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

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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>
This commit is contained in:
Sekhar Nori 2010-08-09 15:46:39 +05:30 committed by Kevin Hilman
parent 217f13662f
commit 18a8505cc1
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mach-davinci/board-da850-evm.c
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@ -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[] = {