Hi all,
This patch series enables SMP on R-Car E2 (r8a7794).
The main hurdle here is that R-Car Gen2 boot loaders do not initialize the
arch_timer CNTVOFF register, which thus needs workarounds on Linux.
- The first patch adds a definition for MON_MODE, as suggested by Marc
Zyngier,
- The second patch makes sure CNTVOFF is initialized for boot and
secondary Cortex-A15 and Cortex-A7 CPU cores, like is already done
for the boot Cortex-A7 CPU core. Without this, the ARM arch timer
does not work on secondary CPU cores.
This patch depends on "[PATCH v2] ARM: shmobile: rcar-gen2: Correct
arch timer frequency on RZ/G1E".
- The third patch adds the required infrastructure (APMU device node
and corresponding enable-method) to DT.
Obviously this must not be applied on a branch that does not contain
the first two patches!
Due to dependencies, I think it is easiest if the ARM maintainers provide
their Acked-by for patch 1, so the whole series can go in through Simon's
Renesas tree.
Changes compared to v1:
- New patch "[PATCH v2 1/3] ARM: Add definition for monitor mode",
- Initialize CNTVOFF on Cortex-A15, too,
- Use *_MODE definitions instead of hardcoded values,
- Reduce duplication by calling the asm version from C,
- Always build headsmp-apmu.o on R-Car Gen2.
This has been tested on r8a7794/alt (dual Cortex-A7), and regression-tested
on r8a7790/lager (quad Cortex-A15), and r8a7791/koelsch, r8a7791/porter,
r8a7792/blanche, and r8a7793/gose (dual Cortex-A15).
Thanks!
Geert Uytterhoeven (2):
ARM: Add definition for monitor mode
ARM: shmobile: rcar-gen2: Make sure CNTVOFF is initialized on CA7/15
Sergei Shtylyov (1):
ARM: dts: r8a7794: Add SMP support
arch/arm/boot/dts/r8a7794.dtsi | 7 ++++++
arch/arm/include/uapi/asm/ptrace.h | 1 +
arch/arm/mach-shmobile/Makefile | 1 +
arch/arm/mach-shmobile/common.h | 2 ++
arch/arm/mach-shmobile/headsmp-apmu.S | 37 ++++++++++++++++++++++++++++++++
arch/arm/mach-shmobile/platsmp-apmu.c | 2 +-
arch/arm/mach-shmobile/setup-rcar-gen2.c | 20 ++---------------
7 files changed, 51 insertions(+), 19 deletions(-)
create mode 100644 arch/arm/mach-shmobile/headsmp-apmu.S
--
2.7.4
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
