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Commit 53809828 authored by Christian Lamparter's avatar Christian Lamparter Committed by Vinod Koul
Browse files

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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarChristian Lamparter <chunkeey@gmail.com>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 65102238

Documentation/devicetree/bindings/dma/snps-dma.txt

+4 −0
Original line number Diff line number Diff line
@@ -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:

MAINTAINERS

+3 −1
Original line number Diff line number Diff line
@@ -14363,9 +14363,11 @@ 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>

include/dt-bindings/dma/dw-dmac.h

0 → 100644
+14 −0
Original line number Diff line number Diff line 
/* 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__ */