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 case 0x04: 402 /* Device end interrupt. */ 403 if ((raw = req->info) == NULL) 404 goto put_tty; /* That shouldn't happen ... */ 405 if (req->type == RAW3215_READ && tty != NULL) { 406 unsigned int cchar; 407 408 count = 160 - req->residual; 409 EBCASC(raw->inbuf, count); 410 cchar = ctrlchar_handle(raw->inbuf, count, tty); 411 switch (cchar & CTRLCHAR_MASK) { 412 case CTRLCHAR_SYSRQ: 413 break; 414 415 case CTRLCHAR_CTRL: 416 tty_insert_flip_char(&raw->port, cchar, 417 TTY_NORMAL); 418 tty_flip_buffer_push(&raw->port); 419 break; 420 421 case CTRLCHAR_NONE: 422 if (count < 2 || 423 (strncmp(raw->inbuf+count-2, "\252n", 2) && 424 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 425 /* add the auto \n */ 426 raw->inbuf[count] = '\n'; 427 count++; 428 } else 429 count -= 2; 430 tty_insert_flip_string(&raw->port, raw->inbuf, 431 count); 432 tty_flip_buffer_push(&raw->port); 433 break; 434 } 435 } else if (req->type == RAW3215_WRITE) { 436 raw->count -= req->len; 437 raw->written -= req->len; 438 } 439 raw->flags &= ~RAW3215_WORKING; 440 raw3215_free_req(req); 441 /* check for empty wait */ 442 if (waitqueue_active(&raw->empty_wait) && 443 raw->queued_write == NULL && 444 raw->queued_read == NULL) { 445 wake_up_interruptible(&raw->empty_wait); 446 } 447 raw3215_next_io(raw, tty); 448 break; 449 default: 450 /* Strange interrupt, I'll do my best to clean up */ 451 if (req != NULL && req->type != RAW3215_FREE) { 452 if (req->type == RAW3215_WRITE) { 453 raw->count -= req->len; 454 raw->written -= req->len; 455 } 456 raw->flags &= ~RAW3215_WORKING; 457 raw3215_free_req(req); 458 } 459 raw3215_next_io(raw, tty); 460 } 461 put_tty: 462 tty_kref_put(tty); 463 } 464 465 /* 466 * Drop the oldest line from the output buffer. 467 */ 468 static void raw3215_drop_line(struct raw3215_info *raw) 469 { 470 int ix; 471 char ch; 472 473 BUG_ON(raw->written != 0); 474 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); 475 while (raw->count > 0) { 476 ch = raw->buffer[ix]; 477 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 478 raw->count--; 479 if (ch == 0x15) 480 break; 481 } 482 raw->head = ix; 483 } 484 485 /* 486 * Wait until length bytes are available int the output buffer. 487 * Has to be called with the s390irq lock held. Can be called 488 * disabled. 489 */ 490 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) 491 { 492 while (RAW3215_BUFFER_SIZE - raw->count < length) { 493 /* While console is frozen for suspend we have no other 494 * choice but to drop message from the buffer to make 495 * room for even more messages. */ 496 if (tty_port_suspended(&raw->port)) { 497 raw3215_drop_line(raw); 498 continue; 499 } 500 /* there might be a request pending */ 501 raw->flags |= RAW3215_FLUSHING; 502 raw3215_mk_write_req(raw); 503 raw3215_try_io(raw); 504 raw->flags &= ~RAW3215_FLUSHING; 505 #ifdef CONFIG_TN3215_CONSOLE 506 ccw_device_wait_idle(raw->cdev); 507 #endif 508 /* Enough room freed up ? */ 509 if (RAW3215_BUFFER_SIZE - raw->count >= length) 510 break; 511 /* there might be another cpu waiting for the lock */ 512 spin_unlock(get_ccwdev_lock(raw->cdev)); 513 udelay(100); 514 spin_lock(get_ccwdev_lock(raw->cdev)); 515 } 516 } 517 518 /* 519 * String write routine for 3215 devices 520 */ 521 static void raw3215_write(struct raw3215_info *raw, const char *str, 522 unsigned int length) 523 { 524 unsigned long flags; 525 int c, count; 526 527 while (length > 0) { 528 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 529 count = (length > RAW3215_BUFFER_SIZE) ? 530 RAW3215_BUFFER_SIZE : length; 531 length -= count; 532 533 raw3215_make_room(raw, count); 534 535 /* copy string to output buffer and convert it to EBCDIC */ 536 while (1) { 537 c = min_t(int, count, 538 min(RAW3215_BUFFER_SIZE - raw->count, 539 RAW3215_BUFFER_SIZE - raw->head)); 540 if (c <= 0) 541 break; 542 memcpy(raw->buffer + raw->head, str, c); 543 ASCEBC(raw->buffer + raw->head, c); 544 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 545 raw->count += c; 546 raw->line_pos += c; 547 str += c; 548 count -= c; 549 } 550 if (!(raw->flags & RAW3215_WORKING)) { 551 raw3215_mk_write_req(raw); 552 /* start or queue request */ 553 raw3215_try_io(raw); 554 } 555 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 556 } 557 } 558 559 /* 560 * Put character routine for 3215 devices 561 */ 562 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 563 { 564 unsigned long flags; 565 unsigned int length, i; 566 567 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 568 if (ch == '\t') { 569 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 570 raw->line_pos += length; 571 ch = ' '; 572 } else if (ch == '\n') { 573 length = 1; 574 raw->line_pos = 0; 575 } else { 576 length = 1; 577 raw->line_pos++; 578 } 579 raw3215_make_room(raw, length); 580 581 for (i = 0; i < length; i++) { 582 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 583 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 584 raw->count++; 585 } 586 if (!(raw->flags & RAW3215_WORKING)) { 587 raw3215_mk_write_req(raw); 588 /* start or queue request */ 589 raw3215_try_io(raw); 590 } 591 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 592 } 593 594 /* 595 * Flush routine, it simply sets the flush flag and tries to start 596 * pending IO. 597 */ 598 static void raw3215_flush_buffer(struct raw3215_info *raw) 599 { 600 unsigned long flags; 601 602 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 603 if (raw->count > 0) { 604 raw->flags |= RAW3215_FLUSHING; 605 raw3215_try_io(raw); 606 raw->flags &= ~RAW3215_FLUSHING; 607 } 608 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 609 } 610 611 /* 612 * Fire up a 3215 device. 613 */ 614 static int raw3215_startup(struct raw3215_info *raw) 615 { 616 unsigned long flags; 617 618 if (tty_port_initialized(&raw->port)) 619 return 0; 620 raw->line_pos = 0; 621 tty_port_set_initialized(&raw->port, 1); 622 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 623 raw3215_try_io(raw); 624 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 625 626 return 0; 627 } 628 629 /* 630 * Shutdown a 3215 device. 631 */ 632 static void raw3215_shutdown(struct raw3215_info *raw) 633 { 634 DECLARE_WAITQUEUE(wait, current); 635 unsigned long flags; 636 637 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED)) 638 return; 639 /* Wait for outstanding requests, then free irq */ 640 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 641 if ((raw->flags & RAW3215_WORKING) || 642 raw->queued_write != NULL || 643 raw->queued_read != NULL) { 644 add_wait_queue(&raw->empty_wait, &wait); 645 set_current_state(TASK_INTERRUPTIBLE); 646 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 647 schedule(); 648 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 649 remove_wait_queue(&raw->empty_wait, &wait); 650 set_current_state(TASK_RUNNING); 651 tty_port_set_initialized(&raw->port, 1); 652 } 653 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 654 } 655 656 static struct raw3215_info *raw3215_alloc_info(void) 657 { 658 struct raw3215_info *info; 659 660 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); 661 if (!info) 662 return NULL; 663 664 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 665 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); 666 if (!info->buffer || !info->inbuf) { 667 kfree(info->inbuf); 668 kfree(info->buffer); 669 kfree(info); 670 return NULL; 671 } 672 673 timer_setup(&info->timer, raw3215_timeout, 0); 674 init_waitqueue_head(&info->empty_wait); 675 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); 676 tty_port_init(&info->port); 677 678 return info; 679 } 680 681 static void raw3215_free_info(struct raw3215_info *raw) 682 { 683 kfree(raw->inbuf); 684 kfree(raw->buffer); 685 tty_port_destroy(&raw->port); 686 kfree(raw); 687 } 688 689 static int raw3215_probe (struct ccw_device *cdev) 690 { 691 struct raw3215_info *raw; 692 int line; 693 694 /* Console is special. */ 695 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) 696 return 0; 697 698 raw = raw3215_alloc_info(); 699 if (raw == NULL) 700 return -ENOMEM; 701 702 raw->cdev = cdev; 703 dev_set_drvdata(&cdev->dev, raw); 704 cdev->handler = raw3215_irq; 705 706 spin_lock(&raw3215_device_lock); 707 for (line = 0; line < NR_3215; line++) { 708 if (!raw3215[line]) { 709 raw3215[line] = raw; 710 break; 711 } 712 } 713 spin_unlock(&raw3215_device_lock); 714 if (line == NR_3215) { 715 raw3215_free_info(raw); 716 return -ENODEV; 717 } 718 719 return 0; 720 } 721 722 static void raw3215_remove (struct ccw_device *cdev) 723 { 724 struct raw3215_info *raw; 725 unsigned int line; 726 727 ccw_device_set_offline(cdev); 728 raw = dev_get_drvdata(&cdev->dev); 729 if (raw) { 730 spin_lock(&raw3215_device_lock); 731 for (line = 0; line < NR_3215; line++) 732 if (raw3215[line] == raw) 733 break; 734 raw3215[line] = NULL; 735 spin_unlock(&raw3215_device_lock); 736 dev_set_drvdata(&cdev->dev, NULL); 737 raw3215_free_info(raw); 738 } 739 } 740 741 static int raw3215_set_online (struct ccw_device *cdev) 742 { 743 struct raw3215_info *raw; 744 745 raw = dev_get_drvdata(&cdev->dev); 746 if (!raw) 747 return -ENODEV; 748 749 return raw3215_startup(raw); 750 } 751 752 static int raw3215_set_offline (struct ccw_device *cdev) 753 { 754 struct raw3215_info *raw; 755 756 raw = dev_get_drvdata(&cdev->dev); 757 if (!raw) 758 return -ENODEV; 759 760 raw3215_shutdown(raw); 761 762 return 0; 763 } 764 765 static int raw3215_pm_stop(struct ccw_device *cdev) 766 { 767 struct raw3215_info *raw; 768 unsigned long flags; 769 770 /* Empty the output buffer, then prevent new I/O. */ 771 raw = dev_get_drvdata(&cdev->dev); 772 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 773 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 774 tty_port_set_suspended(&raw->port, 1); 775 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 776 return 0; 777 } 778 779 static int raw3215_pm_start(struct ccw_device *cdev) 780 { 781 struct raw3215_info *raw; 782 unsigned long flags; 783 784 /* Allow I/O again and flush output buffer. */ 785 raw = dev_get_drvdata(&cdev->dev); 786 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 787 tty_port_set_suspended(&raw->port, 0); 788 raw->flags |= RAW3215_FLUSHING; 789 raw3215_try_io(raw); 790 raw->flags &= ~RAW3215_FLUSHING; 791 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 792 return 0; 793 } 794 795 static struct ccw_device_id raw3215_id[] = { 796 { CCW_DEVICE(0x3215, 0) }, 797 { /* end of list */ }, 798 }; 799 800 static struct ccw_driver raw3215_ccw_driver = { 801 .driver = { 802 .name = "3215", 803 .owner = THIS_MODULE, 804 }, 805 .ids = raw3215_id, 806 .probe = &raw3215_probe, 807 .remove = &raw3215_remove, 808 .set_online = &raw3215_set_online, 809 .set_offline = &raw3215_set_offline, 810 .freeze = &raw3215_pm_stop, 811 .thaw = &raw3215_pm_start, 812 .restore = &raw3215_pm_start, 813 .int_class = IRQIO_C15, 814 }; 815 816 #ifdef CONFIG_TN3215_CONSOLE 817 /* 818 * Write a string to the 3215 console 819 */ 820 static void con3215_write(struct console *co, const char *str, 821 unsigned int count) 822 { 823 struct raw3215_info *raw; 824 int i; 825 826 if (count <= 0) 827 return; 828 raw = raw3215[0]; /* console 3215 is the first one */ 829 while (count > 0) { 830 for (i = 0; i < count; i++) 831 if (str[i] == '\t' || str[i] == '\n') 832 break; 833 raw3215_write(raw, str, i); 834 count -= i; 835 str += i; 836 if (count > 0) { 837 raw3215_putchar(raw, *str); 838 count--; 839 str++; 840 } 841 } 842 } 843 844 static struct tty_driver *con3215_device(struct console *c, int *index) 845 { 846 *index = c->index; 847 return tty3215_driver; 848 } 849 850 /* 851 * panic() calls con3215_flush through a panic_notifier 852 * before the system enters a disabled, endless loop. 853 */ 854 static void con3215_flush(void) 855 { 856 struct raw3215_info *raw; 857 unsigned long flags; 858 859 raw = raw3215[0]; /* console 3215 is the first one */ 860 if (tty_port_suspended(&raw->port)) 861 /* The console is still frozen for suspend. */ 862 if (ccw_device_force_console(raw->cdev)) 863 /* Forcing didn't work, no panic message .. */ 864 return; 865 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 866 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 867 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 868 } 869 870 static int con3215_notify(struct notifier_block *self, 871 unsigned long event, void *data) 872 { 873 con3215_flush(); 874 return NOTIFY_OK; 875 } 876 877 static struct notifier_block on_panic_nb = { 878 .notifier_call = con3215_notify, 879 .priority = 0, 880 }; 881 882 static struct notifier_block on_reboot_nb = { 883 .notifier_call = con3215_notify, 884 .priority = 0, 885 }; 886 887 /* 888 * The console structure for the 3215 console 889 */ 890 static struct console con3215 = { 891 .name = "ttyS", 892 .write = con3215_write, 893 .device = con3215_device, 894 .flags = CON_PRINTBUFFER, 895 }; 896 897 /* 898 * 3215 console initialization code called from console_init(). 899 */ 900 static int __init con3215_init(void) 901 { 902 struct ccw_device *cdev; 903 struct raw3215_info *raw; 904 struct raw3215_req *req; 905 int i; 906 907 /* Check if 3215 is to be the console */ 908 if (!CONSOLE_IS_3215) 909 return -ENODEV; 910 911 /* Set the console mode for VM */ 912 if (MACHINE_IS_VM) { 913 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 914 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 915 } 916 917 /* allocate 3215 request structures */ 918 raw3215_freelist = NULL; 919 spin_lock_init(&raw3215_freelist_lock); 920 for (i = 0; i < NR_3215_REQ; i++) { 921 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); 922 if (!req) 923 return -ENOMEM; 924 req->next = raw3215_freelist; 925 raw3215_freelist = req; 926 } 927 928 cdev = ccw_device_create_console(&raw3215_ccw_driver); 929 if (IS_ERR(cdev)) 930 return -ENODEV; 931 932 raw3215[0] = raw = raw3215_alloc_info(); 933 raw->cdev = cdev; 934 dev_set_drvdata(&cdev->dev, raw); 935 cdev->handler = raw3215_irq; 936 937 raw->flags |= RAW3215_FIXED; 938 if (ccw_device_enable_console(cdev)) { 939 ccw_device_destroy_console(cdev); 940 raw3215_free_info(raw); 941 raw3215[0] = NULL; 942 return -ENODEV; 943 } 944 945 /* Request the console irq */ 946 if (raw3215_startup(raw) != 0) { 947 raw3215_free_info(raw); 948 raw3215[0] = NULL; 949 return -ENODEV; 950 } 951 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 952 register_reboot_notifier(&on_reboot_nb); 953 register_console(&con3215); 954 return 0; 955 } 956 console_initcall(con3215_init); 957 #endif 958 959 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) 960 { 961 struct raw3215_info *raw; 962 963 raw = raw3215[tty->index]; 964 if (raw == NULL) 965 return -ENODEV; 966 967 tty->driver_data = raw; 968 969 return tty_port_install(&raw->port, driver, tty); 970 } 971 972 /* 973 * tty3215_open 974 * 975 * This routine is called whenever a 3215 tty is opened. 976 */ 977 static int tty3215_open(struct tty_struct *tty, struct file * filp) 978 { 979 struct raw3215_info *raw = tty->driver_data; 980 int retval; 981 982 tty_port_tty_set(&raw->port, tty); 983 984 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ 985 /* 986 * Start up 3215 device 987 */ 988 retval = raw3215_startup(raw); 989 if (retval) 990 return retval; 991 992 return 0; 993 } 994 995 /* 996 * tty3215_close() 997 * 998 * This routine is called when the 3215 tty is closed. We wait 999 * for the remaining request to be completed. Then we clean up. 1000 */ 1001 static void tty3215_close(struct tty_struct *tty, struct file * filp) 1002 { 1003 struct raw3215_info *raw; 1004 1005 raw = (struct raw3215_info *) tty->driver_data; 1006 if (raw == NULL || tty->count > 1) 1007 return; 1008 tty->closing = 1; 1009 /* Shutdown the terminal */ 1010 raw3215_shutdown(raw); 1011 tasklet_kill(&raw->tlet); 1012 tty->closing = 0; 1013 tty_port_tty_set(&raw->port, NULL); 1014 } 1015 1016 /* 1017 * Returns the amount of free space in the output buffer. 1018 */ 1019 static int tty3215_write_room(struct tty_struct *tty) 1020 { 1021 struct raw3215_info *raw; 1022 1023 raw = (struct raw3215_info *) tty->driver_data; 1024 1025 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 1026 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 1027 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 1028 else 1029 return 0; 1030 } 1031 1032 /* 1033 * String write routine for 3215 ttys 1034 */ 1035 static int tty3215_write(struct tty_struct * tty, 1036 const unsigned char *buf, int count) 1037 { 1038 struct raw3215_info *raw; 1039 int i, written; 1040 1041 if (!tty) 1042 return 0; 1043 raw = (struct raw3215_info *) tty->driver_data; 1044 written = count; 1045 while (count > 0) { 1046 for (i = 0; i < count; i++) 1047 if (buf[i] == '\t' || buf[i] == '\n') 1048 break; 1049 raw3215_write(raw, buf, i); 1050 count -= i; 1051 buf += i; 1052 if (count > 0) { 1053 raw3215_putchar(raw, *buf); 1054 count--; 1055 buf++; 1056 } 1057 } 1058 return written; 1059 } 1060 1061 /* 1062 * Put character routine for 3215 ttys 1063 */ 1064 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) 1065 { 1066 struct raw3215_info *raw; 1067 1068 if (!tty) 1069 return 0; 1070 raw = (struct raw3215_info *) tty->driver_data; 1071 raw3215_putchar(raw, ch); 1072 return 1; 1073 } 1074 1075 static void tty3215_flush_chars(struct tty_struct *tty) 1076 { 1077 } 1078 1079 /* 1080 * Returns the number of characters in the output buffer 1081 */ 1082 static int tty3215_chars_in_buffer(struct tty_struct *tty) 1083 { 1084 struct raw3215_info *raw; 1085 1086 raw = (struct raw3215_info *) tty->driver_data; 1087 return raw->count; 1088 } 1089 1090 static void tty3215_flush_buffer(struct tty_struct *tty) 1091 { 1092 struct raw3215_info *raw; 1093 1094 raw = (struct raw3215_info *) tty->driver_data; 1095 raw3215_flush_buffer(raw); 1096 tty_wakeup(tty); 1097 } 1098 1099 /* 1100 * Disable reading from a 3215 tty 1101 */ 1102 static void tty3215_throttle(struct tty_struct * tty) 1103 { 1104 struct raw3215_info *raw; 1105 1106 raw = (struct raw3215_info *) tty->driver_data; 1107 raw->flags |= RAW3215_THROTTLED; 1108 } 1109 1110 /* 1111 * Enable reading from a 3215 tty 1112 */ 1113 static void tty3215_unthrottle(struct tty_struct * tty) 1114 { 1115 struct raw3215_info *raw; 1116 unsigned long flags; 1117 1118 raw = (struct raw3215_info *) tty->driver_data; 1119 if (raw->flags & RAW3215_THROTTLED) { 1120 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1121 raw->flags &= ~RAW3215_THROTTLED; 1122 raw3215_try_io(raw); 1123 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1124 } 1125 } 1126 1127 /* 1128 * Disable writing to a 3215 tty 1129 */ 1130 static void tty3215_stop(struct tty_struct *tty) 1131 { 1132 struct raw3215_info *raw; 1133 1134 raw = (struct raw3215_info *) tty->driver_data; 1135 raw->flags |= RAW3215_STOPPED; 1136 } 1137 1138 /* 1139 * Enable writing to a 3215 tty 1140 */ 1141 static void tty3215_start(struct tty_struct *tty) 1142 { 1143 struct raw3215_info *raw; 1144 unsigned long flags; 1145 1146 raw = (struct raw3215_info *) tty->driver_data; 1147 if (raw->flags & RAW3215_STOPPED) { 1148 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1149 raw->flags &= ~RAW3215_STOPPED; 1150 raw3215_try_io(raw); 1151 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1152 } 1153 } 1154 1155 static const struct tty_operations tty3215_ops = { 1156 .install = tty3215_install, 1157 .open = tty3215_open, 1158 .close = tty3215_close, 1159 .write = tty3215_write, 1160 .put_char = tty3215_put_char, 1161 .flush_chars = tty3215_flush_chars, 1162 .write_room = tty3215_write_room, 1163 .chars_in_buffer = tty3215_chars_in_buffer, 1164 .flush_buffer = tty3215_flush_buffer, 1165 .throttle = tty3215_throttle, 1166 .unthrottle = tty3215_unthrottle, 1167 .stop = tty3215_stop, 1168 .start = tty3215_start, 1169 }; 1170 1171 /* 1172 * 3215 tty registration code called from tty_init(). 1173 * Most kernel services (incl. kmalloc) are available at this poimt. 1174 */ 1175 static int __init tty3215_init(void) 1176 { 1177 struct tty_driver *driver; 1178 int ret; 1179 1180 if (!CONSOLE_IS_3215) 1181 return 0; 1182 1183 driver = alloc_tty_driver(NR_3215); 1184 if (!driver) 1185 return -ENOMEM; 1186 1187 ret = ccw_driver_register(&raw3215_ccw_driver); 1188 if (ret) { 1189 put_tty_driver(driver); 1190 return ret; 1191 } 1192 /* 1193 * Initialize the tty_driver structure 1194 * Entries in tty3215_driver that are NOT initialized: 1195 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1196 */ 1197 1198 driver->driver_name = "tty3215"; 1199 driver->name = "ttyS"; 1200 driver->major = TTY_MAJOR; 1201 driver->minor_start = 64; 1202 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1203 driver->subtype = SYSTEM_TYPE_TTY; 1204 driver->init_termios = tty_std_termios; 1205 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1206 driver->init_termios.c_oflag = ONLCR; 1207 driver->init_termios.c_lflag = ISIG; 1208 driver->flags = TTY_DRIVER_REAL_RAW; 1209 tty_set_operations(driver, &tty3215_ops); 1210 ret = tty_register_driver(driver); 1211 if (ret) { 1212 put_tty_driver(driver); 1213 return ret; 1214 } 1215 tty3215_driver = driver; 1216 return 0; 1217 } 1218 device_initcall(tty3215_init); 1219