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/slab.h> 24#include <asm/ccwdev.h> 25#include <asm/cio.h> 26#include <asm/io.h> 27#include <asm/ebcdic.h> 28#include <asm/uaccess.h> 29#include <asm/delay.h> 30#include <asm/cpcmd.h> 31#include <asm/setup.h> 32 33#include "ctrlchar.h" 34 35#define NR_3215 1 36#define NR_3215_REQ (4*NR_3215) 37#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ 38#define RAW3215_INBUF_SIZE 256 /* input buffer size */ 39#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ 40#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ 41#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ 42#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ 43#define RAW3215_NR_CCWS 3 44#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ 45 46#define RAW3215_FIXED 1 /* 3215 console device is not be freed */ 47#define RAW3215_ACTIVE 2 /* set if the device is in use */ 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_CLOSING 32 /* set while in close process */ 52#define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ 53#define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ 54#define RAW3215_FROZEN 256 /* set if 3215 is frozen for suspend */ 55 56#define TAB_STOP_SIZE 8 /* tab stop size */ 57 58/* 59 * Request types for a 3215 device 60 */ 61enum raw3215_type { 62 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE 63}; 64 65/* 66 * Request structure for a 3215 device 67 */ 68struct raw3215_req { 69 enum raw3215_type type; /* type of the request */ 70 int start, len; /* start index & len in output buffer */ 71 int delayable; /* indication to wait for more data */ 72 int residual; /* residual count for read request */ 73 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ 74 struct raw3215_info *info; /* pointer to main structure */ 75 struct raw3215_req *next; /* pointer to next request */ 76} __attribute__ ((aligned(8))); 77 78struct raw3215_info { 79 struct ccw_device *cdev; /* device for tty driver */ 80 spinlock_t *lock; /* pointer to irq lock */ 81 int flags; /* state flags */ 82 char *buffer; /* pointer to output buffer */ 83 char *inbuf; /* pointer to input buffer */ 84 int head; /* first free byte in output buffer */ 85 int count; /* number of bytes in output buffer */ 86 int written; /* number of bytes in write requests */ 87 struct tty_struct *tty; /* pointer to tty structure if present */ 88 struct raw3215_req *queued_read; /* pointer to queued read requests */ 89 struct raw3215_req *queued_write;/* pointer to queued write requests */ 90 wait_queue_head_t empty_wait; /* wait queue for flushing */ 91 struct timer_list timer; /* timer for delayed output */ 92 int line_pos; /* position on the line (for tabs) */ 93 char ubuffer[80]; /* copy_from_user buffer */ 94}; 95 96/* array of 3215 devices structures */ 97static struct raw3215_info *raw3215[NR_3215]; 98/* spinlock to protect the raw3215 array */ 99static DEFINE_SPINLOCK(raw3215_device_lock); 100/* list of free request structures */ 101static struct raw3215_req *raw3215_freelist; 102/* spinlock to protect free list */ 103static spinlock_t raw3215_freelist_lock; 104 105static struct tty_driver *tty3215_driver; 106 107/* 108 * Get a request structure from the free list 109 */ 110static inline struct raw3215_req *raw3215_alloc_req(void) 111{ 112 struct raw3215_req *req; 113 unsigned long flags; 114 115 spin_lock_irqsave(&raw3215_freelist_lock, flags); 116 req = raw3215_freelist; 117 raw3215_freelist = req->next; 118 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 119 return req; 120} 121 122/* 123 * Put a request structure back to the free list 124 */ 125static inline void raw3215_free_req(struct raw3215_req *req) 126{ 127 unsigned long flags; 128 129 if (req->type == RAW3215_FREE) 130 return; /* don't free a free request */ 131 req->type = RAW3215_FREE; 132 spin_lock_irqsave(&raw3215_freelist_lock, flags); 133 req->next = raw3215_freelist; 134 raw3215_freelist = req; 135 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 136} 137 138/* 139 * Set up a read request that reads up to 160 byte from the 3215 device. 140 * If there is a queued read request it is used, but that shouldn't happen 141 * because a 3215 terminal won't accept a new read before the old one is 142 * completed. 143 */ 144static void raw3215_mk_read_req(struct raw3215_info *raw) 145{ 146 struct raw3215_req *req; 147 struct ccw1 *ccw; 148 149 /* there can only be ONE read request at a time */ 150 req = raw->queued_read; 151 if (req == NULL) { 152 /* no queued read request, use new req structure */ 153 req = raw3215_alloc_req(); 154 req->type = RAW3215_READ; 155 req->info = raw; 156 raw->queued_read = req; 157 } 158 159 ccw = req->ccws; 160 ccw->cmd_code = 0x0A; /* read inquiry */ 161 ccw->flags = 0x20; /* ignore incorrect length */ 162 ccw->count = 160; 163 ccw->cda = (__u32) __pa(raw->inbuf); 164} 165 166/* 167 * Set up a write request with the information from the main structure. 168 * A ccw chain is created that writes as much as possible from the output 169 * buffer to the 3215 device. If a queued write exists it is replaced by 170 * the new, probably lengthened request. 171 */ 172static void raw3215_mk_write_req(struct raw3215_info *raw) 173{ 174 struct raw3215_req *req; 175 struct ccw1 *ccw; 176 int len, count, ix, lines; 177 178 if (raw->count <= raw->written) 179 return; 180 /* check if there is a queued write request */ 181 req = raw->queued_write; 182 if (req == NULL) { 183 /* no queued write request, use new req structure */ 184 req = raw3215_alloc_req(); 185 req->type = RAW3215_WRITE; 186 req->info = raw; 187 raw->queued_write = req; 188 } else { 189 raw->written -= req->len; 190 } 191 192 ccw = req->ccws; 193 req->start = (raw->head - raw->count + raw->written) & 194 (RAW3215_BUFFER_SIZE - 1); 195 /* 196 * now we have to count newlines. We can at max accept 197 * RAW3215_MAX_NEWLINE newlines in a single ssch due to 198 * a restriction in VM 199 */ 200 lines = 0; 201 ix = req->start; 202 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { 203 if (raw->buffer[ix] == 0x15) 204 lines++; 205 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 206 } 207 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; 208 if (len > RAW3215_MAX_BYTES) 209 len = RAW3215_MAX_BYTES; 210 req->len = len; 211 raw->written += len; 212 213 /* set the indication if we should try to enlarge this request */ 214 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); 215 216 ix = req->start; 217 while (len > 0) { 218 if (ccw > req->ccws) 219 ccw[-1].flags |= 0x40; /* use command chaining */ 220 ccw->cmd_code = 0x01; /* write, auto carrier return */ 221 ccw->flags = 0x20; /* ignore incorrect length ind. */ 222 ccw->cda = 223 (__u32) __pa(raw->buffer + ix); 224 count = len; 225 if (ix + count > RAW3215_BUFFER_SIZE) 226 count = RAW3215_BUFFER_SIZE - ix; 227 ccw->count = count; 228 len -= count; 229 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); 230 ccw++; 231 } 232 /* 233 * Add a NOP to the channel program. 3215 devices are purely 234 * emulated and its much better to avoid the channel end 235 * interrupt in this case. 236 */ 237 if (ccw > req->ccws) 238 ccw[-1].flags |= 0x40; /* use command chaining */ 239 ccw->cmd_code = 0x03; /* NOP */ 240 ccw->flags = 0; 241 ccw->cda = 0; 242 ccw->count = 1; 243} 244 245/* 246 * Start a read or a write request 247 */ 248static void raw3215_start_io(struct raw3215_info *raw) 249{ 250 struct raw3215_req *req; 251 int res; 252 253 req = raw->queued_read; 254 if (req != NULL && 255 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { 256 /* dequeue request */ 257 raw->queued_read = NULL; 258 res = ccw_device_start(raw->cdev, req->ccws, 259 (unsigned long) req, 0, 0); 260 if (res != 0) { 261 /* do_IO failed, put request back to queue */ 262 raw->queued_read = req; 263 } else { 264 raw->flags |= RAW3215_WORKING; 265 } 266 } 267 req = raw->queued_write; 268 if (req != NULL && 269 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { 270 /* dequeue request */ 271 raw->queued_write = NULL; 272 res = ccw_device_start(raw->cdev, req->ccws, 273 (unsigned long) req, 0, 0); 274 if (res != 0) { 275 /* do_IO failed, put request back to queue */ 276 raw->queued_write = req; 277 } else { 278 raw->flags |= RAW3215_WORKING; 279 } 280 } 281} 282 283/* 284 * Function to start a delayed output after RAW3215_TIMEOUT seconds 285 */ 286static void raw3215_timeout(unsigned long __data) 287{ 288 struct raw3215_info *raw = (struct raw3215_info *) __data; 289 unsigned long flags; 290 291 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 292 if (raw->flags & RAW3215_TIMER_RUNS) { 293 del_timer(&raw->timer); 294 raw->flags &= ~RAW3215_TIMER_RUNS; 295 if (!(raw->flags & RAW3215_FROZEN)) { 296 raw3215_mk_write_req(raw); 297 raw3215_start_io(raw); 298 } 299 } 300 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 301} 302 303/* 304 * Function to conditionally start an IO. A read is started immediately, 305 * a write is only started immediately if the flush flag is on or the 306 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not 307 * done immediately a timer is started with a delay of RAW3215_TIMEOUT. 308 */ 309static inline void raw3215_try_io(struct raw3215_info *raw) 310{ 311 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FROZEN)) 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 init_timer(&raw->timer); 327 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 328 raw->timer.data = (unsigned long) raw; 329 raw->timer.function = raw3215_timeout; 330 add_timer(&raw->timer); 331 raw->flags |= RAW3215_TIMER_RUNS; 332 } 333 } 334} 335 336/* 337 * Try to start the next IO and wake up processes waiting on the tty. 338 */ 339static void raw3215_next_io(struct raw3215_info *raw) 340{ 341 struct tty_struct *tty; 342 343 raw3215_mk_write_req(raw); 344 raw3215_try_io(raw); 345 tty = raw->tty; 346 if (tty != NULL && 347 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { 348 tty_wakeup(tty); 349 } 350} 351 352/* 353 * Interrupt routine, called from common io layer 354 */ 355static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm, 356 struct irb *irb) 357{ 358 struct raw3215_info *raw; 359 struct raw3215_req *req; 360 struct tty_struct *tty; 361 int cstat, dstat; 362 int count; 363 364 raw = dev_get_drvdata(&cdev->dev); 365 req = (struct raw3215_req *) intparm; 366 cstat = irb->scsw.cmd.cstat; 367 dstat = irb->scsw.cmd.dstat; 368 if (cstat != 0) 369 raw3215_next_io(raw); 370 if (dstat & 0x01) { /* we got a unit exception */ 371 dstat &= ~0x01; /* we can ignore it */ 372 } 373 switch (dstat) { 374 case 0x80: 375 if (cstat != 0) 376 break; 377 /* Attention interrupt, someone hit the enter key */ 378 raw3215_mk_read_req(raw); 379 raw3215_next_io(raw); 380 break; 381 case 0x08: 382 case 0x0C: 383 /* Channel end interrupt. */ 384 if ((raw = req->info) == NULL) 385 return; /* That shouldn't happen ... */ 386 if (req->type == RAW3215_READ) { 387 /* store residual count, then wait for device end */ 388 req->residual = irb->scsw.cmd.count; 389 } 390 if (dstat == 0x08) 391 break; 392 case 0x04: 393 /* Device end interrupt. */ 394 if ((raw = req->info) == NULL) 395 return; /* That shouldn't happen ... */ 396 if (req->type == RAW3215_READ && raw->tty != NULL) { 397 unsigned int cchar; 398 399 tty = raw->tty; 400 count = 160 - req->residual; 401 EBCASC(raw->inbuf, count); 402 cchar = ctrlchar_handle(raw->inbuf, count, tty); 403 switch (cchar & CTRLCHAR_MASK) { 404 case CTRLCHAR_SYSRQ: 405 break; 406 407 case CTRLCHAR_CTRL: 408 tty_insert_flip_char(tty, cchar, TTY_NORMAL); 409 tty_flip_buffer_push(raw->tty); 410 break; 411 412 case CTRLCHAR_NONE: 413 if (count < 2 || 414 (strncmp(raw->inbuf+count-2, "\252n", 2) && 415 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 416 /* add the auto \n */ 417 raw->inbuf[count] = '\n'; 418 count++; 419 } else 420 count -= 2; 421 tty_insert_flip_string(tty, raw->inbuf, count); 422 tty_flip_buffer_push(raw->tty); 423 break; 424 } 425 } else if (req->type == RAW3215_WRITE) { 426 raw->count -= req->len; 427 raw->written -= req->len; 428 } 429 raw->flags &= ~RAW3215_WORKING; 430 raw3215_free_req(req); 431 /* check for empty wait */ 432 if (waitqueue_active(&raw->empty_wait) && 433 raw->queued_write == NULL && 434 raw->queued_read == NULL) { 435 wake_up_interruptible(&raw->empty_wait); 436 } 437 raw3215_next_io(raw); 438 break; 439 default: 440 /* Strange interrupt, I'll do my best to clean up */ 441 if (req != NULL && req->type != RAW3215_FREE) { 442 if (req->type == RAW3215_WRITE) { 443 raw->count -= req->len; 444 raw->written -= req->len; 445 } 446 raw->flags &= ~RAW3215_WORKING; 447 raw3215_free_req(req); 448 } 449 raw3215_next_io(raw); 450 } 451 return; 452} 453 454/* 455 * Drop the oldest line from the output buffer. 456 */ 457static void raw3215_drop_line(struct raw3215_info *raw) 458{ 459 int ix; 460 char ch; 461 462 BUG_ON(raw->written != 0); 463 ix = (raw->head - raw->count) & (RAW3215_BUFFER_SIZE - 1); 464 while (raw->count > 0) { 465 ch = raw->buffer[ix]; 466 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 467 raw->count--; 468 if (ch == 0x15) 469 break; 470 } 471 raw->head = ix; 472} 473 474/* 475 * Wait until length bytes are available int the output buffer. 476 * Has to be called with the s390irq lock held. Can be called 477 * disabled. 478 */ 479static void raw3215_make_room(struct raw3215_info *raw, unsigned int length) 480{ 481 while (RAW3215_BUFFER_SIZE - raw->count < length) { 482 /* While console is frozen for suspend we have no other 483 * choice but to drop message from the buffer to make 484 * room for even more messages. */ 485 if (raw->flags & RAW3215_FROZEN) { 486 raw3215_drop_line(raw); 487 continue; 488 } 489 /* there might be a request pending */ 490 raw->flags |= RAW3215_FLUSHING; 491 raw3215_mk_write_req(raw); 492 raw3215_try_io(raw); 493 raw->flags &= ~RAW3215_FLUSHING; 494#ifdef CONFIG_TN3215_CONSOLE 495 wait_cons_dev(); 496#endif 497 /* Enough room freed up ? */ 498 if (RAW3215_BUFFER_SIZE - raw->count >= length) 499 break; 500 /* there might be another cpu waiting for the lock */ 501 spin_unlock(get_ccwdev_lock(raw->cdev)); 502 udelay(100); 503 spin_lock(get_ccwdev_lock(raw->cdev)); 504 } 505} 506 507/* 508 * String write routine for 3215 devices 509 */ 510static void raw3215_write(struct raw3215_info *raw, const char *str, 511 unsigned int length) 512{ 513 unsigned long flags; 514 int c, count; 515 516 while (length > 0) { 517 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 518 count = (length > RAW3215_BUFFER_SIZE) ? 519 RAW3215_BUFFER_SIZE : length; 520 length -= count; 521 522 raw3215_make_room(raw, count); 523 524 /* copy string to output buffer and convert it to EBCDIC */ 525 while (1) { 526 c = min_t(int, count, 527 min(RAW3215_BUFFER_SIZE - raw->count, 528 RAW3215_BUFFER_SIZE - raw->head)); 529 if (c <= 0) 530 break; 531 memcpy(raw->buffer + raw->head, str, c); 532 ASCEBC(raw->buffer + raw->head, c); 533 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 534 raw->count += c; 535 raw->line_pos += c; 536 str += c; 537 count -= c; 538 } 539 if (!(raw->flags & RAW3215_WORKING)) { 540 raw3215_mk_write_req(raw); 541 /* start or queue request */ 542 raw3215_try_io(raw); 543 } 544 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 545 } 546} 547 548/* 549 * Put character routine for 3215 devices 550 */ 551static void raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 552{ 553 unsigned long flags; 554 unsigned int length, i; 555 556 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 557 if (ch == '\t') { 558 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 559 raw->line_pos += length; 560 ch = ' '; 561 } else if (ch == '\n') { 562 length = 1; 563 raw->line_pos = 0; 564 } else { 565 length = 1; 566 raw->line_pos++; 567 } 568 raw3215_make_room(raw, length); 569 570 for (i = 0; i < length; i++) { 571 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 572 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 573 raw->count++; 574 } 575 if (!(raw->flags & RAW3215_WORKING)) { 576 raw3215_mk_write_req(raw); 577 /* start or queue request */ 578 raw3215_try_io(raw); 579 } 580 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 581} 582 583/* 584 * Flush routine, it simply sets the flush flag and tries to start 585 * pending IO. 586 */ 587static void raw3215_flush_buffer(struct raw3215_info *raw) 588{ 589 unsigned long flags; 590 591 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 592 if (raw->count > 0) { 593 raw->flags |= RAW3215_FLUSHING; 594 raw3215_try_io(raw); 595 raw->flags &= ~RAW3215_FLUSHING; 596 } 597 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 598} 599 600/* 601 * Fire up a 3215 device. 602 */ 603static int raw3215_startup(struct raw3215_info *raw) 604{ 605 unsigned long flags; 606 607 if (raw->flags & RAW3215_ACTIVE) 608 return 0; 609 raw->line_pos = 0; 610 raw->flags |= RAW3215_ACTIVE; 611 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 612 raw3215_try_io(raw); 613 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 614 615 return 0; 616} 617 618/* 619 * Shutdown a 3215 device. 620 */ 621static void raw3215_shutdown(struct raw3215_info *raw) 622{ 623 DECLARE_WAITQUEUE(wait, current); 624 unsigned long flags; 625 626 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) 627 return; 628 /* Wait for outstanding requests, then free irq */ 629 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 630 if ((raw->flags & RAW3215_WORKING) || 631 raw->queued_write != NULL || 632 raw->queued_read != NULL) { 633 raw->flags |= RAW3215_CLOSING; 634 add_wait_queue(&raw->empty_wait, &wait); 635 set_current_state(TASK_INTERRUPTIBLE); 636 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 637 schedule(); 638 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 639 remove_wait_queue(&raw->empty_wait, &wait); 640 set_current_state(TASK_RUNNING); 641 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); 642 } 643 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 644} 645 646static int raw3215_probe (struct ccw_device *cdev) 647{ 648 struct raw3215_info *raw; 649 int line; 650 651 /* Console is special. */ 652 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev))) 653 return 0; 654 raw = kmalloc(sizeof(struct raw3215_info) + 655 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); 656 if (raw == NULL) 657 return -ENOMEM; 658 659 spin_lock(&raw3215_device_lock); 660 for (line = 0; line < NR_3215; line++) { 661 if (!raw3215[line]) { 662 raw3215[line] = raw; 663 break; 664 } 665 } 666 spin_unlock(&raw3215_device_lock); 667 if (line == NR_3215) { 668 kfree(raw); 669 return -ENODEV; 670 } 671 672 raw->cdev = cdev; 673 raw->inbuf = (char *) raw + sizeof(struct raw3215_info); 674 memset(raw, 0, sizeof(struct raw3215_info)); 675 raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, 676 GFP_KERNEL|GFP_DMA); 677 if (raw->buffer == NULL) { 678 spin_lock(&raw3215_device_lock); 679 raw3215[line] = NULL; 680 spin_unlock(&raw3215_device_lock); 681 kfree(raw); 682 return -ENOMEM; 683 } 684 init_waitqueue_head(&raw->empty_wait); 685 686 dev_set_drvdata(&cdev->dev, raw); 687 cdev->handler = raw3215_irq; 688 689 return 0; 690} 691 692static void raw3215_remove (struct ccw_device *cdev) 693{ 694 struct raw3215_info *raw; 695 696 ccw_device_set_offline(cdev); 697 raw = dev_get_drvdata(&cdev->dev); 698 if (raw) { 699 dev_set_drvdata(&cdev->dev, NULL); 700 kfree(raw->buffer); 701 kfree(raw); 702 } 703} 704 705static int raw3215_set_online (struct ccw_device *cdev) 706{ 707 struct raw3215_info *raw; 708 709 raw = dev_get_drvdata(&cdev->dev); 710 if (!raw) 711 return -ENODEV; 712 713 return raw3215_startup(raw); 714} 715 716static int raw3215_set_offline (struct ccw_device *cdev) 717{ 718 struct raw3215_info *raw; 719 720 raw = dev_get_drvdata(&cdev->dev); 721 if (!raw) 722 return -ENODEV; 723 724 raw3215_shutdown(raw); 725 726 return 0; 727} 728 729static int raw3215_pm_stop(struct ccw_device *cdev) 730{ 731 struct raw3215_info *raw; 732 unsigned long flags; 733 734 /* Empty the output buffer, then prevent new I/O. */ 735 raw = dev_get_drvdata(&cdev->dev); 736 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 737 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 738 raw->flags |= RAW3215_FROZEN; 739 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 740 return 0; 741} 742 743static int raw3215_pm_start(struct ccw_device *cdev) 744{ 745 struct raw3215_info *raw; 746 unsigned long flags; 747 748 /* Allow I/O again and flush output buffer. */ 749 raw = dev_get_drvdata(&cdev->dev); 750 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 751 raw->flags &= ~RAW3215_FROZEN; 752 raw->flags |= RAW3215_FLUSHING; 753 raw3215_try_io(raw); 754 raw->flags &= ~RAW3215_FLUSHING; 755 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 756 return 0; 757} 758 759static struct ccw_device_id raw3215_id[] = { 760 { CCW_DEVICE(0x3215, 0) }, 761 { /* end of list */ }, 762}; 763 764static struct ccw_driver raw3215_ccw_driver = { 765 .name = "3215", 766 .owner = THIS_MODULE, 767 .ids = raw3215_id, 768 .probe = &raw3215_probe, 769 .remove = &raw3215_remove, 770 .set_online = &raw3215_set_online, 771 .set_offline = &raw3215_set_offline, 772 .freeze = &raw3215_pm_stop, 773 .thaw = &raw3215_pm_start, 774 .restore = &raw3215_pm_start, 775}; 776 777#ifdef CONFIG_TN3215_CONSOLE 778/* 779 * Write a string to the 3215 console 780 */ 781static void con3215_write(struct console *co, const char *str, 782 unsigned int count) 783{ 784 struct raw3215_info *raw; 785 int i; 786 787 if (count <= 0) 788 return; 789 raw = raw3215[0]; /* console 3215 is the first one */ 790 while (count > 0) { 791 for (i = 0; i < count; i++) 792 if (str[i] == '\t' || str[i] == '\n') 793 break; 794 raw3215_write(raw, str, i); 795 count -= i; 796 str += i; 797 if (count > 0) { 798 raw3215_putchar(raw, *str); 799 count--; 800 str++; 801 } 802 } 803} 804 805static struct tty_driver *con3215_device(struct console *c, int *index) 806{ 807 *index = c->index; 808 return tty3215_driver; 809} 810 811/* 812 * panic() calls con3215_flush through a panic_notifier 813 * before the system enters a disabled, endless loop. 814 */ 815static void con3215_flush(void) 816{ 817 struct raw3215_info *raw; 818 unsigned long flags; 819 820 raw = raw3215[0]; /* console 3215 is the first one */ 821 if (raw->flags & RAW3215_FROZEN) 822 /* The console is still frozen for suspend. */ 823 if (ccw_device_force_console()) 824 /* Forcing didn't work, no panic message .. */ 825 return; 826 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 827 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 828 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 829} 830 831static int con3215_notify(struct notifier_block *self, 832 unsigned long event, void *data) 833{ 834 con3215_flush(); 835 return NOTIFY_OK; 836} 837 838static struct notifier_block on_panic_nb = { 839 .notifier_call = con3215_notify, 840 .priority = 0, 841}; 842 843static struct notifier_block on_reboot_nb = { 844 .notifier_call = con3215_notify, 845 .priority = 0, 846}; 847 848/* 849 * The console structure for the 3215 console 850 */ 851static struct console con3215 = { 852 .name = "ttyS", 853 .write = con3215_write, 854 .device = con3215_device, 855 .flags = CON_PRINTBUFFER, 856}; 857 858/* 859 * 3215 console initialization code called from console_init(). 860 */ 861static int __init con3215_init(void) 862{ 863 struct ccw_device *cdev; 864 struct raw3215_info *raw; 865 struct raw3215_req *req; 866 int i; 867 868 /* Check if 3215 is to be the console */ 869 if (!CONSOLE_IS_3215) 870 return -ENODEV; 871 872 /* Set the console mode for VM */ 873 if (MACHINE_IS_VM) { 874 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 875 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 876 } 877 878 /* allocate 3215 request structures */ 879 raw3215_freelist = NULL; 880 spin_lock_init(&raw3215_freelist_lock); 881 for (i = 0; i < NR_3215_REQ; i++) { 882 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA); 883 req->next = raw3215_freelist; 884 raw3215_freelist = req; 885 } 886 887 cdev = ccw_device_probe_console(); 888 if (IS_ERR(cdev)) 889 return -ENODEV; 890 891 raw3215[0] = raw = (struct raw3215_info *) 892 kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA); 893 raw->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 894 raw->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA); 895 raw->cdev = cdev; 896 dev_set_drvdata(&cdev->dev, raw); 897 cdev->handler = raw3215_irq; 898 899 raw->flags |= RAW3215_FIXED; 900 init_waitqueue_head(&raw->empty_wait); 901 902 /* Request the console irq */ 903 if (raw3215_startup(raw) != 0) { 904 kfree(raw->inbuf); 905 kfree(raw->buffer); 906 kfree(raw); 907 raw3215[0] = NULL; 908 return -ENODEV; 909 } 910 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 911 register_reboot_notifier(&on_reboot_nb); 912 register_console(&con3215); 913 return 0; 914} 915console_initcall(con3215_init); 916#endif 917 918/* 919 * tty3215_open 920 * 921 * This routine is called whenever a 3215 tty is opened. 922 */ 923static int tty3215_open(struct tty_struct *tty, struct file * filp) 924{ 925 struct raw3215_info *raw; 926 int retval, line; 927 928 line = tty->index; 929 if ((line < 0) || (line >= NR_3215)) 930 return -ENODEV; 931 932 raw = raw3215[line]; 933 if (raw == NULL) 934 return -ENODEV; 935 936 tty->driver_data = raw; 937 raw->tty = tty; 938 939 tty->low_latency = 0; /* don't use bottom half for pushing chars */ 940 /* 941 * Start up 3215 device 942 */ 943 retval = raw3215_startup(raw); 944 if (retval) 945 return retval; 946 947 return 0; 948} 949 950/* 951 * tty3215_close() 952 * 953 * This routine is called when the 3215 tty is closed. We wait 954 * for the remaining request to be completed. Then we clean up. 955 */ 956static void tty3215_close(struct tty_struct *tty, struct file * filp) 957{ 958 struct raw3215_info *raw; 959 960 raw = (struct raw3215_info *) tty->driver_data; 961 if (raw == NULL || tty->count > 1) 962 return; 963 tty->closing = 1; 964 /* Shutdown the terminal */ 965 raw3215_shutdown(raw); 966 tty->closing = 0; 967 raw->tty = NULL; 968} 969 970/* 971 * Returns the amount of free space in the output buffer. 972 */ 973static int tty3215_write_room(struct tty_struct *tty) 974{ 975 struct raw3215_info *raw; 976 977 raw = (struct raw3215_info *) tty->driver_data; 978 979 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 980 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 981 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 982 else 983 return 0; 984} 985 986/* 987 * String write routine for 3215 ttys 988 */ 989static int tty3215_write(struct tty_struct * tty, 990 const unsigned char *buf, int count) 991{ 992 struct raw3215_info *raw; 993 994 if (!tty) 995 return 0; 996 raw = (struct raw3215_info *) tty->driver_data; 997 raw3215_write(raw, buf, count); 998 return count; 999} 1000 1001/* 1002 * Put character routine for 3215 ttys 1003 */ 1004static int tty3215_put_char(struct tty_struct *tty, unsigned char ch) 1005{ 1006 struct raw3215_info *raw; 1007 1008 if (!tty) 1009 return 0; 1010 raw = (struct raw3215_info *) tty->driver_data; 1011 raw3215_putchar(raw, ch); 1012 return 1; 1013} 1014 1015static void tty3215_flush_chars(struct tty_struct *tty) 1016{ 1017} 1018 1019/* 1020 * Returns the number of characters in the output buffer 1021 */ 1022static int tty3215_chars_in_buffer(struct tty_struct *tty) 1023{ 1024 struct raw3215_info *raw; 1025 1026 raw = (struct raw3215_info *) tty->driver_data; 1027 return raw->count; 1028} 1029 1030static void tty3215_flush_buffer(struct tty_struct *tty) 1031{ 1032 struct raw3215_info *raw; 1033 1034 raw = (struct raw3215_info *) tty->driver_data; 1035 raw3215_flush_buffer(raw); 1036 tty_wakeup(tty); 1037} 1038 1039/* 1040 * Disable reading from a 3215 tty 1041 */ 1042static void tty3215_throttle(struct tty_struct * tty) 1043{ 1044 struct raw3215_info *raw; 1045 1046 raw = (struct raw3215_info *) tty->driver_data; 1047 raw->flags |= RAW3215_THROTTLED; 1048} 1049 1050/* 1051 * Enable reading from a 3215 tty 1052 */ 1053static void tty3215_unthrottle(struct tty_struct * tty) 1054{ 1055 struct raw3215_info *raw; 1056 unsigned long flags; 1057 1058 raw = (struct raw3215_info *) tty->driver_data; 1059 if (raw->flags & RAW3215_THROTTLED) { 1060 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1061 raw->flags &= ~RAW3215_THROTTLED; 1062 raw3215_try_io(raw); 1063 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1064 } 1065} 1066 1067/* 1068 * Disable writing to a 3215 tty 1069 */ 1070static void tty3215_stop(struct tty_struct *tty) 1071{ 1072 struct raw3215_info *raw; 1073 1074 raw = (struct raw3215_info *) tty->driver_data; 1075 raw->flags |= RAW3215_STOPPED; 1076} 1077 1078/* 1079 * Enable writing to a 3215 tty 1080 */ 1081static void tty3215_start(struct tty_struct *tty) 1082{ 1083 struct raw3215_info *raw; 1084 unsigned long flags; 1085 1086 raw = (struct raw3215_info *) tty->driver_data; 1087 if (raw->flags & RAW3215_STOPPED) { 1088 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1089 raw->flags &= ~RAW3215_STOPPED; 1090 raw3215_try_io(raw); 1091 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1092 } 1093} 1094 1095static const struct tty_operations tty3215_ops = { 1096 .open = tty3215_open, 1097 .close = tty3215_close, 1098 .write = tty3215_write, 1099 .put_char = tty3215_put_char, 1100 .flush_chars = tty3215_flush_chars, 1101 .write_room = tty3215_write_room, 1102 .chars_in_buffer = tty3215_chars_in_buffer, 1103 .flush_buffer = tty3215_flush_buffer, 1104 .throttle = tty3215_throttle, 1105 .unthrottle = tty3215_unthrottle, 1106 .stop = tty3215_stop, 1107 .start = tty3215_start, 1108}; 1109 1110/* 1111 * 3215 tty registration code called from tty_init(). 1112 * Most kernel services (incl. kmalloc) are available at this poimt. 1113 */ 1114static int __init tty3215_init(void) 1115{ 1116 struct tty_driver *driver; 1117 int ret; 1118 1119 if (!CONSOLE_IS_3215) 1120 return 0; 1121 1122 driver = alloc_tty_driver(NR_3215); 1123 if (!driver) 1124 return -ENOMEM; 1125 1126 ret = ccw_driver_register(&raw3215_ccw_driver); 1127 if (ret) { 1128 put_tty_driver(driver); 1129 return ret; 1130 } 1131 /* 1132 * Initialize the tty_driver structure 1133 * Entries in tty3215_driver that are NOT initialized: 1134 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1135 */ 1136 1137 driver->owner = THIS_MODULE; 1138 driver->driver_name = "tty3215"; 1139 driver->name = "ttyS"; 1140 driver->major = TTY_MAJOR; 1141 driver->minor_start = 64; 1142 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1143 driver->subtype = SYSTEM_TYPE_TTY; 1144 driver->init_termios = tty_std_termios; 1145 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1146 driver->init_termios.c_oflag = ONLCR | XTABS; 1147 driver->init_termios.c_lflag = ISIG; 1148 driver->flags = TTY_DRIVER_REAL_RAW; 1149 tty_set_operations(driver, &tty3215_ops); 1150 ret = tty_register_driver(driver); 1151 if (ret) { 1152 put_tty_driver(driver); 1153 return ret; 1154 } 1155 tty3215_driver = driver; 1156 return 0; 1157} 1158 1159static void __exit tty3215_exit(void) 1160{ 1161 tty_unregister_driver(tty3215_driver); 1162 put_tty_driver(tty3215_driver); 1163 ccw_driver_unregister(&raw3215_ccw_driver); 1164} 1165 1166module_init(tty3215_init); 1167module_exit(tty3215_exit); 1168