forked from Mirrors/opensbi

Add a new Andes SBI call to free a PMA entry, and reset the memory attributes for the corresponding NAPOT region. Signed-off-by: Ben Zong-You Xie <ben717@andestech.com> Reviewed-by: Anup Patel <anup@brainfault.org>
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2023 Renesas Electronics Corp.
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*/
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#ifndef _ANDES_PMA_H_
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#define _ANDES_PMA_H_
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#include <sbi/sbi_types.h>
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#define ANDES_MAX_PMA_REGIONS 16
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#define ANDES_PMA_GRANULARITY (1 << 12)
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#define ANDES_PMACFG_ETYP_OFFSET 0
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#define ANDES_PMACFG_ETYP_MASK (3 << ANDES_PMACFG_ETYP_OFFSET)
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#define ANDES_PMACFG_ETYP_OFF (0 << ANDES_PMACFG_ETYP_OFFSET)
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/* Naturally aligned power of 2 region */
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#define ANDES_PMACFG_ETYP_NAPOT (3 << ANDES_PMACFG_ETYP_OFFSET)
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#define ANDES_PMACFG_MTYP_OFFSET 2
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/* Memory, Non-cacheable, Bufferable */
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#define ANDES_PMACFG_MTYP_MEM_NON_CACHE_BUF (3 << ANDES_PMACFG_MTYP_OFFSET)
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/**
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* struct andes_pma_region - Describes PMA regions
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*
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* @pa: Address to be configured in the PMA
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* @size: Size of the region
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* @flags: Flags to be set for the PMA region
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* @dt_populate: Boolean flag indicating if the DT entry should be
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* populated for the given PMA region
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* @shared_dma: Boolean flag if set "shared-dma-pool" property will
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* be set in the DT node
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* @no_map: Boolean flag if set "no-map" property will be set in the
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* DT node
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* @dma_default: Boolean flag if set "linux,dma-default" property will
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* be set in the DT node. Note Linux expects single node
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* with this property set.
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*/
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struct andes_pma_region {
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unsigned long pa;
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unsigned long size;
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u8 flags:7;
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bool dt_populate;
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bool shared_dma;
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bool no_map;
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bool dma_default;
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};
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int andes_pma_setup_regions(const struct andes_pma_region *pma_regions,
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unsigned int pma_regions_count);
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/**
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* Programmable PMA(PPMA) is a feature for Andes. PPMA allows dynamic adjustment
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* of memory attributes in the runtime. It contains a configurable amount of PMA
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* entries implemented as CSRs to control the attributes of memory locations.
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*
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* Check if hardware supports PPMA
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*
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* @return true if PPMA is supported
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* @return false if PPMA is not supported
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*/
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bool andes_sbi_probe_pma(void);
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/**
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* Set a NAPOT region with given memory attributes
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* @param pa: Start address of the NAPOT region
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* @param size: Size of the NAPOT region
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* @param flags: Memory attributes set to the NAPOT region
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*
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* @return SBI_SUCCESS on success
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* @return SBI_ERR_NOT_SUPPORTED if hardware does not support PPMA features
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* @return SBI_ERR_INVALID_PARAM if the given region is overlapped with the
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* region that has been set already
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* @return SBI_ERR_FAILED if available entries have run out or setup fails
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*/
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int andes_sbi_set_pma(unsigned long pa, unsigned long size, u8 flags);
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/**
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* Reset the memory attribute of a NAPOT region
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* @param pa Start address of the NAPOT region
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*
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* @return SBI_SUCCESS on success
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* @return SBI_ERR_FAILED if the given region is not set before
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*/
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int andes_sbi_free_pma(unsigned long pa);
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#endif /* _ANDES_PMA_H_ */
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