1 files changed, 151 insertions, 0 deletions
diff --git a/os/hal/ports/TIVA/LLD/uDMA/tiva_udma.c b/os/hal/ports/TIVA/LLD/uDMA/tiva_udma.c
new file mode 100644
index 0000000..2d18ff5
--- /dev/null
+++ b/os/hal/ports/TIVA/LLD/uDMA/tiva_udma.c
@@ -0,0 +1,151 @@
+/*
+    Copyright (C) 2014..2017 Marco Veeneman
+
+    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    uDMA/tiva_udma.c
+ * @brief   DMA helper driver code.
+ *
+ * @addtogroup TIVA_DMA
+ * @{
+ */
+
+#include "hal.h"
+
+/* The following macro is only defined if some driver requiring DMA services
+   has been enabled.*/
+#if defined(TIVA_UDMA_REQUIRED) || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+udmaControlTable_t udmaControlTable;
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+static uint32_t udma_channel_mask;
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+#if !defined(TIVA_UDMA_SW_HANDLER)
+#error "TIVA_UDMA_SW_HANDLER not defined"
+#endif
+/**
+ * @brief   UDMA software interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(TIVA_UDMA_SW_HANDLER)
+{
+  OSAL_IRQ_PROLOGUE();
+
+  /* TODO Process software transfer interrupts.*/
+
+  OSAL_IRQ_EPILOGUE();
+}
+
+#if !defined(TIVA_UDMA_ERR_HANDLER)
+#error "TIVA_UDMA_ERR_HANDLER not defined"
+#endif
+/**
+ * @brief   UDMA error interrupt handler.
+ *
+ * @isr
+ */
+OSAL_IRQ_HANDLER(TIVA_UDMA_ERR_HANDLER)
+{
+  OSAL_IRQ_PROLOGUE();
+
+  /* TODO Do we need to halt the system on a DMA error?*/
+
+  if (HWREG(UDMA_ERRCLR)) {
+    HWREG(UDMA_ERRCLR) = 1;
+  }
+
+  OSAL_IRQ_EPILOGUE();
+}
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Initialize UDMA.
+ *
+ * @init
+ */
+void udmaInit(void)
+{
+  udma_channel_mask = 0;
+
+  /* Enable UDMA module.*/
+  HWREG(SYSCTL_RCGCDMA) = 1;
+  while (!(HWREG(SYSCTL_PRDMA) & (1 << 0)))
+    ;
+
+  nvicEnableVector(TIVA_UDMA_ERR_NUMBER, TIVA_UDMA_ERR_IRQ_PRIORITY);
+  nvicEnableVector(TIVA_UDMA_SW_NUMBER, TIVA_UDMA_SW_IRQ_PRIORITY);
+
+  /* Enable UDMA controller.*/
+  HWREG(UDMA_CFG) = UDMA_CFG_MASTEN;
+
+  /* Set address of control table.*/
+  HWREG(UDMA_CTLBASE) = (uint32_t)udmaControlTable.primary;
+}
+
+/**
+ * @brief   Allocates a DMA channel.
+ *
+ * @special
+ */
+bool udmaChannelAllocate(uint8_t dmach)
+{
+  /* Checks if the channel is already taken.*/
+  if ((udma_channel_mask & (1 << dmach)) != 0)
+    return TRUE;
+
+  /* Mark channel as used */
+  udma_channel_mask |= (1 << dmach);
+
+  return FALSE;
+}
+
+/**
+ * @brief   Releases a DMA channel.
+ *
+ * @special
+ */
+void udmaChannelRelease(uint8_t dmach)
+{
+  /* Marks the channel as not used.*/
+  udma_channel_mask &= ~(1 << dmach);
+}
+
+#endif
+
+/** @} */