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102 lines
2.5 KiB
102 lines
2.5 KiB
// 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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