mirror of https://gitee.com/openkylin/linux.git
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/sh/mm/cache-sh3.c
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*
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* Copyright (C) 1999, 2000 Niibe Yutaka
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* Copyright (C) 2002 Paul Mundt
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*/
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#include <linux/init.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/threads.h>
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#include <asm/addrspace.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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#include <asm/cache.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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/*
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* Write back the dirty D-caches, but not invalidate them.
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*
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* Is this really worth it, or should we just alias this routine
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* to __flush_purge_region too?
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*
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* START: Virtual Address (U0, P1, or P3)
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* SIZE: Size of the region.
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*/
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static void sh3__flush_wback_region(void *start, int size)
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{
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unsigned long v, j;
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unsigned long begin, end;
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unsigned long flags;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
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for (j = 0; j < current_cpu_data.dcache.ways; j++) {
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unsigned long data, addr, p;
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p = __pa(v);
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addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
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local_irq_save(flags);
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data = __raw_readl(addr);
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if ((data & CACHE_PHYSADDR_MASK) ==
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(p & CACHE_PHYSADDR_MASK)) {
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data &= ~SH_CACHE_UPDATED;
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__raw_writel(data, addr);
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local_irq_restore(flags);
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break;
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}
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local_irq_restore(flags);
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addrstart += current_cpu_data.dcache.way_incr;
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}
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}
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}
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/*
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* Write back the dirty D-caches and invalidate them.
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*
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* START: Virtual Address (U0, P1, or P3)
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* SIZE: Size of the region.
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*/
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static void sh3__flush_purge_region(void *start, int size)
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{
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unsigned long v;
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unsigned long begin, end;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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unsigned long data, addr;
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data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
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addr = CACHE_OC_ADDRESS_ARRAY |
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(v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
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__raw_writel(data, addr);
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}
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}
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void __init sh3_cache_init(void)
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{
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__flush_wback_region = sh3__flush_wback_region;
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__flush_purge_region = sh3__flush_purge_region;
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/*
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* No write back please
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*
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* Except I don't think there's any way to avoid the writeback.
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* So we just alias it to sh3__flush_purge_region(). dwmw2.
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*/
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__flush_invalidate_region = sh3__flush_purge_region;
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}
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