Hi Can,
Are there any differences between your patches and http://lists.denx.de/pipermail/u-boot/2009-March/049093.html ?
Best Regards, Shaohui Xie
-----Original Message----- From: u-boot-bounces@lists.denx.de
[mailto:u-boot-bounces@lists.denx.de]
On Behalf Of Can Aydin Sent: Tuesday, September 28, 2010 5:57 PM To: u-boot@lists.denx.de Subject: [U-Boot] [RFC] [PATCH 0/4] Add support for Freescale's 85xx
and
P1/P2xxx eSPI controller
Hi All,
This patch series adds support for the eSPI controller found on the
newer
range of Freescale SoCs including the 85xx, P1/P2xx (and I believe the P4xx) series.
The reason this is an RFC is that unfortunately the hardware on these chips does not permit indefinite SPI transactions on a given chip
select.
A chip select is asserted only when a 'transaction length' has been passed to the controller. Once the number of characters specified in
the
transaction length have been transmitted, the controller decides that
the
'frame' has ended and de-asserts the chip select after a defined
delay.
It is not possible to initiate a second transfer without
re-initialising
the command register, and hence clearing and re-asserting a chip
select
signal.
This patch set addresses the issue by defining a read/write function
in
the spi_flash_internal API. Subsequent patches add the freescale eSPI driver and add support for it in the spansion driver and the P1/P2
board
configuration header.
I'm pretty sure that there are better ways of doing this, especially
if a
driver model with support for driver quirks was implemented for
instance.
Until then however, I assume having some sort of ability to use the
SPI
controller on these boards would be better than not being able to do anything at all. If anyone has a better solution please feel free to comment.
Regards,
Can
-- drivers/mtd/spi/spansion.c | 60 ++++++++- drivers/mtd/spi/spi_flash.c | 38 +++++- drivers/mtd/spi/spi_flash_internal.h | 9 ++ drivers/spi/Makefile | 1 + drivers/spi/fsl_espi.c | 251 ++++++++++++++++++++++++++++++++++ include/configs/P1_P2_RDB.h | 18 +++ include/fsl_espi.h | 50 +++++++ 7 files changed, 419 insertions(+), 8 deletions(-) mode change 100644 => 100755 drivers/mtd/spi/spansion.c mode change 100644 => 100755 drivers/mtd/spi/spi_flash.c mode change 100644 => 100755 drivers/mtd/spi/spi_flash_internal.h create mode 100755 drivers/spi/fsl_espi.c create mode 100755 include/fsl_espi.h
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