[deliverable/linux.git] / arch / sh / mm / cache-sh3.c

/*
 * arch/sh/mm/cache-sh3.c
 *
 * Copyright (C) 1999, 2000  Niibe Yutaka
 * Copyright (C) 2002 Paul Mundt
 *
 * Released under the terms of the GNU GPL v2.0.
 */

#include <linux/init.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/threads.h>
#include <asm/addrspace.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>

/*
 * Write back the dirty D-caches, but not invalidate them.
 *
 * Is this really worth it, or should we just alias this routine
 * to __flush_purge_region too?
 *
 * START: Virtual Address (U0, P1, or P3)
 * SIZE: Size of the region.
 */

static void sh3__flush_wback_region(void *start, int size)
{
	unsigned long v, j;
	unsigned long begin, end;
	unsigned long flags;

	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
		& ~(L1_CACHE_BYTES-1);

	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
		unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
		for (j = 0; j < current_cpu_data.dcache.ways; j++) {
			unsigned long data, addr, p;

			p = __pa(v);
			addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
			local_irq_save(flags);
			data = __raw_readl(addr);

			if ((data & CACHE_PHYSADDR_MASK) ==
			    (p & CACHE_PHYSADDR_MASK)) {
				data &= ~SH_CACHE_UPDATED;
				__raw_writel(data, addr);
				local_irq_restore(flags);
				break;
			}
			local_irq_restore(flags);
			addrstart += current_cpu_data.dcache.way_incr;
		}
	}
}

/*
 * Write back the dirty D-caches and invalidate them.
 *
 * START: Virtual Address (U0, P1, or P3)
 * SIZE: Size of the region.
 */
static void sh3__flush_purge_region(void *start, int size)
{
	unsigned long v;
	unsigned long begin, end;

	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
		& ~(L1_CACHE_BYTES-1);

	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
		unsigned long data, addr;

		data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
		addr = CACHE_OC_ADDRESS_ARRAY |
			(v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
		__raw_writel(data, addr);
	}
}

void __init sh3_cache_init(void)
{
	__flush_wback_region = sh3__flush_wback_region;
	__flush_purge_region = sh3__flush_purge_region;

	/*
	 * No write back please
	 *
	 * Except I don't think there's any way to avoid the writeback.
	 * So we just alias it to sh3__flush_purge_region(). dwmw2.
	 */
	__flush_invalidate_region = sh3__flush_purge_region;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* arch/sh/mm/cache-sh3.c
	3	*
	4	* Copyright (C) 1999, 2000 Niibe Yutaka
	5	* Copyright (C) 2002 Paul Mundt
	6	*
	7	* Released under the terms of the GNU GPL v2.0.
	8	*/
	9
	10	#include <linux/init.h>
	11	#include <linux/mman.h>
	12	#include <linux/mm.h>
	13	#include <linux/threads.h>
	14	#include <asm/addrspace.h>
	15	#include <asm/page.h>
	16	#include <asm/pgtable.h>
	17	#include <asm/processor.h>
	18	#include <asm/cache.h>
	19	#include <asm/io.h>
	20	#include <asm/uaccess.h>
	21	#include <asm/pgalloc.h>
	22	#include <asm/mmu_context.h>
	23	#include <asm/cacheflush.h>
	24
	25	/*
	26	* Write back the dirty D-caches, but not invalidate them.
	27	*
	28	* Is this really worth it, or should we just alias this routine
	29	* to __flush_purge_region too?
	30	*
	31	* START: Virtual Address (U0, P1, or P3)
	32	* SIZE: Size of the region.
	33	*/
	34
79f1c9da	35	static void sh3__flush_wback_region(void *start, int size)
1da177e4 LT	36	{
	37	unsigned long v, j;
	38	unsigned long begin, end;
	39	unsigned long flags;
	40
	41	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
	42	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
	43	& ~(L1_CACHE_BYTES-1);
	44
	45	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
	46	unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
11c19656	47	for (j = 0; j < current_cpu_data.dcache.ways; j++) {
1da177e4 LT	48	unsigned long data, addr, p;
	49
	50	p = __pa(v);
11c19656	51	addr = addrstart \| (v & current_cpu_data.dcache.entry_mask);
1da177e4	52	local_irq_save(flags);
9d56dd3b	53	data = __raw_readl(addr);
1da177e4 LT	54
	55	if ((data & CACHE_PHYSADDR_MASK) ==
	56	(p & CACHE_PHYSADDR_MASK)) {
	57	data &= ~SH_CACHE_UPDATED;
9d56dd3b	58	__raw_writel(data, addr);
1da177e4 LT	59	local_irq_restore(flags);
	60	break;
	61	}
	62	local_irq_restore(flags);
11c19656	63	addrstart += current_cpu_data.dcache.way_incr;
1da177e4 LT	64	}
	65	}
	66	}
	67
	68	/*
	69	* Write back the dirty D-caches and invalidate them.
	70	*
	71	* START: Virtual Address (U0, P1, or P3)
	72	* SIZE: Size of the region.
	73	*/
79f1c9da	74	static void sh3__flush_purge_region(void *start, int size)
1da177e4 LT	75	{
	76	unsigned long v;
	77	unsigned long begin, end;
	78
	79	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
	80	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
	81	& ~(L1_CACHE_BYTES-1);
	82
	83	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
	84	unsigned long data, addr;
	85
	86	data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
	87	addr = CACHE_OC_ADDRESS_ARRAY \|
11c19656	88	(v & current_cpu_data.dcache.entry_mask) \| SH_CACHE_ASSOC;
9d56dd3b	89	__raw_writel(data, addr);
1da177e4 LT	90	}
	91	}
	92
79f1c9da PM	93	void __init sh3_cache_init(void)
	94	{
	95	__flush_wback_region = sh3__flush_wback_region;
	96	__flush_purge_region = sh3__flush_purge_region;
	97
	98	/*
	99	* No write back please
	100	*
	101	* Except I don't think there's any way to avoid the writeback.
	102	* So we just alias it to sh3__flush_purge_region(). dwmw2.
	103	*/
	104	__flush_invalidate_region = sh3__flush_purge_region;
	105	}