| aca95fb6 | 31-Jan-2025 |
Paul Mackerras <[email protected]> |
powerpc/microwatt: Add SMP support
This adds support for Microwatt systems with more than one core, and
updates the device tree for a 2-core version.
The secondary CPUs are started and sent to spin
powerpc/microwatt: Add SMP support
This adds support for Microwatt systems with more than one core, and
updates the device tree for a 2-core version.
The secondary CPUs are started and sent to spin in __secondary_hold
very early on, in the platform probe function. The reason for doing
this is so that they are there when smp_release_cpus() gets called,
which is before the platform init_smp function or even the platform
setup_arch function gets called.
Note that having two CPUs in the device tree doesn't preclude
operation with only one CPU. The SYSCON_CPU_CTRL register has a
read-only field which indicates the number of CPU cores, so
microwatt_init_smp() will only start as many CPU cores as are present
in the system, and any extra CPU device-tree nodes will just be
ignored.
Signed-off-by: Paul Mackerras <[email protected]>
Signed-off-by: Madhavan Srinivasan <[email protected]>
Link: https://patch.msgid.link/[email protected]
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