1 /*****************************************************************************/
4 * baycom_epp.c -- baycom epp radio modem driver.
6 * Copyright (C) 1998-2000
7 * Thomas Sailer (sailer@ife.ee.ethz.ch)
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * Please note that the GPL allows you to use the driver, NOT the radio.
24 * In order to use the radio, you need a license from the communications
25 * authority of your country.
29 * 0.1 xx.xx.1998 Initial version by Matthias Welwarsky (dg2fef)
30 * 0.2 21.04.1998 Massive rework by Thomas Sailer
31 * Integrated FPGA EPP modem configuration routines
32 * 0.3 11.05.1998 Took FPGA config out and moved it into a separate program
33 * 0.4 26.07.1999 Adapted to new lowlevel parport driver interface
34 * 0.5 03.08.1999 adapt to Linus' new __setup/__initcall
35 * removed some pre-2.2 kernel compatibility cruft
36 * 0.6 10.08.1999 Check if parport can do SPP and is safe to access during interrupt contexts
37 * 0.7 12.02.2000 adapted to softnet driver interface
41 /*****************************************************************************/
43 #include <linux/crc-ccitt.h>
44 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/init.h>
47 #include <linux/string.h>
48 #include <linux/workqueue.h>
50 #include <linux/parport.h>
51 #include <linux/if_arp.h>
52 #include <linux/hdlcdrv.h>
53 #include <linux/baycom.h>
54 #include <linux/jiffies.h>
56 #include <asm/uaccess.h>
58 /* --------------------------------------------------------------------- */
61 #define BAYCOM_MAGIC 19730510
63 /* --------------------------------------------------------------------- */
65 static const char paranoia_str[] = KERN_ERR
66 "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
68 static const char bc_drvname[] = "baycom_epp";
69 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
70 KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
72 /* --------------------------------------------------------------------- */
76 static struct net_device *baycom_device[NR_PORTS];
78 /* --------------------------------------------------------------------- */
80 /* EPP status register */
81 #define EPP_DCDBIT 0x80
82 #define EPP_PTTBIT 0x08
84 #define EPP_NRAEF 0x02
87 #define EPP_NTAEF 0x10
88 #define EPP_NTEF EPP_PTTBIT
90 /* EPP control register */
91 #define EPP_TX_FIFO_ENABLE 0x10
92 #define EPP_RX_FIFO_ENABLE 0x08
93 #define EPP_MODEM_ENABLE 0x20
95 #define EPP_IRQ_ENABLE 0x10
98 #define LPTREG_ECONTROL 0x402
99 #define LPTREG_CONFIGB 0x401
100 #define LPTREG_CONFIGA 0x400
101 #define LPTREG_EPPDATA 0x004
102 #define LPTREG_EPPADDR 0x003
103 #define LPTREG_CONTROL 0x002
104 #define LPTREG_STATUS 0x001
105 #define LPTREG_DATA 0x000
107 /* LPT control register */
108 #define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */
109 #define LPTCTRL_WRITE 0x01
110 #define LPTCTRL_ADDRSTB 0x08
111 #define LPTCTRL_DATASTB 0x02
112 #define LPTCTRL_INTEN 0x10
114 /* LPT status register */
115 #define LPTSTAT_SHIFT_NINTR 6
116 #define LPTSTAT_WAIT 0x80
117 #define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR)
118 #define LPTSTAT_PE 0x20
119 #define LPTSTAT_DONE 0x10
120 #define LPTSTAT_NERROR 0x08
121 #define LPTSTAT_EPPTIMEOUT 0x01
123 /* LPT data register */
124 #define LPTDATA_SHIFT_TDI 0
125 #define LPTDATA_SHIFT_TMS 2
126 #define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI)
127 #define LPTDATA_TCK 0x02
128 #define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS)
129 #define LPTDATA_INITBIAS 0x80
132 /* EPP modem config/status bits */
133 #define EPP_DCDBIT 0x80
134 #define EPP_PTTBIT 0x08
135 #define EPP_RXEBIT 0x01
136 #define EPP_RXAEBIT 0x02
137 #define EPP_RXHFULL 0x04
139 #define EPP_NTHF 0x20
140 #define EPP_NTAEF 0x10
141 #define EPP_NTEF EPP_PTTBIT
143 #define EPP_TX_FIFO_ENABLE 0x10
144 #define EPP_RX_FIFO_ENABLE 0x08
145 #define EPP_MODEM_ENABLE 0x20
146 #define EPP_LEDS 0xC0
147 #define EPP_IRQ_ENABLE 0x10
149 /* Xilinx 4k JTAG instructions */
150 #define XC4K_IRLENGTH 3
151 #define XC4K_EXTEST 0
152 #define XC4K_PRELOAD 1
153 #define XC4K_CONFIGURE 5
154 #define XC4K_BYPASS 7
156 #define EPP_CONVENTIONAL 0
158 #define EPP_FPGAEXTSTATUS 2
160 #define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8)
162 /* ---------------------------------------------------------------------- */
164 * Information that need to be kept for each board.
167 struct baycom_state {
170 struct pardevice *pdev;
171 unsigned int work_running;
172 struct work_struct run_work;
174 unsigned int bitrate;
181 unsigned int extmodem;
182 unsigned int loopback;
185 struct hdlcdrv_channel_params ch_params;
188 unsigned int bitbuf, bitstream, numbits, state;
189 unsigned char *bufptr;
191 unsigned char buf[TXBUFFER_SIZE];
198 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
199 unsigned char *bufptr;
201 unsigned char buf[TXBUFFER_SIZE];
204 struct net_device_stats stats;
205 unsigned int ptt_keyed;
206 struct sk_buff *skb; /* next transmit packet */
210 unsigned long last_jiffies;
212 unsigned last_intcnt;
215 unsigned int mod_cycles;
216 unsigned int demod_cycles;
218 #endif /* BAYCOM_DEBUG */
221 /* --------------------------------------------------------------------- */
225 /* --------------------------------------------------------------------- */
227 #define PARAM_TXDELAY 1
228 #define PARAM_PERSIST 2
229 #define PARAM_SLOTTIME 3
230 #define PARAM_TXTAIL 4
231 #define PARAM_FULLDUP 5
232 #define PARAM_HARDWARE 6
233 #define PARAM_RETURN 255
235 /* --------------------------------------------------------------------- */
237 * the CRC routines are stolen from WAMPES
242 /*---------------------------------------------------------------------------*/
245 static inline void append_crc_ccitt(unsigned char *buffer, int len)
247 unsigned int crc = 0xffff;
250 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
253 *buffer++ = crc >> 8;
257 /*---------------------------------------------------------------------------*/
259 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
261 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
264 /*---------------------------------------------------------------------------*/
266 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
268 return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
271 /* ---------------------------------------------------------------------- */
273 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
275 /* --------------------------------------------------------------------- */
277 static inline void baycom_int_freq(struct baycom_state *bc)
280 unsigned long cur_jiffies = jiffies;
282 * measure the interrupt frequency
284 bc->debug_vals.cur_intcnt++;
285 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
286 bc->debug_vals.last_jiffies = cur_jiffies;
287 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
288 bc->debug_vals.cur_intcnt = 0;
289 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
290 bc->debug_vals.cur_pllcorr = 0;
292 #endif /* BAYCOM_DEBUG */
295 /* ---------------------------------------------------------------------- */
297 * eppconfig_path should be setable via /proc/sys.
300 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
302 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
304 /* eppconfig: called during ifconfig up to configure the modem */
305 static int eppconfig(struct baycom_state *bc)
309 char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
312 /* set up arguments */
313 sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
314 bc->cfg.intclk ? "int" : "ext",
315 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
316 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
317 bc->cfg.loopback ? ",loopback" : "");
318 sprintf(portarg, "%ld", bc->pdev->port->base);
319 printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
321 return call_usermodehelper(eppconfig_path, argv, envp, 1);
324 /* ---------------------------------------------------------------------- */
326 static void epp_interrupt(int irq, void *dev_id)
330 /* ---------------------------------------------------------------------- */
332 static inline void do_kiss_params(struct baycom_state *bc,
333 unsigned char *data, unsigned long len)
337 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
338 #else /* KISS_VERBOSE */
340 #endif /* KISS_VERBOSE */
346 bc->ch_params.tx_delay = data[1];
347 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
350 bc->ch_params.ppersist = data[1];
351 PKP("p persistence = %u", bc->ch_params.ppersist);
354 bc->ch_params.slottime = data[1];
355 PKP("slot time = %ums", bc->ch_params.slottime);
358 bc->ch_params.tx_tail = data[1];
359 PKP("TX tail = %ums", bc->ch_params.tx_tail);
362 bc->ch_params.fulldup = !!data[1];
363 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
371 /* --------------------------------------------------------------------- */
373 static void encode_hdlc(struct baycom_state *bc)
376 unsigned char *wp, *bp;
378 unsigned bitstream, notbitstream, bitbuf, numbit, crc;
379 unsigned char crcarr[2];
382 if (bc->hdlctx.bufcnt > 0)
388 pkt_len = skb->len-1; /* strip KISS byte */
391 crc = calc_crc_ccitt(bp, pkt_len);
393 crcarr[1] = crc >> 8;
395 bitstream = bitbuf = numbit = 0;
396 while (pkt_len > -2) {
398 bitstream |= ((unsigned int)*bp) << 8;
399 bitbuf |= ((unsigned int)*bp) << numbit;
400 notbitstream = ~bitstream;
405 for (j = 0; j < 8; j++)
406 if (unlikely(!(notbitstream & (0x1f0 << j)))) {
407 bitstream &= ~(0x100 << j);
408 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
409 ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
411 notbitstream = ~bitstream;
414 while (numbit >= 8) {
420 bitbuf |= 0x7e7e << numbit;
422 while (numbit >= 8) {
427 bc->hdlctx.bufptr = bc->hdlctx.buf;
428 bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
430 bc->stats.tx_packets++;
433 /* ---------------------------------------------------------------------- */
435 static unsigned short random_seed;
437 static inline unsigned short random_num(void)
439 random_seed = 28629 * random_seed + 157;
443 /* ---------------------------------------------------------------------- */
445 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
447 struct parport *pp = bc->pdev->port;
448 unsigned char tmp[128];
451 if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
452 bc->hdlctx.state = tx_idle;
453 if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
454 if (bc->hdlctx.bufcnt <= 0)
456 if (bc->hdlctx.bufcnt <= 0)
458 if (!bc->ch_params.fulldup) {
459 if (!(stat & EPP_DCDBIT)) {
460 bc->hdlctx.slotcnt = bc->ch_params.slottime;
463 if ((--bc->hdlctx.slotcnt) > 0)
465 bc->hdlctx.slotcnt = bc->ch_params.slottime;
466 if ((random_num() % 256) > bc->ch_params.ppersist)
470 if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
471 bc->hdlctx.state = tx_keyup;
472 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
476 switch (bc->hdlctx.state) {
478 i = min_t(int, cnt, bc->hdlctx.flags);
480 bc->hdlctx.flags -= i;
481 if (bc->hdlctx.flags <= 0)
482 bc->hdlctx.state = tx_data;
483 memset(tmp, 0x7e, sizeof(tmp));
485 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
486 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
493 if (bc->hdlctx.bufcnt <= 0) {
495 if (bc->hdlctx.bufcnt <= 0) {
496 bc->hdlctx.state = tx_tail;
497 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
501 i = min_t(int, cnt, bc->hdlctx.bufcnt);
502 bc->hdlctx.bufcnt -= i;
504 if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
506 bc->hdlctx.bufptr += i;
511 if (bc->hdlctx.bufcnt > 0) {
512 bc->hdlctx.state = tx_data;
515 i = min_t(int, cnt, bc->hdlctx.flags);
518 bc->hdlctx.flags -= i;
519 memset(tmp, 0x7e, sizeof(tmp));
521 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
522 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
529 default: /* fall through */
530 if (bc->hdlctx.calibrate <= 0)
532 i = min_t(int, cnt, bc->hdlctx.calibrate);
534 bc->hdlctx.calibrate -= i;
535 memset(tmp, 0, sizeof(tmp));
537 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
538 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
548 /* ---------------------------------------------------------------------- */
550 static void do_rxpacket(struct net_device *dev)
552 struct baycom_state *bc = netdev_priv(dev);
557 if (bc->hdlcrx.bufcnt < 4)
559 if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
561 pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
562 if (!(skb = dev_alloc_skb(pktlen))) {
563 printk("%s: memory squeeze, dropping packet\n", dev->name);
564 bc->stats.rx_dropped++;
567 cp = skb_put(skb, pktlen);
568 *cp++ = 0; /* KISS kludge */
569 memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
570 skb->protocol = ax25_type_trans(skb, dev);
572 dev->last_rx = jiffies;
573 bc->stats.rx_packets++;
576 static int receive(struct net_device *dev, int cnt)
578 struct baycom_state *bc = netdev_priv(dev);
579 struct parport *pp = bc->pdev->port;
580 unsigned int bitbuf, notbitstream, bitstream, numbits, state;
581 unsigned char tmp[128];
586 numbits = bc->hdlcrx.numbits;
587 state = bc->hdlcrx.state;
588 bitstream = bc->hdlcrx.bitstream;
589 bitbuf = bc->hdlcrx.bitbuf;
591 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
593 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
598 for (; cnt2 > 0; cnt2--, cp++) {
600 bitstream |= (*cp) << 8;
602 bitbuf |= (*cp) << 8;
604 notbitstream = ~bitstream;
605 for (j = 0; j < 8; j++) {
608 if (unlikely(!(notbitstream & (0x0fc << j)))) {
611 if (!(notbitstream & (0x1fc << j)))
614 /* not flag received */
615 else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
618 bc->hdlcrx.bufcnt = 0;
619 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
626 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
628 bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
631 while (state && numbits >= 8) {
632 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
635 *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
642 bc->hdlcrx.numbits = numbits;
643 bc->hdlcrx.state = state;
644 bc->hdlcrx.bitstream = bitstream;
645 bc->hdlcrx.bitbuf = bitbuf;
649 /* --------------------------------------------------------------------- */
660 #endif /* __i386__ */
662 static void epp_bh(struct net_device *dev)
664 struct baycom_state *bc;
667 unsigned char tmp[2];
668 unsigned int time1 = 0, time2 = 0, time3 = 0;
671 bc = netdev_priv(dev);
672 if (!bc->work_running)
677 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
680 bc->debug_vals.last_pllcorr = stat;
682 if (bc->modem == EPP_FPGAEXTSTATUS) {
683 /* get input count */
684 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
685 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
687 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
689 cnt = tmp[0] | (tmp[1] << 8);
691 /* get output count */
692 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
693 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
695 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
697 cnt2 = tmp[0] | (tmp[1] << 8);
698 cnt2 = 16384 - (cnt2 & 0x7fff);
699 /* return to normal */
700 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
701 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
703 if (transmit(bc, cnt2, stat))
706 if (receive(dev, cnt))
708 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
713 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
730 if (transmit(bc, cnt, stat))
734 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
735 switch (stat & (EPP_NRAEF|EPP_NRHF)) {
748 if (receive(dev, cnt))
750 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
754 if (bc->bitrate < 50000)
756 else if (bc->bitrate < 100000)
758 while (cnt > 0 && stat & EPP_NREF) {
762 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
768 bc->debug_vals.mod_cycles = time2 - time1;
769 bc->debug_vals.demod_cycles = time3 - time2;
770 #endif /* BAYCOM_DEBUG */
771 schedule_delayed_work(&bc->run_work, 1);
773 netif_wake_queue(dev);
776 printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
779 /* ---------------------------------------------------------------------- */
781 * ===================== network driver interface =========================
784 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
786 struct baycom_state *bc = netdev_priv(dev);
788 if (skb->data[0] != 0) {
789 do_kiss_params(bc, skb->data, skb->len);
795 /* strip KISS byte */
796 if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
800 netif_stop_queue(dev);
805 /* --------------------------------------------------------------------- */
807 static int baycom_set_mac_address(struct net_device *dev, void *addr)
809 struct sockaddr *sa = (struct sockaddr *)addr;
811 /* addr is an AX.25 shifted ASCII mac address */
812 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
816 /* --------------------------------------------------------------------- */
818 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
820 struct baycom_state *bc = netdev_priv(dev);
823 * Get the current statistics. This may be called with the
824 * card open or closed.
829 /* --------------------------------------------------------------------- */
831 static void epp_wakeup(void *handle)
833 struct net_device *dev = (struct net_device *)handle;
834 struct baycom_state *bc = netdev_priv(dev);
836 printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
837 if (!parport_claim(bc->pdev))
838 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
841 /* --------------------------------------------------------------------- */
844 * Open/initialize the board. This is called (in the current kernel)
845 * sometime after booting when the 'ifconfig' program is run.
847 * This routine should set everything up anew at each open, even
848 * registers that "should" only need to be set once at boot, so that
849 * there is non-reboot way to recover if something goes wrong.
852 static int epp_open(struct net_device *dev)
854 struct baycom_state *bc = netdev_priv(dev);
855 struct parport *pp = parport_find_base(dev->base_addr);
857 unsigned char tmp[128];
859 unsigned long tstart;
862 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
867 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
868 parport_put_port(pp);
872 if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
873 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
874 bc_drvname, pp->base);
875 parport_put_port(pp);
878 memset(&bc->modem, 0, sizeof(bc->modem));
879 bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
880 epp_interrupt, PARPORT_DEV_EXCL, dev);
881 parport_put_port(pp);
883 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
886 if (parport_claim(bc->pdev)) {
887 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
888 parport_unregister_device(bc->pdev);
891 dev->irq = /*pp->irq*/ 0;
892 INIT_WORK(&bc->run_work, (void *)(void *)epp_bh, dev);
893 bc->work_running = 1;
894 bc->modem = EPP_CONVENTIONAL;
896 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
898 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
899 parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
900 /* reset the modem */
902 tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
903 if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
905 /* autoprobe baud rate */
908 while (time_before(jiffies, tstart + HZ/3)) {
909 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
911 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
915 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
917 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
921 for (j = 0; j < 256; j++) {
922 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
924 if (!(stat & EPP_NREF))
926 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
930 tstart = jiffies - tstart;
931 bc->bitrate = i * (8 * HZ) / tstart;
933 i = bc->bitrate >> 3;
934 while (j < 7 && i > 150) {
938 printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n",
939 bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
940 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
941 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
944 * initialise hdlc variables
946 bc->hdlcrx.state = 0;
947 bc->hdlcrx.numbits = 0;
948 bc->hdlctx.state = tx_idle;
949 bc->hdlctx.bufcnt = 0;
950 bc->hdlctx.slotcnt = bc->ch_params.slottime;
951 bc->hdlctx.calibrate = 0;
952 /* start the bottom half stuff */
953 schedule_delayed_work(&bc->run_work, 1);
954 netif_start_queue(dev);
958 printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
959 parport_write_control(pp, 0); /* reset the adapter */
960 parport_release(bc->pdev);
961 parport_unregister_device(bc->pdev);
965 /* --------------------------------------------------------------------- */
967 static int epp_close(struct net_device *dev)
969 struct baycom_state *bc = netdev_priv(dev);
970 struct parport *pp = bc->pdev->port;
971 unsigned char tmp[1];
973 bc->work_running = 0;
974 flush_scheduled_work();
975 bc->stat = EPP_DCDBIT;
977 pp->ops->epp_write_addr(pp, tmp, 1, 0);
978 parport_write_control(pp, 0); /* reset the adapter */
979 parport_release(bc->pdev);
980 parport_unregister_device(bc->pdev);
982 dev_kfree_skb(bc->skb);
984 printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
985 bc_drvname, dev->base_addr, dev->irq);
989 /* --------------------------------------------------------------------- */
991 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
995 if (strstr(modestr,"intclk"))
997 if (strstr(modestr,"extclk"))
999 if (strstr(modestr,"intmodem"))
1000 bc->cfg.extmodem = 0;
1001 if (strstr(modestr,"extmodem"))
1002 bc->cfg.extmodem = 1;
1003 if (strstr(modestr,"noloopback"))
1004 bc->cfg.loopback = 0;
1005 if (strstr(modestr,"loopback"))
1006 bc->cfg.loopback = 1;
1007 if ((cp = strstr(modestr,"fclk="))) {
1008 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1009 if (bc->cfg.fclk < 1000000)
1010 bc->cfg.fclk = 1000000;
1011 if (bc->cfg.fclk > 25000000)
1012 bc->cfg.fclk = 25000000;
1014 if ((cp = strstr(modestr,"bps="))) {
1015 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1016 if (bc->cfg.bps < 1000)
1018 if (bc->cfg.bps > 1500000)
1019 bc->cfg.bps = 1500000;
1024 /* --------------------------------------------------------------------- */
1026 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1028 struct baycom_state *bc = netdev_priv(dev);
1029 struct hdlcdrv_ioctl hi;
1031 if (cmd != SIOCDEVPRIVATE)
1032 return -ENOIOCTLCMD;
1034 if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1038 return -ENOIOCTLCMD;
1040 case HDLCDRVCTL_GETCHANNELPAR:
1041 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1042 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1043 hi.data.cp.slottime = bc->ch_params.slottime;
1044 hi.data.cp.ppersist = bc->ch_params.ppersist;
1045 hi.data.cp.fulldup = bc->ch_params.fulldup;
1048 case HDLCDRVCTL_SETCHANNELPAR:
1049 if (!capable(CAP_NET_ADMIN))
1051 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1052 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1053 bc->ch_params.slottime = hi.data.cp.slottime;
1054 bc->ch_params.ppersist = hi.data.cp.ppersist;
1055 bc->ch_params.fulldup = hi.data.cp.fulldup;
1056 bc->hdlctx.slotcnt = 1;
1059 case HDLCDRVCTL_GETMODEMPAR:
1060 hi.data.mp.iobase = dev->base_addr;
1061 hi.data.mp.irq = dev->irq;
1062 hi.data.mp.dma = dev->dma;
1063 hi.data.mp.dma2 = 0;
1064 hi.data.mp.seriobase = 0;
1065 hi.data.mp.pariobase = 0;
1066 hi.data.mp.midiiobase = 0;
1069 case HDLCDRVCTL_SETMODEMPAR:
1070 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1072 dev->base_addr = hi.data.mp.iobase;
1073 dev->irq = /*hi.data.mp.irq*/0;
1074 dev->dma = /*hi.data.mp.dma*/0;
1077 case HDLCDRVCTL_GETSTAT:
1078 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1079 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1080 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1081 hi.data.cs.tx_packets = bc->stats.tx_packets;
1082 hi.data.cs.tx_errors = bc->stats.tx_errors;
1083 hi.data.cs.rx_packets = bc->stats.rx_packets;
1084 hi.data.cs.rx_errors = bc->stats.rx_errors;
1087 case HDLCDRVCTL_OLDGETSTAT:
1088 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1089 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1090 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1093 case HDLCDRVCTL_CALIBRATE:
1094 if (!capable(CAP_SYS_RAWIO))
1096 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1099 case HDLCDRVCTL_DRIVERNAME:
1100 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1103 case HDLCDRVCTL_GETMODE:
1104 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1105 bc->cfg.intclk ? "int" : "ext",
1106 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1107 bc->cfg.loopback ? ",loopback" : "");
1110 case HDLCDRVCTL_SETMODE:
1111 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1113 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1114 return baycom_setmode(bc, hi.data.modename);
1116 case HDLCDRVCTL_MODELIST:
1117 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1118 sizeof(hi.data.modename));
1121 case HDLCDRVCTL_MODEMPARMASK:
1122 return HDLCDRV_PARMASK_IOBASE;
1125 if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1130 /* --------------------------------------------------------------------- */
1133 * Check for a network adaptor of this type, and return '0' if one exists.
1134 * If dev->base_addr == 0, probe all likely locations.
1135 * If dev->base_addr == 1, always return failure.
1136 * If dev->base_addr == 2, allocate space for the device and return success
1137 * (detachable devices only).
1139 static void baycom_probe(struct net_device *dev)
1141 static char ax25_bcast[AX25_ADDR_LEN] = {
1142 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1
1144 static char ax25_nocall[AX25_ADDR_LEN] = {
1145 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1
1147 const struct hdlcdrv_channel_params dflt_ch_params = {
1150 struct baycom_state *bc;
1153 * not a real probe! only initialize data structures
1155 bc = netdev_priv(dev);
1157 * initialize the baycom_state struct
1159 bc->ch_params = dflt_ch_params;
1163 * initialize the device struct
1165 dev->open = epp_open;
1166 dev->stop = epp_close;
1167 dev->do_ioctl = baycom_ioctl;
1168 dev->hard_start_xmit = baycom_send_packet;
1169 dev->get_stats = baycom_get_stats;
1171 /* Fill in the fields of the device structure */
1174 dev->hard_header = ax25_hard_header;
1175 dev->rebuild_header = ax25_rebuild_header;
1176 dev->set_mac_address = baycom_set_mac_address;
1178 dev->type = ARPHRD_AX25; /* AF_AX25 device */
1179 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1180 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
1181 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
1182 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
1183 memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
1184 dev->tx_queue_len = 16;
1186 /* New style flags */
1190 /* --------------------------------------------------------------------- */
1193 * command line settable parameters
1195 static const char *mode[NR_PORTS] = { "", };
1196 static int iobase[NR_PORTS] = { 0x378, };
1198 module_param_array(mode, charp, NULL, 0);
1199 MODULE_PARM_DESC(mode, "baycom operating mode");
1200 module_param_array(iobase, int, NULL, 0);
1201 MODULE_PARM_DESC(iobase, "baycom io base address");
1203 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1204 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1205 MODULE_LICENSE("GPL");
1207 /* --------------------------------------------------------------------- */
1209 static void __init baycom_epp_dev_setup(struct net_device *dev)
1211 struct baycom_state *bc = netdev_priv(dev);
1214 * initialize part of the baycom_state struct
1216 bc->magic = BAYCOM_MAGIC;
1217 bc->cfg.fclk = 19666600;
1220 * initialize part of the device struct
1225 static int __init init_baycomepp(void)
1232 * register net devices
1234 for (i = 0; i < NR_PORTS; i++) {
1235 struct net_device *dev;
1237 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1238 baycom_epp_dev_setup);
1241 printk(KERN_WARNING "bce%d : out of memory\n", i);
1242 return found ? 0 : -ENOMEM;
1245 sprintf(dev->name, "bce%d", i);
1246 dev->base_addr = iobase[i];
1253 if (register_netdev(dev)) {
1254 printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1258 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1260 baycom_device[i] = dev;
1264 return found ? 0 : -ENXIO;
1267 static void __exit cleanup_baycomepp(void)
1271 for(i = 0; i < NR_PORTS; i++) {
1272 struct net_device *dev = baycom_device[i];
1275 struct baycom_state *bc = netdev_priv(dev);
1276 if (bc->magic == BAYCOM_MAGIC) {
1277 unregister_netdev(dev);
1280 printk(paranoia_str, "cleanup_module");
1285 module_init(init_baycomepp);
1286 module_exit(cleanup_baycomepp);
1288 /* --------------------------------------------------------------------- */
1293 * format: baycom_epp=io,mode
1294 * mode: fpga config options
1297 static int __init baycom_epp_setup(char *str)
1299 static unsigned __initdata nr_dev = 0;
1302 if (nr_dev >= NR_PORTS)
1304 str = get_options(str, 2, ints);
1308 iobase[nr_dev] = ints[1];
1313 __setup("baycom_epp=", baycom_epp_setup);
1316 /* --------------------------------------------------------------------- */