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(tty, cchar, TTY_NORMAL); 416 tty_flip_buffer_push(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(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, tty); 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, tty); 457 } 458 put_tty: 459 tty_kref_put(tty); 460 } 461 462 /* 463 * Drop the oldest line from the output buffer. 464 */ 465 static void raw3215_drop_line(struct raw3215_info *raw) 466 { 467 int ix; 468 char ch; 469 470 BUG_ON(raw->written != 0); 471 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); 472 while (raw->count > 0) { 473 ch = raw->buffer[ix]; 474 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 475 raw->count--; 476 if (ch == 0x15) 477 break; 478 } 479 raw->head = ix; 480 } 481 482 /* 483 * Wait until length bytes are available int the output buffer. 484 * Has to be called with the s390irq lock held. Can be called 485 * disabled. 486 */ 487 static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) 488 { 489 while (RAW3215_BUFFER_SIZE - raw->count < length) { 490 /* While console is frozen for suspend we have no other 491 * choice but to drop message from the buffer to make 492 * room for even more messages. */ 493 if (raw->port.flags & ASYNC_SUSPENDED) { 494 raw3215_drop_line(raw); 495 continue; 496 } 497 /* there might be a request pending */ 498 raw->flags |= RAW3215_FLUSHING; 499 raw3215_mk_write_req(raw); 500 raw3215_try_io(raw); 501 raw->flags &= ~RAW3215_FLUSHING; 502 #ifdef CONFIG_TN3215_CONSOLE 503 wait_cons_dev(); 504 #endif 505 /* Enough room freed up ? */ 506 if (RAW3215_BUFFER_SIZE - raw->count >= length) 507 break; 508 /* there might be another cpu waiting for the lock */ 509 spin_unlock(get_ccwdev_lock(raw->cdev)); 510 udelay(100); 511 spin_lock(get_ccwdev_lock(raw->cdev)); 512 } 513 } 514 515 /* 516 * String write routine for 3215 devices 517 */ 518 static void raw3215_write(struct raw3215_info *raw, const char *str, 519 unsigned int length) 520 { 521 unsigned long flags; 522 int c, count; 523 524 while (length > 0) { 525 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 526 count = (length > RAW3215_BUFFER_SIZE) ? 527 RAW3215_BUFFER_SIZE : length; 528 length -= count; 529 530 raw3215_make_room(raw, count); 531 532 /* copy string to output buffer and convert it to EBCDIC */ 533 while (1) { 534 c = min_t(int, count, 535 min(RAW3215_BUFFER_SIZE - raw->count, 536 RAW3215_BUFFER_SIZE - raw->head)); 537 if (c <= 0) 538 break; 539 memcpy(raw->buffer + raw->head, str, c); 540 ASCEBC(raw->buffer + raw->head, c); 541 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 542 raw->count += c; 543 raw->line_pos += c; 544 str += c; 545 count -= c; 546 } 547 if (!(raw->flags & RAW3215_WORKING)) { 548 raw3215_mk_write_req(raw); 549 /* start or queue request */ 550 raw3215_try_io(raw); 551 } 552 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 553 } 554 } 555 556 /* 557 * Put character routine for 3215 devices 558 */ 559 static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 560 { 561 unsigned long flags; 562 unsigned int length, i; 563 564 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 565 if (ch == '\t') { 566 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 567 raw->line_pos += length; 568 ch = ' '; 569 } else if (ch == '\n') { 570 length = 1; 571 raw->line_pos = 0; 572 } else { 573 length = 1; 574 raw->line_pos++; 575 } 576 raw3215_make_room(raw, length); 577 578 for (i = 0; i < length; i++) { 579 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 580 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 581 raw->count++; 582 } 583 if (!(raw->flags & RAW3215_WORKING)) { 584 raw3215_mk_write_req(raw); 585 /* start or queue request */ 586 raw3215_try_io(raw); 587 } 588 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 589 } 590 591 /* 592 * Flush routine, it simply sets the flush flag and tries to start 593 * pending IO. 594 */ 595 static void raw3215_flush_buffer(struct raw3215_info *raw) 596 { 597 unsigned long flags; 598 599 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 600 if (raw->count > 0) { 601 raw->flags |= RAW3215_FLUSHING; 602 raw3215_try_io(raw); 603 raw->flags &= ~RAW3215_FLUSHING; 604 } 605 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 606 } 607 608 /* 609 * Fire up a 3215 device. 610 */ 611 static int raw3215_startup(struct raw3215_info *raw) 612 { 613 unsigned long flags; 614 615 if (raw->port.flags & ASYNC_INITIALIZED) 616 return 0; 617 raw->line_pos = 0; 618 raw->port.flags |= ASYNC_INITIALIZED; 619 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 620 raw3215_try_io(raw); 621 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 622 623 return 0; 624 } 625 626 /* 627 * Shutdown a 3215 device. 628 */ 629 static void raw3215_shutdown(struct raw3215_info *raw) 630 { 631 DECLARE_WAITQUEUE(wait, current); 632 unsigned long flags; 633 634 if (!(raw->port.flags & ASYNC_INITIALIZED) || 635 (raw->flags & RAW3215_FIXED)) 636 return; 637 /* Wait for outstanding requests, then free irq */ 638 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 639 if ((raw->flags & RAW3215_WORKING) || 640 raw->queued_write != NULL || 641 raw->queued_read != NULL) { 642 raw->port.flags |= ASYNC_CLOSING; 643 add_wait_queue(&raw->empty_wait, &wait); 644 set_current_state(TASK_INTERRUPTIBLE); 645 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 646 schedule(); 647 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 648 remove_wait_queue(&raw->empty_wait, &wait); 649 set_current_state(TASK_RUNNING); 650 raw->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING); 651 } 652 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 653 } 654 655 static struct raw3215_info *raw3215_alloc_info(void) 656 { 657 struct raw3215_info *info; 658 659 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); 660 if (!info) 661 return NULL; 662 663 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 664 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); 665 if (!info->buffer || !info->inbuf) { 666 kfree(info); 667 return NULL; 668 } 669 670 setup_timer(&info->timer, raw3215_timeout, (unsigned long)info); 671 init_waitqueue_head(&info->empty_wait); 672 tasklet_init(&info->tlet, raw3215_wakeup, (unsigned long)info); 673 tty_port_init(&info->port); 674 675 return info; 676 } 677 678 static void raw3215_free_info(struct raw3215_info *raw) 679 { 680 kfree(raw->inbuf); 681 kfree(raw->buffer); 682 tty_port_destroy(&raw->port); 683 kfree(raw); 684 } 685 686 static int raw3215_probe (struct ccw_device *cdev) 687 { 688 struct raw3215_info *raw; 689 int line; 690 691 /* Console is special. */ 692 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) 693 return 0; 694 695 raw = raw3215_alloc_info(); 696 if (raw == NULL) 697 return -ENOMEM; 698 699 raw->cdev = cdev; 700 dev_set_drvdata(&cdev->dev, raw); 701 cdev->handler = raw3215_irq; 702 703 spin_lock(&raw3215_device_lock); 704 for (line = 0; line < NR_3215; line++) { 705 if (!raw3215[line]) { 706 raw3215[line] = raw; 707 break; 708 } 709 } 710 spin_unlock(&raw3215_device_lock); 711 if (line == NR_3215) { 712 raw3215_free_info(raw); 713 return -ENODEV; 714 } 715 716 return 0; 717 } 718 719 static void raw3215_remove (struct ccw_device *cdev) 720 { 721 struct raw3215_info *raw; 722 unsigned int line; 723 724 ccw_device_set_offline(cdev); 725 raw = dev_get_drvdata(&cdev->dev); 726 if (raw) { 727 spin_lock(&raw3215_device_lock); 728 for (line = 0; line < NR_3215; line++) 729 if (raw3215[line] == raw) 730 break; 731 raw3215[line] = NULL; 732 spin_unlock(&raw3215_device_lock); 733 dev_set_drvdata(&cdev->dev, NULL); 734 raw3215_free_info(raw); 735 } 736 } 737 738 static int raw3215_set_online (struct ccw_device *cdev) 739 { 740 struct raw3215_info *raw; 741 742 raw = dev_get_drvdata(&cdev->dev); 743 if (!raw) 744 return -ENODEV; 745 746 return raw3215_startup(raw); 747 } 748 749 static int raw3215_set_offline (struct ccw_device *cdev) 750 { 751 struct raw3215_info *raw; 752 753 raw = dev_get_drvdata(&cdev->dev); 754 if (!raw) 755 return -ENODEV; 756 757 raw3215_shutdown(raw); 758 759 return 0; 760 } 761 762 static int raw3215_pm_stop(struct ccw_device *cdev) 763 { 764 struct raw3215_info *raw; 765 unsigned long flags; 766 767 /* Empty the output buffer, then prevent new I/O. */ 768 raw = dev_get_drvdata(&cdev->dev); 769 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 770 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 771 raw->port.flags |= ASYNC_SUSPENDED; 772 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 773 return 0; 774 } 775 776 static int raw3215_pm_start(struct ccw_device *cdev) 777 { 778 struct raw3215_info *raw; 779 unsigned long flags; 780 781 /* Allow I/O again and flush output buffer. */ 782 raw = dev_get_drvdata(&cdev->dev); 783 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 784 raw->port.flags &= ~ASYNC_SUSPENDED; 785 raw->flags |= RAW3215_FLUSHING; 786 raw3215_try_io(raw); 787 raw->flags &= ~RAW3215_FLUSHING; 788 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 789 return 0; 790 } 791 792 static struct ccw_device_id raw3215_id[] = { 793 { CCW_DEVICE(0x3215, 0) }, 794 { /* end of list */ }, 795 }; 796 797 static struct ccw_driver raw3215_ccw_driver = { 798 .driver = { 799 .name = "3215", 800 .owner = THIS_MODULE, 801 }, 802 .ids = raw3215_id, 803 .probe = &raw3215_probe, 804 .remove = &raw3215_remove, 805 .set_online = &raw3215_set_online, 806 .set_offline = &raw3215_set_offline, 807 .freeze = &raw3215_pm_stop, 808 .thaw = &raw3215_pm_start, 809 .restore = &raw3215_pm_start, 810 .int_class = IRQIO_C15, 811 }; 812 813 #ifdef CONFIG_TN3215_CONSOLE 814 /* 815 * Write a string to the 3215 console 816 */ 817 static void con3215_write(struct console *co, const char *str, 818 unsigned int count) 819 { 820 struct raw3215_info *raw; 821 int i; 822 823 if (count <= 0) 824 return; 825 raw = raw3215[0]; /* console 3215 is the first one */ 826 while (count > 0) { 827 for (i = 0; i < count; i++) 828 if (str[i] == '\t' || str[i] == '\n') 829 break; 830 raw3215_write(raw, str, i); 831 count -= i; 832 str += i; 833 if (count > 0) { 834 raw3215_putchar(raw, *str); 835 count--; 836 str++; 837 } 838 } 839 } 840 841 static struct tty_driver *con3215_device(struct console *c, int *index) 842 { 843 *index = c->index; 844 return tty3215_driver; 845 } 846 847 /* 848 * panic() calls con3215_flush through a panic_notifier 849 * before the system enters a disabled, endless loop. 850 */ 851 static void con3215_flush(void) 852 { 853 struct raw3215_info *raw; 854 unsigned long flags; 855 856 raw = raw3215[0]; /* console 3215 is the first one */ 857 if (raw->port.flags & ASYNC_SUSPENDED) 858 /* The console is still frozen for suspend. */ 859 if (ccw_device_force_console()) 860 /* Forcing didn't work, no panic message .. */ 861 return; 862 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 863 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 864 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 865 } 866 867 static int con3215_notify(struct notifier_block *self, 868 unsigned long event, void *data) 869 { 870 con3215_flush(); 871 return NOTIFY_OK; 872 } 873 874 static struct notifier_block on_panic_nb = { 875 .notifier_call = con3215_notify, 876 .priority = 0, 877 }; 878 879 static struct notifier_block on_reboot_nb = { 880 .notifier_call = con3215_notify, 881 .priority = 0, 882 }; 883 884 /* 885 * The console structure for the 3215 console 886 */ 887 static struct console con3215 = { 888 .name = "ttyS", 889 .write = con3215_write, 890 .device = con3215_device, 891 .flags = CON_PRINTBUFFER, 892 }; 893 894 /* 895 * 3215 console initialization code called from console_init(). 896 */ 897 static int __init con3215_init(void) 898 { 899 struct ccw_device *cdev; 900 struct raw3215_info *raw; 901 struct raw3215_req *req; 902 int i; 903 904 /* Check if 3215 is to be the console */ 905 if (!CONSOLE_IS_3215) 906 return -ENODEV; 907 908 /* Set the console mode for VM */ 909 if (MACHINE_IS_VM) { 910 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 911 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 912 } 913 914 /* allocate 3215 request structures */ 915 raw3215_freelist = NULL; 916 spin_lock_init(&raw3215_freelist_lock); 917 for (i = 0; i < NR_3215_REQ; i++) { 918 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); 919 req->next = raw3215_freelist; 920 raw3215_freelist = req; 921 } 922 923 cdev = ccw_device_probe_console(); 924 if (IS_ERR(cdev)) 925 return -ENODEV; 926 927 raw3215[0] = raw = raw3215_alloc_info(); 928 raw->cdev = cdev; 929 dev_set_drvdata(&cdev->dev, raw); 930 cdev->handler = raw3215_irq; 931 932 raw->flags |= RAW3215_FIXED; 933 934 /* Request the console irq */ 935 if (raw3215_startup(raw) != 0) { 936 raw3215_free_info(raw); 937 raw3215[0] = NULL; 938 return -ENODEV; 939 } 940 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 941 register_reboot_notifier(&on_reboot_nb); 942 register_console(&con3215); 943 return 0; 944 } 945 console_initcall(con3215_init); 946 #endif 947 948 static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty) 949 { 950 struct raw3215_info *raw; 951 952 raw = raw3215[tty->index]; 953 if (raw == NULL) 954 return -ENODEV; 955 956 tty->driver_data = raw; 957 958 return tty_port_install(&raw->port, driver, tty); 959 } 960 961 /* 962 * tty3215_open 963 * 964 * This routine is called whenever a 3215 tty is opened. 965 */ 966 static int tty3215_open(struct tty_struct *tty, struct file * filp) 967 { 968 struct raw3215_info *raw = tty->driver_data; 969 int retval; 970 971 tty_port_tty_set(&raw->port, tty); 972 973 tty->low_latency = 0; /* don't use bottom half for pushing chars */ 974 /* 975 * Start up 3215 device 976 */ 977 retval = raw3215_startup(raw); 978 if (retval) 979 return retval; 980 981 return 0; 982 } 983 984 /* 985 * tty3215_close() 986 * 987 * This routine is called when the 3215 tty is closed. We wait 988 * for the remaining request to be completed. Then we clean up. 989 */ 990 static void tty3215_close(struct tty_struct *tty, struct file * filp) 991 { 992 struct raw3215_info *raw; 993 994 raw = (struct raw3215_info *) tty->driver_data; 995 if (raw == NULL || tty->count > 1) 996 return; 997 tty->closing = 1; 998 /* Shutdown the terminal */ 999 raw3215_shutdown(raw); 1000 tasklet_kill(&raw->tlet); 1001 tty->closing = 0; 1002 tty_port_tty_set(&raw->port, NULL); 1003 } 1004 1005 /* 1006 * Returns the amount of free space in the output buffer. 1007 */ 1008 static int tty3215_write_room(struct tty_struct *tty) 1009 { 1010 struct raw3215_info *raw; 1011 1012 raw = (struct raw3215_info *) tty->driver_data; 1013 1014 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 1015 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 1016 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 1017 else 1018 return 0; 1019 } 1020 1021 /* 1022 * String write routine for 3215 ttys 1023 */ 1024 static int tty3215_write(struct tty_struct * tty, 1025 const unsigned char *buf, int count) 1026 { 1027 struct raw3215_info *raw; 1028 1029 if (!tty) 1030 return 0; 1031 raw = (struct raw3215_info *) tty->driver_data; 1032 raw3215_write(raw, buf, count); 1033 return count; 1034 } 1035 1036 /* 1037 * Put character routine for 3215 ttys 1038 */ 1039 static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) 1040 { 1041 struct raw3215_info *raw; 1042 1043 if (!tty) 1044 return 0; 1045 raw = (struct raw3215_info *) tty->driver_data; 1046 raw3215_putchar(raw, ch); 1047 return 1; 1048 } 1049 1050 static void tty3215_flush_chars(struct tty_struct *tty) 1051 { 1052 } 1053 1054 /* 1055 * Returns the number of characters in the output buffer 1056 */ 1057 static int tty3215_chars_in_buffer(struct tty_struct *tty) 1058 { 1059 struct raw3215_info *raw; 1060 1061 raw = (struct raw3215_info *) tty->driver_data; 1062 return raw->count; 1063 } 1064 1065 static void tty3215_flush_buffer(struct tty_struct *tty) 1066 { 1067 struct raw3215_info *raw; 1068 1069 raw = (struct raw3215_info *) tty->driver_data; 1070 raw3215_flush_buffer(raw); 1071 tty_wakeup(tty); 1072 } 1073 1074 /* 1075 * Disable reading from a 3215 tty 1076 */ 1077 static void tty3215_throttle(struct tty_struct * tty) 1078 { 1079 struct raw3215_info *raw; 1080 1081 raw = (struct raw3215_info *) tty->driver_data; 1082 raw->flags |= RAW3215_THROTTLED; 1083 } 1084 1085 /* 1086 * Enable reading from a 3215 tty 1087 */ 1088 static void tty3215_unthrottle(struct tty_struct * tty) 1089 { 1090 struct raw3215_info *raw; 1091 unsigned long flags; 1092 1093 raw = (struct raw3215_info *) tty->driver_data; 1094 if (raw->flags & RAW3215_THROTTLED) { 1095 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1096 raw->flags &= ~RAW3215_THROTTLED; 1097 raw3215_try_io(raw); 1098 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1099 } 1100 } 1101 1102 /* 1103 * Disable writing to a 3215 tty 1104 */ 1105 static void tty3215_stop(struct tty_struct *tty) 1106 { 1107 struct raw3215_info *raw; 1108 1109 raw = (struct raw3215_info *) tty->driver_data; 1110 raw->flags |= RAW3215_STOPPED; 1111 } 1112 1113 /* 1114 * Enable writing to a 3215 tty 1115 */ 1116 static void tty3215_start(struct tty_struct *tty) 1117 { 1118 struct raw3215_info *raw; 1119 unsigned long flags; 1120 1121 raw = (struct raw3215_info *) tty->driver_data; 1122 if (raw->flags & RAW3215_STOPPED) { 1123 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1124 raw->flags &= ~RAW3215_STOPPED; 1125 raw3215_try_io(raw); 1126 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1127 } 1128 } 1129 1130 static const struct tty_operations tty3215_ops = { 1131 .install = tty3215_install, 1132 .open = tty3215_open, 1133 .close = tty3215_close, 1134 .write = tty3215_write, 1135 .put_char = tty3215_put_char, 1136 .flush_chars = tty3215_flush_chars, 1137 .write_room = tty3215_write_room, 1138 .chars_in_buffer = tty3215_chars_in_buffer, 1139 .flush_buffer = tty3215_flush_buffer, 1140 .throttle = tty3215_throttle, 1141 .unthrottle = tty3215_unthrottle, 1142 .stop = tty3215_stop, 1143 .start = tty3215_start, 1144 }; 1145 1146 /* 1147 * 3215 tty registration code called from tty_init(). 1148 * Most kernel services (incl. kmalloc) are available at this poimt. 1149 */ 1150 static int __init tty3215_init(void) 1151 { 1152 struct tty_driver *driver; 1153 int ret; 1154 1155 if (!CONSOLE_IS_3215) 1156 return 0; 1157 1158 driver = alloc_tty_driver(NR_3215); 1159 if (!driver) 1160 return -ENOMEM; 1161 1162 ret = ccw_driver_register(&raw3215_ccw_driver); 1163 if (ret) { 1164 put_tty_driver(driver); 1165 return ret; 1166 } 1167 /* 1168 * Initialize the tty_driver structure 1169 * Entries in tty3215_driver that are NOT initialized: 1170 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1171 */ 1172 1173 driver->driver_name = "tty3215"; 1174 driver->name = "ttyS"; 1175 driver->major = TTY_MAJOR; 1176 driver->minor_start = 64; 1177 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1178 driver->subtype = SYSTEM_TYPE_TTY; 1179 driver->init_termios = tty_std_termios; 1180 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1181 driver->init_termios.c_oflag = ONLCR | XTABS; 1182 driver->init_termios.c_lflag = ISIG; 1183 driver->flags = TTY_DRIVER_REAL_RAW; 1184 tty_set_operations(driver, &tty3215_ops); 1185 ret = tty_register_driver(driver); 1186 if (ret) { 1187 put_tty_driver(driver); 1188 return ret; 1189 } 1190 tty3215_driver = driver; 1191 return 0; 1192 } 1193 1194 static void __exit tty3215_exit(void) 1195 { 1196 tty_unregister_driver(tty3215_driver); 1197 put_tty_driver(tty3215_driver); 1198 ccw_driver_unregister(&raw3215_ccw_driver); 1199 } 1200 1201 module_init(tty3215_init); 1202 module_exit(tty3215_exit); 1203