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diff --git a/include/ec/config.h b/include/ec/config.h
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+++ b/include/ec/config.h
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+/* Copyright 2013-2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @file config.H
+ *
+ * @brief Definitions for EC configuration values.
+ *
+ */
+
+#ifndef __EC_CONFIG_H_
+#define __EC_CONFIG_H_
+
+#include <stdint.h>
+
+#define EC_RTC_PORT_BASE    (0x70) // RTC/CMOS LPC base address
+#define EC_RTC_BLOCK_SIZE   (512)  // Size of addressable data in RTC
+#define EC_RTC_CENTURY      (1)    // 1 if century format is enabled
+#if EC_RTC_CENTURY
+#define EC_RTC_BBRAM_OFFSET (0x33) // Offset of NV data (= size of calendar)
+#else
+#define EC_RTC_BBRAM_OFFSET (0x0E) // Offset of NV data (= size of calendar)
+#endif // #if EC_RTC_CENTURY
+
+#define EC_RTCDD_READ_TRIES  (2)      // Times to try the RTC if updating
+#define EC_RTCDD_RETRY_DELAY (300000) // Delay between RTC read retries in ns
+                                      // based on update time of 244 + 30.5 µs
+
+#define EC_GPIO_INDEX        0x200
+#define EC_GPIO_DATA         0x201
+#define EC_GPIO_NUM_PORTS    17
+#define EC_GPIO_PORT_SKIP    4
+
+#define EC_GPIO_DATA_OFFSET  0x0
+#define EC_GPIO_DDR_OFFSET   0x1
+#define EC_GPIO_PIN_OFFSET   0x2
+#define EC_GPIO_PUP_OFFSET   0x3
+
+typedef enum EcGpioPort {
+    EC_GPIO_PORT_A = 0,
+    EC_GPIO_PORT_B = 1,
+    EC_GPIO_PORT_C = 2,
+    EC_GPIO_PORT_D = 3,
+    EC_GPIO_PORT_E = 4,
+    EC_GPIO_PORT_F = 5,
+    EC_GPIO_PORT_G = 6,
+    EC_GPIO_PORT_H = 7,
+    // skip port I
+    EC_GPIO_PORT_J = 8,
+    EC_GPIO_PORT_K = 9,
+    EC_GPIO_PORT_L = 10,
+    EC_GPIO_PORT_M = 11,
+    EC_GPIO_PORT_N = 12,
+    // skip port O
+    EC_GPIO_PORT_P = 13,
+    EC_GPIO_PORT_Q = 14,
+    EC_GPIO_PORT_R = 15,
+    EC_GPIO_PORT_S = 16,
+} EcGpioPort;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void ec_outb(uint16_t, uint8_t);
+uint8_t ec_inb(uint16_t);
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // __EC_CONFIG_H_