| 1 | /* |
| 2 | * iSeries vio driver interface to hvc_console.c |
| 3 | * |
| 4 | * This code is based heavily on hvc_vio.c and viocons.c |
| 5 | * |
| 6 | * Copyright (C) 2006 Stephen Rothwell, IBM Corporation |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
| 22 | #include <stdarg.h> |
| 23 | #include <linux/types.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/spinlock.h> |
| 27 | #include <linux/console.h> |
| 28 | |
| 29 | #include <asm/hvconsole.h> |
| 30 | #include <asm/vio.h> |
| 31 | #include <asm/prom.h> |
| 32 | #include <asm/firmware.h> |
| 33 | #include <asm/iseries/vio.h> |
| 34 | #include <asm/iseries/hv_call.h> |
| 35 | #include <asm/iseries/hv_lp_config.h> |
| 36 | #include <asm/iseries/hv_lp_event.h> |
| 37 | |
| 38 | #include "hvc_console.h" |
| 39 | |
| 40 | #define VTTY_PORTS 10 |
| 41 | |
| 42 | static DEFINE_SPINLOCK(consolelock); |
| 43 | static DEFINE_SPINLOCK(consoleloglock); |
| 44 | |
| 45 | static const char hvc_driver_name[] = "hvc_console"; |
| 46 | |
| 47 | #define IN_BUF_SIZE 200 |
| 48 | |
| 49 | /* |
| 50 | * Our port information. |
| 51 | */ |
| 52 | static struct port_info { |
| 53 | HvLpIndex lp; |
| 54 | u64 seq; /* sequence number of last HV send */ |
| 55 | u64 ack; /* last ack from HV */ |
| 56 | struct hvc_struct *hp; |
| 57 | int in_start; |
| 58 | int in_end; |
| 59 | unsigned char in_buf[IN_BUF_SIZE]; |
| 60 | } port_info[VTTY_PORTS] = { |
| 61 | [ 0 ... VTTY_PORTS - 1 ] = { |
| 62 | .lp = HvLpIndexInvalid |
| 63 | } |
| 64 | }; |
| 65 | |
| 66 | #define viochar_is_console(pi) ((pi) == &port_info[0]) |
| 67 | |
| 68 | static struct vio_device_id hvc_driver_table[] __devinitdata = { |
| 69 | {"serial", "IBM,iSeries-vty"}, |
| 70 | { "", "" } |
| 71 | }; |
| 72 | MODULE_DEVICE_TABLE(vio, hvc_driver_table); |
| 73 | |
| 74 | static void hvlog(char *fmt, ...) |
| 75 | { |
| 76 | int i; |
| 77 | unsigned long flags; |
| 78 | va_list args; |
| 79 | static char buf[256]; |
| 80 | |
| 81 | spin_lock_irqsave(&consoleloglock, flags); |
| 82 | va_start(args, fmt); |
| 83 | i = vscnprintf(buf, sizeof(buf) - 1, fmt, args); |
| 84 | va_end(args); |
| 85 | buf[i++] = '\r'; |
| 86 | HvCall_writeLogBuffer(buf, i); |
| 87 | spin_unlock_irqrestore(&consoleloglock, flags); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Initialize the common fields in a charLpEvent |
| 92 | */ |
| 93 | static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp) |
| 94 | { |
| 95 | struct HvLpEvent *hev = &viochar->event; |
| 96 | |
| 97 | memset(viochar, 0, sizeof(struct viocharlpevent)); |
| 98 | |
| 99 | hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK | |
| 100 | HV_LP_EVENT_INT; |
| 101 | hev->xType = HvLpEvent_Type_VirtualIo; |
| 102 | hev->xSubtype = viomajorsubtype_chario | viochardata; |
| 103 | hev->xSourceLp = HvLpConfig_getLpIndex(); |
| 104 | hev->xTargetLp = lp; |
| 105 | hev->xSizeMinus1 = sizeof(struct viocharlpevent); |
| 106 | hev->xSourceInstanceId = viopath_sourceinst(lp); |
| 107 | hev->xTargetInstanceId = viopath_targetinst(lp); |
| 108 | } |
| 109 | |
| 110 | static int get_chars(uint32_t vtermno, char *buf, int count) |
| 111 | { |
| 112 | struct port_info *pi; |
| 113 | int n = 0; |
| 114 | unsigned long flags; |
| 115 | |
| 116 | if (vtermno >= VTTY_PORTS) |
| 117 | return -EINVAL; |
| 118 | if (count == 0) |
| 119 | return 0; |
| 120 | |
| 121 | pi = &port_info[vtermno]; |
| 122 | spin_lock_irqsave(&consolelock, flags); |
| 123 | |
| 124 | if (pi->in_end == 0) |
| 125 | goto done; |
| 126 | |
| 127 | n = pi->in_end - pi->in_start; |
| 128 | if (n > count) |
| 129 | n = count; |
| 130 | memcpy(buf, &pi->in_buf[pi->in_start], n); |
| 131 | pi->in_start += n; |
| 132 | if (pi->in_start == pi->in_end) { |
| 133 | pi->in_start = 0; |
| 134 | pi->in_end = 0; |
| 135 | } |
| 136 | done: |
| 137 | spin_unlock_irqrestore(&consolelock, flags); |
| 138 | return n; |
| 139 | } |
| 140 | |
| 141 | static int put_chars(uint32_t vtermno, const char *buf, int count) |
| 142 | { |
| 143 | struct viocharlpevent *viochar; |
| 144 | struct port_info *pi; |
| 145 | HvLpEvent_Rc hvrc; |
| 146 | unsigned long flags; |
| 147 | int sent = 0; |
| 148 | |
| 149 | if (vtermno >= VTTY_PORTS) |
| 150 | return -EINVAL; |
| 151 | |
| 152 | pi = &port_info[vtermno]; |
| 153 | |
| 154 | spin_lock_irqsave(&consolelock, flags); |
| 155 | |
| 156 | if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) { |
| 157 | HvCall_writeLogBuffer(buf, count); |
| 158 | sent = count; |
| 159 | goto done; |
| 160 | } |
| 161 | |
| 162 | viochar = vio_get_event_buffer(viomajorsubtype_chario); |
| 163 | if (viochar == NULL) { |
| 164 | hvlog("\n\rviocons: Can't get viochar buffer."); |
| 165 | goto done; |
| 166 | } |
| 167 | |
| 168 | while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { |
| 169 | int len; |
| 170 | |
| 171 | len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count; |
| 172 | |
| 173 | if (viochar_is_console(pi)) |
| 174 | HvCall_writeLogBuffer(buf, len); |
| 175 | |
| 176 | init_data_event(viochar, pi->lp); |
| 177 | |
| 178 | viochar->len = len; |
| 179 | viochar->event.xCorrelationToken = pi->seq++; |
| 180 | viochar->event.xSizeMinus1 = |
| 181 | offsetof(struct viocharlpevent, data) + len; |
| 182 | |
| 183 | memcpy(viochar->data, buf, len); |
| 184 | |
| 185 | hvrc = HvCallEvent_signalLpEvent(&viochar->event); |
| 186 | if (hvrc) |
| 187 | hvlog("\n\rerror sending event! return code %d\n\r", |
| 188 | (int)hvrc); |
| 189 | sent += len; |
| 190 | count -= len; |
| 191 | buf += len; |
| 192 | } |
| 193 | |
| 194 | vio_free_event_buffer(viomajorsubtype_chario, viochar); |
| 195 | done: |
| 196 | spin_unlock_irqrestore(&consolelock, flags); |
| 197 | return sent; |
| 198 | } |
| 199 | |
| 200 | static struct hv_ops hvc_get_put_ops = { |
| 201 | .get_chars = get_chars, |
| 202 | .put_chars = put_chars, |
| 203 | .notifier_add = notifier_add_irq, |
| 204 | .notifier_del = notifier_del_irq, |
| 205 | .notifier_hangup = notifier_hangup_irq, |
| 206 | }; |
| 207 | |
| 208 | static int __devinit hvc_vio_probe(struct vio_dev *vdev, |
| 209 | const struct vio_device_id *id) |
| 210 | { |
| 211 | struct hvc_struct *hp; |
| 212 | struct port_info *pi; |
| 213 | |
| 214 | /* probed with invalid parameters. */ |
| 215 | if (!vdev || !id) |
| 216 | return -EPERM; |
| 217 | |
| 218 | if (vdev->unit_address >= VTTY_PORTS) |
| 219 | return -ENODEV; |
| 220 | |
| 221 | pi = &port_info[vdev->unit_address]; |
| 222 | |
| 223 | hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops, |
| 224 | VIOCHAR_MAX_DATA); |
| 225 | if (IS_ERR(hp)) |
| 226 | return PTR_ERR(hp); |
| 227 | pi->hp = hp; |
| 228 | dev_set_drvdata(&vdev->dev, pi); |
| 229 | |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static int __devexit hvc_vio_remove(struct vio_dev *vdev) |
| 234 | { |
| 235 | struct port_info *pi = dev_get_drvdata(&vdev->dev); |
| 236 | struct hvc_struct *hp = pi->hp; |
| 237 | |
| 238 | return hvc_remove(hp); |
| 239 | } |
| 240 | |
| 241 | static struct vio_driver hvc_vio_driver = { |
| 242 | .id_table = hvc_driver_table, |
| 243 | .probe = hvc_vio_probe, |
| 244 | .remove = __devexit_p(hvc_vio_remove), |
| 245 | .driver = { |
| 246 | .name = hvc_driver_name, |
| 247 | .owner = THIS_MODULE, |
| 248 | } |
| 249 | }; |
| 250 | |
| 251 | static void hvc_open_event(struct HvLpEvent *event) |
| 252 | { |
| 253 | unsigned long flags; |
| 254 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; |
| 255 | u8 port = cevent->virtual_device; |
| 256 | struct port_info *pi; |
| 257 | int reject = 0; |
| 258 | |
| 259 | if (hvlpevent_is_ack(event)) { |
| 260 | if (port >= VTTY_PORTS) |
| 261 | return; |
| 262 | |
| 263 | spin_lock_irqsave(&consolelock, flags); |
| 264 | |
| 265 | pi = &port_info[port]; |
| 266 | if (event->xRc == HvLpEvent_Rc_Good) { |
| 267 | pi->seq = pi->ack = 0; |
| 268 | /* |
| 269 | * This line allows connections from the primary |
| 270 | * partition but once one is connected from the |
| 271 | * primary partition nothing short of a reboot |
| 272 | * of linux will allow access from the hosting |
| 273 | * partition again without a required iSeries fix. |
| 274 | */ |
| 275 | pi->lp = event->xTargetLp; |
| 276 | } |
| 277 | |
| 278 | spin_unlock_irqrestore(&consolelock, flags); |
| 279 | if (event->xRc != HvLpEvent_Rc_Good) |
| 280 | printk(KERN_WARNING |
| 281 | "hvc: handle_open_event: event->xRc == (%d).\n", |
| 282 | event->xRc); |
| 283 | |
| 284 | if (event->xCorrelationToken != 0) { |
| 285 | atomic_t *aptr= (atomic_t *)event->xCorrelationToken; |
| 286 | atomic_set(aptr, 1); |
| 287 | } else |
| 288 | printk(KERN_WARNING |
| 289 | "hvc: weird...got open ack without atomic\n"); |
| 290 | return; |
| 291 | } |
| 292 | |
| 293 | /* This had better require an ack, otherwise complain */ |
| 294 | if (!hvlpevent_need_ack(event)) { |
| 295 | printk(KERN_WARNING "hvc: viocharopen without ack bit!\n"); |
| 296 | return; |
| 297 | } |
| 298 | |
| 299 | spin_lock_irqsave(&consolelock, flags); |
| 300 | |
| 301 | /* Make sure this is a good virtual tty */ |
| 302 | if (port >= VTTY_PORTS) { |
| 303 | event->xRc = HvLpEvent_Rc_SubtypeError; |
| 304 | cevent->subtype_result_code = viorc_openRejected; |
| 305 | /* |
| 306 | * Flag state here since we can't printk while holding |
| 307 | * the consolelock spinlock. |
| 308 | */ |
| 309 | reject = 1; |
| 310 | } else { |
| 311 | pi = &port_info[port]; |
| 312 | if ((pi->lp != HvLpIndexInvalid) && |
| 313 | (pi->lp != event->xSourceLp)) { |
| 314 | /* |
| 315 | * If this is tty is already connected to a different |
| 316 | * partition, fail. |
| 317 | */ |
| 318 | event->xRc = HvLpEvent_Rc_SubtypeError; |
| 319 | cevent->subtype_result_code = viorc_openRejected; |
| 320 | reject = 2; |
| 321 | } else { |
| 322 | pi->lp = event->xSourceLp; |
| 323 | event->xRc = HvLpEvent_Rc_Good; |
| 324 | cevent->subtype_result_code = viorc_good; |
| 325 | pi->seq = pi->ack = 0; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | spin_unlock_irqrestore(&consolelock, flags); |
| 330 | |
| 331 | if (reject == 1) |
| 332 | printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n"); |
| 333 | else if (reject == 2) |
| 334 | printk(KERN_WARNING "hvc: open rejected: console in exclusive " |
| 335 | "use by another partition.\n"); |
| 336 | |
| 337 | /* Return the acknowledgement */ |
| 338 | HvCallEvent_ackLpEvent(event); |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * Handle a close charLpEvent. This should ONLY be an Interrupt because the |
| 343 | * virtual console should never actually issue a close event to the hypervisor |
| 344 | * because the virtual console never goes away. A close event coming from the |
| 345 | * hypervisor simply means that there are no client consoles connected to the |
| 346 | * virtual console. |
| 347 | */ |
| 348 | static void hvc_close_event(struct HvLpEvent *event) |
| 349 | { |
| 350 | unsigned long flags; |
| 351 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; |
| 352 | u8 port = cevent->virtual_device; |
| 353 | |
| 354 | if (!hvlpevent_is_int(event)) { |
| 355 | printk(KERN_WARNING |
| 356 | "hvc: got unexpected close acknowlegement\n"); |
| 357 | return; |
| 358 | } |
| 359 | |
| 360 | if (port >= VTTY_PORTS) { |
| 361 | printk(KERN_WARNING |
| 362 | "hvc: close message from invalid virtual device.\n"); |
| 363 | return; |
| 364 | } |
| 365 | |
| 366 | /* For closes, just mark the console partition invalid */ |
| 367 | spin_lock_irqsave(&consolelock, flags); |
| 368 | |
| 369 | if (port_info[port].lp == event->xSourceLp) |
| 370 | port_info[port].lp = HvLpIndexInvalid; |
| 371 | |
| 372 | spin_unlock_irqrestore(&consolelock, flags); |
| 373 | } |
| 374 | |
| 375 | static void hvc_data_event(struct HvLpEvent *event) |
| 376 | { |
| 377 | unsigned long flags; |
| 378 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; |
| 379 | struct port_info *pi; |
| 380 | int n; |
| 381 | u8 port = cevent->virtual_device; |
| 382 | |
| 383 | if (port >= VTTY_PORTS) { |
| 384 | printk(KERN_WARNING "hvc: data on invalid virtual device %d\n", |
| 385 | port); |
| 386 | return; |
| 387 | } |
| 388 | if (cevent->len == 0) |
| 389 | return; |
| 390 | |
| 391 | /* |
| 392 | * Change 05/01/2003 - Ryan Arnold: If a partition other than |
| 393 | * the current exclusive partition tries to send us data |
| 394 | * events then just drop them on the floor because we don't |
| 395 | * want his stinking data. He isn't authorized to receive |
| 396 | * data because he wasn't the first one to get the console, |
| 397 | * therefore he shouldn't be allowed to send data either. |
| 398 | * This will work without an iSeries fix. |
| 399 | */ |
| 400 | pi = &port_info[port]; |
| 401 | if (pi->lp != event->xSourceLp) |
| 402 | return; |
| 403 | |
| 404 | spin_lock_irqsave(&consolelock, flags); |
| 405 | |
| 406 | n = IN_BUF_SIZE - pi->in_end; |
| 407 | if (n > cevent->len) |
| 408 | n = cevent->len; |
| 409 | if (n > 0) { |
| 410 | memcpy(&pi->in_buf[pi->in_end], cevent->data, n); |
| 411 | pi->in_end += n; |
| 412 | } |
| 413 | spin_unlock_irqrestore(&consolelock, flags); |
| 414 | if (n == 0) |
| 415 | printk(KERN_WARNING "hvc: input buffer overflow\n"); |
| 416 | } |
| 417 | |
| 418 | static void hvc_ack_event(struct HvLpEvent *event) |
| 419 | { |
| 420 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; |
| 421 | unsigned long flags; |
| 422 | u8 port = cevent->virtual_device; |
| 423 | |
| 424 | if (port >= VTTY_PORTS) { |
| 425 | printk(KERN_WARNING "hvc: data on invalid virtual device\n"); |
| 426 | return; |
| 427 | } |
| 428 | |
| 429 | spin_lock_irqsave(&consolelock, flags); |
| 430 | port_info[port].ack = event->xCorrelationToken; |
| 431 | spin_unlock_irqrestore(&consolelock, flags); |
| 432 | } |
| 433 | |
| 434 | static void hvc_config_event(struct HvLpEvent *event) |
| 435 | { |
| 436 | struct viocharlpevent *cevent = (struct viocharlpevent *)event; |
| 437 | |
| 438 | if (cevent->data[0] == 0x01) |
| 439 | printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n", |
| 440 | cevent->data[1], cevent->data[2], |
| 441 | cevent->data[3], cevent->data[4]); |
| 442 | else |
| 443 | printk(KERN_WARNING "hvc: unknown config event\n"); |
| 444 | } |
| 445 | |
| 446 | static void hvc_handle_event(struct HvLpEvent *event) |
| 447 | { |
| 448 | int charminor; |
| 449 | |
| 450 | if (event == NULL) |
| 451 | return; |
| 452 | |
| 453 | charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK; |
| 454 | switch (charminor) { |
| 455 | case viocharopen: |
| 456 | hvc_open_event(event); |
| 457 | break; |
| 458 | case viocharclose: |
| 459 | hvc_close_event(event); |
| 460 | break; |
| 461 | case viochardata: |
| 462 | hvc_data_event(event); |
| 463 | break; |
| 464 | case viocharack: |
| 465 | hvc_ack_event(event); |
| 466 | break; |
| 467 | case viocharconfig: |
| 468 | hvc_config_event(event); |
| 469 | break; |
| 470 | default: |
| 471 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { |
| 472 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
| 473 | HvCallEvent_ackLpEvent(event); |
| 474 | } |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | static int __init send_open(HvLpIndex remoteLp, void *sem) |
| 479 | { |
| 480 | return HvCallEvent_signalLpEventFast(remoteLp, |
| 481 | HvLpEvent_Type_VirtualIo, |
| 482 | viomajorsubtype_chario | viocharopen, |
| 483 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, |
| 484 | viopath_sourceinst(remoteLp), |
| 485 | viopath_targetinst(remoteLp), |
| 486 | (u64)(unsigned long)sem, VIOVERSION << 16, |
| 487 | 0, 0, 0, 0); |
| 488 | } |
| 489 | |
| 490 | static int __init hvc_vio_init(void) |
| 491 | { |
| 492 | atomic_t wait_flag; |
| 493 | int rc; |
| 494 | |
| 495 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
| 496 | return -EIO; |
| 497 | |
| 498 | /* +2 for fudge */ |
| 499 | rc = viopath_open(HvLpConfig_getPrimaryLpIndex(), |
| 500 | viomajorsubtype_chario, VIOCHAR_WINDOW + 2); |
| 501 | if (rc) |
| 502 | printk(KERN_WARNING "hvc: error opening to primary %d\n", rc); |
| 503 | |
| 504 | if (viopath_hostLp == HvLpIndexInvalid) |
| 505 | vio_set_hostlp(); |
| 506 | |
| 507 | /* |
| 508 | * And if the primary is not the same as the hosting LP, open to the |
| 509 | * hosting lp |
| 510 | */ |
| 511 | if ((viopath_hostLp != HvLpIndexInvalid) && |
| 512 | (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) { |
| 513 | printk(KERN_INFO "hvc: open path to hosting (%d)\n", |
| 514 | viopath_hostLp); |
| 515 | rc = viopath_open(viopath_hostLp, viomajorsubtype_chario, |
| 516 | VIOCHAR_WINDOW + 2); /* +2 for fudge */ |
| 517 | if (rc) |
| 518 | printk(KERN_WARNING |
| 519 | "error opening to partition %d: %d\n", |
| 520 | viopath_hostLp, rc); |
| 521 | } |
| 522 | |
| 523 | if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0) |
| 524 | printk(KERN_WARNING |
| 525 | "hvc: error seting handler for console events!\n"); |
| 526 | |
| 527 | /* |
| 528 | * First, try to open the console to the hosting lp. |
| 529 | * Wait on a semaphore for the response. |
| 530 | */ |
| 531 | atomic_set(&wait_flag, 0); |
| 532 | if ((viopath_isactive(viopath_hostLp)) && |
| 533 | (send_open(viopath_hostLp, &wait_flag) == 0)) { |
| 534 | printk(KERN_INFO "hvc: hosting partition %d\n", viopath_hostLp); |
| 535 | while (atomic_read(&wait_flag) == 0) |
| 536 | mb(); |
| 537 | atomic_set(&wait_flag, 0); |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * If we don't have an active console, try the primary |
| 542 | */ |
| 543 | if ((!viopath_isactive(port_info[0].lp)) && |
| 544 | (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) && |
| 545 | (send_open(HvLpConfig_getPrimaryLpIndex(), &wait_flag) == 0)) { |
| 546 | printk(KERN_INFO "hvc: opening console to primary partition\n"); |
| 547 | while (atomic_read(&wait_flag) == 0) |
| 548 | mb(); |
| 549 | } |
| 550 | |
| 551 | /* Register as a vio device to receive callbacks */ |
| 552 | rc = vio_register_driver(&hvc_vio_driver); |
| 553 | |
| 554 | return rc; |
| 555 | } |
| 556 | module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */ |
| 557 | |
| 558 | static void __exit hvc_vio_exit(void) |
| 559 | { |
| 560 | vio_unregister_driver(&hvc_vio_driver); |
| 561 | } |
| 562 | module_exit(hvc_vio_exit); |
| 563 | |
| 564 | /* the device tree order defines our numbering */ |
| 565 | static int __init hvc_find_vtys(void) |
| 566 | { |
| 567 | struct device_node *vty; |
| 568 | int num_found = 0; |
| 569 | |
| 570 | for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL; |
| 571 | vty = of_find_node_by_name(vty, "vty")) { |
| 572 | const uint32_t *vtermno; |
| 573 | |
| 574 | /* We have statically defined space for only a certain number |
| 575 | * of console adapters. |
| 576 | */ |
| 577 | if ((num_found >= MAX_NR_HVC_CONSOLES) || |
| 578 | (num_found >= VTTY_PORTS)) { |
| 579 | of_node_put(vty); |
| 580 | break; |
| 581 | } |
| 582 | |
| 583 | vtermno = of_get_property(vty, "reg", NULL); |
| 584 | if (!vtermno) |
| 585 | continue; |
| 586 | |
| 587 | if (!of_device_is_compatible(vty, "IBM,iSeries-vty")) |
| 588 | continue; |
| 589 | |
| 590 | if (num_found == 0) |
| 591 | add_preferred_console("hvc", 0, NULL); |
| 592 | hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops); |
| 593 | ++num_found; |
| 594 | } |
| 595 | |
| 596 | return num_found; |
| 597 | } |
| 598 | console_initcall(hvc_find_vtys); |