No more (static inline) function bodies in headers

1 files changed, 18 insertions, 0 deletions

diff --git a/libhw_cr/rp2040_dma.c b/libhw_cr/rp2040_dma.c
index e117c19..8901f06 100644
--- a/libhw_cr/rp2040_dma.c
+++ b/libhw_cr/rp2040_dma.c
@@ -1,5 +1,8 @@
 /* libhw_cr/rp2040_dma.c - Utilities for sharing the DMA IRQs
  *
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (C) 2025  Luke T. Shumaker <lukeshu@lukeshu.com>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
@@ -8,6 +11,21 @@
 
 #include "rp2040_dma.h"
 
+/* Borrowed from <hardware/dma.h> *********************************************/
+
+dma_channel_hw_t *dma_channel_hw_addr(uint channel) {
+	assert(channel < NUM_DMA_CHANNELS);
+	return &dma_hw->ch[channel];
+}
+
+enum dma_channel_transfer_size {
+	DMA_SIZE_8  = 0, ///< Byte transfer (8 bits)
+	DMA_SIZE_16 = 1, ///< Half word transfer (16 bits)
+	DMA_SIZE_32 = 2  ///< Word transfer (32 bits)
+};
+
+/* Our own code ***************************************************************/
+
 struct dmairq_handler_entry {
 	dmairq_handler_t         fn;
 	void                    *arg;