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
35static void sh3__flush_wback_region(void *start, int size)
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;
47		for (j = 0; j < current_cpu_data.dcache.ways; j++) {
48			unsigned long data, addr, p;
49
50			p = __pa(v);
51			addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
52			local_irq_save(flags);
53			data = __raw_readl(addr);
54
55			if ((data & CACHE_PHYSADDR_MASK) ==
56			    (p & CACHE_PHYSADDR_MASK)) {
57				data &= ~SH_CACHE_UPDATED;
58				__raw_writel(data, addr);
59				local_irq_restore(flags);
60				break;
61			}
62			local_irq_restore(flags);
63			addrstart += current_cpu_data.dcache.way_incr;
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 */
74static void sh3__flush_purge_region(void *start, int size)
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 |
88			(v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
89		__raw_writel(data, addr);
90	}
91}
92
93void __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}
106