1 /* 2 * drivers/s390/char/con3215.c 3 * 3215 line mode terminal driver. 4 * 5 * S390 version 6 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 8 * 9 * Updated: 10 * Aug-2000: Added tab support 11 * Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu) 12 */ 13 14 #include <linux/module.h> 15 #include <linux/types.h> 16 #include <linux/kdev_t.h> 17 #include <linux/tty.h> 18 #include <linux/tty_flip.h> 19 #include <linux/vt_kern.h> 20 #include <linux/init.h> 21 #include <linux/console.h> 22 #include <linux/interrupt.h> 23 #include <linux/err.h> 24 25 #include <linux/slab.h> 26 #include <linux/bootmem.h> 27 28 #include <asm/ccwdev.h> 29 #include <asm/cio.h> 30 #include <asm/io.h> 31 #include <asm/ebcdic.h> 32 #include <asm/uaccess.h> 33 #include <asm/delay.h> 34 #include <asm/cpcmd.h> 35 #include <asm/setup.h> 36 37 #include "ctrlchar.h" 38 39 #define NR_3215 1 40 #define NR_3215_REQ (4*NR_3215) 41 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ 42 #define RAW3215_INBUF_SIZE 256 /* input buffer size */ 43 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ 44 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ 45 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ 46 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ 47 #define RAW3215_NR_CCWS 3 48 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ 49 50 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ 51 #define RAW3215_ACTIVE 2 /* set if the device is in use */ 52 #define RAW3215_WORKING 4 /* set if a request is being worked on */ 53 #define RAW3215_THROTTLED 8 /* set if reading is disabled */ 54 #define RAW3215_STOPPED 16 /* set if writing is disabled */ 55 #define RAW3215_CLOSING 32 /* set while in close process */ 56 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ 57 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ 58 59 #define TAB_STOP_SIZE 8 /* tab stop size */ 60 61 /* 62 * Request types for a 3215 device 63 */ 64 enum raw3215_type { 65 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE 66 }; 67 68 /* 69 * Request structure for a 3215 device 70 */ 71 struct raw3215_req { 72 enum raw3215_type type; /* type of the request */ 73 int start, len; /* start index & len in output buffer */ 74 int delayable; /* indication to wait for more data */ 75 int residual; /* residual count for read request */ 76 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ 77 struct raw3215_info *info; /* pointer to main structure */ 78 struct raw3215_req *next; /* pointer to next request */ 79 } __attribute__ ((aligned(8))); 80 81 struct raw3215_info { 82 struct ccw_device *cdev; /* device for tty driver */ 83 spinlock_t *lock; /* pointer to irq lock */ 84 int flags; /* state flags */ 85 char *buffer; /* pointer to output buffer */ 86 char *inbuf; /* pointer to input buffer */ 87 int head; /* first free byte in output buffer */ 88 int count; /* number of bytes in output buffer */ 89 int written; /* number of bytes in write requests */ 90 struct tty_struct *tty; /* pointer to tty structure if present */ 91 struct tasklet_struct tasklet; 92 struct raw3215_req *queued_read; /* pointer to queued read requests */ 93 struct raw3215_req *queued_write;/* pointer to queued write requests */ 94 wait_queue_head_t empty_wait; /* wait queue for flushing */ 95 struct timer_list timer; /* timer for delayed output */ 96 int line_pos; /* position on the line (for tabs) */ 97 char ubuffer[80]; /* copy_from_user buffer */ 98 }; 99 100 /* array of 3215 devices structures */ 101 static struct raw3215_info *raw3215[NR_3215]; 102 /* spinlock to protect the raw3215 array */ 103 static DEFINE_SPINLOCK(raw3215_device_lock); 104 /* list of free request structures */ 105 static struct raw3215_req *raw3215_freelist; 106 /* spinlock to protect free list */ 107 static spinlock_t raw3215_freelist_lock; 108 109 static struct tty_driver *tty3215_driver; 110 111 /* 112 * Get a request structure from the free list 113 */ 114 static inline struct raw3215_req * 115 raw3215_alloc_req(void) { 116 struct raw3215_req *req; 117 unsigned long flags; 118 119 spin_lock_irqsave(&raw3215_freelist_lock, flags); 120 req = raw3215_freelist; 121 raw3215_freelist = req->next; 122 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 123 return req; 124 } 125 126 /* 127 * Put a request structure back to the free list 128 */ 129 static inline void 130 raw3215_free_req(struct raw3215_req *req) { 131 unsigned long flags; 132 133 if (req->type == RAW3215_FREE) 134 return; /* don't free a free request */ 135 req->type = RAW3215_FREE; 136 spin_lock_irqsave(&raw3215_freelist_lock, flags); 137 req->next = raw3215_freelist; 138 raw3215_freelist = req; 139 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 140 } 141 142 /* 143 * Set up a read request that reads up to 160 byte from the 3215 device. 144 * If there is a queued read request it is used, but that shouldn't happen 145 * because a 3215 terminal won't accept a new read before the old one is 146 * completed. 147 */ 148 static void 149 raw3215_mk_read_req(struct raw3215_info *raw) 150 { 151 struct raw3215_req *req; 152 struct ccw1 *ccw; 153 154 /* there can only be ONE read request at a time */ 155 req = raw->queued_read; 156 if (req == NULL) { 157 /* no queued read request, use new req structure */ 158 req = raw3215_alloc_req(); 159 req->type = RAW3215_READ; 160 req->info = raw; 161 raw->queued_read = req; 162 } 163 164 ccw = req->ccws; 165 ccw->cmd_code = 0x0A; /* read inquiry */ 166 ccw->flags = 0x20; /* ignore incorrect length */ 167 ccw->count = 160; 168 ccw->cda = (__u32) __pa(raw->inbuf); 169 } 170 171 /* 172 * Set up a write request with the information from the main structure. 173 * A ccw chain is created that writes as much as possible from the output 174 * buffer to the 3215 device. If a queued write exists it is replaced by 175 * the new, probably lengthened request. 176 */ 177 static void 178 raw3215_mk_write_req(struct raw3215_info *raw) 179 { 180 struct raw3215_req *req; 181 struct ccw1 *ccw; 182 int len, count, ix, lines; 183 184 if (raw->count <= raw->written) 185 return; 186 /* check if there is a queued write request */ 187 req = raw->queued_write; 188 if (req == NULL) { 189 /* no queued write request, use new req structure */ 190 req = raw3215_alloc_req(); 191 req->type = RAW3215_WRITE; 192 req->info = raw; 193 raw->queued_write = req; 194 } else { 195 raw->written -= req->len; 196 } 197 198 ccw = req->ccws; 199 req->start = (raw->head - raw->count + raw->written) & 200 (RAW3215_BUFFER_SIZE - 1); 201 /* 202 * now we have to count newlines. We can at max accept 203 * RAW3215_MAX_NEWLINE newlines in a single ssch due to 204 * a restriction in VM 205 */ 206 lines = 0; 207 ix = req->start; 208 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { 209 if (raw->buffer[ix] == 0x15) 210 lines++; 211 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 212 } 213 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; 214 if (len > RAW3215_MAX_BYTES) 215 len = RAW3215_MAX_BYTES; 216 req->len = len; 217 raw->written += len; 218 219 /* set the indication if we should try to enlarge this request */ 220 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); 221 222 ix = req->start; 223 while (len > 0) { 224 if (ccw > req->ccws) 225 ccw[-1].flags |= 0x40; /* use command chaining */ 226 ccw->cmd_code = 0x01; /* write, auto carrier return */ 227 ccw->flags = 0x20; /* ignore incorrect length ind. */ 228 ccw->cda = 229 (__u32) __pa(raw->buffer + ix); 230 count = len; 231 if (ix + count > RAW3215_BUFFER_SIZE) 232 count = RAW3215_BUFFER_SIZE - ix; 233 ccw->count = count; 234 len -= count; 235 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); 236 ccw++; 237 } 238 /* 239 * Add a NOP to the channel program. 3215 devices are purely 240 * emulated and its much better to avoid the channel end 241 * interrupt in this case. 242 */ 243 if (ccw > req->ccws) 244 ccw[-1].flags |= 0x40; /* use command chaining */ 245 ccw->cmd_code = 0x03; /* NOP */ 246 ccw->flags = 0; 247 ccw->cda = 0; 248 ccw->count = 1; 249 } 250 251 /* 252 * Start a read or a write request 253 */ 254 static void 255 raw3215_start_io(struct raw3215_info *raw) 256 { 257 struct raw3215_req *req; 258 int res; 259 260 req = raw->queued_read; 261 if (req != NULL && 262 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { 263 /* dequeue request */ 264 raw->queued_read = NULL; 265 res = ccw_device_start(raw->cdev, req->ccws, 266 (unsigned long) req, 0, 0); 267 if (res != 0) { 268 /* do_IO failed, put request back to queue */ 269 raw->queued_read = req; 270 } else { 271 raw->flags |= RAW3215_WORKING; 272 } 273 } 274 req = raw->queued_write; 275 if (req != NULL && 276 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { 277 /* dequeue request */ 278 raw->queued_write = NULL; 279 res = ccw_device_start(raw->cdev, req->ccws, 280 (unsigned long) req, 0, 0); 281 if (res != 0) { 282 /* do_IO failed, put request back to queue */ 283 raw->queued_write = req; 284 } else { 285 raw->flags |= RAW3215_WORKING; 286 } 287 } 288 } 289 290 /* 291 * Function to start a delayed output after RAW3215_TIMEOUT seconds 292 */ 293 static void 294 raw3215_timeout(unsigned long __data) 295 { 296 struct raw3215_info *raw = (struct raw3215_info *) __data; 297 unsigned long flags; 298 299 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 300 if (raw->flags & RAW3215_TIMER_RUNS) { 301 del_timer(&raw->timer); 302 raw->flags &= ~RAW3215_TIMER_RUNS; 303 raw3215_mk_write_req(raw); 304 raw3215_start_io(raw); 305 } 306 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 307 } 308 309 /* 310 * Function to conditionally start an IO. A read is started immediately, 311 * a write is only started immediately if the flush flag is on or the 312 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not 313 * done immediately a timer is started with a delay of RAW3215_TIMEOUT. 314 */ 315 static inline void 316 raw3215_try_io(struct raw3215_info *raw) 317 { 318 if (!(raw->flags & RAW3215_ACTIVE)) 319 return; 320 if (raw->queued_read != NULL) 321 raw3215_start_io(raw); 322 else if (raw->queued_write != NULL) { 323 if ((raw->queued_write->delayable == 0) || 324 (raw->flags & RAW3215_FLUSHING)) { 325 /* execute write requests bigger than minimum size */ 326 raw3215_start_io(raw); 327 if (raw->flags & RAW3215_TIMER_RUNS) { 328 del_timer(&raw->timer); 329 raw->flags &= ~RAW3215_TIMER_RUNS; 330 } 331 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { 332 /* delay small writes */ 333 init_timer(&raw->timer); 334 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 335 raw->timer.data = (unsigned long) raw; 336 raw->timer.function = raw3215_timeout; 337 add_timer(&raw->timer); 338 raw->flags |= RAW3215_TIMER_RUNS; 339 } 340 } 341 } 342 343 /* 344 * The bottom half handler routine for 3215 devices. It tries to start 345 * the next IO and wakes up processes waiting on the tty. 346 */ 347 static void 348 raw3215_tasklet(void *data) 349 { 350 struct raw3215_info *raw; 351 struct tty_struct *tty; 352 unsigned long flags; 353 354 raw = (struct raw3215_info *) data; 355 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 356 raw3215_mk_write_req(raw); 357 raw3215_try_io(raw); 358 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 359 tty = raw->tty; 360 if (tty != NULL && 361 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { 362 tty_wakeup(tty); 363 } 364 } 365 366 /* 367 * Interrupt routine, called from common io layer 368 */ 369 static void 370 raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 371 { 372 struct raw3215_info *raw; 373 struct raw3215_req *req; 374 struct tty_struct *tty; 375 int cstat, dstat; 376 int count; 377 378 raw = cdev->dev.driver_data; 379 req = (struct raw3215_req *) intparm; 380 cstat = irb->scsw.cmd.cstat; 381 dstat = irb->scsw.cmd.dstat; 382 if (cstat != 0) 383 tasklet_schedule(&raw->tasklet); 384 if (dstat & 0x01) { /* we got a unit exception */ 385 dstat &= ~0x01; /* we can ignore it */ 386 } 387 switch (dstat) { 388 case 0x80: 389 if (cstat != 0) 390 break; 391 /* Attention interrupt, someone hit the enter key */ 392 raw3215_mk_read_req(raw); 393 tasklet_schedule(&raw->tasklet); 394 break; 395 case 0x08: 396 case 0x0C: 397 /* Channel end interrupt. */ 398 if ((raw = req->info) == NULL) 399 return; /* That shouldn't happen ... */ 400 if (req->type == RAW3215_READ) { 401 /* store residual count, then wait for device end */ 402 req->residual = irb->scsw.cmd.count; 403 } 404 if (dstat == 0x08) 405 break; 406 case 0x04: 407 /* Device end interrupt. */ 408 if ((raw = req->info) == NULL) 409 return; /* That shouldn't happen ... */ 410 if (req->type == RAW3215_READ && raw->tty != NULL) { 411 unsigned int cchar; 412 413 tty = raw->tty; 414 count = 160 - req->residual; 415 EBCASC(raw->inbuf, count); 416 cchar = ctrlchar_handle(raw->inbuf, count, tty); 417 switch (cchar & CTRLCHAR_MASK) { 418 case CTRLCHAR_SYSRQ: 419 break; 420 421 case CTRLCHAR_CTRL: 422 tty_insert_flip_char(tty, cchar, TTY_NORMAL); 423 tty_flip_buffer_push(raw->tty); 424 break; 425 426 case CTRLCHAR_NONE: 427 if (count < 2 || 428 (strncmp(raw->inbuf+count-2, "\252n", 2) && 429 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 430 /* add the auto \n */ 431 raw->inbuf[count] = '\n'; 432 count++; 433 } else 434 count -= 2; 435 tty_insert_flip_string(tty, raw->inbuf, count); 436 tty_flip_buffer_push(raw->tty); 437 break; 438 } 439 } else if (req->type == RAW3215_WRITE) { 440 raw->count -= req->len; 441 raw->written -= req->len; 442 } 443 raw->flags &= ~RAW3215_WORKING; 444 raw3215_free_req(req); 445 /* check for empty wait */ 446 if (waitqueue_active(&raw->empty_wait) && 447 raw->queued_write == NULL && 448 raw->queued_read == NULL) { 449 wake_up_interruptible(&raw->empty_wait); 450 } 451 tasklet_schedule(&raw->tasklet); 452 break; 453 default: 454 /* Strange interrupt, I'll do my best to clean up */ 455 if (req != NULL && req->type != RAW3215_FREE) { 456 if (req->type == RAW3215_WRITE) { 457 raw->count -= req->len; 458 raw->written -= req->len; 459 } 460 raw->flags &= ~RAW3215_WORKING; 461 raw3215_free_req(req); 462 } 463 tasklet_schedule(&raw->tasklet); 464 } 465 return; 466 } 467 468 /* 469 * Wait until length bytes are available int the output buffer. 470 * Has to be called with the s390irq lock held. Can be called 471 * disabled. 472 */ 473 static void 474 raw3215_make_room(struct raw3215_info *raw, unsigned int length) 475 { 476 while (RAW3215_BUFFER_SIZE - raw->count < length) { 477 /* there might be a request pending */ 478 raw->flags |= RAW3215_FLUSHING; 479 raw3215_mk_write_req(raw); 480 raw3215_try_io(raw); 481 raw->flags &= ~RAW3215_FLUSHING; 482 #ifdef CONFIG_TN3215_CONSOLE 483 wait_cons_dev(); 484 #endif 485 /* Enough room freed up ? */ 486 if (RAW3215_BUFFER_SIZE - raw->count >= length) 487 break; 488 /* there might be another cpu waiting for the lock */ 489 spin_unlock(get_ccwdev_lock(raw->cdev)); 490 udelay(100); 491 spin_lock(get_ccwdev_lock(raw->cdev)); 492 } 493 } 494 495 /* 496 * String write routine for 3215 devices 497 */ 498 static void 499 raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length) 500 { 501 unsigned long flags; 502 int c, count; 503 504 while (length > 0) { 505 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 506 count = (length > RAW3215_BUFFER_SIZE) ? 507 RAW3215_BUFFER_SIZE : length; 508 length -= count; 509 510 raw3215_make_room(raw, count); 511 512 /* copy string to output buffer and convert it to EBCDIC */ 513 while (1) { 514 c = min_t(int, count, 515 min(RAW3215_BUFFER_SIZE - raw->count, 516 RAW3215_BUFFER_SIZE - raw->head)); 517 if (c <= 0) 518 break; 519 memcpy(raw->buffer + raw->head, str, c); 520 ASCEBC(raw->buffer + raw->head, c); 521 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 522 raw->count += c; 523 raw->line_pos += c; 524 str += c; 525 count -= c; 526 } 527 if (!(raw->flags & RAW3215_WORKING)) { 528 raw3215_mk_write_req(raw); 529 /* start or queue request */ 530 raw3215_try_io(raw); 531 } 532 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 533 } 534 } 535 536 /* 537 * Put character routine for 3215 devices 538 */ 539 static void 540 raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 541 { 542 unsigned long flags; 543 unsigned int length, i; 544 545 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 546 if (ch == '\t') { 547 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 548 raw->line_pos += length; 549 ch = ' '; 550 } else if (ch == '\n') { 551 length = 1; 552 raw->line_pos = 0; 553 } else { 554 length = 1; 555 raw->line_pos++; 556 } 557 raw3215_make_room(raw, length); 558 559 for (i = 0; i < length; i++) { 560 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 561 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 562 raw->count++; 563 } 564 if (!(raw->flags & RAW3215_WORKING)) { 565 raw3215_mk_write_req(raw); 566 /* start or queue request */ 567 raw3215_try_io(raw); 568 } 569 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 570 } 571 572 /* 573 * Flush routine, it simply sets the flush flag and tries to start 574 * pending IO. 575 */ 576 static void 577 raw3215_flush_buffer(struct raw3215_info *raw) 578 { 579 unsigned long flags; 580 581 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 582 if (raw->count > 0) { 583 raw->flags |= RAW3215_FLUSHING; 584 raw3215_try_io(raw); 585 raw->flags &= ~RAW3215_FLUSHING; 586 } 587 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 588 } 589 590 /* 591 * Fire up a 3215 device. 592 */ 593 static int 594 raw3215_startup(struct raw3215_info *raw) 595 { 596 unsigned long flags; 597 598 if (raw->flags & RAW3215_ACTIVE) 599 return 0; 600 raw->line_pos = 0; 601 raw->flags |= RAW3215_ACTIVE; 602 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 603 raw3215_try_io(raw); 604 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 605 606 return 0; 607 } 608 609 /* 610 * Shutdown a 3215 device. 611 */ 612 static void 613 raw3215_shutdown(struct raw3215_info *raw) 614 { 615 DECLARE_WAITQUEUE(wait, current); 616 unsigned long flags; 617 618 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) 619 return; 620 /* Wait for outstanding requests, then free irq */ 621 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 622 if ((raw->flags & RAW3215_WORKING) || 623 raw->queued_write != NULL || 624 raw->queued_read != NULL) { 625 raw->flags |= RAW3215_CLOSING; 626 add_wait_queue(&raw->empty_wait, &wait); 627 set_current_state(TASK_INTERRUPTIBLE); 628 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 629 schedule(); 630 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 631 remove_wait_queue(&raw->empty_wait, &wait); 632 set_current_state(TASK_RUNNING); 633 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); 634 } 635 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 636 } 637 638 static int 639 raw3215_probe (struct ccw_device *cdev) 640 { 641 struct raw3215_info *raw; 642 int line; 643 644 /* Console is special. */ 645 if (raw3215[0] && (cdev->dev.driver_data == raw3215[0])) 646 return 0; 647 raw = kmalloc(sizeof(struct raw3215_info) + 648 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); 649 if (raw == NULL) 650 return -ENOMEM; 651 652 spin_lock(&raw3215_device_lock); 653 for (line = 0; line < NR_3215; line++) { 654 if (!raw3215[line]) { 655 raw3215[line] = raw; 656 break; 657 } 658 } 659 spin_unlock(&raw3215_device_lock); 660 if (line == NR_3215) { 661 kfree(raw); 662 return -ENODEV; 663 } 664 665 raw->cdev = cdev; 666 raw->inbuf = (char *) raw + sizeof(struct raw3215_info); 667 memset(raw, 0, sizeof(struct raw3215_info)); 668 raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, 669 GFP_KERNEL|GFP_DMA); 670 if (raw->buffer == NULL) { 671 spin_lock(&raw3215_device_lock); 672 raw3215[line] = NULL; 673 spin_unlock(&raw3215_device_lock); 674 kfree(raw); 675 return -ENOMEM; 676 } 677 tasklet_init(&raw->tasklet, 678 (void (*)(unsigned long)) raw3215_tasklet, 679 (unsigned long) raw); 680 init_waitqueue_head(&raw->empty_wait); 681 682 cdev->dev.driver_data = raw; 683 cdev->handler = raw3215_irq; 684 685 return 0; 686 } 687 688 static void 689 raw3215_remove (struct ccw_device *cdev) 690 { 691 struct raw3215_info *raw; 692 693 ccw_device_set_offline(cdev); 694 raw = cdev->dev.driver_data; 695 if (raw) { 696 cdev->dev.driver_data = NULL; 697 kfree(raw->buffer); 698 kfree(raw); 699 } 700 } 701 702 static int 703 raw3215_set_online (struct ccw_device *cdev) 704 { 705 struct raw3215_info *raw; 706 707 raw = cdev->dev.driver_data; 708 if (!raw) 709 return -ENODEV; 710 711 return raw3215_startup(raw); 712 } 713 714 static int 715 raw3215_set_offline (struct ccw_device *cdev) 716 { 717 struct raw3215_info *raw; 718 719 raw = cdev->dev.driver_data; 720 if (!raw) 721 return -ENODEV; 722 723 raw3215_shutdown(raw); 724 725 return 0; 726 } 727 728 static struct ccw_device_id raw3215_id[] = { 729 { CCW_DEVICE(0x3215, 0) }, 730 { /* end of list */ }, 731 }; 732 733 static struct ccw_driver raw3215_ccw_driver = { 734 .name = "3215", 735 .owner = THIS_MODULE, 736 .ids = raw3215_id, 737 .probe = &raw3215_probe, 738 .remove = &raw3215_remove, 739 .set_online = &raw3215_set_online, 740 .set_offline = &raw3215_set_offline, 741 }; 742 743 #ifdef CONFIG_TN3215_CONSOLE 744 /* 745 * Write a string to the 3215 console 746 */ 747 static void 748 con3215_write(struct console *co, const char *str, unsigned int count) 749 { 750 struct raw3215_info *raw; 751 int i; 752 753 if (count <= 0) 754 return; 755 raw = raw3215[0]; /* console 3215 is the first one */ 756 while (count > 0) { 757 for (i = 0; i < count; i++) 758 if (str[i] == '\t' || str[i] == '\n') 759 break; 760 raw3215_write(raw, str, i); 761 count -= i; 762 str += i; 763 if (count > 0) { 764 raw3215_putchar(raw, *str); 765 count--; 766 str++; 767 } 768 } 769 } 770 771 static struct tty_driver *con3215_device(struct console *c, int *index) 772 { 773 *index = c->index; 774 return tty3215_driver; 775 } 776 777 /* 778 * panic() calls console_unblank before the system enters a 779 * disabled, endless loop. 780 */ 781 static void 782 con3215_unblank(void) 783 { 784 struct raw3215_info *raw; 785 unsigned long flags; 786 787 raw = raw3215[0]; /* console 3215 is the first one */ 788 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 789 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 790 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 791 } 792 793 /* 794 * The console structure for the 3215 console 795 */ 796 static struct console con3215 = { 797 .name = "ttyS", 798 .write = con3215_write, 799 .device = con3215_device, 800 .unblank = con3215_unblank, 801 .flags = CON_PRINTBUFFER, 802 }; 803 804 /* 805 * 3215 console initialization code called from console_init(). 806 * NOTE: This is called before kmalloc is available. 807 */ 808 static int __init 809 con3215_init(void) 810 { 811 struct ccw_device *cdev; 812 struct raw3215_info *raw; 813 struct raw3215_req *req; 814 int i; 815 816 /* Check if 3215 is to be the console */ 817 if (!CONSOLE_IS_3215) 818 return -ENODEV; 819 820 /* Set the console mode for VM */ 821 if (MACHINE_IS_VM) { 822 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 823 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 824 } 825 826 /* allocate 3215 request structures */ 827 raw3215_freelist = NULL; 828 spin_lock_init(&raw3215_freelist_lock); 829 for (i = 0; i < NR_3215_REQ; i++) { 830 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); 831 req->next = raw3215_freelist; 832 raw3215_freelist = req; 833 } 834 835 cdev = ccw_device_probe_console(); 836 if (IS_ERR(cdev)) 837 return -ENODEV; 838 839 raw3215[0] = raw = (struct raw3215_info *) 840 alloc_bootmem_low(sizeof(struct raw3215_info)); 841 memset(raw, 0, sizeof(struct raw3215_info)); 842 raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); 843 raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); 844 raw->cdev = cdev; 845 cdev->dev.driver_data = raw; 846 cdev->handler = raw3215_irq; 847 848 raw->flags |= RAW3215_FIXED; 849 tasklet_init(&raw->tasklet, 850 (void (*)(unsigned long)) raw3215_tasklet, 851 (unsigned long) raw); 852 init_waitqueue_head(&raw->empty_wait); 853 854 /* Request the console irq */ 855 if (raw3215_startup(raw) != 0) { 856 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); 857 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); 858 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info)); 859 raw3215[0] = NULL; 860 return -ENODEV; 861 } 862 register_console(&con3215); 863 return 0; 864 } 865 console_initcall(con3215_init); 866 #endif 867 868 /* 869 * tty3215_open 870 * 871 * This routine is called whenever a 3215 tty is opened. 872 */ 873 static int 874 tty3215_open(struct tty_struct *tty, struct file * filp) 875 { 876 struct raw3215_info *raw; 877 int retval, line; 878 879 line = tty->index; 880 if ((line < 0) || (line >= NR_3215)) 881 return -ENODEV; 882 883 raw = raw3215[line]; 884 if (raw == NULL) 885 return -ENODEV; 886 887 tty->driver_data = raw; 888 raw->tty = tty; 889 890 tty->low_latency = 0; /* don't use bottom half for pushing chars */ 891 /* 892 * Start up 3215 device 893 */ 894 retval = raw3215_startup(raw); 895 if (retval) 896 return retval; 897 898 return 0; 899 } 900 901 /* 902 * tty3215_close() 903 * 904 * This routine is called when the 3215 tty is closed. We wait 905 * for the remaining request to be completed. Then we clean up. 906 */ 907 static void 908 tty3215_close(struct tty_struct *tty, struct file * filp) 909 { 910 struct raw3215_info *raw; 911 912 raw = (struct raw3215_info *) tty->driver_data; 913 if (raw == NULL || tty->count > 1) 914 return; 915 tty->closing = 1; 916 /* Shutdown the terminal */ 917 raw3215_shutdown(raw); 918 tty->closing = 0; 919 raw->tty = NULL; 920 } 921 922 /* 923 * Returns the amount of free space in the output buffer. 924 */ 925 static int 926 tty3215_write_room(struct tty_struct *tty) 927 { 928 struct raw3215_info *raw; 929 930 raw = (struct raw3215_info *) tty->driver_data; 931 932 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 933 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 934 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 935 else 936 return 0; 937 } 938 939 /* 940 * String write routine for 3215 ttys 941 */ 942 static int 943 tty3215_write(struct tty_struct * tty, 944 const unsigned char *buf, int count) 945 { 946 struct raw3215_info *raw; 947 948 if (!tty) 949 return 0; 950 raw = (struct raw3215_info *) tty->driver_data; 951 raw3215_write(raw, buf, count); 952 return count; 953 } 954 955 /* 956 * Put character routine for 3215 ttys 957 */ 958 static int 959 tty3215_put_char(struct tty_struct *tty, unsigned char ch) 960 { 961 struct raw3215_info *raw; 962 963 if (!tty) 964 return 0; 965 raw = (struct raw3215_info *) tty->driver_data; 966 raw3215_putchar(raw, ch); 967 return 1; 968 } 969 970 static void 971 tty3215_flush_chars(struct tty_struct *tty) 972 { 973 } 974 975 /* 976 * Returns the number of characters in the output buffer 977 */ 978 static int 979 tty3215_chars_in_buffer(struct tty_struct *tty) 980 { 981 struct raw3215_info *raw; 982 983 raw = (struct raw3215_info *) tty->driver_data; 984 return raw->count; 985 } 986 987 static void 988 tty3215_flush_buffer(struct tty_struct *tty) 989 { 990 struct raw3215_info *raw; 991 992 raw = (struct raw3215_info *) tty->driver_data; 993 raw3215_flush_buffer(raw); 994 tty_wakeup(tty); 995 } 996 997 /* 998 * Currently we don't have any io controls for 3215 ttys 999 */ 1000 static int 1001 tty3215_ioctl(struct tty_struct *tty, struct file * file, 1002 unsigned int cmd, unsigned long arg) 1003 { 1004 if (tty->flags & (1 << TTY_IO_ERROR)) 1005 return -EIO; 1006 1007 switch (cmd) { 1008 default: 1009 return -ENOIOCTLCMD; 1010 } 1011 return 0; 1012 } 1013 1014 /* 1015 * Disable reading from a 3215 tty 1016 */ 1017 static void 1018 tty3215_throttle(struct tty_struct * tty) 1019 { 1020 struct raw3215_info *raw; 1021 1022 raw = (struct raw3215_info *) tty->driver_data; 1023 raw->flags |= RAW3215_THROTTLED; 1024 } 1025 1026 /* 1027 * Enable reading from a 3215 tty 1028 */ 1029 static void 1030 tty3215_unthrottle(struct tty_struct * tty) 1031 { 1032 struct raw3215_info *raw; 1033 unsigned long flags; 1034 1035 raw = (struct raw3215_info *) tty->driver_data; 1036 if (raw->flags & RAW3215_THROTTLED) { 1037 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1038 raw->flags &= ~RAW3215_THROTTLED; 1039 raw3215_try_io(raw); 1040 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1041 } 1042 } 1043 1044 /* 1045 * Disable writing to a 3215 tty 1046 */ 1047 static void 1048 tty3215_stop(struct tty_struct *tty) 1049 { 1050 struct raw3215_info *raw; 1051 1052 raw = (struct raw3215_info *) tty->driver_data; 1053 raw->flags |= RAW3215_STOPPED; 1054 } 1055 1056 /* 1057 * Enable writing to a 3215 tty 1058 */ 1059 static void 1060 tty3215_start(struct tty_struct *tty) 1061 { 1062 struct raw3215_info *raw; 1063 unsigned long flags; 1064 1065 raw = (struct raw3215_info *) tty->driver_data; 1066 if (raw->flags & RAW3215_STOPPED) { 1067 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1068 raw->flags &= ~RAW3215_STOPPED; 1069 raw3215_try_io(raw); 1070 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1071 } 1072 } 1073 1074 static const struct tty_operations tty3215_ops = { 1075 .open = tty3215_open, 1076 .close = tty3215_close, 1077 .write = tty3215_write, 1078 .put_char = tty3215_put_char, 1079 .flush_chars = tty3215_flush_chars, 1080 .write_room = tty3215_write_room, 1081 .chars_in_buffer = tty3215_chars_in_buffer, 1082 .flush_buffer = tty3215_flush_buffer, 1083 .ioctl = tty3215_ioctl, 1084 .throttle = tty3215_throttle, 1085 .unthrottle = tty3215_unthrottle, 1086 .stop = tty3215_stop, 1087 .start = tty3215_start, 1088 }; 1089 1090 /* 1091 * 3215 tty registration code called from tty_init(). 1092 * Most kernel services (incl. kmalloc) are available at this poimt. 1093 */ 1094 static int __init 1095 tty3215_init(void) 1096 { 1097 struct tty_driver *driver; 1098 int ret; 1099 1100 if (!CONSOLE_IS_3215) 1101 return 0; 1102 1103 driver = alloc_tty_driver(NR_3215); 1104 if (!driver) 1105 return -ENOMEM; 1106 1107 ret = ccw_driver_register(&raw3215_ccw_driver); 1108 if (ret) { 1109 put_tty_driver(driver); 1110 return ret; 1111 } 1112 /* 1113 * Initialize the tty_driver structure 1114 * Entries in tty3215_driver that are NOT initialized: 1115 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1116 */ 1117 1118 driver->owner = THIS_MODULE; 1119 driver->driver_name = "tty3215"; 1120 driver->name = "ttyS"; 1121 driver->major = TTY_MAJOR; 1122 driver->minor_start = 64; 1123 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1124 driver->subtype = SYSTEM_TYPE_TTY; 1125 driver->init_termios = tty_std_termios; 1126 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1127 driver->init_termios.c_oflag = ONLCR | XTABS; 1128 driver->init_termios.c_lflag = ISIG; 1129 driver->flags = TTY_DRIVER_REAL_RAW; 1130 tty_set_operations(driver, &tty3215_ops); 1131 ret = tty_register_driver(driver); 1132 if (ret) { 1133 put_tty_driver(driver); 1134 return ret; 1135 } 1136 tty3215_driver = driver; 1137 return 0; 1138 } 1139 1140 static void __exit 1141 tty3215_exit(void) 1142 { 1143 tty_unregister_driver(tty3215_driver); 1144 put_tty_driver(tty3215_driver); 1145 ccw_driver_unregister(&raw3215_ccw_driver); 1146 } 1147 1148 module_init(tty3215_init); 1149 module_exit(tty3215_exit); 1150