net: ethernet: ti: cpsw_ale: Add cpsw_ale_restore() helper

This can be used by device driver to restore ALE context.
The data produced by cpsw_ale_dump() can be passed to
cpsw_ale_restore().

This is required as on certain platforms the ALE context
is lost on low power suspend/resume.
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpsw_ale.c

@@ -1452,6 +1452,16 @@ void cpsw_ale_dump(struct cpsw_ale *ale, u32 *data)
 	}
 }
 
+void cpsw_ale_restore(struct cpsw_ale *ale, u32 *data)
+{
+	int i;
+
+	for (i = 0; i < ale->params.ale_entries; i++) {
+		cpsw_ale_write(ale, i, data);
+		data += ALE_ENTRY_WORDS;
+	}
+}
+
 u32 cpsw_ale_get_num_entries(struct cpsw_ale *ale)
 {
 	return ale ? ale->params.ale_entries : 0;

drivers/net/ethernet/ti/cpsw_ale.h

@@ -127,6 +127,7 @@ int cpsw_ale_control_get(struct cpsw_ale *ale, int port, int control);
 int cpsw_ale_control_set(struct cpsw_ale *ale, int port,
 			 int control, int value);
 void cpsw_ale_dump(struct cpsw_ale *ale, u32 *data);
+void cpsw_ale_restore(struct cpsw_ale *ale, u32 *data);
 u32 cpsw_ale_get_num_entries(struct cpsw_ale *ale);
 
 static inline int cpsw_ale_get_vlan_p0_untag(struct cpsw_ale *ale, u16 vid)