Commit Graph

15 Commits

Author SHA1 Message Date
Jared McNeill
319336a943 Add generic device-tree cpufreq driver.
This driver supports two bindings:
 - cpufreq-dt: systems which share clock and voltage across all CPUs
 - arm_big_little_dt: systems which share clock and voltage across all
   CPUs in a single cluster

Reviewed by:		andrew, imp
Relnotes:		yes
Differential Revision:	https://reviews.freebsd.org/D7741
2016-09-06 20:43:26 +00:00
John Baldwin
7ad65edee3 Add a quirk to disable this driver for certain older laptops with an ICH2
southbridge and an Intel 82815_MC host bridge where the host bridge's
revision is less than 5.

Tested by:	mi
MFC after:	1 week
2013-02-26 18:30:47 +00:00
Sofian Brabez
61bfd86762 Use DEVMETHOD_END macro defined in sys/bus.h instead of {0, 0} sentinel on device_method_t arrays
Reviewed by:	cognet
Approved by:	cognet
2013-01-30 18:01:20 +00:00
John Baldwin
bc136b187d Attach the cpufreq child devices with specific orders to enforce relative
priority of some of the drivers that manage the same state (e.g. ichss0
vs est0).  Specifically, powernow, est, and p4tcc are added at order 10,
ichss at order 20, and smist at order 30.  Previously, some laptops were
seeing both ichss0 and est0 attaching and stomping on each other.

XXX: This isn't quite ideal, but works with the existing hacks, I think
what we really want instead is a single "speedstep0" device for CPUs
that the ichss, est, and smist drivers probe (but with differing
priorities).

MFC after:	1 week
2008-08-13 16:09:40 +00:00
John Baldwin
463e0f91cb Probe CPUs after the PCI hierarchy on i386, amd64, and ia64. This allows
the cpufreq drivers to reliably use properties of PCI devices for quirks,
etc.
- For the legacy drivers, add CPU devices via an identify routine in the
  CPU driver itself rather than in the legacy driver's attach routine.
- Add CPU devices after Host-PCI bridges in the acpi bus driver.
- Change the ichss(4) driver to use pci_find_bsf() to locate the ICH and
  check its device ID rather than having a bogus PCI attachment that only
  checked for the ID in probe and always failed.  As a side effect, you
  can now kldload ichss after boot.
- Fix the ichss(4) driver to use the correct device_t for the ICH (and not
  for ichss0) when doing PCI config space operations to enable SpeedStep.

MFC after:	2 weeks
Reviewed by:	njl, Andriy Gapon  avg of icyb.net.ua
2008-03-10 22:18:07 +00:00
Poul-Henning Kamp
c40da00ca3 Since DELAY() was moved, most <machine/clock.h> #includes have been
unnecessary.
2006-05-16 14:37:58 +00:00
Nate Lawson
823d404a6d Only activate ICH speedstep if we're going to use it. No bugs were observed
due to this but it's cleaner this way.
2005-03-20 01:25:21 +00:00
Nate Lawson
97d31723e7 Make a pass through all drivers checking specs for desired behavior on
SMP systems.  It appears all drivers except ichss should attach to each
CPU and that settings should be performed on each CPU.  Add comments about
this.  Also, add a guard for p4tcc's identify method being called more than
once.
2005-02-27 02:43:02 +00:00
Nate Lawson
0dc1b976eb Support disabling individual cpufreq drivers with hints, e.g.,
hint.ichss.0.disabled="1"
2005-02-22 06:31:45 +00:00
Nate Lawson
a47331bb73 Don't attach ichss if est is present. On systems that seem to support both,
the multi-setting EST is preferable.
2005-02-20 23:41:20 +00:00
Nate Lawson
e94a0c1a18 Introduce a new method, cpufreq_drv_type(), that returns the type of the
driver.  This used to be handled by cpufreq_drv_settings() but it's
useful to get the type/flags separately from getting the settings.
(For example, you don't have to pass an array of cf_setting just to find
the driver type.)

Use this new method in our in-tree drivers to detect reliably if acpi_perf
is present and owns the hardware.  This simplifies logic in drivers as well
as fixing a bug introduced in my last commit where too many drivers attached.
2005-02-18 00:23:36 +00:00
Nate Lawson
6655857ec7 Fix the check for acpi_perf(4) so that we verify if it is fully attached
or just offering info.  In the former case, we don't probe/attach to allow
the ACPI driver precedence.  A refinement of this would be to actually
use the info provided by acpi_perf(4) to get the real CPU clock rates
instead of estimating them but since all systems that support both
acpi_perf(4) and ichss(4) export the control registers to acpi_perf(4),
it can just handle the registers on its own.
2005-02-17 01:01:40 +00:00
Nate Lawson
0a9145a2f2 Use intr_disable/restore() instead of disable_intr() since the latter is
not MI.  This should fix build on non i386 platforms.
2005-02-05 16:31:58 +00:00
Warner Losh
c4241acbb3 Don't rely on indirect inclusion of machine/bus.h to use
bus_space_{read,write}_* routines.  This doesn't matter in the current
tree, but will matter soon (the rest of the tree appears to already be
clean).
2005-02-04 17:33:31 +00:00
Nate Lawson
6c7b11ccfa Add a cpufreq driver for the SpeedStep capability in the ICH chipset. This
driver offers two settings.  Information for this driver was obtained from
the Intel datasheets and by reviewing the Linux driver.
2005-02-04 05:42:29 +00:00