arch/powerpc/kernel/rtas_flash.c

   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 <asm/delay.h>
  21 #include <asm/uaccess.h>
  22 #include <asm/rtas.h>
  23 #include <asm/abs_addr.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 #define VALIDATE_TMP_UPDATE    0     /* Validate Return Status */
  61 #define VALIDATE_FLASH_AUTH    1     /* Validate Return Status */
  62 #define VALIDATE_INVALID_IMG   2     /* Validate Return Status */
  63 #define VALIDATE_CUR_UNKNOWN   3     /* Validate Return Status */
  64 #define VALIDATE_TMP_COMMIT_DL 4     /* Validate Return Status */
  65 #define VALIDATE_TMP_COMMIT    5     /* Validate Return Status */
  66 #define VALIDATE_TMP_UPDATE_DL 6     /* Validate Return Status */
  67
  68 /* ibm,manage-flash-image operation tokens */
  69 #define RTAS_REJECT_TMP_IMG   0
  70 #define RTAS_COMMIT_TMP_IMG   1
  71
  72 /* Array sizes */
  73 #define VALIDATE_BUF_SIZE 4096
  74 #define RTAS_MSG_MAXLEN   64
  75
  76 /* Quirk - RTAS requires 4k list length and block size */
  77 #define RTAS_BLKLIST_LENGTH 4096
  78 #define RTAS_BLK_SIZE 4096
  79
  80 struct flash_block {
  81         char *data;
  82         unsigned long length;
  83 };
  84
  85 /* This struct is very similar but not identical to
  86  * that needed by the rtas flash update.
  87  * All we need to do for rtas is rewrite num_blocks
  88  * into a version/length and translate the pointers
  89  * to absolute.
  90  */
  91 #define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
  92 struct flash_block_list {
  93         unsigned long num_blocks;
  94         struct flash_block_list *next;
  95         struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
  96 };
  97
  98 static struct flash_block_list *rtas_firmware_flash_list;
  99
 100 /* Use slab cache to guarantee 4k alignment */
 101 static struct kmem_cache *flash_block_cache = NULL;
 102
 103 #define FLASH_BLOCK_LIST_VERSION (1UL)
 104
 105 /* Local copy of the flash block list.
 106  * We only allow one open of the flash proc file and create this
 107  * list as we go.  The rtas_firmware_flash_list varable will be
 108  * set once the data is fully read.
 109  *
 110  * For convenience as we build the list we use virtual addrs,
 111  * we do not fill in the version number, and the length field
 112  * is treated as the number of entries currently in the block
 113  * (i.e. not a byte count).  This is all fixed when calling
 114  * the flash routine.
 115  */
 116
 117 /* Status int must be first member of struct */
 118 struct rtas_update_flash_t
 119 {
 120         int status;                     /* Flash update status */
 121         struct flash_block_list *flist; /* Local copy of flash block list */
 122 };
 123
 124 /* Status int must be first member of struct */
 125 struct rtas_manage_flash_t
 126 {
 127         int status;                     /* Returned status */
 128         unsigned int op;                /* Reject or commit image */
 129 };
 130
 131 /* Status int must be first member of struct */
 132 struct rtas_validate_flash_t
 133 {
 134         int status;                     /* Returned status */
 135         char buf[VALIDATE_BUF_SIZE];    /* Candidate image buffer */
 136         unsigned int buf_size;          /* Size of image buf */
 137         unsigned int update_results;    /* Update results token */
 138 };
 139
 140 static DEFINE_SPINLOCK(flash_file_open_lock);
 141 static struct proc_dir_entry *firmware_flash_pde;
 142 static struct proc_dir_entry *firmware_update_pde;
 143 static struct proc_dir_entry *validate_pde;
 144 static struct proc_dir_entry *manage_pde;
 145
 146 /* Do simple sanity checks on the flash image. */
 147 static int flash_list_valid(struct flash_block_list *flist)
 148 {
 149         struct flash_block_list *f;
 150         int i;
 151         unsigned long block_size, image_size;
 152
 153         /* Paranoid self test here.  We also collect the image size. */
 154         image_size = 0;
 155         for (f = flist; f; f = f->next) {
 156                 for (i = 0; i < f->num_blocks; i++) {
 157                         if (f->blocks[i].data == NULL) {
 158                                 return FLASH_IMG_NULL_DATA;
 159                         }
 160                         block_size = f->blocks[i].length;
 161                         if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
 162                                 return FLASH_IMG_BAD_LEN;
 163                         }
 164                         image_size += block_size;
 165                 }
 166         }
 167
 168         if (image_size < (256 << 10)) {
 169                 if (image_size < 2)
 170                         return FLASH_NO_OP;
 171         }
 172
 173         printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);
 174
 175         return FLASH_IMG_READY;
 176 }
 177
 178 static void free_flash_list(struct flash_block_list *f)
 179 {
 180         struct flash_block_list *next;
 181         int i;
 182
 183         while (f) {
 184                 for (i = 0; i < f->num_blocks; i++)
 185                         kmem_cache_free(flash_block_cache, f->blocks[i].data);
 186                 next = f->next;
 187                 kmem_cache_free(flash_block_cache, f);
 188                 f = next;
 189         }
 190 }
 191
 192 static int rtas_flash_release(struct inode *inode, struct file *file)
 193 {
 194         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 195         struct rtas_update_flash_t *uf;
 196
 197         uf = (struct rtas_update_flash_t *) dp->data;
 198         if (uf->flist) {
 199                 /* File was opened in write mode for a new flash attempt */
 200                 /* Clear saved list */
 201                 if (rtas_firmware_flash_list) {
 202                         free_flash_list(rtas_firmware_flash_list);
 203                         rtas_firmware_flash_list = NULL;
 204                 }
 205
 206                 if (uf->status != FLASH_AUTH)
 207                         uf->status = flash_list_valid(uf->flist);
 208
 209                 if (uf->status == FLASH_IMG_READY)
 210                         rtas_firmware_flash_list = uf->flist;
 211                 else
 212                         free_flash_list(uf->flist);
 213
 214                 uf->flist = NULL;
 215         }
 216
 217         atomic_dec(&dp->count);
 218         return 0;
 219 }
 220
 221 static void get_flash_status_msg(int status, char *buf)
 222 {
 223         char *msg;
 224
 225         switch (status) {
 226         case FLASH_AUTH:
 227                 msg = "error: this partition does not have service authority\n";
 228                 break;
 229         case FLASH_NO_OP:
 230                 msg = "info: no firmware image for flash\n";
 231                 break;
 232         case FLASH_IMG_SHORT:
 233                 msg = "error: flash image short\n";
 234                 break;
 235         case FLASH_IMG_BAD_LEN:
 236                 msg = "error: internal error bad length\n";
 237                 break;
 238         case FLASH_IMG_NULL_DATA:
 239                 msg = "error: internal error null data\n";
 240                 break;
 241         case FLASH_IMG_READY:
 242                 msg = "ready: firmware image ready for flash on reboot\n";
 243                 break;
 244         default:
 245                 sprintf(buf, "error: unexpected status value %d\n", status);
 246                 return;
 247         }
 248
 249         strcpy(buf, msg);
 250 }
 251
 252 /* Reading the proc file will show status (not the firmware contents) */
 253 static ssize_t rtas_flash_read(struct file *file, char __user *buf,
 254                                size_t count, loff_t *ppos)
 255 {
 256         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 257         struct rtas_update_flash_t *uf;
 258         char msg[RTAS_MSG_MAXLEN];
 259
 260         uf = dp->data;
 261
 262         if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) {
 263                 get_flash_status_msg(uf->status, msg);
 264         } else {           /* FIRMWARE_UPDATE_NAME */
 265                 sprintf(msg, "%d\n", uf->status);
 266         }
 267
 268         return simple_read_from_buffer(buf, count, ppos, msg, strlen(msg));
 269 }
 270
 271 /* constructor for flash_block_cache */
 272 void rtas_block_ctor(void *ptr)
 273 {
 274         memset(ptr, 0, RTAS_BLK_SIZE);
 275 }
 276
 277 /* We could be much more efficient here.  But to keep this function
 278  * simple we allocate a page to the block list no matter how small the
 279  * count is.  If the system is low on memory it will be just as well
 280  * that we fail....
 281  */
 282 static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
 283                                 size_t count, loff_t *off)
 284 {
 285         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 286         struct rtas_update_flash_t *uf;
 287         char *p;
 288         int next_free;
 289         struct flash_block_list *fl;
 290
 291         uf = (struct rtas_update_flash_t *) dp->data;
 292
 293         if (uf->status == FLASH_AUTH || count == 0)
 294                 return count;   /* discard data */
 295
 296         /* In the case that the image is not ready for flashing, the memory
 297          * allocated for the block list will be freed upon the release of the
 298          * proc file
 299          */
 300         if (uf->flist == NULL) {
 301                 uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
 302                 if (!uf->flist)
 303                         return -ENOMEM;
 304         }
 305
 306         fl = uf->flist;
 307         while (fl->next)
 308                 fl = fl->next; /* seek to last block_list for append */
 309         next_free = fl->num_blocks;
 310         if (next_free == FLASH_BLOCKS_PER_NODE) {
 311                 /* Need to allocate another block_list */
 312                 fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
 313                 if (!fl->next)
 314                         return -ENOMEM;
 315                 fl = fl->next;
 316                 next_free = 0;
 317         }
 318
 319         if (count > RTAS_BLK_SIZE)
 320                 count = RTAS_BLK_SIZE;
 321         p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
 322         if (!p)
 323                 return -ENOMEM;
 324
 325         if(copy_from_user(p, buffer, count)) {
 326                 kmem_cache_free(flash_block_cache, p);
 327                 return -EFAULT;
 328         }
 329         fl->blocks[next_free].data = p;
 330         fl->blocks[next_free].length = count;
 331         fl->num_blocks++;
 332
 333         return count;
 334 }
 335
 336 static int rtas_excl_open(struct inode *inode, struct file *file)
 337 {
 338         struct proc_dir_entry *dp = PDE(inode);
 339
 340         /* Enforce exclusive open with use count of PDE */
 341         spin_lock(&flash_file_open_lock);
 342         if (atomic_read(&dp->count) > 2) {
 343                 spin_unlock(&flash_file_open_lock);
 344                 return -EBUSY;
 345         }
 346
 347         atomic_inc(&dp->count);
 348         spin_unlock(&flash_file_open_lock);
 349
 350         return 0;
 351 }
 352
 353 static int rtas_excl_release(struct inode *inode, struct file *file)
 354 {
 355         struct proc_dir_entry *dp = PDE(inode);
 356
 357         atomic_dec(&dp->count);
 358
 359         return 0;
 360 }
 361
 362 static void manage_flash(struct rtas_manage_flash_t *args_buf)
 363 {
 364         s32 rc;
 365
 366         do {
 367                 rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1,
 368                                1, NULL, args_buf->op);
 369         } while (rtas_busy_delay(rc));
 370
 371         args_buf->status = rc;
 372 }
 373
 374 static ssize_t manage_flash_read(struct file *file, char __user *buf,
 375                                size_t count, loff_t *ppos)
 376 {
 377         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 378         struct rtas_manage_flash_t *args_buf;
 379         char msg[RTAS_MSG_MAXLEN];
 380         int msglen;
 381
 382         args_buf = dp->data;
 383         if (args_buf == NULL)
 384                 return 0;
 385
 386         msglen = sprintf(msg, "%d\n", args_buf->status);
 387
 388         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
 389 }
 390
 391 static ssize_t manage_flash_write(struct file *file, const char __user *buf,
 392                                 size_t count, loff_t *off)
 393 {
 394         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 395         struct rtas_manage_flash_t *args_buf;
 396         const char reject_str[] = "0";
 397         const char commit_str[] = "1";
 398         char stkbuf[10];
 399         int op;
 400
 401         args_buf = (struct rtas_manage_flash_t *) dp->data;
 402         if ((args_buf->status == MANAGE_AUTH) || (count == 0))
 403                 return count;
 404
 405         op = -1;
 406         if (buf) {
 407                 if (count > 9) count = 9;
 408                 if (copy_from_user (stkbuf, buf, count)) {
 409                         return -EFAULT;
 410                 }
 411                 if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0)
 412                         op = RTAS_REJECT_TMP_IMG;
 413                 else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0)
 414                         op = RTAS_COMMIT_TMP_IMG;
 415         }
 416
 417         if (op == -1)   /* buf is empty, or contains invalid string */
 418                 return -EINVAL;
 419
 420         args_buf->op = op;
 421         manage_flash(args_buf);
 422
 423         return count;
 424 }
 425
 426 static void validate_flash(struct rtas_validate_flash_t *args_buf)
 427 {
 428         int token = rtas_token("ibm,validate-flash-image");
 429         int update_results;
 430         s32 rc;
 431
 432         rc = 0;
 433         do {
 434                 spin_lock(&rtas_data_buf_lock);
 435                 memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
 436                 rc = rtas_call(token, 2, 2, &update_results,
 437                                (u32) __pa(rtas_data_buf), args_buf->buf_size);
 438                 memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
 439                 spin_unlock(&rtas_data_buf_lock);
 440         } while (rtas_busy_delay(rc));
 441
 442         args_buf->status = rc;
 443         args_buf->update_results = update_results;
 444 }
 445
 446 static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf,
 447                                    char *msg)
 448 {
 449         int n;
 450
 451         if (args_buf->status >= VALIDATE_TMP_UPDATE) {
 452                 n = sprintf(msg, "%d\n", args_buf->update_results);
 453                 if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
 454                     (args_buf->update_results == VALIDATE_TMP_UPDATE))
 455                         n += sprintf(msg + n, "%s\n", args_buf->buf);
 456         } else {
 457                 n = sprintf(msg, "%d\n", args_buf->status);
 458         }
 459         return n;
 460 }
 461
 462 static ssize_t validate_flash_read(struct file *file, char __user *buf,
 463                                size_t count, loff_t *ppos)
 464 {
 465         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 466         struct rtas_validate_flash_t *args_buf;
 467         char msg[RTAS_MSG_MAXLEN];
 468         int msglen;
 469
 470         args_buf = dp->data;
 471
 472         msglen = get_validate_flash_msg(args_buf, msg);
 473
 474         return simple_read_from_buffer(buf, count, ppos, msg, msglen);
 475 }
 476
 477 static ssize_t validate_flash_write(struct file *file, const char __user *buf,
 478                                     size_t count, loff_t *off)
 479 {
 480         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 481         struct rtas_validate_flash_t *args_buf;
 482         int rc;
 483
 484         args_buf = (struct rtas_validate_flash_t *) dp->data;
 485
 486         if (dp->data == NULL) {
 487                 dp->data = kmalloc(sizeof(struct rtas_validate_flash_t),
 488                                 GFP_KERNEL);
 489                 if (dp->data == NULL)
 490                         return -ENOMEM;
 491         }
 492
 493         /* We are only interested in the first 4K of the
 494          * candidate image */
 495         if ((*off >= VALIDATE_BUF_SIZE) ||
 496                 (args_buf->status == VALIDATE_AUTH)) {
 497                 *off += count;
 498                 return count;
 499         }
 500
 501         if (*off + count >= VALIDATE_BUF_SIZE)  {
 502                 count = VALIDATE_BUF_SIZE - *off;
 503                 args_buf->status = VALIDATE_READY;
 504         } else {
 505                 args_buf->status = VALIDATE_INCOMPLETE;
 506         }
 507
 508         if (!access_ok(VERIFY_READ, buf, count)) {
 509                 rc = -EFAULT;
 510                 goto done;
 511         }
 512         if (copy_from_user(args_buf->buf + *off, buf, count)) {
 513                 rc = -EFAULT;
 514                 goto done;
 515         }
 516
 517         *off += count;
 518         rc = count;
 519 done:
 520         if (rc < 0) {
 521                 kfree(dp->data);
 522                 dp->data = NULL;
 523         }
 524         return rc;
 525 }
 526
 527 static int validate_flash_release(struct inode *inode, struct file *file)
 528 {
 529         struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
 530         struct rtas_validate_flash_t *args_buf;
 531
 532         args_buf = (struct rtas_validate_flash_t *) dp->data;
 533
 534         if (args_buf->status == VALIDATE_READY) {
 535                 args_buf->buf_size = VALIDATE_BUF_SIZE;
 536                 validate_flash(args_buf);
 537         }
 538
 539         /* The matching atomic_inc was in rtas_excl_open() */
 540         atomic_dec(&dp->count);
 541
 542         return 0;
 543 }
 544
 545 static void rtas_flash_firmware(int reboot_type)
 546 {
 547         unsigned long image_size;
 548         struct flash_block_list *f, *next, *flist;
 549         unsigned long rtas_block_list;
 550         int i, status, update_token;
 551
 552         if (rtas_firmware_flash_list == NULL)
 553                 return;         /* nothing to do */
 554
 555         if (reboot_type != SYS_RESTART) {
 556                 printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
 557                 printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
 558                 return;
 559         }
 560
 561         update_token = rtas_token("ibm,update-flash-64-and-reboot");
 562         if (update_token == RTAS_UNKNOWN_SERVICE) {
 563                 printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
 564                        "is not available -- not a service partition?\n");
 565                 printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
 566                 return;
 567         }
 568
 569         /*
 570          * NOTE: the "first" block must be under 4GB, so we create
 571          * an entry with no data blocks in the reserved buffer in
 572          * the kernel data segment.
 573          */
 574         spin_lock(&rtas_data_buf_lock);
 575         flist = (struct flash_block_list *)&rtas_data_buf[0];
 576         flist->num_blocks = 0;
 577         flist->next = rtas_firmware_flash_list;
 578         rtas_block_list = virt_to_abs(flist);
 579         if (rtas_block_list >= 4UL*1024*1024*1024) {
 580                 printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
 581                 spin_unlock(&rtas_data_buf_lock);
 582                 return;
 583         }
 584
 585         printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
 586         /* Update the block_list in place. */
 587         rtas_firmware_flash_list = NULL; /* too hard to backout on error */
 588         image_size = 0;
 589         for (f = flist; f; f = next) {
 590                 /* Translate data addrs to absolute */
 591                 for (i = 0; i < f->num_blocks; i++) {
 592                         f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
 593                         image_size += f->blocks[i].length;
 594                 }
 595                 next = f->next;
 596                 /* Don't translate NULL pointer for last entry */
 597                 if (f->next)
 598                         f->next = (struct flash_block_list *)virt_to_abs(f->next);
 599                 else
 600                         f->next = NULL;
 601                 /* make num_blocks into the version/length field */
 602                 f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
 603         }
 604
 605         printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
 606         printk(KERN_ALERT "FLASH: performing flash and reboot\n");
 607         rtas_progress("Flashing        \n", 0x0);
 608         rtas_progress("Please Wait...  ", 0x0);
 609         printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
 610         status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
 611         switch (status) {       /* should only get "bad" status */
 612             case 0:
 613                 printk(KERN_ALERT "FLASH: success\n");
 614                 break;
 615             case -1:
 616                 printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
 617                 break;
 618             case -3:
 619                 printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
 620                 break;
 621             case -4:
 622                 printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
 623                 break;
 624             default:
 625                 printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
 626                 break;
 627         }
 628         spin_unlock(&rtas_data_buf_lock);
 629 }
 630
 631 static void remove_flash_pde(struct proc_dir_entry *dp)
 632 {
 633         if (dp) {
 634                 kfree(dp->data);
 635                 remove_proc_entry(dp->name, dp->parent);
 636         }
 637 }
 638
 639 static int initialize_flash_pde_data(const char *rtas_call_name,
 640                                      size_t buf_size,
 641                                      struct proc_dir_entry *dp)
 642 {
 643         int *status;
 644         int token;
 645
 646         dp->data = kzalloc(buf_size, GFP_KERNEL);
 647         if (dp->data == NULL) {
 648                 remove_flash_pde(dp);
 649                 return -ENOMEM;
 650         }
 651
 652         /*
 653          * This code assumes that the status int is the first member of the
 654          * struct
 655          */
 656         status = (int *) dp->data;
 657         token = rtas_token(rtas_call_name);
 658         if (token == RTAS_UNKNOWN_SERVICE)
 659                 *status = FLASH_AUTH;
 660         else
 661                 *status = FLASH_NO_OP;
 662
 663         return 0;
 664 }
 665
 666 static struct proc_dir_entry *create_flash_pde(const char *filename,
 667                                                const struct file_operations *fops)
 668 {
 669         return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops);
 670 }
 671
 672 static const struct file_operations rtas_flash_operations = {
 673         .owner          = THIS_MODULE,
 674         .read           = rtas_flash_read,
 675         .write          = rtas_flash_write,
 676         .open           = rtas_excl_open,
 677         .release        = rtas_flash_release,
 678         .llseek         = default_llseek,
 679 };
 680
 681 static const struct file_operations manage_flash_operations = {
 682         .owner          = THIS_MODULE,
 683         .read           = manage_flash_read,
 684         .write          = manage_flash_write,
 685         .open           = rtas_excl_open,
 686         .release        = rtas_excl_release,
 687         .llseek         = default_llseek,
 688 };
 689
 690 static const struct file_operations validate_flash_operations = {
 691         .owner          = THIS_MODULE,
 692         .read           = validate_flash_read,
 693         .write          = validate_flash_write,
 694         .open           = rtas_excl_open,
 695         .release        = validate_flash_release,
 696         .llseek         = default_llseek,
 697 };
 698
 699 static int __init rtas_flash_init(void)
 700 {
 701         int rc;
 702
 703         if (rtas_token("ibm,update-flash-64-and-reboot") ==
 704                        RTAS_UNKNOWN_SERVICE) {
 705                 printk(KERN_ERR "rtas_flash: no firmware flash support\n");
 706                 return 1;
 707         }
 708
 709         firmware_flash_pde = create_flash_pde("powerpc/rtas/"
 710                                               FIRMWARE_FLASH_NAME,
 711                                               &rtas_flash_operations);
 712         if (firmware_flash_pde == NULL) {
 713                 rc = -ENOMEM;
 714                 goto cleanup;
 715         }
 716
 717         rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
 718                                        sizeof(struct rtas_update_flash_t),
 719                                        firmware_flash_pde);
 720         if (rc != 0)
 721                 goto cleanup;
 722
 723         firmware_update_pde = create_flash_pde("powerpc/rtas/"
 724                                                FIRMWARE_UPDATE_NAME,
 725                                                &rtas_flash_operations);
 726         if (firmware_update_pde == NULL) {
 727                 rc = -ENOMEM;
 728                 goto cleanup;
 729         }
 730
 731         rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
 732                                        sizeof(struct rtas_update_flash_t),
 733                                        firmware_update_pde);
 734         if (rc != 0)
 735                 goto cleanup;
 736
 737         validate_pde = create_flash_pde("powerpc/rtas/" VALIDATE_FLASH_NAME,
 738                                         &validate_flash_operations);
 739         if (validate_pde == NULL) {
 740                 rc = -ENOMEM;
 741                 goto cleanup;
 742         }
 743
 744         rc = initialize_flash_pde_data("ibm,validate-flash-image",
 745                                        sizeof(struct rtas_validate_flash_t),
 746                                        validate_pde);
 747         if (rc != 0)
 748                 goto cleanup;
 749
 750         manage_pde = create_flash_pde("powerpc/rtas/" MANAGE_FLASH_NAME,
 751                                       &manage_flash_operations);
 752         if (manage_pde == NULL) {
 753                 rc = -ENOMEM;
 754                 goto cleanup;
 755         }
 756
 757         rc = initialize_flash_pde_data("ibm,manage-flash-image",
 758                                        sizeof(struct rtas_manage_flash_t),
 759                                        manage_pde);
 760         if (rc != 0)
 761                 goto cleanup;
 762
 763         rtas_flash_term_hook = rtas_flash_firmware;
 764
 765         flash_block_cache = kmem_cache_create("rtas_flash_cache",
 766                                 RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
 767                                 rtas_block_ctor);
 768         if (!flash_block_cache) {
 769                 printk(KERN_ERR "%s: failed to create block cache\n",
 770                                 __func__);
 771                 rc = -ENOMEM;
 772                 goto cleanup;
 773         }
 774         return 0;
 775
 776 cleanup:
 777         remove_flash_pde(firmware_flash_pde);
 778         remove_flash_pde(firmware_update_pde);
 779         remove_flash_pde(validate_pde);
 780         remove_flash_pde(manage_pde);
 781
 782         return rc;
 783 }
 784
 785 static void __exit rtas_flash_cleanup(void)
 786 {
 787         rtas_flash_term_hook = NULL;
 788
 789         if (flash_block_cache)
 790                 kmem_cache_destroy(flash_block_cache);
 791
 792         remove_flash_pde(firmware_flash_pde);
 793         remove_flash_pde(firmware_update_pde);
 794         remove_flash_pde(validate_pde);
 795         remove_flash_pde(manage_pde);
 796 }
 797
 798 module_init(rtas_flash_init);
 799 module_exit(rtas_flash_cleanup);
 800 MODULE_LICENSE("GPL");