1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 3215 line mode terminal driver. 4 * 5 * Copyright IBM Corp. 1999, 2009 6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * 8 * Updated: 9 * Aug-2000: Added tab support 10 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu> 11 */ 12 13 #include <linux/types.h> 14 #include <linux/kdev_t.h> 15 #include <linux/tty.h> 16 #include <linux/tty_flip.h> 17 #include <linux/vt_kern.h> 18 #include <linux/init.h> 19 #include <linux/console.h> 20 #include <linux/interrupt.h> 21 #include <linux/err.h> 22 #include <linux/reboot.h> 23 #include <linux/serial.h> /* ASYNC_* flags */ 24 #include <linux/slab.h> 25 #include <asm/ccwdev.h> 26 #include <asm/cio.h> 27 #include <asm/io.h> 28 #include <asm/ebcdic.h> 29 #include <linux/uaccess.h> 30 #include <asm/delay.h> 31 #include <asm/cpcmd.h> 32 #include <asm/setup.h> 33 34 #include "ctrlchar.h" 35 36 #define NR_3215 1 37 #define NR_3215_REQ (4*NR_3215) 38 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ 39 #define RAW3215_INBUF_SIZE 256 /* input buffer size */ 40 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ 41 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ 42 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ 43 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ 44 #define RAW3215_NR_CCWS 3 45 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ 46 47 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ 48 #define RAW3215_WORKING 4 /* set if a request is being worked on */ 49 #define RAW3215_THROTTLED 8 /* set if reading is disabled */ 50 #define RAW3215_STOPPED 16 /* set if writing is disabled */ 51 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ 52 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ 53 54 #define TAB_STOP_SIZE 8 /* tab stop size */ 55 56 /* 57 * Request types for a 3215 device 58 */ 59 enum raw3215_type { 60 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE 61 }; 62 63 /* 64 * Request structure for a 3215 device 65 */ 66 struct raw3215_req { 67 enum raw3215_type type; /* type of the request */ 68 int start, len; /* start index & len in output buffer */ 69 int delayable; /* indication to wait for more data */ 70 int residual; /* residual count for read request */ 71 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ 72 struct raw3215_info *info; /* pointer to main structure */ 73 struct raw3215_req *next; /* pointer to next request */ 74 } __attribute__ ((aligned(8))); 75 76 struct raw3215_info { 77 struct tty_port port; 78 struct ccw_device *cdev; /* device for tty driver */ 79 spinlock_t *lock; /* pointer to irq lock */ 80 int flags; /* state flags */ 81 char *buffer; /* pointer to output buffer */ 82 char *inbuf; /* pointer to input buffer */ 83 int head; /* first free byte in output buffer */ 84 int count; /* number of bytes in output buffer */ 85 int written; /* number of bytes in write requests */ 86 struct raw3215_req *queued_read; /* pointer to queued read requests */ 87 struct raw3215_req *queued_write;/* pointer to queued write requests */ 88 struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ 89 wait_queue_head_t empty_wait; /* wait queue for flushing */ 90 struct timer_list timer; /* timer for delayed output */ 91 int line_pos; /* position on the line (for tabs) */ 92 char ubuffer[80]; /* copy_from_user buffer */ 93 }; 94 95 /* array of 3215 devices structures */ 96 static struct raw3215_info *raw3215[NR_3215]; 97 /* spinlock to protect the raw3215 array */ 98 static DEFINE_SPINLOCK(raw3215_device_lock); 99 /* list of free request structures */ 100 static struct raw3215_req *raw3215_freelist; 101 /* spinlock to protect free list */ 102 static spinlock_t raw3215_freelist_lock; 103 104 static struct tty_driver *tty3215_driver; 105 106 /* 107 * Get a request structure from the free list 108 */ 109 static inline struct raw3215_req *raw3215_alloc_req(void) 110 { 111 struct raw3215_req *req; 112 unsigned long flags; 113 114 spin_lock_irqsave(&raw3215_freelist_lock, flags); 115 req = raw3215_freelist; 116 raw3215_freelist = req->next; 117 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 118 return req; 119 } 120 121 /* 122 * Put a request structure back to the free list 123 */ 124 static inline void raw3215_free_req(struct raw3215_req *req) 125 { 126 unsigned long flags; 127 128 if (req->type == RAW3215_FREE) 129 return; /* don't free a free request */ 130 req->type = RAW3215_FREE; 131 spin_lock_irqsave(&raw3215_freelist_lock, flags); 132 req->next = raw3215_freelist; 133 raw3215_freelist = req; 134 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 135 } 136 137 /* 138 * Set up a read request that reads up to 160 byte from the 3215 device. 139 * If there is a queued read request it is used, but that shouldn't happen 140 * because a 3215 terminal won't accept a new read before the old one is 141 * completed. 142 */ 143 static void raw3215_mk_read_req(struct raw3215_info *raw) 144 { 145 struct raw3215_req *req; 146 struct ccw1 *ccw; 147 148 /* there can only be ONE read request at a time */ 149 req = raw->queued_read; 150 if (req == NULL) { 151 /* no queued read request, use new req structure */ 152 req = raw3215_alloc_req(); 153 req->type = RAW3215_READ; 154 req->info = raw; 155 raw->queued_read = req; 156 } 157 158 ccw = req->ccws; 159 ccw->cmd_code = 0x0A; /* read inquiry */ 160 ccw->flags = 0x20; /* ignore incorrect length */ 161 ccw->count = 160; 162 ccw->cda = (__u32) __pa(raw->inbuf); 163 } 164 165 /* 166 * Set up a write request with the information from the main structure. 167 * A ccw chain is created that writes as much as possible from the output 168 * buffer to the 3215 device. If a queued write exists it is replaced by 169 * the new, probably lengthened request. 170 */ 171 static void raw3215_mk_write_req(struct raw3215_info *raw) 172 { 173 struct raw3215_req *req; 174 struct ccw1 *ccw; 175 int len, count, ix, lines; 176 177 if (raw->count <= raw->written) 178 return; 179 /* check if there is a queued write request */ 180 req = raw->queued_write; 181 if (req == NULL) { 182 /* no queued write request, use new req structure */ 183 req = raw3215_alloc_req(); 184 req->type = RAW3215_WRITE; 185 req->info = raw; 186 raw->queued_write = req; 187 } else { 188 raw->written -= req->len; 189 } 190 191 ccw = req->ccws; 192 req->start = (raw->head - raw->count + raw->written) & 193 (RAW3215_BUFFER_SIZE - 1); 194 /* 195 * now we have to count newlines. We can at max accept 196 * RAW3215_MAX_NEWLINE newlines in a single ssch due to 197 * a restriction in VM 198 */ 199 lines = 0; 200 ix = req->start; 201 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { 202 if (raw->buffer[ix] == 0x15) 203 lines++; 204 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 205 } 206 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; 207 if (len > RAW3215_MAX_BYTES) 208 len = RAW3215_MAX_BYTES; 209 req->len = len; 210 raw->written += len; 211 212 /* set the indication if we should try to enlarge this request */ 213 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); 214 215 ix = req->start; 216 while (len > 0) { 217 if (ccw > req->ccws) 218 ccw[-1].flags |= 0x40; /* use command chaining */ 219 ccw->cmd_code = 0x01; /* write, auto carrier return */ 220 ccw->flags = 0x20; /* ignore incorrect length ind. */ 221 ccw->cda = 222 (__u32) __pa(raw->buffer + ix); 223 count = len; 224 if (ix + count > RAW3215_BUFFER_SIZE) 225 count = RAW3215_BUFFER_SIZE - ix; 226 ccw->count = count; 227 len -= count; 228 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); 229 ccw++; 230 } 231 /* 232 * Add a NOP to the channel program. 3215 devices are purely 233 * emulated and its much better to avoid the channel end 234 * interrupt in this case. 235 */ 236 if (ccw > req->ccws) 237 ccw[-1].flags |= 0x40; /* use command chaining */ 238 ccw->cmd_code = 0x03; /* NOP */ 239 ccw->flags = 0; 240 ccw->cda = 0; 241 ccw->count = 1; 242 } 243 244 /* 245 * Start a read or a write request 246 */ 247 static void raw3215_start_io(struct raw3215_info *raw) 248 { 249 struct raw3215_req *req; 250 int res; 251 252 req = raw->queued_read; 253 if (req != NULL && 254 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { 255 /* dequeue request */ 256 raw->queued_read = NULL; 257 res = ccw_device_start(raw->cdev, req->ccws, 258 (unsigned long) req, 0, 0); 259 if (res != 0) { 260 /* do_IO failed, put request back to queue */ 261 raw->queued_read = req; 262 } else { 263 raw->flags |= RAW3215_WORKING; 264 } 265 } 266 req = raw->queued_write; 267 if (req != NULL && 268 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { 269 /* dequeue request */ 270 raw->queued_write = NULL; 271 res = ccw_device_start(raw->cdev, req->ccws, 272 (unsigned long) req, 0, 0); 273 if (res != 0) { 274 /* do_IO failed, put request back to queue */ 275 raw->queued_write = req; 276 } else { 277 raw->flags |= RAW3215_WORKING; 278 } 279 } 280 } 281 282 /* 283 * Function to start a delayed output after RAW3215_TIMEOUT seconds 284 */ 285 static void raw3215_timeout(struct timer_list *t) 286 { 287 struct raw3215_info *raw = from_timer(raw, t, timer); 288 unsigned long flags; 289 290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 291 raw->flags &= ~RAW3215_TIMER_RUNS; 292 if (!tty_port_suspended(&raw->port)) { 293 raw3215_mk_write_req(raw); 294 raw3215_start_io(raw); 295 if ((raw->queued_read || raw->queued_write) && 296 !(raw->flags & RAW3215_WORKING) && 297 !(raw->flags & RAW3215_TIMER_RUNS)) { 298 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 299 add_timer(&raw->timer); 300 raw->flags |= RAW3215_TIMER_RUNS; 301 } 302 } 303 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 304 } 305 306 /* 307 * Function to conditionally start an IO. A read is started immediately, 308 * a write is only started immediately if the flush flag is on or the 309 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not 310 * done immediately a timer is started with a delay of RAW3215_TIMEOUT. 311 */ 312 static inline void raw3215_try_io(struct raw3215_info *raw) 313 { 314 if (!tty_port_initialized(&raw->port) || tty_port_suspended(&raw->port)) 315 return; 316 if (raw->queued_read != NULL) 317 raw3215_start_io(raw); 318 else if (raw->queued_write != NULL) { 319 if ((raw->queued_write->delayable == 0) || 320 (raw->flags & RAW3215_FLUSHING)) { 321 /* execute write requests bigger than minimum size */ 322 raw3215_start_io(raw); 323 } 324 } 325 if ((raw->queued_read || raw->queued_write) && 326 !(raw->flags & RAW3215_WORKING) && 327 !(raw->flags & RAW3215_TIMER_RUNS)) { 328 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 329 add_timer(&raw->timer); 330 raw->flags |= RAW3215_TIMER_RUNS; 331 } 332 } 333 334 /* 335 * Call tty_wakeup from tasklet context 336 */ 337 static void raw3215_wakeup(unsigned long data) 338 { 339 struct raw3215_info *raw = (struct raw3215_info *) data; 340 struct tty_struct *tty; 341 342 tty = tty_port_tty_get(&raw->port); 343 if (tty) { 344 tty_wakeup(tty); 345 tty_kref_put(tty); 346 } 347 } 348 349 /* 350 * Try to start the next IO and wake up processes waiting on the tty. 351 */ 352 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) 353 { 354 raw3215_mk_write_req(raw); 355 raw3215_try_io(raw); 356 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) 357 tasklet_schedule(&raw->tlet); 358 } 359 360 /* 361 * Interrupt routine, called from common io layer 362 */ 363 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, 364 struct irb *irb) 365 { 366 struct raw3215_info *raw; 367 struct raw3215_req *req; 368 struct tty_struct *tty; 369 int cstat, dstat; 370 int count; 371 372 raw = dev_get_drvdata(&cdev->dev); 373 req = (struct raw3215_req *) intparm; 374 tty = tty_port_tty_get(&raw->port); 375 cstat = irb->scsw.cmd.cstat; 376 dstat = irb->scsw.cmd.dstat; 377 if (cstat != 0) 378 raw3215_next_io(raw, tty); 379 if (dstat & 0x01) { /* we got a unit exception */ 380 dstat &= ~0x01; /* we can ignore it */ 381 } 382 switch (dstat) { 383 case 0x80: 384 if (cstat != 0) 385 break; 386 /* Attention interrupt, someone hit the enter key */ 387 raw3215_mk_read_req(raw); 388 raw3215_next_io(raw, tty); 389 break; 390 case 0x08: 391 case 0x0C: 392 /* Channel end interrupt. */ 393 if ((raw = req->info) == NULL) 394 goto put_tty; /* That shouldn't happen ... */ 395 if (req->type == RAW3215_READ) { 396 /* store residual count, then wait for device end */ 397 req->residual = irb->scsw.cmd.count; 398 } 399 if (dstat == 0x08) 400 break; 401 /* else, fall through */ 402 case 0x04: 403 /* Device end interrupt. */ 404 if ((raw = req->info) == NULL) 405 goto put_tty; /* That shouldn't happen ... */ 406 if (req->type == RAW3215_READ && tty != NULL) { 407 unsigned int cchar; 408 409 count = 160 - req->residual; 410 EBCASC(raw->inbuf, count); 411 cchar = ctrlchar_handle(raw->inbuf, count, tty); 412 switch (cchar & CTRLCHAR_MASK) { 413 case CTRLCHAR_SYSRQ: 414 break; 415 416 case CTRLCHAR_CTRL: 417 tty_insert_flip_char(&raw->port, cchar, 418 TTY_NORMAL); 419 tty_flip_buffer_push(&raw->port); 420 break; 421 422 case CTRLCHAR_NONE: 423 if (count < 2 || 424 (strncmp(raw->inbuf+count-2, "\252n", 2) && 425 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 426 /* add the auto \n */ 427 raw->inbuf[count] = '\n'; 428 count++; 429 } else 430 count -= 2; 431 tty_insert_flip_string(&raw->port, raw->inbuf, 432 count); 433 tty_flip_buffer_push(&raw->port); 434 break; 435 } 436 } else if (req->type == RAW3215_WRITE) { 437 raw->count -= req->len; 438 raw->written -= req->len; 439 } 440 raw->flags &= ~RAW3215_WORKING; 441 raw3215_free_req(req); 442 /* check for empty wait */ 443 if (waitqueue_active(&raw->empty_wait) && 444 raw->queued_write == NULL && 445 raw->queued_read == NULL) { 446 wake_up_interruptible(&raw->empty_wait); 447 } 448 raw3215_next_io(raw, tty); 449 break; 450 default: 451 /* Strange interrupt, I'll do my best to clean up */ 452 if (req != NULL && req->type != RAW3215_FREE) { 453 if (req->type == RAW3215_WRITE) { 454 raw->count -= req->len; 455 raw->written -= req->len; 456 } 457 raw->flags &= ~RAW3215_WORKING; 458 raw3215_free_req(req); 459 } 460 raw3215_next_io(raw, tty); 461 } 462 put_tty: 463 tty_kref_put(tty); 464 } 465 466 /* 467 * Drop the oldest line from the output buffer. 468 */ 469 static void raw3215_drop_line(struct raw3215_info *raw) 470 { 471 int ix; 472 char ch; 473 474 BUG_ON(raw->written != 0); 475 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); 476 while (raw->count > 0) { 477 ch = raw->buffer[ix]; 478 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 479 raw->count--; 480 if (ch == 0x15) 481 break; 482 } 483 raw->head = ix; 484 } 485 486 /* 487 * Wait until length bytes are available int the output buffer. 488 * Has to be called with the s390irq lock held. Can be called 489 * disabled. 490 */ 491 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) 492 { 493 while (RAW3215_BUFFER_SIZE - raw->count < length) { 494 /* While console is frozen for suspend we have no other 495 * choice but to drop message from the buffer to make 496 * room for even more messages. */ 497 if (tty_port_suspended(&raw->port)) { 498 raw3215_drop_line(raw); 499 continue; 500 } 501 /* there might be a request pending */ 502 raw->flags |= RAW3215_FLUSHING; 503 raw3215_mk_write_req(raw); 504 raw3215_try_io(raw); 505 raw->flags &= ~RAW3215_FLUSHING; 506 #ifdef CONFIG_TN3215_CONSOLE 507 ccw_device_wait_idle(raw->cdev); 508 #endif 509 /* Enough room freed up ? */ 510 if (RAW3215_BUFFER_SIZE - raw->count >= length) 511 break; 512 /* there might be another cpu waiting for the lock */ 513 spin_unlock(get_ccwdev_lock(raw->cdev)); 514 udelay(100); 515 spin_lock(get_ccwdev_lock(raw->cdev)); 516 } 517 } 518 519 /* 520 * String write routine for 3215 devices 521 */ 522 static void raw3215_write(struct raw3215_info *raw, const char *str, 523 unsigned int length) 524 { 525 unsigned long flags; 526 int c, count; 527 528 while (length > 0) { 529 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 530 count = (length > RAW3215_BUFFER_SIZE) ? 531 RAW3215_BUFFER_SIZE : length; 532 length -= count; 533 534 raw3215_make_room(raw, count); 535 536 /* copy string to output buffer and convert it to EBCDIC */ 537 while (1) { 538 c = min_t(int, count, 539 min(RAW3215_BUFFER_SIZE - raw->count, 540 RAW3215_BUFFER_SIZE - raw->head)); 541 if (c <= 0) 542 break; 543 memcpy(raw->buffer + raw->head, str, c); 544 ASCEBC(raw->buffer + raw->head, c); 545 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 546 raw->count += c; 547 raw->line_pos += c; 548 str += c; 549 count -= c; 550 } 551 if (!(raw->flags & RAW3215_WORKING)) { 552 raw3215_mk_write_req(raw); 553 /* start or queue request */ 554 raw3215_try_io(raw); 555 } 556 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 557 } 558 } 559 560 /* 561 * Put character routine for 3215 devices 562 */ 563 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 564 { 565 unsigned long flags; 566 unsigned int length, i; 567 568 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 569 if (ch == '\t') { 570 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 571 raw->line_pos += length; 572 ch = ' '; 573 } else if (ch == '\n') { 574 length = 1; 575 raw->line_pos = 0; 576 } else { 577 length = 1; 578 raw->line_pos++; 579 } 580 raw3215_make_room(raw, length); 581 582 for (i = 0; i < length; i++) { 583 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 584 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 585 raw->count++; 586 } 587 if (!(raw->flags & RAW3215_WORKING)) { 588 raw3215_mk_write_req(raw); 589 /* start or queue request */ 590 raw3215_try_io(raw); 591 } 592 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 593 } 594 595 /* 596 * Flush routine, it simply sets the flush flag and tries to start 597 * pending IO. 598 */ 599 static void raw3215_flush_buffer(struct raw3215_info *raw) 600 { 601 unsigned long flags; 602 603 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 604 if (raw->count > 0) { 605 raw->flags |= RAW3215_FLUSHING; 606 raw3215_try_io(raw); 607 raw->flags &= ~RAW3215_FLUSHING; 608 } 609 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 610 } 611 612 /* 613 * Fire up a 3215 device. 614 */ 615 static int raw3215_startup(struct raw3215_info *raw) 616 { 617 unsigned long flags; 618 619 if (tty_port_initialized(&raw->port)) 620 return 0; 621 raw->line_pos = 0; 622 tty_port_set_initialized(&raw->port, 1); 623 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 624 raw3215_try_io(raw); 625 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 626 627 return 0; 628 } 629 630 /* 631 * Shutdown a 3215 device. 632 */ 633 static void raw3215_shutdown(struct raw3215_info *raw) 634 { 635 DECLARE_WAITQUEUE(wait, current); 636 unsigned long flags; 637 638 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) 639 return; 640 /* Wait for outstanding requests, then free irq */ 641 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 642 if ((raw->flags & RAW3215_WORKING) || 643 raw->queued_write != NULL || 644 raw->queued_read != NULL) { 645 add_wait_queue(&raw->empty_wait, &wait); 646 set_current_state(TASK_INTERRUPTIBLE); 647 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 648 schedule(); 649 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 650 remove_wait_queue(&raw->empty_wait, &wait); 651 set_current_state(TASK_RUNNING); 652 tty_port_set_initialized(&raw->port, 1); 653 } 654 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 655 } 656 657 static struct raw3215_info *raw3215_alloc_info(void) 658 { 659 struct raw3215_info *info; 660 661 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); 662 if (!info) 663 return NULL; 664 665 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 666 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); 667 if (!info->buffer || !info->inbuf) { 668 kfree(info->inbuf); 669 kfree(info->buffer); 670 kfree(info); 671 return NULL; 672 } 673 674 timer_setup(&info->timer, raw3215_timeout, 0); 675 init_waitqueue_head(&info->empty_wait); 676 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); 677 tty_port_init(&info->port); 678 679 return info; 680 } 681 682 static void raw3215_free_info(struct raw3215_info *raw) 683 { 684 kfree(raw->inbuf); 685 kfree(raw->buffer); 686 tty_port_destroy(&raw->port); 687 kfree(raw); 688 } 689 690 static int raw3215_probe (struct ccw_device *cdev) 691 { 692 struct raw3215_info *raw; 693 int line; 694 695 /* Console is special. */ 696 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) 697 return 0; 698 699 raw = raw3215_alloc_info(); 700 if (raw == NULL) 701 return -ENOMEM; 702 703 raw->cdev = cdev; 704 dev_set_drvdata(&cdev->dev, raw); 705 cdev->handler = raw3215_irq; 706 707 spin_lock(&raw3215_device_lock); 708 for (line = 0; line < NR_3215; line++) { 709 if (!raw3215[line]) { 710 raw3215[line] = raw; 711 break; 712 } 713 } 714 spin_unlock(&raw3215_device_lock); 715 if (line == NR_3215) { 716 raw3215_free_info(raw); 717 return -ENODEV; 718 } 719 720 return 0; 721 } 722 723 static void raw3215_remove (struct ccw_device *cdev) 724 { 725 struct raw3215_info *raw; 726 unsigned int line; 727 728 ccw_device_set_offline(cdev); 729 raw = dev_get_drvdata(&cdev->dev); 730 if (raw) { 731 spin_lock(&raw3215_device_lock); 732 for (line = 0; line < NR_3215; line++) 733 if (raw3215[line] == raw) 734 break; 735 raw3215[line] = NULL; 736 spin_unlock(&raw3215_device_lock); 737 dev_set_drvdata(&cdev->dev, NULL); 738 raw3215_free_info(raw); 739 } 740 } 741 742 static int raw3215_set_online (struct ccw_device *cdev) 743 { 744 struct raw3215_info *raw; 745 746 raw = dev_get_drvdata(&cdev->dev); 747 if (!raw) 748 return -ENODEV; 749 750 return raw3215_startup(raw); 751 } 752 753 static int raw3215_set_offline (struct ccw_device *cdev) 754 { 755 struct raw3215_info *raw; 756 757 raw = dev_get_drvdata(&cdev->dev); 758 if (!raw) 759 return -ENODEV; 760 761 raw3215_shutdown(raw); 762 763 return 0; 764 } 765 766 static int raw3215_pm_stop(struct ccw_device *cdev) 767 { 768 struct raw3215_info *raw; 769 unsigned long flags; 770 771 /* Empty the output buffer, then prevent new I/O. */ 772 raw = dev_get_drvdata(&cdev->dev); 773 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 774 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 775 tty_port_set_suspended(&raw->port, 1); 776 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 777 return 0; 778 } 779 780 static int raw3215_pm_start(struct ccw_device *cdev) 781 { 782 struct raw3215_info *raw; 783 unsigned long flags; 784 785 /* Allow I/O again and flush output buffer. */ 786 raw = dev_get_drvdata(&cdev->dev); 787 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 788 tty_port_set_suspended(&raw->port, 0); 789 raw->flags |= RAW3215_FLUSHING; 790 raw3215_try_io(raw); 791 raw->flags &= ~RAW3215_FLUSHING; 792 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 793 return 0; 794 } 795 796 static struct ccw_device_id raw3215_id[] = { 797 { CCW_DEVICE(0x3215, 0) }, 798 { /* end of list */ }, 799 }; 800 801 static struct ccw_driver raw3215_ccw_driver = { 802 .driver = { 803 .name = "3215", 804 .owner = THIS_MODULE, 805 }, 806 .ids = raw3215_id, 807 .probe = &raw3215_probe, 808 .remove = &raw3215_remove, 809 .set_online = &raw3215_set_online, 810 .set_offline = &raw3215_set_offline, 811 .freeze = &raw3215_pm_stop, 812 .thaw = &raw3215_pm_start, 813 .restore = &raw3215_pm_start, 814 .int_class = IRQIO_C15, 815 }; 816 817 #ifdef CONFIG_TN3215_CONSOLE 818 /* 819 * Write a string to the 3215 console 820 */ 821 static void con3215_write(struct console *co, const char *str, 822 unsigned int count) 823 { 824 struct raw3215_info *raw; 825 int i; 826 827 if (count <= 0) 828 return; 829 raw = raw3215[0]; /* console 3215 is the first one */ 830 while (count > 0) { 831 for (i = 0; i < count; i++) 832 if (str[i] == '\t' || str[i] == '\n') 833 break; 834 raw3215_write(raw, str, i); 835 count -= i; 836 str += i; 837 if (count > 0) { 838 raw3215_putchar(raw, *str); 839 count--; 840 str++; 841 } 842 } 843 } 844 845 static struct tty_driver *con3215_device(struct console *c, int *index) 846 { 847 *index = c->index; 848 return tty3215_driver; 849 } 850 851 /* 852 * panic() calls con3215_flush through a panic_notifier 853 * before the system enters a disabled, endless loop. 854 */ 855 static void con3215_flush(void) 856 { 857 struct raw3215_info *raw; 858 unsigned long flags; 859 860 raw = raw3215[0]; /* console 3215 is the first one */ 861 if (tty_port_suspended(&raw->port)) 862 /* The console is still frozen for suspend. */ 863 if (ccw_device_force_console(raw->cdev)) 864 /* Forcing didn't work, no panic message .. */ 865 return; 866 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 867 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 868 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 869 } 870 871 static int con3215_notify(struct notifier_block *self, 872 unsigned long event, void *data) 873 { 874 con3215_flush(); 875 return NOTIFY_OK; 876 } 877 878 static struct notifier_block on_panic_nb = { 879 .notifier_call = con3215_notify, 880 .priority = 0, 881 }; 882 883 static struct notifier_block on_reboot_nb = { 884 .notifier_call = con3215_notify, 885 .priority = 0, 886 }; 887 888 /* 889 * The console structure for the 3215 console 890 */ 891 static struct console con3215 = { 892 .name = "ttyS", 893 .write = con3215_write, 894 .device = con3215_device, 895 .flags = CON_PRINTBUFFER, 896 }; 897 898 /* 899 * 3215 console initialization code called from console_init(). 900 */ 901 static int __init con3215_init(void) 902 { 903 struct ccw_device *cdev; 904 struct raw3215_info *raw; 905 struct raw3215_req *req; 906 int i; 907 908 /* Check if 3215 is to be the console */ 909 if (!CONSOLE_IS_3215) 910 return -ENODEV; 911 912 /* Set the console mode for VM */ 913 if (MACHINE_IS_VM) { 914 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 915 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 916 } 917 918 /* allocate 3215 request structures */ 919 raw3215_freelist = NULL; 920 spin_lock_init(&raw3215_freelist_lock); 921 for (i = 0; i < NR_3215_REQ; i++) { 922 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); 923 if (!req) 924 return -ENOMEM; 925 req->next = raw3215_freelist; 926 raw3215_freelist = req; 927 } 928 929 cdev = ccw_device_create_console(&raw3215_ccw_driver); 930 if (IS_ERR(cdev)) 931 return -ENODEV; 932 933 raw3215[0] = raw = raw3215_alloc_info(); 934 raw->cdev = cdev; 935 dev_set_drvdata(&cdev->dev, raw); 936 cdev->handler = raw3215_irq; 937 938 raw->flags |= RAW3215_FIXED; 939 if (ccw_device_enable_console(cdev)) { 940 ccw_device_destroy_console(cdev); 941 raw3215_free_info(raw); 942 raw3215[0] = NULL; 943 return -ENODEV; 944 } 945 946 /* Request the console irq */ 947 if (raw3215_startup(raw) != 0) { 948 raw3215_free_info(raw); 949 raw3215[0] = NULL; 950 return -ENODEV; 951 } 952 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 953 register_reboot_notifier(&on_reboot_nb); 954 register_console(&con3215); 955 return 0; 956 } 957 console_initcall(con3215_init); 958 #endif 959 960 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) 961 { 962 struct raw3215_info *raw; 963 964 raw = raw3215[tty->index]; 965 if (raw == NULL) 966 return -ENODEV; 967 968 tty->driver_data = raw; 969 970 return tty_port_install(&raw->port, driver, tty); 971 } 972 973 /* 974 * tty3215_open 975 * 976 * This routine is called whenever a 3215 tty is opened. 977 */ 978 static int tty3215_open(struct tty_struct *tty, struct file * filp) 979 { 980 struct raw3215_info *raw = tty->driver_data; 981 int retval; 982 983 tty_port_tty_set(&raw->port, tty); 984 985 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ 986 /* 987 * Start up 3215 device 988 */ 989 retval = raw3215_startup(raw); 990 if (retval) 991 return retval; 992 993 return 0; 994 } 995 996 /* 997 * tty3215_close() 998 * 999 * This routine is called when the 3215 tty is closed. We wait 1000 * for the remaining request to be completed. Then we clean up. 1001 */ 1002 static void tty3215_close(struct tty_struct *tty, struct file * filp) 1003 { 1004 struct raw3215_info *raw; 1005 1006 raw = (struct raw3215_info *) tty->driver_data; 1007 if (raw == NULL || tty->count > 1) 1008 return; 1009 tty->closing = 1; 1010 /* Shutdown the terminal */ 1011 raw3215_shutdown(raw); 1012 tasklet_kill(&raw->tlet); 1013 tty->closing = 0; 1014 tty_port_tty_set(&raw->port, NULL); 1015 } 1016 1017 /* 1018 * Returns the amount of free space in the output buffer. 1019 */ 1020 static int tty3215_write_room(struct tty_struct *tty) 1021 { 1022 struct raw3215_info *raw; 1023 1024 raw = (struct raw3215_info *) tty->driver_data; 1025 1026 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 1027 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 1028 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 1029 else 1030 return 0; 1031 } 1032 1033 /* 1034 * String write routine for 3215 ttys 1035 */ 1036 static int tty3215_write(struct tty_struct * tty, 1037 const unsigned char *buf, int count) 1038 { 1039 struct raw3215_info *raw; 1040 int i, written; 1041 1042 if (!tty) 1043 return 0; 1044 raw = (struct raw3215_info *) tty->driver_data; 1045 written = count; 1046 while (count > 0) { 1047 for (i = 0; i < count; i++) 1048 if (buf[i] == '\t' || buf[i] == '\n') 1049 break; 1050 raw3215_write(raw, buf, i); 1051 count -= i; 1052 buf += i; 1053 if (count > 0) { 1054 raw3215_putchar(raw, *buf); 1055 count--; 1056 buf++; 1057 } 1058 } 1059 return written; 1060 } 1061 1062 /* 1063 * Put character routine for 3215 ttys 1064 */ 1065 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) 1066 { 1067 struct raw3215_info *raw; 1068 1069 if (!tty) 1070 return 0; 1071 raw = (struct raw3215_info *) tty->driver_data; 1072 raw3215_putchar(raw, ch); 1073 return 1; 1074 } 1075 1076 static void tty3215_flush_chars(struct tty_struct *tty) 1077 { 1078 } 1079 1080 /* 1081 * Returns the number of characters in the output buffer 1082 */ 1083 static int tty3215_chars_in_buffer(struct tty_struct *tty) 1084 { 1085 struct raw3215_info *raw; 1086 1087 raw = (struct raw3215_info *) tty->driver_data; 1088 return raw->count; 1089 } 1090 1091 static void tty3215_flush_buffer(struct tty_struct *tty) 1092 { 1093 struct raw3215_info *raw; 1094 1095 raw = (struct raw3215_info *) tty->driver_data; 1096 raw3215_flush_buffer(raw); 1097 tty_wakeup(tty); 1098 } 1099 1100 /* 1101 * Disable reading from a 3215 tty 1102 */ 1103 static void tty3215_throttle(struct tty_struct * tty) 1104 { 1105 struct raw3215_info *raw; 1106 1107 raw = (struct raw3215_info *) tty->driver_data; 1108 raw->flags |= RAW3215_THROTTLED; 1109 } 1110 1111 /* 1112 * Enable reading from a 3215 tty 1113 */ 1114 static void tty3215_unthrottle(struct tty_struct * tty) 1115 { 1116 struct raw3215_info *raw; 1117 unsigned long flags; 1118 1119 raw = (struct raw3215_info *) tty->driver_data; 1120 if (raw->flags & RAW3215_THROTTLED) { 1121 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1122 raw->flags &= ~RAW3215_THROTTLED; 1123 raw3215_try_io(raw); 1124 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1125 } 1126 } 1127 1128 /* 1129 * Disable writing to a 3215 tty 1130 */ 1131 static void tty3215_stop(struct tty_struct *tty) 1132 { 1133 struct raw3215_info *raw; 1134 1135 raw = (struct raw3215_info *) tty->driver_data; 1136 raw->flags |= RAW3215_STOPPED; 1137 } 1138 1139 /* 1140 * Enable writing to a 3215 tty 1141 */ 1142 static void tty3215_start(struct tty_struct *tty) 1143 { 1144 struct raw3215_info *raw; 1145 unsigned long flags; 1146 1147 raw = (struct raw3215_info *) tty->driver_data; 1148 if (raw->flags & RAW3215_STOPPED) { 1149 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1150 raw->flags &= ~RAW3215_STOPPED; 1151 raw3215_try_io(raw); 1152 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1153 } 1154 } 1155 1156 static const struct tty_operations tty3215_ops = { 1157 .install = tty3215_install, 1158 .open = tty3215_open, 1159 .close = tty3215_close, 1160 .write = tty3215_write, 1161 .put_char = tty3215_put_char, 1162 .flush_chars = tty3215_flush_chars, 1163 .write_room = tty3215_write_room, 1164 .chars_in_buffer = tty3215_chars_in_buffer, 1165 .flush_buffer = tty3215_flush_buffer, 1166 .throttle = tty3215_throttle, 1167 .unthrottle = tty3215_unthrottle, 1168 .stop = tty3215_stop, 1169 .start = tty3215_start, 1170 }; 1171 1172 /* 1173 * 3215 tty registration code called from tty_init(). 1174 * Most kernel services (incl. kmalloc) are available at this poimt. 1175 */ 1176 static int __init tty3215_init(void) 1177 { 1178 struct tty_driver *driver; 1179 int ret; 1180 1181 if (!CONSOLE_IS_3215) 1182 return 0; 1183 1184 driver = alloc_tty_driver(NR_3215); 1185 if (!driver) 1186 return -ENOMEM; 1187 1188 ret = ccw_driver_register(&raw3215_ccw_driver); 1189 if (ret) { 1190 put_tty_driver(driver); 1191 return ret; 1192 } 1193 /* 1194 * Initialize the tty_driver structure 1195 * Entries in tty3215_driver that are NOT initialized: 1196 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1197 */ 1198 1199 driver->driver_name = "tty3215"; 1200 driver->name = "ttyS"; 1201 driver->major = TTY_MAJOR; 1202 driver->minor_start = 64; 1203 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1204 driver->subtype = SYSTEM_TYPE_TTY; 1205 driver->init_termios = tty_std_termios; 1206 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1207 driver->init_termios.c_oflag = ONLCR; 1208 driver->init_termios.c_lflag = ISIG; 1209 driver->flags = TTY_DRIVER_REAL_RAW; 1210 tty_set_operations(driver, &tty3215_ops); 1211 ret = tty_register_driver(driver); 1212 if (ret) { 1213 put_tty_driver(driver); 1214 return ret; 1215 } 1216 tty3215_driver = driver; 1217 return 0; 1218 } 1219 device_initcall(tty3215_init); 1220