb_trim(skb, skb->len-1);
 593                         scc_net_rx(scc, skb);
 594                         scc->rx_buff = NULL;
 595                         scc->stat.rxframes++;
 596                 } else {                                /* a bad frame */
 597                         dev_kfree_skb_irq(skb);
 598                         scc->rx_buff = NULL;
 599                         scc->stat.rxerrs++;
 600                 }
 601         }
 602
 603         Outb(scc->ctrl,ERR_RES);
 604 }
 605
 606
 607 /* ----> interrupt service routine for the Z8530 <---- */
 608
 609 static void scc_isr_dispatch(struct scc_channel *scc, int vector)
 610 {
 611         spin_lock(&scc->lock);
 612         switch (vector & VECTOR_MASK)
 613         {
 614                 case TXINT: scc_txint(scc); break;
 615                 case EXINT: scc_exint(scc); break;
 616                 case RXINT: scc_rxint(scc); break;
 617                 case SPINT: scc_spint(scc); break;
 618         }
 619         spin_unlock(&scc->lock);
 620 }
 621
 622 /* If the card has a latch for the interrupt vector (like the PA0HZP card)
 623    use it to get the number of the chip that generated the int.
 624    If not: poll all defined chips.
 625  */
 626
 627 #define SCC_IRQTIMEOUT 30000
 628
 629 static irqreturn_t scc_isr(int irq, void *dev_id)
 630 {
 631         unsigned char vector;
 632         struct scc_channel *scc;
 633         struct scc_ctrl *ctrl;
 634         int k;
 635
 636         if (Vector_Latch)
 637         {
 638                 for(k=0; k < SCC_IRQTIMEOUT; k++)
 639                 {
 640                         Outb(Vector_Latch, 0);      /* Generate INTACK */
 641
 642                         /* Read the vector */
 643                         if((vector=Inb(Vector_Latch)) >= 16 * Nchips) break;
 644                         if (vector & 0x01) break;
 645
 646                         scc=&SCC_Info[vector >> 3 ^ 0x01];
 647                         if (!scc->dev) break;
 648
 649                         scc_isr_dispatch(scc, vector);
 650
 651                         OutReg(scc->ctrl,R0,RES_H_IUS);              /* Reset Highest IUS */
 652                 }
 653
 654                 if (k == SCC_IRQTIMEOUT)
 655                         printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?\n");
 656
 657                 return IRQ_HANDLED;
 658         }
 659
 660         /* Find the SCC generating the interrupt by polling all attached SCCs
 661          * reading RR3A (the interrupt pending register)
 662          */
 663
 664         ctrl = SCC_ctrl;
 665         while (ctrl->chan_A)
 666         {
 667                 if (ctrl->irq != irq)
 668                 {
 669                         ctrl++;
 670                         continue;
 671                 }
 672
 673                 scc = NULL;
 674                 for (k = 0; InReg(ctrl->chan_A,R3) && k < SCC_IRQTIMEOUT; k++)
 675                 {
 676                         vector=InReg(ctrl->chan_B,R2);  /* Read the vector */
 677                         if (vector & 0x01) break;
 678
 679                         scc = &SCC_Info[vector >> 3 ^ 0x01];
 680                         if (!scc->dev) break;
 681
 682                         scc_isr_dispatch(scc, vector);
 683                 }
 684
 685                 if (k == SCC_IRQTIMEOUT)
 686                 {
 687                         printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?!\n");
 688                         break;
 689                 }
 690
 691                 /* This looks weird and it is. At least the BayCom USCC doesn't
 692                  * use the Interrupt Daisy Chain, thus we'll have to start
 693                  * all over again to be sure not to miss an interrupt from
 694                  * (any of) the other chip(s)...
 695                  * Honestly, the situation *is* braindamaged...
 696                  */
 697
 698                 if (scc != NULL)
 699                 {
 700                         OutReg(scc->ctrl,R0,RES_H_IUS);
 701                         ctrl = SCC_ctrl;
 702                 } else
 703                         ctrl++;
 704         }
 705         return IRQ_HANDLED;
 706 }
 707
 708
 709
 710 /* ******************************************************************** */
 711 /* *                    Init Channel                                    */
 712 /* ******************************************************************** */
 713
 714
 715 /* ----> set SCC channel speed <---- */
 716
 717 static inline void set_brg(struct scc_channel *scc, unsigned int tc)
 718 {
 719         cl(scc,R14,BRENABL);            /* disable baudrate generator */
 720         wr(scc,R12,tc & 255);           /* brg rate LOW */
 721         wr(scc,R13,tc >> 8);            /* brg rate HIGH */
 722         or(scc,R14,BRENABL);            /* enable baudrate generator */
 723 }
 724
 725 static inline void set_speed(struct scc_channel *scc)
 726 {
 727         unsigned long flags;
 728         spin_lock_irqsave(&scc->lock, flags);
 729
 730         if (scc->modem.speed > 0)       /* paranoia... */
 731                 set_brg(scc, (unsigned) (scc->clock / (scc->modem.speed * 64)) - 2);
 732
 733         spin_unlock_irqrestore(&scc->lock, flags);
 734 }
 735
 736
 737 /* ----> initialize a SCC channel <---- */
 738
 739 static inline void init_brg(struct scc_channel *scc)
 740 {
 741         wr(scc, R14, BRSRC);                            /* BRG source = PCLK */
 742         OutReg(scc->ctrl, R14, SSBR|scc->wreg[R14]);    /* DPLL source = BRG */
 743         OutReg(scc->ctrl, R14, SNRZI|scc->wreg[R14]);   /* DPLL NRZI mode */
 744 }
 745
 746 /*
 747  * Initialization according to the Z8530 manual (SGS-Thomson's version):
 748  *
 749  * 1. Modes and constants
 750  *
 751  * WR9  11000000        chip reset
 752  * WR4  XXXXXXXX        Tx/Rx control, async or sync mode
 753  * WR1  0XX00X00        select W/REQ (optional)
 754  * WR2  XXXXXXXX        program interrupt vector
 755  * WR3  XXXXXXX0        select Rx control
 756  * WR5  XXXX0XXX        select Tx control
 757  * WR6  XXXXXXXX        sync character
 758  * WR7  XXXXXXXX        sync character
 759  * WR9  000X0XXX        select interrupt control
 760  * WR10 XXXXXXXX        miscellaneous control (optional)
 761  * WR11 XXXXXXXX        clock control
 762  * WR12 XXXXXXXX        time constant lower byte (optional)
 763  * WR13 XXXXXXXX        time constant upper byte (optional)
 764  * WR14 XXXXXXX0        miscellaneous control
 765  * WR14 XXXSSSSS        commands (optional)
 766  *
 767  * 2. Enables
 768  *
 769  * WR14 000SSSS1        baud rate enable
 770  * WR3  SSSSSSS1        Rx enable
 771  * WR5  SSSS1SSS        Tx enable
 772  * WR0  10000000        reset Tx CRG (optional)
 773  * WR1  XSS00S00        DMA enable (optional)
 774  *
 775  * 3. Interrupt status
 776  *
 777  * WR15 XXXXXXXX        enable external/status
 778  * WR0  00010000        reset external status
 779  * WR0  00010000        reset external status twice
 780  * WR1  SSSXXSXX        enable Rx, Tx and Ext/status
 781  * WR9  000SXSSS        enable master interrupt enable
 782  *
 783  * 1 = set to one, 0 = reset to zero
 784  * X = user defined, S = same as previous init
 785  *
 786  *
 787  * Note that the implementation differs in some points from above scheme.
 788  *
 789  */
 790
 791 static void init_channel(struct scc_channel *scc)
 792 {
 793         del_timer(&scc->tx_t);
 794         del_timer(&scc->tx_wdog);
 795
 796         disable_irq(scc->irq);
 797
 798         wr(scc,R4,X1CLK|SDLC);          /* *1 clock, SDLC mode */
 799         wr(scc,R1,0);                   /* no W/REQ operation */
 800         wr(scc,R3,Rx8|RxCRC_ENAB);      /* RX 8 bits/char, CRC, disabled */
 801         wr(scc,R5,Tx8|DTR|TxCRC_ENAB);  /* TX 8 bits/char, disabled, DTR */
 802         wr(scc,R6,0);                   /* SDLC address zero (not used) */
 803         wr(scc,R7,FLAG);                /* SDLC flag value */
 804         wr(scc,R9,VIS);                 /* vector includes status */
 805         wr(scc,R10,(scc->modem.nrz? NRZ : NRZI)|CRCPS|ABUNDER); /* abort on underrun, preset CRC generator, NRZ(I) */
 806         wr(scc,R14, 0);
 807
 808
 809 /* set clock sources:
 810
 811    CLK_DPLL: normal halfduplex operation
 812
 813                 RxClk: use DPLL
 814                 TxClk: use DPLL
 815                 TRxC mode DPLL output
 816
 817    CLK_EXTERNAL: external clocking (G3RUH or DF9IC modem)
 818
 819                 BayCom:                 others:
 820
 821                 TxClk = pin RTxC        TxClk = pin TRxC
 822                 RxClk = pin TRxC        RxClk = pin RTxC
 823
 824
 825    CLK_DIVIDER:
 826                 RxClk = use DPLL
 827                 TxClk = pin RTxC
 828
 829                 BayCom:                 others:
 830                 pin TRxC = DPLL         pin TRxC = BRG
 831                 (RxClk * 1)             (RxClk * 32)
 832 */
 833
 834
 835         switch(scc->modem.clocksrc)
 836         {
 837                 case CLK_DPLL:
 838                         wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
 839                         init_brg(scc);
 840                         break;
 841
 842                 case CLK_DIVIDER:
 843                         wr(scc, R11, ((scc->brand & BAYCOM)? TRxCDP : TRxCBR) | RCDPLL|TCRTxCP|TRxCOI);
 844                         init_brg(scc);
 845                         break;
 846
 847                 case CLK_EXTERNAL:
 848                         wr(scc, R11, (scc->brand & BAYCOM)? RCTRxCP|TCRTxCP : RCRTxCP|TCTRxCP);
 849                         OutReg(scc->ctrl, R14, DISDPLL);
 850                         break;
 851
 852         }
 853
 854         set_speed(scc);                 /* set baudrate */
 855
 856         if(scc->enhanced)
 857         {
 858                 or(scc,R15,SHDLCE|FIFOE);       /* enable FIFO, SDLC/HDLC Enhancements (From now R7 is R7') */
 859                 wr(scc,R7,AUTOEOM);
 860         }
 861
 862         if(scc->kiss.softdcd || (InReg(scc->ctrl,R0) & DCD))
 863                                                 /* DCD is now ON */
 864         {
 865                 start_hunt(scc);
 866         }
 867
 868         /* enable ABORT, DCD & SYNC/HUNT interrupts */
 869
 870         wr(scc,R15, BRKIE|TxUIE|(scc->kiss.softdcd? SYNCIE:DCDIE));
 871
 872         Outb(scc->ctrl,RES_EXT_INT);    /* reset ext/status interrupts */
 873         Outb(scc->ctrl,RES_EXT_INT);    /* must be done twice */
 874
 875         or(scc,R1,INT_ALL_Rx|TxINT_ENAB|EXT_INT_ENAB); /* enable interrupts */
 876
 877         scc->status = InReg(scc->ctrl,R0);      /* read initial status */
 878
 879         or(scc,R9,MIE);                 /* master interrupt enable */
 880
 881         scc_init_timer(scc);
 882
 883         enable_irq(scc->irq);
 884 }
 885
 886
 887
 888
 889 /* ******************************************************************** */
 890 /* *                    SCC timer functions                           * */
 891 /* ******************************************************************** */
 892
 893
 894 /* ----> scc_key_trx sets the time constant for the baudrate
 895          generator and keys the transmitter                  <---- */
 896
 897 static void scc_key_trx(struct scc_channel *scc, char tx)
 898 {
 899         unsigned int time_const;
 900
 901         if (scc->brand & PRIMUS)
 902                 Outb(scc->ctrl + 4, scc->option | (tx? 0x80 : 0));
 903
 904         if (scc->modem.speed < 300)
 905                 scc->modem.speed = 1200;
 906
 907         time_const = (unsigned) (scc->clock / (scc->modem.speed * (tx? 2:64))) - 2;
 908
 909         disable_irq(scc->irq);
 910
 911         if (tx)
 912         {
 913                 or(scc, R1, TxINT_ENAB);        /* t_maxkeyup may have reset these */
 914                 or(scc, R15, TxUIE);
 915         }
 916
 917         if (scc->modem.clocksrc == CLK_DPLL)
 918         {                               /* force simplex operation */
 919                 if (tx)
 920                 {
 921 #ifdef CONFIG_SCC_TRXECHO
 922                         cl(scc, R3, RxENABLE|ENT_HM);   /* switch off receiver */
 923                         cl(scc, R15, DCDIE|SYNCIE);     /* No DCD changes, please */
 924 #endif
 925                         set_brg(scc, time_const);       /* reprogram baudrate generator */
 926
 927                         /* DPLL -> Rx clk, BRG -> Tx CLK, TRxC mode output, TRxC = BRG */
 928                         wr(scc, R11, RCDPLL|TCBR|TRxCOI|TRxCBR);
 929
 930                         /* By popular demand: tx_inhibit */
 931                         if (scc->kiss.tx_inhibit)
 932                         {
 933                                 or(scc,R5, TxENAB);
 934                                 scc->wreg[R5] |= RTS;
 935                         } else {
 936                                 or(scc,R5,RTS|TxENAB);  /* set the RTS line and enable TX */
 937                         }
 938                 } else {
 939                         cl(scc,R5,RTS|TxENAB);
 940
 941                         set_brg(scc, time_const);       /* reprogram baudrate generator */
 942
 943                         /* DPLL -> Rx clk, DPLL -> Tx CLK, TRxC mode output, TRxC = DPLL */
 944                         wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
 945
 946 #ifndef CONFIG_SCC_TRXECHO
 947                         if (scc->kiss.softdcd)
 948 #endif
 949                         {
 950                                 or(scc,R15, scc->kiss.softdcd? SYNCIE:DCDIE);
 951                                 start_hunt(scc);
 952                         }
 953                 }
 954         } else {
 955                 if (tx)
 956                 {
 957 #ifdef CONFIG_SCC_TRXECHO
 958                         if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
 959                         {
 960                                 cl(scc, R3, RxENABLE);
 961                                 cl(scc, R15, DCDIE|SYNCIE);
 962                         }
 963 #endif
 964
 965                         if (scc->kiss.tx_inhibit)
 966                         {
 967                                 or(scc,R5, TxENAB);
 968                                 scc->wreg[R5] |= RTS;
 969                         } else {
 970                                 or(scc,R5,RTS|TxENAB);  /* enable tx */
 971                         }
 972                 } else {
 973                         cl(scc,R5,RTS|TxENAB);          /* disable tx */
 974
 975                         if ((scc->kiss.fulldup == KISS_DUPLEX_HALF) &&
 976 #ifndef CONFIG_SCC_TRXECHO
 977                             scc->kiss.softdcd)
 978 #else
 979                             1)
 980 #endif
 981                         {
 982                                 or(scc, R15, scc->kiss.softdcd? SYNCIE:DCDIE);
 983                                 start_hunt(scc);
 984                         }
 985                 }
 986         }
 987
 988         enable_irq(scc->irq);
 989 }
 990
 991
 992 /* ----> SCC timer interrupt handler and friends. <---- */
 993
 994 static void __scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
 995 {
 996         del_timer(&scc->tx_t);
 997
 998         if (when == 0)
 999         {
1000                 handler((unsigned long) scc);
1001         } else
1002         if (when != TIMER_OFF)
1003         {
1004                 scc->tx_t.data = (unsigned long) scc;
1005                 scc->tx_t.function = handler;
1006                 scc->tx_t.expires = jiffies + (when*HZ)/100;
1007                 add_timer(&scc->tx_t);
1008         }
1009 }
1010
1011 static void scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
1012 {
1013         unsigned long flags;
1014
1015         spin_lock_irqsave(&scc->lock, flags);
1016         __scc_start_tx_timer(scc, handler, when);
1017         spin_unlock_irqrestore(&scc->lock, flags);
1018 }
1019
1020 static void scc_start_defer(struct scc_channel *scc)
1021 {
1022         unsigned long flags;
1023
1024         spin_lock_irqsave(&scc->lock, flags);
1025         del_timer(&scc->tx_wdog);
1026
1027         if (scc->kiss.maxdefer != 0 && scc->kiss.maxdefer != TIMER_OFF)
1028         {
1029                 scc->tx_wdog.data = (unsigned long) scc;
1030                 scc->tx_wdog.function = t_busy;
1031                 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxdefer;
1032                 add_timer(&scc->tx_wdog);
1033         }
1034         spin_unlock_irqrestore(&scc->lock, flags);
1035 }
1036
1037 static void scc_start_maxkeyup(struct scc_channel *scc)
1038 {
1039         unsigned long flags;
1040
1041         spin_lock_irqsave(&scc->lock, flags);
1042         del_timer(&scc->tx_wdog);
1043
1044         if (scc->kiss.maxkeyup != 0 && scc->kiss.maxkeyup != TIMER_OFF)
1045         {
1046                 scc->tx_wdog.data = (unsigned long) scc;
1047                 scc->tx_wdog.function = t_maxkeyup;
1048                 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxkeyup;
1049                 add_timer(&scc->tx_wdog);
1050         }
1051         spin_unlock_irqrestore(&scc->lock, flags);
1052 }
1053
1054 /*
1055  * This is called from scc_txint() when there are no more frames to send.
1056  * Not exactly a timer function, but it is a close friend of the family...
1057  */
1058
1059 static void scc_tx_done(struct scc_channel *scc)
1060 {
1061         /*
1062          * trx remains keyed in fulldup mode 2 until t_idle expires.
1063          */
1064
1065         switch (scc->kiss.fulldup)
1066         {
1067                 case KISS_DUPLEX_LINK:
1068                         scc->stat.tx_state = TXS_IDLE2;
1069                         if (scc->kiss.idletime != TIMER_OFF)
1070                         scc_start_tx_timer(scc, t_idle, scc->kiss.idletime*100);
1071                         break;
1072                 case KISS_DUPLEX_OPTIMA:
1073                         scc_notify(scc, HWEV_ALL_SENT);
1074                         break;
1075                 default:
1076                         scc->stat.tx_state = TXS_BUSY;
1077                         scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1078         }
1079
1080         netif_wake_queue(scc->dev);
1081 }
1082
1083
1084 static unsigned char Rand = 17;
1085
1086 static inline int is_grouped(struct scc_channel *scc)
1087 {
1088         int k;
1089         struct scc_channel *scc2;
1090         unsigned char grp1, grp2;
1091
1092         grp1 = scc->kiss.group;
1093
1094         for (k = 0; k < (Nchips * 2); k++)
1095         {
1096                 scc2 = &SCC_Info[k];
1097                 grp2 = scc2->kiss.group;
1098
1099                 if (scc2 == scc || !(scc2->dev && grp2))
1100                         continue;
1101
1102                 if ((grp1 & 0x3f) == (grp2 & 0x3f))
1103                 {
1104                         if ( (grp1 & TXGROUP) && (scc2->wreg[R5] & RTS) )
1105                                 return 1;
1106
1107                         if ( (grp1 & RXGROUP) && scc2->dcd )
1108                                 return 1;
1109                 }
1110         }
1111         return 0;
1112 }
1113
1114 /* DWAIT and SLOTTIME expired
1115  *
1116  * fulldup == 0:  DCD is active or Rand > P-persistence: start t_busy timer
1117  *                else key trx and start txdelay
1118  * fulldup == 1:  key trx and start txdelay
1119  * fulldup == 2:  mintime expired, reset status or key trx and start txdelay
1120  */
1121
1122 static void t_dwait(unsigned long channel)
1123 {
1124         struct scc_channel *scc = (struct scc_channel *) channel;
1125
1126         if (scc->stat.tx_state == TXS_WAIT)     /* maxkeyup or idle timeout */
1127         {
1128                 if (skb_queue_empty(&scc->tx_queue)) {  /* nothing to send */
1129                         scc->stat.tx_state = TXS_IDLE;
1130                         netif_wake_queue(scc->dev);     /* t_maxkeyup locked it. */
1131                         return;
1132                 }
1133
1134                 scc->stat.tx_state = TXS_BUSY;
1135         }
1136
1137         if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1138         {
1139                 Rand = Rand * 17 + 31;
1140
1141                 if (scc->dcd || (scc->kiss.persist) < Rand || (scc->kiss.group && is_grouped(scc)) )
1142                 {
1143                         scc_start_defer(scc);
1144                         scc_start_tx_timer(scc, t_dwait, scc->kiss.slottime);
1145                         return ;
1146                 }
1147         }
1148
1149         if ( !(scc->wreg[R5] & RTS) )
1150         {
1151                 scc_key_trx(scc, TX_ON);
1152                 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1153         } else {
1154                 scc_start_tx_timer(scc, t_txdelay, 0);
1155         }
1156 }
1157
1158
1159 /* TXDELAY expired
1160  *
1161  * kick transmission by a fake scc_txint(scc), start 'maxkeyup' watchdog.
1162  */
1163
1164 static void t_txdelay(unsigned long channel)
1165 {
1166         struct scc_channel *scc = (struct scc_channel *) channel;
1167
1168         scc_start_maxkeyup(scc);
1169
1170         if (scc->tx_buff == NULL)
1171         {
1172                 disable_irq(scc->irq);
1173                 scc_txint(scc);
1174                 enable_irq(scc->irq);
1175         }
1176 }
1177
1178
1179 /* TAILTIME expired
1180  *
1181  * switch off transmitter. If we were stopped by Maxkeyup restart
1182  * transmission after 'mintime' seconds
1183  */
1184
1185 static void t_tail(unsigned long channel)
1186 {
1187         struct scc_channel *scc = (struct scc_channel *) channel;
1188         unsigned long flags;
1189
1190         spin_lock_irqsave(&scc->lock, flags);
1191         del_timer(&scc->tx_wdog);
1192         scc_key_trx(scc, TX_OFF);
1193         spin_unlock_irqrestore(&scc->lock, flags);
1194
1195         if (scc->stat.tx_state == TXS_TIMEOUT)          /* we had a timeout? */
1196         {
1197                 scc->stat.tx_state = TXS_WAIT;
1198                 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1199                 return;
1200         }
1201
1202         scc->stat.tx_state = TXS_IDLE;
1203         netif_wake_queue(scc->dev);
1204 }
1205
1206
1207 /* BUSY timeout
1208  *
1209  * throw away send buffers if DCD remains active too long.
1210  */
1211
1212 static void t_busy(unsigned long channel)
1213 {
1214         struct scc_channel *scc = (struct scc_channel *) channel;
1215
1216         del_timer(&scc->tx_t);
1217         netif_stop_queue(scc->dev);     /* don't pile on the wabbit! */
1218
1219         scc_discard_buffers(scc);
1220         scc->stat.txerrs++;
1221         scc->stat.tx_state = TXS_IDLE;
1222
1223         netif_wake_queue(scc->dev);
1224 }
1225
1226 /* MAXKEYUP timeout
1227  *
1228  * this is our watchdog.
1229  */
1230
1231 static void t_maxkeyup(unsigned long channel)
1232 {
1233         struct scc_channel *scc = (struct scc_channel *) channel;
1234         unsigned long flags;
1235
1236         spin_lock_irqsave(&scc->lock, flags);
1237         /*
1238          * let things settle down before we start to
1239          * accept new data.
1240          */
1241
1242         netif_stop_queue(scc->dev);
1243         scc_discard_buffers(scc);
1244
1245         del_timer(&scc->tx_t);
1246
1247         cl(scc, R1, TxINT_ENAB);        /* force an ABORT, but don't */
1248         cl(scc, R15, TxUIE);            /* count it. */
1249         OutReg(scc->ctrl, R0, RES_Tx_P);
1250
1251         spin_unlock_irqrestore(&scc->lock, flags);
1252
1253         scc->stat.txerrs++;
1254         scc->stat.tx_state = TXS_TIMEOUT;
1255         scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1256 }
1257
1258 /* IDLE timeout
1259  *
1260  * in fulldup mode 2 it keys down the transmitter after 'idle' seconds
1261  * of inactivity. We will not restart transmission before 'mintime'
1262  * expires.
1263  */
1264
1265 static void t_idle(unsigned long channel)
1266 {
1267         struct scc_channel *scc = (struct scc_channel *) channel;
1268
1269         del_timer(&scc->tx_wdog);
1270
1271         scc_key_trx(scc, TX_OFF);
1272         if(scc->kiss.mintime)
1273                 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1274         scc->stat.tx_state = TXS_WAIT;
1275 }
1276
1277 static void scc_init_timer(struct scc_channel *scc)
1278 {
1279         unsigned long flags;
1280
1281         spin_lock_irqsave(&scc->lock, flags);
1282         scc->stat.tx_state = TXS_IDLE;
1283         spin_unlock_irqrestore(&scc->lock, flags);
1284 }
1285
1286
1287 /* ******************************************************************** */
1288 /* *                    Set/get L1 parameters                         * */
1289 /* ******************************************************************** */
1290
1291
1292 /*
1293  * this will set the "hardware" parameters through KISS commands or ioctl()
1294  */
1295
1296 #define CAST(x) (unsigned long)(x)
1297
1298 static unsigned int scc_set_param(struct scc_channel *scc, unsigned int cmd, unsigned int arg)
1299 {
1300         switch (cmd)
1301         {
1302                 case PARAM_TXDELAY:     scc->kiss.txdelay=arg;          break;
1303                 case PARAM_PERSIST:     scc->kiss.persist=arg;          break;
1304                 case PARAM_SLOTTIME:    scc->kiss.slottime=arg;         break;
1305                 case PARAM_TXTAIL:      scc->kiss.tailtime=arg;         break;
1306                 case PARAM_FULLDUP:     scc->kiss.fulldup=arg;          break;
1307                 case PARAM_DTR:         break; /* does someone need this? */
1308                 case PARAM_GROUP:       scc->kiss.group=arg;            break;
1309                 case PARAM_IDLE:        scc->kiss.idletime=arg;         break;
1310                 case PARAM_MIN:         scc->kiss.mintime=arg;          break;
1311                 case PARAM_MAXKEY:      scc->kiss.maxkeyup=arg;         break;
1312                 case PARAM_WAIT:        scc->kiss.waittime=arg;         break;
1313                 case PARAM_MAXDEFER:    scc->kiss.maxdefer=arg;         break;
1314                 case PARAM_TX:          scc->kiss.tx_inhibit=arg;       break;
1315
1316                 case PARAM_SOFTDCD:
1317                         scc->kiss.softdcd=arg;
1318                         if (arg)
1319                         {
1320                                 or(scc, R15, SYNCIE);
1321                                 cl(scc, R15, DCDIE);
1322                                 start_hunt(scc);
1323                         } else {
1324                                 or(scc, R15, DCDIE);
1325                                 cl(scc, R15, SYNCIE);
1326                         }
1327                         break;
1328
1329                 case PARAM_SPEED:
1330                         if (arg < 256)
1331                                 scc->modem.speed=arg*100;
1332                         else
1333                                 scc->modem.speed=arg;
1334
1335                         if (scc->stat.tx_state == 0)    /* only switch baudrate on rx... ;-) */
1336                                 set_speed(scc);
1337                         break;
1338
1339                 case PARAM_RTS:
1340                         if ( !(scc->wreg[R5] & RTS) )
1341                         {
1342                                 if (arg != TX_OFF)
1343                                         scc_key_trx(scc, TX_ON);
1344                                         scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1345                         } else {
1346                                 if (arg == TX_OFF)
1347                                 {
1348                                         scc->stat.tx_state = TXS_BUSY;
1349                                         scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1350                                 }
1351                         }
1352                         break;
1353
1354                 case PARAM_HWEVENT:
1355                         scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
1356                         break;
1357
1358                 default:                return -EINVAL;
1359         }
1360
1361         return 0;
1362 }
1363
1364
1365
1366 static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd)
1367 {
1368         switch (cmd)
1369         {
1370                 case PARAM_TXDELAY:     return CAST(scc->kiss.txdelay);
1371                 case PARAM_PERSIST:     return CAST(scc->kiss.persist);
1372                 case PARAM_SLOTTIME:    return CAST(scc->kiss.slottime);
1373                 case PARAM_TXTAIL:      return CAST(scc->kiss.tailtime);
1374                 case PARAM_FULLDUP:     return CAST(scc->kiss.fulldup);
1375                 case PARAM_SOFTDCD:     return CAST(scc->kiss.softdcd);
1376                 case PARAM_DTR:         return CAST((scc->wreg[R5] & DTR)? 1:0);
1377                 case PARAM_RTS:         return CAST((scc->wreg[R5] & RTS)? 1:0);
1378                 case PARAM_SPEED:       return CAST(scc->modem.speed);
1379                 case PARAM_GROUP:       return CAST(scc->kiss.group);
1380                 case PARAM_IDLE:        return CAST(scc->kiss.idletime);
1381                 case PARAM_MIN:         return CAST(scc->kiss.mintime);
1382                 case PARAM_MAXKEY:      return CAST(scc->kiss.maxkeyup);
1383                 case PARAM_WAIT:        return CAST(scc->kiss.waittime);
1384                 case PARAM_MAXDEFER:    return CAST(scc->kiss.maxdefer);
1385                 case PARAM_TX:          return CAST(scc->kiss.tx_inhibit);
1386                 default:                return NO_SUCH_PARAM;
1387         }
1388
1389 }
1390
1391 #undef CAST
1392
1393 /* ******************************************************************* */
1394 /* *                    Send calibration pattern                     * */
1395 /* ******************************************************************* */
1396
1397 static void scc_stop_calibrate(unsigned long channel)
1398 {
1399         struct scc_channel *scc = (struct scc_channel *) channel;
1400         unsigned long flags;
1401
1402         spin_lock_irqsave(&scc->lock, flags);
1403         del_timer(&scc->tx_wdog);
1404         scc_key_trx(scc, TX_OFF);
1405         wr(scc, R6, 0);
1406         wr(scc, R7, FLAG);
1407         Outb(scc->ctrl,RES_EXT_INT);    /* reset ext/status interrupts */
1408         Outb(scc->ctrl,RES_EXT_INT);
1409
1410         netif_wake_queue(scc->dev);
1411         spin_unlock_irqrestore(&scc->lock, flags);
1412 }
1413
1414
1415 static void
1416 scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern)
1417 {
1418         unsigned long flags;
1419
1420         spin_lock_irqsave(&scc->lock, flags);
1421         netif_stop_queue(scc->dev);
1422         scc_discard_buffers(scc);
1423
1424         del_timer(&scc->tx_wdog);
1425
1426         scc->tx_wdog.data = (unsigned long) scc;
1427         scc->tx_wdog.function = scc_stop_calibrate;
1428         scc->tx_wdog.expires = jiffies + HZ*duration;
1429         add_timer(&scc->tx_wdog);
1430
1431         /* This doesn't seem to work. Why not? */
1432         wr(scc, R6, 0);
1433         wr(scc, R7, pattern);
1434
1435         /*
1436          * Don't know if this works.
1437          * Damn, where is my Z8530 programming manual...?
1438          */
1439
1440         Outb(scc->ctrl,RES_EXT_INT);    /* reset ext/status interrupts */
1441         Outb(scc->ctrl,RES_EXT_INT);
1442
1443         scc_key_trx(scc, TX_ON);
1444         spin_unlock_irqrestore(&scc->lock, flags);
1445 }
1446
1447 /* ******************************************************************* */
1448 /* *            Init channel structures, special HW, etc...          * */
1449 /* ******************************************************************* */
1450
1451 /*
1452  * Reset the Z8530s and setup special hardware
1453  */
1454
1455 static void z8530_init(void)
1456 {
1457         struct scc_channel *scc;
1458         int chip, k;
1459         unsigned long flags;
1460         char *flag;
1461
1462
1463         printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2);
1464
1465         flag=" ";
1466         for (k = 0; k < NR_IRQS; k++)
1467                 if (Ivec[k].used)
1468                 {
1469                         printk("%s%d", flag, k);
1470                         flag=",";
1471                 }
1472         printk("\n");
1473
1474
1475         /* reset and pre-init all chips in the system */
1476         for (chip = 0; chip < Nchips; chip++)
1477         {
1478                 scc=&SCC_Info[2*chip];
1479                 if (!scc->ctrl) continue;
1480
1481                 /* Special SCC cards */
1482
1483                 if(scc->brand & EAGLE)                  /* this is an EAGLE card */
1484                         Outb(scc->special,0x08);        /* enable interrupt on the board */
1485
1486                 if(scc->brand & (PC100 | PRIMUS))       /* this is a PC100/PRIMUS card */
1487                         Outb(scc->special,scc->option); /* set the MODEM mode (0x22) */
1488
1489
1490                 /* Reset and pre-init Z8530 */
1491
1492                 spin_lock_irqsave(&scc->lock, flags);
1493
1494                 Outb(scc->ctrl, 0);
1495                 OutReg(scc->ctrl,R9,FHWRES);            /* force hardware reset */
1496                 udelay(100);                            /* give it 'a bit' more time than required */
1497                 wr(scc, R2, chip*16);                   /* interrupt vector */
1498                 wr(scc, R9, VIS);                       /* vector includes status */
1499                 spin_unlock_irqrestore(&scc->lock, flags);
1500         }
1501
1502
1503         Driver_Initialized = 1;
1504 }
1505
1506 /*
1507  * Allocate device structure, err, instance, and register driver
1508  */
1509
1510 static int scc_net_alloc(const char *name, struct scc_channel *scc)
1511 {
1512         int err;
1513         struct net_device *dev;
1514
1515         dev = alloc_netdev(0, name, scc_net_setup);
1516         if (!dev)
1517                 return -ENOMEM;
1518
1519         dev->priv = scc;
1520         scc->dev = dev;
1521         spin_lock_init(&scc->lock);
1522         init_timer(&scc->tx_t);
1523         init_timer(&scc->tx_wdog);
1524
1525         err = register_netdevice(dev);
1526         if (err) {
1527                 printk(KERN_ERR "%s: can't register network device (%d)\n",
1528                        name, err);
1529                 free_netdev(dev);
1530                 scc->dev = NULL;
1531                 return err;
1532         }
1533
1534         return 0;
1535 }
1536
1537
1538
1539 /* ******************************************************************** */
1540 /* *                        Network driver methods                    * */
1541 /* ******************************************************************** */
1542
1543 /* ----> Initialize device <----- */
1544
1545 static void scc_net_setup(struct net_device *dev)
1546 {
1547         dev->tx_queue_len    = 16;      /* should be enough... */
1548
1549         dev->open            = scc_net_open;
1550         dev->stop            = scc_net_close;
1551
1552         dev->hard_start_xmit = scc_net_tx;
1553         dev->hard_header     = ax25_hard_header;
1554         dev->rebuild_header  = ax25_rebuild_header;
1555         dev->set_mac_address = scc_net_set_mac_address;
1556         dev->get_stats       = scc_net_get_stats;
1557         dev->do_ioctl        = scc_net_ioctl;
1558         dev->tx_timeout      = NULL;
1559
1560         memcpy(dev->broadcast, &ax25_bcast,  AX25_ADDR_LEN);
1561         memcpy(dev->dev_addr,  &ax25_defaddr, AX25_ADDR_LEN);
1562
1563         dev->flags      = 0;
1564
1565         dev->type = ARPHRD_AX25;
1566         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1567         dev->mtu = AX25_DEF_PACLEN;
1568         dev->addr_len = AX25_ADDR_LEN;
1569
1570 }
1571
1572 /* ----> open network device <---- */
1573
1574 static int scc_net_open(struct net_device *dev)
1575 {
1576         struct scc_channel *scc = (struct scc_channel *) dev->priv;
1577
1578         if (!scc->init)
1579                 return -EINVAL;
1580
1581         scc->tx_buff = NULL;
1582         skb_queue_head_init(&scc->tx_queue);
1583
1584         init_channel(scc);
1585
1586         netif_start_queue(dev);
1587         return 0;
1588 }
1589
1590 /* ----> close network device <---- */
1591
1592 static int scc_net_close(struct net_device *dev)
1593 {
1594         struct scc_channel *scc = (struct scc_channel *) dev->priv;
1595         unsigned long flags;
1596
1597         netif_stop_queue(dev);
1598
1599         spin_lock_irqsave(&scc->lock, flags);
1600         Outb(scc->ctrl,0);              /* Make sure pointer is written */
1601         wr(scc,R1,0);                   /* disable interrupts */
1602         wr(scc,R3,0);
1603         spin_unlock_irqrestore(&scc->lock, flags);
1604
1605         del_timer_sync(&scc->tx_t);
1606         del_timer_sync(&scc->tx_wdog);
1607
1608         scc_discard_buffers(scc);
1609
1610         return 0;
1611 }
1612
1613 /* ----> receive frame, called from scc_rxint() <---- */
1614
1615 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
1616 {
1617         if (skb->len == 0) {
1618                 dev_kfree_skb_irq(skb);
1619                 return;
1620         }
1621
1622         scc->dev_stat.rx_packets++;
1623         scc->dev_stat.rx_bytes += skb->len;
1624
1625         skb->protocol = ax25_type_trans(skb, scc->dev);
1626
1627         netif_rx(skb);
1628         scc->dev->last_rx = jiffies;
1629         return;
1630 }
1631
1632 /* ----> transmit frame <---- */
1633
1634 static int scc_net_tx(struct sk_buff *skb, struct net_device *dev)
1635 {
1636         struct scc_channel *scc = (struct scc_channel *) dev->priv;
1637         unsigned long flags;
1638         char kisscmd;
1639
1640         if (skb->len > scc->stat.bufsize || skb->len < 2) {
1641                 scc->dev_stat.tx_dropped++;     /* bogus frame */
1642                 dev_kfree_skb(skb);
1643                 return 0;
1644         }
1645
1646         scc->dev_stat.tx_packets++;
1647         scc->dev_stat.tx_bytes += skb->len;
1648         scc->stat.txframes++;
1649
1650         kisscmd = *skb->data & 0x1f;
1651         skb_pull(skb, 1);
1652
1653         if (kisscmd) {
1654                 scc_set_param(scc, kisscmd, *skb->data);
1655                 dev_kfree_skb(skb);
1656                 return 0;
1657         }
1658
1659         spin_lock_irqsave(&scc->lock, flags);
1660
1661         if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
1662                 struct sk_buff *skb_del;
1663                 skb_del = skb_dequeue(&scc->tx_queue);
1664                 dev_kfree_skb(skb_del);
1665         }
1666         skb_queue_tail(&scc->tx_queue, skb);
1667         dev->trans_start = jiffies;
1668
1669
1670         /*
1671          * Start transmission if the trx state is idle or
1672          * t_idle hasn't expired yet. Use dwait/persistence/slottime
1673          * algorithm for normal halfduplex operation.
1674          */
1675
1676         if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) {
1677                 scc->stat.tx_state = TXS_BUSY;
1678                 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1679                         __scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime);
1680                 else
1681                         __scc_start_tx_timer(scc, t_dwait, 0);
1682         }
1683         spin_unlock_irqrestore(&scc->lock, flags);
1684         return 0;
1685 }
1686
1687 /* ----> ioctl functions <---- */
1688
1689 /*
1690  * SIOCSCCCFG           - configure driver      arg: (struct scc_hw_config *) arg
1691  * SIOCSCCINI           - initialize driver     arg: ---
1692  * SIOCSCCCHANINI       - initialize channel    arg: (struct scc_modem *) arg
1693  * SIOCSCCSMEM          - set memory            arg: (struct scc_mem_config *) arg
1694  * SIOCSCCGKISS         - get level 1 parameter arg: (struct scc_kiss_cmd *) arg
1695  * SIOCSCCSKISS         - set level 1 parameter arg: (struct scc_kiss_cmd *) arg
1696  * SIOCSCCGSTAT         - get driver status     arg: (struct scc_stat *) arg
1697  * SIOCSCCCAL           - send calib. pattern   arg: (struct scc_calibrate *) arg
1698  */
1699
1700 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1701 {
1702         struct scc_kiss_cmd kiss_cmd;
1703         struct scc_mem_config memcfg;
1704         struct scc_hw_config hwcfg;
1705         struct scc_calibrate cal;
1706         struct scc_channel *scc = (struct scc_channel *) dev->priv;
1707         int chan;
1708         unsigned char device_name[IFNAMSIZ];
1709         void __user *arg = ifr->ifr_data;
1710
1711
1712         if (!Driver_Initialized)
1713         {
1714                 if (cmd == SIOCSCCCFG)
1715                 {
1716                         int found = 1;
1717
1718                         if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1719                         if (!arg) return -EFAULT;
1720
1721                         if (Nchips >= SCC_MAXCHIPS)
1722                                 return -EINVAL;
1723
1724                         if (copy_from_user(&hwcfg, arg, sizeof(hwcfg)))
1725                                 return -EFAULT;
1726
1727                         if (hwcfg.irq == 2) hwcfg.irq = 9;
1728
1729                         if (hwcfg.irq < 0 || hwcfg.irq >= NR_IRQS)
1730                                 return -EINVAL;
1731
1732                         if (!Ivec[hwcfg.irq].used && hwcfg.irq)
1733                         {
1734                                 if (request_irq(hwcfg.irq, scc_isr, IRQF_DISABLED, "AX.25 SCC", NULL))
1735                                         printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq);
1736                                 else
1737                                         Ivec[hwcfg.irq].used = 1;
1738                         }
1739
1740                         if (hwcfg.vector_latch && !Vector_Latch) {
1741                                 if (!request_region(hwcfg.vector_latch, 1, "scc vector latch"))
1742                                         printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch);
1743                                 else
1744                                         Vector_Latch = hwcfg.vector_latch;
1745                         }
1746
1747                         if (hwcfg.clock == 0)
1748                                 hwcfg.clock = SCC_DEFAULT_CLOCK;
1749
1750 #ifndef SCC_DONT_CHECK
1751
1752                         if(request_region(hwcfg.ctrl_a, 1, "scc-probe"))
1753                         {
1754                                 disable_irq(hwcfg.irq);
1755                                 Outb(hwcfg.ctrl_a, 0);
1756                                 OutReg(hwcfg.ctrl_a, R9, FHWRES);
1757                                 udelay(100);
1758                                 OutReg(hwcfg.ctrl_a,R13,0x55);          /* is this chip really there? */
1759                                 udelay(5);
1760
1761                                 if (InReg(hwcfg.ctrl_a,R13) != 0x55)
1762                                         found = 0;
1763                                 enable_irq(hwcfg.irq);
1764                                 release_region(hwcfg.ctrl_a, 1);
1765                         }
1766                         else
1767                                 found = 0;
1768 #endif
1769
1770                         if (found)
1771                         {
1772                                 SCC_Info[2*Nchips  ].ctrl = hwcfg.ctrl_a;
1773                                 SCC_Info[2*Nchips  ].data = hwcfg.data_a;
1774                                 SCC_Info[2*Nchips  ].irq  = hwcfg.irq;
1775                                 SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b;
1776                                 SCC_Info[2*Nchips+1].data = hwcfg.data_b;
1777                                 SCC_Info[2*Nchips+1].irq  = hwcfg.irq;
1778
1779                                 SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a;
1780                                 SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b;
1781                                 SCC_ctrl[Nchips].irq    = hwcfg.irq;
1782                         }
1783
1784
1785                         for (chan = 0; chan < 2; chan++)
1786                         {
1787                                 sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan);
1788
1789                                 SCC_Info[2*Nchips+chan].special = hwcfg.special;
1790                                 SCC_Info[2*Nchips+chan].clock = hwcfg.clock;
1791                                 SCC_Info[2*Nchips+chan].brand = hwcfg.brand;
1792                                 SCC_Info[2*Nchips+chan].option = hwcfg.option;
1793                                 SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc;
1794
1795 #ifdef SCC_DONT_CHECK
1796                                 printk(KERN_INFO "%s: data port = 0x%3.3x  control port = 0x%3.3x\n",
1797                                         device_name,
1798                                         SCC_Info[2*Nchips+chan].data,
1799                                         SCC_Info[2*Nchips+chan].ctrl);
1800
1801 #else
1802                                 printk(KERN_INFO "%s: data port = 0x%3.3lx  control port = 0x%3.3lx -- %s\n",
1803                                         device_name,
1804                                         chan? hwcfg.data_b : hwcfg.data_a,
1805                                         chan? hwcfg.ctrl_b : hwcfg.ctrl_a,
1806                                         found? "found" : "missing");
1807 #endif
1808
1809                                 if (found)
1810                                 {
1811                                         request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl");
1812                                         request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data");
1813                                         if (Nchips+chan != 0 &&
1814                                             scc_net_alloc(device_name,
1815                                                           &SCC_Info[2*Nchips+chan]))
1816                                             return -EINVAL;
1817                                 }
1818                         }
1819
1820                         if (found) Nchips++;
1821
1822                         return 0;
1823                 }
1824
1825                 if (cmd == SIOCSCCINI)
1826                 {
1827                         if (!capable(CAP_SYS_RAWIO))
1828                                 return -EPERM;
1829
1830                         if (Nchips == 0)
1831                                 return -EINVAL;
1832
1833                         z8530_init();
1834                         return 0;
1835                 }
1836
1837                 return -EINVAL; /* confuse the user */
1838         }
1839
1840         if (!scc->init)
1841         {
1842                 if (cmd == SIOCSCCCHANINI)
1843                 {
1844                         if (!capable(CAP_NET_ADMIN)) return -EPERM;
1845                         if (!arg) return -EINVAL;
1846
1847                         scc->stat.bufsize   = SCC_BUFSIZE;
1848
1849                         if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem)))
1850                                 return -EINVAL;
1851
1852                         /* default KISS Params */
1853
1854                         if (scc->modem.speed < 4800)
1855                         {
1856                                 scc->kiss.txdelay = 36;         /* 360 ms */
1857                                 scc->kiss.persist = 42;         /* 25% persistence */                   /* was 25 */
1858                                 scc->kiss.slottime = 16;        /* 160 ms */
1859                                 scc->kiss.tailtime = 4;         /* minimal reasonable value */
1860                                 scc->kiss.fulldup = 0;          /* CSMA */
1861                                 scc->kiss.waittime = 50;        /* 500 ms */
1862                                 scc->kiss.maxkeyup = 10;        /* 10 s */
1863                                 scc->kiss.mintime = 3;          /* 3 s */
1864                                 scc->kiss.idletime = 30;        /* 30 s */
1865                                 scc->kiss.maxdefer = 120;       /* 2 min */
1866                                 scc->kiss.softdcd = 0;          /* hardware dcd */
1867                         } else {
1868                                 scc->kiss.txdelay = 10;         /* 100 ms */
1869                                 scc->kiss.persist = 64;         /* 25% persistence */                   /* was 25 */
1870                                 scc->kiss.slottime = 8;         /* 160 ms */
1871                                 scc->kiss.tailtime = 1;         /* minimal reasonable value */
1872                                 scc->kiss.fulldup = 0;          /* CSMA */
1873                                 scc->kiss.waittime = 50;        /* 500 ms */
1874                                 scc->kiss.maxkeyup = 7;         /* 7 s */
1875                                 scc->kiss.mintime = 3;          /* 3 s */
1876                                 scc->kiss.idletime = 30;        /* 30 s */
1877                                 scc->kiss.maxdefer = 120;       /* 2 min */
1878                                 scc->kiss.softdcd = 0;          /* hardware dcd */
1879                         }
1880
1881                         scc->tx_buff = NULL;
1882                         skb_queue_head_init(&scc->tx_queue);
1883                         scc->init = 1;
1884
1885                         return 0;
1886                 }
1887
1888                 return -EINVAL;
1889         }
1890
1891         switch(cmd)
1892         {
1893                 case SIOCSCCRESERVED:
1894                         return -ENOIOCTLCMD;
1895
1896                 case SIOCSCCSMEM:
1897                         if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1898                         if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg)))
1899                                 return -EINVAL;
1900                         scc->stat.bufsize   = memcfg.bufsize;
1901                         return 0;
1902
1903                 case SIOCSCCGSTAT:
1904                         if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat)))
1905                                 return -EINVAL;
1906                         return 0;
1907
1908                 case SIOCSCCGKISS:
1909                         if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1910                                 return -EINVAL;
1911                         kiss_cmd.param = scc_get_param(scc, kiss_cmd.command);
1912                         if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd)))
1913                                 return -EINVAL;
1914                         return 0;
1915
1916                 case SIOCSCCSKISS:
1917                         if (!capable(CAP_NET_ADMIN)) return -EPERM;
1918                         if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1919                                 return -EINVAL;
1920                         return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param);
1921
1922                 case SIOCSCCCAL:
1923                         if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1924                         if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0)
1925                                 return -EINVAL;
1926
1927                         scc_start_calibrate(scc, cal.time, cal.pattern);
1928                         return 0;
1929
1930                 default:
1931                         return -ENOIOCTLCMD;
1932
1933         }
1934
1935         return -EINVAL;
1936 }
1937
1938 /* ----> set interface callsign <---- */
1939
1940 static int scc_net_set_mac_address(struct net_device *dev, void *addr)
1941 {
1942         struct sockaddr *sa = (struct sockaddr *) addr;
1943         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1944         return 0;
1945 }
1946
1947 /* ----> get statistics <---- */
1948
1949 static struct net_device_stats *scc_net_get_stats(struct net_device *dev)
1950 {
1951         struct scc_channel *scc = (struct scc_channel *) dev->priv;
1952
1953         scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over;
1954         scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under;
1955         scc->dev_stat.rx_fifo_errors = scc->stat.rx_over;
1956         scc->dev_stat.tx_fifo_errors = scc->stat.tx_under;
1957
1958         return &scc->dev_stat;
1959 }
1960
1961 /* ******************************************************************** */
1962 /* *            dump statistics to /proc/net/z8530drv                 * */
1963 /* ******************************************************************** */
1964
1965 #ifdef CONFIG_PROC_FS
1966
1967 static inline struct scc_channel *scc_net_seq_idx(loff_t pos)
1968 {
1969         int k;
1970
1971         for (k = 0; k < Nchips*2; ++k) {
1972                 if (!SCC_Info[k].init)
1973                         continue;
1974                 if (pos-- == 0)
1975                         return &SCC_Info[k];
1976         }
1977         return NULL;
1978 }
1979
1980 static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos)
1981 {
1982         return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1983
1984 }
1985
1986 static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1987 {
1988         unsigned k;
1989         struct scc_channel *scc = v;
1990         ++*pos;
1991
1992         for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1;
1993              k < Nchips*2; ++k) {
1994                 if (SCC_Info[k].init)
1995                         return &SCC_Info[k];
1996         }
1997         return NULL;
1998 }
1999
2000 static void scc_net_seq_stop(struct seq_file *seq, void *v)
2001 {
2002 }
2003
2004 static int scc_net_seq_show(struct seq_file *seq, void *v)
2005 {
2006         if (v == SEQ_START_TOKEN) {
2007                 seq_puts(seq, "z8530drv-"VERSION"\n");
2008         } else if (!Driver_Initialized) {
2009                 seq_puts(seq, "not initialized\n");
2010         } else if (!Nchips) {
2011                 seq_puts(seq, "chips missing\n");
2012         } else {
2013                 const struct scc_channel *scc = v;
2014                 const struct scc_stat *stat = &scc->stat;
2015                 const struct scc_kiss *kiss = &scc->kiss;
2016
2017
2018                 /* dev  data ctrl irq clock brand enh vector special option
2019                  *      baud nrz clocksrc softdcd bufsize
2020                  *      rxints txints exints spints
2021                  *      rcvd rxerrs over / xmit txerrs under / nospace bufsize
2022                  *      txd pers slot tail ful wait min maxk idl defr txof grp
2023                  *      W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
2024                  *      R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ##
2025                  */
2026
2027                 seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n",
2028                                 scc->dev->name,
2029                                 scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand,
2030                                 scc->enhanced, Vector_Latch, scc->special,
2031                                 scc->option);
2032                 seq_printf(seq, "\t%lu %d %d %d %d\n",
2033                                 scc->modem.speed, scc->modem.nrz,
2034                                 scc->modem.clocksrc, kiss->softdcd,
2035                                 stat->bufsize);
2036                 seq_printf(seq, "\t%lu %lu %lu %lu\n",
2037                                 stat->rxints, stat->txints, stat->exints, stat->spints);
2038                 seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n",
2039                                 stat->rxframes, stat->rxerrs, stat->rx_over,
2040                                 stat->txframes, stat->txerrs, stat->tx_under,
2041                                 stat->nospace,  stat->tx_state);
2042
2043 #define K(x) kiss->x
2044                 seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n",
2045                                 K(txdelay), K(persist), K(slottime), K(tailtime),
2046                                 K(fulldup), K(waittime), K(mintime), K(maxkeyup),
2047                                 K(idletime), K(maxdefer), K(tx_inhibit), K(group));
2048 #undef K
2049 #ifdef SCC_DEBUG
2050                 {
2051                         int reg;
2052
2053                 seq_printf(seq, "\tW ");
2054                         for (reg = 0; reg < 16; reg++)
2055                                 seq_printf(seq, "%2.2x ", scc->wreg[reg]);
2056                         seq_printf(seq, "\n");
2057
2058                 seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1));
2059                         for (reg = 3; reg < 8; reg++)
2060                                 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2061                         seq_printf(seq, "XX ");
2062                         for (reg = 9; reg < 16; reg++)
2063                                 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2064                         seq_printf(seq, "\n");
2065                 }
2066 #endif
2067                 seq_putc(seq, '\n');
2068         }
2069
2070         return 0;
2071 }
2072
2073 static struct seq_operations scc_net_seq_ops = {
2074         .start  = scc_net_seq_start,
2075         .next   = scc_net_seq_next,
2076         .stop   = scc_net_seq_stop,
2077         .show   = scc_net_seq_show,
2078 };
2079
2080
2081 static int scc_net_seq_open(struct inode *inode, struct file *file)
2082 {
2083         return seq_open(file, &scc_net_seq_ops);
2084 }
2085
2086 static const struct file_operations scc_net_seq_fops = {
2087         .owner   = THIS_MODULE,
2088         .open    = scc_net_seq_open,
2089         .read    = seq_read,
2090         .llseek  = seq_lseek,
2091         .release = seq_release_private,
2092 };
2093
2094 #endif /* CONFIG_PROC_FS */
2095
2096
2097 /* ******************************************************************** */
2098 /* *                    Init SCC driver                               * */
2099 /* ******************************************************************** */
2100
2101 static int __init scc_init_driver (void)
2102 {
2103         char devname[IFNAMSIZ];
2104
2105         printk(banner);
2106
2107         sprintf(devname,"%s0", SCC_DriverName);
2108
2109         rtnl_lock();
2110         if (scc_net_alloc(devname, SCC_Info)) {
2111                 rtnl_unlock();
2112                 printk(KERN_ERR "z8530drv: cannot initialize module\n");
2113                 return -EIO;
2114         }
2115         rtnl_unlock();
2116
2117         proc_net_fops_create("z8530drv", 0, &scc_net_seq_fops);
2118
2119         return 0;
2120 }
2121
2122 static void __exit scc_cleanup_driver(void)
2123 {
2124         io_port ctrl;
2125         int k;
2126         struct scc_channel *scc;
2127         struct net_device *dev;
2128
2129         if (Nchips == 0 && (dev = SCC_Info[0].dev))
2130         {
2131                 unregister_netdev(dev);
2132                 free_netdev(dev);
2133         }
2134
2135         /* Guard against chip prattle */
2136         local_irq_disable();
2137
2138         for (k = 0; k < Nchips; k++)
2139                 if ( (ctrl = SCC_ctrl[k].chan_A) )
2140                 {
2141                         Outb(ctrl, 0);
2142                         OutReg(ctrl,R9,FHWRES); /* force hardware reset */
2143                         udelay(50);
2144                 }
2145
2146         /* To unload the port must be closed so no real IRQ pending */
2147         for (k=0; k < NR_IRQS ; k++)
2148                 if (Ivec[k].used) free_irq(k, NULL);
2149
2150         local_irq_enable();
2151
2152         /* Now clean up */
2153         for (k = 0; k < Nchips*2; k++)
2154         {
2155                 scc = &SCC_Info[k];
2156                 if (scc->ctrl)
2157                 {
2158                         release_region(scc->ctrl, 1);
2159                         release_region(scc->data, 1);
2160                 }
2161                 if (scc->dev)
2162                 {
2163                         unregister_netdev(scc->dev);
2164                         free_netdev(scc->dev);
2165                 }
2166         }
2167
2168
2169         if (Vector_Latch)
2170                 release_region(Vector_Latch, 1);
2171
2172         proc_net_remove("z8530drv");
2173 }
2174
2175 MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>");
2176 MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards");
2177 MODULE_SUPPORTED_DEVICE("Z8530 based SCC cards for Amateur Radio");
2178 MODULE_LICENSE("GPL");
2179 module_init(scc_init_driver);
2180 module_exit(scc_cleanup_driver);