davinci: am18x/da850/omap-l138 evm: setup NAND flash timing

Setup the NAND flash timings for DA850 EVM

Before configuring the timing values, throughput calculation
using dd command yielded 469 kB/s write and 966 kB/s read speed.

After the timing configuration, the throughput was measured to
be 2.4 MB/s write and 5 MB/s read.

[Mukul Bhatnagar: actual calculation of timing values from the
NAND datasheet]

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Cc: Mukul Bhatnagar <mbhatnagar@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index 190ebd374656ae202989d5938b5f3695d2f08f8d..c1d45d7ac45b28aa13f323130eb55d7d27916dcb 100644 (file)
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -36,6 +36,7 @@
 #include <mach/da8xx.h>
 #include <mach/nand.h>
 #include <mach/mux.h>
+#include <mach/aemif.h>
 
 #define DA850_EVM_PHY_MASK             0x1
 #define DA850_EVM_MDIO_FREQUENCY       2200000 /* PHY bus frequency */
@@ -143,12 +144,23 @@ static struct mtd_partition da850_evm_nandflash_partition[] = {
        },
 };
 
+static struct davinci_aemif_timing da850_evm_nandflash_timing = {
+       .wsetup         = 24,
+       .wstrobe        = 21,
+       .whold          = 14,
+       .rsetup         = 19,
+       .rstrobe        = 50,
+       .rhold          = 0,
+       .ta             = 20,
+};
+
 static struct davinci_nand_pdata da850_evm_nandflash_data = {
        .parts          = da850_evm_nandflash_partition,
        .nr_parts       = ARRAY_SIZE(da850_evm_nandflash_partition),
        .ecc_mode       = NAND_ECC_HW,
        .ecc_bits       = 4,
        .options        = NAND_USE_FLASH_BBT,
+       .timing         = &da850_evm_nandflash_timing,
 };
 
 static struct resource da850_evm_nandflash_resource[] = {