1/* 2 * drivers/s390/char/con3215.c 3 * 3215 line mode terminal driver. 4 * 5 * S390 version 6 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 8 * 9 * Updated: 10 * Aug-2000: Added tab support 11 * Dan Morrison, IBM Corporation (dmorriso@cse.buffalo.edu) 12 */ 13 14#include <linux/module.h> 15#include <linux/types.h> 16#include <linux/kdev_t.h> 17#include <linux/tty.h> 18#include <linux/tty_flip.h> 19#include <linux/vt_kern.h> 20#include <linux/init.h> 21#include <linux/console.h> 22#include <linux/interrupt.h> 23#include <linux/err.h> 24 25#include <linux/slab.h> 26#include <linux/bootmem.h> 27 28#include <asm/ccwdev.h> 29#include <asm/cio.h> 30#include <asm/io.h> 31#include <asm/ebcdic.h> 32#include <asm/uaccess.h> 33#include <asm/delay.h> 34#include <asm/cpcmd.h> 35#include <asm/setup.h> 36 37#include "ctrlchar.h" 38 39#define NR_3215 1 40#define NR_3215_REQ (4*NR_3215) 41#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */ 42#define RAW3215_INBUF_SIZE 256 /* input buffer size */ 43#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */ 44#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */ 45#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */ 46#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */ 47#define RAW3215_NR_CCWS 3 48#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ 49 50#define RAW3215_FIXED 1 /* 3215 console device is not be freed */ 51#define RAW3215_ACTIVE 2 /* set if the device is in use */ 52#define RAW3215_WORKING 4 /* set if a request is being worked on */ 53#define RAW3215_THROTTLED 8 /* set if reading is disabled */ 54#define RAW3215_STOPPED 16 /* set if writing is disabled */ 55#define RAW3215_CLOSING 32 /* set while in close process */ 56#define RAW3215_TIMER_RUNS 64 /* set if the output delay timer is on */ 57#define RAW3215_FLUSHING 128 /* set to flush buffer (no delay) */ 58 59#define TAB_STOP_SIZE 8 /* tab stop size */ 60 61/* 62 * Request types for a 3215 device 63 */ 64enum raw3215_type { 65 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE 66}; 67 68/* 69 * Request structure for a 3215 device 70 */ 71struct raw3215_req { 72 enum raw3215_type type; /* type of the request */ 73 int start, len; /* start index & len in output buffer */ 74 int delayable; /* indication to wait for more data */ 75 int residual; /* residual count for read request */ 76 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */ 77 struct raw3215_info *info; /* pointer to main structure */ 78 struct raw3215_req *next; /* pointer to next request */ 79} __attribute__ ((aligned(8))); 80 81struct raw3215_info { 82 struct ccw_device *cdev; /* device for tty driver */ 83 spinlock_t *lock; /* pointer to irq lock */ 84 int flags; /* state flags */ 85 char *buffer; /* pointer to output buffer */ 86 char *inbuf; /* pointer to input buffer */ 87 int head; /* first free byte in output buffer */ 88 int count; /* number of bytes in output buffer */ 89 int written; /* number of bytes in write requests */ 90 struct tty_struct *tty; /* pointer to tty structure if present */ 91 struct tasklet_struct tasklet; 92 struct raw3215_req *queued_read; /* pointer to queued read requests */ 93 struct raw3215_req *queued_write;/* pointer to queued write requests */ 94 wait_queue_head_t empty_wait; /* wait queue for flushing */ 95 struct timer_list timer; /* timer for delayed output */ 96 char *message; /* pending message from raw3215_irq */ 97 int msg_dstat; /* dstat for pending message */ 98 int msg_cstat; /* cstat for pending message */ 99 int line_pos; /* position on the line (for tabs) */ 100 char ubuffer[80]; /* copy_from_user buffer */ 101}; 102 103/* array of 3215 devices structures */ 104static struct raw3215_info *raw3215[NR_3215]; 105/* spinlock to protect the raw3215 array */ 106static DEFINE_SPINLOCK(raw3215_device_lock); 107/* list of free request structures */ 108static struct raw3215_req *raw3215_freelist; 109/* spinlock to protect free list */ 110static spinlock_t raw3215_freelist_lock; 111 112static struct tty_driver *tty3215_driver; 113 114/* 115 * Get a request structure from the free list 116 */ 117static inline struct raw3215_req * 118raw3215_alloc_req(void) { 119 struct raw3215_req *req; 120 unsigned long flags; 121 122 spin_lock_irqsave(&raw3215_freelist_lock, flags); 123 req = raw3215_freelist; 124 raw3215_freelist = req->next; 125 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 126 return req; 127} 128 129/* 130 * Put a request structure back to the free list 131 */ 132static inline void 133raw3215_free_req(struct raw3215_req *req) { 134 unsigned long flags; 135 136 if (req->type == RAW3215_FREE) 137 return; /* don't free a free request */ 138 req->type = RAW3215_FREE; 139 spin_lock_irqsave(&raw3215_freelist_lock, flags); 140 req->next = raw3215_freelist; 141 raw3215_freelist = req; 142 spin_unlock_irqrestore(&raw3215_freelist_lock, flags); 143} 144 145/* 146 * Set up a read request that reads up to 160 byte from the 3215 device. 147 * If there is a queued read request it is used, but that shouldn't happen 148 * because a 3215 terminal won't accept a new read before the old one is 149 * completed. 150 */ 151static void 152raw3215_mk_read_req(struct raw3215_info *raw) 153{ 154 struct raw3215_req *req; 155 struct ccw1 *ccw; 156 157 /* there can only be ONE read request at a time */ 158 req = raw->queued_read; 159 if (req == NULL) { 160 /* no queued read request, use new req structure */ 161 req = raw3215_alloc_req(); 162 req->type = RAW3215_READ; 163 req->info = raw; 164 raw->queued_read = req; 165 } 166 167 ccw = req->ccws; 168 ccw->cmd_code = 0x0A; /* read inquiry */ 169 ccw->flags = 0x20; /* ignore incorrect length */ 170 ccw->count = 160; 171 ccw->cda = (__u32) __pa(raw->inbuf); 172} 173 174/* 175 * Set up a write request with the information from the main structure. 176 * A ccw chain is created that writes as much as possible from the output 177 * buffer to the 3215 device. If a queued write exists it is replaced by 178 * the new, probably lengthened request. 179 */ 180static void 181raw3215_mk_write_req(struct raw3215_info *raw) 182{ 183 struct raw3215_req *req; 184 struct ccw1 *ccw; 185 int len, count, ix, lines; 186 187 if (raw->count <= raw->written) 188 return; 189 /* check if there is a queued write request */ 190 req = raw->queued_write; 191 if (req == NULL) { 192 /* no queued write request, use new req structure */ 193 req = raw3215_alloc_req(); 194 req->type = RAW3215_WRITE; 195 req->info = raw; 196 raw->queued_write = req; 197 } else { 198 raw->written -= req->len; 199 } 200 201 ccw = req->ccws; 202 req->start = (raw->head - raw->count + raw->written) & 203 (RAW3215_BUFFER_SIZE - 1); 204 /* 205 * now we have to count newlines. We can at max accept 206 * RAW3215_MAX_NEWLINE newlines in a single ssch due to 207 * a restriction in VM 208 */ 209 lines = 0; 210 ix = req->start; 211 while (lines < RAW3215_MAX_NEWLINE && ix != raw->head) { 212 if (raw->buffer[ix] == 0x15) 213 lines++; 214 ix = (ix + 1) & (RAW3215_BUFFER_SIZE - 1); 215 } 216 len = ((ix - 1 - req->start) & (RAW3215_BUFFER_SIZE - 1)) + 1; 217 if (len > RAW3215_MAX_BYTES) 218 len = RAW3215_MAX_BYTES; 219 req->len = len; 220 raw->written += len; 221 222 /* set the indication if we should try to enlarge this request */ 223 req->delayable = (ix == raw->head) && (len < RAW3215_MIN_WRITE); 224 225 ix = req->start; 226 while (len > 0) { 227 if (ccw > req->ccws) 228 ccw[-1].flags |= 0x40; /* use command chaining */ 229 ccw->cmd_code = 0x01; /* write, auto carrier return */ 230 ccw->flags = 0x20; /* ignore incorrect length ind. */ 231 ccw->cda = 232 (__u32) __pa(raw->buffer + ix); 233 count = len; 234 if (ix + count > RAW3215_BUFFER_SIZE) 235 count = RAW3215_BUFFER_SIZE - ix; 236 ccw->count = count; 237 len -= count; 238 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1); 239 ccw++; 240 } 241 /* 242 * Add a NOP to the channel program. 3215 devices are purely 243 * emulated and its much better to avoid the channel end 244 * interrupt in this case. 245 */ 246 if (ccw > req->ccws) 247 ccw[-1].flags |= 0x40; /* use command chaining */ 248 ccw->cmd_code = 0x03; /* NOP */ 249 ccw->flags = 0; 250 ccw->cda = 0; 251 ccw->count = 1; 252} 253 254/* 255 * Start a read or a write request 256 */ 257static void 258raw3215_start_io(struct raw3215_info *raw) 259{ 260 struct raw3215_req *req; 261 int res; 262 263 req = raw->queued_read; 264 if (req != NULL && 265 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) { 266 /* dequeue request */ 267 raw->queued_read = NULL; 268 res = ccw_device_start(raw->cdev, req->ccws, 269 (unsigned long) req, 0, 0); 270 if (res != 0) { 271 /* do_IO failed, put request back to queue */ 272 raw->queued_read = req; 273 } else { 274 raw->flags |= RAW3215_WORKING; 275 } 276 } 277 req = raw->queued_write; 278 if (req != NULL && 279 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) { 280 /* dequeue request */ 281 raw->queued_write = NULL; 282 res = ccw_device_start(raw->cdev, req->ccws, 283 (unsigned long) req, 0, 0); 284 if (res != 0) { 285 /* do_IO failed, put request back to queue */ 286 raw->queued_write = req; 287 } else { 288 raw->flags |= RAW3215_WORKING; 289 } 290 } 291} 292 293/* 294 * Function to start a delayed output after RAW3215_TIMEOUT seconds 295 */ 296static void 297raw3215_timeout(unsigned long __data) 298{ 299 struct raw3215_info *raw = (struct raw3215_info *) __data; 300 unsigned long flags; 301 302 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 303 if (raw->flags & RAW3215_TIMER_RUNS) { 304 del_timer(&raw->timer); 305 raw->flags &= ~RAW3215_TIMER_RUNS; 306 raw3215_mk_write_req(raw); 307 raw3215_start_io(raw); 308 } 309 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 310} 311 312/* 313 * Function to conditionally start an IO. A read is started immediately, 314 * a write is only started immediately if the flush flag is on or the 315 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not 316 * done immediately a timer is started with a delay of RAW3215_TIMEOUT. 317 */ 318static inline void 319raw3215_try_io(struct raw3215_info *raw) 320{ 321 if (!(raw->flags & RAW3215_ACTIVE)) 322 return; 323 if (raw->queued_read != NULL) 324 raw3215_start_io(raw); 325 else if (raw->queued_write != NULL) { 326 if ((raw->queued_write->delayable == 0) || 327 (raw->flags & RAW3215_FLUSHING)) { 328 /* execute write requests bigger than minimum size */ 329 raw3215_start_io(raw); 330 if (raw->flags & RAW3215_TIMER_RUNS) { 331 del_timer(&raw->timer); 332 raw->flags &= ~RAW3215_TIMER_RUNS; 333 } 334 } else if (!(raw->flags & RAW3215_TIMER_RUNS)) { 335 /* delay small writes */ 336 init_timer(&raw->timer); 337 raw->timer.expires = RAW3215_TIMEOUT + jiffies; 338 raw->timer.data = (unsigned long) raw; 339 raw->timer.function = raw3215_timeout; 340 add_timer(&raw->timer); 341 raw->flags |= RAW3215_TIMER_RUNS; 342 } 343 } 344} 345 346/* 347 * The bottom half handler routine for 3215 devices. It tries to start 348 * the next IO and wakes up processes waiting on the tty. 349 */ 350static void 351raw3215_tasklet(void *data) 352{ 353 struct raw3215_info *raw; 354 struct tty_struct *tty; 355 unsigned long flags; 356 357 raw = (struct raw3215_info *) data; 358 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 359 raw3215_mk_write_req(raw); 360 raw3215_try_io(raw); 361 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 362 /* Check for pending message from raw3215_irq */ 363 if (raw->message != NULL) { 364 printk(raw->message, raw->msg_dstat, raw->msg_cstat); 365 raw->message = NULL; 366 } 367 tty = raw->tty; 368 if (tty != NULL && 369 RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { 370 tty_wakeup(tty); 371 } 372} 373 374/* 375 * Interrupt routine, called from common io layer 376 */ 377static void 378raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) 379{ 380 struct raw3215_info *raw; 381 struct raw3215_req *req; 382 struct tty_struct *tty; 383 int cstat, dstat; 384 int count, slen; 385 386 raw = cdev->dev.driver_data; 387 req = (struct raw3215_req *) intparm; 388 cstat = irb->scsw.cstat; 389 dstat = irb->scsw.dstat; 390 if (cstat != 0) { 391 raw->message = KERN_WARNING 392 "Got nonzero channel status in raw3215_irq " 393 "(dev sts 0x%2x, sch sts 0x%2x)"; 394 raw->msg_dstat = dstat; 395 raw->msg_cstat = cstat; 396 tasklet_schedule(&raw->tasklet); 397 } 398 if (dstat & 0x01) { /* we got a unit exception */ 399 dstat &= ~0x01; /* we can ignore it */ 400 } 401 switch (dstat) { 402 case 0x80: 403 if (cstat != 0) 404 break; 405 /* Attention interrupt, someone hit the enter key */ 406 raw3215_mk_read_req(raw); 407 if (MACHINE_IS_P390) 408 memset(raw->inbuf, 0, RAW3215_INBUF_SIZE); 409 tasklet_schedule(&raw->tasklet); 410 break; 411 case 0x08: 412 case 0x0C: 413 /* Channel end interrupt. */ 414 if ((raw = req->info) == NULL) 415 return; /* That shouldn't happen ... */ 416 if (req->type == RAW3215_READ) { 417 /* store residual count, then wait for device end */ 418 req->residual = irb->scsw.count; 419 } 420 if (dstat == 0x08) 421 break; 422 case 0x04: 423 /* Device end interrupt. */ 424 if ((raw = req->info) == NULL) 425 return; /* That shouldn't happen ... */ 426 if (req->type == RAW3215_READ && raw->tty != NULL) { 427 unsigned int cchar; 428 429 tty = raw->tty; 430 count = 160 - req->residual; 431 if (MACHINE_IS_P390) { 432 slen = strnlen(raw->inbuf, RAW3215_INBUF_SIZE); 433 if (count > slen) 434 count = slen; 435 } else 436 EBCASC(raw->inbuf, count); 437 cchar = ctrlchar_handle(raw->inbuf, count, tty); 438 switch (cchar & CTRLCHAR_MASK) { 439 case CTRLCHAR_SYSRQ: 440 break; 441 442 case CTRLCHAR_CTRL: 443 tty_insert_flip_char(tty, cchar, TTY_NORMAL); 444 tty_flip_buffer_push(raw->tty); 445 break; 446 447 case CTRLCHAR_NONE: 448 if (count < 2 || 449 (strncmp(raw->inbuf+count-2, "\252n", 2) && 450 strncmp(raw->inbuf+count-2, "^n", 2)) ) { 451 /* add the auto \n */ 452 raw->inbuf[count] = '\n'; 453 count++; 454 } else 455 count -= 2; 456 tty_insert_flip_string(tty, raw->inbuf, count); 457 tty_flip_buffer_push(raw->tty); 458 break; 459 } 460 } else if (req->type == RAW3215_WRITE) { 461 raw->count -= req->len; 462 raw->written -= req->len; 463 } 464 raw->flags &= ~RAW3215_WORKING; 465 raw3215_free_req(req); 466 /* check for empty wait */ 467 if (waitqueue_active(&raw->empty_wait) && 468 raw->queued_write == NULL && 469 raw->queued_read == NULL) { 470 wake_up_interruptible(&raw->empty_wait); 471 } 472 tasklet_schedule(&raw->tasklet); 473 break; 474 default: 475 /* Strange interrupt, I'll do my best to clean up */ 476 if (req != NULL && req->type != RAW3215_FREE) { 477 if (req->type == RAW3215_WRITE) { 478 raw->count -= req->len; 479 raw->written -= req->len; 480 } 481 raw->flags &= ~RAW3215_WORKING; 482 raw3215_free_req(req); 483 } 484 raw->message = KERN_WARNING 485 "Spurious interrupt in in raw3215_irq " 486 "(dev sts 0x%2x, sch sts 0x%2x)"; 487 raw->msg_dstat = dstat; 488 raw->msg_cstat = cstat; 489 tasklet_schedule(&raw->tasklet); 490 } 491 return; 492} 493 494/* 495 * Wait until length bytes are available int the output buffer. 496 * Has to be called with the s390irq lock held. Can be called 497 * disabled. 498 */ 499static void 500raw3215_make_room(struct raw3215_info *raw, unsigned int length) 501{ 502 while (RAW3215_BUFFER_SIZE - raw->count < length) { 503 /* there might be a request pending */ 504 raw->flags |= RAW3215_FLUSHING; 505 raw3215_mk_write_req(raw); 506 raw3215_try_io(raw); 507 raw->flags &= ~RAW3215_FLUSHING; 508#ifdef CONFIG_TN3215_CONSOLE 509 wait_cons_dev(); 510#endif 511 /* Enough room freed up ? */ 512 if (RAW3215_BUFFER_SIZE - raw->count >= length) 513 break; 514 /* there might be another cpu waiting for the lock */ 515 spin_unlock(get_ccwdev_lock(raw->cdev)); 516 udelay(100); 517 spin_lock(get_ccwdev_lock(raw->cdev)); 518 } 519} 520 521/* 522 * String write routine for 3215 devices 523 */ 524static void 525raw3215_write(struct raw3215_info *raw, const char *str, unsigned int length) 526{ 527 unsigned long flags; 528 int c, count; 529 530 while (length > 0) { 531 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 532 count = (length > RAW3215_BUFFER_SIZE) ? 533 RAW3215_BUFFER_SIZE : length; 534 length -= count; 535 536 raw3215_make_room(raw, count); 537 538 /* copy string to output buffer and convert it to EBCDIC */ 539 while (1) { 540 c = min_t(int, count, 541 min(RAW3215_BUFFER_SIZE - raw->count, 542 RAW3215_BUFFER_SIZE - raw->head)); 543 if (c <= 0) 544 break; 545 memcpy(raw->buffer + raw->head, str, c); 546 ASCEBC(raw->buffer + raw->head, c); 547 raw->head = (raw->head + c) & (RAW3215_BUFFER_SIZE - 1); 548 raw->count += c; 549 raw->line_pos += c; 550 str += c; 551 count -= c; 552 } 553 if (!(raw->flags & RAW3215_WORKING)) { 554 raw3215_mk_write_req(raw); 555 /* start or queue request */ 556 raw3215_try_io(raw); 557 } 558 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 559 } 560} 561 562/* 563 * Put character routine for 3215 devices 564 */ 565static void 566raw3215_putchar(struct raw3215_info *raw, unsigned char ch) 567{ 568 unsigned long flags; 569 unsigned int length, i; 570 571 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 572 if (ch == '\t') { 573 length = TAB_STOP_SIZE - (raw->line_pos%TAB_STOP_SIZE); 574 raw->line_pos += length; 575 ch = ' '; 576 } else if (ch == '\n') { 577 length = 1; 578 raw->line_pos = 0; 579 } else { 580 length = 1; 581 raw->line_pos++; 582 } 583 raw3215_make_room(raw, length); 584 585 for (i = 0; i < length; i++) { 586 raw->buffer[raw->head] = (char) _ascebc[(int) ch]; 587 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1); 588 raw->count++; 589 } 590 if (!(raw->flags & RAW3215_WORKING)) { 591 raw3215_mk_write_req(raw); 592 /* start or queue request */ 593 raw3215_try_io(raw); 594 } 595 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 596} 597 598/* 599 * Flush routine, it simply sets the flush flag and tries to start 600 * pending IO. 601 */ 602static void 603raw3215_flush_buffer(struct raw3215_info *raw) 604{ 605 unsigned long flags; 606 607 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 608 if (raw->count > 0) { 609 raw->flags |= RAW3215_FLUSHING; 610 raw3215_try_io(raw); 611 raw->flags &= ~RAW3215_FLUSHING; 612 } 613 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 614} 615 616/* 617 * Fire up a 3215 device. 618 */ 619static int 620raw3215_startup(struct raw3215_info *raw) 621{ 622 unsigned long flags; 623 624 if (raw->flags & RAW3215_ACTIVE) 625 return 0; 626 raw->line_pos = 0; 627 raw->flags |= RAW3215_ACTIVE; 628 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 629 raw3215_try_io(raw); 630 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 631 632 return 0; 633} 634 635/* 636 * Shutdown a 3215 device. 637 */ 638static void 639raw3215_shutdown(struct raw3215_info *raw) 640{ 641 DECLARE_WAITQUEUE(wait, current); 642 unsigned long flags; 643 644 if (!(raw->flags & RAW3215_ACTIVE) || (raw->flags & RAW3215_FIXED)) 645 return; 646 /* Wait for outstanding requests, then free irq */ 647 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 648 if ((raw->flags & RAW3215_WORKING) || 649 raw->queued_write != NULL || 650 raw->queued_read != NULL) { 651 raw->flags |= RAW3215_CLOSING; 652 add_wait_queue(&raw->empty_wait, &wait); 653 set_current_state(TASK_INTERRUPTIBLE); 654 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 655 schedule(); 656 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 657 remove_wait_queue(&raw->empty_wait, &wait); 658 set_current_state(TASK_RUNNING); 659 raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); 660 } 661 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 662} 663 664static int 665raw3215_probe (struct ccw_device *cdev) 666{ 667 struct raw3215_info *raw; 668 int line; 669 670 raw = kmalloc(sizeof(struct raw3215_info) + 671 RAW3215_INBUF_SIZE, GFP_KERNEL|GFP_DMA); 672 if (raw == NULL) 673 return -ENOMEM; 674 675 spin_lock(&raw3215_device_lock); 676 for (line = 0; line < NR_3215; line++) { 677 if (!raw3215[line]) { 678 raw3215[line] = raw; 679 break; 680 } 681 } 682 spin_unlock(&raw3215_device_lock); 683 if (line == NR_3215) { 684 kfree(raw); 685 return -ENODEV; 686 } 687 688 raw->cdev = cdev; 689 raw->inbuf = (char *) raw + sizeof(struct raw3215_info); 690 memset(raw, 0, sizeof(struct raw3215_info)); 691 raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, 692 GFP_KERNEL|GFP_DMA); 693 if (raw->buffer == NULL) { 694 spin_lock(&raw3215_device_lock); 695 raw3215[line] = NULL; 696 spin_unlock(&raw3215_device_lock); 697 kfree(raw); 698 return -ENOMEM; 699 } 700 tasklet_init(&raw->tasklet, 701 (void (*)(unsigned long)) raw3215_tasklet, 702 (unsigned long) raw); 703 init_waitqueue_head(&raw->empty_wait); 704 705 cdev->dev.driver_data = raw; 706 cdev->handler = raw3215_irq; 707 708 return 0; 709} 710 711static void 712raw3215_remove (struct ccw_device *cdev) 713{ 714 struct raw3215_info *raw; 715 716 ccw_device_set_offline(cdev); 717 raw = cdev->dev.driver_data; 718 if (raw) { 719 cdev->dev.driver_data = NULL; 720 kfree(raw->buffer); 721 kfree(raw); 722 } 723} 724 725static int 726raw3215_set_online (struct ccw_device *cdev) 727{ 728 struct raw3215_info *raw; 729 730 raw = cdev->dev.driver_data; 731 if (!raw) 732 return -ENODEV; 733 734 return raw3215_startup(raw); 735} 736 737static int 738raw3215_set_offline (struct ccw_device *cdev) 739{ 740 struct raw3215_info *raw; 741 742 raw = cdev->dev.driver_data; 743 if (!raw) 744 return -ENODEV; 745 746 raw3215_shutdown(raw); 747 748 return 0; 749} 750 751static struct ccw_device_id raw3215_id[] = { 752 { CCW_DEVICE(0x3215, 0) }, 753 { /* end of list */ }, 754}; 755 756static struct ccw_driver raw3215_ccw_driver = { 757 .name = "3215", 758 .owner = THIS_MODULE, 759 .ids = raw3215_id, 760 .probe = &raw3215_probe, 761 .remove = &raw3215_remove, 762 .set_online = &raw3215_set_online, 763 .set_offline = &raw3215_set_offline, 764}; 765 766#ifdef CONFIG_TN3215_CONSOLE 767/* 768 * Write a string to the 3215 console 769 */ 770static void 771con3215_write(struct console *co, const char *str, unsigned int count) 772{ 773 struct raw3215_info *raw; 774 int i; 775 776 if (count <= 0) 777 return; 778 raw = raw3215[0]; /* console 3215 is the first one */ 779 while (count > 0) { 780 for (i = 0; i < count; i++) 781 if (str[i] == '\t' || str[i] == '\n') 782 break; 783 raw3215_write(raw, str, i); 784 count -= i; 785 str += i; 786 if (count > 0) { 787 raw3215_putchar(raw, *str); 788 count--; 789 str++; 790 } 791 } 792} 793 794static struct tty_driver *con3215_device(struct console *c, int *index) 795{ 796 *index = c->index; 797 return tty3215_driver; 798} 799 800/* 801 * panic() calls console_unblank before the system enters a 802 * disabled, endless loop. 803 */ 804static void 805con3215_unblank(void) 806{ 807 struct raw3215_info *raw; 808 unsigned long flags; 809 810 raw = raw3215[0]; /* console 3215 is the first one */ 811 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 812 raw3215_make_room(raw, RAW3215_BUFFER_SIZE); 813 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 814} 815 816/* 817 * The console structure for the 3215 console 818 */ 819static struct console con3215 = { 820 .name = "ttyS", 821 .write = con3215_write, 822 .device = con3215_device, 823 .unblank = con3215_unblank, 824 .flags = CON_PRINTBUFFER, 825}; 826 827/* 828 * 3215 console initialization code called from console_init(). 829 * NOTE: This is called before kmalloc is available. 830 */ 831static int __init 832con3215_init(void) 833{ 834 struct ccw_device *cdev; 835 struct raw3215_info *raw; 836 struct raw3215_req *req; 837 int i; 838 839 /* Check if 3215 is to be the console */ 840 if (!CONSOLE_IS_3215) 841 return -ENODEV; 842 843 /* Set the console mode for VM */ 844 if (MACHINE_IS_VM) { 845 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 846 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); 847 } 848 849 /* allocate 3215 request structures */ 850 raw3215_freelist = NULL; 851 spin_lock_init(&raw3215_freelist_lock); 852 for (i = 0; i < NR_3215_REQ; i++) { 853 req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); 854 req->next = raw3215_freelist; 855 raw3215_freelist = req; 856 } 857 858 cdev = ccw_device_probe_console(); 859 if (IS_ERR(cdev)) 860 return -ENODEV; 861 862 raw3215[0] = raw = (struct raw3215_info *) 863 alloc_bootmem_low(sizeof(struct raw3215_info)); 864 memset(raw, 0, sizeof(struct raw3215_info)); 865 raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); 866 raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); 867 raw->cdev = cdev; 868 cdev->dev.driver_data = raw; 869 cdev->handler = raw3215_irq; 870 871 raw->flags |= RAW3215_FIXED; 872 tasklet_init(&raw->tasklet, 873 (void (*)(unsigned long)) raw3215_tasklet, 874 (unsigned long) raw); 875 init_waitqueue_head(&raw->empty_wait); 876 877 /* Request the console irq */ 878 if (raw3215_startup(raw) != 0) { 879 free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); 880 free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); 881 free_bootmem((unsigned long) raw, sizeof(struct raw3215_info)); 882 raw3215[0] = NULL; 883 printk("Couldn't find a 3215 console device\n"); 884 return -ENODEV; 885 } 886 register_console(&con3215); 887 return 0; 888} 889console_initcall(con3215_init); 890#endif 891 892/* 893 * tty3215_open 894 * 895 * This routine is called whenever a 3215 tty is opened. 896 */ 897static int 898tty3215_open(struct tty_struct *tty, struct file * filp) 899{ 900 struct raw3215_info *raw; 901 int retval, line; 902 903 line = tty->index; 904 if ((line < 0) || (line >= NR_3215)) 905 return -ENODEV; 906 907 raw = raw3215[line]; 908 if (raw == NULL) 909 return -ENODEV; 910 911 tty->driver_data = raw; 912 raw->tty = tty; 913 914 tty->low_latency = 0; /* don't use bottom half for pushing chars */ 915 /* 916 * Start up 3215 device 917 */ 918 retval = raw3215_startup(raw); 919 if (retval) 920 return retval; 921 922 return 0; 923} 924 925/* 926 * tty3215_close() 927 * 928 * This routine is called when the 3215 tty is closed. We wait 929 * for the remaining request to be completed. Then we clean up. 930 */ 931static void 932tty3215_close(struct tty_struct *tty, struct file * filp) 933{ 934 struct raw3215_info *raw; 935 936 raw = (struct raw3215_info *) tty->driver_data; 937 if (raw == NULL || tty->count > 1) 938 return; 939 tty->closing = 1; 940 /* Shutdown the terminal */ 941 raw3215_shutdown(raw); 942 tty->closing = 0; 943 raw->tty = NULL; 944} 945 946/* 947 * Returns the amount of free space in the output buffer. 948 */ 949static int 950tty3215_write_room(struct tty_struct *tty) 951{ 952 struct raw3215_info *raw; 953 954 raw = (struct raw3215_info *) tty->driver_data; 955 956 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ 957 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) 958 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; 959 else 960 return 0; 961} 962 963/* 964 * String write routine for 3215 ttys 965 */ 966static int 967tty3215_write(struct tty_struct * tty, 968 const unsigned char *buf, int count) 969{ 970 struct raw3215_info *raw; 971 972 if (!tty) 973 return 0; 974 raw = (struct raw3215_info *) tty->driver_data; 975 raw3215_write(raw, buf, count); 976 return count; 977} 978 979/* 980 * Put character routine for 3215 ttys 981 */ 982static void 983tty3215_put_char(struct tty_struct *tty, unsigned char ch) 984{ 985 struct raw3215_info *raw; 986 987 if (!tty) 988 return; 989 raw = (struct raw3215_info *) tty->driver_data; 990 raw3215_putchar(raw, ch); 991} 992 993static void 994tty3215_flush_chars(struct tty_struct *tty) 995{ 996} 997 998/* 999 * Returns the number of characters in the output buffer 1000 */ 1001static int 1002tty3215_chars_in_buffer(struct tty_struct *tty) 1003{ 1004 struct raw3215_info *raw; 1005 1006 raw = (struct raw3215_info *) tty->driver_data; 1007 return raw->count; 1008} 1009 1010static void 1011tty3215_flush_buffer(struct tty_struct *tty) 1012{ 1013 struct raw3215_info *raw; 1014 1015 raw = (struct raw3215_info *) tty->driver_data; 1016 raw3215_flush_buffer(raw); 1017 tty_wakeup(tty); 1018} 1019 1020/* 1021 * Currently we don't have any io controls for 3215 ttys 1022 */ 1023static int 1024tty3215_ioctl(struct tty_struct *tty, struct file * file, 1025 unsigned int cmd, unsigned long arg) 1026{ 1027 if (tty->flags & (1 << TTY_IO_ERROR)) 1028 return -EIO; 1029 1030 switch (cmd) { 1031 default: 1032 return -ENOIOCTLCMD; 1033 } 1034 return 0; 1035} 1036 1037/* 1038 * Disable reading from a 3215 tty 1039 */ 1040static void 1041tty3215_throttle(struct tty_struct * tty) 1042{ 1043 struct raw3215_info *raw; 1044 1045 raw = (struct raw3215_info *) tty->driver_data; 1046 raw->flags |= RAW3215_THROTTLED; 1047} 1048 1049/* 1050 * Enable reading from a 3215 tty 1051 */ 1052static void 1053tty3215_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 1071tty3215_stop(struct tty_struct *tty) 1072{ 1073 struct raw3215_info *raw; 1074 1075 raw = (struct raw3215_info *) tty->driver_data; 1076 raw->flags |= RAW3215_STOPPED; 1077} 1078 1079/* 1080 * Enable writing to a 3215 tty 1081 */ 1082static void 1083tty3215_start(struct tty_struct *tty) 1084{ 1085 struct raw3215_info *raw; 1086 unsigned long flags; 1087 1088 raw = (struct raw3215_info *) tty->driver_data; 1089 if (raw->flags & RAW3215_STOPPED) { 1090 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); 1091 raw->flags &= ~RAW3215_STOPPED; 1092 raw3215_try_io(raw); 1093 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); 1094 } 1095} 1096 1097static const struct tty_operations tty3215_ops = { 1098 .open = tty3215_open, 1099 .close = tty3215_close, 1100 .write = tty3215_write, 1101 .put_char = tty3215_put_char, 1102 .flush_chars = tty3215_flush_chars, 1103 .write_room = tty3215_write_room, 1104 .chars_in_buffer = tty3215_chars_in_buffer, 1105 .flush_buffer = tty3215_flush_buffer, 1106 .ioctl = tty3215_ioctl, 1107 .throttle = tty3215_throttle, 1108 .unthrottle = tty3215_unthrottle, 1109 .stop = tty3215_stop, 1110 .start = tty3215_start, 1111}; 1112 1113/* 1114 * 3215 tty registration code called from tty_init(). 1115 * Most kernel services (incl. kmalloc) are available at this poimt. 1116 */ 1117static int __init 1118tty3215_init(void) 1119{ 1120 struct tty_driver *driver; 1121 int ret; 1122 1123 if (!CONSOLE_IS_3215) 1124 return 0; 1125 1126 driver = alloc_tty_driver(NR_3215); 1127 if (!driver) 1128 return -ENOMEM; 1129 1130 ret = ccw_driver_register(&raw3215_ccw_driver); 1131 if (ret) { 1132 put_tty_driver(driver); 1133 return ret; 1134 } 1135 /* 1136 * Initialize the tty_driver structure 1137 * Entries in tty3215_driver that are NOT initialized: 1138 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc 1139 */ 1140 1141 driver->owner = THIS_MODULE; 1142 driver->driver_name = "tty3215"; 1143 driver->name = "ttyS"; 1144 driver->major = TTY_MAJOR; 1145 driver->minor_start = 64; 1146 driver->type = TTY_DRIVER_TYPE_SYSTEM; 1147 driver->subtype = SYSTEM_TYPE_TTY; 1148 driver->init_termios = tty_std_termios; 1149 driver->init_termios.c_iflag = IGNBRK | IGNPAR; 1150 driver->init_termios.c_oflag = ONLCR | XTABS; 1151 driver->init_termios.c_lflag = ISIG; 1152 driver->flags = TTY_DRIVER_REAL_RAW; 1153 tty_set_operations(driver, &tty3215_ops); 1154 ret = tty_register_driver(driver); 1155 if (ret) { 1156 printk("Couldn't register tty3215 driver\n"); 1157 put_tty_driver(driver); 1158 return ret; 1159 } 1160 tty3215_driver = driver; 1161 return 0; 1162} 1163 1164static void __exit 1165tty3215_exit(void) 1166{ 1167 tty_unregister_driver(tty3215_driver); 1168 put_tty_driver(tty3215_driver); 1169 ccw_driver_unregister(&raw3215_ccw_driver); 1170} 1171 1172module_init(tty3215_init); 1173module_exit(tty3215_exit); 1174