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/panic_notifier.h> 23 #include <linux/reboot.h> 24 #include <linux/serial.h> /* ASYNC_* flags */ 25 #include <linux/slab.h> 26 #include <asm/ccwdev.h> 27 #include <asm/cio.h> 28 #include <asm/io.h> 29 #include <asm/ebcdic.h> 30 #include <linux/uaccess.h> 31 #include <asm/delay.h> 32 #include <asm/cpcmd.h> 33 #include <asm/setup.h> 34 35 #include "ctrlchar.h" 36 37 #define NR_3215 1 38 #define NR_3215_REQ (4*NR_3215) 39 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ 40 #define RAW3215_INBUF_SIZE 256 /* input buffer size */ 41 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ 42 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ 43 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ 44 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ 45 #define RAW3215_NR_CCWS 3 46 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ 47 48 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ 49 #define RAW3215_WORKING 4 /* set if a request is being worked on */ 50 #define RAW3215_THROTTLED 8 /* set if reading is disabled */ 51 #define RAW3215_STOPPED 16 /* set if writing is disabled */ 52 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ 53 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ 54 55 #define TAB_STOP_SIZE 8 /* tab stop size */ 56 57 /* 58 * Request types for a 3215 device 59 */ 60 enum raw3215_type { 61 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE 62 }; 63 64 /* 65 * Request structure for a 3215 device 66 */ 67 struct raw3215_req { 68 enum raw3215_type type; /* type of the request */ 69 int start, len; /* start index & len in output buffer */ 70 int delayable; /* indication to wait for more data */ 71 int residual; /* residual count for read request */ 72 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ 73 struct raw3215_info *info; /* pointer to main structure */ 74 struct raw3215_req *next; /* pointer to next request */ 75 } __attribute__ ((aligned(8))); 76 77 struct raw3215_info { 78 struct tty_port port; 79 struct ccw_device *cdev; /* device for tty driver */ 80 spinlock_t *lock; /* pointer to irq lock */ 81 int flags; /* state flags */ 82 char *buffer; /* pointer to output buffer */ 83 char *inbuf; /* pointer to input buffer */ 84 int head; /* first free byte in output buffer */ 85 int count; /* number of bytes in output buffer */ 86 int written; /* number of bytes in write requests */ 87 struct raw3215_req *queued_read; /* pointer to queued read requests */ 88 struct raw3215_req *queued_write;/* pointer to queued write requests */ 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 DEFINE_SPINLOCK(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 raw3215_mk_write_req(raw); 293 raw3215_start_io(raw); 294 if ((raw->queued_read || raw->queued_write) && 295 !(raw->flags & RAW3215_WORKING) && 296 !(raw->flags & RAW3215_TIMER_RUNS)) { 297 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 298 add_timer(&raw->timer); 299 raw->flags |= RAW3215_TIMER_RUNS; 300 } 301 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 302 } 303 304 /* 305 * Function to conditionally start an IO. A read is started immediately, 306 * a write is only started immediately if the flush flag is on or the 307 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not 308 * done immediately a timer is started with a delay of RAW3215_TIMEOUT. 309 */ 310 static inline void raw3215_try_io(struct raw3215_info *raw) 311 { 312 if (!tty_port_initialized(&raw->port)) 313 return; 314 if (raw->queued_read != NULL) 315 raw3215_start_io(raw); 316 else if (raw->queued_write != NULL) { 317 if ((raw->queued_write->delayable == 0) || 318 (raw->flags & RAW3215_FLUSHING)) { 319 /* execute write requests bigger than minimum size */ 320 raw3215_start_io(raw); 321 } 322 } 323 if ((raw->queued_read || raw->queued_write) && 324 !(raw->flags & RAW3215_WORKING) && 325 !(raw->flags & RAW3215_TIMER_RUNS)) { 326 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 327 add_timer(&raw->timer); 328 raw->flags |= RAW3215_TIMER_RUNS; 329 } 330 } 331 332 /* 333 * Try to start the next IO and wake up processes waiting on the tty. 334 */ 335 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) 336 { 337 raw3215_mk_write_req(raw); 338 raw3215_try_io(raw); 339 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) 340 tty_wakeup(tty); 341 } 342 343 /* 344 * Interrupt routine, called from common io layer 345 */ 346 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, 347 struct irb *irb) 348 { 349 struct raw3215_info *raw; 350 struct raw3215_req *req; 351 struct tty_struct *tty; 352 int cstat, dstat; 353 int count; 354 355 raw = dev_get_drvdata(&cdev->dev); 356 req = (struct raw3215_req *) intparm; 357 tty = tty_port_tty_get(&raw->port); 358 cstat = irb->scsw.cmd.cstat; 359 dstat = irb->scsw.cmd.dstat; 360 if (cstat != 0) 361 raw3215_next_io(raw, tty); 362 if (dstat & 0x01) { /* we got a unit exception */ 363 dstat &= ~0x01; /* we can ignore it */ 364 } 365 switch (dstat) { 366 case 0x80: 367 if (cstat != 0) 368 break; 369 /* Attention interrupt, someone hit the enter key */ 370 raw3215_mk_read_req(raw); 371 raw3215_next_io(raw, tty); 372 break; 373 case 0x08: 374 case 0x0C: 375 /* Channel end interrupt. */ 376 if ((raw = req->info) == NULL) 377 goto put_tty; /* That shouldn't happen ... */ 378 if (req->type == RAW3215_READ) { 379 /* store residual count, then wait for device end */ 380 req->residual = irb->scsw.cmd.count; 381 } 382 if (dstat == 0x08) 383 break; 384 fallthrough; 385 case 0x04: 386 /* Device end interrupt. */ 387 if ((raw = req->info) == NULL) 388 goto put_tty; /* That shouldn't happen ... */ 389 if (req->type == RAW3215_READ && tty != NULL) { 390 unsigned int cchar; 391 392 count = 160 - req->residual; 393 EBCASC(raw->inbuf, count); 394 cchar = ctrlchar_handle(raw->inbuf, count, tty); 395 switch (cchar & CTRLCHAR_MASK) { 396 case CTRLCHAR_SYSRQ: 397 break; 398 399 case CTRLCHAR_CTRL: 400 tty_insert_flip_char(&raw->port, cchar, 401 TTY_NORMAL); 402 tty_flip_buffer_push(&raw->port); 403 break; 404 405 case CTRLCHAR_NONE: 406 if (count < 2 || 407 (strncmp(raw->inbuf+count-2, "\252n", 2) && 408 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 409 /* add the auto \n */ 410 raw->inbuf[count] = '\n'; 411 count++; 412 } else 413 count -= 2; 414 tty_insert_flip_string(&raw->port, raw->inbuf, 415 count); 416 tty_flip_buffer_push(&raw->port); 417 break; 418 } 419 } else if (req->type == RAW3215_WRITE) { 420 raw->count -= req->len; 421 raw->written -= req->len; 422 } 423 raw->flags &= ~RAW3215_WORKING; 424 raw3215_free_req(req); 425 /* check for empty wait */ 426 if (waitqueue_active(&raw->empty_wait) && 427 raw->queued_write == NULL && 428 raw->queued_read == NULL) { 429 wake_up_interruptible(&raw->empty_wait); 430 } 431 raw3215_next_io(raw, tty); 432 break; 433 default: 434 /* Strange interrupt, I'll do my best to clean up */ 435 if (req != NULL && req->type != RAW3215_FREE) { 436 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 } 443 raw3215_next_io(raw, tty); 444 } 445 put_tty: 446 tty_kref_put(tty); 447 } 448 449 /* 450 * Wait until length bytes are available int the output buffer. 451 * Has to be called with the s390irq lock held. Can be called 452 * disabled. 453 */ 454 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) 455 { 456 while (RAW3215_BUFFER_SIZE - raw->count < length) { 457 /* there might be a request pending */ 458 raw->flags |= RAW3215_FLUSHING; 459 raw3215_mk_write_req(raw); 460 raw3215_try_io(raw); 461 raw->flags &= ~RAW3215_FLUSHING; 462 #ifdef CONFIG_TN3215_CONSOLE 463 ccw_device_wait_idle(raw->cdev); 464 #endif 465 /* Enough room freed up ? */ 466 if (RAW3215_BUFFER_SIZE - raw->count >= length) 467 break; 468 /* there might be another cpu waiting for the lock */ 469 spin_unlock(get_ccwdev_lock(raw->cdev)); 470 udelay(100); 471 spin_lock(get_ccwdev_lock(raw->cdev)); 472 } 473 } 474 475 /* 476 * String write routine for 3215 devices 477 */ 478 static void raw3215_write(struct raw3215_info *raw, const char *str, 479 unsigned int length) 480 { 481 unsigned long flags; 482 int c, count; 483 484 while (length > 0) { 485 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 486 count = (length > RAW3215_BUFFER_SIZE) ? 487 RAW3215_BUFFER_SIZE : length; 488 length -= count; 489 490 raw3215_make_room(raw, count); 491 492 /* copy string to output buffer and convert it to EBCDIC */ 493 while (1) { 494 c = min_t(int, count, 495 min(RAW3215_BUFFER_SIZE - raw->count, 496 RAW3215_BUFFER_SIZE - raw->head)); 497 if (c <= 0) 498 break; 499 memcpy(raw->buffer + raw->head, str, c); 500 ASCEBC(raw->buffer + raw->head, c); 501 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 502 raw->count += c; 503 raw->line_pos += c; 504 str += c; 505 count -= c; 506 } 507 if (!(raw->flags & RAW3215_WORKING)) { 508 raw3215_mk_write_req(raw); 509 /* start or queue request */ 510 raw3215_try_io(raw); 511 } 512 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 513 } 514 } 515 516 /* 517 * Put character routine for 3215 devices 518 */ 519 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 520 { 521 unsigned long flags; 522 unsigned int length, i; 523 524 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 525 if (ch == '\t') { 526 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 527 raw->line_pos += length; 528 ch = ' '; 529 } else if (ch == '\n') { 530 length = 1; 531 raw->line_pos = 0; 532 } else { 533 length = 1; 534 raw->line_pos++; 535 } 536 raw3215_make_room(raw, length); 537 538 for (i = 0; i < length; i++) { 539 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 540 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 541 raw->count++; 542 } 543 if (!(raw->flags & RAW3215_WORKING)) { 544 raw3215_mk_write_req(raw); 545 /* start or queue request */ 546 raw3215_try_io(raw); 547 } 548 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 549 } 550 551 /* 552 * Flush routine, it simply sets the flush flag and tries to start 553 * pending IO. 554 */ 555 static void raw3215_flush_buffer(struct raw3215_info *raw) 556 { 557 unsigned long flags; 558 559 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 560 if (raw->count > 0) { 561 raw->flags |= RAW3215_FLUSHING; 562 raw3215_try_io(raw); 563 raw->flags &= ~RAW3215_FLUSHING; 564 } 565 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 566 } 567 568 /* 569 * Fire up a 3215 device. 570 */ 571 static int raw3215_startup(struct raw3215_info *raw) 572 { 573 unsigned long flags; 574 575 if (tty_port_initialized(&raw->port)) 576 return 0; 577 raw->line_pos = 0; 578 tty_port_set_initialized(&raw->port, 1); 579 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 580 raw3215_try_io(raw); 581 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 582 583 return 0; 584 } 585 586 /* 587 * Shutdown a 3215 device. 588 */ 589 static void raw3215_shutdown(struct raw3215_info *raw) 590 { 591 DECLARE_WAITQUEUE(wait, current); 592 unsigned long flags; 593 594 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) 595 return; 596 /* Wait for outstanding requests, then free irq */ 597 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 598 if ((raw->flags & RAW3215_WORKING) || 599 raw->queued_write != NULL || 600 raw->queued_read != NULL) { 601 add_wait_queue(&raw->empty_wait, &wait); 602 set_current_state(TASK_INTERRUPTIBLE); 603 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 604 schedule(); 605 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 606 remove_wait_queue(&raw->empty_wait, &wait); 607 set_current_state(TASK_RUNNING); 608 tty_port_set_initialized(&raw->port, 1); 609 } 610 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 611 } 612 613 static struct raw3215_info *raw3215_alloc_info(void) 614 { 615 struct raw3215_info *info; 616 617 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); 618 if (!info) 619 return NULL; 620 621 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 622 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); 623 if (!info->buffer || !info->inbuf) { 624 kfree(info->inbuf); 625 kfree(info->buffer); 626 kfree(info); 627 return NULL; 628 } 629 630 timer_setup(&info->timer, raw3215_timeout, 0); 631 init_waitqueue_head(&info->empty_wait); 632 tty_port_init(&info->port); 633 634 return info; 635 } 636 637 static void raw3215_free_info(struct raw3215_info *raw) 638 { 639 kfree(raw->inbuf); 640 kfree(raw->buffer); 641 tty_port_destroy(&raw->port); 642 kfree(raw); 643 } 644 645 static int raw3215_probe (struct ccw_device *cdev) 646 { 647 struct raw3215_info *raw; 648 int line; 649 650 /* Console is special. */ 651 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) 652 return 0; 653 654 raw = raw3215_alloc_info(); 655 if (raw == NULL) 656 return -ENOMEM; 657 658 raw->cdev = cdev; 659 dev_set_drvdata(&cdev->dev, raw); 660 cdev->handler = raw3215_irq; 661 662 spin_lock(&raw3215_device_lock); 663 for (line = 0; line < NR_3215; line++) { 664 if (!raw3215[line]) { 665 raw3215[line] = raw; 666 break; 667 } 668 } 669 spin_unlock(&raw3215_device_lock); 670 if (line == NR_3215) { 671 raw3215_free_info(raw); 672 return -ENODEV; 673 } 674 675 return 0; 676 } 677 678 static void raw3215_remove (struct ccw_device *cdev) 679 { 680 struct raw3215_info *raw; 681 unsigned int line; 682 683 ccw_device_set_offline(cdev); 684 raw = dev_get_drvdata(&cdev->dev); 685 if (raw) { 686 spin_lock(&raw3215_device_lock); 687 for (line = 0; line < NR_3215; line++) 688 if (raw3215[line] == raw) 689 break; 690 raw3215[line] = NULL; 691 spin_unlock(&raw3215_device_lock); 692 dev_set_drvdata(&cdev->dev, NULL); 693 raw3215_free_info(raw); 694 } 695 } 696 697 static int raw3215_set_online (struct ccw_device *cdev) 698 { 699 struct raw3215_info *raw; 700 701 raw = dev_get_drvdata(&cdev->dev); 702 if (!raw) 703 return -ENODEV; 704 705 return raw3215_startup(raw); 706 } 707 708 static int raw3215_set_offline (struct ccw_device *cdev) 709 { 710 struct raw3215_info *raw; 711 712 raw = dev_get_drvdata(&cdev->dev); 713 if (!raw) 714 return -ENODEV; 715 716 raw3215_shutdown(raw); 717 718 return 0; 719 } 720 721 static struct ccw_device_id raw3215_id[] = { 722 { CCW_DEVICE(0x3215, 0) }, 723 { /* end of list */ }, 724 }; 725 726 static struct ccw_driver raw3215_ccw_driver = { 727 .driver = { 728 .name = "3215", 729 .owner = THIS_MODULE, 730 }, 731 .ids = raw3215_id, 732 .probe = &raw3215_probe, 733 .remove = &raw3215_remove, 734 .set_online = &raw3215_set_online, 735 .set_offline = &raw3215_set_offline, 736 .int_class = IRQIO_C15, 737 }; 738 739 #ifdef CONFIG_TN3215_CONSOLE 740 /* 741 * Write a string to the 3215 console 742 */ 743 static void con3215_write(struct console *co, const char *str, 744 unsigned int count) 745 { 746 struct raw3215_info *raw; 747 int i; 748 749 if (count <= 0) 750 return; 751 raw = raw3215[0]; /* console 3215 is the first one */ 752 while (count > 0) { 753 for (i = 0; i < count; i++) 754 if (str[i] == '\t' || str[i] == '\n') 755 break; 756 raw3215_write(raw, str, i); 757 count -= i; 758 str += i; 759 if (count > 0) { 760 raw3215_putchar(raw, *str); 761 count--; 762 str++; 763 } 764 } 765 } 766 767 static struct tty_driver *con3215_device(struct console *c, int *index) 768 { 769 *index = c->index; 770 return tty3215_driver; 771 } 772 773 /* 774 * The below function is called as a panic/reboot notifier before the 775 * system enters a disabled, endless loop. 776 * 777 * Notice we must use the spin_trylock() alternative, to prevent lockups 778 * in atomic context (panic routine runs with secondary CPUs, local IRQs 779 * and preemption disabled). 780 */ 781 static int con3215_notify(struct notifier_block *self, 782 unsigned long event, void *data) 783 { 784 struct raw3215_info *raw; 785 unsigned long flags; 786 787 raw = raw3215[0]; /* console 3215 is the first one */ 788 if (!spin_trylock_irqsave(get_ccwdev_lock(raw->cdev), flags)) 789 return NOTIFY_DONE; 790 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 791 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 792 793 return NOTIFY_DONE; 794 } 795 796 static struct notifier_block on_panic_nb = { 797 .notifier_call = con3215_notify, 798 .priority = INT_MIN + 1, /* run the callback late */ 799 }; 800 801 static struct notifier_block on_reboot_nb = { 802 .notifier_call = con3215_notify, 803 .priority = INT_MIN + 1, /* run the callback late */ 804 }; 805 806 /* 807 * The console structure for the 3215 console 808 */ 809 static struct console con3215 = { 810 .name = "ttyS", 811 .write = con3215_write, 812 .device = con3215_device, 813 .flags = CON_PRINTBUFFER, 814 }; 815 816 /* 817 * 3215 console initialization code called from console_init(). 818 */ 819 static int __init con3215_init(void) 820 { 821 struct ccw_device *cdev; 822 struct raw3215_info *raw; 823 struct raw3215_req *req; 824 int i; 825 826 /* Check if 3215 is to be the console */ 827 if (!CONSOLE_IS_3215) 828 return -ENODEV; 829 830 /* Set the console mode for VM */ 831 if (MACHINE_IS_VM) { 832 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 833 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 834 } 835 836 /* allocate 3215 request structures */ 837 raw3215_freelist = NULL; 838 for (i = 0; i < NR_3215_REQ; i++) { 839 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); 840 if (!req) 841 return -ENOMEM; 842 req->next = raw3215_freelist; 843 raw3215_freelist = req; 844 } 845 846 cdev = ccw_device_create_console(&raw3215_ccw_driver); 847 if (IS_ERR(cdev)) 848 return -ENODEV; 849 850 raw3215[0] = raw = raw3215_alloc_info(); 851 raw->cdev = cdev; 852 dev_set_drvdata(&cdev->dev, raw); 853 cdev->handler = raw3215_irq; 854 855 raw->flags |= RAW3215_FIXED; 856 if (ccw_device_enable_console(cdev)) { 857 ccw_device_destroy_console(cdev); 858 raw3215_free_info(raw); 859 raw3215[0] = NULL; 860 return -ENODEV; 861 } 862 863 /* Request the console irq */ 864 if (raw3215_startup(raw) != 0) { 865 raw3215_free_info(raw); 866 raw3215[0] = NULL; 867 return -ENODEV; 868 } 869 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 870 register_reboot_notifier(&on_reboot_nb); 871 register_console(&con3215); 872 return 0; 873 } 874 console_initcall(con3215_init); 875 #endif 876 877 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) 878 { 879 struct raw3215_info *raw; 880 881 raw = raw3215[tty->index]; 882 if (raw == NULL) 883 return -ENODEV; 884 885 tty->driver_data = raw; 886 887 return tty_port_install(&raw->port, driver, tty); 888 } 889 890 /* 891 * tty3215_open 892 * 893 * This routine is called whenever a 3215 tty is opened. 894 */ 895 static int tty3215_open(struct tty_struct *tty, struct file * filp) 896 { 897 struct raw3215_info *raw = tty->driver_data; 898 899 tty_port_tty_set(&raw->port, tty); 900 901 /* 902 * Start up 3215 device 903 */ 904 return raw3215_startup(raw); 905 } 906 907 /* 908 * tty3215_close() 909 * 910 * This routine is called when the 3215 tty is closed. We wait 911 * for the remaining request to be completed. Then we clean up. 912 */ 913 static void tty3215_close(struct tty_struct *tty, struct file * filp) 914 { 915 struct raw3215_info *raw = tty->driver_data; 916 917 if (raw == NULL || tty->count > 1) 918 return; 919 tty->closing = 1; 920 /* Shutdown the terminal */ 921 raw3215_shutdown(raw); 922 tty->closing = 0; 923 tty_port_tty_set(&raw->port, NULL); 924 } 925 926 /* 927 * Returns the amount of free space in the output buffer. 928 */ 929 static unsigned int tty3215_write_room(struct tty_struct *tty) 930 { 931 struct raw3215_info *raw = tty->driver_data; 932 933 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 934 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 935 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 936 else 937 return 0; 938 } 939 940 /* 941 * String write routine for 3215 ttys 942 */ 943 static int tty3215_write(struct tty_struct * tty, 944 const unsigned char *buf, int count) 945 { 946 struct raw3215_info *raw = tty->driver_data; 947 int i, written; 948 949 written = count; 950 while (count > 0) { 951 for (i = 0; i < count; i++) 952 if (buf[i] == '\t' || buf[i] == '\n') 953 break; 954 raw3215_write(raw, buf, i); 955 count -= i; 956 buf += i; 957 if (count > 0) { 958 raw3215_putchar(raw, *buf); 959 count--; 960 buf++; 961 } 962 } 963 return written; 964 } 965 966 /* 967 * Put character routine for 3215 ttys 968 */ 969 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) 970 { 971 struct raw3215_info *raw = tty->driver_data; 972 973 raw3215_putchar(raw, ch); 974 975 return 1; 976 } 977 978 static void tty3215_flush_chars(struct tty_struct *tty) 979 { 980 } 981 982 /* 983 * Returns the number of characters in the output buffer 984 */ 985 static unsigned int tty3215_chars_in_buffer(struct tty_struct *tty) 986 { 987 struct raw3215_info *raw = tty->driver_data; 988 989 return raw->count; 990 } 991 992 static void tty3215_flush_buffer(struct tty_struct *tty) 993 { 994 struct raw3215_info *raw = tty->driver_data; 995 996 raw3215_flush_buffer(raw); 997 tty_wakeup(tty); 998 } 999 1000 /* 1001 * Disable reading from a 3215 tty 1002 */ 1003 static void tty3215_throttle(struct tty_struct * tty) 1004 { 1005 struct raw3215_info *raw = tty->driver_data; 1006 1007 raw->flags |= RAW3215_THROTTLED; 1008 } 1009 1010 /* 1011 * Enable reading from a 3215 tty 1012 */ 1013 static void tty3215_unthrottle(struct tty_struct * tty) 1014 { 1015 struct raw3215_info *raw = tty->driver_data; 1016 unsigned long flags; 1017 1018 if (raw->flags & RAW3215_THROTTLED) { 1019 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1020 raw->flags &= ~RAW3215_THROTTLED; 1021 raw3215_try_io(raw); 1022 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1023 } 1024 } 1025 1026 /* 1027 * Disable writing to a 3215 tty 1028 */ 1029 static void tty3215_stop(struct tty_struct *tty) 1030 { 1031 struct raw3215_info *raw = tty->driver_data; 1032 1033 raw->flags |= RAW3215_STOPPED; 1034 } 1035 1036 /* 1037 * Enable writing to a 3215 tty 1038 */ 1039 static void tty3215_start(struct tty_struct *tty) 1040 { 1041 struct raw3215_info *raw = tty->driver_data; 1042 unsigned long flags; 1043 1044 if (raw->flags & RAW3215_STOPPED) { 1045 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1046 raw->flags &= ~RAW3215_STOPPED; 1047 raw3215_try_io(raw); 1048 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1049 } 1050 } 1051 1052 static const struct tty_operations tty3215_ops = { 1053 .install = tty3215_install, 1054 .open = tty3215_open, 1055 .close = tty3215_close, 1056 .write = tty3215_write, 1057 .put_char = tty3215_put_char, 1058 .flush_chars = tty3215_flush_chars, 1059 .write_room = tty3215_write_room, 1060 .chars_in_buffer = tty3215_chars_in_buffer, 1061 .flush_buffer = tty3215_flush_buffer, 1062 .throttle = tty3215_throttle, 1063 .unthrottle = tty3215_unthrottle, 1064 .stop = tty3215_stop, 1065 .start = tty3215_start, 1066 }; 1067 1068 /* 1069 * 3215 tty registration code called from tty_init(). 1070 * Most kernel services (incl. kmalloc) are available at this poimt. 1071 */ 1072 static int __init tty3215_init(void) 1073 { 1074 struct tty_driver *driver; 1075 int ret; 1076 1077 if (!CONSOLE_IS_3215) 1078 return 0; 1079 1080 driver = tty_alloc_driver(NR_3215, TTY_DRIVER_REAL_RAW); 1081 if (IS_ERR(driver)) 1082 return PTR_ERR(driver); 1083 1084 ret = ccw_driver_register(&raw3215_ccw_driver); 1085 if (ret) { 1086 tty_driver_kref_put(driver); 1087 return ret; 1088 } 1089 /* 1090 * Initialize the tty_driver structure 1091 * Entries in tty3215_driver that are NOT initialized: 1092 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1093 */ 1094 1095 driver->driver_name = "tty3215"; 1096 driver->name = "ttyS"; 1097 driver->major = TTY_MAJOR; 1098 driver->minor_start = 64; 1099 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1100 driver->subtype = SYSTEM_TYPE_TTY; 1101 driver->init_termios = tty_std_termios; 1102 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1103 driver->init_termios.c_oflag = ONLCR; 1104 driver->init_termios.c_lflag = ISIG; 1105 tty_set_operations(driver, &tty3215_ops); 1106 ret = tty_register_driver(driver); 1107 if (ret) { 1108 tty_driver_kref_put(driver); 1109 return ret; 1110 } 1111 tty3215_driver = driver; 1112 return 0; 1113 } 1114 device_initcall(tty3215_init); 1115