1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
2 /*
3  * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
4  *
5  * Written by: Ulf Jakobsson,
6  *             Jan Åkerfeldt,
7  *             Stefan Thomasson,
8  *
9  * Maintained by: Paul Hardwick (p.hardwick@option.com)
10  *
11  * Patches:
12  *          Locking code changes for Vodafone by Sphere Systems Ltd,
13  *                              Andrew Bird (ajb@spheresystems.co.uk )
14  *                              & Phil Sanderson
15  *
16  * Source has been ported from an implementation made by Filip Aben @ Option
17  *
18  * --------------------------------------------------------------------------
19  *
20  * Copyright (c) 2005,2006 Option Wireless Sweden AB
21  * Copyright (c) 2006 Sphere Systems Ltd
22  * Copyright (c) 2006 Option Wireless n/v
23  * All rights Reserved.
24  *
25  * --------------------------------------------------------------------------
26  */
27 
28 /* Enable this to have a lot of debug printouts */
29 #define DEBUG
30 
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/pci.h>
34 #include <linux/ioport.h>
35 #include <linux/tty.h>
36 #include <linux/tty_driver.h>
37 #include <linux/tty_flip.h>
38 #include <linux/sched.h>
39 #include <linux/serial.h>
40 #include <linux/interrupt.h>
41 #include <linux/kmod.h>
42 #include <linux/init.h>
43 #include <linux/kfifo.h>
44 #include <linux/uaccess.h>
45 #include <linux/slab.h>
46 #include <asm/byteorder.h>
47 
48 #include <linux/delay.h>
49 
50 /* Default debug printout level */
51 #define NOZOMI_DEBUG_LEVEL 0x00
52 static int debug = NOZOMI_DEBUG_LEVEL;
53 module_param(debug, int, S_IRUGO | S_IWUSR);
54 
55 /*    Macros definitions */
56 #define DBG_(lvl, fmt, args...)				\
57 do {							\
58 	if (lvl & debug)				\
59 		pr_debug("[%d] %s(): " fmt "\n",	\
60 			 __LINE__, __func__,  ##args);	\
61 } while (0)
62 
63 #define DBG1(args...) DBG_(0x01, ##args)
64 #define DBG2(args...) DBG_(0x02, ##args)
65 #define DBG3(args...) DBG_(0x04, ##args)
66 #define DBG4(args...) DBG_(0x08, ##args)
67 
68 /* TODO: rewrite to optimize macros... */
69 
70 #define TMP_BUF_MAX 256
71 
72 #define DUMP(buf__, len__)						\
73 	do {								\
74 		char tbuf[TMP_BUF_MAX] = {0};				\
75 		if (len__ > 1) {					\
76 			u32 data_len = min_t(u32, len__, TMP_BUF_MAX);	\
77 			strscpy(tbuf, buf__, data_len);			\
78 			if (tbuf[data_len - 2] == '\r')			\
79 				tbuf[data_len - 2] = 'r';		\
80 			DBG1("SENDING: '%s' (%d+n)", tbuf, len__);	\
81 		} else {						\
82 			DBG1("SENDING: '%s' (%d)", tbuf, len__);	\
83 		}							\
84 	} while (0)
85 
86 /*    Defines */
87 #define NOZOMI_NAME		"nozomi"
88 #define NOZOMI_NAME_TTY		"nozomi_tty"
89 
90 #define NTTY_TTY_MAXMINORS	256
91 #define NTTY_FIFO_BUFFER_SIZE	8192
92 
93 /* Must be power of 2 */
94 #define FIFO_BUFFER_SIZE_UL	8192
95 
96 /* Size of tmp send buffer to card */
97 #define SEND_BUF_MAX		1024
98 #define RECEIVE_BUF_MAX		4
99 
100 
101 #define R_IIR			0x0000	/* Interrupt Identity Register */
102 #define R_FCR			0x0000	/* Flow Control Register */
103 #define R_IER			0x0004	/* Interrupt Enable Register */
104 
105 #define NOZOMI_CONFIG_MAGIC	0xEFEFFEFE
106 #define TOGGLE_VALID		0x0000
107 
108 /* Definition of interrupt tokens */
109 #define MDM_DL1			0x0001
110 #define MDM_UL1			0x0002
111 #define MDM_DL2			0x0004
112 #define MDM_UL2			0x0008
113 #define DIAG_DL1		0x0010
114 #define DIAG_DL2		0x0020
115 #define DIAG_UL			0x0040
116 #define APP1_DL			0x0080
117 #define APP1_UL			0x0100
118 #define APP2_DL			0x0200
119 #define APP2_UL			0x0400
120 #define CTRL_DL			0x0800
121 #define CTRL_UL			0x1000
122 #define RESET			0x8000
123 
124 #define MDM_DL			(MDM_DL1  | MDM_DL2)
125 #define MDM_UL			(MDM_UL1  | MDM_UL2)
126 #define DIAG_DL			(DIAG_DL1 | DIAG_DL2)
127 
128 /* modem signal definition */
129 #define CTRL_DSR		0x0001
130 #define CTRL_DCD		0x0002
131 #define CTRL_RI			0x0004
132 #define CTRL_CTS		0x0008
133 
134 #define CTRL_DTR		0x0001
135 #define CTRL_RTS		0x0002
136 
137 #define MAX_PORT		4
138 #define NOZOMI_MAX_PORTS	5
139 #define NOZOMI_MAX_CARDS	(NTTY_TTY_MAXMINORS / MAX_PORT)
140 
141 /*    Type definitions */
142 
143 /*
144  * There are two types of nozomi cards,
145  * one with 2048 memory and with 8192 memory
146  */
147 enum card_type {
148 	F32_2 = 2048,	/* 512 bytes downlink + uplink * 2 -> 2048 */
149 	F32_8 = 8192,	/* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
150 };
151 
152 /* Initialization states a card can be in */
153 enum card_state {
154 	NOZOMI_STATE_UNKNOWN	= 0,
155 	NOZOMI_STATE_ENABLED	= 1,	/* pci device enabled */
156 	NOZOMI_STATE_ALLOCATED	= 2,	/* config setup done */
157 	NOZOMI_STATE_READY	= 3,	/* flowcontrols received */
158 };
159 
160 /* Two different toggle channels exist */
161 enum channel_type {
162 	CH_A = 0,
163 	CH_B = 1,
164 };
165 
166 /* Port definition for the card regarding flow control */
167 enum ctrl_port_type {
168 	CTRL_CMD	= 0,
169 	CTRL_MDM	= 1,
170 	CTRL_DIAG	= 2,
171 	CTRL_APP1	= 3,
172 	CTRL_APP2	= 4,
173 	CTRL_ERROR	= -1,
174 };
175 
176 /* Ports that the nozomi has */
177 enum port_type {
178 	PORT_MDM	= 0,
179 	PORT_DIAG	= 1,
180 	PORT_APP1	= 2,
181 	PORT_APP2	= 3,
182 	PORT_CTRL	= 4,
183 	PORT_ERROR	= -1,
184 };
185 
186 #ifdef __BIG_ENDIAN
187 /* Big endian */
188 
189 struct toggles {
190 	unsigned int enabled:5;	/*
191 				 * Toggle fields are valid if enabled is 0,
192 				 * else A-channels must always be used.
193 				 */
194 	unsigned int diag_dl:1;
195 	unsigned int mdm_dl:1;
196 	unsigned int mdm_ul:1;
197 } __attribute__ ((packed));
198 
199 /* Configuration table to read at startup of card */
200 /* Is for now only needed during initialization phase */
201 struct config_table {
202 	u32 signature;
203 	u16 product_information;
204 	u16 version;
205 	u8 pad3[3];
206 	struct toggles toggle;
207 	u8 pad1[4];
208 	u16 dl_mdm_len1;	/*
209 				 * If this is 64, it can hold
210 				 * 60 bytes + 4 that is length field
211 				 */
212 	u16 dl_start;
213 
214 	u16 dl_diag_len1;
215 	u16 dl_mdm_len2;	/*
216 				 * If this is 64, it can hold
217 				 * 60 bytes + 4 that is length field
218 				 */
219 	u16 dl_app1_len;
220 
221 	u16 dl_diag_len2;
222 	u16 dl_ctrl_len;
223 	u16 dl_app2_len;
224 	u8 pad2[16];
225 	u16 ul_mdm_len1;
226 	u16 ul_start;
227 	u16 ul_diag_len;
228 	u16 ul_mdm_len2;
229 	u16 ul_app1_len;
230 	u16 ul_app2_len;
231 	u16 ul_ctrl_len;
232 } __attribute__ ((packed));
233 
234 /* This stores all control downlink flags */
235 struct ctrl_dl {
236 	u8 port;
237 	unsigned int reserved:4;
238 	unsigned int CTS:1;
239 	unsigned int RI:1;
240 	unsigned int DCD:1;
241 	unsigned int DSR:1;
242 } __attribute__ ((packed));
243 
244 /* This stores all control uplink flags */
245 struct ctrl_ul {
246 	u8 port;
247 	unsigned int reserved:6;
248 	unsigned int RTS:1;
249 	unsigned int DTR:1;
250 } __attribute__ ((packed));
251 
252 #else
253 /* Little endian */
254 
255 /* This represents the toggle information */
256 struct toggles {
257 	unsigned int mdm_ul:1;
258 	unsigned int mdm_dl:1;
259 	unsigned int diag_dl:1;
260 	unsigned int enabled:5;	/*
261 				 * Toggle fields are valid if enabled is 0,
262 				 * else A-channels must always be used.
263 				 */
264 } __attribute__ ((packed));
265 
266 /* Configuration table to read at startup of card */
267 struct config_table {
268 	u32 signature;
269 	u16 version;
270 	u16 product_information;
271 	struct toggles toggle;
272 	u8 pad1[7];
273 	u16 dl_start;
274 	u16 dl_mdm_len1;	/*
275 				 * If this is 64, it can hold
276 				 * 60 bytes + 4 that is length field
277 				 */
278 	u16 dl_mdm_len2;
279 	u16 dl_diag_len1;
280 	u16 dl_diag_len2;
281 	u16 dl_app1_len;
282 	u16 dl_app2_len;
283 	u16 dl_ctrl_len;
284 	u8 pad2[16];
285 	u16 ul_start;
286 	u16 ul_mdm_len2;
287 	u16 ul_mdm_len1;
288 	u16 ul_diag_len;
289 	u16 ul_app1_len;
290 	u16 ul_app2_len;
291 	u16 ul_ctrl_len;
292 } __attribute__ ((packed));
293 
294 /* This stores all control downlink flags */
295 struct ctrl_dl {
296 	unsigned int DSR:1;
297 	unsigned int DCD:1;
298 	unsigned int RI:1;
299 	unsigned int CTS:1;
300 	unsigned int reserved:4;
301 	u8 port;
302 } __attribute__ ((packed));
303 
304 /* This stores all control uplink flags */
305 struct ctrl_ul {
306 	unsigned int DTR:1;
307 	unsigned int RTS:1;
308 	unsigned int reserved:6;
309 	u8 port;
310 } __attribute__ ((packed));
311 #endif
312 
313 /* This holds all information that is needed regarding a port */
314 struct port {
315 	struct tty_port port;
316 	u8 update_flow_control;
317 	struct ctrl_ul ctrl_ul;
318 	struct ctrl_dl ctrl_dl;
319 	struct kfifo fifo_ul;
320 	void __iomem *dl_addr[2];
321 	u32 dl_size[2];
322 	u8 toggle_dl;
323 	void __iomem *ul_addr[2];
324 	u32 ul_size[2];
325 	u8 toggle_ul;
326 	u16 token_dl;
327 
328 	wait_queue_head_t tty_wait;
329 	struct async_icount tty_icount;
330 
331 	struct nozomi *dc;
332 };
333 
334 /* Private data one for each card in the system */
335 struct nozomi {
336 	void __iomem *base_addr;
337 	unsigned long flip;
338 
339 	/* Pointers to registers */
340 	void __iomem *reg_iir;
341 	void __iomem *reg_fcr;
342 	void __iomem *reg_ier;
343 
344 	u16 last_ier;
345 	enum card_type card_type;
346 	struct config_table config_table;	/* Configuration table */
347 	struct pci_dev *pdev;
348 	struct port port[NOZOMI_MAX_PORTS];
349 	u8 *send_buf;
350 
351 	spinlock_t spin_mutex;	/* secures access to registers and tty */
352 
353 	unsigned int index_start;
354 	enum card_state state;
355 	u32 open_ttys;
356 };
357 
358 /* Global variables */
359 static const struct pci_device_id nozomi_pci_tbl[] = {
360 	{PCI_DEVICE(0x1931, 0x000c)},	/* Nozomi HSDPA */
361 	{},
362 };
363 
364 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
365 
366 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
367 static struct tty_driver *ntty_driver;
368 
369 static const struct tty_port_operations noz_tty_port_ops;
370 
371 /*
372  * find card by tty_index
373  */
get_dc_by_tty(const struct tty_struct * tty)374 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
375 {
376 	return tty ? ndevs[tty->index / MAX_PORT] : NULL;
377 }
378 
get_port_by_tty(const struct tty_struct * tty)379 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
380 {
381 	struct nozomi *ndev = get_dc_by_tty(tty);
382 	return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
383 }
384 
385 /*
386  * TODO:
387  * -Optimize
388  * -Rewrite cleaner
389  */
390 
read_mem32(u32 * buf,const void __iomem * mem_addr_start,u32 size_bytes)391 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
392 			u32 size_bytes)
393 {
394 	u32 i = 0;
395 	const u32 __iomem *ptr = mem_addr_start;
396 	u16 *buf16;
397 
398 	if (unlikely(!ptr || !buf))
399 		goto out;
400 
401 	/* shortcut for extremely often used cases */
402 	switch (size_bytes) {
403 	case 2:	/* 2 bytes */
404 		buf16 = (u16 *) buf;
405 		*buf16 = __le16_to_cpu(readw(ptr));
406 		goto out;
407 	case 4:	/* 4 bytes */
408 		*(buf) = __le32_to_cpu(readl(ptr));
409 		goto out;
410 	}
411 
412 	while (i < size_bytes) {
413 		if (size_bytes - i == 2) {
414 			/* Handle 2 bytes in the end */
415 			buf16 = (u16 *) buf;
416 			*(buf16) = __le16_to_cpu(readw(ptr));
417 			i += 2;
418 		} else {
419 			/* Read 4 bytes */
420 			*(buf) = __le32_to_cpu(readl(ptr));
421 			i += 4;
422 		}
423 		buf++;
424 		ptr++;
425 	}
426 out:
427 	return;
428 }
429 
430 /*
431  * TODO:
432  * -Optimize
433  * -Rewrite cleaner
434  */
write_mem32(void __iomem * mem_addr_start,const u32 * buf,u32 size_bytes)435 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
436 			u32 size_bytes)
437 {
438 	u32 i = 0;
439 	u32 __iomem *ptr = mem_addr_start;
440 	const u16 *buf16;
441 
442 	if (unlikely(!ptr || !buf))
443 		return 0;
444 
445 	/* shortcut for extremely often used cases */
446 	switch (size_bytes) {
447 	case 2:	/* 2 bytes */
448 		buf16 = (const u16 *)buf;
449 		writew(__cpu_to_le16(*buf16), ptr);
450 		return 2;
451 	case 1: /*
452 		 * also needs to write 4 bytes in this case
453 		 * so falling through..
454 		 */
455 		fallthrough;
456 	case 4: /* 4 bytes */
457 		writel(__cpu_to_le32(*buf), ptr);
458 		return 4;
459 	}
460 
461 	while (i < size_bytes) {
462 		if (size_bytes - i == 2) {
463 			/* 2 bytes */
464 			buf16 = (const u16 *)buf;
465 			writew(__cpu_to_le16(*buf16), ptr);
466 			i += 2;
467 		} else {
468 			/* 4 bytes */
469 			writel(__cpu_to_le32(*buf), ptr);
470 			i += 4;
471 		}
472 		buf++;
473 		ptr++;
474 	}
475 	return i;
476 }
477 
478 /* Setup pointers to different channels and also setup buffer sizes. */
nozomi_setup_memory(struct nozomi * dc)479 static void nozomi_setup_memory(struct nozomi *dc)
480 {
481 	void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
482 	/* The length reported is including the length field of 4 bytes,
483 	 * hence subtract with 4.
484 	 */
485 	const u16 buff_offset = 4;
486 
487 	/* Modem port dl configuration */
488 	dc->port[PORT_MDM].dl_addr[CH_A] = offset;
489 	dc->port[PORT_MDM].dl_addr[CH_B] =
490 				(offset += dc->config_table.dl_mdm_len1);
491 	dc->port[PORT_MDM].dl_size[CH_A] =
492 				dc->config_table.dl_mdm_len1 - buff_offset;
493 	dc->port[PORT_MDM].dl_size[CH_B] =
494 				dc->config_table.dl_mdm_len2 - buff_offset;
495 
496 	/* Diag port dl configuration */
497 	dc->port[PORT_DIAG].dl_addr[CH_A] =
498 				(offset += dc->config_table.dl_mdm_len2);
499 	dc->port[PORT_DIAG].dl_size[CH_A] =
500 				dc->config_table.dl_diag_len1 - buff_offset;
501 	dc->port[PORT_DIAG].dl_addr[CH_B] =
502 				(offset += dc->config_table.dl_diag_len1);
503 	dc->port[PORT_DIAG].dl_size[CH_B] =
504 				dc->config_table.dl_diag_len2 - buff_offset;
505 
506 	/* App1 port dl configuration */
507 	dc->port[PORT_APP1].dl_addr[CH_A] =
508 				(offset += dc->config_table.dl_diag_len2);
509 	dc->port[PORT_APP1].dl_size[CH_A] =
510 				dc->config_table.dl_app1_len - buff_offset;
511 
512 	/* App2 port dl configuration */
513 	dc->port[PORT_APP2].dl_addr[CH_A] =
514 				(offset += dc->config_table.dl_app1_len);
515 	dc->port[PORT_APP2].dl_size[CH_A] =
516 				dc->config_table.dl_app2_len - buff_offset;
517 
518 	/* Ctrl dl configuration */
519 	dc->port[PORT_CTRL].dl_addr[CH_A] =
520 				(offset += dc->config_table.dl_app2_len);
521 	dc->port[PORT_CTRL].dl_size[CH_A] =
522 				dc->config_table.dl_ctrl_len - buff_offset;
523 
524 	offset = dc->base_addr + dc->config_table.ul_start;
525 
526 	/* Modem Port ul configuration */
527 	dc->port[PORT_MDM].ul_addr[CH_A] = offset;
528 	dc->port[PORT_MDM].ul_size[CH_A] =
529 				dc->config_table.ul_mdm_len1 - buff_offset;
530 	dc->port[PORT_MDM].ul_addr[CH_B] =
531 				(offset += dc->config_table.ul_mdm_len1);
532 	dc->port[PORT_MDM].ul_size[CH_B] =
533 				dc->config_table.ul_mdm_len2 - buff_offset;
534 
535 	/* Diag port ul configuration */
536 	dc->port[PORT_DIAG].ul_addr[CH_A] =
537 				(offset += dc->config_table.ul_mdm_len2);
538 	dc->port[PORT_DIAG].ul_size[CH_A] =
539 				dc->config_table.ul_diag_len - buff_offset;
540 
541 	/* App1 port ul configuration */
542 	dc->port[PORT_APP1].ul_addr[CH_A] =
543 				(offset += dc->config_table.ul_diag_len);
544 	dc->port[PORT_APP1].ul_size[CH_A] =
545 				dc->config_table.ul_app1_len - buff_offset;
546 
547 	/* App2 port ul configuration */
548 	dc->port[PORT_APP2].ul_addr[CH_A] =
549 				(offset += dc->config_table.ul_app1_len);
550 	dc->port[PORT_APP2].ul_size[CH_A] =
551 				dc->config_table.ul_app2_len - buff_offset;
552 
553 	/* Ctrl ul configuration */
554 	dc->port[PORT_CTRL].ul_addr[CH_A] =
555 				(offset += dc->config_table.ul_app2_len);
556 	dc->port[PORT_CTRL].ul_size[CH_A] =
557 				dc->config_table.ul_ctrl_len - buff_offset;
558 }
559 
560 /* Dump config table under initalization phase */
561 #ifdef DEBUG
dump_table(const struct nozomi * dc)562 static void dump_table(const struct nozomi *dc)
563 {
564 	DBG3("signature: 0x%08X", dc->config_table.signature);
565 	DBG3("version: 0x%04X", dc->config_table.version);
566 	DBG3("product_information: 0x%04X", \
567 				dc->config_table.product_information);
568 	DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
569 	DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
570 	DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
571 	DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
572 
573 	DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
574 	DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
575 	   dc->config_table.dl_mdm_len1);
576 	DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
577 	   dc->config_table.dl_mdm_len2);
578 	DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
579 	   dc->config_table.dl_diag_len1);
580 	DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
581 	   dc->config_table.dl_diag_len2);
582 	DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
583 	   dc->config_table.dl_app1_len);
584 	DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
585 	   dc->config_table.dl_app2_len);
586 	DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
587 	   dc->config_table.dl_ctrl_len);
588 	DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
589 	   dc->config_table.ul_start);
590 	DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
591 	   dc->config_table.ul_mdm_len1);
592 	DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
593 	   dc->config_table.ul_mdm_len2);
594 	DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
595 	   dc->config_table.ul_diag_len);
596 	DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
597 	   dc->config_table.ul_app1_len);
598 	DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
599 	   dc->config_table.ul_app2_len);
600 	DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
601 	   dc->config_table.ul_ctrl_len);
602 }
603 #else
dump_table(const struct nozomi * dc)604 static inline void dump_table(const struct nozomi *dc) { }
605 #endif
606 
607 /*
608  * Read configuration table from card under intalization phase
609  * Returns 1 if ok, else 0
610  */
nozomi_read_config_table(struct nozomi * dc)611 static int nozomi_read_config_table(struct nozomi *dc)
612 {
613 	read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
614 						sizeof(struct config_table));
615 
616 	if (dc->config_table.signature != NOZOMI_CONFIG_MAGIC) {
617 		dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
618 			dc->config_table.signature, NOZOMI_CONFIG_MAGIC);
619 		return 0;
620 	}
621 
622 	if ((dc->config_table.version == 0)
623 	    || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
624 		int i;
625 		DBG1("Second phase, configuring card");
626 
627 		nozomi_setup_memory(dc);
628 
629 		dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
630 		dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
631 		dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
632 		DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
633 		   dc->port[PORT_MDM].toggle_ul,
634 		   dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
635 
636 		dump_table(dc);
637 
638 		for (i = PORT_MDM; i < MAX_PORT; i++) {
639 			memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
640 			memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
641 		}
642 
643 		/* Enable control channel */
644 		dc->last_ier = dc->last_ier | CTRL_DL;
645 		writew(dc->last_ier, dc->reg_ier);
646 
647 		dc->state = NOZOMI_STATE_ALLOCATED;
648 		dev_info(&dc->pdev->dev, "Initialization OK!\n");
649 		return 1;
650 	}
651 
652 	if ((dc->config_table.version > 0)
653 	    && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
654 		u32 offset = 0;
655 		DBG1("First phase: pushing upload buffers, clearing download");
656 
657 		dev_info(&dc->pdev->dev, "Version of card: %d\n",
658 			 dc->config_table.version);
659 
660 		/* Here we should disable all I/O over F32. */
661 		nozomi_setup_memory(dc);
662 
663 		/*
664 		 * We should send ALL channel pair tokens back along
665 		 * with reset token
666 		 */
667 
668 		/* push upload modem buffers */
669 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
670 			(u32 *) &offset, 4);
671 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
672 			(u32 *) &offset, 4);
673 
674 		writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
675 
676 		DBG1("First phase done");
677 	}
678 
679 	return 1;
680 }
681 
682 /* Enable uplink interrupts  */
enable_transmit_ul(enum port_type port,struct nozomi * dc)683 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
684 {
685 	static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
686 
687 	if (port < NOZOMI_MAX_PORTS) {
688 		dc->last_ier |= mask[port];
689 		writew(dc->last_ier, dc->reg_ier);
690 	} else {
691 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
692 	}
693 }
694 
695 /* Disable uplink interrupts  */
disable_transmit_ul(enum port_type port,struct nozomi * dc)696 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
697 {
698 	static const u16 mask[] =
699 		{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
700 
701 	if (port < NOZOMI_MAX_PORTS) {
702 		dc->last_ier &= mask[port];
703 		writew(dc->last_ier, dc->reg_ier);
704 	} else {
705 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
706 	}
707 }
708 
709 /* Enable downlink interrupts */
enable_transmit_dl(enum port_type port,struct nozomi * dc)710 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
711 {
712 	static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
713 
714 	if (port < NOZOMI_MAX_PORTS) {
715 		dc->last_ier |= mask[port];
716 		writew(dc->last_ier, dc->reg_ier);
717 	} else {
718 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
719 	}
720 }
721 
722 /* Disable downlink interrupts */
disable_transmit_dl(enum port_type port,struct nozomi * dc)723 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
724 {
725 	static const u16 mask[] =
726 		{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
727 
728 	if (port < NOZOMI_MAX_PORTS) {
729 		dc->last_ier &= mask[port];
730 		writew(dc->last_ier, dc->reg_ier);
731 	} else {
732 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
733 	}
734 }
735 
736 /*
737  * Return 1 - send buffer to card and ack.
738  * Return 0 - don't ack, don't send buffer to card.
739  */
send_data(enum port_type index,struct nozomi * dc)740 static int send_data(enum port_type index, struct nozomi *dc)
741 {
742 	u32 size = 0;
743 	struct port *port = &dc->port[index];
744 	const u8 toggle = port->toggle_ul;
745 	void __iomem *addr = port->ul_addr[toggle];
746 	const u32 ul_size = port->ul_size[toggle];
747 
748 	/* Get data from tty and place in buf for now */
749 	size = kfifo_out(&port->fifo_ul, dc->send_buf,
750 			   ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
751 
752 	if (size == 0) {
753 		DBG4("No more data to send, disable link:");
754 		return 0;
755 	}
756 
757 	/* DUMP(buf, size); */
758 
759 	/* Write length + data */
760 	write_mem32(addr, (u32 *) &size, 4);
761 	write_mem32(addr + 4, (u32 *) dc->send_buf, size);
762 
763 	tty_port_tty_wakeup(&port->port);
764 
765 	return 1;
766 }
767 
768 /* If all data has been read, return 1, else 0 */
receive_data(enum port_type index,struct nozomi * dc)769 static int receive_data(enum port_type index, struct nozomi *dc)
770 {
771 	u8 buf[RECEIVE_BUF_MAX] = { 0 };
772 	int size;
773 	u32 offset = 4;
774 	struct port *port = &dc->port[index];
775 	void __iomem *addr = port->dl_addr[port->toggle_dl];
776 	struct tty_struct *tty = tty_port_tty_get(&port->port);
777 	int i, ret;
778 
779 	size = __le32_to_cpu(readl(addr));
780 
781 	if (tty && tty_throttled(tty)) {
782 		DBG1("No room in tty, don't read data, don't ack interrupt, "
783 			"disable interrupt");
784 
785 		/* disable interrupt in downlink... */
786 		disable_transmit_dl(index, dc);
787 		ret = 0;
788 		goto put;
789 	}
790 
791 	if (unlikely(size == 0)) {
792 		dev_err(&dc->pdev->dev, "size == 0?\n");
793 		ret = 1;
794 		goto put;
795 	}
796 
797 	while (size > 0) {
798 		read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
799 
800 		if (size == 1) {
801 			tty_insert_flip_char(&port->port, buf[0], TTY_NORMAL);
802 			size = 0;
803 		} else if (size < RECEIVE_BUF_MAX) {
804 			size -= tty_insert_flip_string(&port->port,
805 					(char *)buf, size);
806 		} else {
807 			i = tty_insert_flip_string(&port->port,
808 					(char *)buf, RECEIVE_BUF_MAX);
809 			size -= i;
810 			offset += i;
811 		}
812 	}
813 
814 	set_bit(index, &dc->flip);
815 	ret = 1;
816 put:
817 	tty_kref_put(tty);
818 	return ret;
819 }
820 
821 /* Debug for interrupts */
822 #ifdef DEBUG
interrupt2str(u16 interrupt)823 static char *interrupt2str(u16 interrupt)
824 {
825 	static char buf[TMP_BUF_MAX];
826 	char *p = buf;
827 
828 	if (interrupt & MDM_DL1)
829 		p += scnprintf(p, TMP_BUF_MAX, "MDM_DL1 ");
830 	if (interrupt & MDM_DL2)
831 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_DL2 ");
832 	if (interrupt & MDM_UL1)
833 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL1 ");
834 	if (interrupt & MDM_UL2)
835 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL2 ");
836 	if (interrupt & DIAG_DL1)
837 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL1 ");
838 	if (interrupt & DIAG_DL2)
839 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL2 ");
840 
841 	if (interrupt & DIAG_UL)
842 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_UL ");
843 
844 	if (interrupt & APP1_DL)
845 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_DL ");
846 	if (interrupt & APP2_DL)
847 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_DL ");
848 
849 	if (interrupt & APP1_UL)
850 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_UL ");
851 	if (interrupt & APP2_UL)
852 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_UL ");
853 
854 	if (interrupt & CTRL_DL)
855 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_DL ");
856 	if (interrupt & CTRL_UL)
857 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_UL ");
858 
859 	if (interrupt & RESET)
860 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "RESET ");
861 
862 	return buf;
863 }
864 #endif
865 
866 /*
867  * Receive flow control
868  * Return 1 - If ok, else 0
869  */
receive_flow_control(struct nozomi * dc)870 static int receive_flow_control(struct nozomi *dc)
871 {
872 	enum port_type port = PORT_MDM;
873 	struct ctrl_dl ctrl_dl;
874 	struct ctrl_dl old_ctrl;
875 	u16 enable_ier = 0;
876 
877 	read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
878 
879 	switch (ctrl_dl.port) {
880 	case CTRL_CMD:
881 		DBG1("The Base Band sends this value as a response to a "
882 			"request for IMSI detach sent over the control "
883 			"channel uplink (see section 7.6.1).");
884 		break;
885 	case CTRL_MDM:
886 		port = PORT_MDM;
887 		enable_ier = MDM_DL;
888 		break;
889 	case CTRL_DIAG:
890 		port = PORT_DIAG;
891 		enable_ier = DIAG_DL;
892 		break;
893 	case CTRL_APP1:
894 		port = PORT_APP1;
895 		enable_ier = APP1_DL;
896 		break;
897 	case CTRL_APP2:
898 		port = PORT_APP2;
899 		enable_ier = APP2_DL;
900 		if (dc->state == NOZOMI_STATE_ALLOCATED) {
901 			/*
902 			 * After card initialization the flow control
903 			 * received for APP2 is always the last
904 			 */
905 			dc->state = NOZOMI_STATE_READY;
906 			dev_info(&dc->pdev->dev, "Device READY!\n");
907 		}
908 		break;
909 	default:
910 		dev_err(&dc->pdev->dev,
911 			"ERROR: flow control received for non-existing port\n");
912 		return 0;
913 	}
914 
915 	DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
916 	   *((u16 *)&ctrl_dl));
917 
918 	old_ctrl = dc->port[port].ctrl_dl;
919 	dc->port[port].ctrl_dl = ctrl_dl;
920 
921 	if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
922 		DBG1("Disable interrupt (0x%04X) on port: %d",
923 			enable_ier, port);
924 		disable_transmit_ul(port, dc);
925 
926 	} else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
927 
928 		if (kfifo_len(&dc->port[port].fifo_ul)) {
929 			DBG1("Enable interrupt (0x%04X) on port: %d",
930 				enable_ier, port);
931 			DBG1("Data in buffer [%d], enable transmit! ",
932 				kfifo_len(&dc->port[port].fifo_ul));
933 			enable_transmit_ul(port, dc);
934 		} else {
935 			DBG1("No data in buffer...");
936 		}
937 	}
938 
939 	if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
940 		DBG1(" No change in mctrl");
941 		return 1;
942 	}
943 	/* Update statistics */
944 	if (old_ctrl.CTS != ctrl_dl.CTS)
945 		dc->port[port].tty_icount.cts++;
946 	if (old_ctrl.DSR != ctrl_dl.DSR)
947 		dc->port[port].tty_icount.dsr++;
948 	if (old_ctrl.RI != ctrl_dl.RI)
949 		dc->port[port].tty_icount.rng++;
950 	if (old_ctrl.DCD != ctrl_dl.DCD)
951 		dc->port[port].tty_icount.dcd++;
952 
953 	wake_up_interruptible(&dc->port[port].tty_wait);
954 
955 	DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
956 	   port,
957 	   dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
958 	   dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
959 
960 	return 1;
961 }
962 
port2ctrl(enum port_type port,const struct nozomi * dc)963 static enum ctrl_port_type port2ctrl(enum port_type port,
964 					const struct nozomi *dc)
965 {
966 	switch (port) {
967 	case PORT_MDM:
968 		return CTRL_MDM;
969 	case PORT_DIAG:
970 		return CTRL_DIAG;
971 	case PORT_APP1:
972 		return CTRL_APP1;
973 	case PORT_APP2:
974 		return CTRL_APP2;
975 	default:
976 		dev_err(&dc->pdev->dev,
977 			"ERROR: send flow control " \
978 			"received for non-existing port\n");
979 	}
980 	return CTRL_ERROR;
981 }
982 
983 /*
984  * Send flow control, can only update one channel at a time
985  * Return 0 - If we have updated all flow control
986  * Return 1 - If we need to update more flow control, ack current enable more
987  */
send_flow_control(struct nozomi * dc)988 static int send_flow_control(struct nozomi *dc)
989 {
990 	u32 i, more_flow_control_to_be_updated = 0;
991 	u16 *ctrl;
992 
993 	for (i = PORT_MDM; i < MAX_PORT; i++) {
994 		if (dc->port[i].update_flow_control) {
995 			if (more_flow_control_to_be_updated) {
996 				/* We have more flow control to be updated */
997 				return 1;
998 			}
999 			dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1000 			ctrl = (u16 *)&dc->port[i].ctrl_ul;
1001 			write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1002 				(u32 *) ctrl, 2);
1003 			dc->port[i].update_flow_control = 0;
1004 			more_flow_control_to_be_updated = 1;
1005 		}
1006 	}
1007 	return 0;
1008 }
1009 
1010 /*
1011  * Handle downlink data, ports that are handled are modem and diagnostics
1012  * Return 1 - ok
1013  * Return 0 - toggle fields are out of sync
1014  */
handle_data_dl(struct nozomi * dc,enum port_type port,u8 * toggle,u16 read_iir,u16 mask1,u16 mask2)1015 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1016 			u16 read_iir, u16 mask1, u16 mask2)
1017 {
1018 	if (*toggle == 0 && read_iir & mask1) {
1019 		if (receive_data(port, dc)) {
1020 			writew(mask1, dc->reg_fcr);
1021 			*toggle = !(*toggle);
1022 		}
1023 
1024 		if (read_iir & mask2) {
1025 			if (receive_data(port, dc)) {
1026 				writew(mask2, dc->reg_fcr);
1027 				*toggle = !(*toggle);
1028 			}
1029 		}
1030 	} else if (*toggle == 1 && read_iir & mask2) {
1031 		if (receive_data(port, dc)) {
1032 			writew(mask2, dc->reg_fcr);
1033 			*toggle = !(*toggle);
1034 		}
1035 
1036 		if (read_iir & mask1) {
1037 			if (receive_data(port, dc)) {
1038 				writew(mask1, dc->reg_fcr);
1039 				*toggle = !(*toggle);
1040 			}
1041 		}
1042 	} else {
1043 		dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1044 			*toggle);
1045 		return 0;
1046 	}
1047 	return 1;
1048 }
1049 
1050 /*
1051  * Handle uplink data, this is currently for the modem port
1052  * Return 1 - ok
1053  * Return 0 - toggle field are out of sync
1054  */
handle_data_ul(struct nozomi * dc,enum port_type port,u16 read_iir)1055 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1056 {
1057 	u8 *toggle = &(dc->port[port].toggle_ul);
1058 
1059 	if (*toggle == 0 && read_iir & MDM_UL1) {
1060 		dc->last_ier &= ~MDM_UL;
1061 		writew(dc->last_ier, dc->reg_ier);
1062 		if (send_data(port, dc)) {
1063 			writew(MDM_UL1, dc->reg_fcr);
1064 			dc->last_ier = dc->last_ier | MDM_UL;
1065 			writew(dc->last_ier, dc->reg_ier);
1066 			*toggle = !*toggle;
1067 		}
1068 
1069 		if (read_iir & MDM_UL2) {
1070 			dc->last_ier &= ~MDM_UL;
1071 			writew(dc->last_ier, dc->reg_ier);
1072 			if (send_data(port, dc)) {
1073 				writew(MDM_UL2, dc->reg_fcr);
1074 				dc->last_ier = dc->last_ier | MDM_UL;
1075 				writew(dc->last_ier, dc->reg_ier);
1076 				*toggle = !*toggle;
1077 			}
1078 		}
1079 
1080 	} else if (*toggle == 1 && read_iir & MDM_UL2) {
1081 		dc->last_ier &= ~MDM_UL;
1082 		writew(dc->last_ier, dc->reg_ier);
1083 		if (send_data(port, dc)) {
1084 			writew(MDM_UL2, dc->reg_fcr);
1085 			dc->last_ier = dc->last_ier | MDM_UL;
1086 			writew(dc->last_ier, dc->reg_ier);
1087 			*toggle = !*toggle;
1088 		}
1089 
1090 		if (read_iir & MDM_UL1) {
1091 			dc->last_ier &= ~MDM_UL;
1092 			writew(dc->last_ier, dc->reg_ier);
1093 			if (send_data(port, dc)) {
1094 				writew(MDM_UL1, dc->reg_fcr);
1095 				dc->last_ier = dc->last_ier | MDM_UL;
1096 				writew(dc->last_ier, dc->reg_ier);
1097 				*toggle = !*toggle;
1098 			}
1099 		}
1100 	} else {
1101 		writew(read_iir & MDM_UL, dc->reg_fcr);
1102 		dev_err(&dc->pdev->dev, "port out of sync!\n");
1103 		return 0;
1104 	}
1105 	return 1;
1106 }
1107 
interrupt_handler(int irq,void * dev_id)1108 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1109 {
1110 	struct nozomi *dc = dev_id;
1111 	unsigned int a;
1112 	u16 read_iir;
1113 
1114 	if (!dc)
1115 		return IRQ_NONE;
1116 
1117 	spin_lock(&dc->spin_mutex);
1118 	read_iir = readw(dc->reg_iir);
1119 
1120 	/* Card removed */
1121 	if (read_iir == (u16)-1)
1122 		goto none;
1123 	/*
1124 	 * Just handle interrupt enabled in IER
1125 	 * (by masking with dc->last_ier)
1126 	 */
1127 	read_iir &= dc->last_ier;
1128 
1129 	if (read_iir == 0)
1130 		goto none;
1131 
1132 
1133 	DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1134 		dc->last_ier);
1135 
1136 	if (read_iir & RESET) {
1137 		if (unlikely(!nozomi_read_config_table(dc))) {
1138 			dc->last_ier = 0x0;
1139 			writew(dc->last_ier, dc->reg_ier);
1140 			dev_err(&dc->pdev->dev, "Could not read status from "
1141 				"card, we should disable interface\n");
1142 		} else {
1143 			writew(RESET, dc->reg_fcr);
1144 		}
1145 		/* No more useful info if this was the reset interrupt. */
1146 		goto exit_handler;
1147 	}
1148 	if (read_iir & CTRL_UL) {
1149 		DBG1("CTRL_UL");
1150 		dc->last_ier &= ~CTRL_UL;
1151 		writew(dc->last_ier, dc->reg_ier);
1152 		if (send_flow_control(dc)) {
1153 			writew(CTRL_UL, dc->reg_fcr);
1154 			dc->last_ier = dc->last_ier | CTRL_UL;
1155 			writew(dc->last_ier, dc->reg_ier);
1156 		}
1157 	}
1158 	if (read_iir & CTRL_DL) {
1159 		receive_flow_control(dc);
1160 		writew(CTRL_DL, dc->reg_fcr);
1161 	}
1162 	if (read_iir & MDM_DL) {
1163 		if (!handle_data_dl(dc, PORT_MDM,
1164 				&(dc->port[PORT_MDM].toggle_dl), read_iir,
1165 				MDM_DL1, MDM_DL2)) {
1166 			dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1167 			goto exit_handler;
1168 		}
1169 	}
1170 	if (read_iir & MDM_UL) {
1171 		if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1172 			dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1173 			goto exit_handler;
1174 		}
1175 	}
1176 	if (read_iir & DIAG_DL) {
1177 		if (!handle_data_dl(dc, PORT_DIAG,
1178 				&(dc->port[PORT_DIAG].toggle_dl), read_iir,
1179 				DIAG_DL1, DIAG_DL2)) {
1180 			dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1181 			goto exit_handler;
1182 		}
1183 	}
1184 	if (read_iir & DIAG_UL) {
1185 		dc->last_ier &= ~DIAG_UL;
1186 		writew(dc->last_ier, dc->reg_ier);
1187 		if (send_data(PORT_DIAG, dc)) {
1188 			writew(DIAG_UL, dc->reg_fcr);
1189 			dc->last_ier = dc->last_ier | DIAG_UL;
1190 			writew(dc->last_ier, dc->reg_ier);
1191 		}
1192 	}
1193 	if (read_iir & APP1_DL) {
1194 		if (receive_data(PORT_APP1, dc))
1195 			writew(APP1_DL, dc->reg_fcr);
1196 	}
1197 	if (read_iir & APP1_UL) {
1198 		dc->last_ier &= ~APP1_UL;
1199 		writew(dc->last_ier, dc->reg_ier);
1200 		if (send_data(PORT_APP1, dc)) {
1201 			writew(APP1_UL, dc->reg_fcr);
1202 			dc->last_ier = dc->last_ier | APP1_UL;
1203 			writew(dc->last_ier, dc->reg_ier);
1204 		}
1205 	}
1206 	if (read_iir & APP2_DL) {
1207 		if (receive_data(PORT_APP2, dc))
1208 			writew(APP2_DL, dc->reg_fcr);
1209 	}
1210 	if (read_iir & APP2_UL) {
1211 		dc->last_ier &= ~APP2_UL;
1212 		writew(dc->last_ier, dc->reg_ier);
1213 		if (send_data(PORT_APP2, dc)) {
1214 			writew(APP2_UL, dc->reg_fcr);
1215 			dc->last_ier = dc->last_ier | APP2_UL;
1216 			writew(dc->last_ier, dc->reg_ier);
1217 		}
1218 	}
1219 
1220 exit_handler:
1221 	spin_unlock(&dc->spin_mutex);
1222 
1223 	for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1224 		if (test_and_clear_bit(a, &dc->flip))
1225 			tty_flip_buffer_push(&dc->port[a].port);
1226 
1227 	return IRQ_HANDLED;
1228 none:
1229 	spin_unlock(&dc->spin_mutex);
1230 	return IRQ_NONE;
1231 }
1232 
nozomi_get_card_type(struct nozomi * dc)1233 static void nozomi_get_card_type(struct nozomi *dc)
1234 {
1235 	int i;
1236 	u32 size = 0;
1237 
1238 	for (i = 0; i < 6; i++)
1239 		size += pci_resource_len(dc->pdev, i);
1240 
1241 	/* Assume card type F32_8 if no match */
1242 	dc->card_type = size == 2048 ? F32_2 : F32_8;
1243 
1244 	dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1245 }
1246 
nozomi_setup_private_data(struct nozomi * dc)1247 static void nozomi_setup_private_data(struct nozomi *dc)
1248 {
1249 	void __iomem *offset = dc->base_addr + dc->card_type / 2;
1250 	unsigned int i;
1251 
1252 	dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1253 	dc->reg_iir = (void __iomem *)(offset + R_IIR);
1254 	dc->reg_ier = (void __iomem *)(offset + R_IER);
1255 	dc->last_ier = 0;
1256 	dc->flip = 0;
1257 
1258 	dc->port[PORT_MDM].token_dl = MDM_DL;
1259 	dc->port[PORT_DIAG].token_dl = DIAG_DL;
1260 	dc->port[PORT_APP1].token_dl = APP1_DL;
1261 	dc->port[PORT_APP2].token_dl = APP2_DL;
1262 
1263 	for (i = 0; i < MAX_PORT; i++)
1264 		init_waitqueue_head(&dc->port[i].tty_wait);
1265 }
1266 
card_type_show(struct device * dev,struct device_attribute * attr,char * buf)1267 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1268 			  char *buf)
1269 {
1270 	const struct nozomi *dc = dev_get_drvdata(dev);
1271 
1272 	return sprintf(buf, "%d\n", dc->card_type);
1273 }
1274 static DEVICE_ATTR_RO(card_type);
1275 
open_ttys_show(struct device * dev,struct device_attribute * attr,char * buf)1276 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1277 			  char *buf)
1278 {
1279 	const struct nozomi *dc = dev_get_drvdata(dev);
1280 
1281 	return sprintf(buf, "%u\n", dc->open_ttys);
1282 }
1283 static DEVICE_ATTR_RO(open_ttys);
1284 
make_sysfs_files(struct nozomi * dc)1285 static void make_sysfs_files(struct nozomi *dc)
1286 {
1287 	if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1288 		dev_err(&dc->pdev->dev,
1289 			"Could not create sysfs file for card_type\n");
1290 	if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1291 		dev_err(&dc->pdev->dev,
1292 			"Could not create sysfs file for open_ttys\n");
1293 }
1294 
remove_sysfs_files(struct nozomi * dc)1295 static void remove_sysfs_files(struct nozomi *dc)
1296 {
1297 	device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1298 	device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1299 }
1300 
1301 /* Allocate memory for one device */
nozomi_card_init(struct pci_dev * pdev,const struct pci_device_id * ent)1302 static int nozomi_card_init(struct pci_dev *pdev,
1303 				      const struct pci_device_id *ent)
1304 {
1305 	int ret;
1306 	struct nozomi *dc = NULL;
1307 	int ndev_idx;
1308 	int i;
1309 
1310 	for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1311 		if (!ndevs[ndev_idx])
1312 			break;
1313 
1314 	if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1315 		dev_err(&pdev->dev, "no free tty range for this card left\n");
1316 		ret = -EIO;
1317 		goto err;
1318 	}
1319 
1320 	dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1321 	if (unlikely(!dc)) {
1322 		dev_err(&pdev->dev, "Could not allocate memory\n");
1323 		ret = -ENOMEM;
1324 		goto err_free;
1325 	}
1326 
1327 	dc->pdev = pdev;
1328 
1329 	ret = pci_enable_device(dc->pdev);
1330 	if (ret) {
1331 		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1332 		goto err_free;
1333 	}
1334 
1335 	ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1336 	if (ret) {
1337 		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1338 			(int) /* nozomi_private.io_addr */ 0);
1339 		goto err_disable_device;
1340 	}
1341 
1342 	/* Find out what card type it is */
1343 	nozomi_get_card_type(dc);
1344 
1345 	dc->base_addr = pci_iomap(dc->pdev, 0, dc->card_type);
1346 	if (!dc->base_addr) {
1347 		dev_err(&pdev->dev, "Unable to map card MMIO\n");
1348 		ret = -ENODEV;
1349 		goto err_rel_regs;
1350 	}
1351 
1352 	dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1353 	if (!dc->send_buf) {
1354 		dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1355 		ret = -ENOMEM;
1356 		goto err_free_sbuf;
1357 	}
1358 
1359 	for (i = PORT_MDM; i < MAX_PORT; i++) {
1360 		if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1361 					GFP_KERNEL)) {
1362 			dev_err(&pdev->dev,
1363 					"Could not allocate kfifo buffer\n");
1364 			ret = -ENOMEM;
1365 			goto err_free_kfifo;
1366 		}
1367 	}
1368 
1369 	spin_lock_init(&dc->spin_mutex);
1370 
1371 	nozomi_setup_private_data(dc);
1372 
1373 	/* Disable all interrupts */
1374 	dc->last_ier = 0;
1375 	writew(dc->last_ier, dc->reg_ier);
1376 
1377 	ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1378 			NOZOMI_NAME, dc);
1379 	if (unlikely(ret)) {
1380 		dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1381 		goto err_free_all_kfifo;
1382 	}
1383 
1384 	DBG1("base_addr: %p", dc->base_addr);
1385 
1386 	make_sysfs_files(dc);
1387 
1388 	dc->index_start = ndev_idx * MAX_PORT;
1389 	ndevs[ndev_idx] = dc;
1390 
1391 	pci_set_drvdata(pdev, dc);
1392 
1393 	/* Enable RESET interrupt */
1394 	dc->last_ier = RESET;
1395 	iowrite16(dc->last_ier, dc->reg_ier);
1396 
1397 	dc->state = NOZOMI_STATE_ENABLED;
1398 
1399 	for (i = 0; i < MAX_PORT; i++) {
1400 		struct device *tty_dev;
1401 		struct port *port = &dc->port[i];
1402 		port->dc = dc;
1403 		tty_port_init(&port->port);
1404 		port->port.ops = &noz_tty_port_ops;
1405 		tty_dev = tty_port_register_device(&port->port, ntty_driver,
1406 				dc->index_start + i, &pdev->dev);
1407 
1408 		if (IS_ERR(tty_dev)) {
1409 			ret = PTR_ERR(tty_dev);
1410 			dev_err(&pdev->dev, "Could not allocate tty?\n");
1411 			tty_port_destroy(&port->port);
1412 			goto err_free_tty;
1413 		}
1414 	}
1415 
1416 	return 0;
1417 
1418 err_free_tty:
1419 	for (i--; i >= 0; i--) {
1420 		tty_unregister_device(ntty_driver, dc->index_start + i);
1421 		tty_port_destroy(&dc->port[i].port);
1422 	}
1423 	free_irq(pdev->irq, dc);
1424 err_free_all_kfifo:
1425 	i = MAX_PORT;
1426 err_free_kfifo:
1427 	for (i--; i >= PORT_MDM; i--)
1428 		kfifo_free(&dc->port[i].fifo_ul);
1429 err_free_sbuf:
1430 	kfree(dc->send_buf);
1431 	iounmap(dc->base_addr);
1432 err_rel_regs:
1433 	pci_release_regions(pdev);
1434 err_disable_device:
1435 	pci_disable_device(pdev);
1436 err_free:
1437 	kfree(dc);
1438 err:
1439 	return ret;
1440 }
1441 
tty_exit(struct nozomi * dc)1442 static void tty_exit(struct nozomi *dc)
1443 {
1444 	unsigned int i;
1445 
1446 	for (i = 0; i < MAX_PORT; ++i)
1447 		tty_port_tty_hangup(&dc->port[i].port, false);
1448 
1449 	/* Racy below - surely should wait for scheduled work to be done or
1450 	   complete off a hangup method ? */
1451 	while (dc->open_ttys)
1452 		msleep(1);
1453 	for (i = 0; i < MAX_PORT; ++i) {
1454 		tty_unregister_device(ntty_driver, dc->index_start + i);
1455 		tty_port_destroy(&dc->port[i].port);
1456 	}
1457 }
1458 
1459 /* Deallocate memory for one device */
nozomi_card_exit(struct pci_dev * pdev)1460 static void nozomi_card_exit(struct pci_dev *pdev)
1461 {
1462 	int i;
1463 	struct ctrl_ul ctrl;
1464 	struct nozomi *dc = pci_get_drvdata(pdev);
1465 
1466 	/* Disable all interrupts */
1467 	dc->last_ier = 0;
1468 	writew(dc->last_ier, dc->reg_ier);
1469 
1470 	tty_exit(dc);
1471 
1472 	/* Send 0x0001, command card to resend the reset token.  */
1473 	/* This is to get the reset when the module is reloaded. */
1474 	ctrl.port = 0x00;
1475 	ctrl.reserved = 0;
1476 	ctrl.RTS = 0;
1477 	ctrl.DTR = 1;
1478 	DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1479 
1480 	/* Setup dc->reg addresses to we can use defines here */
1481 	write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1482 	writew(CTRL_UL, dc->reg_fcr);	/* push the token to the card. */
1483 
1484 	remove_sysfs_files(dc);
1485 
1486 	free_irq(pdev->irq, dc);
1487 
1488 	for (i = 0; i < MAX_PORT; i++)
1489 		kfifo_free(&dc->port[i].fifo_ul);
1490 
1491 	kfree(dc->send_buf);
1492 
1493 	iounmap(dc->base_addr);
1494 
1495 	pci_release_regions(pdev);
1496 
1497 	pci_disable_device(pdev);
1498 
1499 	ndevs[dc->index_start / MAX_PORT] = NULL;
1500 
1501 	kfree(dc);
1502 }
1503 
set_rts(const struct tty_struct * tty,int rts)1504 static void set_rts(const struct tty_struct *tty, int rts)
1505 {
1506 	struct port *port = get_port_by_tty(tty);
1507 
1508 	port->ctrl_ul.RTS = rts;
1509 	port->update_flow_control = 1;
1510 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1511 }
1512 
set_dtr(const struct tty_struct * tty,int dtr)1513 static void set_dtr(const struct tty_struct *tty, int dtr)
1514 {
1515 	struct port *port = get_port_by_tty(tty);
1516 
1517 	DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1518 
1519 	port->ctrl_ul.DTR = dtr;
1520 	port->update_flow_control = 1;
1521 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1522 }
1523 
1524 /*
1525  * ----------------------------------------------------------------------------
1526  * TTY code
1527  * ----------------------------------------------------------------------------
1528  */
1529 
ntty_install(struct tty_driver * driver,struct tty_struct * tty)1530 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1531 {
1532 	struct port *port = get_port_by_tty(tty);
1533 	struct nozomi *dc = get_dc_by_tty(tty);
1534 	int ret;
1535 	if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1536 		return -ENODEV;
1537 	ret = tty_standard_install(driver, tty);
1538 	if (ret == 0)
1539 		tty->driver_data = port;
1540 	return ret;
1541 }
1542 
ntty_cleanup(struct tty_struct * tty)1543 static void ntty_cleanup(struct tty_struct *tty)
1544 {
1545 	tty->driver_data = NULL;
1546 }
1547 
ntty_activate(struct tty_port * tport,struct tty_struct * tty)1548 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1549 {
1550 	struct port *port = container_of(tport, struct port, port);
1551 	struct nozomi *dc = port->dc;
1552 	unsigned long flags;
1553 
1554 	DBG1("open: %d", port->token_dl);
1555 	spin_lock_irqsave(&dc->spin_mutex, flags);
1556 	dc->last_ier = dc->last_ier | port->token_dl;
1557 	writew(dc->last_ier, dc->reg_ier);
1558 	dc->open_ttys++;
1559 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1560 	printk("noz: activated %d: %p\n", tty->index, tport);
1561 	return 0;
1562 }
1563 
ntty_open(struct tty_struct * tty,struct file * filp)1564 static int ntty_open(struct tty_struct *tty, struct file *filp)
1565 {
1566 	struct port *port = tty->driver_data;
1567 	return tty_port_open(&port->port, tty, filp);
1568 }
1569 
ntty_shutdown(struct tty_port * tport)1570 static void ntty_shutdown(struct tty_port *tport)
1571 {
1572 	struct port *port = container_of(tport, struct port, port);
1573 	struct nozomi *dc = port->dc;
1574 	unsigned long flags;
1575 
1576 	DBG1("close: %d", port->token_dl);
1577 	spin_lock_irqsave(&dc->spin_mutex, flags);
1578 	dc->last_ier &= ~(port->token_dl);
1579 	writew(dc->last_ier, dc->reg_ier);
1580 	dc->open_ttys--;
1581 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1582 	printk("noz: shutdown %p\n", tport);
1583 }
1584 
ntty_close(struct tty_struct * tty,struct file * filp)1585 static void ntty_close(struct tty_struct *tty, struct file *filp)
1586 {
1587 	struct port *port = tty->driver_data;
1588 	if (port)
1589 		tty_port_close(&port->port, tty, filp);
1590 }
1591 
ntty_hangup(struct tty_struct * tty)1592 static void ntty_hangup(struct tty_struct *tty)
1593 {
1594 	struct port *port = tty->driver_data;
1595 	tty_port_hangup(&port->port);
1596 }
1597 
1598 /*
1599  * called when the userspace process writes to the tty (/dev/noz*).
1600  * Data is inserted into a fifo, which is then read and transferred to the modem.
1601  */
ntty_write(struct tty_struct * tty,const unsigned char * buffer,int count)1602 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1603 		      int count)
1604 {
1605 	int rval = -EINVAL;
1606 	struct nozomi *dc = get_dc_by_tty(tty);
1607 	struct port *port = tty->driver_data;
1608 	unsigned long flags;
1609 
1610 	if (!dc || !port)
1611 		return -ENODEV;
1612 
1613 	rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1614 
1615 	spin_lock_irqsave(&dc->spin_mutex, flags);
1616 	/* CTS is only valid on the modem channel */
1617 	if (port == &(dc->port[PORT_MDM])) {
1618 		if (port->ctrl_dl.CTS) {
1619 			DBG4("Enable interrupt");
1620 			enable_transmit_ul(tty->index % MAX_PORT, dc);
1621 		} else {
1622 			dev_err(&dc->pdev->dev,
1623 				"CTS not active on modem port?\n");
1624 		}
1625 	} else {
1626 		enable_transmit_ul(tty->index % MAX_PORT, dc);
1627 	}
1628 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1629 
1630 	return rval;
1631 }
1632 
1633 /*
1634  * Calculate how much is left in device
1635  * This method is called by the upper tty layer.
1636  *   #according to sources N_TTY.c it expects a value >= 0 and
1637  *    does not check for negative values.
1638  *
1639  * If the port is unplugged report lots of room and let the bits
1640  * dribble away so we don't block anything.
1641  */
ntty_write_room(struct tty_struct * tty)1642 static unsigned int ntty_write_room(struct tty_struct *tty)
1643 {
1644 	struct port *port = tty->driver_data;
1645 	unsigned int room = 4096;
1646 	const struct nozomi *dc = get_dc_by_tty(tty);
1647 
1648 	if (dc)
1649 		room = kfifo_avail(&port->fifo_ul);
1650 
1651 	return room;
1652 }
1653 
1654 /* Gets io control parameters */
ntty_tiocmget(struct tty_struct * tty)1655 static int ntty_tiocmget(struct tty_struct *tty)
1656 {
1657 	const struct port *port = tty->driver_data;
1658 	const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1659 	const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1660 
1661 	/* Note: these could change under us but it is not clear this
1662 	   matters if so */
1663 	return (ctrl_ul->RTS ? TIOCM_RTS : 0)
1664 		| (ctrl_ul->DTR ? TIOCM_DTR : 0)
1665 		| (ctrl_dl->DCD ? TIOCM_CAR : 0)
1666 		| (ctrl_dl->RI  ? TIOCM_RNG : 0)
1667 		| (ctrl_dl->DSR ? TIOCM_DSR : 0)
1668 		| (ctrl_dl->CTS ? TIOCM_CTS : 0);
1669 }
1670 
1671 /* Sets io controls parameters */
ntty_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1672 static int ntty_tiocmset(struct tty_struct *tty,
1673 					unsigned int set, unsigned int clear)
1674 {
1675 	struct nozomi *dc = get_dc_by_tty(tty);
1676 	unsigned long flags;
1677 
1678 	spin_lock_irqsave(&dc->spin_mutex, flags);
1679 	if (set & TIOCM_RTS)
1680 		set_rts(tty, 1);
1681 	else if (clear & TIOCM_RTS)
1682 		set_rts(tty, 0);
1683 
1684 	if (set & TIOCM_DTR)
1685 		set_dtr(tty, 1);
1686 	else if (clear & TIOCM_DTR)
1687 		set_dtr(tty, 0);
1688 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1689 
1690 	return 0;
1691 }
1692 
ntty_cflags_changed(struct port * port,unsigned long flags,struct async_icount * cprev)1693 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1694 		struct async_icount *cprev)
1695 {
1696 	const struct async_icount cnow = port->tty_icount;
1697 	int ret;
1698 
1699 	ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng))
1700 		|| ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr))
1701 		|| ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd))
1702 		|| ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1703 
1704 	*cprev = cnow;
1705 
1706 	return ret;
1707 }
1708 
ntty_tiocgicount(struct tty_struct * tty,struct serial_icounter_struct * icount)1709 static int ntty_tiocgicount(struct tty_struct *tty,
1710 				struct serial_icounter_struct *icount)
1711 {
1712 	struct port *port = tty->driver_data;
1713 	const struct async_icount cnow = port->tty_icount;
1714 
1715 	icount->cts = cnow.cts;
1716 	icount->dsr = cnow.dsr;
1717 	icount->rng = cnow.rng;
1718 	icount->dcd = cnow.dcd;
1719 	icount->rx = cnow.rx;
1720 	icount->tx = cnow.tx;
1721 	icount->frame = cnow.frame;
1722 	icount->overrun = cnow.overrun;
1723 	icount->parity = cnow.parity;
1724 	icount->brk = cnow.brk;
1725 	icount->buf_overrun = cnow.buf_overrun;
1726 	return 0;
1727 }
1728 
ntty_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1729 static int ntty_ioctl(struct tty_struct *tty,
1730 		      unsigned int cmd, unsigned long arg)
1731 {
1732 	struct port *port = tty->driver_data;
1733 	int rval = -ENOIOCTLCMD;
1734 
1735 	switch (cmd) {
1736 	case TIOCMIWAIT: {
1737 		struct async_icount cprev = port->tty_icount;
1738 
1739 		rval = wait_event_interruptible(port->tty_wait,
1740 				ntty_cflags_changed(port, arg, &cprev));
1741 		break;
1742 	}
1743 	default:
1744 		DBG1("ERR: 0x%08X, %d", cmd, cmd);
1745 		break;
1746 	}
1747 
1748 	return rval;
1749 }
1750 
1751 /*
1752  * Called by the upper tty layer when tty buffers are ready
1753  * to receive data again after a call to throttle.
1754  */
ntty_unthrottle(struct tty_struct * tty)1755 static void ntty_unthrottle(struct tty_struct *tty)
1756 {
1757 	struct nozomi *dc = get_dc_by_tty(tty);
1758 	unsigned long flags;
1759 
1760 	spin_lock_irqsave(&dc->spin_mutex, flags);
1761 	enable_transmit_dl(tty->index % MAX_PORT, dc);
1762 	set_rts(tty, 1);
1763 
1764 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1765 }
1766 
1767 /*
1768  * Called by the upper tty layer when the tty buffers are almost full.
1769  * The driver should stop send more data.
1770  */
ntty_throttle(struct tty_struct * tty)1771 static void ntty_throttle(struct tty_struct *tty)
1772 {
1773 	struct nozomi *dc = get_dc_by_tty(tty);
1774 	unsigned long flags;
1775 
1776 	spin_lock_irqsave(&dc->spin_mutex, flags);
1777 	set_rts(tty, 0);
1778 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1779 }
1780 
1781 /* Returns number of chars in buffer, called by tty layer */
ntty_chars_in_buffer(struct tty_struct * tty)1782 static unsigned int ntty_chars_in_buffer(struct tty_struct *tty)
1783 {
1784 	struct port *port = tty->driver_data;
1785 	struct nozomi *dc = get_dc_by_tty(tty);
1786 
1787 	if (unlikely(!dc || !port))
1788 		return 0;
1789 
1790 	return kfifo_len(&port->fifo_ul);
1791 }
1792 
1793 static const struct tty_port_operations noz_tty_port_ops = {
1794 	.activate = ntty_activate,
1795 	.shutdown = ntty_shutdown,
1796 };
1797 
1798 static const struct tty_operations tty_ops = {
1799 	.ioctl = ntty_ioctl,
1800 	.open = ntty_open,
1801 	.close = ntty_close,
1802 	.hangup = ntty_hangup,
1803 	.write = ntty_write,
1804 	.write_room = ntty_write_room,
1805 	.unthrottle = ntty_unthrottle,
1806 	.throttle = ntty_throttle,
1807 	.chars_in_buffer = ntty_chars_in_buffer,
1808 	.tiocmget = ntty_tiocmget,
1809 	.tiocmset = ntty_tiocmset,
1810 	.get_icount = ntty_tiocgicount,
1811 	.install = ntty_install,
1812 	.cleanup = ntty_cleanup,
1813 };
1814 
1815 /* Module initialization */
1816 static struct pci_driver nozomi_driver = {
1817 	.name = NOZOMI_NAME,
1818 	.id_table = nozomi_pci_tbl,
1819 	.probe = nozomi_card_init,
1820 	.remove = nozomi_card_exit,
1821 };
1822 
nozomi_init(void)1823 static __init int nozomi_init(void)
1824 {
1825 	int ret;
1826 
1827 	ntty_driver = tty_alloc_driver(NTTY_TTY_MAXMINORS, TTY_DRIVER_REAL_RAW |
1828 			TTY_DRIVER_DYNAMIC_DEV);
1829 	if (IS_ERR(ntty_driver))
1830 		return PTR_ERR(ntty_driver);
1831 
1832 	ntty_driver->driver_name = NOZOMI_NAME_TTY;
1833 	ntty_driver->name = "noz";
1834 	ntty_driver->major = 0;
1835 	ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1836 	ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1837 	ntty_driver->init_termios = tty_std_termios;
1838 	ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1839 						HUPCL | CLOCAL;
1840 	ntty_driver->init_termios.c_ispeed = 115200;
1841 	ntty_driver->init_termios.c_ospeed = 115200;
1842 	tty_set_operations(ntty_driver, &tty_ops);
1843 
1844 	ret = tty_register_driver(ntty_driver);
1845 	if (ret) {
1846 		printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1847 		goto free_tty;
1848 	}
1849 
1850 	ret = pci_register_driver(&nozomi_driver);
1851 	if (ret) {
1852 		printk(KERN_ERR "Nozomi: can't register pci driver\n");
1853 		goto unr_tty;
1854 	}
1855 
1856 	return 0;
1857 unr_tty:
1858 	tty_unregister_driver(ntty_driver);
1859 free_tty:
1860 	tty_driver_kref_put(ntty_driver);
1861 	return ret;
1862 }
1863 
nozomi_exit(void)1864 static __exit void nozomi_exit(void)
1865 {
1866 	pci_unregister_driver(&nozomi_driver);
1867 	tty_unregister_driver(ntty_driver);
1868 	tty_driver_kref_put(ntty_driver);
1869 }
1870 
1871 module_init(nozomi_init);
1872 module_exit(nozomi_exit);
1873 
1874 MODULE_LICENSE("Dual BSD/GPL");
1875 MODULE_DESCRIPTION("Nozomi driver");
1876