forked from Mirrors/opensbi
9d760b810e
It should possible to fixup FDT from any part of OpenSBI so add fdt_register_general_fixup() which allows dynamic registration of FDT fixup callbacks. Signed-off-by: Anup Patel <apatel@ventanamicro.com>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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* fdt_fixup.h - Flat Device Tree manipulation helper routines
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* Implement platform specific DT fixups on top of libfdt.
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*
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* Copyright (C) 2020 Bin Meng <bmeng.cn@gmail.com>
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*/
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#ifndef __FDT_FIXUP_H__
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#define __FDT_FIXUP_H__
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#include <sbi/sbi_list.h>
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struct sbi_cpu_idle_state {
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const char *name;
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uint32_t suspend_param;
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bool local_timer_stop;
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uint32_t entry_latency_us;
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uint32_t exit_latency_us;
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uint32_t min_residency_us;
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uint32_t wakeup_latency_us;
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};
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/**
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* Add CPU idle states to cpu nodes in the DT
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*
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* Add information about CPU idle states to the devicetree. This function
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* assumes that CPU idle states are not already present in the devicetree, and
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* that all CPU states are equally applicable to all CPUs.
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*
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* @param fdt: device tree blob
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* @param states: array of idle state descriptions, ending with empty element
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* @return zero on success and -ve on failure
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*/
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int fdt_add_cpu_idle_states(void *fdt, const struct sbi_cpu_idle_state *state);
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/**
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* Fix up the CPU node in the device tree
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*
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* This routine updates the "status" property of a CPU node in the device tree
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* to "disabled" if that hart is in disabled state in OpenSBI.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_cpu_fixup(void *fdt);
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/**
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* Fix up the APLIC nodes in the device tree
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*
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* This routine disables APLIC nodes which are not accessible to the next
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* booting stage based on currently assigned domain.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_aplic_fixup(void *fdt);
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/**
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* Fix up the IMSIC nodes in the device tree
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*
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* This routine disables IMSIC nodes which are not accessible to the next
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* booting stage based on currently assigned domain.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_imsic_fixup(void *fdt);
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/**
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* Fix up the PLIC node in the device tree
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*
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* This routine updates the "interrupt-extended" property of the PLIC node in
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* the device tree to hide the M-mode external interrupt from CPUs.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_plic_fixup(void *fdt);
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/**
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* Fix up the reserved memory node in the device tree
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*
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* This routine inserts a child node of the reserved memory node in the device
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* tree that describes the protected memory region done by OpenSBI via PMP.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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* @return zero on success and -ve on failure
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*/
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int fdt_reserved_memory_fixup(void *fdt);
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/** Representation of a general fixup */
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struct fdt_general_fixup {
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struct sbi_dlist head;
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const char *name;
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void (*do_fixup)(struct fdt_general_fixup *f, void *fdt);
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};
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/** Register a general fixup */
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int fdt_register_general_fixup(struct fdt_general_fixup *fixup);
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/** UnRegister a general fixup */
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void fdt_unregister_general_fixup(struct fdt_general_fixup *fixup);
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/**
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* General device tree fix-up
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*
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* This routine do all required device tree fix-ups for a typical platform.
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* It fixes up the PLIC node, IMSIC nodes, APLIC nodes, and the reserved
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* memory node in the device tree by calling the corresponding helper
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* routines to accomplish the task.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_fixups(void *fdt);
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#endif /* __FDT_FIXUP_H__ */
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