xref: /linux/drivers/tty/nozomi.c (revision 06d07429858317ded2db7986113a9e0129cd599b)
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 #define TMP_BUF_MAX 256
69 
70 /*    Defines */
71 #define NOZOMI_NAME		"nozomi"
72 #define NOZOMI_NAME_TTY		"nozomi_tty"
73 
74 #define NTTY_TTY_MAXMINORS	256
75 #define NTTY_FIFO_BUFFER_SIZE	8192
76 
77 /* Must be power of 2 */
78 #define FIFO_BUFFER_SIZE_UL	8192
79 
80 /* Size of tmp send buffer to card */
81 #define SEND_BUF_MAX		1024
82 #define RECEIVE_BUF_MAX		4
83 
84 
85 #define R_IIR			0x0000	/* Interrupt Identity Register */
86 #define R_FCR			0x0000	/* Flow Control Register */
87 #define R_IER			0x0004	/* Interrupt Enable Register */
88 
89 #define NOZOMI_CONFIG_MAGIC	0xEFEFFEFE
90 #define TOGGLE_VALID		0x0000
91 
92 /* Definition of interrupt tokens */
93 #define MDM_DL1			0x0001
94 #define MDM_UL1			0x0002
95 #define MDM_DL2			0x0004
96 #define MDM_UL2			0x0008
97 #define DIAG_DL1		0x0010
98 #define DIAG_DL2		0x0020
99 #define DIAG_UL			0x0040
100 #define APP1_DL			0x0080
101 #define APP1_UL			0x0100
102 #define APP2_DL			0x0200
103 #define APP2_UL			0x0400
104 #define CTRL_DL			0x0800
105 #define CTRL_UL			0x1000
106 #define RESET			0x8000
107 
108 #define MDM_DL			(MDM_DL1  | MDM_DL2)
109 #define MDM_UL			(MDM_UL1  | MDM_UL2)
110 #define DIAG_DL			(DIAG_DL1 | DIAG_DL2)
111 
112 /* modem signal definition */
113 #define CTRL_DSR		0x0001
114 #define CTRL_DCD		0x0002
115 #define CTRL_RI			0x0004
116 #define CTRL_CTS		0x0008
117 
118 #define CTRL_DTR		0x0001
119 #define CTRL_RTS		0x0002
120 
121 #define MAX_PORT		4
122 #define NOZOMI_MAX_PORTS	5
123 #define NOZOMI_MAX_CARDS	(NTTY_TTY_MAXMINORS / MAX_PORT)
124 
125 /*    Type definitions */
126 
127 /*
128  * There are two types of nozomi cards,
129  * one with 2048 memory and with 8192 memory
130  */
131 enum card_type {
132 	F32_2 = 2048,	/* 512 bytes downlink + uplink * 2 -> 2048 */
133 	F32_8 = 8192,	/* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
134 };
135 
136 /* Initialization states a card can be in */
137 enum card_state {
138 	NOZOMI_STATE_UNKNOWN	= 0,
139 	NOZOMI_STATE_ENABLED	= 1,	/* pci device enabled */
140 	NOZOMI_STATE_ALLOCATED	= 2,	/* config setup done */
141 	NOZOMI_STATE_READY	= 3,	/* flowcontrols received */
142 };
143 
144 /* Two different toggle channels exist */
145 enum channel_type {
146 	CH_A = 0,
147 	CH_B = 1,
148 };
149 
150 /* Port definition for the card regarding flow control */
151 enum ctrl_port_type {
152 	CTRL_CMD	= 0,
153 	CTRL_MDM	= 1,
154 	CTRL_DIAG	= 2,
155 	CTRL_APP1	= 3,
156 	CTRL_APP2	= 4,
157 	CTRL_ERROR	= -1,
158 };
159 
160 /* Ports that the nozomi has */
161 enum port_type {
162 	PORT_MDM	= 0,
163 	PORT_DIAG	= 1,
164 	PORT_APP1	= 2,
165 	PORT_APP2	= 3,
166 	PORT_CTRL	= 4,
167 	PORT_ERROR	= -1,
168 };
169 
170 #ifdef __BIG_ENDIAN
171 /* Big endian */
172 
173 struct toggles {
174 	unsigned int enabled:5;	/*
175 				 * Toggle fields are valid if enabled is 0,
176 				 * else A-channels must always be used.
177 				 */
178 	unsigned int diag_dl:1;
179 	unsigned int mdm_dl:1;
180 	unsigned int mdm_ul:1;
181 } __attribute__ ((packed));
182 
183 /* Configuration table to read at startup of card */
184 /* Is for now only needed during initialization phase */
185 struct config_table {
186 	u32 signature;
187 	u16 product_information;
188 	u16 version;
189 	u8 pad3[3];
190 	struct toggles toggle;
191 	u8 pad1[4];
192 	u16 dl_mdm_len1;	/*
193 				 * If this is 64, it can hold
194 				 * 60 bytes + 4 that is length field
195 				 */
196 	u16 dl_start;
197 
198 	u16 dl_diag_len1;
199 	u16 dl_mdm_len2;	/*
200 				 * If this is 64, it can hold
201 				 * 60 bytes + 4 that is length field
202 				 */
203 	u16 dl_app1_len;
204 
205 	u16 dl_diag_len2;
206 	u16 dl_ctrl_len;
207 	u16 dl_app2_len;
208 	u8 pad2[16];
209 	u16 ul_mdm_len1;
210 	u16 ul_start;
211 	u16 ul_diag_len;
212 	u16 ul_mdm_len2;
213 	u16 ul_app1_len;
214 	u16 ul_app2_len;
215 	u16 ul_ctrl_len;
216 } __attribute__ ((packed));
217 
218 /* This stores all control downlink flags */
219 struct ctrl_dl {
220 	u8 port;
221 	unsigned int reserved:4;
222 	unsigned int CTS:1;
223 	unsigned int RI:1;
224 	unsigned int DCD:1;
225 	unsigned int DSR:1;
226 } __attribute__ ((packed));
227 
228 /* This stores all control uplink flags */
229 struct ctrl_ul {
230 	u8 port;
231 	unsigned int reserved:6;
232 	unsigned int RTS:1;
233 	unsigned int DTR:1;
234 } __attribute__ ((packed));
235 
236 #else
237 /* Little endian */
238 
239 /* This represents the toggle information */
240 struct toggles {
241 	unsigned int mdm_ul:1;
242 	unsigned int mdm_dl:1;
243 	unsigned int diag_dl:1;
244 	unsigned int enabled:5;	/*
245 				 * Toggle fields are valid if enabled is 0,
246 				 * else A-channels must always be used.
247 				 */
248 } __attribute__ ((packed));
249 
250 /* Configuration table to read at startup of card */
251 struct config_table {
252 	u32 signature;
253 	u16 version;
254 	u16 product_information;
255 	struct toggles toggle;
256 	u8 pad1[7];
257 	u16 dl_start;
258 	u16 dl_mdm_len1;	/*
259 				 * If this is 64, it can hold
260 				 * 60 bytes + 4 that is length field
261 				 */
262 	u16 dl_mdm_len2;
263 	u16 dl_diag_len1;
264 	u16 dl_diag_len2;
265 	u16 dl_app1_len;
266 	u16 dl_app2_len;
267 	u16 dl_ctrl_len;
268 	u8 pad2[16];
269 	u16 ul_start;
270 	u16 ul_mdm_len2;
271 	u16 ul_mdm_len1;
272 	u16 ul_diag_len;
273 	u16 ul_app1_len;
274 	u16 ul_app2_len;
275 	u16 ul_ctrl_len;
276 } __attribute__ ((packed));
277 
278 /* This stores all control downlink flags */
279 struct ctrl_dl {
280 	unsigned int DSR:1;
281 	unsigned int DCD:1;
282 	unsigned int RI:1;
283 	unsigned int CTS:1;
284 	unsigned int reserved:4;
285 	u8 port;
286 } __attribute__ ((packed));
287 
288 /* This stores all control uplink flags */
289 struct ctrl_ul {
290 	unsigned int DTR:1;
291 	unsigned int RTS:1;
292 	unsigned int reserved:6;
293 	u8 port;
294 } __attribute__ ((packed));
295 #endif
296 
297 /* This holds all information that is needed regarding a port */
298 struct port {
299 	struct tty_port port;
300 	u8 update_flow_control;
301 	struct ctrl_ul ctrl_ul;
302 	struct ctrl_dl ctrl_dl;
303 	struct kfifo fifo_ul;
304 	void __iomem *dl_addr[2];
305 	u32 dl_size[2];
306 	u8 toggle_dl;
307 	void __iomem *ul_addr[2];
308 	u32 ul_size[2];
309 	u8 toggle_ul;
310 	u16 token_dl;
311 
312 	wait_queue_head_t tty_wait;
313 	struct async_icount tty_icount;
314 
315 	struct nozomi *dc;
316 };
317 
318 /* Private data one for each card in the system */
319 struct nozomi {
320 	void __iomem *base_addr;
321 	unsigned long flip;
322 
323 	/* Pointers to registers */
324 	void __iomem *reg_iir;
325 	void __iomem *reg_fcr;
326 	void __iomem *reg_ier;
327 
328 	u16 last_ier;
329 	enum card_type card_type;
330 	struct config_table config_table;	/* Configuration table */
331 	struct pci_dev *pdev;
332 	struct port port[NOZOMI_MAX_PORTS];
333 	u8 *send_buf;
334 
335 	spinlock_t spin_mutex;	/* secures access to registers and tty */
336 
337 	unsigned int index_start;
338 	enum card_state state;
339 	u32 open_ttys;
340 };
341 
342 /* Global variables */
343 static const struct pci_device_id nozomi_pci_tbl[] = {
344 	{PCI_DEVICE(0x1931, 0x000c)},	/* Nozomi HSDPA */
345 	{},
346 };
347 
348 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
349 
350 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
351 static struct tty_driver *ntty_driver;
352 
353 static const struct tty_port_operations noz_tty_port_ops;
354 
355 /*
356  * find card by tty_index
357  */
get_dc_by_tty(const struct tty_struct * tty)358 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
359 {
360 	return tty ? ndevs[tty->index / MAX_PORT] : NULL;
361 }
362 
get_port_by_tty(const struct tty_struct * tty)363 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
364 {
365 	struct nozomi *ndev = get_dc_by_tty(tty);
366 	return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
367 }
368 
369 /*
370  * TODO:
371  * -Optimize
372  * -Rewrite cleaner
373  */
374 
read_mem32(u32 * buf,const void __iomem * mem_addr_start,u32 size_bytes)375 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
376 			u32 size_bytes)
377 {
378 	u32 i = 0;
379 	const u32 __iomem *ptr = mem_addr_start;
380 	u16 *buf16;
381 
382 	if (unlikely(!ptr || !buf))
383 		goto out;
384 
385 	/* shortcut for extremely often used cases */
386 	switch (size_bytes) {
387 	case 2:	/* 2 bytes */
388 		buf16 = (u16 *) buf;
389 		*buf16 = __le16_to_cpu(readw(ptr));
390 		goto out;
391 	case 4:	/* 4 bytes */
392 		*(buf) = __le32_to_cpu(readl(ptr));
393 		goto out;
394 	}
395 
396 	while (i < size_bytes) {
397 		if (size_bytes - i == 2) {
398 			/* Handle 2 bytes in the end */
399 			buf16 = (u16 *) buf;
400 			*(buf16) = __le16_to_cpu(readw(ptr));
401 			i += 2;
402 		} else {
403 			/* Read 4 bytes */
404 			*(buf) = __le32_to_cpu(readl(ptr));
405 			i += 4;
406 		}
407 		buf++;
408 		ptr++;
409 	}
410 out:
411 	return;
412 }
413 
414 /*
415  * TODO:
416  * -Optimize
417  * -Rewrite cleaner
418  */
write_mem32(void __iomem * mem_addr_start,const u32 * buf,u32 size_bytes)419 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
420 			u32 size_bytes)
421 {
422 	u32 i = 0;
423 	u32 __iomem *ptr = mem_addr_start;
424 	const u16 *buf16;
425 
426 	if (unlikely(!ptr || !buf))
427 		return 0;
428 
429 	/* shortcut for extremely often used cases */
430 	switch (size_bytes) {
431 	case 2:	/* 2 bytes */
432 		buf16 = (const u16 *)buf;
433 		writew(__cpu_to_le16(*buf16), ptr);
434 		return 2;
435 	case 1: /*
436 		 * also needs to write 4 bytes in this case
437 		 * so falling through..
438 		 */
439 		fallthrough;
440 	case 4: /* 4 bytes */
441 		writel(__cpu_to_le32(*buf), ptr);
442 		return 4;
443 	}
444 
445 	while (i < size_bytes) {
446 		if (size_bytes - i == 2) {
447 			/* 2 bytes */
448 			buf16 = (const u16 *)buf;
449 			writew(__cpu_to_le16(*buf16), ptr);
450 			i += 2;
451 		} else {
452 			/* 4 bytes */
453 			writel(__cpu_to_le32(*buf), ptr);
454 			i += 4;
455 		}
456 		buf++;
457 		ptr++;
458 	}
459 	return i;
460 }
461 
462 /* Setup pointers to different channels and also setup buffer sizes. */
nozomi_setup_memory(struct nozomi * dc)463 static void nozomi_setup_memory(struct nozomi *dc)
464 {
465 	void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
466 	/* The length reported is including the length field of 4 bytes,
467 	 * hence subtract with 4.
468 	 */
469 	const u16 buff_offset = 4;
470 
471 	/* Modem port dl configuration */
472 	dc->port[PORT_MDM].dl_addr[CH_A] = offset;
473 	dc->port[PORT_MDM].dl_addr[CH_B] =
474 				(offset += dc->config_table.dl_mdm_len1);
475 	dc->port[PORT_MDM].dl_size[CH_A] =
476 				dc->config_table.dl_mdm_len1 - buff_offset;
477 	dc->port[PORT_MDM].dl_size[CH_B] =
478 				dc->config_table.dl_mdm_len2 - buff_offset;
479 
480 	/* Diag port dl configuration */
481 	dc->port[PORT_DIAG].dl_addr[CH_A] =
482 				(offset += dc->config_table.dl_mdm_len2);
483 	dc->port[PORT_DIAG].dl_size[CH_A] =
484 				dc->config_table.dl_diag_len1 - buff_offset;
485 	dc->port[PORT_DIAG].dl_addr[CH_B] =
486 				(offset += dc->config_table.dl_diag_len1);
487 	dc->port[PORT_DIAG].dl_size[CH_B] =
488 				dc->config_table.dl_diag_len2 - buff_offset;
489 
490 	/* App1 port dl configuration */
491 	dc->port[PORT_APP1].dl_addr[CH_A] =
492 				(offset += dc->config_table.dl_diag_len2);
493 	dc->port[PORT_APP1].dl_size[CH_A] =
494 				dc->config_table.dl_app1_len - buff_offset;
495 
496 	/* App2 port dl configuration */
497 	dc->port[PORT_APP2].dl_addr[CH_A] =
498 				(offset += dc->config_table.dl_app1_len);
499 	dc->port[PORT_APP2].dl_size[CH_A] =
500 				dc->config_table.dl_app2_len - buff_offset;
501 
502 	/* Ctrl dl configuration */
503 	dc->port[PORT_CTRL].dl_addr[CH_A] =
504 				(offset += dc->config_table.dl_app2_len);
505 	dc->port[PORT_CTRL].dl_size[CH_A] =
506 				dc->config_table.dl_ctrl_len - buff_offset;
507 
508 	offset = dc->base_addr + dc->config_table.ul_start;
509 
510 	/* Modem Port ul configuration */
511 	dc->port[PORT_MDM].ul_addr[CH_A] = offset;
512 	dc->port[PORT_MDM].ul_size[CH_A] =
513 				dc->config_table.ul_mdm_len1 - buff_offset;
514 	dc->port[PORT_MDM].ul_addr[CH_B] =
515 				(offset += dc->config_table.ul_mdm_len1);
516 	dc->port[PORT_MDM].ul_size[CH_B] =
517 				dc->config_table.ul_mdm_len2 - buff_offset;
518 
519 	/* Diag port ul configuration */
520 	dc->port[PORT_DIAG].ul_addr[CH_A] =
521 				(offset += dc->config_table.ul_mdm_len2);
522 	dc->port[PORT_DIAG].ul_size[CH_A] =
523 				dc->config_table.ul_diag_len - buff_offset;
524 
525 	/* App1 port ul configuration */
526 	dc->port[PORT_APP1].ul_addr[CH_A] =
527 				(offset += dc->config_table.ul_diag_len);
528 	dc->port[PORT_APP1].ul_size[CH_A] =
529 				dc->config_table.ul_app1_len - buff_offset;
530 
531 	/* App2 port ul configuration */
532 	dc->port[PORT_APP2].ul_addr[CH_A] =
533 				(offset += dc->config_table.ul_app1_len);
534 	dc->port[PORT_APP2].ul_size[CH_A] =
535 				dc->config_table.ul_app2_len - buff_offset;
536 
537 	/* Ctrl ul configuration */
538 	dc->port[PORT_CTRL].ul_addr[CH_A] =
539 				(offset += dc->config_table.ul_app2_len);
540 	dc->port[PORT_CTRL].ul_size[CH_A] =
541 				dc->config_table.ul_ctrl_len - buff_offset;
542 }
543 
544 /* Dump config table under initalization phase */
545 #ifdef DEBUG
dump_table(const struct nozomi * dc)546 static void dump_table(const struct nozomi *dc)
547 {
548 	DBG3("signature: 0x%08X", dc->config_table.signature);
549 	DBG3("version: 0x%04X", dc->config_table.version);
550 	DBG3("product_information: 0x%04X", \
551 				dc->config_table.product_information);
552 	DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
553 	DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
554 	DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
555 	DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
556 
557 	DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
558 	DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
559 	   dc->config_table.dl_mdm_len1);
560 	DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
561 	   dc->config_table.dl_mdm_len2);
562 	DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
563 	   dc->config_table.dl_diag_len1);
564 	DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
565 	   dc->config_table.dl_diag_len2);
566 	DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
567 	   dc->config_table.dl_app1_len);
568 	DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
569 	   dc->config_table.dl_app2_len);
570 	DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
571 	   dc->config_table.dl_ctrl_len);
572 	DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
573 	   dc->config_table.ul_start);
574 	DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
575 	   dc->config_table.ul_mdm_len1);
576 	DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
577 	   dc->config_table.ul_mdm_len2);
578 	DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
579 	   dc->config_table.ul_diag_len);
580 	DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
581 	   dc->config_table.ul_app1_len);
582 	DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
583 	   dc->config_table.ul_app2_len);
584 	DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
585 	   dc->config_table.ul_ctrl_len);
586 }
587 #else
dump_table(const struct nozomi * dc)588 static inline void dump_table(const struct nozomi *dc) { }
589 #endif
590 
591 /*
592  * Read configuration table from card under intalization phase
593  * Returns 1 if ok, else 0
594  */
nozomi_read_config_table(struct nozomi * dc)595 static int nozomi_read_config_table(struct nozomi *dc)
596 {
597 	read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
598 						sizeof(struct config_table));
599 
600 	if (dc->config_table.signature != NOZOMI_CONFIG_MAGIC) {
601 		dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
602 			dc->config_table.signature, NOZOMI_CONFIG_MAGIC);
603 		return 0;
604 	}
605 
606 	if ((dc->config_table.version == 0)
607 	    || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
608 		int i;
609 		DBG1("Second phase, configuring card");
610 
611 		nozomi_setup_memory(dc);
612 
613 		dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
614 		dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
615 		dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
616 		DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
617 		   dc->port[PORT_MDM].toggle_ul,
618 		   dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
619 
620 		dump_table(dc);
621 
622 		for (i = PORT_MDM; i < MAX_PORT; i++) {
623 			memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
624 			memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
625 		}
626 
627 		/* Enable control channel */
628 		dc->last_ier = dc->last_ier | CTRL_DL;
629 		writew(dc->last_ier, dc->reg_ier);
630 
631 		dc->state = NOZOMI_STATE_ALLOCATED;
632 		dev_info(&dc->pdev->dev, "Initialization OK!\n");
633 		return 1;
634 	}
635 
636 	if ((dc->config_table.version > 0)
637 	    && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
638 		u32 offset = 0;
639 		DBG1("First phase: pushing upload buffers, clearing download");
640 
641 		dev_info(&dc->pdev->dev, "Version of card: %d\n",
642 			 dc->config_table.version);
643 
644 		/* Here we should disable all I/O over F32. */
645 		nozomi_setup_memory(dc);
646 
647 		/*
648 		 * We should send ALL channel pair tokens back along
649 		 * with reset token
650 		 */
651 
652 		/* push upload modem buffers */
653 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
654 			(u32 *) &offset, 4);
655 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
656 			(u32 *) &offset, 4);
657 
658 		writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
659 
660 		DBG1("First phase done");
661 	}
662 
663 	return 1;
664 }
665 
666 /* Enable uplink interrupts  */
enable_transmit_ul(enum port_type port,struct nozomi * dc)667 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
668 {
669 	static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
670 
671 	if (port < NOZOMI_MAX_PORTS) {
672 		dc->last_ier |= mask[port];
673 		writew(dc->last_ier, dc->reg_ier);
674 	} else {
675 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
676 	}
677 }
678 
679 /* Disable uplink interrupts  */
disable_transmit_ul(enum port_type port,struct nozomi * dc)680 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
681 {
682 	static const u16 mask[] =
683 		{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
684 
685 	if (port < NOZOMI_MAX_PORTS) {
686 		dc->last_ier &= mask[port];
687 		writew(dc->last_ier, dc->reg_ier);
688 	} else {
689 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
690 	}
691 }
692 
693 /* Enable downlink interrupts */
enable_transmit_dl(enum port_type port,struct nozomi * dc)694 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
695 {
696 	static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
697 
698 	if (port < NOZOMI_MAX_PORTS) {
699 		dc->last_ier |= mask[port];
700 		writew(dc->last_ier, dc->reg_ier);
701 	} else {
702 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
703 	}
704 }
705 
706 /* Disable downlink interrupts */
disable_transmit_dl(enum port_type port,struct nozomi * dc)707 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
708 {
709 	static const u16 mask[] =
710 		{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
711 
712 	if (port < NOZOMI_MAX_PORTS) {
713 		dc->last_ier &= mask[port];
714 		writew(dc->last_ier, dc->reg_ier);
715 	} else {
716 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
717 	}
718 }
719 
720 /*
721  * Return 1 - send buffer to card and ack.
722  * Return 0 - don't ack, don't send buffer to card.
723  */
send_data(enum port_type index,struct nozomi * dc)724 static int send_data(enum port_type index, struct nozomi *dc)
725 {
726 	u32 size = 0;
727 	struct port *port = &dc->port[index];
728 	const u8 toggle = port->toggle_ul;
729 	void __iomem *addr = port->ul_addr[toggle];
730 	const u32 ul_size = port->ul_size[toggle];
731 
732 	/* Get data from tty and place in buf for now */
733 	size = kfifo_out(&port->fifo_ul, dc->send_buf,
734 			   ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
735 
736 	if (size == 0) {
737 		DBG4("No more data to send, disable link:");
738 		return 0;
739 	}
740 
741 	/* Write length + data */
742 	write_mem32(addr, (u32 *) &size, 4);
743 	write_mem32(addr + 4, (u32 *) dc->send_buf, size);
744 
745 	tty_port_tty_wakeup(&port->port);
746 
747 	return 1;
748 }
749 
750 /* If all data has been read, return 1, else 0 */
receive_data(enum port_type index,struct nozomi * dc)751 static int receive_data(enum port_type index, struct nozomi *dc)
752 {
753 	u8 buf[RECEIVE_BUF_MAX] = { 0 };
754 	int size;
755 	u32 offset = 4;
756 	struct port *port = &dc->port[index];
757 	void __iomem *addr = port->dl_addr[port->toggle_dl];
758 	struct tty_struct *tty = tty_port_tty_get(&port->port);
759 	int i, ret;
760 
761 	size = __le32_to_cpu(readl(addr));
762 
763 	if (tty && tty_throttled(tty)) {
764 		DBG1("No room in tty, don't read data, don't ack interrupt, "
765 			"disable interrupt");
766 
767 		/* disable interrupt in downlink... */
768 		disable_transmit_dl(index, dc);
769 		ret = 0;
770 		goto put;
771 	}
772 
773 	if (unlikely(size == 0)) {
774 		dev_err(&dc->pdev->dev, "size == 0?\n");
775 		ret = 1;
776 		goto put;
777 	}
778 
779 	while (size > 0) {
780 		read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
781 
782 		if (size == 1) {
783 			tty_insert_flip_char(&port->port, buf[0], TTY_NORMAL);
784 			size = 0;
785 		} else if (size < RECEIVE_BUF_MAX) {
786 			size -= tty_insert_flip_string(&port->port, buf, size);
787 		} else {
788 			i = tty_insert_flip_string(&port->port, buf,
789 						   RECEIVE_BUF_MAX);
790 			size -= i;
791 			offset += i;
792 		}
793 	}
794 
795 	set_bit(index, &dc->flip);
796 	ret = 1;
797 put:
798 	tty_kref_put(tty);
799 	return ret;
800 }
801 
802 /* Debug for interrupts */
803 #ifdef DEBUG
interrupt2str(u16 interrupt)804 static char *interrupt2str(u16 interrupt)
805 {
806 	static char buf[TMP_BUF_MAX];
807 	char *p = buf;
808 
809 	if (interrupt & MDM_DL1)
810 		p += scnprintf(p, TMP_BUF_MAX, "MDM_DL1 ");
811 	if (interrupt & MDM_DL2)
812 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_DL2 ");
813 	if (interrupt & MDM_UL1)
814 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL1 ");
815 	if (interrupt & MDM_UL2)
816 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL2 ");
817 	if (interrupt & DIAG_DL1)
818 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL1 ");
819 	if (interrupt & DIAG_DL2)
820 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL2 ");
821 
822 	if (interrupt & DIAG_UL)
823 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_UL ");
824 
825 	if (interrupt & APP1_DL)
826 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_DL ");
827 	if (interrupt & APP2_DL)
828 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_DL ");
829 
830 	if (interrupt & APP1_UL)
831 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_UL ");
832 	if (interrupt & APP2_UL)
833 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_UL ");
834 
835 	if (interrupt & CTRL_DL)
836 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_DL ");
837 	if (interrupt & CTRL_UL)
838 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_UL ");
839 
840 	if (interrupt & RESET)
841 		p += scnprintf(p, TMP_BUF_MAX - (p - buf), "RESET ");
842 
843 	return buf;
844 }
845 #endif
846 
847 /*
848  * Receive flow control
849  * Return 1 - If ok, else 0
850  */
receive_flow_control(struct nozomi * dc)851 static int receive_flow_control(struct nozomi *dc)
852 {
853 	enum port_type port = PORT_MDM;
854 	struct ctrl_dl ctrl_dl;
855 	struct ctrl_dl old_ctrl;
856 	u16 enable_ier = 0;
857 
858 	read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
859 
860 	switch (ctrl_dl.port) {
861 	case CTRL_CMD:
862 		DBG1("The Base Band sends this value as a response to a "
863 			"request for IMSI detach sent over the control "
864 			"channel uplink (see section 7.6.1).");
865 		break;
866 	case CTRL_MDM:
867 		port = PORT_MDM;
868 		enable_ier = MDM_DL;
869 		break;
870 	case CTRL_DIAG:
871 		port = PORT_DIAG;
872 		enable_ier = DIAG_DL;
873 		break;
874 	case CTRL_APP1:
875 		port = PORT_APP1;
876 		enable_ier = APP1_DL;
877 		break;
878 	case CTRL_APP2:
879 		port = PORT_APP2;
880 		enable_ier = APP2_DL;
881 		if (dc->state == NOZOMI_STATE_ALLOCATED) {
882 			/*
883 			 * After card initialization the flow control
884 			 * received for APP2 is always the last
885 			 */
886 			dc->state = NOZOMI_STATE_READY;
887 			dev_info(&dc->pdev->dev, "Device READY!\n");
888 		}
889 		break;
890 	default:
891 		dev_err(&dc->pdev->dev,
892 			"ERROR: flow control received for non-existing port\n");
893 		return 0;
894 	}
895 
896 	DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
897 	   *((u16 *)&ctrl_dl));
898 
899 	old_ctrl = dc->port[port].ctrl_dl;
900 	dc->port[port].ctrl_dl = ctrl_dl;
901 
902 	if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
903 		DBG1("Disable interrupt (0x%04X) on port: %d",
904 			enable_ier, port);
905 		disable_transmit_ul(port, dc);
906 
907 	} else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
908 
909 		if (kfifo_len(&dc->port[port].fifo_ul)) {
910 			DBG1("Enable interrupt (0x%04X) on port: %d",
911 				enable_ier, port);
912 			DBG1("Data in buffer [%d], enable transmit! ",
913 				kfifo_len(&dc->port[port].fifo_ul));
914 			enable_transmit_ul(port, dc);
915 		} else {
916 			DBG1("No data in buffer...");
917 		}
918 	}
919 
920 	if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
921 		DBG1(" No change in mctrl");
922 		return 1;
923 	}
924 	/* Update statistics */
925 	if (old_ctrl.CTS != ctrl_dl.CTS)
926 		dc->port[port].tty_icount.cts++;
927 	if (old_ctrl.DSR != ctrl_dl.DSR)
928 		dc->port[port].tty_icount.dsr++;
929 	if (old_ctrl.RI != ctrl_dl.RI)
930 		dc->port[port].tty_icount.rng++;
931 	if (old_ctrl.DCD != ctrl_dl.DCD)
932 		dc->port[port].tty_icount.dcd++;
933 
934 	wake_up_interruptible(&dc->port[port].tty_wait);
935 
936 	DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
937 	   port,
938 	   dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
939 	   dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
940 
941 	return 1;
942 }
943 
port2ctrl(enum port_type port,const struct nozomi * dc)944 static enum ctrl_port_type port2ctrl(enum port_type port,
945 					const struct nozomi *dc)
946 {
947 	switch (port) {
948 	case PORT_MDM:
949 		return CTRL_MDM;
950 	case PORT_DIAG:
951 		return CTRL_DIAG;
952 	case PORT_APP1:
953 		return CTRL_APP1;
954 	case PORT_APP2:
955 		return CTRL_APP2;
956 	default:
957 		dev_err(&dc->pdev->dev,
958 			"ERROR: send flow control " \
959 			"received for non-existing port\n");
960 	}
961 	return CTRL_ERROR;
962 }
963 
964 /*
965  * Send flow control, can only update one channel at a time
966  * Return 0 - If we have updated all flow control
967  * Return 1 - If we need to update more flow control, ack current enable more
968  */
send_flow_control(struct nozomi * dc)969 static int send_flow_control(struct nozomi *dc)
970 {
971 	u32 i, more_flow_control_to_be_updated = 0;
972 	u16 *ctrl;
973 
974 	for (i = PORT_MDM; i < MAX_PORT; i++) {
975 		if (dc->port[i].update_flow_control) {
976 			if (more_flow_control_to_be_updated) {
977 				/* We have more flow control to be updated */
978 				return 1;
979 			}
980 			dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
981 			ctrl = (u16 *)&dc->port[i].ctrl_ul;
982 			write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
983 				(u32 *) ctrl, 2);
984 			dc->port[i].update_flow_control = 0;
985 			more_flow_control_to_be_updated = 1;
986 		}
987 	}
988 	return 0;
989 }
990 
991 /*
992  * Handle downlink data, ports that are handled are modem and diagnostics
993  * Return 1 - ok
994  * Return 0 - toggle fields are out of sync
995  */
handle_data_dl(struct nozomi * dc,enum port_type port,u8 * toggle,u16 read_iir,u16 mask1,u16 mask2)996 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
997 			u16 read_iir, u16 mask1, u16 mask2)
998 {
999 	if (*toggle == 0 && read_iir & mask1) {
1000 		if (receive_data(port, dc)) {
1001 			writew(mask1, dc->reg_fcr);
1002 			*toggle = !(*toggle);
1003 		}
1004 
1005 		if (read_iir & mask2) {
1006 			if (receive_data(port, dc)) {
1007 				writew(mask2, dc->reg_fcr);
1008 				*toggle = !(*toggle);
1009 			}
1010 		}
1011 	} else if (*toggle == 1 && read_iir & mask2) {
1012 		if (receive_data(port, dc)) {
1013 			writew(mask2, dc->reg_fcr);
1014 			*toggle = !(*toggle);
1015 		}
1016 
1017 		if (read_iir & mask1) {
1018 			if (receive_data(port, dc)) {
1019 				writew(mask1, dc->reg_fcr);
1020 				*toggle = !(*toggle);
1021 			}
1022 		}
1023 	} else {
1024 		dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1025 			*toggle);
1026 		return 0;
1027 	}
1028 	return 1;
1029 }
1030 
1031 /*
1032  * Handle uplink data, this is currently for the modem port
1033  * Return 1 - ok
1034  * Return 0 - toggle field are out of sync
1035  */
handle_data_ul(struct nozomi * dc,enum port_type port,u16 read_iir)1036 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1037 {
1038 	u8 *toggle = &(dc->port[port].toggle_ul);
1039 
1040 	if (*toggle == 0 && read_iir & MDM_UL1) {
1041 		dc->last_ier &= ~MDM_UL;
1042 		writew(dc->last_ier, dc->reg_ier);
1043 		if (send_data(port, dc)) {
1044 			writew(MDM_UL1, dc->reg_fcr);
1045 			dc->last_ier = dc->last_ier | MDM_UL;
1046 			writew(dc->last_ier, dc->reg_ier);
1047 			*toggle = !*toggle;
1048 		}
1049 
1050 		if (read_iir & MDM_UL2) {
1051 			dc->last_ier &= ~MDM_UL;
1052 			writew(dc->last_ier, dc->reg_ier);
1053 			if (send_data(port, dc)) {
1054 				writew(MDM_UL2, dc->reg_fcr);
1055 				dc->last_ier = dc->last_ier | MDM_UL;
1056 				writew(dc->last_ier, dc->reg_ier);
1057 				*toggle = !*toggle;
1058 			}
1059 		}
1060 
1061 	} else if (*toggle == 1 && read_iir & MDM_UL2) {
1062 		dc->last_ier &= ~MDM_UL;
1063 		writew(dc->last_ier, dc->reg_ier);
1064 		if (send_data(port, dc)) {
1065 			writew(MDM_UL2, dc->reg_fcr);
1066 			dc->last_ier = dc->last_ier | MDM_UL;
1067 			writew(dc->last_ier, dc->reg_ier);
1068 			*toggle = !*toggle;
1069 		}
1070 
1071 		if (read_iir & MDM_UL1) {
1072 			dc->last_ier &= ~MDM_UL;
1073 			writew(dc->last_ier, dc->reg_ier);
1074 			if (send_data(port, dc)) {
1075 				writew(MDM_UL1, dc->reg_fcr);
1076 				dc->last_ier = dc->last_ier | MDM_UL;
1077 				writew(dc->last_ier, dc->reg_ier);
1078 				*toggle = !*toggle;
1079 			}
1080 		}
1081 	} else {
1082 		writew(read_iir & MDM_UL, dc->reg_fcr);
1083 		dev_err(&dc->pdev->dev, "port out of sync!\n");
1084 		return 0;
1085 	}
1086 	return 1;
1087 }
1088 
interrupt_handler(int irq,void * dev_id)1089 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1090 {
1091 	struct nozomi *dc = dev_id;
1092 	unsigned int a;
1093 	u16 read_iir;
1094 
1095 	if (!dc)
1096 		return IRQ_NONE;
1097 
1098 	spin_lock(&dc->spin_mutex);
1099 	read_iir = readw(dc->reg_iir);
1100 
1101 	/* Card removed */
1102 	if (read_iir == (u16)-1)
1103 		goto none;
1104 	/*
1105 	 * Just handle interrupt enabled in IER
1106 	 * (by masking with dc->last_ier)
1107 	 */
1108 	read_iir &= dc->last_ier;
1109 
1110 	if (read_iir == 0)
1111 		goto none;
1112 
1113 
1114 	DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1115 		dc->last_ier);
1116 
1117 	if (read_iir & RESET) {
1118 		if (unlikely(!nozomi_read_config_table(dc))) {
1119 			dc->last_ier = 0x0;
1120 			writew(dc->last_ier, dc->reg_ier);
1121 			dev_err(&dc->pdev->dev, "Could not read status from "
1122 				"card, we should disable interface\n");
1123 		} else {
1124 			writew(RESET, dc->reg_fcr);
1125 		}
1126 		/* No more useful info if this was the reset interrupt. */
1127 		goto exit_handler;
1128 	}
1129 	if (read_iir & CTRL_UL) {
1130 		DBG1("CTRL_UL");
1131 		dc->last_ier &= ~CTRL_UL;
1132 		writew(dc->last_ier, dc->reg_ier);
1133 		if (send_flow_control(dc)) {
1134 			writew(CTRL_UL, dc->reg_fcr);
1135 			dc->last_ier = dc->last_ier | CTRL_UL;
1136 			writew(dc->last_ier, dc->reg_ier);
1137 		}
1138 	}
1139 	if (read_iir & CTRL_DL) {
1140 		receive_flow_control(dc);
1141 		writew(CTRL_DL, dc->reg_fcr);
1142 	}
1143 	if (read_iir & MDM_DL) {
1144 		if (!handle_data_dl(dc, PORT_MDM,
1145 				&(dc->port[PORT_MDM].toggle_dl), read_iir,
1146 				MDM_DL1, MDM_DL2)) {
1147 			dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1148 			goto exit_handler;
1149 		}
1150 	}
1151 	if (read_iir & MDM_UL) {
1152 		if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1153 			dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1154 			goto exit_handler;
1155 		}
1156 	}
1157 	if (read_iir & DIAG_DL) {
1158 		if (!handle_data_dl(dc, PORT_DIAG,
1159 				&(dc->port[PORT_DIAG].toggle_dl), read_iir,
1160 				DIAG_DL1, DIAG_DL2)) {
1161 			dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1162 			goto exit_handler;
1163 		}
1164 	}
1165 	if (read_iir & DIAG_UL) {
1166 		dc->last_ier &= ~DIAG_UL;
1167 		writew(dc->last_ier, dc->reg_ier);
1168 		if (send_data(PORT_DIAG, dc)) {
1169 			writew(DIAG_UL, dc->reg_fcr);
1170 			dc->last_ier = dc->last_ier | DIAG_UL;
1171 			writew(dc->last_ier, dc->reg_ier);
1172 		}
1173 	}
1174 	if (read_iir & APP1_DL) {
1175 		if (receive_data(PORT_APP1, dc))
1176 			writew(APP1_DL, dc->reg_fcr);
1177 	}
1178 	if (read_iir & APP1_UL) {
1179 		dc->last_ier &= ~APP1_UL;
1180 		writew(dc->last_ier, dc->reg_ier);
1181 		if (send_data(PORT_APP1, dc)) {
1182 			writew(APP1_UL, dc->reg_fcr);
1183 			dc->last_ier = dc->last_ier | APP1_UL;
1184 			writew(dc->last_ier, dc->reg_ier);
1185 		}
1186 	}
1187 	if (read_iir & APP2_DL) {
1188 		if (receive_data(PORT_APP2, dc))
1189 			writew(APP2_DL, dc->reg_fcr);
1190 	}
1191 	if (read_iir & APP2_UL) {
1192 		dc->last_ier &= ~APP2_UL;
1193 		writew(dc->last_ier, dc->reg_ier);
1194 		if (send_data(PORT_APP2, dc)) {
1195 			writew(APP2_UL, dc->reg_fcr);
1196 			dc->last_ier = dc->last_ier | APP2_UL;
1197 			writew(dc->last_ier, dc->reg_ier);
1198 		}
1199 	}
1200 
1201 exit_handler:
1202 	spin_unlock(&dc->spin_mutex);
1203 
1204 	for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1205 		if (test_and_clear_bit(a, &dc->flip))
1206 			tty_flip_buffer_push(&dc->port[a].port);
1207 
1208 	return IRQ_HANDLED;
1209 none:
1210 	spin_unlock(&dc->spin_mutex);
1211 	return IRQ_NONE;
1212 }
1213 
nozomi_get_card_type(struct nozomi * dc)1214 static void nozomi_get_card_type(struct nozomi *dc)
1215 {
1216 	int i;
1217 	u32 size = 0;
1218 
1219 	for (i = 0; i < 6; i++)
1220 		size += pci_resource_len(dc->pdev, i);
1221 
1222 	/* Assume card type F32_8 if no match */
1223 	dc->card_type = size == 2048 ? F32_2 : F32_8;
1224 
1225 	dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1226 }
1227 
nozomi_setup_private_data(struct nozomi * dc)1228 static void nozomi_setup_private_data(struct nozomi *dc)
1229 {
1230 	void __iomem *offset = dc->base_addr + dc->card_type / 2;
1231 	unsigned int i;
1232 
1233 	dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1234 	dc->reg_iir = (void __iomem *)(offset + R_IIR);
1235 	dc->reg_ier = (void __iomem *)(offset + R_IER);
1236 	dc->last_ier = 0;
1237 	dc->flip = 0;
1238 
1239 	dc->port[PORT_MDM].token_dl = MDM_DL;
1240 	dc->port[PORT_DIAG].token_dl = DIAG_DL;
1241 	dc->port[PORT_APP1].token_dl = APP1_DL;
1242 	dc->port[PORT_APP2].token_dl = APP2_DL;
1243 
1244 	for (i = 0; i < MAX_PORT; i++)
1245 		init_waitqueue_head(&dc->port[i].tty_wait);
1246 }
1247 
card_type_show(struct device * dev,struct device_attribute * attr,char * buf)1248 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1249 			  char *buf)
1250 {
1251 	const struct nozomi *dc = dev_get_drvdata(dev);
1252 
1253 	return sprintf(buf, "%d\n", dc->card_type);
1254 }
1255 static DEVICE_ATTR_RO(card_type);
1256 
open_ttys_show(struct device * dev,struct device_attribute * attr,char * buf)1257 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1258 			  char *buf)
1259 {
1260 	const struct nozomi *dc = dev_get_drvdata(dev);
1261 
1262 	return sprintf(buf, "%u\n", dc->open_ttys);
1263 }
1264 static DEVICE_ATTR_RO(open_ttys);
1265 
make_sysfs_files(struct nozomi * dc)1266 static void make_sysfs_files(struct nozomi *dc)
1267 {
1268 	if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1269 		dev_err(&dc->pdev->dev,
1270 			"Could not create sysfs file for card_type\n");
1271 	if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1272 		dev_err(&dc->pdev->dev,
1273 			"Could not create sysfs file for open_ttys\n");
1274 }
1275 
remove_sysfs_files(struct nozomi * dc)1276 static void remove_sysfs_files(struct nozomi *dc)
1277 {
1278 	device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1279 	device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1280 }
1281 
1282 /* Allocate memory for one device */
nozomi_card_init(struct pci_dev * pdev,const struct pci_device_id * ent)1283 static int nozomi_card_init(struct pci_dev *pdev,
1284 				      const struct pci_device_id *ent)
1285 {
1286 	int ret;
1287 	struct nozomi *dc = NULL;
1288 	int ndev_idx;
1289 	int i;
1290 
1291 	for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1292 		if (!ndevs[ndev_idx])
1293 			break;
1294 
1295 	if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1296 		dev_err(&pdev->dev, "no free tty range for this card left\n");
1297 		ret = -EIO;
1298 		goto err;
1299 	}
1300 
1301 	dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1302 	if (unlikely(!dc)) {
1303 		dev_err(&pdev->dev, "Could not allocate memory\n");
1304 		ret = -ENOMEM;
1305 		goto err_free;
1306 	}
1307 
1308 	dc->pdev = pdev;
1309 
1310 	ret = pci_enable_device(dc->pdev);
1311 	if (ret) {
1312 		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1313 		goto err_free;
1314 	}
1315 
1316 	ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1317 	if (ret) {
1318 		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1319 			(int) /* nozomi_private.io_addr */ 0);
1320 		goto err_disable_device;
1321 	}
1322 
1323 	/* Find out what card type it is */
1324 	nozomi_get_card_type(dc);
1325 
1326 	dc->base_addr = pci_iomap(dc->pdev, 0, dc->card_type);
1327 	if (!dc->base_addr) {
1328 		dev_err(&pdev->dev, "Unable to map card MMIO\n");
1329 		ret = -ENODEV;
1330 		goto err_rel_regs;
1331 	}
1332 
1333 	dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1334 	if (!dc->send_buf) {
1335 		dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1336 		ret = -ENOMEM;
1337 		goto err_free_sbuf;
1338 	}
1339 
1340 	for (i = PORT_MDM; i < MAX_PORT; i++) {
1341 		if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1342 					GFP_KERNEL)) {
1343 			dev_err(&pdev->dev,
1344 					"Could not allocate kfifo buffer\n");
1345 			ret = -ENOMEM;
1346 			goto err_free_kfifo;
1347 		}
1348 	}
1349 
1350 	spin_lock_init(&dc->spin_mutex);
1351 
1352 	nozomi_setup_private_data(dc);
1353 
1354 	/* Disable all interrupts */
1355 	dc->last_ier = 0;
1356 	writew(dc->last_ier, dc->reg_ier);
1357 
1358 	ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1359 			NOZOMI_NAME, dc);
1360 	if (unlikely(ret)) {
1361 		dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1362 		goto err_free_all_kfifo;
1363 	}
1364 
1365 	DBG1("base_addr: %p", dc->base_addr);
1366 
1367 	make_sysfs_files(dc);
1368 
1369 	dc->index_start = ndev_idx * MAX_PORT;
1370 	ndevs[ndev_idx] = dc;
1371 
1372 	pci_set_drvdata(pdev, dc);
1373 
1374 	/* Enable RESET interrupt */
1375 	dc->last_ier = RESET;
1376 	iowrite16(dc->last_ier, dc->reg_ier);
1377 
1378 	dc->state = NOZOMI_STATE_ENABLED;
1379 
1380 	for (i = 0; i < MAX_PORT; i++) {
1381 		struct device *tty_dev;
1382 		struct port *port = &dc->port[i];
1383 		port->dc = dc;
1384 		tty_port_init(&port->port);
1385 		port->port.ops = &noz_tty_port_ops;
1386 		tty_dev = tty_port_register_device(&port->port, ntty_driver,
1387 				dc->index_start + i, &pdev->dev);
1388 
1389 		if (IS_ERR(tty_dev)) {
1390 			ret = PTR_ERR(tty_dev);
1391 			dev_err(&pdev->dev, "Could not allocate tty?\n");
1392 			tty_port_destroy(&port->port);
1393 			goto err_free_tty;
1394 		}
1395 	}
1396 
1397 	return 0;
1398 
1399 err_free_tty:
1400 	for (i--; i >= 0; i--) {
1401 		tty_unregister_device(ntty_driver, dc->index_start + i);
1402 		tty_port_destroy(&dc->port[i].port);
1403 	}
1404 	free_irq(pdev->irq, dc);
1405 err_free_all_kfifo:
1406 	i = MAX_PORT;
1407 err_free_kfifo:
1408 	for (i--; i >= PORT_MDM; i--)
1409 		kfifo_free(&dc->port[i].fifo_ul);
1410 err_free_sbuf:
1411 	kfree(dc->send_buf);
1412 	iounmap(dc->base_addr);
1413 err_rel_regs:
1414 	pci_release_regions(pdev);
1415 err_disable_device:
1416 	pci_disable_device(pdev);
1417 err_free:
1418 	kfree(dc);
1419 err:
1420 	return ret;
1421 }
1422 
tty_exit(struct nozomi * dc)1423 static void tty_exit(struct nozomi *dc)
1424 {
1425 	unsigned int i;
1426 
1427 	for (i = 0; i < MAX_PORT; ++i)
1428 		tty_port_tty_hangup(&dc->port[i].port, false);
1429 
1430 	/* Racy below - surely should wait for scheduled work to be done or
1431 	   complete off a hangup method ? */
1432 	while (dc->open_ttys)
1433 		msleep(1);
1434 	for (i = 0; i < MAX_PORT; ++i) {
1435 		tty_unregister_device(ntty_driver, dc->index_start + i);
1436 		tty_port_destroy(&dc->port[i].port);
1437 	}
1438 }
1439 
1440 /* Deallocate memory for one device */
nozomi_card_exit(struct pci_dev * pdev)1441 static void nozomi_card_exit(struct pci_dev *pdev)
1442 {
1443 	int i;
1444 	struct ctrl_ul ctrl;
1445 	struct nozomi *dc = pci_get_drvdata(pdev);
1446 
1447 	/* Disable all interrupts */
1448 	dc->last_ier = 0;
1449 	writew(dc->last_ier, dc->reg_ier);
1450 
1451 	tty_exit(dc);
1452 
1453 	/* Send 0x0001, command card to resend the reset token.  */
1454 	/* This is to get the reset when the module is reloaded. */
1455 	ctrl.port = 0x00;
1456 	ctrl.reserved = 0;
1457 	ctrl.RTS = 0;
1458 	ctrl.DTR = 1;
1459 	DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1460 
1461 	/* Setup dc->reg addresses to we can use defines here */
1462 	write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1463 	writew(CTRL_UL, dc->reg_fcr);	/* push the token to the card. */
1464 
1465 	remove_sysfs_files(dc);
1466 
1467 	free_irq(pdev->irq, dc);
1468 
1469 	for (i = 0; i < MAX_PORT; i++)
1470 		kfifo_free(&dc->port[i].fifo_ul);
1471 
1472 	kfree(dc->send_buf);
1473 
1474 	iounmap(dc->base_addr);
1475 
1476 	pci_release_regions(pdev);
1477 
1478 	pci_disable_device(pdev);
1479 
1480 	ndevs[dc->index_start / MAX_PORT] = NULL;
1481 
1482 	kfree(dc);
1483 }
1484 
set_rts(const struct tty_struct * tty,int rts)1485 static void set_rts(const struct tty_struct *tty, int rts)
1486 {
1487 	struct port *port = get_port_by_tty(tty);
1488 
1489 	port->ctrl_ul.RTS = rts;
1490 	port->update_flow_control = 1;
1491 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1492 }
1493 
set_dtr(const struct tty_struct * tty,int dtr)1494 static void set_dtr(const struct tty_struct *tty, int dtr)
1495 {
1496 	struct port *port = get_port_by_tty(tty);
1497 
1498 	DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1499 
1500 	port->ctrl_ul.DTR = dtr;
1501 	port->update_flow_control = 1;
1502 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1503 }
1504 
1505 /*
1506  * ----------------------------------------------------------------------------
1507  * TTY code
1508  * ----------------------------------------------------------------------------
1509  */
1510 
ntty_install(struct tty_driver * driver,struct tty_struct * tty)1511 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1512 {
1513 	struct port *port = get_port_by_tty(tty);
1514 	struct nozomi *dc = get_dc_by_tty(tty);
1515 	int ret;
1516 	if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1517 		return -ENODEV;
1518 	ret = tty_standard_install(driver, tty);
1519 	if (ret == 0)
1520 		tty->driver_data = port;
1521 	return ret;
1522 }
1523 
ntty_cleanup(struct tty_struct * tty)1524 static void ntty_cleanup(struct tty_struct *tty)
1525 {
1526 	tty->driver_data = NULL;
1527 }
1528 
ntty_activate(struct tty_port * tport,struct tty_struct * tty)1529 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1530 {
1531 	struct port *port = container_of(tport, struct port, port);
1532 	struct nozomi *dc = port->dc;
1533 	unsigned long flags;
1534 
1535 	DBG1("open: %d", port->token_dl);
1536 	spin_lock_irqsave(&dc->spin_mutex, flags);
1537 	dc->last_ier = dc->last_ier | port->token_dl;
1538 	writew(dc->last_ier, dc->reg_ier);
1539 	dc->open_ttys++;
1540 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1541 	printk("noz: activated %d: %p\n", tty->index, tport);
1542 	return 0;
1543 }
1544 
ntty_open(struct tty_struct * tty,struct file * filp)1545 static int ntty_open(struct tty_struct *tty, struct file *filp)
1546 {
1547 	struct port *port = tty->driver_data;
1548 	return tty_port_open(&port->port, tty, filp);
1549 }
1550 
ntty_shutdown(struct tty_port * tport)1551 static void ntty_shutdown(struct tty_port *tport)
1552 {
1553 	struct port *port = container_of(tport, struct port, port);
1554 	struct nozomi *dc = port->dc;
1555 	unsigned long flags;
1556 
1557 	DBG1("close: %d", port->token_dl);
1558 	spin_lock_irqsave(&dc->spin_mutex, flags);
1559 	dc->last_ier &= ~(port->token_dl);
1560 	writew(dc->last_ier, dc->reg_ier);
1561 	dc->open_ttys--;
1562 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1563 	printk("noz: shutdown %p\n", tport);
1564 }
1565 
ntty_close(struct tty_struct * tty,struct file * filp)1566 static void ntty_close(struct tty_struct *tty, struct file *filp)
1567 {
1568 	struct port *port = tty->driver_data;
1569 	if (port)
1570 		tty_port_close(&port->port, tty, filp);
1571 }
1572 
ntty_hangup(struct tty_struct * tty)1573 static void ntty_hangup(struct tty_struct *tty)
1574 {
1575 	struct port *port = tty->driver_data;
1576 	tty_port_hangup(&port->port);
1577 }
1578 
1579 /*
1580  * called when the userspace process writes to the tty (/dev/noz*).
1581  * Data is inserted into a fifo, which is then read and transferred to the modem.
1582  */
ntty_write(struct tty_struct * tty,const u8 * buffer,size_t count)1583 static ssize_t ntty_write(struct tty_struct *tty, const u8 *buffer,
1584 			  size_t count)
1585 {
1586 	struct nozomi *dc = get_dc_by_tty(tty);
1587 	struct port *port = tty->driver_data;
1588 	unsigned long flags;
1589 	size_t rval;
1590 
1591 	if (!dc || !port)
1592 		return -ENODEV;
1593 
1594 	rval = kfifo_in(&port->fifo_ul, buffer, count);
1595 
1596 	spin_lock_irqsave(&dc->spin_mutex, flags);
1597 	/* CTS is only valid on the modem channel */
1598 	if (port == &(dc->port[PORT_MDM])) {
1599 		if (port->ctrl_dl.CTS) {
1600 			DBG4("Enable interrupt");
1601 			enable_transmit_ul(tty->index % MAX_PORT, dc);
1602 		} else {
1603 			dev_err(&dc->pdev->dev,
1604 				"CTS not active on modem port?\n");
1605 		}
1606 	} else {
1607 		enable_transmit_ul(tty->index % MAX_PORT, dc);
1608 	}
1609 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1610 
1611 	return rval;
1612 }
1613 
1614 /*
1615  * Calculate how much is left in device
1616  * This method is called by the upper tty layer.
1617  *   #according to sources N_TTY.c it expects a value >= 0 and
1618  *    does not check for negative values.
1619  *
1620  * If the port is unplugged report lots of room and let the bits
1621  * dribble away so we don't block anything.
1622  */
ntty_write_room(struct tty_struct * tty)1623 static unsigned int ntty_write_room(struct tty_struct *tty)
1624 {
1625 	struct port *port = tty->driver_data;
1626 	unsigned int room = 4096;
1627 	const struct nozomi *dc = get_dc_by_tty(tty);
1628 
1629 	if (dc)
1630 		room = kfifo_avail(&port->fifo_ul);
1631 
1632 	return room;
1633 }
1634 
1635 /* Gets io control parameters */
ntty_tiocmget(struct tty_struct * tty)1636 static int ntty_tiocmget(struct tty_struct *tty)
1637 {
1638 	const struct port *port = tty->driver_data;
1639 	const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1640 	const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1641 
1642 	/* Note: these could change under us but it is not clear this
1643 	   matters if so */
1644 	return (ctrl_ul->RTS ? TIOCM_RTS : 0)
1645 		| (ctrl_ul->DTR ? TIOCM_DTR : 0)
1646 		| (ctrl_dl->DCD ? TIOCM_CAR : 0)
1647 		| (ctrl_dl->RI  ? TIOCM_RNG : 0)
1648 		| (ctrl_dl->DSR ? TIOCM_DSR : 0)
1649 		| (ctrl_dl->CTS ? TIOCM_CTS : 0);
1650 }
1651 
1652 /* Sets io controls parameters */
ntty_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1653 static int ntty_tiocmset(struct tty_struct *tty,
1654 					unsigned int set, unsigned int clear)
1655 {
1656 	struct nozomi *dc = get_dc_by_tty(tty);
1657 	unsigned long flags;
1658 
1659 	spin_lock_irqsave(&dc->spin_mutex, flags);
1660 	if (set & TIOCM_RTS)
1661 		set_rts(tty, 1);
1662 	else if (clear & TIOCM_RTS)
1663 		set_rts(tty, 0);
1664 
1665 	if (set & TIOCM_DTR)
1666 		set_dtr(tty, 1);
1667 	else if (clear & TIOCM_DTR)
1668 		set_dtr(tty, 0);
1669 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1670 
1671 	return 0;
1672 }
1673 
ntty_cflags_changed(struct port * port,unsigned long flags,struct async_icount * cprev)1674 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1675 		struct async_icount *cprev)
1676 {
1677 	const struct async_icount cnow = port->tty_icount;
1678 	int ret;
1679 
1680 	ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng))
1681 		|| ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr))
1682 		|| ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd))
1683 		|| ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1684 
1685 	*cprev = cnow;
1686 
1687 	return ret;
1688 }
1689 
ntty_tiocgicount(struct tty_struct * tty,struct serial_icounter_struct * icount)1690 static int ntty_tiocgicount(struct tty_struct *tty,
1691 				struct serial_icounter_struct *icount)
1692 {
1693 	struct port *port = tty->driver_data;
1694 	const struct async_icount cnow = port->tty_icount;
1695 
1696 	icount->cts = cnow.cts;
1697 	icount->dsr = cnow.dsr;
1698 	icount->rng = cnow.rng;
1699 	icount->dcd = cnow.dcd;
1700 	icount->rx = cnow.rx;
1701 	icount->tx = cnow.tx;
1702 	icount->frame = cnow.frame;
1703 	icount->overrun = cnow.overrun;
1704 	icount->parity = cnow.parity;
1705 	icount->brk = cnow.brk;
1706 	icount->buf_overrun = cnow.buf_overrun;
1707 	return 0;
1708 }
1709 
ntty_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1710 static int ntty_ioctl(struct tty_struct *tty,
1711 		      unsigned int cmd, unsigned long arg)
1712 {
1713 	struct port *port = tty->driver_data;
1714 	int rval = -ENOIOCTLCMD;
1715 
1716 	switch (cmd) {
1717 	case TIOCMIWAIT: {
1718 		struct async_icount cprev = port->tty_icount;
1719 
1720 		rval = wait_event_interruptible(port->tty_wait,
1721 				ntty_cflags_changed(port, arg, &cprev));
1722 		break;
1723 	}
1724 	default:
1725 		DBG1("ERR: 0x%08X, %d", cmd, cmd);
1726 		break;
1727 	}
1728 
1729 	return rval;
1730 }
1731 
1732 /*
1733  * Called by the upper tty layer when tty buffers are ready
1734  * to receive data again after a call to throttle.
1735  */
ntty_unthrottle(struct tty_struct * tty)1736 static void ntty_unthrottle(struct tty_struct *tty)
1737 {
1738 	struct nozomi *dc = get_dc_by_tty(tty);
1739 	unsigned long flags;
1740 
1741 	spin_lock_irqsave(&dc->spin_mutex, flags);
1742 	enable_transmit_dl(tty->index % MAX_PORT, dc);
1743 	set_rts(tty, 1);
1744 
1745 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1746 }
1747 
1748 /*
1749  * Called by the upper tty layer when the tty buffers are almost full.
1750  * The driver should stop send more data.
1751  */
ntty_throttle(struct tty_struct * tty)1752 static void ntty_throttle(struct tty_struct *tty)
1753 {
1754 	struct nozomi *dc = get_dc_by_tty(tty);
1755 	unsigned long flags;
1756 
1757 	spin_lock_irqsave(&dc->spin_mutex, flags);
1758 	set_rts(tty, 0);
1759 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1760 }
1761 
1762 /* Returns number of chars in buffer, called by tty layer */
ntty_chars_in_buffer(struct tty_struct * tty)1763 static unsigned int ntty_chars_in_buffer(struct tty_struct *tty)
1764 {
1765 	struct port *port = tty->driver_data;
1766 	struct nozomi *dc = get_dc_by_tty(tty);
1767 
1768 	if (unlikely(!dc || !port))
1769 		return 0;
1770 
1771 	return kfifo_len(&port->fifo_ul);
1772 }
1773 
1774 static const struct tty_port_operations noz_tty_port_ops = {
1775 	.activate = ntty_activate,
1776 	.shutdown = ntty_shutdown,
1777 };
1778 
1779 static const struct tty_operations tty_ops = {
1780 	.ioctl = ntty_ioctl,
1781 	.open = ntty_open,
1782 	.close = ntty_close,
1783 	.hangup = ntty_hangup,
1784 	.write = ntty_write,
1785 	.write_room = ntty_write_room,
1786 	.unthrottle = ntty_unthrottle,
1787 	.throttle = ntty_throttle,
1788 	.chars_in_buffer = ntty_chars_in_buffer,
1789 	.tiocmget = ntty_tiocmget,
1790 	.tiocmset = ntty_tiocmset,
1791 	.get_icount = ntty_tiocgicount,
1792 	.install = ntty_install,
1793 	.cleanup = ntty_cleanup,
1794 };
1795 
1796 /* Module initialization */
1797 static struct pci_driver nozomi_driver = {
1798 	.name = NOZOMI_NAME,
1799 	.id_table = nozomi_pci_tbl,
1800 	.probe = nozomi_card_init,
1801 	.remove = nozomi_card_exit,
1802 };
1803 
nozomi_init(void)1804 static __init int nozomi_init(void)
1805 {
1806 	int ret;
1807 
1808 	ntty_driver = tty_alloc_driver(NTTY_TTY_MAXMINORS, TTY_DRIVER_REAL_RAW |
1809 			TTY_DRIVER_DYNAMIC_DEV);
1810 	if (IS_ERR(ntty_driver))
1811 		return PTR_ERR(ntty_driver);
1812 
1813 	ntty_driver->driver_name = NOZOMI_NAME_TTY;
1814 	ntty_driver->name = "noz";
1815 	ntty_driver->major = 0;
1816 	ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1817 	ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1818 	ntty_driver->init_termios = tty_std_termios;
1819 	ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1820 						HUPCL | CLOCAL;
1821 	ntty_driver->init_termios.c_ispeed = 115200;
1822 	ntty_driver->init_termios.c_ospeed = 115200;
1823 	tty_set_operations(ntty_driver, &tty_ops);
1824 
1825 	ret = tty_register_driver(ntty_driver);
1826 	if (ret) {
1827 		printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1828 		goto free_tty;
1829 	}
1830 
1831 	ret = pci_register_driver(&nozomi_driver);
1832 	if (ret) {
1833 		printk(KERN_ERR "Nozomi: can't register pci driver\n");
1834 		goto unr_tty;
1835 	}
1836 
1837 	return 0;
1838 unr_tty:
1839 	tty_unregister_driver(ntty_driver);
1840 free_tty:
1841 	tty_driver_kref_put(ntty_driver);
1842 	return ret;
1843 }
1844 
nozomi_exit(void)1845 static __exit void nozomi_exit(void)
1846 {
1847 	pci_unregister_driver(&nozomi_driver);
1848 	tty_unregister_driver(ntty_driver);
1849 	tty_driver_kref_put(ntty_driver);
1850 }
1851 
1852 module_init(nozomi_init);
1853 module_exit(nozomi_exit);
1854 
1855 MODULE_LICENSE("Dual BSD/GPL");
1856 MODULE_DESCRIPTION("Nozomi driver");
1857