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 #include <linux/reboot.h> 25 26 #include <linux/slab.h> 27 #include <linux/bootmem.h> 28 29 #include <asm/ccwdev.h> 30 #include <asm/cio.h> 31 #include <asm/io.h> 32 #include <asm/ebcdic.h> 33 #include <asm/uaccess.h> 34 #include <asm/delay.h> 35 #include <asm/cpcmd.h> 36 #include <asm/setup.h> 37 38 #include "ctrlchar.h" 39 40 #define NR_3215 1 41 #define NR_3215_REQ (4*NR_3215) 42 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ 43 #define RAW3215_INBUF_SIZE 256 /* input buffer size */ 44 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ 45 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ 46 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ 47 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ 48 #define RAW3215_NR_CCWS 3 49 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ 50 51 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ 52 #define RAW3215_ACTIVE 2 /* set if the device is in use */ 53 #define RAW3215_WORKING 4 /* set if a request is being worked on */ 54 #define RAW3215_THROTTLED 8 /* set if reading is disabled */ 55 #define RAW3215_STOPPED 16 /* set if writing is disabled */ 56 #define RAW3215_CLOSING 32 /* set while in close process */ 57 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ 58 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ 59 60 #define TAB_STOP_SIZE 8 /* tab stop size */ 61 62 /* 63 * Request types for a 3215 device 64 */ 65 enum raw3215_type { 66 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE 67 }; 68 69 /* 70 * Request structure for a 3215 device 71 */ 72 struct raw3215_req { 73 enum raw3215_type type; /* type of the request */ 74 int start, len; /* start index & len in output buffer */ 75 int delayable; /* indication to wait for more data */ 76 int residual; /* residual count for read request */ 77 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ 78 struct raw3215_info *info; /* pointer to main structure */ 79 struct raw3215_req *next; /* pointer to next request */ 80 } __attribute__ ((aligned(8))); 81 82 struct raw3215_info { 83 struct ccw_device *cdev; /* device for tty driver */ 84 spinlock_t *lock; /* pointer to irq lock */ 85 int flags; /* state flags */ 86 char *buffer; /* pointer to output buffer */ 87 char *inbuf; /* pointer to input buffer */ 88 int head; /* first free byte in output buffer */ 89 int count; /* number of bytes in output buffer */ 90 int written; /* number of bytes in write requests */ 91 struct tty_struct *tty; /* pointer to tty structure if present */ 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 * Try to start the next IO and wake up processes waiting on the tty. 345 */ 346 static void raw3215_next_io(struct raw3215_info *raw) 347 { 348 struct tty_struct *tty; 349 350 raw3215_mk_write_req(raw); 351 raw3215_try_io(raw); 352 tty = raw->tty; 353 if (tty != NULL && 354 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { 355 tty_wakeup(tty); 356 } 357 } 358 359 /* 360 * Interrupt routine, called from common io layer 361 */ 362 static void 363 raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 364 { 365 struct raw3215_info *raw; 366 struct raw3215_req *req; 367 struct tty_struct *tty; 368 int cstat, dstat; 369 int count; 370 371 raw = cdev->dev.driver_data; 372 req = (struct raw3215_req *) intparm; 373 cstat = irb->scsw.cmd.cstat; 374 dstat = irb->scsw.cmd.dstat; 375 if (cstat != 0) 376 raw3215_next_io(raw); 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); 387 break; 388 case 0x08: 389 case 0x0C: 390 /* Channel end interrupt. */ 391 if ((raw = req->info) == NULL) 392 return; /* 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 case 0x04: 400 /* Device end interrupt. */ 401 if ((raw = req->info) == NULL) 402 return; /* That shouldn't happen ... */ 403 if (req->type == RAW3215_READ && raw->tty != NULL) { 404 unsigned int cchar; 405 406 tty = raw->tty; 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(tty, cchar, TTY_NORMAL); 416 tty_flip_buffer_push(raw->tty); 417 break; 418 419 case CTRLCHAR_NONE: 420 if (count < 2 || 421 (strncmp(raw->inbuf+count-2, "\252n", 2) && 422 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 423 /* add the auto \n */ 424 raw->inbuf[count] = '\n'; 425 count++; 426 } else 427 count -= 2; 428 tty_insert_flip_string(tty, raw->inbuf, count); 429 tty_flip_buffer_push(raw->tty); 430 break; 431 } 432 } else if (req->type == RAW3215_WRITE) { 433 raw->count -= req->len; 434 raw->written -= req->len; 435 } 436 raw->flags &= ~RAW3215_WORKING; 437 raw3215_free_req(req); 438 /* check for empty wait */ 439 if (waitqueue_active(&raw->empty_wait) && 440 raw->queued_write == NULL && 441 raw->queued_read == NULL) { 442 wake_up_interruptible(&raw->empty_wait); 443 } 444 raw3215_next_io(raw); 445 break; 446 default: 447 /* Strange interrupt, I'll do my best to clean up */ 448 if (req != NULL && req->type != RAW3215_FREE) { 449 if (req->type == RAW3215_WRITE) { 450 raw->count -= req->len; 451 raw->written -= req->len; 452 } 453 raw->flags &= ~RAW3215_WORKING; 454 raw3215_free_req(req); 455 } 456 raw3215_next_io(raw); 457 } 458 return; 459 } 460 461 /* 462 * Wait until length bytes are available int the output buffer. 463 * Has to be called with the s390irq lock held. Can be called 464 * disabled. 465 */ 466 static void 467 raw3215_make_room(struct raw3215_info *raw, unsigned int length) 468 { 469 while (RAW3215_BUFFER_SIZE - raw->count < length) { 470 /* there might be a request pending */ 471 raw->flags |= RAW3215_FLUSHING; 472 raw3215_mk_write_req(raw); 473 raw3215_try_io(raw); 474 raw->flags &= ~RAW3215_FLUSHING; 475 #ifdef CONFIG_TN3215_CONSOLE 476 wait_cons_dev(); 477 #endif 478 /* Enough room freed up ? */ 479 if (RAW3215_BUFFER_SIZE - raw->count >= length) 480 break; 481 /* there might be another cpu waiting for the lock */ 482 spin_unlock(get_ccwdev_lock(raw->cdev)); 483 udelay(100); 484 spin_lock(get_ccwdev_lock(raw->cdev)); 485 } 486 } 487 488 /* 489 * String write routine for 3215 devices 490 */ 491 static void 492 raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length) 493 { 494 unsigned long flags; 495 int c, count; 496 497 while (length > 0) { 498 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 499 count = (length > RAW3215_BUFFER_SIZE) ? 500 RAW3215_BUFFER_SIZE : length; 501 length -= count; 502 503 raw3215_make_room(raw, count); 504 505 /* copy string to output buffer and convert it to EBCDIC */ 506 while (1) { 507 c = min_t(int, count, 508 min(RAW3215_BUFFER_SIZE - raw->count, 509 RAW3215_BUFFER_SIZE - raw->head)); 510 if (c <= 0) 511 break; 512 memcpy(raw->buffer + raw->head, str, c); 513 ASCEBC(raw->buffer + raw->head, c); 514 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 515 raw->count += c; 516 raw->line_pos += c; 517 str += c; 518 count -= c; 519 } 520 if (!(raw->flags & RAW3215_WORKING)) { 521 raw3215_mk_write_req(raw); 522 /* start or queue request */ 523 raw3215_try_io(raw); 524 } 525 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 526 } 527 } 528 529 /* 530 * Put character routine for 3215 devices 531 */ 532 static void 533 raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 534 { 535 unsigned long flags; 536 unsigned int length, i; 537 538 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 539 if (ch == '\t') { 540 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 541 raw->line_pos += length; 542 ch = ' '; 543 } else if (ch == '\n') { 544 length = 1; 545 raw->line_pos = 0; 546 } else { 547 length = 1; 548 raw->line_pos++; 549 } 550 raw3215_make_room(raw, length); 551 552 for (i = 0; i < length; i++) { 553 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 554 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 555 raw->count++; 556 } 557 if (!(raw->flags & RAW3215_WORKING)) { 558 raw3215_mk_write_req(raw); 559 /* start or queue request */ 560 raw3215_try_io(raw); 561 } 562 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 563 } 564 565 /* 566 * Flush routine, it simply sets the flush flag and tries to start 567 * pending IO. 568 */ 569 static void 570 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 587 raw3215_startup(struct raw3215_info *raw) 588 { 589 unsigned long flags; 590 591 if (raw->flags & RAW3215_ACTIVE) 592 return 0; 593 raw->line_pos = 0; 594 raw->flags |= RAW3215_ACTIVE; 595 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 596 raw3215_try_io(raw); 597 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 598 599 return 0; 600 } 601 602 /* 603 * Shutdown a 3215 device. 604 */ 605 static void 606 raw3215_shutdown(struct raw3215_info *raw) 607 { 608 DECLARE_WAITQUEUE(wait, current); 609 unsigned long flags; 610 611 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) 612 return; 613 /* Wait for outstanding requests, then free irq */ 614 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 615 if ((raw->flags & RAW3215_WORKING) || 616 raw->queued_write != NULL || 617 raw->queued_read != NULL) { 618 raw->flags |= RAW3215_CLOSING; 619 add_wait_queue(&raw->empty_wait, &wait); 620 set_current_state(TASK_INTERRUPTIBLE); 621 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 622 schedule(); 623 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 624 remove_wait_queue(&raw->empty_wait, &wait); 625 set_current_state(TASK_RUNNING); 626 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); 627 } 628 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 629 } 630 631 static int 632 raw3215_probe (struct ccw_device *cdev) 633 { 634 struct raw3215_info *raw; 635 int line; 636 637 /* Console is special. */ 638 if (raw3215[0] && (cdev->dev.driver_data == raw3215[0])) 639 return 0; 640 raw = kmalloc(sizeof(struct raw3215_info) + 641 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); 642 if (raw == NULL) 643 return -ENOMEM; 644 645 spin_lock(&raw3215_device_lock); 646 for (line = 0; line < NR_3215; line++) { 647 if (!raw3215[line]) { 648 raw3215[line] = raw; 649 break; 650 } 651 } 652 spin_unlock(&raw3215_device_lock); 653 if (line == NR_3215) { 654 kfree(raw); 655 return -ENODEV; 656 } 657 658 raw->cdev = cdev; 659 raw->inbuf = (char *) raw + sizeof(struct raw3215_info); 660 memset(raw, 0, sizeof(struct raw3215_info)); 661 raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, 662 GFP_KERNEL|GFP_DMA); 663 if (raw->buffer == NULL) { 664 spin_lock(&raw3215_device_lock); 665 raw3215[line] = NULL; 666 spin_unlock(&raw3215_device_lock); 667 kfree(raw); 668 return -ENOMEM; 669 } 670 init_waitqueue_head(&raw->empty_wait); 671 672 cdev->dev.driver_data = raw; 673 cdev->handler = raw3215_irq; 674 675 return 0; 676 } 677 678 static void 679 raw3215_remove (struct ccw_device *cdev) 680 { 681 struct raw3215_info *raw; 682 683 ccw_device_set_offline(cdev); 684 raw = cdev->dev.driver_data; 685 if (raw) { 686 cdev->dev.driver_data = NULL; 687 kfree(raw->buffer); 688 kfree(raw); 689 } 690 } 691 692 static int 693 raw3215_set_online (struct ccw_device *cdev) 694 { 695 struct raw3215_info *raw; 696 697 raw = cdev->dev.driver_data; 698 if (!raw) 699 return -ENODEV; 700 701 return raw3215_startup(raw); 702 } 703 704 static int 705 raw3215_set_offline (struct ccw_device *cdev) 706 { 707 struct raw3215_info *raw; 708 709 raw = cdev->dev.driver_data; 710 if (!raw) 711 return -ENODEV; 712 713 raw3215_shutdown(raw); 714 715 return 0; 716 } 717 718 static struct ccw_device_id raw3215_id[] = { 719 { CCW_DEVICE(0x3215, 0) }, 720 { /* end of list */ }, 721 }; 722 723 static struct ccw_driver raw3215_ccw_driver = { 724 .name = "3215", 725 .owner = THIS_MODULE, 726 .ids = raw3215_id, 727 .probe = &raw3215_probe, 728 .remove = &raw3215_remove, 729 .set_online = &raw3215_set_online, 730 .set_offline = &raw3215_set_offline, 731 }; 732 733 #ifdef CONFIG_TN3215_CONSOLE 734 /* 735 * Write a string to the 3215 console 736 */ 737 static void 738 con3215_write(struct console *co, const char *str, unsigned int count) 739 { 740 struct raw3215_info *raw; 741 int i; 742 743 if (count <= 0) 744 return; 745 raw = raw3215[0]; /* console 3215 is the first one */ 746 while (count > 0) { 747 for (i = 0; i < count; i++) 748 if (str[i] == '\t' || str[i] == '\n') 749 break; 750 raw3215_write(raw, str, i); 751 count -= i; 752 str += i; 753 if (count > 0) { 754 raw3215_putchar(raw, *str); 755 count--; 756 str++; 757 } 758 } 759 } 760 761 static struct tty_driver *con3215_device(struct console *c, int *index) 762 { 763 *index = c->index; 764 return tty3215_driver; 765 } 766 767 /* 768 * panic() calls con3215_flush through a panic_notifier 769 * before the system enters a disabled, endless loop. 770 */ 771 static void 772 con3215_flush(void) 773 { 774 struct raw3215_info *raw; 775 unsigned long flags; 776 777 raw = raw3215[0]; /* console 3215 is the first one */ 778 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 779 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 780 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 781 } 782 783 static int con3215_notify(struct notifier_block *self, 784 unsigned long event, void *data) 785 { 786 con3215_flush(); 787 return NOTIFY_OK; 788 } 789 790 static struct notifier_block on_panic_nb = { 791 .notifier_call = con3215_notify, 792 .priority = 0, 793 }; 794 795 static struct notifier_block on_reboot_nb = { 796 .notifier_call = con3215_notify, 797 .priority = 0, 798 }; 799 800 /* 801 * The console structure for the 3215 console 802 */ 803 static struct console con3215 = { 804 .name = "ttyS", 805 .write = con3215_write, 806 .device = con3215_device, 807 .flags = CON_PRINTBUFFER, 808 }; 809 810 /* 811 * 3215 console initialization code called from console_init(). 812 * NOTE: This is called before kmalloc is available. 813 */ 814 static int __init 815 con3215_init(void) 816 { 817 struct ccw_device *cdev; 818 struct raw3215_info *raw; 819 struct raw3215_req *req; 820 int i; 821 822 /* Check if 3215 is to be the console */ 823 if (!CONSOLE_IS_3215) 824 return -ENODEV; 825 826 /* Set the console mode for VM */ 827 if (MACHINE_IS_VM) { 828 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 829 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 830 } 831 832 /* allocate 3215 request structures */ 833 raw3215_freelist = NULL; 834 spin_lock_init(&raw3215_freelist_lock); 835 for (i = 0; i < NR_3215_REQ; i++) { 836 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); 837 req->next = raw3215_freelist; 838 raw3215_freelist = req; 839 } 840 841 cdev = ccw_device_probe_console(); 842 if (IS_ERR(cdev)) 843 return -ENODEV; 844 845 raw3215[0] = raw = (struct raw3215_info *) 846 alloc_bootmem_low(sizeof(struct raw3215_info)); 847 memset(raw, 0, sizeof(struct raw3215_info)); 848 raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); 849 raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); 850 raw->cdev = cdev; 851 cdev->dev.driver_data = raw; 852 cdev->handler = raw3215_irq; 853 854 raw->flags |= RAW3215_FIXED; 855 init_waitqueue_head(&raw->empty_wait); 856 857 /* Request the console irq */ 858 if (raw3215_startup(raw) != 0) { 859 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); 860 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); 861 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info)); 862 raw3215[0] = NULL; 863 return -ENODEV; 864 } 865 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 866 register_reboot_notifier(&on_reboot_nb); 867 register_console(&con3215); 868 return 0; 869 } 870 console_initcall(con3215_init); 871 #endif 872 873 /* 874 * tty3215_open 875 * 876 * This routine is called whenever a 3215 tty is opened. 877 */ 878 static int 879 tty3215_open(struct tty_struct *tty, struct file * filp) 880 { 881 struct raw3215_info *raw; 882 int retval, line; 883 884 line = tty->index; 885 if ((line < 0) || (line >= NR_3215)) 886 return -ENODEV; 887 888 raw = raw3215[line]; 889 if (raw == NULL) 890 return -ENODEV; 891 892 tty->driver_data = raw; 893 raw->tty = tty; 894 895 tty->low_latency = 0; /* don't use bottom half for pushing chars */ 896 /* 897 * Start up 3215 device 898 */ 899 retval = raw3215_startup(raw); 900 if (retval) 901 return retval; 902 903 return 0; 904 } 905 906 /* 907 * tty3215_close() 908 * 909 * This routine is called when the 3215 tty is closed. We wait 910 * for the remaining request to be completed. Then we clean up. 911 */ 912 static void 913 tty3215_close(struct tty_struct *tty, struct file * filp) 914 { 915 struct raw3215_info *raw; 916 917 raw = (struct raw3215_info *) tty->driver_data; 918 if (raw == NULL || tty->count > 1) 919 return; 920 tty->closing = 1; 921 /* Shutdown the terminal */ 922 raw3215_shutdown(raw); 923 tty->closing = 0; 924 raw->tty = NULL; 925 } 926 927 /* 928 * Returns the amount of free space in the output buffer. 929 */ 930 static int 931 tty3215_write_room(struct tty_struct *tty) 932 { 933 struct raw3215_info *raw; 934 935 raw = (struct raw3215_info *) tty->driver_data; 936 937 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 938 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 939 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 940 else 941 return 0; 942 } 943 944 /* 945 * String write routine for 3215 ttys 946 */ 947 static int 948 tty3215_write(struct tty_struct * tty, 949 const unsigned char *buf, int count) 950 { 951 struct raw3215_info *raw; 952 953 if (!tty) 954 return 0; 955 raw = (struct raw3215_info *) tty->driver_data; 956 raw3215_write(raw, buf, count); 957 return count; 958 } 959 960 /* 961 * Put character routine for 3215 ttys 962 */ 963 static int 964 tty3215_put_char(struct tty_struct *tty, unsigned char ch) 965 { 966 struct raw3215_info *raw; 967 968 if (!tty) 969 return 0; 970 raw = (struct raw3215_info *) tty->driver_data; 971 raw3215_putchar(raw, ch); 972 return 1; 973 } 974 975 static void 976 tty3215_flush_chars(struct tty_struct *tty) 977 { 978 } 979 980 /* 981 * Returns the number of characters in the output buffer 982 */ 983 static int 984 tty3215_chars_in_buffer(struct tty_struct *tty) 985 { 986 struct raw3215_info *raw; 987 988 raw = (struct raw3215_info *) tty->driver_data; 989 return raw->count; 990 } 991 992 static void 993 tty3215_flush_buffer(struct tty_struct *tty) 994 { 995 struct raw3215_info *raw; 996 997 raw = (struct raw3215_info *) tty->driver_data; 998 raw3215_flush_buffer(raw); 999 tty_wakeup(tty); 1000 } 1001 1002 /* 1003 * Currently we don't have any io controls for 3215 ttys 1004 */ 1005 static int 1006 tty3215_ioctl(struct tty_struct *tty, struct file * file, 1007 unsigned int cmd, unsigned long arg) 1008 { 1009 if (tty->flags & (1 << TTY_IO_ERROR)) 1010 return -EIO; 1011 1012 switch (cmd) { 1013 default: 1014 return -ENOIOCTLCMD; 1015 } 1016 return 0; 1017 } 1018 1019 /* 1020 * Disable reading from a 3215 tty 1021 */ 1022 static void 1023 tty3215_throttle(struct tty_struct * tty) 1024 { 1025 struct raw3215_info *raw; 1026 1027 raw = (struct raw3215_info *) tty->driver_data; 1028 raw->flags |= RAW3215_THROTTLED; 1029 } 1030 1031 /* 1032 * Enable reading from a 3215 tty 1033 */ 1034 static void 1035 tty3215_unthrottle(struct tty_struct * tty) 1036 { 1037 struct raw3215_info *raw; 1038 unsigned long flags; 1039 1040 raw = (struct raw3215_info *) tty->driver_data; 1041 if (raw->flags & RAW3215_THROTTLED) { 1042 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1043 raw->flags &= ~RAW3215_THROTTLED; 1044 raw3215_try_io(raw); 1045 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1046 } 1047 } 1048 1049 /* 1050 * Disable writing to a 3215 tty 1051 */ 1052 static void 1053 tty3215_stop(struct tty_struct *tty) 1054 { 1055 struct raw3215_info *raw; 1056 1057 raw = (struct raw3215_info *) tty->driver_data; 1058 raw->flags |= RAW3215_STOPPED; 1059 } 1060 1061 /* 1062 * Enable writing to a 3215 tty 1063 */ 1064 static void 1065 tty3215_start(struct tty_struct *tty) 1066 { 1067 struct raw3215_info *raw; 1068 unsigned long flags; 1069 1070 raw = (struct raw3215_info *) tty->driver_data; 1071 if (raw->flags & RAW3215_STOPPED) { 1072 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1073 raw->flags &= ~RAW3215_STOPPED; 1074 raw3215_try_io(raw); 1075 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1076 } 1077 } 1078 1079 static const struct tty_operations tty3215_ops = { 1080 .open = tty3215_open, 1081 .close = tty3215_close, 1082 .write = tty3215_write, 1083 .put_char = tty3215_put_char, 1084 .flush_chars = tty3215_flush_chars, 1085 .write_room = tty3215_write_room, 1086 .chars_in_buffer = tty3215_chars_in_buffer, 1087 .flush_buffer = tty3215_flush_buffer, 1088 .ioctl = tty3215_ioctl, 1089 .throttle = tty3215_throttle, 1090 .unthrottle = tty3215_unthrottle, 1091 .stop = tty3215_stop, 1092 .start = tty3215_start, 1093 }; 1094 1095 /* 1096 * 3215 tty registration code called from tty_init(). 1097 * Most kernel services (incl. kmalloc) are available at this poimt. 1098 */ 1099 static int __init 1100 tty3215_init(void) 1101 { 1102 struct tty_driver *driver; 1103 int ret; 1104 1105 if (!CONSOLE_IS_3215) 1106 return 0; 1107 1108 driver = alloc_tty_driver(NR_3215); 1109 if (!driver) 1110 return -ENOMEM; 1111 1112 ret = ccw_driver_register(&raw3215_ccw_driver); 1113 if (ret) { 1114 put_tty_driver(driver); 1115 return ret; 1116 } 1117 /* 1118 * Initialize the tty_driver structure 1119 * Entries in tty3215_driver that are NOT initialized: 1120 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1121 */ 1122 1123 driver->owner = THIS_MODULE; 1124 driver->driver_name = "tty3215"; 1125 driver->name = "ttyS"; 1126 driver->major = TTY_MAJOR; 1127 driver->minor_start = 64; 1128 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1129 driver->subtype = SYSTEM_TYPE_TTY; 1130 driver->init_termios = tty_std_termios; 1131 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1132 driver->init_termios.c_oflag = ONLCR | XTABS; 1133 driver->init_termios.c_lflag = ISIG; 1134 driver->flags = TTY_DRIVER_REAL_RAW; 1135 tty_set_operations(driver, &tty3215_ops); 1136 ret = tty_register_driver(driver); 1137 if (ret) { 1138 put_tty_driver(driver); 1139 return ret; 1140 } 1141 tty3215_driver = driver; 1142 return 0; 1143 } 1144 1145 static void __exit 1146 tty3215_exit(void) 1147 { 1148 tty_unregister_driver(tty3215_driver); 1149 put_tty_driver(tty3215_driver); 1150 ccw_driver_unregister(&raw3215_ccw_driver); 1151 } 1152 1153 module_init(tty3215_init); 1154 module_exit(tty3215_exit); 1155