mirror of
https://gitlab.rtems.org/rtems/rtos/rtems.git
synced 2026-09-21 13:08:36 +08:00
Alex White
63b21ad5e0
This allows drivers to read configuration data from the device tree if the BSP is built with device tree support.
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2022 On-Line Applications Research Corporation (OAR)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <bspopts.h>
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#include <bsp/microblaze-fdt-support.h>
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#ifdef BSP_MICROBLAZE_FPGA_USE_FDT
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#include <bsp/fdt.h>
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#include <libfdt.h>
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#include BSP_MICROBLAZE_FPGA_DTB_HEADER_PATH
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const void *bsp_fdt_get(void)
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{
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return system_dtb;
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}
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uint32_t bsp_fdt_map_intr(const uint32_t *intr, size_t icells)
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{
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return intr[0];
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}
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#endif /* BSP_MICROBLAZE_FPGA_USE_FDT */
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uint32_t try_get_prop_from_device_tree(
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const char *compatible,
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const char *prop_name,
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uint32_t default_value
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)
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{
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uint32_t value = default_value;
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#ifdef BSP_MICROBLAZE_FPGA_USE_FDT
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const void *fdt = bsp_fdt_get();
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int node = fdt_node_offset_by_compatible( fdt, -1, compatible );
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if ( node < 0 ) {
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return default_value;
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}
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const uint32_t *prop = fdt_getprop( fdt, node, prop_name, NULL );
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if ( prop == NULL ) {
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return default_value;
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}
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value = fdt32_to_cpu( prop[0] );
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#endif /* BSP_MICROBLAZE_FPGA_USE_FDT */
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return value;
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}
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