From d7cc12cbad0e196e5352d81cd839d077c549768c Mon Sep 17 00:00:00 2001
From: Theodore Ateba <tf.ateba@gmail.com>
Date: Thu, 22 Dec 2022 22:13:49 +0000
Subject: [PATCH] [AVR] Add ATxmega CRC register definition for lld driver.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@15903 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
---
 os/hal/ports/AVR/XMEGA/LLD/CRCv1/driver.mk   |  11 ++
 os/hal/ports/AVR/XMEGA/LLD/CRCv1/xmega_crc.h | 131 +++++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 os/hal/ports/AVR/XMEGA/LLD/CRCv1/driver.mk
 create mode 100644 os/hal/ports/AVR/XMEGA/LLD/CRCv1/xmega_crc.h

diff --git a/os/hal/ports/AVR/XMEGA/LLD/CRCv1/driver.mk b/os/hal/ports/AVR/XMEGA/LLD/CRCv1/driver.mk
new file mode 100644
index 000000000..9d1ba079c
--- /dev/null
+++ b/os/hal/ports/AVR/XMEGA/LLD/CRCv1/driver.mk
@@ -0,0 +1,11 @@
+ifeq ($(USE_SMART_BUILD),yes)
+ifneq ($(findstring HAL_USE_CRC TRUE,$(HALCONF)),)
+PLATFORMSRC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/CRCv1/hal_crc_lld.c
+PLATFORMSRC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/CRCv1/hal_crc.c
+endif
+else
+PLATFORMSRC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/CRCv1/hal_crc_lld.c
+PLATFORMSRC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/CRCv1/hal_crc.c
+endif
+
+PLATFORMINC += $(CHIBIOS)/os/hal/ports/AVR/XMEGA/LLD/CRCv1
diff --git a/os/hal/ports/AVR/XMEGA/LLD/CRCv1/xmega_crc.h b/os/hal/ports/AVR/XMEGA/LLD/CRCv1/xmega_crc.h
new file mode 100644
index 000000000..29d480974
--- /dev/null
+++ b/os/hal/ports/AVR/XMEGA/LLD/CRCv1/xmega_crc.h
@@ -0,0 +1,131 @@
+/*
+    ChibiOS - Copyright (C) 2006..2022 Theodore Ateba
+
+    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    CRCv1/xmega_crc.h
+ * @brief   XMEGA CRC units common header.
+ * @note    This file requires definitions from the ATMEL XMEGA header file.
+ *
+ * @addtogroup XMEGA_CRCv1
+ * @{
+ */
+
+#ifndef XMEGA_CRC_H
+#define XMEGA_CRC_H
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   CRC module base address.
+ */
+#define CRC_BASE        0x00D0
+
+/**
+ * @note    Discarded definition from Atmel ATxmega headers.
+ *          The CRC driver uses its own definition in order to have an
+ *          unified handling for all devices.
+ */
+#undef CRC
+
+/**
+ * @name    CRC Cyclic redondancy check definitions.
+ * @{
+ */
+#define CRC             ((xmega_crc_t *)CRC_BASE)
+/** @} */
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief  XMEGA CRC registers block.
+ */
+typedef struct {
+
+  volatile union {
+    uint8_t reg;
+    struct {
+      uint8_t SOURCE    : 4;
+      uint8_t           : 1;
+      uint8_t CRC32     : 1;
+      uint8_t RESET     : 2;
+    } bit;
+  }  CTRL;
+  volatile union {
+    uint8_t reg;
+    struct {
+      uint8_t BUSY      : 1;
+      uint8_t ZERO      : 1;
+      uint8_t           : 6;
+    } bit;
+  }  STATUS;
+  uint8_t reserved1;
+  volatile union {
+    uint8_t reg;
+    struct {
+      uint8_t DATAIN    : 8;
+    } bit;
+  }  DATAIN;
+  volatile union {
+    uint8_t reg;
+    struct {
+      uint8_t CHECKSUM  : 8;
+    } bit;
+  }  CHECKSUM0;
+  volatile union {
+    uint8_t reg;
+    struct {
+      uint8_t CHECKSUM  : 8;
+    } bit;
+  }  CHECKSUM1;
+  volatile union {
+    uint8_t reg;
+    struct {
+      uint8_t CHECKSUM  : 8;
+    } bit;
+  }  CHECKSUM2;
+  volatile union {
+    uint8_t reg;
+    struct {
+      uint8_t CHECKSUM  : 8;
+    } bit;
+  }  CHECKSUM3;
+} xmega_crc_t;
+
+/** @} */
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#endif /* XMEGA_CRC_H */
+
+/** @} */