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rtas_flash.c

/*
 *  c 2001 PPC 64 Team, IBM Corp
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 * /proc/ppc64/rtas/firmware_flash interface
 *
 * This file implements a firmware_flash interface to pump a firmware
 * image into the kernel.  At reboot time rtas_restart() will see the
 * firmware image and flash it as it reboots (see rtas.c).
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <asm/delay.h>
#include <asm/uaccess.h>
#include <asm/rtas.h>
#include <asm/abs_addr.h>

#define MODULE_VERS "1.0"
#define MODULE_NAME "rtas_flash"

#define FIRMWARE_FLASH_NAME "firmware_flash"   
#define FIRMWARE_UPDATE_NAME "firmware_update"
#define MANAGE_FLASH_NAME "manage_flash"
#define VALIDATE_FLASH_NAME "validate_flash"

/* General RTAS Status Codes */
#define RTAS_RC_SUCCESS  0
#define RTAS_RC_HW_ERR  -1
#define RTAS_RC_BUSY    -2

/* Flash image status values */
#define FLASH_AUTH           -9002 /* RTAS Not Service Authority Partition */
#define FLASH_NO_OP          -1099 /* No operation initiated by user */ 
#define FLASH_IMG_SHORT      -1005 /* Flash image shorter than expected */
#define FLASH_IMG_BAD_LEN    -1004 /* Bad length value in flash list block */
#define FLASH_IMG_NULL_DATA  -1003 /* Bad data value in flash list block */
#define FLASH_IMG_READY      0     /* Firmware img ready for flash on reboot */

/* Manage image status values */
#define MANAGE_AUTH          -9002 /* RTAS Not Service Authority Partition */
#define MANAGE_ACTIVE_ERR    -9001 /* RTAS Cannot Overwrite Active Img */
#define MANAGE_NO_OP         -1099 /* No operation initiated by user */
#define MANAGE_PARAM_ERR     -3    /* RTAS Parameter Error */
#define MANAGE_HW_ERR        -1    /* RTAS Hardware Error */

/* Validate image status values */
#define VALIDATE_AUTH          -9002 /* RTAS Not Service Authority Partition */
#define VALIDATE_NO_OP         -1099 /* No operation initiated by the user */
#define VALIDATE_INCOMPLETE    -1002 /* User copied < VALIDATE_BUF_SIZE */
#define VALIDATE_READY         -1001 /* Firmware image ready for validation */
#define VALIDATE_PARAM_ERR     -3    /* RTAS Parameter Error */
#define VALIDATE_HW_ERR        -1    /* RTAS Hardware Error */
#define VALIDATE_TMP_UPDATE    0     /* Validate Return Status */
#define VALIDATE_FLASH_AUTH    1     /* Validate Return Status */
#define VALIDATE_INVALID_IMG   2     /* Validate Return Status */
#define VALIDATE_CUR_UNKNOWN   3     /* Validate Return Status */
#define VALIDATE_TMP_COMMIT_DL 4     /* Validate Return Status */
#define VALIDATE_TMP_COMMIT    5     /* Validate Return Status */
#define VALIDATE_TMP_UPDATE_DL 6     /* Validate Return Status */

/* ibm,manage-flash-image operation tokens */
#define RTAS_REJECT_TMP_IMG   0
#define RTAS_COMMIT_TMP_IMG   1

/* Array sizes */
#define VALIDATE_BUF_SIZE 4096    
#define RTAS_MSG_MAXLEN   64

/* Quirk - RTAS requires 4k list length and block size */
#define RTAS_BLKLIST_LENGTH 4096
#define RTAS_BLK_SIZE 4096

00079 struct flash_block {
      char *data;
      unsigned long length;
};

/* This struct is very similar but not identical to
 * that needed by the rtas flash update.
 * All we need to do for rtas is rewrite num_blocks
 * into a version/length and translate the pointers
 * to absolute.
 */
#define FLASH_BLOCKS_PER_NODE ((RTAS_BLKLIST_LENGTH - 16) / sizeof(struct flash_block))
00091 struct flash_block_list {
      unsigned long num_blocks;
      struct flash_block_list *next;
      struct flash_block blocks[FLASH_BLOCKS_PER_NODE];
};
00096 struct flash_block_list_header { /* just the header of flash_block_list */
      unsigned long num_blocks;
      struct flash_block_list *next;
};

static struct flash_block_list_header rtas_firmware_flash_list = {0, NULL};

/* Use slab cache to guarantee 4k alignment */
static struct kmem_cache *flash_block_cache = NULL;

#define FLASH_BLOCK_LIST_VERSION (1UL)

/* Local copy of the flash block list.
 * We only allow one open of the flash proc file and create this
 * list as we go.  This list will be put in the
 * rtas_firmware_flash_list var once it is fully read.
 *
 * For convenience as we build the list we use virtual addrs,
 * we do not fill in the version number, and the length field
 * is treated as the number of entries currently in the block
 * (i.e. not a byte count).  This is all fixed on release.
 */

/* Status int must be first member of struct */
00120 struct rtas_update_flash_t
{
      int status;             /* Flash update status */
      struct flash_block_list *flist; /* Local copy of flash block list */
};

/* Status int must be first member of struct */
00127 struct rtas_manage_flash_t
{
      int status;             /* Returned status */
      unsigned int op;        /* Reject or commit image */
};

/* Status int must be first member of struct */
00134 struct rtas_validate_flash_t
{
      int status;             /* Returned status */   
      char buf[VALIDATE_BUF_SIZE];  /* Candidate image buffer */
      unsigned int buf_size;        /* Size of image buf */
      unsigned int update_results;  /* Update results token */
};

static DEFINE_SPINLOCK(flash_file_open_lock);
static struct proc_dir_entry *firmware_flash_pde;
static struct proc_dir_entry *firmware_update_pde;
static struct proc_dir_entry *validate_pde;
static struct proc_dir_entry *manage_pde;

/* Do simple sanity checks on the flash image. */
static int flash_list_valid(struct flash_block_list *flist)
{
      struct flash_block_list *f;
      int i;
      unsigned long block_size, image_size;

      /* Paranoid self test here.  We also collect the image size. */
      image_size = 0;
      for (f = flist; f; f = f->next) {
            for (i = 0; i < f->num_blocks; i++) {
                  if (f->blocks[i].data == NULL) {
                        return FLASH_IMG_NULL_DATA;
                  }
                  block_size = f->blocks[i].length;
                  if (block_size <= 0 || block_size > RTAS_BLK_SIZE) {
                        return FLASH_IMG_BAD_LEN;
                  }
                  image_size += block_size;
            }
      }

      if (image_size < (256 << 10)) {
            if (image_size < 2) 
                  return FLASH_NO_OP;
      }

      printk(KERN_INFO "FLASH: flash image with %ld bytes stored for hardware flash on reboot\n", image_size);

      return FLASH_IMG_READY;
}

static void free_flash_list(struct flash_block_list *f)
{
      struct flash_block_list *next;
      int i;

      while (f) {
            for (i = 0; i < f->num_blocks; i++)
                  kmem_cache_free(flash_block_cache, f->blocks[i].data);
            next = f->next;
            kmem_cache_free(flash_block_cache, f);
            f = next;
      }
}

static int rtas_flash_release(struct inode *inode, struct file *file)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_update_flash_t *uf;
      
      uf = (struct rtas_update_flash_t *) dp->data;
      if (uf->flist) {    
            /* File was opened in write mode for a new flash attempt */
            /* Clear saved list */
            if (rtas_firmware_flash_list.next) {
                  free_flash_list(rtas_firmware_flash_list.next);
                  rtas_firmware_flash_list.next = NULL;
            }

            if (uf->status != FLASH_AUTH)  
                  uf->status = flash_list_valid(uf->flist);

            if (uf->status == FLASH_IMG_READY) 
                  rtas_firmware_flash_list.next = uf->flist;
            else
                  free_flash_list(uf->flist);

            uf->flist = NULL;
      }

      atomic_dec(&dp->count);
      return 0;
}

static void get_flash_status_msg(int status, char *buf)
{
      char *msg;

      switch (status) {
      case FLASH_AUTH:
            msg = "error: this partition does not have service authority\n";
            break;
      case FLASH_NO_OP:
            msg = "info: no firmware image for flash\n";
            break;
      case FLASH_IMG_SHORT:
            msg = "error: flash image short\n";
            break;
      case FLASH_IMG_BAD_LEN:
            msg = "error: internal error bad length\n";
            break;
      case FLASH_IMG_NULL_DATA:
            msg = "error: internal error null data\n";
            break;
      case FLASH_IMG_READY:
            msg = "ready: firmware image ready for flash on reboot\n";
            break;
      default:
            sprintf(buf, "error: unexpected status value %d\n", status);
            return;
      }

      strcpy(buf, msg); 
}

/* Reading the proc file will show status (not the firmware contents) */
static ssize_t rtas_flash_read(struct file *file, char __user *buf,
                         size_t count, loff_t *ppos)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_update_flash_t *uf;
      char msg[RTAS_MSG_MAXLEN];
      int msglen;

      uf = (struct rtas_update_flash_t *) dp->data;

      if (!strcmp(dp->name, FIRMWARE_FLASH_NAME)) {
            get_flash_status_msg(uf->status, msg);
      } else {       /* FIRMWARE_UPDATE_NAME */
            sprintf(msg, "%d\n", uf->status);
      }
      msglen = strlen(msg);
      if (msglen > count)
            msglen = count;

      if (ppos && *ppos != 0)
            return 0;   /* be cheap */

      if (!access_ok(VERIFY_WRITE, buf, msglen))
            return -EINVAL;

      if (copy_to_user(buf, msg, msglen))
            return -EFAULT;

      if (ppos)
            *ppos = msglen;
      return msglen;
}

/* constructor for flash_block_cache */
void rtas_block_ctor(void *ptr)
{
      memset(ptr, 0, RTAS_BLK_SIZE);
}

/* We could be much more efficient here.  But to keep this function
 * simple we allocate a page to the block list no matter how small the
 * count is.  If the system is low on memory it will be just as well
 * that we fail....
 */
static ssize_t rtas_flash_write(struct file *file, const char __user *buffer,
                        size_t count, loff_t *off)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_update_flash_t *uf;
      char *p;
      int next_free;
      struct flash_block_list *fl;

      uf = (struct rtas_update_flash_t *) dp->data;

      if (uf->status == FLASH_AUTH || count == 0)
            return count;     /* discard data */

      /* In the case that the image is not ready for flashing, the memory
       * allocated for the block list will be freed upon the release of the 
       * proc file
       */
      if (uf->flist == NULL) {
            uf->flist = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
            if (!uf->flist)
                  return -ENOMEM;
      }

      fl = uf->flist;
      while (fl->next)
            fl = fl->next; /* seek to last block_list for append */
      next_free = fl->num_blocks;
      if (next_free == FLASH_BLOCKS_PER_NODE) {
            /* Need to allocate another block_list */
            fl->next = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
            if (!fl->next)
                  return -ENOMEM;
            fl = fl->next;
            next_free = 0;
      }

      if (count > RTAS_BLK_SIZE)
            count = RTAS_BLK_SIZE;
      p = kmem_cache_alloc(flash_block_cache, GFP_KERNEL);
      if (!p)
            return -ENOMEM;
      
      if(copy_from_user(p, buffer, count)) {
            kmem_cache_free(flash_block_cache, p);
            return -EFAULT;
      }
      fl->blocks[next_free].data = p;
      fl->blocks[next_free].length = count;
      fl->num_blocks++;

      return count;
}

static int rtas_excl_open(struct inode *inode, struct file *file)
{
      struct proc_dir_entry *dp = PDE(inode);

      /* Enforce exclusive open with use count of PDE */
      spin_lock(&flash_file_open_lock);
      if (atomic_read(&dp->count) > 2) {
            spin_unlock(&flash_file_open_lock);
            return -EBUSY;
      }

      atomic_inc(&dp->count);
      spin_unlock(&flash_file_open_lock);
      
      return 0;
}

static int rtas_excl_release(struct inode *inode, struct file *file)
{
      struct proc_dir_entry *dp = PDE(inode);

      atomic_dec(&dp->count);

      return 0;
}

static void manage_flash(struct rtas_manage_flash_t *args_buf)
{
      s32 rc;

      do {
            rc = rtas_call(rtas_token("ibm,manage-flash-image"), 1, 
                         1, NULL, args_buf->op);
      } while (rtas_busy_delay(rc));

      args_buf->status = rc;
}

static ssize_t manage_flash_read(struct file *file, char __user *buf,
                         size_t count, loff_t *ppos)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_manage_flash_t *args_buf;
      char msg[RTAS_MSG_MAXLEN];
      int msglen;

      args_buf = (struct rtas_manage_flash_t *) dp->data;
      if (args_buf == NULL)
            return 0;

      msglen = sprintf(msg, "%d\n", args_buf->status);
      if (msglen > count)
            msglen = count;

      if (ppos && *ppos != 0)
            return 0;   /* be cheap */

      if (!access_ok(VERIFY_WRITE, buf, msglen))
            return -EINVAL;

      if (copy_to_user(buf, msg, msglen))
            return -EFAULT;

      if (ppos)
            *ppos = msglen;
      return msglen;
}

static ssize_t manage_flash_write(struct file *file, const char __user *buf,
                        size_t count, loff_t *off)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_manage_flash_t *args_buf;
      const char reject_str[] = "0";
      const char commit_str[] = "1";
      char stkbuf[10];
      int op;

      args_buf = (struct rtas_manage_flash_t *) dp->data;
      if ((args_buf->status == MANAGE_AUTH) || (count == 0))
            return count;
            
      op = -1;
      if (buf) {
            if (count > 9) count = 9;
            if (copy_from_user (stkbuf, buf, count)) {
                  return -EFAULT;
            }
            if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) 
                  op = RTAS_REJECT_TMP_IMG;
            else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) 
                  op = RTAS_COMMIT_TMP_IMG;
      }
      
      if (op == -1)   /* buf is empty, or contains invalid string */
            return -EINVAL;

      args_buf->op = op;
      manage_flash(args_buf);

      return count;
}

static void validate_flash(struct rtas_validate_flash_t *args_buf)
{
      int token = rtas_token("ibm,validate-flash-image");
      int update_results;
      s32 rc;     

      rc = 0;
      do {
            spin_lock(&rtas_data_buf_lock);
            memcpy(rtas_data_buf, args_buf->buf, VALIDATE_BUF_SIZE);
            rc = rtas_call(token, 2, 2, &update_results, 
                         (u32) __pa(rtas_data_buf), args_buf->buf_size);
            memcpy(args_buf->buf, rtas_data_buf, VALIDATE_BUF_SIZE);
            spin_unlock(&rtas_data_buf_lock);
      } while (rtas_busy_delay(rc));

      args_buf->status = rc;
      args_buf->update_results = update_results;
}

static int get_validate_flash_msg(struct rtas_validate_flash_t *args_buf, 
                               char *msg)
{
      int n;

      if (args_buf->status >= VALIDATE_TMP_UPDATE) { 
            n = sprintf(msg, "%d\n", args_buf->update_results);
            if ((args_buf->update_results >= VALIDATE_CUR_UNKNOWN) ||
                (args_buf->update_results == VALIDATE_TMP_UPDATE))
                  n += sprintf(msg + n, "%s\n", args_buf->buf);
      } else {
            n = sprintf(msg, "%d\n", args_buf->status);
      }
      return n;
}

static ssize_t validate_flash_read(struct file *file, char __user *buf,
                         size_t count, loff_t *ppos)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_validate_flash_t *args_buf;
      char msg[RTAS_MSG_MAXLEN];
      int msglen;

      args_buf = (struct rtas_validate_flash_t *) dp->data;

      if (ppos && *ppos != 0)
            return 0;   /* be cheap */
      
      msglen = get_validate_flash_msg(args_buf, msg);
      if (msglen > count)
            msglen = count;

      if (!access_ok(VERIFY_WRITE, buf, msglen))
            return -EINVAL;

      if (copy_to_user(buf, msg, msglen))
            return -EFAULT;

      if (ppos)
            *ppos = msglen;
      return msglen;
}

static ssize_t validate_flash_write(struct file *file, const char __user *buf,
                            size_t count, loff_t *off)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_validate_flash_t *args_buf;
      int rc;

      args_buf = (struct rtas_validate_flash_t *) dp->data;

      if (dp->data == NULL) {
            dp->data = kmalloc(sizeof(struct rtas_validate_flash_t), 
                        GFP_KERNEL);
            if (dp->data == NULL) 
                  return -ENOMEM;
      }

      /* We are only interested in the first 4K of the
       * candidate image */
      if ((*off >= VALIDATE_BUF_SIZE) || 
            (args_buf->status == VALIDATE_AUTH)) {
            *off += count;
            return count;
      }

      if (*off + count >= VALIDATE_BUF_SIZE)  {
            count = VALIDATE_BUF_SIZE - *off;
            args_buf->status = VALIDATE_READY;  
      } else {
            args_buf->status = VALIDATE_INCOMPLETE;
      }

      if (!access_ok(VERIFY_READ, buf, count)) {
            rc = -EFAULT;
            goto done;
      }
      if (copy_from_user(args_buf->buf + *off, buf, count)) {
            rc = -EFAULT;
            goto done;
      }

      *off += count;
      rc = count;
done:
      if (rc < 0) {
            kfree(dp->data);
            dp->data = NULL;
      }
      return rc;
}

static int validate_flash_release(struct inode *inode, struct file *file)
{
      struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
      struct rtas_validate_flash_t *args_buf;

      args_buf = (struct rtas_validate_flash_t *) dp->data;

      if (args_buf->status == VALIDATE_READY) {
            args_buf->buf_size = VALIDATE_BUF_SIZE;
            validate_flash(args_buf);
      }

      /* The matching atomic_inc was in rtas_excl_open() */
      atomic_dec(&dp->count);

      return 0;
}

static void rtas_flash_firmware(int reboot_type)
{
      unsigned long image_size;
      struct flash_block_list *f, *next, *flist;
      unsigned long rtas_block_list;
      int i, status, update_token;

      if (rtas_firmware_flash_list.next == NULL)
            return;           /* nothing to do */

      if (reboot_type != SYS_RESTART) {
            printk(KERN_ALERT "FLASH: firmware flash requires a reboot\n");
            printk(KERN_ALERT "FLASH: the firmware image will NOT be flashed\n");
            return;
      }

      update_token = rtas_token("ibm,update-flash-64-and-reboot");
      if (update_token == RTAS_UNKNOWN_SERVICE) {
            printk(KERN_ALERT "FLASH: ibm,update-flash-64-and-reboot "
                   "is not available -- not a service partition?\n");
            printk(KERN_ALERT "FLASH: firmware will not be flashed\n");
            return;
      }

      /* NOTE: the "first" block list is a global var with no data
       * blocks in the kernel data segment.  We do this because
       * we want to ensure this block_list addr is under 4GB.
       */
      rtas_firmware_flash_list.num_blocks = 0;
      flist = (struct flash_block_list *)&rtas_firmware_flash_list;
      rtas_block_list = virt_to_abs(flist);
      if (rtas_block_list >= 4UL*1024*1024*1024) {
            printk(KERN_ALERT "FLASH: kernel bug...flash list header addr above 4GB\n");
            return;
      }

      printk(KERN_ALERT "FLASH: preparing saved firmware image for flash\n");
      /* Update the block_list in place. */
      image_size = 0;
      for (f = flist; f; f = next) {
            /* Translate data addrs to absolute */
            for (i = 0; i < f->num_blocks; i++) {
                  f->blocks[i].data = (char *)virt_to_abs(f->blocks[i].data);
                  image_size += f->blocks[i].length;
            }
            next = f->next;
            /* Don't translate NULL pointer for last entry */
            if (f->next)
                  f->next = (struct flash_block_list *)virt_to_abs(f->next);
            else
                  f->next = NULL;
            /* make num_blocks into the version/length field */
            f->num_blocks = (FLASH_BLOCK_LIST_VERSION << 56) | ((f->num_blocks+1)*16);
      }

      printk(KERN_ALERT "FLASH: flash image is %ld bytes\n", image_size);
      printk(KERN_ALERT "FLASH: performing flash and reboot\n");
      rtas_progress("Flashing        \n", 0x0);
      rtas_progress("Please Wait...  ", 0x0);
      printk(KERN_ALERT "FLASH: this will take several minutes.  Do not power off!\n");
      status = rtas_call(update_token, 1, 1, NULL, rtas_block_list);
      switch (status) { /* should only get "bad" status */
          case 0:
            printk(KERN_ALERT "FLASH: success\n");
            break;
          case -1:
            printk(KERN_ALERT "FLASH: hardware error.  Firmware may not be not flashed\n");
            break;
          case -3:
            printk(KERN_ALERT "FLASH: image is corrupt or not correct for this platform.  Firmware not flashed\n");
            break;
          case -4:
            printk(KERN_ALERT "FLASH: flash failed when partially complete.  System may not reboot\n");
            break;
          default:
            printk(KERN_ALERT "FLASH: unknown flash return code %d\n", status);
            break;
      }
}

static void remove_flash_pde(struct proc_dir_entry *dp)
{
      if (dp) {
            kfree(dp->data);
            dp->owner = NULL;
            remove_proc_entry(dp->name, dp->parent);
      }
}

static int initialize_flash_pde_data(const char *rtas_call_name,
                             size_t buf_size,
                             struct proc_dir_entry *dp)
{
      int *status;
      int token;

      dp->data = kzalloc(buf_size, GFP_KERNEL);
      if (dp->data == NULL) {
            remove_flash_pde(dp);
            return -ENOMEM;
      }

      /*
       * This code assumes that the status int is the first member of the
       * struct 
       */
      status = (int *) dp->data;
      token = rtas_token(rtas_call_name);
      if (token == RTAS_UNKNOWN_SERVICE)
            *status = FLASH_AUTH;
      else
            *status = FLASH_NO_OP;

      return 0;
}

static struct proc_dir_entry *create_flash_pde(const char *filename,
                                     const struct file_operations *fops)
{
      return proc_create(filename, S_IRUSR | S_IWUSR, NULL, fops);
}

static const struct file_operations rtas_flash_operations = {
      .owner            = THIS_MODULE,
      .read       = rtas_flash_read,
      .write            = rtas_flash_write,
      .open       = rtas_excl_open,
      .release    = rtas_flash_release,
};

static const struct file_operations manage_flash_operations = {
      .owner            = THIS_MODULE,
      .read       = manage_flash_read,
      .write            = manage_flash_write,
      .open       = rtas_excl_open,
      .release    = rtas_excl_release,
};

static const struct file_operations validate_flash_operations = {
      .owner            = THIS_MODULE,
      .read       = validate_flash_read,
      .write            = validate_flash_write,
      .open       = rtas_excl_open,
      .release    = validate_flash_release,
};

static int __init rtas_flash_init(void)
{
      int rc;

      if (rtas_token("ibm,update-flash-64-and-reboot") ==
                   RTAS_UNKNOWN_SERVICE) {
            printk(KERN_ERR "rtas_flash: no firmware flash support\n");
            return 1;
      }

      firmware_flash_pde = create_flash_pde("ppc64/rtas/"
                                    FIRMWARE_FLASH_NAME,
                                    &rtas_flash_operations);
      if (firmware_flash_pde == NULL) {
            rc = -ENOMEM;
            goto cleanup;
      }

      rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
                               sizeof(struct rtas_update_flash_t), 
                               firmware_flash_pde);
      if (rc != 0)
            goto cleanup;

      firmware_update_pde = create_flash_pde("ppc64/rtas/"
                                     FIRMWARE_UPDATE_NAME,
                                     &rtas_flash_operations);
      if (firmware_update_pde == NULL) {
            rc = -ENOMEM;
            goto cleanup;
      }

      rc = initialize_flash_pde_data("ibm,update-flash-64-and-reboot",
                               sizeof(struct rtas_update_flash_t), 
                               firmware_update_pde);
      if (rc != 0)
            goto cleanup;

      validate_pde = create_flash_pde("ppc64/rtas/" VALIDATE_FLASH_NAME,
                                    &validate_flash_operations);
      if (validate_pde == NULL) {
            rc = -ENOMEM;
            goto cleanup;
      }

      rc = initialize_flash_pde_data("ibm,validate-flash-image",
                                   sizeof(struct rtas_validate_flash_t), 
                               validate_pde);
      if (rc != 0)
            goto cleanup;

      manage_pde = create_flash_pde("ppc64/rtas/" MANAGE_FLASH_NAME,
                              &manage_flash_operations);
      if (manage_pde == NULL) {
            rc = -ENOMEM;
            goto cleanup;
      }

      rc = initialize_flash_pde_data("ibm,manage-flash-image",
                                 sizeof(struct rtas_manage_flash_t),
                               manage_pde);
      if (rc != 0)
            goto cleanup;

      rtas_flash_term_hook = rtas_flash_firmware;

      flash_block_cache = kmem_cache_create("rtas_flash_cache",
                        RTAS_BLK_SIZE, RTAS_BLK_SIZE, 0,
                        rtas_block_ctor);
      if (!flash_block_cache) {
            printk(KERN_ERR "%s: failed to create block cache\n",
                        __func__);
            rc = -ENOMEM;
            goto cleanup;
      }
      return 0;

cleanup:
      remove_flash_pde(firmware_flash_pde);
      remove_flash_pde(firmware_update_pde);
      remove_flash_pde(validate_pde);
      remove_flash_pde(manage_pde);

      return rc;
}

static void __exit rtas_flash_cleanup(void)
{
      rtas_flash_term_hook = NULL;

      if (flash_block_cache)
            kmem_cache_destroy(flash_block_cache);

      remove_flash_pde(firmware_flash_pde);
      remove_flash_pde(firmware_update_pde);
      remove_flash_pde(validate_pde);
      remove_flash_pde(manage_pde);
}

module_init(rtas_flash_init);
module_exit(rtas_flash_cleanup);
MODULE_LICENSE("GPL");

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