Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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 /* Default debug printout level */
 67 #define NOZOMI_DEBUG_LEVEL 0x00
 68 static int debug = NOZOMI_DEBUG_LEVEL;
 69 module_param(debug, int, S_IRUGO | S_IWUSR);
 70 
 71 /*    Macros definitions */
 72 #define DBG_(lvl, fmt, args...)                         \
 73 do {                                                    \
 74         if (lvl & debug)                                \
 75                 pr_debug("[%d] %s(): " fmt "\n",        \
 76                          __LINE__, __func__,  ##args);  \
 77 } while (0)
 78 
 79 #define DBG1(args...) DBG_(0x01, ##args)
 80 #define DBG2(args...) DBG_(0x02, ##args)
 81 #define DBG3(args...) DBG_(0x04, ##args)
 82 #define DBG4(args...) DBG_(0x08, ##args)
 83 
 84 /* TODO: rewrite to optimize macros... */
 85 
 86 #define TMP_BUF_MAX 256
 87 
 88 #define DUMP(buf__,len__) \
 89   do {  \
 90     char tbuf[TMP_BUF_MAX] = {0};\
 91     if (len__ > 1) {\
 92         snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
 93         if (tbuf[len__-2] == '\r') {\
 94                 tbuf[len__-2] = 'r';\
 95         } \
 96         DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
 97     } else {\
 98         DBG1("SENDING: '%s' (%d)", tbuf, len__);\
 99     } \
100 } while (0)
101 
102 /*    Defines */
103 #define NOZOMI_NAME             "nozomi"
104 #define NOZOMI_NAME_TTY         "nozomi_tty"
105 #define DRIVER_DESC             "Nozomi driver"
106 
107 #define NTTY_TTY_MAXMINORS      256
108 #define NTTY_FIFO_BUFFER_SIZE   8192
109 
110 /* Must be power of 2 */
111 #define FIFO_BUFFER_SIZE_UL     8192
112 
113 /* Size of tmp send buffer to card */
114 #define SEND_BUF_MAX            1024
115 #define RECEIVE_BUF_MAX         4
116 
117 
118 #define R_IIR           0x0000  /* Interrupt Identity Register */
119 #define R_FCR           0x0000  /* Flow Control Register */
120 #define R_IER           0x0004  /* Interrupt Enable Register */
121 
122 #define NOZOMI_CONFIG_MAGIC     0xEFEFFEFE
123 #define TOGGLE_VALID            0x0000
124 
125 /* Definition of interrupt tokens */
126 #define MDM_DL1         0x0001
127 #define MDM_UL1         0x0002
128 #define MDM_DL2         0x0004
129 #define MDM_UL2         0x0008
130 #define DIAG_DL1        0x0010
131 #define DIAG_DL2        0x0020
132 #define DIAG_UL         0x0040
133 #define APP1_DL         0x0080
134 #define APP1_UL         0x0100
135 #define APP2_DL         0x0200
136 #define APP2_UL         0x0400
137 #define CTRL_DL         0x0800
138 #define CTRL_UL         0x1000
139 #define RESET           0x8000
140 
141 #define MDM_DL          (MDM_DL1  | MDM_DL2)
142 #define MDM_UL          (MDM_UL1  | MDM_UL2)
143 #define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
144 
145 /* modem signal definition */
146 #define CTRL_DSR        0x0001
147 #define CTRL_DCD        0x0002
148 #define CTRL_RI         0x0004
149 #define CTRL_CTS        0x0008
150 
151 #define CTRL_DTR        0x0001
152 #define CTRL_RTS        0x0002
153 
154 #define MAX_PORT                4
155 #define NOZOMI_MAX_PORTS        5
156 #define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
157 
158 /*    Type definitions */
159 
160 /*
161  * There are two types of nozomi cards,
162  * one with 2048 memory and with 8192 memory
163  */
164 enum card_type {
165         F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
166         F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
167 };
168 
169 /* Initialization states a card can be in */
170 enum card_state {
171         NOZOMI_STATE_UKNOWN     = 0,
172         NOZOMI_STATE_ENABLED    = 1,    /* pci device enabled */
173         NOZOMI_STATE_ALLOCATED  = 2,    /* config setup done */
174         NOZOMI_STATE_READY      = 3,    /* flowcontrols received */
175 };
176 
177 /* Two different toggle channels exist */
178 enum channel_type {
179         CH_A = 0,
180         CH_B = 1,
181 };
182 
183 /* Port definition for the card regarding flow control */
184 enum ctrl_port_type {
185         CTRL_CMD        = 0,
186         CTRL_MDM        = 1,
187         CTRL_DIAG       = 2,
188         CTRL_APP1       = 3,
189         CTRL_APP2       = 4,
190         CTRL_ERROR      = -1,
191 };
192 
193 /* Ports that the nozomi has */
194 enum port_type {
195         PORT_MDM        = 0,
196         PORT_DIAG       = 1,
197         PORT_APP1       = 2,
198         PORT_APP2       = 3,
199         PORT_CTRL       = 4,
200         PORT_ERROR      = -1,
201 };
202 
203 #ifdef __BIG_ENDIAN
204 /* Big endian */
205 
206 struct toggles {
207         unsigned int enabled:5; /*
208                                  * Toggle fields are valid if enabled is 0,
209                                  * else A-channels must always be used.
210                                  */
211         unsigned int diag_dl:1;
212         unsigned int mdm_dl:1;
213         unsigned int mdm_ul:1;
214 } __attribute__ ((packed));
215 
216 /* Configuration table to read at startup of card */
217 /* Is for now only needed during initialization phase */
218 struct config_table {
219         u32 signature;
220         u16 product_information;
221         u16 version;
222         u8 pad3[3];
223         struct toggles toggle;
224         u8 pad1[4];
225         u16 dl_mdm_len1;        /*
226                                  * If this is 64, it can hold
227                                  * 60 bytes + 4 that is length field
228                                  */
229         u16 dl_start;
230 
231         u16 dl_diag_len1;
232         u16 dl_mdm_len2;        /*
233                                  * If this is 64, it can hold
234                                  * 60 bytes + 4 that is length field
235                                  */
236         u16 dl_app1_len;
237 
238         u16 dl_diag_len2;
239         u16 dl_ctrl_len;
240         u16 dl_app2_len;
241         u8 pad2[16];
242         u16 ul_mdm_len1;
243         u16 ul_start;
244         u16 ul_diag_len;
245         u16 ul_mdm_len2;
246         u16 ul_app1_len;
247         u16 ul_app2_len;
248         u16 ul_ctrl_len;
249 } __attribute__ ((packed));
250 
251 /* This stores all control downlink flags */
252 struct ctrl_dl {
253         u8 port;
254         unsigned int reserved:4;
255         unsigned int CTS:1;
256         unsigned int RI:1;
257         unsigned int DCD:1;
258         unsigned int DSR:1;
259 } __attribute__ ((packed));
260 
261 /* This stores all control uplink flags */
262 struct ctrl_ul {
263         u8 port;
264         unsigned int reserved:6;
265         unsigned int RTS:1;
266         unsigned int DTR:1;
267 } __attribute__ ((packed));
268 
269 #else
270 /* Little endian */
271 
272 /* This represents the toggle information */
273 struct toggles {
274         unsigned int mdm_ul:1;
275         unsigned int mdm_dl:1;
276         unsigned int diag_dl:1;
277         unsigned int enabled:5; /*
278                                  * Toggle fields are valid if enabled is 0,
279                                  * else A-channels must always be used.
280                                  */
281 } __attribute__ ((packed));
282 
283 /* Configuration table to read at startup of card */
284 struct config_table {
285         u32 signature;
286         u16 version;
287         u16 product_information;
288         struct toggles toggle;
289         u8 pad1[7];
290         u16 dl_start;
291         u16 dl_mdm_len1;        /*
292                                  * If this is 64, it can hold
293                                  * 60 bytes + 4 that is length field
294                                  */
295         u16 dl_mdm_len2;
296         u16 dl_diag_len1;
297         u16 dl_diag_len2;
298         u16 dl_app1_len;
299         u16 dl_app2_len;
300         u16 dl_ctrl_len;
301         u8 pad2[16];
302         u16 ul_start;
303         u16 ul_mdm_len2;
304         u16 ul_mdm_len1;
305         u16 ul_diag_len;
306         u16 ul_app1_len;
307         u16 ul_app2_len;
308         u16 ul_ctrl_len;
309 } __attribute__ ((packed));
310 
311 /* This stores all control downlink flags */
312 struct ctrl_dl {
313         unsigned int DSR:1;
314         unsigned int DCD:1;
315         unsigned int RI:1;
316         unsigned int CTS:1;
317         unsigned int reserverd:4;
318         u8 port;
319 } __attribute__ ((packed));
320 
321 /* This stores all control uplink flags */
322 struct ctrl_ul {
323         unsigned int DTR:1;
324         unsigned int RTS:1;
325         unsigned int reserved:6;
326         u8 port;
327 } __attribute__ ((packed));
328 #endif
329 
330 /* This holds all information that is needed regarding a port */
331 struct port {
332         struct tty_port port;
333         u8 update_flow_control;
334         struct ctrl_ul ctrl_ul;
335         struct ctrl_dl ctrl_dl;
336         struct kfifo fifo_ul;
337         void __iomem *dl_addr[2];
338         u32 dl_size[2];
339         u8 toggle_dl;
340         void __iomem *ul_addr[2];
341         u32 ul_size[2];
342         u8 toggle_ul;
343         u16 token_dl;
344 
345         wait_queue_head_t tty_wait;
346         struct async_icount tty_icount;
347 
348         struct nozomi *dc;
349 };
350 
351 /* Private data one for each card in the system */
352 struct nozomi {
353         void __iomem *base_addr;
354         unsigned long flip;
355 
356         /* Pointers to registers */
357         void __iomem *reg_iir;
358         void __iomem *reg_fcr;
359         void __iomem *reg_ier;
360 
361         u16 last_ier;
362         enum card_type card_type;
363         struct config_table config_table;       /* Configuration table */
364         struct pci_dev *pdev;
365         struct port port[NOZOMI_MAX_PORTS];
366         u8 *send_buf;
367 
368         spinlock_t spin_mutex;  /* secures access to registers and tty */
369 
370         unsigned int index_start;
371         enum card_state state;
372         u32 open_ttys;
373 };
374 
375 /* This is a data packet that is read or written to/from card */
376 struct buffer {
377         u32 size;               /* size is the length of the data buffer */
378         u8 *data;
379 } __attribute__ ((packed));
380 
381 /*    Global variables */
382 static const struct pci_device_id nozomi_pci_tbl[] = {
383         {PCI_DEVICE(0x1931, 0x000c)},   /* Nozomi HSDPA */
384         {},
385 };
386 
387 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
388 
389 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
390 static struct tty_driver *ntty_driver;
391 
392 static const struct tty_port_operations noz_tty_port_ops;
393 
394 /*
395  * find card by tty_index
396  */
397 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
398 {
399         return tty ? ndevs[tty->index / MAX_PORT] : NULL;
400 }
401 
402 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
403 {
404         struct nozomi *ndev = get_dc_by_tty(tty);
405         return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
406 }
407 
408 /*
409  * TODO:
410  * -Optimize
411  * -Rewrite cleaner
412  */
413 
414 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
415                         u32 size_bytes)
416 {
417         u32 i = 0;
418         const u32 __iomem *ptr = mem_addr_start;
419         u16 *buf16;
420 
421         if (unlikely(!ptr || !buf))
422                 goto out;
423 
424         /* shortcut for extremely often used cases */
425         switch (size_bytes) {
426         case 2: /* 2 bytes */
427                 buf16 = (u16 *) buf;
428                 *buf16 = __le16_to_cpu(readw(ptr));
429                 goto out;
430                 break;
431         case 4: /* 4 bytes */
432                 *(buf) = __le32_to_cpu(readl(ptr));
433                 goto out;
434                 break;
435         }
436 
437         while (i < size_bytes) {
438                 if (size_bytes - i == 2) {
439                         /* Handle 2 bytes in the end */
440                         buf16 = (u16 *) buf;
441                         *(buf16) = __le16_to_cpu(readw(ptr));
442                         i += 2;
443                 } else {
444                         /* Read 4 bytes */
445                         *(buf) = __le32_to_cpu(readl(ptr));
446                         i += 4;
447                 }
448                 buf++;
449                 ptr++;
450         }
451 out:
452         return;
453 }
454 
455 /*
456  * TODO:
457  * -Optimize
458  * -Rewrite cleaner
459  */
460 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
461                         u32 size_bytes)
462 {
463         u32 i = 0;
464         u32 __iomem *ptr = mem_addr_start;
465         const u16 *buf16;
466 
467         if (unlikely(!ptr || !buf))
468                 return 0;
469 
470         /* shortcut for extremely often used cases */
471         switch (size_bytes) {
472         case 2: /* 2 bytes */
473                 buf16 = (const u16 *)buf;
474                 writew(__cpu_to_le16(*buf16), ptr);
475                 return 2;
476                 break;
477         case 1: /*
478                  * also needs to write 4 bytes in this case
479                  * so falling through..
480                  */
481         case 4: /* 4 bytes */
482                 writel(__cpu_to_le32(*buf), ptr);
483                 return 4;
484                 break;
485         }
486 
487         while (i < size_bytes) {
488                 if (size_bytes - i == 2) {
489                         /* 2 bytes */
490                         buf16 = (const u16 *)buf;
491                         writew(__cpu_to_le16(*buf16), ptr);
492                         i += 2;
493                 } else {
494                         /* 4 bytes */
495                         writel(__cpu_to_le32(*buf), ptr);
496                         i += 4;
497                 }
498                 buf++;
499                 ptr++;
500         }
501         return i;
502 }
503 
504 /* Setup pointers to different channels and also setup buffer sizes. */
505 static void nozomi_setup_memory(struct nozomi *dc)
506 {
507         void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
508         /* The length reported is including the length field of 4 bytes,
509          * hence subtract with 4.
510          */
511         const u16 buff_offset = 4;
512 
513         /* Modem port dl configuration */
514         dc->port[PORT_MDM].dl_addr[CH_A] = offset;
515         dc->port[PORT_MDM].dl_addr[CH_B] =
516                                 (offset += dc->config_table.dl_mdm_len1);
517         dc->port[PORT_MDM].dl_size[CH_A] =
518                                 dc->config_table.dl_mdm_len1 - buff_offset;
519         dc->port[PORT_MDM].dl_size[CH_B] =
520                                 dc->config_table.dl_mdm_len2 - buff_offset;
521 
522         /* Diag port dl configuration */
523         dc->port[PORT_DIAG].dl_addr[CH_A] =
524                                 (offset += dc->config_table.dl_mdm_len2);
525         dc->port[PORT_DIAG].dl_size[CH_A] =
526                                 dc->config_table.dl_diag_len1 - buff_offset;
527         dc->port[PORT_DIAG].dl_addr[CH_B] =
528                                 (offset += dc->config_table.dl_diag_len1);
529         dc->port[PORT_DIAG].dl_size[CH_B] =
530                                 dc->config_table.dl_diag_len2 - buff_offset;
531 
532         /* App1 port dl configuration */
533         dc->port[PORT_APP1].dl_addr[CH_A] =
534                                 (offset += dc->config_table.dl_diag_len2);
535         dc->port[PORT_APP1].dl_size[CH_A] =
536                                 dc->config_table.dl_app1_len - buff_offset;
537 
538         /* App2 port dl configuration */
539         dc->port[PORT_APP2].dl_addr[CH_A] =
540                                 (offset += dc->config_table.dl_app1_len);
541         dc->port[PORT_APP2].dl_size[CH_A] =
542                                 dc->config_table.dl_app2_len - buff_offset;
543 
544         /* Ctrl dl configuration */
545         dc->port[PORT_CTRL].dl_addr[CH_A] =
546                                 (offset += dc->config_table.dl_app2_len);
547         dc->port[PORT_CTRL].dl_size[CH_A] =
548                                 dc->config_table.dl_ctrl_len - buff_offset;
549 
550         offset = dc->base_addr + dc->config_table.ul_start;
551 
552         /* Modem Port ul configuration */
553         dc->port[PORT_MDM].ul_addr[CH_A] = offset;
554         dc->port[PORT_MDM].ul_size[CH_A] =
555                                 dc->config_table.ul_mdm_len1 - buff_offset;
556         dc->port[PORT_MDM].ul_addr[CH_B] =
557                                 (offset += dc->config_table.ul_mdm_len1);
558         dc->port[PORT_MDM].ul_size[CH_B] =
559                                 dc->config_table.ul_mdm_len2 - buff_offset;
560 
561         /* Diag port ul configuration */
562         dc->port[PORT_DIAG].ul_addr[CH_A] =
563                                 (offset += dc->config_table.ul_mdm_len2);
564         dc->port[PORT_DIAG].ul_size[CH_A] =
565                                 dc->config_table.ul_diag_len - buff_offset;
566 
567         /* App1 port ul configuration */
568         dc->port[PORT_APP1].ul_addr[CH_A] =
569                                 (offset += dc->config_table.ul_diag_len);
570         dc->port[PORT_APP1].ul_size[CH_A] =
571                                 dc->config_table.ul_app1_len - buff_offset;
572 
573         /* App2 port ul configuration */
574         dc->port[PORT_APP2].ul_addr[CH_A] =
575                                 (offset += dc->config_table.ul_app1_len);
576         dc->port[PORT_APP2].ul_size[CH_A] =
577                                 dc->config_table.ul_app2_len - buff_offset;
578 
579         /* Ctrl ul configuration */
580         dc->port[PORT_CTRL].ul_addr[CH_A] =
581                                 (offset += dc->config_table.ul_app2_len);
582         dc->port[PORT_CTRL].ul_size[CH_A] =
583                                 dc->config_table.ul_ctrl_len - buff_offset;
584 }
585 
586 /* Dump config table under initalization phase */
587 #ifdef DEBUG
588 static void dump_table(const struct nozomi *dc)
589 {
590         DBG3("signature: 0x%08X", dc->config_table.signature);
591         DBG3("version: 0x%04X", dc->config_table.version);
592         DBG3("product_information: 0x%04X", \
593                                 dc->config_table.product_information);
594         DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
595         DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
596         DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
597         DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
598 
599         DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
600         DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
601            dc->config_table.dl_mdm_len1);
602         DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
603            dc->config_table.dl_mdm_len2);
604         DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
605            dc->config_table.dl_diag_len1);
606         DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
607            dc->config_table.dl_diag_len2);
608         DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
609            dc->config_table.dl_app1_len);
610         DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
611            dc->config_table.dl_app2_len);
612         DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
613            dc->config_table.dl_ctrl_len);
614         DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
615            dc->config_table.ul_start);
616         DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
617            dc->config_table.ul_mdm_len1);
618         DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
619            dc->config_table.ul_mdm_len2);
620         DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
621            dc->config_table.ul_diag_len);
622         DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
623            dc->config_table.ul_app1_len);
624         DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
625            dc->config_table.ul_app2_len);
626         DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
627            dc->config_table.ul_ctrl_len);
628 }
629 #else
630 static inline void dump_table(const struct nozomi *dc) { }
631 #endif
632 
633 /*
634  * Read configuration table from card under intalization phase
635  * Returns 1 if ok, else 0
636  */
637 static int nozomi_read_config_table(struct nozomi *dc)
638 {
639         read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
640                                                 sizeof(struct config_table));
641 
642         if (dc->config_table.signature != NOZOMI_CONFIG_MAGIC) {
643                 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
644                         dc->config_table.signature, NOZOMI_CONFIG_MAGIC);
645                 return 0;
646         }
647 
648         if ((dc->config_table.version == 0)
649             || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
650                 int i;
651                 DBG1("Second phase, configuring card");
652 
653                 nozomi_setup_memory(dc);
654 
655                 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
656                 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
657                 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
658                 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
659                    dc->port[PORT_MDM].toggle_ul,
660                    dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
661 
662                 dump_table(dc);
663 
664                 for (i = PORT_MDM; i < MAX_PORT; i++) {
665                         memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
666                         memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
667                 }
668 
669                 /* Enable control channel */
670                 dc->last_ier = dc->last_ier | CTRL_DL;
671                 writew(dc->last_ier, dc->reg_ier);
672 
673                 dc->state = NOZOMI_STATE_ALLOCATED;
674                 dev_info(&dc->pdev->dev, "Initialization OK!\n");
675                 return 1;
676         }
677 
678         if ((dc->config_table.version > 0)
679             && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
680                 u32 offset = 0;
681                 DBG1("First phase: pushing upload buffers, clearing download");
682 
683                 dev_info(&dc->pdev->dev, "Version of card: %d\n",
684                          dc->config_table.version);
685 
686                 /* Here we should disable all I/O over F32. */
687                 nozomi_setup_memory(dc);
688 
689                 /*
690                  * We should send ALL channel pair tokens back along
691                  * with reset token
692                  */
693 
694                 /* push upload modem buffers */
695                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
696                         (u32 *) &offset, 4);
697                 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
698                         (u32 *) &offset, 4);
699 
700                 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
701 
702                 DBG1("First phase done");
703         }
704 
705         return 1;
706 }
707 
708 /* Enable uplink interrupts  */
709 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
710 {
711         static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
712 
713         if (port < NOZOMI_MAX_PORTS) {
714                 dc->last_ier |= mask[port];
715                 writew(dc->last_ier, dc->reg_ier);
716         } else {
717                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
718         }
719 }
720 
721 /* Disable uplink interrupts  */
722 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
723 {
724         static const u16 mask[] =
725                 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
726 
727         if (port < NOZOMI_MAX_PORTS) {
728                 dc->last_ier &= mask[port];
729                 writew(dc->last_ier, dc->reg_ier);
730         } else {
731                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
732         }
733 }
734 
735 /* Enable downlink interrupts */
736 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
737 {
738         static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
739 
740         if (port < NOZOMI_MAX_PORTS) {
741                 dc->last_ier |= mask[port];
742                 writew(dc->last_ier, dc->reg_ier);
743         } else {
744                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
745         }
746 }
747 
748 /* Disable downlink interrupts */
749 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
750 {
751         static const u16 mask[] =
752                 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
753 
754         if (port < NOZOMI_MAX_PORTS) {
755                 dc->last_ier &= mask[port];
756                 writew(dc->last_ier, dc->reg_ier);
757         } else {
758                 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
759         }
760 }
761 
762 /*
763  * Return 1 - send buffer to card and ack.
764  * Return 0 - don't ack, don't send buffer to card.
765  */
766 static int send_data(enum port_type index, struct nozomi *dc)
767 {
768         u32 size = 0;
769         struct port *port = &dc->port[index];
770         const u8 toggle = port->toggle_ul;
771         void __iomem *addr = port->ul_addr[toggle];
772         const u32 ul_size = port->ul_size[toggle];
773 
774         /* Get data from tty and place in buf for now */
775         size = kfifo_out(&port->fifo_ul, dc->send_buf,
776                            ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
777 
778         if (size == 0) {
779                 DBG4("No more data to send, disable link:");
780                 return 0;
781         }
782 
783         /* DUMP(buf, size); */
784 
785         /* Write length + data */
786         write_mem32(addr, (u32 *) &size, 4);
787         write_mem32(addr + 4, (u32 *) dc->send_buf, size);
788 
789         tty_port_tty_wakeup(&port->port);
790 
791         return 1;
792 }
793 
794 /* If all data has been read, return 1, else 0 */
795 static int receive_data(enum port_type index, struct nozomi *dc)
796 {
797         u8 buf[RECEIVE_BUF_MAX] = { 0 };
798         int size;
799         u32 offset = 4;
800         struct port *port = &dc->port[index];
801         void __iomem *addr = port->dl_addr[port->toggle_dl];
802         struct tty_struct *tty = tty_port_tty_get(&port->port);
803         int i, ret;
804 
805         size = __le32_to_cpu(readl(addr));
806         /*  DBG1( "%d bytes port: %d", size, index); */
807 
808         if (tty && tty_throttled(tty)) {
809                 DBG1("No room in tty, don't read data, don't ack interrupt, "
810                         "disable interrupt");
811 
812                 /* disable interrupt in downlink... */
813                 disable_transmit_dl(index, dc);
814                 ret = 0;
815                 goto put;
816         }
817 
818         if (unlikely(size == 0)) {
819                 dev_err(&dc->pdev->dev, "size == 0?\n");
820                 ret = 1;
821                 goto put;
822         }
823 
824         while (size > 0) {
825                 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
826 
827                 if (size == 1) {
828                         tty_insert_flip_char(&port->port, buf[0], TTY_NORMAL);
829                         size = 0;
830                 } else if (size < RECEIVE_BUF_MAX) {
831                         size -= tty_insert_flip_string(&port->port,
832                                         (char *)buf, size);
833                 } else {
834                         i = tty_insert_flip_string(&port->port,
835                                         (char *)buf, RECEIVE_BUF_MAX);
836                         size -= i;
837                         offset += i;
838                 }
839         }
840 
841         set_bit(index, &dc->flip);
842         ret = 1;
843 put:
844         tty_kref_put(tty);
845         return ret;
846 }
847 
848 /* Debug for interrupts */
849 #ifdef DEBUG
850 static char *interrupt2str(u16 interrupt)
851 {
852         static char buf[TMP_BUF_MAX];
853         char *p = buf;
854 
855         interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
856         interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
857                                         "MDM_DL2 ") : NULL;
858 
859         interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
860                                         "MDM_UL1 ") : NULL;
861         interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
862                                         "MDM_UL2 ") : NULL;
863 
864         interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
865                                         "DIAG_DL1 ") : NULL;
866         interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
867                                         "DIAG_DL2 ") : NULL;
868 
869         interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
870                                         "DIAG_UL ") : NULL;
871 
872         interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
873                                         "APP1_DL ") : NULL;
874         interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
875                                         "APP2_DL ") : NULL;
876 
877         interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
878                                         "APP1_UL ") : NULL;
879         interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
880                                         "APP2_UL ") : NULL;
881 
882         interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
883                                         "CTRL_DL ") : NULL;
884         interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
885                                         "CTRL_UL ") : NULL;
886 
887         interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
888                                         "RESET ") : NULL;
889 
890         return buf;
891 }
892 #endif
893 
894 /*
895  * Receive flow control
896  * Return 1 - If ok, else 0
897  */
898 static int receive_flow_control(struct nozomi *dc)
899 {
900         enum port_type port = PORT_MDM;
901         struct ctrl_dl ctrl_dl;
902         struct ctrl_dl old_ctrl;
903         u16 enable_ier = 0;
904 
905         read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
906 
907         switch (ctrl_dl.port) {
908         case CTRL_CMD:
909                 DBG1("The Base Band sends this value as a response to a "
910                         "request for IMSI detach sent over the control "
911                         "channel uplink (see section 7.6.1).");
912                 break;
913         case CTRL_MDM:
914                 port = PORT_MDM;
915                 enable_ier = MDM_DL;
916                 break;
917         case CTRL_DIAG:
918                 port = PORT_DIAG;
919                 enable_ier = DIAG_DL;
920                 break;
921         case CTRL_APP1:
922                 port = PORT_APP1;
923                 enable_ier = APP1_DL;
924                 break;
925         case CTRL_APP2:
926                 port = PORT_APP2;
927                 enable_ier = APP2_DL;
928                 if (dc->state == NOZOMI_STATE_ALLOCATED) {
929                         /*
930                          * After card initialization the flow control
931                          * received for APP2 is always the last
932                          */
933                         dc->state = NOZOMI_STATE_READY;
934                         dev_info(&dc->pdev->dev, "Device READY!\n");
935                 }
936                 break;
937         default:
938                 dev_err(&dc->pdev->dev,
939                         "ERROR: flow control received for non-existing port\n");
940                 return 0;
941         }
942 
943         DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
944            *((u16 *)&ctrl_dl));
945 
946         old_ctrl = dc->port[port].ctrl_dl;
947         dc->port[port].ctrl_dl = ctrl_dl;
948 
949         if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
950                 DBG1("Disable interrupt (0x%04X) on port: %d",
951                         enable_ier, port);
952                 disable_transmit_ul(port, dc);
953 
954         } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
955 
956                 if (kfifo_len(&dc->port[port].fifo_ul)) {
957                         DBG1("Enable interrupt (0x%04X) on port: %d",
958                                 enable_ier, port);
959                         DBG1("Data in buffer [%d], enable transmit! ",
960                                 kfifo_len(&dc->port[port].fifo_ul));
961                         enable_transmit_ul(port, dc);
962                 } else {
963                         DBG1("No data in buffer...");
964                 }
965         }
966 
967         if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
968                 DBG1(" No change in mctrl");
969                 return 1;
970         }
971         /* Update statistics */
972         if (old_ctrl.CTS != ctrl_dl.CTS)
973                 dc->port[port].tty_icount.cts++;
974         if (old_ctrl.DSR != ctrl_dl.DSR)
975                 dc->port[port].tty_icount.dsr++;
976         if (old_ctrl.RI != ctrl_dl.RI)
977                 dc->port[port].tty_icount.rng++;
978         if (old_ctrl.DCD != ctrl_dl.DCD)
979                 dc->port[port].tty_icount.dcd++;
980 
981         wake_up_interruptible(&dc->port[port].tty_wait);
982 
983         DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
984            port,
985            dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
986            dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
987 
988         return 1;
989 }
990 
991 static enum ctrl_port_type port2ctrl(enum port_type port,
992                                         const struct nozomi *dc)
993 {
994         switch (port) {
995         case PORT_MDM:
996                 return CTRL_MDM;
997         case PORT_DIAG:
998                 return CTRL_DIAG;
999         case PORT_APP1:
1000                 return CTRL_APP1;
1001         case PORT_APP2:
1002                 return CTRL_APP2;
1003         default:
1004                 dev_err(&dc->pdev->dev,
1005                         "ERROR: send flow control " \
1006                         "received for non-existing port\n");
1007         }
1008         return CTRL_ERROR;
1009 }
1010 
1011 /*
1012  * Send flow control, can only update one channel at a time
1013  * Return 0 - If we have updated all flow control
1014  * Return 1 - If we need to update more flow control, ack current enable more
1015  */
1016 static int send_flow_control(struct nozomi *dc)
1017 {
1018         u32 i, more_flow_control_to_be_updated = 0;
1019         u16 *ctrl;
1020 
1021         for (i = PORT_MDM; i < MAX_PORT; i++) {
1022                 if (dc->port[i].update_flow_control) {
1023                         if (more_flow_control_to_be_updated) {
1024                                 /* We have more flow control to be updated */
1025                                 return 1;
1026                         }
1027                         dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1028                         ctrl = (u16 *)&dc->port[i].ctrl_ul;
1029                         write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1030                                 (u32 *) ctrl, 2);
1031                         dc->port[i].update_flow_control = 0;
1032                         more_flow_control_to_be_updated = 1;
1033                 }
1034         }
1035         return 0;
1036 }
1037 
1038 /*
1039  * Handle downlink data, ports that are handled are modem and diagnostics
1040  * Return 1 - ok
1041  * Return 0 - toggle fields are out of sync
1042  */
1043 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1044                         u16 read_iir, u16 mask1, u16 mask2)
1045 {
1046         if (*toggle == 0 && read_iir & mask1) {
1047                 if (receive_data(port, dc)) {
1048                         writew(mask1, dc->reg_fcr);
1049                         *toggle = !(*toggle);
1050                 }
1051 
1052                 if (read_iir & mask2) {
1053                         if (receive_data(port, dc)) {
1054                                 writew(mask2, dc->reg_fcr);
1055                                 *toggle = !(*toggle);
1056                         }
1057                 }
1058         } else if (*toggle == 1 && read_iir & mask2) {
1059                 if (receive_data(port, dc)) {
1060                         writew(mask2, dc->reg_fcr);
1061                         *toggle = !(*toggle);
1062                 }
1063 
1064                 if (read_iir & mask1) {
1065                         if (receive_data(port, dc)) {
1066                                 writew(mask1, dc->reg_fcr);
1067                                 *toggle = !(*toggle);
1068                         }
1069                 }
1070         } else {
1071                 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1072                         *toggle);
1073                 return 0;
1074         }
1075         return 1;
1076 }
1077 
1078 /*
1079  * Handle uplink data, this is currently for the modem port
1080  * Return 1 - ok
1081  * Return 0 - toggle field are out of sync
1082  */
1083 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1084 {
1085         u8 *toggle = &(dc->port[port].toggle_ul);
1086 
1087         if (*toggle == 0 && read_iir & MDM_UL1) {
1088                 dc->last_ier &= ~MDM_UL;
1089                 writew(dc->last_ier, dc->reg_ier);
1090                 if (send_data(port, dc)) {
1091                         writew(MDM_UL1, dc->reg_fcr);
1092                         dc->last_ier = dc->last_ier | MDM_UL;
1093                         writew(dc->last_ier, dc->reg_ier);
1094                         *toggle = !*toggle;
1095                 }
1096 
1097                 if (read_iir & MDM_UL2) {
1098                         dc->last_ier &= ~MDM_UL;
1099                         writew(dc->last_ier, dc->reg_ier);
1100                         if (send_data(port, dc)) {
1101                                 writew(MDM_UL2, dc->reg_fcr);
1102                                 dc->last_ier = dc->last_ier | MDM_UL;
1103                                 writew(dc->last_ier, dc->reg_ier);
1104                                 *toggle = !*toggle;
1105                         }
1106                 }
1107 
1108         } else if (*toggle == 1 && read_iir & MDM_UL2) {
1109                 dc->last_ier &= ~MDM_UL;
1110                 writew(dc->last_ier, dc->reg_ier);
1111                 if (send_data(port, dc)) {
1112                         writew(MDM_UL2, 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_UL1) {
1119                         dc->last_ier &= ~MDM_UL;
1120                         writew(dc->last_ier, dc->reg_ier);
1121                         if (send_data(port, dc)) {
1122                                 writew(MDM_UL1, 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         } else {
1129                 writew(read_iir & MDM_UL, dc->reg_fcr);
1130                 dev_err(&dc->pdev->dev, "port out of sync!\n");
1131                 return 0;
1132         }
1133         return 1;
1134 }
1135 
1136 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1137 {
1138         struct nozomi *dc = dev_id;
1139         unsigned int a;
1140         u16 read_iir;
1141 
1142         if (!dc)
1143                 return IRQ_NONE;
1144 
1145         spin_lock(&dc->spin_mutex);
1146         read_iir = readw(dc->reg_iir);
1147 
1148         /* Card removed */
1149         if (read_iir == (u16)-1)
1150                 goto none;
1151         /*
1152          * Just handle interrupt enabled in IER
1153          * (by masking with dc->last_ier)
1154          */
1155         read_iir &= dc->last_ier;
1156 
1157         if (read_iir == 0)
1158                 goto none;
1159 
1160 
1161         DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1162                 dc->last_ier);
1163 
1164         if (read_iir & RESET) {
1165                 if (unlikely(!nozomi_read_config_table(dc))) {
1166                         dc->last_ier = 0x0;
1167                         writew(dc->last_ier, dc->reg_ier);
1168                         dev_err(&dc->pdev->dev, "Could not read status from "
1169                                 "card, we should disable interface\n");
1170                 } else {
1171                         writew(RESET, dc->reg_fcr);
1172                 }
1173                 /* No more useful info if this was the reset interrupt. */
1174                 goto exit_handler;
1175         }
1176         if (read_iir & CTRL_UL) {
1177                 DBG1("CTRL_UL");
1178                 dc->last_ier &= ~CTRL_UL;
1179                 writew(dc->last_ier, dc->reg_ier);
1180                 if (send_flow_control(dc)) {
1181                         writew(CTRL_UL, dc->reg_fcr);
1182                         dc->last_ier = dc->last_ier | CTRL_UL;
1183                         writew(dc->last_ier, dc->reg_ier);
1184                 }
1185         }
1186         if (read_iir & CTRL_DL) {
1187                 receive_flow_control(dc);
1188                 writew(CTRL_DL, dc->reg_fcr);
1189         }
1190         if (read_iir & MDM_DL) {
1191                 if (!handle_data_dl(dc, PORT_MDM,
1192                                 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1193                                 MDM_DL1, MDM_DL2)) {
1194                         dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1195                         goto exit_handler;
1196                 }
1197         }
1198         if (read_iir & MDM_UL) {
1199                 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1200                         dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1201                         goto exit_handler;
1202                 }
1203         }
1204         if (read_iir & DIAG_DL) {
1205                 if (!handle_data_dl(dc, PORT_DIAG,
1206                                 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1207                                 DIAG_DL1, DIAG_DL2)) {
1208                         dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1209                         goto exit_handler;
1210                 }
1211         }
1212         if (read_iir & DIAG_UL) {
1213                 dc->last_ier &= ~DIAG_UL;
1214                 writew(dc->last_ier, dc->reg_ier);
1215                 if (send_data(PORT_DIAG, dc)) {
1216                         writew(DIAG_UL, dc->reg_fcr);
1217                         dc->last_ier = dc->last_ier | DIAG_UL;
1218                         writew(dc->last_ier, dc->reg_ier);
1219                 }
1220         }
1221         if (read_iir & APP1_DL) {
1222                 if (receive_data(PORT_APP1, dc))
1223                         writew(APP1_DL, dc->reg_fcr);
1224         }
1225         if (read_iir & APP1_UL) {
1226                 dc->last_ier &= ~APP1_UL;
1227                 writew(dc->last_ier, dc->reg_ier);
1228                 if (send_data(PORT_APP1, dc)) {
1229                         writew(APP1_UL, dc->reg_fcr);
1230                         dc->last_ier = dc->last_ier | APP1_UL;
1231                         writew(dc->last_ier, dc->reg_ier);
1232                 }
1233         }
1234         if (read_iir & APP2_DL) {
1235                 if (receive_data(PORT_APP2, dc))
1236                         writew(APP2_DL, dc->reg_fcr);
1237         }
1238         if (read_iir & APP2_UL) {
1239                 dc->last_ier &= ~APP2_UL;
1240                 writew(dc->last_ier, dc->reg_ier);
1241                 if (send_data(PORT_APP2, dc)) {
1242                         writew(APP2_UL, dc->reg_fcr);
1243                         dc->last_ier = dc->last_ier | APP2_UL;
1244                         writew(dc->last_ier, dc->reg_ier);
1245                 }
1246         }
1247 
1248 exit_handler:
1249         spin_unlock(&dc->spin_mutex);
1250 
1251         for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1252                 if (test_and_clear_bit(a, &dc->flip))
1253                         tty_flip_buffer_push(&dc->port[a].port);
1254 
1255         return IRQ_HANDLED;
1256 none:
1257         spin_unlock(&dc->spin_mutex);
1258         return IRQ_NONE;
1259 }
1260 
1261 static void nozomi_get_card_type(struct nozomi *dc)
1262 {
1263         int i;
1264         u32 size = 0;
1265 
1266         for (i = 0; i < 6; i++)
1267                 size += pci_resource_len(dc->pdev, i);
1268 
1269         /* Assume card type F32_8 if no match */
1270         dc->card_type = size == 2048 ? F32_2 : F32_8;
1271 
1272         dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1273 }
1274 
1275 static void nozomi_setup_private_data(struct nozomi *dc)
1276 {
1277         void __iomem *offset = dc->base_addr + dc->card_type / 2;
1278         unsigned int i;
1279 
1280         dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1281         dc->reg_iir = (void __iomem *)(offset + R_IIR);
1282         dc->reg_ier = (void __iomem *)(offset + R_IER);
1283         dc->last_ier = 0;
1284         dc->flip = 0;
1285 
1286         dc->port[PORT_MDM].token_dl = MDM_DL;
1287         dc->port[PORT_DIAG].token_dl = DIAG_DL;
1288         dc->port[PORT_APP1].token_dl = APP1_DL;
1289         dc->port[PORT_APP2].token_dl = APP2_DL;
1290 
1291         for (i = 0; i < MAX_PORT; i++)
1292                 init_waitqueue_head(&dc->port[i].tty_wait);
1293 }
1294 
1295 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1296                           char *buf)
1297 {
1298         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1299 
1300         return sprintf(buf, "%d\n", dc->card_type);
1301 }
1302 static DEVICE_ATTR_RO(card_type);
1303 
1304 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1305                           char *buf)
1306 {
1307         const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1308 
1309         return sprintf(buf, "%u\n", dc->open_ttys);
1310 }
1311 static DEVICE_ATTR_RO(open_ttys);
1312 
1313 static void make_sysfs_files(struct nozomi *dc)
1314 {
1315         if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1316                 dev_err(&dc->pdev->dev,
1317                         "Could not create sysfs file for card_type\n");
1318         if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1319                 dev_err(&dc->pdev->dev,
1320                         "Could not create sysfs file for open_ttys\n");
1321 }
1322 
1323 static void remove_sysfs_files(struct nozomi *dc)
1324 {
1325         device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1326         device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1327 }
1328 
1329 /* Allocate memory for one device */
1330 static int nozomi_card_init(struct pci_dev *pdev,
1331                                       const struct pci_device_id *ent)
1332 {
1333         resource_size_t start;
1334         int ret;
1335         struct nozomi *dc = NULL;
1336         int ndev_idx;
1337         int i;
1338 
1339         dev_dbg(&pdev->dev, "Init, new card found\n");
1340 
1341         for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1342                 if (!ndevs[ndev_idx])
1343                         break;
1344 
1345         if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1346                 dev_err(&pdev->dev, "no free tty range for this card left\n");
1347                 ret = -EIO;
1348                 goto err;
1349         }
1350 
1351         dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1352         if (unlikely(!dc)) {
1353                 dev_err(&pdev->dev, "Could not allocate memory\n");
1354                 ret = -ENOMEM;
1355                 goto err_free;
1356         }
1357 
1358         dc->pdev = pdev;
1359 
1360         ret = pci_enable_device(dc->pdev);
1361         if (ret) {
1362                 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1363                 goto err_free;
1364         }
1365 
1366         ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1367         if (ret) {
1368                 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1369                         (int) /* nozomi_private.io_addr */ 0);
1370                 goto err_disable_device;
1371         }
1372 
1373         start = pci_resource_start(dc->pdev, 0);
1374         if (start == 0) {
1375                 dev_err(&pdev->dev, "No I/O address for card detected\n");
1376                 ret = -ENODEV;
1377                 goto err_rel_regs;
1378         }
1379 
1380         /* Find out what card type it is */
1381         nozomi_get_card_type(dc);
1382 
1383         dc->base_addr = ioremap_nocache(start, dc->card_type);
1384         if (!dc->base_addr) {
1385                 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1386                 ret = -ENODEV;
1387                 goto err_rel_regs;
1388         }
1389 
1390         dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1391         if (!dc->send_buf) {
1392                 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1393                 ret = -ENOMEM;
1394                 goto err_free_sbuf;
1395         }
1396 
1397         for (i = PORT_MDM; i < MAX_PORT; i++) {
1398                 if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1399                                         GFP_KERNEL)) {
1400                         dev_err(&pdev->dev,
1401                                         "Could not allocate kfifo buffer\n");
1402                         ret = -ENOMEM;
1403                         goto err_free_kfifo;
1404                 }
1405         }
1406 
1407         spin_lock_init(&dc->spin_mutex);
1408 
1409         nozomi_setup_private_data(dc);
1410 
1411         /* Disable all interrupts */
1412         dc->last_ier = 0;
1413         writew(dc->last_ier, dc->reg_ier);
1414 
1415         ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1416                         NOZOMI_NAME, dc);
1417         if (unlikely(ret)) {
1418                 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1419                 goto err_free_kfifo;
1420         }
1421 
1422         DBG1("base_addr: %p", dc->base_addr);
1423 
1424         make_sysfs_files(dc);
1425 
1426         dc->index_start = ndev_idx * MAX_PORT;
1427         ndevs[ndev_idx] = dc;
1428 
1429         pci_set_drvdata(pdev, dc);
1430 
1431         /* Enable RESET interrupt */
1432         dc->last_ier = RESET;
1433         iowrite16(dc->last_ier, dc->reg_ier);
1434 
1435         dc->state = NOZOMI_STATE_ENABLED;
1436 
1437         for (i = 0; i < MAX_PORT; i++) {
1438                 struct device *tty_dev;
1439                 struct port *port = &dc->port[i];
1440                 port->dc = dc;
1441                 tty_port_init(&port->port);
1442                 port->port.ops = &noz_tty_port_ops;
1443                 tty_dev = tty_port_register_device(&port->port, ntty_driver,
1444                                 dc->index_start + i, &pdev->dev);
1445 
1446                 if (IS_ERR(tty_dev)) {
1447                         ret = PTR_ERR(tty_dev);
1448                         dev_err(&pdev->dev, "Could not allocate tty?\n");
1449                         tty_port_destroy(&port->port);
1450                         goto err_free_tty;
1451                 }
1452         }
1453 
1454         return 0;
1455 
1456 err_free_tty:
1457         for (i = 0; i < MAX_PORT; ++i) {
1458                 tty_unregister_device(ntty_driver, dc->index_start + i);
1459                 tty_port_destroy(&dc->port[i].port);
1460         }
1461 err_free_kfifo:
1462         for (i = 0; i < MAX_PORT; i++)
1463                 kfifo_free(&dc->port[i].fifo_ul);
1464 err_free_sbuf:
1465         kfree(dc->send_buf);
1466         iounmap(dc->base_addr);
1467 err_rel_regs:
1468         pci_release_regions(pdev);
1469 err_disable_device:
1470         pci_disable_device(pdev);
1471 err_free:
1472         kfree(dc);
1473 err:
1474         return ret;
1475 }
1476 
1477 static void tty_exit(struct nozomi *dc)
1478 {
1479         unsigned int i;
1480 
1481         DBG1(" ");
1482 
1483         for (i = 0; i < MAX_PORT; ++i)
1484                 tty_port_tty_hangup(&dc->port[i].port, false);
1485 
1486         /* Racy below - surely should wait for scheduled work to be done or
1487            complete off a hangup method ? */
1488         while (dc->open_ttys)
1489                 msleep(1);
1490         for (i = 0; i < MAX_PORT; ++i) {
1491                 tty_unregister_device(ntty_driver, dc->index_start + i);
1492                 tty_port_destroy(&dc->port[i].port);
1493         }
1494 }
1495 
1496 /* Deallocate memory for one device */
1497 static void nozomi_card_exit(struct pci_dev *pdev)
1498 {
1499         int i;
1500         struct ctrl_ul ctrl;
1501         struct nozomi *dc = pci_get_drvdata(pdev);
1502 
1503         /* Disable all interrupts */
1504         dc->last_ier = 0;
1505         writew(dc->last_ier, dc->reg_ier);
1506 
1507         tty_exit(dc);
1508 
1509         /* Send 0x0001, command card to resend the reset token.  */
1510         /* This is to get the reset when the module is reloaded. */
1511         ctrl.port = 0x00;
1512         ctrl.reserved = 0;
1513         ctrl.RTS = 0;
1514         ctrl.DTR = 1;
1515         DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1516 
1517         /* Setup dc->reg addresses to we can use defines here */
1518         write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1519         writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
1520 
1521         remove_sysfs_files(dc);
1522 
1523         free_irq(pdev->irq, dc);
1524 
1525         for (i = 0; i < MAX_PORT; i++)
1526                 kfifo_free(&dc->port[i].fifo_ul);
1527 
1528         kfree(dc->send_buf);
1529 
1530         iounmap(dc->base_addr);
1531 
1532         pci_release_regions(pdev);
1533 
1534         pci_disable_device(pdev);
1535 
1536         ndevs[dc->index_start / MAX_PORT] = NULL;
1537 
1538         kfree(dc);
1539 }
1540 
1541 static void set_rts(const struct tty_struct *tty, int rts)
1542 {
1543         struct port *port = get_port_by_tty(tty);
1544 
1545         port->ctrl_ul.RTS = rts;
1546         port->update_flow_control = 1;
1547         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1548 }
1549 
1550 static void set_dtr(const struct tty_struct *tty, int dtr)
1551 {
1552         struct port *port = get_port_by_tty(tty);
1553 
1554         DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1555 
1556         port->ctrl_ul.DTR = dtr;
1557         port->update_flow_control = 1;
1558         enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1559 }
1560 
1561 /*
1562  * ----------------------------------------------------------------------------
1563  * TTY code
1564  * ----------------------------------------------------------------------------
1565  */
1566 
1567 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1568 {
1569         struct port *port = get_port_by_tty(tty);
1570         struct nozomi *dc = get_dc_by_tty(tty);
1571         int ret;
1572         if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1573                 return -ENODEV;
1574         ret = tty_standard_install(driver, tty);
1575         if (ret == 0)
1576                 tty->driver_data = port;
1577         return ret;
1578 }
1579 
1580 static void ntty_cleanup(struct tty_struct *tty)
1581 {
1582         tty->driver_data = NULL;
1583 }
1584 
1585 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1586 {
1587         struct port *port = container_of(tport, struct port, port);
1588         struct nozomi *dc = port->dc;
1589         unsigned long flags;
1590 
1591         DBG1("open: %d", port->token_dl);
1592         spin_lock_irqsave(&dc->spin_mutex, flags);
1593         dc->last_ier = dc->last_ier | port->token_dl;
1594         writew(dc->last_ier, dc->reg_ier);
1595         dc->open_ttys++;
1596         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1597         printk("noz: activated %d: %p\n", tty->index, tport);
1598         return 0;
1599 }
1600 
1601 static int ntty_open(struct tty_struct *tty, struct file *filp)
1602 {
1603         struct port *port = tty->driver_data;
1604         return tty_port_open(&port->port, tty, filp);
1605 }
1606 
1607 static void ntty_shutdown(struct tty_port *tport)
1608 {
1609         struct port *port = container_of(tport, struct port, port);
1610         struct nozomi *dc = port->dc;
1611         unsigned long flags;
1612 
1613         DBG1("close: %d", port->token_dl);
1614         spin_lock_irqsave(&dc->spin_mutex, flags);
1615         dc->last_ier &= ~(port->token_dl);
1616         writew(dc->last_ier, dc->reg_ier);
1617         dc->open_ttys--;
1618         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1619         printk("noz: shutdown %p\n", tport);
1620 }
1621 
1622 static void ntty_close(struct tty_struct *tty, struct file *filp)
1623 {
1624         struct port *port = tty->driver_data;
1625         if (port)
1626                 tty_port_close(&port->port, tty, filp);
1627 }
1628 
1629 static void ntty_hangup(struct tty_struct *tty)
1630 {
1631         struct port *port = tty->driver_data;
1632         tty_port_hangup(&port->port);
1633 }
1634 
1635 /*
1636  * called when the userspace process writes to the tty (/dev/noz*).
1637  * Data is inserted into a fifo, which is then read and transferred to the modem.
1638  */
1639 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1640                       int count)
1641 {
1642         int rval = -EINVAL;
1643         struct nozomi *dc = get_dc_by_tty(tty);
1644         struct port *port = tty->driver_data;
1645         unsigned long flags;
1646 
1647         /* DBG1( "WRITEx: %d, index = %d", count, index); */
1648 
1649         if (!dc || !port)
1650                 return -ENODEV;
1651 
1652         rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1653 
1654         spin_lock_irqsave(&dc->spin_mutex, flags);
1655         /* CTS is only valid on the modem channel */
1656         if (port == &(dc->port[PORT_MDM])) {
1657                 if (port->ctrl_dl.CTS) {
1658                         DBG4("Enable interrupt");
1659                         enable_transmit_ul(tty->index % MAX_PORT, dc);
1660                 } else {
1661                         dev_err(&dc->pdev->dev,
1662                                 "CTS not active on modem port?\n");
1663                 }
1664         } else {
1665                 enable_transmit_ul(tty->index % MAX_PORT, dc);
1666         }
1667         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1668 
1669         return rval;
1670 }
1671 
1672 /*
1673  * Calculate how much is left in device
1674  * This method is called by the upper tty layer.
1675  *   #according to sources N_TTY.c it expects a value >= 0 and
1676  *    does not check for negative values.
1677  *
1678  * If the port is unplugged report lots of room and let the bits
1679  * dribble away so we don't block anything.
1680  */
1681 static int ntty_write_room(struct tty_struct *tty)
1682 {
1683         struct port *port = tty->driver_data;
1684         int room = 4096;
1685         const struct nozomi *dc = get_dc_by_tty(tty);
1686 
1687         if (dc)
1688                 room = kfifo_avail(&port->fifo_ul);
1689 
1690         return room;
1691 }
1692 
1693 /* Gets io control parameters */
1694 static int ntty_tiocmget(struct tty_struct *tty)
1695 {
1696         const struct port *port = tty->driver_data;
1697         const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1698         const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1699 
1700         /* Note: these could change under us but it is not clear this
1701            matters if so */
1702         return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1703                 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1704                 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1705                 (ctrl_dl->RI  ? TIOCM_RNG : 0) |
1706                 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1707                 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1708 }
1709 
1710 /* Sets io controls parameters */
1711 static int ntty_tiocmset(struct tty_struct *tty,
1712                                         unsigned int set, unsigned int clear)
1713 {
1714         struct nozomi *dc = get_dc_by_tty(tty);
1715         unsigned long flags;
1716 
1717         spin_lock_irqsave(&dc->spin_mutex, flags);
1718         if (set & TIOCM_RTS)
1719                 set_rts(tty, 1);
1720         else if (clear & TIOCM_RTS)
1721                 set_rts(tty, 0);
1722 
1723         if (set & TIOCM_DTR)
1724                 set_dtr(tty, 1);
1725         else if (clear & TIOCM_DTR)
1726                 set_dtr(tty, 0);
1727         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1728 
1729         return 0;
1730 }
1731 
1732 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1733                 struct async_icount *cprev)
1734 {
1735         const struct async_icount cnow = port->tty_icount;
1736         int ret;
1737 
1738         ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1739                 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1740                 ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1741                 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1742 
1743         *cprev = cnow;
1744 
1745         return ret;
1746 }
1747 
1748 static int ntty_tiocgicount(struct tty_struct *tty,
1749                                 struct serial_icounter_struct *icount)
1750 {
1751         struct port *port = tty->driver_data;
1752         const struct async_icount cnow = port->tty_icount;
1753 
1754         icount->cts = cnow.cts;
1755         icount->dsr = cnow.dsr;
1756         icount->rng = cnow.rng;
1757         icount->dcd = cnow.dcd;
1758         icount->rx = cnow.rx;
1759         icount->tx = cnow.tx;
1760         icount->frame = cnow.frame;
1761         icount->overrun = cnow.overrun;
1762         icount->parity = cnow.parity;
1763         icount->brk = cnow.brk;
1764         icount->buf_overrun = cnow.buf_overrun;
1765         return 0;
1766 }
1767 
1768 static int ntty_ioctl(struct tty_struct *tty,
1769                       unsigned int cmd, unsigned long arg)
1770 {
1771         struct port *port = tty->driver_data;
1772         int rval = -ENOIOCTLCMD;
1773 
1774         DBG1("******** IOCTL, cmd: %d", cmd);
1775 
1776         switch (cmd) {
1777         case TIOCMIWAIT: {
1778                 struct async_icount cprev = port->tty_icount;
1779 
1780                 rval = wait_event_interruptible(port->tty_wait,
1781                                 ntty_cflags_changed(port, arg, &cprev));
1782                 break;
1783         }
1784         default:
1785                 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1786                 break;
1787         }
1788 
1789         return rval;
1790 }
1791 
1792 /*
1793  * Called by the upper tty layer when tty buffers are ready
1794  * to receive data again after a call to throttle.
1795  */
1796 static void ntty_unthrottle(struct tty_struct *tty)
1797 {
1798         struct nozomi *dc = get_dc_by_tty(tty);
1799         unsigned long flags;
1800 
1801         DBG1("UNTHROTTLE");
1802         spin_lock_irqsave(&dc->spin_mutex, flags);
1803         enable_transmit_dl(tty->index % MAX_PORT, dc);
1804         set_rts(tty, 1);
1805 
1806         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1807 }
1808 
1809 /*
1810  * Called by the upper tty layer when the tty buffers are almost full.
1811  * The driver should stop send more data.
1812  */
1813 static void ntty_throttle(struct tty_struct *tty)
1814 {
1815         struct nozomi *dc = get_dc_by_tty(tty);
1816         unsigned long flags;
1817 
1818         DBG1("THROTTLE");
1819         spin_lock_irqsave(&dc->spin_mutex, flags);
1820         set_rts(tty, 0);
1821         spin_unlock_irqrestore(&dc->spin_mutex, flags);
1822 }
1823 
1824 /* Returns number of chars in buffer, called by tty layer */
1825 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1826 {
1827         struct port *port = tty->driver_data;
1828         struct nozomi *dc = get_dc_by_tty(tty);
1829         s32 rval = 0;
1830 
1831         if (unlikely(!dc || !port)) {
1832                 goto exit_in_buffer;
1833         }
1834 
1835         rval = kfifo_len(&port->fifo_ul);
1836 
1837 exit_in_buffer:
1838         return rval;
1839 }
1840 
1841 static const struct tty_port_operations noz_tty_port_ops = {
1842         .activate = ntty_activate,
1843         .shutdown = ntty_shutdown,
1844 };
1845 
1846 static const struct tty_operations tty_ops = {
1847         .ioctl = ntty_ioctl,
1848         .open = ntty_open,
1849         .close = ntty_close,
1850         .hangup = ntty_hangup,
1851         .write = ntty_write,
1852         .write_room = ntty_write_room,
1853         .unthrottle = ntty_unthrottle,
1854         .throttle = ntty_throttle,
1855         .chars_in_buffer = ntty_chars_in_buffer,
1856         .tiocmget = ntty_tiocmget,
1857         .tiocmset = ntty_tiocmset,
1858         .get_icount = ntty_tiocgicount,
1859         .install = ntty_install,
1860         .cleanup = ntty_cleanup,
1861 };
1862 
1863 /* Module initialization */
1864 static struct pci_driver nozomi_driver = {
1865         .name = NOZOMI_NAME,
1866         .id_table = nozomi_pci_tbl,
1867         .probe = nozomi_card_init,
1868         .remove = nozomi_card_exit,
1869 };
1870 
1871 static __init int nozomi_init(void)
1872 {
1873         int ret;
1874 
1875         printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1876 
1877         ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1878         if (!ntty_driver)
1879                 return -ENOMEM;
1880 
1881         ntty_driver->driver_name = NOZOMI_NAME_TTY;
1882         ntty_driver->name = "noz";
1883         ntty_driver->major = 0;
1884         ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1885         ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1886         ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1887         ntty_driver->init_termios = tty_std_termios;
1888         ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1889                                                 HUPCL | CLOCAL;
1890         ntty_driver->init_termios.c_ispeed = 115200;
1891         ntty_driver->init_termios.c_ospeed = 115200;
1892         tty_set_operations(ntty_driver, &tty_ops);
1893 
1894         ret = tty_register_driver(ntty_driver);
1895         if (ret) {
1896                 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1897                 goto free_tty;
1898         }
1899 
1900         ret = pci_register_driver(&nozomi_driver);
1901         if (ret) {
1902                 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1903                 goto unr_tty;
1904         }
1905 
1906         return 0;
1907 unr_tty:
1908         tty_unregister_driver(ntty_driver);
1909 free_tty:
1910         put_tty_driver(ntty_driver);
1911         return ret;
1912 }
1913 
1914 static __exit void nozomi_exit(void)
1915 {
1916         printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1917         pci_unregister_driver(&nozomi_driver);
1918         tty_unregister_driver(ntty_driver);
1919         put_tty_driver(ntty_driver);
1920 }
1921 
1922 module_init(nozomi_init);
1923 module_exit(nozomi_exit);
1924 
1925 MODULE_LICENSE("Dual BSD/GPL");
1926 MODULE_DESCRIPTION(DRIVER_DESC);
1927 

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