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75 lines
2.8 KiB
Diff
75 lines
2.8 KiB
Diff
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From 538098281ce884a51d2aa4ab445056a41741c6ad Mon Sep 17 00:00:00 2001
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From: Christian Lamparter <chunkeey@gmail.com>
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Date: Sat, 17 Nov 2018 17:17:20 +0100
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Subject: [PATCH] dt-bindings: dmaengine: dw-dmac: add protection control
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property
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This patch for the DesignWare AHB Central
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Direct Memory Access Controller adds the dma
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protection control property:
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"snps,dma-protection-control"
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as well as the properties specific values defines into
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a new include file: include/dt-bindings/dma/dw-dmac.h
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Note: The protection control signals are one-to-one
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mapped to the AHB HPROT[1:3] signals for this controller.
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The HPROT0 (Data Access) is always hardwired to 1.
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Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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Reviewed-by: Rob Herring <robh@kernel.org>
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Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
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Signed-off-by: Vinod Koul <vkoul@kernel.org>
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---
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Documentation/devicetree/bindings/dma/snps-dma.txt | 4 ++++
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MAINTAINERS | 4 +++-
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include/dt-bindings/dma/dw-dmac.h | 14 ++++++++++++++
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3 files changed, 21 insertions(+), 1 deletion(-)
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create mode 100644 include/dt-bindings/dma/dw-dmac.h
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--- a/Documentation/devicetree/bindings/dma/snps-dma.txt
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+++ b/Documentation/devicetree/bindings/dma/snps-dma.txt
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@@ -27,6 +27,10 @@ Optional properties:
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general purpose DMA channel allocator. False if not passed.
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- multi-block: Multi block transfers supported by hardware. Array property with
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one cell per channel. 0: not supported, 1 (default): supported.
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+- snps,dma-protection-control: AHB HPROT[3:1] protection setting.
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+ The default value is 0 (for non-cacheable, non-buffered,
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+ unprivileged data access).
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+ Refer to include/dt-bindings/dma/dw-dmac.h for possible values.
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Example:
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--- a/MAINTAINERS
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+++ b/MAINTAINERS
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@@ -14075,9 +14075,11 @@ SYNOPSYS DESIGNWARE DMAC DRIVER
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M: Viresh Kumar <vireshk@kernel.org>
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R: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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S: Maintained
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+F: Documentation/devicetree/bindings/dma/snps-dma.txt
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+F: drivers/dma/dw/
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+F: include/dt-bindings/dma/dw-dmac.h
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F: include/linux/dma/dw.h
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F: include/linux/platform_data/dma-dw.h
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-F: drivers/dma/dw/
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SYNOPSYS DESIGNWARE ENTERPRISE ETHERNET DRIVER
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M: Jose Abreu <Jose.Abreu@synopsys.com>
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--- /dev/null
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+++ b/include/dt-bindings/dma/dw-dmac.h
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@@ -0,0 +1,14 @@
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+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
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+
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+#ifndef __DT_BINDINGS_DMA_DW_DMAC_H__
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+#define __DT_BINDINGS_DMA_DW_DMAC_H__
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+
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+/*
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+ * Protection Control bits provide protection against illegal transactions.
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+ * The protection bits[0:2] are one-to-one mapped to AHB HPROT[3:1] signals.
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+ */
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+#define DW_DMAC_HPROT1_PRIVILEGED_MODE (1 << 0) /* Privileged Mode */
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+#define DW_DMAC_HPROT2_BUFFERABLE (1 << 1) /* DMA is bufferable */
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+#define DW_DMAC_HPROT3_CACHEABLE (1 << 2) /* DMA is cacheable */
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+
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+#endif /* __DT_BINDINGS_DMA_DW_DMAC_H__ */
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