1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/net/octeontx2/lmt.h b/drivers/net/octeontx2/lmt.h
new file mode 100644
index 0000000000..84a7eab814
--- /dev/null
+++ b/drivers/net/octeontx2/lmt.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier:    GPL-2.0
+ *
+ * Copyright (C) 2018 Marvell International Ltd.
+ */
+
+/**
+ * Atomically adds a signed value to a 64 bit (aligned) memory location,
+ * and returns previous value.
+ *
+ * This version does not perform 'sync' operations to enforce memory
+ * operations.  This should only be used when there are no memory operation
+ * ordering constraints.  (This should NOT be used for reference counting -
+ * use the standard version instead.)
+ *
+ * @param ptr    address in memory to add incr to
+ * @param incr   amount to increment memory location by (signed)
+ *
+ * @return Value of memory location before increment
+ */
+static inline s64 atomic_fetch_and_add64_nosync(s64 *ptr, s64 incr)
+{
+	s64 result;
+	/* Atomic add with no ordering */
+	asm volatile("ldadd %x[i], %x[r], [%[b]]"
+		     : [r] "=r" (result), "+m" (*ptr)
+		     : [i] "r" (incr), [b] "r" (ptr)
+		     : "memory");
+	return result;
+}
+
+static inline void lmt_cancel(const struct nix *nix)
+{
+	writeq(0, nix->lmt_base + LMT_LF_LMTCANCEL());
+}
+
+static inline u64 *lmt_store_ptr(struct nix *nix)
+{
+	return (u64 *)((u8 *)(nix->lmt_base) +
+				       LMT_LF_LMTLINEX(0));
+}
+
+static inline s64 lmt_submit(u64 io_address)
+{
+	s64 result = 0;
+
+	asm volatile("ldeor xzr, %x[rf],[%[rs]]"
+			: [rf] "=r"(result) : [rs] "r"(io_address));
+	return result;
+}