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From 538098281ce884a51d2aa4ab445056a41741c6ad Mon Sep 17 00:00:00 2001
From: Christian Lamparter <chunkeey@gmail.com>
Date: Sat, 17 Nov 2018 17:17:20 +0100
Subject: [PATCH] dt-bindings: dmaengine: dw-dmac: add protection control
property
This patch for the DesignWare AHB Central
Direct Memory Access Controller adds the dma
protection control property:
"snps,dma-protection-control"
as well as the properties specific values defines into
a new include file: include/dt-bindings/dma/dw-dmac.h
Note: The protection control signals are one-to-one
mapped to the AHB HPROT[1:3] signals for this controller.
The HPROT0 (Data Access) is always hardwired to 1.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
Documentation/devicetree/bindings/dma/snps-dma.txt | 4 ++++
MAINTAINERS | 4 +++-
include/dt-bindings/dma/dw-dmac.h | 14 ++++++++++++++
3 files changed, 21 insertions(+), 1 deletion(-)
create mode 100644 include/dt-bindings/dma/dw-dmac.h
--- a/Documentation/devicetree/bindings/dma/snps-dma.txt
+++ b/Documentation/devicetree/bindings/dma/snps-dma.txt
@@ -27,6 +27,10 @@ Optional properties:
general purpose DMA channel allocator. False if not passed.
- multi-block: Multi block transfers supported by hardware. Array property with
one cell per channel. 0: not supported, 1 (default): supported.
+- snps,dma-protection-control: AHB HPROT[3:1] protection setting.
+ The default value is 0 (for non-cacheable, non-buffered,
+ unprivileged data access).
+ Refer to include/dt-bindings/dma/dw-dmac.h for possible values.
Example:
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14075,9 +14075,11 @@ SYNOPSYS DESIGNWARE DMAC DRIVER
M: Viresh Kumar <vireshk@kernel.org>
R: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
S: Maintained
+F: Documentation/devicetree/bindings/dma/snps-dma.txt
+F: drivers/dma/dw/
+F: include/dt-bindings/dma/dw-dmac.h
F: include/linux/dma/dw.h
F: include/linux/platform_data/dma-dw.h
-F: drivers/dma/dw/
SYNOPSYS DESIGNWARE ENTERPRISE ETHERNET DRIVER
M: Jose Abreu <Jose.Abreu@synopsys.com>
--- /dev/null
+++ b/include/dt-bindings/dma/dw-dmac.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+
+#ifndef __DT_BINDINGS_DMA_DW_DMAC_H__
+#define __DT_BINDINGS_DMA_DW_DMAC_H__
+
+/*
+ * Protection Control bits provide protection against illegal transactions.
+ * The protection bits[0:2] are one-to-one mapped to AHB HPROT[3:1] signals.
+ */
+#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__ */
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