[MTD] NAND: Add suspend/resume functionality

The changes introduced allow to suspend/resume NAND flash.
A new state (FL_PM_SUSPENDED) is introduced, as well as
routines for mtd->suspend and mtd->resume to put the flash in
suspended state from software pov.

Signed-off-by: Vitaly Wool <vwool@ru.mvista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 42 insertions, 7 deletions

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index cdf108619344..4e22317397e8 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -46,6 +46,8 @@
  *              perform extra error status checks on erase and write failures.  This required
  *              adding a wrapper function for nand_read_ecc.
  *
+ * 08-20-2005   vwool: suspend/resume added
+ *
  * Credits:
  *      David Woodhouse for adding multichip support  
  *      
@@ -59,7 +61,7 @@
  *      The AG-AND chips have nice features for speed improvement,
  *      which are not supported yet. Read / program 4 pages in one go.
  *
- * $Id: nand_base.c,v 1.148 2005/08/04 17:14:48 gleixner Exp $
+ * $Id: nand_base.c,v 1.150 2005/09/15 13:58:48 vwool Exp $
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -153,7 +155,7 @@ static int nand_verify_pages (struct mtd_info *mtd, struct nand_chip *this, int
 #define nand_verify_pages(...) (0)
 #endif
                 
-static void nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state);
+static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state);
 
 /**
  * nand_release_device - [GENERIC] release chip
@@ -756,7 +758,7 @@ static void nand_command_lp (struct mtd_info *mtd, unsigned command, int column,
  *
  * Get the device and lock it for exclusive access
  */
-static void nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state)
+static int nand_get_device (struct nand_chip *this, struct mtd_info *mtd, int new_state)
 {
         struct nand_chip *active;
         spinlock_t *lock;
@@ -779,7 +781,11 @@ retry:
         if (active == this && this->state == FL_READY) {
                 this->state = new_state;
                 spin_unlock(lock);
-                return;
+                return 0;
+        }
+        if (new_state == FL_PM_SUSPENDED) {
+                spin_unlock(lock);
+                return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
         }
         set_current_state(TASK_UNINTERRUPTIBLE);
         add_wait_queue(wq, &wait);
@@ -2285,6 +2291,34 @@ static int nand_block_markbad (struct mtd_info *mtd, loff_t ofs)
 }
 
 /**
+ * nand_suspend - [MTD Interface] Suspend the NAND flash
+ * @mtd:        MTD device structure
+ */
+static int nand_suspend(struct mtd_info *mtd)
+{
+        struct nand_chip *this = mtd->priv;
+
+        return nand_get_device (this, mtd, FL_PM_SUSPENDED);
+}
+
+/**
+ * nand_resume - [MTD Interface] Resume the NAND flash
+ * @mtd:        MTD device structure
+ */
+static void nand_resume(struct mtd_info *mtd)
+{
+        struct nand_chip *this = mtd->priv;
+
+        if (this->state == FL_PM_SUSPENDED)
+                nand_release_device(mtd);
+        else
+                printk(KERN_ERR "resume() called for the chip which is not "
+                                "in suspended state\n");
+
+}
+
+
+/**
  * nand_scan - [NAND Interface] Scan for the NAND device
  * @mtd:        MTD device structure
  * @maxchips:   Number of chips to scan for
@@ -2643,8 +2677,8 @@ int nand_scan (struct mtd_info *mtd, int maxchips)
         mtd->sync = nand_sync;
         mtd->lock = NULL;
         mtd->unlock = NULL;
-        mtd->suspend = NULL;
-        mtd->resume = NULL;
+        mtd->suspend = nand_suspend;
+        mtd->resume = nand_resume;
         mtd->block_isbad = nand_block_isbad;
         mtd->block_markbad = nand_block_markbad;
 
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 9b5b76217584..2d36413b2f94 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -5,7 +5,7 @@
  *                     Steven J. Hill <sjhill@realitydiluted.com>
  *                     Thomas Gleixner <tglx@linutronix.de>
  *
- * $Id: nand.h,v 1.73 2005/05/31 19:39:17 gleixner Exp $
+ * $Id: nand.h,v 1.74 2005/09/15 13:58:50 vwool Exp $
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -244,6 +244,7 @@ typedef enum {
         FL_ERASING,
         FL_SYNCING,
         FL_CACHEDPRG,
+        FL_PM_SUSPENDED,
 } nand_state_t;
 
 /* Keep gcc happy */