On 4/18/2011 1:02 PM, Matthieu CASTET wrote:
Hi,
Murali Nalajala a Ãcrit :
Add initial msm nand driver support for Qualcomm MSM platforms.
This driver is capable of handling both 2k and 4k page support
nand devices.
This driver was originally developed by Arve HjÃnnevÃg at google.
Its source is available at
http://android.git.kernel.org/?p=kernel/msm.git under
android-msm-2.6.35 branch.
CC: Dima Zavin<dima@xxxxxxxxxxx>
CC: Brian Swetland<swetland@xxxxxxxxxx>
CC: Arve HjÃnnevÃg<arve@xxxxxxxxxxx>
Signed-off-by: Murali Nalajala<mnalajal@xxxxxxxxxxxxxx>
---
Changes in V2
* Turn most of the pr_info() calls into pr_debug().
drivers/mtd/devices/Kconfig | 11 +
drivers/mtd/devices/Makefile | 1 +
drivers/mtd/devices/msm_nand.c | 1597 ++++++++++++++++++++++++++++++++++++++++
drivers/mtd/devices/msm_nand.h | 77 ++
4 files changed, 1686 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/devices/msm_nand.c
create mode 100644 drivers/mtd/devices/msm_nand.h
For the record, I am not sure it is a great idea to make nand drivers
independent of the nand layer.
By doing that you could change the expected behavior, and introduce bug
difficult to debug.
Why do you need that ? Nand drivers can override callbacks of nand framework.
Maybe because the nand layer call the driver page per page, and you want to
work with more than one page. But in this case you can extend nand layer.
Or does your controller don't allow sending raw command ?
And in that case all the nand logic is in the nand controller ?
Our controller doesn't allow sending RAW commands to the flash. All
these commands are abstracted by the controller logic. Please refer the
msm_nand.h file where you will find the commands which are different
from the actual NAND device commands.
eg: To send read/write data command to the device we configure the
controller with page address & controller specific command. Then the
controller itself takes care of generating the internal h/w signals
required by the flash and it polls for the R/B signal & wait states are
internally controlled by the h/w.
Matthieu
Thanks,
Murali N
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Sent by an employee of the Qualcomm Innovation Center, Inc.
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