110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
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/*
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* Copyright (C) 2014 Imagination Technologies
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* Author: Paul Burton <paul.burton@imgtec.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef __MIPS_ASM_MIPS_MAAR_H__
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#define __MIPS_ASM_MIPS_MAAR_H__
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#include <asm/hazards.h>
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#include <asm/mipsregs.h>
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/**
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* platform_maar_init() - perform platform-level MAAR configuration
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* @num_pairs: The number of MAAR pairs present in the system.
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*
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* Platforms should implement this function such that it configures as many
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* MAAR pairs as required, from 0 up to the maximum of num_pairs-1, and returns
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* the number that were used. Any further MAARs will be configured to be
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* invalid. The default implementation of this function will simply indicate
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* that it has configured 0 MAAR pairs.
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*
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* Return: The number of MAAR pairs configured.
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*/
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unsigned __weak platform_maar_init(unsigned num_pairs);
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/**
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* write_maar_pair() - write to a pair of MAARs
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* @idx: The index of the pair (ie. use MAARs idx*2 & (idx*2)+1).
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* @lower: The lowest address that the MAAR pair will affect. Must be
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* aligned to a 2^16 byte boundary.
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* @upper: The highest address that the MAAR pair will affect. Must be
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* aligned to one byte before a 2^16 byte boundary.
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* @attrs: The accessibility attributes to program, eg. MIPS_MAAR_S. The
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* MIPS_MAAR_V attribute will automatically be set.
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*
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* Program the pair of MAAR registers specified by idx to apply the attributes
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* specified by attrs to the range of addresses from lower to higher.
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*/
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static inline void write_maar_pair(unsigned idx, phys_addr_t lower,
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phys_addr_t upper, unsigned attrs)
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{
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/* Addresses begin at bit 16, but are shifted right 4 bits */
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BUG_ON(lower & (0xffff | ~(MIPS_MAAR_ADDR << 4)));
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BUG_ON(((upper & 0xffff) != 0xffff)
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|| ((upper & ~0xffffull) & ~(MIPS_MAAR_ADDR << 4)));
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/* Automatically set MIPS_MAAR_V */
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attrs |= MIPS_MAAR_V;
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/* Write the upper address & attributes (only MIPS_MAAR_V matters) */
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write_c0_maari(idx << 1);
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back_to_back_c0_hazard();
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write_c0_maar(((upper >> 4) & MIPS_MAAR_ADDR) | attrs);
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back_to_back_c0_hazard();
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/* Write the lower address & attributes */
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write_c0_maari((idx << 1) | 0x1);
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back_to_back_c0_hazard();
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write_c0_maar((lower >> 4) | attrs);
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back_to_back_c0_hazard();
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}
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/**
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* struct maar_config - MAAR configuration data
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* @lower: The lowest address that the MAAR pair will affect. Must be
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* aligned to a 2^16 byte boundary.
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* @upper: The highest address that the MAAR pair will affect. Must be
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* aligned to one byte before a 2^16 byte boundary.
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* @attrs: The accessibility attributes to program, eg. MIPS_MAAR_S. The
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* MIPS_MAAR_V attribute will automatically be set.
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*
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* Describes the configuration of a pair of Memory Accessibility Attribute
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* Registers - applying attributes from attrs to the range of physical
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* addresses from lower to upper inclusive.
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*/
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struct maar_config {
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phys_addr_t lower;
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phys_addr_t upper;
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unsigned attrs;
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};
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/**
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* maar_config() - configure MAARs according to provided data
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* @cfg: Pointer to an array of struct maar_config.
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* @num_cfg: The number of structs in the cfg array.
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* @num_pairs: The number of MAAR pairs present in the system.
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*
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* Configures as many MAARs as are present and specified in the cfg
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* array with the values taken from the cfg array.
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*
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* Return: The number of MAAR pairs configured.
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*/
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static inline unsigned maar_config(const struct maar_config *cfg,
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unsigned num_cfg, unsigned num_pairs)
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{
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unsigned i;
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for (i = 0; i < min(num_cfg, num_pairs); i++)
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write_maar_pair(i, cfg[i].lower, cfg[i].upper, cfg[i].attrs);
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return i;
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}
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#endif /* __MIPS_ASM_MIPS_MAAR_H__ */
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