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commit f061523f6a4237127e17e153a0fa3df38f0cfe8d from
git@git.assembla.com:cavium/WindRiver.linux.git
Octeon/OcteonTX MMC supports up to 3 mmc slots, but any
level-shifting to accommodate different signal voltages is
done by external hardware, under control of an optional
vqmmc regulator object, typically controlled by gpio.
See Documentation/devicetree/bindings/mmc/cavium-mmc.txt
for a detailed explanation of device-tree control of MMC
signals via GPIO at reset and slot-switching time.
If any mmc-slots have a vqmmc-supply property,
take it as a warning that we must switch carefully between
slots (unless they have the same vqmmc object), tri-stating
MMC signals to avoid any transient states as level-shifters
are enabled/disabled, by zeroing MIO_EMM_CFG[bus_id].
There's no need to list vqmmc property if all the mmc-slots
on a board run at same signal voltage, and have same width.
In this case the old behavior, enabling all probed slots in
MIO_EMM_CFG, allows faster slot-switching.
Change-Id: I6994d52a33b6f7f1911ab0f14b8639823ac20488
Signed-off-by: Peter Swain <pswain@cavium.com>
Reviewed-on: https://sj1git1.cavium.com/8728
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Chandrakala Chavva <cchavva@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/16107
Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Tested-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
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commit 6400362bc7c5d7a84002d977413f3d899b32df22 from
git@git.assembla.com:cavium/WindRiver.linux.git
Code motion to allow the upcoming vqmmc-switching commit
to fit nicely. No change to actual operation, except to
correct several IS_ERR() to IS_ERR_OR_NULL() which
would have segfaulted in the NULL case.
The do_switch() & cvm_mmc_switch_to() functions were
becoming unwieldly, and about to become more so, when
vqmmc-switching is introduced.
- mode_switch() does the low level EMM_MMC_SWITCH change
- pre_switch() prepares for a slot switch, notes if it's
needed
- post_switch() performs final actions, if a slot switch
was needed
Some code has moved from cvm_mmc_switch_to() to do_switch()
and now happens on every invocation, including probe-time,
but will have no effect on post-probe runtime
Change-Id: If21c93ea11f18bcffe79796cc7ff29e45bdf3e96
Signed-off-by: Peter Swain <pswain@cavium.com>
Signed-off-by: Sujeet Baranwal <sbaranwal@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/14923
Reviewed-by: Sujeet Kumar Baranwal <Sujeet.Baranwal@cavium.com>
Tested-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
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Add description of Cavium Octeon and ThunderX SOC device tree bindings.
CC: Ulf Hansson <ulf.hansson@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Mark Rutland <mark.rutland@arm.com>
CC: devicetree@vger.kernel.org
Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Steven J. Hill <steven.hill@cavium.com>
Acked-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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Peter Swain
Jan Glauber