Merge branch 'next-i2c' of git://aeryn.fluff.org.uk/bjdooks/linux
[linux-2.6] / arch / sh / mm / cache-sh3.c
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
35 void __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 = ctrl_inl(addr);
54
55                         if ((data & CACHE_PHYSADDR_MASK) ==
56                             (p & CACHE_PHYSADDR_MASK)) {
57                                 data &= ~SH_CACHE_UPDATED;
58                                 ctrl_outl(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  */
74 void __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                 ctrl_outl(data, addr);
90         }
91 }
92
93 /*
94  * No write back please
95  *
96  * Except I don't think there's any way to avoid the writeback. So we
97  * just alias it to __flush_purge_region(). dwmw2.
98  */
99 void __flush_invalidate_region(void *start, int size)
100         __attribute__((alias("__flush_purge_region")));