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// SPDX-License-Identifier: BSD-2-Clause
/*
* fdt_helper.h - Flat Device Tree manipulation helper routines
* Implement helper routines on top of libfdt for OpenSBI usage
*
* Copyright (C) 2020 Bin Meng <bmeng.cn@gmail.com>
*/
#ifndef __FDT_HELPER_H__
#define __FDT_HELPER_H__
struct platform_uart_data {
unsigned long addr;
unsigned long freq;
unsigned long baud;
};
struct platform_plic_data {
unsigned long addr;
unsigned long num_src;
};
int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
const char *compatible);
int fdt_parse_plic(void *fdt, struct platform_plic_data *plic,
const char *compatible);
int fdt_parse_clint(void *fdt, unsigned long *clint_addr,
const char *compatible);
/**
* 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 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
* @param compat: PLIC node compatible string
*/
void fdt_plic_fixup(void *fdt, const char *compat);
/**
* 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);
/**
* General device tree fix-up
*
* This routine do all required device tree fix-ups for a typical platform.
* It fixes up the PLIC node 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_HELPER_H__ */
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