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/net_namespace.h>
 178 #include <net/ax25.h>
 179
 180 #include <asm/irq.h>
 181 #include <asm/system.h>
 182 #include <asm/io.h>
 183 #include <asm/uaccess.h>
 184
 185 #include "z8530.h"
 186
 187 static const char banner[] __initdata = KERN_INFO \
 188         "AX.25: Z8530 SCC driver version "VERSION".dl1bke\n";
 189
 190 static void t_dwait(unsigned long);
 191 static void t_txdelay(unsigned long);
 192 static void t_tail(unsigned long);
 193 static void t_busy(unsigned long);
 194 static void t_maxkeyup(unsigned long);
 195 static void t_idle(unsigned long);
 196 static void scc_tx_done(struct scc_channel *);
 197 static void scc_start_tx_timer(struct scc_channel *, void (*)(unsigned long), unsigned long);
 198 static void scc_start_maxkeyup(struct scc_channel *);
 199 static void scc_start_defer(struct scc_channel *);
 200
 201 static void z8530_init(void);
 202
 203 static void init_channel(struct scc_channel *scc);
 204 static void scc_key_trx (struct scc_channel *scc, char tx);
 205 static void scc_init_timer(struct scc_channel *scc);
 206
 207 static int scc_net_alloc(const char *name, struct scc_channel *scc);
 208 static void scc_net_setup(struct net_device *dev);
 209 static int scc_net_open(struct net_device *dev);
 210 static int scc_net_close(struct net_device *dev);
 211 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb);
 212 static netdev_tx_t scc_net_tx(struct sk_buff *skb,
 213                               struct net_device *dev);
 214 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
 215 static int scc_net_set_mac_address(struct net_device *dev, void *addr);
 216 static struct net_device_stats * scc_net_get_stats(struct net_device *dev);
 217
 218 static unsigned char SCC_DriverName[] = "scc";
 219
 220 static struct irqflags { unsigned char used : 1; } Ivec[NR_IRQS];
 221
 222 static struct scc_channel SCC_Info[2 * SCC_MAXCHIPS];   /* information per channel */
 223
 224 static struct scc_ctrl {
 225         io_port chan_A;
 226         io_port chan_B;
 227         int irq;
 228 } SCC_ctrl[SCC_MAXCHIPS+1];
 229
 230 static unsigned char Driver_Initialized;
 231 static int Nchips;
 232 static io_port Vector_Latch;
 233
 234
 235 /* ******************************************************************** */
 236 /* *                    Port Access Functions                         * */
 237 /* ******************************************************************** */
 238
 239 /* These provide interrupt save 2-step access to the Z8530 registers */
 240
 241 static DEFINE_SPINLOCK(iolock); /* Guards paired accesses */
 242
 243 static inline unsigned char InReg(io_port port, unsigned char reg)
 244 {
 245         unsigned long flags;
 246         unsigned char r;
 247
 248         spin_lock_irqsave(&iolock, flags);
 249 #ifdef SCC_LDELAY
 250         Outb(port, reg);
 251         udelay(SCC_LDELAY);
 252         r=Inb(port);
 253         udelay(SCC_LDELAY);
 254 #else
 255         Outb(port, reg);
 256         r=Inb(port);
 257 #endif
 258         spin_unlock_irqrestore(&iolock, flags);
 259         return r;
 260 }
 261
 262 static inline void OutReg(io_port port, unsigned char reg, unsigned char val)
 263 {
 264         unsigned long flags;
 265
 266         spin_lock_irqsave(&iolock, flags);
 267 #ifdef SCC_LDELAY
 268         Outb(port, reg); udelay(SCC_LDELAY);
 269         Outb(port, val); udelay(SCC_LDELAY);
 270 #else
 271         Outb(port, reg);
 272         Outb(port, val);
 273 #endif
 274         spin_unlock_irqrestore(&iolock, flags);
 275 }
 276
 277 static inline void wr(struct scc_channel *scc, unsigned char reg,
 278         unsigned char val)
 279 {
 280         OutReg(scc->ctrl, reg, (scc->wreg[reg] = val));
 281 }
 282
 283 static inline void or(struct scc_channel *scc, unsigned char reg, unsigned char val)
 284 {
 285         OutReg(scc->ctrl, reg, (scc->wreg[reg] |= val));
 286 }
 287
 288 static inline void cl(struct scc_channel *scc, unsigned char reg, unsigned char val)
 289 {
 290         OutReg(scc->ctrl, reg, (scc->wreg[reg] &= ~val));
 291 }
 292
 293 /* ******************************************************************** */
 294 /* *                    Some useful macros                            * */
 295 /* ******************************************************************** */
 296
 297 static inline void scc_discard_buffers(struct scc_channel *scc)
 298 {
 299         unsigned long flags;
 300
 301         spin_lock_irqsave(&scc->lock, flags);
 302         if (scc->tx_buff != NULL)
 303         {
 304                 dev_kfree_skb(scc->tx_buff);
 305                 scc->tx_buff = NULL;
 306         }
 307
 308         while (!skb_queue_empty(&scc->tx_queue))
 309                 dev_kfree_skb(skb_dequeue(&scc->tx_queue));
 310
 311         spin_unlock_irqrestore(&scc->lock, flags);
 312 }
 313
 314
 315
 316 /* ******************************************************************** */
 317 /* *                    Interrupt Service Routines                    * */
 318 /* ******************************************************************** */
 319
 320
 321 /* ----> subroutines for the interrupt handlers <---- */
 322
 323 static inline void scc_notify(struct scc_channel *scc, int event)
 324 {
 325         struct sk_buff *skb;
 326         char *bp;
 327
 328         if (scc->kiss.fulldup != KISS_DUPLEX_OPTIMA)
 329                 return;
 330
 331         skb = dev_alloc_skb(2);
 332         if (skb != NULL)
 333         {
 334                 bp = skb_put(skb, 2);
 335                 *bp++ = PARAM_HWEVENT;
 336                 *bp++ = event;
 337                 scc_net_rx(scc, skb);
 338         } else
 339                 scc->stat.nospace++;
 340 }
 341
 342 static inline void flush_rx_FIFO(struct scc_channel *scc)
 343 {
 344         int k;
 345
 346         for (k=0; k<3; k++)
 347                 Inb(scc->data);
 348
 349         if(scc->rx_buff != NULL)                /* did we receive something? */
 350         {
 351                 scc->stat.rxerrs++;  /* then count it as an error */
 352                 dev_kfree_skb_irq(scc->rx_buff);
 353                 scc->rx_buff = NULL;
 354         }
 355 }
 356
 357 static void start_hunt(struct scc_channel *scc)
 358 {
 359         if ((scc->modem.clocksrc != CLK_EXTERNAL))
 360                 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
 361         or(scc,R3,ENT_HM|RxENABLE);  /* enable the receiver, hunt mode */
 362 }
 363
 364 /* ----> four different interrupt handlers for Tx, Rx, changing of      */
 365 /*       DCD/CTS and Rx/Tx errors                                       */
 366
 367 /* Transmitter interrupt handler */
 368 static inline void scc_txint(struct scc_channel *scc)
 369 {
 370         struct sk_buff *skb;
 371
 372         scc->stat.txints++;
 373         skb = scc->tx_buff;
 374
 375         /* send first octet */
 376
 377         if (skb == NULL)
 378         {
 379                 skb = skb_dequeue(&scc->tx_queue);
 380                 scc->tx_buff = skb;
 381                 netif_wake_queue(scc->dev);
 382
 383                 if (skb == NULL)
 384                 {
 385                         scc_tx_done(scc);
 386                         Outb(scc->ctrl, RES_Tx_P);
 387                         return;
 388                 }
 389
 390                 if (skb->len == 0)              /* Paranoia... */
 391                 {
 392                         dev_kfree_skb_irq(skb);
 393                         scc->tx_buff = NULL;
 394                         scc_tx_done(scc);
 395                         Outb(scc->ctrl, RES_Tx_P);
 396                         return;
 397                 }
 398
 399                 scc->stat.tx_state = TXS_ACTIVE;
 400
 401                 OutReg(scc->ctrl, R0, RES_Tx_CRC);
 402                                                 /* reset CRC generator */
 403                 or(scc,R10,ABUNDER);            /* re-install underrun protection */
 404                 Outb(scc->data,*skb->data);     /* send byte */
 405                 skb_pull(skb, 1);
 406
 407                 if (!scc->enhanced)             /* reset EOM latch */
 408                         Outb(scc->ctrl,RES_EOM_L);
 409                 return;
 410         }
 411
 412         /* End Of Frame... */
 413
 414         if (skb->len == 0)
 415         {
 416                 Outb(scc->ctrl, RES_Tx_P);      /* reset pending int */
 417                 cl(scc, R10, ABUNDER);          /* send CRC */
 418                 dev_kfree_skb_irq(skb);
 419                 scc->tx_buff = NULL;
 420                 scc->stat.tx_state = TXS_NEWFRAME; /* next frame... */
 421                 return;
 422         }
 423
 424         /* send octet */
 425
 426         Outb(scc->data,*skb->data);
 427         skb_pull(skb, 1);
 428 }
 429
 430
 431 /* External/Status interrupt handler */
 432 static inline void scc_exint(struct scc_channel *scc)
 433 {
 434         unsigned char status,changes,chg_and_stat;
 435
 436         scc->stat.exints++;
 437
 438         status = InReg(scc->ctrl,R0);
 439         changes = status ^ scc->status;
 440         chg_and_stat = changes & status;
 441
 442         /* ABORT: generated whenever DCD drops while receiving */
 443
 444         if (chg_and_stat & BRK_ABRT)            /* Received an ABORT */
 445                 flush_rx_FIFO(scc);
 446
 447         /* HUNT: software DCD; on = waiting for SYNC, off = receiving frame */
 448
 449         if ((changes & SYNC_HUNT) && scc->kiss.softdcd)
 450         {
 451                 if (status & SYNC_HUNT)
 452                 {
 453                         scc->dcd = 0;
 454                         flush_rx_FIFO(scc);
 455                         if ((scc->modem.clocksrc != CLK_EXTERNAL))
 456                                 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
 457                 } else {
 458                         scc->dcd = 1;
 459                 }
 460
 461                 scc_notify(scc, scc->dcd? HWEV_DCD_OFF:HWEV_DCD_ON);
 462         }
 463
 464         /* DCD: on = start to receive packet, off = ABORT condition */
 465         /* (a successfully received packet generates a special condition int) */
 466
 467         if((changes & DCD) && !scc->kiss.softdcd) /* DCD input changed state */
 468         {
 469                 if(status & DCD)                /* DCD is now ON */
 470                 {
 471                         start_hunt(scc);
 472                         scc->dcd = 1;
 473                 } else {                        /* DCD is now OFF */
 474                         cl(scc,R3,ENT_HM|RxENABLE); /* disable the receiver */
 475                         flush_rx_FIFO(scc);
 476                         scc->dcd = 0;
 477                 }
 478
 479                 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
 480         }
 481
 482 #ifdef notdef
 483         /* CTS: use external TxDelay (what's that good for?!)
 484          * Anyway: If we _could_ use it (BayCom USCC uses CTS for
 485          * own purposes) we _should_ use the "autoenable" feature
 486          * of the Z8530 and not this interrupt...
 487          */
 488
 489         if (chg_and_stat & CTS)                 /* CTS is now ON */
 490         {
 491                 if (scc->kiss.txdelay == 0)     /* zero TXDELAY = wait for CTS */
 492                         scc_start_tx_timer(scc, t_txdelay, 0);
 493         }
 494 #endif
 495
 496         if (scc->stat.tx_state == TXS_ACTIVE && (status & TxEOM))
 497         {
 498                 scc->stat.tx_under++;     /* oops, an underrun! count 'em */
 499                 Outb(scc->ctrl, RES_EXT_INT);   /* reset ext/status interrupts */
 500
 501                 if (scc->tx_buff != NULL)
 502                 {
 503                         dev_kfree_skb_irq(scc->tx_buff);
 504                         scc->tx_buff = NULL;
 505                 }
 506
 507                 or(scc,R10,ABUNDER);
 508                 scc_start_tx_timer(scc, t_txdelay, 0);  /* restart transmission */
 509         }
 510
 511         scc->status = status;
 512         Outb(scc->ctrl,RES_EXT_INT);
 513 }
 514
 515
 516 /* Receiver interrupt handler */
 517 static inline void scc_rxint(struct scc_channel *scc)
 518 {
 519         struct sk_buff *skb;
 520
 521         scc->stat.rxints++;
 522
 523         if((scc->wreg[5] & RTS) && scc->kiss.fulldup == KISS_DUPLEX_HALF)
 524         {
 525                 Inb(scc->data);         /* discard char */
 526                 or(scc,R3,ENT_HM);      /* enter hunt mode for next flag */
 527                 return;
 528         }
 529
 530         skb = scc->rx_buff;
 531
 532         if (skb == NULL)
 533         {
 534                 skb = dev_alloc_skb(scc->stat.bufsize);
 535                 if (skb == NULL)
 536                 {
 537                         scc->dev_stat.rx_dropped++;
 538                         scc->stat.nospace++;
 539                         Inb(scc->data);
 540                         or(scc, R3, ENT_HM);
 541                         return;
 542                 }
 543
 544                 scc->rx_buff = skb;
 545                 *(skb_put(skb, 1)) = 0; /* KISS data */
 546         }
 547
 548         if (skb->len >= scc->stat.bufsize)
 549         {
 550 #ifdef notdef
 551                 printk(KERN_DEBUG "z8530drv: oops, scc_rxint() received huge frame...\n");
 552 #endif
 553                 dev_kfree_skb_irq(skb);
 554                 scc->rx_buff = NULL;
 555                 Inb(scc->data);
 556                 or(scc, R3, ENT_HM);
 557                 return;
 558         }
 559
 560         *(skb_put(skb, 1)) = Inb(scc->data);
 561 }
 562
 563
 564 /* Receive Special Condition interrupt handler */
 565 static inline void scc_spint(struct scc_channel *scc)
 566 {
 567         unsigned char status;
 568         struct sk_buff *skb;
 569
 570         scc->stat.spints++;
 571
 572         status = InReg(scc->ctrl,R1);           /* read receiver status */
 573
 574         Inb(scc->data);                         /* throw away Rx byte */
 575         skb = scc->rx_buff;
 576
 577         if(status & Rx_OVR)                     /* receiver overrun */
 578         {
 579                 scc->stat.rx_over++;             /* count them */
 580                 or(scc,R3,ENT_HM);               /* enter hunt mode for next flag */
 581
 582                 if (skb != NULL)
 583                         dev_kfree_skb_irq(skb);
 584                 scc->rx_buff = skb = NULL;
 585         }
 586
 587         if(status & END_FR && skb != NULL)      /* end of frame */
 588         {
 589                 /* CRC okay, frame ends on 8 bit boundary and received something ? */
 590
 591                 if (!(status & CRC_ERR) && (status & 0xe) == RES8 && skb->len > 0)
 592                 {
 593                         /* ignore last received byte (first of the CRC bytes) */
 594                         skb_trim(skb, skb->len-1);
 595                         scc_net_rx(scc, skb);
 596                         scc->rx_buff = NULL;
 597                         scc->stat.rxframes++;
 598                 } else {                                /* a bad frame */
 599                         dev_kfree_skb_irq(skb);
 600                         scc->rx_buff = NULL;
 601                         scc->stat.rxerrs++;
 602                 }
 603         }
 604
 605         Outb(scc->ctrl,ERR_RES);
 606 }
 607
 608
 609 /* ----> interrupt service routine for the Z8530 <---- */
 610
 611 static void scc_isr_dispatch(struct scc_channel *scc, int vector)
 612 {
 613         spin_lock(&scc->lock);
 614         switch (vector & VECTOR_MASK)
 615         {
 616                 case TXINT: scc_txint(scc); break;
 617                 case EXINT: scc_exint(scc); break;
 618                 case RXINT: scc_rxint(scc); break;
 619                 case SPINT: scc_spint(scc); break;
 620         }
 621         spin_unlock(&scc->lock);
 622 }
 623
 624 /* If the card has a latch for the interrupt vector (like the PA0HZP card)
 625    use it to get the number of the chip that generated the int.
 626    If not: poll all defined chips.
 627  */
 628
 629 #define SCC_IRQTIMEOUT 30000
 630
 631 static irqreturn_t scc_isr(int irq, void *dev_id)
 632 {
 633         int chip_irq = (long) dev_id;
 634         unsigned char vector;
 635         struct scc_channel *scc;
 636         struct scc_ctrl *ctrl;
 637         int k;
 638
 639         if (Vector_Latch)
 640         {
 641                 for(k=0; k < SCC_IRQTIMEOUT; k++)
 642                 {
 643                         Outb(Vector_Latch, 0);      /* Generate INTACK */
 644
 645                         /* Read the vector */
 646                         if((vector=Inb(Vector_Latch)) >= 16 * Nchips) break;
 647                         if (vector & 0x01) break;
 648
 649                         scc=&SCC_Info[vector >> 3 ^ 0x01];
 650                         if (!scc->dev) break;
 651
 652                         scc_isr_dispatch(scc, vector);
 653
 654                         OutReg(scc->ctrl,R0,RES_H_IUS);              /* Reset Highest IUS */
 655                 }
 656
 657                 if (k == SCC_IRQTIMEOUT)
 658                         printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?\n");
 659
 660                 return IRQ_HANDLED;
 661         }
 662
 663         /* Find the SCC generating the interrupt by polling all attached SCCs
 664          * reading RR3A (the interrupt pending register)
 665          */
 666
 667         ctrl = SCC_ctrl;
 668         while (ctrl->chan_A)
 669         {
 670                 if (ctrl->irq != chip_irq)
 671                 {
 672                         ctrl++;
 673                         continue;
 674                 }
 675
 676                 scc = NULL;
 677                 for (k = 0; InReg(ctrl->chan_A,R3) && k < SCC_IRQTIMEOUT; k++)
 678                 {
 679                         vector=InReg(ctrl->chan_B,R2);  /* Read the vector */
 680                         if (vector & 0x01) break;
 681
 682                         scc = &SCC_Info[vector >> 3 ^ 0x01];
 683                         if (!scc->dev) break;
 684
 685                         scc_isr_dispatch(scc, vector);
 686                 }
 687
 688                 if (k == SCC_IRQTIMEOUT)
 689                 {
 690                         printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?!\n");
 691                         break;
 692                 }
 693
 694                 /* This looks weird and it is. At least the BayCom USCC doesn't
 695                  * use the Interrupt Daisy Chain, thus we'll have to start
 696                  * all over again to be sure not to miss an interrupt from
 697                  * (any of) the other chip(s)...
 698                  * Honestly, the situation *is* braindamaged...
 699                  */
 700
 701                 if (scc != NULL)
 702                 {
 703                         OutReg(scc->ctrl,R0,RES_H_IUS);
 704                         ctrl = SCC_ctrl;
 705                 } else
 706                         ctrl++;
 707         }
 708         return IRQ_HANDLED;
 709 }
 710
 711
 712
 713 /* ******************************************************************** */
 714 /* *                    Init Channel                                    */
 715 /* ******************************************************************** */
 716
 717
 718 /* ----> set SCC channel speed <---- */
 719
 720 static inline void set_brg(struct scc_channel *scc, unsigned int tc)
 721 {
 722         cl(scc,R14,BRENABL);            /* disable baudrate generator */
 723         wr(scc,R12,tc & 255);           /* brg rate LOW */
 724         wr(scc,R13,tc >> 8);            /* brg rate HIGH */
 725         or(scc,R14,BRENABL);            /* enable baudrate generator */
 726 }
 727
 728 static inline void set_speed(struct scc_channel *scc)
 729 {
 730         unsigned long flags;
 731         spin_lock_irqsave(&scc->lock, flags);
 732
 733         if (scc->modem.speed > 0)       /* paranoia... */
 734                 set_brg(scc, (unsigned) (scc->clock / (scc->modem.speed * 64)) - 2);
 735
 736         spin_unlock_irqrestore(&scc->lock, flags);
 737 }
 738
 739
 740 /* ----> initialize a SCC channel <---- */
 741
 742 static inline void init_brg(struct scc_channel *scc)
 743 {
 744         wr(scc, R14, BRSRC);                            /* BRG source = PCLK */
 745         OutReg(scc->ctrl, R14, SSBR|scc->wreg[R14]);    /* DPLL source = BRG */
 746         OutReg(scc->ctrl, R14, SNRZI|scc->wreg[R14]);   /* DPLL NRZI mode */
 747 }
 748
 749 /*
 750  * Initialization according to the Z8530 manual (SGS-Thomson's version):
 751  *
 752  * 1. Modes and constants
 753  *
 754  * WR9  11000000        chip reset
 755  * WR4  XXXXXXXX        Tx/Rx control, async or sync mode
 756  * WR1  0XX00X00        select W/REQ (optional)
 757  * WR2  XXXXXXXX        program interrupt vector
 758  * WR3  XXXXXXX0        select Rx control
 759  * WR5  XXXX0XXX        select Tx control
 760  * WR6  XXXXXXXX        sync character
 761  * WR7  XXXXXXXX        sync character
 762  * WR9  000X0XXX        select interrupt control
 763  * WR10 XXXXXXXX        miscellaneous control (optional)
 764  * WR11 XXXXXXXX        clock control
 765  * WR12 XXXXXXXX        time constant lower byte (optional)
 766  * WR13 XXXXXXXX        time constant upper byte (optional)
 767  * WR14 XXXXXXX0        miscellaneous control
 768  * WR14 XXXSSSSS        commands (optional)
 769  *
 770  * 2. Enables
 771  *
 772  * WR14 000SSSS1        baud rate enable
 773  * WR3  SSSSSSS1        Rx enable
 774  * WR5  SSSS1SSS        Tx enable
 775  * WR0  10000000        reset Tx CRG (optional)
 776  * WR1  XSS00S00        DMA enable (optional)
 777  *
 778  * 3. Interrupt status
 779  *
 780  * WR15 XXXXXXXX        enable external/status
 781  * WR0  00010000        reset external status
 782  * WR0  00010000        reset external status twice
 783  * WR1  SSSXXSXX        enable Rx, Tx and Ext/status
 784  * WR9  000SXSSS        enable master interrupt enable
 785  *
 786  * 1 = set to one, 0 = reset to zero
 787  * X = user defined, S = same as previous init
 788  *
 789  *
 790  * Note that the implementation differs in some points from above scheme.
 791  *
 792  */
 793
 794 static void init_channel(struct scc_channel *scc)
 795 {
 796         del_timer(&scc->tx_t);
 797         del_timer(&scc->tx_wdog);
 798
 799         disable_irq(scc->irq);
 800
 801         wr(scc,R4,X1CLK|SDLC);          /* *1 clock, SDLC mode */
 802         wr(scc,R1,0);                   /* no W/REQ operation */
 803         wr(scc,R3,Rx8|RxCRC_ENAB);      /* RX 8 bits/char, CRC, disabled */
 804         wr(scc,R5,Tx8|DTR|TxCRC_ENAB);  /* TX 8 bits/char, disabled, DTR */
 805         wr(scc,R6,0);                   /* SDLC address zero (not used) */
 806         wr(scc,R7,FLAG);                /* SDLC flag value */
 807         wr(scc,R9,VIS);                 /* vector includes status */
 808         wr(scc,R10,(scc->modem.nrz? NRZ : NRZI)|CRCPS|ABUNDER); /* abort on underrun, preset CRC generator, NRZ(I) */
 809         wr(scc,R14, 0);
 810
 811
 812 /* set clock sources:
 813
 814    CLK_DPLL: normal halfduplex operation
 815
 816                 RxClk: use DPLL
 817                 TxClk: use DPLL
 818                 TRxC mode DPLL output
 819
 820    CLK_EXTERNAL: external clocking (G3RUH or DF9IC modem)
 821
 822                 BayCom:                 others:
 823
 824                 TxClk = pin RTxC        TxClk = pin TRxC
 825                 RxClk = pin TRxC        RxClk = pin RTxC
 826
 827
 828    CLK_DIVIDER:
 829                 RxClk = use DPLL
 830                 TxClk = pin RTxC
 831
 832                 BayCom:                 others:
 833                 pin TRxC = DPLL         pin TRxC = BRG
 834                 (RxClk * 1)             (RxClk * 32)
 835 */
 836
 837
 838         switch(scc->modem.clocksrc)
 839         {
 840                 case CLK_DPLL:
 841                         wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
 842                         init_brg(scc);
 843                         break;
 844
 845                 case CLK_DIVIDER:
 846                         wr(scc, R11, ((scc->brand & BAYCOM)? TRxCDP : TRxCBR) | RCDPLL|TCRTxCP|TRxCOI);
 847                         init_brg(scc);
 848                         break;
 849
 850                 case CLK_EXTERNAL:
 851                         wr(scc, R11, (scc->brand & BAYCOM)? RCTRxCP|TCRTxCP : RCRTxCP|TCTRxCP);
 852                         OutReg(scc->ctrl, R14, DISDPLL);
 853                         break;
 854
 855         }
 856
 857         set_speed(scc);                 /* set baudrate */
 858
 859         if(scc->enhanced)
 860         {
 861                 or(scc,R15,SHDLCE|FIFOE);       /* enable FIFO, SDLC/HDLC Enhancements (From now R7 is R7') */
 862                 wr(scc,R7,AUTOEOM);
 863         }
 864
 865         if(scc->kiss.softdcd || (InReg(scc->ctrl,R0) & DCD))
 866                                                 /* DCD is now ON */
 867         {
 868                 start_hunt(scc);
 869         }
 870
 871         /* enable ABORT, DCD & SYNC/HUNT interrupts */
 872
 873         wr(scc,R15, BRKIE|TxUIE|(scc->kiss.softdcd? SYNCIE:DCDIE));
 874
 875         Outb(scc->ctrl,RES_EXT_INT);    /* reset ext/status interrupts */
 876         Outb(scc->ctrl,RES_EXT_INT);    /* must be done twice */
 877
 878         or(scc,R1,INT_ALL_Rx|TxINT_ENAB|EXT_INT_ENAB); /* enable interrupts */
 879
 880         scc->status = InReg(scc->ctrl,R0);      /* read initial status */
 881
 882         or(scc,R9,MIE);                 /* master interrupt enable */
 883
 884         scc_init_timer(scc);
 885
 886         enable_irq(scc->irq);
 887 }
 888
 889
 890
 891
 892 /* ******************************************************************** */
 893 /* *                    SCC timer functions                           * */
 894 /* ******************************************************************** */
 895
 896
 897 /* ----> scc_key_trx sets the time constant for the baudrate
 898          generator and keys the transmitter                  <---- */
 899
 900 static void scc_key_trx(struct scc_channel *scc, char tx)
 901 {
 902         unsigned int time_const;
 903
 904         if (scc->brand & PRIMUS)
 905                 Outb(scc->ctrl + 4, scc->option | (tx? 0x80 : 0));
 906
 907         if (scc->modem.speed < 300)
 908                 scc->modem.speed = 1200;
 909
 910         time_const = (unsigned) (scc->clock / (scc->modem.speed * (tx? 2:64))) - 2;
 911
 912         disable_irq(scc->irq);
 913
 914         if (tx)
 915         {
 916                 or(scc, R1, TxINT_ENAB);        /* t_maxkeyup may have reset these */
 917                 or(scc, R15, TxUIE);
 918         }
 919
 920         if (scc->modem.clocksrc == CLK_DPLL)
 921         {                               /* force simplex operation */
 922                 if (tx)
 923                 {
 924 #ifdef CONFIG_SCC_TRXECHO
 925                         cl(scc, R3, RxENABLE|ENT_HM);   /* switch off receiver */
 926                         cl(scc, R15, DCDIE|SYNCIE);     /* No DCD changes, please */
 927 #endif
 928                         set_brg(scc, time_const);       /* reprogram baudrate generator */
 929
 930                         /* DPLL -> Rx clk, BRG -> Tx CLK, TRxC mode output, TRxC = BRG */
 931                         wr(scc, R11, RCDPLL|TCBR|TRxCOI|TRxCBR);
 932
 933                         /* By popular demand: tx_inhibit */
 934                         if (scc->kiss.tx_inhibit)
 935                         {
 936                                 or(scc,R5, TxENAB);
 937                                 scc->wreg[R5] |= RTS;
 938                         } else {
 939                                 or(scc,R5,RTS|TxENAB);  /* set the RTS line and enable TX */
 940                         }
 941                 } else {
 942                         cl(scc,R5,RTS|TxENAB);
 943
 944                         set_brg(scc, time_const);       /* reprogram baudrate generator */
 945
 946                         /* DPLL -> Rx clk, DPLL -> Tx CLK, TRxC mode output, TRxC = DPLL */
 947                         wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
 948
 949 #ifndef CONFIG_SCC_TRXECHO
 950                         if (scc->kiss.softdcd)
 951 #endif
 952                         {
 953                                 or(scc,R15, scc->kiss.softdcd? SYNCIE:DCDIE);
 954                                 start_hunt(scc);
 955                         }
 956                 }
 957         } else {
 958                 if (tx)
 959                 {
 960 #ifdef CONFIG_SCC_TRXECHO
 961                         if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
 962                         {
 963                                 cl(scc, R3, RxENABLE);
 964                                 cl(scc, R15, DCDIE|SYNCIE);
 965                         }
 966 #endif
 967
 968                         if (scc->kiss.tx_inhibit)
 969                         {
 970                                 or(scc,R5, TxENAB);
 971                                 scc->wreg[R5] |= RTS;
 972                         } else {
 973                                 or(scc,R5,RTS|TxENAB);  /* enable tx */
 974                         }
 975                 } else {
 976                         cl(scc,R5,RTS|TxENAB);          /* disable tx */
 977
 978                         if ((scc->kiss.fulldup == KISS_DUPLEX_HALF) &&
 979 #ifndef CONFIG_SCC_TRXECHO
 980                             scc->kiss.softdcd)
 981 #else
 982                             1)
 983 #endif
 984                         {
 985                                 or(scc, R15, scc->kiss.softdcd? SYNCIE:DCDIE);
 986                                 start_hunt(scc);
 987                         }
 988                 }
 989         }
 990
 991         enable_irq(scc->irq);
 992 }
 993
 994
 995 /* ----> SCC timer interrupt handler and friends. <---- */
 996
 997 static void __scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
 998 {
 999         del_timer(&scc->tx_t);
1000
1001         if (when == 0)
1002         {
1003                 handler((unsigned long) scc);
1004         } else
1005         if (when != TIMER_OFF)
1006         {
1007                 scc->tx_t.data = (unsigned long) scc;
1008                 scc->tx_t.function = handler;
1009                 scc->tx_t.expires = jiffies + (when*HZ)/100;
1010                 add_timer(&scc->tx_t);
1011         }
1012 }
1013
1014 static void scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
1015 {
1016         unsigned long flags;
1017
1018         spin_lock_irqsave(&scc->lock, flags);
1019         __scc_start_tx_timer(scc, handler, when);
1020         spin_unlock_irqrestore(&scc->lock, flags);
1021 }
1022
1023 static void scc_start_defer(struct scc_channel *scc)
1024 {
1025         unsigned long flags;
1026
1027         spin_lock_irqsave(&scc->lock, flags);
1028         del_timer(&scc->tx_wdog);
1029
1030         if (scc->kiss.maxdefer != 0 && scc->kiss.maxdefer != TIMER_OFF)
1031         {
1032                 scc->tx_wdog.data = (unsigned long) scc;
1033                 scc->tx_wdog.function = t_busy;
1034                 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxdefer;
1035                 add_timer(&scc->tx_wdog);
1036         }
1037         spin_unlock_irqrestore(&scc->lock, flags);
1038 }
1039
1040 static void scc_start_maxkeyup(struct scc_channel *scc)
1041 {
1042         unsigned long flags;
1043
1044         spin_lock_irqsave(&scc->lock, flags);
1045         del_timer(&scc->tx_wdog);
1046
1047         if (scc->kiss.maxkeyup != 0 && scc->kiss.maxkeyup != TIMER_OFF)
1048         {
1049                 scc->tx_wdog.data = (unsigned long) scc;
1050                 scc->tx_wdog.function = t_maxkeyup;
1051                 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxkeyup;
1052                 add_timer(&scc->tx_wdog);
1053         }
1054         spin_unlock_irqrestore(&scc->lock, flags);
1055 }
1056
1057 /*
1058  * This is called from scc_txint() when there are no more frames to send.
1059  * Not exactly a timer function, but it is a close friend of the family...
1060  */
1061
1062 static void scc_tx_done(struct scc_channel *scc)
1063 {
1064         /*
1065          * trx remains keyed in fulldup mode 2 until t_idle expires.
1066          */
1067
1068         switch (scc->kiss.fulldup)
1069         {
1070                 case KISS_DUPLEX_LINK:
1071                         scc->stat.tx_state = TXS_IDLE2;
1072                         if (scc->kiss.idletime != TIMER_OFF)
1073                         scc_start_tx_timer(scc, t_idle, scc->kiss.idletime*100);
1074                         break;
1075                 case KISS_DUPLEX_OPTIMA:
1076                         scc_notify(scc, HWEV_ALL_SENT);
1077                         break;
1078                 default:
1079                         scc->stat.tx_state = TXS_BUSY;
1080                         scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1081         }
1082
1083         netif_wake_queue(scc->dev);
1084 }
1085
1086
1087 static unsigned char Rand = 17;
1088
1089 static inline int is_grouped(struct scc_channel *scc)
1090 {
1091         int k;
1092         struct scc_channel *scc2;
1093         unsigned char grp1, grp2;
1094
1095         grp1 = scc->kiss.group;
1096
1097         for (k = 0; k < (Nchips * 2); k++)
1098         {
1099                 scc2 = &SCC_Info[k];
1100                 grp2 = scc2->kiss.group;
1101
1102                 if (scc2 == scc || !(scc2->dev && grp2))
1103                         continue;
1104
1105                 if ((grp1 & 0x3f) == (grp2 & 0x3f))
1106                 {
1107                         if ( (grp1 & TXGROUP) && (scc2->wreg[R5] & RTS) )
1108                                 return 1;
1109
1110                         if ( (grp1 & RXGROUP) && scc2->dcd )
1111                                 return 1;
1112                 }
1113         }
1114         return 0;
1115 }
1116
1117 /* DWAIT and SLOTTIME expired
1118  *
1119  * fulldup == 0:  DCD is active or Rand > P-persistence: start t_busy timer
1120  *                else key trx and start txdelay
1121  * fulldup == 1:  key trx and start txdelay
1122  * fulldup == 2:  mintime expired, reset status or key trx and start txdelay
1123  */
1124
1125 static void t_dwait(unsigned long channel)
1126 {
1127         struct scc_channel *scc = (struct scc_channel *) channel;
1128
1129         if (scc->stat.tx_state == TXS_WAIT)     /* maxkeyup or idle timeout */
1130         {
1131                 if (skb_queue_empty(&scc->tx_queue)) {  /* nothing to send */
1132                         scc->stat.tx_state = TXS_IDLE;
1133                         netif_wake_queue(scc->dev);     /* t_maxkeyup locked it. */
1134                         return;
1135                 }
1136
1137                 scc->stat.tx_state = TXS_BUSY;
1138         }
1139
1140         if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1141         {
1142                 Rand = Rand * 17 + 31;
1143
1144                 if (scc->dcd || (scc->kiss.persist) < Rand || (scc->kiss.group && is_grouped(scc)) )
1145                 {
1146                         scc_start_defer(scc);
1147                         scc_start_tx_timer(scc, t_dwait, scc->kiss.slottime);
1148                         return ;
1149                 }
1150         }
1151
1152         if ( !(scc->wreg[R5] & RTS) )
1153         {
1154                 scc_key_trx(scc, TX_ON);
1155                 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1156         } else {
1157                 scc_start_tx_timer(scc, t_txdelay, 0);
1158         }
1159 }
1160
1161
1162 /* TXDELAY expired
1163  *
1164  * kick transmission by a fake scc_txint(scc), start 'maxkeyup' watchdog.
1165  */
1166
1167 static void t_txdelay(unsigned long channel)
1168 {
1169         struct scc_channel *scc = (struct scc_channel *) channel;
1170
1171         scc_start_maxkeyup(scc);
1172
1173         if (scc->tx_buff == NULL)
1174         {
1175                 disable_irq(scc->irq);
1176                 scc_txint(scc);
1177                 enable_irq(scc->irq);
1178         }
1179 }
1180
1181
1182 /* TAILTIME expired
1183  *
1184  * switch off transmitter. If we were stopped by Maxkeyup restart
1185  * transmission after 'mintime' seconds
1186  */
1187
1188 static void t_tail(unsigned long channel)
1189 {
1190         struct scc_channel *scc = (struct scc_channel *) channel;
1191         unsigned long flags;
1192
1193         spin_lock_irqsave(&scc->lock, flags);
1194         del_timer(&scc->tx_wdog);
1195         scc_key_trx(scc, TX_OFF);
1196         spin_unlock_irqrestore(&scc->lock, flags);
1197
1198         if (scc->stat.tx_state == TXS_TIMEOUT)          /* we had a timeout? */
1199         {
1200                 scc->stat.tx_state = TXS_WAIT;
1201                 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1202                 return;
1203         }
1204
1205         scc->stat.tx_state = TXS_IDLE;
1206         netif_wake_queue(scc->dev);
1207 }
1208
1209
1210 /* BUSY timeout
1211  *
1212  * throw away send buffers if DCD remains active too long.
1213  */
1214
1215 static void t_busy(unsigned long channel)
1216 {
1217         struct scc_channel *scc = (struct scc_channel *) channel;
1218
1219         del_timer(&scc->tx_t);
1220         netif_stop_queue(scc->dev);     /* don't pile on the wabbit! */
1221
1222         scc_discard_buffers(scc);
1223         scc->stat.txerrs++;
1224         scc->stat.tx_state = TXS_IDLE;
1225
1226         netif_wake_queue(scc->dev);
1227 }
1228
1229 /* MAXKEYUP timeout
1230  *
1231  * this is our watchdog.
1232  */
1233
1234 static void t_maxkeyup(unsigned long channel)
1235 {
1236         struct scc_channel *scc = (struct scc_channel *) channel;
1237         unsigned long flags;
1238
1239         spin_lock_irqsave(&scc->lock, flags);
1240         /*
1241          * let things settle down before we start to
1242          * accept new data.
1243          */
1244
1245         netif_stop_queue(scc->dev);
1246         scc_discard_buffers(scc);
1247
1248         del_timer(&scc->tx_t);
1249
1250         cl(scc, R1, TxINT_ENAB);        /* force an ABORT, but don't */
1251         cl(scc, R15, TxUIE);            /* count it. */
1252         OutReg(scc->ctrl, R0, RES_Tx_P);
1253
1254         spin_unlock_irqrestore(&scc->lock, flags);
1255
1256         scc->stat.txerrs++;
1257         scc->stat.tx_state = TXS_TIMEOUT;
1258         scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1259 }
1260
1261 /* IDLE timeout
1262  *
1263  * in fulldup mode 2 it keys down the transmitter after 'idle' seconds
1264  * of inactivity. We will not restart transmission before 'mintime'
1265  * expires.
1266  */
1267
1268 static void t_idle(unsigned long channel)
1269 {
1270         struct scc_channel *scc = (struct scc_channel *) channel;
1271
1272         del_timer(&scc->tx_wdog);
1273
1274         scc_key_trx(scc, TX_OFF);
1275         if(scc->kiss.mintime)
1276                 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1277         scc->stat.tx_state = TXS_WAIT;
1278 }
1279
1280 static void scc_init_timer(struct scc_channel *scc)
1281 {
1282         unsigned long flags;
1283
1284         spin_lock_irqsave(&scc->lock, flags);
1285         scc->stat.tx_state = TXS_IDLE;
1286         spin_unlock_irqrestore(&scc->lock, flags);
1287 }
1288
1289
1290 /* ******************************************************************** */
1291 /* *                    Set/get L1 parameters                         * */
1292 /* ******************************************************************** */
1293
1294
1295 /*
1296  * this will set the "hardware" parameters through KISS commands or ioctl()
1297  */
1298
1299 #define CAST(x) (unsigned long)(x)
1300
1301 static unsigned int scc_set_param(struct scc_channel *scc, unsigned int cmd, unsigned int arg)
1302 {
1303         switch (cmd)
1304         {
1305                 case PARAM_TXDELAY:     scc->kiss.txdelay=arg;          break;
1306                 case PARAM_PERSIST:     scc->kiss.persist=arg;          break;
1307                 case PARAM_SLOTTIME:    scc->kiss.slottime=arg;         break;
1308                 case PARAM_TXTAIL:      scc->kiss.tailtime=arg;         break;
1309                 case PARAM_FULLDUP:     scc->kiss.fulldup=arg;          break;
1310                 case PARAM_DTR:         break; /* does someone need this? */
1311                 case PARAM_GROUP:       scc->kiss.group=arg;            break;
1312                 case PARAM_IDLE:        scc->kiss.idletime=arg;         break;
1313                 case PARAM_MIN:         scc->kiss.mintime=arg;          break;
1314                 case PARAM_MAXKEY:      scc->kiss.maxkeyup=arg;         break;
1315                 case PARAM_WAIT:        scc->kiss.waittime=arg;         break;
1316                 case PARAM_MAXDEFER:    scc->kiss.maxdefer=arg;         break;
1317                 case PARAM_TX:          scc->kiss.tx_inhibit=arg;       break;
1318
1319                 case PARAM_SOFTDCD:
1320                         scc->kiss.softdcd=arg;
1321                         if (arg)
1322                         {
1323                                 or(scc, R15, SYNCIE);
1324                                 cl(scc, R15, DCDIE);
1325                                 start_hunt(scc);
1326                         } else {
1327                                 or(scc, R15, DCDIE);
1328                                 cl(scc, R15, SYNCIE);
1329                         }
1330                         break;
1331
1332                 case PARAM_SPEED:
1333                         if (arg < 256)
1334                                 scc->modem.speed=arg*100;
1335                         else
1336                                 scc->modem.speed=arg;
1337
1338                         if (scc->stat.tx_state == 0)    /* only switch baudrate on rx... ;-) */
1339                                 set_speed(scc);
1340                         break;
1341
1342                 case PARAM_RTS:
1343                         if ( !(scc->wreg[R5] & RTS) )
1344                         {
1345                                 if (arg != TX_OFF) {
1346                                         scc_key_trx(scc, TX_ON);
1347                                         scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1348                                 }
1349                         } else {
1350                                 if (arg == TX_OFF)
1351                                 {
1352                                         scc->stat.tx_state = TXS_BUSY;
1353                                         scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1354                                 }
1355                         }
1356                         break;
1357
1358                 case PARAM_HWEVENT:
1359                         scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
1360                         break;
1361
1362                 default:                return -EINVAL;
1363         }
1364
1365         return 0;
1366 }
1367
1368
1369
1370 static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd)
1371 {
1372         switch (cmd)
1373         {
1374                 case PARAM_TXDELAY:     return CAST(scc->kiss.txdelay);
1375                 case PARAM_PERSIST:     return CAST(scc->kiss.persist);
1376                 case PARAM_SLOTTIME:    return CAST(scc->kiss.slottime);
1377                 case PARAM_TXTAIL:      return CAST(scc->kiss.tailtime);
1378                 case PARAM_FULLDUP:     return CAST(scc->kiss.fulldup);
1379                 case PARAM_SOFTDCD:     return CAST(scc->kiss.softdcd);
1380                 case PARAM_DTR:         return CAST((scc->wreg[R5] & DTR)? 1:0);
1381                 case PARAM_RTS:         return CAST((scc->wreg[R5] & RTS)? 1:0);
1382                 case PARAM_SPEED:       return CAST(scc->modem.speed);
1383                 case PARAM_GROUP:       return CAST(scc->kiss.group);
1384                 case PARAM_IDLE:        return CAST(scc->kiss.idletime);
1385                 case PARAM_MIN:         return CAST(scc->kiss.mintime);
1386                 case PARAM_MAXKEY:      return CAST(scc->kiss.maxkeyup);
1387                 case PARAM_WAIT:        return CAST(scc->kiss.waittime);
1388                 case PARAM_MAXDEFER:    return CAST(scc->kiss.maxdefer);
1389                 case PARAM_TX:          return CAST(scc->kiss.tx_inhibit);
1390                 default:                return NO_SUCH_PARAM;
1391         }
1392
1393 }
1394
1395 #undef CAST
1396
1397 /* ******************************************************************* */
1398 /* *                    Send calibration pattern                     * */
1399 /* ******************************************************************* */
1400
1401 static void scc_stop_calibrate(unsigned long channel)
1402 {
1403         struct scc_channel *scc = (struct scc_channel *) channel;
1404         unsigned long flags;
1405
1406         spin_lock_irqsave(&scc->lock, flags);
1407         del_timer(&scc->tx_wdog);
1408         scc_key_trx(scc, TX_OFF);
1409         wr(scc, R6, 0);
1410         wr(scc, R7, FLAG);
1411         Outb(scc->ctrl,RES_EXT_INT);    /* reset ext/status interrupts */
1412         Outb(scc->ctrl,RES_EXT_INT);
1413
1414         netif_wake_queue(scc->dev);
1415         spin_unlock_irqrestore(&scc->lock, flags);
1416 }
1417
1418
1419 static void
1420 scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern)
1421 {
1422         unsigned long flags;
1423
1424         spin_lock_irqsave(&scc->lock, flags);
1425         netif_stop_queue(scc->dev);
1426         scc_discard_buffers(scc);
1427
1428         del_timer(&scc->tx_wdog);
1429
1430         scc->tx_wdog.data = (unsigned long) scc;
1431         scc->tx_wdog.function = scc_stop_calibrate;
1432         scc->tx_wdog.expires = jiffies + HZ*duration;
1433         add_timer(&scc->tx_wdog);
1434
1435         /* This doesn't seem to work. Why not? */
1436         wr(scc, R6, 0);
1437         wr(scc, R7, pattern);
1438
1439         /*
1440          * Don't know if this works.
1441          * Damn, where is my Z8530 programming manual...?
1442          */
1443
1444         Outb(scc->ctrl,RES_EXT_INT);    /* reset ext/status interrupts */
1445         Outb(scc->ctrl,RES_EXT_INT);
1446
1447         scc_key_trx(scc, TX_ON);
1448         spin_unlock_irqrestore(&scc->lock, flags);
1449 }
1450
1451 /* ******************************************************************* */
1452 /* *            Init channel structures, special HW, etc...          * */
1453 /* ******************************************************************* */
1454
1455 /*
1456  * Reset the Z8530s and setup special hardware
1457  */
1458
1459 static void z8530_init(void)
1460 {
1461         struct scc_channel *scc;
1462         int chip, k;
1463         unsigned long flags;
1464         char *flag;
1465
1466
1467         printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2);
1468
1469         flag=" ";
1470         for (k = 0; k < nr_irqs; k++)
1471                 if (Ivec[k].used)
1472                 {
1473                         printk("%s%d", flag, k);
1474                         flag=",";
1475                 }
1476         printk("\n");
1477
1478
1479         /* reset and pre-init all chips in the system */
1480         for (chip = 0; chip < Nchips; chip++)
1481         {
1482                 scc=&SCC_Info[2*chip];
1483                 if (!scc->ctrl) continue;
1484
1485                 /* Special SCC cards */
1486
1487                 if(scc->brand & EAGLE)                  /* this is an EAGLE card */
1488                         Outb(scc->special,0x08);        /* enable interrupt on the board */
1489
1490                 if(scc->brand & (PC100 | PRIMUS))       /* this is a PC100/PRIMUS card */
1491                         Outb(scc->special,scc->option); /* set the MODEM mode (0x22) */
1492
1493
1494                 /* Reset and pre-init Z8530 */
1495
1496                 spin_lock_irqsave(&scc->lock, flags);
1497
1498                 Outb(scc->ctrl, 0);
1499                 OutReg(scc->ctrl,R9,FHWRES);            /* force hardware reset */
1500                 udelay(100);                            /* give it 'a bit' more time than required */
1501                 wr(scc, R2, chip*16);                   /* interrupt vector */
1502                 wr(scc, R9, VIS);                       /* vector includes status */
1503                 spin_unlock_irqrestore(&scc->lock, flags);
1504         }
1505
1506
1507         Driver_Initialized = 1;
1508 }
1509
1510 /*
1511  * Allocate device structure, err, instance, and register driver
1512  */
1513
1514 static int scc_net_alloc(const char *name, struct scc_channel *scc)
1515 {
1516         int err;
1517         struct net_device *dev;
1518
1519         dev = alloc_netdev(0, name, scc_net_setup);
1520         if (!dev)
1521                 return -ENOMEM;
1522
1523         dev->ml_priv = scc;
1524         scc->dev = dev;
1525         spin_lock_init(&scc->lock);
1526         init_timer(&scc->tx_t);
1527         init_timer(&scc->tx_wdog);
1528
1529         err = register_netdevice(dev);
1530         if (err) {
1531                 printk(KERN_ERR "%s: can't register network device (%d)\n",
1532                        name, err);
1533                 free_netdev(dev);
1534                 scc->dev = NULL;
1535                 return err;
1536         }
1537
1538         return 0;
1539 }
1540
1541
1542
1543 /* ******************************************************************** */
1544 /* *                        Network driver methods                    * */
1545 /* ******************************************************************** */
1546
1547 static const struct net_device_ops scc_netdev_ops = {
1548         .ndo_open            = scc_net_open,
1549         .ndo_stop            = scc_net_close,
1550         .ndo_start_xmit      = scc_net_tx,
1551         .ndo_set_mac_address = scc_net_set_mac_address,
1552         .ndo_get_stats       = scc_net_get_stats,
1553         .ndo_do_ioctl        = scc_net_ioctl,
1554 };
1555
1556 /* ----> Initialize device <----- */
1557
1558 static void scc_net_setup(struct net_device *dev)
1559 {
1560         dev->tx_queue_len    = 16;      /* should be enough... */
1561
1562         dev->netdev_ops      = &scc_netdev_ops;
1563         dev->header_ops      = &ax25_header_ops;
1564
1565         memcpy(dev->broadcast, &ax25_bcast,  AX25_ADDR_LEN);
1566         memcpy(dev->dev_addr,  &ax25_defaddr, AX25_ADDR_LEN);
1567
1568         dev->flags      = 0;
1569
1570         dev->type = ARPHRD_AX25;
1571         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1572         dev->mtu = AX25_DEF_PACLEN;
1573         dev->addr_len = AX25_ADDR_LEN;
1574
1575 }
1576
1577 /* ----> open network device <---- */
1578
1579 static int scc_net_open(struct net_device *dev)
1580 {
1581         struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1582
1583         if (!scc->init)
1584                 return -EINVAL;
1585
1586         scc->tx_buff = NULL;
1587         skb_queue_head_init(&scc->tx_queue);
1588
1589         init_channel(scc);
1590
1591         netif_start_queue(dev);
1592         return 0;
1593 }
1594
1595 /* ----> close network device <---- */
1596
1597 static int scc_net_close(struct net_device *dev)
1598 {
1599         struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1600         unsigned long flags;
1601
1602         netif_stop_queue(dev);
1603
1604         spin_lock_irqsave(&scc->lock, flags);
1605         Outb(scc->ctrl,0);              /* Make sure pointer is written */
1606         wr(scc,R1,0);                   /* disable interrupts */
1607         wr(scc,R3,0);
1608         spin_unlock_irqrestore(&scc->lock, flags);
1609
1610         del_timer_sync(&scc->tx_t);
1611         del_timer_sync(&scc->tx_wdog);
1612
1613         scc_discard_buffers(scc);
1614
1615         return 0;
1616 }
1617
1618 /* ----> receive frame, called from scc_rxint() <---- */
1619
1620 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
1621 {
1622         if (skb->len == 0) {
1623                 dev_kfree_skb_irq(skb);
1624                 return;
1625         }
1626
1627         scc->dev_stat.rx_packets++;
1628         scc->dev_stat.rx_bytes += skb->len;
1629
1630         skb->protocol = ax25_type_trans(skb, scc->dev);
1631
1632         netif_rx(skb);
1633         return;
1634 }
1635
1636 /* ----> transmit frame <---- */
1637
1638 static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev)
1639 {
1640         struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1641         unsigned long flags;
1642         char kisscmd;
1643
1644         if (skb->len > scc->stat.bufsize || skb->len < 2) {
1645                 scc->dev_stat.tx_dropped++;     /* bogus frame */
1646                 dev_kfree_skb(skb);
1647                 return NETDEV_TX_OK;
1648         }
1649
1650         scc->dev_stat.tx_packets++;
1651         scc->dev_stat.tx_bytes += skb->len;
1652         scc->stat.txframes++;
1653
1654         kisscmd = *skb->data & 0x1f;
1655         skb_pull(skb, 1);
1656
1657         if (kisscmd) {
1658                 scc_set_param(scc, kisscmd, *skb->data);
1659                 dev_kfree_skb(skb);
1660                 return NETDEV_TX_OK;
1661         }
1662
1663         spin_lock_irqsave(&scc->lock, flags);
1664
1665         if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
1666                 struct sk_buff *skb_del;
1667                 skb_del = skb_dequeue(&scc->tx_queue);
1668                 dev_kfree_skb(skb_del);
1669         }
1670         skb_queue_tail(&scc->tx_queue, skb);
1671         dev->trans_start = jiffies;
1672
1673
1674         /*
1675          * Start transmission if the trx state is idle or
1676          * t_idle hasn't expired yet. Use dwait/persistence/slottime
1677          * algorithm for normal halfduplex operation.
1678          */
1679
1680         if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) {
1681                 scc->stat.tx_state = TXS_BUSY;
1682                 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1683                         __scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime);
1684                 else
1685                         __scc_start_tx_timer(scc, t_dwait, 0);
1686         }
1687         spin_unlock_irqrestore(&scc->lock, flags);
1688         return NETDEV_TX_OK;
1689 }
1690
1691 /* ----> ioctl functions <---- */
1692
1693 /*
1694  * SIOCSCCCFG           - configure driver      arg: (struct scc_hw_config *) arg
1695  * SIOCSCCINI           - initialize driver     arg: ---
1696  * SIOCSCCCHANINI       - initialize channel    arg: (struct scc_modem *) arg
1697  * SIOCSCCSMEM          - set memory            arg: (struct scc_mem_config *) arg
1698  * SIOCSCCGKISS         - get level 1 parameter arg: (struct scc_kiss_cmd *) arg
1699  * SIOCSCCSKISS         - set level 1 parameter arg: (struct scc_kiss_cmd *) arg
1700  * SIOCSCCGSTAT         - get driver status     arg: (struct scc_stat *) arg
1701  * SIOCSCCCAL           - send calib. pattern   arg: (struct scc_calibrate *) arg
1702  */
1703
1704 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1705 {
1706         struct scc_kiss_cmd kiss_cmd;
1707         struct scc_mem_config memcfg;
1708         struct scc_hw_config hwcfg;
1709         struct scc_calibrate cal;
1710         struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1711         int chan;
1712         unsigned char device_name[IFNAMSIZ];
1713         void __user *arg = ifr->ifr_data;
1714
1715
1716         if (!Driver_Initialized)
1717         {
1718                 if (cmd == SIOCSCCCFG)
1719                 {
1720                         int found = 1;
1721
1722                         if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1723                         if (!arg) return -EFAULT;
1724
1725                         if (Nchips >= SCC_MAXCHIPS)
1726                                 return -EINVAL;
1727
1728                         if (copy_from_user(&hwcfg, arg, sizeof(hwcfg)))
1729                                 return -EFAULT;
1730
1731                         if (hwcfg.irq == 2) hwcfg.irq = 9;
1732
1733                         if (hwcfg.irq < 0 || hwcfg.irq >= nr_irqs)
1734                                 return -EINVAL;
1735
1736                         if (!Ivec[hwcfg.irq].used && hwcfg.irq)
1737                         {
1738                                 if (request_irq(hwcfg.irq, scc_isr,
1739                                                 IRQF_DISABLED, "AX.25 SCC",
1740                                                 (void *)(long) hwcfg.irq))
1741                                         printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq);
1742                                 else
1743                                         Ivec[hwcfg.irq].used = 1;
1744                         }
1745
1746                         if (hwcfg.vector_latch && !Vector_Latch) {
1747                                 if (!request_region(hwcfg.vector_latch, 1, "scc vector latch"))
1748                                         printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch);
1749                                 else
1750                                         Vector_Latch = hwcfg.vector_latch;
1751                         }
1752
1753                         if (hwcfg.clock == 0)
1754                                 hwcfg.clock = SCC_DEFAULT_CLOCK;
1755
1756 #ifndef SCC_DONT_CHECK
1757
1758                         if(request_region(hwcfg.ctrl_a, 1, "scc-probe"))
1759                         {
1760                                 disable_irq(hwcfg.irq);
1761                                 Outb(hwcfg.ctrl_a, 0);
1762                                 OutReg(hwcfg.ctrl_a, R9, FHWRES);
1763                                 udelay(100);
1764                                 OutReg(hwcfg.ctrl_a,R13,0x55);          /* is this chip really there? */
1765                                 udelay(5);
1766
1767                                 if (InReg(hwcfg.ctrl_a,R13) != 0x55)
1768                                         found = 0;
1769                                 enable_irq(hwcfg.irq);
1770                                 release_region(hwcfg.ctrl_a, 1);
1771                         }
1772                         else
1773                                 found = 0;
1774 #endif
1775
1776                         if (found)
1777                         {
1778                                 SCC_Info[2*Nchips  ].ctrl = hwcfg.ctrl_a;
1779                                 SCC_Info[2*Nchips  ].data = hwcfg.data_a;
1780                                 SCC_Info[2*Nchips  ].irq  = hwcfg.irq;
1781                                 SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b;
1782                                 SCC_Info[2*Nchips+1].data = hwcfg.data_b;
1783                                 SCC_Info[2*Nchips+1].irq  = hwcfg.irq;
1784
1785                                 SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a;
1786                                 SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b;
1787                                 SCC_ctrl[Nchips].irq    = hwcfg.irq;
1788                         }
1789
1790
1791                         for (chan = 0; chan < 2; chan++)
1792                         {
1793                                 sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan);
1794
1795                                 SCC_Info[2*Nchips+chan].special = hwcfg.special;
1796                                 SCC_Info[2*Nchips+chan].clock = hwcfg.clock;
1797                                 SCC_Info[2*Nchips+chan].brand = hwcfg.brand;
1798                                 SCC_Info[2*Nchips+chan].option = hwcfg.option;
1799                                 SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc;
1800
1801 #ifdef SCC_DONT_CHECK
1802                                 printk(KERN_INFO "%s: data port = 0x%3.3x  control port = 0x%3.3x\n",
1803                                         device_name,
1804                                         SCC_Info[2*Nchips+chan].data,
1805                                         SCC_Info[2*Nchips+chan].ctrl);
1806
1807 #else
1808                                 printk(KERN_INFO "%s: data port = 0x%3.3lx  control port = 0x%3.3lx -- %s\n",
1809                                         device_name,
1810                                         chan? hwcfg.data_b : hwcfg.data_a,
1811                                         chan? hwcfg.ctrl_b : hwcfg.ctrl_a,
1812                                         found? "found" : "missing");
1813 #endif
1814
1815                                 if (found)
1816                                 {
1817                                         request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl");
1818                                         request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data");
1819                                         if (Nchips+chan != 0 &&
1820                                             scc_net_alloc(device_name,
1821                                                           &SCC_Info[2*Nchips+chan]))
1822                                             return -EINVAL;
1823                                 }
1824                         }
1825
1826                         if (found) Nchips++;
1827
1828                         return 0;
1829                 }
1830
1831                 if (cmd == SIOCSCCINI)
1832                 {
1833                         if (!capable(CAP_SYS_RAWIO))
1834                                 return -EPERM;
1835
1836                         if (Nchips == 0)
1837                                 return -EINVAL;
1838
1839                         z8530_init();
1840                         return 0;
1841                 }
1842
1843                 return -EINVAL; /* confuse the user */
1844         }
1845
1846         if (!scc->init)
1847         {
1848                 if (cmd == SIOCSCCCHANINI)
1849                 {
1850                         if (!capable(CAP_NET_ADMIN)) return -EPERM;
1851                         if (!arg) return -EINVAL;
1852
1853                         scc->stat.bufsize   = SCC_BUFSIZE;
1854
1855                         if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem)))
1856                                 return -EINVAL;
1857
1858                         /* default KISS Params */
1859
1860                         if (scc->modem.speed < 4800)
1861                         {
1862                                 scc->kiss.txdelay = 36;         /* 360 ms */
1863                                 scc->kiss.persist = 42;         /* 25% persistence */                   /* was 25 */
1864                                 scc->kiss.slottime = 16;        /* 160 ms */
1865                                 scc->kiss.tailtime = 4;         /* minimal reasonable value */
1866                                 scc->kiss.fulldup = 0;          /* CSMA */
1867                                 scc->kiss.waittime = 50;        /* 500 ms */
1868                                 scc->kiss.maxkeyup = 10;        /* 10 s */
1869                                 scc->kiss.mintime = 3;          /* 3 s */
1870                                 scc->kiss.idletime = 30;        /* 30 s */
1871                                 scc->kiss.maxdefer = 120;       /* 2 min */
1872                                 scc->kiss.softdcd = 0;          /* hardware dcd */
1873                         } else {
1874                                 scc->kiss.txdelay = 10;         /* 100 ms */
1875                                 scc->kiss.persist = 64;         /* 25% persistence */                   /* was 25 */
1876                                 scc->kiss.slottime = 8;         /* 160 ms */
1877                                 scc->kiss.tailtime = 1;         /* minimal reasonable value */
1878                                 scc->kiss.fulldup = 0;          /* CSMA */
1879                                 scc->kiss.waittime = 50;        /* 500 ms */
1880                                 scc->kiss.maxkeyup = 7;         /* 7 s */
1881                                 scc->kiss.mintime = 3;          /* 3 s */
1882                                 scc->kiss.idletime = 30;        /* 30 s */
1883                                 scc->kiss.maxdefer = 120;       /* 2 min */
1884                                 scc->kiss.softdcd = 0;          /* hardware dcd */
1885                         }
1886
1887                         scc->tx_buff = NULL;
1888                         skb_queue_head_init(&scc->tx_queue);
1889                         scc->init = 1;
1890
1891                         return 0;
1892                 }
1893
1894                 return -EINVAL;
1895         }
1896
1897         switch(cmd)
1898         {
1899                 case SIOCSCCRESERVED:
1900                         return -ENOIOCTLCMD;
1901
1902                 case SIOCSCCSMEM:
1903                         if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1904                         if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg)))
1905                                 return -EINVAL;
1906                         scc->stat.bufsize   = memcfg.bufsize;
1907                         return 0;
1908
1909                 case SIOCSCCGSTAT:
1910                         if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat)))
1911                                 return -EINVAL;
1912                         return 0;
1913
1914                 case SIOCSCCGKISS:
1915                         if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1916                                 return -EINVAL;
1917                         kiss_cmd.param = scc_get_param(scc, kiss_cmd.command);
1918                         if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd)))
1919                                 return -EINVAL;
1920                         return 0;
1921
1922                 case SIOCSCCSKISS:
1923                         if (!capable(CAP_NET_ADMIN)) return -EPERM;
1924                         if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1925                                 return -EINVAL;
1926                         return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param);
1927
1928                 case SIOCSCCCAL:
1929                         if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1930                         if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0)
1931                                 return -EINVAL;
1932
1933                         scc_start_calibrate(scc, cal.time, cal.pattern);
1934                         return 0;
1935
1936                 default:
1937                         return -ENOIOCTLCMD;
1938
1939         }
1940
1941         return -EINVAL;
1942 }
1943
1944 /* ----> set interface callsign <---- */
1945
1946 static int scc_net_set_mac_address(struct net_device *dev, void *addr)
1947 {
1948         struct sockaddr *sa = (struct sockaddr *) addr;
1949         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1950         return 0;
1951 }
1952
1953 /* ----> get statistics <---- */
1954
1955 static struct net_device_stats *scc_net_get_stats(struct net_device *dev)
1956 {
1957         struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1958
1959         scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over;
1960         scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under;
1961         scc->dev_stat.rx_fifo_errors = scc->stat.rx_over;
1962         scc->dev_stat.tx_fifo_errors = scc->stat.tx_under;
1963
1964         return &scc->dev_stat;
1965 }
1966
1967 /* ******************************************************************** */
1968 /* *            dump statistics to /proc/net/z8530drv                 * */
1969 /* ******************************************************************** */
1970
1971 #ifdef CONFIG_PROC_FS
1972
1973 static inline struct scc_channel *scc_net_seq_idx(loff_t pos)
1974 {
1975         int k;
1976
1977         for (k = 0; k < Nchips*2; ++k) {
1978                 if (!SCC_Info[k].init)
1979                         continue;
1980                 if (pos-- == 0)
1981                         return &SCC_Info[k];
1982         }
1983         return NULL;
1984 }
1985
1986 static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos)
1987 {
1988         return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1989
1990 }
1991
1992 static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1993 {
1994         unsigned k;
1995         struct scc_channel *scc = v;
1996         ++*pos;
1997
1998         for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1;
1999              k < Nchips*2; ++k) {
2000                 if (SCC_Info[k].init)
2001                         return &SCC_Info[k];
2002         }
2003         return NULL;
2004 }
2005
2006 static void scc_net_seq_stop(struct seq_file *seq, void *v)
2007 {
2008 }
2009
2010 static int scc_net_seq_show(struct seq_file *seq, void *v)
2011 {
2012         if (v == SEQ_START_TOKEN) {
2013                 seq_puts(seq, "z8530drv-"VERSION"\n");
2014         } else if (!Driver_Initialized) {
2015                 seq_puts(seq, "not initialized\n");
2016         } else if (!Nchips) {
2017                 seq_puts(seq, "chips missing\n");
2018         } else {
2019                 const struct scc_channel *scc = v;
2020                 const struct scc_stat *stat = &scc->stat;
2021                 const struct scc_kiss *kiss = &scc->kiss;
2022
2023
2024                 /* dev  data ctrl irq clock brand enh vector special option
2025                  *      baud nrz clocksrc softdcd bufsize
2026                  *      rxints txints exints spints
2027                  *      rcvd rxerrs over / xmit txerrs under / nospace bufsize
2028                  *      txd pers slot tail ful wait min maxk idl defr txof grp
2029                  *      W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
2030                  *      R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ##
2031                  */
2032
2033                 seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n",
2034                                 scc->dev->name,
2035                                 scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand,
2036                                 scc->enhanced, Vector_Latch, scc->special,
2037                                 scc->option);
2038                 seq_printf(seq, "\t%lu %d %d %d %d\n",
2039                                 scc->modem.speed, scc->modem.nrz,
2040                                 scc->modem.clocksrc, kiss->softdcd,
2041                                 stat->bufsize);
2042                 seq_printf(seq, "\t%lu %lu %lu %lu\n",
2043                                 stat->rxints, stat->txints, stat->exints, stat->spints);
2044                 seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n",
2045                                 stat->rxframes, stat->rxerrs, stat->rx_over,
2046                                 stat->txframes, stat->txerrs, stat->tx_under,
2047                                 stat->nospace,  stat->tx_state);
2048
2049 #define K(x) kiss->x
2050                 seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n",
2051                                 K(txdelay), K(persist), K(slottime), K(tailtime),
2052                                 K(fulldup), K(waittime), K(mintime), K(maxkeyup),
2053                                 K(idletime), K(maxdefer), K(tx_inhibit), K(group));
2054 #undef K
2055 #ifdef SCC_DEBUG
2056                 {
2057                         int reg;
2058
2059                 seq_printf(seq, "\tW ");
2060                         for (reg = 0; reg < 16; reg++)
2061                                 seq_printf(seq, "%2.2x ", scc->wreg[reg]);
2062                         seq_printf(seq, "\n");
2063
2064                 seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1));
2065                         for (reg = 3; reg < 8; reg++)
2066                                 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2067                         seq_printf(seq, "XX ");
2068                         for (reg = 9; reg < 16; reg++)
2069                                 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2070                         seq_printf(seq, "\n");
2071                 }
2072 #endif
2073                 seq_putc(seq, '\n');
2074         }
2075
2076         return 0;
2077 }
2078
2079 static const struct seq_operations scc_net_seq_ops = {
2080         .start  = scc_net_seq_start,
2081         .next   = scc_net_seq_next,
2082         .stop   = scc_net_seq_stop,
2083         .show   = scc_net_seq_show,
2084 };
2085
2086
2087 static int scc_net_seq_open(struct inode *inode, struct file *file)
2088 {
2089         return seq_open(file, &scc_net_seq_ops);
2090 }
2091
2092 static const struct file_operations scc_net_seq_fops = {
2093         .owner   = THIS_MODULE,
2094         .open    = scc_net_seq_open,
2095         .read    = seq_read,
2096         .llseek  = seq_lseek,
2097         .release = seq_release_private,
2098 };
2099
2100 #endif /* CONFIG_PROC_FS */
2101
2102
2103 /* ******************************************************************** */
2104 /* *                    Init SCC driver                               * */
2105 /* ******************************************************************** */
2106
2107 static int __init scc_init_driver (void)
2108 {
2109         char devname[IFNAMSIZ];
2110
2111         printk(banner);
2112
2113         sprintf(devname,"%s0", SCC_DriverName);
2114
2115         rtnl_lock();
2116         if (scc_net_alloc(devname, SCC_Info)) {
2117                 rtnl_unlock();
2118                 printk(KERN_ERR "z8530drv: cannot initialize module\n");
2119                 return -EIO;
2120         }
2121         rtnl_unlock();
2122
2123         proc_net_fops_create(&init_net, "z8530drv", 0, &scc_net_seq_fops);
2124
2125         return 0;
2126 }
2127
2128 static void __exit scc_cleanup_driver(void)
2129 {
2130         io_port ctrl;
2131         int k;
2132         struct scc_channel *scc;
2133         struct net_device *dev;
2134
2135         if (Nchips == 0 && (dev = SCC_Info[0].dev))
2136         {
2137                 unregister_netdev(dev);
2138                 free_netdev(dev);
2139         }
2140
2141         /* Guard against chip prattle */
2142         local_irq_disable();
2143
2144         for (k = 0; k < Nchips; k++)
2145                 if ( (ctrl = SCC_ctrl[k].chan_A) )
2146                 {
2147                         Outb(ctrl, 0);
2148                         OutReg(ctrl,R9,FHWRES); /* force hardware reset */
2149                         udelay(50);
2150                 }
2151
2152         /* To unload the port must be closed so no real IRQ pending */
2153         for (k = 0; k < nr_irqs ; k++)
2154                 if (Ivec[k].used) free_irq(k, NULL);
2155
2156         local_irq_enable();
2157
2158         /* Now clean up */
2159         for (k = 0; k < Nchips*2; k++)
2160         {
2161                 scc = &SCC_Info[k];
2162                 if (scc->ctrl)
2163                 {
2164                         release_region(scc->ctrl, 1);
2165                         release_region(scc->data, 1);
2166                 }
2167                 if (scc->dev)
2168                 {
2169                         unregister_netdev(scc->dev);
2170                         free_netdev(scc->dev);
2171                 }
2172         }
2173
2174
2175         if (Vector_Latch)
2176                 release_region(Vector_Latch, 1);
2177
2178         proc_net_remove(&init_net, "z8530drv");
2179 }
2180
2181 MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>");
2182 MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards");
2183 MODULE_SUPPORTED_DEVICE("Z8530 based SCC cards for Amateur Radio");
2184 MODULE_LICENSE("GPL");
2185 module_init(scc_init_driver);
2186 module_exit(scc_cleanup_driver);