Commit 456930d8 authored by Stefan Agner's avatar Stefan Agner Committed by Brian Norris

mtd: nand: vf610_nfc: Freescale NFC for VF610, MPC5125 and others

This driver supports Freescale NFC (NAND flash controller) found on
Vybrid (VF610), MPC5125, MCF54418 and Kinetis K70. The driver has
been tested using 8-bit and 16-bit NAND interface on the ARM based
Vybrid SoC VF500 and VF610 platform.
parameter page reading.

Limitations:
- Untested on MPC5125 and M54418.
- DMA and pipelining not used.
- 2K pages or less.
- No chip select, one NAND chip per controller.
- No hardware ECC.

Some paths have been hand-optimized and evaluated by measurements
made using mtd_speedtest.ko on a 100MB MTD partition.

Colibri VF50
        eb write     %   eb read     %   page write      %   page read     %
rel/opt     5175           11537                4560             11039
opt         5164 -0.21     11420 -1.01          4737 +3.88       10918 -1.10
none        5113 -1.20     11352 -1.60          4490 -1.54       10865 -1.58

Colibri VF61
        eb write     %   eb read     %   page write      %   page read     %
rel/opt     5766           13096                5459             12846
opt         5883 +2.03     13064 -0.24          5561 +1.87       12802 -0.34
none        5701 -1.13     12980 -0.89          5488 +0.53       12735 -0.86

rel = using readl_relaxed/writel_relaxed in optimized paths
opt = hand-optimized by combining multiple accesses into one read/write

The measurements have not been statistically verfied, hence use them
with care. The author came to the conclusion that using the relaxed
variants of readl/writel are not worth the additional code.
Signed-off-by: default avatarBill Pringlemeir <bpringlemeir@nbsps.com>
Tested-by: default avatarAlbert ARIBAUD <albert.aribaud@3adev.fr>
Signed-off-by: default avatarStefan Agner <stefan@agner.ch>
Reviewed-by: default avatarAlexey Klimov <klimov.linux@gmail.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 53bb724f
...@@ -11056,6 +11056,12 @@ S: Maintained ...@@ -11056,6 +11056,12 @@ S: Maintained
F: Documentation/fb/uvesafb.txt F: Documentation/fb/uvesafb.txt
F: drivers/video/fbdev/uvesafb.* F: drivers/video/fbdev/uvesafb.*
VF610 NAND DRIVER
M: Stefan Agner <stefan@agner.ch>
L: linux-mtd@lists.infradead.org
S: Supported
F: drivers/mtd/nand/vf610_nfc.c
VFAT/FAT/MSDOS FILESYSTEM VFAT/FAT/MSDOS FILESYSTEM
M: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> M: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
S: Maintained S: Maintained
......
...@@ -460,6 +460,15 @@ config MTD_NAND_MPC5121_NFC ...@@ -460,6 +460,15 @@ config MTD_NAND_MPC5121_NFC
This enables the driver for the NAND flash controller on the This enables the driver for the NAND flash controller on the
MPC5121 SoC. MPC5121 SoC.
config MTD_NAND_VF610_NFC
tristate "Support for Freescale NFC for VF610/MPC5125"
depends on (SOC_VF610 || COMPILE_TEST)
help
Enables support for NAND Flash Controller on some Freescale
processors like the VF610, MPC5125, MCF54418 or Kinetis K70.
The driver supports a maximum 2k page size. The driver
currently does not support hardware ECC.
config MTD_NAND_MXC config MTD_NAND_MXC
tristate "MXC NAND support" tristate "MXC NAND support"
depends on ARCH_MXC depends on ARCH_MXC
......
...@@ -46,6 +46,7 @@ obj-$(CONFIG_MTD_NAND_SOCRATES) += socrates_nand.o ...@@ -46,6 +46,7 @@ obj-$(CONFIG_MTD_NAND_SOCRATES) += socrates_nand.o
obj-$(CONFIG_MTD_NAND_TXX9NDFMC) += txx9ndfmc.o obj-$(CONFIG_MTD_NAND_TXX9NDFMC) += txx9ndfmc.o
obj-$(CONFIG_MTD_NAND_NUC900) += nuc900_nand.o obj-$(CONFIG_MTD_NAND_NUC900) += nuc900_nand.o
obj-$(CONFIG_MTD_NAND_MPC5121_NFC) += mpc5121_nfc.o obj-$(CONFIG_MTD_NAND_MPC5121_NFC) += mpc5121_nfc.o
obj-$(CONFIG_MTD_NAND_VF610_NFC) += vf610_nfc.o
obj-$(CONFIG_MTD_NAND_RICOH) += r852.o obj-$(CONFIG_MTD_NAND_RICOH) += r852.o
obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/ obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
......
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