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[mirror_ubuntu-bionic-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 snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
80 if (tbuf[len__-2] == '\r') {\
81 tbuf[len__-2] = 'r';\
82 } \
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_UKNOWN = 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 = pci_get_drvdata(to_pci_dev(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 = pci_get_drvdata(to_pci_dev(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 resource_size_t start;
1321 int ret;
1322 struct nozomi *dc = NULL;
1323 int ndev_idx;
1324 int i;
1325
1326 dev_dbg(&pdev->dev, "Init, new card found\n");
1327
1328 for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
1329 if (!ndevs[ndev_idx])
1330 break;
1331
1332 if (ndev_idx >= ARRAY_SIZE(ndevs)) {
1333 dev_err(&pdev->dev, "no free tty range for this card left\n");
1334 ret = -EIO;
1335 goto err;
1336 }
1337
1338 dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
1339 if (unlikely(!dc)) {
1340 dev_err(&pdev->dev, "Could not allocate memory\n");
1341 ret = -ENOMEM;
1342 goto err_free;
1343 }
1344
1345 dc->pdev = pdev;
1346
1347 ret = pci_enable_device(dc->pdev);
1348 if (ret) {
1349 dev_err(&pdev->dev, "Failed to enable PCI Device\n");
1350 goto err_free;
1351 }
1352
1353 ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
1354 if (ret) {
1355 dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
1356 (int) /* nozomi_private.io_addr */ 0);
1357 goto err_disable_device;
1358 }
1359
1360 start = pci_resource_start(dc->pdev, 0);
1361 if (start == 0) {
1362 dev_err(&pdev->dev, "No I/O address for card detected\n");
1363 ret = -ENODEV;
1364 goto err_rel_regs;
1365 }
1366
1367 /* Find out what card type it is */
1368 nozomi_get_card_type(dc);
1369
1370 dc->base_addr = ioremap_nocache(start, dc->card_type);
1371 if (!dc->base_addr) {
1372 dev_err(&pdev->dev, "Unable to map card MMIO\n");
1373 ret = -ENODEV;
1374 goto err_rel_regs;
1375 }
1376
1377 dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
1378 if (!dc->send_buf) {
1379 dev_err(&pdev->dev, "Could not allocate send buffer?\n");
1380 ret = -ENOMEM;
1381 goto err_free_sbuf;
1382 }
1383
1384 for (i = PORT_MDM; i < MAX_PORT; i++) {
1385 if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
1386 GFP_KERNEL)) {
1387 dev_err(&pdev->dev,
1388 "Could not allocate kfifo buffer\n");
1389 ret = -ENOMEM;
1390 goto err_free_kfifo;
1391 }
1392 }
1393
1394 spin_lock_init(&dc->spin_mutex);
1395
1396 nozomi_setup_private_data(dc);
1397
1398 /* Disable all interrupts */
1399 dc->last_ier = 0;
1400 writew(dc->last_ier, dc->reg_ier);
1401
1402 ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
1403 NOZOMI_NAME, dc);
1404 if (unlikely(ret)) {
1405 dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
1406 goto err_free_kfifo;
1407 }
1408
1409 DBG1("base_addr: %p", dc->base_addr);
1410
1411 make_sysfs_files(dc);
1412
1413 dc->index_start = ndev_idx * MAX_PORT;
1414 ndevs[ndev_idx] = dc;
1415
1416 pci_set_drvdata(pdev, dc);
1417
1418 /* Enable RESET interrupt */
1419 dc->last_ier = RESET;
1420 iowrite16(dc->last_ier, dc->reg_ier);
1421
1422 dc->state = NOZOMI_STATE_ENABLED;
1423
1424 for (i = 0; i < MAX_PORT; i++) {
1425 struct device *tty_dev;
1426 struct port *port = &dc->port[i];
1427 port->dc = dc;
1428 tty_port_init(&port->port);
1429 port->port.ops = &noz_tty_port_ops;
1430 tty_dev = tty_port_register_device(&port->port, ntty_driver,
1431 dc->index_start + i, &pdev->dev);
1432
1433 if (IS_ERR(tty_dev)) {
1434 ret = PTR_ERR(tty_dev);
1435 dev_err(&pdev->dev, "Could not allocate tty?\n");
1436 tty_port_destroy(&port->port);
1437 goto err_free_tty;
1438 }
1439 }
1440
1441 return 0;
1442
1443 err_free_tty:
1444 for (i = 0; i < MAX_PORT; ++i) {
1445 tty_unregister_device(ntty_driver, dc->index_start + i);
1446 tty_port_destroy(&dc->port[i].port);
1447 }
1448 err_free_kfifo:
1449 for (i = 0; i < MAX_PORT; i++)
1450 kfifo_free(&dc->port[i].fifo_ul);
1451 err_free_sbuf:
1452 kfree(dc->send_buf);
1453 iounmap(dc->base_addr);
1454 err_rel_regs:
1455 pci_release_regions(pdev);
1456 err_disable_device:
1457 pci_disable_device(pdev);
1458 err_free:
1459 kfree(dc);
1460 err:
1461 return ret;
1462 }
1463
1464 static void tty_exit(struct nozomi *dc)
1465 {
1466 unsigned int i;
1467
1468 DBG1(" ");
1469
1470 for (i = 0; i < MAX_PORT; ++i)
1471 tty_port_tty_hangup(&dc->port[i].port, false);
1472
1473 /* Racy below - surely should wait for scheduled work to be done or
1474 complete off a hangup method ? */
1475 while (dc->open_ttys)
1476 msleep(1);
1477 for (i = 0; i < MAX_PORT; ++i) {
1478 tty_unregister_device(ntty_driver, dc->index_start + i);
1479 tty_port_destroy(&dc->port[i].port);
1480 }
1481 }
1482
1483 /* Deallocate memory for one device */
1484 static void nozomi_card_exit(struct pci_dev *pdev)
1485 {
1486 int i;
1487 struct ctrl_ul ctrl;
1488 struct nozomi *dc = pci_get_drvdata(pdev);
1489
1490 /* Disable all interrupts */
1491 dc->last_ier = 0;
1492 writew(dc->last_ier, dc->reg_ier);
1493
1494 tty_exit(dc);
1495
1496 /* Send 0x0001, command card to resend the reset token. */
1497 /* This is to get the reset when the module is reloaded. */
1498 ctrl.port = 0x00;
1499 ctrl.reserved = 0;
1500 ctrl.RTS = 0;
1501 ctrl.DTR = 1;
1502 DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
1503
1504 /* Setup dc->reg addresses to we can use defines here */
1505 write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
1506 writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
1507
1508 remove_sysfs_files(dc);
1509
1510 free_irq(pdev->irq, dc);
1511
1512 for (i = 0; i < MAX_PORT; i++)
1513 kfifo_free(&dc->port[i].fifo_ul);
1514
1515 kfree(dc->send_buf);
1516
1517 iounmap(dc->base_addr);
1518
1519 pci_release_regions(pdev);
1520
1521 pci_disable_device(pdev);
1522
1523 ndevs[dc->index_start / MAX_PORT] = NULL;
1524
1525 kfree(dc);
1526 }
1527
1528 static void set_rts(const struct tty_struct *tty, int rts)
1529 {
1530 struct port *port = get_port_by_tty(tty);
1531
1532 port->ctrl_ul.RTS = rts;
1533 port->update_flow_control = 1;
1534 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1535 }
1536
1537 static void set_dtr(const struct tty_struct *tty, int dtr)
1538 {
1539 struct port *port = get_port_by_tty(tty);
1540
1541 DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
1542
1543 port->ctrl_ul.DTR = dtr;
1544 port->update_flow_control = 1;
1545 enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
1546 }
1547
1548 /*
1549 * ----------------------------------------------------------------------------
1550 * TTY code
1551 * ----------------------------------------------------------------------------
1552 */
1553
1554 static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
1555 {
1556 struct port *port = get_port_by_tty(tty);
1557 struct nozomi *dc = get_dc_by_tty(tty);
1558 int ret;
1559 if (!port || !dc || dc->state != NOZOMI_STATE_READY)
1560 return -ENODEV;
1561 ret = tty_standard_install(driver, tty);
1562 if (ret == 0)
1563 tty->driver_data = port;
1564 return ret;
1565 }
1566
1567 static void ntty_cleanup(struct tty_struct *tty)
1568 {
1569 tty->driver_data = NULL;
1570 }
1571
1572 static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
1573 {
1574 struct port *port = container_of(tport, struct port, port);
1575 struct nozomi *dc = port->dc;
1576 unsigned long flags;
1577
1578 DBG1("open: %d", port->token_dl);
1579 spin_lock_irqsave(&dc->spin_mutex, flags);
1580 dc->last_ier = dc->last_ier | port->token_dl;
1581 writew(dc->last_ier, dc->reg_ier);
1582 dc->open_ttys++;
1583 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1584 printk("noz: activated %d: %p\n", tty->index, tport);
1585 return 0;
1586 }
1587
1588 static int ntty_open(struct tty_struct *tty, struct file *filp)
1589 {
1590 struct port *port = tty->driver_data;
1591 return tty_port_open(&port->port, tty, filp);
1592 }
1593
1594 static void ntty_shutdown(struct tty_port *tport)
1595 {
1596 struct port *port = container_of(tport, struct port, port);
1597 struct nozomi *dc = port->dc;
1598 unsigned long flags;
1599
1600 DBG1("close: %d", port->token_dl);
1601 spin_lock_irqsave(&dc->spin_mutex, flags);
1602 dc->last_ier &= ~(port->token_dl);
1603 writew(dc->last_ier, dc->reg_ier);
1604 dc->open_ttys--;
1605 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1606 printk("noz: shutdown %p\n", tport);
1607 }
1608
1609 static void ntty_close(struct tty_struct *tty, struct file *filp)
1610 {
1611 struct port *port = tty->driver_data;
1612 if (port)
1613 tty_port_close(&port->port, tty, filp);
1614 }
1615
1616 static void ntty_hangup(struct tty_struct *tty)
1617 {
1618 struct port *port = tty->driver_data;
1619 tty_port_hangup(&port->port);
1620 }
1621
1622 /*
1623 * called when the userspace process writes to the tty (/dev/noz*).
1624 * Data is inserted into a fifo, which is then read and transferred to the modem.
1625 */
1626 static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
1627 int count)
1628 {
1629 int rval = -EINVAL;
1630 struct nozomi *dc = get_dc_by_tty(tty);
1631 struct port *port = tty->driver_data;
1632 unsigned long flags;
1633
1634 /* DBG1( "WRITEx: %d, index = %d", count, index); */
1635
1636 if (!dc || !port)
1637 return -ENODEV;
1638
1639 rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
1640
1641 spin_lock_irqsave(&dc->spin_mutex, flags);
1642 /* CTS is only valid on the modem channel */
1643 if (port == &(dc->port[PORT_MDM])) {
1644 if (port->ctrl_dl.CTS) {
1645 DBG4("Enable interrupt");
1646 enable_transmit_ul(tty->index % MAX_PORT, dc);
1647 } else {
1648 dev_err(&dc->pdev->dev,
1649 "CTS not active on modem port?\n");
1650 }
1651 } else {
1652 enable_transmit_ul(tty->index % MAX_PORT, dc);
1653 }
1654 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1655
1656 return rval;
1657 }
1658
1659 /*
1660 * Calculate how much is left in device
1661 * This method is called by the upper tty layer.
1662 * #according to sources N_TTY.c it expects a value >= 0 and
1663 * does not check for negative values.
1664 *
1665 * If the port is unplugged report lots of room and let the bits
1666 * dribble away so we don't block anything.
1667 */
1668 static int ntty_write_room(struct tty_struct *tty)
1669 {
1670 struct port *port = tty->driver_data;
1671 int room = 4096;
1672 const struct nozomi *dc = get_dc_by_tty(tty);
1673
1674 if (dc)
1675 room = kfifo_avail(&port->fifo_ul);
1676
1677 return room;
1678 }
1679
1680 /* Gets io control parameters */
1681 static int ntty_tiocmget(struct tty_struct *tty)
1682 {
1683 const struct port *port = tty->driver_data;
1684 const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
1685 const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
1686
1687 /* Note: these could change under us but it is not clear this
1688 matters if so */
1689 return (ctrl_ul->RTS ? TIOCM_RTS : 0) |
1690 (ctrl_ul->DTR ? TIOCM_DTR : 0) |
1691 (ctrl_dl->DCD ? TIOCM_CAR : 0) |
1692 (ctrl_dl->RI ? TIOCM_RNG : 0) |
1693 (ctrl_dl->DSR ? TIOCM_DSR : 0) |
1694 (ctrl_dl->CTS ? TIOCM_CTS : 0);
1695 }
1696
1697 /* Sets io controls parameters */
1698 static int ntty_tiocmset(struct tty_struct *tty,
1699 unsigned int set, unsigned int clear)
1700 {
1701 struct nozomi *dc = get_dc_by_tty(tty);
1702 unsigned long flags;
1703
1704 spin_lock_irqsave(&dc->spin_mutex, flags);
1705 if (set & TIOCM_RTS)
1706 set_rts(tty, 1);
1707 else if (clear & TIOCM_RTS)
1708 set_rts(tty, 0);
1709
1710 if (set & TIOCM_DTR)
1711 set_dtr(tty, 1);
1712 else if (clear & TIOCM_DTR)
1713 set_dtr(tty, 0);
1714 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1715
1716 return 0;
1717 }
1718
1719 static int ntty_cflags_changed(struct port *port, unsigned long flags,
1720 struct async_icount *cprev)
1721 {
1722 const struct async_icount cnow = port->tty_icount;
1723 int ret;
1724
1725 ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1726 ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1727 ((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1728 ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
1729
1730 *cprev = cnow;
1731
1732 return ret;
1733 }
1734
1735 static int ntty_tiocgicount(struct tty_struct *tty,
1736 struct serial_icounter_struct *icount)
1737 {
1738 struct port *port = tty->driver_data;
1739 const struct async_icount cnow = port->tty_icount;
1740
1741 icount->cts = cnow.cts;
1742 icount->dsr = cnow.dsr;
1743 icount->rng = cnow.rng;
1744 icount->dcd = cnow.dcd;
1745 icount->rx = cnow.rx;
1746 icount->tx = cnow.tx;
1747 icount->frame = cnow.frame;
1748 icount->overrun = cnow.overrun;
1749 icount->parity = cnow.parity;
1750 icount->brk = cnow.brk;
1751 icount->buf_overrun = cnow.buf_overrun;
1752 return 0;
1753 }
1754
1755 static int ntty_ioctl(struct tty_struct *tty,
1756 unsigned int cmd, unsigned long arg)
1757 {
1758 struct port *port = tty->driver_data;
1759 int rval = -ENOIOCTLCMD;
1760
1761 DBG1("******** IOCTL, cmd: %d", cmd);
1762
1763 switch (cmd) {
1764 case TIOCMIWAIT: {
1765 struct async_icount cprev = port->tty_icount;
1766
1767 rval = wait_event_interruptible(port->tty_wait,
1768 ntty_cflags_changed(port, arg, &cprev));
1769 break;
1770 }
1771 default:
1772 DBG1("ERR: 0x%08X, %d", cmd, cmd);
1773 break;
1774 }
1775
1776 return rval;
1777 }
1778
1779 /*
1780 * Called by the upper tty layer when tty buffers are ready
1781 * to receive data again after a call to throttle.
1782 */
1783 static void ntty_unthrottle(struct tty_struct *tty)
1784 {
1785 struct nozomi *dc = get_dc_by_tty(tty);
1786 unsigned long flags;
1787
1788 DBG1("UNTHROTTLE");
1789 spin_lock_irqsave(&dc->spin_mutex, flags);
1790 enable_transmit_dl(tty->index % MAX_PORT, dc);
1791 set_rts(tty, 1);
1792
1793 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1794 }
1795
1796 /*
1797 * Called by the upper tty layer when the tty buffers are almost full.
1798 * The driver should stop send more data.
1799 */
1800 static void ntty_throttle(struct tty_struct *tty)
1801 {
1802 struct nozomi *dc = get_dc_by_tty(tty);
1803 unsigned long flags;
1804
1805 DBG1("THROTTLE");
1806 spin_lock_irqsave(&dc->spin_mutex, flags);
1807 set_rts(tty, 0);
1808 spin_unlock_irqrestore(&dc->spin_mutex, flags);
1809 }
1810
1811 /* Returns number of chars in buffer, called by tty layer */
1812 static s32 ntty_chars_in_buffer(struct tty_struct *tty)
1813 {
1814 struct port *port = tty->driver_data;
1815 struct nozomi *dc = get_dc_by_tty(tty);
1816 s32 rval = 0;
1817
1818 if (unlikely(!dc || !port)) {
1819 goto exit_in_buffer;
1820 }
1821
1822 rval = kfifo_len(&port->fifo_ul);
1823
1824 exit_in_buffer:
1825 return rval;
1826 }
1827
1828 static const struct tty_port_operations noz_tty_port_ops = {
1829 .activate = ntty_activate,
1830 .shutdown = ntty_shutdown,
1831 };
1832
1833 static const struct tty_operations tty_ops = {
1834 .ioctl = ntty_ioctl,
1835 .open = ntty_open,
1836 .close = ntty_close,
1837 .hangup = ntty_hangup,
1838 .write = ntty_write,
1839 .write_room = ntty_write_room,
1840 .unthrottle = ntty_unthrottle,
1841 .throttle = ntty_throttle,
1842 .chars_in_buffer = ntty_chars_in_buffer,
1843 .tiocmget = ntty_tiocmget,
1844 .tiocmset = ntty_tiocmset,
1845 .get_icount = ntty_tiocgicount,
1846 .install = ntty_install,
1847 .cleanup = ntty_cleanup,
1848 };
1849
1850 /* Module initialization */
1851 static struct pci_driver nozomi_driver = {
1852 .name = NOZOMI_NAME,
1853 .id_table = nozomi_pci_tbl,
1854 .probe = nozomi_card_init,
1855 .remove = nozomi_card_exit,
1856 };
1857
1858 static __init int nozomi_init(void)
1859 {
1860 int ret;
1861
1862 printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
1863
1864 ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
1865 if (!ntty_driver)
1866 return -ENOMEM;
1867
1868 ntty_driver->driver_name = NOZOMI_NAME_TTY;
1869 ntty_driver->name = "noz";
1870 ntty_driver->major = 0;
1871 ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1872 ntty_driver->subtype = SERIAL_TYPE_NORMAL;
1873 ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1874 ntty_driver->init_termios = tty_std_termios;
1875 ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
1876 HUPCL | CLOCAL;
1877 ntty_driver->init_termios.c_ispeed = 115200;
1878 ntty_driver->init_termios.c_ospeed = 115200;
1879 tty_set_operations(ntty_driver, &tty_ops);
1880
1881 ret = tty_register_driver(ntty_driver);
1882 if (ret) {
1883 printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
1884 goto free_tty;
1885 }
1886
1887 ret = pci_register_driver(&nozomi_driver);
1888 if (ret) {
1889 printk(KERN_ERR "Nozomi: can't register pci driver\n");
1890 goto unr_tty;
1891 }
1892
1893 return 0;
1894 unr_tty:
1895 tty_unregister_driver(ntty_driver);
1896 free_tty:
1897 put_tty_driver(ntty_driver);
1898 return ret;
1899 }
1900
1901 static __exit void nozomi_exit(void)
1902 {
1903 printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
1904 pci_unregister_driver(&nozomi_driver);
1905 tty_unregister_driver(ntty_driver);
1906 put_tty_driver(ntty_driver);
1907 }
1908
1909 module_init(nozomi_init);
1910 module_exit(nozomi_exit);
1911
1912 MODULE_LICENSE("Dual BSD/GPL");
1913 MODULE_DESCRIPTION(DRIVER_DESC);
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