All ARMv5 and older CPUs invalidate their caches in the early assembly
setup function, prior to enabling the MMU. This is because the L1
cache should not contain any data relevant to the execution of the
kernel at this point; all data should have been flushed out to memory.
This requirement should also be true for ARMv6 and ARMv7 CPUs - indeed,
these typically do not search their caches when caching is disabled (as
it needs to be when the MMU is disabled) so this change should be safe.
ARMv7 allows there to be CPUs which search their caches while caching is
disabled, and it's permitted that the cache is uninitialised at boot;
for these, the architecture reference manual requires that an
implementation specific code sequence is used immediately after reset
to ensure that the cache is placed into a sane state. Such
functionality is definitely outside the remit of the Linux kernel, and
must be done by the SoC's firmware before _any_ CPU gets to the Linux
kernel.
Changing the data cache clean+invalidate to a mere invalidate allows us
to get rid of a lot of platform specific hacks around this issue for
their secondary CPU bringup paths - some of which were buggy.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Thierry Reding <treding@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Tested-by: Wei Xu <xuwei5@hisilicon.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
The changes here belong to two main platforms:
- Atmel At91 is flipping the bit and going multiplatform. This includes some
cleanups and removal of code, and the final flip of config dependencies
- Shmobile has several platforms that are going multiplatform, but this
branch also contains a bunch of cleanups that they weren't able to keep
separate in a good way. THere's also a removal of one of their SoCs and the
corresponding boards (sh7372 and mackerel).
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Merge tag 'armsoc-multiplatform' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC multiplatform code changes from Olof Johansson:
"The changes here belong to two main platforms:
- Atmel At91 is flipping the bit and going multiplatform. This
includes some cleanups and removal of code, and the final flip of
config dependencies
- Shmobile has several platforms that are going multiplatform, but
this branch also contains a bunch of cleanups that they weren't
able to keep separate in a good way. THere's also a removal of one
of their SoCs and the corresponding boards (sh7372 and mackerel)"
* tag 'armsoc-multiplatform' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (67 commits)
ARM: at91/pm: move AT91_MEMCTRL_* to pm.h
ARM: at91/pm: move the standby functions to pm.c
ARM: at91: fix pm_suspend.S compilation when ARMv6 is selected
ARM: at91: add a Kconfig dependency on multi-platform
ARM: at91: drop AT91_TIMER_HZ
ARM: at91: remove hardware.h
ARM: at91: remove SoC headers
ARM: at91: remove useless mach/cpu.h
ARM: at91: remove unused headers
ARM: at91: switch at91_dt_defconfig to multiplatform
ARM: at91: switch to multiplatform
ARM: shmobile: r8a7778: enable multiplatform target
ARM: shmobile: bockw: add sound to DT
ARM: shmobile: r8a7778: add sound to DT
ARM: shmobile: bockw: add devices hooked up to i2c0 to DT
DT: i2c: add trivial binding for OKI ML86V7667 video decoder
ARM: shmobile: r8a7778: common clock framework CPG driver
ARM: shmobile: bockw dts: set extal clock frequency
ARM: shmobile: bockw dts: Move Ethernet node to BSC
ARM: shmobile: r8a73a4: Remove legacy code
...
The default idle driver uses one state with the WFI instruction.
The default idle routine invokes WFI when no cpuidle driver is present.
The default cpuidle driver is pointless and does not give more than the
default idle routine and moreover it pulls all the mathematics tied with
the cpuidle governor for nothing, hence consuming more energy.
Remove the default driver, the related code and register the driver directly.
[compiled only - no board - no test]
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Remove support for the legacy Cortex-A8 based sh7372 SoC.
The Linux kernel still lacks DT bindings for the sh7372 INTC
interrupt controller so DT multiplatform support is not possibile.
Also, the sh7372 SoC never went into mass production anyway so to
aid migration to DT multiplatform simply get rid of sh7372 support.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
APMU resources are not common to all R-Car SoCs so don't share this data.
A subsequent patch will correct the CPU cores for the r8a7791.
Signed-off-by: Hisashi Nakamura <hisashi.nakamura.ak@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
All ARM mach-shmobile SoCs and boards now rely on DTS for
CPU Frequency information, so remove the unused function
shmobile_setup_delay(). While at it, make the function
shmobile_setup_delay_hz() static.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
* Use shmobile_init_late on r8a7791 and r8a7790 whien booting using DT-only
* Support Core-Standby for Suspend to RAM on r8a7791 and r8a7790 SoCs
* Shared CMA reservation for R-Car Gen2 SoCs
* Add r8a7791 SYSC power management support
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Merge tag 'renesas-soc-for-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc
Merge "Renesas ARM Based SoC Updates for v3.17" from Simon Horman:
- Use shmobile_init_late on r8a7791 and r8a7790 whien booting using DT-only
- Support Core-Standby for Suspend to RAM on r8a7791 and r8a7790 SoCs
- Shared CMA reservation for R-Car Gen2 SoCs
- Add r8a7791 SYSC power management support
* tag 'renesas-soc-for-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
ARM: shmobile: Remove ARCH_HAS_CPUFREQ config for shmobile
ARM: shmobile: rcar-gen2: update call to dma_contiguous_reserve_area
ARM: shmobile: rcar-gen2: correct return value of shmobile_smp_apmu_suspend_init
ARM: shmobile: rcar-gen2: Remove useless copied section for LongTrail
ARM: shmobile: rcar-gen2: Use "1ULL" instead of "(u64)1"
ARM: shmobile: rcar-gen2: Update for of_get_flat_dt_prop() update
ARM: shmobile: Add shared R-Car Gen2 CMA reservation code
ARM: shmobile: Use shmobile_init_late() on r8a7791 DT-only
ARM: shmobile: Use shmobile_init_late() on r8a7790 DT-only
ARM: shmobile: Mark all SoCs in shmobile as CPUFreq, capable
ARM: shmobile: r8a7791: Support Core-Standby for Suspend to RAM
ARM: shmobile: r8a7790: Support Core-Standby for Suspend to RAM
ARM: shmobile: APMU: Add Core-Standby-state for Suspend to RAM
ARM: shmobile: r8a7791 SYSC setup code
Signed-off-by: Olof Johansson <olof@lixom.net>
Move r8a7779 SoC and its Marzen board to use common clocks,
multiplatform and initialise SCIF (serial) devices using DT.
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Merge tag 'renesas-r8a7779-multiplatform-for-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc
Pull "Renesas ARM Based SoC r8a7779-multiplatform Updates for v3.17" from
Simon Horman:
Move r8a7779 SoC and its Marzen board to use common clocks,
multiplatform and initialise SCIF (serial) devices using DT.
* tag 'renesas-r8a7779-multiplatform-for-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas: (32 commits)
ARM: shmobile: marzen: Do not use workaround for scif devices
ARM: shmobile: marzen: Initialise SCIF devices using DT
ARM: shmobile: marzen: Remove early_printk from command line
ARM: shmobile: r8a7779: Add scif nodes to dtsi
ARM: shmobile: r8a7779 dtsi: Correct #address-cells/#size-cells for clocks
ARM: shmobile: r8a7779 dtsi: Update unit-addresses for clocks
ARM: shmobile: r8a7779: Remove unused r8a7779_init_delay()
ARM: shmobile: marzen-reference: Use DT CPU Frequency
ARM: shmobile: r8a7779: Use DT CPU Frequency in common case
ARM: shmobile: r8a7779: Add Maximum CPU Frequency to DTS
ARM: shmobile: marzen-reference: Remove legacy clock support
ARM: shmobile: Remove Marzen reference DTS
ARM: shmobile: Let Marzen multiplatform boot with Marzen DTB
ARM: shmobile: Remove non-multiplatform Marzen reference support
ARM: shmobile: marzen-reference: Instantiate clkdevs for SCIF and TMU
ARM: shmobile: marzen-reference: Initialize CPG device
ARM: shmobile: r8a7779: Initial multiplatform support
ARM: shmobile: marzen-reference: Move clock and OF device initialisation into board code
ARM: shmobile: r8a7779: Move r8a7779_earlytimer_init to clock-r8a7779.c
ARM: shmobile: r8a7779: Add helper to read mode pins
...
Signed-off-by: Olof Johansson <olof@lixom.net>
The dummy shmobile_smp_apmu_suspend_init() function provided when
CPU_IDLE is not set should not return a value as per the signature
of the function.
This problem appears to have been introduced by
867ba81f728f1daa ("ARM: shmobile: APMU: Add Core-Standby-state for Suspend
to RAM").
Cc: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This patch add Core-Standby-state for Suspend to RAM.
Signed-off-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Acked-by: Magnus Damm <damm+renesas@opensource.se>
[horms+renesas@verge.net.au: rebase]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Change location for common.h so it can be used as #include "common.h"
instead of the old style #include <mach/common.h>.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Russell King