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// SPDX-License-Identifier: BSD-2-Clause
/*
* fdt_fixup.h - Flat Device Tree manipulation helper routines
* Implement platform specific DT fixups on top of libfdt.
*
* Copyright (C) 2020 Bin Meng <bmeng.cn@gmail.com>
*/
#ifndef __FDT_FIXUP_H__
#define __FDT_FIXUP_H__
/**
* Fix up the CPU node in the device tree
*
* This routine updates the "status" property of a CPU node in the device tree
* to "disabled" if that hart is in disabled state in OpenSBI.
*
* It is recommended that platform codes call this helper in their final_init()
*
* @param fdt: device tree blob
*/
void fdt_cpu_fixup(void *fdt);
/**
* Fix up the APLIC nodes in the device tree
*
* This routine disables APLIC nodes which are not accessible to the next
* booting stage based on currently assigned domain.
*
* It is recommended that platform codes call this helper in their final_init()
*
* @param fdt: device tree blob
*/
void fdt_aplic_fixup(void *fdt);
/**
* Fix up the IMSIC nodes in the device tree
*
* This routine disables IMSIC nodes which are not accessible to the next
* booting stage based on currently assigned domain.
*
* It is recommended that platform codes call this helper in their final_init()
*
* @param fdt: device tree blob
*/
void fdt_imsic_fixup(void *fdt);
/**
* Fix up the PLIC node in the device tree
*
* This routine updates the "interrupt-extended" property of the PLIC node in
* the device tree to hide the M-mode external interrupt from CPUs.
*
* It is recommended that platform codes call this helper in their final_init()
*
* @param fdt: device tree blob
*/
void fdt_plic_fixup(void *fdt);
/**
* Fix up the reserved memory node in the device tree
*
* This routine inserts a child node of the reserved memory node in the device
* tree that describes the protected memory region done by OpenSBI via PMP.
*
* It is recommended that platform codes call this helper in their final_init()
*
* @param fdt: device tree blob
* @return zero on success and -ve on failure
*/
int fdt_reserved_memory_fixup(void *fdt);
/**
* Fix up the reserved memory subnodes in the device tree
*
* This routine adds the no-map property to the reserved memory subnodes so
* that the OS does not map those PMP protected memory regions.
*
* Platform codes must call this helper in their final_init() after fdt_fixups()
* if the OS should not map the PMP protected reserved regions.
*
* @param fdt: device tree blob
* @return zero on success and -ve on failure
*/
int fdt_reserved_memory_nomap_fixup(void *fdt);
/**
* General device tree fix-up
*
* This routine do all required device tree fix-ups for a typical platform.
* It fixes up the PLIC node, IMSIC nodes, APLIC nodes, and the reserved
* memory node in the device tree by calling the corresponding helper
* routines to accomplish the task.
*
* It is recommended that platform codes call this helper in their final_init()
*
* @param fdt: device tree blob
*/
void fdt_fixups(void *fdt);
#endif /* __FDT_FIXUP_H__ */
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