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 char *message; /* pending message from raw3215_irq */ 97 int msg_dstat; /* dstat for pending message */ 98 int msg_cstat; /* cstat for pending message */ 99 int line_pos; /* position on the line (for tabs) */ 100 char ubuffer[80]; /* copy_from_user buffer */ 101 }; 102 103 /* array of 3215 devices structures */ 104 static struct raw3215_info *raw3215[NR_3215]; 105 /* spinlock to protect the raw3215 array */ 106 static DEFINE_SPINLOCK(raw3215_device_lock); 107 /* list of free request structures */ 108 static struct raw3215_req *raw3215_freelist; 109 /* spinlock to protect free list */ 110 static spinlock_t raw3215_freelist_lock; 111 112 static struct tty_driver *tty3215_driver; 113 114 /* 115 * Get a request structure from the free list 116 */ 117 static inline struct raw3215_req * 118 raw3215_alloc_req(void) { 119 struct raw3215_req *req; 120 unsigned long flags; 121 122 spin_lock_irqsave(&raw3215_freelist_lock, flags); 123 req = raw3215_freelist; 124 raw3215_freelist = req->next; 125 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 126 return req; 127 } 128 129 /* 130 * Put a request structure back to the free list 131 */ 132 static inline void 133 raw3215_free_req(struct raw3215_req *req) { 134 unsigned long flags; 135 136 if (req->type == RAW3215_FREE) 137 return; /* don't free a free request */ 138 req->type = RAW3215_FREE; 139 spin_lock_irqsave(&raw3215_freelist_lock, flags); 140 req->next = raw3215_freelist; 141 raw3215_freelist = req; 142 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 143 } 144 145 /* 146 * Set up a read request that reads up to 160 byte from the 3215 device. 147 * If there is a queued read request it is used, but that shouldn't happen 148 * because a 3215 terminal won't accept a new read before the old one is 149 * completed. 150 */ 151 static void 152 raw3215_mk_read_req(struct raw3215_info *raw) 153 { 154 struct raw3215_req *req; 155 struct ccw1 *ccw; 156 157 /* there can only be ONE read request at a time */ 158 req = raw->queued_read; 159 if (req == NULL) { 160 /* no queued read request, use new req structure */ 161 req = raw3215_alloc_req(); 162 req->type = RAW3215_READ; 163 req->info = raw; 164 raw->queued_read = req; 165 } 166 167 ccw = req->ccws; 168 ccw->cmd_code = 0x0A; /* read inquiry */ 169 ccw->flags = 0x20; /* ignore incorrect length */ 170 ccw->count = 160; 171 ccw->cda = (__u32) __pa(raw->inbuf); 172 } 173 174 /* 175 * Set up a write request with the information from the main structure. 176 * A ccw chain is created that writes as much as possible from the output 177 * buffer to the 3215 device. If a queued write exists it is replaced by 178 * the new, probably lengthened request. 179 */ 180 static void 181 raw3215_mk_write_req(struct raw3215_info *raw) 182 { 183 struct raw3215_req *req; 184 struct ccw1 *ccw; 185 int len, count, ix, lines; 186 187 if (raw->count <= raw->written) 188 return; 189 /* check if there is a queued write request */ 190 req = raw->queued_write; 191 if (req == NULL) { 192 /* no queued write request, use new req structure */ 193 req = raw3215_alloc_req(); 194 req->type = RAW3215_WRITE; 195 req->info = raw; 196 raw->queued_write = req; 197 } else { 198 raw->written -= req->len; 199 } 200 201 ccw = req->ccws; 202 req->start = (raw->head - raw->count + raw->written) & 203 (RAW3215_BUFFER_SIZE - 1); 204 /* 205 * now we have to count newlines. We can at max accept 206 * RAW3215_MAX_NEWLINE newlines in a single ssch due to 207 * a restriction in VM 208 */ 209 lines = 0; 210 ix = req->start; 211 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { 212 if (raw->buffer[ix] == 0x15) 213 lines++; 214 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 215 } 216 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; 217 if (len > RAW3215_MAX_BYTES) 218 len = RAW3215_MAX_BYTES; 219 req->len = len; 220 raw->written += len; 221 222 /* set the indication if we should try to enlarge this request */ 223 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); 224 225 ix = req->start; 226 while (len > 0) { 227 if (ccw > req->ccws) 228 ccw[-1].flags |= 0x40; /* use command chaining */ 229 ccw->cmd_code = 0x01; /* write, auto carrier return */ 230 ccw->flags = 0x20; /* ignore incorrect length ind. */ 231 ccw->cda = 232 (__u32) __pa(raw->buffer + ix); 233 count = len; 234 if (ix + count > RAW3215_BUFFER_SIZE) 235 count = RAW3215_BUFFER_SIZE - ix; 236 ccw->count = count; 237 len -= count; 238 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); 239 ccw++; 240 } 241 /* 242 * Add a NOP to the channel program. 3215 devices are purely 243 * emulated and its much better to avoid the channel end 244 * interrupt in this case. 245 */ 246 if (ccw > req->ccws) 247 ccw[-1].flags |= 0x40; /* use command chaining */ 248 ccw->cmd_code = 0x03; /* NOP */ 249 ccw->flags = 0; 250 ccw->cda = 0; 251 ccw->count = 1; 252 } 253 254 /* 255 * Start a read or a write request 256 */ 257 static void 258 raw3215_start_io(struct raw3215_info *raw) 259 { 260 struct raw3215_req *req; 261 int res; 262 263 req = raw->queued_read; 264 if (req != NULL && 265 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { 266 /* dequeue request */ 267 raw->queued_read = NULL; 268 res = ccw_device_start(raw->cdev, req->ccws, 269 (unsigned long) req, 0, 0); 270 if (res != 0) { 271 /* do_IO failed, put request back to queue */ 272 raw->queued_read = req; 273 } else { 274 raw->flags |= RAW3215_WORKING; 275 } 276 } 277 req = raw->queued_write; 278 if (req != NULL && 279 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { 280 /* dequeue request */ 281 raw->queued_write = NULL; 282 res = ccw_device_start(raw->cdev, req->ccws, 283 (unsigned long) req, 0, 0); 284 if (res != 0) { 285 /* do_IO failed, put request back to queue */ 286 raw->queued_write = req; 287 } else { 288 raw->flags |= RAW3215_WORKING; 289 } 290 } 291 } 292 293 /* 294 * Function to start a delayed output after RAW3215_TIMEOUT seconds 295 */ 296 static void 297 raw3215_timeout(unsigned long __data) 298 { 299 struct raw3215_info *raw = (struct raw3215_info *) __data; 300 unsigned long flags; 301 302 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 303 if (raw->flags & RAW3215_TIMER_RUNS) { 304 del_timer(&raw->timer); 305 raw->flags &= ~RAW3215_TIMER_RUNS; 306 raw3215_mk_write_req(raw); 307 raw3215_start_io(raw); 308 } 309 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 310 } 311 312 /* 313 * Function to conditionally start an IO. A read is started immediately, 314 * a write is only started immediately if the flush flag is on or the 315 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not 316 * done immediately a timer is started with a delay of RAW3215_TIMEOUT. 317 */ 318 static inline void 319 raw3215_try_io(struct raw3215_info *raw) 320 { 321 if (!(raw->flags & RAW3215_ACTIVE)) 322 return; 323 if (raw->queued_read != NULL) 324 raw3215_start_io(raw); 325 else if (raw->queued_write != NULL) { 326 if ((raw->queued_write->delayable == 0) || 327 (raw->flags & RAW3215_FLUSHING)) { 328 /* execute write requests bigger than minimum size */ 329 raw3215_start_io(raw); 330 if (raw->flags & RAW3215_TIMER_RUNS) { 331 del_timer(&raw->timer); 332 raw->flags &= ~RAW3215_TIMER_RUNS; 333 } 334 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { 335 /* delay small writes */ 336 init_timer(&raw->timer); 337 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 338 raw->timer.data = (unsigned long) raw; 339 raw->timer.function = raw3215_timeout; 340 add_timer(&raw->timer); 341 raw->flags |= RAW3215_TIMER_RUNS; 342 } 343 } 344 } 345 346 /* 347 * The bottom half handler routine for 3215 devices. It tries to start 348 * the next IO and wakes up processes waiting on the tty. 349 */ 350 static void 351 raw3215_tasklet(void *data) 352 { 353 struct raw3215_info *raw; 354 struct tty_struct *tty; 355 unsigned long flags; 356 357 raw = (struct raw3215_info *) data; 358 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 359 raw3215_mk_write_req(raw); 360 raw3215_try_io(raw); 361 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 362 /* Check for pending message from raw3215_irq */ 363 if (raw->message != NULL) { 364 printk(raw->message, raw->msg_dstat, raw->msg_cstat); 365 raw->message = NULL; 366 } 367 tty = raw->tty; 368 if (tty != NULL && 369 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { 370 tty_wakeup(tty); 371 } 372 } 373 374 /* 375 * Interrupt routine, called from common io layer 376 */ 377 static void 378 raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 379 { 380 struct raw3215_info *raw; 381 struct raw3215_req *req; 382 struct tty_struct *tty; 383 int cstat, dstat; 384 int count, slen; 385 386 raw = cdev->dev.driver_data; 387 req = (struct raw3215_req *) intparm; 388 cstat = irb->scsw.cstat; 389 dstat = irb->scsw.dstat; 390 if (cstat != 0) { 391 raw->message = KERN_WARNING 392 "Got nonzero channel status in raw3215_irq " 393 "(dev sts 0x%2x, sch sts 0x%2x)"; 394 raw->msg_dstat = dstat; 395 raw->msg_cstat = cstat; 396 tasklet_schedule(&raw->tasklet); 397 } 398 if (dstat & 0x01) { /* we got a unit exception */ 399 dstat &= ~0x01; /* we can ignore it */ 400 } 401 switch (dstat) { 402 case 0x80: 403 if (cstat != 0) 404 break; 405 /* Attention interrupt, someone hit the enter key */ 406 raw3215_mk_read_req(raw); 407 if (MACHINE_IS_P390) 408 memset(raw->inbuf, 0, RAW3215_INBUF_SIZE); 409 tasklet_schedule(&raw->tasklet); 410 break; 411 case 0x08: 412 case 0x0C: 413 /* Channel end interrupt. */ 414 if ((raw = req->info) == NULL) 415 return; /* That shouldn't happen ... */ 416 if (req->type == RAW3215_READ) { 417 /* store residual count, then wait for device end */ 418 req->residual = irb->scsw.count; 419 } 420 if (dstat == 0x08) 421 break; 422 case 0x04: 423 /* Device end interrupt. */ 424 if ((raw = req->info) == NULL) 425 return; /* That shouldn't happen ... */ 426 if (req->type == RAW3215_READ && raw->tty != NULL) { 427 unsigned int cchar; 428 429 tty = raw->tty; 430 count = 160 - req->residual; 431 if (MACHINE_IS_P390) { 432 slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE); 433 if (count > slen) 434 count = slen; 435 } else 436 EBCASC(raw->inbuf, count); 437 cchar = ctrlchar_handle(raw->inbuf, count, tty); 438 switch (cchar & CTRLCHAR_MASK) { 439 case CTRLCHAR_SYSRQ: 440 break; 441 442 case CTRLCHAR_CTRL: 443 tty_insert_flip_char(tty, cchar, TTY_NORMAL); 444 tty_flip_buffer_push(raw->tty); 445 break; 446 447 case CTRLCHAR_NONE: 448 if (count < 2 || 449 (strncmp(raw->inbuf+count-2, "\252n", 2) && 450 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 451 /* add the auto \n */ 452 raw->inbuf[count] = '\n'; 453 count++; 454 } else 455 count -= 2; 456 tty_insert_flip_string(tty, raw->inbuf, count); 457 tty_flip_buffer_push(raw->tty); 458 break; 459 } 460 } else if (req->type == RAW3215_WRITE) { 461 raw->count -= req->len; 462 raw->written -= req->len; 463 } 464 raw->flags &= ~RAW3215_WORKING; 465 raw3215_free_req(req); 466 /* check for empty wait */ 467 if (waitqueue_active(&raw->empty_wait) && 468 raw->queued_write == NULL && 469 raw->queued_read == NULL) { 470 wake_up_interruptible(&raw->empty_wait); 471 } 472 tasklet_schedule(&raw->tasklet); 473 break; 474 default: 475 /* Strange interrupt, I'll do my best to clean up */ 476 if (req != NULL && req->type != RAW3215_FREE) { 477 if (req->type == RAW3215_WRITE) { 478 raw->count -= req->len; 479 raw->written -= req->len; 480 } 481 raw->flags &= ~RAW3215_WORKING; 482 raw3215_free_req(req); 483 } 484 raw->message = KERN_WARNING 485 "Spurious interrupt in in raw3215_irq " 486 "(dev sts 0x%2x, sch sts 0x%2x)"; 487 raw->msg_dstat = dstat; 488 raw->msg_cstat = cstat; 489 tasklet_schedule(&raw->tasklet); 490 } 491 return; 492 } 493 494 /* 495 * Wait until length bytes are available int the output buffer. 496 * Has to be called with the s390irq lock held. Can be called 497 * disabled. 498 */ 499 static void 500 raw3215_make_room(struct raw3215_info *raw, unsigned int length) 501 { 502 while (RAW3215_BUFFER_SIZE - raw->count < length) { 503 /* there might be a request pending */ 504 raw->flags |= RAW3215_FLUSHING; 505 raw3215_mk_write_req(raw); 506 raw3215_try_io(raw); 507 raw->flags &= ~RAW3215_FLUSHING; 508 #ifdef CONFIG_TN3215_CONSOLE 509 wait_cons_dev(); 510 #endif 511 /* Enough room freed up ? */ 512 if (RAW3215_BUFFER_SIZE - raw->count >= length) 513 break; 514 /* there might be another cpu waiting for the lock */ 515 spin_unlock(get_ccwdev_lock(raw->cdev)); 516 udelay(100); 517 spin_lock(get_ccwdev_lock(raw->cdev)); 518 } 519 } 520 521 /* 522 * String write routine for 3215 devices 523 */ 524 static void 525 raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length) 526 { 527 unsigned long flags; 528 int c, count; 529 530 while (length > 0) { 531 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 532 count = (length > RAW3215_BUFFER_SIZE) ? 533 RAW3215_BUFFER_SIZE : length; 534 length -= count; 535 536 raw3215_make_room(raw, count); 537 538 /* copy string to output buffer and convert it to EBCDIC */ 539 while (1) { 540 c = min_t(int, count, 541 min(RAW3215_BUFFER_SIZE - raw->count, 542 RAW3215_BUFFER_SIZE - raw->head)); 543 if (c <= 0) 544 break; 545 memcpy(raw->buffer + raw->head, str, c); 546 ASCEBC(raw->buffer + raw->head, c); 547 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 548 raw->count += c; 549 raw->line_pos += c; 550 str += c; 551 count -= c; 552 } 553 if (!(raw->flags & RAW3215_WORKING)) { 554 raw3215_mk_write_req(raw); 555 /* start or queue request */ 556 raw3215_try_io(raw); 557 } 558 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 559 } 560 } 561 562 /* 563 * Put character routine for 3215 devices 564 */ 565 static void 566 raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 567 { 568 unsigned long flags; 569 unsigned int length, i; 570 571 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 572 if (ch == '\t') { 573 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 574 raw->line_pos += length; 575 ch = ' '; 576 } else if (ch == '\n') { 577 length = 1; 578 raw->line_pos = 0; 579 } else { 580 length = 1; 581 raw->line_pos++; 582 } 583 raw3215_make_room(raw, length); 584 585 for (i = 0; i < length; i++) { 586 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 587 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 588 raw->count++; 589 } 590 if (!(raw->flags & RAW3215_WORKING)) { 591 raw3215_mk_write_req(raw); 592 /* start or queue request */ 593 raw3215_try_io(raw); 594 } 595 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 596 } 597 598 /* 599 * Flush routine, it simply sets the flush flag and tries to start 600 * pending IO. 601 */ 602 static void 603 raw3215_flush_buffer(struct raw3215_info *raw) 604 { 605 unsigned long flags; 606 607 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 608 if (raw->count > 0) { 609 raw->flags |= RAW3215_FLUSHING; 610 raw3215_try_io(raw); 611 raw->flags &= ~RAW3215_FLUSHING; 612 } 613 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 614 } 615 616 /* 617 * Fire up a 3215 device. 618 */ 619 static int 620 raw3215_startup(struct raw3215_info *raw) 621 { 622 unsigned long flags; 623 624 if (raw->flags & RAW3215_ACTIVE) 625 return 0; 626 raw->line_pos = 0; 627 raw->flags |= RAW3215_ACTIVE; 628 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 629 raw3215_try_io(raw); 630 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 631 632 return 0; 633 } 634 635 /* 636 * Shutdown a 3215 device. 637 */ 638 static void 639 raw3215_shutdown(struct raw3215_info *raw) 640 { 641 DECLARE_WAITQUEUE(wait, current); 642 unsigned long flags; 643 644 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) 645 return; 646 /* Wait for outstanding requests, then free irq */ 647 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 648 if ((raw->flags & RAW3215_WORKING) || 649 raw->queued_write != NULL || 650 raw->queued_read != NULL) { 651 raw->flags |= RAW3215_CLOSING; 652 add_wait_queue(&raw->empty_wait, &wait); 653 set_current_state(TASK_INTERRUPTIBLE); 654 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 655 schedule(); 656 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 657 remove_wait_queue(&raw->empty_wait, &wait); 658 set_current_state(TASK_RUNNING); 659 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); 660 } 661 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 662 } 663 664 static int 665 raw3215_probe (struct ccw_device *cdev) 666 { 667 struct raw3215_info *raw; 668 int line; 669 670 /* Console is special. */ 671 if (raw3215[0] && (cdev->dev.driver_data == raw3215[0])) 672 return 0; 673 raw = kmalloc(sizeof(struct raw3215_info) + 674 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); 675 if (raw == NULL) 676 return -ENOMEM; 677 678 spin_lock(&raw3215_device_lock); 679 for (line = 0; line < NR_3215; line++) { 680 if (!raw3215[line]) { 681 raw3215[line] = raw; 682 break; 683 } 684 } 685 spin_unlock(&raw3215_device_lock); 686 if (line == NR_3215) { 687 kfree(raw); 688 return -ENODEV; 689 } 690 691 raw->cdev = cdev; 692 raw->inbuf = (char *) raw + sizeof(struct raw3215_info); 693 memset(raw, 0, sizeof(struct raw3215_info)); 694 raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, 695 GFP_KERNEL|GFP_DMA); 696 if (raw->buffer == NULL) { 697 spin_lock(&raw3215_device_lock); 698 raw3215[line] = NULL; 699 spin_unlock(&raw3215_device_lock); 700 kfree(raw); 701 return -ENOMEM; 702 } 703 tasklet_init(&raw->tasklet, 704 (void (*)(unsigned long)) raw3215_tasklet, 705 (unsigned long) raw); 706 init_waitqueue_head(&raw->empty_wait); 707 708 cdev->dev.driver_data = raw; 709 cdev->handler = raw3215_irq; 710 711 return 0; 712 } 713 714 static void 715 raw3215_remove (struct ccw_device *cdev) 716 { 717 struct raw3215_info *raw; 718 719 ccw_device_set_offline(cdev); 720 raw = cdev->dev.driver_data; 721 if (raw) { 722 cdev->dev.driver_data = NULL; 723 kfree(raw->buffer); 724 kfree(raw); 725 } 726 } 727 728 static int 729 raw3215_set_online (struct ccw_device *cdev) 730 { 731 struct raw3215_info *raw; 732 733 raw = cdev->dev.driver_data; 734 if (!raw) 735 return -ENODEV; 736 737 return raw3215_startup(raw); 738 } 739 740 static int 741 raw3215_set_offline (struct ccw_device *cdev) 742 { 743 struct raw3215_info *raw; 744 745 raw = cdev->dev.driver_data; 746 if (!raw) 747 return -ENODEV; 748 749 raw3215_shutdown(raw); 750 751 return 0; 752 } 753 754 static struct ccw_device_id raw3215_id[] = { 755 { CCW_DEVICE(0x3215, 0) }, 756 { /* end of list */ }, 757 }; 758 759 static struct ccw_driver raw3215_ccw_driver = { 760 .name = "3215", 761 .owner = THIS_MODULE, 762 .ids = raw3215_id, 763 .probe = &raw3215_probe, 764 .remove = &raw3215_remove, 765 .set_online = &raw3215_set_online, 766 .set_offline = &raw3215_set_offline, 767 }; 768 769 #ifdef CONFIG_TN3215_CONSOLE 770 /* 771 * Write a string to the 3215 console 772 */ 773 static void 774 con3215_write(struct console *co, const char *str, unsigned int count) 775 { 776 struct raw3215_info *raw; 777 int i; 778 779 if (count <= 0) 780 return; 781 raw = raw3215[0]; /* console 3215 is the first one */ 782 while (count > 0) { 783 for (i = 0; i < count; i++) 784 if (str[i] == '\t' || str[i] == '\n') 785 break; 786 raw3215_write(raw, str, i); 787 count -= i; 788 str += i; 789 if (count > 0) { 790 raw3215_putchar(raw, *str); 791 count--; 792 str++; 793 } 794 } 795 } 796 797 static struct tty_driver *con3215_device(struct console *c, int *index) 798 { 799 *index = c->index; 800 return tty3215_driver; 801 } 802 803 /* 804 * panic() calls console_unblank before the system enters a 805 * disabled, endless loop. 806 */ 807 static void 808 con3215_unblank(void) 809 { 810 struct raw3215_info *raw; 811 unsigned long flags; 812 813 raw = raw3215[0]; /* console 3215 is the first one */ 814 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 815 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 816 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 817 } 818 819 /* 820 * The console structure for the 3215 console 821 */ 822 static struct console con3215 = { 823 .name = "ttyS", 824 .write = con3215_write, 825 .device = con3215_device, 826 .unblank = con3215_unblank, 827 .flags = CON_PRINTBUFFER, 828 }; 829 830 /* 831 * 3215 console initialization code called from console_init(). 832 * NOTE: This is called before kmalloc is available. 833 */ 834 static int __init 835 con3215_init(void) 836 { 837 struct ccw_device *cdev; 838 struct raw3215_info *raw; 839 struct raw3215_req *req; 840 int i; 841 842 /* Check if 3215 is to be the console */ 843 if (!CONSOLE_IS_3215) 844 return -ENODEV; 845 846 /* Set the console mode for VM */ 847 if (MACHINE_IS_VM) { 848 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 849 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 850 } 851 852 /* allocate 3215 request structures */ 853 raw3215_freelist = NULL; 854 spin_lock_init(&raw3215_freelist_lock); 855 for (i = 0; i < NR_3215_REQ; i++) { 856 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); 857 req->next = raw3215_freelist; 858 raw3215_freelist = req; 859 } 860 861 cdev = ccw_device_probe_console(); 862 if (IS_ERR(cdev)) 863 return -ENODEV; 864 865 raw3215[0] = raw = (struct raw3215_info *) 866 alloc_bootmem_low(sizeof(struct raw3215_info)); 867 memset(raw, 0, sizeof(struct raw3215_info)); 868 raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); 869 raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); 870 raw->cdev = cdev; 871 cdev->dev.driver_data = raw; 872 cdev->handler = raw3215_irq; 873 874 raw->flags |= RAW3215_FIXED; 875 tasklet_init(&raw->tasklet, 876 (void (*)(unsigned long)) raw3215_tasklet, 877 (unsigned long) raw); 878 init_waitqueue_head(&raw->empty_wait); 879 880 /* Request the console irq */ 881 if (raw3215_startup(raw) != 0) { 882 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); 883 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); 884 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info)); 885 raw3215[0] = NULL; 886 printk("Couldn't find a 3215 console device\n"); 887 return -ENODEV; 888 } 889 register_console(&con3215); 890 return 0; 891 } 892 console_initcall(con3215_init); 893 #endif 894 895 /* 896 * tty3215_open 897 * 898 * This routine is called whenever a 3215 tty is opened. 899 */ 900 static int 901 tty3215_open(struct tty_struct *tty, struct file * filp) 902 { 903 struct raw3215_info *raw; 904 int retval, line; 905 906 line = tty->index; 907 if ((line < 0) || (line >= NR_3215)) 908 return -ENODEV; 909 910 raw = raw3215[line]; 911 if (raw == NULL) 912 return -ENODEV; 913 914 tty->driver_data = raw; 915 raw->tty = tty; 916 917 tty->low_latency = 0; /* don't use bottom half for pushing chars */ 918 /* 919 * Start up 3215 device 920 */ 921 retval = raw3215_startup(raw); 922 if (retval) 923 return retval; 924 925 return 0; 926 } 927 928 /* 929 * tty3215_close() 930 * 931 * This routine is called when the 3215 tty is closed. We wait 932 * for the remaining request to be completed. Then we clean up. 933 */ 934 static void 935 tty3215_close(struct tty_struct *tty, struct file * filp) 936 { 937 struct raw3215_info *raw; 938 939 raw = (struct raw3215_info *) tty->driver_data; 940 if (raw == NULL || tty->count > 1) 941 return; 942 tty->closing = 1; 943 /* Shutdown the terminal */ 944 raw3215_shutdown(raw); 945 tty->closing = 0; 946 raw->tty = NULL; 947 } 948 949 /* 950 * Returns the amount of free space in the output buffer. 951 */ 952 static int 953 tty3215_write_room(struct tty_struct *tty) 954 { 955 struct raw3215_info *raw; 956 957 raw = (struct raw3215_info *) tty->driver_data; 958 959 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 960 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 961 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 962 else 963 return 0; 964 } 965 966 /* 967 * String write routine for 3215 ttys 968 */ 969 static int 970 tty3215_write(struct tty_struct * tty, 971 const unsigned char *buf, int count) 972 { 973 struct raw3215_info *raw; 974 975 if (!tty) 976 return 0; 977 raw = (struct raw3215_info *) tty->driver_data; 978 raw3215_write(raw, buf, count); 979 return count; 980 } 981 982 /* 983 * Put character routine for 3215 ttys 984 */ 985 static void 986 tty3215_put_char(struct tty_struct *tty, unsigned char ch) 987 { 988 struct raw3215_info *raw; 989 990 if (!tty) 991 return; 992 raw = (struct raw3215_info *) tty->driver_data; 993 raw3215_putchar(raw, ch); 994 } 995 996 static void 997 tty3215_flush_chars(struct tty_struct *tty) 998 { 999 } 1000 1001 /* 1002 * Returns the number of characters in the output buffer 1003 */ 1004 static int 1005 tty3215_chars_in_buffer(struct tty_struct *tty) 1006 { 1007 struct raw3215_info *raw; 1008 1009 raw = (struct raw3215_info *) tty->driver_data; 1010 return raw->count; 1011 } 1012 1013 static void 1014 tty3215_flush_buffer(struct tty_struct *tty) 1015 { 1016 struct raw3215_info *raw; 1017 1018 raw = (struct raw3215_info *) tty->driver_data; 1019 raw3215_flush_buffer(raw); 1020 tty_wakeup(tty); 1021 } 1022 1023 /* 1024 * Currently we don't have any io controls for 3215 ttys 1025 */ 1026 static int 1027 tty3215_ioctl(struct tty_struct *tty, struct file * file, 1028 unsigned int cmd, unsigned long arg) 1029 { 1030 if (tty->flags & (1 << TTY_IO_ERROR)) 1031 return -EIO; 1032 1033 switch (cmd) { 1034 default: 1035 return -ENOIOCTLCMD; 1036 } 1037 return 0; 1038 } 1039 1040 /* 1041 * Disable reading from a 3215 tty 1042 */ 1043 static void 1044 tty3215_throttle(struct tty_struct * tty) 1045 { 1046 struct raw3215_info *raw; 1047 1048 raw = (struct raw3215_info *) tty->driver_data; 1049 raw->flags |= RAW3215_THROTTLED; 1050 } 1051 1052 /* 1053 * Enable reading from a 3215 tty 1054 */ 1055 static void 1056 tty3215_unthrottle(struct tty_struct * tty) 1057 { 1058 struct raw3215_info *raw; 1059 unsigned long flags; 1060 1061 raw = (struct raw3215_info *) tty->driver_data; 1062 if (raw->flags & RAW3215_THROTTLED) { 1063 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1064 raw->flags &= ~RAW3215_THROTTLED; 1065 raw3215_try_io(raw); 1066 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1067 } 1068 } 1069 1070 /* 1071 * Disable writing to a 3215 tty 1072 */ 1073 static void 1074 tty3215_stop(struct tty_struct *tty) 1075 { 1076 struct raw3215_info *raw; 1077 1078 raw = (struct raw3215_info *) tty->driver_data; 1079 raw->flags |= RAW3215_STOPPED; 1080 } 1081 1082 /* 1083 * Enable writing to a 3215 tty 1084 */ 1085 static void 1086 tty3215_start(struct tty_struct *tty) 1087 { 1088 struct raw3215_info *raw; 1089 unsigned long flags; 1090 1091 raw = (struct raw3215_info *) tty->driver_data; 1092 if (raw->flags & RAW3215_STOPPED) { 1093 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1094 raw->flags &= ~RAW3215_STOPPED; 1095 raw3215_try_io(raw); 1096 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1097 } 1098 } 1099 1100 static const struct tty_operations tty3215_ops = { 1101 .open = tty3215_open, 1102 .close = tty3215_close, 1103 .write = tty3215_write, 1104 .put_char = tty3215_put_char, 1105 .flush_chars = tty3215_flush_chars, 1106 .write_room = tty3215_write_room, 1107 .chars_in_buffer = tty3215_chars_in_buffer, 1108 .flush_buffer = tty3215_flush_buffer, 1109 .ioctl = tty3215_ioctl, 1110 .throttle = tty3215_throttle, 1111 .unthrottle = tty3215_unthrottle, 1112 .stop = tty3215_stop, 1113 .start = tty3215_start, 1114 }; 1115 1116 /* 1117 * 3215 tty registration code called from tty_init(). 1118 * Most kernel services (incl. kmalloc) are available at this poimt. 1119 */ 1120 static int __init 1121 tty3215_init(void) 1122 { 1123 struct tty_driver *driver; 1124 int ret; 1125 1126 if (!CONSOLE_IS_3215) 1127 return 0; 1128 1129 driver = alloc_tty_driver(NR_3215); 1130 if (!driver) 1131 return -ENOMEM; 1132 1133 ret = ccw_driver_register(&raw3215_ccw_driver); 1134 if (ret) { 1135 put_tty_driver(driver); 1136 return ret; 1137 } 1138 /* 1139 * Initialize the tty_driver structure 1140 * Entries in tty3215_driver that are NOT initialized: 1141 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1142 */ 1143 1144 driver->owner = THIS_MODULE; 1145 driver->driver_name = "tty3215"; 1146 driver->name = "ttyS"; 1147 driver->major = TTY_MAJOR; 1148 driver->minor_start = 64; 1149 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1150 driver->subtype = SYSTEM_TYPE_TTY; 1151 driver->init_termios = tty_std_termios; 1152 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1153 driver->init_termios.c_oflag = ONLCR | XTABS; 1154 driver->init_termios.c_lflag = ISIG; 1155 driver->flags = TTY_DRIVER_REAL_RAW; 1156 tty_set_operations(driver, &tty3215_ops); 1157 ret = tty_register_driver(driver); 1158 if (ret) { 1159 printk("Couldn't register tty3215 driver\n"); 1160 put_tty_driver(driver); 1161 return ret; 1162 } 1163 tty3215_driver = driver; 1164 return 0; 1165 } 1166 1167 static void __exit 1168 tty3215_exit(void) 1169 { 1170 tty_unregister_driver(tty3215_driver); 1171 put_tty_driver(tty3215_driver); 1172 ccw_driver_unregister(&raw3215_ccw_driver); 1173 } 1174 1175 module_init(tty3215_init); 1176 module_exit(tty3215_exit); 1177