1 files changed, 29 insertions, 0 deletions
diff --git a/cmd/sbc_harness/hw/w5500.h b/cmd/sbc_harness/hw/w5500.h
new file mode 100644
index 0000000..0f37797
--- /dev/null
+++ b/cmd/sbc_harness/hw/w5500.h
@@ -0,0 +1,29 @@
+#ifndef _HW_W5500_H_
+#define _HW_W5500_H_
+
+#include "hw/spi.h"
+
+struct w5500 {
+	struct spi *spidev;
+};
+
+/**
+ * Initialize a WIZnet W5500 Ethernet and TCP/IP-offload chip.
+ *
+ * The W5500 has 2 channels of communication with the MCU:
+ *
+ *  - An SPI-based RPC protocol:
+ *    + mode: mode 0 or mode 3
+ *    + bit-order: MSB-first
+ *    + clock frequency: 33.3MHz - 80MHz
+ *  - An interrupt pin that it pulls low when an event happens (to let
+ *    the MCU know that it should do an SPI RPC "get" to see what
+ *    happened.)
+ */
+#define w5500_init(self, name, spi, pin_intr) do {                       \
+		bi_decl(bi_1_pin_with_name(pin_intr, name" interrupt")); \
+		_w5500_init(self, spi, pin_intr);                        \
+	} while (0)
+void _w5500_init(struct w5500 *self, struct spi* spi, uint pin_intr);
+
+#endif /* _HW_W5500_H_ */