ICX: platform/x86: ISST: Add Intel Speed Select mailbox interface via PCI
commit 31a166fe9c269af17977e650846ee4ea50361c07 upstream. Add an IOCTL to send mailbox commands to PUNIT using PUNIT PCI device. A limited set of mailbox commands can be sent to PUNIT. This MMIO interface is used by the intel-speed-select tool under tools/x86/power to enumerate and control Intel Speed Select features. The MBOX commands ids and semantics of the message can be checked from the source code of the tool. Signed-off-by: NSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NYouquan Song <youquan.song@intel.com> Signed-off-by: NJeffle Xu <jefflexu@linux.alibaba.com> Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com> Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>
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