549b1b1ebf
BHND Wi-Fi chipsets and SoCs share a common DMA engine, operating within backplane address space. To support host DMA on Wi-Fi chipsets, the bridge core maps host address space onto the backplane; any host addresses must be translated to their corresponding backplane address. - Defines a new bhnd_get_dma_translation(9) API to support querying DMA address translation parameters from the bhnd(4) bus. - Extends bhndb(4) to provide DMA translation descriptors from a DMA address translation table defined in the host bridge-specific bhndb_hwcfg. - Defines bhndb(4) DMA address translation tables for all supported host bridge cores. - Extends mips/broadcom's bhnd_nexus driver to return an identity (no-op) DMA translation descriptor; no translation is required when addressing the SoC backplane. Approved by: adrian (mentor) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D12582
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