[U-Boot] [RFC] [PATCH 0/4] Add support for Freescale's 85xx and P1/P2xxx eSPI controller

Xie Shaohui-B21989
2010-10-13T10:25:02Z

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 at lists.denx.de
[mailto:u-boot-bounces at lists.denx.de]
> On Behalf Of Can Aydin
> Sent: Tuesday, September 28, 2010 5:57 PM
> To: u-boot at 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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