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Merge branch 'work.vboxsf' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[mirror_ubuntu-hirsute-kernel.git] / drivers / tty / nozomi.c
1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
2 /*
3 * nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
4 *
5 * Written by: Ulf Jakobsson,
6 * Jan Åkerfeldt,
7 * Stefan Thomasson,
8 *
9 * Maintained by: Paul Hardwick (p.hardwick@option.com)
10 *
11 * Patches:
12 * Locking code changes for Vodafone by Sphere Systems Ltd,
13 * Andrew Bird (ajb@spheresystems.co.uk )
14 * & Phil Sanderson
15 *
16 * Source has been ported from an implementation made by Filip Aben @ Option
17 *
18 * --------------------------------------------------------------------------
19 *
20 * Copyright (c) 2005,2006 Option Wireless Sweden AB
21 * Copyright (c) 2006 Sphere Systems Ltd
22 * Copyright (c) 2006 Option Wireless n/v
23 * All rights Reserved.
24 *
25 * --------------------------------------------------------------------------
26 */
27
28 /* Enable this to have a lot of debug printouts */
29 #define DEBUG
30
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/pci.h>
34 #include <linux/ioport.h>
35 #include <linux/tty.h>
36 #include <linux/tty_driver.h>
37 #include <linux/tty_flip.h>
38 #include <linux/sched.h>
39 #include <linux/serial.h>
40 #include <linux/interrupt.h>
41 #include <linux/kmod.h>
42 #include <linux/init.h>
43 #include <linux/kfifo.h>
44 #include <linux/uaccess.h>
45 #include <linux/slab.h>
46 #include <asm/byteorder.h>
47
48 #include <linux/delay.h>
49
50
51 #define VERSION_STRING DRIVER_DESC " 2.1d"
52
53 /* Default debug printout level */
54 #define NOZOMI_DEBUG_LEVEL 0x00
55 static int debug = NOZOMI_DEBUG_LEVEL;
56 module_param(debug, int, S_IRUGO | S_IWUSR);
57
58 /* Macros definitions */
59 #define DBG_(lvl, fmt, args...) \
60 do { \
61 if (lvl & debug) \
62 pr_debug("[%d] %s(): " fmt "\n", \
63 __LINE__, __func__, ##args); \
64 } while (0)
65
66 #define DBG1(args...) DBG_(0x01, ##args)
67 #define DBG2(args...) DBG_(0x02, ##args)
68 #define DBG3(args...) DBG_(0x04, ##args)
69 #define DBG4(args...) DBG_(0x08, ##args)
70
71 /* TODO: rewrite to optimize macros... */
72
73 #define TMP_BUF_MAX 256
74
75 #define DUMP(buf__, len__) \
76 do { \
77 char tbuf[TMP_BUF_MAX] = {0}; \
78 if (len__ > 1) { \
79 u32 data_len = min_t(u32, len__, TMP_BUF_MAX); \
80 strscpy(tbuf, buf__, data_len); \
81 if (tbuf[data_len - 2] == '\r') \
82 tbuf[data_len - 2] = 'r'; \
83 DBG1("SENDING: '%s' (%d+n)", tbuf, len__); \
84 } else { \
85 DBG1("SENDING: '%s' (%d)", tbuf, len__); \
86 } \
87 } while (0)
88
89 /* Defines */
90 #define NOZOMI_NAME "nozomi"
91 #define NOZOMI_NAME_TTY "nozomi_tty"
92 #define DRIVER_DESC "Nozomi driver"
93
94 #define NTTY_TTY_MAXMINORS 256
95 #define NTTY_FIFO_BUFFER_SIZE 8192
96
97 /* Must be power of 2 */
98 #define FIFO_BUFFER_SIZE_UL 8192
99
100 /* Size of tmp send buffer to card */
101 #define SEND_BUF_MAX 1024
102 #define RECEIVE_BUF_MAX 4
103
104
105 #define R_IIR 0x0000 /* Interrupt Identity Register */
106 #define R_FCR 0x0000 /* Flow Control Register */
107 #define R_IER 0x0004 /* Interrupt Enable Register */
108
109 #define NOZOMI_CONFIG_MAGIC 0xEFEFFEFE
110 #define TOGGLE_VALID 0x0000
111
112 /* Definition of interrupt tokens */
113 #define MDM_DL1 0x0001
114 #define MDM_UL1 0x0002
115 #define MDM_DL2 0x0004
116 #define MDM_UL2 0x0008
117 #define DIAG_DL1 0x0010
118 #define DIAG_DL2 0x0020
119 #define DIAG_UL 0x0040
120 #define APP1_DL 0x0080
121 #define APP1_UL 0x0100
122 #define APP2_DL 0x0200
123 #define APP2_UL 0x0400
124 #define CTRL_DL 0x0800
125 #define CTRL_UL 0x1000
126 #define RESET 0x8000
127
128 #define MDM_DL (MDM_DL1 | MDM_DL2)
129 #define MDM_UL (MDM_UL1 | MDM_UL2)
130 #define DIAG_DL (DIAG_DL1 | DIAG_DL2)
131
132 /* modem signal definition */
133 #define CTRL_DSR 0x0001
134 #define CTRL_DCD 0x0002
135 #define CTRL_RI 0x0004
136 #define CTRL_CTS 0x0008
137
138 #define CTRL_DTR 0x0001
139 #define CTRL_RTS 0x0002
140
141 #define MAX_PORT 4
142 #define NOZOMI_MAX_PORTS 5
143 #define NOZOMI_MAX_CARDS (NTTY_TTY_MAXMINORS / MAX_PORT)
144
145 /* Type definitions */
146
147 /*
148 * There are two types of nozomi cards,
149 * one with 2048 memory and with 8192 memory
150 */
151 enum card_type {
152 F32_2 = 2048, /* 512 bytes downlink + uplink * 2 -> 2048 */
153 F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
154 };
155
156 /* Initialization states a card can be in */
157 enum card_state {
158 NOZOMI_STATE_UNKNOWN = 0,
159 NOZOMI_STATE_ENABLED = 1, /* pci device enabled */
160 NOZOMI_STATE_ALLOCATED = 2, /* config setup done */
161 NOZOMI_STATE_READY = 3, /* flowcontrols received */
162 };
163
164 /* Two different toggle channels exist */
165 enum channel_type {
166 CH_A = 0,
167 CH_B = 1,
168 };
169
170 /* Port definition for the card regarding flow control */
171 enum ctrl_port_type {
172 CTRL_CMD = 0,
173 CTRL_MDM = 1,
174 CTRL_DIAG = 2,
175 CTRL_APP1 = 3,
176 CTRL_APP2 = 4,
177 CTRL_ERROR = -1,
178 };
179
180 /* Ports that the nozomi has */
181 enum port_type {
182 PORT_MDM = 0,
183 PORT_DIAG = 1,
184 PORT_APP1 = 2,
185 PORT_APP2 = 3,
186 PORT_CTRL = 4,
187 PORT_ERROR = -1,
188 };
189
190 #ifdef __BIG_ENDIAN
191 /* Big endian */
192
193 struct toggles {
194 unsigned int enabled:5; /*
195 * Toggle fields are valid if enabled is 0,
196 * else A-channels must always be used.
197 */
198 unsigned int diag_dl:1;
199 unsigned int mdm_dl:1;
200 unsigned int mdm_ul:1;
201 } __attribute__ ((packed));
202
203 /* Configuration table to read at startup of card */
204 /* Is for now only needed during initialization phase */
205 struct config_table {
206 u32 signature;
207 u16 product_information;
208 u16 version;
209 u8 pad3[3];
210 struct toggles toggle;
211 u8 pad1[4];
212 u16 dl_mdm_len1; /*
213 * If this is 64, it can hold
214 * 60 bytes + 4 that is length field
215 */
216 u16 dl_start;
217
218 u16 dl_diag_len1;
219 u16 dl_mdm_len2; /*
220 * If this is 64, it can hold
221 * 60 bytes + 4 that is length field
222 */
223 u16 dl_app1_len;
224
225 u16 dl_diag_len2;
226 u16 dl_ctrl_len;
227 u16 dl_app2_len;
228 u8 pad2[16];
229 u16 ul_mdm_len1;
230 u16 ul_start;
231 u16 ul_diag_len;
232 u16 ul_mdm_len2;
233 u16 ul_app1_len;
234 u16 ul_app2_len;
235 u16 ul_ctrl_len;
236 } __attribute__ ((packed));
237
238 /* This stores all control downlink flags */
239 struct ctrl_dl {
240 u8 port;
241 unsigned int reserved:4;
242 unsigned int CTS:1;
243 unsigned int RI:1;
244 unsigned int DCD:1;
245 unsigned int DSR:1;
246 } __attribute__ ((packed));
247
248 /* This stores all control uplink flags */
249 struct ctrl_ul {
250 u8 port;
251 unsigned int reserved:6;
252 unsigned int RTS:1;
253 unsigned int DTR:1;
254 } __attribute__ ((packed));
255
256 #else
257 /* Little endian */
258
259 /* This represents the toggle information */
260 struct toggles {
261 unsigned int mdm_ul:1;
262 unsigned int mdm_dl:1;
263 unsigned int diag_dl:1;
264 unsigned int enabled:5; /*
265 * Toggle fields are valid if enabled is 0,
266 * else A-channels must always be used.
267 */
268 } __attribute__ ((packed));
269
270 /* Configuration table to read at startup of card */
271 struct config_table {
272 u32 signature;
273 u16 version;
274 u16 product_information;
275 struct toggles toggle;
276 u8 pad1[7];
277 u16 dl_start;
278 u16 dl_mdm_len1; /*
279 * If this is 64, it can hold
280 * 60 bytes + 4 that is length field
281 */
282 u16 dl_mdm_len2;
283 u16 dl_diag_len1;
284 u16 dl_diag_len2;
285 u16 dl_app1_len;
286 u16 dl_app2_len;
287 u16 dl_ctrl_len;
288 u8 pad2[16];
289 u16 ul_start;
290 u16 ul_mdm_len2;
291 u16 ul_mdm_len1;
292 u16 ul_diag_len;
293 u16 ul_app1_len;
294 u16 ul_app2_len;
295 u16 ul_ctrl_len;
296 } __attribute__ ((packed));
297
298 /* This stores all control downlink flags */
299 struct ctrl_dl {
300 unsigned int DSR:1;
301 unsigned int DCD:1;
302 unsigned int RI:1;
303 unsigned int CTS:1;
304 unsigned int reserverd:4;
305 u8 port;
306 } __attribute__ ((packed));
307
308 /* This stores all control uplink flags */
309 struct ctrl_ul {
310 unsigned int DTR:1;
311 unsigned int RTS:1;
312 unsigned int reserved:6;
313 u8 port;
314 } __attribute__ ((packed));
315 #endif
316
317 /* This holds all information that is needed regarding a port */
318 struct port {
319 struct tty_port port;
320 u8 update_flow_control;
321 struct ctrl_ul ctrl_ul;
322 struct ctrl_dl ctrl_dl;
323 struct kfifo fifo_ul;
324 void __iomem *dl_addr[2];
325 u32 dl_size[2];
326 u8 toggle_dl;
327 void __iomem *ul_addr[2];
328 u32 ul_size[2];
329 u8 toggle_ul;
330 u16 token_dl;
331
332 wait_queue_head_t tty_wait;
333 struct async_icount tty_icount;
334
335 struct nozomi *dc;
336 };
337
338 /* Private data one for each card in the system */
339 struct nozomi {
340 void __iomem *base_addr;
341 unsigned long flip;
342
343 /* Pointers to registers */
344 void __iomem *reg_iir;
345 void __iomem *reg_fcr;
346 void __iomem *reg_ier;
347
348 u16 last_ier;
349 enum card_type card_type;
350 struct config_table config_table; /* Configuration table */
351 struct pci_dev *pdev;
352 struct port port[NOZOMI_MAX_PORTS];
353 u8 *send_buf;
354
355 spinlock_t spin_mutex; /* secures access to registers and tty */
356
357 unsigned int index_start;
358 enum card_state state;
359 u32 open_ttys;
360 };
361
362 /* This is a data packet that is read or written to/from card */
363 struct buffer {
364 u32 size; /* size is the length of the data buffer */
365 u8 *data;
366 } __attribute__ ((packed));
367
368 /* Global variables */
369 static const struct pci_device_id nozomi_pci_tbl[] = {
370 {PCI_DEVICE(0x1931, 0x000c)}, /* Nozomi HSDPA */
371 {},
372 };
373
374 MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
375
376 static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
377 static struct tty_driver *ntty_driver;
378
379 static const struct tty_port_operations noz_tty_port_ops;
380
381 /*
382 * find card by tty_index
383 */
384 static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
385 {
386 return tty ? ndevs[tty->index / MAX_PORT] : NULL;
387 }
388
389 static inline struct port *get_port_by_tty(const struct tty_struct *tty)
390 {
391 struct nozomi *ndev = get_dc_by_tty(tty);
392 return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
393 }
394
395 /*
396 * TODO:
397 * -Optimize
398 * -Rewrite cleaner
399 */
400
401 static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
402 u32 size_bytes)
403 {
404 u32 i = 0;
405 const u32 __iomem *ptr = mem_addr_start;
406 u16 *buf16;
407
408 if (unlikely(!ptr || !buf))
409 goto out;
410
411 /* shortcut for extremely often used cases */
412 switch (size_bytes) {
413 case 2: /* 2 bytes */
414 buf16 = (u16 *) buf;
415 *buf16 = __le16_to_cpu(readw(ptr));
416 goto out;
417 break;
418 case 4: /* 4 bytes */
419 *(buf) = __le32_to_cpu(readl(ptr));
420 goto out;
421 break;
422 }
423
424 while (i < size_bytes) {
425 if (size_bytes - i == 2) {
426 /* Handle 2 bytes in the end */
427 buf16 = (u16 *) buf;
428 *(buf16) = __le16_to_cpu(readw(ptr));
429 i += 2;
430 } else {
431 /* Read 4 bytes */
432 *(buf) = __le32_to_cpu(readl(ptr));
433 i += 4;
434 }
435 buf++;
436 ptr++;
437 }
438 out:
439 return;
440 }
441
442 /*
443 * TODO:
444 * -Optimize
445 * -Rewrite cleaner
446 */
447 static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
448 u32 size_bytes)
449 {
450 u32 i = 0;
451 u32 __iomem *ptr = mem_addr_start;
452 const u16 *buf16;
453
454 if (unlikely(!ptr || !buf))
455 return 0;
456
457 /* shortcut for extremely often used cases */
458 switch (size_bytes) {
459 case 2: /* 2 bytes */
460 buf16 = (const u16 *)buf;
461 writew(__cpu_to_le16(*buf16), ptr);
462 return 2;
463 break;
464 case 1: /*
465 * also needs to write 4 bytes in this case
466 * so falling through..
467 */
468 case 4: /* 4 bytes */
469 writel(__cpu_to_le32(*buf), ptr);
470 return 4;
471 break;
472 }
473
474 while (i < size_bytes) {
475 if (size_bytes - i == 2) {
476 /* 2 bytes */
477 buf16 = (const u16 *)buf;
478 writew(__cpu_to_le16(*buf16), ptr);
479 i += 2;
480 } else {
481 /* 4 bytes */
482 writel(__cpu_to_le32(*buf), ptr);
483 i += 4;
484 }
485 buf++;
486 ptr++;
487 }
488 return i;
489 }
490
491 /* Setup pointers to different channels and also setup buffer sizes. */
492 static void nozomi_setup_memory(struct nozomi *dc)
493 {
494 void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
495 /* The length reported is including the length field of 4 bytes,
496 * hence subtract with 4.
497 */
498 const u16 buff_offset = 4;
499
500 /* Modem port dl configuration */
501 dc->port[PORT_MDM].dl_addr[CH_A] = offset;
502 dc->port[PORT_MDM].dl_addr[CH_B] =
503 (offset += dc->config_table.dl_mdm_len1);
504 dc->port[PORT_MDM].dl_size[CH_A] =
505 dc->config_table.dl_mdm_len1 - buff_offset;
506 dc->port[PORT_MDM].dl_size[CH_B] =
507 dc->config_table.dl_mdm_len2 - buff_offset;
508
509 /* Diag port dl configuration */
510 dc->port[PORT_DIAG].dl_addr[CH_A] =
511 (offset += dc->config_table.dl_mdm_len2);
512 dc->port[PORT_DIAG].dl_size[CH_A] =
513 dc->config_table.dl_diag_len1 - buff_offset;
514 dc->port[PORT_DIAG].dl_addr[CH_B] =
515 (offset += dc->config_table.dl_diag_len1);
516 dc->port[PORT_DIAG].dl_size[CH_B] =
517 dc->config_table.dl_diag_len2 - buff_offset;
518
519 /* App1 port dl configuration */
520 dc->port[PORT_APP1].dl_addr[CH_A] =
521 (offset += dc->config_table.dl_diag_len2);
522 dc->port[PORT_APP1].dl_size[CH_A] =
523 dc->config_table.dl_app1_len - buff_offset;
524
525 /* App2 port dl configuration */
526 dc->port[PORT_APP2].dl_addr[CH_A] =
527 (offset += dc->config_table.dl_app1_len);
528 dc->port[PORT_APP2].dl_size[CH_A] =
529 dc->config_table.dl_app2_len - buff_offset;
530
531 /* Ctrl dl configuration */
532 dc->port[PORT_CTRL].dl_addr[CH_A] =
533 (offset += dc->config_table.dl_app2_len);
534 dc->port[PORT_CTRL].dl_size[CH_A] =
535 dc->config_table.dl_ctrl_len - buff_offset;
536
537 offset = dc->base_addr + dc->config_table.ul_start;
538
539 /* Modem Port ul configuration */
540 dc->port[PORT_MDM].ul_addr[CH_A] = offset;
541 dc->port[PORT_MDM].ul_size[CH_A] =
542 dc->config_table.ul_mdm_len1 - buff_offset;
543 dc->port[PORT_MDM].ul_addr[CH_B] =
544 (offset += dc->config_table.ul_mdm_len1);
545 dc->port[PORT_MDM].ul_size[CH_B] =
546 dc->config_table.ul_mdm_len2 - buff_offset;
547
548 /* Diag port ul configuration */
549 dc->port[PORT_DIAG].ul_addr[CH_A] =
550 (offset += dc->config_table.ul_mdm_len2);
551 dc->port[PORT_DIAG].ul_size[CH_A] =
552 dc->config_table.ul_diag_len - buff_offset;
553
554 /* App1 port ul configuration */
555 dc->port[PORT_APP1].ul_addr[CH_A] =
556 (offset += dc->config_table.ul_diag_len);
557 dc->port[PORT_APP1].ul_size[CH_A] =
558 dc->config_table.ul_app1_len - buff_offset;
559
560 /* App2 port ul configuration */
561 dc->port[PORT_APP2].ul_addr[CH_A] =
562 (offset += dc->config_table.ul_app1_len);
563 dc->port[PORT_APP2].ul_size[CH_A] =
564 dc->config_table.ul_app2_len - buff_offset;
565
566 /* Ctrl ul configuration */
567 dc->port[PORT_CTRL].ul_addr[CH_A] =
568 (offset += dc->config_table.ul_app2_len);
569 dc->port[PORT_CTRL].ul_size[CH_A] =
570 dc->config_table.ul_ctrl_len - buff_offset;
571 }
572
573 /* Dump config table under initalization phase */
574 #ifdef DEBUG
575 static void dump_table(const struct nozomi *dc)
576 {
577 DBG3("signature: 0x%08X", dc->config_table.signature);
578 DBG3("version: 0x%04X", dc->config_table.version);
579 DBG3("product_information: 0x%04X", \
580 dc->config_table.product_information);
581 DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
582 DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
583 DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
584 DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
585
586 DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
587 DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
588 dc->config_table.dl_mdm_len1);
589 DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
590 dc->config_table.dl_mdm_len2);
591 DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
592 dc->config_table.dl_diag_len1);
593 DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
594 dc->config_table.dl_diag_len2);
595 DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
596 dc->config_table.dl_app1_len);
597 DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
598 dc->config_table.dl_app2_len);
599 DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
600 dc->config_table.dl_ctrl_len);
601 DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
602 dc->config_table.ul_start);
603 DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
604 dc->config_table.ul_mdm_len1);
605 DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
606 dc->config_table.ul_mdm_len2);
607 DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
608 dc->config_table.ul_diag_len);
609 DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
610 dc->config_table.ul_app1_len);
611 DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
612 dc->config_table.ul_app2_len);
613 DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
614 dc->config_table.ul_ctrl_len);
615 }
616 #else
617 static inline void dump_table(const struct nozomi *dc) { }
618 #endif
619
620 /*
621 * Read configuration table from card under intalization phase
622 * Returns 1 if ok, else 0
623 */
624 static int nozomi_read_config_table(struct nozomi *dc)
625 {
626 read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
627 sizeof(struct config_table));
628
629 if (dc->config_table.signature != NOZOMI_CONFIG_MAGIC) {
630 dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
631 dc->config_table.signature, NOZOMI_CONFIG_MAGIC);
632 return 0;
633 }
634
635 if ((dc->config_table.version == 0)
636 || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
637 int i;
638 DBG1("Second phase, configuring card");
639
640 nozomi_setup_memory(dc);
641
642 dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
643 dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
644 dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
645 DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
646 dc->port[PORT_MDM].toggle_ul,
647 dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
648
649 dump_table(dc);
650
651 for (i = PORT_MDM; i < MAX_PORT; i++) {
652 memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
653 memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
654 }
655
656 /* Enable control channel */
657 dc->last_ier = dc->last_ier | CTRL_DL;
658 writew(dc->last_ier, dc->reg_ier);
659
660 dc->state = NOZOMI_STATE_ALLOCATED;
661 dev_info(&dc->pdev->dev, "Initialization OK!\n");
662 return 1;
663 }
664
665 if ((dc->config_table.version > 0)
666 && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
667 u32 offset = 0;
668 DBG1("First phase: pushing upload buffers, clearing download");
669
670 dev_info(&dc->pdev->dev, "Version of card: %d\n",
671 dc->config_table.version);
672
673 /* Here we should disable all I/O over F32. */
674 nozomi_setup_memory(dc);
675
676 /*
677 * We should send ALL channel pair tokens back along
678 * with reset token
679 */
680
681 /* push upload modem buffers */
682 write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
683 (u32 *) &offset, 4);
684 write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
685 (u32 *) &offset, 4);
686
687 writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
688
689 DBG1("First phase done");
690 }
691
692 return 1;
693 }
694
695 /* Enable uplink interrupts */
696 static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
697 {
698 static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
699
700 if (port < NOZOMI_MAX_PORTS) {
701 dc->last_ier |= mask[port];
702 writew(dc->last_ier, dc->reg_ier);
703 } else {
704 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
705 }
706 }
707
708 /* Disable uplink interrupts */
709 static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
710 {
711 static const u16 mask[] =
712 {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
713
714 if (port < NOZOMI_MAX_PORTS) {
715 dc->last_ier &= mask[port];
716 writew(dc->last_ier, dc->reg_ier);
717 } else {
718 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
719 }
720 }
721
722 /* Enable downlink interrupts */
723 static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
724 {
725 static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
726
727 if (port < NOZOMI_MAX_PORTS) {
728 dc->last_ier |= mask[port];
729 writew(dc->last_ier, dc->reg_ier);
730 } else {
731 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
732 }
733 }
734
735 /* Disable downlink interrupts */
736 static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
737 {
738 static const u16 mask[] =
739 {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
740
741 if (port < NOZOMI_MAX_PORTS) {
742 dc->last_ier &= mask[port];
743 writew(dc->last_ier, dc->reg_ier);
744 } else {
745 dev_err(&dc->pdev->dev, "Called with wrong port?\n");
746 }
747 }
748
749 /*
750 * Return 1 - send buffer to card and ack.
751 * Return 0 - don't ack, don't send buffer to card.
752 */
753 static int send_data(enum port_type index, struct nozomi *dc)
754 {
755 u32 size = 0;
756 struct port *port = &dc->port[index];
757 const u8 toggle = port->toggle_ul;
758 void __iomem *addr = port->ul_addr[toggle];
759 const u32 ul_size = port->ul_size[toggle];
760
761 /* Get data from tty and place in buf for now */
762 size = kfifo_out(&port->fifo_ul, dc->send_buf,
763 ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
764
765 if (size == 0) {
766 DBG4("No more data to send, disable link:");
767 return 0;
768 }
769
770 /* DUMP(buf, size); */
771
772 /* Write length + data */
773 write_mem32(addr, (u32 *) &size, 4);
774 write_mem32(addr + 4, (u32 *) dc->send_buf, size);
775
776 tty_port_tty_wakeup(&port->port);
777
778 return 1;
779 }
780
781 /* If all data has been read, return 1, else 0 */
782 static int receive_data(enum port_type index, struct nozomi *dc)
783 {
784 u8 buf[RECEIVE_BUF_MAX] = { 0 };
785 int size;
786 u32 offset = 4;
787 struct port *port = &dc->port[index];
788 void __iomem *addr = port->dl_addr[port->toggle_dl];
789 struct tty_struct *tty = tty_port_tty_get(&port->port);
790 int i, ret;
791
792 size = __le32_to_cpu(readl(addr));
793 /* DBG1( "%d bytes port: %d", size, index); */
794
795 if (tty && tty_throttled(tty)) {
796 DBG1("No room in tty, don't read data, don't ack interrupt, "
797 "disable interrupt");
798
799 /* disable interrupt in downlink... */
800 disable_transmit_dl(index, dc);
801 ret = 0;
802 goto put;
803 }
804
805 if (unlikely(size == 0)) {
806 dev_err(&dc->pdev->dev, "size == 0?\n");
807 ret = 1;
808 goto put;
809 }
810
811 while (size > 0) {
812 read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
813
814 if (size == 1) {
815 tty_insert_flip_char(&port->port, buf[0], TTY_NORMAL);
816 size = 0;
817 } else if (size < RECEIVE_BUF_MAX) {
818 size -= tty_insert_flip_string(&port->port,
819 (char *)buf, size);
820 } else {
821 i = tty_insert_flip_string(&port->port,
822 (char *)buf, RECEIVE_BUF_MAX);
823 size -= i;
824 offset += i;
825 }
826 }
827
828 set_bit(index, &dc->flip);
829 ret = 1;
830 put:
831 tty_kref_put(tty);
832 return ret;
833 }
834
835 /* Debug for interrupts */
836 #ifdef DEBUG
837 static char *interrupt2str(u16 interrupt)
838 {
839 static char buf[TMP_BUF_MAX];
840 char *p = buf;
841
842 interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
843 interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
844 "MDM_DL2 ") : NULL;
845
846 interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
847 "MDM_UL1 ") : NULL;
848 interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
849 "MDM_UL2 ") : NULL;
850
851 interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
852 "DIAG_DL1 ") : NULL;
853 interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
854 "DIAG_DL2 ") : NULL;
855
856 interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
857 "DIAG_UL ") : NULL;
858
859 interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
860 "APP1_DL ") : NULL;
861 interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
862 "APP2_DL ") : NULL;
863
864 interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
865 "APP1_UL ") : NULL;
866 interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
867 "APP2_UL ") : NULL;
868
869 interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
870 "CTRL_DL ") : NULL;
871 interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
872 "CTRL_UL ") : NULL;
873
874 interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
875 "RESET ") : NULL;
876
877 return buf;
878 }
879 #endif
880
881 /*
882 * Receive flow control
883 * Return 1 - If ok, else 0
884 */
885 static int receive_flow_control(struct nozomi *dc)
886 {
887 enum port_type port = PORT_MDM;
888 struct ctrl_dl ctrl_dl;
889 struct ctrl_dl old_ctrl;
890 u16 enable_ier = 0;
891
892 read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
893
894 switch (ctrl_dl.port) {
895 case CTRL_CMD:
896 DBG1("The Base Band sends this value as a response to a "
897 "request for IMSI detach sent over the control "
898 "channel uplink (see section 7.6.1).");
899 break;
900 case CTRL_MDM:
901 port = PORT_MDM;
902 enable_ier = MDM_DL;
903 break;
904 case CTRL_DIAG:
905 port = PORT_DIAG;
906 enable_ier = DIAG_DL;
907 break;
908 case CTRL_APP1:
909 port = PORT_APP1;
910 enable_ier = APP1_DL;
911 break;
912 case CTRL_APP2:
913 port = PORT_APP2;
914 enable_ier = APP2_DL;
915 if (dc->state == NOZOMI_STATE_ALLOCATED) {
916 /*
917 * After card initialization the flow control
918 * received for APP2 is always the last
919 */
920 dc->state = NOZOMI_STATE_READY;
921 dev_info(&dc->pdev->dev, "Device READY!\n");
922 }
923 break;
924 default:
925 dev_err(&dc->pdev->dev,
926 "ERROR: flow control received for non-existing port\n");
927 return 0;
928 }
929
930 DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
931 *((u16 *)&ctrl_dl));
932
933 old_ctrl = dc->port[port].ctrl_dl;
934 dc->port[port].ctrl_dl = ctrl_dl;
935
936 if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
937 DBG1("Disable interrupt (0x%04X) on port: %d",
938 enable_ier, port);
939 disable_transmit_ul(port, dc);
940
941 } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
942
943 if (kfifo_len(&dc->port[port].fifo_ul)) {
944 DBG1("Enable interrupt (0x%04X) on port: %d",
945 enable_ier, port);
946 DBG1("Data in buffer [%d], enable transmit! ",
947 kfifo_len(&dc->port[port].fifo_ul));
948 enable_transmit_ul(port, dc);
949 } else {
950 DBG1("No data in buffer...");
951 }
952 }
953
954 if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
955 DBG1(" No change in mctrl");
956 return 1;
957 }
958 /* Update statistics */
959 if (old_ctrl.CTS != ctrl_dl.CTS)
960 dc->port[port].tty_icount.cts++;
961 if (old_ctrl.DSR != ctrl_dl.DSR)
962 dc->port[port].tty_icount.dsr++;
963 if (old_ctrl.RI != ctrl_dl.RI)
964 dc->port[port].tty_icount.rng++;
965 if (old_ctrl.DCD != ctrl_dl.DCD)
966 dc->port[port].tty_icount.dcd++;
967
968 wake_up_interruptible(&dc->port[port].tty_wait);
969
970 DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
971 port,
972 dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
973 dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
974
975 return 1;
976 }
977
978 static enum ctrl_port_type port2ctrl(enum port_type port,
979 const struct nozomi *dc)
980 {
981 switch (port) {
982 case PORT_MDM:
983 return CTRL_MDM;
984 case PORT_DIAG:
985 return CTRL_DIAG;
986 case PORT_APP1:
987 return CTRL_APP1;
988 case PORT_APP2:
989 return CTRL_APP2;
990 default:
991 dev_err(&dc->pdev->dev,
992 "ERROR: send flow control " \
993 "received for non-existing port\n");
994 }
995 return CTRL_ERROR;
996 }
997
998 /*
999 * Send flow control, can only update one channel at a time
1000 * Return 0 - If we have updated all flow control
1001 * Return 1 - If we need to update more flow control, ack current enable more
1002 */
1003 static int send_flow_control(struct nozomi *dc)
1004 {
1005 u32 i, more_flow_control_to_be_updated = 0;
1006 u16 *ctrl;
1007
1008 for (i = PORT_MDM; i < MAX_PORT; i++) {
1009 if (dc->port[i].update_flow_control) {
1010 if (more_flow_control_to_be_updated) {
1011 /* We have more flow control to be updated */
1012 return 1;
1013 }
1014 dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1015 ctrl = (u16 *)&dc->port[i].ctrl_ul;
1016 write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1017 (u32 *) ctrl, 2);
1018 dc->port[i].update_flow_control = 0;
1019 more_flow_control_to_be_updated = 1;
1020 }
1021 }
1022 return 0;
1023 }
1024
1025 /*
1026 * Handle downlink data, ports that are handled are modem and diagnostics
1027 * Return 1 - ok
1028 * Return 0 - toggle fields are out of sync
1029 */
1030 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1031 u16 read_iir, u16 mask1, u16 mask2)
1032 {
1033 if (*toggle == 0 && read_iir & mask1) {
1034 if (receive_data(port, dc)) {
1035 writew(mask1, dc->reg_fcr);
1036 *toggle = !(*toggle);
1037 }
1038
1039 if (read_iir & mask2) {
1040 if (receive_data(port, dc)) {
1041 writew(mask2, dc->reg_fcr);
1042 *toggle = !(*toggle);
1043 }
1044 }
1045 } else if (*toggle == 1 && read_iir & mask2) {
1046 if (receive_data(port, dc)) {
1047 writew(mask2, dc->reg_fcr);
1048 *toggle = !(*toggle);
1049 }
1050
1051 if (read_iir & mask1) {
1052 if (receive_data(port, dc)) {
1053 writew(mask1, dc->reg_fcr);
1054 *toggle = !(*toggle);
1055 }
1056 }
1057 } else {
1058 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1059 *toggle);
1060 return 0;
1061 }
1062 return 1;
1063 }
1064
1065 /*
1066 * Handle uplink data, this is currently for the modem port
1067 * Return 1 - ok
1068 * Return 0 - toggle field are out of sync
1069 */
1070 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1071 {
1072 u8 *toggle = &(dc->port[port].toggle_ul);
1073
1074 if (*toggle == 0 && read_iir & MDM_UL1) {
1075 dc->last_ier &= ~MDM_UL;
1076 writew(dc->last_ier, dc->reg_ier);
1077 if (send_data(port, dc)) {
1078 writew(MDM_UL1, dc->reg_fcr);
1079 dc->last_ier = dc->last_ier | MDM_UL;
1080 writew(dc->last_ier, dc->reg_ier);
1081 *toggle = !*toggle;
1082 }
1083
1084 if (read_iir & MDM_UL2) {
1085 dc->last_ier &= ~MDM_UL;
1086 writew(dc->last_ier, dc->reg_ier);
1087 if (send_data(port, dc)) {
1088 writew(MDM_UL2, dc->reg_fcr);
1089 dc->last_ier = dc->last_ier | MDM_UL;
1090 writew(dc->last_ier, dc->reg_ier);
1091 *toggle = !*toggle;
1092 }
1093 }
1094
1095 } else if (*toggle == 1 && read_iir & MDM_UL2) {
1096 dc->last_ier &= ~MDM_UL;
1097 writew(dc->last_ier, dc->reg_ier);
1098 if (send_data(port, dc)) {
1099 writew(MDM_UL2, dc->reg_fcr);
1100 dc->last_ier = dc->last_ier | MDM_UL;
1101 writew(dc->last_ier, dc->reg_ier);
1102 *toggle = !*toggle;
1103 }
1104
1105 if (read_iir & MDM_UL1) {
1106 dc->last_ier &= ~MDM_UL;
1107 writew(dc->last_ier, dc->reg_ier);
1108 if (send_data(port, dc)) {
1109 writew(MDM_UL1, dc->reg_fcr);
1110 dc->last_ier = dc->last_ier | MDM_UL;
1111 writew(dc->last_ier, dc->reg_ier);
1112 *toggle = !*toggle;
1113 }
1114 }
1115 } else {
1116 writew(read_iir & MDM_UL, dc->reg_fcr);
1117 dev_err(&dc->pdev->dev, "port out of sync!\n");
1118 return 0;
1119 }
1120 return 1;
1121 }
1122
1123 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1124 {
1125 struct nozomi *dc = dev_id;
1126 unsigned int a;
1127 u16 read_iir;
1128
1129 if (!dc)
1130 return IRQ_NONE;
1131
1132 spin_lock(&dc->spin_mutex);
1133 read_iir = readw(dc->reg_iir);
1134
1135 /* Card removed */
1136 if (read_iir == (u16)-1)
1137 goto none;
1138 /*
1139 * Just handle interrupt enabled in IER
1140 * (by masking with dc->last_ier)
1141 */
1142 read_iir &= dc->last_ier;
1143
1144 if (read_iir == 0)
1145 goto none;
1146
1147
1148 DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1149 dc->last_ier);
1150
1151 if (read_iir & RESET) {
1152 if (unlikely(!nozomi_read_config_table(dc))) {
1153 dc->last_ier = 0x0;
1154 writew(dc->last_ier, dc->reg_ier);
1155 dev_err(&dc->pdev->dev, "Could not read status from "
1156 "card, we should disable interface\n");
1157 } else {
1158 writew(RESET, dc->reg_fcr);
1159 }
1160 /* No more useful info if this was the reset interrupt. */
1161 goto exit_handler;
1162 }
1163 if (read_iir & CTRL_UL) {
1164 DBG1("CTRL_UL");
1165 dc->last_ier &= ~CTRL_UL;
1166 writew(dc->last_ier, dc->reg_ier);
1167 if (send_flow_control(dc)) {
1168 writew(CTRL_UL, dc->reg_fcr);
1169 dc->last_ier = dc->last_ier | CTRL_UL;
1170 writew(dc->last_ier, dc->reg_ier);
1171 }
1172 }
1173 if (read_iir & CTRL_DL) {
1174 receive_flow_control(dc);
1175 writew(CTRL_DL, dc->reg_fcr);
1176 }
1177 if (read_iir & MDM_DL) {
1178 if (!handle_data_dl(dc, PORT_MDM,
1179 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1180 MDM_DL1, MDM_DL2)) {
1181 dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1182 goto exit_handler;
1183 }
1184 }
1185 if (read_iir & MDM_UL) {
1186 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1187 dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1188 goto exit_handler;
1189 }
1190 }
1191 if (read_iir & DIAG_DL) {
1192 if (!handle_data_dl(dc, PORT_DIAG,
1193 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1194 DIAG_DL1, DIAG_DL2)) {
1195 dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1196 goto exit_handler;
1197 }
1198 }
1199 if (read_iir & DIAG_UL) {
1200 dc->last_ier &= ~DIAG_UL;
1201 writew(dc->last_ier, dc->reg_ier);
1202 if (send_data(PORT_DIAG, dc)) {
1203 writew(DIAG_UL, dc->reg_fcr);
1204 dc->last_ier = dc->last_ier | DIAG_UL;
1205 writew(dc->last_ier, dc->reg_ier);
1206 }
1207 }
1208 if (read_iir & APP1_DL) {
1209 if (receive_data(PORT_APP1, dc))
1210 writew(APP1_DL, dc->reg_fcr);
1211 }
1212 if (read_iir & APP1_UL) {
1213 dc->last_ier &= ~APP1_UL;
1214 writew(dc->last_ier, dc->reg_ier);
1215 if (send_data(PORT_APP1, dc)) {
1216 writew(APP1_UL, dc->reg_fcr);
1217 dc->last_ier = dc->last_ier | APP1_UL;
1218 writew(dc->last_ier, dc->reg_ier);
1219 }
1220 }
1221 if (read_iir & APP2_DL) {
1222 if (receive_data(PORT_APP2, dc))
1223 writew(APP2_DL, dc->reg_fcr);
1224 }
1225 if (read_iir & APP2_UL) {
1226 dc->last_ier &= ~APP2_UL;
1227 writew(dc->last_ier, dc->reg_ier);
1228 if (send_data(PORT_APP2, dc)) {
1229 writew(APP2_UL, dc->reg_fcr);
1230 dc->last_ier = dc->last_ier | APP2_UL;
1231 writew(dc->last_ier, dc->reg_ier);
1232 }
1233 }
1234
1235 exit_handler:
1236 spin_unlock(&dc->spin_mutex);
1237
1238 for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1239 if (test_and_clear_bit(a, &dc->flip))
1240 tty_flip_buffer_push(&dc->port[a].port);
1241
1242 return IRQ_HANDLED;
1243 none:
1244 spin_unlock(&dc->spin_mutex);
1245 return IRQ_NONE;
1246 }
1247
1248 static void nozomi_get_card_type(struct nozomi *dc)
1249 {
1250 int i;
1251 u32 size = 0;
1252
1253 for (i = 0; i < 6; i++)
1254 size += pci_resource_len(dc->pdev, i);
1255
1256 /* Assume card type F32_8 if no match */
1257 dc->card_type = size == 2048 ? F32_2 : F32_8;
1258
1259 dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1260 }
1261
1262 static void nozomi_setup_private_data(struct nozomi *dc)
1263 {
1264 void __iomem *offset = dc->base_addr + dc->card_type / 2;
1265 unsigned int i;
1266
1267 dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1268 dc->reg_iir = (void __iomem *)(offset + R_IIR);
1269 dc->reg_ier = (void __iomem *)(offset + R_IER);
1270 dc->last_ier = 0;
1271 dc->flip = 0;
1272
1273 dc->port[PORT_MDM].token_dl = MDM_DL;
1274 dc->port[PORT_DIAG].token_dl = DIAG_DL;
1275 dc->port[PORT_APP1].token_dl = APP1_DL;
1276 dc->port[PORT_APP2].token_dl = APP2_DL;
1277
1278 for (i = 0; i < MAX_PORT; i++)
1279 init_waitqueue_head(&dc->port[i].tty_wait);
1280 }
1281
1282 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1283 char *buf)
1284 {
1285 const struct nozomi *dc = dev_get_drvdata(dev);
1286
1287 return sprintf(buf, "%d\n", dc->card_type);
1288 }
1289 static DEVICE_ATTR_RO(card_type);
1290
1291 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1292 char *buf)
1293 {
1294 const struct nozomi *dc = dev_get_drvdata(dev);
1295
1296 return sprintf(buf, "%u\n", dc->open_ttys);
1297 }
1298 static DEVICE_ATTR_RO(open_ttys);
1299
1300 static void make_sysfs_files(struct nozomi *dc)
1301 {
1302 if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1303 dev_err(&dc->pdev->dev,
1304 "Could not create sysfs file for card_type\n");
1305 if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1306 dev_err(&dc->pdev->dev,
1307 "Could not create sysfs file for open_ttys\n");
1308 }
1309
1310 static void remove_sysfs_files(struct nozomi *dc)
1311 {
1312 device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1313 device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1314 }
1315
1316 /* Allocate memory for one device */
1317 static int nozomi_card_init(struct pci_dev *pdev,
1318 const struct pci_device_id *ent)
1319 {
1320 int ret;
1321 struct nozomi *dc = NULL;
1322 int ndev_idx;
1323 int i;
1324
1325 dev_dbg(&pdev->dev, "Init, new card found\n");
1326
1327 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1328 if (!ndevs[ndev_idx])
1329 break;
1330
1331 if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1332 dev_err(&pdev->dev, "no free tty range for this card left\n");
1333 ret = -EIO;
1334 goto err;
1335 }
1336
1337 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1338 if (unlikely(!dc)) {
1339 dev_err(&pdev->dev, "Could not allocate memory\n");
1340 ret = -ENOMEM;
1341 goto err_free;
1342 }
1343
1344 dc->pdev = pdev;
1345
1346 ret = pci_enable_device(dc->pdev);
1347 if (ret) {
1348 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1349 goto err_free;
1350 }
1351
1352 ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1353 if (ret) {
1354 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1355 (int) /* nozomi_private.io_addr */ 0);
1356 goto err_disable_device;
1357 }
1358
1359 /* Find out what card type it is */
1360 nozomi_get_card_type(dc);
1361
1362 dc->base_addr = pci_iomap(dc->pdev, 0, dc->card_type);
1363 if (!dc->base_addr) {
1364 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1365 ret = -ENODEV;
1366 goto err_rel_regs;
1367 }
1368
1369 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1370 if (!dc->send_buf) {
1371 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1372 ret = -ENOMEM;
1373 goto err_free_sbuf;
1374 }
1375
1376 for (i = PORT_MDM; i < MAX_PORT; i++) {
1377 if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1378 GFP_KERNEL)) {
1379 dev_err(&pdev->dev,
1380 "Could not allocate kfifo buffer\n");
1381 ret = -ENOMEM;
1382 goto err_free_kfifo;
1383 }
1384 }
1385
1386 spin_lock_init(&dc->spin_mutex);
1387
1388 nozomi_setup_private_data(dc);
1389
1390 /* Disable all interrupts */
1391 dc->last_ier = 0;
1392 writew(dc->last_ier, dc->reg_ier);
1393
1394 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1395 NOZOMI_NAME, dc);
1396 if (unlikely(ret)) {
1397 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1398 goto err_free_kfifo;
1399 }
1400
1401 DBG1("base_addr: %p", dc->base_addr);
1402
1403 make_sysfs_files(dc);
1404
1405 dc->index_start = ndev_idx * MAX_PORT;
1406 ndevs[ndev_idx] = dc;
1407
1408 pci_set_drvdata(pdev, dc);
1409
1410 /* Enable RESET interrupt */
1411 dc->last_ier = RESET;
1412 iowrite16(dc->last_ier, dc->reg_ier);
1413
1414 dc->state = NOZOMI_STATE_ENABLED;
1415
1416 for (i = 0; i < MAX_PORT; i++) {
1417 struct device *tty_dev;
1418 struct port *port = &dc->port[i];
1419 port->dc = dc;
1420 tty_port_init(&port->port);
1421 port->port.ops = &noz_tty_port_ops;
1422 tty_dev = tty_port_register_device(&port->port, ntty_driver,
1423 dc->index_start + i, &pdev->dev);
1424
1425 if (IS_ERR(tty_dev)) {
1426 ret = PTR_ERR(tty_dev);
1427 dev_err(&pdev->dev, "Could not allocate tty?\n");
1428 tty_port_destroy(&port->port);
1429 goto err_free_tty;
1430 }
1431 }
1432
1433 return 0;
1434
1435 err_free_tty:
1436 for (i = 0; i < MAX_PORT; ++i) {
1437 tty_unregister_device(ntty_driver, dc->index_start + i);
1438 tty_port_destroy(&dc->port[i].port);
1439 }
1440 err_free_kfifo:
1441 for (i = 0; i < MAX_PORT; i++)
1442 kfifo_free(&dc->port[i].fifo_ul);
1443 err_free_sbuf:
1444 kfree(dc->send_buf);
1445 iounmap(dc->base_addr);
1446 err_rel_regs:
1447 pci_release_regions(pdev);
1448 err_disable_device:
1449 pci_disable_device(pdev);
1450 err_free:
1451 kfree(dc);
1452 err:
1453 return ret;
1454 }
1455
1456 static void tty_exit(struct nozomi *dc)
1457 {
1458 unsigned int i;
1459
1460 DBG1(" ");
1461
1462 for (i = 0; i < MAX_PORT; ++i)
1463 tty_port_tty_hangup(&dc->port[i].port, false);
1464
1465 /* Racy below - surely should wait for scheduled work to be done or
1466 complete off a hangup method ? */
1467 while (dc->open_ttys)
1468 msleep(1);
1469 for (i = 0; i < MAX_PORT; ++i) {
1470 tty_unregister_device(ntty_driver, dc->index_start + i);
1471 tty_port_destroy(&dc->port[i].port);
1472 }
1473 }
1474
1475 /* Deallocate memory for one device */
1476 static void nozomi_card_exit(struct pci_dev *pdev)
1477 {
1478 int i;
1479 struct ctrl_ul ctrl;
1480 struct nozomi *dc = pci_get_drvdata(pdev);
1481
1482 /* Disable all interrupts */
1483 dc->last_ier = 0;
1484 writew(dc->last_ier, dc->reg_ier);
1485
1486 tty_exit(dc);
1487
1488 /* Send 0x0001, command card to resend the reset token. */
1489 /* This is to get the reset when the module is reloaded. */
1490 ctrl.port = 0x00;
1491 ctrl.reserved = 0;
1492 ctrl.RTS = 0;
1493 ctrl.DTR = 1;
1494 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1495
1496 /* Setup dc->reg addresses to we can use defines here */
1497 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1498 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
1499
1500 remove_sysfs_files(dc);
1501
1502 free_irq(pdev->irq, dc);
1503
1504 for (i = 0; i < MAX_PORT; i++)
1505 kfifo_free(&dc->port[i].fifo_ul);
1506
1507 kfree(dc->send_buf);
1508
1509 iounmap(dc->base_addr);
1510
1511 pci_release_regions(pdev);
1512
1513 pci_disable_device(pdev);
1514
1515 ndevs[dc->index_start / MAX_PORT] = NULL;
1516
1517 kfree(dc);
1518 }
1519
1520 static void set_rts(const struct tty_struct *tty, int rts)
1521 {
1522 struct port *port = get_port_by_tty(tty);
1523
1524 port->ctrl_ul.RTS = rts;
1525 port->update_flow_control = 1;
1526 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1527 }
1528
1529 static void set_dtr(const struct tty_struct *tty, int dtr)
1530 {
1531 struct port *port = get_port_by_tty(tty);
1532
1533 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1534
1535 port->ctrl_ul.DTR = dtr;
1536 port->update_flow_control = 1;
1537 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1538 }
1539
1540 /*
1541 * ----------------------------------------------------------------------------
1542 * TTY code
1543 * ----------------------------------------------------------------------------
1544 */
1545
1546 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1547 {
1548 struct port *port = get_port_by_tty(tty);
1549 struct nozomi *dc = get_dc_by_tty(tty);
1550 int ret;
1551 if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1552 return -ENODEV;
1553 ret = tty_standard_install(driver, tty);
1554 if (ret == 0)
1555 tty->driver_data = port;
1556 return ret;
1557 }
1558
1559 static void ntty_cleanup(struct tty_struct *tty)
1560 {
1561 tty->driver_data = NULL;
1562 }
1563
1564 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1565 {
1566 struct port *port = container_of(tport, struct port, port);
1567 struct nozomi *dc = port->dc;
1568 unsigned long flags;
1569
1570 DBG1("open: %d", port->token_dl);
1571 spin_lock_irqsave(&dc->spin_mutex, flags);
1572 dc->last_ier = dc->last_ier | port->token_dl;
1573 writew(dc->last_ier, dc->reg_ier);
1574 dc->open_ttys++;
1575 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1576 printk("noz: activated %d: %p\n", tty->index, tport);
1577 return 0;
1578 }
1579
1580 static int ntty_open(struct tty_struct *tty, struct file *filp)
1581 {
1582 struct port *port = tty->driver_data;
1583 return tty_port_open(&port->port, tty, filp);
1584 }
1585
1586 static void ntty_shutdown(struct tty_port *tport)
1587 {
1588 struct port *port = container_of(tport, struct port, port);
1589 struct nozomi *dc = port->dc;
1590 unsigned long flags;
1591
1592 DBG1("close: %d", port->token_dl);
1593 spin_lock_irqsave(&dc->spin_mutex, flags);
1594 dc->last_ier &= ~(port->token_dl);
1595 writew(dc->last_ier, dc->reg_ier);
1596 dc->open_ttys--;
1597 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1598 printk("noz: shutdown %p\n", tport);
1599 }
1600
1601 static void ntty_close(struct tty_struct *tty, struct file *filp)
1602 {
1603 struct port *port = tty->driver_data;
1604 if (port)
1605 tty_port_close(&port->port, tty, filp);
1606 }
1607
1608 static void ntty_hangup(struct tty_struct *tty)
1609 {
1610 struct port *port = tty->driver_data;
1611 tty_port_hangup(&port->port);
1612 }
1613
1614 /*
1615 * called when the userspace process writes to the tty (/dev/noz*).
1616 * Data is inserted into a fifo, which is then read and transferred to the modem.
1617 */
1618 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1619 int count)
1620 {
1621 int rval = -EINVAL;
1622 struct nozomi *dc = get_dc_by_tty(tty);
1623 struct port *port = tty->driver_data;
1624 unsigned long flags;
1625
1626 /* DBG1( "WRITEx: %d, index = %d", count, index); */
1627
1628 if (!dc || !port)
1629 return -ENODEV;
1630
1631 rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1632
1633 spin_lock_irqsave(&dc->spin_mutex, flags);
1634 /* CTS is only valid on the modem channel */
1635 if (port == &(dc->port[PORT_MDM])) {
1636 if (port->ctrl_dl.CTS) {
1637 DBG4("Enable interrupt");
1638 enable_transmit_ul(tty->index % MAX_PORT, dc);
1639 } else {
1640 dev_err(&dc->pdev->dev,
1641 "CTS not active on modem port?\n");
1642 }
1643 } else {
1644 enable_transmit_ul(tty->index % MAX_PORT, dc);
1645 }
1646 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1647
1648 return rval;
1649 }
1650
1651 /*
1652 * Calculate how much is left in device
1653 * This method is called by the upper tty layer.
1654 * #according to sources N_TTY.c it expects a value >= 0 and
1655 * does not check for negative values.
1656 *
1657 * If the port is unplugged report lots of room and let the bits
1658 * dribble away so we don't block anything.
1659 */
1660 static int ntty_write_room(struct tty_struct *tty)
1661 {
1662 struct port *port = tty->driver_data;
1663 int room = 4096;
1664 const struct nozomi *dc = get_dc_by_tty(tty);
1665
1666 if (dc)
1667 room = kfifo_avail(&port->fifo_ul);
1668
1669 return room;
1670 }
1671
1672 /* Gets io control parameters */
1673 static int ntty_tiocmget(struct tty_struct *tty)
1674 {
1675 const struct port *port = tty->driver_data;
1676 const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1677 const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1678
1679 /* Note: these could change under us but it is not clear this
1680 matters if so */
1681 return (ctrl_ul->RTS ? TIOCM_RTS : 0)
1682 | (ctrl_ul->DTR ? TIOCM_DTR : 0)
1683 | (ctrl_dl->DCD ? TIOCM_CAR : 0)
1684 | (ctrl_dl->RI ? TIOCM_RNG : 0)
1685 | (ctrl_dl->DSR ? TIOCM_DSR : 0)
1686 | (ctrl_dl->CTS ? TIOCM_CTS : 0);
1687 }
1688
1689 /* Sets io controls parameters */
1690 static int ntty_tiocmset(struct tty_struct *tty,
1691 unsigned int set, unsigned int clear)
1692 {
1693 struct nozomi *dc = get_dc_by_tty(tty);
1694 unsigned long flags;
1695
1696 spin_lock_irqsave(&dc->spin_mutex, flags);
1697 if (set & TIOCM_RTS)
1698 set_rts(tty, 1);
1699 else if (clear & TIOCM_RTS)
1700 set_rts(tty, 0);
1701
1702 if (set & TIOCM_DTR)
1703 set_dtr(tty, 1);
1704 else if (clear & TIOCM_DTR)
1705 set_dtr(tty, 0);
1706 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1707
1708 return 0;
1709 }
1710
1711 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1712 struct async_icount *cprev)
1713 {
1714 const struct async_icount cnow = port->tty_icount;
1715 int ret;
1716
1717 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng))
1718 || ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr))
1719 || ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd))
1720 || ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1721
1722 *cprev = cnow;
1723
1724 return ret;
1725 }
1726
1727 static int ntty_tiocgicount(struct tty_struct *tty,
1728 struct serial_icounter_struct *icount)
1729 {
1730 struct port *port = tty->driver_data;
1731 const struct async_icount cnow = port->tty_icount;
1732
1733 icount->cts = cnow.cts;
1734 icount->dsr = cnow.dsr;
1735 icount->rng = cnow.rng;
1736 icount->dcd = cnow.dcd;
1737 icount->rx = cnow.rx;
1738 icount->tx = cnow.tx;
1739 icount->frame = cnow.frame;
1740 icount->overrun = cnow.overrun;
1741 icount->parity = cnow.parity;
1742 icount->brk = cnow.brk;
1743 icount->buf_overrun = cnow.buf_overrun;
1744 return 0;
1745 }
1746
1747 static int ntty_ioctl(struct tty_struct *tty,
1748 unsigned int cmd, unsigned long arg)
1749 {
1750 struct port *port = tty->driver_data;
1751 int rval = -ENOIOCTLCMD;
1752
1753 DBG1("******** IOCTL, cmd: %d", cmd);
1754
1755 switch (cmd) {
1756 case TIOCMIWAIT: {
1757 struct async_icount cprev = port->tty_icount;
1758
1759 rval = wait_event_interruptible(port->tty_wait,
1760 ntty_cflags_changed(port, arg, &cprev));
1761 break;
1762 }
1763 default:
1764 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1765 break;
1766 }
1767
1768 return rval;
1769 }
1770
1771 /*
1772 * Called by the upper tty layer when tty buffers are ready
1773 * to receive data again after a call to throttle.
1774 */
1775 static void ntty_unthrottle(struct tty_struct *tty)
1776 {
1777 struct nozomi *dc = get_dc_by_tty(tty);
1778 unsigned long flags;
1779
1780 DBG1("UNTHROTTLE");
1781 spin_lock_irqsave(&dc->spin_mutex, flags);
1782 enable_transmit_dl(tty->index % MAX_PORT, dc);
1783 set_rts(tty, 1);
1784
1785 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1786 }
1787
1788 /*
1789 * Called by the upper tty layer when the tty buffers are almost full.
1790 * The driver should stop send more data.
1791 */
1792 static void ntty_throttle(struct tty_struct *tty)
1793 {
1794 struct nozomi *dc = get_dc_by_tty(tty);
1795 unsigned long flags;
1796
1797 DBG1("THROTTLE");
1798 spin_lock_irqsave(&dc->spin_mutex, flags);
1799 set_rts(tty, 0);
1800 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1801 }
1802
1803 /* Returns number of chars in buffer, called by tty layer */
1804 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1805 {
1806 struct port *port = tty->driver_data;
1807 struct nozomi *dc = get_dc_by_tty(tty);
1808 s32 rval = 0;
1809
1810 if (unlikely(!dc || !port)) {
1811 goto exit_in_buffer;
1812 }
1813
1814 rval = kfifo_len(&port->fifo_ul);
1815
1816 exit_in_buffer:
1817 return rval;
1818 }
1819
1820 static const struct tty_port_operations noz_tty_port_ops = {
1821 .activate = ntty_activate,
1822 .shutdown = ntty_shutdown,
1823 };
1824
1825 static const struct tty_operations tty_ops = {
1826 .ioctl = ntty_ioctl,
1827 .open = ntty_open,
1828 .close = ntty_close,
1829 .hangup = ntty_hangup,
1830 .write = ntty_write,
1831 .write_room = ntty_write_room,
1832 .unthrottle = ntty_unthrottle,
1833 .throttle = ntty_throttle,
1834 .chars_in_buffer = ntty_chars_in_buffer,
1835 .tiocmget = ntty_tiocmget,
1836 .tiocmset = ntty_tiocmset,
1837 .get_icount = ntty_tiocgicount,
1838 .install = ntty_install,
1839 .cleanup = ntty_cleanup,
1840 };
1841
1842 /* Module initialization */
1843 static struct pci_driver nozomi_driver = {
1844 .name = NOZOMI_NAME,
1845 .id_table = nozomi_pci_tbl,
1846 .probe = nozomi_card_init,
1847 .remove = nozomi_card_exit,
1848 };
1849
1850 static __init int nozomi_init(void)
1851 {
1852 int ret;
1853
1854 printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1855
1856 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1857 if (!ntty_driver)
1858 return -ENOMEM;
1859
1860 ntty_driver->driver_name = NOZOMI_NAME_TTY;
1861 ntty_driver->name = "noz";
1862 ntty_driver->major = 0;
1863 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1864 ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1865 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1866 ntty_driver->init_termios = tty_std_termios;
1867 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1868 HUPCL | CLOCAL;
1869 ntty_driver->init_termios.c_ispeed = 115200;
1870 ntty_driver->init_termios.c_ospeed = 115200;
1871 tty_set_operations(ntty_driver, &tty_ops);
1872
1873 ret = tty_register_driver(ntty_driver);
1874 if (ret) {
1875 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1876 goto free_tty;
1877 }
1878
1879 ret = pci_register_driver(&nozomi_driver);
1880 if (ret) {
1881 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1882 goto unr_tty;
1883 }
1884
1885 return 0;
1886 unr_tty:
1887 tty_unregister_driver(ntty_driver);
1888 free_tty:
1889 put_tty_driver(ntty_driver);
1890 return ret;
1891 }
1892
1893 static __exit void nozomi_exit(void)
1894 {
1895 printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1896 pci_unregister_driver(&nozomi_driver);
1897 tty_unregister_driver(ntty_driver);
1898 put_tty_driver(ntty_driver);
1899 }
1900
1901 module_init(nozomi_init);
1902 module_exit(nozomi_exit);
1903
1904 MODULE_LICENSE("Dual BSD/GPL");
1905 MODULE_DESCRIPTION(DRIVER_DESC);
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