1 files changed, 61 insertions, 0 deletions
diff --git a/src/include/device/dram/rcd.h b/src/include/device/dram/rcd.h
new file mode 100644
index 0000000000..d0b1f2c031
--- /dev/null
+++ b/src/include/device/dram/rcd.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef DEVICE_DRAM_RCD_H
+#define DEVICE_DRAM_RCD_H
+
+#include <types.h>
+#include <device/i2c_simple.h>
+#include <console/console.h>
+
+enum rcw_idx {
+	VEN_ID_L,
+	VEN_ID_H,
+	DEV_ID_L,
+	DEV_ID_H,
+	REV_ID,
+	RES_05,
+	RES_06,
+	RES_07,
+	F0RC00_01,
+	F0RC02_03,
+	F0RC04_05,
+	F0RC06_07,
+	F0RC08_09,
+	F0RC0A_0B,
+	F0RC0C_0D,
+	F0RC0E_0F,
+	F0RC1x,
+	F0RC2x,
+	F0RC3x,
+	F0RC4x,
+	F0RC5x,
+	F0RC6x,
+	F0RC7x,
+	F0RC8x,
+	F0RC9x,
+	F0RCAx,
+	F0RCBx,
+	F0RCCx,
+	F0RCDx,
+	F0RCEx,
+	F0RCFx,
+	RCW_ALL,	/* Total num of bytes */
+	RCW_ALL_ALIGNED	/* Total num of bytes after aligning to 4B */
+};
+
+_Static_assert(RCW_ALL_ALIGNED % sizeof(uint32_t) == 0,
+	       "RCW_ALL_ALIGNED is not aligned");
+
+/* Write an 8-bit register. Returns the number of written bytes. */
+int rcd_write_reg(unsigned int bus, uint8_t slave, enum rcw_idx reg,
+		  uint8_t data);
+
+/* Write 32 bits of memory (i.e., four 8-bit registers, not 1 32-bit register, which would
+ * involve byte swapping). Returns the number of written bytes. */
+int rcd_write_32b(unsigned int bus, uint8_t slave, enum rcw_idx reg,
+		  uint32_t data);
+
+/* Dump 32 bytes of RCD onto the screen. */
+void dump_rcd(unsigned int bus, uint8_t addr);
+
+#endif /* DEVICE_DRAM_RCD_H */