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/sched.h>
48 #include <linux/string.h>
49 #include <linux/workqueue.h>
51 #include <linux/parport.h>
52 #include <linux/if_arp.h>
53 #include <linux/hdlcdrv.h>
54 #include <linux/baycom.h>
55 #include <linux/jiffies.h>
56 #include <linux/random.h>
58 #include <asm/uaccess.h>
60 /* --------------------------------------------------------------------- */
63 #define BAYCOM_MAGIC 19730510
65 /* --------------------------------------------------------------------- */
67 static const char paranoia_str[] = KERN_ERR
68 "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
70 static const char bc_drvname[] = "baycom_epp";
71 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
72 "baycom_epp: version 0.7\n";
74 /* --------------------------------------------------------------------- */
78 static struct net_device *baycom_device[NR_PORTS];
80 /* --------------------------------------------------------------------- */
82 /* EPP status register */
83 #define EPP_DCDBIT 0x80
84 #define EPP_PTTBIT 0x08
86 #define EPP_NRAEF 0x02
89 #define EPP_NTAEF 0x10
90 #define EPP_NTEF EPP_PTTBIT
92 /* EPP control register */
93 #define EPP_TX_FIFO_ENABLE 0x10
94 #define EPP_RX_FIFO_ENABLE 0x08
95 #define EPP_MODEM_ENABLE 0x20
97 #define EPP_IRQ_ENABLE 0x10
100 #define LPTREG_ECONTROL 0x402
101 #define LPTREG_CONFIGB 0x401
102 #define LPTREG_CONFIGA 0x400
103 #define LPTREG_EPPDATA 0x004
104 #define LPTREG_EPPADDR 0x003
105 #define LPTREG_CONTROL 0x002
106 #define LPTREG_STATUS 0x001
107 #define LPTREG_DATA 0x000
109 /* LPT control register */
110 #define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */
111 #define LPTCTRL_WRITE 0x01
112 #define LPTCTRL_ADDRSTB 0x08
113 #define LPTCTRL_DATASTB 0x02
114 #define LPTCTRL_INTEN 0x10
116 /* LPT status register */
117 #define LPTSTAT_SHIFT_NINTR 6
118 #define LPTSTAT_WAIT 0x80
119 #define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR)
120 #define LPTSTAT_PE 0x20
121 #define LPTSTAT_DONE 0x10
122 #define LPTSTAT_NERROR 0x08
123 #define LPTSTAT_EPPTIMEOUT 0x01
125 /* LPT data register */
126 #define LPTDATA_SHIFT_TDI 0
127 #define LPTDATA_SHIFT_TMS 2
128 #define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI)
129 #define LPTDATA_TCK 0x02
130 #define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS)
131 #define LPTDATA_INITBIAS 0x80
134 /* EPP modem config/status bits */
135 #define EPP_DCDBIT 0x80
136 #define EPP_PTTBIT 0x08
137 #define EPP_RXEBIT 0x01
138 #define EPP_RXAEBIT 0x02
139 #define EPP_RXHFULL 0x04
141 #define EPP_NTHF 0x20
142 #define EPP_NTAEF 0x10
143 #define EPP_NTEF EPP_PTTBIT
145 #define EPP_TX_FIFO_ENABLE 0x10
146 #define EPP_RX_FIFO_ENABLE 0x08
147 #define EPP_MODEM_ENABLE 0x20
148 #define EPP_LEDS 0xC0
149 #define EPP_IRQ_ENABLE 0x10
151 /* Xilinx 4k JTAG instructions */
152 #define XC4K_IRLENGTH 3
153 #define XC4K_EXTEST 0
154 #define XC4K_PRELOAD 1
155 #define XC4K_CONFIGURE 5
156 #define XC4K_BYPASS 7
158 #define EPP_CONVENTIONAL 0
160 #define EPP_FPGAEXTSTATUS 2
162 #define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8)
164 /* ---------------------------------------------------------------------- */
166 * Information that need to be kept for each board.
169 struct baycom_state {
172 struct pardevice *pdev;
173 struct net_device *dev;
174 unsigned int work_running;
175 struct delayed_work run_work;
177 unsigned int bitrate;
184 unsigned int extmodem;
185 unsigned int loopback;
188 struct hdlcdrv_channel_params ch_params;
191 unsigned int bitbuf, bitstream, numbits, state;
192 unsigned char *bufptr;
194 unsigned char buf[TXBUFFER_SIZE];
201 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
202 unsigned char *bufptr;
204 unsigned char buf[TXBUFFER_SIZE];
207 unsigned int ptt_keyed;
208 struct sk_buff *skb; /* next transmit packet */
212 unsigned long last_jiffies;
214 unsigned last_intcnt;
217 unsigned int mod_cycles;
218 unsigned int demod_cycles;
220 #endif /* BAYCOM_DEBUG */
223 /* --------------------------------------------------------------------- */
227 /* --------------------------------------------------------------------- */
229 #define PARAM_TXDELAY 1
230 #define PARAM_PERSIST 2
231 #define PARAM_SLOTTIME 3
232 #define PARAM_TXTAIL 4
233 #define PARAM_FULLDUP 5
234 #define PARAM_HARDWARE 6
235 #define PARAM_RETURN 255
237 /* --------------------------------------------------------------------- */
239 * the CRC routines are stolen from WAMPES
244 /*---------------------------------------------------------------------------*/
247 static inline void append_crc_ccitt(unsigned char *buffer, int len)
249 unsigned int crc = 0xffff;
252 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
255 *buffer++ = crc >> 8;
259 /*---------------------------------------------------------------------------*/
261 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
263 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
266 /*---------------------------------------------------------------------------*/
268 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
270 return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
273 /* ---------------------------------------------------------------------- */
275 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
277 /* --------------------------------------------------------------------- */
279 static inline void baycom_int_freq(struct baycom_state *bc)
282 unsigned long cur_jiffies = jiffies;
284 * measure the interrupt frequency
286 bc->debug_vals.cur_intcnt++;
287 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
288 bc->debug_vals.last_jiffies = cur_jiffies;
289 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
290 bc->debug_vals.cur_intcnt = 0;
291 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
292 bc->debug_vals.cur_pllcorr = 0;
294 #endif /* BAYCOM_DEBUG */
297 /* ---------------------------------------------------------------------- */
299 * eppconfig_path should be setable via /proc/sys.
302 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
304 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
306 /* eppconfig: called during ifconfig up to configure the modem */
307 static int eppconfig(struct baycom_state *bc)
311 char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
314 /* set up arguments */
315 sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
316 bc->cfg.intclk ? "int" : "ext",
317 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
318 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
319 bc->cfg.loopback ? ",loopback" : "");
320 sprintf(portarg, "%ld", bc->pdev->port->base);
321 printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
323 return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC);
326 /* ---------------------------------------------------------------------- */
328 static inline void do_kiss_params(struct baycom_state *bc,
329 unsigned char *data, unsigned long len)
333 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
334 #else /* KISS_VERBOSE */
336 #endif /* KISS_VERBOSE */
342 bc->ch_params.tx_delay = data[1];
343 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
346 bc->ch_params.ppersist = data[1];
347 PKP("p persistence = %u", bc->ch_params.ppersist);
350 bc->ch_params.slottime = data[1];
351 PKP("slot time = %ums", bc->ch_params.slottime);
354 bc->ch_params.tx_tail = data[1];
355 PKP("TX tail = %ums", bc->ch_params.tx_tail);
358 bc->ch_params.fulldup = !!data[1];
359 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
367 /* --------------------------------------------------------------------- */
369 static void encode_hdlc(struct baycom_state *bc)
372 unsigned char *wp, *bp;
374 unsigned bitstream, notbitstream, bitbuf, numbit, crc;
375 unsigned char crcarr[2];
378 if (bc->hdlctx.bufcnt > 0)
384 pkt_len = skb->len-1; /* strip KISS byte */
387 crc = calc_crc_ccitt(bp, pkt_len);
389 crcarr[1] = crc >> 8;
391 bitstream = bitbuf = numbit = 0;
392 while (pkt_len > -2) {
394 bitstream |= ((unsigned int)*bp) << 8;
395 bitbuf |= ((unsigned int)*bp) << numbit;
396 notbitstream = ~bitstream;
401 for (j = 0; j < 8; j++)
402 if (unlikely(!(notbitstream & (0x1f0 << j)))) {
403 bitstream &= ~(0x100 << j);
404 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
405 ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
407 notbitstream = ~bitstream;
410 while (numbit >= 8) {
416 bitbuf |= 0x7e7e << numbit;
418 while (numbit >= 8) {
423 bc->hdlctx.bufptr = bc->hdlctx.buf;
424 bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
426 bc->dev->stats.tx_packets++;
429 /* ---------------------------------------------------------------------- */
431 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
433 struct parport *pp = bc->pdev->port;
434 unsigned char tmp[128];
437 if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
438 bc->hdlctx.state = tx_idle;
439 if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
440 if (bc->hdlctx.bufcnt <= 0)
442 if (bc->hdlctx.bufcnt <= 0)
444 if (!bc->ch_params.fulldup) {
445 if (!(stat & EPP_DCDBIT)) {
446 bc->hdlctx.slotcnt = bc->ch_params.slottime;
449 if ((--bc->hdlctx.slotcnt) > 0)
451 bc->hdlctx.slotcnt = bc->ch_params.slottime;
452 if ((random32() % 256) > bc->ch_params.ppersist)
456 if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
457 bc->hdlctx.state = tx_keyup;
458 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
462 switch (bc->hdlctx.state) {
464 i = min_t(int, cnt, bc->hdlctx.flags);
466 bc->hdlctx.flags -= i;
467 if (bc->hdlctx.flags <= 0)
468 bc->hdlctx.state = tx_data;
469 memset(tmp, 0x7e, sizeof(tmp));
471 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
472 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
479 if (bc->hdlctx.bufcnt <= 0) {
481 if (bc->hdlctx.bufcnt <= 0) {
482 bc->hdlctx.state = tx_tail;
483 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
487 i = min_t(int, cnt, bc->hdlctx.bufcnt);
488 bc->hdlctx.bufcnt -= i;
490 if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
492 bc->hdlctx.bufptr += i;
497 if (bc->hdlctx.bufcnt > 0) {
498 bc->hdlctx.state = tx_data;
501 i = min_t(int, cnt, bc->hdlctx.flags);
504 bc->hdlctx.flags -= i;
505 memset(tmp, 0x7e, sizeof(tmp));
507 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
508 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
515 default: /* fall through */
516 if (bc->hdlctx.calibrate <= 0)
518 i = min_t(int, cnt, bc->hdlctx.calibrate);
520 bc->hdlctx.calibrate -= i;
521 memset(tmp, 0, sizeof(tmp));
523 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
524 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
534 /* ---------------------------------------------------------------------- */
536 static void do_rxpacket(struct net_device *dev)
538 struct baycom_state *bc = netdev_priv(dev);
543 if (bc->hdlcrx.bufcnt < 4)
545 if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
547 pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
548 if (!(skb = dev_alloc_skb(pktlen))) {
549 printk("%s: memory squeeze, dropping packet\n", dev->name);
550 dev->stats.rx_dropped++;
553 cp = skb_put(skb, pktlen);
554 *cp++ = 0; /* KISS kludge */
555 memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
556 skb->protocol = ax25_type_trans(skb, dev);
558 dev->stats.rx_packets++;
561 static int receive(struct net_device *dev, int cnt)
563 struct baycom_state *bc = netdev_priv(dev);
564 struct parport *pp = bc->pdev->port;
565 unsigned int bitbuf, notbitstream, bitstream, numbits, state;
566 unsigned char tmp[128];
571 numbits = bc->hdlcrx.numbits;
572 state = bc->hdlcrx.state;
573 bitstream = bc->hdlcrx.bitstream;
574 bitbuf = bc->hdlcrx.bitbuf;
576 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
578 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
583 for (; cnt2 > 0; cnt2--, cp++) {
585 bitstream |= (*cp) << 8;
587 bitbuf |= (*cp) << 8;
589 notbitstream = ~bitstream;
590 for (j = 0; j < 8; j++) {
593 if (unlikely(!(notbitstream & (0x0fc << j)))) {
596 if (!(notbitstream & (0x1fc << j)))
600 else if ((bitstream & (0x1fe << j)) == (0x0fc << j)) {
603 bc->hdlcrx.bufcnt = 0;
604 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
611 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
613 bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
616 while (state && numbits >= 8) {
617 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
620 *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
627 bc->hdlcrx.numbits = numbits;
628 bc->hdlcrx.state = state;
629 bc->hdlcrx.bitstream = bitstream;
630 bc->hdlcrx.bitbuf = bitbuf;
634 /* --------------------------------------------------------------------- */
645 #endif /* __i386__ */
647 static void epp_bh(struct work_struct *work)
649 struct net_device *dev;
650 struct baycom_state *bc;
653 unsigned char tmp[2];
654 unsigned int time1 = 0, time2 = 0, time3 = 0;
657 bc = container_of(work, struct baycom_state, run_work.work);
659 if (!bc->work_running)
664 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
667 bc->debug_vals.last_pllcorr = stat;
669 if (bc->modem == EPP_FPGAEXTSTATUS) {
670 /* get input count */
671 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
672 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
674 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
676 cnt = tmp[0] | (tmp[1] << 8);
678 /* get output count */
679 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
680 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
682 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
684 cnt2 = tmp[0] | (tmp[1] << 8);
685 cnt2 = 16384 - (cnt2 & 0x7fff);
686 /* return to normal */
687 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
688 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
690 if (transmit(bc, cnt2, stat))
693 if (receive(dev, cnt))
695 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
700 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
717 if (transmit(bc, cnt, stat))
721 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
722 switch (stat & (EPP_NRAEF|EPP_NRHF)) {
735 if (receive(dev, cnt))
737 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
741 if (bc->bitrate < 50000)
743 else if (bc->bitrate < 100000)
745 while (cnt > 0 && stat & EPP_NREF) {
749 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
755 bc->debug_vals.mod_cycles = time2 - time1;
756 bc->debug_vals.demod_cycles = time3 - time2;
757 #endif /* BAYCOM_DEBUG */
758 schedule_delayed_work(&bc->run_work, 1);
760 netif_wake_queue(dev);
763 printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
766 /* ---------------------------------------------------------------------- */
768 * ===================== network driver interface =========================
771 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
773 struct baycom_state *bc = netdev_priv(dev);
775 if (skb->data[0] != 0) {
776 do_kiss_params(bc, skb->data, skb->len);
781 return NETDEV_TX_LOCKED;
782 /* strip KISS byte */
783 if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
787 netif_stop_queue(dev);
792 /* --------------------------------------------------------------------- */
794 static int baycom_set_mac_address(struct net_device *dev, void *addr)
796 struct sockaddr *sa = (struct sockaddr *)addr;
798 /* addr is an AX.25 shifted ASCII mac address */
799 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
803 /* --------------------------------------------------------------------- */
805 static void epp_wakeup(void *handle)
807 struct net_device *dev = (struct net_device *)handle;
808 struct baycom_state *bc = netdev_priv(dev);
810 printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
811 if (!parport_claim(bc->pdev))
812 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
815 /* --------------------------------------------------------------------- */
818 * Open/initialize the board. This is called (in the current kernel)
819 * sometime after booting when the 'ifconfig' program is run.
821 * This routine should set everything up anew at each open, even
822 * registers that "should" only need to be set once at boot, so that
823 * there is non-reboot way to recover if something goes wrong.
826 static int epp_open(struct net_device *dev)
828 struct baycom_state *bc = netdev_priv(dev);
829 struct parport *pp = parport_find_base(dev->base_addr);
831 unsigned char tmp[128];
833 unsigned long tstart;
836 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
841 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
842 parport_put_port(pp);
846 if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
847 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
848 bc_drvname, pp->base);
849 parport_put_port(pp);
852 memset(&bc->modem, 0, sizeof(bc->modem));
853 bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
854 NULL, PARPORT_DEV_EXCL, dev);
855 parport_put_port(pp);
857 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
860 if (parport_claim(bc->pdev)) {
861 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
862 parport_unregister_device(bc->pdev);
865 dev->irq = /*pp->irq*/ 0;
866 INIT_DELAYED_WORK(&bc->run_work, epp_bh);
867 bc->work_running = 1;
868 bc->modem = EPP_CONVENTIONAL;
870 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
872 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
873 parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
874 /* reset the modem */
876 tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
877 if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
879 /* autoprobe baud rate */
882 while (time_before(jiffies, tstart + HZ/3)) {
883 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
885 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
889 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
891 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
895 for (j = 0; j < 256; j++) {
896 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
898 if (!(stat & EPP_NREF))
900 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
904 tstart = jiffies - tstart;
905 bc->bitrate = i * (8 * HZ) / tstart;
907 i = bc->bitrate >> 3;
908 while (j < 7 && i > 150) {
912 printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n",
913 bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
914 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
915 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
918 * initialise hdlc variables
920 bc->hdlcrx.state = 0;
921 bc->hdlcrx.numbits = 0;
922 bc->hdlctx.state = tx_idle;
923 bc->hdlctx.bufcnt = 0;
924 bc->hdlctx.slotcnt = bc->ch_params.slottime;
925 bc->hdlctx.calibrate = 0;
926 /* start the bottom half stuff */
927 schedule_delayed_work(&bc->run_work, 1);
928 netif_start_queue(dev);
932 printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
933 parport_write_control(pp, 0); /* reset the adapter */
934 parport_release(bc->pdev);
935 parport_unregister_device(bc->pdev);
939 /* --------------------------------------------------------------------- */
941 static int epp_close(struct net_device *dev)
943 struct baycom_state *bc = netdev_priv(dev);
944 struct parport *pp = bc->pdev->port;
945 unsigned char tmp[1];
947 bc->work_running = 0;
948 cancel_delayed_work_sync(&bc->run_work);
949 bc->stat = EPP_DCDBIT;
951 pp->ops->epp_write_addr(pp, tmp, 1, 0);
952 parport_write_control(pp, 0); /* reset the adapter */
953 parport_release(bc->pdev);
954 parport_unregister_device(bc->pdev);
956 dev_kfree_skb(bc->skb);
958 printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
959 bc_drvname, dev->base_addr, dev->irq);
963 /* --------------------------------------------------------------------- */
965 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
969 if (strstr(modestr,"intclk"))
971 if (strstr(modestr,"extclk"))
973 if (strstr(modestr,"intmodem"))
974 bc->cfg.extmodem = 0;
975 if (strstr(modestr,"extmodem"))
976 bc->cfg.extmodem = 1;
977 if (strstr(modestr,"noloopback"))
978 bc->cfg.loopback = 0;
979 if (strstr(modestr,"loopback"))
980 bc->cfg.loopback = 1;
981 if ((cp = strstr(modestr,"fclk="))) {
982 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
983 if (bc->cfg.fclk < 1000000)
984 bc->cfg.fclk = 1000000;
985 if (bc->cfg.fclk > 25000000)
986 bc->cfg.fclk = 25000000;
988 if ((cp = strstr(modestr,"bps="))) {
989 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
990 if (bc->cfg.bps < 1000)
992 if (bc->cfg.bps > 1500000)
993 bc->cfg.bps = 1500000;
998 /* --------------------------------------------------------------------- */
1000 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1002 struct baycom_state *bc = netdev_priv(dev);
1003 struct hdlcdrv_ioctl hi;
1005 if (cmd != SIOCDEVPRIVATE)
1006 return -ENOIOCTLCMD;
1008 if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1012 return -ENOIOCTLCMD;
1014 case HDLCDRVCTL_GETCHANNELPAR:
1015 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1016 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1017 hi.data.cp.slottime = bc->ch_params.slottime;
1018 hi.data.cp.ppersist = bc->ch_params.ppersist;
1019 hi.data.cp.fulldup = bc->ch_params.fulldup;
1022 case HDLCDRVCTL_SETCHANNELPAR:
1023 if (!capable(CAP_NET_ADMIN))
1025 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1026 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1027 bc->ch_params.slottime = hi.data.cp.slottime;
1028 bc->ch_params.ppersist = hi.data.cp.ppersist;
1029 bc->ch_params.fulldup = hi.data.cp.fulldup;
1030 bc->hdlctx.slotcnt = 1;
1033 case HDLCDRVCTL_GETMODEMPAR:
1034 hi.data.mp.iobase = dev->base_addr;
1035 hi.data.mp.irq = dev->irq;
1036 hi.data.mp.dma = dev->dma;
1037 hi.data.mp.dma2 = 0;
1038 hi.data.mp.seriobase = 0;
1039 hi.data.mp.pariobase = 0;
1040 hi.data.mp.midiiobase = 0;
1043 case HDLCDRVCTL_SETMODEMPAR:
1044 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1046 dev->base_addr = hi.data.mp.iobase;
1047 dev->irq = /*hi.data.mp.irq*/0;
1048 dev->dma = /*hi.data.mp.dma*/0;
1051 case HDLCDRVCTL_GETSTAT:
1052 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1053 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1054 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1055 hi.data.cs.tx_packets = dev->stats.tx_packets;
1056 hi.data.cs.tx_errors = dev->stats.tx_errors;
1057 hi.data.cs.rx_packets = dev->stats.rx_packets;
1058 hi.data.cs.rx_errors = dev->stats.rx_errors;
1061 case HDLCDRVCTL_OLDGETSTAT:
1062 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1063 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1064 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1067 case HDLCDRVCTL_CALIBRATE:
1068 if (!capable(CAP_SYS_RAWIO))
1070 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1073 case HDLCDRVCTL_DRIVERNAME:
1074 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1077 case HDLCDRVCTL_GETMODE:
1078 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1079 bc->cfg.intclk ? "int" : "ext",
1080 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1081 bc->cfg.loopback ? ",loopback" : "");
1084 case HDLCDRVCTL_SETMODE:
1085 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1087 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1088 return baycom_setmode(bc, hi.data.modename);
1090 case HDLCDRVCTL_MODELIST:
1091 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1092 sizeof(hi.data.modename));
1095 case HDLCDRVCTL_MODEMPARMASK:
1096 return HDLCDRV_PARMASK_IOBASE;
1099 if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1104 /* --------------------------------------------------------------------- */
1106 static const struct net_device_ops baycom_netdev_ops = {
1107 .ndo_open = epp_open,
1108 .ndo_stop = epp_close,
1109 .ndo_do_ioctl = baycom_ioctl,
1110 .ndo_start_xmit = baycom_send_packet,
1111 .ndo_set_mac_address = baycom_set_mac_address,
1115 * Check for a network adaptor of this type, and return '0' if one exists.
1116 * If dev->base_addr == 0, probe all likely locations.
1117 * If dev->base_addr == 1, always return failure.
1118 * If dev->base_addr == 2, allocate space for the device and return success
1119 * (detachable devices only).
1121 static void baycom_probe(struct net_device *dev)
1123 const struct hdlcdrv_channel_params dflt_ch_params = {
1126 struct baycom_state *bc;
1129 * not a real probe! only initialize data structures
1131 bc = netdev_priv(dev);
1133 * initialize the baycom_state struct
1135 bc->ch_params = dflt_ch_params;
1139 * initialize the device struct
1142 /* Fill in the fields of the device structure */
1145 dev->netdev_ops = &baycom_netdev_ops;
1146 dev->header_ops = &ax25_header_ops;
1148 dev->type = ARPHRD_AX25; /* AF_AX25 device */
1149 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1150 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
1151 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
1152 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1153 memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1154 dev->tx_queue_len = 16;
1156 /* New style flags */
1160 /* --------------------------------------------------------------------- */
1163 * command line settable parameters
1165 static const char *mode[NR_PORTS] = { "", };
1166 static int iobase[NR_PORTS] = { 0x378, };
1168 module_param_array(mode, charp, NULL, 0);
1169 MODULE_PARM_DESC(mode, "baycom operating mode");
1170 module_param_array(iobase, int, NULL, 0);
1171 MODULE_PARM_DESC(iobase, "baycom io base address");
1173 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1174 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1175 MODULE_LICENSE("GPL");
1177 /* --------------------------------------------------------------------- */
1179 static void __init baycom_epp_dev_setup(struct net_device *dev)
1181 struct baycom_state *bc = netdev_priv(dev);
1184 * initialize part of the baycom_state struct
1187 bc->magic = BAYCOM_MAGIC;
1188 bc->cfg.fclk = 19666600;
1191 * initialize part of the device struct
1196 static int __init init_baycomepp(void)
1203 * register net devices
1205 for (i = 0; i < NR_PORTS; i++) {
1206 struct net_device *dev;
1208 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1209 baycom_epp_dev_setup);
1212 printk(KERN_WARNING "bce%d : out of memory\n", i);
1213 return found ? 0 : -ENOMEM;
1216 sprintf(dev->name, "bce%d", i);
1217 dev->base_addr = iobase[i];
1224 if (register_netdev(dev)) {
1225 printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1229 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1231 baycom_device[i] = dev;
1235 return found ? 0 : -ENXIO;
1238 static void __exit cleanup_baycomepp(void)
1242 for(i = 0; i < NR_PORTS; i++) {
1243 struct net_device *dev = baycom_device[i];
1246 struct baycom_state *bc = netdev_priv(dev);
1247 if (bc->magic == BAYCOM_MAGIC) {
1248 unregister_netdev(dev);
1251 printk(paranoia_str, "cleanup_module");
1256 module_init(init_baycomepp);
1257 module_exit(cleanup_baycomepp);
1259 /* --------------------------------------------------------------------- */
1264 * format: baycom_epp=io,mode
1265 * mode: fpga config options
1268 static int __init baycom_epp_setup(char *str)
1270 static unsigned __initdata nr_dev = 0;
1273 if (nr_dev >= NR_PORTS)
1275 str = get_options(str, 2, ints);
1279 iobase[nr_dev] = ints[1];
1284 __setup("baycom_epp=", baycom_epp_setup);
1287 /* --------------------------------------------------------------------- */