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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
..
chips mtd: jedec_probe: fix LH28F640BF definition 2013-08-05 21:04:17 +01:00
devices mtd: diskonchip: remove unused entries in Kconfig 2013-08-05 21:01:55 +01:00
lpddr mtd: lpddr: replace open-coded ARRAY_SIZE with macro 2012-05-13 22:47:31 -05:00
maps mtd: remove obsolete JEDEC mapping drivers 2013-08-05 21:01:08 +01:00
nand mtd: atmel_nand: enable Nand Flash Controller (NFC) read data via sram 2013-08-05 21:07:48 +01:00
onenand mtd: onenand/samsung: Remove redundant platform_set_drvdata() 2013-08-05 20:50:08 +01:00
tests mtd: tests: don't print error messages when out-of-memory 2013-08-05 20:49:22 +01:00
ubi A couple of fixes and clean-ups, allow for assigning user-defined 2013-07-05 12:09:48 -07:00
Kconfig mtd: merge mtdchar module with mtdcore 2013-04-05 13:16:54 +01:00
Makefile mtd: merge mtdchar module with mtdcore 2013-04-05 13:16:54 +01:00
afs.c mtd: introduce mtd_read interface 2012-01-09 18:25:19 +00:00
ar7part.c mtd: Allow removal of partitioning modules 2013-02-04 09:27:33 +02:00
bcm47xxpart.c mtd: bcm47xxpart: look for NVRAM at the end of device 2013-03-08 11:36:00 +00:00
bcm63xxpart.c mtd: bcm63xxpart: use nvram for PSI size 2013-08-05 18:59:34 +01:00
cmdlinepart.c mtd: Allow removal of partitioning modules 2013-02-04 09:27:33 +02:00
ftl.c mtd: do not use mtd->sync directly 2012-01-09 18:26:21 +00:00
inftlcore.c mtd: add leading underscore to all mtd functions 2012-03-27 00:20:01 +01:00
inftlmount.c mtd: introduce mtd_block_markbad interface 2012-01-09 18:25:48 +00:00
mtd_blkdevs.c block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
mtdblock.c mtd_blktrans_ops->release() should return void 2013-05-05 21:31:22 -04:00
mtdblock_ro.c mtd: introduce mtd_write interface 2012-01-09 18:25:20 +00:00
mtdchar.c mtdchar: switch to fixed_size_llseek() 2013-06-29 12:57:27 +04:00
mtdconcat.c mtd: unify initialization of erase_info->fail_addr 2012-03-27 01:02:24 +01:00
mtdcore.c drivers: avoid format string in dev_set_name 2013-07-03 16:07:41 -07:00
mtdcore.h mtd: merge mtdchar module with mtdcore 2013-04-05 13:16:54 +01:00
mtdoops.c mtdoops: don't erase flash at each boot 2012-11-15 15:37:51 +02:00
mtdpart.c mtd: mtdcore: use const qualifier 2013-04-05 13:04:27 +01:00
mtdsuper.c VFS: Pass mount flags to sget() 2012-07-14 16:38:34 +04:00
mtdswap.c mtd: do not use mtd->block_markbad directly 2012-01-09 18:26:26 +00:00
nftlcore.c mtd: nftlcore: remove out-of-date and now irrelevant piece of code 2012-03-27 00:24:03 +01:00
nftlmount.c mtd: introduce mtd_block_markbad interface 2012-01-09 18:25:48 +00:00
ofpart.c mtd: ofpart: support partitions of 4 GiB and larger 2013-04-05 12:05:53 +01:00
redboot.c mtd: redboot: remove useless code 2012-03-27 00:24:14 +01:00
rfd_ftl.c mtd: do not use mtd->sync directly 2012-01-09 18:26:21 +00:00
sm_ftl.c mtd_blktrans_ops->release() should return void 2013-05-05 21:31:22 -04:00
sm_ftl.h mtd: sm_ftl: cosmetic, use bool when possible 2010-10-25 01:33:08 +01:00
ssfdc.c mtd: introduce mtd_block_isbad interface 2012-01-09 18:25:47 +00:00