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 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 * Call tty_wakeup from tasklet context 334 */ 335 static void raw3215_wakeup(unsigned long data) 336 { 337 struct raw3215_info *raw = (struct raw3215_info *) data; 338 struct tty_struct *tty; 339 340 tty = tty_port_tty_get(&raw->port); 341 if (tty) { 342 tty_wakeup(tty); 343 tty_kref_put(tty); 344 } 345 } 346 347 /* 348 * Try to start the next IO and wake up processes waiting on the tty. 349 */ 350 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) 351 { 352 raw3215_mk_write_req(raw); 353 raw3215_try_io(raw); 354 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) 355 tasklet_schedule(&raw->tlet); 356 } 357 358 /* 359 * Interrupt routine, called from common io layer 360 */ 361 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, 362 struct irb *irb) 363 { 364 struct raw3215_info *raw; 365 struct raw3215_req *req; 366 struct tty_struct *tty; 367 int cstat, dstat; 368 int count; 369 370 raw = dev_get_drvdata(&cdev->dev); 371 req = (struct raw3215_req *) intparm; 372 tty = tty_port_tty_get(&raw->port); 373 cstat = irb->scsw.cmd.cstat; 374 dstat = irb->scsw.cmd.dstat; 375 if (cstat != 0) 376 raw3215_next_io(raw, tty); 377 if (dstat & 0x01) { /* we got a unit exception */ 378 dstat &= ~0x01; /* we can ignore it */ 379 } 380 switch (dstat) { 381 case 0x80: 382 if (cstat != 0) 383 break; 384 /* Attention interrupt, someone hit the enter key */ 385 raw3215_mk_read_req(raw); 386 raw3215_next_io(raw, tty); 387 break; 388 case 0x08: 389 case 0x0C: 390 /* Channel end interrupt. */ 391 if ((raw = req->info) == NULL) 392 goto put_tty; /* That shouldn't happen ... */ 393 if (req->type == RAW3215_READ) { 394 /* store residual count, then wait for device end */ 395 req->residual = irb->scsw.cmd.count; 396 } 397 if (dstat == 0x08) 398 break; 399 fallthrough; 400 case 0x04: 401 /* Device end interrupt. */ 402 if ((raw = req->info) == NULL) 403 goto put_tty; /* That shouldn't happen ... */ 404 if (req->type == RAW3215_READ && tty != NULL) { 405 unsigned int cchar; 406 407 count = 160 - req->residual; 408 EBCASC(raw->inbuf, count); 409 cchar = ctrlchar_handle(raw->inbuf, count, tty); 410 switch (cchar & CTRLCHAR_MASK) { 411 case CTRLCHAR_SYSRQ: 412 break; 413 414 case CTRLCHAR_CTRL: 415 tty_insert_flip_char(&raw->port, cchar, 416 TTY_NORMAL); 417 tty_flip_buffer_push(&raw->port); 418 break; 419 420 case CTRLCHAR_NONE: 421 if (count < 2 || 422 (strncmp(raw->inbuf+count-2, "\252n", 2) && 423 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 424 /* add the auto \n */ 425 raw->inbuf[count] = '\n'; 426 count++; 427 } else 428 count -= 2; 429 tty_insert_flip_string(&raw->port, raw->inbuf, 430 count); 431 tty_flip_buffer_push(&raw->port); 432 break; 433 } 434 } else if (req->type == RAW3215_WRITE) { 435 raw->count -= req->len; 436 raw->written -= req->len; 437 } 438 raw->flags &= ~RAW3215_WORKING; 439 raw3215_free_req(req); 440 /* check for empty wait */ 441 if (waitqueue_active(&raw->empty_wait) && 442 raw->queued_write == NULL && 443 raw->queued_read == NULL) { 444 wake_up_interruptible(&raw->empty_wait); 445 } 446 raw3215_next_io(raw, tty); 447 break; 448 default: 449 /* Strange interrupt, I'll do my best to clean up */ 450 if (req != NULL && req->type != RAW3215_FREE) { 451 if (req->type == RAW3215_WRITE) { 452 raw->count -= req->len; 453 raw->written -= req->len; 454 } 455 raw->flags &= ~RAW3215_WORKING; 456 raw3215_free_req(req); 457 } 458 raw3215_next_io(raw, tty); 459 } 460 put_tty: 461 tty_kref_put(tty); 462 } 463 464 /* 465 * Wait until length bytes are available int the output buffer. 466 * Has to be called with the s390irq lock held. Can be called 467 * disabled. 468 */ 469 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) 470 { 471 while (RAW3215_BUFFER_SIZE - raw->count < length) { 472 /* there might be a request pending */ 473 raw->flags |= RAW3215_FLUSHING; 474 raw3215_mk_write_req(raw); 475 raw3215_try_io(raw); 476 raw->flags &= ~RAW3215_FLUSHING; 477 #ifdef CONFIG_TN3215_CONSOLE 478 ccw_device_wait_idle(raw->cdev); 479 #endif 480 /* Enough room freed up ? */ 481 if (RAW3215_BUFFER_SIZE - raw->count >= length) 482 break; 483 /* there might be another cpu waiting for the lock */ 484 spin_unlock(get_ccwdev_lock(raw->cdev)); 485 udelay(100); 486 spin_lock(get_ccwdev_lock(raw->cdev)); 487 } 488 } 489 490 /* 491 * String write routine for 3215 devices 492 */ 493 static void raw3215_write(struct raw3215_info *raw, const char *str, 494 unsigned int length) 495 { 496 unsigned long flags; 497 int c, count; 498 499 while (length > 0) { 500 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 501 count = (length > RAW3215_BUFFER_SIZE) ? 502 RAW3215_BUFFER_SIZE : length; 503 length -= count; 504 505 raw3215_make_room(raw, count); 506 507 /* copy string to output buffer and convert it to EBCDIC */ 508 while (1) { 509 c = min_t(int, count, 510 min(RAW3215_BUFFER_SIZE - raw->count, 511 RAW3215_BUFFER_SIZE - raw->head)); 512 if (c <= 0) 513 break; 514 memcpy(raw->buffer + raw->head, str, c); 515 ASCEBC(raw->buffer + raw->head, c); 516 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 517 raw->count += c; 518 raw->line_pos += c; 519 str += c; 520 count -= c; 521 } 522 if (!(raw->flags & RAW3215_WORKING)) { 523 raw3215_mk_write_req(raw); 524 /* start or queue request */ 525 raw3215_try_io(raw); 526 } 527 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 528 } 529 } 530 531 /* 532 * Put character routine for 3215 devices 533 */ 534 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 535 { 536 unsigned long flags; 537 unsigned int length, i; 538 539 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 540 if (ch == '\t') { 541 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 542 raw->line_pos += length; 543 ch = ' '; 544 } else if (ch == '\n') { 545 length = 1; 546 raw->line_pos = 0; 547 } else { 548 length = 1; 549 raw->line_pos++; 550 } 551 raw3215_make_room(raw, length); 552 553 for (i = 0; i < length; i++) { 554 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 555 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 556 raw->count++; 557 } 558 if (!(raw->flags & RAW3215_WORKING)) { 559 raw3215_mk_write_req(raw); 560 /* start or queue request */ 561 raw3215_try_io(raw); 562 } 563 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 564 } 565 566 /* 567 * Flush routine, it simply sets the flush flag and tries to start 568 * pending IO. 569 */ 570 static void raw3215_flush_buffer(struct raw3215_info *raw) 571 { 572 unsigned long flags; 573 574 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 575 if (raw->count > 0) { 576 raw->flags |= RAW3215_FLUSHING; 577 raw3215_try_io(raw); 578 raw->flags &= ~RAW3215_FLUSHING; 579 } 580 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 581 } 582 583 /* 584 * Fire up a 3215 device. 585 */ 586 static int raw3215_startup(struct raw3215_info *raw) 587 { 588 unsigned long flags; 589 590 if (tty_port_initialized(&raw->port)) 591 return 0; 592 raw->line_pos = 0; 593 tty_port_set_initialized(&raw->port, 1); 594 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 595 raw3215_try_io(raw); 596 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 597 598 return 0; 599 } 600 601 /* 602 * Shutdown a 3215 device. 603 */ 604 static void raw3215_shutdown(struct raw3215_info *raw) 605 { 606 DECLARE_WAITQUEUE(wait, current); 607 unsigned long flags; 608 609 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) 610 return; 611 /* Wait for outstanding requests, then free irq */ 612 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 613 if ((raw->flags & RAW3215_WORKING) || 614 raw->queued_write != NULL || 615 raw->queued_read != NULL) { 616 add_wait_queue(&raw->empty_wait, &wait); 617 set_current_state(TASK_INTERRUPTIBLE); 618 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 619 schedule(); 620 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 621 remove_wait_queue(&raw->empty_wait, &wait); 622 set_current_state(TASK_RUNNING); 623 tty_port_set_initialized(&raw->port, 1); 624 } 625 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 626 } 627 628 static struct raw3215_info *raw3215_alloc_info(void) 629 { 630 struct raw3215_info *info; 631 632 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); 633 if (!info) 634 return NULL; 635 636 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 637 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); 638 if (!info->buffer || !info->inbuf) { 639 kfree(info->inbuf); 640 kfree(info->buffer); 641 kfree(info); 642 return NULL; 643 } 644 645 timer_setup(&info->timer, raw3215_timeout, 0); 646 init_waitqueue_head(&info->empty_wait); 647 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); 648 tty_port_init(&info->port); 649 650 return info; 651 } 652 653 static void raw3215_free_info(struct raw3215_info *raw) 654 { 655 kfree(raw->inbuf); 656 kfree(raw->buffer); 657 tty_port_destroy(&raw->port); 658 kfree(raw); 659 } 660 661 static int raw3215_probe (struct ccw_device *cdev) 662 { 663 struct raw3215_info *raw; 664 int line; 665 666 /* Console is special. */ 667 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) 668 return 0; 669 670 raw = raw3215_alloc_info(); 671 if (raw == NULL) 672 return -ENOMEM; 673 674 raw->cdev = cdev; 675 dev_set_drvdata(&cdev->dev, raw); 676 cdev->handler = raw3215_irq; 677 678 spin_lock(&raw3215_device_lock); 679 for (line = 0; line < NR_3215; line++) { 680 if (!raw3215[line]) { 681 raw3215[line] = raw; 682 break; 683 } 684 } 685 spin_unlock(&raw3215_device_lock); 686 if (line == NR_3215) { 687 raw3215_free_info(raw); 688 return -ENODEV; 689 } 690 691 return 0; 692 } 693 694 static void raw3215_remove (struct ccw_device *cdev) 695 { 696 struct raw3215_info *raw; 697 unsigned int line; 698 699 ccw_device_set_offline(cdev); 700 raw = dev_get_drvdata(&cdev->dev); 701 if (raw) { 702 spin_lock(&raw3215_device_lock); 703 for (line = 0; line < NR_3215; line++) 704 if (raw3215[line] == raw) 705 break; 706 raw3215[line] = NULL; 707 spin_unlock(&raw3215_device_lock); 708 dev_set_drvdata(&cdev->dev, NULL); 709 raw3215_free_info(raw); 710 } 711 } 712 713 static int raw3215_set_online (struct ccw_device *cdev) 714 { 715 struct raw3215_info *raw; 716 717 raw = dev_get_drvdata(&cdev->dev); 718 if (!raw) 719 return -ENODEV; 720 721 return raw3215_startup(raw); 722 } 723 724 static int raw3215_set_offline (struct ccw_device *cdev) 725 { 726 struct raw3215_info *raw; 727 728 raw = dev_get_drvdata(&cdev->dev); 729 if (!raw) 730 return -ENODEV; 731 732 raw3215_shutdown(raw); 733 734 return 0; 735 } 736 737 static struct ccw_device_id raw3215_id[] = { 738 { CCW_DEVICE(0x3215, 0) }, 739 { /* end of list */ }, 740 }; 741 742 static struct ccw_driver raw3215_ccw_driver = { 743 .driver = { 744 .name = "3215", 745 .owner = THIS_MODULE, 746 }, 747 .ids = raw3215_id, 748 .probe = &raw3215_probe, 749 .remove = &raw3215_remove, 750 .set_online = &raw3215_set_online, 751 .set_offline = &raw3215_set_offline, 752 .int_class = IRQIO_C15, 753 }; 754 755 #ifdef CONFIG_TN3215_CONSOLE 756 /* 757 * Write a string to the 3215 console 758 */ 759 static void con3215_write(struct console *co, const char *str, 760 unsigned int count) 761 { 762 struct raw3215_info *raw; 763 int i; 764 765 if (count <= 0) 766 return; 767 raw = raw3215[0]; /* console 3215 is the first one */ 768 while (count > 0) { 769 for (i = 0; i < count; i++) 770 if (str[i] == '\t' || str[i] == '\n') 771 break; 772 raw3215_write(raw, str, i); 773 count -= i; 774 str += i; 775 if (count > 0) { 776 raw3215_putchar(raw, *str); 777 count--; 778 str++; 779 } 780 } 781 } 782 783 static struct tty_driver *con3215_device(struct console *c, int *index) 784 { 785 *index = c->index; 786 return tty3215_driver; 787 } 788 789 /* 790 * panic() calls con3215_flush through a panic_notifier 791 * before the system enters a disabled, endless loop. 792 */ 793 static void con3215_flush(void) 794 { 795 struct raw3215_info *raw; 796 unsigned long flags; 797 798 raw = raw3215[0]; /* console 3215 is the first one */ 799 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 800 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 801 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 802 } 803 804 static int con3215_notify(struct notifier_block *self, 805 unsigned long event, void *data) 806 { 807 con3215_flush(); 808 return NOTIFY_OK; 809 } 810 811 static struct notifier_block on_panic_nb = { 812 .notifier_call = con3215_notify, 813 .priority = 0, 814 }; 815 816 static struct notifier_block on_reboot_nb = { 817 .notifier_call = con3215_notify, 818 .priority = 0, 819 }; 820 821 /* 822 * The console structure for the 3215 console 823 */ 824 static struct console con3215 = { 825 .name = "ttyS", 826 .write = con3215_write, 827 .device = con3215_device, 828 .flags = CON_PRINTBUFFER, 829 }; 830 831 /* 832 * 3215 console initialization code called from console_init(). 833 */ 834 static int __init con3215_init(void) 835 { 836 struct ccw_device *cdev; 837 struct raw3215_info *raw; 838 struct raw3215_req *req; 839 int i; 840 841 /* Check if 3215 is to be the console */ 842 if (!CONSOLE_IS_3215) 843 return -ENODEV; 844 845 /* Set the console mode for VM */ 846 if (MACHINE_IS_VM) { 847 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 848 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 849 } 850 851 /* allocate 3215 request structures */ 852 raw3215_freelist = NULL; 853 spin_lock_init(&raw3215_freelist_lock); 854 for (i = 0; i < NR_3215_REQ; i++) { 855 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); 856 if (!req) 857 return -ENOMEM; 858 req->next = raw3215_freelist; 859 raw3215_freelist = req; 860 } 861 862 cdev = ccw_device_create_console(&raw3215_ccw_driver); 863 if (IS_ERR(cdev)) 864 return -ENODEV; 865 866 raw3215[0] = raw = raw3215_alloc_info(); 867 raw->cdev = cdev; 868 dev_set_drvdata(&cdev->dev, raw); 869 cdev->handler = raw3215_irq; 870 871 raw->flags |= RAW3215_FIXED; 872 if (ccw_device_enable_console(cdev)) { 873 ccw_device_destroy_console(cdev); 874 raw3215_free_info(raw); 875 raw3215[0] = NULL; 876 return -ENODEV; 877 } 878 879 /* Request the console irq */ 880 if (raw3215_startup(raw) != 0) { 881 raw3215_free_info(raw); 882 raw3215[0] = NULL; 883 return -ENODEV; 884 } 885 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 886 register_reboot_notifier(&on_reboot_nb); 887 register_console(&con3215); 888 return 0; 889 } 890 console_initcall(con3215_init); 891 #endif 892 893 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) 894 { 895 struct raw3215_info *raw; 896 897 raw = raw3215[tty->index]; 898 if (raw == NULL) 899 return -ENODEV; 900 901 tty->driver_data = raw; 902 903 return tty_port_install(&raw->port, driver, tty); 904 } 905 906 /* 907 * tty3215_open 908 * 909 * This routine is called whenever a 3215 tty is opened. 910 */ 911 static int tty3215_open(struct tty_struct *tty, struct file * filp) 912 { 913 struct raw3215_info *raw = tty->driver_data; 914 915 tty_port_tty_set(&raw->port, tty); 916 917 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ 918 /* 919 * Start up 3215 device 920 */ 921 return raw3215_startup(raw); 922 } 923 924 /* 925 * tty3215_close() 926 * 927 * This routine is called when the 3215 tty is closed. We wait 928 * for the remaining request to be completed. Then we clean up. 929 */ 930 static void tty3215_close(struct tty_struct *tty, struct file * filp) 931 { 932 struct raw3215_info *raw; 933 934 raw = (struct raw3215_info *) tty->driver_data; 935 if (raw == NULL || tty->count > 1) 936 return; 937 tty->closing = 1; 938 /* Shutdown the terminal */ 939 raw3215_shutdown(raw); 940 tasklet_kill(&raw->tlet); 941 tty->closing = 0; 942 tty_port_tty_set(&raw->port, NULL); 943 } 944 945 /* 946 * Returns the amount of free space in the output buffer. 947 */ 948 static int tty3215_write_room(struct tty_struct *tty) 949 { 950 struct raw3215_info *raw; 951 952 raw = (struct raw3215_info *) tty->driver_data; 953 954 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 955 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 956 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 957 else 958 return 0; 959 } 960 961 /* 962 * String write routine for 3215 ttys 963 */ 964 static int tty3215_write(struct tty_struct * tty, 965 const unsigned char *buf, int count) 966 { 967 struct raw3215_info *raw; 968 int i, written; 969 970 if (!tty) 971 return 0; 972 raw = (struct raw3215_info *) tty->driver_data; 973 written = count; 974 while (count > 0) { 975 for (i = 0; i < count; i++) 976 if (buf[i] == '\t' || buf[i] == '\n') 977 break; 978 raw3215_write(raw, buf, i); 979 count -= i; 980 buf += i; 981 if (count > 0) { 982 raw3215_putchar(raw, *buf); 983 count--; 984 buf++; 985 } 986 } 987 return written; 988 } 989 990 /* 991 * Put character routine for 3215 ttys 992 */ 993 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) 994 { 995 struct raw3215_info *raw; 996 997 if (!tty) 998 return 0; 999 raw = (struct raw3215_info *) tty->driver_data; 1000 raw3215_putchar(raw, ch); 1001 return 1; 1002 } 1003 1004 static void tty3215_flush_chars(struct tty_struct *tty) 1005 { 1006 } 1007 1008 /* 1009 * Returns the number of characters in the output buffer 1010 */ 1011 static int tty3215_chars_in_buffer(struct tty_struct *tty) 1012 { 1013 struct raw3215_info *raw; 1014 1015 raw = (struct raw3215_info *) tty->driver_data; 1016 return raw->count; 1017 } 1018 1019 static void tty3215_flush_buffer(struct tty_struct *tty) 1020 { 1021 struct raw3215_info *raw; 1022 1023 raw = (struct raw3215_info *) tty->driver_data; 1024 raw3215_flush_buffer(raw); 1025 tty_wakeup(tty); 1026 } 1027 1028 /* 1029 * Disable reading from a 3215 tty 1030 */ 1031 static void tty3215_throttle(struct tty_struct * tty) 1032 { 1033 struct raw3215_info *raw; 1034 1035 raw = (struct raw3215_info *) tty->driver_data; 1036 raw->flags |= RAW3215_THROTTLED; 1037 } 1038 1039 /* 1040 * Enable reading from a 3215 tty 1041 */ 1042 static void tty3215_unthrottle(struct tty_struct * tty) 1043 { 1044 struct raw3215_info *raw; 1045 unsigned long flags; 1046 1047 raw = (struct raw3215_info *) tty->driver_data; 1048 if (raw->flags & RAW3215_THROTTLED) { 1049 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1050 raw->flags &= ~RAW3215_THROTTLED; 1051 raw3215_try_io(raw); 1052 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1053 } 1054 } 1055 1056 /* 1057 * Disable writing to a 3215 tty 1058 */ 1059 static void tty3215_stop(struct tty_struct *tty) 1060 { 1061 struct raw3215_info *raw; 1062 1063 raw = (struct raw3215_info *) tty->driver_data; 1064 raw->flags |= RAW3215_STOPPED; 1065 } 1066 1067 /* 1068 * Enable writing to a 3215 tty 1069 */ 1070 static void tty3215_start(struct tty_struct *tty) 1071 { 1072 struct raw3215_info *raw; 1073 unsigned long flags; 1074 1075 raw = (struct raw3215_info *) tty->driver_data; 1076 if (raw->flags & RAW3215_STOPPED) { 1077 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1078 raw->flags &= ~RAW3215_STOPPED; 1079 raw3215_try_io(raw); 1080 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1081 } 1082 } 1083 1084 static const struct tty_operations tty3215_ops = { 1085 .install = tty3215_install, 1086 .open = tty3215_open, 1087 .close = tty3215_close, 1088 .write = tty3215_write, 1089 .put_char = tty3215_put_char, 1090 .flush_chars = tty3215_flush_chars, 1091 .write_room = tty3215_write_room, 1092 .chars_in_buffer = tty3215_chars_in_buffer, 1093 .flush_buffer = tty3215_flush_buffer, 1094 .throttle = tty3215_throttle, 1095 .unthrottle = tty3215_unthrottle, 1096 .stop = tty3215_stop, 1097 .start = tty3215_start, 1098 }; 1099 1100 /* 1101 * 3215 tty registration code called from tty_init(). 1102 * Most kernel services (incl. kmalloc) are available at this poimt. 1103 */ 1104 static int __init tty3215_init(void) 1105 { 1106 struct tty_driver *driver; 1107 int ret; 1108 1109 if (!CONSOLE_IS_3215) 1110 return 0; 1111 1112 driver = alloc_tty_driver(NR_3215); 1113 if (!driver) 1114 return -ENOMEM; 1115 1116 ret = ccw_driver_register(&raw3215_ccw_driver); 1117 if (ret) { 1118 put_tty_driver(driver); 1119 return ret; 1120 } 1121 /* 1122 * Initialize the tty_driver structure 1123 * Entries in tty3215_driver that are NOT initialized: 1124 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1125 */ 1126 1127 driver->driver_name = "tty3215"; 1128 driver->name = "ttyS"; 1129 driver->major = TTY_MAJOR; 1130 driver->minor_start = 64; 1131 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1132 driver->subtype = SYSTEM_TYPE_TTY; 1133 driver->init_termios = tty_std_termios; 1134 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1135 driver->init_termios.c_oflag = ONLCR; 1136 driver->init_termios.c_lflag = ISIG; 1137 driver->flags = TTY_DRIVER_REAL_RAW; 1138 tty_set_operations(driver, &tty3215_ops); 1139 ret = tty_register_driver(driver); 1140 if (ret) { 1141 put_tty_driver(driver); 1142 return ret; 1143 } 1144 tty3215_driver = driver; 1145 return 0; 1146 } 1147 device_initcall(tty3215_init); 1148