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These can be used by platform code to save the PLIC priority state, if it would otherwise be lost during non-retentive suspend. The platform is responsible for allocating all necessary storage. As a space optimization, store the saved priority values as 8-bit integers, since that is large enough to hold any priority value on the relevant platforms. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Samuel Holland <samuel@sholland.org>
40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef __IRQCHIP_PLIC_H__
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#define __IRQCHIP_PLIC_H__
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#include <sbi/sbi_types.h>
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struct plic_data {
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unsigned long addr;
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unsigned long num_src;
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};
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/* So far, priorities on all consumers of these functions fit in 8 bits. */
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void plic_priority_save(const struct plic_data *plic, u8 *priority);
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void plic_priority_restore(const struct plic_data *plic, const u8 *priority);
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void plic_context_save(const struct plic_data *plic, int context_id,
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u32 *enable, u32 *threshold);
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void plic_context_restore(const struct plic_data *plic, int context_id,
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const u32 *enable, u32 threshold);
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int plic_context_init(const struct plic_data *plic, int context_id,
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bool enable, u32 threshold);
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int plic_warm_irqchip_init(const struct plic_data *plic,
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int m_cntx_id, int s_cntx_id);
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int plic_cold_irqchip_init(const struct plic_data *plic);
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#endif
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