1 files changed, 82 insertions, 0 deletions
diff --git a/libmaple/dma.c b/libmaple/dma.c
new file mode 100644
index 0000000..d13de10
--- /dev/null
+++ b/libmaple/dma.c
@@ -0,0 +1,82 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Michael Hope.
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * 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 THE AUTHORS OR COPYRIGHT HOLDERS
+ * 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.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/dma.c
+ * @author Marti Bolivar <mbolivar@leaflabs.com>;
+ *         Original implementation by Michael Hope
+ * @brief Portable DMA routines.
+ */
+
+#include <libmaple/dma.h>
+#include "dma_private.h"
+#include "stm32_private.h"
+
+/*
+ * Convenience routines
+ */
+
+/**
+ * @brief Initialize a DMA device.
+ * @param dev Device to initialize.
+ */
+void dma_init(dma_dev *dev) {
+    rcc_clk_enable(dev->clk_id);
+}
+
+/*
+ * Private API
+ */
+
+enum dma_atype _dma_addr_type(__io void *addr) {
+    switch (stm32_block_purpose((void*)addr)) {
+    /* Notice we're treating the code block as memory here.  That's
+     * correct for addresses in Flash and in [0x0, 0x7FFFFFF]
+     * (provided that those addresses are aliased to Flash, SRAM, or
+     * FSMC, depending on BOOT[01] and possibly SYSCFG_MEMRMP). It's
+     * not correct for other addresses in the code block, but those
+     * will (hopefully) just fail-fast with transfer or bus errors. If
+     * lots of people get confused, it might be worth being more
+     * careful here. */
+    case STM32_BLOCK_CODE:      /* Fall through */
+    case STM32_BLOCK_SRAM:      /* ... */
+    case STM32_BLOCK_FSMC_1_2:  /* ... */
+    case STM32_BLOCK_FSMC_3_4:
+        return DMA_ATYPE_MEM;
+    case STM32_BLOCK_PERIPH:
+        return DMA_ATYPE_PER;
+    case STM32_BLOCK_FSMC_REG:        /* Fall through */
+        /* Is this right? I can't think of a reason to DMA into or out
+         * of the FSMC registers. [mbolivar]  */
+    case STM32_BLOCK_UNUSED:          /* ... */
+    case STM32_BLOCK_CORTEX_INTERNAL: /* ... */
+        return DMA_ATYPE_OTHER;
+    default:
+        ASSERT(0);              /* Can't happen */
+        return DMA_ATYPE_OTHER;
+    }
+}