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Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
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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 | static 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 | */ |
74 | static 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 | |
93 | void __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 |
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v2.6.34-rc5
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