The PSCI CPU_ON code accesses quite a few registers. Document
their names to make it easier to cross reference.

Also explain "lock cpu" and "unlock cpu" as enabling/disabling
debug access.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Acked-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

Use a per-CPU variable for saving the target PC during CPU_ON
operations. This allows us to run this service independently on targets
that have more than 2 cores and also core-local power control.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: NTom Rini <trini@konsulko.com>
Reviewed-by: NThierry Reding <treding@nvidia.com>
Tested-by: NThierry Reding <treding@nvidia.com>
Tested-by: NIan Campbell <ijc@hellion.org.uk>
Signed-off-by: NTom Warren <twarren@nvidia.com>

This algorithm will be useful on Tegra as well, plus we will need it for
making _psci_target_pc per-CPU.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: NTom Rini <trini@konsulko.com>
Reviewed-by: NThierry Reding <treding@nvidia.com>
Tested-by: NThierry Reding <treding@nvidia.com>
Tested-by: NIan Campbell <ijc@hellion.org.uk>
Signed-off-by: NTom Warren <twarren@nvidia.com>

_sunxi_cpu_entry can be converted completely into a reusable
psci_cpu_entry. Tegra124 will use it as well.

As with psci_disable_smp, also the enabling is designed to be overloaded
in cased SMP is not controlled via ACTLR.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: NTom Rini <trini@konsulko.com>
Reviewed-by: NThierry Reding <treding@nvidia.com>
Tested-by: NThierry Reding <treding@nvidia.com>
Tested-by: NIan Campbell <ijc@hellion.org.uk>
Signed-off-by: NTom Warren <twarren@nvidia.com>

Move parts of sunxi's psci_cpu_off into psci_cpu_off_common, namely
cache disabling and flushing, clrex and the disabling of SMP for the
dying CPU. These steps are apparently generic for ARMv7 and will be
reused for Tegra124 support.

As the way of disabled SMP is not architectural, though commonly done
via ACLTR, the related function can be overloaded.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: NTom Rini <trini@konsulko.com>
Reviewed-by: NThierry Reding <treding@nvidia.com>
Tested-by: NThierry Reding <treding@nvidia.com>
Tested-by: NIan Campbell <ijc@hellion.org.uk>
Signed-off-by: NTom Warren <twarren@nvidia.com>

Will be required for obtaining the ID of the current CPU in shared PSCI
functions. The default implementation requires a dense ID space and only
supports a single cluster. Therefore, the functions can be overloaded in
cases where these assumptions do not hold.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: NTom Rini <trini@konsulko.com>
Reviewed-by: NThierry Reding <treding@nvidia.com>
Tested-by: NThierry Reding <treding@nvidia.com>
Tested-by: NIan Campbell <ijc@hellion.org.uk>
Acked-by: NIan Campbell <ijc@hellion.org.uk>
Signed-off-by: NTom Warren <twarren@nvidia.com>

This is already invoked a few cycles later in monitor mode by
_secure_monitor (_sunxi_cpu_entry calls _do_nonsec_entry which triggers
_secure_monitor via smc #0). Drop it here, it serves no purpose.

CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: NTom Rini <trini@konsulko.com>
Reviewed-by: NThierry Reding <treding@nvidia.com>
Tested-by: NThierry Reding <treding@nvidia.com>
Tested-by: NIan Campbell <ijc@hellion.org.uk>
Tested-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

make the CPU clock selectable via Kconfig

this removes the sunxi specific CONFIG_CLK_FULL_SPEED defined in each
soc header and replaces it's use in board/sunxi/board.c with
CONFIG_SYS_CLK_FREQ from Kconfig which allows us to configure board
specific frequency on boot
Signed-off-by: NIain Paton <ipaton0@gmail.com>
[hdegoede@redhat.com s/CONFIG_SYS_CLK_FREQ/CONFIG_TIMER_CLK_FREQ/ for the
 arch-timer clk speed on sun7i to fix mis-compile on sun7i]
Acked-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

"adr rX, text_end" only works if the label is close. Adding further code
to the other functions will prevent this. So move the containing
function close to label. No functional change.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Acked-by: NIan Campbell <ijc@hellion.org.uk>

Based on the original version by Marc Zyngier. It adds a psci_cpu_off
implementation for the A20 SoC. The mechanism works by first preparing
the calling CPU to go offline (disable and flush cache, disable SMP),
then requesting CPU 0 to pull the plug. The request is sent as FIQ on
SGI15.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Acked-by: NIan Campbell <ijc@hellion.org.uk>

0x400 is true 1K.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NIan Campbell <ijc@hellion.org.uk>

Not used atm, for future use (e.g. PSCI).
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Acked-by: NIan Campbell <ijc@hellion.org.uk>

So far, only supporting the CPU_ON method.
Other functions can be added later.
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Acked-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>