1 /*
2 * arch/sh/mm/cache-sh2.c
3 *
4 * Copyright (C) 2002 Paul Mundt
5 * Copyright (C) 2008 Yoshinori Sato
6 *
7 * Released under the terms of the GNU GPL v2.0.
8 */
9
10 #include <linux/init.h>
11 #include <linux/mm.h>
12
13 #include <asm/cache.h>
14 #include <asm/addrspace.h>
15 #include <asm/processor.h>
16 #include <asm/cacheflush.h>
17 #include <asm/io.h>
18
sh2__flush_wback_region(void * start,int size)19 static void sh2__flush_wback_region(void *start, int size)
20 {
21 unsigned long v;
22 unsigned long begin, end;
23
24 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
25 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
26 & ~(L1_CACHE_BYTES-1);
27 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
28 unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0);
29 int way;
30 for (way = 0; way < 4; way++) {
31 unsigned long data = __raw_readl(addr | (way << 12));
32 if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
33 data &= ~SH_CACHE_UPDATED;
34 __raw_writel(data, addr | (way << 12));
35 }
36 }
37 }
38 }
39
sh2__flush_purge_region(void * start,int size)40 static void sh2__flush_purge_region(void *start, int size)
41 {
42 unsigned long v;
43 unsigned long begin, end;
44
45 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
46 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
47 & ~(L1_CACHE_BYTES-1);
48
49 for (v = begin; v < end; v+=L1_CACHE_BYTES)
50 __raw_writel((v & CACHE_PHYSADDR_MASK),
51 CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
52 }
53
sh2__flush_invalidate_region(void * start,int size)54 static void sh2__flush_invalidate_region(void *start, int size)
55 {
56 #ifdef CONFIG_CACHE_WRITEBACK
57 /*
58 * SH-2 does not support individual line invalidation, only a
59 * global invalidate.
60 */
61 unsigned long ccr;
62 unsigned long flags;
63 local_irq_save(flags);
64 jump_to_uncached();
65
66 ccr = __raw_readl(CCR);
67 ccr |= CCR_CACHE_INVALIDATE;
68 __raw_writel(ccr, CCR);
69
70 back_to_cached();
71 local_irq_restore(flags);
72 #else
73 unsigned long v;
74 unsigned long begin, end;
75
76 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
77 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
78 & ~(L1_CACHE_BYTES-1);
79
80 for (v = begin; v < end; v+=L1_CACHE_BYTES)
81 __raw_writel((v & CACHE_PHYSADDR_MASK),
82 CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
83 #endif
84 }
85
sh2_cache_init(void)86 void __init sh2_cache_init(void)
87 {
88 __flush_wback_region = sh2__flush_wback_region;
89 __flush_purge_region = sh2__flush_purge_region;
90 __flush_invalidate_region = sh2__flush_invalidate_region;
91 }
92