From 98aeb732ffd81f00bde3fb7dd2a4ff65690ebe7f Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Sun, 9 Sep 2018 09:41:52 +0000
Subject: New TRNG driver model added to HAL.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@12253 110e8d01-0319-4d1e-a829-52ad28d1bb01
---
 os/hal/src/hal.c      |   3 +
 os/hal/src/hal_trng.c | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 os/hal/src/hal_trng.c

(limited to 'os/hal/src')

diff --git a/os/hal/src/hal.c b/os/hal/src/hal.c
index 42b926619..87788ff6a 100644
--- a/os/hal/src/hal.c
+++ b/os/hal/src/hal.c
@@ -113,6 +113,9 @@ void halInit(void) {
 #if (HAL_USE_SPI == TRUE) || defined(__DOXYGEN__)
   spiInit();
 #endif
+#if (HAL_USE_TRNG == TRUE) || defined(__DOXYGEN__)
+  trngInit();
+#endif
 #if (HAL_USE_UART == TRUE) || defined(__DOXYGEN__)
   uartInit();
 #endif
diff --git a/os/hal/src/hal_trng.c b/os/hal/src/hal_trng.c
new file mode 100644
index 000000000..76bba3ca4
--- /dev/null
+++ b/os/hal/src/hal_trng.c
@@ -0,0 +1,151 @@
+/*
+    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
+
+    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    hal_trng.c
+ * @brief   TRNG Driver code.
+ *
+ * @addtogroup TRNG
+ * @{
+ */
+
+#include "hal.h"
+
+#if (HAL_USE_TRNG == TRUE) || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   TRNG Driver initialization.
+ * @note    This function is implicitly invoked by @p halInit(), there is
+ *          no need to explicitly initialize the driver.
+ *
+ * @init
+ */
+void trngInit(void) {
+
+  trng_lld_init();
+}
+
+/**
+ * @brief   Initializes the standard part of a @p TRNGDriver structure.
+ *
+ * @param[out] trngp     pointer to the @p TRNGDriver object
+ *
+ * @init
+ */
+void trngObjectInit(TRNGDriver *trngp) {
+
+  trngp->state  = TRNG_STOP;
+  trngp->config = NULL;
+}
+
+/**
+ * @brief   Configures and activates the TRNG peripheral.
+ *
+ * @param[in] trngp     pointer to the @p TRNGDriver object
+ * @param[in] config    pointer to the @p TRNGConfig object or @p NULL for
+ *                      default configuration
+ *
+ * @api
+ */
+void trngStart(TRNGDriver *trngp, const TRNGConfig *config) {
+
+  osalDbgCheck(trngp != NULL);
+
+  osalSysLock();
+  osalDbgAssert((trngp->state == TRNG_STOP) || (trngp->state == TRNG_READY),
+              "invalid state");
+  trngp->config = config;
+  trng_lld_start(trngp);
+  trngp->state = TRNG_READY;
+  osalSysUnlock();
+}
+
+/**
+ * @brief   Deactivates the TRNG peripheral.
+ *
+ * @param[in] trngp      pointer to the @p TRNGDriver object
+ *
+ * @api
+ */
+void trngStop(TRNGDriver *trngp) {
+
+  osalDbgCheck(trngp != NULL);
+
+  osalSysLock();
+
+  osalDbgAssert((trngp->state == TRNG_STOP) || (trngp->state == TRNG_READY),
+                "invalid state");
+
+  trng_lld_stop(trngp);
+  trngp->config = NULL;
+  trngp->state  = TRNG_STOP;
+
+  osalSysUnlock();
+}
+
+/**
+ * @brief   True random numbers generator.
+ * @note    The function is blocking and likely performs polled waiting
+ *          inside the low level implementation.
+ *
+ * @param[in] trngp             pointer to the @p TRNGDriver object
+ * @param[in] size              size of output buffer
+ * @param[out] out              output buffer
+ * @return                      The operation status.
+ * @retval false                if a random number has been generated.
+ * @retval true                 if an HW error occurred.
+ *
+ * @api
+ */
+bool trngGenerate(TRNGDriver *trngp, size_t size, uint8_t *out) {
+  bool err;
+
+  osalDbgCheck((trngp != NULL) && (out != NULL));
+
+  osalDbgAssert(trngp->state == TRNG_READY, "not ready");
+
+  trngp->state = TRNG_RUNNING;
+
+  err = trng_lld_generate(trngp, size, out);
+
+  trngp->state = TRNG_READY;
+
+  return err;
+}
+
+#endif /* HAL_USE_TRNG == TRUE */
+
+/** @} */
-- 
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