SPI_ATOMIC_SEQUENCING was added to accomodate spi flash controllers with
the ability to perform tx and rx of flash command and response at the
same time. Instead of introducing this notion at SPI flash driver layer,
clean up the interface to SPI used by flash.
Flash uses a command-response kind of communication. Thus, even though
SPI is duplex, flash command needs to be sent out on SPI bus and then
flash response should be received on the bus. Some specialized x86
flash controllers are capable of handling command and response in a
single transaction.
In order to support all the varied cases:
1. Add spi_xfer_vector that takes as input a vector of SPI operations
and calls back into SPI controller driver to process these operations.
2. In order to accomodate flash command-response model, use two vectors
while calling into spi_xfer_vector -- one with dout set to
non-NULL(command) and other with din set to non-NULL(response).
3. For specialized SPI flash controllers combine two successive vectors
if the transactions look like a command-response pair.
4. Provide helper functions for common cases like supporting only 2
vectors at a time, supporting n vectors at a time, default vector
operation to cycle through all SPI op vectors one by one.
BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully
Change-Id: I4c9e78c585ad95c40c0d5af078ff8251da286236
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17681
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
In Chromium OS downstream this was done together with adding the support
for ATF, but unfortunately ATF upstream isn't ready yet. This commit
is a reminder to enable things once ATF caught up.
Change-Id: Id0d6908d906a1e54cdda4f232d572d996d9c556f
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13968
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
BUG=none
TEST=emerge-oak coreboot
BRANCH=none
Change-Id: I6b05898de2d0022e0de7b18f1db3c3e9c06d8135
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: b614eeb1bba5660438c214e82225832809caca8e
Original-Change-Id: I0f7b0a426dae1548b34114a024c92befdf6002f6
Original-Signed-off-by: Peter Kao <peter.kao@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292692
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13105
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
BRANCH=none
BUG=none
TEST=boot to shell on Rev3
Change-Id: I77c5a8aa31ab10d82115a60bdfee1da35707619f
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 7d511df7f527ae96c2da01804c62fe98a13fed56
Original-Change-Id: I68ab8be50f210fa17bd731b400a087b150566e3b
Original-Signed-off-by: CC Ma <cc.ma@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/303207
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13103
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This patch generalizes the approach previously used for ARM32
TTB_SUBTABLES to "auto-detect" whether a certain region was defined in
memlayout.ld. This allows us to get rid of the explicit Kconfig for the
TIMESTAMP region, reducing configuration redundancy and avoiding
confusion when setting up future boards.
(Removing armv4/bootblock_simple.c because it references this Kconfig
and it is a dead file that I just forgot to remove in CL:12076.)
BRANCH=None
BUG=None
TEST=Booted Oak and confirmed that all pre-RAM timestamps are still
there. Built Nyan and Falco.
Change-Id: I557a4b263018511d17baa4177963130a97ea310a
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13652
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
[pg: split original commit into multiple commits]
Change-Id: I0dc8d9855c98c077d4a47227de0c504c3a846953
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 2827aa08ff8712c0245a22378f3ddb0ca054255d
Original-Change-Id: I94a9ee2c00e25a37a92133f813d0cd11a3503656
Original-Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292662
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/13050
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Don't select SPI_ATOMIC_SEQUENCING unless SPI_FLASH is being used.
warning: (... SOC_MEDIATEK_MT8173) selects SPI_ATOMIC_SEQUENCING
which has unmet direct dependencies (SPI_FLASH)
Change-Id: I93e9a7102d1d0ef62565110b5b3b677da8d0c72b
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12657
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Furquan Shaikh