1/* 2 * c 2001 PPC 64 Team, IBM Corp 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * /proc/powerpc/rtas/firmware_flash interface 10 * 11 * This file implements a firmware_flash interface to pump a firmware 12 * image into the kernel. At reboot time rtas_restart() will see the 13 * firmware image and flash it as it reboots (see rtas.c). 14 */ 15 16#include <linux/module.h> 17#include <linux/init.h> 18#include <linux/slab.h> 19#include <linux/proc_fs.h> 20#include <linux/reboot.h> 21#include <asm/delay.h> 22#include <asm/uaccess.h> 23#include <asm/rtas.h> 24 25#define MODULE_VERS "1.0" 26#define MODULE_NAME "rtas_flash" 27 28#define FIRMWARE_FLASH_NAME "firmware_flash" 29#define FIRMWARE_UPDATE_NAME "firmware_update" 30#define MANAGE_FLASH_NAME "manage_flash" 31#define VALIDATE_FLASH_NAME "validate_flash" 32 33/* General RTAS Status Codes */ 34#define RTAS_RC_SUCCESS 0 35#define RTAS_RC_HW_ERR -1 36#define RTAS_RC_BUSY -2 37 38/* Flash image status values */ 39#define FLASH_AUTH -9002 /* RTAS Not Service Authority Partition */ 40#define FLASH_NO_OP -1099 /* No operation initiated by user */ 41#define FLASH_IMG_SHORT -1005 /* Flash image shorter than expected */ 42#define FLASH_IMG_BAD_LEN -1004 /* Bad length value in flash list block */ 43#define FLASH_IMG_NULL_DATA -1003 /* Bad data value in flash list block */ 44#define FLASH_IMG_READY 0 /* Firmware img ready for flash on reboot */ 45 46/* Manage image status values */ 47#define MANAGE_AUTH -9002 /* RTAS Not Service Authority Partition */ 48#define MANAGE_ACTIVE_ERR -9001 /* RTAS Cannot Overwrite Active Img */ 49#define MANAGE_NO_OP -1099 /* No operation initiated by user */ 50#define MANAGE_PARAM_ERR -3 /* RTAS Parameter Error */ 51#define MANAGE_HW_ERR -1 /* RTAS Hardware Error */ 52 53/* Validate image status values */ 54#define VALIDATE_AUTH -9002 /* RTAS Not Service Authority Partition */ 55#define VALIDATE_NO_OP -1099 /* No operation initiated by the user */ 56#define VALIDATE_INCOMPLETE -1002 /* User copied < VALIDATE_BUF_SIZE */ 57#define VALIDATE_READY -1001 /* Firmware image ready for validation */ 58#define VALIDATE_PARAM_ERR -3 /* RTAS Parameter Error */ 59#define VALIDATE_HW_ERR -1 /* RTAS Hardware Error */ 60 61/* ibm,validate-flash-image update result tokens */ 62#define VALIDATE_TMP_UPDATE 0 /* T side will be updated */ 63#define VALIDATE_FLASH_AUTH 1 /* Partition does not have authority */ 64#define VALIDATE_INVALID_IMG 2 /* Candidate image is not valid */ 65#define VALIDATE_CUR_UNKNOWN 3 /* Current fixpack level is unknown */ 66/* 67 * Current T side will be committed to P side before being replace with new 68 * image, and the new image is downlevel from current image 69 */ 70#define VALIDATE_TMP_COMMIT_DL 4 71/* 72 * Current T side will be committed to P side before being replaced with new 73 * image 74 */ 75#define VALIDATE_TMP_COMMIT 5 76/* 77 * T side will be updated with a downlevel image 78 */ 79#define VALIDATE_TMP_UPDATE_DL 6 80/* 81 * The candidate image's release date is later than the system's firmware 82 * service entitlement date - service warranty period has expired 83 */ 84#define VALIDATE_OUT_OF_WRNTY 7 85 86/* ibm,manage-flash-image operation tokens */ 87#define RTAS_REJECT_TMP_IMG 0 88#define RTAS_COMMIT_TMP_IMG 1 89 90/* Array sizes */ 91#define VALIDATE_BUF_SIZE 4096 92#define VALIDATE_MSG_LEN 256 93#define RTAS_MSG_MAXLEN 64 94 95/* Quirk - RTAS requires 4k list length and block size */ 96#define RTAS_BLKLIST_LENGTH 4096 97#define RTAS_BLK_SIZE 4096 98 99struct flash_block { 100 char *data; 101 unsigned long length; 102}; 103 104/* This struct is very similar but not identical to 105 * that needed by the rtas flash update. 106 * All we need to do for rtas is rewrite num_blocks 107 * into a version/length and translate the pointers 108 * to absolute. 109 */ 110#define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block)) 111struct flash_block_list { 112 unsigned long num_blocks; 113 struct flash_block_list *next; 114 struct flash_block blocks[FLASH_BLOCKS_PER_NODE]; 115}; 116 117static struct flash_block_list *rtas_firmware_flash_list; 118 119/* Use slab cache to guarantee 4k alignment */ 120static struct kmem_cache *flash_block_cache = NULL; 121 122#define FLASH_BLOCK_LIST_VERSION (1UL) 123 124/* 125 * Local copy of the flash block list. 126 * 127 * The rtas_firmware_flash_list varable will be 128 * set once the data is fully read. 129 * 130 * For convenience as we build the list we use virtual addrs, 131 * we do not fill in the version number, and the length field 132 * is treated as the number of entries currently in the block 133 * (i.e. not a byte count). This is all fixed when calling 134 * the flash routine. 135 */ 136 137/* Status int must be first member of struct */ 138struct rtas_update_flash_t 139{ 140 int status; /* Flash update status */ 141 struct flash_block_list *flist; /* Local copy of flash block list */ 142}; 143 144/* Status int must be first member of struct */ 145struct rtas_manage_flash_t 146{ 147 int status; /* Returned status */ 148}; 149 150/* Status int must be first member of struct */ 151struct rtas_validate_flash_t 152{ 153 int status; /* Returned status */ 154 char *buf; /* Candidate image buffer */ 155 unsigned int buf_size; /* Size of image buf */ 156 unsigned int update_results; /* Update results token */ 157}; 158 159static struct rtas_update_flash_t rtas_update_flash_data; 160static struct rtas_manage_flash_t rtas_manage_flash_data; 161static struct rtas_validate_flash_t rtas_validate_flash_data; 162static DEFINE_MUTEX(rtas_update_flash_mutex); 163static DEFINE_MUTEX(rtas_manage_flash_mutex); 164static DEFINE_MUTEX(rtas_validate_flash_mutex); 165 166/* Do simple sanity checks on the flash image. */ 167static int flash_list_valid(struct flash_block_list *flist) 168{ 169 struct flash_block_list *f; 170 int i; 171 unsigned long block_size, image_size; 172 173 /* Paranoid self test here. We also collect the image size. */ 174 image_size = 0; 175 for (f = flist; f; f = f->next) { 176 for (i = 0; i < f->num_blocks; i++) { 177 if (f->blocks[i].data == NULL) { 178 return FLASH_IMG_NULL_DATA; 179 } 180 block_size = f->blocks[i].length; 181 if (block_size <= 0 || block_size > RTAS_BLK_SIZE) { 182 return FLASH_IMG_BAD_LEN; 183 } 184 image_size += block_size; 185 } 186 } 187 188 if (image_size < (256 << 10)) { 189 if (image_size < 2) 190 return FLASH_NO_OP; 191 } 192 193 printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size); 194 195 return FLASH_IMG_READY; 196} 197 198static void free_flash_list(struct flash_block_list *f) 199{ 200 struct flash_block_list *next; 201 int i; 202 203 while (f) { 204 for (i = 0; i < f->num_blocks; i++) 205 kmem_cache_free(flash_block_cache, f->blocks[i].data); 206 next = f->next; 207 kmem_cache_free(flash_block_cache, f); 208 f = next; 209 } 210} 211 212static int rtas_flash_release(struct inode *inode, struct file *file) 213{ 214 struct rtas_update_flash_t *const uf = &rtas_update_flash_data; 215 216 mutex_lock(&rtas_update_flash_mutex); 217 218 if (uf->flist) { 219 /* File was opened in write mode for a new flash attempt */ 220 /* Clear saved list */ 221 if (rtas_firmware_flash_list) { 222 free_flash_list(rtas_firmware_flash_list); 223 rtas_firmware_flash_list = NULL; 224 } 225 226 if (uf->status != FLASH_AUTH) 227 uf->status = flash_list_valid(uf->flist); 228 229 if (uf->status == FLASH_IMG_READY) 230 rtas_firmware_flash_list = uf->flist; 231 else 232 free_flash_list(uf->flist); 233 234 uf->flist = NULL; 235 } 236 237 mutex_unlock(&rtas_update_flash_mutex); 238 return 0; 239} 240 241static size_t get_flash_status_msg(int status, char *buf) 242{ 243 const char *msg; 244 size_t len; 245 246 switch (status) { 247 case FLASH_AUTH: 248 msg = "error: this partition does not have service authority\n"; 249 break; 250 case FLASH_NO_OP: 251 msg = "info: no firmware image for flash\n"; 252 break; 253 case FLASH_IMG_SHORT: 254 msg = "error: flash image short\n"; 255 break; 256 case FLASH_IMG_BAD_LEN: 257 msg = "error: internal error bad length\n"; 258 break; 259 case FLASH_IMG_NULL_DATA: 260 msg = "error: internal error null data\n"; 261 break; 262 case FLASH_IMG_READY: 263 msg = "ready: firmware image ready for flash on reboot\n"; 264 break; 265 default: 266 return sprintf(buf, "error: unexpected status value %d\n", 267 status); 268 } 269 270 len = strlen(msg); 271 memcpy(buf, msg, len + 1); 272 return len; 273} 274 275/* Reading the proc file will show status (not the firmware contents) */ 276static ssize_t rtas_flash_read_msg(struct file *file, char __user *buf, 277 size_t count, loff_t *ppos) 278{ 279 struct rtas_update_flash_t *const uf = &rtas_update_flash_data; 280 char msg[RTAS_MSG_MAXLEN]; 281 size_t len; 282 int status; 283 284 mutex_lock(&rtas_update_flash_mutex); 285 status = uf->status; 286 mutex_unlock(&rtas_update_flash_mutex); 287 288 /* Read as text message */ 289 len = get_flash_status_msg(status, msg); 290 return simple_read_from_buffer(buf, count, ppos, msg, len); 291} 292 293static ssize_t rtas_flash_read_num(struct file *file, char __user *buf, 294 size_t count, loff_t *ppos) 295{ 296 struct rtas_update_flash_t *const uf = &rtas_update_flash_data; 297 char msg[RTAS_MSG_MAXLEN]; 298 int status; 299 300 mutex_lock(&rtas_update_flash_mutex); 301 status = uf->status; 302 mutex_unlock(&rtas_update_flash_mutex); 303 304 /* Read as number */ 305 sprintf(msg, "%d\n", status); 306 return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg)); 307} 308 309/* We could be much more efficient here. But to keep this function 310 * simple we allocate a page to the block list no matter how small the 311 * count is. If the system is low on memory it will be just as well 312 * that we fail.... 313 */ 314static ssize_t rtas_flash_write(struct file *file, const char __user *buffer, 315 size_t count, loff_t *off) 316{ 317 struct rtas_update_flash_t *const uf = &rtas_update_flash_data; 318 char *p; 319 int next_free, rc; 320 struct flash_block_list *fl; 321 322 mutex_lock(&rtas_update_flash_mutex); 323 324 if (uf->status == FLASH_AUTH || count == 0) 325 goto out; /* discard data */ 326 327 /* In the case that the image is not ready for flashing, the memory 328 * allocated for the block list will be freed upon the release of the 329 * proc file 330 */ 331 if (uf->flist == NULL) { 332 uf->flist = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); 333 if (!uf->flist) 334 goto nomem; 335 } 336 337 fl = uf->flist; 338 while (fl->next) 339 fl = fl->next; /* seek to last block_list for append */ 340 next_free = fl->num_blocks; 341 if (next_free == FLASH_BLOCKS_PER_NODE) { 342 /* Need to allocate another block_list */ 343 fl->next = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); 344 if (!fl->next) 345 goto nomem; 346 fl = fl->next; 347 next_free = 0; 348 } 349 350 if (count > RTAS_BLK_SIZE) 351 count = RTAS_BLK_SIZE; 352 p = kmem_cache_zalloc(flash_block_cache, GFP_KERNEL); 353 if (!p) 354 goto nomem; 355 356 if(copy_from_user(p, buffer, count)) { 357 kmem_cache_free(flash_block_cache, p); 358 rc = -EFAULT; 359 goto error; 360 } 361 fl->blocks[next_free].data = p; 362 fl->blocks[next_free].length = count; 363 fl->num_blocks++; 364out: 365 mutex_unlock(&rtas_update_flash_mutex); 366 return count; 367 368nomem: 369 rc = -ENOMEM; 370error: 371 mutex_unlock(&rtas_update_flash_mutex); 372 return rc; 373} 374 375/* 376 * Flash management routines. 377 */ 378static void manage_flash(struct rtas_manage_flash_t *args_buf, unsigned int op) 379{ 380 s32 rc; 381 382 do { 383 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 1, 384 NULL, op); 385 } while (rtas_busy_delay(rc)); 386 387 args_buf->status = rc; 388} 389 390static ssize_t manage_flash_read(struct file *file, char __user *buf, 391 size_t count, loff_t *ppos) 392{ 393 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; 394 char msg[RTAS_MSG_MAXLEN]; 395 int msglen, status; 396 397 mutex_lock(&rtas_manage_flash_mutex); 398 status = args_buf->status; 399 mutex_unlock(&rtas_manage_flash_mutex); 400 401 msglen = sprintf(msg, "%d\n", status); 402 return simple_read_from_buffer(buf, count, ppos, msg, msglen); 403} 404 405static ssize_t manage_flash_write(struct file *file, const char __user *buf, 406 size_t count, loff_t *off) 407{ 408 struct rtas_manage_flash_t *const args_buf = &rtas_manage_flash_data; 409 static const char reject_str[] = "0"; 410 static const char commit_str[] = "1"; 411 char stkbuf[10]; 412 int op, rc; 413 414 mutex_lock(&rtas_manage_flash_mutex); 415 416 if ((args_buf->status == MANAGE_AUTH) || (count == 0)) 417 goto out; 418 419 op = -1; 420 if (buf) { 421 if (count > 9) count = 9; 422 rc = -EFAULT; 423 if (copy_from_user (stkbuf, buf, count)) 424 goto error; 425 if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) 426 op = RTAS_REJECT_TMP_IMG; 427 else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) 428 op = RTAS_COMMIT_TMP_IMG; 429 } 430 431 if (op == -1) { /* buf is empty, or contains invalid string */ 432 rc = -EINVAL; 433 goto error; 434 } 435 436 manage_flash(args_buf, op); 437out: 438 mutex_unlock(&rtas_manage_flash_mutex); 439 return count; 440 441error: 442 mutex_unlock(&rtas_manage_flash_mutex); 443 return rc; 444} 445 446/* 447 * Validation routines. 448 */ 449static void validate_flash(struct rtas_validate_flash_t *args_buf) 450{ 451 int token = rtas_token("ibm,validate-flash-image"); 452 int update_results; 453 s32 rc; 454 455 rc = 0; 456 do { 457 spin_lock(&rtas_data_buf_lock); 458 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE); 459 rc = rtas_call(token, 2, 2, &update_results, 460 (u32) __pa(rtas_data_buf), args_buf->buf_size); 461 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE); 462 spin_unlock(&rtas_data_buf_lock); 463 } while (rtas_busy_delay(rc)); 464 465 args_buf->status = rc; 466 args_buf->update_results = update_results; 467} 468 469static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, 470 char *msg, int msglen) 471{ 472 int n; 473 474 if (args_buf->status >= VALIDATE_TMP_UPDATE) { 475 n = sprintf(msg, "%d\n", args_buf->update_results); 476 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) || 477 (args_buf->update_results == VALIDATE_TMP_UPDATE)) 478 n += snprintf(msg + n, msglen - n, "%s\n", 479 args_buf->buf); 480 } else { 481 n = sprintf(msg, "%d\n", args_buf->status); 482 } 483 return n; 484} 485 486static ssize_t validate_flash_read(struct file *file, char __user *buf, 487 size_t count, loff_t *ppos) 488{ 489 struct rtas_validate_flash_t *const args_buf = 490 &rtas_validate_flash_data; 491 char msg[VALIDATE_MSG_LEN]; 492 int msglen; 493 494 mutex_lock(&rtas_validate_flash_mutex); 495 msglen = get_validate_flash_msg(args_buf, msg, VALIDATE_MSG_LEN); 496 mutex_unlock(&rtas_validate_flash_mutex); 497 498 return simple_read_from_buffer(buf, count, ppos, msg, msglen); 499} 500 501static ssize_t validate_flash_write(struct file *file, const char __user *buf, 502 size_t count, loff_t *off) 503{ 504 struct rtas_validate_flash_t *const args_buf = 505 &rtas_validate_flash_data; 506 int rc; 507 508 mutex_lock(&rtas_validate_flash_mutex); 509 510 /* We are only interested in the first 4K of the 511 * candidate image */ 512 if ((*off >= VALIDATE_BUF_SIZE) || 513 (args_buf->status == VALIDATE_AUTH)) { 514 *off += count; 515 mutex_unlock(&rtas_validate_flash_mutex); 516 return count; 517 } 518 519 if (*off + count >= VALIDATE_BUF_SIZE) { 520 count = VALIDATE_BUF_SIZE - *off; 521 args_buf->status = VALIDATE_READY; 522 } else { 523 args_buf->status = VALIDATE_INCOMPLETE; 524 } 525 526 if (!access_ok(VERIFY_READ, buf, count)) { 527 rc = -EFAULT; 528 goto done; 529 } 530 if (copy_from_user(args_buf->buf + *off, buf, count)) { 531 rc = -EFAULT; 532 goto done; 533 } 534 535 *off += count; 536 rc = count; 537done: 538 mutex_unlock(&rtas_validate_flash_mutex); 539 return rc; 540} 541 542static int validate_flash_release(struct inode *inode, struct file *file) 543{ 544 struct rtas_validate_flash_t *const args_buf = 545 &rtas_validate_flash_data; 546 547 mutex_lock(&rtas_validate_flash_mutex); 548 549 if (args_buf->status == VALIDATE_READY) { 550 args_buf->buf_size = VALIDATE_BUF_SIZE; 551 validate_flash(args_buf); 552 } 553 554 mutex_unlock(&rtas_validate_flash_mutex); 555 return 0; 556} 557 558/* 559 * On-reboot flash update applicator. 560 */ 561static void rtas_flash_firmware(int reboot_type) 562{ 563 unsigned long image_size; 564 struct flash_block_list *f, *next, *flist; 565 unsigned long rtas_block_list; 566 int i, status, update_token; 567 568 if (rtas_firmware_flash_list == NULL) 569 return; /* nothing to do */ 570 571 if (reboot_type != SYS_RESTART) { 572 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n"); 573 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n"); 574 return; 575 } 576 577 update_token = rtas_token("ibm,update-flash-64-and-reboot"); 578 if (update_token == RTAS_UNKNOWN_SERVICE) { 579 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot " 580 "is not available -- not a service partition?\n"); 581 printk(KERN_ALERT "FLASH: firmware will not be flashed\n"); 582 return; 583 } 584 585 /* 586 * Just before starting the firmware flash, cancel the event scan work 587 * to avoid any soft lockup issues. 588 */ 589 rtas_cancel_event_scan(); 590 591 /* 592 * NOTE: the "first" block must be under 4GB, so we create 593 * an entry with no data blocks in the reserved buffer in 594 * the kernel data segment. 595 */ 596 spin_lock(&rtas_data_buf_lock); 597 flist = (struct flash_block_list *)&rtas_data_buf[0]; 598 flist->num_blocks = 0; 599 flist->next = rtas_firmware_flash_list; 600 rtas_block_list = __pa(flist); 601 if (rtas_block_list >= 4UL*1024*1024*1024) { 602 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n"); 603 spin_unlock(&rtas_data_buf_lock); 604 return; 605 } 606 607 printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n"); 608 /* Update the block_list in place. */ 609 rtas_firmware_flash_list = NULL; /* too hard to backout on error */ 610 image_size = 0; 611 for (f = flist; f; f = next) { 612 /* Translate data addrs to absolute */ 613 for (i = 0; i < f->num_blocks; i++) { 614 f->blocks[i].data = (char *)cpu_to_be64(__pa(f->blocks[i].data)); 615 image_size += f->blocks[i].length; 616 f->blocks[i].length = cpu_to_be64(f->blocks[i].length); 617 } 618 next = f->next; 619 /* Don't translate NULL pointer for last entry */ 620 if (f->next) 621 f->next = (struct flash_block_list *)cpu_to_be64(__pa(f->next)); 622 else 623 f->next = NULL; 624 /* make num_blocks into the version/length field */ 625 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16); 626 f->num_blocks = cpu_to_be64(f->num_blocks); 627 } 628 629 printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size); 630 printk(KERN_ALERT "FLASH: performing flash and reboot\n"); 631 rtas_progress("Flashing \n", 0x0); 632 rtas_progress("Please Wait... ", 0x0); 633 printk(KERN_ALERT "FLASH: this will take several minutes. Do not power off!\n"); 634 status = rtas_call(update_token, 1, 1, NULL, rtas_block_list); 635 switch (status) { /* should only get "bad" status */ 636 case 0: 637 printk(KERN_ALERT "FLASH: success\n"); 638 break; 639 case -1: 640 printk(KERN_ALERT "FLASH: hardware error. Firmware may not be not flashed\n"); 641 break; 642 case -3: 643 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform. Firmware not flashed\n"); 644 break; 645 case -4: 646 printk(KERN_ALERT "FLASH: flash failed when partially complete. System may not reboot\n"); 647 break; 648 default: 649 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status); 650 break; 651 } 652 spin_unlock(&rtas_data_buf_lock); 653} 654 655/* 656 * Manifest of proc files to create 657 */ 658struct rtas_flash_file { 659 const char *filename; 660 const char *rtas_call_name; 661 int *status; 662 const struct file_operations fops; 663}; 664 665static const struct rtas_flash_file rtas_flash_files[] = { 666 { 667 .filename = "powerpc/rtas/" FIRMWARE_FLASH_NAME, 668 .rtas_call_name = "ibm,update-flash-64-and-reboot", 669 .status = &rtas_update_flash_data.status, 670 .fops.read = rtas_flash_read_msg, 671 .fops.write = rtas_flash_write, 672 .fops.release = rtas_flash_release, 673 .fops.llseek = default_llseek, 674 }, 675 { 676 .filename = "powerpc/rtas/" FIRMWARE_UPDATE_NAME, 677 .rtas_call_name = "ibm,update-flash-64-and-reboot", 678 .status = &rtas_update_flash_data.status, 679 .fops.read = rtas_flash_read_num, 680 .fops.write = rtas_flash_write, 681 .fops.release = rtas_flash_release, 682 .fops.llseek = default_llseek, 683 }, 684 { 685 .filename = "powerpc/rtas/" VALIDATE_FLASH_NAME, 686 .rtas_call_name = "ibm,validate-flash-image", 687 .status = &rtas_validate_flash_data.status, 688 .fops.read = validate_flash_read, 689 .fops.write = validate_flash_write, 690 .fops.release = validate_flash_release, 691 .fops.llseek = default_llseek, 692 }, 693 { 694 .filename = "powerpc/rtas/" MANAGE_FLASH_NAME, 695 .rtas_call_name = "ibm,manage-flash-image", 696 .status = &rtas_manage_flash_data.status, 697 .fops.read = manage_flash_read, 698 .fops.write = manage_flash_write, 699 .fops.llseek = default_llseek, 700 } 701}; 702 703static int __init rtas_flash_init(void) 704{ 705 int i; 706 707 if (rtas_token("ibm,update-flash-64-and-reboot") == 708 RTAS_UNKNOWN_SERVICE) { 709 pr_info("rtas_flash: no firmware flash support\n"); 710 return -EINVAL; 711 } 712 713 rtas_validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL); 714 if (!rtas_validate_flash_data.buf) 715 return -ENOMEM; 716 717 flash_block_cache = kmem_cache_create("rtas_flash_cache", 718 RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0, 719 NULL); 720 if (!flash_block_cache) { 721 printk(KERN_ERR "%s: failed to create block cache\n", 722 __func__); 723 goto enomem_buf; 724 } 725 726 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { 727 const struct rtas_flash_file *f = &rtas_flash_files[i]; 728 int token; 729 730 if (!proc_create(f->filename, S_IRUSR | S_IWUSR, NULL, &f->fops)) 731 goto enomem; 732 733 /* 734 * This code assumes that the status int is the first member of the 735 * struct 736 */ 737 token = rtas_token(f->rtas_call_name); 738 if (token == RTAS_UNKNOWN_SERVICE) 739 *f->status = FLASH_AUTH; 740 else 741 *f->status = FLASH_NO_OP; 742 } 743 744 rtas_flash_term_hook = rtas_flash_firmware; 745 return 0; 746 747enomem: 748 while (--i >= 0) { 749 const struct rtas_flash_file *f = &rtas_flash_files[i]; 750 remove_proc_entry(f->filename, NULL); 751 } 752 753 kmem_cache_destroy(flash_block_cache); 754enomem_buf: 755 kfree(rtas_validate_flash_data.buf); 756 return -ENOMEM; 757} 758 759static void __exit rtas_flash_cleanup(void) 760{ 761 int i; 762 763 rtas_flash_term_hook = NULL; 764 765 if (rtas_firmware_flash_list) { 766 free_flash_list(rtas_firmware_flash_list); 767 rtas_firmware_flash_list = NULL; 768 } 769 770 for (i = 0; i < ARRAY_SIZE(rtas_flash_files); i++) { 771 const struct rtas_flash_file *f = &rtas_flash_files[i]; 772 remove_proc_entry(f->filename, NULL); 773 } 774 775 kmem_cache_destroy(flash_block_cache); 776 kfree(rtas_validate_flash_data.buf); 777} 778 779module_init(rtas_flash_init); 780module_exit(rtas_flash_cleanup); 781MODULE_LICENSE("GPL"); 782