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