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At higher SPI bus speeds the SPI RX value is not available in time for
sampling at the normal time. Add a delay to ensure that we read the
correct data.
The value of 40ns is chosen arbitrarily. In my testing I can use a sample
delay of 1 even at 24MHz. But since it is not necessary, I have left that
case alone. It kicks in at 25MHz and up.
BUG=chrome-os-partner:56556
BRANCH=none
TEST=boot on gru and see no change at current speed
Change-Id: I3ef335d9a532eaef1e76034bd02e185acf11176a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: e9b620c47fc3e39211487507fadb8657afdebee7
Original-Change-Id: I65d66d752cbbbee4d02f475de23a52069a0e9782
Original-Signed-off-by: Simon Glass <sjg@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/381311
Original-Commit-Ready: Julius Werner <jwerner@chromium.org>
Original-Tested-by: Simon Glass <sjg@google.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/16707
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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The SPI driver is quite slow at reading data. For example, with a 24MHz
clock on gru it achieves a read speed of only 13.9Mbps.
We can correct this by reading the status registers once, then reading as
many bytes as are available before checking the status registers again. It
seems likely that a status register read requires synchronizing with the
SPI FIFO clock domain, which takes a while.
BUG=chrome-os-partner:56556
BRANCH=none
TEST=run on gru and see the speed increase from 13.920 Mbps to 24.712 Mbps
Change-Id: I24aed0c9c6c5445634c4e056922afaee4e9a7b33
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: 49c2fc20d7d7d703763e9b0a6f68313a349a84b9
Original-Change-Id: I42745f01f0fe069f6ae26d866004d36bb257e6b2
Original-Signed-off-by: Simon Glass <sjg@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/376945
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/16582
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
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If SPI_BASEx is defined (for 2 < x <= 5), allow selecting it.
Since the bus number translates into an offset into an array, require
that all earlier buses are defined, too.
Also assert() that the array is properly sized instead of blindly
exceeding its bounds when called with a too big bus number.
TEST=initializing bus 5 doesn't trap anymore on kevin
BRANCH=none
BUG=none
Change-Id: I69f8ebe10854976608197a13d223ee8a555a9545
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c4af2a4ad4d6eea551653ca300ea6d04f1280919
Original-Change-Id: I27724d64d822ed0ec824a69ed611140bfbe08f5a
Original-Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Original-Reviewed-on: https://chromium-review.googlesource.com/341034
Original-Commit-Ready: Vadim Bendebury <vbendeb@chromium.org>
Original-Tested-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://review.coreboot.org/14723
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
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The driver interface function derives the driver specific pointer from
the API provided handle, no need to use the handle in the local
functions.
BRANCH=none
BUG=none
TEST=SPI interface with the flash ROM is still working properly.
Change-Id: I7725b658365473c733698ca050e780d1dd5072d9
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: a2b42779785623bd1234ab2dfb0b4db76c890fc7
Original-Change-Id: I9d657dc23540e9eac52d2dbfc551ed32b7fa98f0
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/338090
Original-Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/14318
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
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Upcoming designs are based on similar SOCs, this patch moves code
which can be reused into a common directory under soc/rockchip.
Changing spi.h to include stdder.h, as this is were check_member() is
defined, this becomes necessary later when the new SOC code is added.
Renaming UART driver private functions not to be bound to any
particular SOC.
BUG=none
BRANCH=none
TEST=the refactored code works fine on the new platform (with the rest
of the patches applied).
Change-Id: I39a505aecda8849daa58a8eca0e44a5243664423
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: f63f2582042ac115481207ddf329ea2e3260e55e
Original-Change-Id: I3a1139305354d460492b25a45f3da315a9a0b49e
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/335408
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/14235
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
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