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1// SPDX-License-Identifier: GPL-2.02/*3 * 3215 line mode terminal driver.4 *5 * Copyright IBM Corp. 1999, 20096 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>7 *8 * Updated:9 * Aug-2000: Added tab support10 * Dan Morrison, IBM Corporation <dmorriso@cse.buffalo.edu>11 */12 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/panic_notifier.h>23#include <linux/reboot.h>24#include <linux/serial.h> /* ASYNC_* flags */25#include <linux/slab.h>26#include <asm/ccwdev.h>27#include <asm/cio.h>28#include <linux/io.h>29#include <asm/ebcdic.h>30#include <linux/uaccess.h>31#include <asm/delay.h>32#include <asm/cpcmd.h>33#include <asm/setup.h>34 35#include "ctrlchar.h"36 37#define NR_3215 138#define NR_3215_REQ (4*NR_3215)39#define RAW3215_BUFFER_SIZE 65536 /* output buffer size */40#define RAW3215_INBUF_SIZE 256 /* input buffer size */41#define RAW3215_MIN_SPACE 128 /* minimum free space for wakeup */42#define RAW3215_MIN_WRITE 1024 /* min. length for immediate output */43#define RAW3215_MAX_BYTES 3968 /* max. bytes to write with one ssch */44#define RAW3215_MAX_NEWLINE 50 /* max. lines to write with one ssch */45#define RAW3215_NR_CCWS 346#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */47 48#define RAW3215_FIXED 1 /* 3215 console device is not be freed */49#define RAW3215_WORKING 4 /* set if a request is being worked on */50#define RAW3215_THROTTLED 8 /* set if reading is disabled */51#define RAW3215_STOPPED 16 /* set if writing is disabled */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 55#define TAB_STOP_SIZE 8 /* tab stop size */56 57/*58 * Request types for a 3215 device59 */60enum raw3215_type {61 RAW3215_FREE, RAW3215_READ, RAW3215_WRITE62};63 64/*65 * Request structure for a 3215 device66 */67struct raw3215_req {68 enum raw3215_type type; /* type of the request */69 int start, len; /* start index & len in output buffer */70 int delayable; /* indication to wait for more data */71 int residual; /* residual count for read request */72 struct ccw1 ccws[RAW3215_NR_CCWS]; /* space for the channel program */73 struct raw3215_info *info; /* pointer to main structure */74 struct raw3215_req *next; /* pointer to next request */75} __attribute__ ((aligned(8)));76 77struct raw3215_info {78 struct tty_port port;79 struct ccw_device *cdev; /* device for tty driver */80 spinlock_t *lock; /* pointer to irq lock */81 int flags; /* state flags */82 u8 *buffer; /* pointer to output buffer */83 u8 *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 raw3215_req *queued_read; /* pointer to queued read requests */88 struct raw3215_req *queued_write;/* pointer to queued write requests */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};93 94/* array of 3215 devices structures */95static struct raw3215_info *raw3215[NR_3215];96/* spinlock to protect the raw3215 array */97static DEFINE_SPINLOCK(raw3215_device_lock);98/* list of free request structures */99static struct raw3215_req *raw3215_freelist;100/* spinlock to protect free list */101static DEFINE_SPINLOCK(raw3215_freelist_lock);102 103static struct tty_driver *tty3215_driver;104static bool con3215_drop = true;105 106/*107 * Get a request structure from the free list108 */109static 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 list123 */124static 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 happen140 * because a 3215 terminal won't accept a new read before the old one is141 * completed.142 */143static 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 = virt_to_dma32(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 output168 * buffer to the 3215 device. If a queued write exists it is replaced by169 * the new, probably lengthened request.170 */171static 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 accept196 * RAW3215_MAX_NEWLINE newlines in a single ssch due to197 * a restriction in VM198 */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 = virt_to_dma32(raw->buffer + ix);222 count = len;223 if (ix + count > RAW3215_BUFFER_SIZE)224 count = RAW3215_BUFFER_SIZE - ix;225 ccw->count = count;226 len -= count;227 ix = (ix + count) & (RAW3215_BUFFER_SIZE - 1);228 ccw++;229 }230 /*231 * Add a NOP to the channel program. 3215 devices are purely232 * emulated and its much better to avoid the channel end233 * interrupt in this case.234 */235 if (ccw > req->ccws)236 ccw[-1].flags |= 0x40; /* use command chaining */237 ccw->cmd_code = 0x03; /* NOP */238 ccw->flags = 0;239 ccw->cda = 0;240 ccw->count = 1;241}242 243/*244 * Start a read or a write request245 */246static void raw3215_start_io(struct raw3215_info *raw)247{248 struct raw3215_req *req;249 int res;250 251 req = raw->queued_read;252 if (req != NULL &&253 !(raw->flags & (RAW3215_WORKING | RAW3215_THROTTLED))) {254 /* dequeue request */255 raw->queued_read = NULL;256 res = ccw_device_start(raw->cdev, req->ccws,257 (unsigned long) req, 0, 0);258 if (res != 0) {259 /* do_IO failed, put request back to queue */260 raw->queued_read = req;261 } else {262 raw->flags |= RAW3215_WORKING;263 }264 }265 req = raw->queued_write;266 if (req != NULL &&267 !(raw->flags & (RAW3215_WORKING | RAW3215_STOPPED))) {268 /* dequeue request */269 raw->queued_write = NULL;270 res = ccw_device_start(raw->cdev, req->ccws,271 (unsigned long) req, 0, 0);272 if (res != 0) {273 /* do_IO failed, put request back to queue */274 raw->queued_write = req;275 } else {276 raw->flags |= RAW3215_WORKING;277 }278 }279}280 281/*282 * Function to start a delayed output after RAW3215_TIMEOUT seconds283 */284static void raw3215_timeout(struct timer_list *t)285{286 struct raw3215_info *raw = from_timer(raw, t, timer);287 unsigned long flags;288 289 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);290 raw->flags &= ~RAW3215_TIMER_RUNS;291 raw3215_mk_write_req(raw);292 raw3215_start_io(raw);293 if ((raw->queued_read || raw->queued_write) &&294 !(raw->flags & RAW3215_WORKING) &&295 !(raw->flags & RAW3215_TIMER_RUNS)) {296 raw->timer.expires = RAW3215_TIMEOUT + jiffies;297 add_timer(&raw->timer);298 raw->flags |= RAW3215_TIMER_RUNS;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 the306 * amount of data is bigger than RAW3215_MIN_WRITE. If a write is not307 * 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 (!tty_port_initialized(&raw->port))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 }321 }322 if ((raw->queued_read || raw->queued_write) &&323 !(raw->flags & RAW3215_WORKING) &&324 !(raw->flags & RAW3215_TIMER_RUNS)) {325 raw->timer.expires = RAW3215_TIMEOUT + jiffies;326 add_timer(&raw->timer);327 raw->flags |= RAW3215_TIMER_RUNS;328 }329}330 331/*332 * Try to start the next IO and wake up processes waiting on the tty.333 */334static void raw3215_next_io(struct raw3215_info *raw, struct tty_struct *tty)335{336 raw3215_mk_write_req(raw);337 raw3215_try_io(raw);338 if (tty && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE)339 tty_wakeup(tty);340}341 342/*343 * Interrupt routine, called from common io layer344 */345static void raw3215_irq(struct ccw_device *cdev, unsigned long intparm,346 struct irb *irb)347{348 struct raw3215_info *raw;349 struct raw3215_req *req;350 struct tty_struct *tty;351 int cstat, dstat;352 int count;353 354 raw = dev_get_drvdata(&cdev->dev);355 req = (struct raw3215_req *) intparm;356 tty = tty_port_tty_get(&raw->port);357 cstat = irb->scsw.cmd.cstat;358 dstat = irb->scsw.cmd.dstat;359 if (cstat != 0)360 raw3215_next_io(raw, tty);361 if (dstat & 0x01) { /* we got a unit exception */362 dstat &= ~0x01; /* we can ignore it */363 }364 switch (dstat) {365 case 0x80:366 if (cstat != 0)367 break;368 /* Attention interrupt, someone hit the enter key */369 raw3215_mk_read_req(raw);370 raw3215_next_io(raw, tty);371 break;372 case 0x08:373 case 0x0C:374 /* Channel end interrupt. */375 if ((raw = req->info) == NULL)376 goto put_tty; /* That shouldn't happen ... */377 if (req->type == RAW3215_READ) {378 /* store residual count, then wait for device end */379 req->residual = irb->scsw.cmd.count;380 }381 if (dstat == 0x08)382 break;383 fallthrough;384 case 0x04:385 /* Device end interrupt. */386 if ((raw = req->info) == NULL)387 goto put_tty; /* That shouldn't happen ... */388 if (req->type == RAW3215_READ && tty != NULL) {389 unsigned int cchar;390 391 count = 160 - req->residual;392 EBCASC(raw->inbuf, count);393 cchar = ctrlchar_handle(raw->inbuf, count, tty);394 switch (cchar & CTRLCHAR_MASK) {395 case CTRLCHAR_SYSRQ:396 break;397 398 case CTRLCHAR_CTRL:399 tty_insert_flip_char(&raw->port, cchar,400 TTY_NORMAL);401 tty_flip_buffer_push(&raw->port);402 break;403 404 case CTRLCHAR_NONE:405 if (count < 2 ||406 (strncmp(raw->inbuf+count-2, "\252n", 2) &&407 strncmp(raw->inbuf+count-2, "^n", 2)) ) {408 /* add the auto \n */409 raw->inbuf[count] = '\n';410 count++;411 } else412 count -= 2;413 tty_insert_flip_string(&raw->port, raw->inbuf,414 count);415 tty_flip_buffer_push(&raw->port);416 break;417 }418 } else if (req->type == RAW3215_WRITE) {419 raw->count -= req->len;420 raw->written -= req->len;421 }422 raw->flags &= ~RAW3215_WORKING;423 raw3215_free_req(req);424 /* check for empty wait */425 if (waitqueue_active(&raw->empty_wait) &&426 raw->queued_write == NULL &&427 raw->queued_read == NULL) {428 wake_up_interruptible(&raw->empty_wait);429 }430 raw3215_next_io(raw, tty);431 break;432 default:433 /* Strange interrupt, I'll do my best to clean up */434 if (req != NULL && req->type != RAW3215_FREE) {435 if (req->type == RAW3215_WRITE) {436 raw->count -= req->len;437 raw->written -= req->len;438 }439 raw->flags &= ~RAW3215_WORKING;440 raw3215_free_req(req);441 }442 raw3215_next_io(raw, tty);443 }444put_tty:445 tty_kref_put(tty);446}447 448/*449 * Need to drop data to avoid blocking. Drop as much data as possible.450 * This is unqueued part in the buffer and the queued part in the request.451 * Also adjust the head position to append new data and set count452 * accordingly.453 *454 * Return number of bytes available in buffer.455 */456static unsigned int raw3215_drop(struct raw3215_info *raw)457{458 struct raw3215_req *req;459 460 req = raw->queued_write;461 if (req) {462 /* Drop queued data and delete request */463 raw->written -= req->len;464 raw3215_free_req(req);465 raw->queued_write = NULL;466 }467 raw->head = (raw->head - raw->count + raw->written) &468 (RAW3215_BUFFER_SIZE - 1);469 raw->count = raw->written;470 471 return RAW3215_BUFFER_SIZE - raw->count;472}473 474/*475 * Wait until length bytes are available int the output buffer.476 * If drop mode is active and wait condition holds true, start dropping477 * data.478 * Has to be called with the s390irq lock held. Can be called479 * disabled.480 */481static unsigned int raw3215_make_room(struct raw3215_info *raw,482 unsigned int length, bool drop)483{484 while (RAW3215_BUFFER_SIZE - raw->count < length) {485 if (drop)486 return raw3215_drop(raw);487 488 /* there might be a request pending */489 raw->flags |= RAW3215_FLUSHING;490 raw3215_mk_write_req(raw);491 raw3215_try_io(raw);492 raw->flags &= ~RAW3215_FLUSHING;493#ifdef CONFIG_TN3215_CONSOLE494 ccw_device_wait_idle(raw->cdev);495#endif496 /* Enough room freed up ? */497 if (RAW3215_BUFFER_SIZE - raw->count >= length)498 break;499 /* there might be another cpu waiting for the lock */500 spin_unlock(get_ccwdev_lock(raw->cdev));501 udelay(100);502 spin_lock(get_ccwdev_lock(raw->cdev));503 }504 return length;505}506 507#define RAW3215_COUNT 1508#define RAW3215_STORE 2509 510/*511 * Add text to console buffer. Find tabs in input and calculate size512 * including tab replacement.513 * This function operates in 2 different modes, depending on parameter514 * opmode:515 * RAW3215_COUNT: Get the size needed for the input string with516 * proper tab replacement calculation.517 * Return value is the number of bytes required to store the518 * input. However no data is actually stored.519 * The parameter todrop is not used.520 * RAW3215_STORE: Add data to the console buffer. The parameter todrop is521 * valid and contains the number of bytes to be dropped from head of522 * string without blocking.523 * Return value is the number of bytes copied.524 */525static unsigned int raw3215_addtext(const u8 *str, size_t length,526 struct raw3215_info *raw, int opmode,527 unsigned int todrop)528{529 unsigned int i, blanks, expanded_size = 0;530 unsigned int column = raw->line_pos;531 size_t c;532 u8 ch;533 534 if (opmode == RAW3215_COUNT)535 todrop = 0;536 537 for (c = 0; c < length; ++c) {538 blanks = 1;539 ch = str[c];540 541 switch (ch) {542 case '\n':543 expanded_size++;544 column = 0;545 break;546 case '\t':547 blanks = TAB_STOP_SIZE - (column % TAB_STOP_SIZE);548 column += blanks;549 expanded_size += blanks;550 ch = ' ';551 break;552 default:553 expanded_size++;554 column++;555 break;556 }557 558 if (opmode == RAW3215_COUNT)559 continue;560 if (todrop && expanded_size < todrop) /* Drop head data */561 continue;562 for (i = 0; i < blanks; i++) {563 raw->buffer[raw->head] = _ascebc[ch];564 raw->head = (raw->head + 1) & (RAW3215_BUFFER_SIZE - 1);565 raw->count++;566 }567 raw->line_pos = column;568 }569 return expanded_size - todrop;570}571 572/*573 * String write routine for 3215 devices574 */575static void raw3215_write(struct raw3215_info *raw, const u8 *str,576 size_t length)577{578 unsigned int count, avail;579 unsigned long flags;580 581 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);582 583 count = raw3215_addtext(str, length, raw, RAW3215_COUNT, 0);584 585 avail = raw3215_make_room(raw, count, con3215_drop);586 if (avail) {587 raw3215_addtext(str, length, raw, RAW3215_STORE,588 count - avail);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 * Put character routine for 3215 devices600 */601static void raw3215_putchar(struct raw3215_info *raw, u8 ch)602{603 raw3215_write(raw, &ch, 1);604}605 606/*607 * Flush routine, it simply sets the flush flag and tries to start608 * pending IO.609 */610static void raw3215_flush_buffer(struct raw3215_info *raw)611{612 unsigned long flags;613 614 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);615 if (raw->count > 0) {616 raw->flags |= RAW3215_FLUSHING;617 raw3215_try_io(raw);618 raw->flags &= ~RAW3215_FLUSHING;619 }620 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);621}622 623/*624 * Fire up a 3215 device.625 */626static int raw3215_startup(struct raw3215_info *raw)627{628 unsigned long flags;629 630 if (tty_port_initialized(&raw->port))631 return 0;632 raw->line_pos = 0;633 tty_port_set_initialized(&raw->port, true);634 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);635 raw3215_try_io(raw);636 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);637 638 return 0;639}640 641/*642 * Shutdown a 3215 device.643 */644static void raw3215_shutdown(struct raw3215_info *raw)645{646 DECLARE_WAITQUEUE(wait, current);647 unsigned long flags;648 649 if (!tty_port_initialized(&raw->port) || (raw->flags & RAW3215_FIXED))650 return;651 /* Wait for outstanding requests, then free irq */652 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);653 if ((raw->flags & RAW3215_WORKING) ||654 raw->queued_write != NULL ||655 raw->queued_read != NULL) {656 add_wait_queue(&raw->empty_wait, &wait);657 set_current_state(TASK_INTERRUPTIBLE);658 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);659 schedule();660 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);661 remove_wait_queue(&raw->empty_wait, &wait);662 set_current_state(TASK_RUNNING);663 tty_port_set_initialized(&raw->port, true);664 }665 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);666}667 668static struct raw3215_info *raw3215_alloc_info(void)669{670 struct raw3215_info *info;671 672 info = kzalloc(sizeof(struct raw3215_info), GFP_KERNEL | GFP_DMA);673 if (!info)674 return NULL;675 676 info->buffer = kzalloc(RAW3215_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);677 info->inbuf = kzalloc(RAW3215_INBUF_SIZE, GFP_KERNEL | GFP_DMA);678 if (!info->buffer || !info->inbuf) {679 kfree(info->inbuf);680 kfree(info->buffer);681 kfree(info);682 return NULL;683 }684 685 timer_setup(&info->timer, raw3215_timeout, 0);686 init_waitqueue_head(&info->empty_wait);687 tty_port_init(&info->port);688 689 return info;690}691 692static void raw3215_free_info(struct raw3215_info *raw)693{694 kfree(raw->inbuf);695 kfree(raw->buffer);696 tty_port_destroy(&raw->port);697 kfree(raw);698}699 700static int raw3215_probe(struct ccw_device *cdev)701{702 struct raw3215_info *raw;703 int line;704 705 /* Console is special. */706 if (raw3215[0] && (raw3215[0] == dev_get_drvdata(&cdev->dev)))707 return 0;708 709 raw = raw3215_alloc_info();710 if (raw == NULL)711 return -ENOMEM;712 713 raw->cdev = cdev;714 dev_set_drvdata(&cdev->dev, raw);715 cdev->handler = raw3215_irq;716 717 spin_lock(&raw3215_device_lock);718 for (line = 0; line < NR_3215; line++) {719 if (!raw3215[line]) {720 raw3215[line] = raw;721 break;722 }723 }724 spin_unlock(&raw3215_device_lock);725 if (line == NR_3215) {726 raw3215_free_info(raw);727 return -ENODEV;728 }729 730 return 0;731}732 733static void raw3215_remove(struct ccw_device *cdev)734{735 struct raw3215_info *raw;736 unsigned int line;737 738 ccw_device_set_offline(cdev);739 raw = dev_get_drvdata(&cdev->dev);740 if (raw) {741 spin_lock(&raw3215_device_lock);742 for (line = 0; line < NR_3215; line++)743 if (raw3215[line] == raw)744 break;745 raw3215[line] = NULL;746 spin_unlock(&raw3215_device_lock);747 dev_set_drvdata(&cdev->dev, NULL);748 raw3215_free_info(raw);749 }750}751 752static int raw3215_set_online(struct ccw_device *cdev)753{754 struct raw3215_info *raw;755 756 raw = dev_get_drvdata(&cdev->dev);757 if (!raw)758 return -ENODEV;759 760 return raw3215_startup(raw);761}762 763static int raw3215_set_offline(struct ccw_device *cdev)764{765 struct raw3215_info *raw;766 767 raw = dev_get_drvdata(&cdev->dev);768 if (!raw)769 return -ENODEV;770 771 raw3215_shutdown(raw);772 773 return 0;774}775 776static struct ccw_device_id raw3215_id[] = {777 { CCW_DEVICE(0x3215, 0) },778 { /* end of list */ },779};780 781static ssize_t con_drop_store(struct device_driver *dev, const char *buf, size_t count)782{783 bool drop;784 int rc;785 786 rc = kstrtobool(buf, &drop);787 if (!rc)788 con3215_drop = drop;789 return rc ?: count;790}791 792static ssize_t con_drop_show(struct device_driver *dev, char *buf)793{794 return sysfs_emit(buf, "%d\n", con3215_drop ? 1 : 0);795}796 797static DRIVER_ATTR_RW(con_drop);798 799static struct attribute *con3215_drv_attrs[] = {800 &driver_attr_con_drop.attr,801 NULL,802};803 804static struct attribute_group con3215_drv_attr_group = {805 .attrs = con3215_drv_attrs,806 NULL,807};808 809static const struct attribute_group *con3215_drv_attr_groups[] = {810 &con3215_drv_attr_group,811 NULL,812};813 814static struct ccw_driver raw3215_ccw_driver = {815 .driver = {816 .name = "3215",817 .groups = con3215_drv_attr_groups,818 .owner = THIS_MODULE,819 },820 .ids = raw3215_id,821 .probe = &raw3215_probe,822 .remove = &raw3215_remove,823 .set_online = &raw3215_set_online,824 .set_offline = &raw3215_set_offline,825 .int_class = IRQIO_C15,826};827 828static void handle_write(struct raw3215_info *raw, const u8 *str, size_t count)829{830 while (count > 0) {831 size_t i = min_t(size_t, count, RAW3215_BUFFER_SIZE - 1);832 raw3215_write(raw, str, i);833 count -= i;834 str += i;835 }836}837 838#ifdef CONFIG_TN3215_CONSOLE839/*840 * Write a string to the 3215 console841 */842static void con3215_write(struct console *co, const char *str, unsigned int count)843{844 handle_write(raw3215[0], str, count);845}846 847static struct tty_driver *con3215_device(struct console *c, int *index)848{849 *index = c->index;850 return tty3215_driver;851}852 853/*854 * The below function is called as a panic/reboot notifier before the855 * system enters a disabled, endless loop.856 *857 * Notice we must use the spin_trylock() alternative, to prevent lockups858 * in atomic context (panic routine runs with secondary CPUs, local IRQs859 * and preemption disabled).860 */861static int con3215_notify(struct notifier_block *self,862 unsigned long event, void *data)863{864 struct raw3215_info *raw;865 unsigned long flags;866 867 raw = raw3215[0]; /* console 3215 is the first one */868 if (!spin_trylock_irqsave(get_ccwdev_lock(raw->cdev), flags))869 return NOTIFY_DONE;870 raw3215_make_room(raw, RAW3215_BUFFER_SIZE, false);871 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);872 873 return NOTIFY_DONE;874}875 876static struct notifier_block on_panic_nb = {877 .notifier_call = con3215_notify,878 .priority = INT_MIN + 1, /* run the callback late */879};880 881static struct notifier_block on_reboot_nb = {882 .notifier_call = con3215_notify,883 .priority = INT_MIN + 1, /* run the callback late */884};885 886/*887 * The console structure for the 3215 console888 */889static struct console con3215 = {890 .name = "ttyS",891 .write = con3215_write,892 .device = con3215_device,893 .flags = CON_PRINTBUFFER,894};895 896/*897 * 3215 console initialization code called from console_init().898 */899static int __init con3215_init(void)900{901 struct ccw_device *cdev;902 struct raw3215_info *raw;903 struct raw3215_req *req;904 int i;905 906 /* Check if 3215 is to be the console */907 if (!CONSOLE_IS_3215)908 return -ENODEV;909 910 /* Set the console mode for VM */911 if (MACHINE_IS_VM) {912 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);913 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);914 }915 916 /* allocate 3215 request structures */917 raw3215_freelist = NULL;918 for (i = 0; i < NR_3215_REQ; i++) {919 req = kzalloc(sizeof(struct raw3215_req), GFP_KERNEL | GFP_DMA);920 if (!req)921 return -ENOMEM;922 req->next = raw3215_freelist;923 raw3215_freelist = req;924 }925 926 cdev = ccw_device_create_console(&raw3215_ccw_driver);927 if (IS_ERR(cdev))928 return -ENODEV;929 930 raw3215[0] = raw = raw3215_alloc_info();931 raw->cdev = cdev;932 dev_set_drvdata(&cdev->dev, raw);933 cdev->handler = raw3215_irq;934 935 raw->flags |= RAW3215_FIXED;936 if (ccw_device_enable_console(cdev)) {937 ccw_device_destroy_console(cdev);938 raw3215_free_info(raw);939 raw3215[0] = NULL;940 return -ENODEV;941 }942 943 /* Request the console irq */944 if (raw3215_startup(raw) != 0) {945 raw3215_free_info(raw);946 raw3215[0] = NULL;947 return -ENODEV;948 }949 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);950 register_reboot_notifier(&on_reboot_nb);951 register_console(&con3215);952 return 0;953}954console_initcall(con3215_init);955#endif956 957static int tty3215_install(struct tty_driver *driver, struct tty_struct *tty)958{959 struct raw3215_info *raw;960 961 raw = raw3215[tty->index];962 if (raw == NULL)963 return -ENODEV;964 965 tty->driver_data = raw;966 967 return tty_port_install(&raw->port, driver, tty);968}969 970/*971 * tty3215_open972 *973 * This routine is called whenever a 3215 tty is opened.974 */975static int tty3215_open(struct tty_struct *tty, struct file * filp)976{977 struct raw3215_info *raw = tty->driver_data;978 979 tty_port_tty_set(&raw->port, tty);980 981 /*982 * Start up 3215 device983 */984 return raw3215_startup(raw);985}986 987/*988 * tty3215_close()989 *990 * This routine is called when the 3215 tty is closed. We wait991 * for the remaining request to be completed. Then we clean up.992 */993static void tty3215_close(struct tty_struct *tty, struct file * filp)994{995 struct raw3215_info *raw = tty->driver_data;996 997 if (raw == NULL || tty->count > 1)998 return;999 tty->closing = 1;1000 /* Shutdown the terminal */1001 raw3215_shutdown(raw);1002 tty->closing = 0;1003 tty_port_tty_set(&raw->port, NULL);1004}1005 1006/*1007 * Returns the amount of free space in the output buffer.1008 */1009static unsigned int tty3215_write_room(struct tty_struct *tty)1010{1011 struct raw3215_info *raw = tty->driver_data;1012 1013 /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */1014 if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0)1015 return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE;1016 else1017 return 0;1018}1019 1020/*1021 * String write routine for 3215 ttys1022 */1023static ssize_t tty3215_write(struct tty_struct *tty, const u8 *buf,1024 size_t count)1025{1026 handle_write(tty->driver_data, buf, count);1027 return count;1028}1029 1030/*1031 * Put character routine for 3215 ttys1032 */1033static int tty3215_put_char(struct tty_struct *tty, u8 ch)1034{1035 struct raw3215_info *raw = tty->driver_data;1036 1037 raw3215_putchar(raw, ch);1038 1039 return 1;1040}1041 1042static void tty3215_flush_chars(struct tty_struct *tty)1043{1044}1045 1046/*1047 * Returns the number of characters in the output buffer1048 */1049static unsigned int tty3215_chars_in_buffer(struct tty_struct *tty)1050{1051 struct raw3215_info *raw = tty->driver_data;1052 1053 return raw->count;1054}1055 1056static void tty3215_flush_buffer(struct tty_struct *tty)1057{1058 struct raw3215_info *raw = tty->driver_data;1059 1060 raw3215_flush_buffer(raw);1061 tty_wakeup(tty);1062}1063 1064/*1065 * Disable reading from a 3215 tty1066 */1067static void tty3215_throttle(struct tty_struct *tty)1068{1069 struct raw3215_info *raw = tty->driver_data;1070 1071 raw->flags |= RAW3215_THROTTLED;1072}1073 1074/*1075 * Enable reading from a 3215 tty1076 */1077static void tty3215_unthrottle(struct tty_struct *tty)1078{1079 struct raw3215_info *raw = tty->driver_data;1080 unsigned long flags;1081 1082 if (raw->flags & RAW3215_THROTTLED) {1083 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);1084 raw->flags &= ~RAW3215_THROTTLED;1085 raw3215_try_io(raw);1086 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);1087 }1088}1089 1090/*1091 * Disable writing to a 3215 tty1092 */1093static void tty3215_stop(struct tty_struct *tty)1094{1095 struct raw3215_info *raw = tty->driver_data;1096 1097 raw->flags |= RAW3215_STOPPED;1098}1099 1100/*1101 * Enable writing to a 3215 tty1102 */1103static void tty3215_start(struct tty_struct *tty)1104{1105 struct raw3215_info *raw = tty->driver_data;1106 unsigned long flags;1107 1108 if (raw->flags & RAW3215_STOPPED) {1109 spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);1110 raw->flags &= ~RAW3215_STOPPED;1111 raw3215_try_io(raw);1112 spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);1113 }1114}1115 1116static const struct tty_operations tty3215_ops = {1117 .install = tty3215_install,1118 .open = tty3215_open,1119 .close = tty3215_close,1120 .write = tty3215_write,1121 .put_char = tty3215_put_char,1122 .flush_chars = tty3215_flush_chars,1123 .write_room = tty3215_write_room,1124 .chars_in_buffer = tty3215_chars_in_buffer,1125 .flush_buffer = tty3215_flush_buffer,1126 .throttle = tty3215_throttle,1127 .unthrottle = tty3215_unthrottle,1128 .stop = tty3215_stop,1129 .start = tty3215_start,1130};1131 1132static int __init con3215_setup_drop(char *str)1133{1134 bool drop;1135 int rc;1136 1137 rc = kstrtobool(str, &drop);1138 if (!rc)1139 con3215_drop = drop;1140 return rc;1141}1142early_param("con3215_drop", con3215_setup_drop);1143 1144/*1145 * 3215 tty registration code called from tty_init().1146 * Most kernel services (incl. kmalloc) are available at this poimt.1147 */1148static int __init tty3215_init(void)1149{1150 struct tty_driver *driver;1151 int ret;1152 1153 if (!CONSOLE_IS_3215)1154 return 0;1155 1156 driver = tty_alloc_driver(NR_3215, TTY_DRIVER_REAL_RAW);1157 if (IS_ERR(driver))1158 return PTR_ERR(driver);1159 1160 ret = ccw_driver_register(&raw3215_ccw_driver);1161 if (ret) {1162 tty_driver_kref_put(driver);1163 return ret;1164 }1165 /*1166 * Initialize the tty_driver structure1167 * Entries in tty3215_driver that are NOT initialized:1168 * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc1169 */1170 1171 driver->driver_name = "tty3215";1172 driver->name = "ttyS";1173 driver->major = TTY_MAJOR;1174 driver->minor_start = 64;1175 driver->type = TTY_DRIVER_TYPE_SYSTEM;1176 driver->subtype = SYSTEM_TYPE_TTY;1177 driver->init_termios = tty_std_termios;1178 driver->init_termios.c_iflag = IGNBRK | IGNPAR;1179 driver->init_termios.c_oflag = ONLCR;1180 driver->init_termios.c_lflag = ISIG;1181 tty_set_operations(driver, &tty3215_ops);1182 ret = tty_register_driver(driver);1183 if (ret) {1184 tty_driver_kref_put(driver);1185 return ret;1186 }1187 tty3215_driver = driver;1188 return 0;1189}1190device_initcall(tty3215_init);1191