1318 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*****************************************************************************/3 4/*5 * baycom_epp.c -- baycom epp radio modem driver.6 *7 * Copyright (C) 1998-20008 * Thomas Sailer (sailer@ife.ee.ethz.ch)9 *10 * Please note that the GPL allows you to use the driver, NOT the radio.11 * In order to use the radio, you need a license from the communications12 * authority of your country.13 *14 * History:15 * 0.1 xx.xx.1998 Initial version by Matthias Welwarsky (dg2fef)16 * 0.2 21.04.1998 Massive rework by Thomas Sailer17 * Integrated FPGA EPP modem configuration routines18 * 0.3 11.05.1998 Took FPGA config out and moved it into a separate program19 * 0.4 26.07.1999 Adapted to new lowlevel parport driver interface20 * 0.5 03.08.1999 adapt to Linus' new __setup/__initcall21 * removed some pre-2.2 kernel compatibility cruft22 * 0.6 10.08.1999 Check if parport can do SPP and is safe to access during interrupt contexts23 * 0.7 12.02.2000 adapted to softnet driver interface24 */25 26/*****************************************************************************/27 28#include <linux/crc-ccitt.h>29#include <linux/module.h>30#include <linux/kernel.h>31#include <linux/init.h>32#include <linux/sched.h>33#include <linux/string.h>34#include <linux/workqueue.h>35#include <linux/fs.h>36#include <linux/parport.h>37#include <linux/if_arp.h>38#include <linux/hdlcdrv.h>39#include <linux/baycom.h>40#include <linux/jiffies.h>41#include <linux/random.h>42#include <net/ax25.h> 43#include <linux/uaccess.h>44 45/* --------------------------------------------------------------------- */46 47#define BAYCOM_DEBUG48#define BAYCOM_MAGIC 1973051049 50/* --------------------------------------------------------------------- */51 52static const char paranoia_str[] = KERN_ERR 53 "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";54 55static const char bc_drvname[] = "baycom_epp";56static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"57"baycom_epp: version 0.7\n";58 59/* --------------------------------------------------------------------- */60 61#define NR_PORTS 462 63static struct net_device *baycom_device[NR_PORTS];64 65/* --------------------------------------------------------------------- */66 67/* EPP status register */68#define EPP_DCDBIT 0x8069#define EPP_PTTBIT 0x0870#define EPP_NREF 0x0171#define EPP_NRAEF 0x0272#define EPP_NRHF 0x0473#define EPP_NTHF 0x2074#define EPP_NTAEF 0x1075#define EPP_NTEF EPP_PTTBIT76 77/* EPP control register */78#define EPP_TX_FIFO_ENABLE 0x1079#define EPP_RX_FIFO_ENABLE 0x0880#define EPP_MODEM_ENABLE 0x2081#define EPP_LEDS 0xC082#define EPP_IRQ_ENABLE 0x1083 84/* LPT registers */85#define LPTREG_ECONTROL 0x40286#define LPTREG_CONFIGB 0x40187#define LPTREG_CONFIGA 0x40088#define LPTREG_EPPDATA 0x00489#define LPTREG_EPPADDR 0x00390#define LPTREG_CONTROL 0x00291#define LPTREG_STATUS 0x00192#define LPTREG_DATA 0x00093 94/* LPT control register */95#define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */96#define LPTCTRL_WRITE 0x0197#define LPTCTRL_ADDRSTB 0x0898#define LPTCTRL_DATASTB 0x0299#define LPTCTRL_INTEN 0x10100 101/* LPT status register */102#define LPTSTAT_SHIFT_NINTR 6103#define LPTSTAT_WAIT 0x80104#define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR)105#define LPTSTAT_PE 0x20106#define LPTSTAT_DONE 0x10107#define LPTSTAT_NERROR 0x08108#define LPTSTAT_EPPTIMEOUT 0x01109 110/* LPT data register */111#define LPTDATA_SHIFT_TDI 0112#define LPTDATA_SHIFT_TMS 2113#define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI)114#define LPTDATA_TCK 0x02115#define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS)116#define LPTDATA_INITBIAS 0x80117 118 119/* EPP modem config/status bits */120#define EPP_DCDBIT 0x80121#define EPP_PTTBIT 0x08122#define EPP_RXEBIT 0x01123#define EPP_RXAEBIT 0x02124#define EPP_RXHFULL 0x04125 126#define EPP_NTHF 0x20127#define EPP_NTAEF 0x10128#define EPP_NTEF EPP_PTTBIT129 130#define EPP_TX_FIFO_ENABLE 0x10131#define EPP_RX_FIFO_ENABLE 0x08132#define EPP_MODEM_ENABLE 0x20133#define EPP_LEDS 0xC0134#define EPP_IRQ_ENABLE 0x10135 136/* Xilinx 4k JTAG instructions */137#define XC4K_IRLENGTH 3138#define XC4K_EXTEST 0139#define XC4K_PRELOAD 1140#define XC4K_CONFIGURE 5141#define XC4K_BYPASS 7142 143#define EPP_CONVENTIONAL 0144#define EPP_FPGA 1145#define EPP_FPGAEXTSTATUS 2146 147#define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8)148 149/* ---------------------------------------------------------------------- */150/*151 * Information that need to be kept for each board.152 */153 154struct baycom_state {155 int magic;156 157 struct pardevice *pdev;158 struct net_device *dev;159 unsigned int work_running;160 struct delayed_work run_work;161 unsigned int modem;162 unsigned int bitrate;163 unsigned char stat;164 165 struct {166 unsigned int intclk;167 unsigned int fclk;168 unsigned int bps;169 unsigned int extmodem;170 unsigned int loopback;171 } cfg;172 173 struct hdlcdrv_channel_params ch_params;174 175 struct {176 unsigned int bitbuf, bitstream, numbits, state;177 unsigned char *bufptr;178 int bufcnt;179 unsigned char buf[TXBUFFER_SIZE];180 } hdlcrx;181 182 struct {183 int calibrate;184 int slotcnt;185 int flags;186 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;187 unsigned char *bufptr;188 int bufcnt;189 unsigned char buf[TXBUFFER_SIZE];190 } hdlctx;191 192 unsigned int ptt_keyed;193 struct sk_buff *skb; /* next transmit packet */194 195#ifdef BAYCOM_DEBUG196 struct debug_vals {197 unsigned long last_jiffies;198 unsigned cur_intcnt;199 unsigned last_intcnt;200 int cur_pllcorr;201 int last_pllcorr;202 unsigned int mod_cycles;203 unsigned int demod_cycles;204 } debug_vals;205#endif /* BAYCOM_DEBUG */206};207 208/* --------------------------------------------------------------------- */209 210#define KISS_VERBOSE211 212/* --------------------------------------------------------------------- */213 214#define PARAM_TXDELAY 1215#define PARAM_PERSIST 2216#define PARAM_SLOTTIME 3217#define PARAM_TXTAIL 4218#define PARAM_FULLDUP 5219#define PARAM_HARDWARE 6220#define PARAM_RETURN 255221 222/* --------------------------------------------------------------------- */223/*224 * the CRC routines are stolen from WAMPES225 * by Dieter Deyke226 */227 228 229/*---------------------------------------------------------------------------*/230 231#if 0232static inline void append_crc_ccitt(unsigned char *buffer, int len)233{234 unsigned int crc = 0xffff;235 236 for (;len>0;len--)237 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];238 crc ^= 0xffff;239 *buffer++ = crc;240 *buffer++ = crc >> 8;241}242#endif243 244/*---------------------------------------------------------------------------*/245 246static inline int check_crc_ccitt(const unsigned char *buf, int cnt)247{248 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;249}250 251/*---------------------------------------------------------------------------*/252 253static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)254{255 return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;256}257 258/* ---------------------------------------------------------------------- */259 260#define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)261 262/* --------------------------------------------------------------------- */263 264static inline void baycom_int_freq(struct baycom_state *bc)265{266#ifdef BAYCOM_DEBUG267 unsigned long cur_jiffies = jiffies;268 /*269 * measure the interrupt frequency270 */271 bc->debug_vals.cur_intcnt++;272 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {273 bc->debug_vals.last_jiffies = cur_jiffies;274 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;275 bc->debug_vals.cur_intcnt = 0;276 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;277 bc->debug_vals.cur_pllcorr = 0;278 }279#endif /* BAYCOM_DEBUG */280}281 282/* ---------------------------------------------------------------------- */283/*284 * eppconfig_path should be setable via /proc/sys.285 */286 287static char const eppconfig_path[] = "/usr/sbin/eppfpga";288 289static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };290 291/* eppconfig: called during ifconfig up to configure the modem */292static int eppconfig(struct baycom_state *bc)293{294 char modearg[256];295 char portarg[16];296 char *argv[] = {297 (char *)eppconfig_path,298 "-s",299 "-p", portarg,300 "-m", modearg,301 NULL };302 303 /* set up arguments */304 sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",305 bc->cfg.intclk ? "int" : "ext",306 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,307 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),308 bc->cfg.loopback ? ",loopback" : "");309 sprintf(portarg, "%ld", bc->pdev->port->base);310 printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);311 312 return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC);313}314 315/* ---------------------------------------------------------------------- */316 317static inline void do_kiss_params(struct baycom_state *bc,318 unsigned char *data, unsigned long len)319{320 321#ifdef KISS_VERBOSE322#define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)323#else /* KISS_VERBOSE */ 324#define PKP(a,b) 325#endif /* KISS_VERBOSE */ 326 327 if (len < 2)328 return;329 switch(data[0]) {330 case PARAM_TXDELAY:331 bc->ch_params.tx_delay = data[1];332 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);333 break;334 case PARAM_PERSIST: 335 bc->ch_params.ppersist = data[1];336 PKP("p persistence = %u", bc->ch_params.ppersist);337 break;338 case PARAM_SLOTTIME: 339 bc->ch_params.slottime = data[1];340 PKP("slot time = %ums", bc->ch_params.slottime);341 break;342 case PARAM_TXTAIL: 343 bc->ch_params.tx_tail = data[1];344 PKP("TX tail = %ums", bc->ch_params.tx_tail);345 break;346 case PARAM_FULLDUP: 347 bc->ch_params.fulldup = !!data[1];348 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");349 break;350 default:351 break;352 }353#undef PKP354}355 356/* --------------------------------------------------------------------- */357 358static void encode_hdlc(struct baycom_state *bc)359{360 struct sk_buff *skb;361 unsigned char *wp, *bp;362 int pkt_len;363 unsigned bitstream, notbitstream, bitbuf, numbit, crc;364 unsigned char crcarr[2];365 int j;366 367 if (bc->hdlctx.bufcnt > 0)368 return;369 skb = bc->skb;370 if (!skb)371 return;372 bc->skb = NULL;373 pkt_len = skb->len-1; /* strip KISS byte */374 wp = bc->hdlctx.buf;375 bp = skb->data+1;376 crc = calc_crc_ccitt(bp, pkt_len);377 crcarr[0] = crc;378 crcarr[1] = crc >> 8;379 *wp++ = 0x7e;380 bitstream = bitbuf = numbit = 0;381 while (pkt_len > -2) {382 bitstream >>= 8;383 bitstream |= ((unsigned int)*bp) << 8;384 bitbuf |= ((unsigned int)*bp) << numbit;385 notbitstream = ~bitstream;386 bp++;387 pkt_len--;388 if (!pkt_len)389 bp = crcarr;390 for (j = 0; j < 8; j++)391 if (unlikely(!(notbitstream & (0x1f0 << j)))) {392 bitstream &= ~(0x100 << j);393 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |394 ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);395 numbit++;396 notbitstream = ~bitstream;397 }398 numbit += 8;399 while (numbit >= 8) {400 *wp++ = bitbuf;401 bitbuf >>= 8;402 numbit -= 8;403 }404 }405 bitbuf |= 0x7e7e << numbit;406 numbit += 16;407 while (numbit >= 8) {408 *wp++ = bitbuf;409 bitbuf >>= 8;410 numbit -= 8;411 }412 bc->hdlctx.bufptr = bc->hdlctx.buf;413 bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;414 dev_kfree_skb(skb);415 bc->dev->stats.tx_packets++;416}417 418/* ---------------------------------------------------------------------- */419 420static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)421{422 struct parport *pp = bc->pdev->port;423 unsigned char tmp[128];424 int i, j;425 426 if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))427 bc->hdlctx.state = tx_idle;428 if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {429 if (bc->hdlctx.bufcnt <= 0)430 encode_hdlc(bc);431 if (bc->hdlctx.bufcnt <= 0)432 return 0;433 if (!bc->ch_params.fulldup) {434 if (!(stat & EPP_DCDBIT)) {435 bc->hdlctx.slotcnt = bc->ch_params.slottime;436 return 0;437 }438 if ((--bc->hdlctx.slotcnt) > 0)439 return 0;440 bc->hdlctx.slotcnt = bc->ch_params.slottime;441 if (get_random_u8() > bc->ch_params.ppersist)442 return 0;443 }444 }445 if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {446 bc->hdlctx.state = tx_keyup;447 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);448 bc->ptt_keyed++;449 }450 while (cnt > 0) {451 switch (bc->hdlctx.state) {452 case tx_keyup:453 i = min_t(int, cnt, bc->hdlctx.flags);454 cnt -= i;455 bc->hdlctx.flags -= i;456 if (bc->hdlctx.flags <= 0)457 bc->hdlctx.state = tx_data;458 memset(tmp, 0x7e, sizeof(tmp));459 while (i > 0) {460 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;461 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))462 return -1;463 i -= j;464 }465 break;466 467 case tx_data:468 if (bc->hdlctx.bufcnt <= 0) {469 encode_hdlc(bc);470 if (bc->hdlctx.bufcnt <= 0) {471 bc->hdlctx.state = tx_tail;472 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);473 break;474 }475 }476 i = min_t(int, cnt, bc->hdlctx.bufcnt);477 bc->hdlctx.bufcnt -= i;478 cnt -= i;479 if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))480 return -1;481 bc->hdlctx.bufptr += i;482 break;483 484 case tx_tail:485 encode_hdlc(bc);486 if (bc->hdlctx.bufcnt > 0) {487 bc->hdlctx.state = tx_data;488 break;489 }490 i = min_t(int, cnt, bc->hdlctx.flags);491 if (i) {492 cnt -= i;493 bc->hdlctx.flags -= i;494 memset(tmp, 0x7e, sizeof(tmp));495 while (i > 0) {496 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;497 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))498 return -1;499 i -= j;500 }501 break;502 }503 fallthrough;504 505 default:506 if (bc->hdlctx.calibrate <= 0)507 return 0;508 i = min_t(int, cnt, bc->hdlctx.calibrate);509 cnt -= i;510 bc->hdlctx.calibrate -= i;511 memset(tmp, 0, sizeof(tmp));512 while (i > 0) {513 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;514 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))515 return -1;516 i -= j;517 }518 break;519 }520 }521 return 0;522}523 524/* ---------------------------------------------------------------------- */525 526static void do_rxpacket(struct net_device *dev)527{528 struct baycom_state *bc = netdev_priv(dev);529 struct sk_buff *skb;530 unsigned char *cp;531 unsigned pktlen;532 533 if (bc->hdlcrx.bufcnt < 4) 534 return;535 if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt)) 536 return;537 pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */538 if (!(skb = dev_alloc_skb(pktlen))) {539 printk("%s: memory squeeze, dropping packet\n", dev->name);540 dev->stats.rx_dropped++;541 return;542 }543 cp = skb_put(skb, pktlen);544 *cp++ = 0; /* KISS kludge */545 memcpy(cp, bc->hdlcrx.buf, pktlen - 1);546 skb->protocol = ax25_type_trans(skb, dev);547 netif_rx(skb);548 dev->stats.rx_packets++;549}550 551static int receive(struct net_device *dev, int cnt)552{553 struct baycom_state *bc = netdev_priv(dev);554 struct parport *pp = bc->pdev->port;555 unsigned int bitbuf, notbitstream, bitstream, numbits, state;556 unsigned char tmp[128];557 unsigned char *cp;558 int cnt2, ret = 0;559 int j;560 561 numbits = bc->hdlcrx.numbits;562 state = bc->hdlcrx.state;563 bitstream = bc->hdlcrx.bitstream;564 bitbuf = bc->hdlcrx.bitbuf;565 while (cnt > 0) {566 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;567 cnt -= cnt2;568 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {569 ret = -1;570 break;571 }572 cp = tmp;573 for (; cnt2 > 0; cnt2--, cp++) {574 bitstream >>= 8;575 bitstream |= (*cp) << 8;576 bitbuf >>= 8;577 bitbuf |= (*cp) << 8;578 numbits += 8;579 notbitstream = ~bitstream;580 for (j = 0; j < 8; j++) {581 582 /* flag or abort */583 if (unlikely(!(notbitstream & (0x0fc << j)))) {584 585 /* abort received */586 if (!(notbitstream & (0x1fc << j)))587 state = 0;588 589 /* flag received */590 else if ((bitstream & (0x1fe << j)) == (0x0fc << j)) {591 if (state)592 do_rxpacket(dev);593 bc->hdlcrx.bufcnt = 0;594 bc->hdlcrx.bufptr = bc->hdlcrx.buf;595 state = 1;596 numbits = 7-j;597 }598 }599 600 /* stuffed bit */601 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {602 numbits--;603 bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);604 }605 }606 while (state && numbits >= 8) {607 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {608 state = 0;609 } else {610 *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);611 bc->hdlcrx.bufcnt++;612 numbits -= 8;613 }614 }615 }616 }617 bc->hdlcrx.numbits = numbits;618 bc->hdlcrx.state = state;619 bc->hdlcrx.bitstream = bitstream;620 bc->hdlcrx.bitbuf = bitbuf;621 return ret;622}623 624/* --------------------------------------------------------------------- */625 626#define GETTICK(x) \627({ \628 x = (unsigned int)get_cycles(); \629})630 631static void epp_bh(struct work_struct *work)632{633 struct net_device *dev;634 struct baycom_state *bc;635 struct parport *pp;636 unsigned char stat;637 unsigned char tmp[2];638 unsigned int time1 = 0, time2 = 0, time3 = 0;639 int cnt, cnt2;640 641 bc = container_of(work, struct baycom_state, run_work.work);642 dev = bc->dev;643 if (!bc->work_running)644 return;645 baycom_int_freq(bc);646 pp = bc->pdev->port;647 /* update status */648 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)649 goto epptimeout;650 bc->stat = stat;651 bc->debug_vals.last_pllcorr = stat;652 GETTICK(time1);653 if (bc->modem == EPP_FPGAEXTSTATUS) {654 /* get input count */655 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;656 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)657 goto epptimeout;658 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)659 goto epptimeout;660 cnt = tmp[0] | (tmp[1] << 8);661 cnt &= 0x7fff;662 /* get output count */663 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;664 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)665 goto epptimeout;666 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)667 goto epptimeout;668 cnt2 = tmp[0] | (tmp[1] << 8);669 cnt2 = 16384 - (cnt2 & 0x7fff);670 /* return to normal */671 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;672 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)673 goto epptimeout;674 if (transmit(bc, cnt2, stat))675 goto epptimeout;676 GETTICK(time2);677 if (receive(dev, cnt))678 goto epptimeout;679 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)680 goto epptimeout;681 bc->stat = stat;682 } else {683 /* try to tx */684 switch (stat & (EPP_NTAEF|EPP_NTHF)) {685 case EPP_NTHF:686 cnt = 2048 - 256;687 break;688 689 case EPP_NTAEF:690 cnt = 2048 - 1793;691 break;692 693 case 0:694 cnt = 0;695 break;696 697 default:698 cnt = 2048 - 1025;699 break;700 }701 if (transmit(bc, cnt, stat))702 goto epptimeout;703 GETTICK(time2);704 /* do receiver */705 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {706 switch (stat & (EPP_NRAEF|EPP_NRHF)) {707 case EPP_NRAEF:708 cnt = 1025;709 break;710 711 case 0:712 cnt = 1793;713 break;714 715 default:716 cnt = 256;717 break;718 }719 if (receive(dev, cnt))720 goto epptimeout;721 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)722 goto epptimeout;723 }724 cnt = 0;725 if (bc->bitrate < 50000)726 cnt = 256;727 else if (bc->bitrate < 100000)728 cnt = 128;729 while (cnt > 0 && stat & EPP_NREF) {730 if (receive(dev, 1))731 goto epptimeout;732 cnt--;733 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)734 goto epptimeout;735 }736 }737 GETTICK(time3);738#ifdef BAYCOM_DEBUG739 bc->debug_vals.mod_cycles = time2 - time1;740 bc->debug_vals.demod_cycles = time3 - time2;741#endif /* BAYCOM_DEBUG */742 schedule_delayed_work(&bc->run_work, 1);743 if (!bc->skb)744 netif_wake_queue(dev);745 return;746 epptimeout:747 printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);748}749 750/* ---------------------------------------------------------------------- */751/*752 * ===================== network driver interface =========================753 */754 755static netdev_tx_t baycom_send_packet(struct sk_buff *skb, struct net_device *dev)756{757 struct baycom_state *bc = netdev_priv(dev);758 759 if (skb->protocol == htons(ETH_P_IP))760 return ax25_ip_xmit(skb);761 762 if (skb->data[0] != 0) {763 do_kiss_params(bc, skb->data, skb->len);764 dev_kfree_skb(skb);765 return NETDEV_TX_OK;766 }767 if (bc->skb) {768 dev_kfree_skb(skb);769 return NETDEV_TX_OK;770 }771 /* strip KISS byte */772 if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {773 dev_kfree_skb(skb);774 return NETDEV_TX_OK;775 }776 netif_stop_queue(dev);777 bc->skb = skb;778 return NETDEV_TX_OK;779}780 781/* --------------------------------------------------------------------- */782 783static int baycom_set_mac_address(struct net_device *dev, void *addr)784{785 struct sockaddr *sa = (struct sockaddr *)addr;786 787 /* addr is an AX.25 shifted ASCII mac address */788 dev_addr_set(dev, sa->sa_data);789 return 0; 790}791 792/* --------------------------------------------------------------------- */793 794static void epp_wakeup(void *handle)795{796 struct net_device *dev = (struct net_device *)handle;797 struct baycom_state *bc = netdev_priv(dev);798 799 printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);800 if (!parport_claim(bc->pdev))801 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);802}803 804/* --------------------------------------------------------------------- */805 806/*807 * Open/initialize the board. This is called (in the current kernel)808 * sometime after booting when the 'ifconfig' program is run.809 *810 * This routine should set everything up anew at each open, even811 * registers that "should" only need to be set once at boot, so that812 * there is non-reboot way to recover if something goes wrong.813 */814 815static int epp_open(struct net_device *dev)816{817 struct baycom_state *bc = netdev_priv(dev);818 struct parport *pp = parport_find_base(dev->base_addr);819 unsigned int i, j;820 unsigned char tmp[128];821 unsigned char stat;822 unsigned long tstart;823 struct pardev_cb par_cb;824 825 if (!pp) {826 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);827 return -ENXIO;828 }829#if 0830 if (pp->irq < 0) {831 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);832 parport_put_port(pp);833 return -ENXIO;834 }835#endif836 if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {837 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",838 bc_drvname, pp->base);839 parport_put_port(pp);840 return -EIO;841 }842 memset(&bc->modem, 0, sizeof(bc->modem));843 memset(&par_cb, 0, sizeof(par_cb));844 par_cb.wakeup = epp_wakeup;845 par_cb.private = (void *)dev;846 par_cb.flags = PARPORT_DEV_EXCL;847 for (i = 0; i < NR_PORTS; i++)848 if (baycom_device[i] == dev)849 break;850 851 if (i == NR_PORTS) {852 pr_err("%s: no device found\n", bc_drvname);853 parport_put_port(pp);854 return -ENODEV;855 }856 857 bc->pdev = parport_register_dev_model(pp, dev->name, &par_cb, i);858 parport_put_port(pp);859 if (!bc->pdev) {860 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);861 return -ENXIO;862 }863 if (parport_claim(bc->pdev)) {864 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);865 parport_unregister_device(bc->pdev);866 return -EBUSY;867 }868 dev->irq = /*pp->irq*/ 0;869 INIT_DELAYED_WORK(&bc->run_work, epp_bh);870 bc->work_running = 1;871 bc->modem = EPP_CONVENTIONAL;872 if (eppconfig(bc))873 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);874 else875 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;876 parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */877 /* reset the modem */878 tmp[0] = 0;879 tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;880 if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)881 goto epptimeout;882 /* autoprobe baud rate */883 tstart = jiffies;884 i = 0;885 while (time_before(jiffies, tstart + HZ/3)) {886 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)887 goto epptimeout;888 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {889 schedule();890 continue;891 }892 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)893 goto epptimeout;894 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)895 goto epptimeout;896 i += 256;897 }898 for (j = 0; j < 256; j++) {899 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)900 goto epptimeout;901 if (!(stat & EPP_NREF))902 break;903 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)904 goto epptimeout;905 i++;906 }907 tstart = jiffies - tstart;908 bc->bitrate = i * (8 * HZ) / tstart;909 j = 1;910 i = bc->bitrate >> 3;911 while (j < 7 && i > 150) {912 j++;913 i >>= 1;914 }915 printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n", 916 bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));917 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;918 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)919 goto epptimeout;920 /*921 * initialise hdlc variables922 */923 bc->hdlcrx.state = 0;924 bc->hdlcrx.numbits = 0;925 bc->hdlctx.state = tx_idle;926 bc->hdlctx.bufcnt = 0;927 bc->hdlctx.slotcnt = bc->ch_params.slottime;928 bc->hdlctx.calibrate = 0;929 /* start the bottom half stuff */930 schedule_delayed_work(&bc->run_work, 1);931 netif_start_queue(dev);932 return 0;933 934 epptimeout:935 printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);936 parport_write_control(pp, 0); /* reset the adapter */937 parport_release(bc->pdev);938 parport_unregister_device(bc->pdev);939 return -EIO;940}941 942/* --------------------------------------------------------------------- */943 944static int epp_close(struct net_device *dev)945{946 struct baycom_state *bc = netdev_priv(dev);947 struct parport *pp = bc->pdev->port;948 unsigned char tmp[1];949 950 bc->work_running = 0;951 cancel_delayed_work_sync(&bc->run_work);952 bc->stat = EPP_DCDBIT;953 tmp[0] = 0;954 pp->ops->epp_write_addr(pp, tmp, 1, 0);955 parport_write_control(pp, 0); /* reset the adapter */956 parport_release(bc->pdev);957 parport_unregister_device(bc->pdev);958 dev_kfree_skb(bc->skb);959 bc->skb = NULL;960 printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",961 bc_drvname, dev->base_addr, dev->irq);962 return 0;963}964 965/* --------------------------------------------------------------------- */966 967static int baycom_setmode(struct baycom_state *bc, const char *modestr)968{969 const char *cp;970 971 if (strstr(modestr,"intclk"))972 bc->cfg.intclk = 1;973 if (strstr(modestr,"extclk"))974 bc->cfg.intclk = 0;975 if (strstr(modestr,"intmodem"))976 bc->cfg.extmodem = 0;977 if (strstr(modestr,"extmodem"))978 bc->cfg.extmodem = 1;979 if (strstr(modestr,"loopback"))980 bc->cfg.loopback = 1;981 if (strstr(modestr, "noloopback"))982 bc->cfg.loopback = 0;983 if ((cp = strstr(modestr,"fclk="))) {984 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);985 if (bc->cfg.fclk < 1000000)986 bc->cfg.fclk = 1000000;987 if (bc->cfg.fclk > 25000000)988 bc->cfg.fclk = 25000000;989 }990 if ((cp = strstr(modestr,"bps="))) {991 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);992 if (bc->cfg.bps < 1000)993 bc->cfg.bps = 1000;994 if (bc->cfg.bps > 1500000)995 bc->cfg.bps = 1500000;996 }997 return 0;998}999 1000/* --------------------------------------------------------------------- */1001 1002static int baycom_siocdevprivate(struct net_device *dev, struct ifreq *ifr,1003 void __user *data, int cmd)1004{1005 struct baycom_state *bc = netdev_priv(dev);1006 struct hdlcdrv_ioctl hi;1007 1008 if (cmd != SIOCDEVPRIVATE)1009 return -ENOIOCTLCMD;1010 1011 if (copy_from_user(&hi, data, sizeof(hi)))1012 return -EFAULT;1013 switch (hi.cmd) {1014 default:1015 return -ENOIOCTLCMD;1016 1017 case HDLCDRVCTL_GETCHANNELPAR:1018 hi.data.cp.tx_delay = bc->ch_params.tx_delay;1019 hi.data.cp.tx_tail = bc->ch_params.tx_tail;1020 hi.data.cp.slottime = bc->ch_params.slottime;1021 hi.data.cp.ppersist = bc->ch_params.ppersist;1022 hi.data.cp.fulldup = bc->ch_params.fulldup;1023 break;1024 1025 case HDLCDRVCTL_SETCHANNELPAR:1026 if (!capable(CAP_NET_ADMIN))1027 return -EACCES;1028 bc->ch_params.tx_delay = hi.data.cp.tx_delay;1029 bc->ch_params.tx_tail = hi.data.cp.tx_tail;1030 bc->ch_params.slottime = hi.data.cp.slottime;1031 bc->ch_params.ppersist = hi.data.cp.ppersist;1032 bc->ch_params.fulldup = hi.data.cp.fulldup;1033 bc->hdlctx.slotcnt = 1;1034 return 0;1035 1036 case HDLCDRVCTL_GETMODEMPAR:1037 hi.data.mp.iobase = dev->base_addr;1038 hi.data.mp.irq = dev->irq;1039 hi.data.mp.dma = dev->dma;1040 hi.data.mp.dma2 = 0;1041 hi.data.mp.seriobase = 0;1042 hi.data.mp.pariobase = 0;1043 hi.data.mp.midiiobase = 0;1044 break;1045 1046 case HDLCDRVCTL_SETMODEMPAR:1047 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))1048 return -EACCES;1049 dev->base_addr = hi.data.mp.iobase;1050 dev->irq = /*hi.data.mp.irq*/0;1051 dev->dma = /*hi.data.mp.dma*/0;1052 return 0; 1053 1054 case HDLCDRVCTL_GETSTAT:1055 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);1056 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);1057 hi.data.cs.ptt_keyed = bc->ptt_keyed;1058 hi.data.cs.tx_packets = dev->stats.tx_packets;1059 hi.data.cs.tx_errors = dev->stats.tx_errors;1060 hi.data.cs.rx_packets = dev->stats.rx_packets;1061 hi.data.cs.rx_errors = dev->stats.rx_errors;1062 break; 1063 1064 case HDLCDRVCTL_OLDGETSTAT:1065 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);1066 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);1067 hi.data.ocs.ptt_keyed = bc->ptt_keyed;1068 break; 1069 1070 case HDLCDRVCTL_CALIBRATE:1071 if (!capable(CAP_SYS_RAWIO))1072 return -EACCES;1073 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;1074 return 0;1075 1076 case HDLCDRVCTL_DRIVERNAME:1077 strscpy_pad(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));1078 break;1079 1080 case HDLCDRVCTL_GETMODE:1081 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s", 1082 bc->cfg.intclk ? "int" : "ext",1083 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,1084 bc->cfg.loopback ? ",loopback" : "");1085 break;1086 1087 case HDLCDRVCTL_SETMODE:1088 if (!capable(CAP_NET_ADMIN) || netif_running(dev))1089 return -EACCES;1090 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';1091 return baycom_setmode(bc, hi.data.modename);1092 1093 case HDLCDRVCTL_MODELIST:1094 strscpy_pad(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",1095 sizeof(hi.data.modename));1096 break;1097 1098 case HDLCDRVCTL_MODEMPARMASK:1099 return HDLCDRV_PARMASK_IOBASE;1100 1101 }1102 if (copy_to_user(data, &hi, sizeof(hi)))1103 return -EFAULT;1104 return 0;1105}1106 1107/* --------------------------------------------------------------------- */1108 1109static const struct net_device_ops baycom_netdev_ops = {1110 .ndo_open = epp_open,1111 .ndo_stop = epp_close,1112 .ndo_siocdevprivate = baycom_siocdevprivate,1113 .ndo_start_xmit = baycom_send_packet,1114 .ndo_set_mac_address = baycom_set_mac_address,1115};1116 1117/*1118 * Check for a network adaptor of this type, and return '0' if one exists.1119 * If dev->base_addr == 0, probe all likely locations.1120 * If dev->base_addr == 1, always return failure.1121 * If dev->base_addr == 2, allocate space for the device and return success1122 * (detachable devices only).1123 */1124static void baycom_probe(struct net_device *dev)1125{1126 const struct hdlcdrv_channel_params dflt_ch_params = { 1127 20, 2, 10, 40, 0 1128 };1129 struct baycom_state *bc;1130 1131 /*1132 * not a real probe! only initialize data structures1133 */1134 bc = netdev_priv(dev);1135 /*1136 * initialize the baycom_state struct1137 */1138 bc->ch_params = dflt_ch_params;1139 bc->ptt_keyed = 0;1140 1141 /*1142 * initialize the device struct1143 */1144 1145 /* Fill in the fields of the device structure */1146 bc->skb = NULL;1147 1148 dev->netdev_ops = &baycom_netdev_ops;1149 dev->header_ops = &ax25_header_ops;1150 1151 dev->type = ARPHRD_AX25; /* AF_AX25 device */1152 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;1153 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */1154 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */1155 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);1156 dev_addr_set(dev, (u8 *)&null_ax25_address);1157 dev->tx_queue_len = 16;1158 1159 /* New style flags */1160 dev->flags = 0;1161}1162 1163/* --------------------------------------------------------------------- */1164 1165/*1166 * command line settable parameters1167 */1168static char *mode[NR_PORTS] = { "", };1169static int iobase[NR_PORTS] = { 0x378, };1170 1171module_param_array(mode, charp, NULL, 0);1172MODULE_PARM_DESC(mode, "baycom operating mode");1173module_param_hw_array(iobase, int, ioport, NULL, 0);1174MODULE_PARM_DESC(iobase, "baycom io base address");1175 1176MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");1177MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");1178MODULE_LICENSE("GPL");1179 1180/* --------------------------------------------------------------------- */1181 1182static int baycom_epp_par_probe(struct pardevice *par_dev)1183{1184 struct device_driver *drv = par_dev->dev.driver;1185 int len = strlen(drv->name);1186 1187 if (strncmp(par_dev->name, drv->name, len))1188 return -ENODEV;1189 1190 return 0;1191}1192 1193static struct parport_driver baycom_epp_par_driver = {1194 .name = "bce",1195 .probe = baycom_epp_par_probe,1196};1197 1198static void __init baycom_epp_dev_setup(struct net_device *dev)1199{1200 struct baycom_state *bc = netdev_priv(dev);1201 1202 /*1203 * initialize part of the baycom_state struct1204 */1205 bc->dev = dev;1206 bc->magic = BAYCOM_MAGIC;1207 bc->cfg.fclk = 19666600;1208 bc->cfg.bps = 9600;1209 /*1210 * initialize part of the device struct1211 */1212 baycom_probe(dev);1213}1214 1215static int __init init_baycomepp(void)1216{1217 int i, found = 0, ret;1218 char set_hw = 1;1219 1220 printk(bc_drvinfo);1221 1222 ret = parport_register_driver(&baycom_epp_par_driver);1223 if (ret)1224 return ret;1225 1226 /*1227 * register net devices1228 */1229 for (i = 0; i < NR_PORTS; i++) {1230 struct net_device *dev;1231 1232 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",1233 NET_NAME_UNKNOWN, baycom_epp_dev_setup);1234 1235 if (!dev) {1236 printk(KERN_WARNING "bce%d : out of memory\n", i);1237 return found ? 0 : -ENOMEM;1238 }1239 1240 sprintf(dev->name, "bce%d", i);1241 dev->base_addr = iobase[i];1242 1243 if (!mode[i])1244 set_hw = 0;1245 if (!set_hw)1246 iobase[i] = 0;1247 1248 if (register_netdev(dev)) {1249 printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);1250 free_netdev(dev);1251 break;1252 }1253 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))1254 set_hw = 0;1255 baycom_device[i] = dev;1256 found++;1257 }1258 1259 if (found == 0) {1260 parport_unregister_driver(&baycom_epp_par_driver);1261 return -ENXIO;1262 }1263 1264 return 0;1265}1266 1267static void __exit cleanup_baycomepp(void)1268{1269 int i;1270 1271 for(i = 0; i < NR_PORTS; i++) {1272 struct net_device *dev = baycom_device[i];1273 1274 if (dev) {1275 struct baycom_state *bc = netdev_priv(dev);1276 if (bc->magic == BAYCOM_MAGIC) {1277 unregister_netdev(dev);1278 free_netdev(dev);1279 } else1280 printk(paranoia_str, "cleanup_module");1281 }1282 }1283 parport_unregister_driver(&baycom_epp_par_driver);1284}1285 1286module_init(init_baycomepp);1287module_exit(cleanup_baycomepp);1288 1289/* --------------------------------------------------------------------- */1290 1291#ifndef MODULE1292 1293/*1294 * format: baycom_epp=io,mode1295 * mode: fpga config options1296 */1297 1298static int __init baycom_epp_setup(char *str)1299{1300 static unsigned __initdata nr_dev = 0;1301 int ints[2];1302 1303 if (nr_dev >= NR_PORTS)1304 return 0;1305 str = get_options(str, 2, ints);1306 if (ints[0] < 1)1307 return 0;1308 mode[nr_dev] = str;1309 iobase[nr_dev] = ints[1];1310 nr_dev++;1311 return 1;1312}1313 1314__setup("baycom_epp=", baycom_epp_setup);1315 1316#endif /* MODULE */1317/* --------------------------------------------------------------------- */1318