Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/kdev_t.h> |
| 17 | #include <linux/tty.h> |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 18 | #include <linux/tty_flip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/vt_kern.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/console.h> |
| 22 | #include <linux/interrupt.h> |
Peter Oberparleiter | 600b5d1 | 2006-02-01 03:06:35 -0800 | [diff] [blame] | 23 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 64 | enum raw3215_type { |
| 65 | RAW3215_FREE, RAW3215_READ, RAW3215_WRITE |
| 66 | }; |
| 67 | |
| 68 | /* |
| 69 | * Request structure for a 3215 device |
| 70 | */ |
| 71 | struct 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 | |
| 81 | struct 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 */ |
| 104 | static struct raw3215_info *raw3215[NR_3215]; |
| 105 | /* spinlock to protect the raw3215 array */ |
| 106 | static DEFINE_SPINLOCK(raw3215_device_lock); |
| 107 | /* list of free request structures */ |
| 108 | static struct raw3215_req *raw3215_freelist; |
| 109 | /* spinlock to protect free list */ |
| 110 | static spinlock_t raw3215_freelist_lock; |
| 111 | |
| 112 | static struct tty_driver *tty3215_driver; |
| 113 | |
| 114 | /* |
| 115 | * Get a request structure from the free list |
| 116 | */ |
| 117 | static inline struct raw3215_req * |
| 118 | raw3215_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 | */ |
| 132 | static inline void |
| 133 | raw3215_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 | */ |
| 151 | static void |
| 152 | raw3215_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 | */ |
| 180 | static void |
| 181 | raw3215_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 | */ |
| 257 | static void |
| 258 | raw3215_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 | */ |
| 296 | static void |
| 297 | raw3215_timeout(unsigned long __data) |
| 298 | { |
| 299 | struct raw3215_info *raw = (struct raw3215_info *) __data; |
| 300 | unsigned long flags; |
| 301 | |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 302 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 309 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 318 | static inline void |
| 319 | raw3215_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 | */ |
| 350 | static void |
| 351 | raw3215_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; |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 358 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | raw3215_mk_write_req(raw); |
| 360 | raw3215_try_io(raw); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 361 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 377 | static void |
| 378 | raw3215_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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 443 | tty_insert_flip_char(tty, cchar, TTY_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | tty_flip_buffer_push(raw->tty); |
| 445 | break; |
| 446 | |
| 447 | case CTRLCHAR_NONE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | if (count < 2 || |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 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'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | count++; |
| 454 | } else |
Alan Cox | 33f0f88 | 2006-01-09 20:54:13 -0800 | [diff] [blame] | 455 | count -= 2; |
| 456 | tty_insert_flip_string(tty, raw->inbuf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 499 | static void |
| 500 | raw3215_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 */ |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 515 | spin_unlock(get_ccwdev_lock(raw->cdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | udelay(100); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 517 | spin_lock(get_ccwdev_lock(raw->cdev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | } |
| 520 | |
| 521 | /* |
| 522 | * String write routine for 3215 devices |
| 523 | */ |
| 524 | static void |
| 525 | raw3215_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) { |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 531 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 558 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | } |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * Put character routine for 3215 devices |
| 564 | */ |
| 565 | static void |
| 566 | raw3215_putchar(struct raw3215_info *raw, unsigned char ch) |
| 567 | { |
| 568 | unsigned long flags; |
| 569 | unsigned int length, i; |
| 570 | |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 571 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 595 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | /* |
| 599 | * Flush routine, it simply sets the flush flag and tries to start |
| 600 | * pending IO. |
| 601 | */ |
| 602 | static void |
| 603 | raw3215_flush_buffer(struct raw3215_info *raw) |
| 604 | { |
| 605 | unsigned long flags; |
| 606 | |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 607 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | if (raw->count > 0) { |
| 609 | raw->flags |= RAW3215_FLUSHING; |
| 610 | raw3215_try_io(raw); |
| 611 | raw->flags &= ~RAW3215_FLUSHING; |
| 612 | } |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 613 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | } |
| 615 | |
| 616 | /* |
| 617 | * Fire up a 3215 device. |
| 618 | */ |
| 619 | static int |
| 620 | raw3215_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; |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 628 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | raw3215_try_io(raw); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 630 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Shutdown a 3215 device. |
| 637 | */ |
| 638 | static void |
| 639 | raw3215_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 */ |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 647 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 654 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | schedule(); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 656 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | remove_wait_queue(&raw->empty_wait, &wait); |
| 658 | set_current_state(TASK_RUNNING); |
| 659 | raw->flags &= ~(RAW3215_ACTIVE | RAW3215_CLOSING); |
| 660 | } |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 661 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | static int |
| 665 | raw3215_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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | raw->inbuf = (char *) raw + sizeof(struct raw3215_info); |
| 690 | memset(raw, 0, sizeof(struct raw3215_info)); |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame^] | 691 | raw->buffer = kmalloc(RAW3215_BUFFER_SIZE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | GFP_KERNEL|GFP_DMA); |
| 693 | if (raw->buffer == NULL) { |
| 694 | spin_lock(&raw3215_device_lock); |
Heiko Carstens | d2c993d | 2006-07-12 16:41:55 +0200 | [diff] [blame] | 695 | raw3215[line] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 711 | static void |
| 712 | raw3215_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; |
Jesper Juhl | 17fd682 | 2005-11-07 01:01:30 -0800 | [diff] [blame] | 720 | kfree(raw->buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | kfree(raw); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | static int |
| 726 | raw3215_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 | |
| 737 | static int |
| 738 | raw3215_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 | |
| 751 | static struct ccw_device_id raw3215_id[] = { |
| 752 | { CCW_DEVICE(0x3215, 0) }, |
| 753 | { /* end of list */ }, |
| 754 | }; |
| 755 | |
| 756 | static 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 | */ |
| 770 | static void |
| 771 | con3215_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 | |
| 794 | static 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 | */ |
| 804 | static void |
| 805 | con3215_unblank(void) |
| 806 | { |
| 807 | struct raw3215_info *raw; |
| 808 | unsigned long flags; |
| 809 | |
| 810 | raw = raw3215[0]; /* console 3215 is the first one */ |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 811 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | raw3215_make_room(raw, RAW3215_BUFFER_SIZE); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 813 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | static int __init |
| 817 | con3215_consetup(struct console *co, char *options) |
| 818 | { |
| 819 | return 0; |
| 820 | } |
| 821 | |
| 822 | /* |
| 823 | * The console structure for the 3215 console |
| 824 | */ |
| 825 | static struct console con3215 = { |
| 826 | .name = "ttyS", |
| 827 | .write = con3215_write, |
| 828 | .device = con3215_device, |
| 829 | .unblank = con3215_unblank, |
| 830 | .setup = con3215_consetup, |
| 831 | .flags = CON_PRINTBUFFER, |
| 832 | }; |
| 833 | |
| 834 | /* |
| 835 | * 3215 console initialization code called from console_init(). |
| 836 | * NOTE: This is called before kmalloc is available. |
| 837 | */ |
| 838 | static int __init |
| 839 | con3215_init(void) |
| 840 | { |
| 841 | struct ccw_device *cdev; |
| 842 | struct raw3215_info *raw; |
| 843 | struct raw3215_req *req; |
| 844 | int i; |
| 845 | |
| 846 | /* Check if 3215 is to be the console */ |
| 847 | if (!CONSOLE_IS_3215) |
| 848 | return -ENODEV; |
| 849 | |
| 850 | /* Set the console mode for VM */ |
| 851 | if (MACHINE_IS_VM) { |
Christian Borntraeger | 6b979de | 2005-06-25 14:55:32 -0700 | [diff] [blame] | 852 | cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
| 853 | cpcmd("TERM AUTOCR OFF", NULL, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | /* allocate 3215 request structures */ |
| 857 | raw3215_freelist = NULL; |
| 858 | spin_lock_init(&raw3215_freelist_lock); |
| 859 | for (i = 0; i < NR_3215_REQ; i++) { |
| 860 | req = (struct raw3215_req *) alloc_bootmem_low(sizeof(struct raw3215_req)); |
| 861 | req->next = raw3215_freelist; |
| 862 | raw3215_freelist = req; |
| 863 | } |
| 864 | |
| 865 | cdev = ccw_device_probe_console(); |
Peter Oberparleiter | 600b5d1 | 2006-02-01 03:06:35 -0800 | [diff] [blame] | 866 | if (IS_ERR(cdev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | return -ENODEV; |
| 868 | |
| 869 | raw3215[0] = raw = (struct raw3215_info *) |
| 870 | alloc_bootmem_low(sizeof(struct raw3215_info)); |
| 871 | memset(raw, 0, sizeof(struct raw3215_info)); |
| 872 | raw->buffer = (char *) alloc_bootmem_low(RAW3215_BUFFER_SIZE); |
| 873 | raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE); |
| 874 | raw->cdev = cdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | cdev->dev.driver_data = raw; |
| 876 | cdev->handler = raw3215_irq; |
| 877 | |
| 878 | raw->flags |= RAW3215_FIXED; |
| 879 | tasklet_init(&raw->tasklet, |
| 880 | (void (*)(unsigned long)) raw3215_tasklet, |
| 881 | (unsigned long) raw); |
| 882 | init_waitqueue_head(&raw->empty_wait); |
| 883 | |
| 884 | /* Request the console irq */ |
| 885 | if (raw3215_startup(raw) != 0) { |
| 886 | free_bootmem((unsigned long) raw->inbuf, RAW3215_INBUF_SIZE); |
| 887 | free_bootmem((unsigned long) raw->buffer, RAW3215_BUFFER_SIZE); |
| 888 | free_bootmem((unsigned long) raw, sizeof(struct raw3215_info)); |
| 889 | raw3215[0] = NULL; |
| 890 | printk("Couldn't find a 3215 console device\n"); |
| 891 | return -ENODEV; |
| 892 | } |
| 893 | register_console(&con3215); |
| 894 | return 0; |
| 895 | } |
| 896 | console_initcall(con3215_init); |
| 897 | #endif |
| 898 | |
| 899 | /* |
| 900 | * tty3215_open |
| 901 | * |
| 902 | * This routine is called whenever a 3215 tty is opened. |
| 903 | */ |
| 904 | static int |
| 905 | tty3215_open(struct tty_struct *tty, struct file * filp) |
| 906 | { |
| 907 | struct raw3215_info *raw; |
| 908 | int retval, line; |
| 909 | |
| 910 | line = tty->index; |
| 911 | if ((line < 0) || (line >= NR_3215)) |
| 912 | return -ENODEV; |
| 913 | |
| 914 | raw = raw3215[line]; |
| 915 | if (raw == NULL) |
| 916 | return -ENODEV; |
| 917 | |
| 918 | tty->driver_data = raw; |
| 919 | raw->tty = tty; |
| 920 | |
| 921 | tty->low_latency = 0; /* don't use bottom half for pushing chars */ |
| 922 | /* |
| 923 | * Start up 3215 device |
| 924 | */ |
| 925 | retval = raw3215_startup(raw); |
| 926 | if (retval) |
| 927 | return retval; |
| 928 | |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | /* |
| 933 | * tty3215_close() |
| 934 | * |
| 935 | * This routine is called when the 3215 tty is closed. We wait |
| 936 | * for the remaining request to be completed. Then we clean up. |
| 937 | */ |
| 938 | static void |
| 939 | tty3215_close(struct tty_struct *tty, struct file * filp) |
| 940 | { |
| 941 | struct raw3215_info *raw; |
| 942 | |
| 943 | raw = (struct raw3215_info *) tty->driver_data; |
| 944 | if (raw == NULL || tty->count > 1) |
| 945 | return; |
| 946 | tty->closing = 1; |
| 947 | /* Shutdown the terminal */ |
| 948 | raw3215_shutdown(raw); |
| 949 | tty->closing = 0; |
| 950 | raw->tty = NULL; |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | * Returns the amount of free space in the output buffer. |
| 955 | */ |
| 956 | static int |
| 957 | tty3215_write_room(struct tty_struct *tty) |
| 958 | { |
| 959 | struct raw3215_info *raw; |
| 960 | |
| 961 | raw = (struct raw3215_info *) tty->driver_data; |
| 962 | |
| 963 | /* Subtract TAB_STOP_SIZE to allow for a tab, 8 <<< 64K */ |
| 964 | if ((RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE) >= 0) |
| 965 | return RAW3215_BUFFER_SIZE - raw->count - TAB_STOP_SIZE; |
| 966 | else |
| 967 | return 0; |
| 968 | } |
| 969 | |
| 970 | /* |
| 971 | * String write routine for 3215 ttys |
| 972 | */ |
| 973 | static int |
| 974 | tty3215_write(struct tty_struct * tty, |
| 975 | const unsigned char *buf, int count) |
| 976 | { |
| 977 | struct raw3215_info *raw; |
| 978 | |
| 979 | if (!tty) |
| 980 | return 0; |
| 981 | raw = (struct raw3215_info *) tty->driver_data; |
| 982 | raw3215_write(raw, buf, count); |
| 983 | return count; |
| 984 | } |
| 985 | |
| 986 | /* |
| 987 | * Put character routine for 3215 ttys |
| 988 | */ |
| 989 | static void |
| 990 | tty3215_put_char(struct tty_struct *tty, unsigned char ch) |
| 991 | { |
| 992 | struct raw3215_info *raw; |
| 993 | |
| 994 | if (!tty) |
| 995 | return; |
| 996 | raw = (struct raw3215_info *) tty->driver_data; |
| 997 | raw3215_putchar(raw, ch); |
| 998 | } |
| 999 | |
| 1000 | static void |
| 1001 | tty3215_flush_chars(struct tty_struct *tty) |
| 1002 | { |
| 1003 | } |
| 1004 | |
| 1005 | /* |
| 1006 | * Returns the number of characters in the output buffer |
| 1007 | */ |
| 1008 | static int |
| 1009 | tty3215_chars_in_buffer(struct tty_struct *tty) |
| 1010 | { |
| 1011 | struct raw3215_info *raw; |
| 1012 | |
| 1013 | raw = (struct raw3215_info *) tty->driver_data; |
| 1014 | return raw->count; |
| 1015 | } |
| 1016 | |
| 1017 | static void |
| 1018 | tty3215_flush_buffer(struct tty_struct *tty) |
| 1019 | { |
| 1020 | struct raw3215_info *raw; |
| 1021 | |
| 1022 | raw = (struct raw3215_info *) tty->driver_data; |
| 1023 | raw3215_flush_buffer(raw); |
| 1024 | tty_wakeup(tty); |
| 1025 | } |
| 1026 | |
| 1027 | /* |
| 1028 | * Currently we don't have any io controls for 3215 ttys |
| 1029 | */ |
| 1030 | static int |
| 1031 | tty3215_ioctl(struct tty_struct *tty, struct file * file, |
| 1032 | unsigned int cmd, unsigned long arg) |
| 1033 | { |
| 1034 | if (tty->flags & (1 << TTY_IO_ERROR)) |
| 1035 | return -EIO; |
| 1036 | |
| 1037 | switch (cmd) { |
| 1038 | default: |
| 1039 | return -ENOIOCTLCMD; |
| 1040 | } |
| 1041 | return 0; |
| 1042 | } |
| 1043 | |
| 1044 | /* |
| 1045 | * Disable reading from a 3215 tty |
| 1046 | */ |
| 1047 | static void |
| 1048 | tty3215_throttle(struct tty_struct * tty) |
| 1049 | { |
| 1050 | struct raw3215_info *raw; |
| 1051 | |
| 1052 | raw = (struct raw3215_info *) tty->driver_data; |
| 1053 | raw->flags |= RAW3215_THROTTLED; |
| 1054 | } |
| 1055 | |
| 1056 | /* |
| 1057 | * Enable reading from a 3215 tty |
| 1058 | */ |
| 1059 | static void |
| 1060 | tty3215_unthrottle(struct tty_struct * tty) |
| 1061 | { |
| 1062 | struct raw3215_info *raw; |
| 1063 | unsigned long flags; |
| 1064 | |
| 1065 | raw = (struct raw3215_info *) tty->driver_data; |
| 1066 | if (raw->flags & RAW3215_THROTTLED) { |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 1067 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | raw->flags &= ~RAW3215_THROTTLED; |
| 1069 | raw3215_try_io(raw); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 1070 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | /* |
| 1075 | * Disable writing to a 3215 tty |
| 1076 | */ |
| 1077 | static void |
| 1078 | tty3215_stop(struct tty_struct *tty) |
| 1079 | { |
| 1080 | struct raw3215_info *raw; |
| 1081 | |
| 1082 | raw = (struct raw3215_info *) tty->driver_data; |
| 1083 | raw->flags |= RAW3215_STOPPED; |
| 1084 | } |
| 1085 | |
| 1086 | /* |
| 1087 | * Enable writing to a 3215 tty |
| 1088 | */ |
| 1089 | static void |
| 1090 | tty3215_start(struct tty_struct *tty) |
| 1091 | { |
| 1092 | struct raw3215_info *raw; |
| 1093 | unsigned long flags; |
| 1094 | |
| 1095 | raw = (struct raw3215_info *) tty->driver_data; |
| 1096 | if (raw->flags & RAW3215_STOPPED) { |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 1097 | spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | raw->flags &= ~RAW3215_STOPPED; |
| 1099 | raw3215_try_io(raw); |
Martin Schwidefsky | 520a4e3 | 2006-12-04 15:40:07 +0100 | [diff] [blame] | 1100 | spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | } |
| 1102 | } |
| 1103 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 1104 | static const struct tty_operations tty3215_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | .open = tty3215_open, |
| 1106 | .close = tty3215_close, |
| 1107 | .write = tty3215_write, |
| 1108 | .put_char = tty3215_put_char, |
| 1109 | .flush_chars = tty3215_flush_chars, |
| 1110 | .write_room = tty3215_write_room, |
| 1111 | .chars_in_buffer = tty3215_chars_in_buffer, |
| 1112 | .flush_buffer = tty3215_flush_buffer, |
| 1113 | .ioctl = tty3215_ioctl, |
| 1114 | .throttle = tty3215_throttle, |
| 1115 | .unthrottle = tty3215_unthrottle, |
| 1116 | .stop = tty3215_stop, |
| 1117 | .start = tty3215_start, |
| 1118 | }; |
| 1119 | |
| 1120 | /* |
| 1121 | * 3215 tty registration code called from tty_init(). |
| 1122 | * Most kernel services (incl. kmalloc) are available at this poimt. |
| 1123 | */ |
| 1124 | int __init |
| 1125 | tty3215_init(void) |
| 1126 | { |
| 1127 | struct tty_driver *driver; |
| 1128 | int ret; |
| 1129 | |
| 1130 | if (!CONSOLE_IS_3215) |
| 1131 | return 0; |
| 1132 | |
| 1133 | driver = alloc_tty_driver(NR_3215); |
| 1134 | if (!driver) |
| 1135 | return -ENOMEM; |
| 1136 | |
| 1137 | ret = ccw_driver_register(&raw3215_ccw_driver); |
| 1138 | if (ret) { |
| 1139 | put_tty_driver(driver); |
| 1140 | return ret; |
| 1141 | } |
| 1142 | /* |
| 1143 | * Initialize the tty_driver structure |
| 1144 | * Entries in tty3215_driver that are NOT initialized: |
| 1145 | * proc_entry, set_termios, flush_buffer, set_ldisc, write_proc |
| 1146 | */ |
| 1147 | |
| 1148 | driver->owner = THIS_MODULE; |
| 1149 | driver->driver_name = "tty3215"; |
| 1150 | driver->name = "ttyS"; |
| 1151 | driver->major = TTY_MAJOR; |
| 1152 | driver->minor_start = 64; |
| 1153 | driver->type = TTY_DRIVER_TYPE_SYSTEM; |
| 1154 | driver->subtype = SYSTEM_TYPE_TTY; |
| 1155 | driver->init_termios = tty_std_termios; |
| 1156 | driver->init_termios.c_iflag = IGNBRK | IGNPAR; |
| 1157 | driver->init_termios.c_oflag = ONLCR | XTABS; |
| 1158 | driver->init_termios.c_lflag = ISIG; |
| 1159 | driver->flags = TTY_DRIVER_REAL_RAW; |
| 1160 | tty_set_operations(driver, &tty3215_ops); |
| 1161 | ret = tty_register_driver(driver); |
| 1162 | if (ret) { |
| 1163 | printk("Couldn't register tty3215 driver\n"); |
| 1164 | put_tty_driver(driver); |
| 1165 | return ret; |
| 1166 | } |
| 1167 | tty3215_driver = driver; |
| 1168 | return 0; |
| 1169 | } |
| 1170 | |
| 1171 | static void __exit |
| 1172 | tty3215_exit(void) |
| 1173 | { |
| 1174 | tty_unregister_driver(tty3215_driver); |
| 1175 | put_tty_driver(tty3215_driver); |
| 1176 | ccw_driver_unregister(&raw3215_ccw_driver); |
| 1177 | } |
| 1178 | |
| 1179 | module_init(tty3215_init); |
| 1180 | module_exit(tty3215_exit); |