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Richard Kuo2d3cbc72011-10-31 18:50:51 -05001/*
2 * Cache management functions for Hexagon
3 *
Richard Kuoe1858b22012-09-19 16:22:02 -05004 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
Richard Kuo2d3cbc72011-10-31 18:50:51 -05005 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#include <linux/mm.h>
22#include <asm/cacheflush.h>
23#include <asm/hexagon_vm.h>
24
25#define spanlines(start, end) \
26 (((end - (start & ~(LINESIZE - 1))) >> LINEBITS) + 1)
27
28void flush_dcache_range(unsigned long start, unsigned long end)
29{
30 unsigned long lines = spanlines(start, end-1);
31 unsigned long i, flags;
32
33 start &= ~(LINESIZE - 1);
34
35 local_irq_save(flags);
36
37 for (i = 0; i < lines; i++) {
38 __asm__ __volatile__ (
39 " dccleaninva(%0); "
40 :
41 : "r" (start)
42 );
43 start += LINESIZE;
44 }
45 local_irq_restore(flags);
46}
47
48void flush_icache_range(unsigned long start, unsigned long end)
49{
50 unsigned long lines = spanlines(start, end-1);
51 unsigned long i, flags;
52
53 start &= ~(LINESIZE - 1);
54
55 local_irq_save(flags);
56
57 for (i = 0; i < lines; i++) {
58 __asm__ __volatile__ (
59 " dccleana(%0); "
60 " icinva(%0); "
61 :
62 : "r" (start)
63 );
64 start += LINESIZE;
65 }
66 __asm__ __volatile__ (
67 "isync"
68 );
69 local_irq_restore(flags);
70}
71
72void hexagon_clean_dcache_range(unsigned long start, unsigned long end)
73{
74 unsigned long lines = spanlines(start, end-1);
75 unsigned long i, flags;
76
77 start &= ~(LINESIZE - 1);
78
79 local_irq_save(flags);
80
81 for (i = 0; i < lines; i++) {
82 __asm__ __volatile__ (
83 " dccleana(%0); "
84 :
85 : "r" (start)
86 );
87 start += LINESIZE;
88 }
89 local_irq_restore(flags);
90}
91
92void hexagon_inv_dcache_range(unsigned long start, unsigned long end)
93{
94 unsigned long lines = spanlines(start, end-1);
95 unsigned long i, flags;
96
97 start &= ~(LINESIZE - 1);
98
99 local_irq_save(flags);
100
101 for (i = 0; i < lines; i++) {
102 __asm__ __volatile__ (
103 " dcinva(%0); "
104 :
105 : "r" (start)
106 );
107 start += LINESIZE;
108 }
109 local_irq_restore(flags);
110}
111
112
113
114
115/*
116 * This is just really brutal and shouldn't be used anyways,
117 * especially on V2. Left here just in case.
118 */
119void flush_cache_all_hexagon(void)
120{
121 unsigned long flags;
122 local_irq_save(flags);
123 __vmcache_ickill();
124 __vmcache_dckill();
125 __vmcache_l2kill();
126 local_irq_restore(flags);
127 mb();
128}