Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /*****************************************************************************/ |
2 | ||
3 | /* | |
4 | * baycom_epp.c -- baycom epp radio modem driver. | |
5 | * | |
6 | * Copyright (C) 1998-2000 | |
7 | * Thomas Sailer (sailer@ife.ee.ethz.ch) | |
8 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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. | |
22 | * | |
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. | |
26 | * | |
27 | * | |
28 | * History: | |
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 | |
38 | * | |
39 | */ | |
40 | ||
41 | /*****************************************************************************/ | |
42 | ||
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> | |
49 | #include <linux/fs.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 */ | |
59 | #include <net/ax25.h> | |
60 | #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */ | |
61 | #include <linux/crc-ccitt.h> | |
62 | ||
63 | /* --------------------------------------------------------------------- */ | |
64 | ||
65 | #define BAYCOM_DEBUG | |
66 | #define BAYCOM_MAGIC 19730510 | |
67 | ||
68 | /* --------------------------------------------------------------------- */ | |
69 | ||
70 | static const char paranoia_str[] = KERN_ERR | |
71 | "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n"; | |
72 | ||
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"; | |
76 | ||
77 | /* --------------------------------------------------------------------- */ | |
78 | ||
79 | #define NR_PORTS 4 | |
80 | ||
81 | static struct net_device *baycom_device[NR_PORTS]; | |
82 | ||
83 | /* --------------------------------------------------------------------- */ | |
84 | ||
85 | /* EPP status register */ | |
86 | #define EPP_DCDBIT 0x80 | |
87 | #define EPP_PTTBIT 0x08 | |
88 | #define EPP_NREF 0x01 | |
89 | #define EPP_NRAEF 0x02 | |
90 | #define EPP_NRHF 0x04 | |
91 | #define EPP_NTHF 0x20 | |
92 | #define EPP_NTAEF 0x10 | |
93 | #define EPP_NTEF EPP_PTTBIT | |
94 | ||
95 | /* EPP control register */ | |
96 | #define EPP_TX_FIFO_ENABLE 0x10 | |
97 | #define EPP_RX_FIFO_ENABLE 0x08 | |
98 | #define EPP_MODEM_ENABLE 0x20 | |
99 | #define EPP_LEDS 0xC0 | |
100 | #define EPP_IRQ_ENABLE 0x10 | |
101 | ||
102 | /* LPT registers */ | |
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 | |
111 | ||
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 | |
118 | ||
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 | |
127 | ||
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 | |
135 | ||
136 | ||
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 | |
143 | ||
144 | #define EPP_NTHF 0x20 | |
145 | #define EPP_NTAEF 0x10 | |
146 | #define EPP_NTEF EPP_PTTBIT | |
147 | ||
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 | |
153 | ||
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 | |
160 | ||
161 | #define EPP_CONVENTIONAL 0 | |
162 | #define EPP_FPGA 1 | |
163 | #define EPP_FPGAEXTSTATUS 2 | |
164 | ||
165 | #define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8) | |
166 | ||
167 | /* ---------------------------------------------------------------------- */ | |
168 | /* | |
169 | * Information that need to be kept for each board. | |
170 | */ | |
171 | ||
172 | struct baycom_state { | |
173 | int magic; | |
174 | ||
175 | struct pardevice *pdev; | |
176 | unsigned int work_running; | |
177 | struct work_struct run_work; | |
178 | unsigned int modem; | |
179 | unsigned int bitrate; | |
180 | unsigned char stat; | |
181 | ||
182 | struct { | |
183 | unsigned int intclk; | |
184 | unsigned int fclk; | |
185 | unsigned int bps; | |
186 | unsigned int extmodem; | |
187 | unsigned int loopback; | |
188 | } cfg; | |
189 | ||
190 | struct hdlcdrv_channel_params ch_params; | |
191 | ||
192 | struct { | |
193 | unsigned int bitbuf, bitstream, numbits, state; | |
194 | unsigned char *bufptr; | |
195 | int bufcnt; | |
196 | unsigned char buf[TXBUFFER_SIZE]; | |
197 | } hdlcrx; | |
198 | ||
199 | struct { | |
200 | int calibrate; | |
201 | int slotcnt; | |
202 | int flags; | |
203 | enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state; | |
204 | unsigned char *bufptr; | |
205 | int bufcnt; | |
206 | unsigned char buf[TXBUFFER_SIZE]; | |
207 | } hdlctx; | |
208 | ||
209 | struct net_device_stats stats; | |
210 | unsigned int ptt_keyed; | |
211 | struct sk_buff *skb; /* next transmit packet */ | |
212 | ||
213 | #ifdef BAYCOM_DEBUG | |
214 | struct debug_vals { | |
215 | unsigned long last_jiffies; | |
216 | unsigned cur_intcnt; | |
217 | unsigned last_intcnt; | |
218 | int cur_pllcorr; | |
219 | int last_pllcorr; | |
220 | unsigned int mod_cycles; | |
221 | unsigned int demod_cycles; | |
222 | } debug_vals; | |
223 | #endif /* BAYCOM_DEBUG */ | |
224 | }; | |
225 | ||
226 | /* --------------------------------------------------------------------- */ | |
227 | ||
228 | #define KISS_VERBOSE | |
229 | ||
230 | /* --------------------------------------------------------------------- */ | |
231 | ||
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 | |
239 | ||
240 | /* --------------------------------------------------------------------- */ | |
241 | /* | |
242 | * the CRC routines are stolen from WAMPES | |
243 | * by Dieter Deyke | |
244 | */ | |
245 | ||
246 | ||
247 | /*---------------------------------------------------------------------------*/ | |
248 | ||
249 | #if 0 | |
250 | static inline void append_crc_ccitt(unsigned char *buffer, int len) | |
251 | { | |
252 | unsigned int crc = 0xffff; | |
253 | ||
254 | for (;len>0;len--) | |
255 | crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff]; | |
256 | crc ^= 0xffff; | |
257 | *buffer++ = crc; | |
258 | *buffer++ = crc >> 8; | |
259 | } | |
260 | #endif | |
261 | ||
262 | /*---------------------------------------------------------------------------*/ | |
263 | ||
264 | static inline int check_crc_ccitt(const unsigned char *buf, int cnt) | |
265 | { | |
266 | return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; | |
267 | } | |
268 | ||
269 | /*---------------------------------------------------------------------------*/ | |
270 | ||
271 | static inline int calc_crc_ccitt(const unsigned char *buf, int cnt) | |
272 | { | |
273 | return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff; | |
274 | } | |
275 | ||
276 | /* ---------------------------------------------------------------------- */ | |
277 | ||
278 | #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800) | |
279 | ||
280 | /* --------------------------------------------------------------------- */ | |
281 | ||
282 | static inline void baycom_int_freq(struct baycom_state *bc) | |
283 | { | |
284 | #ifdef BAYCOM_DEBUG | |
285 | unsigned long cur_jiffies = jiffies; | |
286 | /* | |
287 | * measure the interrupt frequency | |
288 | */ | |
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; | |
296 | } | |
297 | #endif /* BAYCOM_DEBUG */ | |
298 | } | |
299 | ||
300 | /* ---------------------------------------------------------------------- */ | |
301 | /* | |
302 | * eppconfig_path should be setable via /proc/sys. | |
303 | */ | |
304 | ||
305 | static char eppconfig_path[256] = "/usr/sbin/eppfpga"; | |
306 | ||
307 | static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL }; | |
308 | ||
309 | /* eppconfig: called during ifconfig up to configure the modem */ | |
310 | static int eppconfig(struct baycom_state *bc) | |
311 | { | |
312 | char modearg[256]; | |
313 | char portarg[16]; | |
314 | char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg, | |
315 | NULL }; | |
316 | ||
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); | |
325 | ||
326 | return call_usermodehelper(eppconfig_path, argv, envp, 1); | |
327 | } | |
328 | ||
329 | /* ---------------------------------------------------------------------- */ | |
330 | ||
331 | static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
332 | { | |
333 | } | |
334 | ||
335 | /* ---------------------------------------------------------------------- */ | |
336 | ||
337 | static inline void do_kiss_params(struct baycom_state *bc, | |
338 | unsigned char *data, unsigned long len) | |
339 | { | |
340 | ||
341 | #ifdef KISS_VERBOSE | |
342 | #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b) | |
343 | #else /* KISS_VERBOSE */ | |
344 | #define PKP(a,b) | |
345 | #endif /* KISS_VERBOSE */ | |
346 | ||
347 | if (len < 2) | |
348 | return; | |
349 | switch(data[0]) { | |
350 | case PARAM_TXDELAY: | |
351 | bc->ch_params.tx_delay = data[1]; | |
352 | PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay); | |
353 | break; | |
354 | case PARAM_PERSIST: | |
355 | bc->ch_params.ppersist = data[1]; | |
356 | PKP("p persistence = %u", bc->ch_params.ppersist); | |
357 | break; | |
358 | case PARAM_SLOTTIME: | |
359 | bc->ch_params.slottime = data[1]; | |
360 | PKP("slot time = %ums", bc->ch_params.slottime); | |
361 | break; | |
362 | case PARAM_TXTAIL: | |
363 | bc->ch_params.tx_tail = data[1]; | |
364 | PKP("TX tail = %ums", bc->ch_params.tx_tail); | |
365 | break; | |
366 | case PARAM_FULLDUP: | |
367 | bc->ch_params.fulldup = !!data[1]; | |
368 | PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half"); | |
369 | break; | |
370 | default: | |
371 | break; | |
372 | } | |
373 | #undef PKP | |
374 | } | |
375 | ||
376 | /* --------------------------------------------------------------------- */ | |
377 | /* | |
378 | * high performance HDLC encoder | |
379 | * yes, it's ugly, but generates pretty good code | |
380 | */ | |
381 | ||
382 | #define ENCODEITERA(j) \ | |
383 | ({ \ | |
384 | if (!(notbitstream & (0x1f0 << j))) \ | |
385 | goto stuff##j; \ | |
386 | encodeend##j: ; \ | |
387 | }) | |
388 | ||
389 | #define ENCODEITERB(j) \ | |
390 | ({ \ | |
391 | stuff##j: \ | |
392 | bitstream &= ~(0x100 << j); \ | |
393 | bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) | \ | |
394 | ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1); \ | |
395 | numbit++; \ | |
396 | notbitstream = ~bitstream; \ | |
397 | goto encodeend##j; \ | |
398 | }) | |
399 | ||
400 | ||
401 | static void encode_hdlc(struct baycom_state *bc) | |
402 | { | |
403 | struct sk_buff *skb; | |
404 | unsigned char *wp, *bp; | |
405 | int pkt_len; | |
406 | unsigned bitstream, notbitstream, bitbuf, numbit, crc; | |
407 | unsigned char crcarr[2]; | |
408 | ||
409 | if (bc->hdlctx.bufcnt > 0) | |
410 | return; | |
411 | skb = bc->skb; | |
412 | if (!skb) | |
413 | return; | |
414 | bc->skb = NULL; | |
415 | pkt_len = skb->len-1; /* strip KISS byte */ | |
416 | wp = bc->hdlctx.buf; | |
417 | bp = skb->data+1; | |
418 | crc = calc_crc_ccitt(bp, pkt_len); | |
419 | crcarr[0] = crc; | |
420 | crcarr[1] = crc >> 8; | |
421 | *wp++ = 0x7e; | |
422 | bitstream = bitbuf = numbit = 0; | |
423 | while (pkt_len > -2) { | |
424 | bitstream >>= 8; | |
425 | bitstream |= ((unsigned int)*bp) << 8; | |
426 | bitbuf |= ((unsigned int)*bp) << numbit; | |
427 | notbitstream = ~bitstream; | |
428 | bp++; | |
429 | pkt_len--; | |
430 | if (!pkt_len) | |
431 | bp = crcarr; | |
432 | ENCODEITERA(0); | |
433 | ENCODEITERA(1); | |
434 | ENCODEITERA(2); | |
435 | ENCODEITERA(3); | |
436 | ENCODEITERA(4); | |
437 | ENCODEITERA(5); | |
438 | ENCODEITERA(6); | |
439 | ENCODEITERA(7); | |
440 | goto enditer; | |
441 | ENCODEITERB(0); | |
442 | ENCODEITERB(1); | |
443 | ENCODEITERB(2); | |
444 | ENCODEITERB(3); | |
445 | ENCODEITERB(4); | |
446 | ENCODEITERB(5); | |
447 | ENCODEITERB(6); | |
448 | ENCODEITERB(7); | |
449 | enditer: | |
450 | numbit += 8; | |
451 | while (numbit >= 8) { | |
452 | *wp++ = bitbuf; | |
453 | bitbuf >>= 8; | |
454 | numbit -= 8; | |
455 | } | |
456 | } | |
457 | bitbuf |= 0x7e7e << numbit; | |
458 | numbit += 16; | |
459 | while (numbit >= 8) { | |
460 | *wp++ = bitbuf; | |
461 | bitbuf >>= 8; | |
462 | numbit -= 8; | |
463 | } | |
464 | bc->hdlctx.bufptr = bc->hdlctx.buf; | |
465 | bc->hdlctx.bufcnt = wp - bc->hdlctx.buf; | |
466 | dev_kfree_skb(skb); | |
467 | bc->stats.tx_packets++; | |
468 | } | |
469 | ||
470 | /* ---------------------------------------------------------------------- */ | |
471 | ||
472 | static unsigned short random_seed; | |
473 | ||
474 | static inline unsigned short random_num(void) | |
475 | { | |
476 | random_seed = 28629 * random_seed + 157; | |
477 | return random_seed; | |
478 | } | |
479 | ||
480 | /* ---------------------------------------------------------------------- */ | |
481 | ||
482 | static int transmit(struct baycom_state *bc, int cnt, unsigned char stat) | |
483 | { | |
484 | struct parport *pp = bc->pdev->port; | |
485 | unsigned char tmp[128]; | |
486 | int i, j; | |
487 | ||
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) | |
492 | encode_hdlc(bc); | |
493 | if (bc->hdlctx.bufcnt <= 0) | |
494 | return 0; | |
495 | if (!bc->ch_params.fulldup) { | |
496 | if (!(stat & EPP_DCDBIT)) { | |
497 | bc->hdlctx.slotcnt = bc->ch_params.slottime; | |
498 | return 0; | |
499 | } | |
500 | if ((--bc->hdlctx.slotcnt) > 0) | |
501 | return 0; | |
502 | bc->hdlctx.slotcnt = bc->ch_params.slottime; | |
503 | if ((random_num() % 256) > bc->ch_params.ppersist) | |
504 | return 0; | |
505 | } | |
506 | } | |
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); | |
510 | bc->ptt_keyed++; | |
511 | } | |
512 | while (cnt > 0) { | |
513 | switch (bc->hdlctx.state) { | |
514 | case tx_keyup: | |
515 | i = min_t(int, cnt, bc->hdlctx.flags); | |
516 | cnt -= i; | |
517 | bc->hdlctx.flags -= i; | |
518 | if (bc->hdlctx.flags <= 0) | |
519 | bc->hdlctx.state = tx_data; | |
520 | memset(tmp, 0x7e, sizeof(tmp)); | |
521 | while (i > 0) { | |
522 | j = (i > sizeof(tmp)) ? sizeof(tmp) : i; | |
523 | if (j != pp->ops->epp_write_data(pp, tmp, j, 0)) | |
524 | return -1; | |
525 | i -= j; | |
526 | } | |
527 | break; | |
528 | ||
529 | case tx_data: | |
530 | if (bc->hdlctx.bufcnt <= 0) { | |
531 | encode_hdlc(bc); | |
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); | |
535 | break; | |
536 | } | |
537 | } | |
538 | i = min_t(int, cnt, bc->hdlctx.bufcnt); | |
539 | bc->hdlctx.bufcnt -= i; | |
540 | cnt -= i; | |
541 | if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0)) | |
542 | return -1; | |
543 | bc->hdlctx.bufptr += i; | |
544 | break; | |
545 | ||
546 | case tx_tail: | |
547 | encode_hdlc(bc); | |
548 | if (bc->hdlctx.bufcnt > 0) { | |
549 | bc->hdlctx.state = tx_data; | |
550 | break; | |
551 | } | |
552 | i = min_t(int, cnt, bc->hdlctx.flags); | |
553 | if (i) { | |
554 | cnt -= i; | |
555 | bc->hdlctx.flags -= i; | |
556 | memset(tmp, 0x7e, sizeof(tmp)); | |
557 | while (i > 0) { | |
558 | j = (i > sizeof(tmp)) ? sizeof(tmp) : i; | |
559 | if (j != pp->ops->epp_write_data(pp, tmp, j, 0)) | |
560 | return -1; | |
561 | i -= j; | |
562 | } | |
563 | break; | |
564 | } | |
565 | ||
566 | default: /* fall through */ | |
567 | if (bc->hdlctx.calibrate <= 0) | |
568 | return 0; | |
569 | i = min_t(int, cnt, bc->hdlctx.calibrate); | |
570 | cnt -= i; | |
571 | bc->hdlctx.calibrate -= i; | |
572 | memset(tmp, 0, sizeof(tmp)); | |
573 | while (i > 0) { | |
574 | j = (i > sizeof(tmp)) ? sizeof(tmp) : i; | |
575 | if (j != pp->ops->epp_write_data(pp, tmp, j, 0)) | |
576 | return -1; | |
577 | i -= j; | |
578 | } | |
579 | break; | |
580 | } | |
581 | } | |
582 | return 0; | |
583 | } | |
584 | ||
585 | /* ---------------------------------------------------------------------- */ | |
586 | ||
587 | static void do_rxpacket(struct net_device *dev) | |
588 | { | |
589 | struct baycom_state *bc = netdev_priv(dev); | |
590 | struct sk_buff *skb; | |
591 | unsigned char *cp; | |
592 | unsigned pktlen; | |
593 | ||
594 | if (bc->hdlcrx.bufcnt < 4) | |
595 | return; | |
596 | if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt)) | |
597 | return; | |
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++; | |
602 | return; | |
603 | } | |
1da177e4 LT |
604 | cp = skb_put(skb, pktlen); |
605 | *cp++ = 0; /* KISS kludge */ | |
606 | memcpy(cp, bc->hdlcrx.buf, pktlen - 1); | |
56cb5156 | 607 | skb->protocol = ax25_type_trans(skb, dev); |
1da177e4 LT |
608 | netif_rx(skb); |
609 | dev->last_rx = jiffies; | |
610 | bc->stats.rx_packets++; | |
611 | } | |
612 | ||
613 | #define DECODEITERA(j) \ | |
614 | ({ \ | |
615 | if (!(notbitstream & (0x0fc << j))) /* flag or abort */ \ | |
616 | goto flgabrt##j; \ | |
617 | if ((bitstream & (0x1f8 << j)) == (0xf8 << j)) /* stuffed bit */ \ | |
618 | goto stuff##j; \ | |
619 | enditer##j: ; \ | |
620 | }) | |
621 | ||
622 | #define DECODEITERB(j) \ | |
623 | ({ \ | |
624 | flgabrt##j: \ | |
625 | if (!(notbitstream & (0x1fc << j))) { /* abort received */ \ | |
626 | state = 0; \ | |
627 | goto enditer##j; \ | |
628 | } \ | |
629 | if ((bitstream & (0x1fe << j)) != (0x0fc << j)) /* flag received */ \ | |
630 | goto enditer##j; \ | |
631 | if (state) \ | |
632 | do_rxpacket(dev); \ | |
633 | bc->hdlcrx.bufcnt = 0; \ | |
634 | bc->hdlcrx.bufptr = bc->hdlcrx.buf; \ | |
635 | state = 1; \ | |
636 | numbits = 7-j; \ | |
637 | goto enditer##j; \ | |
638 | stuff##j: \ | |
639 | numbits--; \ | |
640 | bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1); \ | |
641 | goto enditer##j; \ | |
642 | }) | |
643 | ||
644 | static int receive(struct net_device *dev, int cnt) | |
645 | { | |
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]; | |
650 | unsigned char *cp; | |
651 | int cnt2, ret = 0; | |
652 | ||
653 | numbits = bc->hdlcrx.numbits; | |
654 | state = bc->hdlcrx.state; | |
655 | bitstream = bc->hdlcrx.bitstream; | |
656 | bitbuf = bc->hdlcrx.bitbuf; | |
657 | while (cnt > 0) { | |
658 | cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt; | |
659 | cnt -= cnt2; | |
660 | if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) { | |
661 | ret = -1; | |
662 | break; | |
663 | } | |
664 | cp = tmp; | |
665 | for (; cnt2 > 0; cnt2--, cp++) { | |
666 | bitstream >>= 8; | |
667 | bitstream |= (*cp) << 8; | |
668 | bitbuf >>= 8; | |
669 | bitbuf |= (*cp) << 8; | |
670 | numbits += 8; | |
671 | notbitstream = ~bitstream; | |
672 | DECODEITERA(0); | |
673 | DECODEITERA(1); | |
674 | DECODEITERA(2); | |
675 | DECODEITERA(3); | |
676 | DECODEITERA(4); | |
677 | DECODEITERA(5); | |
678 | DECODEITERA(6); | |
679 | DECODEITERA(7); | |
680 | goto enddec; | |
681 | DECODEITERB(0); | |
682 | DECODEITERB(1); | |
683 | DECODEITERB(2); | |
684 | DECODEITERB(3); | |
685 | DECODEITERB(4); | |
686 | DECODEITERB(5); | |
687 | DECODEITERB(6); | |
688 | DECODEITERB(7); | |
689 | enddec: | |
690 | while (state && numbits >= 8) { | |
691 | if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) { | |
692 | state = 0; | |
693 | } else { | |
694 | *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits); | |
695 | bc->hdlcrx.bufcnt++; | |
696 | numbits -= 8; | |
697 | } | |
698 | } | |
699 | } | |
700 | } | |
701 | bc->hdlcrx.numbits = numbits; | |
702 | bc->hdlcrx.state = state; | |
703 | bc->hdlcrx.bitstream = bitstream; | |
704 | bc->hdlcrx.bitbuf = bitbuf; | |
705 | return ret; | |
706 | } | |
707 | ||
708 | /* --------------------------------------------------------------------- */ | |
709 | ||
710 | #ifdef __i386__ | |
711 | #include <asm/msr.h> | |
712 | #define GETTICK(x) \ | |
713 | ({ \ | |
714 | if (cpu_has_tsc) \ | |
715 | rdtscl(x); \ | |
716 | }) | |
717 | #else /* __i386__ */ | |
718 | #define GETTICK(x) | |
719 | #endif /* __i386__ */ | |
720 | ||
721 | static void epp_bh(struct net_device *dev) | |
722 | { | |
723 | struct baycom_state *bc; | |
724 | struct parport *pp; | |
725 | unsigned char stat; | |
726 | unsigned char tmp[2]; | |
727 | unsigned int time1 = 0, time2 = 0, time3 = 0; | |
728 | int cnt, cnt2; | |
729 | ||
730 | bc = netdev_priv(dev); | |
731 | if (!bc->work_running) | |
732 | return; | |
733 | baycom_int_freq(bc); | |
734 | pp = bc->pdev->port; | |
735 | /* update status */ | |
736 | if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) | |
737 | goto epptimeout; | |
738 | bc->stat = stat; | |
739 | bc->debug_vals.last_pllcorr = stat; | |
740 | GETTICK(time1); | |
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) | |
745 | goto epptimeout; | |
746 | if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2) | |
747 | goto epptimeout; | |
748 | cnt = tmp[0] | (tmp[1] << 8); | |
749 | cnt &= 0x7fff; | |
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) | |
753 | goto epptimeout; | |
754 | if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2) | |
755 | goto epptimeout; | |
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) | |
761 | goto epptimeout; | |
762 | if (transmit(bc, cnt2, stat)) | |
763 | goto epptimeout; | |
764 | GETTICK(time2); | |
765 | if (receive(dev, cnt)) | |
766 | goto epptimeout; | |
767 | if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) | |
768 | goto epptimeout; | |
769 | bc->stat = stat; | |
770 | } else { | |
771 | /* try to tx */ | |
772 | switch (stat & (EPP_NTAEF|EPP_NTHF)) { | |
773 | case EPP_NTHF: | |
774 | cnt = 2048 - 256; | |
775 | break; | |
776 | ||
777 | case EPP_NTAEF: | |
778 | cnt = 2048 - 1793; | |
779 | break; | |
780 | ||
781 | case 0: | |
782 | cnt = 0; | |
783 | break; | |
784 | ||
785 | default: | |
786 | cnt = 2048 - 1025; | |
787 | break; | |
788 | } | |
789 | if (transmit(bc, cnt, stat)) | |
790 | goto epptimeout; | |
791 | GETTICK(time2); | |
792 | /* do receiver */ | |
793 | while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) { | |
794 | switch (stat & (EPP_NRAEF|EPP_NRHF)) { | |
795 | case EPP_NRAEF: | |
796 | cnt = 1025; | |
797 | break; | |
798 | ||
799 | case 0: | |
800 | cnt = 1793; | |
801 | break; | |
802 | ||
803 | default: | |
804 | cnt = 256; | |
805 | break; | |
806 | } | |
807 | if (receive(dev, cnt)) | |
808 | goto epptimeout; | |
809 | if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) | |
810 | goto epptimeout; | |
811 | } | |
812 | cnt = 0; | |
813 | if (bc->bitrate < 50000) | |
814 | cnt = 256; | |
815 | else if (bc->bitrate < 100000) | |
816 | cnt = 128; | |
817 | while (cnt > 0 && stat & EPP_NREF) { | |
818 | if (receive(dev, 1)) | |
819 | goto epptimeout; | |
820 | cnt--; | |
821 | if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) | |
822 | goto epptimeout; | |
823 | } | |
824 | } | |
825 | GETTICK(time3); | |
826 | #ifdef BAYCOM_DEBUG | |
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); | |
831 | if (!bc->skb) | |
832 | netif_wake_queue(dev); | |
833 | return; | |
834 | epptimeout: | |
835 | printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname); | |
836 | } | |
837 | ||
838 | /* ---------------------------------------------------------------------- */ | |
839 | /* | |
840 | * ===================== network driver interface ========================= | |
841 | */ | |
842 | ||
843 | static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev) | |
844 | { | |
845 | struct baycom_state *bc = netdev_priv(dev); | |
846 | ||
847 | if (skb->data[0] != 0) { | |
848 | do_kiss_params(bc, skb->data, skb->len); | |
849 | dev_kfree_skb(skb); | |
850 | return 0; | |
851 | } | |
852 | if (bc->skb) | |
853 | return -1; | |
854 | /* strip KISS byte */ | |
855 | if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) { | |
856 | dev_kfree_skb(skb); | |
857 | return 0; | |
858 | } | |
859 | netif_stop_queue(dev); | |
860 | bc->skb = skb; | |
861 | return 0; | |
862 | } | |
863 | ||
864 | /* --------------------------------------------------------------------- */ | |
865 | ||
866 | static int baycom_set_mac_address(struct net_device *dev, void *addr) | |
867 | { | |
868 | struct sockaddr *sa = (struct sockaddr *)addr; | |
869 | ||
870 | /* addr is an AX.25 shifted ASCII mac address */ | |
871 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
872 | return 0; | |
873 | } | |
874 | ||
875 | /* --------------------------------------------------------------------- */ | |
876 | ||
877 | static struct net_device_stats *baycom_get_stats(struct net_device *dev) | |
878 | { | |
879 | struct baycom_state *bc = netdev_priv(dev); | |
880 | ||
881 | /* | |
882 | * Get the current statistics. This may be called with the | |
883 | * card open or closed. | |
884 | */ | |
885 | return &bc->stats; | |
886 | } | |
887 | ||
888 | /* --------------------------------------------------------------------- */ | |
889 | ||
890 | static void epp_wakeup(void *handle) | |
891 | { | |
892 | struct net_device *dev = (struct net_device *)handle; | |
893 | struct baycom_state *bc = netdev_priv(dev); | |
894 | ||
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); | |
898 | } | |
899 | ||
900 | /* --------------------------------------------------------------------- */ | |
901 | ||
902 | /* | |
903 | * Open/initialize the board. This is called (in the current kernel) | |
904 | * sometime after booting when the 'ifconfig' program is run. | |
905 | * | |
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. | |
909 | */ | |
910 | ||
911 | static int epp_open(struct net_device *dev) | |
912 | { | |
913 | struct baycom_state *bc = netdev_priv(dev); | |
914 | struct parport *pp = parport_find_base(dev->base_addr); | |
915 | unsigned int i, j; | |
916 | unsigned char tmp[128]; | |
917 | unsigned char stat; | |
918 | unsigned long tstart; | |
919 | ||
920 | if (!pp) { | |
921 | printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr); | |
922 | return -ENXIO; | |
923 | } | |
924 | #if 0 | |
925 | if (pp->irq < 0) { | |
926 | printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base); | |
927 | parport_put_port(pp); | |
928 | return -ENXIO; | |
929 | } | |
930 | #endif | |
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); | |
935 | return -EIO; | |
936 | } | |
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); | |
941 | if (!bc->pdev) { | |
942 | printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base); | |
943 | return -ENXIO; | |
944 | } | |
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); | |
948 | return -EBUSY; | |
949 | } | |
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; | |
954 | if (eppconfig(bc)) | |
955 | printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname); | |
956 | else | |
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 */ | |
960 | tmp[0] = 0; | |
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) | |
963 | goto epptimeout; | |
964 | /* autoprobe baud rate */ | |
965 | tstart = jiffies; | |
966 | i = 0; | |
967 | while ((signed)(jiffies-tstart-HZ/3) < 0) { | |
968 | if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) | |
969 | goto epptimeout; | |
970 | if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) { | |
971 | schedule(); | |
972 | continue; | |
973 | } | |
974 | if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128) | |
975 | goto epptimeout; | |
976 | if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128) | |
977 | goto epptimeout; | |
978 | i += 256; | |
979 | } | |
980 | for (j = 0; j < 256; j++) { | |
981 | if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1) | |
982 | goto epptimeout; | |
983 | if (!(stat & EPP_NREF)) | |
984 | break; | |
985 | if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1) | |
986 | goto epptimeout; | |
987 | i++; | |
988 | } | |
989 | tstart = jiffies - tstart; | |
990 | bc->bitrate = i * (8 * HZ) / tstart; | |
991 | j = 1; | |
992 | i = bc->bitrate >> 3; | |
993 | while (j < 7 && i > 150) { | |
994 | j++; | |
995 | i >>= 1; | |
996 | } | |
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) | |
1001 | goto epptimeout; | |
1002 | /* | |
1003 | * initialise hdlc variables | |
1004 | */ | |
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); | |
1014 | return 0; | |
1015 | ||
1016 | epptimeout: | |
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); | |
1021 | return -EIO; | |
1022 | } | |
1023 | ||
1024 | /* --------------------------------------------------------------------- */ | |
1025 | ||
1026 | static int epp_close(struct net_device *dev) | |
1027 | { | |
1028 | struct baycom_state *bc = netdev_priv(dev); | |
1029 | struct parport *pp = bc->pdev->port; | |
1030 | unsigned char tmp[1]; | |
1031 | ||
1032 | bc->work_running = 0; | |
1033 | flush_scheduled_work(); | |
1034 | bc->stat = EPP_DCDBIT; | |
1035 | tmp[0] = 0; | |
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); | |
1040 | if (bc->skb) | |
1041 | dev_kfree_skb(bc->skb); | |
1042 | bc->skb = NULL; | |
1043 | printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n", | |
1044 | bc_drvname, dev->base_addr, dev->irq); | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | /* --------------------------------------------------------------------- */ | |
1049 | ||
1050 | static int baycom_setmode(struct baycom_state *bc, const char *modestr) | |
1051 | { | |
1052 | const char *cp; | |
1053 | ||
1054 | if (strstr(modestr,"intclk")) | |
1055 | bc->cfg.intclk = 1; | |
1056 | if (strstr(modestr,"extclk")) | |
1057 | bc->cfg.intclk = 0; | |
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; | |
1072 | } | |
1073 | if ((cp = strstr(modestr,"bps="))) { | |
1074 | bc->cfg.bps = simple_strtoul(cp+4, NULL, 0); | |
1075 | if (bc->cfg.bps < 1000) | |
1076 | bc->cfg.bps = 1000; | |
1077 | if (bc->cfg.bps > 1500000) | |
1078 | bc->cfg.bps = 1500000; | |
1079 | } | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | /* --------------------------------------------------------------------- */ | |
1084 | ||
1085 | static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1086 | { | |
1087 | struct baycom_state *bc = netdev_priv(dev); | |
1088 | struct hdlcdrv_ioctl hi; | |
1089 | ||
1090 | if (cmd != SIOCDEVPRIVATE) | |
1091 | return -ENOIOCTLCMD; | |
1092 | ||
1093 | if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi))) | |
1094 | return -EFAULT; | |
1095 | switch (hi.cmd) { | |
1096 | default: | |
1097 | return -ENOIOCTLCMD; | |
1098 | ||
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; | |
1105 | break; | |
1106 | ||
1107 | case HDLCDRVCTL_SETCHANNELPAR: | |
1108 | if (!capable(CAP_NET_ADMIN)) | |
1109 | return -EACCES; | |
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; | |
1116 | return 0; | |
1117 | ||
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; | |
1126 | break; | |
1127 | ||
1128 | case HDLCDRVCTL_SETMODEMPAR: | |
1129 | if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) | |
1130 | return -EACCES; | |
1131 | dev->base_addr = hi.data.mp.iobase; | |
1132 | dev->irq = /*hi.data.mp.irq*/0; | |
1133 | dev->dma = /*hi.data.mp.dma*/0; | |
1134 | return 0; | |
1135 | ||
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; | |
1144 | break; | |
1145 | ||
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; | |
1150 | break; | |
1151 | ||
1152 | case HDLCDRVCTL_CALIBRATE: | |
1153 | if (!capable(CAP_SYS_RAWIO)) | |
1154 | return -EACCES; | |
1155 | bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8; | |
1156 | return 0; | |
1157 | ||
1158 | case HDLCDRVCTL_DRIVERNAME: | |
1159 | strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername)); | |
1160 | break; | |
1161 | ||
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" : ""); | |
1167 | break; | |
1168 | ||
1169 | case HDLCDRVCTL_SETMODE: | |
1170 | if (!capable(CAP_NET_ADMIN) || netif_running(dev)) | |
1171 | return -EACCES; | |
1172 | hi.data.modename[sizeof(hi.data.modename)-1] = '\0'; | |
1173 | return baycom_setmode(bc, hi.data.modename); | |
1174 | ||
1175 | case HDLCDRVCTL_MODELIST: | |
1176 | strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x", | |
1177 | sizeof(hi.data.modename)); | |
1178 | break; | |
1179 | ||
1180 | case HDLCDRVCTL_MODEMPARMASK: | |
1181 | return HDLCDRV_PARMASK_IOBASE; | |
1182 | ||
1183 | } | |
1184 | if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi))) | |
1185 | return -EFAULT; | |
1186 | return 0; | |
1187 | } | |
1188 | ||
1189 | /* --------------------------------------------------------------------- */ | |
1190 | ||
1191 | /* | |
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). | |
1197 | */ | |
1198 | static void baycom_probe(struct net_device *dev) | |
1199 | { | |
1200 | static char ax25_bcast[AX25_ADDR_LEN] = { | |
1201 | 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1 | |
1202 | }; | |
1203 | static char ax25_nocall[AX25_ADDR_LEN] = { | |
1204 | 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1 | |
1205 | }; | |
1206 | const struct hdlcdrv_channel_params dflt_ch_params = { | |
1207 | 20, 2, 10, 40, 0 | |
1208 | }; | |
1209 | struct baycom_state *bc; | |
1210 | ||
1211 | /* | |
1212 | * not a real probe! only initialize data structures | |
1213 | */ | |
1214 | bc = netdev_priv(dev); | |
1215 | /* | |
1216 | * initialize the baycom_state struct | |
1217 | */ | |
1218 | bc->ch_params = dflt_ch_params; | |
1219 | bc->ptt_keyed = 0; | |
1220 | ||
1221 | /* | |
1222 | * initialize the device struct | |
1223 | */ | |
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; | |
1229 | ||
1230 | /* Fill in the fields of the device structure */ | |
1231 | bc->skb = NULL; | |
1232 | ||
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; | |
1241 | ||
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; | |
1249 | ||
1250 | /* New style flags */ | |
1251 | dev->flags = 0; | |
1252 | } | |
1253 | ||
1254 | /* --------------------------------------------------------------------- */ | |
1255 | ||
1256 | /* | |
1257 | * command line settable parameters | |
1258 | */ | |
1259 | static const char *mode[NR_PORTS] = { "", }; | |
1260 | static int iobase[NR_PORTS] = { 0x378, }; | |
1261 | ||
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"); | |
1266 | ||
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"); | |
1270 | ||
1271 | /* --------------------------------------------------------------------- */ | |
1272 | ||
1273 | static void __init baycom_epp_dev_setup(struct net_device *dev) | |
1274 | { | |
1275 | struct baycom_state *bc = netdev_priv(dev); | |
1276 | ||
1277 | /* | |
1278 | * initialize part of the baycom_state struct | |
1279 | */ | |
1280 | bc->magic = BAYCOM_MAGIC; | |
1281 | bc->cfg.fclk = 19666600; | |
1282 | bc->cfg.bps = 9600; | |
1283 | /* | |
1284 | * initialize part of the device struct | |
1285 | */ | |
1286 | baycom_probe(dev); | |
1287 | } | |
1288 | ||
1289 | static int __init init_baycomepp(void) | |
1290 | { | |
1291 | int i, found = 0; | |
1292 | char set_hw = 1; | |
1293 | ||
1294 | printk(bc_drvinfo); | |
1295 | /* | |
1296 | * register net devices | |
1297 | */ | |
1298 | for (i = 0; i < NR_PORTS; i++) { | |
1299 | struct net_device *dev; | |
1300 | ||
1301 | dev = alloc_netdev(sizeof(struct baycom_state), "bce%d", | |
1302 | baycom_epp_dev_setup); | |
1303 | ||
1304 | if (!dev) { | |
1305 | printk(KERN_WARNING "bce%d : out of memory\n", i); | |
1306 | return found ? 0 : -ENOMEM; | |
1307 | } | |
1308 | ||
1309 | sprintf(dev->name, "bce%d", i); | |
1310 | dev->base_addr = iobase[i]; | |
1311 | ||
1312 | if (!mode[i]) | |
1313 | set_hw = 0; | |
1314 | if (!set_hw) | |
1315 | iobase[i] = 0; | |
1316 | ||
1317 | if (register_netdev(dev)) { | |
1318 | printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name); | |
1319 | free_netdev(dev); | |
1320 | break; | |
1321 | } | |
1322 | if (set_hw && baycom_setmode(netdev_priv(dev), mode[i])) | |
1323 | set_hw = 0; | |
1324 | baycom_device[i] = dev; | |
1325 | found++; | |
1326 | } | |
1327 | ||
1328 | return found ? 0 : -ENXIO; | |
1329 | } | |
1330 | ||
1331 | static void __exit cleanup_baycomepp(void) | |
1332 | { | |
1333 | int i; | |
1334 | ||
1335 | for(i = 0; i < NR_PORTS; i++) { | |
1336 | struct net_device *dev = baycom_device[i]; | |
1337 | ||
1338 | if (dev) { | |
1339 | struct baycom_state *bc = netdev_priv(dev); | |
1340 | if (bc->magic == BAYCOM_MAGIC) { | |
1341 | unregister_netdev(dev); | |
1342 | free_netdev(dev); | |
1343 | } else | |
1344 | printk(paranoia_str, "cleanup_module"); | |
1345 | } | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | module_init(init_baycomepp); | |
1350 | module_exit(cleanup_baycomepp); | |
1351 | ||
1352 | /* --------------------------------------------------------------------- */ | |
1353 | ||
1354 | #ifndef MODULE | |
1355 | ||
1356 | /* | |
1357 | * format: baycom_epp=io,mode | |
1358 | * mode: fpga config options | |
1359 | */ | |
1360 | ||
1361 | static int __init baycom_epp_setup(char *str) | |
1362 | { | |
1363 | static unsigned __initdata nr_dev = 0; | |
1364 | int ints[2]; | |
1365 | ||
1366 | if (nr_dev >= NR_PORTS) | |
1367 | return 0; | |
1368 | str = get_options(str, 2, ints); | |
1369 | if (ints[0] < 1) | |
1370 | return 0; | |
1371 | mode[nr_dev] = str; | |
1372 | iobase[nr_dev] = ints[1]; | |
1373 | nr_dev++; | |
1374 | return 1; | |
1375 | } | |
1376 | ||
1377 | __setup("baycom_epp=", baycom_epp_setup); | |
1378 | ||
1379 | #endif /* MODULE */ | |
1380 | /* --------------------------------------------------------------------- */ |