From bc183b1da77d6e2fbc801327a1811d446d34f54f Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Wed, 31 Oct 2018 22:20:46 +0100 Subject: [PATCH 1/2] dt-bindings: add protection control property This patch adds the protection control property and dt-binding definitions for the DesignWare AHB Central Direct Memory Access Controller. Signed-off-by: Christian Lamparter --- include/dt-bindings/dma/dw-dmac.h | 20 +++++++++++++++++++ 1 files changed, 20 insertions(+), 0 deletion(-) create mode 100644 include/dt-bindings/dma/dw-dmac.h --- /dev/null +++ b/include/dt-bindings/dma/dw-dmac.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */ + +#ifndef __DT_BINDINGS_DMA_DW_DMAC_H__ +#define __DT_BINDINGS_DMA_DW_DMAC_H__ + +#define DW_DMAC_CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */ +#define DW_DMAC_CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */ +#define DW_DMAC_CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */ +#define DW_DMAC_CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */ + +/* + * Protection Control bits provide protection against illegal transactions. + * The protection bits[0:2] are one-to-one mapped to AHB HPROT[3:1] signals. + * The AHB HPROT[0] bit is hardwired to 1: Data Access. + */ +#define DW_DMAC_HPROT1_PRIVILEGED_MODE (1 << 0) /* Privileged Mode */ +#define DW_DMAC_HPROT2_BUFFERABLE (1 << 1) /* DMA is bufferable */ +#define DW_DMAC_HPROT3_CACHEABLE (1 << 2) /* DMA is cacheable */ + +#endif /* __DT_BINDINGS_DMA_DW_DMAC_H__ */