mtd: add helpers to get the supportted ONFI timing mode

add onfi_get_async_timing_mode() to get the supportted asynchronous
timing mode.

add onfi_get_sync_timing_mode() to get the supportted synchronous
timing mode.

Also add the neccessary macros : the timing modes.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 922f313970d..2beeb6e4e4e 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -231,6 +231,15 @@ typedef enum {
 /* Keep gcc happy */
 struct nand_chip;
 
+/* ONFI timing mode, used in both asynchronous and synchronous mode */
+#define ONFI_TIMING_MODE_0              (1 << 0)
+#define ONFI_TIMING_MODE_1              (1 << 1)
+#define ONFI_TIMING_MODE_2              (1 << 2)
+#define ONFI_TIMING_MODE_3              (1 << 3)
+#define ONFI_TIMING_MODE_4              (1 << 4)
+#define ONFI_TIMING_MODE_5              (1 << 5)
+#define ONFI_TIMING_MODE_UNKNOWN        (1 << 6)
+
 /* ONFI feature address */
 #define ONFI_FEATURE_ADDR_TIMING_MODE   0x1
 
@@ -684,4 +693,20 @@ struct platform_nand_chip *get_platform_nandchip(struct mtd_info *mtd)
         return chip->priv;
 }
 
+/* return the supported asynchronous timing mode. */
+static inline int onfi_get_async_timing_mode(struct nand_chip *chip)
+{
+        if (!chip->onfi_version)
+                return ONFI_TIMING_MODE_UNKNOWN;
+        return le16_to_cpu(chip->onfi_params.async_timing_mode);
+}
+
+/* return the supported synchronous timing mode. */
+static inline int onfi_get_sync_timing_mode(struct nand_chip *chip)
+{
+        if (!chip->onfi_version)
+                return ONFI_TIMING_MODE_UNKNOWN;
+        return le16_to_cpu(chip->onfi_params.src_sync_timing_mode);
+}
+
 #endif /* __LINUX_MTD_NAND_H */