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
__flush_wback_region(void * start,int size)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 */
__flush_purge_region(void * start,int size)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")));
101