1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/sh/mm/cache-sh2.c
4 *
5 * Copyright (C) 2002 Paul Mundt
6 * Copyright (C) 2008 Yoshinori Sato
7 */
8
9 #include <linux/init.h>
10 #include <linux/mm.h>
11
12 #include <asm/cache.h>
13 #include <asm/addrspace.h>
14 #include <asm/processor.h>
15 #include <asm/cacheflush.h>
16 #include <asm/io.h>
17
18 static void sh2__flush_wback_region(void *start, int size)
19 {
20 unsigned long v;
21 unsigned long begin, end;
22
23 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
24 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
25 & ~(L1_CACHE_BYTES-1);
26 for (v = begin; v < end; v+=L1_CACHE_BYTES) {
27 unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0);
28 int way;
29 for (way = 0; way < 4; way++) {
30 unsigned long data = __raw_readl(addr | (way << 12));
31 if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
32 data &= ~SH_CACHE_UPDATED;
33 __raw_writel(data, addr | (way << 12));
34 }
35 }
36 }
37 }
38
39 static void sh2__flush_purge_region(void *start, int size)
40 {
41 unsigned long v;
42 unsigned long begin, end;
43
44 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
45 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
46 & ~(L1_CACHE_BYTES-1);
47
48 for (v = begin; v < end; v+=L1_CACHE_BYTES)
49 __raw_writel((v & CACHE_PHYSADDR_MASK),
50 CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
51 }
52
53 static void sh2__flush_invalidate_region(void *start, int size)
54 {
55 #ifdef CONFIG_CACHE_WRITEBACK
56 /*
57 * SH-2 does not support individual line invalidation, only a
58 * global invalidate.
59 */
60 unsigned long ccr;
61 unsigned long flags;
62 local_irq_save(flags);
63 jump_to_uncached();
64
65 ccr = __raw_readl(SH_CCR);
66 ccr |= CCR_CACHE_INVALIDATE;
67 __raw_writel(ccr, SH_CCR);
68
69 back_to_cached();
70 local_irq_restore(flags);
71 #else
72 unsigned long v;
73 unsigned long begin, end;
74
75 begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
76 end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
77 & ~(L1_CACHE_BYTES-1);
78
79 for (v = begin; v < end; v+=L1_CACHE_BYTES)
80 __raw_writel((v & CACHE_PHYSADDR_MASK),
81 CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
82 #endif
83 }
84
85 void __init sh2_cache_init(void)
86 {
87 __flush_wback_region = sh2__flush_wback_region;
88 __flush_purge_region = sh2__flush_purge_region;
89 __flush_invalidate_region = sh2__flush_invalidate_region;
90 }
91
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