+#define OP_INV_IC 0x4
+
+/*
+ * Common Helper for Line Operations on {I,D}-Cache
+ */
+static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr,
+ unsigned long sz, const int cacheop)
+{
+ unsigned int aux_cmd, aux_tag;
+ int num_lines;
+
+ if (cacheop == OP_INV_IC) {
+ aux_cmd = ARC_REG_IC_IVIL;
+ aux_tag = ARC_REG_IC_PTAG;
+ }
+ else {
+ /* d$ cmd: INV (discard or wback-n-discard) OR FLUSH (wback) */
+ aux_cmd = cacheop & OP_INV ? ARC_REG_DC_IVDL : ARC_REG_DC_FLDL;
+ aux_tag = ARC_REG_DC_PTAG;
+ }
+
+ /* Ensure we properly floor/ceil the non-line aligned/sized requests
+ * and have @paddr - aligned to cache line and integral @num_lines.
+ * This however can be avoided for page sized since:
+ * -@paddr will be cache-line aligned already (being page aligned)
+ * -@sz will be integral multiple of line size (being page sized).
+ */
+ if (!(__builtin_constant_p(sz) && sz == PAGE_SIZE)) {
+ sz += paddr & ~CACHE_LINE_MASK;
+ paddr &= CACHE_LINE_MASK;
+ vaddr &= CACHE_LINE_MASK;
+ }
+
+ num_lines = DIV_ROUND_UP(sz, L1_CACHE_BYTES);
+
+#if (CONFIG_ARC_MMU_VER <= 2)
+ /* MMUv2 and before: paddr contains stuffed vaddrs bits */
+ paddr |= (vaddr >> PAGE_SHIFT) & 0x1F;
+#endif
+
+ while (num_lines-- > 0) {
+#if (CONFIG_ARC_MMU_VER > 2)
+ /* MMUv3, cache ops require paddr seperately */
+ write_aux_reg(ARC_REG_DC_PTAG, paddr);
+
+ write_aux_reg(aux_cmd, vaddr);
+ vaddr += L1_CACHE_BYTES;
+#else
+ write_aux_reg(aux, paddr);
+#endif
+ paddr += L1_CACHE_BYTES;
+ }
+}