Add pmic_i2c_addr_get function for platform code use

Change-Id: I79b5bcc1ce8de9066aa87e793d38fab64752f17f
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/83033
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Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Reviewed-by: Christian R Geddes <crgeddes@us.ibm.com>
Reviewed-by: Jennifer A Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/83735
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
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src/import/chips/ocmb/common/spd_access/pmic_i2c_addr_get.H

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+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/import/chips/ocmb/common/spd_access/pmic_i2c_addr_get.H $ */
+/*                                                                        */
+/* OpenPOWER HostBoot Project                                             */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2019                             */
+/* [+] International Business Machines 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.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+///
+/// @file pmic_i2c_addr_get.H
+/// @brief Function to get PMIC i2c addresses given SPD binary
+///
+// *HWP HWP Owner: Mark Pizzutillo <mark.pizzutillo@ibm.com>
+// *HWP HWP Owner: Dan Crowell <dcrowell@us.ibm.com>
+// *HWP Team: Memory
+// *HWP Level: 2
+// *HWP Consumed by: FSP:HB
+
+///
+/// @brief Get the pmic i2c addrs from the provided spd binary
+///
+/// @param[in] i_spd SPD binary
+/// @param[out] o_pmic0_i2c_addr I2C Address from SPD
+/// @param[out] o_pmic1_i2c_addr I2C Address from SPD
+///
+
+#ifndef __PMIC_I2C_ADDR_GET__
+#define __PMIC_I2C_ADDR_GET__
+
+#include <vector>
+
+constexpr uint16_t SPD_PMIC0_I2C_BYTE = 260;
+constexpr uint16_t SPD_PMIC1_I2C_BYTE = 261;
+
+constexpr uint8_t PMIC0 = 0;
+constexpr uint8_t PMIC1 = 1;
+
+// Mapping from PMIC ID to SPD byte
+static const std::vector<uint16_t> PMIC_I2C_ADDR_VECTOR =
+{
+    SPD_PMIC0_I2C_BYTE, // [0 == PMIC0]
+    SPD_PMIC1_I2C_BYTE  // [1 == PMIC1]
+};
+
+///
+/// @brief Get the pmic i2c address for the given PMIC ID
+///
+/// @param[in] i_spd SPD binary
+/// @param[in] i_pmic_id PMIC ID (0,1)
+/// @return uint8_t I2C address for the given PMIC ID
+/// @note May need to be changed to support 4U SPD
+///
+inline uint8_t get_pmic_i2c_addr(const char* i_spd, const uint8_t i_pmic_id)
+{
+    // Out of range, just return 0. Failsafe so we don't segfault
+    // The caller is responsible for calling this with a valid ID
+    if (i_pmic_id >= PMIC_I2C_ADDR_VECTOR.size())
+    {
+        return 0;
+    }
+
+    const uint16_t l_byte = PMIC_I2C_ADDR_VECTOR[i_pmic_id];
+    return uint8_t(i_spd[l_byte]);
+}
+
+#endif