mtd: nand: Add function to convert ONFI mode to data_interface

onfi_init_data_interface() initializes a data interface with
values from a given ONFI mode.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

2 files changed, 34 insertions, 0 deletions

diff --git a/drivers/mtd/nand/nand_timings.c b/drivers/mtd/nand/nand_timings.c
index 878fe0d5342c..7441d68b78d5 100644
--- a/drivers/mtd/nand/nand_timings.c
+++ b/drivers/mtd/nand/nand_timings.c
@@ -269,3 +269,32 @@ const struct nand_sdr_timings *onfi_async_timing_mode_to_sdr_timings(int mode)
         return &onfi_sdr_timings[mode].timings.sdr;
 }
 EXPORT_SYMBOL(onfi_async_timing_mode_to_sdr_timings);
+
+/**
+ * onfi_init_data_interface - [NAND Interface] Initialize a data interface from
+ * given ONFI mode
+ * @iface: The data interface to be initialized
+ * @mode: The ONFI timing mode
+ */
+int onfi_init_data_interface(struct nand_chip *chip,
+                             struct nand_data_interface *iface,
+                             enum nand_data_interface_type type,
+                             int timing_mode)
+{
+        if (type != NAND_SDR_IFACE)
+                return -EINVAL;
+
+        if (timing_mode < 0 || timing_mode >= ARRAY_SIZE(onfi_sdr_timings))
+                return -EINVAL;
+
+        *iface = onfi_sdr_timings[timing_mode];
+
+        /*
+         * TODO: initialize timings that cannot be deduced from timing mode:
+         * tR, tPROG, tCCS, ...
+         * These information are part of the ONFI parameter page.
+         */
+
+        return 0;
+}
+EXPORT_SYMBOL(onfi_init_data_interface);
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index a625e960c0c3..1f34c04fe16c 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -1112,6 +1112,11 @@ static inline int onfi_get_sync_timing_mode(struct nand_chip *chip)
         return le16_to_cpu(chip->onfi_params.src_sync_timing_mode);
 }
 
+int onfi_init_data_interface(struct nand_chip *chip,
+                             struct nand_data_interface *iface,
+                             enum nand_data_interface_type type,
+                             int timing_mode);
+
 /*
  * Check if it is a SLC nand.
  * The !nand_is_slc() can be used to check the MLC/TLC nand chips.