Import Mbed OS hard-float snapshot

targets/TARGET_Maxim/TARGET_MAX32620C/mxc/prng.h

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+/**
+ * @file
+ * @brief      Pseudo-random number generator(PRNG) Peripheral Module.
+ * @note       The PRNG hardware does not produce true random numbers. The
+ *             output should be used as a seed to an approved random-number
+ *             algorithm, per a certifying authority such as NIST or PCI. The
+ *             approved algorithm will output random numbers which are cerfitied
+ *             for use in encryption and authentication algorithms.
+ */
+/* ****************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *
+ * $Date: 2016-10-10 19:26:15 -0500 (Mon, 10 Oct 2016) $
+ * $Revision: 24668 $
+ *
+ ******************************************************************************/
+
+/* **** Includes **** */
+#include "prng_regs.h"
+
+/* Define to prevent redundant inclusion */
+#ifndef _PRNG_H_
+#define _PRNG_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @ingroup    periphlibs
+ * @defgroup   prng Pseudo-Random Number Generator (PRNG)
+ * @brief      Pseudo-random number generator(PRNG) Peripheral Module.
+ * @note       The PRNG hardware does not produce true random numbers. The
+ *             output should be used as a seed to an approved random-number
+ *             algorithm, per a certifying authority such as NIST or PCI. The
+ *             approved algorithm will output random numbers which are cerfitied
+ *             for use in encryption and authentication algorithms.
+ * @{
+ */
+
+/* **** Definitions **** */
+
+/* **** Globals **** */
+
+/* **** Function Prototypes **** */
+
+/**
+ * @brief      Initialize required clocks and enable PRNG module
+ * @note       This function will set the clock divisors to divide by 1 if they are disabled.
+ *             Otherwise, the clock divisors are left unchanged.
+ */
+void PRNG_Init(void);
+
+/**
+ * @brief      Returns ready bit to indicates that the PRNG_GetSeed can be
+ *             called without being held off. Only needs to be called one time after a POR event.
+ *
+ * @retval     0         PRNG not ready
+ * @retval     non-zero  PRNG ready to read
+ */
+__STATIC_INLINE uint16_t PRNG_Ready(void)
+{
+    return (MXC_PRNG->user_entropy & MXC_F_PRNG_USER_ENTROPY_RND_NUM_READY);
+}
+
+/**
+ * @brief      Retrieve a seed value from the PRNG.
+ * @note       The PRNG hardware does not produce true random numbers. The
+ *             output should be used as a seed to an approved random-number
+ *             algorithm, per a certifying authority such as NIST or PCI. The
+ *             approved algorithm will output random numbers which are cerfitied
+ *             for use in encryption and authentication algorithms.
+ *
+ * @return     16-bit seed value
+ */
+__STATIC_INLINE uint16_t PRNG_GetSeed(void)
+{
+    return MXC_PRNG->rnd_num;
+}
+
+/**
+ * @brief      Add user entropy to the PRNG entropy source.
+ *
+ * @param      entropy  A value to be mixed into the PRNG entropy source.
+ */
+__STATIC_INLINE void PRNG_AddUserEntropy(uint8_t entropy)
+{
+    MXC_PRNG->user_entropy = (uint32_t)entropy;
+}
+/**@}*/
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _PRNG_H_ */