MIPS: pgtable-bits: Define the CCA bit for WC writes on Ingenic cores

Ingenic uses the CCA:1 bit to achieve write-combine memory writes.
Signed-off-by: NMarkos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7401/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/pgtable-bits.h

@@ -240,6 +240,11 @@ static inline uint64_t pte_to_entrylo(unsigned long pte_val)
 #define _CACHE_CACHABLE_NONCOHERENT (3<<_CACHE_SHIFT)  /* LOONGSON       */
 #define _CACHE_CACHABLE_COHERENT    (3<<_CACHE_SHIFT)  /* LOONGSON-3     */
 
+#elif defined(CONFIG_MACH_JZ4740)
+
+/* Ingenic uses the WA bit to achieve write-combine memory writes */
+#define _CACHE_UNCACHED_ACCELERATED (1<<_CACHE_SHIFT)
+
 #endif
 
 #ifndef _CACHE_CACHABLE_NO_WA