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/config.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/smp_lock.h>
52 #include <asm/uaccess.h>
53 #include <linux/if_arp.h>
54 #include <linux/kmod.h>
55 #include <linux/hdlcdrv.h>
56 #include <linux/baycom.h>
57 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
58 /* prototypes for ax25_encapsulate and ax25_rebuild_header */
60 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
61 #include <linux/crc-ccitt.h>
63 /* --------------------------------------------------------------------- */
66 #define BAYCOM_MAGIC 19730510
68 /* --------------------------------------------------------------------- */
70 static const char paranoia_str[] = KERN_ERR
71 "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
73 static const char bc_drvname[] = "baycom_epp";
74 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
75 KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
77 /* --------------------------------------------------------------------- */
81 static struct net_device *baycom_device[NR_PORTS];
83 /* --------------------------------------------------------------------- */
85 /* EPP status register */
86 #define EPP_DCDBIT 0x80
87 #define EPP_PTTBIT 0x08
89 #define EPP_NRAEF 0x02
92 #define EPP_NTAEF 0x10
93 #define EPP_NTEF EPP_PTTBIT
95 /* EPP control register */
96 #define EPP_TX_FIFO_ENABLE 0x10
97 #define EPP_RX_FIFO_ENABLE 0x08
98 #define EPP_MODEM_ENABLE 0x20
100 #define EPP_IRQ_ENABLE 0x10
103 #define LPTREG_ECONTROL 0x402
104 #define LPTREG_CONFIGB 0x401
105 #define LPTREG_CONFIGA 0x400
106 #define LPTREG_EPPDATA 0x004
107 #define LPTREG_EPPADDR 0x003
108 #define LPTREG_CONTROL 0x002
109 #define LPTREG_STATUS 0x001
110 #define LPTREG_DATA 0x000
112 /* LPT control register */
113 #define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */
114 #define LPTCTRL_WRITE 0x01
115 #define LPTCTRL_ADDRSTB 0x08
116 #define LPTCTRL_DATASTB 0x02
117 #define LPTCTRL_INTEN 0x10
119 /* LPT status register */
120 #define LPTSTAT_SHIFT_NINTR 6
121 #define LPTSTAT_WAIT 0x80
122 #define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR)
123 #define LPTSTAT_PE 0x20
124 #define LPTSTAT_DONE 0x10
125 #define LPTSTAT_NERROR 0x08
126 #define LPTSTAT_EPPTIMEOUT 0x01
128 /* LPT data register */
129 #define LPTDATA_SHIFT_TDI 0
130 #define LPTDATA_SHIFT_TMS 2
131 #define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI)
132 #define LPTDATA_TCK 0x02
133 #define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS)
134 #define LPTDATA_INITBIAS 0x80
137 /* EPP modem config/status bits */
138 #define EPP_DCDBIT 0x80
139 #define EPP_PTTBIT 0x08
140 #define EPP_RXEBIT 0x01
141 #define EPP_RXAEBIT 0x02
142 #define EPP_RXHFULL 0x04
144 #define EPP_NTHF 0x20
145 #define EPP_NTAEF 0x10
146 #define EPP_NTEF EPP_PTTBIT
148 #define EPP_TX_FIFO_ENABLE 0x10
149 #define EPP_RX_FIFO_ENABLE 0x08
150 #define EPP_MODEM_ENABLE 0x20
151 #define EPP_LEDS 0xC0
152 #define EPP_IRQ_ENABLE 0x10
154 /* Xilinx 4k JTAG instructions */
155 #define XC4K_IRLENGTH 3
156 #define XC4K_EXTEST 0
157 #define XC4K_PRELOAD 1
158 #define XC4K_CONFIGURE 5
159 #define XC4K_BYPASS 7
161 #define EPP_CONVENTIONAL 0
163 #define EPP_FPGAEXTSTATUS 2
165 #define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8)
167 /* ---------------------------------------------------------------------- */
169 * Information that need to be kept for each board.
172 struct baycom_state {
175 struct pardevice *pdev;
176 unsigned int work_running;
177 struct work_struct run_work;
179 unsigned int bitrate;
186 unsigned int extmodem;
187 unsigned int loopback;
190 struct hdlcdrv_channel_params ch_params;
193 unsigned int bitbuf, bitstream, numbits, state;
194 unsigned char *bufptr;
196 unsigned char buf[TXBUFFER_SIZE];
203 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
204 unsigned char *bufptr;
206 unsigned char buf[TXBUFFER_SIZE];
209 struct net_device_stats stats;
210 unsigned int ptt_keyed;
211 struct sk_buff *skb; /* next transmit packet */
215 unsigned long last_jiffies;
217 unsigned last_intcnt;
220 unsigned int mod_cycles;
221 unsigned int demod_cycles;
223 #endif /* BAYCOM_DEBUG */
226 /* --------------------------------------------------------------------- */
230 /* --------------------------------------------------------------------- */
232 #define PARAM_TXDELAY 1
233 #define PARAM_PERSIST 2
234 #define PARAM_SLOTTIME 3
235 #define PARAM_TXTAIL 4
236 #define PARAM_FULLDUP 5
237 #define PARAM_HARDWARE 6
238 #define PARAM_RETURN 255
240 /* --------------------------------------------------------------------- */
242 * the CRC routines are stolen from WAMPES
247 /*---------------------------------------------------------------------------*/
250 static inline void append_crc_ccitt(unsigned char *buffer, int len)
252 unsigned int crc = 0xffff;
255 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
258 *buffer++ = crc >> 8;
262 /*---------------------------------------------------------------------------*/
264 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
266 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
269 /*---------------------------------------------------------------------------*/
271 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
273 return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
276 /* ---------------------------------------------------------------------- */
278 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
280 /* --------------------------------------------------------------------- */
282 static inline void baycom_int_freq(struct baycom_state *bc)
285 unsigned long cur_jiffies = jiffies;
287 * measure the interrupt frequency
289 bc->debug_vals.cur_intcnt++;
290 if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
291 bc->debug_vals.last_jiffies = cur_jiffies;
292 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
293 bc->debug_vals.cur_intcnt = 0;
294 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
295 bc->debug_vals.cur_pllcorr = 0;
297 #endif /* BAYCOM_DEBUG */
300 /* ---------------------------------------------------------------------- */
302 * eppconfig_path should be setable via /proc/sys.
305 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
307 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
309 /* eppconfig: called during ifconfig up to configure the modem */
310 static int eppconfig(struct baycom_state *bc)
314 char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
317 /* set up arguments */
318 sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
319 bc->cfg.intclk ? "int" : "ext",
320 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
321 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
322 bc->cfg.loopback ? ",loopback" : "");
323 sprintf(portarg, "%ld", bc->pdev->port->base);
324 printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
326 return call_usermodehelper(eppconfig_path, argv, envp, 1);
329 /* ---------------------------------------------------------------------- */
331 static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
335 /* ---------------------------------------------------------------------- */
337 static inline void do_kiss_params(struct baycom_state *bc,
338 unsigned char *data, unsigned long len)
342 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
343 #else /* KISS_VERBOSE */
345 #endif /* KISS_VERBOSE */
351 bc->ch_params.tx_delay = data[1];
352 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
355 bc->ch_params.ppersist = data[1];
356 PKP("p persistence = %u", bc->ch_params.ppersist);
359 bc->ch_params.slottime = data[1];
360 PKP("slot time = %ums", bc->ch_params.slottime);
363 bc->ch_params.tx_tail = data[1];
364 PKP("TX tail = %ums", bc->ch_params.tx_tail);
367 bc->ch_params.fulldup = !!data[1];
368 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
376 /* --------------------------------------------------------------------- */
378 * high performance HDLC encoder
379 * yes, it's ugly, but generates pretty good code
382 #define ENCODEITERA(j) \
384 if (!(notbitstream & (0x1f0 << j))) \
389 #define ENCODEITERB(j) \
392 bitstream &= ~(0x100 << j); \
393 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) | \
394 ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1); \
396 notbitstream = ~bitstream; \
401 static void encode_hdlc(struct baycom_state *bc)
404 unsigned char *wp, *bp;
406 unsigned bitstream, notbitstream, bitbuf, numbit, crc;
407 unsigned char crcarr[2];
409 if (bc->hdlctx.bufcnt > 0)
415 pkt_len = skb->len-1; /* strip KISS byte */
418 crc = calc_crc_ccitt(bp, pkt_len);
420 crcarr[1] = crc >> 8;
422 bitstream = bitbuf = numbit = 0;
423 while (pkt_len > -2) {
425 bitstream |= ((unsigned int)*bp) << 8;
426 bitbuf |= ((unsigned int)*bp) << numbit;
427 notbitstream = ~bitstream;
451 while (numbit >= 8) {
457 bitbuf |= 0x7e7e << numbit;
459 while (numbit >= 8) {
464 bc->hdlctx.bufptr = bc->hdlctx.buf;
465 bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
467 bc->stats.tx_packets++;
470 /* ---------------------------------------------------------------------- */
472 static unsigned short random_seed;
474 static inline unsigned short random_num(void)
476 random_seed = 28629 * random_seed + 157;
480 /* ---------------------------------------------------------------------- */
482 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
484 struct parport *pp = bc->pdev->port;
485 unsigned char tmp[128];
488 if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
489 bc->hdlctx.state = tx_idle;
490 if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
491 if (bc->hdlctx.bufcnt <= 0)
493 if (bc->hdlctx.bufcnt <= 0)
495 if (!bc->ch_params.fulldup) {
496 if (!(stat & EPP_DCDBIT)) {
497 bc->hdlctx.slotcnt = bc->ch_params.slottime;
500 if ((--bc->hdlctx.slotcnt) > 0)
502 bc->hdlctx.slotcnt = bc->ch_params.slottime;
503 if ((random_num() % 256) > bc->ch_params.ppersist)
507 if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
508 bc->hdlctx.state = tx_keyup;
509 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
513 switch (bc->hdlctx.state) {
515 i = min_t(int, cnt, bc->hdlctx.flags);
517 bc->hdlctx.flags -= i;
518 if (bc->hdlctx.flags <= 0)
519 bc->hdlctx.state = tx_data;
520 memset(tmp, 0x7e, sizeof(tmp));
522 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
523 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
530 if (bc->hdlctx.bufcnt <= 0) {
532 if (bc->hdlctx.bufcnt <= 0) {
533 bc->hdlctx.state = tx_tail;
534 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
538 i = min_t(int, cnt, bc->hdlctx.bufcnt);
539 bc->hdlctx.bufcnt -= i;
541 if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
543 bc->hdlctx.bufptr += i;
548 if (bc->hdlctx.bufcnt > 0) {
549 bc->hdlctx.state = tx_data;
552 i = min_t(int, cnt, bc->hdlctx.flags);
555 bc->hdlctx.flags -= i;
556 memset(tmp, 0x7e, sizeof(tmp));
558 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
559 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
566 default: /* fall through */
567 if (bc->hdlctx.calibrate <= 0)
569 i = min_t(int, cnt, bc->hdlctx.calibrate);
571 bc->hdlctx.calibrate -= i;
572 memset(tmp, 0, sizeof(tmp));
574 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
575 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
585 /* ---------------------------------------------------------------------- */
587 static void do_rxpacket(struct net_device *dev)
589 struct baycom_state *bc = netdev_priv(dev);
594 if (bc->hdlcrx.bufcnt < 4)
596 if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
598 pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
599 if (!(skb = dev_alloc_skb(pktlen))) {
600 printk("%s: memory squeeze, dropping packet\n", dev->name);
601 bc->stats.rx_dropped++;
604 cp = skb_put(skb, pktlen);
605 *cp++ = 0; /* KISS kludge */
606 memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
607 skb->protocol = ax25_type_trans(skb, dev);
609 dev->last_rx = jiffies;
610 bc->stats.rx_packets++;
613 #define DECODEITERA(j) \
615 if (!(notbitstream & (0x0fc << j))) /* flag or abort */ \
617 if ((bitstream & (0x1f8 << j)) == (0xf8 << j)) /* stuffed bit */ \
622 #define DECODEITERB(j) \
625 if (!(notbitstream & (0x1fc << j))) { /* abort received */ \
629 if ((bitstream & (0x1fe << j)) != (0x0fc << j)) /* flag received */ \
633 bc->hdlcrx.bufcnt = 0; \
634 bc->hdlcrx.bufptr = bc->hdlcrx.buf; \
640 bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1); \
644 static int receive(struct net_device *dev, int cnt)
646 struct baycom_state *bc = netdev_priv(dev);
647 struct parport *pp = bc->pdev->port;
648 unsigned int bitbuf, notbitstream, bitstream, numbits, state;
649 unsigned char tmp[128];
653 numbits = bc->hdlcrx.numbits;
654 state = bc->hdlcrx.state;
655 bitstream = bc->hdlcrx.bitstream;
656 bitbuf = bc->hdlcrx.bitbuf;
658 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
660 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
665 for (; cnt2 > 0; cnt2--, cp++) {
667 bitstream |= (*cp) << 8;
669 bitbuf |= (*cp) << 8;
671 notbitstream = ~bitstream;
690 while (state && numbits >= 8) {
691 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
694 *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
701 bc->hdlcrx.numbits = numbits;
702 bc->hdlcrx.state = state;
703 bc->hdlcrx.bitstream = bitstream;
704 bc->hdlcrx.bitbuf = bitbuf;
708 /* --------------------------------------------------------------------- */
719 #endif /* __i386__ */
721 static void epp_bh(struct net_device *dev)
723 struct baycom_state *bc;
726 unsigned char tmp[2];
727 unsigned int time1 = 0, time2 = 0, time3 = 0;
730 bc = netdev_priv(dev);
731 if (!bc->work_running)
736 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
739 bc->debug_vals.last_pllcorr = stat;
741 if (bc->modem == EPP_FPGAEXTSTATUS) {
742 /* get input count */
743 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
744 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
746 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
748 cnt = tmp[0] | (tmp[1] << 8);
750 /* get output count */
751 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
752 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
754 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
756 cnt2 = tmp[0] | (tmp[1] << 8);
757 cnt2 = 16384 - (cnt2 & 0x7fff);
758 /* return to normal */
759 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
760 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
762 if (transmit(bc, cnt2, stat))
765 if (receive(dev, cnt))
767 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
772 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
789 if (transmit(bc, cnt, stat))
793 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
794 switch (stat & (EPP_NRAEF|EPP_NRHF)) {
807 if (receive(dev, cnt))
809 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
813 if (bc->bitrate < 50000)
815 else if (bc->bitrate < 100000)
817 while (cnt > 0 && stat & EPP_NREF) {
821 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
827 bc->debug_vals.mod_cycles = time2 - time1;
828 bc->debug_vals.demod_cycles = time3 - time2;
829 #endif /* BAYCOM_DEBUG */
830 schedule_delayed_work(&bc->run_work, 1);
832 netif_wake_queue(dev);
835 printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
838 /* ---------------------------------------------------------------------- */
840 * ===================== network driver interface =========================
843 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
845 struct baycom_state *bc = netdev_priv(dev);
847 if (skb->data[0] != 0) {
848 do_kiss_params(bc, skb->data, skb->len);
854 /* strip KISS byte */
855 if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
859 netif_stop_queue(dev);
864 /* --------------------------------------------------------------------- */
866 static int baycom_set_mac_address(struct net_device *dev, void *addr)
868 struct sockaddr *sa = (struct sockaddr *)addr;
870 /* addr is an AX.25 shifted ASCII mac address */
871 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
875 /* --------------------------------------------------------------------- */
877 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
879 struct baycom_state *bc = netdev_priv(dev);
882 * Get the current statistics. This may be called with the
883 * card open or closed.
888 /* --------------------------------------------------------------------- */
890 static void epp_wakeup(void *handle)
892 struct net_device *dev = (struct net_device *)handle;
893 struct baycom_state *bc = netdev_priv(dev);
895 printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
896 if (!parport_claim(bc->pdev))
897 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
900 /* --------------------------------------------------------------------- */
903 * Open/initialize the board. This is called (in the current kernel)
904 * sometime after booting when the 'ifconfig' program is run.
906 * This routine should set everything up anew at each open, even
907 * registers that "should" only need to be set once at boot, so that
908 * there is non-reboot way to recover if something goes wrong.
911 static int epp_open(struct net_device *dev)
913 struct baycom_state *bc = netdev_priv(dev);
914 struct parport *pp = parport_find_base(dev->base_addr);
916 unsigned char tmp[128];
918 unsigned long tstart;
921 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
926 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
927 parport_put_port(pp);
931 if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
932 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
933 bc_drvname, pp->base);
934 parport_put_port(pp);
937 memset(&bc->modem, 0, sizeof(bc->modem));
938 bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
939 epp_interrupt, PARPORT_DEV_EXCL, dev);
940 parport_put_port(pp);
942 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
945 if (parport_claim(bc->pdev)) {
946 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
947 parport_unregister_device(bc->pdev);
950 dev->irq = /*pp->irq*/ 0;
951 INIT_WORK(&bc->run_work, (void *)(void *)epp_bh, dev);
952 bc->work_running = 1;
953 bc->modem = EPP_CONVENTIONAL;
955 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
957 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
958 parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
959 /* reset the modem */
961 tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
962 if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
964 /* autoprobe baud rate */
967 while ((signed)(jiffies-tstart-HZ/3) < 0) {
968 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
970 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
974 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
976 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
980 for (j = 0; j < 256; j++) {
981 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
983 if (!(stat & EPP_NREF))
985 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
989 tstart = jiffies - tstart;
990 bc->bitrate = i * (8 * HZ) / tstart;
992 i = bc->bitrate >> 3;
993 while (j < 7 && i > 150) {
997 printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n",
998 bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
999 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
1000 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
1003 * initialise hdlc variables
1005 bc->hdlcrx.state = 0;
1006 bc->hdlcrx.numbits = 0;
1007 bc->hdlctx.state = tx_idle;
1008 bc->hdlctx.bufcnt = 0;
1009 bc->hdlctx.slotcnt = bc->ch_params.slottime;
1010 bc->hdlctx.calibrate = 0;
1011 /* start the bottom half stuff */
1012 schedule_delayed_work(&bc->run_work, 1);
1013 netif_start_queue(dev);
1017 printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
1018 parport_write_control(pp, 0); /* reset the adapter */
1019 parport_release(bc->pdev);
1020 parport_unregister_device(bc->pdev);
1024 /* --------------------------------------------------------------------- */
1026 static int epp_close(struct net_device *dev)
1028 struct baycom_state *bc = netdev_priv(dev);
1029 struct parport *pp = bc->pdev->port;
1030 unsigned char tmp[1];
1032 bc->work_running = 0;
1033 flush_scheduled_work();
1034 bc->stat = EPP_DCDBIT;
1036 pp->ops->epp_write_addr(pp, tmp, 1, 0);
1037 parport_write_control(pp, 0); /* reset the adapter */
1038 parport_release(bc->pdev);
1039 parport_unregister_device(bc->pdev);
1041 dev_kfree_skb(bc->skb);
1043 printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
1044 bc_drvname, dev->base_addr, dev->irq);
1048 /* --------------------------------------------------------------------- */
1050 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
1054 if (strstr(modestr,"intclk"))
1056 if (strstr(modestr,"extclk"))
1058 if (strstr(modestr,"intmodem"))
1059 bc->cfg.extmodem = 0;
1060 if (strstr(modestr,"extmodem"))
1061 bc->cfg.extmodem = 1;
1062 if (strstr(modestr,"noloopback"))
1063 bc->cfg.loopback = 0;
1064 if (strstr(modestr,"loopback"))
1065 bc->cfg.loopback = 1;
1066 if ((cp = strstr(modestr,"fclk="))) {
1067 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1068 if (bc->cfg.fclk < 1000000)
1069 bc->cfg.fclk = 1000000;
1070 if (bc->cfg.fclk > 25000000)
1071 bc->cfg.fclk = 25000000;
1073 if ((cp = strstr(modestr,"bps="))) {
1074 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1075 if (bc->cfg.bps < 1000)
1077 if (bc->cfg.bps > 1500000)
1078 bc->cfg.bps = 1500000;
1083 /* --------------------------------------------------------------------- */
1085 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1087 struct baycom_state *bc = netdev_priv(dev);
1088 struct hdlcdrv_ioctl hi;
1090 if (cmd != SIOCDEVPRIVATE)
1091 return -ENOIOCTLCMD;
1093 if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1097 return -ENOIOCTLCMD;
1099 case HDLCDRVCTL_GETCHANNELPAR:
1100 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1101 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1102 hi.data.cp.slottime = bc->ch_params.slottime;
1103 hi.data.cp.ppersist = bc->ch_params.ppersist;
1104 hi.data.cp.fulldup = bc->ch_params.fulldup;
1107 case HDLCDRVCTL_SETCHANNELPAR:
1108 if (!capable(CAP_NET_ADMIN))
1110 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1111 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1112 bc->ch_params.slottime = hi.data.cp.slottime;
1113 bc->ch_params.ppersist = hi.data.cp.ppersist;
1114 bc->ch_params.fulldup = hi.data.cp.fulldup;
1115 bc->hdlctx.slotcnt = 1;
1118 case HDLCDRVCTL_GETMODEMPAR:
1119 hi.data.mp.iobase = dev->base_addr;
1120 hi.data.mp.irq = dev->irq;
1121 hi.data.mp.dma = dev->dma;
1122 hi.data.mp.dma2 = 0;
1123 hi.data.mp.seriobase = 0;
1124 hi.data.mp.pariobase = 0;
1125 hi.data.mp.midiiobase = 0;
1128 case HDLCDRVCTL_SETMODEMPAR:
1129 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1131 dev->base_addr = hi.data.mp.iobase;
1132 dev->irq = /*hi.data.mp.irq*/0;
1133 dev->dma = /*hi.data.mp.dma*/0;
1136 case HDLCDRVCTL_GETSTAT:
1137 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1138 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1139 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1140 hi.data.cs.tx_packets = bc->stats.tx_packets;
1141 hi.data.cs.tx_errors = bc->stats.tx_errors;
1142 hi.data.cs.rx_packets = bc->stats.rx_packets;
1143 hi.data.cs.rx_errors = bc->stats.rx_errors;
1146 case HDLCDRVCTL_OLDGETSTAT:
1147 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1148 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1149 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1152 case HDLCDRVCTL_CALIBRATE:
1153 if (!capable(CAP_SYS_RAWIO))
1155 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1158 case HDLCDRVCTL_DRIVERNAME:
1159 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1162 case HDLCDRVCTL_GETMODE:
1163 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1164 bc->cfg.intclk ? "int" : "ext",
1165 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1166 bc->cfg.loopback ? ",loopback" : "");
1169 case HDLCDRVCTL_SETMODE:
1170 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1172 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1173 return baycom_setmode(bc, hi.data.modename);
1175 case HDLCDRVCTL_MODELIST:
1176 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1177 sizeof(hi.data.modename));
1180 case HDLCDRVCTL_MODEMPARMASK:
1181 return HDLCDRV_PARMASK_IOBASE;
1184 if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1189 /* --------------------------------------------------------------------- */
1192 * Check for a network adaptor of this type, and return '0' if one exists.
1193 * If dev->base_addr == 0, probe all likely locations.
1194 * If dev->base_addr == 1, always return failure.
1195 * If dev->base_addr == 2, allocate space for the device and return success
1196 * (detachable devices only).
1198 static void baycom_probe(struct net_device *dev)
1200 static char ax25_bcast[AX25_ADDR_LEN] = {
1201 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1
1203 static char ax25_nocall[AX25_ADDR_LEN] = {
1204 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1
1206 const struct hdlcdrv_channel_params dflt_ch_params = {
1209 struct baycom_state *bc;
1212 * not a real probe! only initialize data structures
1214 bc = netdev_priv(dev);
1216 * initialize the baycom_state struct
1218 bc->ch_params = dflt_ch_params;
1222 * initialize the device struct
1224 dev->open = epp_open;
1225 dev->stop = epp_close;
1226 dev->do_ioctl = baycom_ioctl;
1227 dev->hard_start_xmit = baycom_send_packet;
1228 dev->get_stats = baycom_get_stats;
1230 /* Fill in the fields of the device structure */
1233 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
1234 dev->hard_header = ax25_encapsulate;
1235 dev->rebuild_header = ax25_rebuild_header;
1236 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1237 dev->hard_header = NULL;
1238 dev->rebuild_header = NULL;
1239 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1240 dev->set_mac_address = baycom_set_mac_address;
1242 dev->type = ARPHRD_AX25; /* AF_AX25 device */
1243 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1244 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
1245 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
1246 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
1247 memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
1248 dev->tx_queue_len = 16;
1250 /* New style flags */
1254 /* --------------------------------------------------------------------- */
1257 * command line settable parameters
1259 static const char *mode[NR_PORTS] = { "", };
1260 static int iobase[NR_PORTS] = { 0x378, };
1262 module_param_array(mode, charp, NULL, 0);
1263 MODULE_PARM_DESC(mode, "baycom operating mode");
1264 module_param_array(iobase, int, NULL, 0);
1265 MODULE_PARM_DESC(iobase, "baycom io base address");
1267 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1268 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1269 MODULE_LICENSE("GPL");
1271 /* --------------------------------------------------------------------- */
1273 static void __init baycom_epp_dev_setup(struct net_device *dev)
1275 struct baycom_state *bc = netdev_priv(dev);
1278 * initialize part of the baycom_state struct
1280 bc->magic = BAYCOM_MAGIC;
1281 bc->cfg.fclk = 19666600;
1284 * initialize part of the device struct
1289 static int __init init_baycomepp(void)
1296 * register net devices
1298 for (i = 0; i < NR_PORTS; i++) {
1299 struct net_device *dev;
1301 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1302 baycom_epp_dev_setup);
1305 printk(KERN_WARNING "bce%d : out of memory\n", i);
1306 return found ? 0 : -ENOMEM;
1309 sprintf(dev->name, "bce%d", i);
1310 dev->base_addr = iobase[i];
1317 if (register_netdev(dev)) {
1318 printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1322 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1324 baycom_device[i] = dev;
1328 return found ? 0 : -ENXIO;
1331 static void __exit cleanup_baycomepp(void)
1335 for(i = 0; i < NR_PORTS; i++) {
1336 struct net_device *dev = baycom_device[i];
1339 struct baycom_state *bc = netdev_priv(dev);
1340 if (bc->magic == BAYCOM_MAGIC) {
1341 unregister_netdev(dev);
1344 printk(paranoia_str, "cleanup_module");
1349 module_init(init_baycomepp);
1350 module_exit(cleanup_baycomepp);
1352 /* --------------------------------------------------------------------- */
1357 * format: baycom_epp=io,mode
1358 * mode: fpga config options
1361 static int __init baycom_epp_setup(char *str)
1363 static unsigned __initdata nr_dev = 0;
1366 if (nr_dev >= NR_PORTS)
1368 str = get_options(str, 2, ints);
1372 iobase[nr_dev] = ints[1];
1377 __setup("baycom_epp=", baycom_epp_setup);
1380 /* --------------------------------------------------------------------- */