1 /*
2  * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
3  *
4  * Written by: Ulf Jakobsson,
5  *             Jan Åkerfeldt,
6  *             Stefan Thomasson,
7  *
8  * Maintained by: Paul Hardwick (p.hardwick@option.com)
9  *
10  * Patches:
11  *          Locking code changes for Vodafone by Sphere Systems Ltd,
12  *                              Andrew Bird (ajb@spheresystems.co.uk )
13  *                              & Phil Sanderson
14  *
15  * Source has been ported from an implementation made by Filip Aben @ Option
16  *
17  * --------------------------------------------------------------------------
18  *
19  * Copyright (c) 2005,2006 Option Wireless Sweden AB
20  * Copyright (c) 2006 Sphere Systems Ltd
21  * Copyright (c) 2006 Option Wireless n/v
22  * All rights Reserved.
23  *
24  * This program is free software; you can redistribute it and/or modify
25  * it under the terms of the GNU General Public License as published by
26  * the Free Software Foundation; either version 2 of the License, or
27  * (at your option) any later version.
28  *
29  * This program is distributed in the hope that it will be useful,
30  * but WITHOUT ANY WARRANTY; without even the implied warranty of
31  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
32  * GNU General Public License for more details.
33  *
34  * You should have received a copy of the GNU General Public License
35  * along with this program; if not, write to the Free Software
36  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
37  *
38  * --------------------------------------------------------------------------
39  */
40 
41 /* Enable this to have a lot of debug printouts */
42 #define DEBUG
43 
44 #include <linux/kernel.h>
45 #include <linux/module.h>
46 #include <linux/pci.h>
47 #include <linux/ioport.h>
48 #include <linux/tty.h>
49 #include <linux/tty_driver.h>
50 #include <linux/tty_flip.h>
51 #include <linux/sched.h>
52 #include <linux/serial.h>
53 #include <linux/interrupt.h>
54 #include <linux/kmod.h>
55 #include <linux/init.h>
56 #include <linux/kfifo.h>
57 #include <linux/uaccess.h>
58 #include <linux/slab.h>
59 #include <asm/byteorder.h>
60 
61 #include <linux/delay.h>
62 
63 
64 #define VERSION_STRING DRIVER_DESC " 2.1d"
65 
66 /*    Macros definitions */
67 
68 /* Default debug printout level */
69 #define NOZOMI_DEBUG_LEVEL 0x00
70 
71 #define P_BUF_SIZE 128
72 #define NFO(_err_flag_, args...)				\
73 do {								\
74 	char tmp[P_BUF_SIZE];					\
75 	snprintf(tmp, sizeof(tmp), ##args);			\
76 	printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,		\
77 		__func__, tmp);				\
78 } while (0)
79 
80 #define DBG1(args...) D_(0x01, ##args)
81 #define DBG2(args...) D_(0x02, ##args)
82 #define DBG3(args...) D_(0x04, ##args)
83 #define DBG4(args...) D_(0x08, ##args)
84 #define DBG5(args...) D_(0x10, ##args)
85 #define DBG6(args...) D_(0x20, ##args)
86 #define DBG7(args...) D_(0x40, ##args)
87 #define DBG8(args...) D_(0x80, ##args)
88 
89 #ifdef DEBUG
90 /* Do we need this settable at runtime? */
91 static int debug = NOZOMI_DEBUG_LEVEL;
92 
93 #define D(lvl, args...)  do \
94 			{if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
95 			while (0)
96 #define D_(lvl, args...) D(lvl, ##args)
97 
98 /* These printouts are always printed */
99 
100 #else
101 static int debug;
102 #define D_(lvl, args...)
103 #endif
104 
105 /* TODO: rewrite to optimize macros... */
106 
107 #define TMP_BUF_MAX 256
108 
109 #define DUMP(buf__,len__) \
110   do {  \
111     char tbuf[TMP_BUF_MAX] = {0};\
112     if (len__ > 1) {\
113 	snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
114 	if (tbuf[len__-2] == '\r') {\
115 		tbuf[len__-2] = 'r';\
116 	} \
117 	DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
118     } else {\
119 	DBG1("SENDING: '%s' (%d)", tbuf, len__);\
120     } \
121 } while (0)
122 
123 /*    Defines */
124 #define NOZOMI_NAME		"nozomi"
125 #define NOZOMI_NAME_TTY		"nozomi_tty"
126 #define DRIVER_DESC		"Nozomi driver"
127 
128 #define NTTY_TTY_MAXMINORS	256
129 #define NTTY_FIFO_BUFFER_SIZE	8192
130 
131 /* Must be power of 2 */
132 #define FIFO_BUFFER_SIZE_UL	8192
133 
134 /* Size of tmp send buffer to card */
135 #define SEND_BUF_MAX		1024
136 #define RECEIVE_BUF_MAX		4
137 
138 
139 #define R_IIR		0x0000	/* Interrupt Identity Register */
140 #define R_FCR		0x0000	/* Flow Control Register */
141 #define R_IER		0x0004	/* Interrupt Enable Register */
142 
143 #define CONFIG_MAGIC	0xEFEFFEFE
144 #define TOGGLE_VALID	0x0000
145 
146 /* Definition of interrupt tokens */
147 #define MDM_DL1		0x0001
148 #define MDM_UL1		0x0002
149 #define MDM_DL2		0x0004
150 #define MDM_UL2		0x0008
151 #define DIAG_DL1	0x0010
152 #define DIAG_DL2	0x0020
153 #define DIAG_UL		0x0040
154 #define APP1_DL		0x0080
155 #define APP1_UL		0x0100
156 #define APP2_DL		0x0200
157 #define APP2_UL		0x0400
158 #define CTRL_DL		0x0800
159 #define CTRL_UL		0x1000
160 #define RESET		0x8000
161 
162 #define MDM_DL		(MDM_DL1  | MDM_DL2)
163 #define MDM_UL		(MDM_UL1  | MDM_UL2)
164 #define DIAG_DL		(DIAG_DL1 | DIAG_DL2)
165 
166 /* modem signal definition */
167 #define CTRL_DSR	0x0001
168 #define CTRL_DCD	0x0002
169 #define CTRL_RI		0x0004
170 #define CTRL_CTS	0x0008
171 
172 #define CTRL_DTR	0x0001
173 #define CTRL_RTS	0x0002
174 
175 #define MAX_PORT		4
176 #define NOZOMI_MAX_PORTS	5
177 #define NOZOMI_MAX_CARDS	(NTTY_TTY_MAXMINORS / MAX_PORT)
178 
179 /*    Type definitions */
180 
181 /*
182  * There are two types of nozomi cards,
183  * one with 2048 memory and with 8192 memory
184  */
185 enum card_type {
186 	F32_2 = 2048,	/* 512 bytes downlink + uplink * 2 -> 2048 */
187 	F32_8 = 8192,	/* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
188 };
189 
190 /* Initialization states a card can be in */
191 enum card_state {
192 	NOZOMI_STATE_UKNOWN	= 0,
193 	NOZOMI_STATE_ENABLED	= 1,	/* pci device enabled */
194 	NOZOMI_STATE_ALLOCATED	= 2,	/* config setup done */
195 	NOZOMI_STATE_READY	= 3,	/* flowcontrols received */
196 };
197 
198 /* Two different toggle channels exist */
199 enum channel_type {
200 	CH_A = 0,
201 	CH_B = 1,
202 };
203 
204 /* Port definition for the card regarding flow control */
205 enum ctrl_port_type {
206 	CTRL_CMD	= 0,
207 	CTRL_MDM	= 1,
208 	CTRL_DIAG	= 2,
209 	CTRL_APP1	= 3,
210 	CTRL_APP2	= 4,
211 	CTRL_ERROR	= -1,
212 };
213 
214 /* Ports that the nozomi has */
215 enum port_type {
216 	PORT_MDM	= 0,
217 	PORT_DIAG	= 1,
218 	PORT_APP1	= 2,
219 	PORT_APP2	= 3,
220 	PORT_CTRL	= 4,
221 	PORT_ERROR	= -1,
222 };
223 
224 #ifdef __BIG_ENDIAN
225 /* Big endian */
226 
227 struct toggles {
228 	unsigned int enabled:5;	/*
229 				 * Toggle fields are valid if enabled is 0,
230 				 * else A-channels must always be used.
231 				 */
232 	unsigned int diag_dl:1;
233 	unsigned int mdm_dl:1;
234 	unsigned int mdm_ul:1;
235 } __attribute__ ((packed));
236 
237 /* Configuration table to read at startup of card */
238 /* Is for now only needed during initialization phase */
239 struct config_table {
240 	u32 signature;
241 	u16 product_information;
242 	u16 version;
243 	u8 pad3[3];
244 	struct toggles toggle;
245 	u8 pad1[4];
246 	u16 dl_mdm_len1;	/*
247 				 * If this is 64, it can hold
248 				 * 60 bytes + 4 that is length field
249 				 */
250 	u16 dl_start;
251 
252 	u16 dl_diag_len1;
253 	u16 dl_mdm_len2;	/*
254 				 * If this is 64, it can hold
255 				 * 60 bytes + 4 that is length field
256 				 */
257 	u16 dl_app1_len;
258 
259 	u16 dl_diag_len2;
260 	u16 dl_ctrl_len;
261 	u16 dl_app2_len;
262 	u8 pad2[16];
263 	u16 ul_mdm_len1;
264 	u16 ul_start;
265 	u16 ul_diag_len;
266 	u16 ul_mdm_len2;
267 	u16 ul_app1_len;
268 	u16 ul_app2_len;
269 	u16 ul_ctrl_len;
270 } __attribute__ ((packed));
271 
272 /* This stores all control downlink flags */
273 struct ctrl_dl {
274 	u8 port;
275 	unsigned int reserved:4;
276 	unsigned int CTS:1;
277 	unsigned int RI:1;
278 	unsigned int DCD:1;
279 	unsigned int DSR:1;
280 } __attribute__ ((packed));
281 
282 /* This stores all control uplink flags */
283 struct ctrl_ul {
284 	u8 port;
285 	unsigned int reserved:6;
286 	unsigned int RTS:1;
287 	unsigned int DTR:1;
288 } __attribute__ ((packed));
289 
290 #else
291 /* Little endian */
292 
293 /* This represents the toggle information */
294 struct toggles {
295 	unsigned int mdm_ul:1;
296 	unsigned int mdm_dl:1;
297 	unsigned int diag_dl:1;
298 	unsigned int enabled:5;	/*
299 				 * Toggle fields are valid if enabled is 0,
300 				 * else A-channels must always be used.
301 				 */
302 } __attribute__ ((packed));
303 
304 /* Configuration table to read at startup of card */
305 struct config_table {
306 	u32 signature;
307 	u16 version;
308 	u16 product_information;
309 	struct toggles toggle;
310 	u8 pad1[7];
311 	u16 dl_start;
312 	u16 dl_mdm_len1;	/*
313 				 * If this is 64, it can hold
314 				 * 60 bytes + 4 that is length field
315 				 */
316 	u16 dl_mdm_len2;
317 	u16 dl_diag_len1;
318 	u16 dl_diag_len2;
319 	u16 dl_app1_len;
320 	u16 dl_app2_len;
321 	u16 dl_ctrl_len;
322 	u8 pad2[16];
323 	u16 ul_start;
324 	u16 ul_mdm_len2;
325 	u16 ul_mdm_len1;
326 	u16 ul_diag_len;
327 	u16 ul_app1_len;
328 	u16 ul_app2_len;
329 	u16 ul_ctrl_len;
330 } __attribute__ ((packed));
331 
332 /* This stores all control downlink flags */
333 struct ctrl_dl {
334 	unsigned int DSR:1;
335 	unsigned int DCD:1;
336 	unsigned int RI:1;
337 	unsigned int CTS:1;
338 	unsigned int reserverd:4;
339 	u8 port;
340 } __attribute__ ((packed));
341 
342 /* This stores all control uplink flags */
343 struct ctrl_ul {
344 	unsigned int DTR:1;
345 	unsigned int RTS:1;
346 	unsigned int reserved:6;
347 	u8 port;
348 } __attribute__ ((packed));
349 #endif
350 
351 /* This holds all information that is needed regarding a port */
352 struct port {
353 	struct tty_port port;
354 	u8 update_flow_control;
355 	struct ctrl_ul ctrl_ul;
356 	struct ctrl_dl ctrl_dl;
357 	struct kfifo fifo_ul;
358 	void __iomem *dl_addr[2];
359 	u32 dl_size[2];
360 	u8 toggle_dl;
361 	void __iomem *ul_addr[2];
362 	u32 ul_size[2];
363 	u8 toggle_ul;
364 	u16 token_dl;
365 
366 	wait_queue_head_t tty_wait;
367 	struct async_icount tty_icount;
368 
369 	struct nozomi *dc;
370 };
371 
372 /* Private data one for each card in the system */
373 struct nozomi {
374 	void __iomem *base_addr;
375 	unsigned long flip;
376 
377 	/* Pointers to registers */
378 	void __iomem *reg_iir;
379 	void __iomem *reg_fcr;
380 	void __iomem *reg_ier;
381 
382 	u16 last_ier;
383 	enum card_type card_type;
384 	struct config_table config_table;	/* Configuration table */
385 	struct pci_dev *pdev;
386 	struct port port[NOZOMI_MAX_PORTS];
387 	u8 *send_buf;
388 
389 	spinlock_t spin_mutex;	/* secures access to registers and tty */
390 
391 	unsigned int index_start;
392 	enum card_state state;
393 	u32 open_ttys;
394 };
395 
396 /* This is a data packet that is read or written to/from card */
397 struct buffer {
398 	u32 size;		/* size is the length of the data buffer */
399 	u8 *data;
400 } __attribute__ ((packed));
401 
402 /*    Global variables */
403 static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
404 	{PCI_DEVICE(0x1931, 0x000c)},	/* Nozomi HSDPA */
405 	{},
406 };
407 
408 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
409 
410 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
411 static struct tty_driver *ntty_driver;
412 
413 static const struct tty_port_operations noz_tty_port_ops;
414 
415 /*
416  * find card by tty_index
417  */
get_dc_by_tty(const struct tty_struct * tty)418 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
419 {
420 	return tty ? ndevs[tty->index / MAX_PORT] : NULL;
421 }
422 
get_port_by_tty(const struct tty_struct * tty)423 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
424 {
425 	struct nozomi *ndev = get_dc_by_tty(tty);
426 	return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
427 }
428 
429 /*
430  * TODO:
431  * -Optimize
432  * -Rewrite cleaner
433  */
434 
read_mem32(u32 * buf,const void __iomem * mem_addr_start,u32 size_bytes)435 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
436 			u32 size_bytes)
437 {
438 	u32 i = 0;
439 	const u32 __iomem *ptr = mem_addr_start;
440 	u16 *buf16;
441 
442 	if (unlikely(!ptr || !buf))
443 		goto out;
444 
445 	/* shortcut for extremely often used cases */
446 	switch (size_bytes) {
447 	case 2:	/* 2 bytes */
448 		buf16 = (u16 *) buf;
449 		*buf16 = __le16_to_cpu(readw(ptr));
450 		goto out;
451 		break;
452 	case 4:	/* 4 bytes */
453 		*(buf) = __le32_to_cpu(readl(ptr));
454 		goto out;
455 		break;
456 	}
457 
458 	while (i < size_bytes) {
459 		if (size_bytes - i == 2) {
460 			/* Handle 2 bytes in the end */
461 			buf16 = (u16 *) buf;
462 			*(buf16) = __le16_to_cpu(readw(ptr));
463 			i += 2;
464 		} else {
465 			/* Read 4 bytes */
466 			*(buf) = __le32_to_cpu(readl(ptr));
467 			i += 4;
468 		}
469 		buf++;
470 		ptr++;
471 	}
472 out:
473 	return;
474 }
475 
476 /*
477  * TODO:
478  * -Optimize
479  * -Rewrite cleaner
480  */
write_mem32(void __iomem * mem_addr_start,const u32 * buf,u32 size_bytes)481 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
482 			u32 size_bytes)
483 {
484 	u32 i = 0;
485 	u32 __iomem *ptr = mem_addr_start;
486 	const u16 *buf16;
487 
488 	if (unlikely(!ptr || !buf))
489 		return 0;
490 
491 	/* shortcut for extremely often used cases */
492 	switch (size_bytes) {
493 	case 2:	/* 2 bytes */
494 		buf16 = (const u16 *)buf;
495 		writew(__cpu_to_le16(*buf16), ptr);
496 		return 2;
497 		break;
498 	case 1: /*
499 		 * also needs to write 4 bytes in this case
500 		 * so falling through..
501 		 */
502 	case 4: /* 4 bytes */
503 		writel(__cpu_to_le32(*buf), ptr);
504 		return 4;
505 		break;
506 	}
507 
508 	while (i < size_bytes) {
509 		if (size_bytes - i == 2) {
510 			/* 2 bytes */
511 			buf16 = (const u16 *)buf;
512 			writew(__cpu_to_le16(*buf16), ptr);
513 			i += 2;
514 		} else {
515 			/* 4 bytes */
516 			writel(__cpu_to_le32(*buf), ptr);
517 			i += 4;
518 		}
519 		buf++;
520 		ptr++;
521 	}
522 	return i;
523 }
524 
525 /* Setup pointers to different channels and also setup buffer sizes. */
setup_memory(struct nozomi * dc)526 static void setup_memory(struct nozomi *dc)
527 {
528 	void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
529 	/* The length reported is including the length field of 4 bytes,
530 	 * hence subtract with 4.
531 	 */
532 	const u16 buff_offset = 4;
533 
534 	/* Modem port dl configuration */
535 	dc->port[PORT_MDM].dl_addr[CH_A] = offset;
536 	dc->port[PORT_MDM].dl_addr[CH_B] =
537 				(offset += dc->config_table.dl_mdm_len1);
538 	dc->port[PORT_MDM].dl_size[CH_A] =
539 				dc->config_table.dl_mdm_len1 - buff_offset;
540 	dc->port[PORT_MDM].dl_size[CH_B] =
541 				dc->config_table.dl_mdm_len2 - buff_offset;
542 
543 	/* Diag port dl configuration */
544 	dc->port[PORT_DIAG].dl_addr[CH_A] =
545 				(offset += dc->config_table.dl_mdm_len2);
546 	dc->port[PORT_DIAG].dl_size[CH_A] =
547 				dc->config_table.dl_diag_len1 - buff_offset;
548 	dc->port[PORT_DIAG].dl_addr[CH_B] =
549 				(offset += dc->config_table.dl_diag_len1);
550 	dc->port[PORT_DIAG].dl_size[CH_B] =
551 				dc->config_table.dl_diag_len2 - buff_offset;
552 
553 	/* App1 port dl configuration */
554 	dc->port[PORT_APP1].dl_addr[CH_A] =
555 				(offset += dc->config_table.dl_diag_len2);
556 	dc->port[PORT_APP1].dl_size[CH_A] =
557 				dc->config_table.dl_app1_len - buff_offset;
558 
559 	/* App2 port dl configuration */
560 	dc->port[PORT_APP2].dl_addr[CH_A] =
561 				(offset += dc->config_table.dl_app1_len);
562 	dc->port[PORT_APP2].dl_size[CH_A] =
563 				dc->config_table.dl_app2_len - buff_offset;
564 
565 	/* Ctrl dl configuration */
566 	dc->port[PORT_CTRL].dl_addr[CH_A] =
567 				(offset += dc->config_table.dl_app2_len);
568 	dc->port[PORT_CTRL].dl_size[CH_A] =
569 				dc->config_table.dl_ctrl_len - buff_offset;
570 
571 	offset = dc->base_addr + dc->config_table.ul_start;
572 
573 	/* Modem Port ul configuration */
574 	dc->port[PORT_MDM].ul_addr[CH_A] = offset;
575 	dc->port[PORT_MDM].ul_size[CH_A] =
576 				dc->config_table.ul_mdm_len1 - buff_offset;
577 	dc->port[PORT_MDM].ul_addr[CH_B] =
578 				(offset += dc->config_table.ul_mdm_len1);
579 	dc->port[PORT_MDM].ul_size[CH_B] =
580 				dc->config_table.ul_mdm_len2 - buff_offset;
581 
582 	/* Diag port ul configuration */
583 	dc->port[PORT_DIAG].ul_addr[CH_A] =
584 				(offset += dc->config_table.ul_mdm_len2);
585 	dc->port[PORT_DIAG].ul_size[CH_A] =
586 				dc->config_table.ul_diag_len - buff_offset;
587 
588 	/* App1 port ul configuration */
589 	dc->port[PORT_APP1].ul_addr[CH_A] =
590 				(offset += dc->config_table.ul_diag_len);
591 	dc->port[PORT_APP1].ul_size[CH_A] =
592 				dc->config_table.ul_app1_len - buff_offset;
593 
594 	/* App2 port ul configuration */
595 	dc->port[PORT_APP2].ul_addr[CH_A] =
596 				(offset += dc->config_table.ul_app1_len);
597 	dc->port[PORT_APP2].ul_size[CH_A] =
598 				dc->config_table.ul_app2_len - buff_offset;
599 
600 	/* Ctrl ul configuration */
601 	dc->port[PORT_CTRL].ul_addr[CH_A] =
602 				(offset += dc->config_table.ul_app2_len);
603 	dc->port[PORT_CTRL].ul_size[CH_A] =
604 				dc->config_table.ul_ctrl_len - buff_offset;
605 }
606 
607 /* Dump config table under initalization phase */
608 #ifdef DEBUG
dump_table(const struct nozomi * dc)609 static void dump_table(const struct nozomi *dc)
610 {
611 	DBG3("signature: 0x%08X", dc->config_table.signature);
612 	DBG3("version: 0x%04X", dc->config_table.version);
613 	DBG3("product_information: 0x%04X", \
614 				dc->config_table.product_information);
615 	DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
616 	DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
617 	DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
618 	DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
619 
620 	DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
621 	DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
622 	   dc->config_table.dl_mdm_len1);
623 	DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
624 	   dc->config_table.dl_mdm_len2);
625 	DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
626 	   dc->config_table.dl_diag_len1);
627 	DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
628 	   dc->config_table.dl_diag_len2);
629 	DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
630 	   dc->config_table.dl_app1_len);
631 	DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
632 	   dc->config_table.dl_app2_len);
633 	DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
634 	   dc->config_table.dl_ctrl_len);
635 	DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
636 	   dc->config_table.ul_start);
637 	DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
638 	   dc->config_table.ul_mdm_len1);
639 	DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
640 	   dc->config_table.ul_mdm_len2);
641 	DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
642 	   dc->config_table.ul_diag_len);
643 	DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
644 	   dc->config_table.ul_app1_len);
645 	DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
646 	   dc->config_table.ul_app2_len);
647 	DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
648 	   dc->config_table.ul_ctrl_len);
649 }
650 #else
dump_table(const struct nozomi * dc)651 static inline void dump_table(const struct nozomi *dc) { }
652 #endif
653 
654 /*
655  * Read configuration table from card under intalization phase
656  * Returns 1 if ok, else 0
657  */
nozomi_read_config_table(struct nozomi * dc)658 static int nozomi_read_config_table(struct nozomi *dc)
659 {
660 	read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
661 						sizeof(struct config_table));
662 
663 	if (dc->config_table.signature != CONFIG_MAGIC) {
664 		dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
665 			dc->config_table.signature, CONFIG_MAGIC);
666 		return 0;
667 	}
668 
669 	if ((dc->config_table.version == 0)
670 	    || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
671 		int i;
672 		DBG1("Second phase, configuring card");
673 
674 		setup_memory(dc);
675 
676 		dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
677 		dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
678 		dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
679 		DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
680 		   dc->port[PORT_MDM].toggle_ul,
681 		   dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
682 
683 		dump_table(dc);
684 
685 		for (i = PORT_MDM; i < MAX_PORT; i++) {
686 			memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
687 			memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
688 		}
689 
690 		/* Enable control channel */
691 		dc->last_ier = dc->last_ier | CTRL_DL;
692 		writew(dc->last_ier, dc->reg_ier);
693 
694 		dc->state = NOZOMI_STATE_ALLOCATED;
695 		dev_info(&dc->pdev->dev, "Initialization OK!\n");
696 		return 1;
697 	}
698 
699 	if ((dc->config_table.version > 0)
700 	    && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
701 		u32 offset = 0;
702 		DBG1("First phase: pushing upload buffers, clearing download");
703 
704 		dev_info(&dc->pdev->dev, "Version of card: %d\n",
705 			 dc->config_table.version);
706 
707 		/* Here we should disable all I/O over F32. */
708 		setup_memory(dc);
709 
710 		/*
711 		 * We should send ALL channel pair tokens back along
712 		 * with reset token
713 		 */
714 
715 		/* push upload modem buffers */
716 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
717 			(u32 *) &offset, 4);
718 		write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
719 			(u32 *) &offset, 4);
720 
721 		writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
722 
723 		DBG1("First phase done");
724 	}
725 
726 	return 1;
727 }
728 
729 /* Enable uplink interrupts  */
enable_transmit_ul(enum port_type port,struct nozomi * dc)730 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
731 {
732 	static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
733 
734 	if (port < NOZOMI_MAX_PORTS) {
735 		dc->last_ier |= mask[port];
736 		writew(dc->last_ier, dc->reg_ier);
737 	} else {
738 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
739 	}
740 }
741 
742 /* Disable uplink interrupts  */
disable_transmit_ul(enum port_type port,struct nozomi * dc)743 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
744 {
745 	static const u16 mask[] =
746 		{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
747 
748 	if (port < NOZOMI_MAX_PORTS) {
749 		dc->last_ier &= mask[port];
750 		writew(dc->last_ier, dc->reg_ier);
751 	} else {
752 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
753 	}
754 }
755 
756 /* Enable downlink interrupts */
enable_transmit_dl(enum port_type port,struct nozomi * dc)757 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
758 {
759 	static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
760 
761 	if (port < NOZOMI_MAX_PORTS) {
762 		dc->last_ier |= mask[port];
763 		writew(dc->last_ier, dc->reg_ier);
764 	} else {
765 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
766 	}
767 }
768 
769 /* Disable downlink interrupts */
disable_transmit_dl(enum port_type port,struct nozomi * dc)770 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
771 {
772 	static const u16 mask[] =
773 		{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
774 
775 	if (port < NOZOMI_MAX_PORTS) {
776 		dc->last_ier &= mask[port];
777 		writew(dc->last_ier, dc->reg_ier);
778 	} else {
779 		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
780 	}
781 }
782 
783 /*
784  * Return 1 - send buffer to card and ack.
785  * Return 0 - don't ack, don't send buffer to card.
786  */
send_data(enum port_type index,struct nozomi * dc)787 static int send_data(enum port_type index, struct nozomi *dc)
788 {
789 	u32 size = 0;
790 	struct port *port = &dc->port[index];
791 	const u8 toggle = port->toggle_ul;
792 	void __iomem *addr = port->ul_addr[toggle];
793 	const u32 ul_size = port->ul_size[toggle];
794 	struct tty_struct *tty = tty_port_tty_get(&port->port);
795 
796 	/* Get data from tty and place in buf for now */
797 	size = kfifo_out(&port->fifo_ul, dc->send_buf,
798 			   ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
799 
800 	if (size == 0) {
801 		DBG4("No more data to send, disable link:");
802 		tty_kref_put(tty);
803 		return 0;
804 	}
805 
806 	/* DUMP(buf, size); */
807 
808 	/* Write length + data */
809 	write_mem32(addr, (u32 *) &size, 4);
810 	write_mem32(addr + 4, (u32 *) dc->send_buf, size);
811 
812 	if (tty)
813 		tty_wakeup(tty);
814 
815 	tty_kref_put(tty);
816 	return 1;
817 }
818 
819 /* If all data has been read, return 1, else 0 */
receive_data(enum port_type index,struct nozomi * dc)820 static int receive_data(enum port_type index, struct nozomi *dc)
821 {
822 	u8 buf[RECEIVE_BUF_MAX] = { 0 };
823 	int size;
824 	u32 offset = 4;
825 	struct port *port = &dc->port[index];
826 	void __iomem *addr = port->dl_addr[port->toggle_dl];
827 	struct tty_struct *tty = tty_port_tty_get(&port->port);
828 	int i, ret;
829 
830 	if (unlikely(!tty)) {
831 		DBG1("tty not open for port: %d?", index);
832 		return 1;
833 	}
834 
835 	read_mem32((u32 *) &size, addr, 4);
836 	/*  DBG1( "%d bytes port: %d", size, index); */
837 
838 	if (test_bit(TTY_THROTTLED, &tty->flags)) {
839 		DBG1("No room in tty, don't read data, don't ack interrupt, "
840 			"disable interrupt");
841 
842 		/* disable interrupt in downlink... */
843 		disable_transmit_dl(index, dc);
844 		ret = 0;
845 		goto put;
846 	}
847 
848 	if (unlikely(size == 0)) {
849 		dev_err(&dc->pdev->dev, "size == 0?\n");
850 		ret = 1;
851 		goto put;
852 	}
853 
854 	while (size > 0) {
855 		read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
856 
857 		if (size == 1) {
858 			tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
859 			size = 0;
860 		} else if (size < RECEIVE_BUF_MAX) {
861 			size -= tty_insert_flip_string(tty, (char *) buf, size);
862 		} else {
863 			i = tty_insert_flip_string(tty, \
864 						(char *) buf, RECEIVE_BUF_MAX);
865 			size -= i;
866 			offset += i;
867 		}
868 	}
869 
870 	set_bit(index, &dc->flip);
871 	ret = 1;
872 put:
873 	tty_kref_put(tty);
874 	return ret;
875 }
876 
877 /* Debug for interrupts */
878 #ifdef DEBUG
interrupt2str(u16 interrupt)879 static char *interrupt2str(u16 interrupt)
880 {
881 	static char buf[TMP_BUF_MAX];
882 	char *p = buf;
883 
884 	interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
885 	interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
886 					"MDM_DL2 ") : NULL;
887 
888 	interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
889 					"MDM_UL1 ") : NULL;
890 	interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
891 					"MDM_UL2 ") : NULL;
892 
893 	interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
894 					"DIAG_DL1 ") : NULL;
895 	interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
896 					"DIAG_DL2 ") : NULL;
897 
898 	interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
899 					"DIAG_UL ") : NULL;
900 
901 	interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
902 					"APP1_DL ") : NULL;
903 	interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
904 					"APP2_DL ") : NULL;
905 
906 	interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
907 					"APP1_UL ") : NULL;
908 	interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
909 					"APP2_UL ") : NULL;
910 
911 	interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
912 					"CTRL_DL ") : NULL;
913 	interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
914 					"CTRL_UL ") : NULL;
915 
916 	interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
917 					"RESET ") : NULL;
918 
919 	return buf;
920 }
921 #endif
922 
923 /*
924  * Receive flow control
925  * Return 1 - If ok, else 0
926  */
receive_flow_control(struct nozomi * dc)927 static int receive_flow_control(struct nozomi *dc)
928 {
929 	enum port_type port = PORT_MDM;
930 	struct ctrl_dl ctrl_dl;
931 	struct ctrl_dl old_ctrl;
932 	u16 enable_ier = 0;
933 
934 	read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
935 
936 	switch (ctrl_dl.port) {
937 	case CTRL_CMD:
938 		DBG1("The Base Band sends this value as a response to a "
939 			"request for IMSI detach sent over the control "
940 			"channel uplink (see section 7.6.1).");
941 		break;
942 	case CTRL_MDM:
943 		port = PORT_MDM;
944 		enable_ier = MDM_DL;
945 		break;
946 	case CTRL_DIAG:
947 		port = PORT_DIAG;
948 		enable_ier = DIAG_DL;
949 		break;
950 	case CTRL_APP1:
951 		port = PORT_APP1;
952 		enable_ier = APP1_DL;
953 		break;
954 	case CTRL_APP2:
955 		port = PORT_APP2;
956 		enable_ier = APP2_DL;
957 		if (dc->state == NOZOMI_STATE_ALLOCATED) {
958 			/*
959 			 * After card initialization the flow control
960 			 * received for APP2 is always the last
961 			 */
962 			dc->state = NOZOMI_STATE_READY;
963 			dev_info(&dc->pdev->dev, "Device READY!\n");
964 		}
965 		break;
966 	default:
967 		dev_err(&dc->pdev->dev,
968 			"ERROR: flow control received for non-existing port\n");
969 		return 0;
970 	};
971 
972 	DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
973 	   *((u16 *)&ctrl_dl));
974 
975 	old_ctrl = dc->port[port].ctrl_dl;
976 	dc->port[port].ctrl_dl = ctrl_dl;
977 
978 	if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
979 		DBG1("Disable interrupt (0x%04X) on port: %d",
980 			enable_ier, port);
981 		disable_transmit_ul(port, dc);
982 
983 	} else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
984 
985 		if (kfifo_len(&dc->port[port].fifo_ul)) {
986 			DBG1("Enable interrupt (0x%04X) on port: %d",
987 				enable_ier, port);
988 			DBG1("Data in buffer [%d], enable transmit! ",
989 				kfifo_len(&dc->port[port].fifo_ul));
990 			enable_transmit_ul(port, dc);
991 		} else {
992 			DBG1("No data in buffer...");
993 		}
994 	}
995 
996 	if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
997 		DBG1(" No change in mctrl");
998 		return 1;
999 	}
1000 	/* Update statistics */
1001 	if (old_ctrl.CTS != ctrl_dl.CTS)
1002 		dc->port[port].tty_icount.cts++;
1003 	if (old_ctrl.DSR != ctrl_dl.DSR)
1004 		dc->port[port].tty_icount.dsr++;
1005 	if (old_ctrl.RI != ctrl_dl.RI)
1006 		dc->port[port].tty_icount.rng++;
1007 	if (old_ctrl.DCD != ctrl_dl.DCD)
1008 		dc->port[port].tty_icount.dcd++;
1009 
1010 	wake_up_interruptible(&dc->port[port].tty_wait);
1011 
1012 	DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1013 	   port,
1014 	   dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1015 	   dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1016 
1017 	return 1;
1018 }
1019 
port2ctrl(enum port_type port,const struct nozomi * dc)1020 static enum ctrl_port_type port2ctrl(enum port_type port,
1021 					const struct nozomi *dc)
1022 {
1023 	switch (port) {
1024 	case PORT_MDM:
1025 		return CTRL_MDM;
1026 	case PORT_DIAG:
1027 		return CTRL_DIAG;
1028 	case PORT_APP1:
1029 		return CTRL_APP1;
1030 	case PORT_APP2:
1031 		return CTRL_APP2;
1032 	default:
1033 		dev_err(&dc->pdev->dev,
1034 			"ERROR: send flow control " \
1035 			"received for non-existing port\n");
1036 	};
1037 	return CTRL_ERROR;
1038 }
1039 
1040 /*
1041  * Send flow control, can only update one channel at a time
1042  * Return 0 - If we have updated all flow control
1043  * Return 1 - If we need to update more flow control, ack current enable more
1044  */
send_flow_control(struct nozomi * dc)1045 static int send_flow_control(struct nozomi *dc)
1046 {
1047 	u32 i, more_flow_control_to_be_updated = 0;
1048 	u16 *ctrl;
1049 
1050 	for (i = PORT_MDM; i < MAX_PORT; i++) {
1051 		if (dc->port[i].update_flow_control) {
1052 			if (more_flow_control_to_be_updated) {
1053 				/* We have more flow control to be updated */
1054 				return 1;
1055 			}
1056 			dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1057 			ctrl = (u16 *)&dc->port[i].ctrl_ul;
1058 			write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1059 				(u32 *) ctrl, 2);
1060 			dc->port[i].update_flow_control = 0;
1061 			more_flow_control_to_be_updated = 1;
1062 		}
1063 	}
1064 	return 0;
1065 }
1066 
1067 /*
1068  * Handle downlink data, ports that are handled are modem and diagnostics
1069  * Return 1 - ok
1070  * Return 0 - toggle fields are out of sync
1071  */
handle_data_dl(struct nozomi * dc,enum port_type port,u8 * toggle,u16 read_iir,u16 mask1,u16 mask2)1072 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1073 			u16 read_iir, u16 mask1, u16 mask2)
1074 {
1075 	if (*toggle == 0 && read_iir & mask1) {
1076 		if (receive_data(port, dc)) {
1077 			writew(mask1, dc->reg_fcr);
1078 			*toggle = !(*toggle);
1079 		}
1080 
1081 		if (read_iir & mask2) {
1082 			if (receive_data(port, dc)) {
1083 				writew(mask2, dc->reg_fcr);
1084 				*toggle = !(*toggle);
1085 			}
1086 		}
1087 	} else if (*toggle == 1 && read_iir & mask2) {
1088 		if (receive_data(port, dc)) {
1089 			writew(mask2, dc->reg_fcr);
1090 			*toggle = !(*toggle);
1091 		}
1092 
1093 		if (read_iir & mask1) {
1094 			if (receive_data(port, dc)) {
1095 				writew(mask1, dc->reg_fcr);
1096 				*toggle = !(*toggle);
1097 			}
1098 		}
1099 	} else {
1100 		dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1101 			*toggle);
1102 		return 0;
1103 	}
1104 	return 1;
1105 }
1106 
1107 /*
1108  * Handle uplink data, this is currently for the modem port
1109  * Return 1 - ok
1110  * Return 0 - toggle field are out of sync
1111  */
handle_data_ul(struct nozomi * dc,enum port_type port,u16 read_iir)1112 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1113 {
1114 	u8 *toggle = &(dc->port[port].toggle_ul);
1115 
1116 	if (*toggle == 0 && read_iir & MDM_UL1) {
1117 		dc->last_ier &= ~MDM_UL;
1118 		writew(dc->last_ier, dc->reg_ier);
1119 		if (send_data(port, dc)) {
1120 			writew(MDM_UL1, dc->reg_fcr);
1121 			dc->last_ier = dc->last_ier | MDM_UL;
1122 			writew(dc->last_ier, dc->reg_ier);
1123 			*toggle = !*toggle;
1124 		}
1125 
1126 		if (read_iir & MDM_UL2) {
1127 			dc->last_ier &= ~MDM_UL;
1128 			writew(dc->last_ier, dc->reg_ier);
1129 			if (send_data(port, dc)) {
1130 				writew(MDM_UL2, dc->reg_fcr);
1131 				dc->last_ier = dc->last_ier | MDM_UL;
1132 				writew(dc->last_ier, dc->reg_ier);
1133 				*toggle = !*toggle;
1134 			}
1135 		}
1136 
1137 	} else if (*toggle == 1 && read_iir & MDM_UL2) {
1138 		dc->last_ier &= ~MDM_UL;
1139 		writew(dc->last_ier, dc->reg_ier);
1140 		if (send_data(port, dc)) {
1141 			writew(MDM_UL2, dc->reg_fcr);
1142 			dc->last_ier = dc->last_ier | MDM_UL;
1143 			writew(dc->last_ier, dc->reg_ier);
1144 			*toggle = !*toggle;
1145 		}
1146 
1147 		if (read_iir & MDM_UL1) {
1148 			dc->last_ier &= ~MDM_UL;
1149 			writew(dc->last_ier, dc->reg_ier);
1150 			if (send_data(port, dc)) {
1151 				writew(MDM_UL1, dc->reg_fcr);
1152 				dc->last_ier = dc->last_ier | MDM_UL;
1153 				writew(dc->last_ier, dc->reg_ier);
1154 				*toggle = !*toggle;
1155 			}
1156 		}
1157 	} else {
1158 		writew(read_iir & MDM_UL, dc->reg_fcr);
1159 		dev_err(&dc->pdev->dev, "port out of sync!\n");
1160 		return 0;
1161 	}
1162 	return 1;
1163 }
1164 
interrupt_handler(int irq,void * dev_id)1165 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1166 {
1167 	struct nozomi *dc = dev_id;
1168 	unsigned int a;
1169 	u16 read_iir;
1170 
1171 	if (!dc)
1172 		return IRQ_NONE;
1173 
1174 	spin_lock(&dc->spin_mutex);
1175 	read_iir = readw(dc->reg_iir);
1176 
1177 	/* Card removed */
1178 	if (read_iir == (u16)-1)
1179 		goto none;
1180 	/*
1181 	 * Just handle interrupt enabled in IER
1182 	 * (by masking with dc->last_ier)
1183 	 */
1184 	read_iir &= dc->last_ier;
1185 
1186 	if (read_iir == 0)
1187 		goto none;
1188 
1189 
1190 	DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1191 		dc->last_ier);
1192 
1193 	if (read_iir & RESET) {
1194 		if (unlikely(!nozomi_read_config_table(dc))) {
1195 			dc->last_ier = 0x0;
1196 			writew(dc->last_ier, dc->reg_ier);
1197 			dev_err(&dc->pdev->dev, "Could not read status from "
1198 				"card, we should disable interface\n");
1199 		} else {
1200 			writew(RESET, dc->reg_fcr);
1201 		}
1202 		/* No more useful info if this was the reset interrupt. */
1203 		goto exit_handler;
1204 	}
1205 	if (read_iir & CTRL_UL) {
1206 		DBG1("CTRL_UL");
1207 		dc->last_ier &= ~CTRL_UL;
1208 		writew(dc->last_ier, dc->reg_ier);
1209 		if (send_flow_control(dc)) {
1210 			writew(CTRL_UL, dc->reg_fcr);
1211 			dc->last_ier = dc->last_ier | CTRL_UL;
1212 			writew(dc->last_ier, dc->reg_ier);
1213 		}
1214 	}
1215 	if (read_iir & CTRL_DL) {
1216 		receive_flow_control(dc);
1217 		writew(CTRL_DL, dc->reg_fcr);
1218 	}
1219 	if (read_iir & MDM_DL) {
1220 		if (!handle_data_dl(dc, PORT_MDM,
1221 				&(dc->port[PORT_MDM].toggle_dl), read_iir,
1222 				MDM_DL1, MDM_DL2)) {
1223 			dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1224 			goto exit_handler;
1225 		}
1226 	}
1227 	if (read_iir & MDM_UL) {
1228 		if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1229 			dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1230 			goto exit_handler;
1231 		}
1232 	}
1233 	if (read_iir & DIAG_DL) {
1234 		if (!handle_data_dl(dc, PORT_DIAG,
1235 				&(dc->port[PORT_DIAG].toggle_dl), read_iir,
1236 				DIAG_DL1, DIAG_DL2)) {
1237 			dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1238 			goto exit_handler;
1239 		}
1240 	}
1241 	if (read_iir & DIAG_UL) {
1242 		dc->last_ier &= ~DIAG_UL;
1243 		writew(dc->last_ier, dc->reg_ier);
1244 		if (send_data(PORT_DIAG, dc)) {
1245 			writew(DIAG_UL, dc->reg_fcr);
1246 			dc->last_ier = dc->last_ier | DIAG_UL;
1247 			writew(dc->last_ier, dc->reg_ier);
1248 		}
1249 	}
1250 	if (read_iir & APP1_DL) {
1251 		if (receive_data(PORT_APP1, dc))
1252 			writew(APP1_DL, dc->reg_fcr);
1253 	}
1254 	if (read_iir & APP1_UL) {
1255 		dc->last_ier &= ~APP1_UL;
1256 		writew(dc->last_ier, dc->reg_ier);
1257 		if (send_data(PORT_APP1, dc)) {
1258 			writew(APP1_UL, dc->reg_fcr);
1259 			dc->last_ier = dc->last_ier | APP1_UL;
1260 			writew(dc->last_ier, dc->reg_ier);
1261 		}
1262 	}
1263 	if (read_iir & APP2_DL) {
1264 		if (receive_data(PORT_APP2, dc))
1265 			writew(APP2_DL, dc->reg_fcr);
1266 	}
1267 	if (read_iir & APP2_UL) {
1268 		dc->last_ier &= ~APP2_UL;
1269 		writew(dc->last_ier, dc->reg_ier);
1270 		if (send_data(PORT_APP2, dc)) {
1271 			writew(APP2_UL, dc->reg_fcr);
1272 			dc->last_ier = dc->last_ier | APP2_UL;
1273 			writew(dc->last_ier, dc->reg_ier);
1274 		}
1275 	}
1276 
1277 exit_handler:
1278 	spin_unlock(&dc->spin_mutex);
1279 	for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
1280 		struct tty_struct *tty;
1281 		if (test_and_clear_bit(a, &dc->flip)) {
1282 			tty = tty_port_tty_get(&dc->port[a].port);
1283 			if (tty)
1284 				tty_flip_buffer_push(tty);
1285 			tty_kref_put(tty);
1286 		}
1287 	}
1288 	return IRQ_HANDLED;
1289 none:
1290 	spin_unlock(&dc->spin_mutex);
1291 	return IRQ_NONE;
1292 }
1293 
nozomi_get_card_type(struct nozomi * dc)1294 static void nozomi_get_card_type(struct nozomi *dc)
1295 {
1296 	int i;
1297 	u32 size = 0;
1298 
1299 	for (i = 0; i < 6; i++)
1300 		size += pci_resource_len(dc->pdev, i);
1301 
1302 	/* Assume card type F32_8 if no match */
1303 	dc->card_type = size == 2048 ? F32_2 : F32_8;
1304 
1305 	dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1306 }
1307 
nozomi_setup_private_data(struct nozomi * dc)1308 static void nozomi_setup_private_data(struct nozomi *dc)
1309 {
1310 	void __iomem *offset = dc->base_addr + dc->card_type / 2;
1311 	unsigned int i;
1312 
1313 	dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1314 	dc->reg_iir = (void __iomem *)(offset + R_IIR);
1315 	dc->reg_ier = (void __iomem *)(offset + R_IER);
1316 	dc->last_ier = 0;
1317 	dc->flip = 0;
1318 
1319 	dc->port[PORT_MDM].token_dl = MDM_DL;
1320 	dc->port[PORT_DIAG].token_dl = DIAG_DL;
1321 	dc->port[PORT_APP1].token_dl = APP1_DL;
1322 	dc->port[PORT_APP2].token_dl = APP2_DL;
1323 
1324 	for (i = 0; i < MAX_PORT; i++)
1325 		init_waitqueue_head(&dc->port[i].tty_wait);
1326 }
1327 
card_type_show(struct device * dev,struct device_attribute * attr,char * buf)1328 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1329 			  char *buf)
1330 {
1331 	const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1332 
1333 	return sprintf(buf, "%d\n", dc->card_type);
1334 }
1335 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1336 
open_ttys_show(struct device * dev,struct device_attribute * attr,char * buf)1337 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1338 			  char *buf)
1339 {
1340 	const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1341 
1342 	return sprintf(buf, "%u\n", dc->open_ttys);
1343 }
1344 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1345 
make_sysfs_files(struct nozomi * dc)1346 static void make_sysfs_files(struct nozomi *dc)
1347 {
1348 	if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1349 		dev_err(&dc->pdev->dev,
1350 			"Could not create sysfs file for card_type\n");
1351 	if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1352 		dev_err(&dc->pdev->dev,
1353 			"Could not create sysfs file for open_ttys\n");
1354 }
1355 
remove_sysfs_files(struct nozomi * dc)1356 static void remove_sysfs_files(struct nozomi *dc)
1357 {
1358 	device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1359 	device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1360 }
1361 
1362 /* Allocate memory for one device */
nozomi_card_init(struct pci_dev * pdev,const struct pci_device_id * ent)1363 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1364 				      const struct pci_device_id *ent)
1365 {
1366 	resource_size_t start;
1367 	int ret;
1368 	struct nozomi *dc = NULL;
1369 	int ndev_idx;
1370 	int i;
1371 
1372 	dev_dbg(&pdev->dev, "Init, new card found\n");
1373 
1374 	for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1375 		if (!ndevs[ndev_idx])
1376 			break;
1377 
1378 	if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1379 		dev_err(&pdev->dev, "no free tty range for this card left\n");
1380 		ret = -EIO;
1381 		goto err;
1382 	}
1383 
1384 	dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1385 	if (unlikely(!dc)) {
1386 		dev_err(&pdev->dev, "Could not allocate memory\n");
1387 		ret = -ENOMEM;
1388 		goto err_free;
1389 	}
1390 
1391 	dc->pdev = pdev;
1392 
1393 	ret = pci_enable_device(dc->pdev);
1394 	if (ret) {
1395 		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1396 		goto err_free;
1397 	}
1398 
1399 	ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1400 	if (ret) {
1401 		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1402 			(int) /* nozomi_private.io_addr */ 0);
1403 		goto err_disable_device;
1404 	}
1405 
1406 	start = pci_resource_start(dc->pdev, 0);
1407 	if (start == 0) {
1408 		dev_err(&pdev->dev, "No I/O address for card detected\n");
1409 		ret = -ENODEV;
1410 		goto err_rel_regs;
1411 	}
1412 
1413 	/* Find out what card type it is */
1414 	nozomi_get_card_type(dc);
1415 
1416 	dc->base_addr = ioremap_nocache(start, dc->card_type);
1417 	if (!dc->base_addr) {
1418 		dev_err(&pdev->dev, "Unable to map card MMIO\n");
1419 		ret = -ENODEV;
1420 		goto err_rel_regs;
1421 	}
1422 
1423 	dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1424 	if (!dc->send_buf) {
1425 		dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1426 		ret = -ENOMEM;
1427 		goto err_free_sbuf;
1428 	}
1429 
1430 	for (i = PORT_MDM; i < MAX_PORT; i++) {
1431 		if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1432 					GFP_KERNEL)) {
1433 			dev_err(&pdev->dev,
1434 					"Could not allocate kfifo buffer\n");
1435 			ret = -ENOMEM;
1436 			goto err_free_kfifo;
1437 		}
1438 	}
1439 
1440 	spin_lock_init(&dc->spin_mutex);
1441 
1442 	nozomi_setup_private_data(dc);
1443 
1444 	/* Disable all interrupts */
1445 	dc->last_ier = 0;
1446 	writew(dc->last_ier, dc->reg_ier);
1447 
1448 	ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1449 			NOZOMI_NAME, dc);
1450 	if (unlikely(ret)) {
1451 		dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1452 		goto err_free_kfifo;
1453 	}
1454 
1455 	DBG1("base_addr: %p", dc->base_addr);
1456 
1457 	make_sysfs_files(dc);
1458 
1459 	dc->index_start = ndev_idx * MAX_PORT;
1460 	ndevs[ndev_idx] = dc;
1461 
1462 	pci_set_drvdata(pdev, dc);
1463 
1464 	/* Enable RESET interrupt */
1465 	dc->last_ier = RESET;
1466 	iowrite16(dc->last_ier, dc->reg_ier);
1467 
1468 	dc->state = NOZOMI_STATE_ENABLED;
1469 
1470 	for (i = 0; i < MAX_PORT; i++) {
1471 		struct device *tty_dev;
1472 		struct port *port = &dc->port[i];
1473 		port->dc = dc;
1474 		tty_port_init(&port->port);
1475 		port->port.ops = &noz_tty_port_ops;
1476 		tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
1477 							&pdev->dev);
1478 
1479 		if (IS_ERR(tty_dev)) {
1480 			ret = PTR_ERR(tty_dev);
1481 			dev_err(&pdev->dev, "Could not allocate tty?\n");
1482 			goto err_free_tty;
1483 		}
1484 	}
1485 
1486 	return 0;
1487 
1488 err_free_tty:
1489 	for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1490 		tty_unregister_device(ntty_driver, i);
1491 err_free_kfifo:
1492 	for (i = 0; i < MAX_PORT; i++)
1493 		kfifo_free(&dc->port[i].fifo_ul);
1494 err_free_sbuf:
1495 	kfree(dc->send_buf);
1496 	iounmap(dc->base_addr);
1497 err_rel_regs:
1498 	pci_release_regions(pdev);
1499 err_disable_device:
1500 	pci_disable_device(pdev);
1501 err_free:
1502 	kfree(dc);
1503 err:
1504 	return ret;
1505 }
1506 
tty_exit(struct nozomi * dc)1507 static void __devexit tty_exit(struct nozomi *dc)
1508 {
1509 	unsigned int i;
1510 
1511 	DBG1(" ");
1512 
1513 	for (i = 0; i < MAX_PORT; ++i) {
1514 		struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
1515 		if (tty && list_empty(&tty->hangup_work.entry))
1516 			tty_hangup(tty);
1517 		tty_kref_put(tty);
1518 	}
1519 	/* Racy below - surely should wait for scheduled work to be done or
1520 	   complete off a hangup method ? */
1521 	while (dc->open_ttys)
1522 		msleep(1);
1523 	for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1524 		tty_unregister_device(ntty_driver, i);
1525 }
1526 
1527 /* Deallocate memory for one device */
nozomi_card_exit(struct pci_dev * pdev)1528 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1529 {
1530 	int i;
1531 	struct ctrl_ul ctrl;
1532 	struct nozomi *dc = pci_get_drvdata(pdev);
1533 
1534 	/* Disable all interrupts */
1535 	dc->last_ier = 0;
1536 	writew(dc->last_ier, dc->reg_ier);
1537 
1538 	tty_exit(dc);
1539 
1540 	/* Send 0x0001, command card to resend the reset token.  */
1541 	/* This is to get the reset when the module is reloaded. */
1542 	ctrl.port = 0x00;
1543 	ctrl.reserved = 0;
1544 	ctrl.RTS = 0;
1545 	ctrl.DTR = 1;
1546 	DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1547 
1548 	/* Setup dc->reg addresses to we can use defines here */
1549 	write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1550 	writew(CTRL_UL, dc->reg_fcr);	/* push the token to the card. */
1551 
1552 	remove_sysfs_files(dc);
1553 
1554 	free_irq(pdev->irq, dc);
1555 
1556 	for (i = 0; i < MAX_PORT; i++)
1557 		kfifo_free(&dc->port[i].fifo_ul);
1558 
1559 	kfree(dc->send_buf);
1560 
1561 	iounmap(dc->base_addr);
1562 
1563 	pci_release_regions(pdev);
1564 
1565 	pci_disable_device(pdev);
1566 
1567 	ndevs[dc->index_start / MAX_PORT] = NULL;
1568 
1569 	kfree(dc);
1570 }
1571 
set_rts(const struct tty_struct * tty,int rts)1572 static void set_rts(const struct tty_struct *tty, int rts)
1573 {
1574 	struct port *port = get_port_by_tty(tty);
1575 
1576 	port->ctrl_ul.RTS = rts;
1577 	port->update_flow_control = 1;
1578 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1579 }
1580 
set_dtr(const struct tty_struct * tty,int dtr)1581 static void set_dtr(const struct tty_struct *tty, int dtr)
1582 {
1583 	struct port *port = get_port_by_tty(tty);
1584 
1585 	DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1586 
1587 	port->ctrl_ul.DTR = dtr;
1588 	port->update_flow_control = 1;
1589 	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1590 }
1591 
1592 /*
1593  * ----------------------------------------------------------------------------
1594  * TTY code
1595  * ----------------------------------------------------------------------------
1596  */
1597 
ntty_install(struct tty_driver * driver,struct tty_struct * tty)1598 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1599 {
1600 	struct port *port = get_port_by_tty(tty);
1601 	struct nozomi *dc = get_dc_by_tty(tty);
1602 	int ret;
1603 	if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1604 		return -ENODEV;
1605 	ret = tty_standard_install(driver, tty);
1606 	if (ret == 0)
1607 		tty->driver_data = port;
1608 	return ret;
1609 }
1610 
ntty_cleanup(struct tty_struct * tty)1611 static void ntty_cleanup(struct tty_struct *tty)
1612 {
1613 	tty->driver_data = NULL;
1614 }
1615 
ntty_activate(struct tty_port * tport,struct tty_struct * tty)1616 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1617 {
1618 	struct port *port = container_of(tport, struct port, port);
1619 	struct nozomi *dc = port->dc;
1620 	unsigned long flags;
1621 
1622 	DBG1("open: %d", port->token_dl);
1623 	spin_lock_irqsave(&dc->spin_mutex, flags);
1624 	dc->last_ier = dc->last_ier | port->token_dl;
1625 	writew(dc->last_ier, dc->reg_ier);
1626 	dc->open_ttys++;
1627 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1628 	printk("noz: activated %d: %p\n", tty->index, tport);
1629 	return 0;
1630 }
1631 
ntty_open(struct tty_struct * tty,struct file * filp)1632 static int ntty_open(struct tty_struct *tty, struct file *filp)
1633 {
1634 	struct port *port = tty->driver_data;
1635 	return tty_port_open(&port->port, tty, filp);
1636 }
1637 
ntty_shutdown(struct tty_port * tport)1638 static void ntty_shutdown(struct tty_port *tport)
1639 {
1640 	struct port *port = container_of(tport, struct port, port);
1641 	struct nozomi *dc = port->dc;
1642 	unsigned long flags;
1643 
1644 	DBG1("close: %d", port->token_dl);
1645 	spin_lock_irqsave(&dc->spin_mutex, flags);
1646 	dc->last_ier &= ~(port->token_dl);
1647 	writew(dc->last_ier, dc->reg_ier);
1648 	dc->open_ttys--;
1649 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1650 	printk("noz: shutdown %p\n", tport);
1651 }
1652 
ntty_close(struct tty_struct * tty,struct file * filp)1653 static void ntty_close(struct tty_struct *tty, struct file *filp)
1654 {
1655 	struct port *port = tty->driver_data;
1656 	if (port)
1657 		tty_port_close(&port->port, tty, filp);
1658 }
1659 
ntty_hangup(struct tty_struct * tty)1660 static void ntty_hangup(struct tty_struct *tty)
1661 {
1662 	struct port *port = tty->driver_data;
1663 	tty_port_hangup(&port->port);
1664 }
1665 
1666 /*
1667  * called when the userspace process writes to the tty (/dev/noz*).
1668  * Data is inserted into a fifo, which is then read and transferred to the modem.
1669  */
ntty_write(struct tty_struct * tty,const unsigned char * buffer,int count)1670 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1671 		      int count)
1672 {
1673 	int rval = -EINVAL;
1674 	struct nozomi *dc = get_dc_by_tty(tty);
1675 	struct port *port = tty->driver_data;
1676 	unsigned long flags;
1677 
1678 	/* DBG1( "WRITEx: %d, index = %d", count, index); */
1679 
1680 	if (!dc || !port)
1681 		return -ENODEV;
1682 
1683 	rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1684 
1685 	/* notify card */
1686 	if (unlikely(dc == NULL)) {
1687 		DBG1("No device context?");
1688 		goto exit;
1689 	}
1690 
1691 	spin_lock_irqsave(&dc->spin_mutex, flags);
1692 	/* CTS is only valid on the modem channel */
1693 	if (port == &(dc->port[PORT_MDM])) {
1694 		if (port->ctrl_dl.CTS) {
1695 			DBG4("Enable interrupt");
1696 			enable_transmit_ul(tty->index % MAX_PORT, dc);
1697 		} else {
1698 			dev_err(&dc->pdev->dev,
1699 				"CTS not active on modem port?\n");
1700 		}
1701 	} else {
1702 		enable_transmit_ul(tty->index % MAX_PORT, dc);
1703 	}
1704 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1705 
1706 exit:
1707 	return rval;
1708 }
1709 
1710 /*
1711  * Calculate how much is left in device
1712  * This method is called by the upper tty layer.
1713  *   #according to sources N_TTY.c it expects a value >= 0 and
1714  *    does not check for negative values.
1715  *
1716  * If the port is unplugged report lots of room and let the bits
1717  * dribble away so we don't block anything.
1718  */
ntty_write_room(struct tty_struct * tty)1719 static int ntty_write_room(struct tty_struct *tty)
1720 {
1721 	struct port *port = tty->driver_data;
1722 	int room = 4096;
1723 	const struct nozomi *dc = get_dc_by_tty(tty);
1724 
1725 	if (dc)
1726 		room = kfifo_avail(&port->fifo_ul);
1727 
1728 	return room;
1729 }
1730 
1731 /* Gets io control parameters */
ntty_tiocmget(struct tty_struct * tty)1732 static int ntty_tiocmget(struct tty_struct *tty)
1733 {
1734 	const struct port *port = tty->driver_data;
1735 	const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1736 	const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1737 
1738 	/* Note: these could change under us but it is not clear this
1739 	   matters if so */
1740 	return	(ctrl_ul->RTS ? TIOCM_RTS : 0) |
1741 		(ctrl_ul->DTR ? TIOCM_DTR : 0) |
1742 		(ctrl_dl->DCD ? TIOCM_CAR : 0) |
1743 		(ctrl_dl->RI  ? TIOCM_RNG : 0) |
1744 		(ctrl_dl->DSR ? TIOCM_DSR : 0) |
1745 		(ctrl_dl->CTS ? TIOCM_CTS : 0);
1746 }
1747 
1748 /* Sets io controls parameters */
ntty_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1749 static int ntty_tiocmset(struct tty_struct *tty,
1750 					unsigned int set, unsigned int clear)
1751 {
1752 	struct nozomi *dc = get_dc_by_tty(tty);
1753 	unsigned long flags;
1754 
1755 	spin_lock_irqsave(&dc->spin_mutex, flags);
1756 	if (set & TIOCM_RTS)
1757 		set_rts(tty, 1);
1758 	else if (clear & TIOCM_RTS)
1759 		set_rts(tty, 0);
1760 
1761 	if (set & TIOCM_DTR)
1762 		set_dtr(tty, 1);
1763 	else if (clear & TIOCM_DTR)
1764 		set_dtr(tty, 0);
1765 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1766 
1767 	return 0;
1768 }
1769 
ntty_cflags_changed(struct port * port,unsigned long flags,struct async_icount * cprev)1770 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1771 		struct async_icount *cprev)
1772 {
1773 	const struct async_icount cnow = port->tty_icount;
1774 	int ret;
1775 
1776 	ret =	((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1777 		((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1778 		((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1779 		((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1780 
1781 	*cprev = cnow;
1782 
1783 	return ret;
1784 }
1785 
ntty_tiocgicount(struct tty_struct * tty,struct serial_icounter_struct * icount)1786 static int ntty_tiocgicount(struct tty_struct *tty,
1787 				struct serial_icounter_struct *icount)
1788 {
1789 	struct port *port = tty->driver_data;
1790 	const struct async_icount cnow = port->tty_icount;
1791 
1792 	icount->cts = cnow.cts;
1793 	icount->dsr = cnow.dsr;
1794 	icount->rng = cnow.rng;
1795 	icount->dcd = cnow.dcd;
1796 	icount->rx = cnow.rx;
1797 	icount->tx = cnow.tx;
1798 	icount->frame = cnow.frame;
1799 	icount->overrun = cnow.overrun;
1800 	icount->parity = cnow.parity;
1801 	icount->brk = cnow.brk;
1802 	icount->buf_overrun = cnow.buf_overrun;
1803 	return 0;
1804 }
1805 
ntty_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1806 static int ntty_ioctl(struct tty_struct *tty,
1807 		      unsigned int cmd, unsigned long arg)
1808 {
1809 	struct port *port = tty->driver_data;
1810 	int rval = -ENOIOCTLCMD;
1811 
1812 	DBG1("******** IOCTL, cmd: %d", cmd);
1813 
1814 	switch (cmd) {
1815 	case TIOCMIWAIT: {
1816 		struct async_icount cprev = port->tty_icount;
1817 
1818 		rval = wait_event_interruptible(port->tty_wait,
1819 				ntty_cflags_changed(port, arg, &cprev));
1820 		break;
1821 	}
1822 	default:
1823 		DBG1("ERR: 0x%08X, %d", cmd, cmd);
1824 		break;
1825 	};
1826 
1827 	return rval;
1828 }
1829 
1830 /*
1831  * Called by the upper tty layer when tty buffers are ready
1832  * to receive data again after a call to throttle.
1833  */
ntty_unthrottle(struct tty_struct * tty)1834 static void ntty_unthrottle(struct tty_struct *tty)
1835 {
1836 	struct nozomi *dc = get_dc_by_tty(tty);
1837 	unsigned long flags;
1838 
1839 	DBG1("UNTHROTTLE");
1840 	spin_lock_irqsave(&dc->spin_mutex, flags);
1841 	enable_transmit_dl(tty->index % MAX_PORT, dc);
1842 	set_rts(tty, 1);
1843 
1844 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1845 }
1846 
1847 /*
1848  * Called by the upper tty layer when the tty buffers are almost full.
1849  * The driver should stop send more data.
1850  */
ntty_throttle(struct tty_struct * tty)1851 static void ntty_throttle(struct tty_struct *tty)
1852 {
1853 	struct nozomi *dc = get_dc_by_tty(tty);
1854 	unsigned long flags;
1855 
1856 	DBG1("THROTTLE");
1857 	spin_lock_irqsave(&dc->spin_mutex, flags);
1858 	set_rts(tty, 0);
1859 	spin_unlock_irqrestore(&dc->spin_mutex, flags);
1860 }
1861 
1862 /* Returns number of chars in buffer, called by tty layer */
ntty_chars_in_buffer(struct tty_struct * tty)1863 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1864 {
1865 	struct port *port = tty->driver_data;
1866 	struct nozomi *dc = get_dc_by_tty(tty);
1867 	s32 rval = 0;
1868 
1869 	if (unlikely(!dc || !port)) {
1870 		goto exit_in_buffer;
1871 	}
1872 
1873 	rval = kfifo_len(&port->fifo_ul);
1874 
1875 exit_in_buffer:
1876 	return rval;
1877 }
1878 
1879 static const struct tty_port_operations noz_tty_port_ops = {
1880 	.activate = ntty_activate,
1881 	.shutdown = ntty_shutdown,
1882 };
1883 
1884 static const struct tty_operations tty_ops = {
1885 	.ioctl = ntty_ioctl,
1886 	.open = ntty_open,
1887 	.close = ntty_close,
1888 	.hangup = ntty_hangup,
1889 	.write = ntty_write,
1890 	.write_room = ntty_write_room,
1891 	.unthrottle = ntty_unthrottle,
1892 	.throttle = ntty_throttle,
1893 	.chars_in_buffer = ntty_chars_in_buffer,
1894 	.tiocmget = ntty_tiocmget,
1895 	.tiocmset = ntty_tiocmset,
1896 	.get_icount = ntty_tiocgicount,
1897 	.install = ntty_install,
1898 	.cleanup = ntty_cleanup,
1899 };
1900 
1901 /* Module initialization */
1902 static struct pci_driver nozomi_driver = {
1903 	.name = NOZOMI_NAME,
1904 	.id_table = nozomi_pci_tbl,
1905 	.probe = nozomi_card_init,
1906 	.remove = __devexit_p(nozomi_card_exit),
1907 };
1908 
nozomi_init(void)1909 static __init int nozomi_init(void)
1910 {
1911 	int ret;
1912 
1913 	printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1914 
1915 	ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1916 	if (!ntty_driver)
1917 		return -ENOMEM;
1918 
1919 	ntty_driver->driver_name = NOZOMI_NAME_TTY;
1920 	ntty_driver->name = "noz";
1921 	ntty_driver->major = 0;
1922 	ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1923 	ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1924 	ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1925 	ntty_driver->init_termios = tty_std_termios;
1926 	ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1927 						HUPCL | CLOCAL;
1928 	ntty_driver->init_termios.c_ispeed = 115200;
1929 	ntty_driver->init_termios.c_ospeed = 115200;
1930 	tty_set_operations(ntty_driver, &tty_ops);
1931 
1932 	ret = tty_register_driver(ntty_driver);
1933 	if (ret) {
1934 		printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1935 		goto free_tty;
1936 	}
1937 
1938 	ret = pci_register_driver(&nozomi_driver);
1939 	if (ret) {
1940 		printk(KERN_ERR "Nozomi: can't register pci driver\n");
1941 		goto unr_tty;
1942 	}
1943 
1944 	return 0;
1945 unr_tty:
1946 	tty_unregister_driver(ntty_driver);
1947 free_tty:
1948 	put_tty_driver(ntty_driver);
1949 	return ret;
1950 }
1951 
nozomi_exit(void)1952 static __exit void nozomi_exit(void)
1953 {
1954 	printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1955 	pci_unregister_driver(&nozomi_driver);
1956 	tty_unregister_driver(ntty_driver);
1957 	put_tty_driver(ntty_driver);
1958 }
1959 
1960 module_init(nozomi_init);
1961 module_exit(nozomi_exit);
1962 
1963 module_param(debug, int, S_IRUGO | S_IWUSR);
1964 
1965 MODULE_LICENSE("Dual BSD/GPL");
1966 MODULE_DESCRIPTION(DRIVER_DESC);
1967