sh: Support fixed 32-bit PMB mappings from bootloader.
[linux-2.6] / arch / sh / mm / cache-sh2.c
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
19 void __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 =  ctrl_inl(addr | (way << 12));
32                         if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
33                                 data &= ~SH_CACHE_UPDATED;
34                                 ctrl_outl(data, addr | (way << 12));
35                         }
36                 }
37         }
38 }
39
40 void __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                 ctrl_outl((v & CACHE_PHYSADDR_MASK),
51                           CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
52 }
53
54 void __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 = ctrl_inl(CCR);
67         ccr |= CCR_CACHE_INVALIDATE;
68         ctrl_outl(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                 ctrl_outl((v & CACHE_PHYSADDR_MASK),
82                           CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
83 #endif
84 }