1 files changed, 82 insertions, 0 deletions
diff --git a/src/arch/loong64/include/ipxe/loong64_io.h b/src/arch/loong64/include/ipxe/loong64_io.h
new file mode 100644
index 00000000..939fbf2b
--- /dev/null
+++ b/src/arch/loong64/include/ipxe/loong64_io.h
@@ -0,0 +1,82 @@
+#ifndef _IPXE_LOONG64_IO_H
+#define _IPXE_LOONG64_IO_H
+
+/** @file
+ *
+ * iPXE I/O API for LoongArch64
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#ifdef IOAPI_LOONG64
+#define IOAPI_PREFIX_loong64
+#else
+#define IOAPI_PREFIX_loong64 __loong64_
+#endif
+
+#include <ipxe/dummy_pio.h>
+
+/*
+ * Memory space mappings
+ *
+ */
+
+/*
+ * Physical<->Bus address mappings
+ *
+ */
+
+static inline __always_inline unsigned long
+IOAPI_INLINE ( loong64, phys_to_bus ) ( unsigned long phys_addr ) {
+	return phys_addr;
+}
+
+static inline __always_inline unsigned long
+IOAPI_INLINE ( loong64, bus_to_phys ) ( unsigned long bus_addr ) {
+	return bus_addr;
+}
+
+/*
+ * MMIO reads and writes up to native word size
+ *
+ */
+
+#define LOONG64_READX( _suffix, _type, _insn_suffix )			      \
+static inline __always_inline _type					      \
+IOAPI_INLINE ( loong64, read ## _suffix ) ( volatile _type *io_addr ) {	      \
+	_type data;							      \
+	__asm__ __volatile__ ( "ld." _insn_suffix " %0, %1"		      \
+			       : "=r" ( data ) : "m" ( *io_addr ) );	      \
+	return data;							      \
+}
+LOONG64_READX ( b, uint8_t, "bu");
+LOONG64_READX ( w, uint16_t, "hu");
+LOONG64_READX ( l, uint32_t, "wu");
+LOONG64_READX ( q, uint64_t, "d");
+
+#define LOONG64_WRITEX( _suffix, _type, _insn_suffix )			      \
+static inline __always_inline void					      \
+IOAPI_INLINE ( loong64, write ## _suffix ) ( _type data,		      \
+					     volatile _type *io_addr ) {      \
+	__asm__ __volatile__ ( "st." _insn_suffix " %0, %1"		      \
+			       : : "r" ( data ), "m" ( *io_addr ) );	      \
+}
+LOONG64_WRITEX ( b, uint8_t, "b");
+LOONG64_WRITEX ( w, uint16_t, "h");
+LOONG64_WRITEX ( l, uint32_t, "w" );
+LOONG64_WRITEX ( q, uint64_t, "d");
+
+/*
+ * Memory barrier
+ *
+ */
+static inline __always_inline void
+IOAPI_INLINE ( loong64, mb ) ( void ) {
+	__asm__ __volatile__ ( "dbar 0" );
+}
+
+/* Dummy PIO */
+DUMMY_PIO ( loong64 );
+
+#endif /* _IPXE_LOONG64_IO_H */