1 /*
2  * speedfax.c	low level stuff for Sedlbauer Speedfax+ cards
3  *		based on the ISAR DSP
4  *		Thanks to Sedlbauer AG for informations and HW
5  *
6  * Author       Karsten Keil <keil@isdn4linux.de>
7  *
8  * Copyright 2009  by Karsten Keil <keil@isdn4linux.de>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
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  */
24 
25 #include <linux/interrupt.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/pci.h>
29 #include <linux/delay.h>
30 #include <linux/mISDNhw.h>
31 #include <linux/firmware.h>
32 #include "ipac.h"
33 #include "isar.h"
34 
35 #define SPEEDFAX_REV	"2.0"
36 
37 #define PCI_SUBVENDOR_SPEEDFAX_PYRAMID	0x51
38 #define PCI_SUBVENDOR_SPEEDFAX_PCI	0x54
39 #define PCI_SUB_ID_SEDLBAUER		0x01
40 
41 #define SFAX_PCI_ADDR		0xc8
42 #define SFAX_PCI_ISAC		0xd0
43 #define SFAX_PCI_ISAR		0xe0
44 
45 /* TIGER 100 Registers */
46 
47 #define TIGER_RESET_ADDR	0x00
48 #define TIGER_EXTERN_RESET_ON	0x01
49 #define TIGER_EXTERN_RESET_OFF	0x00
50 #define TIGER_AUX_CTRL		0x02
51 #define TIGER_AUX_DATA		0x03
52 #define TIGER_AUX_IRQMASK	0x05
53 #define TIGER_AUX_STATUS	0x07
54 
55 /* Tiger AUX BITs */
56 #define SFAX_AUX_IOMASK		0xdd	/* 1 and 5 are inputs */
57 #define SFAX_ISAR_RESET_BIT_OFF 0x00
58 #define SFAX_ISAR_RESET_BIT_ON	0x01
59 #define SFAX_TIGER_IRQ_BIT	0x02
60 #define SFAX_LED1_BIT		0x08
61 #define SFAX_LED2_BIT		0x10
62 
63 #define SFAX_PCI_RESET_ON	(SFAX_ISAR_RESET_BIT_ON)
64 #define SFAX_PCI_RESET_OFF	(SFAX_LED1_BIT | SFAX_LED2_BIT)
65 
66 static int sfax_cnt;
67 static u32 debug;
68 static u32 irqloops = 4;
69 
70 struct sfax_hw {
71 	struct list_head	list;
72 	struct pci_dev		*pdev;
73 	char			name[MISDN_MAX_IDLEN];
74 	u32			irq;
75 	u32			irqcnt;
76 	u32			cfg;
77 	struct _ioport		p_isac;
78 	struct _ioport		p_isar;
79 	u8			aux_data;
80 	spinlock_t		lock;	/* HW access lock */
81 	struct isac_hw		isac;
82 	struct isar_hw		isar;
83 };
84 
85 static LIST_HEAD(Cards);
86 static DEFINE_RWLOCK(card_lock); /* protect Cards */
87 
88 static void
89 _set_debug(struct sfax_hw *card)
90 {
91 	card->isac.dch.debug = debug;
92 	card->isar.ch[0].bch.debug = debug;
93 	card->isar.ch[1].bch.debug = debug;
94 }
95 
96 static int
97 set_debug(const char *val, struct kernel_param *kp)
98 {
99 	int ret;
100 	struct sfax_hw *card;
101 
102 	ret = param_set_uint(val, kp);
103 	if (!ret) {
104 		read_lock(&card_lock);
105 		list_for_each_entry(card, &Cards, list)
106 			_set_debug(card);
107 		read_unlock(&card_lock);
108 	}
109 	return ret;
110 }
111 
112 MODULE_AUTHOR("Karsten Keil");
113 MODULE_LICENSE("GPL v2");
114 MODULE_VERSION(SPEEDFAX_REV);
115 MODULE_FIRMWARE("isdn/ISAR.BIN");
116 module_param_call(debug, set_debug, param_get_uint, &debug, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(debug, "Speedfax debug mask");
118 module_param(irqloops, uint, S_IRUGO | S_IWUSR);
119 MODULE_PARM_DESC(irqloops, "Speedfax maximal irqloops (default 4)");
120 
121 IOFUNC_IND(ISAC, sfax_hw, p_isac)
122 IOFUNC_IND(ISAR, sfax_hw, p_isar)
123 
124 static irqreturn_t
125 speedfax_irq(int intno, void *dev_id)
126 {
127 	struct sfax_hw	*sf = dev_id;
128 	u8 val;
129 	int cnt = irqloops;
130 
131 	spin_lock(&sf->lock);
132 	val = inb(sf->cfg + TIGER_AUX_STATUS);
133 	if (val & SFAX_TIGER_IRQ_BIT) { /* for us or shared ? */
134 		spin_unlock(&sf->lock);
135 		return IRQ_NONE; /* shared */
136 	}
137 	sf->irqcnt++;
138 	val = ReadISAR_IND(sf, ISAR_IRQBIT);
139 Start_ISAR:
140 	if (val & ISAR_IRQSTA)
141 		mISDNisar_irq(&sf->isar);
142 	val = ReadISAC_IND(sf, ISAC_ISTA);
143 	if (val)
144 		mISDNisac_irq(&sf->isac, val);
145 	val = ReadISAR_IND(sf, ISAR_IRQBIT);
146 	if ((val & ISAR_IRQSTA) && cnt--)
147 		goto Start_ISAR;
148 	if (cnt < irqloops)
149 		pr_debug("%s: %d irqloops cpu%d\n", sf->name,
150 			 irqloops - cnt, smp_processor_id());
151 	if (irqloops && !cnt)
152 		pr_notice("%s: %d IRQ LOOP cpu%d\n", sf->name,
153 			  irqloops, smp_processor_id());
154 	spin_unlock(&sf->lock);
155 	return IRQ_HANDLED;
156 }
157 
158 static void
159 enable_hwirq(struct sfax_hw *sf)
160 {
161 	WriteISAC_IND(sf, ISAC_MASK, 0);
162 	WriteISAR_IND(sf, ISAR_IRQBIT, ISAR_IRQMSK);
163 	outb(SFAX_TIGER_IRQ_BIT, sf->cfg + TIGER_AUX_IRQMASK);
164 }
165 
166 static void
167 disable_hwirq(struct sfax_hw *sf)
168 {
169 	WriteISAC_IND(sf, ISAC_MASK, 0xFF);
170 	WriteISAR_IND(sf, ISAR_IRQBIT, 0);
171 	outb(0, sf->cfg + TIGER_AUX_IRQMASK);
172 }
173 
174 static void
175 reset_speedfax(struct sfax_hw *sf)
176 {
177 
178 	pr_debug("%s: resetting card\n", sf->name);
179 	outb(TIGER_EXTERN_RESET_ON, sf->cfg + TIGER_RESET_ADDR);
180 	outb(SFAX_PCI_RESET_ON, sf->cfg + TIGER_AUX_DATA);
181 	mdelay(1);
182 	outb(TIGER_EXTERN_RESET_OFF, sf->cfg + TIGER_RESET_ADDR);
183 	sf->aux_data = SFAX_PCI_RESET_OFF;
184 	outb(sf->aux_data, sf->cfg + TIGER_AUX_DATA);
185 	mdelay(1);
186 }
187 
188 static int
189 sfax_ctrl(struct sfax_hw  *sf, u32 cmd, u_long arg)
190 {
191 	int ret = 0;
192 
193 	switch (cmd) {
194 	case HW_RESET_REQ:
195 		reset_speedfax(sf);
196 		break;
197 	case HW_ACTIVATE_IND:
198 		if (arg & 1)
199 			sf->aux_data &= ~SFAX_LED1_BIT;
200 		if (arg & 2)
201 			sf->aux_data &= ~SFAX_LED2_BIT;
202 		outb(sf->aux_data, sf->cfg + TIGER_AUX_DATA);
203 		break;
204 	case HW_DEACT_IND:
205 		if (arg & 1)
206 			sf->aux_data |= SFAX_LED1_BIT;
207 		if (arg & 2)
208 			sf->aux_data |= SFAX_LED2_BIT;
209 		outb(sf->aux_data, sf->cfg + TIGER_AUX_DATA);
210 		break;
211 	default:
212 		pr_info("%s: %s unknown command %x %lx\n",
213 			sf->name, __func__, cmd, arg);
214 		ret = -EINVAL;
215 		break;
216 	}
217 	return ret;
218 }
219 
220 static int
221 channel_ctrl(struct sfax_hw  *sf, struct mISDN_ctrl_req *cq)
222 {
223 	int	ret = 0;
224 
225 	switch (cq->op) {
226 	case MISDN_CTRL_GETOP:
227 		cq->op = MISDN_CTRL_LOOP | MISDN_CTRL_L1_TIMER3;
228 		break;
229 	case MISDN_CTRL_LOOP:
230 		/* cq->channel: 0 disable, 1 B1 loop 2 B2 loop, 3 both */
231 		if (cq->channel < 0 || cq->channel > 3) {
232 			ret = -EINVAL;
233 			break;
234 		}
235 		ret = sf->isac.ctrl(&sf->isac, HW_TESTLOOP, cq->channel);
236 		break;
237 	case MISDN_CTRL_L1_TIMER3:
238 		ret = sf->isac.ctrl(&sf->isac, HW_TIMER3_VALUE, cq->p1);
239 		break;
240 	default:
241 		pr_info("%s: unknown Op %x\n", sf->name, cq->op);
242 		ret = -EINVAL;
243 		break;
244 	}
245 	return ret;
246 }
247 
248 static int
249 sfax_dctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
250 {
251 	struct mISDNdevice	*dev = container_of(ch, struct mISDNdevice, D);
252 	struct dchannel		*dch = container_of(dev, struct dchannel, dev);
253 	struct sfax_hw		*sf = dch->hw;
254 	struct channel_req	*rq;
255 	int			err = 0;
256 
257 	pr_debug("%s: cmd:%x %p\n", sf->name, cmd, arg);
258 	switch (cmd) {
259 	case OPEN_CHANNEL:
260 		rq = arg;
261 		if (rq->protocol == ISDN_P_TE_S0)
262 			err = sf->isac.open(&sf->isac, rq);
263 		else
264 			err = sf->isar.open(&sf->isar, rq);
265 		if (err)
266 			break;
267 		if (!try_module_get(THIS_MODULE))
268 			pr_info("%s: cannot get module\n", sf->name);
269 		break;
270 	case CLOSE_CHANNEL:
271 		pr_debug("%s: dev(%d) close from %p\n", sf->name,
272 			 dch->dev.id, __builtin_return_address(0));
273 		module_put(THIS_MODULE);
274 		break;
275 	case CONTROL_CHANNEL:
276 		err = channel_ctrl(sf, arg);
277 		break;
278 	default:
279 		pr_debug("%s: unknown command %x\n", sf->name, cmd);
280 		return -EINVAL;
281 	}
282 	return err;
283 }
284 
285 static int
286 init_card(struct sfax_hw *sf)
287 {
288 	int	ret, cnt = 3;
289 	u_long	flags;
290 
291 	ret = request_irq(sf->irq, speedfax_irq, IRQF_SHARED, sf->name, sf);
292 	if (ret) {
293 		pr_info("%s: couldn't get interrupt %d\n", sf->name, sf->irq);
294 		return ret;
295 	}
296 	while (cnt--) {
297 		spin_lock_irqsave(&sf->lock, flags);
298 		ret = sf->isac.init(&sf->isac);
299 		if (ret) {
300 			spin_unlock_irqrestore(&sf->lock, flags);
301 			pr_info("%s: ISAC init failed with %d\n",
302 				sf->name, ret);
303 			break;
304 		}
305 		enable_hwirq(sf);
306 		/* RESET Receiver and Transmitter */
307 		WriteISAC_IND(sf, ISAC_CMDR, 0x41);
308 		spin_unlock_irqrestore(&sf->lock, flags);
309 		msleep_interruptible(10);
310 		if (debug & DEBUG_HW)
311 			pr_notice("%s: IRQ %d count %d\n", sf->name,
312 				  sf->irq, sf->irqcnt);
313 		if (!sf->irqcnt) {
314 			pr_info("%s: IRQ(%d) got no requests during init %d\n",
315 				sf->name, sf->irq, 3 - cnt);
316 		} else
317 			return 0;
318 	}
319 	free_irq(sf->irq, sf);
320 	return -EIO;
321 }
322 
323 
324 static int
325 setup_speedfax(struct sfax_hw *sf)
326 {
327 	u_long flags;
328 
329 	if (!request_region(sf->cfg, 256, sf->name)) {
330 		pr_info("mISDN: %s config port %x-%x already in use\n",
331 			sf->name, sf->cfg, sf->cfg + 255);
332 		return -EIO;
333 	}
334 	outb(0xff, sf->cfg);
335 	outb(0, sf->cfg);
336 	outb(0xdd, sf->cfg + TIGER_AUX_CTRL);
337 	outb(0, sf->cfg + TIGER_AUX_IRQMASK);
338 
339 	sf->isac.type = IPAC_TYPE_ISAC;
340 	sf->p_isac.ale = sf->cfg + SFAX_PCI_ADDR;
341 	sf->p_isac.port = sf->cfg + SFAX_PCI_ISAC;
342 	sf->p_isar.ale = sf->cfg + SFAX_PCI_ADDR;
343 	sf->p_isar.port = sf->cfg + SFAX_PCI_ISAR;
344 	ASSIGN_FUNC(IND, ISAC, sf->isac);
345 	ASSIGN_FUNC(IND, ISAR, sf->isar);
346 	spin_lock_irqsave(&sf->lock, flags);
347 	reset_speedfax(sf);
348 	disable_hwirq(sf);
349 	spin_unlock_irqrestore(&sf->lock, flags);
350 	return 0;
351 }
352 
353 static void
354 release_card(struct sfax_hw *card) {
355 	u_long	flags;
356 
357 	spin_lock_irqsave(&card->lock, flags);
358 	disable_hwirq(card);
359 	spin_unlock_irqrestore(&card->lock, flags);
360 	card->isac.release(&card->isac);
361 	free_irq(card->irq, card);
362 	card->isar.release(&card->isar);
363 	mISDN_unregister_device(&card->isac.dch.dev);
364 	release_region(card->cfg, 256);
365 	pci_disable_device(card->pdev);
366 	pci_set_drvdata(card->pdev, NULL);
367 	write_lock_irqsave(&card_lock, flags);
368 	list_del(&card->list);
369 	write_unlock_irqrestore(&card_lock, flags);
370 	kfree(card);
371 	sfax_cnt--;
372 }
373 
374 static int
375 setup_instance(struct sfax_hw *card)
376 {
377 	const struct firmware *firmware;
378 	int i, err;
379 	u_long flags;
380 
381 	snprintf(card->name, MISDN_MAX_IDLEN - 1, "Speedfax.%d", sfax_cnt + 1);
382 	write_lock_irqsave(&card_lock, flags);
383 	list_add_tail(&card->list, &Cards);
384 	write_unlock_irqrestore(&card_lock, flags);
385 	_set_debug(card);
386 	spin_lock_init(&card->lock);
387 	card->isac.hwlock = &card->lock;
388 	card->isar.hwlock = &card->lock;
389 	card->isar.ctrl = (void *)&sfax_ctrl;
390 	card->isac.name = card->name;
391 	card->isar.name = card->name;
392 	card->isar.owner = THIS_MODULE;
393 
394 	err = request_firmware(&firmware, "isdn/ISAR.BIN", &card->pdev->dev);
395 	if (err < 0) {
396 		pr_info("%s: firmware request failed %d\n",
397 			card->name, err);
398 		goto error_fw;
399 	}
400 	if (debug & DEBUG_HW)
401 		pr_notice("%s: got firmware %zu bytes\n",
402 			  card->name, firmware->size);
403 
404 	mISDNisac_init(&card->isac, card);
405 
406 	card->isac.dch.dev.D.ctrl = sfax_dctrl;
407 	card->isac.dch.dev.Bprotocols =
408 		mISDNisar_init(&card->isar, card);
409 	for (i = 0; i < 2; i++) {
410 		set_channelmap(i + 1, card->isac.dch.dev.channelmap);
411 		list_add(&card->isar.ch[i].bch.ch.list,
412 			 &card->isac.dch.dev.bchannels);
413 	}
414 
415 	err = setup_speedfax(card);
416 	if (err)
417 		goto error_setup;
418 	err = card->isar.init(&card->isar);
419 	if (err)
420 		goto error;
421 	err = mISDN_register_device(&card->isac.dch.dev,
422 				    &card->pdev->dev, card->name);
423 	if (err)
424 		goto error;
425 	err = init_card(card);
426 	if (err)
427 		goto error_init;
428 	err = card->isar.firmware(&card->isar, firmware->data, firmware->size);
429 	if (!err)  {
430 		release_firmware(firmware);
431 		sfax_cnt++;
432 		pr_notice("SpeedFax %d cards installed\n", sfax_cnt);
433 		return 0;
434 	}
435 	disable_hwirq(card);
436 	free_irq(card->irq, card);
437 error_init:
438 	mISDN_unregister_device(&card->isac.dch.dev);
439 error:
440 	release_region(card->cfg, 256);
441 error_setup:
442 	card->isac.release(&card->isac);
443 	card->isar.release(&card->isar);
444 	release_firmware(firmware);
445 error_fw:
446 	pci_disable_device(card->pdev);
447 	write_lock_irqsave(&card_lock, flags);
448 	list_del(&card->list);
449 	write_unlock_irqrestore(&card_lock, flags);
450 	kfree(card);
451 	return err;
452 }
453 
454 static int
455 sfaxpci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
456 {
457 	int err = -ENOMEM;
458 	struct sfax_hw *card = kzalloc(sizeof(struct sfax_hw), GFP_KERNEL);
459 
460 	if (!card) {
461 		pr_info("No memory for Speedfax+ PCI\n");
462 		return err;
463 	}
464 	card->pdev = pdev;
465 	err = pci_enable_device(pdev);
466 	if (err) {
467 		kfree(card);
468 		return err;
469 	}
470 
471 	pr_notice("mISDN: Speedfax found adapter %s at %s\n",
472 		  (char *)ent->driver_data, pci_name(pdev));
473 
474 	card->cfg = pci_resource_start(pdev, 0);
475 	card->irq = pdev->irq;
476 	pci_set_drvdata(pdev, card);
477 	err = setup_instance(card);
478 	if (err)
479 		pci_set_drvdata(pdev, NULL);
480 	return err;
481 }
482 
483 static void
484 sfax_remove_pci(struct pci_dev *pdev)
485 {
486 	struct sfax_hw	*card = pci_get_drvdata(pdev);
487 
488 	if (card)
489 		release_card(card);
490 	else
491 		pr_debug("%s: drvdata already removed\n", __func__);
492 }
493 
494 static struct pci_device_id sfaxpci_ids[] = {
495 	{ PCI_VENDOR_ID_TIGERJET, PCI_DEVICE_ID_TIGERJET_100,
496 	  PCI_SUBVENDOR_SPEEDFAX_PYRAMID, PCI_SUB_ID_SEDLBAUER,
497 	  0, 0, (unsigned long) "Pyramid Speedfax + PCI"
498 	},
499 	{ PCI_VENDOR_ID_TIGERJET, PCI_DEVICE_ID_TIGERJET_100,
500 	  PCI_SUBVENDOR_SPEEDFAX_PCI, PCI_SUB_ID_SEDLBAUER,
501 	  0, 0, (unsigned long) "Sedlbauer Speedfax + PCI"
502 	},
503 	{ }
504 };
505 MODULE_DEVICE_TABLE(pci, sfaxpci_ids);
506 
507 static struct pci_driver sfaxpci_driver = {
508 	.name = "speedfax+ pci",
509 	.probe = sfaxpci_probe,
510 	.remove = sfax_remove_pci,
511 	.id_table = sfaxpci_ids,
512 };
513 
514 static int __init
515 Speedfax_init(void)
516 {
517 	int err;
518 
519 	pr_notice("Sedlbauer Speedfax+ Driver Rev. %s\n",
520 		  SPEEDFAX_REV);
521 	err = pci_register_driver(&sfaxpci_driver);
522 	return err;
523 }
524 
525 static void __exit
526 Speedfax_cleanup(void)
527 {
528 	pci_unregister_driver(&sfaxpci_driver);
529 }
530 
531 module_init(Speedfax_init);
532 module_exit(Speedfax_cleanup);
533