1 /*
2  * NETJet mISDN driver
3  *
4  * Author       Karsten Keil <keil@isdn4linux.de>
5  *
6  * Copyright 2009  by Karsten Keil <keil@isdn4linux.de>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  *
21  */
22 
23 #include <linux/interrupt.h>
24 #include <linux/module.h>
25 #include <linux/pci.h>
26 #include <linux/delay.h>
27 #include <linux/mISDNhw.h>
28 #include <linux/slab.h>
29 #include "ipac.h"
30 #include "iohelper.h"
31 #include "netjet.h"
32 #include <linux/isdn/hdlc.h>
33 
34 #define NETJET_REV	"2.0"
35 
36 enum nj_types {
37 	NETJET_S_TJ300,
38 	NETJET_S_TJ320,
39 	ENTERNOW__TJ320,
40 };
41 
42 struct tiger_dma {
43 	size_t		size;
44 	u32		*start;
45 	int		idx;
46 	u32		dmastart;
47 	u32		dmairq;
48 	u32		dmaend;
49 	u32		dmacur;
50 };
51 
52 struct tiger_hw;
53 
54 struct tiger_ch {
55 	struct bchannel		bch;
56 	struct tiger_hw		*nj;
57 	int			idx;
58 	int			free;
59 	int			lastrx;
60 	u16			rxstate;
61 	u16			txstate;
62 	struct isdnhdlc_vars	hsend;
63 	struct isdnhdlc_vars	hrecv;
64 	u8			*hsbuf;
65 	u8			*hrbuf;
66 };
67 
68 #define TX_INIT		0x0001
69 #define TX_IDLE		0x0002
70 #define TX_RUN		0x0004
71 #define TX_UNDERRUN	0x0100
72 #define RX_OVERRUN	0x0100
73 
74 #define LOG_SIZE	64
75 
76 struct tiger_hw {
77 	struct list_head	list;
78 	struct pci_dev		*pdev;
79 	char			name[MISDN_MAX_IDLEN];
80 	enum nj_types		typ;
81 	int			irq;
82 	u32			irqcnt;
83 	u32			base;
84 	size_t			base_s;
85 	dma_addr_t		dma;
86 	void			*dma_p;
87 	spinlock_t		lock;	/* lock HW */
88 	struct isac_hw		isac;
89 	struct tiger_dma	send;
90 	struct tiger_dma	recv;
91 	struct tiger_ch		bc[2];
92 	u8			ctrlreg;
93 	u8			dmactrl;
94 	u8			auxd;
95 	u8			last_is0;
96 	u8			irqmask0;
97 	char			log[LOG_SIZE];
98 };
99 
100 static LIST_HEAD(Cards);
101 static DEFINE_RWLOCK(card_lock); /* protect Cards */
102 static u32 debug;
103 static int nj_cnt;
104 
105 static void
106 _set_debug(struct tiger_hw *card)
107 {
108 	card->isac.dch.debug = debug;
109 	card->bc[0].bch.debug = debug;
110 	card->bc[1].bch.debug = debug;
111 }
112 
113 static int
114 set_debug(const char *val, const struct kernel_param *kp)
115 {
116 	int ret;
117 	struct tiger_hw *card;
118 
119 	ret = param_set_uint(val, kp);
120 	if (!ret) {
121 		read_lock(&card_lock);
122 		list_for_each_entry(card, &Cards, list)
123 			_set_debug(card);
124 		read_unlock(&card_lock);
125 	}
126 	return ret;
127 }
128 
129 MODULE_AUTHOR("Karsten Keil");
130 MODULE_LICENSE("GPL v2");
131 MODULE_VERSION(NETJET_REV);
132 module_param_call(debug, set_debug, param_get_uint, &debug, S_IRUGO | S_IWUSR);
133 MODULE_PARM_DESC(debug, "Netjet debug mask");
134 
135 static void
136 nj_disable_hwirq(struct tiger_hw *card)
137 {
138 	outb(0, card->base + NJ_IRQMASK0);
139 	outb(0, card->base + NJ_IRQMASK1);
140 }
141 
142 
143 static u8
144 ReadISAC_nj(void *p, u8 offset)
145 {
146 	struct tiger_hw *card = p;
147 	u8 ret;
148 
149 	card->auxd &= 0xfc;
150 	card->auxd |= (offset >> 4) & 3;
151 	outb(card->auxd, card->base + NJ_AUXDATA);
152 	ret = inb(card->base + NJ_ISAC_OFF + ((offset & 0x0f) << 2));
153 	return ret;
154 }
155 
156 static void
157 WriteISAC_nj(void *p, u8 offset, u8 value)
158 {
159 	struct tiger_hw *card = p;
160 
161 	card->auxd &= 0xfc;
162 	card->auxd |= (offset >> 4) & 3;
163 	outb(card->auxd, card->base + NJ_AUXDATA);
164 	outb(value, card->base + NJ_ISAC_OFF + ((offset & 0x0f) << 2));
165 }
166 
167 static void
168 ReadFiFoISAC_nj(void *p, u8 offset, u8 *data, int size)
169 {
170 	struct tiger_hw *card = p;
171 
172 	card->auxd &= 0xfc;
173 	outb(card->auxd, card->base + NJ_AUXDATA);
174 	insb(card->base + NJ_ISAC_OFF, data, size);
175 }
176 
177 static void
178 WriteFiFoISAC_nj(void *p, u8 offset, u8 *data, int size)
179 {
180 	struct tiger_hw *card = p;
181 
182 	card->auxd &= 0xfc;
183 	outb(card->auxd, card->base + NJ_AUXDATA);
184 	outsb(card->base + NJ_ISAC_OFF, data, size);
185 }
186 
187 static void
188 fill_mem(struct tiger_ch *bc, u32 idx, u32 cnt, u32 fill)
189 {
190 	struct tiger_hw *card = bc->bch.hw;
191 	u32 mask = 0xff, val;
192 
193 	pr_debug("%s: B%1d fill %02x len %d idx %d/%d\n", card->name,
194 		 bc->bch.nr, fill, cnt, idx, card->send.idx);
195 	if (bc->bch.nr & 2) {
196 		fill  <<= 8;
197 		mask <<= 8;
198 	}
199 	mask ^= 0xffffffff;
200 	while (cnt--) {
201 		val = card->send.start[idx];
202 		val &= mask;
203 		val |= fill;
204 		card->send.start[idx++] = val;
205 		if (idx >= card->send.size)
206 			idx = 0;
207 	}
208 }
209 
210 static int
211 mode_tiger(struct tiger_ch *bc, u32 protocol)
212 {
213 	struct tiger_hw *card = bc->bch.hw;
214 
215 	pr_debug("%s: B%1d protocol %x-->%x\n", card->name,
216 		 bc->bch.nr, bc->bch.state, protocol);
217 	switch (protocol) {
218 	case ISDN_P_NONE:
219 		if (bc->bch.state == ISDN_P_NONE)
220 			break;
221 		fill_mem(bc, 0, card->send.size, 0xff);
222 		bc->bch.state = protocol;
223 		/* only stop dma and interrupts if both channels NULL */
224 		if ((card->bc[0].bch.state == ISDN_P_NONE) &&
225 		    (card->bc[1].bch.state == ISDN_P_NONE)) {
226 			card->dmactrl = 0;
227 			outb(card->dmactrl, card->base + NJ_DMACTRL);
228 			outb(0, card->base + NJ_IRQMASK0);
229 		}
230 		test_and_clear_bit(FLG_HDLC, &bc->bch.Flags);
231 		test_and_clear_bit(FLG_TRANSPARENT, &bc->bch.Flags);
232 		bc->txstate = 0;
233 		bc->rxstate = 0;
234 		bc->lastrx = -1;
235 		break;
236 	case ISDN_P_B_RAW:
237 		test_and_set_bit(FLG_TRANSPARENT, &bc->bch.Flags);
238 		bc->bch.state = protocol;
239 		bc->idx = 0;
240 		bc->free = card->send.size / 2;
241 		bc->rxstate = 0;
242 		bc->txstate = TX_INIT | TX_IDLE;
243 		bc->lastrx = -1;
244 		if (!card->dmactrl) {
245 			card->dmactrl = 1;
246 			outb(card->dmactrl, card->base + NJ_DMACTRL);
247 			outb(0x0f, card->base + NJ_IRQMASK0);
248 		}
249 		break;
250 	case ISDN_P_B_HDLC:
251 		test_and_set_bit(FLG_HDLC, &bc->bch.Flags);
252 		bc->bch.state = protocol;
253 		bc->idx = 0;
254 		bc->free = card->send.size / 2;
255 		bc->rxstate = 0;
256 		bc->txstate = TX_INIT | TX_IDLE;
257 		isdnhdlc_rcv_init(&bc->hrecv, 0);
258 		isdnhdlc_out_init(&bc->hsend, 0);
259 		bc->lastrx = -1;
260 		if (!card->dmactrl) {
261 			card->dmactrl = 1;
262 			outb(card->dmactrl, card->base + NJ_DMACTRL);
263 			outb(0x0f, card->base + NJ_IRQMASK0);
264 		}
265 		break;
266 	default:
267 		pr_info("%s: %s protocol %x not handled\n", card->name,
268 			__func__, protocol);
269 		return -ENOPROTOOPT;
270 	}
271 	card->send.dmacur = inl(card->base + NJ_DMA_READ_ADR);
272 	card->recv.dmacur = inl(card->base + NJ_DMA_WRITE_ADR);
273 	card->send.idx = (card->send.dmacur - card->send.dmastart) >> 2;
274 	card->recv.idx = (card->recv.dmacur - card->recv.dmastart) >> 2;
275 	pr_debug("%s: %s ctrl %x irq  %02x/%02x idx %d/%d\n",
276 		 card->name, __func__,
277 		 inb(card->base + NJ_DMACTRL),
278 		 inb(card->base + NJ_IRQMASK0),
279 		 inb(card->base + NJ_IRQSTAT0),
280 		 card->send.idx,
281 		 card->recv.idx);
282 	return 0;
283 }
284 
285 static void
286 nj_reset(struct tiger_hw *card)
287 {
288 	outb(0xff, card->base + NJ_CTRL); /* Reset On */
289 	mdelay(1);
290 
291 	/* now edge triggered for TJ320 GE 13/07/00 */
292 	/* see comment in IRQ function */
293 	if (card->typ == NETJET_S_TJ320) /* TJ320 */
294 		card->ctrlreg = 0x40;  /* Reset Off and status read clear */
295 	else
296 		card->ctrlreg = 0x00;  /* Reset Off and status read clear */
297 	outb(card->ctrlreg, card->base + NJ_CTRL);
298 	mdelay(10);
299 
300 	/* configure AUX pins (all output except ISAC IRQ pin) */
301 	card->auxd = 0;
302 	card->dmactrl = 0;
303 	outb(~NJ_ISACIRQ, card->base + NJ_AUXCTRL);
304 	outb(NJ_ISACIRQ,  card->base + NJ_IRQMASK1);
305 	outb(card->auxd, card->base + NJ_AUXDATA);
306 }
307 
308 static int
309 inittiger(struct tiger_hw *card)
310 {
311 	int i;
312 
313 	card->dma_p = pci_alloc_consistent(card->pdev, NJ_DMA_SIZE,
314 					   &card->dma);
315 	if (!card->dma_p) {
316 		pr_info("%s: No DMA memory\n", card->name);
317 		return -ENOMEM;
318 	}
319 	if ((u64)card->dma > 0xffffffff) {
320 		pr_info("%s: DMA outside 32 bit\n", card->name);
321 		return -ENOMEM;
322 	}
323 	for (i = 0; i < 2; i++) {
324 		card->bc[i].hsbuf = kmalloc(NJ_DMA_TXSIZE, GFP_ATOMIC);
325 		if (!card->bc[i].hsbuf) {
326 			pr_info("%s: no B%d send buffer\n", card->name, i + 1);
327 			return -ENOMEM;
328 		}
329 		card->bc[i].hrbuf = kmalloc(NJ_DMA_RXSIZE, GFP_ATOMIC);
330 		if (!card->bc[i].hrbuf) {
331 			pr_info("%s: no B%d recv buffer\n", card->name, i + 1);
332 			return -ENOMEM;
333 		}
334 	}
335 	memset(card->dma_p, 0xff, NJ_DMA_SIZE);
336 
337 	card->send.start = card->dma_p;
338 	card->send.dmastart = (u32)card->dma;
339 	card->send.dmaend = card->send.dmastart +
340 		(4 * (NJ_DMA_TXSIZE - 1));
341 	card->send.dmairq = card->send.dmastart +
342 		(4 * ((NJ_DMA_TXSIZE / 2) - 1));
343 	card->send.size = NJ_DMA_TXSIZE;
344 
345 	if (debug & DEBUG_HW)
346 		pr_notice("%s: send buffer phy %#x - %#x - %#x  virt %p"
347 			  " size %zu u32\n", card->name,
348 			  card->send.dmastart, card->send.dmairq,
349 			  card->send.dmaend, card->send.start, card->send.size);
350 
351 	outl(card->send.dmastart, card->base + NJ_DMA_READ_START);
352 	outl(card->send.dmairq, card->base + NJ_DMA_READ_IRQ);
353 	outl(card->send.dmaend, card->base + NJ_DMA_READ_END);
354 
355 	card->recv.start = card->dma_p + (NJ_DMA_SIZE / 2);
356 	card->recv.dmastart = (u32)card->dma  + (NJ_DMA_SIZE / 2);
357 	card->recv.dmaend = card->recv.dmastart +
358 		(4 * (NJ_DMA_RXSIZE - 1));
359 	card->recv.dmairq = card->recv.dmastart +
360 		(4 * ((NJ_DMA_RXSIZE / 2) - 1));
361 	card->recv.size = NJ_DMA_RXSIZE;
362 
363 	if (debug & DEBUG_HW)
364 		pr_notice("%s: recv buffer phy %#x - %#x - %#x  virt %p"
365 			  " size %zu u32\n", card->name,
366 			  card->recv.dmastart, card->recv.dmairq,
367 			  card->recv.dmaend, card->recv.start, card->recv.size);
368 
369 	outl(card->recv.dmastart, card->base + NJ_DMA_WRITE_START);
370 	outl(card->recv.dmairq, card->base + NJ_DMA_WRITE_IRQ);
371 	outl(card->recv.dmaend, card->base + NJ_DMA_WRITE_END);
372 	return 0;
373 }
374 
375 static void
376 read_dma(struct tiger_ch *bc, u32 idx, int cnt)
377 {
378 	struct tiger_hw *card = bc->bch.hw;
379 	int i, stat;
380 	u32 val;
381 	u8 *p, *pn;
382 
383 	if (bc->lastrx == idx) {
384 		bc->rxstate |= RX_OVERRUN;
385 		pr_info("%s: B%1d overrun at idx %d\n", card->name,
386 			bc->bch.nr, idx);
387 	}
388 	bc->lastrx = idx;
389 	if (test_bit(FLG_RX_OFF, &bc->bch.Flags)) {
390 		bc->bch.dropcnt += cnt;
391 		return;
392 	}
393 	stat = bchannel_get_rxbuf(&bc->bch, cnt);
394 	/* only transparent use the count here, HDLC overun is detected later */
395 	if (stat == -ENOMEM) {
396 		pr_warning("%s.B%d: No memory for %d bytes\n",
397 			   card->name, bc->bch.nr, cnt);
398 		return;
399 	}
400 	if (test_bit(FLG_TRANSPARENT, &bc->bch.Flags))
401 		p = skb_put(bc->bch.rx_skb, cnt);
402 	else
403 		p = bc->hrbuf;
404 
405 	for (i = 0; i < cnt; i++) {
406 		val = card->recv.start[idx++];
407 		if (bc->bch.nr & 2)
408 			val >>= 8;
409 		if (idx >= card->recv.size)
410 			idx = 0;
411 		p[i] = val & 0xff;
412 	}
413 
414 	if (test_bit(FLG_TRANSPARENT, &bc->bch.Flags)) {
415 		recv_Bchannel(&bc->bch, 0, false);
416 		return;
417 	}
418 
419 	pn = bc->hrbuf;
420 	while (cnt > 0) {
421 		stat = isdnhdlc_decode(&bc->hrecv, pn, cnt, &i,
422 				       bc->bch.rx_skb->data, bc->bch.maxlen);
423 		if (stat > 0) { /* valid frame received */
424 			p = skb_put(bc->bch.rx_skb, stat);
425 			if (debug & DEBUG_HW_BFIFO) {
426 				snprintf(card->log, LOG_SIZE,
427 					 "B%1d-recv %s %d ", bc->bch.nr,
428 					 card->name, stat);
429 				print_hex_dump_bytes(card->log,
430 						     DUMP_PREFIX_OFFSET, p,
431 						     stat);
432 			}
433 			recv_Bchannel(&bc->bch, 0, false);
434 			stat = bchannel_get_rxbuf(&bc->bch, bc->bch.maxlen);
435 			if (stat < 0) {
436 				pr_warning("%s.B%d: No memory for %d bytes\n",
437 					   card->name, bc->bch.nr, cnt);
438 				return;
439 			}
440 		} else if (stat == -HDLC_CRC_ERROR) {
441 			pr_info("%s: B%1d receive frame CRC error\n",
442 				card->name, bc->bch.nr);
443 		} else if (stat == -HDLC_FRAMING_ERROR) {
444 			pr_info("%s: B%1d receive framing error\n",
445 				card->name, bc->bch.nr);
446 		} else if (stat == -HDLC_LENGTH_ERROR) {
447 			pr_info("%s: B%1d receive frame too long (> %d)\n",
448 				card->name, bc->bch.nr, bc->bch.maxlen);
449 		}
450 		pn += i;
451 		cnt -= i;
452 	}
453 }
454 
455 static void
456 recv_tiger(struct tiger_hw *card, u8 irq_stat)
457 {
458 	u32 idx;
459 	int cnt = card->recv.size / 2;
460 
461 	/* Note receive is via the WRITE DMA channel */
462 	card->last_is0 &= ~NJ_IRQM0_WR_MASK;
463 	card->last_is0 |= (irq_stat & NJ_IRQM0_WR_MASK);
464 
465 	if (irq_stat & NJ_IRQM0_WR_END)
466 		idx = cnt - 1;
467 	else
468 		idx = card->recv.size - 1;
469 
470 	if (test_bit(FLG_ACTIVE, &card->bc[0].bch.Flags))
471 		read_dma(&card->bc[0], idx, cnt);
472 	if (test_bit(FLG_ACTIVE, &card->bc[1].bch.Flags))
473 		read_dma(&card->bc[1], idx, cnt);
474 }
475 
476 /* sync with current DMA address at start or after exception */
477 static void
478 resync(struct tiger_ch *bc, struct tiger_hw *card)
479 {
480 	card->send.dmacur = inl(card->base | NJ_DMA_READ_ADR);
481 	card->send.idx = (card->send.dmacur - card->send.dmastart) >> 2;
482 	if (bc->free > card->send.size / 2)
483 		bc->free = card->send.size / 2;
484 	/* currently we simple sync to the next complete free area
485 	 * this hast the advantage that we have always maximum time to
486 	 * handle TX irq
487 	 */
488 	if (card->send.idx < ((card->send.size / 2) - 1))
489 		bc->idx = (card->recv.size / 2) - 1;
490 	else
491 		bc->idx = card->recv.size - 1;
492 	bc->txstate = TX_RUN;
493 	pr_debug("%s: %s B%1d free %d idx %d/%d\n", card->name,
494 		 __func__, bc->bch.nr, bc->free, bc->idx, card->send.idx);
495 }
496 
497 static int bc_next_frame(struct tiger_ch *);
498 
499 static void
500 fill_hdlc_flag(struct tiger_ch *bc)
501 {
502 	struct tiger_hw *card = bc->bch.hw;
503 	int count, i;
504 	u32 m, v;
505 	u8  *p;
506 
507 	if (bc->free == 0)
508 		return;
509 	pr_debug("%s: %s B%1d %d state %x idx %d/%d\n", card->name,
510 		 __func__, bc->bch.nr, bc->free, bc->txstate,
511 		 bc->idx, card->send.idx);
512 	if (bc->txstate & (TX_IDLE | TX_INIT | TX_UNDERRUN))
513 		resync(bc, card);
514 	count = isdnhdlc_encode(&bc->hsend, NULL, 0, &i,
515 				bc->hsbuf, bc->free);
516 	pr_debug("%s: B%1d hdlc encoded %d flags\n", card->name,
517 		 bc->bch.nr, count);
518 	bc->free -= count;
519 	p = bc->hsbuf;
520 	m = (bc->bch.nr & 1) ? 0xffffff00 : 0xffff00ff;
521 	for (i = 0; i < count; i++) {
522 		if (bc->idx >= card->send.size)
523 			bc->idx = 0;
524 		v = card->send.start[bc->idx];
525 		v &= m;
526 		v |= (bc->bch.nr & 1) ? (u32)(p[i]) : ((u32)(p[i])) << 8;
527 		card->send.start[bc->idx++] = v;
528 	}
529 	if (debug & DEBUG_HW_BFIFO) {
530 		snprintf(card->log, LOG_SIZE, "B%1d-send %s %d ",
531 			 bc->bch.nr, card->name, count);
532 		print_hex_dump_bytes(card->log, DUMP_PREFIX_OFFSET, p, count);
533 	}
534 }
535 
536 static void
537 fill_dma(struct tiger_ch *bc)
538 {
539 	struct tiger_hw *card = bc->bch.hw;
540 	int count, i, fillempty = 0;
541 	u32 m, v, n = 0;
542 	u8  *p;
543 
544 	if (bc->free == 0)
545 		return;
546 	if (!bc->bch.tx_skb) {
547 		if (!test_bit(FLG_TX_EMPTY, &bc->bch.Flags))
548 			return;
549 		fillempty = 1;
550 		count = card->send.size >> 1;
551 		p = bc->bch.fill;
552 	} else {
553 		count = bc->bch.tx_skb->len - bc->bch.tx_idx;
554 		if (count <= 0)
555 			return;
556 		pr_debug("%s: %s B%1d %d/%d/%d/%d state %x idx %d/%d\n",
557 			 card->name, __func__, bc->bch.nr, count, bc->free,
558 			 bc->bch.tx_idx, bc->bch.tx_skb->len, bc->txstate,
559 			 bc->idx, card->send.idx);
560 		p = bc->bch.tx_skb->data + bc->bch.tx_idx;
561 	}
562 	if (bc->txstate & (TX_IDLE | TX_INIT | TX_UNDERRUN))
563 		resync(bc, card);
564 	if (test_bit(FLG_HDLC, &bc->bch.Flags) && !fillempty) {
565 		count = isdnhdlc_encode(&bc->hsend, p, count, &i,
566 					bc->hsbuf, bc->free);
567 		pr_debug("%s: B%1d hdlc encoded %d in %d\n", card->name,
568 			 bc->bch.nr, i, count);
569 		bc->bch.tx_idx += i;
570 		bc->free -= count;
571 		p = bc->hsbuf;
572 	} else {
573 		if (count > bc->free)
574 			count = bc->free;
575 		if (!fillempty)
576 			bc->bch.tx_idx += count;
577 		bc->free -= count;
578 	}
579 	m = (bc->bch.nr & 1) ? 0xffffff00 : 0xffff00ff;
580 	if (fillempty) {
581 		n = p[0];
582 		if (!(bc->bch.nr & 1))
583 			n <<= 8;
584 		for (i = 0; i < count; i++) {
585 			if (bc->idx >= card->send.size)
586 				bc->idx = 0;
587 			v = card->send.start[bc->idx];
588 			v &= m;
589 			v |= n;
590 			card->send.start[bc->idx++] = v;
591 		}
592 	} else {
593 		for (i = 0; i < count; i++) {
594 			if (bc->idx >= card->send.size)
595 				bc->idx = 0;
596 			v = card->send.start[bc->idx];
597 			v &= m;
598 			n = p[i];
599 			v |= (bc->bch.nr & 1) ? n : n << 8;
600 			card->send.start[bc->idx++] = v;
601 		}
602 	}
603 	if (debug & DEBUG_HW_BFIFO) {
604 		snprintf(card->log, LOG_SIZE, "B%1d-send %s %d ",
605 			 bc->bch.nr, card->name, count);
606 		print_hex_dump_bytes(card->log, DUMP_PREFIX_OFFSET, p, count);
607 	}
608 	if (bc->free)
609 		bc_next_frame(bc);
610 }
611 
612 
613 static int
614 bc_next_frame(struct tiger_ch *bc)
615 {
616 	int ret = 1;
617 
618 	if (bc->bch.tx_skb && bc->bch.tx_idx < bc->bch.tx_skb->len) {
619 		fill_dma(bc);
620 	} else {
621 		if (bc->bch.tx_skb)
622 			dev_kfree_skb(bc->bch.tx_skb);
623 		if (get_next_bframe(&bc->bch)) {
624 			fill_dma(bc);
625 			test_and_clear_bit(FLG_TX_EMPTY, &bc->bch.Flags);
626 		} else if (test_bit(FLG_TX_EMPTY, &bc->bch.Flags)) {
627 			fill_dma(bc);
628 		} else if (test_bit(FLG_FILLEMPTY, &bc->bch.Flags)) {
629 			test_and_set_bit(FLG_TX_EMPTY, &bc->bch.Flags);
630 			ret = 0;
631 		} else {
632 			ret = 0;
633 		}
634 	}
635 	return ret;
636 }
637 
638 static void
639 send_tiger_bc(struct tiger_hw *card, struct tiger_ch *bc)
640 {
641 	int ret;
642 
643 	bc->free += card->send.size / 2;
644 	if (bc->free >= card->send.size) {
645 		if (!(bc->txstate & (TX_UNDERRUN | TX_INIT))) {
646 			pr_info("%s: B%1d TX underrun state %x\n", card->name,
647 				bc->bch.nr, bc->txstate);
648 			bc->txstate |= TX_UNDERRUN;
649 		}
650 		bc->free = card->send.size;
651 	}
652 	ret = bc_next_frame(bc);
653 	if (!ret) {
654 		if (test_bit(FLG_HDLC, &bc->bch.Flags)) {
655 			fill_hdlc_flag(bc);
656 			return;
657 		}
658 		pr_debug("%s: B%1d TX no data free %d idx %d/%d\n", card->name,
659 			 bc->bch.nr, bc->free, bc->idx, card->send.idx);
660 		if (!(bc->txstate & (TX_IDLE | TX_INIT))) {
661 			fill_mem(bc, bc->idx, bc->free, 0xff);
662 			if (bc->free == card->send.size)
663 				bc->txstate |= TX_IDLE;
664 		}
665 	}
666 }
667 
668 static void
669 send_tiger(struct tiger_hw *card, u8 irq_stat)
670 {
671 	int i;
672 
673 	/* Note send is via the READ DMA channel */
674 	if ((irq_stat & card->last_is0) & NJ_IRQM0_RD_MASK) {
675 		pr_info("%s: tiger warn write double dma %x/%x\n",
676 			card->name, irq_stat, card->last_is0);
677 		return;
678 	} else {
679 		card->last_is0 &= ~NJ_IRQM0_RD_MASK;
680 		card->last_is0 |= (irq_stat & NJ_IRQM0_RD_MASK);
681 	}
682 	for (i = 0; i < 2; i++) {
683 		if (test_bit(FLG_ACTIVE, &card->bc[i].bch.Flags))
684 			send_tiger_bc(card, &card->bc[i]);
685 	}
686 }
687 
688 static irqreturn_t
689 nj_irq(int intno, void *dev_id)
690 {
691 	struct tiger_hw *card = dev_id;
692 	u8 val, s1val, s0val;
693 
694 	spin_lock(&card->lock);
695 	s0val = inb(card->base | NJ_IRQSTAT0);
696 	s1val = inb(card->base | NJ_IRQSTAT1);
697 	if ((s1val & NJ_ISACIRQ) && (s0val == 0)) {
698 		/* shared IRQ */
699 		spin_unlock(&card->lock);
700 		return IRQ_NONE;
701 	}
702 	pr_debug("%s: IRQSTAT0 %02x IRQSTAT1 %02x\n", card->name, s0val, s1val);
703 	card->irqcnt++;
704 	if (!(s1val & NJ_ISACIRQ)) {
705 		val = ReadISAC_nj(card, ISAC_ISTA);
706 		if (val)
707 			mISDNisac_irq(&card->isac, val);
708 	}
709 
710 	if (s0val)
711 		/* write to clear */
712 		outb(s0val, card->base | NJ_IRQSTAT0);
713 	else
714 		goto end;
715 	s1val = s0val;
716 	/* set bits in sval to indicate which page is free */
717 	card->recv.dmacur = inl(card->base | NJ_DMA_WRITE_ADR);
718 	card->recv.idx = (card->recv.dmacur - card->recv.dmastart) >> 2;
719 	if (card->recv.dmacur < card->recv.dmairq)
720 		s0val = 0x08;	/* the 2nd write area is free */
721 	else
722 		s0val = 0x04;	/* the 1st write area is free */
723 
724 	card->send.dmacur = inl(card->base | NJ_DMA_READ_ADR);
725 	card->send.idx = (card->send.dmacur - card->send.dmastart) >> 2;
726 	if (card->send.dmacur < card->send.dmairq)
727 		s0val |= 0x02;	/* the 2nd read area is free */
728 	else
729 		s0val |= 0x01;	/* the 1st read area is free */
730 
731 	pr_debug("%s: DMA Status %02x/%02x/%02x %d/%d\n", card->name,
732 		 s1val, s0val, card->last_is0,
733 		 card->recv.idx, card->send.idx);
734 	/* test if we have a DMA interrupt */
735 	if (s0val != card->last_is0) {
736 		if ((s0val & NJ_IRQM0_RD_MASK) !=
737 		    (card->last_is0 & NJ_IRQM0_RD_MASK))
738 			/* got a write dma int */
739 			send_tiger(card, s0val);
740 		if ((s0val & NJ_IRQM0_WR_MASK) !=
741 		    (card->last_is0 & NJ_IRQM0_WR_MASK))
742 			/* got a read dma int */
743 			recv_tiger(card, s0val);
744 	}
745 end:
746 	spin_unlock(&card->lock);
747 	return IRQ_HANDLED;
748 }
749 
750 static int
751 nj_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
752 {
753 	int ret = -EINVAL;
754 	struct bchannel *bch = container_of(ch, struct bchannel, ch);
755 	struct tiger_ch *bc = container_of(bch, struct tiger_ch, bch);
756 	struct tiger_hw *card = bch->hw;
757 	struct mISDNhead *hh = mISDN_HEAD_P(skb);
758 	unsigned long flags;
759 
760 	switch (hh->prim) {
761 	case PH_DATA_REQ:
762 		spin_lock_irqsave(&card->lock, flags);
763 		ret = bchannel_senddata(bch, skb);
764 		if (ret > 0) { /* direct TX */
765 			fill_dma(bc);
766 			ret = 0;
767 		}
768 		spin_unlock_irqrestore(&card->lock, flags);
769 		return ret;
770 	case PH_ACTIVATE_REQ:
771 		spin_lock_irqsave(&card->lock, flags);
772 		if (!test_and_set_bit(FLG_ACTIVE, &bch->Flags))
773 			ret = mode_tiger(bc, ch->protocol);
774 		else
775 			ret = 0;
776 		spin_unlock_irqrestore(&card->lock, flags);
777 		if (!ret)
778 			_queue_data(ch, PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
779 				    NULL, GFP_KERNEL);
780 		break;
781 	case PH_DEACTIVATE_REQ:
782 		spin_lock_irqsave(&card->lock, flags);
783 		mISDN_clear_bchannel(bch);
784 		mode_tiger(bc, ISDN_P_NONE);
785 		spin_unlock_irqrestore(&card->lock, flags);
786 		_queue_data(ch, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
787 			    NULL, GFP_KERNEL);
788 		ret = 0;
789 		break;
790 	}
791 	if (!ret)
792 		dev_kfree_skb(skb);
793 	return ret;
794 }
795 
796 static int
797 channel_bctrl(struct tiger_ch *bc, struct mISDN_ctrl_req *cq)
798 {
799 	return mISDN_ctrl_bchannel(&bc->bch, cq);
800 }
801 
802 static int
803 nj_bctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
804 {
805 	struct bchannel *bch = container_of(ch, struct bchannel, ch);
806 	struct tiger_ch *bc = container_of(bch, struct tiger_ch, bch);
807 	struct tiger_hw *card  = bch->hw;
808 	int ret = -EINVAL;
809 	u_long flags;
810 
811 	pr_debug("%s: %s cmd:%x %p\n", card->name, __func__, cmd, arg);
812 	switch (cmd) {
813 	case CLOSE_CHANNEL:
814 		test_and_clear_bit(FLG_OPEN, &bch->Flags);
815 		cancel_work_sync(&bch->workq);
816 		spin_lock_irqsave(&card->lock, flags);
817 		mISDN_clear_bchannel(bch);
818 		mode_tiger(bc, ISDN_P_NONE);
819 		spin_unlock_irqrestore(&card->lock, flags);
820 		ch->protocol = ISDN_P_NONE;
821 		ch->peer = NULL;
822 		module_put(THIS_MODULE);
823 		ret = 0;
824 		break;
825 	case CONTROL_CHANNEL:
826 		ret = channel_bctrl(bc, arg);
827 		break;
828 	default:
829 		pr_info("%s: %s unknown prim(%x)\n", card->name, __func__, cmd);
830 	}
831 	return ret;
832 }
833 
834 static int
835 channel_ctrl(struct tiger_hw *card, struct mISDN_ctrl_req *cq)
836 {
837 	int	ret = 0;
838 
839 	switch (cq->op) {
840 	case MISDN_CTRL_GETOP:
841 		cq->op = MISDN_CTRL_LOOP | MISDN_CTRL_L1_TIMER3;
842 		break;
843 	case MISDN_CTRL_LOOP:
844 		/* cq->channel: 0 disable, 1 B1 loop 2 B2 loop, 3 both */
845 		if (cq->channel < 0 || cq->channel > 3) {
846 			ret = -EINVAL;
847 			break;
848 		}
849 		ret = card->isac.ctrl(&card->isac, HW_TESTLOOP, cq->channel);
850 		break;
851 	case MISDN_CTRL_L1_TIMER3:
852 		ret = card->isac.ctrl(&card->isac, HW_TIMER3_VALUE, cq->p1);
853 		break;
854 	default:
855 		pr_info("%s: %s unknown Op %x\n", card->name, __func__, cq->op);
856 		ret = -EINVAL;
857 		break;
858 	}
859 	return ret;
860 }
861 
862 static int
863 open_bchannel(struct tiger_hw *card, struct channel_req *rq)
864 {
865 	struct bchannel *bch;
866 
867 	if (rq->adr.channel == 0 || rq->adr.channel > 2)
868 		return -EINVAL;
869 	if (rq->protocol == ISDN_P_NONE)
870 		return -EINVAL;
871 	bch = &card->bc[rq->adr.channel - 1].bch;
872 	if (test_and_set_bit(FLG_OPEN, &bch->Flags))
873 		return -EBUSY; /* b-channel can be only open once */
874 	test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
875 	bch->ch.protocol = rq->protocol;
876 	rq->ch = &bch->ch;
877 	return 0;
878 }
879 
880 /*
881  * device control function
882  */
883 static int
884 nj_dctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
885 {
886 	struct mISDNdevice	*dev = container_of(ch, struct mISDNdevice, D);
887 	struct dchannel		*dch = container_of(dev, struct dchannel, dev);
888 	struct tiger_hw	*card = dch->hw;
889 	struct channel_req	*rq;
890 	int			err = 0;
891 
892 	pr_debug("%s: %s cmd:%x %p\n", card->name, __func__, cmd, arg);
893 	switch (cmd) {
894 	case OPEN_CHANNEL:
895 		rq = arg;
896 		if (rq->protocol == ISDN_P_TE_S0)
897 			err = card->isac.open(&card->isac, rq);
898 		else
899 			err = open_bchannel(card, rq);
900 		if (err)
901 			break;
902 		if (!try_module_get(THIS_MODULE))
903 			pr_info("%s: cannot get module\n", card->name);
904 		break;
905 	case CLOSE_CHANNEL:
906 		pr_debug("%s: dev(%d) close from %p\n", card->name, dch->dev.id,
907 			 __builtin_return_address(0));
908 		module_put(THIS_MODULE);
909 		break;
910 	case CONTROL_CHANNEL:
911 		err = channel_ctrl(card, arg);
912 		break;
913 	default:
914 		pr_debug("%s: %s unknown command %x\n",
915 			 card->name, __func__, cmd);
916 		return -EINVAL;
917 	}
918 	return err;
919 }
920 
921 static int
922 nj_init_card(struct tiger_hw *card)
923 {
924 	u_long flags;
925 	int ret;
926 
927 	spin_lock_irqsave(&card->lock, flags);
928 	nj_disable_hwirq(card);
929 	spin_unlock_irqrestore(&card->lock, flags);
930 
931 	card->irq = card->pdev->irq;
932 	if (request_irq(card->irq, nj_irq, IRQF_SHARED, card->name, card)) {
933 		pr_info("%s: couldn't get interrupt %d\n",
934 			card->name, card->irq);
935 		card->irq = -1;
936 		return -EIO;
937 	}
938 
939 	spin_lock_irqsave(&card->lock, flags);
940 	nj_reset(card);
941 	ret = card->isac.init(&card->isac);
942 	if (ret)
943 		goto error;
944 	ret = inittiger(card);
945 	if (ret)
946 		goto error;
947 	mode_tiger(&card->bc[0], ISDN_P_NONE);
948 	mode_tiger(&card->bc[1], ISDN_P_NONE);
949 error:
950 	spin_unlock_irqrestore(&card->lock, flags);
951 	return ret;
952 }
953 
954 
955 static void
956 nj_release(struct tiger_hw *card)
957 {
958 	u_long flags;
959 	int i;
960 
961 	if (card->base_s) {
962 		spin_lock_irqsave(&card->lock, flags);
963 		nj_disable_hwirq(card);
964 		mode_tiger(&card->bc[0], ISDN_P_NONE);
965 		mode_tiger(&card->bc[1], ISDN_P_NONE);
966 		card->isac.release(&card->isac);
967 		spin_unlock_irqrestore(&card->lock, flags);
968 		release_region(card->base, card->base_s);
969 		card->base_s = 0;
970 	}
971 	if (card->irq > 0)
972 		free_irq(card->irq, card);
973 	if (card->isac.dch.dev.dev.class)
974 		mISDN_unregister_device(&card->isac.dch.dev);
975 
976 	for (i = 0; i < 2; i++) {
977 		mISDN_freebchannel(&card->bc[i].bch);
978 		kfree(card->bc[i].hsbuf);
979 		kfree(card->bc[i].hrbuf);
980 	}
981 	if (card->dma_p)
982 		pci_free_consistent(card->pdev, NJ_DMA_SIZE,
983 				    card->dma_p, card->dma);
984 	write_lock_irqsave(&card_lock, flags);
985 	list_del(&card->list);
986 	write_unlock_irqrestore(&card_lock, flags);
987 	pci_clear_master(card->pdev);
988 	pci_disable_device(card->pdev);
989 	pci_set_drvdata(card->pdev, NULL);
990 	kfree(card);
991 }
992 
993 
994 static int
995 nj_setup(struct tiger_hw *card)
996 {
997 	card->base = pci_resource_start(card->pdev, 0);
998 	card->base_s = pci_resource_len(card->pdev, 0);
999 	if (!request_region(card->base, card->base_s, card->name)) {
1000 		pr_info("%s: NETjet config port %#x-%#x already in use\n",
1001 			card->name, card->base,
1002 			(u32)(card->base + card->base_s - 1));
1003 		card->base_s = 0;
1004 		return -EIO;
1005 	}
1006 	ASSIGN_FUNC(nj, ISAC, card->isac);
1007 	return 0;
1008 }
1009 
1010 
1011 static int
1012 setup_instance(struct tiger_hw *card)
1013 {
1014 	int i, err;
1015 	u_long flags;
1016 
1017 	snprintf(card->name, MISDN_MAX_IDLEN - 1, "netjet.%d", nj_cnt + 1);
1018 	write_lock_irqsave(&card_lock, flags);
1019 	list_add_tail(&card->list, &Cards);
1020 	write_unlock_irqrestore(&card_lock, flags);
1021 
1022 	_set_debug(card);
1023 	card->isac.name = card->name;
1024 	spin_lock_init(&card->lock);
1025 	card->isac.hwlock = &card->lock;
1026 	mISDNisac_init(&card->isac, card);
1027 
1028 	card->isac.dch.dev.Bprotocols = (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
1029 		(1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
1030 	card->isac.dch.dev.D.ctrl = nj_dctrl;
1031 	for (i = 0; i < 2; i++) {
1032 		card->bc[i].bch.nr = i + 1;
1033 		set_channelmap(i + 1, card->isac.dch.dev.channelmap);
1034 		mISDN_initbchannel(&card->bc[i].bch, MAX_DATA_MEM,
1035 				   NJ_DMA_RXSIZE >> 1);
1036 		card->bc[i].bch.hw = card;
1037 		card->bc[i].bch.ch.send = nj_l2l1B;
1038 		card->bc[i].bch.ch.ctrl = nj_bctrl;
1039 		card->bc[i].bch.ch.nr = i + 1;
1040 		list_add(&card->bc[i].bch.ch.list,
1041 			 &card->isac.dch.dev.bchannels);
1042 		card->bc[i].bch.hw = card;
1043 	}
1044 	err = nj_setup(card);
1045 	if (err)
1046 		goto error;
1047 	err = mISDN_register_device(&card->isac.dch.dev, &card->pdev->dev,
1048 				    card->name);
1049 	if (err)
1050 		goto error;
1051 	err = nj_init_card(card);
1052 	if (!err)  {
1053 		nj_cnt++;
1054 		pr_notice("Netjet %d cards installed\n", nj_cnt);
1055 		return 0;
1056 	}
1057 error:
1058 	nj_release(card);
1059 	return err;
1060 }
1061 
1062 static int
1063 nj_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1064 {
1065 	int err = -ENOMEM;
1066 	int cfg;
1067 	struct tiger_hw *card;
1068 
1069 	if (pdev->subsystem_vendor == 0x8086 &&
1070 	    pdev->subsystem_device == 0x0003) {
1071 		pr_notice("Netjet: Digium X100P/X101P not handled\n");
1072 		return -ENODEV;
1073 	}
1074 
1075 	if (pdev->subsystem_vendor == 0x55 &&
1076 	    pdev->subsystem_device == 0x02) {
1077 		pr_notice("Netjet: Enter!Now not handled yet\n");
1078 		return -ENODEV;
1079 	}
1080 
1081 	if (pdev->subsystem_vendor == 0xb100 &&
1082 	    pdev->subsystem_device == 0x0003) {
1083 		pr_notice("Netjet: Digium TDM400P not handled yet\n");
1084 		return -ENODEV;
1085 	}
1086 
1087 	card = kzalloc(sizeof(struct tiger_hw), GFP_KERNEL);
1088 	if (!card) {
1089 		pr_info("No kmem for Netjet\n");
1090 		return err;
1091 	}
1092 
1093 	card->pdev = pdev;
1094 
1095 	err = pci_enable_device(pdev);
1096 	if (err) {
1097 		kfree(card);
1098 		return err;
1099 	}
1100 
1101 	printk(KERN_INFO "nj_probe(mISDN): found adapter at %s\n",
1102 	       pci_name(pdev));
1103 
1104 	pci_set_master(pdev);
1105 
1106 	/* the TJ300 and TJ320 must be detected, the IRQ handling is different
1107 	 * unfortunately the chips use the same device ID, but the TJ320 has
1108 	 * the bit20 in status PCI cfg register set
1109 	 */
1110 	pci_read_config_dword(pdev, 0x04, &cfg);
1111 	if (cfg & 0x00100000)
1112 		card->typ = NETJET_S_TJ320;
1113 	else
1114 		card->typ = NETJET_S_TJ300;
1115 
1116 	card->base = pci_resource_start(pdev, 0);
1117 	card->irq = pdev->irq;
1118 	pci_set_drvdata(pdev, card);
1119 	err = setup_instance(card);
1120 	if (err)
1121 		pci_set_drvdata(pdev, NULL);
1122 
1123 	return err;
1124 }
1125 
1126 
1127 static void nj_remove(struct pci_dev *pdev)
1128 {
1129 	struct tiger_hw *card = pci_get_drvdata(pdev);
1130 
1131 	if (card)
1132 		nj_release(card);
1133 	else
1134 		pr_info("%s drvdata already removed\n", __func__);
1135 }
1136 
1137 /* We cannot select cards with PCI_SUB... IDs, since here are cards with
1138  * SUB IDs set to PCI_ANY_ID, so we need to match all and reject
1139  * known other cards which not work with this driver - see probe function */
1140 static const struct pci_device_id nj_pci_ids[] = {
1141 	{ PCI_VENDOR_ID_TIGERJET, PCI_DEVICE_ID_TIGERJET_300,
1142 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
1143 	{ }
1144 };
1145 MODULE_DEVICE_TABLE(pci, nj_pci_ids);
1146 
1147 static struct pci_driver nj_driver = {
1148 	.name = "netjet",
1149 	.probe = nj_probe,
1150 	.remove = nj_remove,
1151 	.id_table = nj_pci_ids,
1152 };
1153 
1154 static int __init nj_init(void)
1155 {
1156 	int err;
1157 
1158 	pr_notice("Netjet PCI driver Rev. %s\n", NETJET_REV);
1159 	err = pci_register_driver(&nj_driver);
1160 	return err;
1161 }
1162 
1163 static void __exit nj_cleanup(void)
1164 {
1165 	pci_unregister_driver(&nj_driver);
1166 }
1167 
1168 module_init(nj_init);
1169 module_exit(nj_cleanup);
1170