1 files changed, 42 insertions, 0 deletions
diff --git a/src/include/bits/ns16550.h b/src/include/bits/ns16550.h
new file mode 100644
index 000000000..45e3e978f
--- /dev/null
+++ b/src/include/bits/ns16550.h
@@ -0,0 +1,42 @@
+#ifndef _BITS_NS16550_H
+#define _BITS_NS16550_H
+
+/** @file
+ *
+ * 16550-compatible UART
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <ipxe/io.h>
+
+/**
+ * Write to UART register
+ *
+ * @v ns16550		16550 UART
+ * @v address		Register address
+ * @v data		Data
+ */
+static inline __attribute__ (( always_inline )) void
+ns16550_write ( struct ns16550_uart *ns16550, unsigned int address,
+		uint8_t data ) {
+
+	iowrite8 ( data, ( ns16550->base + ( address << ns16550->shift ) ) );
+}
+
+/**
+ * Read from UART register
+ *
+ * @v ns16550		16550 UART
+ * @v address		Register address
+ * @ret data		Data
+ */
+static inline __attribute__ (( always_inline )) uint8_t
+ns16550_read ( struct ns16550_uart *ns16550, unsigned int address ) {
+
+	return ioread8 ( ns16550->base + ( address << ns16550->shift ) );
+}
+
+#endif /* _BITS_NS16550_H */