net: ipa: introduce ipa_reg field masks
Add register field descriptors to the ipa_reg structure. A field in a register is defined by a field mask, which is a 32-bit mask having a single contiguous range of bits set. For each register that has at least one field defined, an enumerated type will identify the register's fields. The ipa_reg structure for that register will include an array fmask[] of field masks, indexed by that enumerated type. Each field mask defines the position and bit width of a field. An additional "fcount" records how many fields (masks) are defined for a given register. Introduce two macros to be used to define registers that have at least one field. Introduce a few new functions related to field masks. The first simply returns a field mask, given an IPA register pointer and field mask ID. A variant of that is meant to be used for the special case of single-bit field masks. Next, ipa_reg_encode(), identifies a field with an IPA register pointer and a field ID, and takes a value to represent in that field. The result encodes the value in the appropriate place to be stored in the register. This is roughly modeled after the bitmask operations (like u32_encode_bits()). Another function (ipa_reg_decode()) similarly identifies a register field, but the value supplied to it represents a full register value. The value encoded in the field is extracted from the value and returned. This is also roughly modeled after bitmask operations (such as u32_get_bits()). Finally, ipa_reg_field_max() returns the maximum value representable by a field. Signed-off-by:Alex Elder <elder@linaro.org> Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
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6a244b75
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