1 /* 2 * 3215 line mode terminal driver. 3 * 4 * Copyright IBM Corp. 1999, 2009 5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * 7 * Updated: 8 * Aug-2000: Added tab support 9 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu> 10 */ 11 12 #include <linux/module.h> 13 #include <linux/types.h> 14 #include <linux/kdev_t.h> 15 #include <linux/tty.h> 16 #include <linux/tty_flip.h> 17 #include <linux/vt_kern.h> 18 #include <linux/init.h> 19 #include <linux/console.h> 20 #include <linux/interrupt.h> 21 #include <linux/err.h> 22 #include <linux/reboot.h> 23 #include <linux/serial.h> /* ASYNC_* flags */ 24 #include <linux/slab.h> 25 #include <asm/ccwdev.h> 26 #include <asm/cio.h> 27 #include <asm/io.h> 28 #include <asm/ebcdic.h> 29 #include <asm/uaccess.h> 30 #include <asm/delay.h> 31 #include <asm/cpcmd.h> 32 #include <asm/setup.h> 33 34 #include "ctrlchar.h" 35 36 #define NR_3215 1 37 #define NR_3215_REQ (4*NR_3215) 38 #define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ 39 #define RAW3215_INBUF_SIZE 256 /* input buffer size */ 40 #define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ 41 #define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ 42 #define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ 43 #define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ 44 #define RAW3215_NR_CCWS 3 45 #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ 46 47 #define RAW3215_FIXED 1 /* 3215 console device is not be freed */ 48 #define RAW3215_WORKING 4 /* set if a request is being worked on */ 49 #define RAW3215_THROTTLED 8 /* set if reading is disabled */ 50 #define RAW3215_STOPPED 16 /* set if writing is disabled */ 51 #define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ 52 #define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ 53 54 #define TAB_STOP_SIZE 8 /* tab stop size */ 55 56 /* 57 * Request types for a 3215 device 58 */ 59 enum raw3215_type { 60 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE 61 }; 62 63 /* 64 * Request structure for a 3215 device 65 */ 66 struct raw3215_req { 67 enum raw3215_type type; /* type of the request */ 68 int start, len; /* start index & len in output buffer */ 69 int delayable; /* indication to wait for more data */ 70 int residual; /* residual count for read request */ 71 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ 72 struct raw3215_info *info; /* pointer to main structure */ 73 struct raw3215_req *next; /* pointer to next request */ 74 } __attribute__ ((aligned(8))); 75 76 struct raw3215_info { 77 struct tty_port port; 78 struct ccw_device *cdev; /* device for tty driver */ 79 spinlock_t *lock; /* pointer to irq lock */ 80 int flags; /* state flags */ 81 char *buffer; /* pointer to output buffer */ 82 char *inbuf; /* pointer to input buffer */ 83 int head; /* first free byte in output buffer */ 84 int count; /* number of bytes in output buffer */ 85 int written; /* number of bytes in write requests */ 86 struct raw3215_req *queued_read; /* pointer to queued read requests */ 87 struct raw3215_req *queued_write;/* pointer to queued write requests */ 88 struct tasklet_struct tlet; /* tasklet to invoke tty_wakeup */ 89 wait_queue_head_t empty_wait; /* wait queue for flushing */ 90 struct timer_list timer; /* timer for delayed output */ 91 int line_pos; /* position on the line (for tabs) */ 92 char ubuffer[80]; /* copy_from_user buffer */ 93 }; 94 95 /* array of 3215 devices structures */ 96 static struct raw3215_info *raw3215[NR_3215]; 97 /* spinlock to protect the raw3215 array */ 98 static DEFINE_SPINLOCK(raw3215_device_lock); 99 /* list of free request structures */ 100 static struct raw3215_req *raw3215_freelist; 101 /* spinlock to protect free list */ 102 static spinlock_t raw3215_freelist_lock; 103 104 static struct tty_driver *tty3215_driver; 105 106 /* 107 * Get a request structure from the free list 108 */ 109 static inline struct raw3215_req *raw3215_alloc_req(void) 110 { 111 struct raw3215_req *req; 112 unsigned long flags; 113 114 spin_lock_irqsave(&raw3215_freelist_lock, flags); 115 req = raw3215_freelist; 116 raw3215_freelist = req->next; 117 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 118 return req; 119 } 120 121 /* 122 * Put a request structure back to the free list 123 */ 124 static inline void raw3215_free_req(struct raw3215_req *req) 125 { 126 unsigned long flags; 127 128 if (req->type == RAW3215_FREE) 129 return; /* don't free a free request */ 130 req->type = RAW3215_FREE; 131 spin_lock_irqsave(&raw3215_freelist_lock, flags); 132 req->next = raw3215_freelist; 133 raw3215_freelist = req; 134 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 135 } 136 137 /* 138 * Set up a read request that reads up to 160 byte from the 3215 device. 139 * If there is a queued read request it is used, but that shouldn't happen 140 * because a 3215 terminal won't accept a new read before the old one is 141 * completed. 142 */ 143 static void raw3215_mk_read_req(struct raw3215_info *raw) 144 { 145 struct raw3215_req *req; 146 struct ccw1 *ccw; 147 148 /* there can only be ONE read request at a time */ 149 req = raw->queued_read; 150 if (req == NULL) { 151 /* no queued read request, use new req structure */ 152 req = raw3215_alloc_req(); 153 req->type = RAW3215_READ; 154 req->info = raw; 155 raw->queued_read = req; 156 } 157 158 ccw = req->ccws; 159 ccw->cmd_code = 0x0A; /* read inquiry */ 160 ccw->flags = 0x20; /* ignore incorrect length */ 161 ccw->count = 160; 162 ccw->cda = (__u32) __pa(raw->inbuf); 163 } 164 165 /* 166 * Set up a write request with the information from the main structure. 167 * A ccw chain is created that writes as much as possible from the output 168 * buffer to the 3215 device. If a queued write exists it is replaced by 169 * the new, probably lengthened request. 170 */ 171 static void raw3215_mk_write_req(struct raw3215_info *raw) 172 { 173 struct raw3215_req *req; 174 struct ccw1 *ccw; 175 int len, count, ix, lines; 176 177 if (raw->count <= raw->written) 178 return; 179 /* check if there is a queued write request */ 180 req = raw->queued_write; 181 if (req == NULL) { 182 /* no queued write request, use new req structure */ 183 req = raw3215_alloc_req(); 184 req->type = RAW3215_WRITE; 185 req->info = raw; 186 raw->queued_write = req; 187 } else { 188 raw->written -= req->len; 189 } 190 191 ccw = req->ccws; 192 req->start = (raw->head - raw->count + raw->written) & 193 (RAW3215_BUFFER_SIZE - 1); 194 /* 195 * now we have to count newlines. We can at max accept 196 * RAW3215_MAX_NEWLINE newlines in a single ssch due to 197 * a restriction in VM 198 */ 199 lines = 0; 200 ix = req->start; 201 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { 202 if (raw->buffer[ix] == 0x15) 203 lines++; 204 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 205 } 206 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; 207 if (len > RAW3215_MAX_BYTES) 208 len = RAW3215_MAX_BYTES; 209 req->len = len; 210 raw->written += len; 211 212 /* set the indication if we should try to enlarge this request */ 213 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); 214 215 ix = req->start; 216 while (len > 0) { 217 if (ccw > req->ccws) 218 ccw[-1].flags |= 0x40; /* use command chaining */ 219 ccw->cmd_code = 0x01; /* write, auto carrier return */ 220 ccw->flags = 0x20; /* ignore incorrect length ind. */ 221 ccw->cda = 222 (__u32) __pa(raw->buffer + ix); 223 count = len; 224 if (ix + count > RAW3215_BUFFER_SIZE) 225 count = RAW3215_BUFFER_SIZE - ix; 226 ccw->count = count; 227 len -= count; 228 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); 229 ccw++; 230 } 231 /* 232 * Add a NOP to the channel program. 3215 devices are purely 233 * emulated and its much better to avoid the channel end 234 * interrupt in this case. 235 */ 236 if (ccw > req->ccws) 237 ccw[-1].flags |= 0x40; /* use command chaining */ 238 ccw->cmd_code = 0x03; /* NOP */ 239 ccw->flags = 0; 240 ccw->cda = 0; 241 ccw->count = 1; 242 } 243 244 /* 245 * Start a read or a write request 246 */ 247 static void raw3215_start_io(struct raw3215_info *raw) 248 { 249 struct raw3215_req *req; 250 int res; 251 252 req = raw->queued_read; 253 if (req != NULL && 254 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { 255 /* dequeue request */ 256 raw->queued_read = NULL; 257 res = ccw_device_start(raw->cdev, req->ccws, 258 (unsigned long) req, 0, 0); 259 if (res != 0) { 260 /* do_IO failed, put request back to queue */ 261 raw->queued_read = req; 262 } else { 263 raw->flags |= RAW3215_WORKING; 264 } 265 } 266 req = raw->queued_write; 267 if (req != NULL && 268 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { 269 /* dequeue request */ 270 raw->queued_write = NULL; 271 res = ccw_device_start(raw->cdev, req->ccws, 272 (unsigned long) req, 0, 0); 273 if (res != 0) { 274 /* do_IO failed, put request back to queue */ 275 raw->queued_write = req; 276 } else { 277 raw->flags |= RAW3215_WORKING; 278 } 279 } 280 } 281 282 /* 283 * Function to start a delayed output after RAW3215_TIMEOUT seconds 284 */ 285 static void raw3215_timeout(unsigned long __data) 286 { 287 struct raw3215_info *raw = (struct raw3215_info *) __data; 288 unsigned long flags; 289 290 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 291 if (raw->flags & RAW3215_TIMER_RUNS) { 292 del_timer(&raw->timer); 293 raw->flags &= ~RAW3215_TIMER_RUNS; 294 if (!(raw->port.flags & ASYNC_SUSPENDED)) { 295 raw3215_mk_write_req(raw); 296 raw3215_start_io(raw); 297 } 298 } 299 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 300 } 301 302 /* 303 * Function to conditionally start an IO. A read is started immediately, 304 * a write is only started immediately if the flush flag is on or the 305 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not 306 * done immediately a timer is started with a delay of RAW3215_TIMEOUT. 307 */ 308 static inline void raw3215_try_io(struct raw3215_info *raw) 309 { 310 if (!(raw->port.flags & ASYNC_INITIALIZED) || 311 (raw->port.flags & ASYNC_SUSPENDED)) 312 return; 313 if (raw->queued_read != NULL) 314 raw3215_start_io(raw); 315 else if (raw->queued_write != NULL) { 316 if ((raw->queued_write->delayable == 0) || 317 (raw->flags & RAW3215_FLUSHING)) { 318 /* execute write requests bigger than minimum size */ 319 raw3215_start_io(raw); 320 if (raw->flags & RAW3215_TIMER_RUNS) { 321 del_timer(&raw->timer); 322 raw->flags &= ~RAW3215_TIMER_RUNS; 323 } 324 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { 325 /* delay small writes */ 326 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 327 add_timer(&raw->timer); 328 raw->flags |= RAW3215_TIMER_RUNS; 329 } 330 } 331 } 332 333 /* 334 * Call tty_wakeup from tasklet context 335 */ 336 static void raw3215_wakeup(unsigned long data) 337 { 338 struct raw3215_info *raw = (struct raw3215_info *) data; 339 struct tty_struct *tty; 340 341 tty = tty_port_tty_get(&raw->port); 342 if (tty) { 343 tty_wakeup(tty); 344 tty_kref_put(tty); 345 } 346 } 347 348 /* 349 * Try to start the next IO and wake up processes waiting on the tty. 350 */ 351 static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty) 352 { 353 raw3215_mk_write_req(raw); 354 raw3215_try_io(raw); 355 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) 356 tasklet_schedule(&raw->tlet); 357 } 358 359 /* 360 * Interrupt routine, called from common io layer 361 */ 362 static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, 363 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 = dev_get_drvdata(&cdev->dev); 372 req = (struct raw3215_req *) intparm; 373 tty = tty_port_tty_get(&raw->port); 374 cstat = irb->scsw.cmd.cstat; 375 dstat = irb->scsw.cmd.dstat; 376 if (cstat != 0) 377 raw3215_next_io(raw, tty); 378 if (dstat & 0x01) { /* we got a unit exception */ 379 dstat &= ~0x01; /* we can ignore it */ 380 } 381 switch (dstat) { 382 case 0x80: 383 if (cstat != 0) 384 break; 385 /* Attention interrupt, someone hit the enter key */ 386 raw3215_mk_read_req(raw); 387 raw3215_next_io(raw, tty); 388 break; 389 case 0x08: 390 case 0x0C: 391 /* Channel end interrupt. */ 392 if ((raw = req->info) == NULL) 393 goto put_tty; /* That shouldn't happen ... */ 394 if (req->type == RAW3215_READ) { 395 /* store residual count, then wait for device end */ 396 req->residual = irb->scsw.cmd.count; 397 } 398 if (dstat == 0x08) 399 break; 400 case 0x04: 401 /* Device end interrupt. */ 402 if ((raw = req->info) == NULL) 403 goto put_tty; /* That shouldn't happen ... */ 404 if (req->type == RAW3215_READ && tty != NULL) { 405 unsigned int cchar; 406 407 count = 160 - req->residual; 408 EBCASC(raw->inbuf, count); 409 cchar = ctrlchar_handle(raw->inbuf, count, tty); 410 switch (cchar & CTRLCHAR_MASK) { 411 case CTRLCHAR_SYSRQ: 412 break; 413 414 case CTRLCHAR_CTRL: 415 tty_insert_flip_char(&raw->port, cchar, 416 TTY_NORMAL); 417 tty_flip_buffer_push(&raw->port); 418 break; 419 420 case CTRLCHAR_NONE: 421 if (count < 2 || 422 (strncmp(raw->inbuf+count-2, "\252n", 2) && 423 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 424 /* add the auto \n */ 425 raw->inbuf[count] = '\n'; 426 count++; 427 } else 428 count -= 2; 429 tty_insert_flip_string(&raw->port, raw->inbuf, 430 count); 431 tty_flip_buffer_push(&raw->port); 432 break; 433 } 434 } else if (req->type == RAW3215_WRITE) { 435 raw->count -= req->len; 436 raw->written -= req->len; 437 } 438 raw->flags &= ~RAW3215_WORKING; 439 raw3215_free_req(req); 440 /* check for empty wait */ 441 if (waitqueue_active(&raw->empty_wait) && 442 raw->queued_write == NULL && 443 raw->queued_read == NULL) { 444 wake_up_interruptible(&raw->empty_wait); 445 } 446 raw3215_next_io(raw, tty); 447 break; 448 default: 449 /* Strange interrupt, I'll do my best to clean up */ 450 if (req != NULL && req->type != RAW3215_FREE) { 451 if (req->type == RAW3215_WRITE) { 452 raw->count -= req->len; 453 raw->written -= req->len; 454 } 455 raw->flags &= ~RAW3215_WORKING; 456 raw3215_free_req(req); 457 } 458 raw3215_next_io(raw, tty); 459 } 460 put_tty: 461 tty_kref_put(tty); 462 } 463 464 /* 465 * Drop the oldest line from the output buffer. 466 */ 467 static void raw3215_drop_line(struct raw3215_info *raw) 468 { 469 int ix; 470 char ch; 471 472 BUG_ON(raw->written != 0); 473 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); 474 while (raw->count > 0) { 475 ch = raw->buffer[ix]; 476 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 477 raw->count--; 478 if (ch == 0x15) 479 break; 480 } 481 raw->head = ix; 482 } 483 484 /* 485 * Wait until length bytes are available int the output buffer. 486 * Has to be called with the s390irq lock held. Can be called 487 * disabled. 488 */ 489 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) 490 { 491 while (RAW3215_BUFFER_SIZE - raw->count < length) { 492 /* While console is frozen for suspend we have no other 493 * choice but to drop message from the buffer to make 494 * room for even more messages. */ 495 if (raw->port.flags & ASYNC_SUSPENDED) { 496 raw3215_drop_line(raw); 497 continue; 498 } 499 /* there might be a request pending */ 500 raw->flags |= RAW3215_FLUSHING; 501 raw3215_mk_write_req(raw); 502 raw3215_try_io(raw); 503 raw->flags &= ~RAW3215_FLUSHING; 504 #ifdef CONFIG_TN3215_CONSOLE 505 ccw_device_wait_idle(raw->cdev); 506 #endif 507 /* Enough room freed up ? */ 508 if (RAW3215_BUFFER_SIZE - raw->count >= length) 509 break; 510 /* there might be another cpu waiting for the lock */ 511 spin_unlock(get_ccwdev_lock(raw->cdev)); 512 udelay(100); 513 spin_lock(get_ccwdev_lock(raw->cdev)); 514 } 515 } 516 517 /* 518 * String write routine for 3215 devices 519 */ 520 static void raw3215_write(struct raw3215_info *raw, const char *str, 521 unsigned int length) 522 { 523 unsigned long flags; 524 int c, count; 525 526 while (length > 0) { 527 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 528 count = (length > RAW3215_BUFFER_SIZE) ? 529 RAW3215_BUFFER_SIZE : length; 530 length -= count; 531 532 raw3215_make_room(raw, count); 533 534 /* copy string to output buffer and convert it to EBCDIC */ 535 while (1) { 536 c = min_t(int, count, 537 min(RAW3215_BUFFER_SIZE - raw->count, 538 RAW3215_BUFFER_SIZE - raw->head)); 539 if (c <= 0) 540 break; 541 memcpy(raw->buffer + raw->head, str, c); 542 ASCEBC(raw->buffer + raw->head, c); 543 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 544 raw->count += c; 545 raw->line_pos += c; 546 str += c; 547 count -= c; 548 } 549 if (!(raw->flags & RAW3215_WORKING)) { 550 raw3215_mk_write_req(raw); 551 /* start or queue request */ 552 raw3215_try_io(raw); 553 } 554 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 555 } 556 } 557 558 /* 559 * Put character routine for 3215 devices 560 */ 561 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 562 { 563 unsigned long flags; 564 unsigned int length, i; 565 566 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 567 if (ch == '\t') { 568 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 569 raw->line_pos += length; 570 ch = ' '; 571 } else if (ch == '\n') { 572 length = 1; 573 raw->line_pos = 0; 574 } else { 575 length = 1; 576 raw->line_pos++; 577 } 578 raw3215_make_room(raw, length); 579 580 for (i = 0; i < length; i++) { 581 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 582 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 583 raw->count++; 584 } 585 if (!(raw->flags & RAW3215_WORKING)) { 586 raw3215_mk_write_req(raw); 587 /* start or queue request */ 588 raw3215_try_io(raw); 589 } 590 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 591 } 592 593 /* 594 * Flush routine, it simply sets the flush flag and tries to start 595 * pending IO. 596 */ 597 static void raw3215_flush_buffer(struct raw3215_info *raw) 598 { 599 unsigned long flags; 600 601 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 602 if (raw->count > 0) { 603 raw->flags |= RAW3215_FLUSHING; 604 raw3215_try_io(raw); 605 raw->flags &= ~RAW3215_FLUSHING; 606 } 607 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 608 } 609 610 /* 611 * Fire up a 3215 device. 612 */ 613 static int raw3215_startup(struct raw3215_info *raw) 614 { 615 unsigned long flags; 616 617 if (raw->port.flags & ASYNC_INITIALIZED) 618 return 0; 619 raw->line_pos = 0; 620 raw->port.flags |= ASYNC_INITIALIZED; 621 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 622 raw3215_try_io(raw); 623 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 624 625 return 0; 626 } 627 628 /* 629 * Shutdown a 3215 device. 630 */ 631 static void raw3215_shutdown(struct raw3215_info *raw) 632 { 633 DECLARE_WAITQUEUE(wait, current); 634 unsigned long flags; 635 636 if (!(raw->port.flags & ASYNC_INITIALIZED) || 637 (raw->flags & RAW3215_FIXED)) 638 return; 639 /* Wait for outstanding requests, then free irq */ 640 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 641 if ((raw->flags & RAW3215_WORKING) || 642 raw->queued_write != NULL || 643 raw->queued_read != NULL) { 644 raw->port.flags |= ASYNC_CLOSING; 645 add_wait_queue(&raw->empty_wait, &wait); 646 set_current_state(TASK_INTERRUPTIBLE); 647 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 648 schedule(); 649 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 650 remove_wait_queue(&raw->empty_wait, &wait); 651 set_current_state(TASK_RUNNING); 652 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING); 653 } 654 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 655 } 656 657 static struct raw3215_info *raw3215_alloc_info(void) 658 { 659 struct raw3215_info *info; 660 661 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); 662 if (!info) 663 return NULL; 664 665 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 666 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); 667 if (!info->buffer || !info->inbuf) { 668 kfree(info); 669 return NULL; 670 } 671 672 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info); 673 init_waitqueue_head(&info->empty_wait); 674 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); 675 tty_port_init(&info->port); 676 677 return info; 678 } 679 680 static void raw3215_free_info(struct raw3215_info *raw) 681 { 682 kfree(raw->inbuf); 683 kfree(raw->buffer); 684 tty_port_destroy(&raw->port); 685 kfree(raw); 686 } 687 688 static int raw3215_probe (struct ccw_device *cdev) 689 { 690 struct raw3215_info *raw; 691 int line; 692 693 /* Console is special. */ 694 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) 695 return 0; 696 697 raw = raw3215_alloc_info(); 698 if (raw == NULL) 699 return -ENOMEM; 700 701 raw->cdev = cdev; 702 dev_set_drvdata(&cdev->dev, raw); 703 cdev->handler = raw3215_irq; 704 705 spin_lock(&raw3215_device_lock); 706 for (line = 0; line < NR_3215; line++) { 707 if (!raw3215[line]) { 708 raw3215[line] = raw; 709 break; 710 } 711 } 712 spin_unlock(&raw3215_device_lock); 713 if (line == NR_3215) { 714 raw3215_free_info(raw); 715 return -ENODEV; 716 } 717 718 return 0; 719 } 720 721 static void raw3215_remove (struct ccw_device *cdev) 722 { 723 struct raw3215_info *raw; 724 unsigned int line; 725 726 ccw_device_set_offline(cdev); 727 raw = dev_get_drvdata(&cdev->dev); 728 if (raw) { 729 spin_lock(&raw3215_device_lock); 730 for (line = 0; line < NR_3215; line++) 731 if (raw3215[line] == raw) 732 break; 733 raw3215[line] = NULL; 734 spin_unlock(&raw3215_device_lock); 735 dev_set_drvdata(&cdev->dev, NULL); 736 raw3215_free_info(raw); 737 } 738 } 739 740 static int raw3215_set_online (struct ccw_device *cdev) 741 { 742 struct raw3215_info *raw; 743 744 raw = dev_get_drvdata(&cdev->dev); 745 if (!raw) 746 return -ENODEV; 747 748 return raw3215_startup(raw); 749 } 750 751 static int raw3215_set_offline (struct ccw_device *cdev) 752 { 753 struct raw3215_info *raw; 754 755 raw = dev_get_drvdata(&cdev->dev); 756 if (!raw) 757 return -ENODEV; 758 759 raw3215_shutdown(raw); 760 761 return 0; 762 } 763 764 static int raw3215_pm_stop(struct ccw_device *cdev) 765 { 766 struct raw3215_info *raw; 767 unsigned long flags; 768 769 /* Empty the output buffer, then prevent new I/O. */ 770 raw = dev_get_drvdata(&cdev->dev); 771 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 772 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 773 raw->port.flags |= ASYNC_SUSPENDED; 774 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 775 return 0; 776 } 777 778 static int raw3215_pm_start(struct ccw_device *cdev) 779 { 780 struct raw3215_info *raw; 781 unsigned long flags; 782 783 /* Allow I/O again and flush output buffer. */ 784 raw = dev_get_drvdata(&cdev->dev); 785 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 786 raw->port.flags &= ~ASYNC_SUSPENDED; 787 raw->flags |= RAW3215_FLUSHING; 788 raw3215_try_io(raw); 789 raw->flags &= ~RAW3215_FLUSHING; 790 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 791 return 0; 792 } 793 794 static struct ccw_device_id raw3215_id[] = { 795 { CCW_DEVICE(0x3215, 0) }, 796 { /* end of list */ }, 797 }; 798 799 static struct ccw_driver raw3215_ccw_driver = { 800 .driver = { 801 .name = "3215", 802 .owner = THIS_MODULE, 803 }, 804 .ids = raw3215_id, 805 .probe = &raw3215_probe, 806 .remove = &raw3215_remove, 807 .set_online = &raw3215_set_online, 808 .set_offline = &raw3215_set_offline, 809 .freeze = &raw3215_pm_stop, 810 .thaw = &raw3215_pm_start, 811 .restore = &raw3215_pm_start, 812 .int_class = IRQIO_C15, 813 }; 814 815 #ifdef CONFIG_TN3215_CONSOLE 816 /* 817 * Write a string to the 3215 console 818 */ 819 static void con3215_write(struct console *co, const char *str, 820 unsigned int count) 821 { 822 struct raw3215_info *raw; 823 int i; 824 825 if (count <= 0) 826 return; 827 raw = raw3215[0]; /* console 3215 is the first one */ 828 while (count > 0) { 829 for (i = 0; i < count; i++) 830 if (str[i] == '\t' || str[i] == '\n') 831 break; 832 raw3215_write(raw, str, i); 833 count -= i; 834 str += i; 835 if (count > 0) { 836 raw3215_putchar(raw, *str); 837 count--; 838 str++; 839 } 840 } 841 } 842 843 static struct tty_driver *con3215_device(struct console *c, int *index) 844 { 845 *index = c->index; 846 return tty3215_driver; 847 } 848 849 /* 850 * panic() calls con3215_flush through a panic_notifier 851 * before the system enters a disabled, endless loop. 852 */ 853 static void con3215_flush(void) 854 { 855 struct raw3215_info *raw; 856 unsigned long flags; 857 858 raw = raw3215[0]; /* console 3215 is the first one */ 859 if (raw->port.flags & ASYNC_SUSPENDED) 860 /* The console is still frozen for suspend. */ 861 if (ccw_device_force_console(raw->cdev)) 862 /* Forcing didn't work, no panic message .. */ 863 return; 864 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 865 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 866 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 867 } 868 869 static int con3215_notify(struct notifier_block *self, 870 unsigned long event, void *data) 871 { 872 con3215_flush(); 873 return NOTIFY_OK; 874 } 875 876 static struct notifier_block on_panic_nb = { 877 .notifier_call = con3215_notify, 878 .priority = 0, 879 }; 880 881 static struct notifier_block on_reboot_nb = { 882 .notifier_call = con3215_notify, 883 .priority = 0, 884 }; 885 886 /* 887 * The console structure for the 3215 console 888 */ 889 static struct console con3215 = { 890 .name = "ttyS", 891 .write = con3215_write, 892 .device = con3215_device, 893 .flags = CON_PRINTBUFFER, 894 }; 895 896 /* 897 * 3215 console initialization code called from console_init(). 898 */ 899 static int __init con3215_init(void) 900 { 901 struct ccw_device *cdev; 902 struct raw3215_info *raw; 903 struct raw3215_req *req; 904 int i; 905 906 /* Check if 3215 is to be the console */ 907 if (!CONSOLE_IS_3215) 908 return -ENODEV; 909 910 /* Set the console mode for VM */ 911 if (MACHINE_IS_VM) { 912 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 913 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 914 } 915 916 /* allocate 3215 request structures */ 917 raw3215_freelist = NULL; 918 spin_lock_init(&raw3215_freelist_lock); 919 for (i = 0; i < NR_3215_REQ; i++) { 920 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); 921 req->next = raw3215_freelist; 922 raw3215_freelist = req; 923 } 924 925 cdev = ccw_device_probe_console(); 926 if (IS_ERR(cdev)) 927 return -ENODEV; 928 929 raw3215[0] = raw = raw3215_alloc_info(); 930 raw->cdev = cdev; 931 dev_set_drvdata(&cdev->dev, raw); 932 cdev->handler = raw3215_irq; 933 934 raw->flags |= RAW3215_FIXED; 935 936 /* Request the console irq */ 937 if (raw3215_startup(raw) != 0) { 938 raw3215_free_info(raw); 939 raw3215[0] = NULL; 940 return -ENODEV; 941 } 942 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 943 register_reboot_notifier(&on_reboot_nb); 944 register_console(&con3215); 945 return 0; 946 } 947 console_initcall(con3215_init); 948 #endif 949 950 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) 951 { 952 struct raw3215_info *raw; 953 954 raw = raw3215[tty->index]; 955 if (raw == NULL) 956 return -ENODEV; 957 958 tty->driver_data = raw; 959 960 return tty_port_install(&raw->port, driver, tty); 961 } 962 963 /* 964 * tty3215_open 965 * 966 * This routine is called whenever a 3215 tty is opened. 967 */ 968 static int tty3215_open(struct tty_struct *tty, struct file * filp) 969 { 970 struct raw3215_info *raw = tty->driver_data; 971 int retval; 972 973 tty_port_tty_set(&raw->port, tty); 974 975 raw->port.low_latency = 0; /* don't use bottom half for pushing chars */ 976 /* 977 * Start up 3215 device 978 */ 979 retval = raw3215_startup(raw); 980 if (retval) 981 return retval; 982 983 return 0; 984 } 985 986 /* 987 * tty3215_close() 988 * 989 * This routine is called when the 3215 tty is closed. We wait 990 * for the remaining request to be completed. Then we clean up. 991 */ 992 static void tty3215_close(struct tty_struct *tty, struct file * filp) 993 { 994 struct raw3215_info *raw; 995 996 raw = (struct raw3215_info *) tty->driver_data; 997 if (raw == NULL || tty->count > 1) 998 return; 999 tty->closing = 1; 1000 /* Shutdown the terminal */ 1001 raw3215_shutdown(raw); 1002 tasklet_kill(&raw->tlet); 1003 tty->closing = 0; 1004 tty_port_tty_set(&raw->port, NULL); 1005 } 1006 1007 /* 1008 * Returns the amount of free space in the output buffer. 1009 */ 1010 static int tty3215_write_room(struct tty_struct *tty) 1011 { 1012 struct raw3215_info *raw; 1013 1014 raw = (struct raw3215_info *) tty->driver_data; 1015 1016 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 1017 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 1018 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 1019 else 1020 return 0; 1021 } 1022 1023 /* 1024 * String write routine for 3215 ttys 1025 */ 1026 static int tty3215_write(struct tty_struct * tty, 1027 const unsigned char *buf, int count) 1028 { 1029 struct raw3215_info *raw; 1030 1031 if (!tty) 1032 return 0; 1033 raw = (struct raw3215_info *) tty->driver_data; 1034 raw3215_write(raw, buf, count); 1035 return count; 1036 } 1037 1038 /* 1039 * Put character routine for 3215 ttys 1040 */ 1041 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) 1042 { 1043 struct raw3215_info *raw; 1044 1045 if (!tty) 1046 return 0; 1047 raw = (struct raw3215_info *) tty->driver_data; 1048 raw3215_putchar(raw, ch); 1049 return 1; 1050 } 1051 1052 static void tty3215_flush_chars(struct tty_struct *tty) 1053 { 1054 } 1055 1056 /* 1057 * Returns the number of characters in the output buffer 1058 */ 1059 static int tty3215_chars_in_buffer(struct tty_struct *tty) 1060 { 1061 struct raw3215_info *raw; 1062 1063 raw = (struct raw3215_info *) tty->driver_data; 1064 return raw->count; 1065 } 1066 1067 static void tty3215_flush_buffer(struct tty_struct *tty) 1068 { 1069 struct raw3215_info *raw; 1070 1071 raw = (struct raw3215_info *) tty->driver_data; 1072 raw3215_flush_buffer(raw); 1073 tty_wakeup(tty); 1074 } 1075 1076 /* 1077 * Disable reading from a 3215 tty 1078 */ 1079 static void tty3215_throttle(struct tty_struct * tty) 1080 { 1081 struct raw3215_info *raw; 1082 1083 raw = (struct raw3215_info *) tty->driver_data; 1084 raw->flags |= RAW3215_THROTTLED; 1085 } 1086 1087 /* 1088 * Enable reading from a 3215 tty 1089 */ 1090 static void tty3215_unthrottle(struct tty_struct * tty) 1091 { 1092 struct raw3215_info *raw; 1093 unsigned long flags; 1094 1095 raw = (struct raw3215_info *) tty->driver_data; 1096 if (raw->flags & RAW3215_THROTTLED) { 1097 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1098 raw->flags &= ~RAW3215_THROTTLED; 1099 raw3215_try_io(raw); 1100 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1101 } 1102 } 1103 1104 /* 1105 * Disable writing to a 3215 tty 1106 */ 1107 static void tty3215_stop(struct tty_struct *tty) 1108 { 1109 struct raw3215_info *raw; 1110 1111 raw = (struct raw3215_info *) tty->driver_data; 1112 raw->flags |= RAW3215_STOPPED; 1113 } 1114 1115 /* 1116 * Enable writing to a 3215 tty 1117 */ 1118 static void tty3215_start(struct tty_struct *tty) 1119 { 1120 struct raw3215_info *raw; 1121 unsigned long flags; 1122 1123 raw = (struct raw3215_info *) tty->driver_data; 1124 if (raw->flags & RAW3215_STOPPED) { 1125 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1126 raw->flags &= ~RAW3215_STOPPED; 1127 raw3215_try_io(raw); 1128 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1129 } 1130 } 1131 1132 static const struct tty_operations tty3215_ops = { 1133 .install = tty3215_install, 1134 .open = tty3215_open, 1135 .close = tty3215_close, 1136 .write = tty3215_write, 1137 .put_char = tty3215_put_char, 1138 .flush_chars = tty3215_flush_chars, 1139 .write_room = tty3215_write_room, 1140 .chars_in_buffer = tty3215_chars_in_buffer, 1141 .flush_buffer = tty3215_flush_buffer, 1142 .throttle = tty3215_throttle, 1143 .unthrottle = tty3215_unthrottle, 1144 .stop = tty3215_stop, 1145 .start = tty3215_start, 1146 }; 1147 1148 /* 1149 * 3215 tty registration code called from tty_init(). 1150 * Most kernel services (incl. kmalloc) are available at this poimt. 1151 */ 1152 static int __init tty3215_init(void) 1153 { 1154 struct tty_driver *driver; 1155 int ret; 1156 1157 if (!CONSOLE_IS_3215) 1158 return 0; 1159 1160 driver = alloc_tty_driver(NR_3215); 1161 if (!driver) 1162 return -ENOMEM; 1163 1164 ret = ccw_driver_register(&raw3215_ccw_driver); 1165 if (ret) { 1166 put_tty_driver(driver); 1167 return ret; 1168 } 1169 /* 1170 * Initialize the tty_driver structure 1171 * Entries in tty3215_driver that are NOT initialized: 1172 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1173 */ 1174 1175 driver->driver_name = "tty3215"; 1176 driver->name = "ttyS"; 1177 driver->major = TTY_MAJOR; 1178 driver->minor_start = 64; 1179 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1180 driver->subtype = SYSTEM_TYPE_TTY; 1181 driver->init_termios = tty_std_termios; 1182 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1183 driver->init_termios.c_oflag = ONLCR | XTABS; 1184 driver->init_termios.c_lflag = ISIG; 1185 driver->flags = TTY_DRIVER_REAL_RAW; 1186 tty_set_operations(driver, &tty3215_ops); 1187 ret = tty_register_driver(driver); 1188 if (ret) { 1189 put_tty_driver(driver); 1190 return ret; 1191 } 1192 tty3215_driver = driver; 1193 return 0; 1194 } 1195 1196 static void __exit tty3215_exit(void) 1197 { 1198 tty_unregister_driver(tty3215_driver); 1199 put_tty_driver(tty3215_driver); 1200 ccw_driver_unregister(&raw3215_ccw_driver); 1201 } 1202 1203 module_init(tty3215_init); 1204 module_exit(tty3215_exit); 1205