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1ae9c092ef
linux/drivers/mtd/nand
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Josh Wu 1ae9c092ef mtd: atmel_nand: enable Nand Flash Controller (NFC) read data via sram 
NFC has embedded sram which can use to transfer data. This patch enable reading
nand flash via NFC SRAM. It will minimize the CPU overhead.

This driver has been tested on SAMA5D3X-EK with JFFS2, YAFFS2, UBIFS and
mtd-utils.

Here puts the part of mtd_speedtest (read test) result as following:
Compare with non-NFC mtd_speedtest result, reading will reduce %45 cpu load
with increase %80 speed.

- commands use to test:
  # insmod /mnt/mtd_speedtest.ko dev=2 &
  # top -n 30 -d 1 | grep speedtest

- test result:
=================================================
mtd_speedtest: MTD device: 2
mtd_speedtest: MTD device size 41943040, eraseblock size 131072, page size 2048, count of eraseblocks 320, pages per eraseblock 64, OOB size 64
mtd_speedtest: testing eraseblock read speed
  509   495 root     D     1164   0%  28% insmod /mnt/mtd_speedtest.ko dev=2
  509   495 root     D     1164   0%  25% insmod /mnt/mtd_speedtest.ko dev=2
  509   495 root     D     1164   0%  26% insmod /mnt/mtd_speedtest.ko dev=2
mtd_speedtest: eraseblock read speed is 9403 KiB/s
mtd_speedtest: testing page read speed
  509   495 root     R     1164   0%  31% insmod /mnt/mtd_speedtest.ko dev=2
  509   495 root     D     1164   0%  57% insmod /mnt/mtd_speedtest.ko dev=2
  509   495 root     D     1164   0%  53% insmod /mnt/mtd_speedtest.ko dev=2
  509   495 root     D     1164   0%  71% insmod /mnt/mtd_speedtest.ko dev=2
mtd_speedtest: page read speed is 9258 KiB/s

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2013-08-05 21:07:48 +01:00
..
bcm47xxnflash Fairly unexciting MTD merge for 3.9: 2013-03-02 16:33:54 -08:00
gpmi-nand mtd: gpmi-nand: don't use devm_pinctrl_get_select_default() in probe 2013-08-05 21:01:20 +01:00
alauda.c mtd: driver _read() returns max_bitflips; mtd_read() returns -EUCLEAN 2012-05-13 23:14:23 -05:00
ams-delta.c mtd: nand: ams-delta: remove unnecessary platform_set_drvdata() 2013-08-05 20:58:30 +01:00
atmel_nand_ecc.h mtd: at91: atmel_nand: add Programmable Multibit ECC controller support 2012-07-06 18:23:25 +01:00
atmel_nand_nfc.h mtd: atmel_nand: add Nand Flash Controller (NFC) support 2013-08-05 21:07:41 +01:00
atmel_nand.c mtd: atmel_nand: enable Nand Flash Controller (NFC) read data via sram 2013-08-05 21:07:48 +01:00
au1550nd.c mtd: remove use of __devexit 2012-11-22 12:07:03 +02:00
bf5xx_nand.c mtd: nand: bf5xx_nand: remove unnecessary platform_set_drvdata() 2013-08-05 20:58:38 +01:00
cafe_nand.c mtd: nand: subpage write support for hardware based ECC schemes 2013-04-05 13:22:59 +01:00
cmx270_nand.c mtd: kill MTD_NAND_VERIFY_WRITE 2012-09-29 15:00:46 +01:00
cs553x_nand.c mtd cs553x_nand: Initialise ecc.strength before nand_scan() 2012-12-03 16:36:34 +02:00
davinci_nand.c mtd: nand: davinci: use devm_ioremap_resource() 2013-08-05 20:49:10 +01:00
denali_dt.c mtd: denali_dt: Remove redundant use of of_match_ptr 2013-04-05 14:04:34 +01:00
denali_pci.c mtd: remove use of __devexit 2012-11-22 12:07:03 +02:00
denali.c mtd: denali: split the generic driver and PCI layer 2012-11-15 15:37:46 +02:00
denali.h mtd: denali: add a DT driver 2012-11-15 15:37:46 +02:00
diskonchip.c mtd: diskonchip: remove unused entries in Kconfig 2013-08-05 21:01:55 +01:00
docg4.c mtd: nand: docg4: remove unnecessary platform_set_drvdata() 2013-08-05 20:58:42 +01:00
fsl_elbc_nand.c mtd: remove use of __devinit 2012-11-22 12:07:03 +02:00
fsl_ifc_nand.c mtd: fsl_ifc_nand: set NAND_NO_SUBPAGE_WRITE 2013-08-05 19:09:39 +01:00
fsl_upm.c Drivers: mtd: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
fsmc_nand.c mtd: nand: fsmc_nand: remove unnecessary platform_set_drvdata() 2013-08-05 20:58:57 +01:00
gpio.c mtd: nand-gpio: Add missing "owner" field in platform_driver struct 2013-08-05 20:46:21 +01:00
jz4740_nand.c mtd: nand: jz4740_nand: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:05 +01:00
Kconfig mtd: nand-gpio: Unneeded dependency on ARM removed 2013-08-05 20:46:06 +01:00
lpc32xx_mlc.c mtd: nand: lpc32xx: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:06 +01:00
lpc32xx_slc.c mtd: nand: lpc32xx: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:06 +01:00
Makefile mtd: remove the h1910 NAND driver 2013-04-05 13:15:17 +01:00
mpc5121_nfc.c mtd: remove use of __devexit 2012-11-22 12:07:03 +02:00
mxc_nand.c mtd: nand: mxc_nand: Remove unneeded check for platform_get_resource() 2013-08-05 21:01:17 +01:00
nand_base.c mtd: nand: detect OOB size for Toshiba 24nm raw SLC 2013-08-05 21:05:10 +01:00
nand_bbt.c mtd: nand: remove AG-AND support 2013-04-05 12:00:50 +01:00
nand_bch.c mtd: cleanup style on pr_debug messages 2011-09-11 15:02:16 +03:00
nand_ecc.c mtd: nane: print source of error message 2013-02-04 09:27:19 +02:00
nand_ids.c mtd: nand_ids: use size macros 2013-04-05 13:22:06 +01:00
nandsim.c mtd: nandsim: remove unused ns->geom.oobshift 2013-08-05 21:06:02 +01:00
ndfc.c mtd: remove use of __devexit 2012-11-22 12:07:03 +02:00
nuc900_nand.c mtd: nand: nuc900_nand: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:09 +01:00
omap2.c mtd: nand: omap2: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:13 +01:00
orion_nand.c mtd: nand: orion_nand: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:14 +01:00
pasemi_nand.c mtd: remove use of __devexit 2012-11-22 12:07:03 +02:00
plat_nand.c mtd: nand: plat_nand: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:16 +01:00
pxa3xx_nand.c mtd: nand: pxa3xx_nand: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:17 +01:00
r852.c mtd: r852: add CONFIG_PM_SLEEP to suspend/resume functions 2013-08-05 19:00:12 +01:00
r852.h
s3c2410.c mtd: nand: s3c2410: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:19 +01:00
sh_flctl.c mtd: sh_flctl: Use of_match_ptr() macro 2013-04-05 13:20:14 +01:00
sharpsl.c mtd: nand: sharpsl: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:21 +01:00
sm_common.c mtd: nand_ids: use size macros 2013-04-05 13:22:06 +01:00
sm_common.h
socrates_nand.c mtd: remove use of __devexit 2012-11-22 12:07:03 +02:00
tmio_nand.c mtd: kill MTD_NAND_VERIFY_WRITE 2012-09-29 15:00:46 +01:00
txx9ndfmc.c mtd: nand: txx9ndfmc: remove unnecessary platform_set_drvdata() 2013-08-05 20:59:22 +01:00
xway_nand.c mtd: lantiq: Add NAND support on Lantiq XWAY SoC. 2012-09-29 15:05:18 +01:00