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[net-next-2.6.git] / drivers / char / nozomi.c
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20fd1e3b
FS		 1/*
2 * nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
3 *
4 * Written by: Ulf Jakobsson,
5 * Jan �erfeldt,
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/*
42 * CHANGELOG
43 * Version 2.1d
44 * 11-November-2007 Jiri Slaby, Frank Seidel
45 * - Big rework of multicard support by Jiri
46 * - Major cleanups (semaphore to mutex, endianess, no major reservation)
47 * - Optimizations
48 *
49 * Version 2.1c
50 * 30-October-2007 Frank Seidel
51 * - Completed multicard support
52 * - Minor cleanups
53 *
54 * Version 2.1b
55 * 07-August-2007 Frank Seidel
56 * - Minor cleanups
57 * - theoretical multicard support
58 *
59 * Version 2.1
60 * 03-July-2006 Paul Hardwick
61 *
62 * - Stability Improvements. Incorporated spinlock wraps patch.
63 * - Updated for newer 2.6.14+ kernels (tty_buffer_request_room)
64 * - using __devexit macro for tty
65 *
66 *
67 * Version 2.0
68 * 08-feb-2006 15:34:10:Ulf
69 *
70 * -Fixed issue when not waking up line disipine layer, could probably result
71 * in better uplink performance for 2.4.
72 *
73 * -Fixed issue with big endian during initalization, now proper toggle flags
74 * are handled between preloader and maincode.
75 *
76 * -Fixed flow control issue.
77 *
78 * -Added support for setting DTR.
79 *
80 * -For 2.4 kernels, removing temporary buffer that's not needed.
81 *
82 * -Reading CTS only for modem port (only port that supports it).
83 *
84 * -Return 0 in write_room instead of netative value, it's not handled in
85 * upper layer.
86 *
87 * --------------------------------------------------------------------------
88 * Version 1.0
89 *
90 * First version of driver, only tested with card of type F32_2.
91 * Works fine with 2.4 and 2.6 kernels.
92 * Driver also support big endian architecture.
93 */
94
95/* Enable this to have a lot of debug printouts */
96#define DEBUG
97
98#include <linux/kernel.h>
99#include <linux/module.h>
100#include <linux/pci.h>
101#include <linux/ioport.h>
102#include <linux/tty.h>
103#include <linux/tty_driver.h>
104#include <linux/tty_flip.h>
105#include <linux/serial.h>
106#include <linux/interrupt.h>
107#include <linux/kmod.h>
108#include <linux/init.h>
109#include <linux/kfifo.h>
110#include <linux/uaccess.h>
111#include <asm/byteorder.h>
112
113#include <linux/delay.h>
114
115
116#define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
117 __DATE__ " " __TIME__ ")"
118
119/* Macros definitions */
120
121/* Default debug printout level */
122#define NOZOMI_DEBUG_LEVEL 0x00
123
124#define P_BUF_SIZE 128
125#define NFO(_err_flag_, args...) \
126do { \
127 char tmp[P_BUF_SIZE]; \
128 snprintf(tmp, sizeof(tmp), ##args); \
129 printk(_err_flag_ "[%d] %s(): %s\n", __LINE__, \
130 __FUNCTION__, tmp); \
131} while (0)
132
133#define DBG1(args...) D_(0x01, ##args)
134#define DBG2(args...) D_(0x02, ##args)
135#define DBG3(args...) D_(0x04, ##args)
136#define DBG4(args...) D_(0x08, ##args)
137#define DBG5(args...) D_(0x10, ##args)
138#define DBG6(args...) D_(0x20, ##args)
139#define DBG7(args...) D_(0x40, ##args)
140#define DBG8(args...) D_(0x80, ##args)
141
142#ifdef DEBUG
143/* Do we need this settable at runtime? */
144static int debug = NOZOMI_DEBUG_LEVEL;
145
146#define D(lvl, args...) do {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
147 while (0)
148#define D_(lvl, args...) D(lvl, ##args)
149
150/* These printouts are always printed */
151
152#else
153static int debug;
154#define D_(lvl, args...)
155#endif
156
157/* TODO: rewrite to optimize macros... */
158
159#define TMP_BUF_MAX 256
160
161#define DUMP(buf__,len__) \
162 do { \
163 char tbuf[TMP_BUF_MAX] = {0};\
164 if (len__ > 1) {\
165 snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
166 if (tbuf[len__-2] == '\r') {\
167 tbuf[len__-2] = 'r';\
168 } \
169 DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
170 } else {\
171 DBG1("SENDING: '%s' (%d)", tbuf, len__);\
172 } \
173} while (0)
174
175/* Defines */
176#define NOZOMI_NAME "nozomi"
177#define NOZOMI_NAME_TTY "nozomi_tty"
178#define DRIVER_DESC "Nozomi driver"
179
180#define NTTY_TTY_MAXMINORS 256
181#define NTTY_FIFO_BUFFER_SIZE 8192
182
183/* Must be power of 2 */
184#define FIFO_BUFFER_SIZE_UL 8192
185
186/* Size of tmp send buffer to card */
187#define SEND_BUF_MAX 1024
188#define RECEIVE_BUF_MAX 4
189
190
191/* Define all types of vendors and devices to support */
192#define VENDOR1 0x1931 /* Vendor Option */
193#define DEVICE1 0x000c /* HSDPA card */
194
195#define R_IIR 0x0000 /* Interrupt Identity Register */
196#define R_FCR 0x0000 /* Flow Control Register */
197#define R_IER 0x0004 /* Interrupt Enable Register */
198
199#define CONFIG_MAGIC 0xEFEFFEFE
200#define TOGGLE_VALID 0x0000
201
202/* Definition of interrupt tokens */
203#define MDM_DL1 0x0001
204#define MDM_UL1 0x0002
205#define MDM_DL2 0x0004
206#define MDM_UL2 0x0008
207#define DIAG_DL1 0x0010
208#define DIAG_DL2 0x0020
209#define DIAG_UL 0x0040
210#define APP1_DL 0x0080
211#define APP1_UL 0x0100
212#define APP2_DL 0x0200
213#define APP2_UL 0x0400
214#define CTRL_DL 0x0800
215#define CTRL_UL 0x1000
216#define RESET 0x8000
217
218#define MDM_DL (MDM_DL1 | MDM_DL2)
219#define MDM_UL (MDM_UL1 | MDM_UL2)
220#define DIAG_DL (DIAG_DL1 | DIAG_DL2)
221
222/* modem signal definition */
223#define CTRL_DSR 0x0001
224#define CTRL_DCD 0x0002
225#define CTRL_RI 0x0004
226#define CTRL_CTS 0x0008
227
228#define CTRL_DTR 0x0001
229#define CTRL_RTS 0x0002
230
231#define MAX_PORT 4
232#define NOZOMI_MAX_PORTS 5
233#define NOZOMI_MAX_CARDS (NTTY_TTY_MAXMINORS / MAX_PORT)
234
235/* Type definitions */
236
237/*
238 * There are two types of nozomi cards,
239 * one with 2048 memory and with 8192 memory
240 */
241enum card_type {
242 F32_2 = 2048, /* 512 bytes downlink + uplink * 2 -> 2048 */
243 F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
244};
245
246/* Two different toggle channels exist */
247enum channel_type {
248 CH_A = 0,
249 CH_B = 1,
250};
251
252/* Port definition for the card regarding flow control */
253enum ctrl_port_type {
254 CTRL_CMD = 0,
255 CTRL_MDM = 1,
256 CTRL_DIAG = 2,
257 CTRL_APP1 = 3,
258 CTRL_APP2 = 4,
259 CTRL_ERROR = -1,
260};
261
262/* Ports that the nozomi has */
263enum port_type {
264 PORT_MDM = 0,
265 PORT_DIAG = 1,
266 PORT_APP1 = 2,
267 PORT_APP2 = 3,
268 PORT_CTRL = 4,
269 PORT_ERROR = -1,
270};
271
272#ifdef __BIG_ENDIAN
273/* Big endian */
274
275struct toggles {
276 unsigned enabled:5; /*
277 * Toggle fields are valid if enabled is 0,
278 * else A-channels must always be used.
279 */
280 unsigned diag_dl:1;
281 unsigned mdm_dl:1;
282 unsigned mdm_ul:1;
283} __attribute__ ((packed));
284
285/* Configuration table to read at startup of card */
286/* Is for now only needed during initialization phase */
287struct config_table {
288 u32 signature;
289 u16 product_information;
290 u16 version;
291 u8 pad3[3];
292 struct toggles toggle;
293 u8 pad1[4];
294 u16 dl_mdm_len1; /*
295 * If this is 64, it can hold
296 * 60 bytes + 4 that is length field
297 */
298 u16 dl_start;
299
300 u16 dl_diag_len1;
301 u16 dl_mdm_len2; /*
302 * If this is 64, it can hold
303 * 60 bytes + 4 that is length field
304 */
305 u16 dl_app1_len;
306
307 u16 dl_diag_len2;
308 u16 dl_ctrl_len;
309 u16 dl_app2_len;
310 u8 pad2[16];
311 u16 ul_mdm_len1;
312 u16 ul_start;
313 u16 ul_diag_len;
314 u16 ul_mdm_len2;
315 u16 ul_app1_len;
316 u16 ul_app2_len;
317 u16 ul_ctrl_len;
318} __attribute__ ((packed));
319
320/* This stores all control downlink flags */
321struct ctrl_dl {
322 u8 port;
323 unsigned reserved:4;
324 unsigned CTS:1;
325 unsigned RI:1;
326 unsigned DCD:1;
327 unsigned DSR:1;
328} __attribute__ ((packed));
329
330/* This stores all control uplink flags */
331struct ctrl_ul {
332 u8 port;
333 unsigned reserved:6;
334 unsigned RTS:1;
335 unsigned DTR:1;
336} __attribute__ ((packed));
337
338#else
339/* Little endian */
340
341/* This represents the toggle information */
342struct toggles {
343 unsigned mdm_ul:1;
344 unsigned mdm_dl:1;
345 unsigned diag_dl:1;
346 unsigned enabled:5; /*
347 * Toggle fields are valid if enabled is 0,
348 * else A-channels must always be used.
349 */
350} __attribute__ ((packed));
351
352/* Configuration table to read at startup of card */
353struct config_table {
354 u32 signature;
355 u16 version;
356 u16 product_information;
357 struct toggles toggle;
358 u8 pad1[7];
359 u16 dl_start;
360 u16 dl_mdm_len1; /*
361 * If this is 64, it can hold
362 * 60 bytes + 4 that is length field
363 */
364 u16 dl_mdm_len2;
365 u16 dl_diag_len1;
366 u16 dl_diag_len2;
367 u16 dl_app1_len;
368 u16 dl_app2_len;
369 u16 dl_ctrl_len;
370 u8 pad2[16];
371 u16 ul_start;
372 u16 ul_mdm_len2;
373 u16 ul_mdm_len1;
374 u16 ul_diag_len;
375 u16 ul_app1_len;
376 u16 ul_app2_len;
377 u16 ul_ctrl_len;
378} __attribute__ ((packed));
379
380/* This stores all control downlink flags */
381struct ctrl_dl {
382 unsigned DSR:1;
383 unsigned DCD:1;
384 unsigned RI:1;
385 unsigned CTS:1;
386 unsigned reserverd:4;
387 u8 port;
388} __attribute__ ((packed));
389
390/* This stores all control uplink flags */
391struct ctrl_ul {
392 unsigned DTR:1;
393 unsigned RTS:1;
394 unsigned reserved:6;
395 u8 port;
396} __attribute__ ((packed));
397#endif
398
399/* This holds all information that is needed regarding a port */
400struct port {
401 u8 update_flow_control;
402 struct ctrl_ul ctrl_ul;
403 struct ctrl_dl ctrl_dl;
404 struct kfifo *fifo_ul;
405 void __iomem *dl_addr[2];
406 u32 dl_size[2];
407 u8 toggle_dl;
408 void __iomem *ul_addr[2];
409 u32 ul_size[2];
410 u8 toggle_ul;
411 u16 token_dl;
412
413 struct tty_struct *tty;
414 int tty_open_count;
415 /* mutex to ensure one access patch to this port */
416 struct mutex tty_sem;
417 wait_queue_head_t tty_wait;
418 struct async_icount tty_icount;
419};
420
421/* Private data one for each card in the system */
422struct nozomi {
423 void __iomem *base_addr;
424 unsigned long flip;
425
426 /* Pointers to registers */
427 void __iomem *reg_iir;
428 void __iomem *reg_fcr;
429 void __iomem *reg_ier;
430
431 u16 last_ier;
432 enum card_type card_type;
433 struct config_table config_table; /* Configuration table */
434 struct pci_dev *pdev;
435 struct port port[NOZOMI_MAX_PORTS];
436 u8 *send_buf;
437
438 spinlock_t spin_mutex; /* secures access to registers and tty */
439
440 unsigned int index_start;
441 u32 open_ttys;
442};
443
444/* This is a data packet that is read or written to/from card */
445struct buffer {
446 u32 size; /* size is the length of the data buffer */
447 u8 *data;
448} __attribute__ ((packed));
449
450/* Global variables */
451static struct pci_device_id nozomi_pci_tbl[] = {
452 {PCI_DEVICE(VENDOR1, DEVICE1)},
453 {},
454};
455
456MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
457
458static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
459static struct tty_driver *ntty_driver;
460
461/*
462 * find card by tty_index
463 */
464static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
465{
466 return tty ? ndevs[tty->index / MAX_PORT] : NULL;
467}
468
469static inline struct port *get_port_by_tty(const struct tty_struct *tty)
470{
471 struct nozomi *ndev = get_dc_by_tty(tty);
472 return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
473}
474
475/*
476 * TODO:
477 * -Optimize
478 * -Rewrite cleaner
479 */
480
481static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
482 u32 size_bytes)
483{
484 u32 i = 0;
485 const u32 *ptr = (__force u32 *) mem_addr_start;
486 u16 *buf16;
487
488 if (unlikely(!ptr || !buf))
489 goto out;
490
491 /* shortcut for extremely often used cases */
492 switch (size_bytes) {
493 case 2: /* 2 bytes */
494 buf16 = (u16 *) buf;
495 *buf16 = __le16_to_cpu(readw((void __iomem *)ptr));
496 goto out;
497 break;
498 case 4: /* 4 bytes */
499 *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
500 goto out;
501 break;
502 }
503
504 while (i < size_bytes) {
505 if (size_bytes - i == 2) {
506 /* Handle 2 bytes in the end */
507 buf16 = (u16 *) buf;
508 *(buf16) = __le16_to_cpu(readw((void __iomem *)ptr));
509 i += 2;
510 } else {
511 /* Read 4 bytes */
512 *(buf) = __le32_to_cpu(readl((void __iomem *)ptr));
513 i += 4;
514 }
515 buf++;
516 ptr++;
517 }
518out:
519 return;
520}
521
522/*
523 * TODO:
524 * -Optimize
525 * -Rewrite cleaner
526 */
527static u32 write_mem32(void __iomem *mem_addr_start, u32 *buf,
528 u32 size_bytes)
529{
530 u32 i = 0;
531 u32 *ptr = (__force u32 *) mem_addr_start;
532 u16 *buf16;
533
534 if (unlikely(!ptr || !buf))
535 return 0;
536
537 /* shortcut for extremely often used cases */
538 switch (size_bytes) {
539 case 2: /* 2 bytes */
540 buf16 = (u16 *) buf;
541 writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
542 return 2;
543 break;
544 case 1: /*
545 * also needs to write 4 bytes in this case
546 * so falling through..
547 */
548 case 4: /* 4 bytes */
549 writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
550 return 4;
551 break;
552 }
553
554 while (i < size_bytes) {
555 if (size_bytes - i == 2) {
556 /* 2 bytes */
557 buf16 = (u16 *) buf;
558 writew(__cpu_to_le16(*buf16), (void __iomem *)ptr);
559 i += 2;
560 } else {
561 /* 4 bytes */
562 writel(__cpu_to_le32(*buf), (void __iomem *)ptr);
563 i += 4;
564 }
565 buf++;
566 ptr++;
567 }
568 return i;
569}
570
571/* Setup pointers to different channels and also setup buffer sizes. */
572static void setup_memory(struct nozomi *dc)
573{
574 void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
575 /* The length reported is including the length field of 4 bytes,
576 * hence subtract with 4.
577 */
578 const u16 buff_offset = 4;
579
580 /* Modem port dl configuration */
581 dc->port[PORT_MDM].dl_addr[CH_A] = offset;
582 dc->port[PORT_MDM].dl_addr[CH_B] =
583 (offset += dc->config_table.dl_mdm_len1);
584 dc->port[PORT_MDM].dl_size[CH_A] =
585 dc->config_table.dl_mdm_len1 - buff_offset;
586 dc->port[PORT_MDM].dl_size[CH_B] =
587 dc->config_table.dl_mdm_len2 - buff_offset;
588
589 /* Diag port dl configuration */
590 dc->port[PORT_DIAG].dl_addr[CH_A] =
591 (offset += dc->config_table.dl_mdm_len2);
592 dc->port[PORT_DIAG].dl_size[CH_A] =
593 dc->config_table.dl_diag_len1 - buff_offset;
594 dc->port[PORT_DIAG].dl_addr[CH_B] =
595 (offset += dc->config_table.dl_diag_len1);
596 dc->port[PORT_DIAG].dl_size[CH_B] =
597 dc->config_table.dl_diag_len2 - buff_offset;
598
599 /* App1 port dl configuration */
600 dc->port[PORT_APP1].dl_addr[CH_A] =
601 (offset += dc->config_table.dl_diag_len2);
602 dc->port[PORT_APP1].dl_size[CH_A] =
603 dc->config_table.dl_app1_len - buff_offset;
604
605 /* App2 port dl configuration */
606 dc->port[PORT_APP2].dl_addr[CH_A] =
607 (offset += dc->config_table.dl_app1_len);
608 dc->port[PORT_APP2].dl_size[CH_A] =
609 dc->config_table.dl_app2_len - buff_offset;
610
611 /* Ctrl dl configuration */
612 dc->port[PORT_CTRL].dl_addr[CH_A] =
613 (offset += dc->config_table.dl_app2_len);
614 dc->port[PORT_CTRL].dl_size[CH_A] =
615 dc->config_table.dl_ctrl_len - buff_offset;
616
617 offset = dc->base_addr + dc->config_table.ul_start;
618
619 /* Modem Port ul configuration */
620 dc->port[PORT_MDM].ul_addr[CH_A] = offset;
621 dc->port[PORT_MDM].ul_size[CH_A] =
622 dc->config_table.ul_mdm_len1 - buff_offset;
623 dc->port[PORT_MDM].ul_addr[CH_B] =
624 (offset += dc->config_table.ul_mdm_len1);
625 dc->port[PORT_MDM].ul_size[CH_B] =
626 dc->config_table.ul_mdm_len2 - buff_offset;
627
628 /* Diag port ul configuration */
629 dc->port[PORT_DIAG].ul_addr[CH_A] =
630 (offset += dc->config_table.ul_mdm_len2);
631 dc->port[PORT_DIAG].ul_size[CH_A] =
632 dc->config_table.ul_diag_len - buff_offset;
633
634 /* App1 port ul configuration */
635 dc->port[PORT_APP1].ul_addr[CH_A] =
636 (offset += dc->config_table.ul_diag_len);
637 dc->port[PORT_APP1].ul_size[CH_A] =
638 dc->config_table.ul_app1_len - buff_offset;
639
640 /* App2 port ul configuration */
641 dc->port[PORT_APP2].ul_addr[CH_A] =
642 (offset += dc->config_table.ul_app1_len);
643 dc->port[PORT_APP2].ul_size[CH_A] =
644 dc->config_table.ul_app2_len - buff_offset;
645
646 /* Ctrl ul configuration */
647 dc->port[PORT_CTRL].ul_addr[CH_A] =
648 (offset += dc->config_table.ul_app2_len);
649 dc->port[PORT_CTRL].ul_size[CH_A] =
650 dc->config_table.ul_ctrl_len - buff_offset;
651}
652
653/* Dump config table under initalization phase */
654#ifdef DEBUG
655static void dump_table(const struct nozomi *dc)
656{
657 DBG3("signature: 0x%08X", dc->config_table.signature);
658 DBG3("version: 0x%04X", dc->config_table.version);
659 DBG3("product_information: 0x%04X", \
660 dc->config_table.product_information);
661 DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
662 DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
663 DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
664 DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
665
666 DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
667 DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
668 dc->config_table.dl_mdm_len1);
669 DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
670 dc->config_table.dl_mdm_len2);
671 DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
672 dc->config_table.dl_diag_len1);
673 DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
674 dc->config_table.dl_diag_len2);
675 DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
676 dc->config_table.dl_app1_len);
677 DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
678 dc->config_table.dl_app2_len);
679 DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
680 dc->config_table.dl_ctrl_len);
681 DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
682 dc->config_table.ul_start);
683 DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
684 dc->config_table.ul_mdm_len1);
685 DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
686 dc->config_table.ul_mdm_len2);
687 DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
688 dc->config_table.ul_diag_len);
689 DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
690 dc->config_table.ul_app1_len);
691 DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
692 dc->config_table.ul_app2_len);
693 DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
694 dc->config_table.ul_ctrl_len);
695}
696#else
697static __inline__ void dump_table(const struct nozomi *dc) { }
698#endif
699
700/*
701 * Read configuration table from card under intalization phase
702 * Returns 1 if ok, else 0
703 */
704static int nozomi_read_config_table(struct nozomi *dc)
705{
706 read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
707 sizeof(struct config_table));
708
709 if (dc->config_table.signature != CONFIG_MAGIC) {
710 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
711 dc->config_table.signature, CONFIG_MAGIC);
712 return 0;
713 }
714
715 if ((dc->config_table.version == 0)
716 || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
717 int i;
718 DBG1("Second phase, configuring card");
719
720 setup_memory(dc);
721
722 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
723 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
724 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
725 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
726 dc->port[PORT_MDM].toggle_ul,
727 dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
728
729 dump_table(dc);
730
731 for (i = PORT_MDM; i < MAX_PORT; i++) {
732 dc->port[i].fifo_ul =
733 kfifo_alloc(FIFO_BUFFER_SIZE_UL, GFP_ATOMIC, NULL);
734 memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
735 memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
736 }
737
738 /* Enable control channel */
739 dc->last_ier = dc->last_ier | CTRL_DL;
740 writew(dc->last_ier, dc->reg_ier);
741
742 dev_info(&dc->pdev->dev, "Initialization OK!\n");
743 return 1;
744 }
745
746 if ((dc->config_table.version > 0)
747 && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
748 u32 offset = 0;
749 DBG1("First phase: pushing upload buffers, clearing download");
750
751 dev_info(&dc->pdev->dev, "Version of card: %d\n",
752 dc->config_table.version);
753
754 /* Here we should disable all I/O over F32. */
755 setup_memory(dc);
756
757 /*
758 * We should send ALL channel pair tokens back along
759 * with reset token
760 */
761
762 /* push upload modem buffers */
763 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
764 (u32 *) &offset, 4);
765 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
766 (u32 *) &offset, 4);
767
768 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
769
770 DBG1("First phase done");
771 }
772
773 return 1;
774}
775
776/* Enable uplink interrupts */
777static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
778{
779 u16 mask[NOZOMI_MAX_PORTS] = \
780 {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
781
782 if (port < NOZOMI_MAX_PORTS) {
783 dc->last_ier |= mask[port];
784 writew(dc->last_ier, dc->reg_ier);
785 } else {
786 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
787 }
788}
789
790/* Disable uplink interrupts */
791static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
792{
793 u16 mask[NOZOMI_MAX_PORTS] = \
794 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
795
796 if (port < NOZOMI_MAX_PORTS) {
797 dc->last_ier &= mask[port];
798 writew(dc->last_ier, dc->reg_ier);
799 } else {
800 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
801 }
802}
803
804/* Enable downlink interrupts */
805static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
806{
807 u16 mask[NOZOMI_MAX_PORTS] = \
808 {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
809
810 if (port < NOZOMI_MAX_PORTS) {
811 dc->last_ier |= mask[port];
812 writew(dc->last_ier, dc->reg_ier);
813 } else {
814 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
815 }
816}
817
818/* Disable downlink interrupts */
819static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
820{
821 u16 mask[NOZOMI_MAX_PORTS] = \
822 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
823
824 if (port < NOZOMI_MAX_PORTS) {
825 dc->last_ier &= mask[port];
826 writew(dc->last_ier, dc->reg_ier);
827 } else {
828 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
829 }
830}
831
832/*
833 * Return 1 - send buffer to card and ack.
834 * Return 0 - don't ack, don't send buffer to card.
835 */
836static int send_data(enum port_type index, struct nozomi *dc)
837{
838 u32 size = 0;
839 struct port *port = &dc->port[index];
840 u8 toggle = port->toggle_ul;
841 void __iomem *addr = port->ul_addr[toggle];
842 u32 ul_size = port->ul_size[toggle];
843 struct tty_struct *tty = port->tty;
844
845 /* Get data from tty and place in buf for now */
846 size = __kfifo_get(port->fifo_ul, dc->send_buf,
847 ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
848
849 if (size == 0) {
850 DBG4("No more data to send, disable link:");
851 return 0;
852 }
853
854 /* DUMP(buf, size); */
855
856 /* Write length + data */
857 write_mem32(addr, (u32 *) &size, 4);
858 write_mem32(addr + 4, (u32 *) dc->send_buf, size);
859
860 if (tty)
861 tty_wakeup(tty);
862
863 return 1;
864}
865
866/* If all data has been read, return 1, else 0 */
867static int receive_data(enum port_type index, struct nozomi *dc)
868{
869 u8 buf[RECEIVE_BUF_MAX] = { 0 };
870 int size;
871 u32 offset = 4;
872 struct port *port = &dc->port[index];
873 void __iomem *addr = port->dl_addr[port->toggle_dl];
874 struct tty_struct *tty = port->tty;
875 int i;
876
877 if (unlikely(!tty)) {
878 DBG1("tty not open for port: %d?", index);
879 return 1;
880 }
881
882 read_mem32((u32 *) &size, addr, 4);
883 /* DBG1( "%d bytes port: %d", size, index); */
884
885 if (test_bit(TTY_THROTTLED, &tty->flags)) {
886 DBG1("No room in tty, don't read data, don't ack interrupt, "
887 "disable interrupt");
888
889 /* disable interrupt in downlink... */
890 disable_transmit_dl(index, dc);
891 return 0;
892 }
893
894 if (unlikely(size == 0)) {
895 dev_err(&dc->pdev->dev, "size == 0?\n");
896 return 1;
897 }
898
899 tty_buffer_request_room(tty, size);
900
901 while (size > 0) {
902 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
903
904 if (size == 1) {
905 tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
906 size = 0;
907 } else if (size < RECEIVE_BUF_MAX) {
908 size -= tty_insert_flip_string(tty, (char *) buf, size);
909 } else {
910 i = tty_insert_flip_string(tty, \
911 (char *) buf, RECEIVE_BUF_MAX);
912 size -= i;
913 offset += i;
914 }
915 }
916
917 set_bit(index, &dc->flip);
918
919 return 1;
920}
921
922/* Debug for interrupts */
923#ifdef DEBUG
924static char *interrupt2str(u16 interrupt)
925{
926 static char buf[TMP_BUF_MAX];
927 char *p = buf;
928
929 interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
930 interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
931 "MDM_DL2 ") : NULL;
932
933 interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
934 "MDM_UL1 ") : NULL;
935 interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
936 "MDM_UL2 ") : NULL;
937
938 interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
939 "DIAG_DL1 ") : NULL;
940 interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
941 "DIAG_DL2 ") : NULL;
942
943 interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
944 "DIAG_UL ") : NULL;
945
946 interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
947 "APP1_DL ") : NULL;
948 interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
949 "APP2_DL ") : NULL;
950
951 interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
952 "APP1_UL ") : NULL;
953 interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
954 "APP2_UL ") : NULL;
955
956 interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
957 "CTRL_DL ") : NULL;
958 interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
959 "CTRL_UL ") : NULL;
960
961 interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
962 "RESET ") : NULL;
963
964 return buf;
965}
966#endif
967
968/*
969 * Receive flow control
970 * Return 1 - If ok, else 0
971 */
972static int receive_flow_control(struct nozomi *dc)
973{
974 enum port_type port = PORT_MDM;
975 struct ctrl_dl ctrl_dl;
976 struct ctrl_dl old_ctrl;
977 u16 enable_ier = 0;
978
979 read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
980
981 switch (ctrl_dl.port) {
982 case CTRL_CMD:
983 DBG1("The Base Band sends this value as a response to a "
984 "request for IMSI detach sent over the control "
985 "channel uplink (see section 7.6.1).");
986 break;
987 case CTRL_MDM:
988 port = PORT_MDM;
989 enable_ier = MDM_DL;
990 break;
991 case CTRL_DIAG:
992 port = PORT_DIAG;
993 enable_ier = DIAG_DL;
994 break;
995 case CTRL_APP1:
996 port = PORT_APP1;
997 enable_ier = APP1_DL;
998 break;
999 case CTRL_APP2:
1000 port = PORT_APP2;
1001 enable_ier = APP2_DL;
1002 break;
1003 default:
1004 dev_err(&dc->pdev->dev,
1005 "ERROR: flow control received for non-existing port\n");
1006 return 0;
1007 };
1008
1009 DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
1010 *((u16 *)&ctrl_dl));
1011
1012 old_ctrl = dc->port[port].ctrl_dl;
1013 dc->port[port].ctrl_dl = ctrl_dl;
1014
1015 if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
1016 DBG1("Disable interrupt (0x%04X) on port: %d",
1017 enable_ier, port);
1018 disable_transmit_ul(port, dc);
1019
1020 } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
1021
1022 if (__kfifo_len(dc->port[port].fifo_ul)) {
1023 DBG1("Enable interrupt (0x%04X) on port: %d",
1024 enable_ier, port);
1025 DBG1("Data in buffer [%d], enable transmit! ",
1026 __kfifo_len(dc->port[port].fifo_ul));
1027 enable_transmit_ul(port, dc);
1028 } else {
1029 DBG1("No data in buffer...");
1030 }
1031 }
1032
1033 if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
1034 DBG1(" No change in mctrl");
1035 return 1;
1036 }
1037 /* Update statistics */
1038 if (old_ctrl.CTS != ctrl_dl.CTS)
1039 dc->port[port].tty_icount.cts++;
1040 if (old_ctrl.DSR != ctrl_dl.DSR)
1041 dc->port[port].tty_icount.dsr++;
1042 if (old_ctrl.RI != ctrl_dl.RI)
1043 dc->port[port].tty_icount.rng++;
1044 if (old_ctrl.DCD != ctrl_dl.DCD)
1045 dc->port[port].tty_icount.dcd++;
1046
1047 wake_up_interruptible(&dc->port[port].tty_wait);
1048
1049 DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
1050 port,
1051 dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
1052 dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
1053
1054 return 1;
1055}
1056
1057static enum ctrl_port_type port2ctrl(enum port_type port,
1058 const struct nozomi *dc)
1059{
1060 switch (port) {
1061 case PORT_MDM:
1062 return CTRL_MDM;
1063 case PORT_DIAG:
1064 return CTRL_DIAG;
1065 case PORT_APP1:
1066 return CTRL_APP1;
1067 case PORT_APP2:
1068 return CTRL_APP2;
1069 default:
1070 dev_err(&dc->pdev->dev,
1071 "ERROR: send flow control " \
1072 "received for non-existing port\n");
1073 };
1074 return CTRL_ERROR;
1075}
1076
1077/*
1078 * Send flow control, can only update one channel at a time
1079 * Return 0 - If we have updated all flow control
1080 * Return 1 - If we need to update more flow control, ack current enable more
1081 */
1082static int send_flow_control(struct nozomi *dc)
1083{
1084 u32 i, more_flow_control_to_be_updated = 0;
1085 u16 *ctrl;
1086
1087 for (i = PORT_MDM; i < MAX_PORT; i++) {
1088 if (dc->port[i].update_flow_control) {
1089 if (more_flow_control_to_be_updated) {
1090 /* We have more flow control to be updated */
1091 return 1;
1092 }
1093 dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1094 ctrl = (u16 *)&dc->port[i].ctrl_ul;
1095 write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1096 (u32 *) ctrl, 2);
1097 dc->port[i].update_flow_control = 0;
1098 more_flow_control_to_be_updated = 1;
1099 }
1100 }
1101 return 0;
1102}
1103
1104/*
1105 * Handle donlink data, ports that are handled are modem and diagnostics
1106 * Return 1 - ok
1107 * Return 0 - toggle fields are out of sync
1108 */
1109static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1110 u16 read_iir, u16 mask1, u16 mask2)
1111{
1112 if (*toggle == 0 && read_iir & mask1) {
1113 if (receive_data(port, dc)) {
1114 writew(mask1, dc->reg_fcr);
1115 *toggle = !(*toggle);
1116 }
1117
1118 if (read_iir & mask2) {
1119 if (receive_data(port, dc)) {
1120 writew(mask2, dc->reg_fcr);
1121 *toggle = !(*toggle);
1122 }
1123 }
1124 } else if (*toggle == 1 && read_iir & mask2) {
1125 if (receive_data(port, dc)) {
1126 writew(mask2, dc->reg_fcr);
1127 *toggle = !(*toggle);
1128 }
1129
1130 if (read_iir & mask1) {
1131 if (receive_data(port, dc)) {
1132 writew(mask1, dc->reg_fcr);
1133 *toggle = !(*toggle);
1134 }
1135 }
1136 } else {
1137 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1138 *toggle);
1139 return 0;
1140 }
1141 return 1;
1142}
1143
1144/*
1145 * Handle uplink data, this is currently for the modem port
1146 * Return 1 - ok
1147 * Return 0 - toggle field are out of sync
1148 */
1149static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1150{
1151 u8 *toggle = &(dc->port[port].toggle_ul);
1152
1153 if (*toggle == 0 && read_iir & MDM_UL1) {
1154 dc->last_ier &= ~MDM_UL;
1155 writew(dc->last_ier, dc->reg_ier);
1156 if (send_data(port, dc)) {
1157 writew(MDM_UL1, dc->reg_fcr);
1158 dc->last_ier = dc->last_ier | MDM_UL;
1159 writew(dc->last_ier, dc->reg_ier);
1160 *toggle = !*toggle;
1161 }
1162
1163 if (read_iir & MDM_UL2) {
1164 dc->last_ier &= ~MDM_UL;
1165 writew(dc->last_ier, dc->reg_ier);
1166 if (send_data(port, dc)) {
1167 writew(MDM_UL2, dc->reg_fcr);
1168 dc->last_ier = dc->last_ier | MDM_UL;
1169 writew(dc->last_ier, dc->reg_ier);
1170 *toggle = !*toggle;
1171 }
1172 }
1173
1174 } else if (*toggle == 1 && read_iir & MDM_UL2) {
1175 dc->last_ier &= ~MDM_UL;
1176 writew(dc->last_ier, dc->reg_ier);
1177 if (send_data(port, dc)) {
1178 writew(MDM_UL2, dc->reg_fcr);
1179 dc->last_ier = dc->last_ier | MDM_UL;
1180 writew(dc->last_ier, dc->reg_ier);
1181 *toggle = !*toggle;
1182 }
1183
1184 if (read_iir & MDM_UL1) {
1185 dc->last_ier &= ~MDM_UL;
1186 writew(dc->last_ier, dc->reg_ier);
1187 if (send_data(port, dc)) {
1188 writew(MDM_UL1, dc->reg_fcr);
1189 dc->last_ier = dc->last_ier | MDM_UL;
1190 writew(dc->last_ier, dc->reg_ier);
1191 *toggle = !*toggle;
1192 }
1193 }
1194 } else {
1195 writew(read_iir & MDM_UL, dc->reg_fcr);
1196 dev_err(&dc->pdev->dev, "port out of sync!\n");
1197 return 0;
1198 }
1199 return 1;
1200}
1201
1202static irqreturn_t interrupt_handler(int irq, void *dev_id)
1203{
1204 struct nozomi *dc = dev_id;
1205 unsigned int a;
1206 u16 read_iir;
1207
1208 if (!dc)
1209 return IRQ_NONE;
1210
1211 spin_lock(&dc->spin_mutex);
1212 read_iir = readw(dc->reg_iir);
1213
1214 /* Card removed */
1215 if (read_iir == (u16)-1)
1216 goto none;
1217 /*
1218 * Just handle interrupt enabled in IER
1219 * (by masking with dc->last_ier)
1220 */
1221 read_iir &= dc->last_ier;
1222
1223 if (read_iir == 0)
1224 goto none;
1225
1226
1227 DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1228 dc->last_ier);
1229
1230 if (read_iir & RESET) {
1231 if (unlikely(!nozomi_read_config_table(dc))) {
1232 dc->last_ier = 0x0;
1233 writew(dc->last_ier, dc->reg_ier);
1234 dev_err(&dc->pdev->dev, "Could not read status from "
1235 "card, we should disable interface\n");
1236 } else {
1237 writew(RESET, dc->reg_fcr);
1238 }
1239 /* No more useful info if this was the reset interrupt. */
1240 goto exit_handler;
1241 }
1242 if (read_iir & CTRL_UL) {
1243 DBG1("CTRL_UL");
1244 dc->last_ier &= ~CTRL_UL;
1245 writew(dc->last_ier, dc->reg_ier);
1246 if (send_flow_control(dc)) {
1247 writew(CTRL_UL, dc->reg_fcr);
1248 dc->last_ier = dc->last_ier | CTRL_UL;
1249 writew(dc->last_ier, dc->reg_ier);
1250 }
1251 }
1252 if (read_iir & CTRL_DL) {
1253 receive_flow_control(dc);
1254 writew(CTRL_DL, dc->reg_fcr);
1255 }
1256 if (read_iir & MDM_DL) {
1257 if (!handle_data_dl(dc, PORT_MDM,
1258 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1259 MDM_DL1, MDM_DL2)) {
1260 dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1261 goto exit_handler;
1262 }
1263 }
1264 if (read_iir & MDM_UL) {
1265 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1266 dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1267 goto exit_handler;
1268 }
1269 }
1270 if (read_iir & DIAG_DL) {
1271 if (!handle_data_dl(dc, PORT_DIAG,
1272 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1273 DIAG_DL1, DIAG_DL2)) {
1274 dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1275 goto exit_handler;
1276 }
1277 }
1278 if (read_iir & DIAG_UL) {
1279 dc->last_ier &= ~DIAG_UL;
1280 writew(dc->last_ier, dc->reg_ier);
1281 if (send_data(PORT_DIAG, dc)) {
1282 writew(DIAG_UL, dc->reg_fcr);
1283 dc->last_ier = dc->last_ier | DIAG_UL;
1284 writew(dc->last_ier, dc->reg_ier);
1285 }
1286 }
1287 if (read_iir & APP1_DL) {
1288 if (receive_data(PORT_APP1, dc))
1289 writew(APP1_DL, dc->reg_fcr);
1290 }
1291 if (read_iir & APP1_UL) {
1292 dc->last_ier &= ~APP1_UL;
1293 writew(dc->last_ier, dc->reg_ier);
1294 if (send_data(PORT_APP1, dc)) {
1295 writew(APP1_UL, dc->reg_fcr);
1296 dc->last_ier = dc->last_ier | APP1_UL;
1297 writew(dc->last_ier, dc->reg_ier);
1298 }
1299 }
1300 if (read_iir & APP2_DL) {
1301 if (receive_data(PORT_APP2, dc))
1302 writew(APP2_DL, dc->reg_fcr);
1303 }
1304 if (read_iir & APP2_UL) {
1305 dc->last_ier &= ~APP2_UL;
1306 writew(dc->last_ier, dc->reg_ier);
1307 if (send_data(PORT_APP2, dc)) {
1308 writew(APP2_UL, dc->reg_fcr);
1309 dc->last_ier = dc->last_ier | APP2_UL;
1310 writew(dc->last_ier, dc->reg_ier);
1311 }
1312 }
1313
1314exit_handler:
1315 spin_unlock(&dc->spin_mutex);
1316 for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1317 if (test_and_clear_bit(a, &dc->flip))
1318 tty_flip_buffer_push(dc->port[a].tty);
1319 return IRQ_HANDLED;
1320none:
1321 spin_unlock(&dc->spin_mutex);
1322 return IRQ_NONE;
1323}
1324
1325static void nozomi_get_card_type(struct nozomi *dc)
1326{
1327 int i;
1328 u32 size = 0;
1329
1330 for (i = 0; i < 6; i++)
1331 size += pci_resource_len(dc->pdev, i);
1332
1333 /* Assume card type F32_8 if no match */
1334 dc->card_type = size == 2048 ? F32_2 : F32_8;
1335
1336 dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1337}
1338
1339static void nozomi_setup_private_data(struct nozomi *dc)
1340{
1341 void __iomem *offset = dc->base_addr + dc->card_type / 2;
1342 unsigned int i;
1343
1344 dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1345 dc->reg_iir = (void __iomem *)(offset + R_IIR);
1346 dc->reg_ier = (void __iomem *)(offset + R_IER);
1347 dc->last_ier = 0;
1348 dc->flip = 0;
1349
1350 dc->port[PORT_MDM].token_dl = MDM_DL;
1351 dc->port[PORT_DIAG].token_dl = DIAG_DL;
1352 dc->port[PORT_APP1].token_dl = APP1_DL;
1353 dc->port[PORT_APP2].token_dl = APP2_DL;
1354
1355 for (i = 0; i < MAX_PORT; i++)
1356 init_waitqueue_head(&dc->port[i].tty_wait);
1357}
1358
1359static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1360 char *buf)
1361{
1362 struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1363
1364 return sprintf(buf, "%d\n", dc->card_type);
1365}
1366static DEVICE_ATTR(card_type, 0444, card_type_show, NULL);
1367
1368static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1369 char *buf)
1370{
1371 struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
1372
1373 return sprintf(buf, "%u\n", dc->open_ttys);
1374}
1375static DEVICE_ATTR(open_ttys, 0444, open_ttys_show, NULL);
1376
1377static void make_sysfs_files(struct nozomi *dc)
1378{
1379 if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1380 dev_err(&dc->pdev->dev,
1381 "Could not create sysfs file for card_type\n");
1382 if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1383 dev_err(&dc->pdev->dev,
1384 "Could not create sysfs file for open_ttys\n");
1385}
1386
1387static void remove_sysfs_files(struct nozomi *dc)
1388{
1389 device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1390 device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1391}
1392
1393/* Allocate memory for one device */
1394static int __devinit nozomi_card_init(struct pci_dev *pdev,
1395 const struct pci_device_id *ent)
1396{
1397 resource_size_t start;
1398 int ret;
1399 struct nozomi *dc = NULL;
1400 int ndev_idx;
1401 int i;
1402
1403 dev_dbg(&pdev->dev, "Init, new card found\n");
1404
1405 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1406 if (!ndevs[ndev_idx])
1407 break;
1408
1409 if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1410 dev_err(&pdev->dev, "no free tty range for this card left\n");
1411 ret = -EIO;
1412 goto err;
1413 }
1414
1415 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1416 if (unlikely(!dc)) {
1417 dev_err(&pdev->dev, "Could not allocate memory\n");
1418 ret = -ENOMEM;
1419 goto err_free;
1420 }
1421
1422 dc->pdev = pdev;
1423
1424 /* Find out what card type it is */
1425 nozomi_get_card_type(dc);
1426
1427 ret = pci_enable_device(dc->pdev);
1428 if (ret) {
1429 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1430 goto err_free;
1431 }
1432
1433 start = pci_resource_start(dc->pdev, 0);
1434 if (start == 0) {
1435 dev_err(&pdev->dev, "No I/O address for card detected\n");
1436 ret = -ENODEV;
1437 goto err_disable_device;
1438 }
1439
1440 ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1441 if (ret) {
1442 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1443 (int) /* nozomi_private.io_addr */ 0);
1444 goto err_disable_device;
1445 }
1446
1447 dc->base_addr = ioremap(start, dc->card_type);
1448 if (!dc->base_addr) {
1449 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1450 ret = -ENODEV;
1451 goto err_rel_regs;
1452 }
1453
1454 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1455 if (!dc->send_buf) {
1456 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1457 ret = -ENOMEM;
1458 goto err_free_sbuf;
1459 }
1460
1461 spin_lock_init(&dc->spin_mutex);
1462
1463 nozomi_setup_private_data(dc);
1464
1465 /* Disable all interrupts */
1466 dc->last_ier = 0;
1467 writew(dc->last_ier, dc->reg_ier);
1468
1469 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1470 NOZOMI_NAME, dc);
1471 if (unlikely(ret)) {
1472 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1473 goto err_free_sbuf;
1474 }
1475
1476 DBG1("base_addr: %p", dc->base_addr);
1477
1478 make_sysfs_files(dc);
1479
1480 dc->index_start = ndev_idx * MAX_PORT;
1481 ndevs[ndev_idx] = dc;
1482
1483 for (i = 0; i < MAX_PORT; i++) {
1484 mutex_init(&dc->port[i].tty_sem);
1485 dc->port[i].tty_open_count = 0;
1486 dc->port[i].tty = NULL;
1487 tty_register_device(ntty_driver, dc->index_start + i,
1488 &pdev->dev);
1489 }
1490
1491 /* Enable RESET interrupt. */
1492 dc->last_ier = RESET;
1493 writew(dc->last_ier, dc->reg_ier);
1494
1495 pci_set_drvdata(pdev, dc);
1496
1497 return 0;
1498
1499err_free_sbuf:
1500 kfree(dc->send_buf);
1501 iounmap(dc->base_addr);
1502err_rel_regs:
1503 pci_release_regions(pdev);
1504err_disable_device:
1505 pci_disable_device(pdev);
1506err_free:
1507 kfree(dc);
1508err:
1509 return ret;
1510}
1511
1512static void __devexit tty_exit(struct nozomi *dc)
1513{
1514 unsigned int i;
1515
1516 DBG1(" ");
1517
1518 flush_scheduled_work();
1519
1520 for (i = 0; i < MAX_PORT; ++i)
1521 if (dc->port[i].tty && \
1522 list_empty(&dc->port[i].tty->hangup_work.entry))
1523 tty_hangup(dc->port[i].tty);
1524
1525 while (dc->open_ttys)
1526 msleep(1);
1527
1528 for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
1529 tty_unregister_device(ntty_driver, i);
1530}
1531
1532/* Deallocate memory for one device */
1533static void __devexit nozomi_card_exit(struct pci_dev *pdev)
1534{
1535 int i;
1536 struct ctrl_ul ctrl;
1537 struct nozomi *dc = pci_get_drvdata(pdev);
1538
1539 /* Disable all interrupts */
1540 dc->last_ier = 0;
1541 writew(dc->last_ier, dc->reg_ier);
1542
1543 tty_exit(dc);
1544
1545 /* Send 0x0001, command card to resend the reset token. */
1546 /* This is to get the reset when the module is reloaded. */
1547 ctrl.port = 0x00;
1548 ctrl.reserved = 0;
1549 ctrl.RTS = 0;
1550 ctrl.DTR = 1;
1551 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1552
1553 /* Setup dc->reg addresses to we can use defines here */
1554 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1555 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
1556
1557 remove_sysfs_files(dc);
1558
1559 free_irq(pdev->irq, dc);
1560
1561 for (i = 0; i < MAX_PORT; i++)
1562 if (dc->port[i].fifo_ul)
1563 kfifo_free(dc->port[i].fifo_ul);
1564
1565 kfree(dc->send_buf);
1566
1567 iounmap(dc->base_addr);
1568
1569 pci_release_regions(pdev);
1570
1571 pci_disable_device(pdev);
1572
1573 ndevs[dc->index_start / MAX_PORT] = NULL;
1574
1575 kfree(dc);
1576}
1577
1578static void set_rts(const struct tty_struct *tty, int rts)
1579{
1580 struct port *port = get_port_by_tty(tty);
1581
1582 port->ctrl_ul.RTS = rts;
1583 port->update_flow_control = 1;
1584 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1585}
1586
1587static void set_dtr(const struct tty_struct *tty, int dtr)
1588{
1589 struct port *port = get_port_by_tty(tty);
1590
1591 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1592
1593 port->ctrl_ul.DTR = dtr;
1594 port->update_flow_control = 1;
1595 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1596}
1597
1598/*
1599 * ----------------------------------------------------------------------------
1600 * TTY code
1601 * ----------------------------------------------------------------------------
1602 */
1603
1604/* Called when the userspace process opens the tty, /dev/noz*. */
1605static int ntty_open(struct tty_struct *tty, struct file *file)
1606{
1607 struct port *port = get_port_by_tty(tty);
1608 struct nozomi *dc = get_dc_by_tty(tty);
1609 unsigned long flags;
1610
1611 if (!port || !dc)
1612 return -ENODEV;
1613
1614 if (mutex_lock_interruptible(&port->tty_sem))
1615 return -ERESTARTSYS;
1616
1617 port->tty_open_count++;
1618 dc->open_ttys++;
1619
1620 /* Enable interrupt downlink for channel */
1621 if (port->tty_open_count == 1) {
1622 tty->low_latency = 1;
1623 tty->driver_data = port;
1624 port->tty = tty;
1625 DBG1("open: %d", port->token_dl);
1626 spin_lock_irqsave(&dc->spin_mutex, flags);
1627 dc->last_ier = dc->last_ier | port->token_dl;
1628 writew(dc->last_ier, dc->reg_ier);
1629 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1630 }
1631
1632 mutex_unlock(&port->tty_sem);
1633
1634 return 0;
1635}
1636
1637/* Called when the userspace process close the tty, /dev/noz*. */
1638static void ntty_close(struct tty_struct *tty, struct file *file)
1639{
1640 struct nozomi *dc = get_dc_by_tty(tty);
1641 struct port *port = tty->driver_data;
1642 unsigned long flags;
1643
1644 if (!dc || !port)
1645 return;
1646
1647 if (mutex_lock_interruptible(&port->tty_sem))
1648 return;
1649
1650 if (!port->tty_open_count)
1651 goto exit;
1652
1653 dc->open_ttys--;
1654 port->tty_open_count--;
1655
1656 if (port->tty_open_count == 0) {
1657 DBG1("close: %d", port->token_dl);
1658 spin_lock_irqsave(&dc->spin_mutex, flags);
1659 dc->last_ier &= ~(port->token_dl);
1660 writew(dc->last_ier, dc->reg_ier);
1661 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1662 }
1663
1664exit:
1665 mutex_unlock(&port->tty_sem);
1666}
1667
1668/*
1669 * called when the userspace process writes to the tty (/dev/noz*).
1670 * Data is inserted into a fifo, which is then read and transfered to the modem.
1671 */
1672static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1673 int count)
1674{
1675 int rval = -EINVAL;
1676 struct nozomi *dc = get_dc_by_tty(tty);
1677 struct port *port = tty->driver_data;
1678 unsigned long flags;
1679
1680 /* DBG1( "WRITEx: %d, index = %d", count, index); */
1681
1682 if (!dc || !port)
1683 return -ENODEV;
1684
1685 if (unlikely(!mutex_trylock(&port->tty_sem))) {
1686 /*
1687 * must test lock as tty layer wraps calls
1688 * to this function with BKL
1689 */
1690 dev_err(&dc->pdev->dev, "Would have deadlocked - "
1691 "return EAGAIN\n");
1692 return -EAGAIN;
1693 }
1694
1695 if (unlikely(!port->tty_open_count)) {
1696 DBG1(" ");
1697 goto exit;
1698 }
1699
1700 rval = __kfifo_put(port->fifo_ul, (unsigned char *)buffer, count);
1701
1702 /* notify card */
1703 if (unlikely(dc == NULL)) {
1704 DBG1("No device context?");
1705 goto exit;
1706 }
1707
1708 spin_lock_irqsave(&dc->spin_mutex, flags);
1709 /* CTS is only valid on the modem channel */
1710 if (port == &(dc->port[PORT_MDM])) {
1711 if (port->ctrl_dl.CTS) {
1712 DBG4("Enable interrupt");
1713 enable_transmit_ul(tty->index % MAX_PORT, dc);
1714 } else {
1715 dev_err(&dc->pdev->dev,
1716 "CTS not active on modem port?\n");
1717 }
1718 } else {
1719 enable_transmit_ul(tty->index % MAX_PORT, dc);
1720 }
1721 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1722
1723exit:
1724 mutex_unlock(&port->tty_sem);
1725 return rval;
1726}
1727
1728/*
1729 * Calculate how much is left in device
1730 * This method is called by the upper tty layer.
1731 * #according to sources N_TTY.c it expects a value >= 0 and
1732 * does not check for negative values.
1733 */
1734static int ntty_write_room(struct tty_struct *tty)
1735{
1736 struct port *port = tty->driver_data;
1737 int room = 0;
1738 struct nozomi *dc = get_dc_by_tty(tty);
1739
1740 if (!dc || !port)
1741 return 0;
1742 if (!mutex_trylock(&port->tty_sem))
1743 return 0;
1744
1745 if (!port->tty_open_count)
1746 goto exit;
1747
1748 room = port->fifo_ul->size - __kfifo_len(port->fifo_ul);
1749
1750exit:
1751 mutex_unlock(&port->tty_sem);
1752 return room;
1753}
1754
1755/* Gets io control parameters */
1756static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
1757{
1758 struct port *port = tty->driver_data;
1759 struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1760 struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1761
1762 return (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1763 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1764 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1765 (ctrl_dl->RI ? TIOCM_RNG : 0) |
1766 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1767 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1768}
1769
1770/* Sets io controls parameters */
1771static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
1772 unsigned int set, unsigned int clear)
1773{
1774 if (set & TIOCM_RTS)
1775 set_rts(tty, 1);
1776 else if (clear & TIOCM_RTS)
1777 set_rts(tty, 0);
1778
1779 if (set & TIOCM_DTR)
1780 set_dtr(tty, 1);
1781 else if (clear & TIOCM_DTR)
1782 set_dtr(tty, 0);
1783
1784 return 0;
1785}
1786
1787static int ntty_cflags_changed(struct port *port, unsigned long flags,
1788 struct async_icount *cprev)
1789{
1790 struct async_icount cnow = port->tty_icount;
1791 int ret;
1792
1793 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1794 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1795 ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1796 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1797
1798 *cprev = cnow;
1799
1800 return ret;
1801}
1802
1803static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
1804{
1805 struct async_icount cnow = port->tty_icount;
1806 struct serial_icounter_struct icount;
1807
1808 icount.cts = cnow.cts;
1809 icount.dsr = cnow.dsr;
1810 icount.rng = cnow.rng;
1811 icount.dcd = cnow.dcd;
1812 icount.rx = cnow.rx;
1813 icount.tx = cnow.tx;
1814 icount.frame = cnow.frame;
1815 icount.overrun = cnow.overrun;
1816 icount.parity = cnow.parity;
1817 icount.brk = cnow.brk;
1818 icount.buf_overrun = cnow.buf_overrun;
1819
1820 return copy_to_user(argp, &icount, sizeof(icount));
1821}
1822
1823static int ntty_ioctl(struct tty_struct *tty, struct file *file,
1824 unsigned int cmd, unsigned long arg)
1825{
1826 struct port *port = tty->driver_data;
1827 void __user *argp = (void __user *)arg;
1828 int rval = -ENOIOCTLCMD;
1829
1830 DBG1("******** IOCTL, cmd: %d", cmd);
1831
1832 switch (cmd) {
1833 case TIOCMIWAIT: {
1834 struct async_icount cprev = port->tty_icount;
1835
1836 rval = wait_event_interruptible(port->tty_wait,
1837 ntty_cflags_changed(port, arg, &cprev));
1838 break;
1839 } case TIOCGICOUNT:
1840 rval = ntty_ioctl_tiocgicount(port, argp);
1841 break;
1842 default:
1843 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1844 break;
1845 };
1846
1847 return rval;
1848}
1849
1850/*
1851 * Called by the upper tty layer when tty buffers are ready
1852 * to receive data again after a call to throttle.
1853 */
1854static void ntty_unthrottle(struct tty_struct *tty)
1855{
1856 struct nozomi *dc = get_dc_by_tty(tty);
1857 unsigned long flags;
1858
1859 DBG1("UNTHROTTLE");
1860 spin_lock_irqsave(&dc->spin_mutex, flags);
1861 enable_transmit_dl(tty->index % MAX_PORT, dc);
1862 set_rts(tty, 1);
1863
1864 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1865}
1866
1867/*
1868 * Called by the upper tty layer when the tty buffers are almost full.
1869 * The driver should stop send more data.
1870 */
1871static void ntty_throttle(struct tty_struct *tty)
1872{
1873 struct nozomi *dc = get_dc_by_tty(tty);
1874 unsigned long flags;
1875
1876 DBG1("THROTTLE");
1877 spin_lock_irqsave(&dc->spin_mutex, flags);
1878 set_rts(tty, 0);
1879 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1880}
1881
1882/* just to discard single character writes */
1883static void ntty_put_char(struct tty_struct *tty, unsigned char c)
1884{
1885 /* FIXME !!! */
1886 DBG2("PUT CHAR Function: %c", c);
1887}
1888
1889/* Returns number of chars in buffer, called by tty layer */
1890static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1891{
1892 struct port *port = tty->driver_data;
1893 struct nozomi *dc = get_dc_by_tty(tty);
1894 s32 rval;
1895
1896 if (unlikely(!dc || !port)) {
1897 rval = -ENODEV;
1898 goto exit_in_buffer;
1899 }
1900
1901 if (unlikely(!port->tty_open_count)) {
1902 dev_err(&dc->pdev->dev, "No tty open?\n");
1903 rval = -ENODEV;
1904 goto exit_in_buffer;
1905 }
1906
1907 rval = __kfifo_len(port->fifo_ul);
1908
1909exit_in_buffer:
1910 return rval;
1911}
1912
1913static struct tty_operations tty_ops = {
1914 .ioctl = ntty_ioctl,
1915 .open = ntty_open,
1916 .close = ntty_close,
1917 .write = ntty_write,
1918 .write_room = ntty_write_room,
1919 .unthrottle = ntty_unthrottle,
1920 .throttle = ntty_throttle,
1921 .chars_in_buffer = ntty_chars_in_buffer,
1922 .put_char = ntty_put_char,
1923 .tiocmget = ntty_tiocmget,
1924 .tiocmset = ntty_tiocmset,
1925};
1926
1927/* Module initialization */
1928static struct pci_driver nozomi_driver = {
1929 .name = NOZOMI_NAME,
1930 .id_table = nozomi_pci_tbl,
1931 .probe = nozomi_card_init,
1932 .remove = __devexit_p(nozomi_card_exit),
1933};
1934
1935static __init int nozomi_init(void)
1936{
1937 int ret;
1938
1939 printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1940
1941 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1942 if (!ntty_driver)
1943 return -ENOMEM;
1944
1945 ntty_driver->owner = THIS_MODULE;
1946 ntty_driver->driver_name = NOZOMI_NAME_TTY;
1947 ntty_driver->name = "noz";
1948 ntty_driver->major = 0;
1949 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1950 ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1951 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1952 ntty_driver->init_termios = tty_std_termios;
1953 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1954 HUPCL | CLOCAL;
1955 ntty_driver->init_termios.c_ispeed = 115200;
1956 ntty_driver->init_termios.c_ospeed = 115200;
1957 tty_set_operations(ntty_driver, &tty_ops);
1958
1959 ret = tty_register_driver(ntty_driver);
1960 if (ret) {
1961 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1962 goto free_tty;
1963 }
1964
1965 ret = pci_register_driver(&nozomi_driver);
1966 if (ret) {
1967 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1968 goto unr_tty;
1969 }
1970
1971 return 0;
1972unr_tty:
1973 tty_unregister_driver(ntty_driver);
1974free_tty:
1975 put_tty_driver(ntty_driver);
1976 return ret;
1977}
1978
1979static __exit void nozomi_exit(void)
1980{
1981 printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1982 pci_unregister_driver(&nozomi_driver);
1983 tty_unregister_driver(ntty_driver);
1984 put_tty_driver(ntty_driver);
1985}
1986
1987module_init(nozomi_init);
1988module_exit(nozomi_exit);
1989
1990module_param(debug, int, S_IRUGO | S_IWUSR);
1991
1992MODULE_LICENSE("Dual BSD/GPL");
1993MODULE_DESCRIPTION(DRIVER_DESC);
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