1 files changed, 49 insertions, 0 deletions
diff --git a/src/soc/intel/alderlake/i2c.c b/src/soc/intel/alderlake/i2c.c
new file mode 100644
index 0000000000..ef34e2ef1c
--- /dev/null
+++ b/src/soc/intel/alderlake/i2c.c
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * This file is created based on Intel Alder Lake Processor PCH Datasheet
+ * Document number: 621483
+ * Chapter number: 13
+ */
+
+#include <device/device.h>
+#include <drivers/i2c/designware/dw_i2c.h>
+#include <soc/pci_devs.h>
+
+int dw_i2c_soc_devfn_to_bus(unsigned int devfn)
+{
+	switch (devfn) {
+	case PCH_DEVFN_I2C0:
+		return 0;
+	case PCH_DEVFN_I2C1:
+		return 1;
+	case PCH_DEVFN_I2C2:
+		return 2;
+	case PCH_DEVFN_I2C3:
+		return 3;
+	case PCH_DEVFN_I2C4:
+		return 4;
+	case PCH_DEVFN_I2C5:
+		return 5;
+	}
+	return -1;
+}
+
+int dw_i2c_soc_bus_to_devfn(unsigned int bus)
+{
+	switch (bus) {
+	case 0:
+		return PCH_DEVFN_I2C0;
+	case 1:
+		return PCH_DEVFN_I2C1;
+	case 2:
+		return PCH_DEVFN_I2C2;
+	case 3:
+		return PCH_DEVFN_I2C3;
+	case 4:
+		return PCH_DEVFN_I2C4;
+	case 5:
+		return PCH_DEVFN_I2C5;
+	}
+	return -1;
+}