Resguardo inicial

2026-09-06 12:53:21 -06:00
parent 662efe3c2a
commit ad2088d178
94853 changed files with 43200404 additions and 0 deletions
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _MXS_DMA_H_
+#define _MXS_DMA_H_
+
+#include <linux/dmaengine.h>
+
+#define MXS_DMA_CTRL_WAIT4END	BIT(31)
+#define MXS_DMA_CTRL_WAIT4RDY	BIT(30)
+
+/*
+ * The mxs dmaengine can do PIO transfers. We pass a pointer to the PIO words
+ * in the second argument to dmaengine_prep_slave_sg when the direction is
+ * set to DMA_TRANS_NONE. To make this clear and to prevent users from doing
+ * the error prone casting we have this wrapper function
+ */
+static inline struct dma_async_tx_descriptor *mxs_dmaengine_prep_pio(
+        struct dma_chan *chan, u32 *pio, unsigned int npio,
+        enum dma_transfer_direction dir, unsigned long flags)
+{
+	return dmaengine_prep_slave_sg(chan, (struct scatterlist *)pio, npio,
+				       dir, flags);
+}
+
+#endif /* _MXS_DMA_H_ */