1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * avm_fritz.c    low level stuff for AVM FRITZ!CARD PCI ISDN cards
4  *                Thanks to AVM, Berlin for informations
5  *
6  * Author       Karsten Keil <keil@isdn4linux.de>
7  *
8  * Copyright 2009  by Karsten Keil <keil@isdn4linux.de>
9  */
10 #include <linux/interrupt.h>
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/delay.h>
14 #include <linux/mISDNhw.h>
15 #include <linux/slab.h>
16 #include <asm/unaligned.h>
17 #include "ipac.h"
18 
19 
20 #define AVMFRITZ_REV	"2.3"
21 
22 static int AVM_cnt;
23 static int debug;
24 
25 enum {
26 	AVM_FRITZ_PCI,
27 	AVM_FRITZ_PCIV2,
28 };
29 
30 #define HDLC_FIFO		0x0
31 #define HDLC_STATUS		0x4
32 #define CHIP_WINDOW		0x10
33 
34 #define CHIP_INDEX		0x4
35 #define AVM_HDLC_1		0x00
36 #define AVM_HDLC_2		0x01
37 #define AVM_ISAC_FIFO		0x02
38 #define AVM_ISAC_REG_LOW	0x04
39 #define AVM_ISAC_REG_HIGH	0x06
40 
41 #define AVM_STATUS0_IRQ_ISAC	0x01
42 #define AVM_STATUS0_IRQ_HDLC	0x02
43 #define AVM_STATUS0_IRQ_TIMER	0x04
44 #define AVM_STATUS0_IRQ_MASK	0x07
45 
46 #define AVM_STATUS0_RESET	0x01
47 #define AVM_STATUS0_DIS_TIMER	0x02
48 #define AVM_STATUS0_RES_TIMER	0x04
49 #define AVM_STATUS0_ENA_IRQ	0x08
50 #define AVM_STATUS0_TESTBIT	0x10
51 
52 #define AVM_STATUS1_INT_SEL	0x0f
53 #define AVM_STATUS1_ENA_IOM	0x80
54 
55 #define HDLC_MODE_ITF_FLG	0x01
56 #define HDLC_MODE_TRANS		0x02
57 #define HDLC_MODE_CCR_7		0x04
58 #define HDLC_MODE_CCR_16	0x08
59 #define HDLC_FIFO_SIZE_128	0x20
60 #define HDLC_MODE_TESTLOOP	0x80
61 
62 #define HDLC_INT_XPR		0x80
63 #define HDLC_INT_XDU		0x40
64 #define HDLC_INT_RPR		0x20
65 #define HDLC_INT_MASK		0xE0
66 
67 #define HDLC_STAT_RME		0x01
68 #define HDLC_STAT_RDO		0x10
69 #define HDLC_STAT_CRCVFRRAB	0x0E
70 #define HDLC_STAT_CRCVFR	0x06
71 #define HDLC_STAT_RML_MASK_V1	0x3f00
72 #define HDLC_STAT_RML_MASK_V2	0x7f00
73 
74 #define HDLC_CMD_XRS		0x80
75 #define HDLC_CMD_XME		0x01
76 #define HDLC_CMD_RRS		0x20
77 #define HDLC_CMD_XML_MASK	0x3f00
78 
79 #define HDLC_FIFO_SIZE_V1	32
80 #define HDLC_FIFO_SIZE_V2	128
81 
82 /* Fritz PCI v2.0 */
83 
84 #define AVM_HDLC_FIFO_1		0x10
85 #define AVM_HDLC_FIFO_2		0x18
86 
87 #define AVM_HDLC_STATUS_1	0x14
88 #define AVM_HDLC_STATUS_2	0x1c
89 
90 #define AVM_ISACX_INDEX		0x04
91 #define AVM_ISACX_DATA		0x08
92 
93 /* data struct */
94 #define LOG_SIZE		63
95 
96 struct hdlc_stat_reg {
97 #ifdef __BIG_ENDIAN
98 	u8 fill;
99 	u8 mode;
100 	u8 xml;
101 	u8 cmd;
102 #else
103 	u8 cmd;
104 	u8 xml;
105 	u8 mode;
106 	u8 fill;
107 #endif
108 } __attribute__((packed));
109 
110 struct hdlc_hw {
111 	union {
112 		u32 ctrl;
113 		struct hdlc_stat_reg sr;
114 	} ctrl;
115 	u32 stat;
116 };
117 
118 struct fritzcard {
119 	struct list_head	list;
120 	struct pci_dev		*pdev;
121 	char			name[MISDN_MAX_IDLEN];
122 	u8			type;
123 	u8			ctrlreg;
124 	u16			irq;
125 	u32			irqcnt;
126 	u32			addr;
127 	spinlock_t		lock; /* hw lock */
128 	struct isac_hw		isac;
129 	struct hdlc_hw		hdlc[2];
130 	struct bchannel		bch[2];
131 	char			log[LOG_SIZE + 1];
132 };
133 
134 static LIST_HEAD(Cards);
135 static DEFINE_RWLOCK(card_lock); /* protect Cards */
136 
137 static void
138 _set_debug(struct fritzcard *card)
139 {
140 	card->isac.dch.debug = debug;
141 	card->bch[0].debug = debug;
142 	card->bch[1].debug = debug;
143 }
144 
145 static int
146 set_debug(const char *val, const struct kernel_param *kp)
147 {
148 	int ret;
149 	struct fritzcard *card;
150 
151 	ret = param_set_uint(val, kp);
152 	if (!ret) {
153 		read_lock(&card_lock);
154 		list_for_each_entry(card, &Cards, list)
155 			_set_debug(card);
156 		read_unlock(&card_lock);
157 	}
158 	return ret;
159 }
160 
161 MODULE_AUTHOR("Karsten Keil");
162 MODULE_LICENSE("GPL v2");
163 MODULE_VERSION(AVMFRITZ_REV);
164 module_param_call(debug, set_debug, param_get_uint, &debug, S_IRUGO | S_IWUSR);
165 MODULE_PARM_DESC(debug, "avmfritz debug mask");
166 
167 /* Interface functions */
168 
169 static u8
170 ReadISAC_V1(void *p, u8 offset)
171 {
172 	struct fritzcard *fc = p;
173 	u8 idx = (offset > 0x2f) ? AVM_ISAC_REG_HIGH : AVM_ISAC_REG_LOW;
174 
175 	outb(idx, fc->addr + CHIP_INDEX);
176 	return inb(fc->addr + CHIP_WINDOW + (offset & 0xf));
177 }
178 
179 static void
180 WriteISAC_V1(void *p, u8 offset, u8 value)
181 {
182 	struct fritzcard *fc = p;
183 	u8 idx = (offset > 0x2f) ? AVM_ISAC_REG_HIGH : AVM_ISAC_REG_LOW;
184 
185 	outb(idx, fc->addr + CHIP_INDEX);
186 	outb(value, fc->addr + CHIP_WINDOW + (offset & 0xf));
187 }
188 
189 static void
190 ReadFiFoISAC_V1(void *p, u8 off, u8 *data, int size)
191 {
192 	struct fritzcard *fc = p;
193 
194 	outb(AVM_ISAC_FIFO, fc->addr + CHIP_INDEX);
195 	insb(fc->addr + CHIP_WINDOW, data, size);
196 }
197 
198 static void
199 WriteFiFoISAC_V1(void *p, u8 off, u8 *data, int size)
200 {
201 	struct fritzcard *fc = p;
202 
203 	outb(AVM_ISAC_FIFO, fc->addr + CHIP_INDEX);
204 	outsb(fc->addr + CHIP_WINDOW, data, size);
205 }
206 
207 static u8
208 ReadISAC_V2(void *p, u8 offset)
209 {
210 	struct fritzcard *fc = p;
211 
212 	outl(offset, fc->addr + AVM_ISACX_INDEX);
213 	return 0xff & inl(fc->addr + AVM_ISACX_DATA);
214 }
215 
216 static void
217 WriteISAC_V2(void *p, u8 offset, u8 value)
218 {
219 	struct fritzcard *fc = p;
220 
221 	outl(offset, fc->addr + AVM_ISACX_INDEX);
222 	outl(value, fc->addr + AVM_ISACX_DATA);
223 }
224 
225 static void
226 ReadFiFoISAC_V2(void *p, u8 off, u8 *data, int size)
227 {
228 	struct fritzcard *fc = p;
229 	int i;
230 
231 	outl(off, fc->addr + AVM_ISACX_INDEX);
232 	for (i = 0; i < size; i++)
233 		data[i] = 0xff & inl(fc->addr + AVM_ISACX_DATA);
234 }
235 
236 static void
237 WriteFiFoISAC_V2(void *p, u8 off, u8 *data, int size)
238 {
239 	struct fritzcard *fc = p;
240 	int i;
241 
242 	outl(off, fc->addr + AVM_ISACX_INDEX);
243 	for (i = 0; i < size; i++)
244 		outl(data[i], fc->addr + AVM_ISACX_DATA);
245 }
246 
247 static struct bchannel *
248 Sel_BCS(struct fritzcard *fc, u32 channel)
249 {
250 	if (test_bit(FLG_ACTIVE, &fc->bch[0].Flags) &&
251 	    (fc->bch[0].nr & channel))
252 		return &fc->bch[0];
253 	else if (test_bit(FLG_ACTIVE, &fc->bch[1].Flags) &&
254 		 (fc->bch[1].nr & channel))
255 		return &fc->bch[1];
256 	else
257 		return NULL;
258 }
259 
260 static inline void
261 __write_ctrl_pci(struct fritzcard *fc, struct hdlc_hw *hdlc, u32 channel) {
262 	u32 idx = channel == 2 ? AVM_HDLC_2 : AVM_HDLC_1;
263 
264 	outl(idx, fc->addr + CHIP_INDEX);
265 	outl(hdlc->ctrl.ctrl, fc->addr + CHIP_WINDOW + HDLC_STATUS);
266 }
267 
268 static inline void
269 __write_ctrl_pciv2(struct fritzcard *fc, struct hdlc_hw *hdlc, u32 channel) {
270 	outl(hdlc->ctrl.ctrl, fc->addr + (channel == 2 ? AVM_HDLC_STATUS_2 :
271 					  AVM_HDLC_STATUS_1));
272 }
273 
274 static void
275 write_ctrl(struct bchannel *bch, int which) {
276 	struct fritzcard *fc = bch->hw;
277 	struct hdlc_hw *hdlc;
278 
279 	hdlc = &fc->hdlc[(bch->nr - 1) & 1];
280 	pr_debug("%s: hdlc %c wr%x ctrl %x\n", fc->name, '@' + bch->nr,
281 		 which, hdlc->ctrl.ctrl);
282 	switch (fc->type) {
283 	case AVM_FRITZ_PCIV2:
284 		__write_ctrl_pciv2(fc, hdlc, bch->nr);
285 		break;
286 	case AVM_FRITZ_PCI:
287 		__write_ctrl_pci(fc, hdlc, bch->nr);
288 		break;
289 	}
290 }
291 
292 
293 static inline u32
294 __read_status_pci(u_long addr, u32 channel)
295 {
296 	outl(channel == 2 ? AVM_HDLC_2 : AVM_HDLC_1, addr + CHIP_INDEX);
297 	return inl(addr + CHIP_WINDOW + HDLC_STATUS);
298 }
299 
300 static inline u32
301 __read_status_pciv2(u_long addr, u32 channel)
302 {
303 	return inl(addr + (channel == 2 ? AVM_HDLC_STATUS_2 :
304 			   AVM_HDLC_STATUS_1));
305 }
306 
307 
308 static u32
309 read_status(struct fritzcard *fc, u32 channel)
310 {
311 	switch (fc->type) {
312 	case AVM_FRITZ_PCIV2:
313 		return __read_status_pciv2(fc->addr, channel);
314 	case AVM_FRITZ_PCI:
315 		return __read_status_pci(fc->addr, channel);
316 	}
317 	/* dummy */
318 	return 0;
319 }
320 
321 static void
322 enable_hwirq(struct fritzcard *fc)
323 {
324 	fc->ctrlreg |= AVM_STATUS0_ENA_IRQ;
325 	outb(fc->ctrlreg, fc->addr + 2);
326 }
327 
328 static void
329 disable_hwirq(struct fritzcard *fc)
330 {
331 	fc->ctrlreg &= ~AVM_STATUS0_ENA_IRQ;
332 	outb(fc->ctrlreg, fc->addr + 2);
333 }
334 
335 static int
336 modehdlc(struct bchannel *bch, int protocol)
337 {
338 	struct fritzcard *fc = bch->hw;
339 	struct hdlc_hw *hdlc;
340 	u8 mode;
341 
342 	hdlc = &fc->hdlc[(bch->nr - 1) & 1];
343 	pr_debug("%s: hdlc %c protocol %x-->%x ch %d\n", fc->name,
344 		 '@' + bch->nr, bch->state, protocol, bch->nr);
345 	hdlc->ctrl.ctrl = 0;
346 	mode = (fc->type == AVM_FRITZ_PCIV2) ? HDLC_FIFO_SIZE_128 : 0;
347 
348 	switch (protocol) {
349 	case -1: /* used for init */
350 		bch->state = -1;
351 		fallthrough;
352 	case ISDN_P_NONE:
353 		if (bch->state == ISDN_P_NONE)
354 			break;
355 		hdlc->ctrl.sr.cmd  = HDLC_CMD_XRS | HDLC_CMD_RRS;
356 		hdlc->ctrl.sr.mode = mode | HDLC_MODE_TRANS;
357 		write_ctrl(bch, 5);
358 		bch->state = ISDN_P_NONE;
359 		test_and_clear_bit(FLG_HDLC, &bch->Flags);
360 		test_and_clear_bit(FLG_TRANSPARENT, &bch->Flags);
361 		break;
362 	case ISDN_P_B_RAW:
363 		bch->state = protocol;
364 		hdlc->ctrl.sr.cmd  = HDLC_CMD_XRS | HDLC_CMD_RRS;
365 		hdlc->ctrl.sr.mode = mode | HDLC_MODE_TRANS;
366 		write_ctrl(bch, 5);
367 		hdlc->ctrl.sr.cmd = HDLC_CMD_XRS;
368 		write_ctrl(bch, 1);
369 		hdlc->ctrl.sr.cmd = 0;
370 		test_and_set_bit(FLG_TRANSPARENT, &bch->Flags);
371 		break;
372 	case ISDN_P_B_HDLC:
373 		bch->state = protocol;
374 		hdlc->ctrl.sr.cmd  = HDLC_CMD_XRS | HDLC_CMD_RRS;
375 		hdlc->ctrl.sr.mode = mode | HDLC_MODE_ITF_FLG;
376 		write_ctrl(bch, 5);
377 		hdlc->ctrl.sr.cmd = HDLC_CMD_XRS;
378 		write_ctrl(bch, 1);
379 		hdlc->ctrl.sr.cmd = 0;
380 		test_and_set_bit(FLG_HDLC, &bch->Flags);
381 		break;
382 	default:
383 		pr_info("%s: protocol not known %x\n", fc->name, protocol);
384 		return -ENOPROTOOPT;
385 	}
386 	return 0;
387 }
388 
389 static void
390 hdlc_empty_fifo(struct bchannel *bch, int count)
391 {
392 	u32 *ptr;
393 	u8 *p;
394 	u32  val, addr;
395 	int cnt;
396 	struct fritzcard *fc = bch->hw;
397 
398 	pr_debug("%s: %s %d\n", fc->name, __func__, count);
399 	if (test_bit(FLG_RX_OFF, &bch->Flags)) {
400 		p = NULL;
401 		bch->dropcnt += count;
402 	} else {
403 		cnt = bchannel_get_rxbuf(bch, count);
404 		if (cnt < 0) {
405 			pr_warn("%s.B%d: No bufferspace for %d bytes\n",
406 				fc->name, bch->nr, count);
407 			return;
408 		}
409 		p = skb_put(bch->rx_skb, count);
410 	}
411 	ptr = (u32 *)p;
412 	if (fc->type == AVM_FRITZ_PCIV2)
413 		addr = fc->addr + (bch->nr == 2 ?
414 				   AVM_HDLC_FIFO_2 : AVM_HDLC_FIFO_1);
415 	else {
416 		addr = fc->addr + CHIP_WINDOW;
417 		outl(bch->nr == 2 ? AVM_HDLC_2 : AVM_HDLC_1, fc->addr);
418 	}
419 	cnt = 0;
420 	while (cnt < count) {
421 		val = le32_to_cpu(inl(addr));
422 		if (p) {
423 			put_unaligned(val, ptr);
424 			ptr++;
425 		}
426 		cnt += 4;
427 	}
428 	if (p && (debug & DEBUG_HW_BFIFO)) {
429 		snprintf(fc->log, LOG_SIZE, "B%1d-recv %s %d ",
430 			 bch->nr, fc->name, count);
431 		print_hex_dump_bytes(fc->log, DUMP_PREFIX_OFFSET, p, count);
432 	}
433 }
434 
435 static void
436 hdlc_fill_fifo(struct bchannel *bch)
437 {
438 	struct fritzcard *fc = bch->hw;
439 	struct hdlc_hw *hdlc;
440 	int count, fs, cnt = 0, idx;
441 	bool fillempty = false;
442 	u8 *p;
443 	u32 *ptr, val, addr;
444 
445 	idx = (bch->nr - 1) & 1;
446 	hdlc = &fc->hdlc[idx];
447 	fs = (fc->type == AVM_FRITZ_PCIV2) ?
448 		HDLC_FIFO_SIZE_V2 : HDLC_FIFO_SIZE_V1;
449 	if (!bch->tx_skb) {
450 		if (!test_bit(FLG_TX_EMPTY, &bch->Flags))
451 			return;
452 		count = fs;
453 		p = bch->fill;
454 		fillempty = true;
455 	} else {
456 		count = bch->tx_skb->len - bch->tx_idx;
457 		if (count <= 0)
458 			return;
459 		p = bch->tx_skb->data + bch->tx_idx;
460 	}
461 	hdlc->ctrl.sr.cmd &= ~HDLC_CMD_XME;
462 	if (count > fs) {
463 		count = fs;
464 	} else {
465 		if (test_bit(FLG_HDLC, &bch->Flags))
466 			hdlc->ctrl.sr.cmd |= HDLC_CMD_XME;
467 	}
468 	ptr = (u32 *)p;
469 	if (!fillempty) {
470 		pr_debug("%s.B%d: %d/%d/%d", fc->name, bch->nr, count,
471 			 bch->tx_idx, bch->tx_skb->len);
472 		bch->tx_idx += count;
473 	} else {
474 		pr_debug("%s.B%d: fillempty %d\n", fc->name, bch->nr, count);
475 	}
476 	hdlc->ctrl.sr.xml = ((count == fs) ? 0 : count);
477 	if (fc->type == AVM_FRITZ_PCIV2) {
478 		__write_ctrl_pciv2(fc, hdlc, bch->nr);
479 		addr = fc->addr + (bch->nr == 2 ?
480 				   AVM_HDLC_FIFO_2 : AVM_HDLC_FIFO_1);
481 	} else {
482 		__write_ctrl_pci(fc, hdlc, bch->nr);
483 		addr = fc->addr + CHIP_WINDOW;
484 	}
485 	if (fillempty) {
486 		while (cnt < count) {
487 			/* all bytes the same - no worry about endian */
488 			outl(*ptr, addr);
489 			cnt += 4;
490 		}
491 	} else {
492 		while (cnt < count) {
493 			val = get_unaligned(ptr);
494 			outl(cpu_to_le32(val), addr);
495 			ptr++;
496 			cnt += 4;
497 		}
498 	}
499 	if ((debug & DEBUG_HW_BFIFO) && !fillempty) {
500 		snprintf(fc->log, LOG_SIZE, "B%1d-send %s %d ",
501 			 bch->nr, fc->name, count);
502 		print_hex_dump_bytes(fc->log, DUMP_PREFIX_OFFSET, p, count);
503 	}
504 }
505 
506 static void
507 HDLC_irq_xpr(struct bchannel *bch)
508 {
509 	if (bch->tx_skb && bch->tx_idx < bch->tx_skb->len) {
510 		hdlc_fill_fifo(bch);
511 	} else {
512 		dev_kfree_skb(bch->tx_skb);
513 		if (get_next_bframe(bch)) {
514 			hdlc_fill_fifo(bch);
515 			test_and_clear_bit(FLG_TX_EMPTY, &bch->Flags);
516 		} else if (test_bit(FLG_TX_EMPTY, &bch->Flags)) {
517 			hdlc_fill_fifo(bch);
518 		}
519 	}
520 }
521 
522 static void
523 HDLC_irq(struct bchannel *bch, u32 stat)
524 {
525 	struct fritzcard *fc = bch->hw;
526 	int		len, fs;
527 	u32		rmlMask;
528 	struct hdlc_hw	*hdlc;
529 
530 	hdlc = &fc->hdlc[(bch->nr - 1) & 1];
531 	pr_debug("%s: ch%d stat %#x\n", fc->name, bch->nr, stat);
532 	if (fc->type == AVM_FRITZ_PCIV2) {
533 		rmlMask = HDLC_STAT_RML_MASK_V2;
534 		fs = HDLC_FIFO_SIZE_V2;
535 	} else {
536 		rmlMask = HDLC_STAT_RML_MASK_V1;
537 		fs = HDLC_FIFO_SIZE_V1;
538 	}
539 	if (stat & HDLC_INT_RPR) {
540 		if (stat & HDLC_STAT_RDO) {
541 			pr_warn("%s: ch%d stat %x RDO\n",
542 				fc->name, bch->nr, stat);
543 			hdlc->ctrl.sr.xml = 0;
544 			hdlc->ctrl.sr.cmd |= HDLC_CMD_RRS;
545 			write_ctrl(bch, 1);
546 			hdlc->ctrl.sr.cmd &= ~HDLC_CMD_RRS;
547 			write_ctrl(bch, 1);
548 			if (bch->rx_skb)
549 				skb_trim(bch->rx_skb, 0);
550 		} else {
551 			len = (stat & rmlMask) >> 8;
552 			if (!len)
553 				len = fs;
554 			hdlc_empty_fifo(bch, len);
555 			if (!bch->rx_skb)
556 				goto handle_tx;
557 			if (test_bit(FLG_TRANSPARENT, &bch->Flags)) {
558 				recv_Bchannel(bch, 0, false);
559 			} else if (stat & HDLC_STAT_RME) {
560 				if ((stat & HDLC_STAT_CRCVFRRAB) ==
561 				    HDLC_STAT_CRCVFR) {
562 					recv_Bchannel(bch, 0, false);
563 				} else {
564 					pr_warn("%s: got invalid frame\n",
565 						fc->name);
566 					skb_trim(bch->rx_skb, 0);
567 				}
568 			}
569 		}
570 	}
571 handle_tx:
572 	if (stat & HDLC_INT_XDU) {
573 		/* Here we lost an TX interrupt, so
574 		 * restart transmitting the whole frame on HDLC
575 		 * in transparent mode we send the next data
576 		 */
577 		pr_warn("%s: ch%d stat %x XDU %s\n", fc->name, bch->nr,
578 			stat, bch->tx_skb ? "tx_skb" : "no tx_skb");
579 		if (bch->tx_skb && bch->tx_skb->len) {
580 			if (!test_bit(FLG_TRANSPARENT, &bch->Flags))
581 				bch->tx_idx = 0;
582 		} else if (test_bit(FLG_FILLEMPTY, &bch->Flags)) {
583 			test_and_set_bit(FLG_TX_EMPTY, &bch->Flags);
584 		}
585 		hdlc->ctrl.sr.xml = 0;
586 		hdlc->ctrl.sr.cmd |= HDLC_CMD_XRS;
587 		write_ctrl(bch, 1);
588 		hdlc->ctrl.sr.cmd &= ~HDLC_CMD_XRS;
589 		HDLC_irq_xpr(bch);
590 		return;
591 	} else if (stat & HDLC_INT_XPR)
592 		HDLC_irq_xpr(bch);
593 }
594 
595 static inline void
596 HDLC_irq_main(struct fritzcard *fc)
597 {
598 	u32 stat;
599 	struct bchannel *bch;
600 
601 	stat = read_status(fc, 1);
602 	if (stat & HDLC_INT_MASK) {
603 		bch = Sel_BCS(fc, 1);
604 		if (bch)
605 			HDLC_irq(bch, stat);
606 		else
607 			pr_debug("%s: spurious ch1 IRQ\n", fc->name);
608 	}
609 	stat = read_status(fc, 2);
610 	if (stat & HDLC_INT_MASK) {
611 		bch = Sel_BCS(fc, 2);
612 		if (bch)
613 			HDLC_irq(bch, stat);
614 		else
615 			pr_debug("%s: spurious ch2 IRQ\n", fc->name);
616 	}
617 }
618 
619 static irqreturn_t
620 avm_fritz_interrupt(int intno, void *dev_id)
621 {
622 	struct fritzcard *fc = dev_id;
623 	u8 val;
624 	u8 sval;
625 
626 	spin_lock(&fc->lock);
627 	sval = inb(fc->addr + 2);
628 	pr_debug("%s: irq stat0 %x\n", fc->name, sval);
629 	if ((sval & AVM_STATUS0_IRQ_MASK) == AVM_STATUS0_IRQ_MASK) {
630 		/* shared  IRQ from other HW */
631 		spin_unlock(&fc->lock);
632 		return IRQ_NONE;
633 	}
634 	fc->irqcnt++;
635 
636 	if (!(sval & AVM_STATUS0_IRQ_ISAC)) {
637 		val = ReadISAC_V1(fc, ISAC_ISTA);
638 		mISDNisac_irq(&fc->isac, val);
639 	}
640 	if (!(sval & AVM_STATUS0_IRQ_HDLC))
641 		HDLC_irq_main(fc);
642 	spin_unlock(&fc->lock);
643 	return IRQ_HANDLED;
644 }
645 
646 static irqreturn_t
647 avm_fritzv2_interrupt(int intno, void *dev_id)
648 {
649 	struct fritzcard *fc = dev_id;
650 	u8 val;
651 	u8 sval;
652 
653 	spin_lock(&fc->lock);
654 	sval = inb(fc->addr + 2);
655 	pr_debug("%s: irq stat0 %x\n", fc->name, sval);
656 	if (!(sval & AVM_STATUS0_IRQ_MASK)) {
657 		/* shared  IRQ from other HW */
658 		spin_unlock(&fc->lock);
659 		return IRQ_NONE;
660 	}
661 	fc->irqcnt++;
662 
663 	if (sval & AVM_STATUS0_IRQ_HDLC)
664 		HDLC_irq_main(fc);
665 	if (sval & AVM_STATUS0_IRQ_ISAC) {
666 		val = ReadISAC_V2(fc, ISACX_ISTA);
667 		mISDNisac_irq(&fc->isac, val);
668 	}
669 	if (sval & AVM_STATUS0_IRQ_TIMER) {
670 		pr_debug("%s: timer irq\n", fc->name);
671 		outb(fc->ctrlreg | AVM_STATUS0_RES_TIMER, fc->addr + 2);
672 		udelay(1);
673 		outb(fc->ctrlreg, fc->addr + 2);
674 	}
675 	spin_unlock(&fc->lock);
676 	return IRQ_HANDLED;
677 }
678 
679 static int
680 avm_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
681 {
682 	struct bchannel *bch = container_of(ch, struct bchannel, ch);
683 	struct fritzcard *fc = bch->hw;
684 	int ret = -EINVAL;
685 	struct mISDNhead *hh = mISDN_HEAD_P(skb);
686 	unsigned long flags;
687 
688 	switch (hh->prim) {
689 	case PH_DATA_REQ:
690 		spin_lock_irqsave(&fc->lock, flags);
691 		ret = bchannel_senddata(bch, skb);
692 		if (ret > 0) { /* direct TX */
693 			hdlc_fill_fifo(bch);
694 			ret = 0;
695 		}
696 		spin_unlock_irqrestore(&fc->lock, flags);
697 		return ret;
698 	case PH_ACTIVATE_REQ:
699 		spin_lock_irqsave(&fc->lock, flags);
700 		if (!test_and_set_bit(FLG_ACTIVE, &bch->Flags))
701 			ret = modehdlc(bch, ch->protocol);
702 		else
703 			ret = 0;
704 		spin_unlock_irqrestore(&fc->lock, flags);
705 		if (!ret)
706 			_queue_data(ch, PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
707 				    NULL, GFP_KERNEL);
708 		break;
709 	case PH_DEACTIVATE_REQ:
710 		spin_lock_irqsave(&fc->lock, flags);
711 		mISDN_clear_bchannel(bch);
712 		modehdlc(bch, ISDN_P_NONE);
713 		spin_unlock_irqrestore(&fc->lock, flags);
714 		_queue_data(ch, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
715 			    NULL, GFP_KERNEL);
716 		ret = 0;
717 		break;
718 	}
719 	if (!ret)
720 		dev_kfree_skb(skb);
721 	return ret;
722 }
723 
724 static void
725 inithdlc(struct fritzcard *fc)
726 {
727 	modehdlc(&fc->bch[0], -1);
728 	modehdlc(&fc->bch[1], -1);
729 }
730 
731 static void
732 clear_pending_hdlc_ints(struct fritzcard *fc)
733 {
734 	u32 val;
735 
736 	val = read_status(fc, 1);
737 	pr_debug("%s: HDLC 1 STA %x\n", fc->name, val);
738 	val = read_status(fc, 2);
739 	pr_debug("%s: HDLC 2 STA %x\n", fc->name, val);
740 }
741 
742 static void
743 reset_avm(struct fritzcard *fc)
744 {
745 	switch (fc->type) {
746 	case AVM_FRITZ_PCI:
747 		fc->ctrlreg = AVM_STATUS0_RESET | AVM_STATUS0_DIS_TIMER;
748 		break;
749 	case AVM_FRITZ_PCIV2:
750 		fc->ctrlreg = AVM_STATUS0_RESET;
751 		break;
752 	}
753 	if (debug & DEBUG_HW)
754 		pr_notice("%s: reset\n", fc->name);
755 	disable_hwirq(fc);
756 	mdelay(5);
757 	switch (fc->type) {
758 	case AVM_FRITZ_PCI:
759 		fc->ctrlreg = AVM_STATUS0_DIS_TIMER | AVM_STATUS0_RES_TIMER;
760 		disable_hwirq(fc);
761 		outb(AVM_STATUS1_ENA_IOM, fc->addr + 3);
762 		break;
763 	case AVM_FRITZ_PCIV2:
764 		fc->ctrlreg = 0;
765 		disable_hwirq(fc);
766 		break;
767 	}
768 	mdelay(1);
769 	if (debug & DEBUG_HW)
770 		pr_notice("%s: S0/S1 %x/%x\n", fc->name,
771 			  inb(fc->addr + 2), inb(fc->addr + 3));
772 }
773 
774 static int
775 init_card(struct fritzcard *fc)
776 {
777 	int		ret, cnt = 3;
778 	u_long		flags;
779 
780 	reset_avm(fc); /* disable IRQ */
781 	if (fc->type == AVM_FRITZ_PCIV2)
782 		ret = request_irq(fc->irq, avm_fritzv2_interrupt,
783 				  IRQF_SHARED, fc->name, fc);
784 	else
785 		ret = request_irq(fc->irq, avm_fritz_interrupt,
786 				  IRQF_SHARED, fc->name, fc);
787 	if (ret) {
788 		pr_info("%s: couldn't get interrupt %d\n",
789 			fc->name, fc->irq);
790 		return ret;
791 	}
792 	while (cnt--) {
793 		spin_lock_irqsave(&fc->lock, flags);
794 		ret = fc->isac.init(&fc->isac);
795 		if (ret) {
796 			spin_unlock_irqrestore(&fc->lock, flags);
797 			pr_info("%s: ISAC init failed with %d\n",
798 				fc->name, ret);
799 			break;
800 		}
801 		clear_pending_hdlc_ints(fc);
802 		inithdlc(fc);
803 		enable_hwirq(fc);
804 		/* RESET Receiver and Transmitter */
805 		if (fc->type == AVM_FRITZ_PCIV2) {
806 			WriteISAC_V2(fc, ISACX_MASK, 0);
807 			WriteISAC_V2(fc, ISACX_CMDRD, 0x41);
808 		} else {
809 			WriteISAC_V1(fc, ISAC_MASK, 0);
810 			WriteISAC_V1(fc, ISAC_CMDR, 0x41);
811 		}
812 		spin_unlock_irqrestore(&fc->lock, flags);
813 		/* Timeout 10ms */
814 		msleep_interruptible(10);
815 		if (debug & DEBUG_HW)
816 			pr_notice("%s: IRQ %d count %d\n", fc->name,
817 				  fc->irq, fc->irqcnt);
818 		if (!fc->irqcnt) {
819 			pr_info("%s: IRQ(%d) getting no IRQs during init %d\n",
820 				fc->name, fc->irq, 3 - cnt);
821 			reset_avm(fc);
822 		} else
823 			return 0;
824 	}
825 	free_irq(fc->irq, fc);
826 	return -EIO;
827 }
828 
829 static int
830 channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
831 {
832 	return mISDN_ctrl_bchannel(bch, cq);
833 }
834 
835 static int
836 avm_bctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
837 {
838 	struct bchannel *bch = container_of(ch, struct bchannel, ch);
839 	struct fritzcard *fc = bch->hw;
840 	int ret = -EINVAL;
841 	u_long flags;
842 
843 	pr_debug("%s: %s cmd:%x %p\n", fc->name, __func__, cmd, arg);
844 	switch (cmd) {
845 	case CLOSE_CHANNEL:
846 		test_and_clear_bit(FLG_OPEN, &bch->Flags);
847 		cancel_work_sync(&bch->workq);
848 		spin_lock_irqsave(&fc->lock, flags);
849 		mISDN_clear_bchannel(bch);
850 		modehdlc(bch, ISDN_P_NONE);
851 		spin_unlock_irqrestore(&fc->lock, flags);
852 		ch->protocol = ISDN_P_NONE;
853 		ch->peer = NULL;
854 		module_put(THIS_MODULE);
855 		ret = 0;
856 		break;
857 	case CONTROL_CHANNEL:
858 		ret = channel_bctrl(bch, arg);
859 		break;
860 	default:
861 		pr_info("%s: %s unknown prim(%x)\n", fc->name, __func__, cmd);
862 	}
863 	return ret;
864 }
865 
866 static int
867 channel_ctrl(struct fritzcard  *fc, struct mISDN_ctrl_req *cq)
868 {
869 	int	ret = 0;
870 
871 	switch (cq->op) {
872 	case MISDN_CTRL_GETOP:
873 		cq->op = MISDN_CTRL_LOOP | MISDN_CTRL_L1_TIMER3;
874 		break;
875 	case MISDN_CTRL_LOOP:
876 		/* cq->channel: 0 disable, 1 B1 loop 2 B2 loop, 3 both */
877 		if (cq->channel < 0 || cq->channel > 3) {
878 			ret = -EINVAL;
879 			break;
880 		}
881 		ret = fc->isac.ctrl(&fc->isac, HW_TESTLOOP, cq->channel);
882 		break;
883 	case MISDN_CTRL_L1_TIMER3:
884 		ret = fc->isac.ctrl(&fc->isac, HW_TIMER3_VALUE, cq->p1);
885 		break;
886 	default:
887 		pr_info("%s: %s unknown Op %x\n", fc->name, __func__, cq->op);
888 		ret = -EINVAL;
889 		break;
890 	}
891 	return ret;
892 }
893 
894 static int
895 open_bchannel(struct fritzcard *fc, struct channel_req *rq)
896 {
897 	struct bchannel		*bch;
898 
899 	if (rq->adr.channel == 0 || rq->adr.channel > 2)
900 		return -EINVAL;
901 	if (rq->protocol == ISDN_P_NONE)
902 		return -EINVAL;
903 	bch = &fc->bch[rq->adr.channel - 1];
904 	if (test_and_set_bit(FLG_OPEN, &bch->Flags))
905 		return -EBUSY; /* b-channel can be only open once */
906 	bch->ch.protocol = rq->protocol;
907 	rq->ch = &bch->ch;
908 	return 0;
909 }
910 
911 /*
912  * device control function
913  */
914 static int
915 avm_dctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
916 {
917 	struct mISDNdevice	*dev = container_of(ch, struct mISDNdevice, D);
918 	struct dchannel		*dch = container_of(dev, struct dchannel, dev);
919 	struct fritzcard	*fc = dch->hw;
920 	struct channel_req	*rq;
921 	int			err = 0;
922 
923 	pr_debug("%s: %s cmd:%x %p\n", fc->name, __func__, cmd, arg);
924 	switch (cmd) {
925 	case OPEN_CHANNEL:
926 		rq = arg;
927 		if (rq->protocol == ISDN_P_TE_S0)
928 			err = fc->isac.open(&fc->isac, rq);
929 		else
930 			err = open_bchannel(fc, rq);
931 		if (err)
932 			break;
933 		if (!try_module_get(THIS_MODULE))
934 			pr_info("%s: cannot get module\n", fc->name);
935 		break;
936 	case CLOSE_CHANNEL:
937 		pr_debug("%s: dev(%d) close from %p\n", fc->name, dch->dev.id,
938 			 __builtin_return_address(0));
939 		module_put(THIS_MODULE);
940 		break;
941 	case CONTROL_CHANNEL:
942 		err = channel_ctrl(fc, arg);
943 		break;
944 	default:
945 		pr_debug("%s: %s unknown command %x\n",
946 			 fc->name, __func__, cmd);
947 		return -EINVAL;
948 	}
949 	return err;
950 }
951 
952 static int
953 setup_fritz(struct fritzcard *fc)
954 {
955 	u32 val, ver;
956 
957 	if (!request_region(fc->addr, 32, fc->name)) {
958 		pr_info("%s: AVM config port %x-%x already in use\n",
959 			fc->name, fc->addr, fc->addr + 31);
960 		return -EIO;
961 	}
962 	switch (fc->type) {
963 	case AVM_FRITZ_PCI:
964 		val = inl(fc->addr);
965 		outl(AVM_HDLC_1, fc->addr + CHIP_INDEX);
966 		ver = inl(fc->addr + CHIP_WINDOW + HDLC_STATUS) >> 24;
967 		if (debug & DEBUG_HW) {
968 			pr_notice("%s: PCI stat %#x\n", fc->name, val);
969 			pr_notice("%s: PCI Class %X Rev %d\n", fc->name,
970 				  val & 0xff, (val >> 8) & 0xff);
971 			pr_notice("%s: HDLC version %x\n", fc->name, ver & 0xf);
972 		}
973 		ASSIGN_FUNC(V1, ISAC, fc->isac);
974 		fc->isac.type = IPAC_TYPE_ISAC;
975 		break;
976 	case AVM_FRITZ_PCIV2:
977 		val = inl(fc->addr);
978 		ver = inl(fc->addr + AVM_HDLC_STATUS_1) >> 24;
979 		if (debug & DEBUG_HW) {
980 			pr_notice("%s: PCI V2 stat %#x\n", fc->name, val);
981 			pr_notice("%s: PCI V2 Class %X Rev %d\n", fc->name,
982 				  val & 0xff, (val >> 8) & 0xff);
983 			pr_notice("%s: HDLC version %x\n", fc->name, ver & 0xf);
984 		}
985 		ASSIGN_FUNC(V2, ISAC, fc->isac);
986 		fc->isac.type = IPAC_TYPE_ISACX;
987 		break;
988 	default:
989 		release_region(fc->addr, 32);
990 		pr_info("%s: AVM unknown type %d\n", fc->name, fc->type);
991 		return -ENODEV;
992 	}
993 	pr_notice("%s: %s config irq:%d base:0x%X\n", fc->name,
994 		  (fc->type == AVM_FRITZ_PCI) ? "AVM Fritz!CARD PCI" :
995 		  "AVM Fritz!CARD PCIv2", fc->irq, fc->addr);
996 	return 0;
997 }
998 
999 static void
1000 release_card(struct fritzcard *card)
1001 {
1002 	u_long flags;
1003 
1004 	disable_hwirq(card);
1005 	spin_lock_irqsave(&card->lock, flags);
1006 	modehdlc(&card->bch[0], ISDN_P_NONE);
1007 	modehdlc(&card->bch[1], ISDN_P_NONE);
1008 	spin_unlock_irqrestore(&card->lock, flags);
1009 	card->isac.release(&card->isac);
1010 	free_irq(card->irq, card);
1011 	mISDN_freebchannel(&card->bch[1]);
1012 	mISDN_freebchannel(&card->bch[0]);
1013 	mISDN_unregister_device(&card->isac.dch.dev);
1014 	release_region(card->addr, 32);
1015 	pci_disable_device(card->pdev);
1016 	pci_set_drvdata(card->pdev, NULL);
1017 	write_lock_irqsave(&card_lock, flags);
1018 	list_del(&card->list);
1019 	write_unlock_irqrestore(&card_lock, flags);
1020 	kfree(card);
1021 	AVM_cnt--;
1022 }
1023 
1024 static int
1025 setup_instance(struct fritzcard *card)
1026 {
1027 	int i, err;
1028 	unsigned short minsize;
1029 	u_long flags;
1030 
1031 	snprintf(card->name, MISDN_MAX_IDLEN - 1, "AVM.%d", AVM_cnt + 1);
1032 	write_lock_irqsave(&card_lock, flags);
1033 	list_add_tail(&card->list, &Cards);
1034 	write_unlock_irqrestore(&card_lock, flags);
1035 
1036 	_set_debug(card);
1037 	card->isac.name = card->name;
1038 	spin_lock_init(&card->lock);
1039 	card->isac.hwlock = &card->lock;
1040 	mISDNisac_init(&card->isac, card);
1041 
1042 	card->isac.dch.dev.Bprotocols = (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
1043 		(1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
1044 	card->isac.dch.dev.D.ctrl = avm_dctrl;
1045 	for (i = 0; i < 2; i++) {
1046 		card->bch[i].nr = i + 1;
1047 		set_channelmap(i + 1, card->isac.dch.dev.channelmap);
1048 		if (AVM_FRITZ_PCIV2 == card->type)
1049 			minsize = HDLC_FIFO_SIZE_V2;
1050 		else
1051 			minsize = HDLC_FIFO_SIZE_V1;
1052 		mISDN_initbchannel(&card->bch[i], MAX_DATA_MEM, minsize);
1053 		card->bch[i].hw = card;
1054 		card->bch[i].ch.send = avm_l2l1B;
1055 		card->bch[i].ch.ctrl = avm_bctrl;
1056 		card->bch[i].ch.nr = i + 1;
1057 		list_add(&card->bch[i].ch.list, &card->isac.dch.dev.bchannels);
1058 	}
1059 	err = setup_fritz(card);
1060 	if (err)
1061 		goto error;
1062 	err = mISDN_register_device(&card->isac.dch.dev, &card->pdev->dev,
1063 				    card->name);
1064 	if (err)
1065 		goto error_reg;
1066 	err = init_card(card);
1067 	if (!err)  {
1068 		AVM_cnt++;
1069 		pr_notice("AVM %d cards installed DEBUG\n", AVM_cnt);
1070 		return 0;
1071 	}
1072 	mISDN_unregister_device(&card->isac.dch.dev);
1073 error_reg:
1074 	release_region(card->addr, 32);
1075 error:
1076 	card->isac.release(&card->isac);
1077 	mISDN_freebchannel(&card->bch[1]);
1078 	mISDN_freebchannel(&card->bch[0]);
1079 	write_lock_irqsave(&card_lock, flags);
1080 	list_del(&card->list);
1081 	write_unlock_irqrestore(&card_lock, flags);
1082 	kfree(card);
1083 	return err;
1084 }
1085 
1086 static int
1087 fritzpci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1088 {
1089 	int err = -ENOMEM;
1090 	struct fritzcard *card;
1091 
1092 	card = kzalloc(sizeof(struct fritzcard), GFP_KERNEL);
1093 	if (!card) {
1094 		pr_info("No kmem for fritzcard\n");
1095 		return err;
1096 	}
1097 	if (pdev->device == PCI_DEVICE_ID_AVM_A1_V2)
1098 		card->type = AVM_FRITZ_PCIV2;
1099 	else
1100 		card->type = AVM_FRITZ_PCI;
1101 	card->pdev = pdev;
1102 	err = pci_enable_device(pdev);
1103 	if (err) {
1104 		kfree(card);
1105 		return err;
1106 	}
1107 
1108 	pr_notice("mISDN: found adapter %s at %s\n",
1109 		  (char *) ent->driver_data, pci_name(pdev));
1110 
1111 	card->addr = pci_resource_start(pdev, 1);
1112 	card->irq = pdev->irq;
1113 	pci_set_drvdata(pdev, card);
1114 	err = setup_instance(card);
1115 	if (err)
1116 		pci_set_drvdata(pdev, NULL);
1117 	return err;
1118 }
1119 
1120 static void
1121 fritz_remove_pci(struct pci_dev *pdev)
1122 {
1123 	struct fritzcard *card = pci_get_drvdata(pdev);
1124 
1125 	if (card)
1126 		release_card(card);
1127 	else
1128 		if (debug)
1129 			pr_info("%s: drvdata already removed\n", __func__);
1130 }
1131 
1132 static const struct pci_device_id fcpci_ids[] = {
1133 	{ PCI_VENDOR_ID_AVM, PCI_DEVICE_ID_AVM_A1, PCI_ANY_ID, PCI_ANY_ID,
1134 	  0, 0, (unsigned long) "Fritz!Card PCI"},
1135 	{ PCI_VENDOR_ID_AVM, PCI_DEVICE_ID_AVM_A1_V2, PCI_ANY_ID, PCI_ANY_ID,
1136 	  0, 0, (unsigned long) "Fritz!Card PCI v2" },
1137 	{ }
1138 };
1139 MODULE_DEVICE_TABLE(pci, fcpci_ids);
1140 
1141 static struct pci_driver fcpci_driver = {
1142 	.name = "fcpci",
1143 	.probe = fritzpci_probe,
1144 	.remove = fritz_remove_pci,
1145 	.id_table = fcpci_ids,
1146 };
1147 
1148 static int __init AVM_init(void)
1149 {
1150 	int err;
1151 
1152 	pr_notice("AVM Fritz PCI driver Rev. %s\n", AVMFRITZ_REV);
1153 	err = pci_register_driver(&fcpci_driver);
1154 	return err;
1155 }
1156 
1157 static void __exit AVM_cleanup(void)
1158 {
1159 	pci_unregister_driver(&fcpci_driver);
1160 }
1161 
1162 module_init(AVM_init);
1163 module_exit(AVM_cleanup);
1164