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serial: tegra: drop bogus NULL tty-port checks
[linux/fpc-iii.git] / drivers / tty / nozomi.c
blobd42b854cb7df2b08227ebf4cba001615a8a2a0d3
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 reserved: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 if (interrupt & MDM_DL1)
843 p += scnprintf(p, TMP_BUF_MAX, "MDM_DL1 ");
844 if (interrupt & MDM_DL2)
845 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_DL2 ");
846 if (interrupt & MDM_UL1)
847 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL1 ");
848 if (interrupt & MDM_UL2)
849 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "MDM_UL2 ");
850 if (interrupt & DIAG_DL1)
851 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL1 ");
852 if (interrupt & DIAG_DL2)
853 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_DL2 ");
854
855 if (interrupt & DIAG_UL)
856 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "DIAG_UL ");
857
858 if (interrupt & APP1_DL)
859 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_DL ");
860 if (interrupt & APP2_DL)
861 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_DL ");
862
863 if (interrupt & APP1_UL)
864 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP1_UL ");
865 if (interrupt & APP2_UL)
866 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "APP2_UL ");
867
868 if (interrupt & CTRL_DL)
869 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_DL ");
870 if (interrupt & CTRL_UL)
871 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "CTRL_UL ");
872
873 if (interrupt & RESET)
874 p += scnprintf(p, TMP_BUF_MAX - (p - buf), "RESET ");
875
876 return buf;
877 }
878 #endif
879
880 /*
881 * Receive flow control
882 * Return 1 - If ok, else 0
883 */
884 static int receive_flow_control(struct nozomi *dc)
885 {
886 enum port_type port = PORT_MDM;
887 struct ctrl_dl ctrl_dl;
888 struct ctrl_dl old_ctrl;
889 u16 enable_ier = 0;
890
891 read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
892
893 switch (ctrl_dl.port) {
894 case CTRL_CMD:
895 DBG1("The Base Band sends this value as a response to a "
896 "request for IMSI detach sent over the control "
897 "channel uplink (see section 7.6.1).");
898 break;
899 case CTRL_MDM:
900 port = PORT_MDM;
901 enable_ier = MDM_DL;
902 break;
903 case CTRL_DIAG:
904 port = PORT_DIAG;
905 enable_ier = DIAG_DL;
906 break;
907 case CTRL_APP1:
908 port = PORT_APP1;
909 enable_ier = APP1_DL;
910 break;
911 case CTRL_APP2:
912 port = PORT_APP2;
913 enable_ier = APP2_DL;
914 if (dc->state == NOZOMI_STATE_ALLOCATED) {
915 /*
916 * After card initialization the flow control
917 * received for APP2 is always the last
918 */
919 dc->state = NOZOMI_STATE_READY;
920 dev_info(&dc->pdev->dev, "Device READY!\n");
921 }
922 break;
923 default:
924 dev_err(&dc->pdev->dev,
925 "ERROR: flow control received for non-existing port\n");
926 return 0;
927 }
928
929 DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
930 *((u16 *)&ctrl_dl));
931
932 old_ctrl = dc->port[port].ctrl_dl;
933 dc->port[port].ctrl_dl = ctrl_dl;
934
935 if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
936 DBG1("Disable interrupt (0x%04X) on port: %d",
937 enable_ier, port);
938 disable_transmit_ul(port, dc);
939
940 } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
941
942 if (kfifo_len(&dc->port[port].fifo_ul)) {
943 DBG1("Enable interrupt (0x%04X) on port: %d",
944 enable_ier, port);
945 DBG1("Data in buffer [%d], enable transmit! ",
946 kfifo_len(&dc->port[port].fifo_ul));
947 enable_transmit_ul(port, dc);
948 } else {
949 DBG1("No data in buffer...");
950 }
951 }
952
953 if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
954 DBG1(" No change in mctrl");
955 return 1;
956 }
957 /* Update statistics */
958 if (old_ctrl.CTS != ctrl_dl.CTS)
959 dc->port[port].tty_icount.cts++;
960 if (old_ctrl.DSR != ctrl_dl.DSR)
961 dc->port[port].tty_icount.dsr++;
962 if (old_ctrl.RI != ctrl_dl.RI)
963 dc->port[port].tty_icount.rng++;
964 if (old_ctrl.DCD != ctrl_dl.DCD)
965 dc->port[port].tty_icount.dcd++;
966
967 wake_up_interruptible(&dc->port[port].tty_wait);
968
969 DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
970 port,
971 dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
972 dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
973
974 return 1;
975 }
976
977 static enum ctrl_port_type port2ctrl(enum port_type port,
978 const struct nozomi *dc)
979 {
980 switch (port) {
981 case PORT_MDM:
982 return CTRL_MDM;
983 case PORT_DIAG:
984 return CTRL_DIAG;
985 case PORT_APP1:
986 return CTRL_APP1;
987 case PORT_APP2:
988 return CTRL_APP2;
989 default:
990 dev_err(&dc->pdev->dev,
991 "ERROR: send flow control " \
992 "received for non-existing port\n");
993 }
994 return CTRL_ERROR;
995 }
996
997 /*
998 * Send flow control, can only update one channel at a time
999 * Return 0 - If we have updated all flow control
1000 * Return 1 - If we need to update more flow control, ack current enable more
1001 */
1002 static int send_flow_control(struct nozomi *dc)
1003 {
1004 u32 i, more_flow_control_to_be_updated = 0;
1005 u16 *ctrl;
1006
1007 for (i = PORT_MDM; i < MAX_PORT; i++) {
1008 if (dc->port[i].update_flow_control) {
1009 if (more_flow_control_to_be_updated) {
1010 /* We have more flow control to be updated */
1011 return 1;
1012 }
1013 dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
1014 ctrl = (u16 *)&dc->port[i].ctrl_ul;
1015 write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
1016 (u32 *) ctrl, 2);
1017 dc->port[i].update_flow_control = 0;
1018 more_flow_control_to_be_updated = 1;
1019 }
1020 }
1021 return 0;
1022 }
1023
1024 /*
1025 * Handle downlink data, ports that are handled are modem and diagnostics
1026 * Return 1 - ok
1027 * Return 0 - toggle fields are out of sync
1028 */
1029 static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
1030 u16 read_iir, u16 mask1, u16 mask2)
1031 {
1032 if (*toggle == 0 && read_iir & mask1) {
1033 if (receive_data(port, dc)) {
1034 writew(mask1, dc->reg_fcr);
1035 *toggle = !(*toggle);
1036 }
1037
1038 if (read_iir & mask2) {
1039 if (receive_data(port, dc)) {
1040 writew(mask2, dc->reg_fcr);
1041 *toggle = !(*toggle);
1042 }
1043 }
1044 } else if (*toggle == 1 && read_iir & mask2) {
1045 if (receive_data(port, dc)) {
1046 writew(mask2, dc->reg_fcr);
1047 *toggle = !(*toggle);
1048 }
1049
1050 if (read_iir & mask1) {
1051 if (receive_data(port, dc)) {
1052 writew(mask1, dc->reg_fcr);
1053 *toggle = !(*toggle);
1054 }
1055 }
1056 } else {
1057 dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
1058 *toggle);
1059 return 0;
1060 }
1061 return 1;
1062 }
1063
1064 /*
1065 * Handle uplink data, this is currently for the modem port
1066 * Return 1 - ok
1067 * Return 0 - toggle field are out of sync
1068 */
1069 static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
1070 {
1071 u8 *toggle = &(dc->port[port].toggle_ul);
1072
1073 if (*toggle == 0 && read_iir & MDM_UL1) {
1074 dc->last_ier &= ~MDM_UL;
1075 writew(dc->last_ier, dc->reg_ier);
1076 if (send_data(port, dc)) {
1077 writew(MDM_UL1, dc->reg_fcr);
1078 dc->last_ier = dc->last_ier | MDM_UL;
1079 writew(dc->last_ier, dc->reg_ier);
1080 *toggle = !*toggle;
1081 }
1082
1083 if (read_iir & MDM_UL2) {
1084 dc->last_ier &= ~MDM_UL;
1085 writew(dc->last_ier, dc->reg_ier);
1086 if (send_data(port, dc)) {
1087 writew(MDM_UL2, dc->reg_fcr);
1088 dc->last_ier = dc->last_ier | MDM_UL;
1089 writew(dc->last_ier, dc->reg_ier);
1090 *toggle = !*toggle;
1091 }
1092 }
1093
1094 } else if (*toggle == 1 && read_iir & MDM_UL2) {
1095 dc->last_ier &= ~MDM_UL;
1096 writew(dc->last_ier, dc->reg_ier);
1097 if (send_data(port, dc)) {
1098 writew(MDM_UL2, dc->reg_fcr);
1099 dc->last_ier = dc->last_ier | MDM_UL;
1100 writew(dc->last_ier, dc->reg_ier);
1101 *toggle = !*toggle;
1102 }
1103
1104 if (read_iir & MDM_UL1) {
1105 dc->last_ier &= ~MDM_UL;
1106 writew(dc->last_ier, dc->reg_ier);
1107 if (send_data(port, dc)) {
1108 writew(MDM_UL1, dc->reg_fcr);
1109 dc->last_ier = dc->last_ier | MDM_UL;
1110 writew(dc->last_ier, dc->reg_ier);
1111 *toggle = !*toggle;
1112 }
1113 }
1114 } else {
1115 writew(read_iir & MDM_UL, dc->reg_fcr);
1116 dev_err(&dc->pdev->dev, "port out of sync!\n");
1117 return 0;
1118 }
1119 return 1;
1120 }
1121
1122 static irqreturn_t interrupt_handler(int irq, void *dev_id)
1123 {
1124 struct nozomi *dc = dev_id;
1125 unsigned int a;
1126 u16 read_iir;
1127
1128 if (!dc)
1129 return IRQ_NONE;
1130
1131 spin_lock(&dc->spin_mutex);
1132 read_iir = readw(dc->reg_iir);
1133
1134 /* Card removed */
1135 if (read_iir == (u16)-1)
1136 goto none;
1137 /*
1138 * Just handle interrupt enabled in IER
1139 * (by masking with dc->last_ier)
1140 */
1141 read_iir &= dc->last_ier;
1142
1143 if (read_iir == 0)
1144 goto none;
1145
1146
1147 DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
1148 dc->last_ier);
1149
1150 if (read_iir & RESET) {
1151 if (unlikely(!nozomi_read_config_table(dc))) {
1152 dc->last_ier = 0x0;
1153 writew(dc->last_ier, dc->reg_ier);
1154 dev_err(&dc->pdev->dev, "Could not read status from "
1155 "card, we should disable interface\n");
1156 } else {
1157 writew(RESET, dc->reg_fcr);
1158 }
1159 /* No more useful info if this was the reset interrupt. */
1160 goto exit_handler;
1161 }
1162 if (read_iir & CTRL_UL) {
1163 DBG1("CTRL_UL");
1164 dc->last_ier &= ~CTRL_UL;
1165 writew(dc->last_ier, dc->reg_ier);
1166 if (send_flow_control(dc)) {
1167 writew(CTRL_UL, dc->reg_fcr);
1168 dc->last_ier = dc->last_ier | CTRL_UL;
1169 writew(dc->last_ier, dc->reg_ier);
1170 }
1171 }
1172 if (read_iir & CTRL_DL) {
1173 receive_flow_control(dc);
1174 writew(CTRL_DL, dc->reg_fcr);
1175 }
1176 if (read_iir & MDM_DL) {
1177 if (!handle_data_dl(dc, PORT_MDM,
1178 &(dc->port[PORT_MDM].toggle_dl), read_iir,
1179 MDM_DL1, MDM_DL2)) {
1180 dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
1181 goto exit_handler;
1182 }
1183 }
1184 if (read_iir & MDM_UL) {
1185 if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
1186 dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
1187 goto exit_handler;
1188 }
1189 }
1190 if (read_iir & DIAG_DL) {
1191 if (!handle_data_dl(dc, PORT_DIAG,
1192 &(dc->port[PORT_DIAG].toggle_dl), read_iir,
1193 DIAG_DL1, DIAG_DL2)) {
1194 dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
1195 goto exit_handler;
1196 }
1197 }
1198 if (read_iir & DIAG_UL) {
1199 dc->last_ier &= ~DIAG_UL;
1200 writew(dc->last_ier, dc->reg_ier);
1201 if (send_data(PORT_DIAG, dc)) {
1202 writew(DIAG_UL, dc->reg_fcr);
1203 dc->last_ier = dc->last_ier | DIAG_UL;
1204 writew(dc->last_ier, dc->reg_ier);
1205 }
1206 }
1207 if (read_iir & APP1_DL) {
1208 if (receive_data(PORT_APP1, dc))
1209 writew(APP1_DL, dc->reg_fcr);
1210 }
1211 if (read_iir & APP1_UL) {
1212 dc->last_ier &= ~APP1_UL;
1213 writew(dc->last_ier, dc->reg_ier);
1214 if (send_data(PORT_APP1, dc)) {
1215 writew(APP1_UL, dc->reg_fcr);
1216 dc->last_ier = dc->last_ier | APP1_UL;
1217 writew(dc->last_ier, dc->reg_ier);
1218 }
1219 }
1220 if (read_iir & APP2_DL) {
1221 if (receive_data(PORT_APP2, dc))
1222 writew(APP2_DL, dc->reg_fcr);
1223 }
1224 if (read_iir & APP2_UL) {
1225 dc->last_ier &= ~APP2_UL;
1226 writew(dc->last_ier, dc->reg_ier);
1227 if (send_data(PORT_APP2, dc)) {
1228 writew(APP2_UL, dc->reg_fcr);
1229 dc->last_ier = dc->last_ier | APP2_UL;
1230 writew(dc->last_ier, dc->reg_ier);
1231 }
1232 }
1233
1234 exit_handler:
1235 spin_unlock(&dc->spin_mutex);
1236
1237 for (a = 0; a < NOZOMI_MAX_PORTS; a++)
1238 if (test_and_clear_bit(a, &dc->flip))
1239 tty_flip_buffer_push(&dc->port[a].port);
1240
1241 return IRQ_HANDLED;
1242 none:
1243 spin_unlock(&dc->spin_mutex);
1244 return IRQ_NONE;
1245 }
1246
1247 static void nozomi_get_card_type(struct nozomi *dc)
1248 {
1249 int i;
1250 u32 size = 0;
1251
1252 for (i = 0; i < 6; i++)
1253 size += pci_resource_len(dc->pdev, i);
1254
1255 /* Assume card type F32_8 if no match */
1256 dc->card_type = size == 2048 ? F32_2 : F32_8;
1257
1258 dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
1259 }
1260
1261 static void nozomi_setup_private_data(struct nozomi *dc)
1262 {
1263 void __iomem *offset = dc->base_addr + dc->card_type / 2;
1264 unsigned int i;
1265
1266 dc->reg_fcr = (void __iomem *)(offset + R_FCR);
1267 dc->reg_iir = (void __iomem *)(offset + R_IIR);
1268 dc->reg_ier = (void __iomem *)(offset + R_IER);
1269 dc->last_ier = 0;
1270 dc->flip = 0;
1271
1272 dc->port[PORT_MDM].token_dl = MDM_DL;
1273 dc->port[PORT_DIAG].token_dl = DIAG_DL;
1274 dc->port[PORT_APP1].token_dl = APP1_DL;
1275 dc->port[PORT_APP2].token_dl = APP2_DL;
1276
1277 for (i = 0; i < MAX_PORT; i++)
1278 init_waitqueue_head(&dc->port[i].tty_wait);
1279 }
1280
1281 static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
1282 char *buf)
1283 {
1284 const struct nozomi *dc = dev_get_drvdata(dev);
1285
1286 return sprintf(buf, "%d\n", dc->card_type);
1287 }
1288 static DEVICE_ATTR_RO(card_type);
1289
1290 static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
1291 char *buf)
1292 {
1293 const struct nozomi *dc = dev_get_drvdata(dev);
1294
1295 return sprintf(buf, "%u\n", dc->open_ttys);
1296 }
1297 static DEVICE_ATTR_RO(open_ttys);
1298
1299 static void make_sysfs_files(struct nozomi *dc)
1300 {
1301 if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
1302 dev_err(&dc->pdev->dev,
1303 "Could not create sysfs file for card_type\n");
1304 if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
1305 dev_err(&dc->pdev->dev,
1306 "Could not create sysfs file for open_ttys\n");
1307 }
1308
1309 static void remove_sysfs_files(struct nozomi *dc)
1310 {
1311 device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
1312 device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
1313 }
1314
1315 /* Allocate memory for one device */
1316 static int nozomi_card_init(struct pci_dev *pdev,
1317 const struct pci_device_id *ent)
1318 {
1319 int ret;
1320 struct nozomi *dc = NULL;
1321 int ndev_idx;
1322 int i;
1323
1324 dev_dbg(&pdev->dev, "Init, new card found\n");
1325
1326 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1327 if (!ndevs[ndev_idx])
1328 break;
1329
1330 if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1331 dev_err(&pdev->dev, "no free tty range for this card left\n");
1332 ret = -EIO;
1333 goto err;
1334 }
1335
1336 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1337 if (unlikely(!dc)) {
1338 dev_err(&pdev->dev, "Could not allocate memory\n");
1339 ret = -ENOMEM;
1340 goto err_free;
1341 }
1342
1343 dc->pdev = pdev;
1344
1345 ret = pci_enable_device(dc->pdev);
1346 if (ret) {
1347 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1348 goto err_free;
1349 }
1350
1351 ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1352 if (ret) {
1353 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1354 (int) /* nozomi_private.io_addr */ 0);
1355 goto err_disable_device;
1356 }
1357
1358 /* Find out what card type it is */
1359 nozomi_get_card_type(dc);
1360
1361 dc->base_addr = pci_iomap(dc->pdev, 0, dc->card_type);
1362 if (!dc->base_addr) {
1363 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1364 ret = -ENODEV;
1365 goto err_rel_regs;
1366 }
1367
1368 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1369 if (!dc->send_buf) {
1370 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1371 ret = -ENOMEM;
1372 goto err_free_sbuf;
1373 }
1374
1375 for (i = PORT_MDM; i < MAX_PORT; i++) {
1376 if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1377 GFP_KERNEL)) {
1378 dev_err(&pdev->dev,
1379 "Could not allocate kfifo buffer\n");
1380 ret = -ENOMEM;
1381 goto err_free_kfifo;
1382 }
1383 }
1384
1385 spin_lock_init(&dc->spin_mutex);
1386
1387 nozomi_setup_private_data(dc);
1388
1389 /* Disable all interrupts */
1390 dc->last_ier = 0;
1391 writew(dc->last_ier, dc->reg_ier);
1392
1393 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1394 NOZOMI_NAME, dc);
1395 if (unlikely(ret)) {
1396 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1397 goto err_free_kfifo;
1398 }
1399
1400 DBG1("base_addr: %p", dc->base_addr);
1401
1402 make_sysfs_files(dc);
1403
1404 dc->index_start = ndev_idx * MAX_PORT;
1405 ndevs[ndev_idx] = dc;
1406
1407 pci_set_drvdata(pdev, dc);
1408
1409 /* Enable RESET interrupt */
1410 dc->last_ier = RESET;
1411 iowrite16(dc->last_ier, dc->reg_ier);
1412
1413 dc->state = NOZOMI_STATE_ENABLED;
1414
1415 for (i = 0; i < MAX_PORT; i++) {
1416 struct device *tty_dev;
1417 struct port *port = &dc->port[i];
1418 port->dc = dc;
1419 tty_port_init(&port->port);
1420 port->port.ops = &noz_tty_port_ops;
1421 tty_dev = tty_port_register_device(&port->port, ntty_driver,
1422 dc->index_start + i, &pdev->dev);
1423
1424 if (IS_ERR(tty_dev)) {
1425 ret = PTR_ERR(tty_dev);
1426 dev_err(&pdev->dev, "Could not allocate tty?\n");
1427 tty_port_destroy(&port->port);
1428 goto err_free_tty;
1429 }
1430 }
1431
1432 return 0;
1433
1434 err_free_tty:
1435 for (i = 0; i < MAX_PORT; ++i) {
1436 tty_unregister_device(ntty_driver, dc->index_start + i);
1437 tty_port_destroy(&dc->port[i].port);
1438 }
1439 err_free_kfifo:
1440 for (i = 0; i < MAX_PORT; i++)
1441 kfifo_free(&dc->port[i].fifo_ul);
1442 err_free_sbuf:
1443 kfree(dc->send_buf);
1444 iounmap(dc->base_addr);
1445 err_rel_regs:
1446 pci_release_regions(pdev);
1447 err_disable_device:
1448 pci_disable_device(pdev);
1449 err_free:
1450 kfree(dc);
1451 err:
1452 return ret;
1453 }
1454
1455 static void tty_exit(struct nozomi *dc)
1456 {
1457 unsigned int i;
1458
1459 DBG1(" ");
1460
1461 for (i = 0; i < MAX_PORT; ++i)
1462 tty_port_tty_hangup(&dc->port[i].port, false);
1463
1464 /* Racy below - surely should wait for scheduled work to be done or
1465 complete off a hangup method ? */
1466 while (dc->open_ttys)
1467 msleep(1);
1468 for (i = 0; i < MAX_PORT; ++i) {
1469 tty_unregister_device(ntty_driver, dc->index_start + i);
1470 tty_port_destroy(&dc->port[i].port);
1471 }
1472 }
1473
1474 /* Deallocate memory for one device */
1475 static void nozomi_card_exit(struct pci_dev *pdev)
1476 {
1477 int i;
1478 struct ctrl_ul ctrl;
1479 struct nozomi *dc = pci_get_drvdata(pdev);
1480
1481 /* Disable all interrupts */
1482 dc->last_ier = 0;
1483 writew(dc->last_ier, dc->reg_ier);
1484
1485 tty_exit(dc);
1486
1487 /* Send 0x0001, command card to resend the reset token. */
1488 /* This is to get the reset when the module is reloaded. */
1489 ctrl.port = 0x00;
1490 ctrl.reserved = 0;
1491 ctrl.RTS = 0;
1492 ctrl.DTR = 1;
1493 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1494
1495 /* Setup dc->reg addresses to we can use defines here */
1496 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1497 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
1498
1499 remove_sysfs_files(dc);
1500
1501 free_irq(pdev->irq, dc);
1502
1503 for (i = 0; i < MAX_PORT; i++)
1504 kfifo_free(&dc->port[i].fifo_ul);
1505
1506 kfree(dc->send_buf);
1507
1508 iounmap(dc->base_addr);
1509
1510 pci_release_regions(pdev);
1511
1512 pci_disable_device(pdev);
1513
1514 ndevs[dc->index_start / MAX_PORT] = NULL;
1515
1516 kfree(dc);
1517 }
1518
1519 static void set_rts(const struct tty_struct *tty, int rts)
1520 {
1521 struct port *port = get_port_by_tty(tty);
1522
1523 port->ctrl_ul.RTS = rts;
1524 port->update_flow_control = 1;
1525 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1526 }
1527
1528 static void set_dtr(const struct tty_struct *tty, int dtr)
1529 {
1530 struct port *port = get_port_by_tty(tty);
1531
1532 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1533
1534 port->ctrl_ul.DTR = dtr;
1535 port->update_flow_control = 1;
1536 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1537 }
1538
1539 /*
1540 * ----------------------------------------------------------------------------
1541 * TTY code
1542 * ----------------------------------------------------------------------------
1543 */
1544
1545 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1546 {
1547 struct port *port = get_port_by_tty(tty);
1548 struct nozomi *dc = get_dc_by_tty(tty);
1549 int ret;
1550 if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1551 return -ENODEV;
1552 ret = tty_standard_install(driver, tty);
1553 if (ret == 0)
1554 tty->driver_data = port;
1555 return ret;
1556 }
1557
1558 static void ntty_cleanup(struct tty_struct *tty)
1559 {
1560 tty->driver_data = NULL;
1561 }
1562
1563 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1564 {
1565 struct port *port = container_of(tport, struct port, port);
1566 struct nozomi *dc = port->dc;
1567 unsigned long flags;
1568
1569 DBG1("open: %d", port->token_dl);
1570 spin_lock_irqsave(&dc->spin_mutex, flags);
1571 dc->last_ier = dc->last_ier | port->token_dl;
1572 writew(dc->last_ier, dc->reg_ier);
1573 dc->open_ttys++;
1574 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1575 printk("noz: activated %d: %p\n", tty->index, tport);
1576 return 0;
1577 }
1578
1579 static int ntty_open(struct tty_struct *tty, struct file *filp)
1580 {
1581 struct port *port = tty->driver_data;
1582 return tty_port_open(&port->port, tty, filp);
1583 }
1584
1585 static void ntty_shutdown(struct tty_port *tport)
1586 {
1587 struct port *port = container_of(tport, struct port, port);
1588 struct nozomi *dc = port->dc;
1589 unsigned long flags;
1590
1591 DBG1("close: %d", port->token_dl);
1592 spin_lock_irqsave(&dc->spin_mutex, flags);
1593 dc->last_ier &= ~(port->token_dl);
1594 writew(dc->last_ier, dc->reg_ier);
1595 dc->open_ttys--;
1596 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1597 printk("noz: shutdown %p\n", tport);
1598 }
1599
1600 static void ntty_close(struct tty_struct *tty, struct file *filp)
1601 {
1602 struct port *port = tty->driver_data;
1603 if (port)
1604 tty_port_close(&port->port, tty, filp);
1605 }
1606
1607 static void ntty_hangup(struct tty_struct *tty)
1608 {
1609 struct port *port = tty->driver_data;
1610 tty_port_hangup(&port->port);
1611 }
1612
1613 /*
1614 * called when the userspace process writes to the tty (/dev/noz*).
1615 * Data is inserted into a fifo, which is then read and transferred to the modem.
1616 */
1617 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1618 int count)
1619 {
1620 int rval = -EINVAL;
1621 struct nozomi *dc = get_dc_by_tty(tty);
1622 struct port *port = tty->driver_data;
1623 unsigned long flags;
1624
1625 /* DBG1( "WRITEx: %d, index = %d", count, index); */
1626
1627 if (!dc || !port)
1628 return -ENODEV;
1629
1630 rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1631
1632 spin_lock_irqsave(&dc->spin_mutex, flags);
1633 /* CTS is only valid on the modem channel */
1634 if (port == &(dc->port[PORT_MDM])) {
1635 if (port->ctrl_dl.CTS) {
1636 DBG4("Enable interrupt");
1637 enable_transmit_ul(tty->index % MAX_PORT, dc);
1638 } else {
1639 dev_err(&dc->pdev->dev,
1640 "CTS not active on modem port?\n");
1641 }
1642 } else {
1643 enable_transmit_ul(tty->index % MAX_PORT, dc);
1644 }
1645 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1646
1647 return rval;
1648 }
1649
1650 /*
1651 * Calculate how much is left in device
1652 * This method is called by the upper tty layer.
1653 * #according to sources N_TTY.c it expects a value >= 0 and
1654 * does not check for negative values.
1655 *
1656 * If the port is unplugged report lots of room and let the bits
1657 * dribble away so we don't block anything.
1658 */
1659 static int ntty_write_room(struct tty_struct *tty)
1660 {
1661 struct port *port = tty->driver_data;
1662 int room = 4096;
1663 const struct nozomi *dc = get_dc_by_tty(tty);
1664
1665 if (dc)
1666 room = kfifo_avail(&port->fifo_ul);
1667
1668 return room;
1669 }
1670
1671 /* Gets io control parameters */
1672 static int ntty_tiocmget(struct tty_struct *tty)
1673 {
1674 const struct port *port = tty->driver_data;
1675 const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1676 const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1677
1678 /* Note: these could change under us but it is not clear this
1679 matters if so */
1680 return (ctrl_ul->RTS ? TIOCM_RTS : 0)
1681 | (ctrl_ul->DTR ? TIOCM_DTR : 0)
1682 | (ctrl_dl->DCD ? TIOCM_CAR : 0)
1683 | (ctrl_dl->RI ? TIOCM_RNG : 0)
1684 | (ctrl_dl->DSR ? TIOCM_DSR : 0)
1685 | (ctrl_dl->CTS ? TIOCM_CTS : 0);
1686 }
1687
1688 /* Sets io controls parameters */
1689 static int ntty_tiocmset(struct tty_struct *tty,
1690 unsigned int set, unsigned int clear)
1691 {
1692 struct nozomi *dc = get_dc_by_tty(tty);
1693 unsigned long flags;
1694
1695 spin_lock_irqsave(&dc->spin_mutex, flags);
1696 if (set & TIOCM_RTS)
1697 set_rts(tty, 1);
1698 else if (clear & TIOCM_RTS)
1699 set_rts(tty, 0);
1700
1701 if (set & TIOCM_DTR)
1702 set_dtr(tty, 1);
1703 else if (clear & TIOCM_DTR)
1704 set_dtr(tty, 0);
1705 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1706
1707 return 0;
1708 }
1709
1710 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1711 struct async_icount *cprev)
1712 {
1713 const struct async_icount cnow = port->tty_icount;
1714 int ret;
1715
1716 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng))
1717 || ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr))
1718 || ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd))
1719 || ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1720
1721 *cprev = cnow;
1722
1723 return ret;
1724 }
1725
1726 static int ntty_tiocgicount(struct tty_struct *tty,
1727 struct serial_icounter_struct *icount)
1728 {
1729 struct port *port = tty->driver_data;
1730 const struct async_icount cnow = port->tty_icount;
1731
1732 icount->cts = cnow.cts;
1733 icount->dsr = cnow.dsr;
1734 icount->rng = cnow.rng;
1735 icount->dcd = cnow.dcd;
1736 icount->rx = cnow.rx;
1737 icount->tx = cnow.tx;
1738 icount->frame = cnow.frame;
1739 icount->overrun = cnow.overrun;
1740 icount->parity = cnow.parity;
1741 icount->brk = cnow.brk;
1742 icount->buf_overrun = cnow.buf_overrun;
1743 return 0;
1744 }
1745
1746 static int ntty_ioctl(struct tty_struct *tty,
1747 unsigned int cmd, unsigned long arg)
1748 {
1749 struct port *port = tty->driver_data;
1750 int rval = -ENOIOCTLCMD;
1751
1752 DBG1("******** IOCTL, cmd: %d", cmd);
1753
1754 switch (cmd) {
1755 case TIOCMIWAIT: {
1756 struct async_icount cprev = port->tty_icount;
1757
1758 rval = wait_event_interruptible(port->tty_wait,
1759 ntty_cflags_changed(port, arg, &cprev));
1760 break;
1761 }
1762 default:
1763 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1764 break;
1765 }
1766
1767 return rval;
1768 }
1769
1770 /*
1771 * Called by the upper tty layer when tty buffers are ready
1772 * to receive data again after a call to throttle.
1773 */
1774 static void ntty_unthrottle(struct tty_struct *tty)
1775 {
1776 struct nozomi *dc = get_dc_by_tty(tty);
1777 unsigned long flags;
1778
1779 DBG1("UNTHROTTLE");
1780 spin_lock_irqsave(&dc->spin_mutex, flags);
1781 enable_transmit_dl(tty->index % MAX_PORT, dc);
1782 set_rts(tty, 1);
1783
1784 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1785 }
1786
1787 /*
1788 * Called by the upper tty layer when the tty buffers are almost full.
1789 * The driver should stop send more data.
1790 */
1791 static void ntty_throttle(struct tty_struct *tty)
1792 {
1793 struct nozomi *dc = get_dc_by_tty(tty);
1794 unsigned long flags;
1795
1796 DBG1("THROTTLE");
1797 spin_lock_irqsave(&dc->spin_mutex, flags);
1798 set_rts(tty, 0);
1799 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1800 }
1801
1802 /* Returns number of chars in buffer, called by tty layer */
1803 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1804 {
1805 struct port *port = tty->driver_data;
1806 struct nozomi *dc = get_dc_by_tty(tty);
1807 s32 rval = 0;
1808
1809 if (unlikely(!dc || !port)) {
1810 goto exit_in_buffer;
1811 }
1812
1813 rval = kfifo_len(&port->fifo_ul);
1814
1815 exit_in_buffer:
1816 return rval;
1817 }
1818
1819 static const struct tty_port_operations noz_tty_port_ops = {
1820 .activate = ntty_activate,
1821 .shutdown = ntty_shutdown,
1822 };
1823
1824 static const struct tty_operations tty_ops = {
1825 .ioctl = ntty_ioctl,
1826 .open = ntty_open,
1827 .close = ntty_close,
1828 .hangup = ntty_hangup,
1829 .write = ntty_write,
1830 .write_room = ntty_write_room,
1831 .unthrottle = ntty_unthrottle,
1832 .throttle = ntty_throttle,
1833 .chars_in_buffer = ntty_chars_in_buffer,
1834 .tiocmget = ntty_tiocmget,
1835 .tiocmset = ntty_tiocmset,
1836 .get_icount = ntty_tiocgicount,
1837 .install = ntty_install,
1838 .cleanup = ntty_cleanup,
1839 };
1840
1841 /* Module initialization */
1842 static struct pci_driver nozomi_driver = {
1843 .name = NOZOMI_NAME,
1844 .id_table = nozomi_pci_tbl,
1845 .probe = nozomi_card_init,
1846 .remove = nozomi_card_exit,
1847 };
1848
1849 static __init int nozomi_init(void)
1850 {
1851 int ret;
1852
1853 printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1854
1855 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1856 if (!ntty_driver)
1857 return -ENOMEM;
1858
1859 ntty_driver->driver_name = NOZOMI_NAME_TTY;
1860 ntty_driver->name = "noz";
1861 ntty_driver->major = 0;
1862 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1863 ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1864 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1865 ntty_driver->init_termios = tty_std_termios;
1866 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1867 HUPCL | CLOCAL;
1868 ntty_driver->init_termios.c_ispeed = 115200;
1869 ntty_driver->init_termios.c_ospeed = 115200;
1870 tty_set_operations(ntty_driver, &tty_ops);
1871
1872 ret = tty_register_driver(ntty_driver);
1873 if (ret) {
1874 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1875 goto free_tty;
1876 }
1877
1878 ret = pci_register_driver(&nozomi_driver);
1879 if (ret) {
1880 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1881 goto unr_tty;
1882 }
1883
1884 return 0;
1885 unr_tty:
1886 tty_unregister_driver(ntty_driver);
1887 free_tty:
1888 put_tty_driver(ntty_driver);
1889 return ret;
1890 }
1891
1892 static __exit void nozomi_exit(void)
1893 {
1894 printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1895 pci_unregister_driver(&nozomi_driver);
1896 tty_unregister_driver(ntty_driver);
1897 put_tty_driver(ntty_driver);
1898 }
1899
1900 module_init(nozomi_init);
1901 module_exit(nozomi_exit);
1902
1903 MODULE_LICENSE("Dual BSD/GPL");
1904 MODULE_DESCRIPTION(DRIVER_DESC);
Linux with added FPC-III support