xref: /openbmc/linux/drivers/tty/nozomi.c (revision 6774def6)
1 /*
2  * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
3  *
4  * Written by: Ulf Jakobsson,
5  *             Jan Åkerfeldt,
6  *             Stefan Thomasson,
7  *
8  * Maintained by: Paul Hardwick (p.hardwick@option.com)
9  *
10  * Patches:
11  *          Locking code changes for Vodafone by Sphere Systems Ltd,
12  *                              Andrew Bird (ajb@spheresystems.co.uk )
13  *                              & Phil Sanderson
14  *
15  * Source has been ported from an implementation made by Filip Aben @ Option
16  *
17  * --------------------------------------------------------------------------
18  *
19  * Copyright (c) 2005,2006 Option Wireless Sweden AB
20  * Copyright (c) 2006 Sphere Systems Ltd
21  * Copyright (c) 2006 Option Wireless n/v
22  * All rights Reserved.
23  *
24  * This program is free software; you can redistribute it and/or modify
25  * it under the terms of the GNU General Public License as published by
26  * the Free Software Foundation; either version 2 of the License, or
27  * (at your option) any later version.
28  *
29  * This program is distributed in the hope that it will be useful,
30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
32  * GNU General Public License for more details.
33  *
34  * You should have received a copy of the GNU General Public License
35  * along with this program; if not, write to the Free Software
36  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
37  *
38  * --------------------------------------------------------------------------
39  */
40 
41 /* Enable this to have a lot of debug printouts */
42 #define DEBUG
43 
44 #include <linux/kernel.h>
45 #include <linux/module.h>
46 #include <linux/pci.h>
47 #include <linux/ioport.h>
48 #include <linux/tty.h>
49 #include <linux/tty_driver.h>
50 #include <linux/tty_flip.h>
51 #include <linux/sched.h>
52 #include <linux/serial.h>
53 #include <linux/interrupt.h>
54 #include <linux/kmod.h>
55 #include <linux/init.h>
56 #include <linux/kfifo.h>
57 #include <linux/uaccess.h>
58 #include <linux/slab.h>
59 #include <asm/byteorder.h>
60 
61 #include <linux/delay.h>
62 
63 
64 #define VERSION_STRING DRIVER_DESC " 2.1d"
65 
66 /*    Macros definitions */
67 
68 /* Default debug printout level */
69 #define NOZOMI_DEBUG_LEVEL 0x00
70 
71 #define P_BUF_SIZE 128
72 #define NFO(_err_flag_, args...)				\
73 do {								\
74 	char tmp[P_BUF_SIZE];					\
75 	snprintf(tmp, sizeof(tmp), ##args);			\
76 	printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,		\
77 		__func__, tmp);				\
78 } while (0)
79 
80 #define DBG1(args...) D_(0x01, ##args)
81 #define DBG2(args...) D_(0x02, ##args)
82 #define DBG3(args...) D_(0x04, ##args)
83 #define DBG4(args...) D_(0x08, ##args)
84 #define DBG5(args...) D_(0x10, ##args)
85 #define DBG6(args...) D_(0x20, ##args)
86 #define DBG7(args...) D_(0x40, ##args)
87 #define DBG8(args...) D_(0x80, ##args)
88 
89 #ifdef DEBUG
90 /* Do we need this settable at runtime? */
91 static int debug = NOZOMI_DEBUG_LEVEL;
92 
93 #define D(lvl, args...)  do \
94 			{if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
95 			while (0)
96 #define D_(lvl, args...) D(lvl, ##args)
97 
98 /* These printouts are always printed */
99 
100 #else
101 static int debug;
102 #define D_(lvl, args...)
103 #endif
104 
105 /* TODO: rewrite to optimize macros... */
106 
107 #define TMP_BUF_MAX 256
108 
109 #define DUMP(buf__,len__) \
110   do {  \
111     char tbuf[TMP_BUF_MAX] = {0};\
112     if (len__ > 1) {\
113 	snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
114 	if (tbuf[len__-2] == '\r') {\
115 		tbuf[len__-2] = 'r';\
116 	} \
117 	DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
118     } else {\
119 	DBG1("SENDING: '%s' (%d)", tbuf, len__);\
120     } \
121 } while (0)
122 
123 /*    Defines */
124 #define NOZOMI_NAME		"nozomi"
125 #define NOZOMI_NAME_TTY		"nozomi_tty"
126 #define DRIVER_DESC		"Nozomi driver"
127 
128 #define NTTY_TTY_MAXMINORS	256
129 #define NTTY_FIFO_BUFFER_SIZE	8192
130 
131 /* Must be power of 2 */
132 #define FIFO_BUFFER_SIZE_UL	8192
133 
134 /* Size of tmp send buffer to card */
135 #define SEND_BUF_MAX		1024
136 #define RECEIVE_BUF_MAX		4
137 
138 
139 #define R_IIR		0x0000	/* Interrupt Identity Register */
140 #define R_FCR		0x0000	/* Flow Control Register */
141 #define R_IER		0x0004	/* Interrupt Enable Register */
142 
143 #define CONFIG_MAGIC	0xEFEFFEFE
144 #define TOGGLE_VALID	0x0000
145 
146 /* Definition of interrupt tokens */
147 #define MDM_DL1		0x0001
148 #define MDM_UL1		0x0002
149 #define MDM_DL2		0x0004
150 #define MDM_UL2		0x0008
151 #define DIAG_DL1	0x0010
152 #define DIAG_DL2	0x0020
153 #define DIAG_UL		0x0040
154 #define APP1_DL		0x0080
155 #define APP1_UL		0x0100
156 #define APP2_DL		0x0200
157 #define APP2_UL		0x0400
158 #define CTRL_DL		0x0800
159 #define CTRL_UL		0x1000
160 #define RESET		0x8000
161 
162 #define MDM_DL		(MDM_DL1  | MDM_DL2)
163 #define MDM_UL		(MDM_UL1  | MDM_UL2)
164 #define DIAG_DL		(DIAG_DL1 | DIAG_DL2)
165 
166 /* modem signal definition */
167 #define CTRL_DSR	0x0001
168 #define CTRL_DCD	0x0002
169 #define CTRL_RI		0x0004
170 #define CTRL_CTS	0x0008
171 
172 #define CTRL_DTR	0x0001
173 #define CTRL_RTS	0x0002
174 
175 #define MAX_PORT		4
176 #define NOZOMI_MAX_PORTS	5
177 #define NOZOMI_MAX_CARDS	(NTTY_TTY_MAXMINORS / MAX_PORT)
178 
179 /*    Type definitions */
180 
181 /*
182  * There are two types of nozomi cards,
183  * one with 2048 memory and with 8192 memory
184  */
185 enum card_type {
186 	F32_2 = 2048,	/* 512 bytes downlink + uplink * 2 -> 2048 */
187 	F32_8 = 8192,	/* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
188 };
189 
190 /* Initialization states a card can be in */
191 enum card_state {
192 	NOZOMI_STATE_UKNOWN	= 0,
193 	NOZOMI_STATE_ENABLED	= 1,	/* pci device enabled */
194 	NOZOMI_STATE_ALLOCATED	= 2,	/* config setup done */
195 	NOZOMI_STATE_READY	= 3,	/* flowcontrols received */
196 };
197 
198 /* Two different toggle channels exist */
199 enum channel_type {
200 	CH_A = 0,
201 	CH_B = 1,
202 };
203 
204 /* Port definition for the card regarding flow control */
205 enum ctrl_port_type {
206 	CTRL_CMD	= 0,
207 	CTRL_MDM	= 1,
208 	CTRL_DIAG	= 2,
209 	CTRL_APP1	= 3,
210 	CTRL_APP2	= 4,
211 	CTRL_ERROR	= -1,
212 };
213 
214 /* Ports that the nozomi has */
215 enum port_type {
216 	PORT_MDM	= 0,
217 	PORT_DIAG	= 1,
218 	PORT_APP1	= 2,
219 	PORT_APP2	= 3,
220 	PORT_CTRL	= 4,
221 	PORT_ERROR	= -1,
222 };
223 
224 #ifdef __BIG_ENDIAN
225 /* Big endian */
226 
227 struct toggles {
228 	unsigned int enabled:5;	/*
229 				 * Toggle fields are valid if enabled is 0,
230 				 * else A-channels must always be used.
231 				 */
232 	unsigned int diag_dl:1;
233 	unsigned int mdm_dl:1;
234 	unsigned int mdm_ul:1;
235 } __attribute__ ((packed));
236 
237 /* Configuration table to read at startup of card */
238 /* Is for now only needed during initialization phase */
239 struct config_table {
240 	u32 signature;
241 	u16 product_information;
242 	u16 version;
243 	u8 pad3[3];
244 	struct toggles toggle;
245 	u8 pad1[4];
246 	u16 dl_mdm_len1;	/*
247 				 * If this is 64, it can hold
248 				 * 60 bytes + 4 that is length field
249 				 */
250 	u16 dl_start;
251 
252 	u16 dl_diag_len1;
253 	u16 dl_mdm_len2;	/*
254 				 * If this is 64, it can hold
255 				 * 60 bytes + 4 that is length field
256 				 */
257 	u16 dl_app1_len;
258 
259 	u16 dl_diag_len2;
260 	u16 dl_ctrl_len;
261 	u16 dl_app2_len;
262 	u8 pad2[16];
263 	u16 ul_mdm_len1;
264 	u16 ul_start;
265 	u16 ul_diag_len;
266 	u16 ul_mdm_len2;
267 	u16 ul_app1_len;
268 	u16 ul_app2_len;
269 	u16 ul_ctrl_len;
270 } __attribute__ ((packed));
271 
272 /* This stores all control downlink flags */
273 struct ctrl_dl {
274 	u8 port;
275 	unsigned int reserved:4;
276 	unsigned int CTS:1;
277 	unsigned int RI:1;
278 	unsigned int DCD:1;
279 	unsigned int DSR:1;
280 } __attribute__ ((packed));
281 
282 /* This stores all control uplink flags */
283 struct ctrl_ul {
284 	u8 port;
285 	unsigned int reserved:6;
286 	unsigned int RTS:1;
287 	unsigned int DTR:1;
288 } __attribute__ ((packed));
289 
290 #else
291 /* Little endian */
292 
293 /* This represents the toggle information */
294 struct toggles {
295 	unsigned int mdm_ul:1;
296 	unsigned int mdm_dl:1;
297 	unsigned int diag_dl:1;
298 	unsigned int enabled:5;	/*
299 				 * Toggle fields are valid if enabled is 0,
300 				 * else A-channels must always be used.
301 				 */
302 } __attribute__ ((packed));
303 
304 /* Configuration table to read at startup of card */
305 struct config_table {
306 	u32 signature;
307 	u16 version;
308 	u16 product_information;
309 	struct toggles toggle;
310 	u8 pad1[7];
311 	u16 dl_start;
312 	u16 dl_mdm_len1;	/*
313 				 * If this is 64, it can hold
314 				 * 60 bytes + 4 that is length field
315 				 */
316 	u16 dl_mdm_len2;
317 	u16 dl_diag_len1;
318 	u16 dl_diag_len2;
319 	u16 dl_app1_len;
320 	u16 dl_app2_len;
321 	u16 dl_ctrl_len;
322 	u8 pad2[16];
323 	u16 ul_start;
324 	u16 ul_mdm_len2;
325 	u16 ul_mdm_len1;
326 	u16 ul_diag_len;
327 	u16 ul_app1_len;
328 	u16 ul_app2_len;
329 	u16 ul_ctrl_len;
330 } __attribute__ ((packed));
331 
332 /* This stores all control downlink flags */
333 struct ctrl_dl {
334 	unsigned int DSR:1;
335 	unsigned int DCD:1;
336 	unsigned int RI:1;
337 	unsigned int CTS:1;
338 	unsigned int reserverd:4;
339 	u8 port;
340 } __attribute__ ((packed));
341 
342 /* This stores all control uplink flags */
343 struct ctrl_ul {
344 	unsigned int DTR:1;
345 	unsigned int RTS:1;
346 	unsigned int reserved:6;
347 	u8 port;
348 } __attribute__ ((packed));
349 #endif
350 
351 /* This holds all information that is needed regarding a port */
352 struct port {
353 	struct tty_port port;
354 	u8 update_flow_control;
355 	struct ctrl_ul ctrl_ul;
356 	struct ctrl_dl ctrl_dl;
357 	struct kfifo fifo_ul;
358 	void __iomem *dl_addr[2];
359 	u32 dl_size[2];
360 	u8 toggle_dl;
361 	void __iomem *ul_addr[2];
362 	u32 ul_size[2];
363 	u8 toggle_ul;
364 	u16 token_dl;
365 
366 	wait_queue_head_t tty_wait;
367 	struct async_icount tty_icount;
368 
369 	struct nozomi *dc;
370 };
371 
372 /* Private data one for each card in the system */
373 struct nozomi {
374 	void __iomem *base_addr;
375 	unsigned long flip;
376 
377 	/* Pointers to registers */
378 	void __iomem *reg_iir;
379 	void __iomem *reg_fcr;
380 	void __iomem *reg_ier;
381 
382 	u16 last_ier;
383 	enum card_type card_type;
384 	struct config_table config_table;	/* Configuration table */
385 	struct pci_dev *pdev;
386 	struct port port[NOZOMI_MAX_PORTS];
387 	u8 *send_buf;
388 
389 	spinlock_t spin_mutex;	/* secures access to registers and tty */
390 
391 	unsigned int index_start;
392 	enum card_state state;
393 	u32 open_ttys;
394 };
395 
396 /* This is a data packet that is read or written to/from card */
397 struct buffer {
398 	u32 size;		/* size is the length of the data buffer */
399 	u8 *data;
400 } __attribute__ ((packed));
401 
402 /*    Global variables */
403 static const struct pci_device_id nozomi_pci_tbl[] = {
404 	{PCI_DEVICE(0x1931, 0x000c)},	/* Nozomi HSDPA */
405 	{},
406 };
407 
408 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
409 
410 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
411 static struct tty_driver *ntty_driver;
412 
413 static const struct tty_port_operations noz_tty_port_ops;
414 
415 /*
416  * find card by tty_index
417  */
418 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
419 {
420 	return tty ? ndevs[tty->index / MAX_PORT] : NULL;
421 }
422 
423 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
424 {
425 	struct nozomi *ndev = get_dc_by_tty(tty);
426 	return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
427 }
428 
429 /*
430  * TODO:
431  * -Optimize
432  * -Rewrite cleaner
433  */
434 
435 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
436 			u32 size_bytes)
437 {
438 	u32 i = 0;
439 	const u32 __iomem *ptr = mem_addr_start;
440 	u16 *buf16;
441 
442 	if (unlikely(!ptr || !buf))
443 		goto out;
444 
445 	/* shortcut for extremely often used cases */
446 	switch (size_bytes) {
447 	case 2:	/* 2 bytes */
448 		buf16 = (u16 *) buf;
449 		*buf16 = __le16_to_cpu(readw(ptr));
450 		goto out;
451 		break;
452 	case 4:	/* 4 bytes */
453 		*(buf) = __le32_to_cpu(readl(ptr));
454 		goto out;
455 		break;
456 	}
457 
458 	while (i < size_bytes) {
459 		if (size_bytes - i == 2) {
460 			/* Handle 2 bytes in the end */
461 			buf16 = (u16 *) buf;
462 			*(buf16) = __le16_to_cpu(readw(ptr));
463 			i += 2;
464 		} else {
465 			/* Read 4 bytes */
466 			*(buf) = __le32_to_cpu(readl(ptr));
467 			i += 4;
468 		}
469 		buf++;
470 		ptr++;
471 	}
472 out:
473 	return;
474 }
475 
476 /*
477  * TODO:
478  * -Optimize
479  * -Rewrite cleaner
480  */
481 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
482 			u32 size_bytes)
483 {
484 	u32 i = 0;
485 	u32 __iomem *ptr = mem_addr_start;
486 	const u16 *buf16;
487 
488 	if (unlikely(!ptr || !buf))
489 		return 0;
490 
491 	/* shortcut for extremely often used cases */
492 	switch (size_bytes) {
493 	case 2:	/* 2 bytes */
494 		buf16 = (const u16 *)buf;
495 		writew(__cpu_to_le16(*buf16), ptr);
496 		return 2;
497 		break;
498 	case 1: /*
499 		 * also needs to write 4 bytes in this case
500 		 * so falling through..
501 		 */
502 	case 4: /* 4 bytes */
503 		writel(__cpu_to_le32(*buf), ptr);
504 		return 4;
505 		break;
506 	}
507 
508 	while (i < size_bytes) {
509 		if (size_bytes - i == 2) {
510 			/* 2 bytes */
511 			buf16 = (const u16 *)buf;
512 			writew(__cpu_to_le16(*buf16), ptr);
513 			i += 2;
514 		} else {
515 			/* 4 bytes */
516 			writel(__cpu_to_le32(*buf), ptr);
517 			i += 4;
518 		}
519 		buf++;
520 		ptr++;
521 	}
522 	return i;
523 }
524 
525 /* Setup pointers to different channels and also setup buffer sizes. */
526 static void nozomi_setup_memory(struct nozomi *dc)
527 {
528 	void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
529 	/* The length reported is including the length field of 4 bytes,
530 	 * hence subtract with 4.
531 	 */
532 	const u16 buff_offset = 4;
533 
534 	/* Modem port dl configuration */
535 	dc->port[PORT_MDM].dl_addr[CH_A] = offset;
536 	dc->port[PORT_MDM].dl_addr[CH_B] =
537 				(offset += dc->config_table.dl_mdm_len1);
538 	dc->port[PORT_MDM].dl_size[CH_A] =
539 				dc->config_table.dl_mdm_len1 - buff_offset;
540 	dc->port[PORT_MDM].dl_size[CH_B] =
541 				dc->config_table.dl_mdm_len2 - buff_offset;
542 
543 	/* Diag port dl configuration */
544 	dc->port[PORT_DIAG].dl_addr[CH_A] =
545 				(offset += dc->config_table.dl_mdm_len2);
546 	dc->port[PORT_DIAG].dl_size[CH_A] =
547 				dc->config_table.dl_diag_len1 - buff_offset;
548 	dc->port[PORT_DIAG].dl_addr[CH_B] =
549 				(offset += dc->config_table.dl_diag_len1);
550 	dc->port[PORT_DIAG].dl_size[CH_B] =
551 				dc->config_table.dl_diag_len2 - buff_offset;
552 
553 	/* App1 port dl configuration */
554 	dc->port[PORT_APP1].dl_addr[CH_A] =
555 				(offset += dc->config_table.dl_diag_len2);
556 	dc->port[PORT_APP1].dl_size[CH_A] =
557 				dc->config_table.dl_app1_len - buff_offset;
558 
559 	/* App2 port dl configuration */
560 	dc->port[PORT_APP2].dl_addr[CH_A] =
561 				(offset += dc->config_table.dl_app1_len);
562 	dc->port[PORT_APP2].dl_size[CH_A] =
563 				dc->config_table.dl_app2_len - buff_offset;
564 
565 	/* Ctrl dl configuration */
566 	dc->port[PORT_CTRL].dl_addr[CH_A] =
567 				(offset += dc->config_table.dl_app2_len);
568 	dc->port[PORT_CTRL].dl_size[CH_A] =
569 				dc->config_table.dl_ctrl_len - buff_offset;
570 
571 	offset = dc->base_addr + dc->config_table.ul_start;
572 
573 	/* Modem Port ul configuration */
574 	dc->port[PORT_MDM].ul_addr[CH_A] = offset;
575 	dc->port[PORT_MDM].ul_size[CH_A] =
576 				dc->config_table.ul_mdm_len1 - buff_offset;
577 	dc->port[PORT_MDM].ul_addr[CH_B] =
578 				(offset += dc->config_table.ul_mdm_len1);
579 	dc->port[PORT_MDM].ul_size[CH_B] =
580 				dc->config_table.ul_mdm_len2 - buff_offset;
581 
582 	/* Diag port ul configuration */
583 	dc->port[PORT_DIAG].ul_addr[CH_A] =
584 				(offset += dc->config_table.ul_mdm_len2);
585 	dc->port[PORT_DIAG].ul_size[CH_A] =
586 				dc->config_table.ul_diag_len - buff_offset;
587 
588 	/* App1 port ul configuration */
589 	dc->port[PORT_APP1].ul_addr[CH_A] =
590 				(offset += dc->config_table.ul_diag_len);
591 	dc->port[PORT_APP1].ul_size[CH_A] =
592 				dc->config_table.ul_app1_len - buff_offset;
593 
594 	/* App2 port ul configuration */
595 	dc->port[PORT_APP2].ul_addr[CH_A] =
596 				(offset += dc->config_table.ul_app1_len);
597 	dc->port[PORT_APP2].ul_size[CH_A] =
598 				dc->config_table.ul_app2_len - buff_offset;
599 
600 	/* Ctrl ul configuration */
601 	dc->port[PORT_CTRL].ul_addr[CH_A] =
602 				(offset += dc->config_table.ul_app2_len);
603 	dc->port[PORT_CTRL].ul_size[CH_A] =
604 				dc->config_table.ul_ctrl_len - buff_offset;
605 }
606 
607 /* Dump config table under initalization phase */
608 #ifdef DEBUG
609 static void dump_table(const struct nozomi *dc)
610 {
611 	DBG3("signature: 0x%08X", dc->config_table.signature);
612 	DBG3("version: 0x%04X", dc->config_table.version);
613 	DBG3("product_information: 0x%04X", \
614 				dc->config_table.product_information);
615 	DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
616 	DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
617 	DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
618 	DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
619 
620 	DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
621 	DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
622 	   dc->config_table.dl_mdm_len1);
623 	DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
624 	   dc->config_table.dl_mdm_len2);
625 	DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
626 	   dc->config_table.dl_diag_len1);
627 	DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
628 	   dc->config_table.dl_diag_len2);
629 	DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
630 	   dc->config_table.dl_app1_len);
631 	DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
632 	   dc->config_table.dl_app2_len);
633 	DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
634 	   dc->config_table.dl_ctrl_len);
635 	DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
636 	   dc->config_table.ul_start);
637 	DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
638 	   dc->config_table.ul_mdm_len1);
639 	DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
640 	   dc->config_table.ul_mdm_len2);
641 	DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
642 	   dc->config_table.ul_diag_len);
643 	DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
644 	   dc->config_table.ul_app1_len);
645 	DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
646 	   dc->config_table.ul_app2_len);
647 	DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
648 	   dc->config_table.ul_ctrl_len);
649 }
650 #else
651 static inline void dump_table(const struct nozomi *dc) { }
652 #endif
653 
654 /*
655  * Read configuration table from card under intalization phase
656  * Returns 1 if ok, else 0
657  */
658 static int nozomi_read_config_table(struct nozomi *dc)
659 {
660 	read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
661 						sizeof(struct config_table));
662 
663 	if (dc->config_table.signature != CONFIG_MAGIC) {
664 		dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
665 			dc->config_table.signature, CONFIG_MAGIC);
666 		return 0;
667 	}
668 
669 	if ((dc->config_table.version == 0)
670 	    || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
671 		int i;
672 		DBG1("Second phase, configuring card");
673 
674 		nozomi_setup_memory(dc);
675 
676 		dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
677 		dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
678 		dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
679 		DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
680 		   dc->port[PORT_MDM].toggle_ul,
681 		   dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
682 
683 		dump_table(dc);
684 
685 		for (i = PORT_MDM; i < MAX_PORT; i++) {
686 			memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
687 			memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
688 		}
689 
690 		/* Enable control channel */
691 		dc->last_ier = dc->last_ier | CTRL_DL;
692 		writew(dc->last_ier, dc->reg_ier);
693 
694 		dc->state = NOZOMI_STATE_ALLOCATED;
695 		dev_info(&dc->pdev->dev, "Initialization OK!\n");
696 		return 1;
697 	}
698 
699 	if ((dc->config_table.version > 0)
700 	    && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
701 		u32 offset = 0;
702 		DBG1("First phase: pushing upload buffers, clearing download");
703 
704 		dev_info(&dc->pdev->dev, "Version of card: %d\n",
705 			 dc->config_table.version);
706 
707 		/* Here we should disable all I/O over F32. */
708 		nozomi_setup_memory(dc);
709 
710 		/*
711 		 * We should send ALL channel pair tokens back along
712 		 * with reset token
713 		 */
714 
715 		/* push upload modem buffers */
716 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
717 			(u32 *) &offset, 4);
718 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
719 			(u32 *) &offset, 4);
720 
721 		writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
722 
723 		DBG1("First phase done");
724 	}
725 
726 	return 1;
727 }
728 
729 /* Enable uplink interrupts  */
730 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
731 {
732 	static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
733 
734 	if (port < NOZOMI_MAX_PORTS) {
735 		dc->last_ier |= mask[port];
736 		writew(dc->last_ier, dc->reg_ier);
737 	} else {
738 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
739 	}
740 }
741 
742 /* Disable uplink interrupts  */
743 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
744 {
745 	static const u16 mask[] =
746 		{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
747 
748 	if (port < NOZOMI_MAX_PORTS) {
749 		dc->last_ier &= mask[port];
750 		writew(dc->last_ier, dc->reg_ier);
751 	} else {
752 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
753 	}
754 }
755 
756 /* Enable downlink interrupts */
757 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
758 {
759 	static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
760 
761 	if (port < NOZOMI_MAX_PORTS) {
762 		dc->last_ier |= mask[port];
763 		writew(dc->last_ier, dc->reg_ier);
764 	} else {
765 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
766 	}
767 }
768 
769 /* Disable downlink interrupts */
770 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
771 {
772 	static const u16 mask[] =
773 		{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
774 
775 	if (port < NOZOMI_MAX_PORTS) {
776 		dc->last_ier &= mask[port];
777 		writew(dc->last_ier, dc->reg_ier);
778 	} else {
779 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
780 	}
781 }
782 
783 /*
784  * Return 1 - send buffer to card and ack.
785  * Return 0 - don't ack, don't send buffer to card.
786  */
787 static int send_data(enum port_type index, struct nozomi *dc)
788 {
789 	u32 size = 0;
790 	struct port *port = &dc->port[index];
791 	const u8 toggle = port->toggle_ul;
792 	void __iomem *addr = port->ul_addr[toggle];
793 	const u32 ul_size = port->ul_size[toggle];
794 
795 	/* Get data from tty and place in buf for now */
796 	size = kfifo_out(&port->fifo_ul, dc->send_buf,
797 			   ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
798 
799 	if (size == 0) {
800 		DBG4("No more data to send, disable link:");
801 		return 0;
802 	}
803 
804 	/* DUMP(buf, size); */
805 
806 	/* Write length + data */
807 	write_mem32(addr, (u32 *) &size, 4);
808 	write_mem32(addr + 4, (u32 *) dc->send_buf, size);
809 
810 	tty_port_tty_wakeup(&port->port);
811 
812 	return 1;
813 }
814 
815 /* If all data has been read, return 1, else 0 */
816 static int receive_data(enum port_type index, struct nozomi *dc)
817 {
818 	u8 buf[RECEIVE_BUF_MAX] = { 0 };
819 	int size;
820 	u32 offset = 4;
821 	struct port *port = &dc->port[index];
822 	void __iomem *addr = port->dl_addr[port->toggle_dl];
823 	struct tty_struct *tty = tty_port_tty_get(&port->port);
824 	int i, ret;
825 
826 	read_mem32((u32 *) &size, addr, 4);
827 	/*  DBG1( "%d bytes port: %d", size, index); */
828 
829 	if (tty && test_bit(TTY_THROTTLED, &tty->flags)) {
830 		DBG1("No room in tty, don't read data, don't ack interrupt, "
831 			"disable interrupt");
832 
833 		/* disable interrupt in downlink... */
834 		disable_transmit_dl(index, dc);
835 		ret = 0;
836 		goto put;
837 	}
838 
839 	if (unlikely(size == 0)) {
840 		dev_err(&dc->pdev->dev, "size == 0?\n");
841 		ret = 1;
842 		goto put;
843 	}
844 
845 	while (size > 0) {
846 		read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
847 
848 		if (size == 1) {
849 			tty_insert_flip_char(&port->port, buf[0], TTY_NORMAL);
850 			size = 0;
851 		} else if (size < RECEIVE_BUF_MAX) {
852 			size -= tty_insert_flip_string(&port->port,
853 					(char *)buf, size);
854 		} else {
855 			i = tty_insert_flip_string(&port->port,
856 					(char *)buf, RECEIVE_BUF_MAX);
857 			size -= i;
858 			offset += i;
859 		}
860 	}
861 
862 	set_bit(index, &dc->flip);
863 	ret = 1;
864 put:
865 	tty_kref_put(tty);
866 	return ret;
867 }
868 
869 /* Debug for interrupts */
870 #ifdef DEBUG
871 static char *interrupt2str(u16 interrupt)
872 {
873 	static char buf[TMP_BUF_MAX];
874 	char *p = buf;
875 
876 	interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
877 	interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
878 					"MDM_DL2 ") : NULL;
879 
880 	interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
881 					"MDM_UL1 ") : NULL;
882 	interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
883 					"MDM_UL2 ") : NULL;
884 
885 	interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
886 					"DIAG_DL1 ") : NULL;
887 	interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
888 					"DIAG_DL2 ") : NULL;
889 
890 	interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
891 					"DIAG_UL ") : NULL;
892 
893 	interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
894 					"APP1_DL ") : NULL;
895 	interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
896 					"APP2_DL ") : NULL;
897 
898 	interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
899 					"APP1_UL ") : NULL;
900 	interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
901 					"APP2_UL ") : NULL;
902 
903 	interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
904 					"CTRL_DL ") : NULL;
905 	interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
906 					"CTRL_UL ") : NULL;
907 
908 	interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
909 					"RESET ") : NULL;
910 
911 	return buf;
912 }
913 #endif
914 
915 /*
916  * Receive flow control
917  * Return 1 - If ok, else 0
918  */
919 static int receive_flow_control(struct nozomi *dc)
920 {
921 	enum port_type port = PORT_MDM;
922 	struct ctrl_dl ctrl_dl;
923 	struct ctrl_dl old_ctrl;
924 	u16 enable_ier = 0;
925 
926 	read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
927 
928 	switch (ctrl_dl.port) {
929 	case CTRL_CMD:
930 		DBG1("The Base Band sends this value as a response to a "
931 			"request for IMSI detach sent over the control "
932 			"channel uplink (see section 7.6.1).");
933 		break;
934 	case CTRL_MDM:
935 		port = PORT_MDM;
936 		enable_ier = MDM_DL;
937 		break;
938 	case CTRL_DIAG:
939 		port = PORT_DIAG;
940 		enable_ier = DIAG_DL;
941 		break;
942 	case CTRL_APP1:
943 		port = PORT_APP1;
944 		enable_ier = APP1_DL;
945 		break;
946 	case CTRL_APP2:
947 		port = PORT_APP2;
948 		enable_ier = APP2_DL;
949 		if (dc->state == NOZOMI_STATE_ALLOCATED) {
950 			/*
951 			 * After card initialization the flow control
952 			 * received for APP2 is always the last
953 			 */
954 			dc->state = NOZOMI_STATE_READY;
955 			dev_info(&dc->pdev->dev, "Device READY!\n");
956 		}
957 		break;
958 	default:
959 		dev_err(&dc->pdev->dev,
960 			"ERROR: flow control received for non-existing port\n");
961 		return 0;
962 	}
963 
964 	DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
965 	   *((u16 *)&ctrl_dl));
966 
967 	old_ctrl = dc->port[port].ctrl_dl;
968 	dc->port[port].ctrl_dl = ctrl_dl;
969 
970 	if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
971 		DBG1("Disable interrupt (0x%04X) on port: %d",
972 			enable_ier, port);
973 		disable_transmit_ul(port, dc);
974 
975 	} else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
976 
977 		if (kfifo_len(&dc->port[port].fifo_ul)) {
978 			DBG1("Enable interrupt (0x%04X) on port: %d",
979 				enable_ier, port);
980 			DBG1("Data in buffer [%d], enable transmit! ",
981 				kfifo_len(&dc->port[port].fifo_ul));
982 			enable_transmit_ul(port, dc);
983 		} else {
984 			DBG1("No data in buffer...");
985 		}
986 	}
987 
988 	if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
989 		DBG1(" No change in mctrl");
990 		return 1;
991 	}
992 	/* Update statistics */
993 	if (old_ctrl.CTS != ctrl_dl.CTS)
994 		dc->port[port].tty_icount.cts++;
995 	if (old_ctrl.DSR != ctrl_dl.DSR)
996 		dc->port[port].tty_icount.dsr++;
997 	if (old_ctrl.RI != ctrl_dl.RI)
998 		dc->port[port].tty_icount.rng++;
999 	if (old_ctrl.DCD != ctrl_dl.DCD)
1000 		dc->port[port].tty_icount.dcd++;
1001 
1002 	wake_up_interruptible(&dc->port[port].tty_wait);
1003 
1004 	DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1005 	   port,
1006 	   dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1007 	   dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1008 
1009 	return 1;
1010 }
1011 
1012 static enum ctrl_port_type port2ctrl(enum port_type port,
1013 					const struct nozomi *dc)
1014 {
1015 	switch (port) {
1016 	case PORT_MDM:
1017 		return CTRL_MDM;
1018 	case PORT_DIAG:
1019 		return CTRL_DIAG;
1020 	case PORT_APP1:
1021 		return CTRL_APP1;
1022 	case PORT_APP2:
1023 		return CTRL_APP2;
1024 	default:
1025 		dev_err(&dc->pdev->dev,
1026 			"ERROR: send flow control " \
1027 			"received for non-existing port\n");
1028 	}
1029 	return CTRL_ERROR;
1030 }
1031 
1032 /*
1033  * Send flow control, can only update one channel at a time
1034  * Return 0 - If we have updated all flow control
1035  * Return 1 - If we need to update more flow control, ack current enable more
1036  */
1037 static int send_flow_control(struct nozomi *dc)
1038 {
1039 	u32 i, more_flow_control_to_be_updated = 0;
1040 	u16 *ctrl;
1041 
1042 	for (i = PORT_MDM; i < MAX_PORT; i++) {
1043 		if (dc->port[i].update_flow_control) {
1044 			if (more_flow_control_to_be_updated) {
1045 				/* We have more flow control to be updated */
1046 				return 1;
1047 			}
1048 			dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1049 			ctrl = (u16 *)&dc->port[i].ctrl_ul;
1050 			write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1051 				(u32 *) ctrl, 2);
1052 			dc->port[i].update_flow_control = 0;
1053 			more_flow_control_to_be_updated = 1;
1054 		}
1055 	}
1056 	return 0;
1057 }
1058 
1059 /*
1060  * Handle downlink data, ports that are handled are modem and diagnostics
1061  * Return 1 - ok
1062  * Return 0 - toggle fields are out of sync
1063  */
1064 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1065 			u16 read_iir, u16 mask1, u16 mask2)
1066 {
1067 	if (*toggle == 0 && read_iir & mask1) {
1068 		if (receive_data(port, dc)) {
1069 			writew(mask1, dc->reg_fcr);
1070 			*toggle = !(*toggle);
1071 		}
1072 
1073 		if (read_iir & mask2) {
1074 			if (receive_data(port, dc)) {
1075 				writew(mask2, dc->reg_fcr);
1076 				*toggle = !(*toggle);
1077 			}
1078 		}
1079 	} else if (*toggle == 1 && read_iir & mask2) {
1080 		if (receive_data(port, dc)) {
1081 			writew(mask2, dc->reg_fcr);
1082 			*toggle = !(*toggle);
1083 		}
1084 
1085 		if (read_iir & mask1) {
1086 			if (receive_data(port, dc)) {
1087 				writew(mask1, dc->reg_fcr);
1088 				*toggle = !(*toggle);
1089 			}
1090 		}
1091 	} else {
1092 		dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1093 			*toggle);
1094 		return 0;
1095 	}
1096 	return 1;
1097 }
1098 
1099 /*
1100  * Handle uplink data, this is currently for the modem port
1101  * Return 1 - ok
1102  * Return 0 - toggle field are out of sync
1103  */
1104 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1105 {
1106 	u8 *toggle = &(dc->port[port].toggle_ul);
1107 
1108 	if (*toggle == 0 && read_iir & MDM_UL1) {
1109 		dc->last_ier &= ~MDM_UL;
1110 		writew(dc->last_ier, dc->reg_ier);
1111 		if (send_data(port, dc)) {
1112 			writew(MDM_UL1, dc->reg_fcr);
1113 			dc->last_ier = dc->last_ier | MDM_UL;
1114 			writew(dc->last_ier, dc->reg_ier);
1115 			*toggle = !*toggle;
1116 		}
1117 
1118 		if (read_iir & MDM_UL2) {
1119 			dc->last_ier &= ~MDM_UL;
1120 			writew(dc->last_ier, dc->reg_ier);
1121 			if (send_data(port, dc)) {
1122 				writew(MDM_UL2, dc->reg_fcr);
1123 				dc->last_ier = dc->last_ier | MDM_UL;
1124 				writew(dc->last_ier, dc->reg_ier);
1125 				*toggle = !*toggle;
1126 			}
1127 		}
1128 
1129 	} else if (*toggle == 1 && read_iir & MDM_UL2) {
1130 		dc->last_ier &= ~MDM_UL;
1131 		writew(dc->last_ier, dc->reg_ier);
1132 		if (send_data(port, dc)) {
1133 			writew(MDM_UL2, dc->reg_fcr);
1134 			dc->last_ier = dc->last_ier | MDM_UL;
1135 			writew(dc->last_ier, dc->reg_ier);
1136 			*toggle = !*toggle;
1137 		}
1138 
1139 		if (read_iir & MDM_UL1) {
1140 			dc->last_ier &= ~MDM_UL;
1141 			writew(dc->last_ier, dc->reg_ier);
1142 			if (send_data(port, dc)) {
1143 				writew(MDM_UL1, dc->reg_fcr);
1144 				dc->last_ier = dc->last_ier | MDM_UL;
1145 				writew(dc->last_ier, dc->reg_ier);
1146 				*toggle = !*toggle;
1147 			}
1148 		}
1149 	} else {
1150 		writew(read_iir & MDM_UL, dc->reg_fcr);
1151 		dev_err(&dc->pdev->dev, "port out of sync!\n");
1152 		return 0;
1153 	}
1154 	return 1;
1155 }
1156 
1157 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1158 {
1159 	struct nozomi *dc = dev_id;
1160 	unsigned int a;
1161 	u16 read_iir;
1162 
1163 	if (!dc)
1164 		return IRQ_NONE;
1165 
1166 	spin_lock(&dc->spin_mutex);
1167 	read_iir = readw(dc->reg_iir);
1168 
1169 	/* Card removed */
1170 	if (read_iir == (u16)-1)
1171 		goto none;
1172 	/*
1173 	 * Just handle interrupt enabled in IER
1174 	 * (by masking with dc->last_ier)
1175 	 */
1176 	read_iir &= dc->last_ier;
1177 
1178 	if (read_iir == 0)
1179 		goto none;
1180 
1181 
1182 	DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1183 		dc->last_ier);
1184 
1185 	if (read_iir & RESET) {
1186 		if (unlikely(!nozomi_read_config_table(dc))) {
1187 			dc->last_ier = 0x0;
1188 			writew(dc->last_ier, dc->reg_ier);
1189 			dev_err(&dc->pdev->dev, "Could not read status from "
1190 				"card, we should disable interface\n");
1191 		} else {
1192 			writew(RESET, dc->reg_fcr);
1193 		}
1194 		/* No more useful info if this was the reset interrupt. */
1195 		goto exit_handler;
1196 	}
1197 	if (read_iir & CTRL_UL) {
1198 		DBG1("CTRL_UL");
1199 		dc->last_ier &= ~CTRL_UL;
1200 		writew(dc->last_ier, dc->reg_ier);
1201 		if (send_flow_control(dc)) {
1202 			writew(CTRL_UL, dc->reg_fcr);
1203 			dc->last_ier = dc->last_ier | CTRL_UL;
1204 			writew(dc->last_ier, dc->reg_ier);
1205 		}
1206 	}
1207 	if (read_iir & CTRL_DL) {
1208 		receive_flow_control(dc);
1209 		writew(CTRL_DL, dc->reg_fcr);
1210 	}
1211 	if (read_iir & MDM_DL) {
1212 		if (!handle_data_dl(dc, PORT_MDM,
1213 				&(dc->port[PORT_MDM].toggle_dl), read_iir,
1214 				MDM_DL1, MDM_DL2)) {
1215 			dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1216 			goto exit_handler;
1217 		}
1218 	}
1219 	if (read_iir & MDM_UL) {
1220 		if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1221 			dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1222 			goto exit_handler;
1223 		}
1224 	}
1225 	if (read_iir & DIAG_DL) {
1226 		if (!handle_data_dl(dc, PORT_DIAG,
1227 				&(dc->port[PORT_DIAG].toggle_dl), read_iir,
1228 				DIAG_DL1, DIAG_DL2)) {
1229 			dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1230 			goto exit_handler;
1231 		}
1232 	}
1233 	if (read_iir & DIAG_UL) {
1234 		dc->last_ier &= ~DIAG_UL;
1235 		writew(dc->last_ier, dc->reg_ier);
1236 		if (send_data(PORT_DIAG, dc)) {
1237 			writew(DIAG_UL, dc->reg_fcr);
1238 			dc->last_ier = dc->last_ier | DIAG_UL;
1239 			writew(dc->last_ier, dc->reg_ier);
1240 		}
1241 	}
1242 	if (read_iir & APP1_DL) {
1243 		if (receive_data(PORT_APP1, dc))
1244 			writew(APP1_DL, dc->reg_fcr);
1245 	}
1246 	if (read_iir & APP1_UL) {
1247 		dc->last_ier &= ~APP1_UL;
1248 		writew(dc->last_ier, dc->reg_ier);
1249 		if (send_data(PORT_APP1, dc)) {
1250 			writew(APP1_UL, dc->reg_fcr);
1251 			dc->last_ier = dc->last_ier | APP1_UL;
1252 			writew(dc->last_ier, dc->reg_ier);
1253 		}
1254 	}
1255 	if (read_iir & APP2_DL) {
1256 		if (receive_data(PORT_APP2, dc))
1257 			writew(APP2_DL, dc->reg_fcr);
1258 	}
1259 	if (read_iir & APP2_UL) {
1260 		dc->last_ier &= ~APP2_UL;
1261 		writew(dc->last_ier, dc->reg_ier);
1262 		if (send_data(PORT_APP2, dc)) {
1263 			writew(APP2_UL, dc->reg_fcr);
1264 			dc->last_ier = dc->last_ier | APP2_UL;
1265 			writew(dc->last_ier, dc->reg_ier);
1266 		}
1267 	}
1268 
1269 exit_handler:
1270 	spin_unlock(&dc->spin_mutex);
1271 
1272 	for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1273 		if (test_and_clear_bit(a, &dc->flip))
1274 			tty_flip_buffer_push(&dc->port[a].port);
1275 
1276 	return IRQ_HANDLED;
1277 none:
1278 	spin_unlock(&dc->spin_mutex);
1279 	return IRQ_NONE;
1280 }
1281 
1282 static void nozomi_get_card_type(struct nozomi *dc)
1283 {
1284 	int i;
1285 	u32 size = 0;
1286 
1287 	for (i = 0; i < 6; i++)
1288 		size += pci_resource_len(dc->pdev, i);
1289 
1290 	/* Assume card type F32_8 if no match */
1291 	dc->card_type = size == 2048 ? F32_2 : F32_8;
1292 
1293 	dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1294 }
1295 
1296 static void nozomi_setup_private_data(struct nozomi *dc)
1297 {
1298 	void __iomem *offset = dc->base_addr + dc->card_type / 2;
1299 	unsigned int i;
1300 
1301 	dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1302 	dc->reg_iir = (void __iomem *)(offset + R_IIR);
1303 	dc->reg_ier = (void __iomem *)(offset + R_IER);
1304 	dc->last_ier = 0;
1305 	dc->flip = 0;
1306 
1307 	dc->port[PORT_MDM].token_dl = MDM_DL;
1308 	dc->port[PORT_DIAG].token_dl = DIAG_DL;
1309 	dc->port[PORT_APP1].token_dl = APP1_DL;
1310 	dc->port[PORT_APP2].token_dl = APP2_DL;
1311 
1312 	for (i = 0; i < MAX_PORT; i++)
1313 		init_waitqueue_head(&dc->port[i].tty_wait);
1314 }
1315 
1316 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1317 			  char *buf)
1318 {
1319 	const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1320 
1321 	return sprintf(buf, "%d\n", dc->card_type);
1322 }
1323 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1324 
1325 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1326 			  char *buf)
1327 {
1328 	const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1329 
1330 	return sprintf(buf, "%u\n", dc->open_ttys);
1331 }
1332 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1333 
1334 static void make_sysfs_files(struct nozomi *dc)
1335 {
1336 	if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1337 		dev_err(&dc->pdev->dev,
1338 			"Could not create sysfs file for card_type\n");
1339 	if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1340 		dev_err(&dc->pdev->dev,
1341 			"Could not create sysfs file for open_ttys\n");
1342 }
1343 
1344 static void remove_sysfs_files(struct nozomi *dc)
1345 {
1346 	device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1347 	device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1348 }
1349 
1350 /* Allocate memory for one device */
1351 static int nozomi_card_init(struct pci_dev *pdev,
1352 				      const struct pci_device_id *ent)
1353 {
1354 	resource_size_t start;
1355 	int ret;
1356 	struct nozomi *dc = NULL;
1357 	int ndev_idx;
1358 	int i;
1359 
1360 	dev_dbg(&pdev->dev, "Init, new card found\n");
1361 
1362 	for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1363 		if (!ndevs[ndev_idx])
1364 			break;
1365 
1366 	if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1367 		dev_err(&pdev->dev, "no free tty range for this card left\n");
1368 		ret = -EIO;
1369 		goto err;
1370 	}
1371 
1372 	dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1373 	if (unlikely(!dc)) {
1374 		dev_err(&pdev->dev, "Could not allocate memory\n");
1375 		ret = -ENOMEM;
1376 		goto err_free;
1377 	}
1378 
1379 	dc->pdev = pdev;
1380 
1381 	ret = pci_enable_device(dc->pdev);
1382 	if (ret) {
1383 		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1384 		goto err_free;
1385 	}
1386 
1387 	ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1388 	if (ret) {
1389 		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1390 			(int) /* nozomi_private.io_addr */ 0);
1391 		goto err_disable_device;
1392 	}
1393 
1394 	start = pci_resource_start(dc->pdev, 0);
1395 	if (start == 0) {
1396 		dev_err(&pdev->dev, "No I/O address for card detected\n");
1397 		ret = -ENODEV;
1398 		goto err_rel_regs;
1399 	}
1400 
1401 	/* Find out what card type it is */
1402 	nozomi_get_card_type(dc);
1403 
1404 	dc->base_addr = ioremap_nocache(start, dc->card_type);
1405 	if (!dc->base_addr) {
1406 		dev_err(&pdev->dev, "Unable to map card MMIO\n");
1407 		ret = -ENODEV;
1408 		goto err_rel_regs;
1409 	}
1410 
1411 	dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1412 	if (!dc->send_buf) {
1413 		dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1414 		ret = -ENOMEM;
1415 		goto err_free_sbuf;
1416 	}
1417 
1418 	for (i = PORT_MDM; i < MAX_PORT; i++) {
1419 		if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1420 					GFP_KERNEL)) {
1421 			dev_err(&pdev->dev,
1422 					"Could not allocate kfifo buffer\n");
1423 			ret = -ENOMEM;
1424 			goto err_free_kfifo;
1425 		}
1426 	}
1427 
1428 	spin_lock_init(&dc->spin_mutex);
1429 
1430 	nozomi_setup_private_data(dc);
1431 
1432 	/* Disable all interrupts */
1433 	dc->last_ier = 0;
1434 	writew(dc->last_ier, dc->reg_ier);
1435 
1436 	ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1437 			NOZOMI_NAME, dc);
1438 	if (unlikely(ret)) {
1439 		dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1440 		goto err_free_kfifo;
1441 	}
1442 
1443 	DBG1("base_addr: %p", dc->base_addr);
1444 
1445 	make_sysfs_files(dc);
1446 
1447 	dc->index_start = ndev_idx * MAX_PORT;
1448 	ndevs[ndev_idx] = dc;
1449 
1450 	pci_set_drvdata(pdev, dc);
1451 
1452 	/* Enable RESET interrupt */
1453 	dc->last_ier = RESET;
1454 	iowrite16(dc->last_ier, dc->reg_ier);
1455 
1456 	dc->state = NOZOMI_STATE_ENABLED;
1457 
1458 	for (i = 0; i < MAX_PORT; i++) {
1459 		struct device *tty_dev;
1460 		struct port *port = &dc->port[i];
1461 		port->dc = dc;
1462 		tty_port_init(&port->port);
1463 		port->port.ops = &noz_tty_port_ops;
1464 		tty_dev = tty_port_register_device(&port->port, ntty_driver,
1465 				dc->index_start + i, &pdev->dev);
1466 
1467 		if (IS_ERR(tty_dev)) {
1468 			ret = PTR_ERR(tty_dev);
1469 			dev_err(&pdev->dev, "Could not allocate tty?\n");
1470 			tty_port_destroy(&port->port);
1471 			goto err_free_tty;
1472 		}
1473 	}
1474 
1475 	return 0;
1476 
1477 err_free_tty:
1478 	for (i = 0; i < MAX_PORT; ++i) {
1479 		tty_unregister_device(ntty_driver, dc->index_start + i);
1480 		tty_port_destroy(&dc->port[i].port);
1481 	}
1482 err_free_kfifo:
1483 	for (i = 0; i < MAX_PORT; i++)
1484 		kfifo_free(&dc->port[i].fifo_ul);
1485 err_free_sbuf:
1486 	kfree(dc->send_buf);
1487 	iounmap(dc->base_addr);
1488 err_rel_regs:
1489 	pci_release_regions(pdev);
1490 err_disable_device:
1491 	pci_disable_device(pdev);
1492 err_free:
1493 	kfree(dc);
1494 err:
1495 	return ret;
1496 }
1497 
1498 static void tty_exit(struct nozomi *dc)
1499 {
1500 	unsigned int i;
1501 
1502 	DBG1(" ");
1503 
1504 	for (i = 0; i < MAX_PORT; ++i)
1505 		tty_port_tty_hangup(&dc->port[i].port, false);
1506 
1507 	/* Racy below - surely should wait for scheduled work to be done or
1508 	   complete off a hangup method ? */
1509 	while (dc->open_ttys)
1510 		msleep(1);
1511 	for (i = 0; i < MAX_PORT; ++i) {
1512 		tty_unregister_device(ntty_driver, dc->index_start + i);
1513 		tty_port_destroy(&dc->port[i].port);
1514 	}
1515 }
1516 
1517 /* Deallocate memory for one device */
1518 static void nozomi_card_exit(struct pci_dev *pdev)
1519 {
1520 	int i;
1521 	struct ctrl_ul ctrl;
1522 	struct nozomi *dc = pci_get_drvdata(pdev);
1523 
1524 	/* Disable all interrupts */
1525 	dc->last_ier = 0;
1526 	writew(dc->last_ier, dc->reg_ier);
1527 
1528 	tty_exit(dc);
1529 
1530 	/* Send 0x0001, command card to resend the reset token.  */
1531 	/* This is to get the reset when the module is reloaded. */
1532 	ctrl.port = 0x00;
1533 	ctrl.reserved = 0;
1534 	ctrl.RTS = 0;
1535 	ctrl.DTR = 1;
1536 	DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1537 
1538 	/* Setup dc->reg addresses to we can use defines here */
1539 	write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1540 	writew(CTRL_UL, dc->reg_fcr);	/* push the token to the card. */
1541 
1542 	remove_sysfs_files(dc);
1543 
1544 	free_irq(pdev->irq, dc);
1545 
1546 	for (i = 0; i < MAX_PORT; i++)
1547 		kfifo_free(&dc->port[i].fifo_ul);
1548 
1549 	kfree(dc->send_buf);
1550 
1551 	iounmap(dc->base_addr);
1552 
1553 	pci_release_regions(pdev);
1554 
1555 	pci_disable_device(pdev);
1556 
1557 	ndevs[dc->index_start / MAX_PORT] = NULL;
1558 
1559 	kfree(dc);
1560 }
1561 
1562 static void set_rts(const struct tty_struct *tty, int rts)
1563 {
1564 	struct port *port = get_port_by_tty(tty);
1565 
1566 	port->ctrl_ul.RTS = rts;
1567 	port->update_flow_control = 1;
1568 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1569 }
1570 
1571 static void set_dtr(const struct tty_struct *tty, int dtr)
1572 {
1573 	struct port *port = get_port_by_tty(tty);
1574 
1575 	DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1576 
1577 	port->ctrl_ul.DTR = dtr;
1578 	port->update_flow_control = 1;
1579 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1580 }
1581 
1582 /*
1583  * ----------------------------------------------------------------------------
1584  * TTY code
1585  * ----------------------------------------------------------------------------
1586  */
1587 
1588 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1589 {
1590 	struct port *port = get_port_by_tty(tty);
1591 	struct nozomi *dc = get_dc_by_tty(tty);
1592 	int ret;
1593 	if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1594 		return -ENODEV;
1595 	ret = tty_standard_install(driver, tty);
1596 	if (ret == 0)
1597 		tty->driver_data = port;
1598 	return ret;
1599 }
1600 
1601 static void ntty_cleanup(struct tty_struct *tty)
1602 {
1603 	tty->driver_data = NULL;
1604 }
1605 
1606 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1607 {
1608 	struct port *port = container_of(tport, struct port, port);
1609 	struct nozomi *dc = port->dc;
1610 	unsigned long flags;
1611 
1612 	DBG1("open: %d", port->token_dl);
1613 	spin_lock_irqsave(&dc->spin_mutex, flags);
1614 	dc->last_ier = dc->last_ier | port->token_dl;
1615 	writew(dc->last_ier, dc->reg_ier);
1616 	dc->open_ttys++;
1617 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1618 	printk("noz: activated %d: %p\n", tty->index, tport);
1619 	return 0;
1620 }
1621 
1622 static int ntty_open(struct tty_struct *tty, struct file *filp)
1623 {
1624 	struct port *port = tty->driver_data;
1625 	return tty_port_open(&port->port, tty, filp);
1626 }
1627 
1628 static void ntty_shutdown(struct tty_port *tport)
1629 {
1630 	struct port *port = container_of(tport, struct port, port);
1631 	struct nozomi *dc = port->dc;
1632 	unsigned long flags;
1633 
1634 	DBG1("close: %d", port->token_dl);
1635 	spin_lock_irqsave(&dc->spin_mutex, flags);
1636 	dc->last_ier &= ~(port->token_dl);
1637 	writew(dc->last_ier, dc->reg_ier);
1638 	dc->open_ttys--;
1639 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1640 	printk("noz: shutdown %p\n", tport);
1641 }
1642 
1643 static void ntty_close(struct tty_struct *tty, struct file *filp)
1644 {
1645 	struct port *port = tty->driver_data;
1646 	if (port)
1647 		tty_port_close(&port->port, tty, filp);
1648 }
1649 
1650 static void ntty_hangup(struct tty_struct *tty)
1651 {
1652 	struct port *port = tty->driver_data;
1653 	tty_port_hangup(&port->port);
1654 }
1655 
1656 /*
1657  * called when the userspace process writes to the tty (/dev/noz*).
1658  * Data is inserted into a fifo, which is then read and transferred to the modem.
1659  */
1660 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1661 		      int count)
1662 {
1663 	int rval = -EINVAL;
1664 	struct nozomi *dc = get_dc_by_tty(tty);
1665 	struct port *port = tty->driver_data;
1666 	unsigned long flags;
1667 
1668 	/* DBG1( "WRITEx: %d, index = %d", count, index); */
1669 
1670 	if (!dc || !port)
1671 		return -ENODEV;
1672 
1673 	rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1674 
1675 	spin_lock_irqsave(&dc->spin_mutex, flags);
1676 	/* CTS is only valid on the modem channel */
1677 	if (port == &(dc->port[PORT_MDM])) {
1678 		if (port->ctrl_dl.CTS) {
1679 			DBG4("Enable interrupt");
1680 			enable_transmit_ul(tty->index % MAX_PORT, dc);
1681 		} else {
1682 			dev_err(&dc->pdev->dev,
1683 				"CTS not active on modem port?\n");
1684 		}
1685 	} else {
1686 		enable_transmit_ul(tty->index % MAX_PORT, dc);
1687 	}
1688 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1689 
1690 	return rval;
1691 }
1692 
1693 /*
1694  * Calculate how much is left in device
1695  * This method is called by the upper tty layer.
1696  *   #according to sources N_TTY.c it expects a value >= 0 and
1697  *    does not check for negative values.
1698  *
1699  * If the port is unplugged report lots of room and let the bits
1700  * dribble away so we don't block anything.
1701  */
1702 static int ntty_write_room(struct tty_struct *tty)
1703 {
1704 	struct port *port = tty->driver_data;
1705 	int room = 4096;
1706 	const struct nozomi *dc = get_dc_by_tty(tty);
1707 
1708 	if (dc)
1709 		room = kfifo_avail(&port->fifo_ul);
1710 
1711 	return room;
1712 }
1713 
1714 /* Gets io control parameters */
1715 static int ntty_tiocmget(struct tty_struct *tty)
1716 {
1717 	const struct port *port = tty->driver_data;
1718 	const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1719 	const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1720 
1721 	/* Note: these could change under us but it is not clear this
1722 	   matters if so */
1723 	return	(ctrl_ul->RTS ? TIOCM_RTS : 0) |
1724 		(ctrl_ul->DTR ? TIOCM_DTR : 0) |
1725 		(ctrl_dl->DCD ? TIOCM_CAR : 0) |
1726 		(ctrl_dl->RI  ? TIOCM_RNG : 0) |
1727 		(ctrl_dl->DSR ? TIOCM_DSR : 0) |
1728 		(ctrl_dl->CTS ? TIOCM_CTS : 0);
1729 }
1730 
1731 /* Sets io controls parameters */
1732 static int ntty_tiocmset(struct tty_struct *tty,
1733 					unsigned int set, unsigned int clear)
1734 {
1735 	struct nozomi *dc = get_dc_by_tty(tty);
1736 	unsigned long flags;
1737 
1738 	spin_lock_irqsave(&dc->spin_mutex, flags);
1739 	if (set & TIOCM_RTS)
1740 		set_rts(tty, 1);
1741 	else if (clear & TIOCM_RTS)
1742 		set_rts(tty, 0);
1743 
1744 	if (set & TIOCM_DTR)
1745 		set_dtr(tty, 1);
1746 	else if (clear & TIOCM_DTR)
1747 		set_dtr(tty, 0);
1748 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1749 
1750 	return 0;
1751 }
1752 
1753 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1754 		struct async_icount *cprev)
1755 {
1756 	const struct async_icount cnow = port->tty_icount;
1757 	int ret;
1758 
1759 	ret =	((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1760 		((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1761 		((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1762 		((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1763 
1764 	*cprev = cnow;
1765 
1766 	return ret;
1767 }
1768 
1769 static int ntty_tiocgicount(struct tty_struct *tty,
1770 				struct serial_icounter_struct *icount)
1771 {
1772 	struct port *port = tty->driver_data;
1773 	const struct async_icount cnow = port->tty_icount;
1774 
1775 	icount->cts = cnow.cts;
1776 	icount->dsr = cnow.dsr;
1777 	icount->rng = cnow.rng;
1778 	icount->dcd = cnow.dcd;
1779 	icount->rx = cnow.rx;
1780 	icount->tx = cnow.tx;
1781 	icount->frame = cnow.frame;
1782 	icount->overrun = cnow.overrun;
1783 	icount->parity = cnow.parity;
1784 	icount->brk = cnow.brk;
1785 	icount->buf_overrun = cnow.buf_overrun;
1786 	return 0;
1787 }
1788 
1789 static int ntty_ioctl(struct tty_struct *tty,
1790 		      unsigned int cmd, unsigned long arg)
1791 {
1792 	struct port *port = tty->driver_data;
1793 	int rval = -ENOIOCTLCMD;
1794 
1795 	DBG1("******** IOCTL, cmd: %d", cmd);
1796 
1797 	switch (cmd) {
1798 	case TIOCMIWAIT: {
1799 		struct async_icount cprev = port->tty_icount;
1800 
1801 		rval = wait_event_interruptible(port->tty_wait,
1802 				ntty_cflags_changed(port, arg, &cprev));
1803 		break;
1804 	}
1805 	default:
1806 		DBG1("ERR: 0x%08X, %d", cmd, cmd);
1807 		break;
1808 	}
1809 
1810 	return rval;
1811 }
1812 
1813 /*
1814  * Called by the upper tty layer when tty buffers are ready
1815  * to receive data again after a call to throttle.
1816  */
1817 static void ntty_unthrottle(struct tty_struct *tty)
1818 {
1819 	struct nozomi *dc = get_dc_by_tty(tty);
1820 	unsigned long flags;
1821 
1822 	DBG1("UNTHROTTLE");
1823 	spin_lock_irqsave(&dc->spin_mutex, flags);
1824 	enable_transmit_dl(tty->index % MAX_PORT, dc);
1825 	set_rts(tty, 1);
1826 
1827 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1828 }
1829 
1830 /*
1831  * Called by the upper tty layer when the tty buffers are almost full.
1832  * The driver should stop send more data.
1833  */
1834 static void ntty_throttle(struct tty_struct *tty)
1835 {
1836 	struct nozomi *dc = get_dc_by_tty(tty);
1837 	unsigned long flags;
1838 
1839 	DBG1("THROTTLE");
1840 	spin_lock_irqsave(&dc->spin_mutex, flags);
1841 	set_rts(tty, 0);
1842 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1843 }
1844 
1845 /* Returns number of chars in buffer, called by tty layer */
1846 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1847 {
1848 	struct port *port = tty->driver_data;
1849 	struct nozomi *dc = get_dc_by_tty(tty);
1850 	s32 rval = 0;
1851 
1852 	if (unlikely(!dc || !port)) {
1853 		goto exit_in_buffer;
1854 	}
1855 
1856 	rval = kfifo_len(&port->fifo_ul);
1857 
1858 exit_in_buffer:
1859 	return rval;
1860 }
1861 
1862 static const struct tty_port_operations noz_tty_port_ops = {
1863 	.activate = ntty_activate,
1864 	.shutdown = ntty_shutdown,
1865 };
1866 
1867 static const struct tty_operations tty_ops = {
1868 	.ioctl = ntty_ioctl,
1869 	.open = ntty_open,
1870 	.close = ntty_close,
1871 	.hangup = ntty_hangup,
1872 	.write = ntty_write,
1873 	.write_room = ntty_write_room,
1874 	.unthrottle = ntty_unthrottle,
1875 	.throttle = ntty_throttle,
1876 	.chars_in_buffer = ntty_chars_in_buffer,
1877 	.tiocmget = ntty_tiocmget,
1878 	.tiocmset = ntty_tiocmset,
1879 	.get_icount = ntty_tiocgicount,
1880 	.install = ntty_install,
1881 	.cleanup = ntty_cleanup,
1882 };
1883 
1884 /* Module initialization */
1885 static struct pci_driver nozomi_driver = {
1886 	.name = NOZOMI_NAME,
1887 	.id_table = nozomi_pci_tbl,
1888 	.probe = nozomi_card_init,
1889 	.remove = nozomi_card_exit,
1890 };
1891 
1892 static __init int nozomi_init(void)
1893 {
1894 	int ret;
1895 
1896 	printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1897 
1898 	ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1899 	if (!ntty_driver)
1900 		return -ENOMEM;
1901 
1902 	ntty_driver->driver_name = NOZOMI_NAME_TTY;
1903 	ntty_driver->name = "noz";
1904 	ntty_driver->major = 0;
1905 	ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1906 	ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1907 	ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1908 	ntty_driver->init_termios = tty_std_termios;
1909 	ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1910 						HUPCL | CLOCAL;
1911 	ntty_driver->init_termios.c_ispeed = 115200;
1912 	ntty_driver->init_termios.c_ospeed = 115200;
1913 	tty_set_operations(ntty_driver, &tty_ops);
1914 
1915 	ret = tty_register_driver(ntty_driver);
1916 	if (ret) {
1917 		printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1918 		goto free_tty;
1919 	}
1920 
1921 	ret = pci_register_driver(&nozomi_driver);
1922 	if (ret) {
1923 		printk(KERN_ERR "Nozomi: can't register pci driver\n");
1924 		goto unr_tty;
1925 	}
1926 
1927 	return 0;
1928 unr_tty:
1929 	tty_unregister_driver(ntty_driver);
1930 free_tty:
1931 	put_tty_driver(ntty_driver);
1932 	return ret;
1933 }
1934 
1935 static __exit void nozomi_exit(void)
1936 {
1937 	printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1938 	pci_unregister_driver(&nozomi_driver);
1939 	tty_unregister_driver(ntty_driver);
1940 	put_tty_driver(ntty_driver);
1941 }
1942 
1943 module_init(nozomi_init);
1944 module_exit(nozomi_exit);
1945 
1946 module_param(debug, int, S_IRUGO | S_IWUSR);
1947 
1948 MODULE_LICENSE("Dual BSD/GPL");
1949 MODULE_DESCRIPTION(DRIVER_DESC);
1950