mtd: add a helper to get the supported features for ONFI nand

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=5b40db68cb1bd14b3d5b159754c9c1bc3bdeb080
Commit:     5b40db68cb1bd14b3d5b159754c9c1bc3bdeb080
Parent:     5138a98f6f47ce62a86cce4b9c381aaf4ad3a643
Author:     Huang Shijie <shijie8 at gmail.com>
AuthorDate: Fri May 17 11:17:28 2013 +0800
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Fri Aug 30 21:34:41 2013 +0100

    mtd: add a helper to get the supported features for ONFI nand
    
    add a helper to get the supported features for ONFI nand.
    Also add the neccessary macros.
    
    Signed-off-by: Huang Shijie <b32955 at freescale.com>
    Reviewed-and-tested-by: Brian Norris <computersforpeace at gmail.com>
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 include/linux/mtd/nand.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 01a7f3c..bf4c566 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -202,6 +202,10 @@ typedef enum {
 /* Keep gcc happy */
 struct nand_chip;
 
+/* ONFI features */
+#define ONFI_FEATURE_16_BIT_BUS		(1 << 0)
+#define ONFI_FEATURE_EXT_PARAM_PAGE	(1 << 7)
+
 /* ONFI timing mode, used in both asynchronous and synchronous mode */
 #define ONFI_TIMING_MODE_0		(1 << 0)
 #define ONFI_TIMING_MODE_1		(1 << 1)
@@ -756,6 +760,12 @@ struct platform_nand_chip *get_platform_nandchip(struct mtd_info *mtd)
 	return chip->priv;
 }
 
+/* return the supported features. */
+static inline int onfi_feature(struct nand_chip *chip)
+{
+	return chip->onfi_version ? le16_to_cpu(chip->onfi_params.features) : 0;
+}
+
 /* return the supported asynchronous timing mode. */
 static inline int onfi_get_async_timing_mode(struct nand_chip *chip)
 {