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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/mm/cache-sh3.c
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// 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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