272 lines
7.8 KiB
C
272 lines
7.8 KiB
C
/**
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* @file
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* @brief DMA Devicetree macro public API header file.
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*/
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/*
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* Copyright (c) 2020, Linaro Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_DEVICETREE_DMAS_H_
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#define ZEPHYR_INCLUDE_DEVICETREE_DMAS_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @defgroup devicetree-dmas Devicetree DMA API
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* @ingroup devicetree
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* @{
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*/
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/**
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* @brief Get a label property from the node referenced by a dmas
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* property at an index
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*
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* It's an error if the DMA controller node referenced by the phandle
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* in node_id's dmas property at index "idx" has no label property.
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*
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* Example devicetree fragment:
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*
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* dma1: dma@... {
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* label = "DMA_1";
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* };
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*
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* dma2: dma@... {
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* label = "DMA_2";
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* };
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*
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* n: node {
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* dmas = <&dma1 1 2 0x400 0x3>,
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* <&dma2 6 3 0x404 0x5>;
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* };
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*
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* Example usage:
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*
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* DT_DMAS_LABEL_BY_IDX(DT_NODELABEL(n), 1) // "DMA_2"
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*
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* @param node_id node identifier for a node with a dmas property
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* @param idx logical index into dmas property
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* @return the label property of the node referenced at index "idx"
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*/
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#define DT_DMAS_LABEL_BY_IDX(node_id, idx) \
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DT_PROP_BY_PHANDLE_IDX(node_id, dmas, idx, label)
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/**
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* @brief Get a label property from a DT_DRV_COMPAT instance's dmas
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* property at an index
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* @param inst DT_DRV_COMPAT instance number
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* @param idx logical index into dmas property
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* @return the label property of the node referenced at index "idx"
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* @see DT_DMAS_LABEL_BY_IDX()
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*/
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#define DT_INST_DMAS_LABEL_BY_IDX(inst, idx) \
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DT_DMAS_LABEL_BY_IDX(DT_DRV_INST(inst), idx)
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/**
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* @brief Get a label property from a dmas property by name
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*
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* It's an error if the DMA controller node referenced by the phandle
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* in node_id's dmas property at the element named "name" has no label
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* property.
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*
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* Example devicetree fragment:
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*
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* dma1: dma@... {
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* label = "DMA_1";
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* };
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*
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* dma2: dma@... {
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* label = "DMA_2";
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* };
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*
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* n: node {
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* dmas = <&dma1 1 2 0x400 0x3>,
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* <&dma2 6 3 0x404 0x5>;
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* dma-names = "tx", "rx";
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* };
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*
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* Example usage:
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*
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* DT_DMAS_LABEL_BY_NAME(DT_NODELABEL(n), rx) // "DMA_2"
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*
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* @param node_id node identifier for a node with a dmas property
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* @param name lowercase-and-underscores name of a dmas element
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* as defined by the node's dma-names property
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* @return the label property of the node referenced at the named element
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*/
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#define DT_DMAS_LABEL_BY_NAME(node_id, name) \
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DT_PROP(DT_PHANDLE_BY_NAME(node_id, dmas, name), label)
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/**
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* @brief Get a label property from a DT_DRV_COMPAT instance's dmas
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* property by name
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* @param inst DT_DRV_COMPAT instance number
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* @param name lowercase-and-underscores name of a dmas element
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* as defined by the node's dma-names property
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* @return the label property of the node referenced at the named element
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* @see DT_DMAS_LABEL_BY_NAME()
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*/
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#define DT_INST_DMAS_LABEL_BY_NAME(inst, name) \
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DT_DMAS_LABEL_BY_NAME(DT_DRV_INST(inst), name)
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/**
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* @brief Get a DMA specifier's cell value at an index
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*
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* Example devicetree fragment:
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*
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* dma1: dma@... {
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* compatible = "vnd,dma";
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* #dma-cells = <2>;
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* };
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*
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* dma2: dma@... {
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* compatible = "vnd,dma";
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* #dma-cells = <2>;
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* };
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*
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* n: node {
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* dmas = <&dma1 1 0x400>,
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* <&dma2 6 0x404>;
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* };
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*
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* Bindings fragment for the vnd,dma compatible:
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*
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* dma-cells:
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* - channel
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* - config
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*
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* Example usage:
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*
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* DT_DMAS_CELL_BY_IDX(DT_NODELABEL(n), 0, channel) // 1
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* DT_DMAS_CELL_BY_IDX(DT_NODELABEL(n), 1, channel) // 6
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* DT_DMAS_CELL_BY_IDX(DT_NODELABEL(n), 0, config) // 0x400
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* DT_DMAS_CELL_BY_IDX(DT_NODELABEL(n), 1, config) // 0x404
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*
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* @param node_id node identifier for a node with a dmas property
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* @param idx logical index into dmas property
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* @param cell lowercase-and-underscores cell name
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* @return the cell value at index "idx"
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* @see DT_PHA_BY_IDX()
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*/
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#define DT_DMAS_CELL_BY_IDX(node_id, idx, cell) \
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DT_PHA_BY_IDX(node_id, dmas, idx, cell)
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/**
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* @brief Get a DT_DRV_COMPAT instance's DMA specifier's cell value at an index
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* @param inst DT_DRV_COMPAT instance number
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* @param idx logical index into dmas property
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* @param cell lowercase-and-underscores cell name
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* @return the cell value at index "idx"
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* @see DT_DMAS_CELL_BY_IDX()
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*/
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#define DT_INST_DMAS_CELL_BY_IDX(inst, idx, cell) \
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DT_PHA_BY_IDX(DT_DRV_INST(inst), dmas, idx, cell)
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/**
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* @brief Get a DMA specifier's cell value by name
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*
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* Example devicetree fragment:
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*
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* dma1: dma@... {
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* compatible = "vnd,dma";
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* #dma-cells = <2>;
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* };
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*
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* dma2: dma@... {
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* compatible = "vnd,dma";
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* #dma-cells = <2>;
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* };
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*
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* n: node {
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* dmas = <&dma1 1 0x400>,
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* <&dma2 6 0x404>;
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* dma-names = "tx", "rx";
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* };
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*
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* Bindings fragment for the vnd,dma compatible:
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*
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* dma-cells:
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* - channel
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* - config
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*
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* Example usage:
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*
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* DT_DMAS_CELL_BY_NAME(DT_NODELABEL(n), tx, channel) // 1
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* DT_DMAS_CELL_BY_NAME(DT_NODELABEL(n), rx, channel) // 6
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* DT_DMAS_CELL_BY_NAME(DT_NODELABEL(n), tx, config) // 0x400
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* DT_DMAS_CELL_BY_NAME(DT_NODELABEL(n), rx, config) // 0x404
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*
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* @param node_id node identifier for a node with a dmas property
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* @param name lowercase-and-underscores name of a dmas element
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* as defined by the node's dma-names property
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* @param cell lowercase-and-underscores cell name
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* @return the cell value in the specifier at the named element
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* @see DT_PHA_BY_NAME()
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*/
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#define DT_DMAS_CELL_BY_NAME(node_id, name, cell) \
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DT_PHA_BY_NAME(node_id, dmas, name, cell)
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/**
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* @brief Get a DT_DRV_COMPAT instance's DMA specifier's cell value by name
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* @param inst DT_DRV_COMPAT instance number
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* @param name lowercase-and-underscores name of a dmas element
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* as defined by the node's dma-names property
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* @param cell lowercase-and-underscores cell name
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* @return the cell value in the specifier at the named element
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* @see DT_DMAS_CELL_BY_NAME()
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*/
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#define DT_INST_DMAS_CELL_BY_NAME(inst, name, cell) \
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DT_DMAS_CELL_BY_NAME(DT_DRV_INST(inst), name, cell)
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/**
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* @brief Is index "idx" valid for a dmas property?
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* @param node_id node identifier for a node with a dmas property
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* @param idx logical index into dmas property
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* @return 1 if the "dmas" property has index "idx", 0 otherwise
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*/
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#define DT_DMAS_HAS_IDX(node_id, idx) \
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IS_ENABLED(DT_CAT(node_id, _P_dmas_IDX_##idx##_EXISTS))
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/**
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* @brief Is index "idx" valid for a DT_DRV_COMPAT instance's dmas property?
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* @param inst DT_DRV_COMPAT instance number
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* @param idx logical index into dmas property
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* @return 1 if the "dmas" property has a specifier at index "idx", 0 otherwise
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*/
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#define DT_INST_DMAS_HAS_IDX(inst, idx) \
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DT_DMAS_HAS_IDX(DT_DRV_INST(inst), idx)
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/**
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* @brief Does a dmas property have a named element?
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* @param node_id node identifier for a node with a dmas property
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* @param name lowercase-and-underscores name of a dmas element
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* as defined by the node's dma-names property
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* @return 1 if the dmas property has the named element, 0 otherwise
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*/
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#define DT_DMAS_HAS_NAME(node_id, name) \
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IS_ENABLED(DT_CAT(node_id, _P_dmas_NAME_##name##_EXISTS))
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/**
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* @brief Does a DT_DRV_COMPAT instance's dmas property have a named element?
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* @param inst DT_DRV_COMPAT instance number
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* @param name lowercase-and-underscores name of a dmas element
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* as defined by the node's dma-names property
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* @return 1 if the dmas property has the named element, 0 otherwise
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*/
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#define DT_INST_DMAS_HAS_NAME(inst, name) \
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DT_DMAS_HAS_NAME(DT_DRV_INST(inst), name)
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZEPHYR_INCLUDE_DEVICETREE_DMAS_H_ */
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