Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/tty/nozomi.c

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

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