src/sys/dev/ofw/ofw_cpu.c, branch release/12.4.0

ofw_cpu: Add support for getting cpu clock via clock property

2018-07-31T20:50:50+00:00

Nominal Mhz is either expressed via the clock-frequency property
or can be get via the clock property that holds the cpu clock.
Add support for the later.

Reviewed by:	nwhitehorn
Differential Revision:	https://reviews.freebsd.org/D16346

Attach dev.cpu nodes on powerpc SMT cores, using only the first found thread

2018-06-20T13:30:35+00:00

Summary: In order to use cpufreq(4), a dev.cpu attachment must be created.  If
the IBM property is found denoting SMT, attach only to the first thread setup,
so that a cpufreq device can bind.

Reviewed by:	nwhitehorn
Differential Revision: https://reviews.freebsd.org/D15921

Do not bind to CPUs with SMT, which use a different CPU numbering convention

2017-11-25T21:46:51+00:00

that does not play well with this driver.

MFC after:	2 weeks

Update comment ot reflect realilty, we know also take care of CPUs that

2017-04-20T15:06:16+00:00

provide a enable-method.

Suggested by:	jhibbits

ePAPR states that any non-boot CPU will come in "disabled" state. So we should

2017-04-20T13:56:06+00:00

not consider a "disabled" cpu as a CPU we have to ignore, and we should use
them if they provide a "enable-method".
While I'm there, support "ok" as well as "okay", while ePAPR only accepts
"okay", linux accepts "ok" too so we can expect it to be used.

Reviewed by:	andrew (partially)

Limit ofw_cpu_early_foreach() to CPUs only

2015-07-28T13:16:08+00:00

On some platforms, the /cpus node contains cpu-to-cluster
map which deffinitely is not a CPU node. Its presence was
causing incrementing of "id" variable and reporting more
CPUs available than it should.
To make "id" valid, increment it only when an entry really
is a CPU device.

Reviewed by:   andrew
Obtained from: Semihalf
Sponsored by:  The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3216

Adda function to iterate over the cpu nodes in the OFW or FDT data. This

2015-02-19T16:34:48+00:00

will be used with arm64 to find which cpus to enable, and could also be
used with 32-bit arm and mips for the same purpose.

Differential Revision:	https://reviews.freebsd.org/D1825
Sponsored by:	The FreeBSD Foundation

Add support to get the cpu ID from its device driver in a generic way.

2015-02-19T12:47:48+00:00

This will be needed by arm64 to find the value to pass to the psci (Power
State Coordination Interface) driver, among other things, used to enable
cores.

Differential Revision:	https://reviews.freebsd.org/D1824
Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation

Update the parsing of the cpu node. We are unable to use the reg property

2015-01-21T16:52:24+00:00

as the cpu id on arm64 as it may use two cells. In it's place we can use
the device id.

It is expected we will use the reg data on arm64 to enable cores so we
still need to read and store it even if it is not yet used.

Differential Revision:	https://reviews.freebsd.org/D1555
Reviewed by:	nwhitehorn
Sponsored by:	The FreeBSD Foundation

Make the clock-frequency property optional as it may not be present on FDT

2015-01-19T11:06:56+00:00

systems.

Sponsored by:	The FreeBSD Foundation