MIPS: BMIPS: Add special cache handling in c-r4k.c
BMIPS435x and BMIPS438x have a single shared L1 D$ and load/store unit, so it isn't necessary to raise IPIs to keep both CPUs coherent. BMIPS5000 has VIPT L1 caches that handle aliases in hardware, and its I$ fills from D$. But a special sequence with 2 SYNCs and 32 NOPs is needed to ensure coherency. Signed-off-by: NKevin Cernekee <cernekee@gmail.com> Cc: f.fainelli@gmail.com Cc: mbizon@freebox.fr Cc: jogo@openwrt.org Cc: jfraser@broadcom.com Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/8165/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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