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davinci: am17x/da830/omap-l137 evm: setup NAND flash timing

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Setup the NAND flash timings for DA830 EVM.

Before configuring the timing values, throughput calculation
using dd command yielded 477 kB/s write and 970 kB/s read speed.

After the timing configuration, the throughput was measured to
be 2.5 MB/s write and 5.1 MB/s read.

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

Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Cc: Mukul Bhatnagar <mbhatnagar@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Sudhakar Rajashekhara 2010-08-09 15:46:38 +05:30 committed by Kevin Hilman
parent fe69c82d08
commit 217f13662f
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mach-davinci/board-da830-evm.c
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@ -29,6 +29,7 @@
#include <mach/nand.h>
#include <mach/da8xx.h>
#include <mach/usb.h>
#include <mach/aemif.h>
#define DA830_EVM_PHY_MASK 0x0
#define DA830_EVM_MDIO_FREQUENCY 2200000 /* PHY bus frequency */
@ -360,6 +361,16 @@ static struct nand_bbt_descr da830_evm_nand_bbt_mirror_descr = {
.pattern = da830_evm_nand_mirror_pattern
};
static struct davinci_aemif_timing da830_evm_nandflash_timing = {
.wsetup = 24,
.wstrobe = 21,
.whold = 14,
.rsetup = 19,
.rstrobe = 50,
.rhold = 0,
.ta = 20,
};
static struct davinci_nand_pdata da830_evm_nand_pdata = {
.parts = da830_evm_nand_partitions,
.nr_parts = ARRAY_SIZE(da830_evm_nand_partitions),
@ -368,6 +379,7 @@ static struct davinci_nand_pdata da830_evm_nand_pdata = {
.options = NAND_USE_FLASH_BBT,
.bbt_td = &da830_evm_nand_bbt_main_descr,
.bbt_md = &da830_evm_nand_bbt_mirror_descr,
.timing = &da830_evm_nandflash_timing,
};
static struct resource da830_evm_nand_resources[] = {