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net/mlx5e: Fix wrong indications in DIM due to counter wraparound
[linux/fpc-iii.git] / drivers / tty / nozomi.c
blobd6fd0e802ef512732951bc6e8eaca099ce7bfc1d
1 /*
2 * nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
3 *
4 * Written by: Ulf Jakobsson,
5 * Jan Åkerfeldt,
6 * Stefan Thomasson,
7 *
8 * Maintained by: Paul Hardwick (p.hardwick@option.com)
9 *
10 * Patches:
11 * Locking code changes for Vodafone by Sphere Systems Ltd,
12 * Andrew Bird (ajb@spheresystems.co.uk )
13 * & Phil Sanderson
14 *
15 * Source has been ported from an implementation made by Filip Aben @ Option
16 *
17 * --------------------------------------------------------------------------
18 *
19 * Copyright (c) 2005,2006 Option Wireless Sweden AB
20 * Copyright (c) 2006 Sphere Systems Ltd
21 * Copyright (c) 2006 Option Wireless n/v
22 * All rights Reserved.
23 *
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License, or
27 * (at your option) any later version.
28 *
29 * This program is distributed in the hope that it will be useful,
30 * but WITHOUT ANY WARRANTY; without even the implied warranty of
31 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
32 * GNU General Public License for more details.
33 *
34 * You should have received a copy of the GNU General Public License
35 * along with this program; if not, write to the Free Software
36 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
37 *
38 * --------------------------------------------------------------------------
39 */
40
41 /* Enable this to have a lot of debug printouts */
42 #define DEBUG
43
44 #include <linux/kernel.h>
45 #include <linux/module.h>
46 #include <linux/pci.h>
47 #include <linux/ioport.h>
48 #include <linux/tty.h>
49 #include <linux/tty_driver.h>
50 #include <linux/tty_flip.h>
51 #include <linux/sched.h>
52 #include <linux/serial.h>
53 #include <linux/interrupt.h>
54 #include <linux/kmod.h>
55 #include <linux/init.h>
56 #include <linux/kfifo.h>
57 #include <linux/uaccess.h>
58 #include <linux/slab.h>
59 #include <asm/byteorder.h>
60
61 #include <linux/delay.h>
62
63
64 #define VERSION_STRING DRIVER_DESC " 2.1d"
65
66 /* Macros definitions */
67
68 /* Default debug printout level */
69 #define NOZOMI_DEBUG_LEVEL 0x00
70
71 #define P_BUF_SIZE 128
72 #define NFO(_err_flag_, args...) \
73 do { \
74 char tmp[P_BUF_SIZE]; \
75 snprintf(tmp, sizeof(tmp), ##args); \
76 printk(_err_flag_ "[%d] %s(): %s\n", __LINE__, \
77 __func__, tmp); \
78 } while (0)
79
80 #define DBG1(args...) D_(0x01, ##args)
81 #define DBG2(args...) D_(0x02, ##args)
82 #define DBG3(args...) D_(0x04, ##args)
83 #define DBG4(args...) D_(0x08, ##args)
84 #define DBG5(args...) D_(0x10, ##args)
85 #define DBG6(args...) D_(0x20, ##args)
86 #define DBG7(args...) D_(0x40, ##args)
87 #define DBG8(args...) D_(0x80, ##args)
88
89 #ifdef DEBUG
90 /* Do we need this settable at runtime? */
91 static int debug = NOZOMI_DEBUG_LEVEL;
92
93 #define D(lvl, args...) do \
94 {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
95 while (0)
96 #define D_(lvl, args...) D(lvl, ##args)
97
98 /* These printouts are always printed */
99
100 #else
101 static int debug;
102 #define D_(lvl, args...)
103 #endif
104
105 /* TODO: rewrite to optimize macros... */
106
107 #define TMP_BUF_MAX 256
108
109 #define DUMP(buf__,len__) \
110 do { \
111 char tbuf[TMP_BUF_MAX] = {0};\
112 if (len__ > 1) {\
113 snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
114 if (tbuf[len__-2] == '\r') {\
115 tbuf[len__-2] = 'r';\
116 } \
117 DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
118 } else {\
119 DBG1("SENDING: '%s' (%d)", tbuf, len__);\
120 } \
121 } while (0)
122
123 /* Defines */
124 #define NOZOMI_NAME "nozomi"
125 #define NOZOMI_NAME_TTY "nozomi_tty"
126 #define DRIVER_DESC "Nozomi driver"
127
128 #define NTTY_TTY_MAXMINORS 256
129 #define NTTY_FIFO_BUFFER_SIZE 8192
130
131 /* Must be power of 2 */
132 #define FIFO_BUFFER_SIZE_UL 8192
133
134 /* Size of tmp send buffer to card */
135 #define SEND_BUF_MAX 1024
136 #define RECEIVE_BUF_MAX 4
137
138
139 #define R_IIR 0x0000 /* Interrupt Identity Register */
140 #define R_FCR 0x0000 /* Flow Control Register */
141 #define R_IER 0x0004 /* Interrupt Enable Register */
142
143 #define NOZOMI_CONFIG_MAGIC 0xEFEFFEFE
144 #define TOGGLE_VALID 0x0000
145
146 /* Definition of interrupt tokens */
147 #define MDM_DL1 0x0001
148 #define MDM_UL1 0x0002
149 #define MDM_DL2 0x0004
150 #define MDM_UL2 0x0008
151 #define DIAG_DL1 0x0010
152 #define DIAG_DL2 0x0020
153 #define DIAG_UL 0x0040
154 #define APP1_DL 0x0080
155 #define APP1_UL 0x0100
156 #define APP2_DL 0x0200
157 #define APP2_UL 0x0400
158 #define CTRL_DL 0x0800
159 #define CTRL_UL 0x1000
160 #define RESET 0x8000
161
162 #define MDM_DL (MDM_DL1 | MDM_DL2)
163 #define MDM_UL (MDM_UL1 | MDM_UL2)
164 #define DIAG_DL (DIAG_DL1 | DIAG_DL2)
165
166 /* modem signal definition */
167 #define CTRL_DSR 0x0001
168 #define CTRL_DCD 0x0002
169 #define CTRL_RI 0x0004
170 #define CTRL_CTS 0x0008
171
172 #define CTRL_DTR 0x0001
173 #define CTRL_RTS 0x0002
174
175 #define MAX_PORT 4
176 #define NOZOMI_MAX_PORTS 5
177 #define NOZOMI_MAX_CARDS (NTTY_TTY_MAXMINORS / MAX_PORT)
178
179 /* Type definitions */
180
181 /*
182 * There are two types of nozomi cards,
183 * one with 2048 memory and with 8192 memory
184 */
185 enum card_type {
186 F32_2 = 2048, /* 512 bytes downlink + uplink * 2 -> 2048 */
187 F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
188 };
189
190 /* Initialization states a card can be in */
191 enum card_state {
192 NOZOMI_STATE_UKNOWN = 0,
193 NOZOMI_STATE_ENABLED = 1, /* pci device enabled */
194 NOZOMI_STATE_ALLOCATED = 2, /* config setup done */
195 NOZOMI_STATE_READY = 3, /* flowcontrols received */
196 };
197
198 /* Two different toggle channels exist */
199 enum channel_type {
200 CH_A = 0,
201 CH_B = 1,
202 };
203
204 /* Port definition for the card regarding flow control */
205 enum ctrl_port_type {
206 CTRL_CMD = 0,
207 CTRL_MDM = 1,
208 CTRL_DIAG = 2,
209 CTRL_APP1 = 3,
210 CTRL_APP2 = 4,
211 CTRL_ERROR = -1,
212 };
213
214 /* Ports that the nozomi has */
215 enum port_type {
216 PORT_MDM = 0,
217 PORT_DIAG = 1,
218 PORT_APP1 = 2,
219 PORT_APP2 = 3,
220 PORT_CTRL = 4,
221 PORT_ERROR = -1,
222 };
223
224 #ifdef __BIG_ENDIAN
225 /* Big endian */
226
227 struct toggles {
228 unsigned int enabled:5; /*
229 * Toggle fields are valid if enabled is 0,
230 * else A-channels must always be used.
231 */
232 unsigned int diag_dl:1;
233 unsigned int mdm_dl:1;
234 unsigned int mdm_ul:1;
235 } __attribute__ ((packed));
236
237 /* Configuration table to read at startup of card */
238 /* Is for now only needed during initialization phase */
239 struct config_table {
240 u32 signature;
241 u16 product_information;
242 u16 version;
243 u8 pad3[3];
244 struct toggles toggle;
245 u8 pad1[4];
246 u16 dl_mdm_len1; /*
247 * If this is 64, it can hold
248 * 60 bytes + 4 that is length field
249 */
250 u16 dl_start;
251
252 u16 dl_diag_len1;
253 u16 dl_mdm_len2; /*
254 * If this is 64, it can hold
255 * 60 bytes + 4 that is length field
256 */
257 u16 dl_app1_len;
258
259 u16 dl_diag_len2;
260 u16 dl_ctrl_len;
261 u16 dl_app2_len;
262 u8 pad2[16];
263 u16 ul_mdm_len1;
264 u16 ul_start;
265 u16 ul_diag_len;
266 u16 ul_mdm_len2;
267 u16 ul_app1_len;
268 u16 ul_app2_len;
269 u16 ul_ctrl_len;
270 } __attribute__ ((packed));
271
272 /* This stores all control downlink flags */
273 struct ctrl_dl {
274 u8 port;
275 unsigned int reserved:4;
276 unsigned int CTS:1;
277 unsigned int RI:1;
278 unsigned int DCD:1;
279 unsigned int DSR:1;
280 } __attribute__ ((packed));
281
282 /* This stores all control uplink flags */
283 struct ctrl_ul {
284 u8 port;
285 unsigned int reserved:6;
286 unsigned int RTS:1;
287 unsigned int DTR:1;
288 } __attribute__ ((packed));
289
290 #else
291 /* Little endian */
292
293 /* This represents the toggle information */
294 struct toggles {
295 unsigned int mdm_ul:1;
296 unsigned int mdm_dl:1;
297 unsigned int diag_dl:1;
298 unsigned int enabled:5; /*
299 * Toggle fields are valid if enabled is 0,
300 * else A-channels must always be used.
301 */
302 } __attribute__ ((packed));
303
304 /* Configuration table to read at startup of card */
305 struct config_table {
306 u32 signature;
307 u16 version;
308 u16 product_information;
309 struct toggles toggle;
310 u8 pad1[7];
311 u16 dl_start;
312 u16 dl_mdm_len1; /*
313 * If this is 64, it can hold
314 * 60 bytes + 4 that is length field
315 */
316 u16 dl_mdm_len2;
317 u16 dl_diag_len1;
318 u16 dl_diag_len2;
319 u16 dl_app1_len;
320 u16 dl_app2_len;
321 u16 dl_ctrl_len;
322 u8 pad2[16];
323 u16 ul_start;
324 u16 ul_mdm_len2;
325 u16 ul_mdm_len1;
326 u16 ul_diag_len;
327 u16 ul_app1_len;
328 u16 ul_app2_len;
329 u16 ul_ctrl_len;
330 } __attribute__ ((packed));
331
332 /* This stores all control downlink flags */
333 struct ctrl_dl {
334 unsigned int DSR:1;
335 unsigned int DCD:1;
336 unsigned int RI:1;
337 unsigned int CTS:1;
338 unsigned int reserverd:4;
339 u8 port;
340 } __attribute__ ((packed));
341
342 /* This stores all control uplink flags */
343 struct ctrl_ul {
344 unsigned int DTR:1;
345 unsigned int RTS:1;
346 unsigned int reserved:6;
347 u8 port;
348 } __attribute__ ((packed));
349 #endif
350
351 /* This holds all information that is needed regarding a port */
352 struct port {
353 struct tty_port port;
354 u8 update_flow_control;
355 struct ctrl_ul ctrl_ul;
356 struct ctrl_dl ctrl_dl;
357 struct kfifo fifo_ul;
358 void __iomem *dl_addr[2];
359 u32 dl_size[2];
360 u8 toggle_dl;
361 void __iomem *ul_addr[2];
362 u32 ul_size[2];
363 u8 toggle_ul;
364 u16 token_dl;
365
366 wait_queue_head_t tty_wait;
367 struct async_icount tty_icount;
368
369 struct nozomi *dc;
370 };
371
372 /* Private data one for each card in the system */
373 struct nozomi {
374 void __iomem *base_addr;
375 unsigned long flip;
376
377 /* Pointers to registers */
378 void __iomem *reg_iir;
379 void __iomem *reg_fcr;
380 void __iomem *reg_ier;
381
382 u16 last_ier;
383 enum card_type card_type;
384 struct config_table config_table; /* Configuration table */
385 struct pci_dev *pdev;
386 struct port port[NOZOMI_MAX_PORTS];
387 u8 *send_buf;
388
389 spinlock_t spin_mutex; /* secures access to registers and tty */
390
391 unsigned int index_start;
392 enum card_state state;
393 u32 open_ttys;
394 };
395
396 /* This is a data packet that is read or written to/from card */
397 struct buffer {
398 u32 size; /* size is the length of the data buffer */
399 u8 *data;
400 } __attribute__ ((packed));
401
402 /* Global variables */
403 static const struct pci_device_id nozomi_pci_tbl[] = {
404 {PCI_DEVICE(0x1931, 0x000c)}, /* Nozomi HSDPA */
405 {},
406 };
407
408 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
409
410 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
411 static struct tty_driver *ntty_driver;
412
413 static const struct tty_port_operations noz_tty_port_ops;
414
415 /*
416 * find card by tty_index
417 */
418 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
419 {
420 return tty ? ndevs[tty->index / MAX_PORT] : NULL;
421 }
422
423 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
424 {
425 struct nozomi *ndev = get_dc_by_tty(tty);
426 return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
427 }
428
429 /*
430 * TODO:
431 * -Optimize
432 * -Rewrite cleaner
433 */
434
435 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
436 u32 size_bytes)
437 {
438 u32 i = 0;
439 const u32 __iomem *ptr = mem_addr_start;
440 u16 *buf16;
441
442 if (unlikely(!ptr || !buf))
443 goto out;
444
445 /* shortcut for extremely often used cases */
446 switch (size_bytes) {
447 case 2: /* 2 bytes */
448 buf16 = (u16 *) buf;
449 *buf16 = __le16_to_cpu(readw(ptr));
450 goto out;
451 break;
452 case 4: /* 4 bytes */
453 *(buf) = __le32_to_cpu(readl(ptr));
454 goto out;
455 break;
456 }
457
458 while (i < size_bytes) {
459 if (size_bytes - i == 2) {
460 /* Handle 2 bytes in the end */
461 buf16 = (u16 *) buf;
462 *(buf16) = __le16_to_cpu(readw(ptr));
463 i += 2;
464 } else {
465 /* Read 4 bytes */
466 *(buf) = __le32_to_cpu(readl(ptr));
467 i += 4;
468 }
469 buf++;
470 ptr++;
471 }
472 out:
473 return;
474 }
475
476 /*
477 * TODO:
478 * -Optimize
479 * -Rewrite cleaner
480 */
481 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
482 u32 size_bytes)
483 {
484 u32 i = 0;
485 u32 __iomem *ptr = mem_addr_start;
486 const u16 *buf16;
487
488 if (unlikely(!ptr || !buf))
489 return 0;
490
491 /* shortcut for extremely often used cases */
492 switch (size_bytes) {
493 case 2: /* 2 bytes */
494 buf16 = (const u16 *)buf;
495 writew(__cpu_to_le16(*buf16), ptr);
496 return 2;
497 break;
498 case 1: /*
499 * also needs to write 4 bytes in this case
500 * so falling through..
501 */
502 case 4: /* 4 bytes */
503 writel(__cpu_to_le32(*buf), ptr);
504 return 4;
505 break;
506 }
507
508 while (i < size_bytes) {
509 if (size_bytes - i == 2) {
510 /* 2 bytes */
511 buf16 = (const u16 *)buf;
512 writew(__cpu_to_le16(*buf16), ptr);
513 i += 2;
514 } else {
515 /* 4 bytes */
516 writel(__cpu_to_le32(*buf), ptr);
517 i += 4;
518 }
519 buf++;
520 ptr++;
521 }
522 return i;
523 }
524
525 /* Setup pointers to different channels and also setup buffer sizes. */
526 static void nozomi_setup_memory(struct nozomi *dc)
527 {
528 void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
529 /* The length reported is including the length field of 4 bytes,
530 * hence subtract with 4.
531 */
532 const u16 buff_offset = 4;
533
534 /* Modem port dl configuration */
535 dc->port[PORT_MDM].dl_addr[CH_A] = offset;
536 dc->port[PORT_MDM].dl_addr[CH_B] =
537 (offset += dc->config_table.dl_mdm_len1);
538 dc->port[PORT_MDM].dl_size[CH_A] =
539 dc->config_table.dl_mdm_len1 - buff_offset;
540 dc->port[PORT_MDM].dl_size[CH_B] =
541 dc->config_table.dl_mdm_len2 - buff_offset;
542
543 /* Diag port dl configuration */
544 dc->port[PORT_DIAG].dl_addr[CH_A] =
545 (offset += dc->config_table.dl_mdm_len2);
546 dc->port[PORT_DIAG].dl_size[CH_A] =
547 dc->config_table.dl_diag_len1 - buff_offset;
548 dc->port[PORT_DIAG].dl_addr[CH_B] =
549 (offset += dc->config_table.dl_diag_len1);
550 dc->port[PORT_DIAG].dl_size[CH_B] =
551 dc->config_table.dl_diag_len2 - buff_offset;
552
553 /* App1 port dl configuration */
554 dc->port[PORT_APP1].dl_addr[CH_A] =
555 (offset += dc->config_table.dl_diag_len2);
556 dc->port[PORT_APP1].dl_size[CH_A] =
557 dc->config_table.dl_app1_len - buff_offset;
558
559 /* App2 port dl configuration */
560 dc->port[PORT_APP2].dl_addr[CH_A] =
561 (offset += dc->config_table.dl_app1_len);
562 dc->port[PORT_APP2].dl_size[CH_A] =
563 dc->config_table.dl_app2_len - buff_offset;
564
565 /* Ctrl dl configuration */
566 dc->port[PORT_CTRL].dl_addr[CH_A] =
567 (offset += dc->config_table.dl_app2_len);
568 dc->port[PORT_CTRL].dl_size[CH_A] =
569 dc->config_table.dl_ctrl_len - buff_offset;
570
571 offset = dc->base_addr + dc->config_table.ul_start;
572
573 /* Modem Port ul configuration */
574 dc->port[PORT_MDM].ul_addr[CH_A] = offset;
575 dc->port[PORT_MDM].ul_size[CH_A] =
576 dc->config_table.ul_mdm_len1 - buff_offset;
577 dc->port[PORT_MDM].ul_addr[CH_B] =
578 (offset += dc->config_table.ul_mdm_len1);
579 dc->port[PORT_MDM].ul_size[CH_B] =
580 dc->config_table.ul_mdm_len2 - buff_offset;
581
582 /* Diag port ul configuration */
583 dc->port[PORT_DIAG].ul_addr[CH_A] =
584 (offset += dc->config_table.ul_mdm_len2);
585 dc->port[PORT_DIAG].ul_size[CH_A] =
586 dc->config_table.ul_diag_len - buff_offset;
587
588 /* App1 port ul configuration */
589 dc->port[PORT_APP1].ul_addr[CH_A] =
590 (offset += dc->config_table.ul_diag_len);
591 dc->port[PORT_APP1].ul_size[CH_A] =
592 dc->config_table.ul_app1_len - buff_offset;
593
594 /* App2 port ul configuration */
595 dc->port[PORT_APP2].ul_addr[CH_A] =
596 (offset += dc->config_table.ul_app1_len);
597 dc->port[PORT_APP2].ul_size[CH_A] =
598 dc->config_table.ul_app2_len - buff_offset;
599
600 /* Ctrl ul configuration */
601 dc->port[PORT_CTRL].ul_addr[CH_A] =
602 (offset += dc->config_table.ul_app2_len);
603 dc->port[PORT_CTRL].ul_size[CH_A] =
604 dc->config_table.ul_ctrl_len - buff_offset;
605 }
606
607 /* Dump config table under initalization phase */
608 #ifdef DEBUG
609 static void dump_table(const struct nozomi *dc)
610 {
611 DBG3("signature: 0x%08X", dc->config_table.signature);
612 DBG3("version: 0x%04X", dc->config_table.version);
613 DBG3("product_information: 0x%04X", \
614 dc->config_table.product_information);
615 DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
616 DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
617 DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
618 DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
619
620 DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
621 DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
622 dc->config_table.dl_mdm_len1);
623 DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
624 dc->config_table.dl_mdm_len2);
625 DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
626 dc->config_table.dl_diag_len1);
627 DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
628 dc->config_table.dl_diag_len2);
629 DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
630 dc->config_table.dl_app1_len);
631 DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
632 dc->config_table.dl_app2_len);
633 DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
634 dc->config_table.dl_ctrl_len);
635 DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
636 dc->config_table.ul_start);
637 DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
638 dc->config_table.ul_mdm_len1);
639 DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
640 dc->config_table.ul_mdm_len2);
641 DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
642 dc->config_table.ul_diag_len);
643 DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
644 dc->config_table.ul_app1_len);
645 DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
646 dc->config_table.ul_app2_len);
647 DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
648 dc->config_table.ul_ctrl_len);
649 }
650 #else
651 static inline void dump_table(const struct nozomi *dc) { }
652 #endif
653
654 /*
655 * Read configuration table from card under intalization phase
656 * Returns 1 if ok, else 0
657 */
658 static int nozomi_read_config_table(struct nozomi *dc)
659 {
660 read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
661 sizeof(struct config_table));
662
663 if (dc->config_table.signature != NOZOMI_CONFIG_MAGIC) {
664 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
665 dc->config_table.signature, NOZOMI_CONFIG_MAGIC);
666 return 0;
667 }
668
669 if ((dc->config_table.version == 0)
670 || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
671 int i;
672 DBG1("Second phase, configuring card");
673
674 nozomi_setup_memory(dc);
675
676 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
677 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
678 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
679 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
680 dc->port[PORT_MDM].toggle_ul,
681 dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
682
683 dump_table(dc);
684
685 for (i = PORT_MDM; i < MAX_PORT; i++) {
686 memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
687 memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
688 }
689
690 /* Enable control channel */
691 dc->last_ier = dc->last_ier | CTRL_DL;
692 writew(dc->last_ier, dc->reg_ier);
693
694 dc->state = NOZOMI_STATE_ALLOCATED;
695 dev_info(&dc->pdev->dev, "Initialization OK!\n");
696 return 1;
697 }
698
699 if ((dc->config_table.version > 0)
700 && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
701 u32 offset = 0;
702 DBG1("First phase: pushing upload buffers, clearing download");
703
704 dev_info(&dc->pdev->dev, "Version of card: %d\n",
705 dc->config_table.version);
706
707 /* Here we should disable all I/O over F32. */
708 nozomi_setup_memory(dc);
709
710 /*
711 * We should send ALL channel pair tokens back along
712 * with reset token
713 */
714
715 /* push upload modem buffers */
716 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
717 (u32 *) &offset, 4);
718 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
719 (u32 *) &offset, 4);
720
721 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
722
723 DBG1("First phase done");
724 }
725
726 return 1;
727 }
728
729 /* Enable uplink interrupts */
730 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
731 {
732 static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
733
734 if (port < NOZOMI_MAX_PORTS) {
735 dc->last_ier |= mask[port];
736 writew(dc->last_ier, dc->reg_ier);
737 } else {
738 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
739 }
740 }
741
742 /* Disable uplink interrupts */
743 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
744 {
745 static const u16 mask[] =
746 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
747
748 if (port < NOZOMI_MAX_PORTS) {
749 dc->last_ier &= mask[port];
750 writew(dc->last_ier, dc->reg_ier);
751 } else {
752 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
753 }
754 }
755
756 /* Enable downlink interrupts */
757 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
758 {
759 static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
760
761 if (port < NOZOMI_MAX_PORTS) {
762 dc->last_ier |= mask[port];
763 writew(dc->last_ier, dc->reg_ier);
764 } else {
765 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
766 }
767 }
768
769 /* Disable downlink interrupts */
770 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
771 {
772 static const u16 mask[] =
773 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
774
775 if (port < NOZOMI_MAX_PORTS) {
776 dc->last_ier &= mask[port];
777 writew(dc->last_ier, dc->reg_ier);
778 } else {
779 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
780 }
781 }
782
783 /*
784 * Return 1 - send buffer to card and ack.
785 * Return 0 - don't ack, don't send buffer to card.
786 */
787 static int send_data(enum port_type index, struct nozomi *dc)
788 {
789 u32 size = 0;
790 struct port *port = &dc->port[index];
791 const u8 toggle = port->toggle_ul;
792 void __iomem *addr = port->ul_addr[toggle];
793 const u32 ul_size = port->ul_size[toggle];
794
795 /* Get data from tty and place in buf for now */
796 size = kfifo_out(&port->fifo_ul, dc->send_buf,
797 ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
798
799 if (size == 0) {
800 DBG4("No more data to send, disable link:");
801 return 0;
802 }
803
804 /* DUMP(buf, size); */
805
806 /* Write length + data */
807 write_mem32(addr, (u32 *) &size, 4);
808 write_mem32(addr + 4, (u32 *) dc->send_buf, size);
809
810 tty_port_tty_wakeup(&port->port);
811
812 return 1;
813 }
814
815 /* If all data has been read, return 1, else 0 */
816 static int receive_data(enum port_type index, struct nozomi *dc)
817 {
818 u8 buf[RECEIVE_BUF_MAX] = { 0 };
819 int size;
820 u32 offset = 4;
821 struct port *port = &dc->port[index];
822 void __iomem *addr = port->dl_addr[port->toggle_dl];
823 struct tty_struct *tty = tty_port_tty_get(&port->port);
824 int i, ret;
825
826 size = __le32_to_cpu(readl(addr));
827 /* DBG1( "%d bytes port: %d", size, index); */
828
829 if (tty && tty_throttled(tty)) {
830 DBG1("No room in tty, don't read data, don't ack interrupt, "
831 "disable interrupt");
832
833 /* disable interrupt in downlink... */
834 disable_transmit_dl(index, dc);
835 ret = 0;
836 goto put;
837 }
838
839 if (unlikely(size == 0)) {
840 dev_err(&dc->pdev->dev, "size == 0?\n");
841 ret = 1;
842 goto put;
843 }
844
845 while (size > 0) {
846 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
847
848 if (size == 1) {
849 tty_insert_flip_char(&port->port, buf[0], TTY_NORMAL);
850 size = 0;
851 } else if (size < RECEIVE_BUF_MAX) {
852 size -= tty_insert_flip_string(&port->port,
853 (char *)buf, size);
854 } else {
855 i = tty_insert_flip_string(&port->port,
856 (char *)buf, RECEIVE_BUF_MAX);
857 size -= i;
858 offset += i;
859 }
860 }
861
862 set_bit(index, &dc->flip);
863 ret = 1;
864 put:
865 tty_kref_put(tty);
866 return ret;
867 }
868
869 /* Debug for interrupts */
870 #ifdef DEBUG
871 static char *interrupt2str(u16 interrupt)
872 {
873 static char buf[TMP_BUF_MAX];
874 char *p = buf;
875
876 interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
877 interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
878 "MDM_DL2 ") : NULL;
879
880 interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
881 "MDM_UL1 ") : NULL;
882 interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
883 "MDM_UL2 ") : NULL;
884
885 interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
886 "DIAG_DL1 ") : NULL;
887 interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
888 "DIAG_DL2 ") : NULL;
889
890 interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
891 "DIAG_UL ") : NULL;
892
893 interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
894 "APP1_DL ") : NULL;
895 interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
896 "APP2_DL ") : NULL;
897
898 interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
899 "APP1_UL ") : NULL;
900 interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
901 "APP2_UL ") : NULL;
902
903 interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
904 "CTRL_DL ") : NULL;
905 interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
906 "CTRL_UL ") : NULL;
907
908 interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
909 "RESET ") : NULL;
910
911 return buf;
912 }
913 #endif
914
915 /*
916 * Receive flow control
917 * Return 1 - If ok, else 0
918 */
919 static int receive_flow_control(struct nozomi *dc)
920 {
921 enum port_type port = PORT_MDM;
922 struct ctrl_dl ctrl_dl;
923 struct ctrl_dl old_ctrl;
924 u16 enable_ier = 0;
925
926 read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
927
928 switch (ctrl_dl.port) {
929 case CTRL_CMD:
930 DBG1("The Base Band sends this value as a response to a "
931 "request for IMSI detach sent over the control "
932 "channel uplink (see section 7.6.1).");
933 break;
934 case CTRL_MDM:
935 port = PORT_MDM;
936 enable_ier = MDM_DL;
937 break;
938 case CTRL_DIAG:
939 port = PORT_DIAG;
940 enable_ier = DIAG_DL;
941 break;
942 case CTRL_APP1:
943 port = PORT_APP1;
944 enable_ier = APP1_DL;
945 break;
946 case CTRL_APP2:
947 port = PORT_APP2;
948 enable_ier = APP2_DL;
949 if (dc->state == NOZOMI_STATE_ALLOCATED) {
950 /*
951 * After card initialization the flow control
952 * received for APP2 is always the last
953 */
954 dc->state = NOZOMI_STATE_READY;
955 dev_info(&dc->pdev->dev, "Device READY!\n");
956 }
957 break;
958 default:
959 dev_err(&dc->pdev->dev,
960 "ERROR: flow control received for non-existing port\n");
961 return 0;
962 }
963
964 DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
965 *((u16 *)&ctrl_dl));
966
967 old_ctrl = dc->port[port].ctrl_dl;
968 dc->port[port].ctrl_dl = ctrl_dl;
969
970 if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
971 DBG1("Disable interrupt (0x%04X) on port: %d",
972 enable_ier, port);
973 disable_transmit_ul(port, dc);
974
975 } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
976
977 if (kfifo_len(&dc->port[port].fifo_ul)) {
978 DBG1("Enable interrupt (0x%04X) on port: %d",
979 enable_ier, port);
980 DBG1("Data in buffer [%d], enable transmit! ",
981 kfifo_len(&dc->port[port].fifo_ul));
982 enable_transmit_ul(port, dc);
983 } else {
984 DBG1("No data in buffer...");
985 }
986 }
987
988 if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
989 DBG1(" No change in mctrl");
990 return 1;
991 }
992 /* Update statistics */
993 if (old_ctrl.CTS != ctrl_dl.CTS)
994 dc->port[port].tty_icount.cts++;
995 if (old_ctrl.DSR != ctrl_dl.DSR)
996 dc->port[port].tty_icount.dsr++;
997 if (old_ctrl.RI != ctrl_dl.RI)
998 dc->port[port].tty_icount.rng++;
999 if (old_ctrl.DCD != ctrl_dl.DCD)
1000 dc->port[port].tty_icount.dcd++;
1001
1002 wake_up_interruptible(&dc->port[port].tty_wait);
1003
1004 DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1005 port,
1006 dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1007 dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1008
1009 return 1;
1010 }
1011
1012 static enum ctrl_port_type port2ctrl(enum port_type port,
1013 const struct nozomi *dc)
1014 {
1015 switch (port) {
1016 case PORT_MDM:
1017 return CTRL_MDM;
1018 case PORT_DIAG:
1019 return CTRL_DIAG;
1020 case PORT_APP1:
1021 return CTRL_APP1;
1022 case PORT_APP2:
1023 return CTRL_APP2;
1024 default:
1025 dev_err(&dc->pdev->dev,
1026 "ERROR: send flow control " \
1027 "received for non-existing port\n");
1028 }
1029 return CTRL_ERROR;
1030 }
1031
1032 /*
1033 * Send flow control, can only update one channel at a time
1034 * Return 0 - If we have updated all flow control
1035 * Return 1 - If we need to update more flow control, ack current enable more
1036 */
1037 static int send_flow_control(struct nozomi *dc)
1038 {
1039 u32 i, more_flow_control_to_be_updated = 0;
1040 u16 *ctrl;
1041
1042 for (i = PORT_MDM; i < MAX_PORT; i++) {
1043 if (dc->port[i].update_flow_control) {
1044 if (more_flow_control_to_be_updated) {
1045 /* We have more flow control to be updated */
1046 return 1;
1047 }
1048 dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1049 ctrl = (u16 *)&dc->port[i].ctrl_ul;
1050 write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1051 (u32 *) ctrl, 2);
1052 dc->port[i].update_flow_control = 0;
1053 more_flow_control_to_be_updated = 1;
1054 }
1055 }
1056 return 0;
1057 }
1058
1059 /*
1060 * Handle downlink data, ports that are handled are modem and diagnostics
1061 * Return 1 - ok
1062 * Return 0 - toggle fields are out of sync
1063 */
1064 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1065 u16 read_iir, u16 mask1, u16 mask2)
1066 {
1067 if (*toggle == 0 && read_iir & mask1) {
1068 if (receive_data(port, dc)) {
1069 writew(mask1, dc->reg_fcr);
1070 *toggle = !(*toggle);
1071 }
1072
1073 if (read_iir & mask2) {
1074 if (receive_data(port, dc)) {
1075 writew(mask2, dc->reg_fcr);
1076 *toggle = !(*toggle);
1077 }
1078 }
1079 } else if (*toggle == 1 && read_iir & mask2) {
1080 if (receive_data(port, dc)) {
1081 writew(mask2, dc->reg_fcr);
1082 *toggle = !(*toggle);
1083 }
1084
1085 if (read_iir & mask1) {
1086 if (receive_data(port, dc)) {
1087 writew(mask1, dc->reg_fcr);
1088 *toggle = !(*toggle);
1089 }
1090 }
1091 } else {
1092 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1093 *toggle);
1094 return 0;
1095 }
1096 return 1;
1097 }
1098
1099 /*
1100 * Handle uplink data, this is currently for the modem port
1101 * Return 1 - ok
1102 * Return 0 - toggle field are out of sync
1103 */
1104 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1105 {
1106 u8 *toggle = &(dc->port[port].toggle_ul);
1107
1108 if (*toggle == 0 && read_iir & MDM_UL1) {
1109 dc->last_ier &= ~MDM_UL;
1110 writew(dc->last_ier, dc->reg_ier);
1111 if (send_data(port, dc)) {
1112 writew(MDM_UL1, dc->reg_fcr);
1113 dc->last_ier = dc->last_ier | MDM_UL;
1114 writew(dc->last_ier, dc->reg_ier);
1115 *toggle = !*toggle;
1116 }
1117
1118 if (read_iir & MDM_UL2) {
1119 dc->last_ier &= ~MDM_UL;
1120 writew(dc->last_ier, dc->reg_ier);
1121 if (send_data(port, dc)) {
1122 writew(MDM_UL2, dc->reg_fcr);
1123 dc->last_ier = dc->last_ier | MDM_UL;
1124 writew(dc->last_ier, dc->reg_ier);
1125 *toggle = !*toggle;
1126 }
1127 }
1128
1129 } else if (*toggle == 1 && read_iir & MDM_UL2) {
1130 dc->last_ier &= ~MDM_UL;
1131 writew(dc->last_ier, dc->reg_ier);
1132 if (send_data(port, dc)) {
1133 writew(MDM_UL2, dc->reg_fcr);
1134 dc->last_ier = dc->last_ier | MDM_UL;
1135 writew(dc->last_ier, dc->reg_ier);
1136 *toggle = !*toggle;
1137 }
1138
1139 if (read_iir & MDM_UL1) {
1140 dc->last_ier &= ~MDM_UL;
1141 writew(dc->last_ier, dc->reg_ier);
1142 if (send_data(port, dc)) {
1143 writew(MDM_UL1, dc->reg_fcr);
1144 dc->last_ier = dc->last_ier | MDM_UL;
1145 writew(dc->last_ier, dc->reg_ier);
1146 *toggle = !*toggle;
1147 }
1148 }
1149 } else {
1150 writew(read_iir & MDM_UL, dc->reg_fcr);
1151 dev_err(&dc->pdev->dev, "port out of sync!\n");
1152 return 0;
1153 }
1154 return 1;
1155 }
1156
1157 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1158 {
1159 struct nozomi *dc = dev_id;
1160 unsigned int a;
1161 u16 read_iir;
1162
1163 if (!dc)
1164 return IRQ_NONE;
1165
1166 spin_lock(&dc->spin_mutex);
1167 read_iir = readw(dc->reg_iir);
1168
1169 /* Card removed */
1170 if (read_iir == (u16)-1)
1171 goto none;
1172 /*
1173 * Just handle interrupt enabled in IER
1174 * (by masking with dc->last_ier)
1175 */
1176 read_iir &= dc->last_ier;
1177
1178 if (read_iir == 0)
1179 goto none;
1180
1181
1182 DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1183 dc->last_ier);
1184
1185 if (read_iir & RESET) {
1186 if (unlikely(!nozomi_read_config_table(dc))) {
1187 dc->last_ier = 0x0;
1188 writew(dc->last_ier, dc->reg_ier);
1189 dev_err(&dc->pdev->dev, "Could not read status from "
1190 "card, we should disable interface\n");
1191 } else {
1192 writew(RESET, dc->reg_fcr);
1193 }
1194 /* No more useful info if this was the reset interrupt. */
1195 goto exit_handler;
1196 }
1197 if (read_iir & CTRL_UL) {
1198 DBG1("CTRL_UL");
1199 dc->last_ier &= ~CTRL_UL;
1200 writew(dc->last_ier, dc->reg_ier);
1201 if (send_flow_control(dc)) {
1202 writew(CTRL_UL, dc->reg_fcr);
1203 dc->last_ier = dc->last_ier | CTRL_UL;
1204 writew(dc->last_ier, dc->reg_ier);
1205 }
1206 }
1207 if (read_iir & CTRL_DL) {
1208 receive_flow_control(dc);
1209 writew(CTRL_DL, dc->reg_fcr);
1210 }
1211 if (read_iir & MDM_DL) {
1212 if (!handle_data_dl(dc, PORT_MDM,
1213 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1214 MDM_DL1, MDM_DL2)) {
1215 dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1216 goto exit_handler;
1217 }
1218 }
1219 if (read_iir & MDM_UL) {
1220 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1221 dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1222 goto exit_handler;
1223 }
1224 }
1225 if (read_iir & DIAG_DL) {
1226 if (!handle_data_dl(dc, PORT_DIAG,
1227 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1228 DIAG_DL1, DIAG_DL2)) {
1229 dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1230 goto exit_handler;
1231 }
1232 }
1233 if (read_iir & DIAG_UL) {
1234 dc->last_ier &= ~DIAG_UL;
1235 writew(dc->last_ier, dc->reg_ier);
1236 if (send_data(PORT_DIAG, dc)) {
1237 writew(DIAG_UL, dc->reg_fcr);
1238 dc->last_ier = dc->last_ier | DIAG_UL;
1239 writew(dc->last_ier, dc->reg_ier);
1240 }
1241 }
1242 if (read_iir & APP1_DL) {
1243 if (receive_data(PORT_APP1, dc))
1244 writew(APP1_DL, dc->reg_fcr);
1245 }
1246 if (read_iir & APP1_UL) {
1247 dc->last_ier &= ~APP1_UL;
1248 writew(dc->last_ier, dc->reg_ier);
1249 if (send_data(PORT_APP1, dc)) {
1250 writew(APP1_UL, dc->reg_fcr);
1251 dc->last_ier = dc->last_ier | APP1_UL;
1252 writew(dc->last_ier, dc->reg_ier);
1253 }
1254 }
1255 if (read_iir & APP2_DL) {
1256 if (receive_data(PORT_APP2, dc))
1257 writew(APP2_DL, dc->reg_fcr);
1258 }
1259 if (read_iir & APP2_UL) {
1260 dc->last_ier &= ~APP2_UL;
1261 writew(dc->last_ier, dc->reg_ier);
1262 if (send_data(PORT_APP2, dc)) {
1263 writew(APP2_UL, dc->reg_fcr);
1264 dc->last_ier = dc->last_ier | APP2_UL;
1265 writew(dc->last_ier, dc->reg_ier);
1266 }
1267 }
1268
1269 exit_handler:
1270 spin_unlock(&dc->spin_mutex);
1271
1272 for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1273 if (test_and_clear_bit(a, &dc->flip))
1274 tty_flip_buffer_push(&dc->port[a].port);
1275
1276 return IRQ_HANDLED;
1277 none:
1278 spin_unlock(&dc->spin_mutex);
1279 return IRQ_NONE;
1280 }
1281
1282 static void nozomi_get_card_type(struct nozomi *dc)
1283 {
1284 int i;
1285 u32 size = 0;
1286
1287 for (i = 0; i < 6; i++)
1288 size += pci_resource_len(dc->pdev, i);
1289
1290 /* Assume card type F32_8 if no match */
1291 dc->card_type = size == 2048 ? F32_2 : F32_8;
1292
1293 dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1294 }
1295
1296 static void nozomi_setup_private_data(struct nozomi *dc)
1297 {
1298 void __iomem *offset = dc->base_addr + dc->card_type / 2;
1299 unsigned int i;
1300
1301 dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1302 dc->reg_iir = (void __iomem *)(offset + R_IIR);
1303 dc->reg_ier = (void __iomem *)(offset + R_IER);
1304 dc->last_ier = 0;
1305 dc->flip = 0;
1306
1307 dc->port[PORT_MDM].token_dl = MDM_DL;
1308 dc->port[PORT_DIAG].token_dl = DIAG_DL;
1309 dc->port[PORT_APP1].token_dl = APP1_DL;
1310 dc->port[PORT_APP2].token_dl = APP2_DL;
1311
1312 for (i = 0; i < MAX_PORT; i++)
1313 init_waitqueue_head(&dc->port[i].tty_wait);
1314 }
1315
1316 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1317 char *buf)
1318 {
1319 const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1320
1321 return sprintf(buf, "%d\n", dc->card_type);
1322 }
1323 static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
1324
1325 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1326 char *buf)
1327 {
1328 const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1329
1330 return sprintf(buf, "%u\n", dc->open_ttys);
1331 }
1332 static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
1333
1334 static void make_sysfs_files(struct nozomi *dc)
1335 {
1336 if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1337 dev_err(&dc->pdev->dev,
1338 "Could not create sysfs file for card_type\n");
1339 if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1340 dev_err(&dc->pdev->dev,
1341 "Could not create sysfs file for open_ttys\n");
1342 }
1343
1344 static void remove_sysfs_files(struct nozomi *dc)
1345 {
1346 device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1347 device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1348 }
1349
1350 /* Allocate memory for one device */
1351 static int nozomi_card_init(struct pci_dev *pdev,
1352 const struct pci_device_id *ent)
1353 {
1354 resource_size_t start;
1355 int ret;
1356 struct nozomi *dc = NULL;
1357 int ndev_idx;
1358 int i;
1359
1360 dev_dbg(&pdev->dev, "Init, new card found\n");
1361
1362 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1363 if (!ndevs[ndev_idx])
1364 break;
1365
1366 if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1367 dev_err(&pdev->dev, "no free tty range for this card left\n");
1368 ret = -EIO;
1369 goto err;
1370 }
1371
1372 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1373 if (unlikely(!dc)) {
1374 dev_err(&pdev->dev, "Could not allocate memory\n");
1375 ret = -ENOMEM;
1376 goto err_free;
1377 }
1378
1379 dc->pdev = pdev;
1380
1381 ret = pci_enable_device(dc->pdev);
1382 if (ret) {
1383 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1384 goto err_free;
1385 }
1386
1387 ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1388 if (ret) {
1389 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1390 (int) /* nozomi_private.io_addr */ 0);
1391 goto err_disable_device;
1392 }
1393
1394 start = pci_resource_start(dc->pdev, 0);
1395 if (start == 0) {
1396 dev_err(&pdev->dev, "No I/O address for card detected\n");
1397 ret = -ENODEV;
1398 goto err_rel_regs;
1399 }
1400
1401 /* Find out what card type it is */
1402 nozomi_get_card_type(dc);
1403
1404 dc->base_addr = ioremap_nocache(start, dc->card_type);
1405 if (!dc->base_addr) {
1406 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1407 ret = -ENODEV;
1408 goto err_rel_regs;
1409 }
1410
1411 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1412 if (!dc->send_buf) {
1413 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1414 ret = -ENOMEM;
1415 goto err_free_sbuf;
1416 }
1417
1418 for (i = PORT_MDM; i < MAX_PORT; i++) {
1419 if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1420 GFP_KERNEL)) {
1421 dev_err(&pdev->dev,
1422 "Could not allocate kfifo buffer\n");
1423 ret = -ENOMEM;
1424 goto err_free_kfifo;
1425 }
1426 }
1427
1428 spin_lock_init(&dc->spin_mutex);
1429
1430 nozomi_setup_private_data(dc);
1431
1432 /* Disable all interrupts */
1433 dc->last_ier = 0;
1434 writew(dc->last_ier, dc->reg_ier);
1435
1436 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1437 NOZOMI_NAME, dc);
1438 if (unlikely(ret)) {
1439 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1440 goto err_free_kfifo;
1441 }
1442
1443 DBG1("base_addr: %p", dc->base_addr);
1444
1445 make_sysfs_files(dc);
1446
1447 dc->index_start = ndev_idx * MAX_PORT;
1448 ndevs[ndev_idx] = dc;
1449
1450 pci_set_drvdata(pdev, dc);
1451
1452 /* Enable RESET interrupt */
1453 dc->last_ier = RESET;
1454 iowrite16(dc->last_ier, dc->reg_ier);
1455
1456 dc->state = NOZOMI_STATE_ENABLED;
1457
1458 for (i = 0; i < MAX_PORT; i++) {
1459 struct device *tty_dev;
1460 struct port *port = &dc->port[i];
1461 port->dc = dc;
1462 tty_port_init(&port->port);
1463 port->port.ops = &noz_tty_port_ops;
1464 tty_dev = tty_port_register_device(&port->port, ntty_driver,
1465 dc->index_start + i, &pdev->dev);
1466
1467 if (IS_ERR(tty_dev)) {
1468 ret = PTR_ERR(tty_dev);
1469 dev_err(&pdev->dev, "Could not allocate tty?\n");
1470 tty_port_destroy(&port->port);
1471 goto err_free_tty;
1472 }
1473 }
1474
1475 return 0;
1476
1477 err_free_tty:
1478 for (i = 0; i < MAX_PORT; ++i) {
1479 tty_unregister_device(ntty_driver, dc->index_start + i);
1480 tty_port_destroy(&dc->port[i].port);
1481 }
1482 err_free_kfifo:
1483 for (i = 0; i < MAX_PORT; i++)
1484 kfifo_free(&dc->port[i].fifo_ul);
1485 err_free_sbuf:
1486 kfree(dc->send_buf);
1487 iounmap(dc->base_addr);
1488 err_rel_regs:
1489 pci_release_regions(pdev);
1490 err_disable_device:
1491 pci_disable_device(pdev);
1492 err_free:
1493 kfree(dc);
1494 err:
1495 return ret;
1496 }
1497
1498 static void tty_exit(struct nozomi *dc)
1499 {
1500 unsigned int i;
1501
1502 DBG1(" ");
1503
1504 for (i = 0; i < MAX_PORT; ++i)
1505 tty_port_tty_hangup(&dc->port[i].port, false);
1506
1507 /* Racy below - surely should wait for scheduled work to be done or
1508 complete off a hangup method ? */
1509 while (dc->open_ttys)
1510 msleep(1);
1511 for (i = 0; i < MAX_PORT; ++i) {
1512 tty_unregister_device(ntty_driver, dc->index_start + i);
1513 tty_port_destroy(&dc->port[i].port);
1514 }
1515 }
1516
1517 /* Deallocate memory for one device */
1518 static void nozomi_card_exit(struct pci_dev *pdev)
1519 {
1520 int i;
1521 struct ctrl_ul ctrl;
1522 struct nozomi *dc = pci_get_drvdata(pdev);
1523
1524 /* Disable all interrupts */
1525 dc->last_ier = 0;
1526 writew(dc->last_ier, dc->reg_ier);
1527
1528 tty_exit(dc);
1529
1530 /* Send 0x0001, command card to resend the reset token. */
1531 /* This is to get the reset when the module is reloaded. */
1532 ctrl.port = 0x00;
1533 ctrl.reserved = 0;
1534 ctrl.RTS = 0;
1535 ctrl.DTR = 1;
1536 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1537
1538 /* Setup dc->reg addresses to we can use defines here */
1539 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1540 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
1541
1542 remove_sysfs_files(dc);
1543
1544 free_irq(pdev->irq, dc);
1545
1546 for (i = 0; i < MAX_PORT; i++)
1547 kfifo_free(&dc->port[i].fifo_ul);
1548
1549 kfree(dc->send_buf);
1550
1551 iounmap(dc->base_addr);
1552
1553 pci_release_regions(pdev);
1554
1555 pci_disable_device(pdev);
1556
1557 ndevs[dc->index_start / MAX_PORT] = NULL;
1558
1559 kfree(dc);
1560 }
1561
1562 static void set_rts(const struct tty_struct *tty, int rts)
1563 {
1564 struct port *port = get_port_by_tty(tty);
1565
1566 port->ctrl_ul.RTS = rts;
1567 port->update_flow_control = 1;
1568 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1569 }
1570
1571 static void set_dtr(const struct tty_struct *tty, int dtr)
1572 {
1573 struct port *port = get_port_by_tty(tty);
1574
1575 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1576
1577 port->ctrl_ul.DTR = dtr;
1578 port->update_flow_control = 1;
1579 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1580 }
1581
1582 /*
1583 * ----------------------------------------------------------------------------
1584 * TTY code
1585 * ----------------------------------------------------------------------------
1586 */
1587
1588 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1589 {
1590 struct port *port = get_port_by_tty(tty);
1591 struct nozomi *dc = get_dc_by_tty(tty);
1592 int ret;
1593 if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1594 return -ENODEV;
1595 ret = tty_standard_install(driver, tty);
1596 if (ret == 0)
1597 tty->driver_data = port;
1598 return ret;
1599 }
1600
1601 static void ntty_cleanup(struct tty_struct *tty)
1602 {
1603 tty->driver_data = NULL;
1604 }
1605
1606 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1607 {
1608 struct port *port = container_of(tport, struct port, port);
1609 struct nozomi *dc = port->dc;
1610 unsigned long flags;
1611
1612 DBG1("open: %d", port->token_dl);
1613 spin_lock_irqsave(&dc->spin_mutex, flags);
1614 dc->last_ier = dc->last_ier | port->token_dl;
1615 writew(dc->last_ier, dc->reg_ier);
1616 dc->open_ttys++;
1617 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1618 printk("noz: activated %d: %p\n", tty->index, tport);
1619 return 0;
1620 }
1621
1622 static int ntty_open(struct tty_struct *tty, struct file *filp)
1623 {
1624 struct port *port = tty->driver_data;
1625 return tty_port_open(&port->port, tty, filp);
1626 }
1627
1628 static void ntty_shutdown(struct tty_port *tport)
1629 {
1630 struct port *port = container_of(tport, struct port, port);
1631 struct nozomi *dc = port->dc;
1632 unsigned long flags;
1633
1634 DBG1("close: %d", port->token_dl);
1635 spin_lock_irqsave(&dc->spin_mutex, flags);
1636 dc->last_ier &= ~(port->token_dl);
1637 writew(dc->last_ier, dc->reg_ier);
1638 dc->open_ttys--;
1639 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1640 printk("noz: shutdown %p\n", tport);
1641 }
1642
1643 static void ntty_close(struct tty_struct *tty, struct file *filp)
1644 {
1645 struct port *port = tty->driver_data;
1646 if (port)
1647 tty_port_close(&port->port, tty, filp);
1648 }
1649
1650 static void ntty_hangup(struct tty_struct *tty)
1651 {
1652 struct port *port = tty->driver_data;
1653 tty_port_hangup(&port->port);
1654 }
1655
1656 /*
1657 * called when the userspace process writes to the tty (/dev/noz*).
1658 * Data is inserted into a fifo, which is then read and transferred to the modem.
1659 */
1660 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1661 int count)
1662 {
1663 int rval = -EINVAL;
1664 struct nozomi *dc = get_dc_by_tty(tty);
1665 struct port *port = tty->driver_data;
1666 unsigned long flags;
1667
1668 /* DBG1( "WRITEx: %d, index = %d", count, index); */
1669
1670 if (!dc || !port)
1671 return -ENODEV;
1672
1673 rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1674
1675 spin_lock_irqsave(&dc->spin_mutex, flags);
1676 /* CTS is only valid on the modem channel */
1677 if (port == &(dc->port[PORT_MDM])) {
1678 if (port->ctrl_dl.CTS) {
1679 DBG4("Enable interrupt");
1680 enable_transmit_ul(tty->index % MAX_PORT, dc);
1681 } else {
1682 dev_err(&dc->pdev->dev,
1683 "CTS not active on modem port?\n");
1684 }
1685 } else {
1686 enable_transmit_ul(tty->index % MAX_PORT, dc);
1687 }
1688 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1689
1690 return rval;
1691 }
1692
1693 /*
1694 * Calculate how much is left in device
1695 * This method is called by the upper tty layer.
1696 * #according to sources N_TTY.c it expects a value >= 0 and
1697 * does not check for negative values.
1698 *
1699 * If the port is unplugged report lots of room and let the bits
1700 * dribble away so we don't block anything.
1701 */
1702 static int ntty_write_room(struct tty_struct *tty)
1703 {
1704 struct port *port = tty->driver_data;
1705 int room = 4096;
1706 const struct nozomi *dc = get_dc_by_tty(tty);
1707
1708 if (dc)
1709 room = kfifo_avail(&port->fifo_ul);
1710
1711 return room;
1712 }
1713
1714 /* Gets io control parameters */
1715 static int ntty_tiocmget(struct tty_struct *tty)
1716 {
1717 const struct port *port = tty->driver_data;
1718 const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1719 const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1720
1721 /* Note: these could change under us but it is not clear this
1722 matters if so */
1723 return (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1724 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1725 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1726 (ctrl_dl->RI ? TIOCM_RNG : 0) |
1727 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1728 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1729 }
1730
1731 /* Sets io controls parameters */
1732 static int ntty_tiocmset(struct tty_struct *tty,
1733 unsigned int set, unsigned int clear)
1734 {
1735 struct nozomi *dc = get_dc_by_tty(tty);
1736 unsigned long flags;
1737
1738 spin_lock_irqsave(&dc->spin_mutex, flags);
1739 if (set & TIOCM_RTS)
1740 set_rts(tty, 1);
1741 else if (clear & TIOCM_RTS)
1742 set_rts(tty, 0);
1743
1744 if (set & TIOCM_DTR)
1745 set_dtr(tty, 1);
1746 else if (clear & TIOCM_DTR)
1747 set_dtr(tty, 0);
1748 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1749
1750 return 0;
1751 }
1752
1753 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1754 struct async_icount *cprev)
1755 {
1756 const struct async_icount cnow = port->tty_icount;
1757 int ret;
1758
1759 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1760 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1761 ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1762 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1763
1764 *cprev = cnow;
1765
1766 return ret;
1767 }
1768
1769 static int ntty_tiocgicount(struct tty_struct *tty,
1770 struct serial_icounter_struct *icount)
1771 {
1772 struct port *port = tty->driver_data;
1773 const struct async_icount cnow = port->tty_icount;
1774
1775 icount->cts = cnow.cts;
1776 icount->dsr = cnow.dsr;
1777 icount->rng = cnow.rng;
1778 icount->dcd = cnow.dcd;
1779 icount->rx = cnow.rx;
1780 icount->tx = cnow.tx;
1781 icount->frame = cnow.frame;
1782 icount->overrun = cnow.overrun;
1783 icount->parity = cnow.parity;
1784 icount->brk = cnow.brk;
1785 icount->buf_overrun = cnow.buf_overrun;
1786 return 0;
1787 }
1788
1789 static int ntty_ioctl(struct tty_struct *tty,
1790 unsigned int cmd, unsigned long arg)
1791 {
1792 struct port *port = tty->driver_data;
1793 int rval = -ENOIOCTLCMD;
1794
1795 DBG1("******** IOCTL, cmd: %d", cmd);
1796
1797 switch (cmd) {
1798 case TIOCMIWAIT: {
1799 struct async_icount cprev = port->tty_icount;
1800
1801 rval = wait_event_interruptible(port->tty_wait,
1802 ntty_cflags_changed(port, arg, &cprev));
1803 break;
1804 }
1805 default:
1806 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1807 break;
1808 }
1809
1810 return rval;
1811 }
1812
1813 /*
1814 * Called by the upper tty layer when tty buffers are ready
1815 * to receive data again after a call to throttle.
1816 */
1817 static void ntty_unthrottle(struct tty_struct *tty)
1818 {
1819 struct nozomi *dc = get_dc_by_tty(tty);
1820 unsigned long flags;
1821
1822 DBG1("UNTHROTTLE");
1823 spin_lock_irqsave(&dc->spin_mutex, flags);
1824 enable_transmit_dl(tty->index % MAX_PORT, dc);
1825 set_rts(tty, 1);
1826
1827 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1828 }
1829
1830 /*
1831 * Called by the upper tty layer when the tty buffers are almost full.
1832 * The driver should stop send more data.
1833 */
1834 static void ntty_throttle(struct tty_struct *tty)
1835 {
1836 struct nozomi *dc = get_dc_by_tty(tty);
1837 unsigned long flags;
1838
1839 DBG1("THROTTLE");
1840 spin_lock_irqsave(&dc->spin_mutex, flags);
1841 set_rts(tty, 0);
1842 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1843 }
1844
1845 /* Returns number of chars in buffer, called by tty layer */
1846 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1847 {
1848 struct port *port = tty->driver_data;
1849 struct nozomi *dc = get_dc_by_tty(tty);
1850 s32 rval = 0;
1851
1852 if (unlikely(!dc || !port)) {
1853 goto exit_in_buffer;
1854 }
1855
1856 rval = kfifo_len(&port->fifo_ul);
1857
1858 exit_in_buffer:
1859 return rval;
1860 }
1861
1862 static const struct tty_port_operations noz_tty_port_ops = {
1863 .activate = ntty_activate,
1864 .shutdown = ntty_shutdown,
1865 };
1866
1867 static const struct tty_operations tty_ops = {
1868 .ioctl = ntty_ioctl,
1869 .open = ntty_open,
1870 .close = ntty_close,
1871 .hangup = ntty_hangup,
1872 .write = ntty_write,
1873 .write_room = ntty_write_room,
1874 .unthrottle = ntty_unthrottle,
1875 .throttle = ntty_throttle,
1876 .chars_in_buffer = ntty_chars_in_buffer,
1877 .tiocmget = ntty_tiocmget,
1878 .tiocmset = ntty_tiocmset,
1879 .get_icount = ntty_tiocgicount,
1880 .install = ntty_install,
1881 .cleanup = ntty_cleanup,
1882 };
1883
1884 /* Module initialization */
1885 static struct pci_driver nozomi_driver = {
1886 .name = NOZOMI_NAME,
1887 .id_table = nozomi_pci_tbl,
1888 .probe = nozomi_card_init,
1889 .remove = nozomi_card_exit,
1890 };
1891
1892 static __init int nozomi_init(void)
1893 {
1894 int ret;
1895
1896 printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1897
1898 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1899 if (!ntty_driver)
1900 return -ENOMEM;
1901
1902 ntty_driver->driver_name = NOZOMI_NAME_TTY;
1903 ntty_driver->name = "noz";
1904 ntty_driver->major = 0;
1905 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1906 ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1907 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1908 ntty_driver->init_termios = tty_std_termios;
1909 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1910 HUPCL | CLOCAL;
1911 ntty_driver->init_termios.c_ispeed = 115200;
1912 ntty_driver->init_termios.c_ospeed = 115200;
1913 tty_set_operations(ntty_driver, &tty_ops);
1914
1915 ret = tty_register_driver(ntty_driver);
1916 if (ret) {
1917 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1918 goto free_tty;
1919 }
1920
1921 ret = pci_register_driver(&nozomi_driver);
1922 if (ret) {
1923 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1924 goto unr_tty;
1925 }
1926
1927 return 0;
1928 unr_tty:
1929 tty_unregister_driver(ntty_driver);
1930 free_tty:
1931 put_tty_driver(ntty_driver);
1932 return ret;
1933 }
1934
1935 static __exit void nozomi_exit(void)
1936 {
1937 printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1938 pci_unregister_driver(&nozomi_driver);
1939 tty_unregister_driver(ntty_driver);
1940 put_tty_driver(ntty_driver);
1941 }
1942
1943 module_init(nozomi_init);
1944 module_exit(nozomi_exit);
1945
1946 module_param(debug, int, S_IRUGO | S_IWUSR);
1947
1948 MODULE_LICENSE("Dual BSD/GPL");
1949 MODULE_DESCRIPTION(DRIVER_DESC);
Linux with added FPC-III support