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 #define baycom_paranoia_check(dev,routine,retval) \
75 if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \
76 printk(paranoia_str, routine); \
81 #define baycom_paranoia_check_void(dev,routine) \
83 if (!dev || !dev->priv || ((struct baycom_state *)dev->priv)->magic != BAYCOM_MAGIC) { \
84 printk(paranoia_str, routine); \
89 /* --------------------------------------------------------------------- */
91 static const char bc_drvname[] = "baycom_epp";
92 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
93 KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
95 /* --------------------------------------------------------------------- */
99 static struct net_device *baycom_device[NR_PORTS];
101 /* --------------------------------------------------------------------- */
103 /* EPP status register */
104 #define EPP_DCDBIT 0x80
105 #define EPP_PTTBIT 0x08
106 #define EPP_NREF 0x01
107 #define EPP_NRAEF 0x02
108 #define EPP_NRHF 0x04
109 #define EPP_NTHF 0x20
110 #define EPP_NTAEF 0x10
111 #define EPP_NTEF EPP_PTTBIT
113 /* EPP control register */
114 #define EPP_TX_FIFO_ENABLE 0x10
115 #define EPP_RX_FIFO_ENABLE 0x08
116 #define EPP_MODEM_ENABLE 0x20
117 #define EPP_LEDS 0xC0
118 #define EPP_IRQ_ENABLE 0x10
121 #define LPTREG_ECONTROL 0x402
122 #define LPTREG_CONFIGB 0x401
123 #define LPTREG_CONFIGA 0x400
124 #define LPTREG_EPPDATA 0x004
125 #define LPTREG_EPPADDR 0x003
126 #define LPTREG_CONTROL 0x002
127 #define LPTREG_STATUS 0x001
128 #define LPTREG_DATA 0x000
130 /* LPT control register */
131 #define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */
132 #define LPTCTRL_WRITE 0x01
133 #define LPTCTRL_ADDRSTB 0x08
134 #define LPTCTRL_DATASTB 0x02
135 #define LPTCTRL_INTEN 0x10
137 /* LPT status register */
138 #define LPTSTAT_SHIFT_NINTR 6
139 #define LPTSTAT_WAIT 0x80
140 #define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR)
141 #define LPTSTAT_PE 0x20
142 #define LPTSTAT_DONE 0x10
143 #define LPTSTAT_NERROR 0x08
144 #define LPTSTAT_EPPTIMEOUT 0x01
146 /* LPT data register */
147 #define LPTDATA_SHIFT_TDI 0
148 #define LPTDATA_SHIFT_TMS 2
149 #define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI)
150 #define LPTDATA_TCK 0x02
151 #define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS)
152 #define LPTDATA_INITBIAS 0x80
155 /* EPP modem config/status bits */
156 #define EPP_DCDBIT 0x80
157 #define EPP_PTTBIT 0x08
158 #define EPP_RXEBIT 0x01
159 #define EPP_RXAEBIT 0x02
160 #define EPP_RXHFULL 0x04
162 #define EPP_NTHF 0x20
163 #define EPP_NTAEF 0x10
164 #define EPP_NTEF EPP_PTTBIT
166 #define EPP_TX_FIFO_ENABLE 0x10
167 #define EPP_RX_FIFO_ENABLE 0x08
168 #define EPP_MODEM_ENABLE 0x20
169 #define EPP_LEDS 0xC0
170 #define EPP_IRQ_ENABLE 0x10
172 /* Xilinx 4k JTAG instructions */
173 #define XC4K_IRLENGTH 3
174 #define XC4K_EXTEST 0
175 #define XC4K_PRELOAD 1
176 #define XC4K_CONFIGURE 5
177 #define XC4K_BYPASS 7
179 #define EPP_CONVENTIONAL 0
181 #define EPP_FPGAEXTSTATUS 2
183 #define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8)
185 /* ---------------------------------------------------------------------- */
187 * Information that need to be kept for each board.
190 struct baycom_state {
193 struct pardevice *pdev;
194 unsigned int work_running;
195 struct work_struct run_work;
197 unsigned int bitrate;
204 unsigned int extmodem;
205 unsigned int loopback;
208 struct hdlcdrv_channel_params ch_params;
211 unsigned int bitbuf, bitstream, numbits, state;
212 unsigned char *bufptr;
214 unsigned char buf[TXBUFFER_SIZE];
221 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
222 unsigned char *bufptr;
224 unsigned char buf[TXBUFFER_SIZE];
227 struct net_device_stats stats;
228 unsigned int ptt_keyed;
229 struct sk_buff *skb; /* next transmit packet */
233 unsigned long last_jiffies;
235 unsigned last_intcnt;
238 unsigned int mod_cycles;
239 unsigned int demod_cycles;
241 #endif /* BAYCOM_DEBUG */
244 /* --------------------------------------------------------------------- */
248 /* --------------------------------------------------------------------- */
250 #define PARAM_TXDELAY 1
251 #define PARAM_PERSIST 2
252 #define PARAM_SLOTTIME 3
253 #define PARAM_TXTAIL 4
254 #define PARAM_FULLDUP 5
255 #define PARAM_HARDWARE 6
256 #define PARAM_RETURN 255
258 /* --------------------------------------------------------------------- */
260 * the CRC routines are stolen from WAMPES
265 /*---------------------------------------------------------------------------*/
268 static inline void append_crc_ccitt(unsigned char *buffer, int len)
270 unsigned int crc = 0xffff;
273 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
276 *buffer++ = crc >> 8;
280 /*---------------------------------------------------------------------------*/
282 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
284 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
287 /*---------------------------------------------------------------------------*/
289 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
291 return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
294 /* ---------------------------------------------------------------------- */
296 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
298 /* --------------------------------------------------------------------- */
300 static inline void baycom_int_freq(struct baycom_state *bc)
303 unsigned long cur_jiffies = jiffies;
305 * measure the interrupt frequency
307 bc->debug_vals.cur_intcnt++;
308 if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
309 bc->debug_vals.last_jiffies = cur_jiffies;
310 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
311 bc->debug_vals.cur_intcnt = 0;
312 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
313 bc->debug_vals.cur_pllcorr = 0;
315 #endif /* BAYCOM_DEBUG */
318 /* ---------------------------------------------------------------------- */
320 * eppconfig_path should be setable via /proc/sys.
323 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
325 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
327 /* eppconfig: called during ifconfig up to configure the modem */
328 static int eppconfig(struct baycom_state *bc)
332 char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
335 /* set up arguments */
336 sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
337 bc->cfg.intclk ? "int" : "ext",
338 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
339 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
340 bc->cfg.loopback ? ",loopback" : "");
341 sprintf(portarg, "%ld", bc->pdev->port->base);
342 printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
344 return call_usermodehelper(eppconfig_path, argv, envp, 1);
347 /* ---------------------------------------------------------------------- */
349 static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
353 /* ---------------------------------------------------------------------- */
355 static inline void do_kiss_params(struct baycom_state *bc,
356 unsigned char *data, unsigned long len)
360 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
361 #else /* KISS_VERBOSE */
363 #endif /* KISS_VERBOSE */
369 bc->ch_params.tx_delay = data[1];
370 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
373 bc->ch_params.ppersist = data[1];
374 PKP("p persistence = %u", bc->ch_params.ppersist);
377 bc->ch_params.slottime = data[1];
378 PKP("slot time = %ums", bc->ch_params.slottime);
381 bc->ch_params.tx_tail = data[1];
382 PKP("TX tail = %ums", bc->ch_params.tx_tail);
385 bc->ch_params.fulldup = !!data[1];
386 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
394 /* --------------------------------------------------------------------- */
396 * high performance HDLC encoder
397 * yes, it's ugly, but generates pretty good code
400 #define ENCODEITERA(j) \
402 if (!(notbitstream & (0x1f0 << j))) \
407 #define ENCODEITERB(j) \
410 bitstream &= ~(0x100 << j); \
411 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) | \
412 ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1); \
414 notbitstream = ~bitstream; \
419 static void encode_hdlc(struct baycom_state *bc)
422 unsigned char *wp, *bp;
424 unsigned bitstream, notbitstream, bitbuf, numbit, crc;
425 unsigned char crcarr[2];
427 if (bc->hdlctx.bufcnt > 0)
433 pkt_len = skb->len-1; /* strip KISS byte */
436 crc = calc_crc_ccitt(bp, pkt_len);
438 crcarr[1] = crc >> 8;
440 bitstream = bitbuf = numbit = 0;
441 while (pkt_len > -2) {
443 bitstream |= ((unsigned int)*bp) << 8;
444 bitbuf |= ((unsigned int)*bp) << numbit;
445 notbitstream = ~bitstream;
469 while (numbit >= 8) {
475 bitbuf |= 0x7e7e << numbit;
477 while (numbit >= 8) {
482 bc->hdlctx.bufptr = bc->hdlctx.buf;
483 bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
485 bc->stats.tx_packets++;
488 /* ---------------------------------------------------------------------- */
490 static unsigned short random_seed;
492 static inline unsigned short random_num(void)
494 random_seed = 28629 * random_seed + 157;
498 /* ---------------------------------------------------------------------- */
500 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
502 struct parport *pp = bc->pdev->port;
503 unsigned char tmp[128];
506 if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
507 bc->hdlctx.state = tx_idle;
508 if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
509 if (bc->hdlctx.bufcnt <= 0)
511 if (bc->hdlctx.bufcnt <= 0)
513 if (!bc->ch_params.fulldup) {
514 if (!(stat & EPP_DCDBIT)) {
515 bc->hdlctx.slotcnt = bc->ch_params.slottime;
518 if ((--bc->hdlctx.slotcnt) > 0)
520 bc->hdlctx.slotcnt = bc->ch_params.slottime;
521 if ((random_num() % 256) > bc->ch_params.ppersist)
525 if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
526 bc->hdlctx.state = tx_keyup;
527 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
531 switch (bc->hdlctx.state) {
533 i = min_t(int, cnt, bc->hdlctx.flags);
535 bc->hdlctx.flags -= i;
536 if (bc->hdlctx.flags <= 0)
537 bc->hdlctx.state = tx_data;
538 memset(tmp, 0x7e, sizeof(tmp));
540 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
541 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
548 if (bc->hdlctx.bufcnt <= 0) {
550 if (bc->hdlctx.bufcnt <= 0) {
551 bc->hdlctx.state = tx_tail;
552 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
556 i = min_t(int, cnt, bc->hdlctx.bufcnt);
557 bc->hdlctx.bufcnt -= i;
559 if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
561 bc->hdlctx.bufptr += i;
566 if (bc->hdlctx.bufcnt > 0) {
567 bc->hdlctx.state = tx_data;
570 i = min_t(int, cnt, bc->hdlctx.flags);
573 bc->hdlctx.flags -= i;
574 memset(tmp, 0x7e, sizeof(tmp));
576 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
577 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
584 default: /* fall through */
585 if (bc->hdlctx.calibrate <= 0)
587 i = min_t(int, cnt, bc->hdlctx.calibrate);
589 bc->hdlctx.calibrate -= i;
590 memset(tmp, 0, sizeof(tmp));
592 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
593 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
603 /* ---------------------------------------------------------------------- */
605 static void do_rxpacket(struct net_device *dev)
607 struct baycom_state *bc = netdev_priv(dev);
612 if (bc->hdlcrx.bufcnt < 4)
614 if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
616 pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
617 if (!(skb = dev_alloc_skb(pktlen))) {
618 printk("%s: memory squeeze, dropping packet\n", dev->name);
619 bc->stats.rx_dropped++;
623 cp = skb_put(skb, pktlen);
624 *cp++ = 0; /* KISS kludge */
625 memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
626 skb->protocol = htons(ETH_P_AX25);
627 skb->mac.raw = skb->data;
629 dev->last_rx = jiffies;
630 bc->stats.rx_packets++;
633 #define DECODEITERA(j) \
635 if (!(notbitstream & (0x0fc << j))) /* flag or abort */ \
637 if ((bitstream & (0x1f8 << j)) == (0xf8 << j)) /* stuffed bit */ \
642 #define DECODEITERB(j) \
645 if (!(notbitstream & (0x1fc << j))) { /* abort received */ \
649 if ((bitstream & (0x1fe << j)) != (0x0fc << j)) /* flag received */ \
653 bc->hdlcrx.bufcnt = 0; \
654 bc->hdlcrx.bufptr = bc->hdlcrx.buf; \
660 bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1); \
664 static int receive(struct net_device *dev, int cnt)
666 struct baycom_state *bc = netdev_priv(dev);
667 struct parport *pp = bc->pdev->port;
668 unsigned int bitbuf, notbitstream, bitstream, numbits, state;
669 unsigned char tmp[128];
673 numbits = bc->hdlcrx.numbits;
674 state = bc->hdlcrx.state;
675 bitstream = bc->hdlcrx.bitstream;
676 bitbuf = bc->hdlcrx.bitbuf;
678 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
680 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
685 for (; cnt2 > 0; cnt2--, cp++) {
687 bitstream |= (*cp) << 8;
689 bitbuf |= (*cp) << 8;
691 notbitstream = ~bitstream;
710 while (state && numbits >= 8) {
711 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
714 *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
721 bc->hdlcrx.numbits = numbits;
722 bc->hdlcrx.state = state;
723 bc->hdlcrx.bitstream = bitstream;
724 bc->hdlcrx.bitbuf = bitbuf;
728 /* --------------------------------------------------------------------- */
739 #endif /* __i386__ */
741 static void epp_bh(struct net_device *dev)
743 struct baycom_state *bc;
746 unsigned char tmp[2];
747 unsigned int time1 = 0, time2 = 0, time3 = 0;
750 baycom_paranoia_check_void(dev, "epp_bh");
751 bc = netdev_priv(dev);
752 if (!bc->work_running)
757 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
760 bc->debug_vals.last_pllcorr = stat;
762 if (bc->modem == EPP_FPGAEXTSTATUS) {
763 /* get input count */
764 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
765 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
767 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
769 cnt = tmp[0] | (tmp[1] << 8);
771 /* get output count */
772 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
773 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
775 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
777 cnt2 = tmp[0] | (tmp[1] << 8);
778 cnt2 = 16384 - (cnt2 & 0x7fff);
779 /* return to normal */
780 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
781 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
783 if (transmit(bc, cnt2, stat))
786 if (receive(dev, cnt))
788 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
793 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
810 if (transmit(bc, cnt, stat))
814 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
815 switch (stat & (EPP_NRAEF|EPP_NRHF)) {
828 if (receive(dev, cnt))
830 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
834 if (bc->bitrate < 50000)
836 else if (bc->bitrate < 100000)
838 while (cnt > 0 && stat & EPP_NREF) {
842 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
848 bc->debug_vals.mod_cycles = time2 - time1;
849 bc->debug_vals.demod_cycles = time3 - time2;
850 #endif /* BAYCOM_DEBUG */
851 schedule_delayed_work(&bc->run_work, 1);
853 netif_wake_queue(dev);
856 printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
859 /* ---------------------------------------------------------------------- */
861 * ===================== network driver interface =========================
864 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
866 struct baycom_state *bc;
868 baycom_paranoia_check(dev, "baycom_send_packet", 0);
869 bc = netdev_priv(dev);
870 if (skb->data[0] != 0) {
871 do_kiss_params(bc, skb->data, skb->len);
877 /* strip KISS byte */
878 if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
882 netif_stop_queue(dev);
887 /* --------------------------------------------------------------------- */
889 static int baycom_set_mac_address(struct net_device *dev, void *addr)
891 struct sockaddr *sa = (struct sockaddr *)addr;
893 /* addr is an AX.25 shifted ASCII mac address */
894 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
898 /* --------------------------------------------------------------------- */
900 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
902 struct baycom_state *bc;
904 baycom_paranoia_check(dev, "baycom_get_stats", NULL);
905 bc = netdev_priv(dev);
907 * Get the current statistics. This may be called with the
908 * card open or closed.
913 /* --------------------------------------------------------------------- */
915 static void epp_wakeup(void *handle)
917 struct net_device *dev = (struct net_device *)handle;
918 struct baycom_state *bc;
920 baycom_paranoia_check_void(dev, "epp_wakeup");
921 bc = netdev_priv(dev);
922 printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
923 if (!parport_claim(bc->pdev))
924 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
927 /* --------------------------------------------------------------------- */
930 * Open/initialize the board. This is called (in the current kernel)
931 * sometime after booting when the 'ifconfig' program is run.
933 * This routine should set everything up anew at each open, even
934 * registers that "should" only need to be set once at boot, so that
935 * there is non-reboot way to recover if something goes wrong.
938 static int epp_open(struct net_device *dev)
940 struct baycom_state *bc;
943 unsigned char tmp[128];
945 unsigned long tstart;
947 baycom_paranoia_check(dev, "epp_open", -ENXIO);
948 bc = netdev_priv(dev);
949 pp = parport_find_base(dev->base_addr);
951 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
956 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
957 parport_put_port(pp);
961 if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
962 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
963 bc_drvname, pp->base);
964 parport_put_port(pp);
967 memset(&bc->modem, 0, sizeof(bc->modem));
968 bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
969 epp_interrupt, PARPORT_DEV_EXCL, dev);
970 parport_put_port(pp);
972 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
975 if (parport_claim(bc->pdev)) {
976 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
977 parport_unregister_device(bc->pdev);
980 dev->irq = /*pp->irq*/ 0;
981 INIT_WORK(&bc->run_work, (void *)(void *)epp_bh, dev);
982 bc->work_running = 1;
983 bc->modem = EPP_CONVENTIONAL;
985 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
987 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
988 parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
989 /* reset the modem */
991 tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
992 if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
994 /* autoprobe baud rate */
997 while ((signed)(jiffies-tstart-HZ/3) < 0) {
998 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
1000 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
1004 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
1006 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
1010 for (j = 0; j < 256; j++) {
1011 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
1013 if (!(stat & EPP_NREF))
1015 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
1019 tstart = jiffies - tstart;
1020 bc->bitrate = i * (8 * HZ) / tstart;
1022 i = bc->bitrate >> 3;
1023 while (j < 7 && i > 150) {
1027 printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n",
1028 bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
1029 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
1030 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
1033 * initialise hdlc variables
1035 bc->hdlcrx.state = 0;
1036 bc->hdlcrx.numbits = 0;
1037 bc->hdlctx.state = tx_idle;
1038 bc->hdlctx.bufcnt = 0;
1039 bc->hdlctx.slotcnt = bc->ch_params.slottime;
1040 bc->hdlctx.calibrate = 0;
1041 /* start the bottom half stuff */
1042 schedule_delayed_work(&bc->run_work, 1);
1043 netif_start_queue(dev);
1047 printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
1048 parport_write_control(pp, 0); /* reset the adapter */
1049 parport_release(bc->pdev);
1050 parport_unregister_device(bc->pdev);
1054 /* --------------------------------------------------------------------- */
1056 static int epp_close(struct net_device *dev)
1058 struct baycom_state *bc;
1060 unsigned char tmp[1];
1062 baycom_paranoia_check(dev, "epp_close", -EINVAL);
1063 bc = netdev_priv(dev);
1064 pp = bc->pdev->port;
1065 bc->work_running = 0;
1066 flush_scheduled_work();
1067 bc->stat = EPP_DCDBIT;
1069 pp->ops->epp_write_addr(pp, tmp, 1, 0);
1070 parport_write_control(pp, 0); /* reset the adapter */
1071 parport_release(bc->pdev);
1072 parport_unregister_device(bc->pdev);
1074 dev_kfree_skb(bc->skb);
1076 printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
1077 bc_drvname, dev->base_addr, dev->irq);
1081 /* --------------------------------------------------------------------- */
1083 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
1087 if (strstr(modestr,"intclk"))
1089 if (strstr(modestr,"extclk"))
1091 if (strstr(modestr,"intmodem"))
1092 bc->cfg.extmodem = 0;
1093 if (strstr(modestr,"extmodem"))
1094 bc->cfg.extmodem = 1;
1095 if (strstr(modestr,"noloopback"))
1096 bc->cfg.loopback = 0;
1097 if (strstr(modestr,"loopback"))
1098 bc->cfg.loopback = 1;
1099 if ((cp = strstr(modestr,"fclk="))) {
1100 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1101 if (bc->cfg.fclk < 1000000)
1102 bc->cfg.fclk = 1000000;
1103 if (bc->cfg.fclk > 25000000)
1104 bc->cfg.fclk = 25000000;
1106 if ((cp = strstr(modestr,"bps="))) {
1107 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1108 if (bc->cfg.bps < 1000)
1110 if (bc->cfg.bps > 1500000)
1111 bc->cfg.bps = 1500000;
1116 /* --------------------------------------------------------------------- */
1118 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1120 struct baycom_state *bc;
1121 struct hdlcdrv_ioctl hi;
1123 baycom_paranoia_check(dev, "baycom_ioctl", -EINVAL);
1124 bc = netdev_priv(dev);
1125 if (cmd != SIOCDEVPRIVATE)
1126 return -ENOIOCTLCMD;
1128 if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1132 return -ENOIOCTLCMD;
1134 case HDLCDRVCTL_GETCHANNELPAR:
1135 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1136 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1137 hi.data.cp.slottime = bc->ch_params.slottime;
1138 hi.data.cp.ppersist = bc->ch_params.ppersist;
1139 hi.data.cp.fulldup = bc->ch_params.fulldup;
1142 case HDLCDRVCTL_SETCHANNELPAR:
1143 if (!capable(CAP_NET_ADMIN))
1145 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1146 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1147 bc->ch_params.slottime = hi.data.cp.slottime;
1148 bc->ch_params.ppersist = hi.data.cp.ppersist;
1149 bc->ch_params.fulldup = hi.data.cp.fulldup;
1150 bc->hdlctx.slotcnt = 1;
1153 case HDLCDRVCTL_GETMODEMPAR:
1154 hi.data.mp.iobase = dev->base_addr;
1155 hi.data.mp.irq = dev->irq;
1156 hi.data.mp.dma = dev->dma;
1157 hi.data.mp.dma2 = 0;
1158 hi.data.mp.seriobase = 0;
1159 hi.data.mp.pariobase = 0;
1160 hi.data.mp.midiiobase = 0;
1163 case HDLCDRVCTL_SETMODEMPAR:
1164 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1166 dev->base_addr = hi.data.mp.iobase;
1167 dev->irq = /*hi.data.mp.irq*/0;
1168 dev->dma = /*hi.data.mp.dma*/0;
1171 case HDLCDRVCTL_GETSTAT:
1172 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1173 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1174 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1175 hi.data.cs.tx_packets = bc->stats.tx_packets;
1176 hi.data.cs.tx_errors = bc->stats.tx_errors;
1177 hi.data.cs.rx_packets = bc->stats.rx_packets;
1178 hi.data.cs.rx_errors = bc->stats.rx_errors;
1181 case HDLCDRVCTL_OLDGETSTAT:
1182 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1183 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1184 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1187 case HDLCDRVCTL_CALIBRATE:
1188 if (!capable(CAP_SYS_RAWIO))
1190 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1193 case HDLCDRVCTL_DRIVERNAME:
1194 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1197 case HDLCDRVCTL_GETMODE:
1198 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1199 bc->cfg.intclk ? "int" : "ext",
1200 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1201 bc->cfg.loopback ? ",loopback" : "");
1204 case HDLCDRVCTL_SETMODE:
1205 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1207 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1208 return baycom_setmode(bc, hi.data.modename);
1210 case HDLCDRVCTL_MODELIST:
1211 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1212 sizeof(hi.data.modename));
1215 case HDLCDRVCTL_MODEMPARMASK:
1216 return HDLCDRV_PARMASK_IOBASE;
1219 if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1224 /* --------------------------------------------------------------------- */
1227 * Check for a network adaptor of this type, and return '0' if one exists.
1228 * If dev->base_addr == 0, probe all likely locations.
1229 * If dev->base_addr == 1, always return failure.
1230 * If dev->base_addr == 2, allocate space for the device and return success
1231 * (detachable devices only).
1233 static void baycom_probe(struct net_device *dev)
1235 static char ax25_bcast[AX25_ADDR_LEN] = {
1236 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1
1238 static char ax25_nocall[AX25_ADDR_LEN] = {
1239 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1
1241 const struct hdlcdrv_channel_params dflt_ch_params = {
1244 struct baycom_state *bc;
1247 * not a real probe! only initialize data structures
1249 bc = netdev_priv(dev);
1251 * initialize the baycom_state struct
1253 bc->ch_params = dflt_ch_params;
1257 * initialize the device struct
1259 dev->open = epp_open;
1260 dev->stop = epp_close;
1261 dev->do_ioctl = baycom_ioctl;
1262 dev->hard_start_xmit = baycom_send_packet;
1263 dev->get_stats = baycom_get_stats;
1265 /* Fill in the fields of the device structure */
1268 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
1269 dev->hard_header = ax25_encapsulate;
1270 dev->rebuild_header = ax25_rebuild_header;
1271 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1272 dev->hard_header = NULL;
1273 dev->rebuild_header = NULL;
1274 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1275 dev->set_mac_address = baycom_set_mac_address;
1277 dev->type = ARPHRD_AX25; /* AF_AX25 device */
1278 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1279 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
1280 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
1281 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
1282 memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
1283 dev->tx_queue_len = 16;
1285 /* New style flags */
1289 /* --------------------------------------------------------------------- */
1292 * command line settable parameters
1294 static const char *mode[NR_PORTS] = { "", };
1295 static int iobase[NR_PORTS] = { 0x378, };
1297 MODULE_PARM(mode, "1-" __MODULE_STRING(NR_PORTS) "s");
1298 MODULE_PARM_DESC(mode, "baycom operating mode");
1299 MODULE_PARM(iobase, "1-" __MODULE_STRING(NR_PORTS) "i");
1300 MODULE_PARM_DESC(iobase, "baycom io base address");
1302 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1303 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1304 MODULE_LICENSE("GPL");
1306 /* --------------------------------------------------------------------- */
1308 static void __init baycom_epp_dev_setup(struct net_device *dev)
1310 struct baycom_state *bc = netdev_priv(dev);
1313 * initialize part of the baycom_state struct
1315 bc->magic = BAYCOM_MAGIC;
1316 bc->cfg.fclk = 19666600;
1319 * initialize part of the device struct
1324 static int __init init_baycomepp(void)
1331 * register net devices
1333 for (i = 0; i < NR_PORTS; i++) {
1334 struct net_device *dev;
1336 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1337 baycom_epp_dev_setup);
1340 printk(KERN_WARNING "bce%d : out of memory\n", i);
1341 return found ? 0 : -ENOMEM;
1344 sprintf(dev->name, "bce%d", i);
1345 dev->base_addr = iobase[i];
1352 if (register_netdev(dev)) {
1353 printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1357 if (set_hw && baycom_setmode(dev->priv, mode[i]))
1359 baycom_device[i] = dev;
1363 return found ? 0 : -ENXIO;
1366 static void __exit cleanup_baycomepp(void)
1370 for(i = 0; i < NR_PORTS; i++) {
1371 struct net_device *dev = baycom_device[i];
1374 struct baycom_state *bc = netdev_priv(dev);
1375 if (bc->magic == BAYCOM_MAGIC) {
1376 unregister_netdev(dev);
1379 printk(paranoia_str, "cleanup_module");
1384 module_init(init_baycomepp);
1385 module_exit(cleanup_baycomepp);
1387 /* --------------------------------------------------------------------- */
1392 * format: baycom_epp=io,mode
1393 * mode: fpga config options
1396 static int __init baycom_epp_setup(char *str)
1398 static unsigned __initdata nr_dev = 0;
1401 if (nr_dev >= NR_PORTS)
1403 str = get_options(str, 2, ints);
1407 iobase[nr_dev] = ints[1];
1412 __setup("baycom_epp=", baycom_epp_setup);
1415 /* --------------------------------------------------------------------- */