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mac80211: fix race in TX aggregation
[linux-2.6/mini2440.git] / drivers / char / nozomi.c
blobd6102b644b550d0f9a306b015dd985f642d7e974
1 /*
2 * nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
3 *
4 * Written by: Ulf Jakobsson,
5 * Jan Åkerfeldt,
6 * Stefan Thomasson,
7 *
8 * Maintained by: Paul Hardwick (p.hardwick@option.com)
9 *
10 * Patches:
11 * Locking code changes for Vodafone by Sphere Systems Ltd,
12 * Andrew Bird (ajb@spheresystems.co.uk )
13 * & Phil Sanderson
14 *
15 * Source has been ported from an implementation made by Filip Aben @ Option
16 *
17 * --------------------------------------------------------------------------
18 *
19 * Copyright (c) 2005,2006 Option Wireless Sweden AB
20 * Copyright (c) 2006 Sphere Systems Ltd
21 * Copyright (c) 2006 Option Wireless n/v
22 * All rights Reserved.
23 *
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License, or
27 * (at your option) any later version.
28 *
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
33 *
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
37 *
38 * --------------------------------------------------------------------------
39 */
40
41 /* Enable this to have a lot of debug printouts */
42 #define DEBUG
43
44 #include <linux/kernel.h>
45 #include <linux/module.h>
46 #include <linux/pci.h>
47 #include <linux/ioport.h>
48 #include <linux/tty.h>
49 #include <linux/tty_driver.h>
50 #include <linux/tty_flip.h>
51 #include <linux/serial.h>
52 #include <linux/interrupt.h>
53 #include <linux/kmod.h>
54 #include <linux/init.h>
55 #include <linux/kfifo.h>
56 #include <linux/uaccess.h>
57 #include <asm/byteorder.h>
58
59 #include <linux/delay.h>
60
61
62 #define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
63 __DATE__ " " __TIME__ ")"
64
65 /* Macros definitions */
66
67 /* Default debug printout level */
68 #define NOZOMI_DEBUG_LEVEL 0x00
69
70 #define P_BUF_SIZE 128
71 #define NFO(_err_flag_, args...) \
72 do { \
73 char tmp[P_BUF_SIZE]; \
74 snprintf(tmp, sizeof(tmp), ##args); \
75 printk(_err_flag_ "[%d] %s(): %s\n", __LINE__, \
76 __func__, tmp); \
77 } while (0)
78
79 #define DBG1(args...) D_(0x01, ##args)
80 #define DBG2(args...) D_(0x02, ##args)
81 #define DBG3(args...) D_(0x04, ##args)
82 #define DBG4(args...) D_(0x08, ##args)
83 #define DBG5(args...) D_(0x10, ##args)
84 #define DBG6(args...) D_(0x20, ##args)
85 #define DBG7(args...) D_(0x40, ##args)
86 #define DBG8(args...) D_(0x80, ##args)
87
88 #ifdef DEBUG
89 /* Do we need this settable at runtime? */
90 static int debug = NOZOMI_DEBUG_LEVEL;
91
92 #define D(lvl, args...) do \
93 {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
94 while (0)
95 #define D_(lvl, args...) D(lvl, ##args)
96
97 /* These printouts are always printed */
98
99 #else
100 static int debug;
101 #define D_(lvl, args...)
102 #endif
103
104 /* TODO: rewrite to optimize macros... */
105
106 #define TMP_BUF_MAX 256
107
108 #define DUMP(buf__,len__) \
109 do { \
110 char tbuf[TMP_BUF_MAX] = {0};\
111 if (len__ > 1) {\
112 snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
113 if (tbuf[len__-2] == '\r') {\
114 tbuf[len__-2] = 'r';\
115 } \
116 DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
117 } else {\
118 DBG1("SENDING: '%s' (%d)", tbuf, len__);\
119 } \
120 } while (0)
121
122 /* Defines */
123 #define NOZOMI_NAME "nozomi"
124 #define NOZOMI_NAME_TTY "nozomi_tty"
125 #define DRIVER_DESC "Nozomi driver"
126
127 #define NTTY_TTY_MAXMINORS 256
128 #define NTTY_FIFO_BUFFER_SIZE 8192
129
130 /* Must be power of 2 */
131 #define FIFO_BUFFER_SIZE_UL 8192
132
133 /* Size of tmp send buffer to card */
134 #define SEND_BUF_MAX 1024
135 #define RECEIVE_BUF_MAX 4
136
137
138 /* Define all types of vendors and devices to support */
139 #define VENDOR1 0x1931 /* Vendor Option */
140 #define DEVICE1 0x000c /* HSDPA card */
141
142 #define R_IIR 0x0000 /* Interrupt Identity Register */
143 #define R_FCR 0x0000 /* Flow Control Register */
144 #define R_IER 0x0004 /* Interrupt Enable Register */
145
146 #define CONFIG_MAGIC 0xEFEFFEFE
147 #define TOGGLE_VALID 0x0000
148
149 /* Definition of interrupt tokens */
150 #define MDM_DL1 0x0001
151 #define MDM_UL1 0x0002
152 #define MDM_DL2 0x0004
153 #define MDM_UL2 0x0008
154 #define DIAG_DL1 0x0010
155 #define DIAG_DL2 0x0020
156 #define DIAG_UL 0x0040
157 #define APP1_DL 0x0080
158 #define APP1_UL 0x0100
159 #define APP2_DL 0x0200
160 #define APP2_UL 0x0400
161 #define CTRL_DL 0x0800
162 #define CTRL_UL 0x1000
163 #define RESET 0x8000
164
165 #define MDM_DL (MDM_DL1 | MDM_DL2)
166 #define MDM_UL (MDM_UL1 | MDM_UL2)
167 #define DIAG_DL (DIAG_DL1 | DIAG_DL2)
168
169 /* modem signal definition */
170 #define CTRL_DSR 0x0001
171 #define CTRL_DCD 0x0002
172 #define CTRL_RI 0x0004
173 #define CTRL_CTS 0x0008
174
175 #define CTRL_DTR 0x0001
176 #define CTRL_RTS 0x0002
177
178 #define MAX_PORT 4
179 #define NOZOMI_MAX_PORTS 5
180 #define NOZOMI_MAX_CARDS (NTTY_TTY_MAXMINORS / MAX_PORT)
181
182 /* Type definitions */
183
184 /*
185 * There are two types of nozomi cards,
186 * one with 2048 memory and with 8192 memory
187 */
188 enum card_type {
189 F32_2 = 2048, /* 512 bytes downlink + uplink * 2 -> 2048 */
190 F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
191 };
192
193 /* Initialization states a card can be in */
194 enum card_state {
195 NOZOMI_STATE_UKNOWN = 0,
196 NOZOMI_STATE_ENABLED = 1, /* pci device enabled */
197 NOZOMI_STATE_ALLOCATED = 2, /* config setup done */
198 NOZOMI_STATE_READY = 3, /* flowcontrols received */
199 };
200
201 /* Two different toggle channels exist */
202 enum channel_type {
203 CH_A = 0,
204 CH_B = 1,
205 };
206
207 /* Port definition for the card regarding flow control */
208 enum ctrl_port_type {
209 CTRL_CMD = 0,
210 CTRL_MDM = 1,
211 CTRL_DIAG = 2,
212 CTRL_APP1 = 3,
213 CTRL_APP2 = 4,
214 CTRL_ERROR = -1,
215 };
216
217 /* Ports that the nozomi has */
218 enum port_type {
219 PORT_MDM = 0,
220 PORT_DIAG = 1,
221 PORT_APP1 = 2,
222 PORT_APP2 = 3,
223 PORT_CTRL = 4,
224 PORT_ERROR = -1,
225 };
226
227 #ifdef __BIG_ENDIAN
228 /* Big endian */
229
230 struct toggles {
231 unsigned int enabled:5; /*
232 * Toggle fields are valid if enabled is 0,
233 * else A-channels must always be used.
234 */
235 unsigned int diag_dl:1;
236 unsigned int mdm_dl:1;
237 unsigned int mdm_ul:1;
238 } __attribute__ ((packed));
239
240 /* Configuration table to read at startup of card */
241 /* Is for now only needed during initialization phase */
242 struct config_table {
243 u32 signature;
244 u16 product_information;
245 u16 version;
246 u8 pad3[3];
247 struct toggles toggle;
248 u8 pad1[4];
249 u16 dl_mdm_len1; /*
250 * If this is 64, it can hold
251 * 60 bytes + 4 that is length field
252 */
253 u16 dl_start;
254
255 u16 dl_diag_len1;
256 u16 dl_mdm_len2; /*
257 * If this is 64, it can hold
258 * 60 bytes + 4 that is length field
259 */
260 u16 dl_app1_len;
261
262 u16 dl_diag_len2;
263 u16 dl_ctrl_len;
264 u16 dl_app2_len;
265 u8 pad2[16];
266 u16 ul_mdm_len1;
267 u16 ul_start;
268 u16 ul_diag_len;
269 u16 ul_mdm_len2;
270 u16 ul_app1_len;
271 u16 ul_app2_len;
272 u16 ul_ctrl_len;
273 } __attribute__ ((packed));
274
275 /* This stores all control downlink flags */
276 struct ctrl_dl {
277 u8 port;
278 unsigned int reserved:4;
279 unsigned int CTS:1;
280 unsigned int RI:1;
281 unsigned int DCD:1;
282 unsigned int DSR:1;
283 } __attribute__ ((packed));
284
285 /* This stores all control uplink flags */
286 struct ctrl_ul {
287 u8 port;
288 unsigned int reserved:6;
289 unsigned int RTS:1;
290 unsigned int DTR:1;
291 } __attribute__ ((packed));
292
293 #else
294 /* Little endian */
295
296 /* This represents the toggle information */
297 struct toggles {
298 unsigned int mdm_ul:1;
299 unsigned int mdm_dl:1;
300 unsigned int diag_dl:1;
301 unsigned int enabled:5; /*
302 * Toggle fields are valid if enabled is 0,
303 * else A-channels must always be used.
304 */
305 } __attribute__ ((packed));
306
307 /* Configuration table to read at startup of card */
308 struct config_table {
309 u32 signature;
310 u16 version;
311 u16 product_information;
312 struct toggles toggle;
313 u8 pad1[7];
314 u16 dl_start;
315 u16 dl_mdm_len1; /*
316 * If this is 64, it can hold
317 * 60 bytes + 4 that is length field
318 */
319 u16 dl_mdm_len2;
320 u16 dl_diag_len1;
321 u16 dl_diag_len2;
322 u16 dl_app1_len;
323 u16 dl_app2_len;
324 u16 dl_ctrl_len;
325 u8 pad2[16];
326 u16 ul_start;
327 u16 ul_mdm_len2;
328 u16 ul_mdm_len1;
329 u16 ul_diag_len;
330 u16 ul_app1_len;
331 u16 ul_app2_len;
332 u16 ul_ctrl_len;
333 } __attribute__ ((packed));
334
335 /* This stores all control downlink flags */
336 struct ctrl_dl {
337 unsigned int DSR:1;
338 unsigned int DCD:1;
339 unsigned int RI:1;
340 unsigned int CTS:1;
341 unsigned int reserverd:4;
342 u8 port;
343 } __attribute__ ((packed));
344
345 /* This stores all control uplink flags */
346 struct ctrl_ul {
347 unsigned int DTR:1;
348 unsigned int RTS:1;
349 unsigned int reserved:6;
350 u8 port;
351 } __attribute__ ((packed));
352 #endif
353
354 /* This holds all information that is needed regarding a port */
355 struct port {
356 struct tty_port port;
357 u8 update_flow_control;
358 struct ctrl_ul ctrl_ul;
359 struct ctrl_dl ctrl_dl;
360 struct kfifo *fifo_ul;
361 void __iomem *dl_addr[2];
362 u32 dl_size[2];
363 u8 toggle_dl;
364 void __iomem *ul_addr[2];
365 u32 ul_size[2];
366 u8 toggle_ul;
367 u16 token_dl;
368
369 /* mutex to ensure one access patch to this port */
370 struct mutex tty_sem;
371 wait_queue_head_t tty_wait;
372 struct async_icount tty_icount;
373 };
374
375 /* Private data one for each card in the system */
376 struct nozomi {
377 void __iomem *base_addr;
378 unsigned long flip;
379
380 /* Pointers to registers */
381 void __iomem *reg_iir;
382 void __iomem *reg_fcr;
383 void __iomem *reg_ier;
384
385 u16 last_ier;
386 enum card_type card_type;
387 struct config_table config_table; /* Configuration table */
388 struct pci_dev *pdev;
389 struct port port[NOZOMI_MAX_PORTS];
390 u8 *send_buf;
391
392 spinlock_t spin_mutex; /* secures access to registers and tty */
393
394 unsigned int index_start;
395 enum card_state state;
396 u32 open_ttys;
397 };
398
399 /* This is a data packet that is read or written to/from card */
400 struct buffer {
401 u32 size; /* size is the length of the data buffer */
402 u8 *data;
403 } __attribute__ ((packed));
404
405 /* Global variables */
406 static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
407 {PCI_DEVICE(VENDOR1, DEVICE1)},
408 {},
409 };
410
411 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
412
413 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
414 static struct tty_driver *ntty_driver;
415
416 /*
417 * find card by tty_index
418 */
419 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
420 {
421 return tty ? ndevs[tty->index / MAX_PORT] : NULL;
422 }
423
424 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
425 {
426 struct nozomi *ndev = get_dc_by_tty(tty);
427 return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
428 }
429
430 /*
431 * TODO:
432 * -Optimize
433 * -Rewrite cleaner
434 */
435
436 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
437 u32 size_bytes)
438 {
439 u32 i = 0;
440 const u32 __iomem *ptr = mem_addr_start;
441 u16 *buf16;
442
443 if (unlikely(!ptr || !buf))
444 goto out;
445
446 /* shortcut for extremely often used cases */
447 switch (size_bytes) {
448 case 2: /* 2 bytes */
449 buf16 = (u16 *) buf;
450 *buf16 = __le16_to_cpu(readw(ptr));
451 goto out;
452 break;
453 case 4: /* 4 bytes */
454 *(buf) = __le32_to_cpu(readl(ptr));
455 goto out;
456 break;
457 }
458
459 while (i < size_bytes) {
460 if (size_bytes - i == 2) {
461 /* Handle 2 bytes in the end */
462 buf16 = (u16 *) buf;
463 *(buf16) = __le16_to_cpu(readw(ptr));
464 i += 2;
465 } else {
466 /* Read 4 bytes */
467 *(buf) = __le32_to_cpu(readl(ptr));
468 i += 4;
469 }
470 buf++;
471 ptr++;
472 }
473 out:
474 return;
475 }
476
477 /*
478 * TODO:
479 * -Optimize
480 * -Rewrite cleaner
481 */
482 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
483 u32 size_bytes)
484 {
485 u32 i = 0;
486 u32 __iomem *ptr = mem_addr_start;
487 const u16 *buf16;
488
489 if (unlikely(!ptr || !buf))
490 return 0;
491
492 /* shortcut for extremely often used cases */
493 switch (size_bytes) {
494 case 2: /* 2 bytes */
495 buf16 = (const u16 *)buf;
496 writew(__cpu_to_le16(*buf16), ptr);
497 return 2;
498 break;
499 case 1: /*
500 * also needs to write 4 bytes in this case
501 * so falling through..
502 */
503 case 4: /* 4 bytes */
504 writel(__cpu_to_le32(*buf), ptr);
505 return 4;
506 break;
507 }
508
509 while (i < size_bytes) {
510 if (size_bytes - i == 2) {
511 /* 2 bytes */
512 buf16 = (const u16 *)buf;
513 writew(__cpu_to_le16(*buf16), ptr);
514 i += 2;
515 } else {
516 /* 4 bytes */
517 writel(__cpu_to_le32(*buf), ptr);
518 i += 4;
519 }
520 buf++;
521 ptr++;
522 }
523 return i;
524 }
525
526 /* Setup pointers to different channels and also setup buffer sizes. */
527 static void setup_memory(struct nozomi *dc)
528 {
529 void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
530 /* The length reported is including the length field of 4 bytes,
531 * hence subtract with 4.
532 */
533 const u16 buff_offset = 4;
534
535 /* Modem port dl configuration */
536 dc->port[PORT_MDM].dl_addr[CH_A] = offset;
537 dc->port[PORT_MDM].dl_addr[CH_B] =
538 (offset += dc->config_table.dl_mdm_len1);
539 dc->port[PORT_MDM].dl_size[CH_A] =
540 dc->config_table.dl_mdm_len1 - buff_offset;
541 dc->port[PORT_MDM].dl_size[CH_B] =
542 dc->config_table.dl_mdm_len2 - buff_offset;
543
544 /* Diag port dl configuration */
545 dc->port[PORT_DIAG].dl_addr[CH_A] =
546 (offset += dc->config_table.dl_mdm_len2);
547 dc->port[PORT_DIAG].dl_size[CH_A] =
548 dc->config_table.dl_diag_len1 - buff_offset;
549 dc->port[PORT_DIAG].dl_addr[CH_B] =
550 (offset += dc->config_table.dl_diag_len1);
551 dc->port[PORT_DIAG].dl_size[CH_B] =
552 dc->config_table.dl_diag_len2 - buff_offset;
553
554 /* App1 port dl configuration */
555 dc->port[PORT_APP1].dl_addr[CH_A] =
556 (offset += dc->config_table.dl_diag_len2);
557 dc->port[PORT_APP1].dl_size[CH_A] =
558 dc->config_table.dl_app1_len - buff_offset;
559
560 /* App2 port dl configuration */
561 dc->port[PORT_APP2].dl_addr[CH_A] =
562 (offset += dc->config_table.dl_app1_len);
563 dc->port[PORT_APP2].dl_size[CH_A] =
564 dc->config_table.dl_app2_len - buff_offset;
565
566 /* Ctrl dl configuration */
567 dc->port[PORT_CTRL].dl_addr[CH_A] =
568 (offset += dc->config_table.dl_app2_len);
569 dc->port[PORT_CTRL].dl_size[CH_A] =
570 dc->config_table.dl_ctrl_len - buff_offset;
571
572 offset = dc->base_addr + dc->config_table.ul_start;
573
574 /* Modem Port ul configuration */
575 dc->port[PORT_MDM].ul_addr[CH_A] = offset;
576 dc->port[PORT_MDM].ul_size[CH_A] =
577 dc->config_table.ul_mdm_len1 - buff_offset;
578 dc->port[PORT_MDM].ul_addr[CH_B] =
579 (offset += dc->config_table.ul_mdm_len1);
580 dc->port[PORT_MDM].ul_size[CH_B] =
581 dc->config_table.ul_mdm_len2 - buff_offset;
582
583 /* Diag port ul configuration */
584 dc->port[PORT_DIAG].ul_addr[CH_A] =
585 (offset += dc->config_table.ul_mdm_len2);
586 dc->port[PORT_DIAG].ul_size[CH_A] =
587 dc->config_table.ul_diag_len - buff_offset;
588
589 /* App1 port ul configuration */
590 dc->port[PORT_APP1].ul_addr[CH_A] =
591 (offset += dc->config_table.ul_diag_len);
592 dc->port[PORT_APP1].ul_size[CH_A] =
593 dc->config_table.ul_app1_len - buff_offset;
594
595 /* App2 port ul configuration */
596 dc->port[PORT_APP2].ul_addr[CH_A] =
597 (offset += dc->config_table.ul_app1_len);
598 dc->port[PORT_APP2].ul_size[CH_A] =
599 dc->config_table.ul_app2_len - buff_offset;
600
601 /* Ctrl ul configuration */
602 dc->port[PORT_CTRL].ul_addr[CH_A] =
603 (offset += dc->config_table.ul_app2_len);
604 dc->port[PORT_CTRL].ul_size[CH_A] =
605 dc->config_table.ul_ctrl_len - buff_offset;
606 }
607
608 /* Dump config table under initalization phase */
609 #ifdef DEBUG
610 static void dump_table(const struct nozomi *dc)
611 {
612 DBG3("signature: 0x%08X", dc->config_table.signature);
613 DBG3("version: 0x%04X", dc->config_table.version);
614 DBG3("product_information: 0x%04X", \
615 dc->config_table.product_information);
616 DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
617 DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
618 DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
619 DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
620
621 DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
622 DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
623 dc->config_table.dl_mdm_len1);
624 DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
625 dc->config_table.dl_mdm_len2);
626 DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
627 dc->config_table.dl_diag_len1);
628 DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
629 dc->config_table.dl_diag_len2);
630 DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
631 dc->config_table.dl_app1_len);
632 DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
633 dc->config_table.dl_app2_len);
634 DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
635 dc->config_table.dl_ctrl_len);
636 DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
637 dc->config_table.ul_start);
638 DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
639 dc->config_table.ul_mdm_len1);
640 DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
641 dc->config_table.ul_mdm_len2);
642 DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
643 dc->config_table.ul_diag_len);
644 DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
645 dc->config_table.ul_app1_len);
646 DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
647 dc->config_table.ul_app2_len);
648 DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
649 dc->config_table.ul_ctrl_len);
650 }
651 #else
652 static inline void dump_table(const struct nozomi *dc) { }
653 #endif
654
655 /*
656 * Read configuration table from card under intalization phase
657 * Returns 1 if ok, else 0
658 */
659 static int nozomi_read_config_table(struct nozomi *dc)
660 {
661 read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
662 sizeof(struct config_table));
663
664 if (dc->config_table.signature != CONFIG_MAGIC) {
665 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
666 dc->config_table.signature, CONFIG_MAGIC);
667 return 0;
668 }
669
670 if ((dc->config_table.version == 0)
671 || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
672 int i;
673 DBG1("Second phase, configuring card");
674
675 setup_memory(dc);
676
677 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
678 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
679 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
680 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
681 dc->port[PORT_MDM].toggle_ul,
682 dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
683
684 dump_table(dc);
685
686 for (i = PORT_MDM; i < MAX_PORT; i++) {
687 dc->port[i].fifo_ul =
688 kfifo_alloc(FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
689 memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
690 memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
691 }
692
693 /* Enable control channel */
694 dc->last_ier = dc->last_ier | CTRL_DL;
695 writew(dc->last_ier, dc->reg_ier);
696
697 dc->state = NOZOMI_STATE_ALLOCATED;
698 dev_info(&dc->pdev->dev, "Initialization OK!\n");
699 return 1;
700 }
701
702 if ((dc->config_table.version > 0)
703 && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
704 u32 offset = 0;
705 DBG1("First phase: pushing upload buffers, clearing download");
706
707 dev_info(&dc->pdev->dev, "Version of card: %d\n",
708 dc->config_table.version);
709
710 /* Here we should disable all I/O over F32. */
711 setup_memory(dc);
712
713 /*
714 * We should send ALL channel pair tokens back along
715 * with reset token
716 */
717
718 /* push upload modem buffers */
719 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
720 (u32 *) &offset, 4);
721 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
722 (u32 *) &offset, 4);
723
724 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
725
726 DBG1("First phase done");
727 }
728
729 return 1;
730 }
731
732 /* Enable uplink interrupts */
733 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
734 {
735 static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
736
737 if (port < NOZOMI_MAX_PORTS) {
738 dc->last_ier |= mask[port];
739 writew(dc->last_ier, dc->reg_ier);
740 } else {
741 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
742 }
743 }
744
745 /* Disable uplink interrupts */
746 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
747 {
748 static const u16 mask[] =
749 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
750
751 if (port < NOZOMI_MAX_PORTS) {
752 dc->last_ier &= mask[port];
753 writew(dc->last_ier, dc->reg_ier);
754 } else {
755 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
756 }
757 }
758
759 /* Enable downlink interrupts */
760 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
761 {
762 static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
763
764 if (port < NOZOMI_MAX_PORTS) {
765 dc->last_ier |= mask[port];
766 writew(dc->last_ier, dc->reg_ier);
767 } else {
768 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
769 }
770 }
771
772 /* Disable downlink interrupts */
773 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
774 {
775 static const u16 mask[] =
776 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
777
778 if (port < NOZOMI_MAX_PORTS) {
779 dc->last_ier &= mask[port];
780 writew(dc->last_ier, dc->reg_ier);
781 } else {
782 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
783 }
784 }
785
786 /*
787 * Return 1 - send buffer to card and ack.
788 * Return 0 - don't ack, don't send buffer to card.
789 */
790 static int send_data(enum port_type index, struct nozomi *dc)
791 {
792 u32 size = 0;
793 struct port *port = &dc->port[index];
794 const u8 toggle = port->toggle_ul;
795 void __iomem *addr = port->ul_addr[toggle];
796 const u32 ul_size = port->ul_size[toggle];
797 struct tty_struct *tty = tty_port_tty_get(&port->port);
798
799 /* Get data from tty and place in buf for now */
800 size = __kfifo_get(port->fifo_ul, dc->send_buf,
801 ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
802
803 if (size == 0) {
804 DBG4("No more data to send, disable link:");
805 tty_kref_put(tty);
806 return 0;
807 }
808
809 /* DUMP(buf, size); */
810
811 /* Write length + data */
812 write_mem32(addr, (u32 *) &size, 4);
813 write_mem32(addr + 4, (u32 *) dc->send_buf, size);
814
815 if (tty)
816 tty_wakeup(tty);
817
818 tty_kref_put(tty);
819 return 1;
820 }
821
822 /* If all data has been read, return 1, else 0 */
823 static int receive_data(enum port_type index, struct nozomi *dc)
824 {
825 u8 buf[RECEIVE_BUF_MAX] = { 0 };
826 int size;
827 u32 offset = 4;
828 struct port *port = &dc->port[index];
829 void __iomem *addr = port->dl_addr[port->toggle_dl];
830 struct tty_struct *tty = tty_port_tty_get(&port->port);
831 int i;
832
833 if (unlikely(!tty)) {
834 DBG1("tty not open for port: %d?", index);
835 return 1;
836 }
837
838 read_mem32((u32 *) &size, addr, 4);
839 /* DBG1( "%d bytes port: %d", size, index); */
840
841 if (test_bit(TTY_THROTTLED, &tty->flags)) {
842 DBG1("No room in tty, don't read data, don't ack interrupt, "
843 "disable interrupt");
844
845 /* disable interrupt in downlink... */
846 disable_transmit_dl(index, dc);
847 return 0;
848 }
849
850 if (unlikely(size == 0)) {
851 dev_err(&dc->pdev->dev, "size == 0?\n");
852 return 1;
853 }
854
855 tty_buffer_request_room(tty, size);
856
857 while (size > 0) {
858 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
859
860 if (size == 1) {
861 tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
862 size = 0;
863 } else if (size < RECEIVE_BUF_MAX) {
864 size -= tty_insert_flip_string(tty, (char *) buf, size);
865 } else {
866 i = tty_insert_flip_string(tty, \
867 (char *) buf, RECEIVE_BUF_MAX);
868 size -= i;
869 offset += i;
870 }
871 }
872
873 set_bit(index, &dc->flip);
874 tty_kref_put(tty);
875 return 1;
876 }
877
878 /* Debug for interrupts */
879 #ifdef DEBUG
880 static char *interrupt2str(u16 interrupt)
881 {
882 static char buf[TMP_BUF_MAX];
883 char *p = buf;
884
885 interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
886 interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
887 "MDM_DL2 ") : NULL;
888
889 interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
890 "MDM_UL1 ") : NULL;
891 interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
892 "MDM_UL2 ") : NULL;
893
894 interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
895 "DIAG_DL1 ") : NULL;
896 interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
897 "DIAG_DL2 ") : NULL;
898
899 interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
900 "DIAG_UL ") : NULL;
901
902 interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
903 "APP1_DL ") : NULL;
904 interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
905 "APP2_DL ") : NULL;
906
907 interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
908 "APP1_UL ") : NULL;
909 interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
910 "APP2_UL ") : NULL;
911
912 interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
913 "CTRL_DL ") : NULL;
914 interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
915 "CTRL_UL ") : NULL;
916
917 interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
918 "RESET ") : NULL;
919
920 return buf;
921 }
922 #endif
923
924 /*
925 * Receive flow control
926 * Return 1 - If ok, else 0
927 */
928 static int receive_flow_control(struct nozomi *dc)
929 {
930 enum port_type port = PORT_MDM;
931 struct ctrl_dl ctrl_dl;
932 struct ctrl_dl old_ctrl;
933 u16 enable_ier = 0;
934
935 read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
936
937 switch (ctrl_dl.port) {
938 case CTRL_CMD:
939 DBG1("The Base Band sends this value as a response to a "
940 "request for IMSI detach sent over the control "
941 "channel uplink (see section 7.6.1).");
942 break;
943 case CTRL_MDM:
944 port = PORT_MDM;
945 enable_ier = MDM_DL;
946 break;
947 case CTRL_DIAG:
948 port = PORT_DIAG;
949 enable_ier = DIAG_DL;
950 break;
951 case CTRL_APP1:
952 port = PORT_APP1;
953 enable_ier = APP1_DL;
954 break;
955 case CTRL_APP2:
956 port = PORT_APP2;
957 enable_ier = APP2_DL;
958 if (dc->state == NOZOMI_STATE_ALLOCATED) {
959 /*
960 * After card initialization the flow control
961 * received for APP2 is always the last
962 */
963 dc->state = NOZOMI_STATE_READY;
964 dev_info(&dc->pdev->dev, "Device READY!\n");
965 }
966 break;
967 default:
968 dev_err(&dc->pdev->dev,
969 "ERROR: flow control received for non-existing port\n");
970 return 0;
971 };
972
973 DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
974 *((u16 *)&ctrl_dl));
975
976 old_ctrl = dc->port[port].ctrl_dl;
977 dc->port[port].ctrl_dl = ctrl_dl;
978
979 if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
980 DBG1("Disable interrupt (0x%04X) on port: %d",
981 enable_ier, port);
982 disable_transmit_ul(port, dc);
983
984 } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
985
986 if (__kfifo_len(dc->port[port].fifo_ul)) {
987 DBG1("Enable interrupt (0x%04X) on port: %d",
988 enable_ier, port);
989 DBG1("Data in buffer [%d], enable transmit! ",
990 __kfifo_len(dc->port[port].fifo_ul));
991 enable_transmit_ul(port, dc);
992 } else {
993 DBG1("No data in buffer...");
994 }
995 }
996
997 if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
998 DBG1(" No change in mctrl");
999 return 1;
1000 }
1001 /* Update statistics */
1002 if (old_ctrl.CTS != ctrl_dl.CTS)
1003 dc->port[port].tty_icount.cts++;
1004 if (old_ctrl.DSR != ctrl_dl.DSR)
1005 dc->port[port].tty_icount.dsr++;
1006 if (old_ctrl.RI != ctrl_dl.RI)
1007 dc->port[port].tty_icount.rng++;
1008 if (old_ctrl.DCD != ctrl_dl.DCD)
1009 dc->port[port].tty_icount.dcd++;
1010
1011 wake_up_interruptible(&dc->port[port].tty_wait);
1012
1013 DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1014 port,
1015 dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1016 dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1017
1018 return 1;
1019 }
1020
1021 static enum ctrl_port_type port2ctrl(enum port_type port,
1022 const struct nozomi *dc)
1023 {
1024 switch (port) {
1025 case PORT_MDM:
1026 return CTRL_MDM;
1027 case PORT_DIAG:
1028 return CTRL_DIAG;
1029 case PORT_APP1:
1030 return CTRL_APP1;
1031 case PORT_APP2:
1032 return CTRL_APP2;
1033 default:
1034 dev_err(&dc->pdev->dev,
1035 "ERROR: send flow control " \
1036 "received for non-existing port\n");
1037 };
1038 return CTRL_ERROR;
1039 }
1040
1041 /*
1042 * Send flow control, can only update one channel at a time
1043 * Return 0 - If we have updated all flow control
1044 * Return 1 - If we need to update more flow control, ack current enable more
1045 */
1046 static int send_flow_control(struct nozomi *dc)
1047 {
1048 u32 i, more_flow_control_to_be_updated = 0;
1049 u16 *ctrl;
1050
1051 for (i = PORT_MDM; i < MAX_PORT; i++) {
1052 if (dc->port[i].update_flow_control) {
1053 if (more_flow_control_to_be_updated) {
1054 /* We have more flow control to be updated */
1055 return 1;
1056 }
1057 dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1058 ctrl = (u16 *)&dc->port[i].ctrl_ul;
1059 write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1060 (u32 *) ctrl, 2);
1061 dc->port[i].update_flow_control = 0;
1062 more_flow_control_to_be_updated = 1;
1063 }
1064 }
1065 return 0;
1066 }
1067
1068 /*
1069 * Handle downlink data, ports that are handled are modem and diagnostics
1070 * Return 1 - ok
1071 * Return 0 - toggle fields are out of sync
1072 */
1073 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1074 u16 read_iir, u16 mask1, u16 mask2)
1075 {
1076 if (*toggle == 0 && read_iir & mask1) {
1077 if (receive_data(port, dc)) {
1078 writew(mask1, dc->reg_fcr);
1079 *toggle = !(*toggle);
1080 }
1081
1082 if (read_iir & mask2) {
1083 if (receive_data(port, dc)) {
1084 writew(mask2, dc->reg_fcr);
1085 *toggle = !(*toggle);
1086 }
1087 }
1088 } else if (*toggle == 1 && read_iir & mask2) {
1089 if (receive_data(port, dc)) {
1090 writew(mask2, dc->reg_fcr);
1091 *toggle = !(*toggle);
1092 }
1093
1094 if (read_iir & mask1) {
1095 if (receive_data(port, dc)) {
1096 writew(mask1, dc->reg_fcr);
1097 *toggle = !(*toggle);
1098 }
1099 }
1100 } else {
1101 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1102 *toggle);
1103 return 0;
1104 }
1105 return 1;
1106 }
1107
1108 /*
1109 * Handle uplink data, this is currently for the modem port
1110 * Return 1 - ok
1111 * Return 0 - toggle field are out of sync
1112 */
1113 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1114 {
1115 u8 *toggle = &(dc->port[port].toggle_ul);
1116
1117 if (*toggle == 0 && read_iir & MDM_UL1) {
1118 dc->last_ier &= ~MDM_UL;
1119 writew(dc->last_ier, dc->reg_ier);
1120 if (send_data(port, dc)) {
1121 writew(MDM_UL1, dc->reg_fcr);
1122 dc->last_ier = dc->last_ier | MDM_UL;
1123 writew(dc->last_ier, dc->reg_ier);
1124 *toggle = !*toggle;
1125 }
1126
1127 if (read_iir & MDM_UL2) {
1128 dc->last_ier &= ~MDM_UL;
1129 writew(dc->last_ier, dc->reg_ier);
1130 if (send_data(port, dc)) {
1131 writew(MDM_UL2, dc->reg_fcr);
1132 dc->last_ier = dc->last_ier | MDM_UL;
1133 writew(dc->last_ier, dc->reg_ier);
1134 *toggle = !*toggle;
1135 }
1136 }
1137
1138 } else if (*toggle == 1 && read_iir & MDM_UL2) {
1139 dc->last_ier &= ~MDM_UL;
1140 writew(dc->last_ier, dc->reg_ier);
1141 if (send_data(port, dc)) {
1142 writew(MDM_UL2, dc->reg_fcr);
1143 dc->last_ier = dc->last_ier | MDM_UL;
1144 writew(dc->last_ier, dc->reg_ier);
1145 *toggle = !*toggle;
1146 }
1147
1148 if (read_iir & MDM_UL1) {
1149 dc->last_ier &= ~MDM_UL;
1150 writew(dc->last_ier, dc->reg_ier);
1151 if (send_data(port, dc)) {
1152 writew(MDM_UL1, dc->reg_fcr);
1153 dc->last_ier = dc->last_ier | MDM_UL;
1154 writew(dc->last_ier, dc->reg_ier);
1155 *toggle = !*toggle;
1156 }
1157 }
1158 } else {
1159 writew(read_iir & MDM_UL, dc->reg_fcr);
1160 dev_err(&dc->pdev->dev, "port out of sync!\n");
1161 return 0;
1162 }
1163 return 1;
1164 }
1165
1166 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1167 {
1168 struct nozomi *dc = dev_id;
1169 unsigned int a;
1170 u16 read_iir;
1171
1172 if (!dc)
1173 return IRQ_NONE;
1174
1175 spin_lock(&dc->spin_mutex);
1176 read_iir = readw(dc->reg_iir);
1177
1178 /* Card removed */
1179 if (read_iir == (u16)-1)
1180 goto none;
1181 /*
1182 * Just handle interrupt enabled in IER
1183 * (by masking with dc->last_ier)
1184 */
1185 read_iir &= dc->last_ier;
1186
1187 if (read_iir == 0)
1188 goto none;
1189
1190
1191 DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1192 dc->last_ier);
1193
1194 if (read_iir & RESET) {
1195 if (unlikely(!nozomi_read_config_table(dc))) {
1196 dc->last_ier = 0x0;
1197 writew(dc->last_ier, dc->reg_ier);
1198 dev_err(&dc->pdev->dev, "Could not read status from "
1199 "card, we should disable interface\n");
1200 } else {
1201 writew(RESET, dc->reg_fcr);
1202 }
1203 /* No more useful info if this was the reset interrupt. */
1204 goto exit_handler;
1205 }
1206 if (read_iir & CTRL_UL) {
1207 DBG1("CTRL_UL");
1208 dc->last_ier &= ~CTRL_UL;
1209 writew(dc->last_ier, dc->reg_ier);
1210 if (send_flow_control(dc)) {
1211 writew(CTRL_UL, dc->reg_fcr);
1212 dc->last_ier = dc->last_ier | CTRL_UL;
1213 writew(dc->last_ier, dc->reg_ier);
1214 }
1215 }
1216 if (read_iir & CTRL_DL) {
1217 receive_flow_control(dc);
1218 writew(CTRL_DL, dc->reg_fcr);
1219 }
1220 if (read_iir & MDM_DL) {
1221 if (!handle_data_dl(dc, PORT_MDM,
1222 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1223 MDM_DL1, MDM_DL2)) {
1224 dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1225 goto exit_handler;
1226 }
1227 }
1228 if (read_iir & MDM_UL) {
1229 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1230 dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1231 goto exit_handler;
1232 }
1233 }
1234 if (read_iir & DIAG_DL) {
1235 if (!handle_data_dl(dc, PORT_DIAG,
1236 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1237 DIAG_DL1, DIAG_DL2)) {
1238 dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1239 goto exit_handler;
1240 }
1241 }
1242 if (read_iir & DIAG_UL) {
1243 dc->last_ier &= ~DIAG_UL;
1244 writew(dc->last_ier, dc->reg_ier);
1245 if (send_data(PORT_DIAG, dc)) {
1246 writew(DIAG_UL, dc->reg_fcr);
1247 dc->last_ier = dc->last_ier | DIAG_UL;
1248 writew(dc->last_ier, dc->reg_ier);
1249 }
1250 }
1251 if (read_iir & APP1_DL) {
1252 if (receive_data(PORT_APP1, dc))
1253 writew(APP1_DL, dc->reg_fcr);
1254 }
1255 if (read_iir & APP1_UL) {
1256 dc->last_ier &= ~APP1_UL;
1257 writew(dc->last_ier, dc->reg_ier);
1258 if (send_data(PORT_APP1, dc)) {
1259 writew(APP1_UL, dc->reg_fcr);
1260 dc->last_ier = dc->last_ier | APP1_UL;
1261 writew(dc->last_ier, dc->reg_ier);
1262 }
1263 }
1264 if (read_iir & APP2_DL) {
1265 if (receive_data(PORT_APP2, dc))
1266 writew(APP2_DL, dc->reg_fcr);
1267 }
1268 if (read_iir & APP2_UL) {
1269 dc->last_ier &= ~APP2_UL;
1270 writew(dc->last_ier, dc->reg_ier);
1271 if (send_data(PORT_APP2, dc)) {
1272 writew(APP2_UL, dc->reg_fcr);
1273 dc->last_ier = dc->last_ier | APP2_UL;
1274 writew(dc->last_ier, dc->reg_ier);
1275 }
1276 }
1277
1278 exit_handler:
1279 spin_unlock(&dc->spin_mutex);
1280 for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
1281 struct tty_struct *tty;
1282 if (test_and_clear_bit(a, &dc->flip)) {
1283 tty = tty_port_tty_get(&dc->port[a].port);
1284 if (tty)
1285 tty_flip_buffer_push(tty);
1286 tty_kref_put(tty);
1287 }
1288 }
1289 return IRQ_HANDLED;
1290 none:
1291 spin_unlock(&dc->spin_mutex);
1292 return IRQ_NONE;
1293 }
1294
1295 static void nozomi_get_card_type(struct nozomi *dc)
1296 {
1297 int i;
1298 u32 size = 0;
1299
1300 for (i = 0; i < 6; i++)
1301 size += pci_resource_len(dc->pdev, i);
1302
1303 /* Assume card type F32_8 if no match */
1304 dc->card_type = size == 2048 ? F32_2 : F32_8;
1305
1306 dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1307 }
1308
1309 static void nozomi_setup_private_data(struct nozomi *dc)
1310 {
1311 void __iomem *offset = dc->base_addr + dc->card_type / 2;
1312 unsigned int i;
1313
1314 dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1315 dc->reg_iir = (void __iomem *)(offset + R_IIR);
1316 dc->reg_ier = (void __iomem *)(offset + R_IER);
1317 dc->last_ier = 0;
1318 dc->flip = 0;
1319
1320 dc->port[PORT_MDM].token_dl = MDM_DL;
1321 dc->port[PORT_DIAG].token_dl = DIAG_DL;
1322 dc->port[PORT_APP1].token_dl = APP1_DL;
1323 dc->port[PORT_APP2].token_dl = APP2_DL;
1324
1325 for (i = 0; i < MAX_PORT; i++)
1326 init_waitqueue_head(&dc->port[i].tty_wait);
1327 }
1328
1329 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1330 char *buf)
1331 {
1332 const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1333
1334 return sprintf(buf, "%d\n", dc->card_type);
1335 }
1336 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1337
1338 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1339 char *buf)
1340 {
1341 const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1342
1343 return sprintf(buf, "%u\n", dc->open_ttys);
1344 }
1345 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1346
1347 static void make_sysfs_files(struct nozomi *dc)
1348 {
1349 if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1350 dev_err(&dc->pdev->dev,
1351 "Could not create sysfs file for card_type\n");
1352 if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1353 dev_err(&dc->pdev->dev,
1354 "Could not create sysfs file for open_ttys\n");
1355 }
1356
1357 static void remove_sysfs_files(struct nozomi *dc)
1358 {
1359 device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1360 device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1361 }
1362
1363 /* Allocate memory for one device */
1364 static int __devinit nozomi_card_init(struct pci_dev *pdev,
1365 const struct pci_device_id *ent)
1366 {
1367 resource_size_t start;
1368 int ret;
1369 struct nozomi *dc = NULL;
1370 int ndev_idx;
1371 int i;
1372
1373 dev_dbg(&pdev->dev, "Init, new card found\n");
1374
1375 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1376 if (!ndevs[ndev_idx])
1377 break;
1378
1379 if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1380 dev_err(&pdev->dev, "no free tty range for this card left\n");
1381 ret = -EIO;
1382 goto err;
1383 }
1384
1385 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1386 if (unlikely(!dc)) {
1387 dev_err(&pdev->dev, "Could not allocate memory\n");
1388 ret = -ENOMEM;
1389 goto err_free;
1390 }
1391
1392 dc->pdev = pdev;
1393
1394 ret = pci_enable_device(dc->pdev);
1395 if (ret) {
1396 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1397 goto err_free;
1398 }
1399
1400 ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1401 if (ret) {
1402 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1403 (int) /* nozomi_private.io_addr */ 0);
1404 goto err_disable_device;
1405 }
1406
1407 start = pci_resource_start(dc->pdev, 0);
1408 if (start == 0) {
1409 dev_err(&pdev->dev, "No I/O address for card detected\n");
1410 ret = -ENODEV;
1411 goto err_rel_regs;
1412 }
1413
1414 /* Find out what card type it is */
1415 nozomi_get_card_type(dc);
1416
1417 dc->base_addr = ioremap_nocache(start, dc->card_type);
1418 if (!dc->base_addr) {
1419 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1420 ret = -ENODEV;
1421 goto err_rel_regs;
1422 }
1423
1424 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1425 if (!dc->send_buf) {
1426 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1427 ret = -ENOMEM;
1428 goto err_free_sbuf;
1429 }
1430
1431 spin_lock_init(&dc->spin_mutex);
1432
1433 nozomi_setup_private_data(dc);
1434
1435 /* Disable all interrupts */
1436 dc->last_ier = 0;
1437 writew(dc->last_ier, dc->reg_ier);
1438
1439 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1440 NOZOMI_NAME, dc);
1441 if (unlikely(ret)) {
1442 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1443 goto err_free_sbuf;
1444 }
1445
1446 DBG1("base_addr: %p", dc->base_addr);
1447
1448 make_sysfs_files(dc);
1449
1450 dc->index_start = ndev_idx * MAX_PORT;
1451 ndevs[ndev_idx] = dc;
1452
1453 pci_set_drvdata(pdev, dc);
1454
1455 /* Enable RESET interrupt */
1456 dc->last_ier = RESET;
1457 iowrite16(dc->last_ier, dc->reg_ier);
1458
1459 dc->state = NOZOMI_STATE_ENABLED;
1460
1461 for (i = 0; i < MAX_PORT; i++) {
1462 mutex_init(&dc->port[i].tty_sem);
1463 tty_port_init(&dc->port[i].port);
1464 tty_register_device(ntty_driver, dc->index_start + i,
1465 &pdev->dev);
1466 }
1467 return 0;
1468
1469 err_free_sbuf:
1470 kfree(dc->send_buf);
1471 iounmap(dc->base_addr);
1472 err_rel_regs:
1473 pci_release_regions(pdev);
1474 err_disable_device:
1475 pci_disable_device(pdev);
1476 err_free:
1477 kfree(dc);
1478 err:
1479 return ret;
1480 }
1481
1482 static void __devexit tty_exit(struct nozomi *dc)
1483 {
1484 unsigned int i;
1485
1486 DBG1(" ");
1487
1488 flush_scheduled_work();
1489
1490 for (i = 0; i < MAX_PORT; ++i) {
1491 struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
1492 if (tty && list_empty(&tty->hangup_work.entry))
1493 tty_hangup(tty);
1494 tty_kref_put(tty);
1495 }
1496 /* Racy below - surely should wait for scheduled work to be done or
1497 complete off a hangup method ? */
1498 while (dc->open_ttys)
1499 msleep(1);
1500 for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1501 tty_unregister_device(ntty_driver, i);
1502 }
1503
1504 /* Deallocate memory for one device */
1505 static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1506 {
1507 int i;
1508 struct ctrl_ul ctrl;
1509 struct nozomi *dc = pci_get_drvdata(pdev);
1510
1511 /* Disable all interrupts */
1512 dc->last_ier = 0;
1513 writew(dc->last_ier, dc->reg_ier);
1514
1515 tty_exit(dc);
1516
1517 /* Send 0x0001, command card to resend the reset token. */
1518 /* This is to get the reset when the module is reloaded. */
1519 ctrl.port = 0x00;
1520 ctrl.reserved = 0;
1521 ctrl.RTS = 0;
1522 ctrl.DTR = 1;
1523 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1524
1525 /* Setup dc->reg addresses to we can use defines here */
1526 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1527 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
1528
1529 remove_sysfs_files(dc);
1530
1531 free_irq(pdev->irq, dc);
1532
1533 for (i = 0; i < MAX_PORT; i++)
1534 if (dc->port[i].fifo_ul)
1535 kfifo_free(dc->port[i].fifo_ul);
1536
1537 kfree(dc->send_buf);
1538
1539 iounmap(dc->base_addr);
1540
1541 pci_release_regions(pdev);
1542
1543 pci_disable_device(pdev);
1544
1545 ndevs[dc->index_start / MAX_PORT] = NULL;
1546
1547 kfree(dc);
1548 }
1549
1550 static void set_rts(const struct tty_struct *tty, int rts)
1551 {
1552 struct port *port = get_port_by_tty(tty);
1553
1554 port->ctrl_ul.RTS = rts;
1555 port->update_flow_control = 1;
1556 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1557 }
1558
1559 static void set_dtr(const struct tty_struct *tty, int dtr)
1560 {
1561 struct port *port = get_port_by_tty(tty);
1562
1563 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1564
1565 port->ctrl_ul.DTR = dtr;
1566 port->update_flow_control = 1;
1567 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1568 }
1569
1570 /*
1571 * ----------------------------------------------------------------------------
1572 * TTY code
1573 * ----------------------------------------------------------------------------
1574 */
1575
1576 /* Called when the userspace process opens the tty, /dev/noz*. */
1577 static int ntty_open(struct tty_struct *tty, struct file *file)
1578 {
1579 struct port *port = get_port_by_tty(tty);
1580 struct nozomi *dc = get_dc_by_tty(tty);
1581 unsigned long flags;
1582
1583 if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1584 return -ENODEV;
1585
1586 if (mutex_lock_interruptible(&port->tty_sem))
1587 return -ERESTARTSYS;
1588
1589 port->port.count++;
1590 dc->open_ttys++;
1591
1592 /* Enable interrupt downlink for channel */
1593 if (port->port.count == 1) {
1594 /* FIXME: is this needed now ? */
1595 tty->low_latency = 1;
1596 tty->driver_data = port;
1597 tty_port_tty_set(&port->port, tty);
1598 DBG1("open: %d", port->token_dl);
1599 spin_lock_irqsave(&dc->spin_mutex, flags);
1600 dc->last_ier = dc->last_ier | port->token_dl;
1601 writew(dc->last_ier, dc->reg_ier);
1602 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1603 }
1604 mutex_unlock(&port->tty_sem);
1605 return 0;
1606 }
1607
1608 /* Called when the userspace process close the tty, /dev/noz*. Also
1609 called immediately if ntty_open fails in which case tty->driver_data
1610 will be NULL an we exit by the first return */
1611
1612 static void ntty_close(struct tty_struct *tty, struct file *file)
1613 {
1614 struct nozomi *dc = get_dc_by_tty(tty);
1615 struct port *nport = tty->driver_data;
1616 struct tty_port *port = &nport->port;
1617 unsigned long flags;
1618
1619 if (!dc || !nport)
1620 return;
1621
1622 /* Users cannot interrupt a close */
1623 mutex_lock(&nport->tty_sem);
1624
1625 WARN_ON(!port->count);
1626
1627 dc->open_ttys--;
1628 port->count--;
1629 tty_port_tty_set(port, NULL);
1630
1631 if (port->count == 0) {
1632 DBG1("close: %d", nport->token_dl);
1633 spin_lock_irqsave(&dc->spin_mutex, flags);
1634 dc->last_ier &= ~(nport->token_dl);
1635 writew(dc->last_ier, dc->reg_ier);
1636 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1637 }
1638 mutex_unlock(&nport->tty_sem);
1639 }
1640
1641 /*
1642 * called when the userspace process writes to the tty (/dev/noz*).
1643 * Data is inserted into a fifo, which is then read and transfered to the modem.
1644 */
1645 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1646 int count)
1647 {
1648 int rval = -EINVAL;
1649 struct nozomi *dc = get_dc_by_tty(tty);
1650 struct port *port = tty->driver_data;
1651 unsigned long flags;
1652
1653 /* DBG1( "WRITEx: %d, index = %d", count, index); */
1654
1655 if (!dc || !port)
1656 return -ENODEV;
1657
1658 if (unlikely(!mutex_trylock(&port->tty_sem))) {
1659 /*
1660 * must test lock as tty layer wraps calls
1661 * to this function with BKL
1662 */
1663 dev_err(&dc->pdev->dev, "Would have deadlocked - "
1664 "return EAGAIN\n");
1665 return -EAGAIN;
1666 }
1667
1668 if (unlikely(!port->port.count)) {
1669 DBG1(" ");
1670 goto exit;
1671 }
1672
1673 rval = __kfifo_put(port->fifo_ul, (unsigned char *)buffer, count);
1674
1675 /* notify card */
1676 if (unlikely(dc == NULL)) {
1677 DBG1("No device context?");
1678 goto exit;
1679 }
1680
1681 spin_lock_irqsave(&dc->spin_mutex, flags);
1682 /* CTS is only valid on the modem channel */
1683 if (port == &(dc->port[PORT_MDM])) {
1684 if (port->ctrl_dl.CTS) {
1685 DBG4("Enable interrupt");
1686 enable_transmit_ul(tty->index % MAX_PORT, dc);
1687 } else {
1688 dev_err(&dc->pdev->dev,
1689 "CTS not active on modem port?\n");
1690 }
1691 } else {
1692 enable_transmit_ul(tty->index % MAX_PORT, dc);
1693 }
1694 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1695
1696 exit:
1697 mutex_unlock(&port->tty_sem);
1698 return rval;
1699 }
1700
1701 /*
1702 * Calculate how much is left in device
1703 * This method is called by the upper tty layer.
1704 * #according to sources N_TTY.c it expects a value >= 0 and
1705 * does not check for negative values.
1706 */
1707 static int ntty_write_room(struct tty_struct *tty)
1708 {
1709 struct port *port = tty->driver_data;
1710 int room = 0;
1711 const struct nozomi *dc = get_dc_by_tty(tty);
1712
1713 if (!dc || !port)
1714 return 0;
1715 if (!mutex_trylock(&port->tty_sem))
1716 return 0;
1717
1718 if (!port->port.count)
1719 goto exit;
1720
1721 room = port->fifo_ul->size - __kfifo_len(port->fifo_ul);
1722
1723 exit:
1724 mutex_unlock(&port->tty_sem);
1725 return room;
1726 }
1727
1728 /* Gets io control parameters */
1729 static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1730 {
1731 const struct port *port = tty->driver_data;
1732 const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1733 const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1734
1735 /* Note: these could change under us but it is not clear this
1736 matters if so */
1737 return (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1738 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1739 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1740 (ctrl_dl->RI ? TIOCM_RNG : 0) |
1741 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1742 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1743 }
1744
1745 /* Sets io controls parameters */
1746 static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1747 unsigned int set, unsigned int clear)
1748 {
1749 struct nozomi *dc = get_dc_by_tty(tty);
1750 unsigned long flags;
1751
1752 spin_lock_irqsave(&dc->spin_mutex, flags);
1753 if (set & TIOCM_RTS)
1754 set_rts(tty, 1);
1755 else if (clear & TIOCM_RTS)
1756 set_rts(tty, 0);
1757
1758 if (set & TIOCM_DTR)
1759 set_dtr(tty, 1);
1760 else if (clear & TIOCM_DTR)
1761 set_dtr(tty, 0);
1762 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1763
1764 return 0;
1765 }
1766
1767 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1768 struct async_icount *cprev)
1769 {
1770 const struct async_icount cnow = port->tty_icount;
1771 int ret;
1772
1773 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1774 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1775 ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1776 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1777
1778 *cprev = cnow;
1779
1780 return ret;
1781 }
1782
1783 static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1784 {
1785 const struct async_icount cnow = port->tty_icount;
1786 struct serial_icounter_struct icount;
1787
1788 icount.cts = cnow.cts;
1789 icount.dsr = cnow.dsr;
1790 icount.rng = cnow.rng;
1791 icount.dcd = cnow.dcd;
1792 icount.rx = cnow.rx;
1793 icount.tx = cnow.tx;
1794 icount.frame = cnow.frame;
1795 icount.overrun = cnow.overrun;
1796 icount.parity = cnow.parity;
1797 icount.brk = cnow.brk;
1798 icount.buf_overrun = cnow.buf_overrun;
1799
1800 return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
1801 }
1802
1803 static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1804 unsigned int cmd, unsigned long arg)
1805 {
1806 struct port *port = tty->driver_data;
1807 void __user *argp = (void __user *)arg;
1808 int rval = -ENOIOCTLCMD;
1809
1810 DBG1("******** IOCTL, cmd: %d", cmd);
1811
1812 switch (cmd) {
1813 case TIOCMIWAIT: {
1814 struct async_icount cprev = port->tty_icount;
1815
1816 rval = wait_event_interruptible(port->tty_wait,
1817 ntty_cflags_changed(port, arg, &cprev));
1818 break;
1819 } case TIOCGICOUNT:
1820 rval = ntty_ioctl_tiocgicount(port, argp);
1821 break;
1822 default:
1823 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1824 break;
1825 };
1826
1827 return rval;
1828 }
1829
1830 /*
1831 * Called by the upper tty layer when tty buffers are ready
1832 * to receive data again after a call to throttle.
1833 */
1834 static void ntty_unthrottle(struct tty_struct *tty)
1835 {
1836 struct nozomi *dc = get_dc_by_tty(tty);
1837 unsigned long flags;
1838
1839 DBG1("UNTHROTTLE");
1840 spin_lock_irqsave(&dc->spin_mutex, flags);
1841 enable_transmit_dl(tty->index % MAX_PORT, dc);
1842 set_rts(tty, 1);
1843
1844 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1845 }
1846
1847 /*
1848 * Called by the upper tty layer when the tty buffers are almost full.
1849 * The driver should stop send more data.
1850 */
1851 static void ntty_throttle(struct tty_struct *tty)
1852 {
1853 struct nozomi *dc = get_dc_by_tty(tty);
1854 unsigned long flags;
1855
1856 DBG1("THROTTLE");
1857 spin_lock_irqsave(&dc->spin_mutex, flags);
1858 set_rts(tty, 0);
1859 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1860 }
1861
1862 /* Returns number of chars in buffer, called by tty layer */
1863 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1864 {
1865 struct port *port = tty->driver_data;
1866 struct nozomi *dc = get_dc_by_tty(tty);
1867 s32 rval;
1868
1869 if (unlikely(!dc || !port)) {
1870 rval = -ENODEV;
1871 goto exit_in_buffer;
1872 }
1873
1874 if (unlikely(!port->port.count)) {
1875 dev_err(&dc->pdev->dev, "No tty open?\n");
1876 rval = -ENODEV;
1877 goto exit_in_buffer;
1878 }
1879
1880 rval = __kfifo_len(port->fifo_ul);
1881
1882 exit_in_buffer:
1883 return rval;
1884 }
1885
1886 static const struct tty_operations tty_ops = {
1887 .ioctl = ntty_ioctl,
1888 .open = ntty_open,
1889 .close = ntty_close,
1890 .write = ntty_write,
1891 .write_room = ntty_write_room,
1892 .unthrottle = ntty_unthrottle,
1893 .throttle = ntty_throttle,
1894 .chars_in_buffer = ntty_chars_in_buffer,
1895 .tiocmget = ntty_tiocmget,
1896 .tiocmset = ntty_tiocmset,
1897 };
1898
1899 /* Module initialization */
1900 static struct pci_driver nozomi_driver = {
1901 .name = NOZOMI_NAME,
1902 .id_table = nozomi_pci_tbl,
1903 .probe = nozomi_card_init,
1904 .remove = __devexit_p(nozomi_card_exit),
1905 };
1906
1907 static __init int nozomi_init(void)
1908 {
1909 int ret;
1910
1911 printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1912
1913 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1914 if (!ntty_driver)
1915 return -ENOMEM;
1916
1917 ntty_driver->owner = THIS_MODULE;
1918 ntty_driver->driver_name = NOZOMI_NAME_TTY;
1919 ntty_driver->name = "noz";
1920 ntty_driver->major = 0;
1921 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1922 ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1923 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1924 ntty_driver->init_termios = tty_std_termios;
1925 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1926 HUPCL | CLOCAL;
1927 ntty_driver->init_termios.c_ispeed = 115200;
1928 ntty_driver->init_termios.c_ospeed = 115200;
1929 tty_set_operations(ntty_driver, &tty_ops);
1930
1931 ret = tty_register_driver(ntty_driver);
1932 if (ret) {
1933 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1934 goto free_tty;
1935 }
1936
1937 ret = pci_register_driver(&nozomi_driver);
1938 if (ret) {
1939 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1940 goto unr_tty;
1941 }
1942
1943 return 0;
1944 unr_tty:
1945 tty_unregister_driver(ntty_driver);
1946 free_tty:
1947 put_tty_driver(ntty_driver);
1948 return ret;
1949 }
1950
1951 static __exit void nozomi_exit(void)
1952 {
1953 printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1954 pci_unregister_driver(&nozomi_driver);
1955 tty_unregister_driver(ntty_driver);
1956 put_tty_driver(ntty_driver);
1957 }
1958
1959 module_init(nozomi_init);
1960 module_exit(nozomi_exit);
1961
1962 module_param(debug, int, S_IRUGO | S_IWUSR);
1963
1964 MODULE_LICENSE("Dual BSD/GPL");
1965 MODULE_DESCRIPTION(DRIVER_DESC);
Support for the Chinese Samsung S3C2440 based development boards