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  1. 23 Dec, 2020 7 commits
    • Nishanth Menon's avatar
      ti: k3: common: sec_proxy: Introduce sec_proxy_lite definition · 7f323eb2
      Nishanth Menon authored 
      There are two communication scheme that have been enabled to communicate
with Secure Proxy in TI.
a) A full fledged prioritized communication scheme, which involves upto
   5 threads from the perspective of the host software
b) A much simpler "lite" version which is just a two thread scheme
   involving just a transmit and receive thread scheme.

The (a) system is specifically useful when the SoC is massive
involving multiple processor systems and where the potential for
priority inversion is clearly a system usecase killer. However, this
comes with the baggage of significant die area for larger number of
instances of secure proxy, ring accelerator and backing memories
for queued messages. Example SoCs using this scheme would be:
AM654[1], J721E[2], J7200[3]  etc.

The (b) scheme(aka the lite scheme) is introduced on smaller SoCs
where memory and area concerns are paramount. The tradeoff of
priority loss is acceptable given the reduced number of processors
communicating with the central system controller. This brings about
a very significant area and memory usage savings while the loss of
communication priority has no demonstrable impact. Example SoC using
this scheme would be: AM642[4]

While we can detect using JTAG ID and conceptually handle things
dynamically, adding such a scheme involves a lot of unused data (cost
of ATF memory footprint), pointer lookups (performance cost) and still
due to follow on patches, does'nt negate the need for a different
build configuration. However, (a) and (b) family of SoCs share the
same scheme and addresses etc, this helps minimize our churn quite a
bit

Instead of introducing a complex data structure lookup scheme, lets
keep things simple by first introducing the pieces necessary for an
alternate communication scheme, then introduce a second platform
representing the "lite" family of K3 processors.

NOTE: This is only possible since ATF uses just two (secure) threads
for actual communication with the central system controller. This is
sufficient for the function that ATF uses.

The (a) scheme and the (b) scheme also varies w.r.t the base addresses
used, even though the memory window assigned for them have remained
consistent. We introduce the delta as part of this change as well.
This is expected to remain consistent as a standard in TI SoCs.

References:
[1] See AM65x Technical Reference Manual (SPRUID7, April 2018)
for further details: https://www.ti.com/lit/pdf/spruid7

[2] See J721E Technical Reference Manual (SPRUIL1, May 2019)
for further details: https://www.ti.com/lit/pdf/spruil1

[3] See J7200 Technical Reference Manual (SPRUIU1, June 2020)
for further details: https://www.ti.com/lit/pdf/spruiu1

[4] See AM64X Technical Reference Manual (SPRUIM2, Nov 2020)
for further details: https://www.ti.com/lit/pdf/spruim2

Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Change-Id: I697711ee0e6601965015ddf950fdfdec8e759bfc
      7f323eb2
    • Nishanth Menon's avatar
      ti: k3: Move USE_COHERENT_MEM only for the generic board · ff7b75e2
      Nishanth Menon authored 
      commit 65f7b817

 ("ti: k3: common: Use coherent memory for shared data")
introduced WARMBOOT_ENABLE_DCACHE_EARLY and USE_COHERENT_MEM to handle
multiple clusters across L3 cache systems. This is represented by
"generic" board in k3 platform.

On "lite" platforms, however, system level coherency is lacking since
we don't have a global monitor or an L3 cache controller. Though, at
a cluster level, ARM CPU level coherency is very much possible since
the max number of clusters permitted in lite platform configuration is
"1".

However, we need to be able to disable USE_COHERENT_MEM for the lite
configuration due to the lack of system level coherency.

See docs/getting_started/build-options.rst for further information.
Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Change-Id: I4a0ec150b3f9ea12369254aef834a6cbe82d6be6
      ff7b75e2
    • Suman Anna's avatar
      ti: k3: drivers: ti_sci: Update ti_sci_msg_req_reboot to include domain · 22b7a229
      Suman Anna authored 
      

The ti_sci_msg_req_reboot message payload has been extended to include
a domain field, and this should be zero to reset the entire SoC with
System Firmwares newer than v2020.04. Add the domain field to the
ti_sci_msg_req_reboot message structure for completeness. Set it up
to zero to fix the reboot issues with newer firmwares.

This takes care of the specific ABI that changed and has an impact on
ATF function.
Signed-off-by: default avatarSuman Anna <s-anna@ti.com>
Signed-off-by: default avatarDave Gerlach <d-gerlach@ti.com>
Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Change-Id: I4f8064b9d6555687822dc2b2b8ec97609286fa0b
      22b7a229
    • Nishanth Menon's avatar
      ti: k3: common: sec_proxy: Fill non-message data fields with 0x0 · f577388a
      Nishanth Menon authored 
      

Sec proxy data buffer is 60 bytes with the last of the registers
indicating transmission completion. This however poses a bit
of a challenge.

The backing memory for sec_proxy is regular memory, and all sec proxy
does is to trigger a burst of all 60 bytes of data over to the target
thread backing ring accelerator. It doesn't do a memory scrub when
it moves data out in the burst. When we transmit multiple messages,
remnants of previous message is also transmitted which results in
some random data being set in TISCI fields of messages that have been
expanded forward.

The entire concept of backward compatibility hinges on the fact that
the unused message fields remain 0x0 allowing for 0x0 value to be
specially considered when backward compatibility of message extension
is done.

So, instead of just writing the completion register, we continue
to fill the message buffer up with 0x0 (note: for partial message
involving completion, we already do this).

This allows us to scale and introduce ABI changes back into TF-A only
as needed.
Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Change-Id: Ie22cb2a319f4aa80aef23ffc7e059207e5d4c640
      f577388a
    • Nishanth Menon's avatar
      ti: k3: common: Make plat_get_syscnt_freq2 check CNT_FID0 GTC reg · 6a22d9ea
      Nishanth Menon authored 
      ARM's generic timer[1] picks up it's graycode from GTC. However, the
frequency of the GTC is supposed to be programmed in CNTFID0[2]
register.

In K3, architecture, GTC provides a central time to many parts of the
SoC including graycode to the generic timer in the ARMv8 subsystem.
However, due to the central nature and the need to enable the counter
early in the boot process, the R5 based bootloader enables GTC and
programs it's frequency based on central needs of the system. This
may not be a constant 200MHz based on the system. The bootloader is
supposed to program the FID0 register with the correct frequency it
has sourced for GTC from the central system controller, and TF-A is
supposed to use that as the frequency for it's local timer.

A mismatch in programmed frequency and what we program for generic
timer will, as we can imagine, all kind of weird mayhem.

So, check the CNTFID0 register, if it is 0, warn and use the default
frequency to continue the boot process.

While at it, we can also check CNTCR register to provide some basic
diagnostics to make sure that we don't have OS folks scratch their
heads. Even though this is used during cpu online operations, the cost
of this additional check is minimal enough for us not to use #ifdeffery
with DEBUG flags.

[1] https://developer.arm.com/documentation/100095/0002/generic-timer/generic-timer-register-summary/aarch64-generic-timer-register-summary
[2] https://developer.arm.com/docs/ddi0595/h/external-system-registers/cntfid0
[3] https://developer.arm.com/docs/ddi0595/h/external-system-registers/cntcr

Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Change-Id: Ib03e06788580f3540dcb1a11677d0d6d398b2c9f
      6a22d9ea
    • Nishanth Menon's avatar
      ti: k3: common: Enable A72 erratum 1319367 · 60fba7c8
      Nishanth Menon authored 
      The CatB erratum ARM_ERRATA_A72_1319367 applies to all TI A72
platforms as well.

See the following for further information:
https://developer.arm.com/documentation/epm012079/11/

Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Change-Id: I80c6262b9cdadcb12f6dfd5a21272989ba257719
      60fba7c8
    • Nishanth Menon's avatar
      ti: k3: common: Enable A53 erratum 1530924 · c3e23332
      Nishanth Menon authored 
      The CatB erratum ARM_ERRATA_A53_1530924 applies to all TI A53
platforms as well.

See the following for further information:
https://developer.arm.com/documentation/epm048406/2100

Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Change-Id: Ic095424ce510139e060b38cfb84509d2cc573cad
      c3e23332
  3. 16 Dec, 2020 5 commits
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  15. 07 Dec, 2020 2 commits