platform/x86: ISST: Add Intel Speed Select mmio interface

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Added MMIO interface to read/write specific offsets in PUNIT PCI device
which export core priortization. This MMIO interface can be used using
ioctl interface on /dev/isst_interface using IOCTL ISST_IF_IO_CMD.

This MMIO interface is used by the intel-speed-select tool under
tools/x86/power to enumerate and set core priority. The MMIO offsets and
semantics of the message can be checked from the source code of the tool.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

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Srinivas Pandruvada 2019-06-26 15:38:46 -07:00 • committed by Andy Shevchenko

parent fb5b36a413

commit d3a2358429

5 changed files with 173 additions and 0 deletions

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1

drivers/platform/x86/intel_speed_select_if/Makefile

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6

drivers/platform/x86/intel_speed_select_if/isst_if_common.c

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2

drivers/platform/x86/intel_speed_select_if/isst_if_common.h

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131

drivers/platform/x86/intel_speed_select_if/isst_if_mmio.c

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33

include/uapi/linux/isst_if.h

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