BMC/Intel-BMC/linux.git/arch/arm/kernel/smp_scu.c, branch dev-5.0

ARM: smp_scu: allow the platform code to read the SCU CPU status

2017-10-29T15:29:30+00:00

On Amlogic Meson8 / Meson8m2 (both Cortex-A9) and Meson8b (Cortex-A5) the CPU hotplug code needs to wait until the SCU status of the CPU that is being taken offline is SCU_PM_POWEROFF. Provide a utility function (which can be invoked for example from .cpu_kill()) which allows reading the SCU status of a CPU. While here, replace the magic number 0x3 with a preprocessor macro (SCU_CPU_STATUS_MASK) so we don't have to duplicate this magic number in the new function. Signed-off-by: Martin Blumenstingl Acked-by: Russell King Signed-off-by: Kevin Hilman

ARM: smp_scu: add a helper for powering on a specific CPU

2017-10-29T15:29:21+00:00

To boot the secondary CPUs on the Amlogic Meson8/Meson8m2 (Cortex-A9) and Meson8b (Cortex-A5) SoCs we have to enable SCU mode SCU_PM_NORMAL, otherwise the secondary cores will not start. This patch adds a scu_cpu_power_enable() function which can be used to enable SCU_PM_NORMAL for a specific (logical) CPU. An internal helper function is also created, to avoid code duplication with scu_power_mode(). Signed-off-by: Martin Blumenstingl Acked-by: Russell King Signed-off-by: Kevin Hilman

ARM: 8122/1: smp_scu: enable SCU standby support

2014-08-02T07:51:53+00:00

With SCU standby enabled, SCU CLK will be turned off when all processors are in WFI mode. And the clock will be turned on when any processor leaves WFI mode. This behavior should be preferable in terms of power efficiency of system idle. So let's set the SCU standby bit to enable the support in function scu_enable(). Cortex-A9 earlier than r2p0 has no standby bit in SCU, so we need to skip setting the bit for those. Signed-off-by: Shawn Guo Acked-by: Soren Brinkmann Signed-off-by: Russell King

ARM: 8121/1: smp_scu: use macro for SCU enable bit

2014-08-02T07:51:52+00:00

Use macro instead of magic number for SCU enable bit. Signed-off-by: Shawn Guo Acked-by: Soren Brinkmann Signed-off-by: Russell King

ARM: smp_scu: data endian fixes

2013-10-19T19:46:33+00:00

The smp_scu driver needs to use the relaxed readl/write accessors to avoid any issues with the endian mode the processor core is in. Reviewed-by: Will Deacon Signed-off-by: Ben Dooks

Merge branch 'for-next' of git://git.pengutronix.de/git/ukl/linux into devel-stable

2013-03-09T15:49:32+00:00

Conflicts: arch/arm/include/asm/cputype.h Signed-off-by: Russell King

ARM: use read_cpuid_id() instead of read_cpuid(CPUID_ID)

2013-01-31T20:44:47+00:00

Both calls are identical currently. This patch prepares to deprecate read_cpuid on machines without cp15. Also move an unconditional usage of read_cpuid_cachetype to a more local scope as read_cpuid_cachetype uses read_cpuid, too. Signed-off-by: Uwe Kleine-König Message-Id: 1359646587-1788-1-git-send-email-u.kleine-koenig@pengutronix.de

ARM: scu: mask cluster id from cpu_logical_map

2013-01-31T19:54:16+00:00

With commit a0ae0240 (ARM: kernel: add device tree init map function), the cpu id value may include the cluster id and is no longer 0-3, so we need to mask it in scu_power_mode to get the local cpu number. Since we are only dealing with the cpu we are running on, the cluster id should not ever be needed. Signed-off-by: Rob Herring

ARM: 7347/1: SCU: use cpu_logical_map for per-CPU low power mode

2012-04-28T16:31:37+00:00

scu_power_mode changes the power mode for the current CPU, which it determines from smp_processor_id(). However, this assumes that the physical CPU number is equal to Linux's logical CPU number and if this is not true, we will power off the wrong CPU. This patch uses cpu_logical_map to translate the logical CPU number into a physical one in scu_power_mode. Reported-by: Lorenzo Pieralisi Signed-off-by: Will Deacon Signed-off-by: Russell King

Merge branches 'arnd-randcfg-fixes', 'debug', 'io' (early part), 'l2x0', 'p2v', 'pgt' (early part) and 'smp' into for-linus

2011-10-25T07:19:29+00:00