thunderbolt: Add support for NHI mailbox
The host controller includes two sets of registers that are used to communicate with the firmware. Add functions that can be used to access these registers. This code is based on the work done by Amir Levy and Michael Jamet. Signed-off-by: NMichael Jamet <michael.jamet@intel.com> Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: NYehezkel Bernat <yehezkel.bernat@intel.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NAndreas Noever <andreas.noever@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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