target/linux/apm821xx/patches-4.19/010-dt-bindings-dmaengine-dw-dmac-add-protection-control.patch

   1 From 538098281ce884a51d2aa4ab445056a41741c6ad Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Sat, 17 Nov 2018 17:17:20 +0100
   4 Subject: [PATCH] dt-bindings: dmaengine: dw-dmac: add protection control
   5  property
   6
   7 This patch for the DesignWare AHB Central
   8 Direct Memory Access Controller adds the dma
   9 protection control property:
  10         "snps,dma-protection-control"
  11
  12 as well as the properties specific values defines into
  13 a new include file: include/dt-bindings/dma/dw-dmac.h
  14
  15 Note: The protection control signals are one-to-one
  16 mapped to the AHB HPROT[1:3] signals for this controller.
  17 The HPROT0 (Data Access) is always hardwired to 1.
  18
  19 Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
  20 Reviewed-by: Rob Herring <robh@kernel.org>
  21 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
  22 Signed-off-by: Vinod Koul <vkoul@kernel.org>
  23 ---
  24  Documentation/devicetree/bindings/dma/snps-dma.txt |  4 ++++
  25  MAINTAINERS                                        |  4 +++-
  26  include/dt-bindings/dma/dw-dmac.h                  | 14 ++++++++++++++
  27  3 files changed, 21 insertions(+), 1 deletion(-)
  28  create mode 100644 include/dt-bindings/dma/dw-dmac.h
  29
  30 --- a/Documentation/devicetree/bindings/dma/snps-dma.txt
  31 +++ b/Documentation/devicetree/bindings/dma/snps-dma.txt
  32 @@ -27,6 +27,10 @@ Optional properties:
  33    general purpose DMA channel allocator. False if not passed.
  34  - multi-block: Multi block transfers supported by hardware. Array property with
  35    one cell per channel. 0: not supported, 1 (default): supported.
  36 +- snps,dma-protection-control: AHB HPROT[3:1] protection setting.
  37 +  The default value is 0 (for non-cacheable, non-buffered,
  38 +  unprivileged data access).
  39 +  Refer to include/dt-bindings/dma/dw-dmac.h for possible values.
  40
  41  Example:
  42
  43 --- a/MAINTAINERS
  44 +++ b/MAINTAINERS
  45 @@ -14075,9 +14075,11 @@ SYNOPSYS DESIGNWARE DMAC DRIVER
  46  M:     Viresh Kumar <vireshk@kernel.org>
  47  R:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
  48  S:     Maintained
  49 +F:     Documentation/devicetree/bindings/dma/snps-dma.txt
  50 +F:     drivers/dma/dw/
  51 +F:     include/dt-bindings/dma/dw-dmac.h
  52  F:     include/linux/dma/dw.h
  53  F:     include/linux/platform_data/dma-dw.h
  54 -F:     drivers/dma/dw/
  55
  56  SYNOPSYS DESIGNWARE ENTERPRISE ETHERNET DRIVER
  57  M:     Jose Abreu <Jose.Abreu@synopsys.com>
  58 --- /dev/null
  59 +++ b/include/dt-bindings/dma/dw-dmac.h
  60 @@ -0,0 +1,14 @@
  61 +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
  62 +
  63 +#ifndef __DT_BINDINGS_DMA_DW_DMAC_H__
  64 +#define __DT_BINDINGS_DMA_DW_DMAC_H__
  65 +
  66 +/*
  67 + * Protection Control bits provide protection against illegal transactions.
  68 + * The protection bits[0:2] are one-to-one mapped to AHB HPROT[3:1] signals.
  69 + */
  70 +#define DW_DMAC_HPROT1_PRIVILEGED_MODE (1 << 0)        /* Privileged Mode */
  71 +#define DW_DMAC_HPROT2_BUFFERABLE      (1 << 1)        /* DMA is bufferable */
  72 +#define DW_DMAC_HPROT3_CACHEABLE       (1 << 2)        /* DMA is cacheable */
  73 +
  74 +#endif /* __DT_BINDINGS_DMA_DW_DMAC_H__ */