The pen_release implementation was created for Versatile platforms to
work around boot loaders that did not differentiate between the
various different secondary CPUs on this ARM development platform.
This should not be true of modern platforms where we send IPIs to
specific CPUs to wake them up. Remove the pen_release stuff from
SoCs that make use of the per-CPU IPI mechanism.
The boot_lock is something that was required for ARM development
platforms to ensure that the delay calibration worked properly. This
is not necessary for modern platforms that have better bus bandwidth
and do not need to calibrate the delay loop for secondary cores.
Remove the boot_lock entirely.
Due to pen_release and boot_lock removal, .smp_prepare_cpus and
.smp_boot_secondary STi callbacks must be reworked properly to
allow secondary CPU bring up.
Secondary CPU is initialized and started by a U-BOOTROM firmware.
Secondary CPU is spinning and waiting for a write at cpu_strt_ptr.
Writing secondary_startup address at cpu_strt_ptr makes it to
jump directly to secondary_startup().
This write must be done in .smp_boot_secondary callback and not
in .smp_prepare_cpus as previously, this insures that secondary_data
struct is populated in __cpu_up() (stack, pgdir and swapper_pg_dir fields).
The IPI in sti_boot_secondary() is useless, so remove it.
This patch is the merged of Russell's patch [1] and the rework of
.smp_prepare_cpus and .smp_boot_secondary STi callbacks [2].
[1] https://patchwork.kernel.org/patch/10729435/
[2] https://patchwork.kernel.org/patch/10735795/
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
All low-level PM/SMP code using virt_to_phys() should actually use
__pa_symbol() against kernel symbols. Update code where relevant to move
away from virt_to_phys().
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Calling trace_hardirqs_off() from the platform specific
secondary startup code as not been necessary since Dec 2010
when Russell King consolidated the call into the common SMP
code.
2c0136d ARM: SMP: consolidate trace_hardirqs_off() into common SMP code
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Most upstream devs boot STi platform via JTAG which abuses the
boot process by setting the PC of secondary cores directly. As
a consquence, booting STi platforms via u-boot results in only
the primary core being brought up as the code to manage the
holding pen is not upstream.
This patch adds the necessary code to bring the secondary cores
out of the holding pen. It uses the cpu-release-addr DT property
to get the address of the holding pen from the bootloader.
With this patch booting upstream kernels via u-boot works
correctly:
[ 0.045456] CPU: Testing write buffer coherency: ok
[ 0.045597] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[ 0.045734] Setting up static identity map for 0x40209000 - 0x40209098
[ 0.065047] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[ 0.065081] Brought up 2 CPUs
[ 0.065089] SMP: Total of 2 processors activated (5983.43 BogoMIPS).
[ 0.065092] CPU: All CPU(s) started in SVC mode.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Symbols local to this file are made static.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Cc: kernel@stlinux.com
Cc: Srinivas Kandagatla <srinivas.kandagatla@gmail.com>
Cc: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
We have a handy macro to replace open coded __cpuc_flush_dcache_area(()
and outer_clean_range() sequences. Let's use it. No functional change.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings. In any case, they are temporary and harmless.
This removes all the ARM uses of the __cpuinit macros from C code,
and all __CPUINIT from assembly code. It also had two ".previous"
section statements that were paired off against __CPUINIT
(aka .section ".cpuinit.text") that also get removed here.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
The STiH415 is the next generation of HD, AVC set-top box processors for
satellite, cable, terrestrial and IP-STB markets. It is an ARM Cortex-A9
1.0 GHz, dual-core CPU.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
CC: Stephen Gallimore <stephen.gallimore@st.com>
CC: Stuart Menefy <stuart.menefy@st.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Patrice Chotard
Florian Fainelli
Masahiro Yamada
Peter Griffin
Sachin Kamat
Nicolas Pitre
Paul Gortmaker
Srinivas Kandagatla