1/* Functions for global dcache flush when writeback caching in SMP
2 *
3 * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#include <linux/mm.h>
12#include <asm/cacheflush.h>
13#include "cache-smp.h"
14
15/**
16 * mn10300_dcache_flush - Globally flush data cache
17 *
18 * Flush the data cache on all CPUs.
19 */
20void mn10300_dcache_flush(void)
21{
22	unsigned long flags;
23
24	flags = smp_lock_cache();
25	mn10300_local_dcache_flush();
26	smp_cache_call(SMP_DCACHE_FLUSH, 0, 0);
27	smp_unlock_cache(flags);
28}
29
30/**
31 * mn10300_dcache_flush_page - Globally flush a page of data cache
32 * @start: The address of the page of memory to be flushed.
33 *
34 * Flush a range of addresses in the data cache on all CPUs covering
35 * the page that includes the given address.
36 */
37void mn10300_dcache_flush_page(unsigned long start)
38{
39	unsigned long flags;
40
41	start &= ~(PAGE_SIZE-1);
42
43	flags = smp_lock_cache();
44	mn10300_local_dcache_flush_page(start);
45	smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, start + PAGE_SIZE);
46	smp_unlock_cache(flags);
47}
48
49/**
50 * mn10300_dcache_flush_range - Globally flush range of data cache
51 * @start: The start address of the region to be flushed.
52 * @end: The end address of the region to be flushed.
53 *
54 * Flush a range of addresses in the data cache on all CPUs, between start and
55 * end-1 inclusive.
56 */
57void mn10300_dcache_flush_range(unsigned long start, unsigned long end)
58{
59	unsigned long flags;
60
61	flags = smp_lock_cache();
62	mn10300_local_dcache_flush_range(start, end);
63	smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, end);
64	smp_unlock_cache(flags);
65}
66
67/**
68 * mn10300_dcache_flush_range2 - Globally flush range of data cache
69 * @start: The start address of the region to be flushed.
70 * @size: The size of the region to be flushed.
71 *
72 * Flush a range of addresses in the data cache on all CPUs, between start and
73 * start+size-1 inclusive.
74 */
75void mn10300_dcache_flush_range2(unsigned long start, unsigned long size)
76{
77	unsigned long flags;
78
79	flags = smp_lock_cache();
80	mn10300_local_dcache_flush_range2(start, size);
81	smp_cache_call(SMP_DCACHE_FLUSH_RANGE, start, start + size);
82	smp_unlock_cache(flags);
83}
84
85/**
86 * mn10300_dcache_flush_inv - Globally flush and invalidate data cache
87 *
88 * Flush and invalidate the data cache on all CPUs.
89 */
90void mn10300_dcache_flush_inv(void)
91{
92	unsigned long flags;
93
94	flags = smp_lock_cache();
95	mn10300_local_dcache_flush_inv();
96	smp_cache_call(SMP_DCACHE_FLUSH_INV, 0, 0);
97	smp_unlock_cache(flags);
98}
99
100/**
101 * mn10300_dcache_flush_inv_page - Globally flush and invalidate a page of data
102 *	cache
103 * @start: The address of the page of memory to be flushed and invalidated.
104 *
105 * Flush and invalidate a range of addresses in the data cache on all CPUs
106 * covering the page that includes the given address.
107 */
108void mn10300_dcache_flush_inv_page(unsigned long start)
109{
110	unsigned long flags;
111
112	start &= ~(PAGE_SIZE-1);
113
114	flags = smp_lock_cache();
115	mn10300_local_dcache_flush_inv_page(start);
116	smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, start + PAGE_SIZE);
117	smp_unlock_cache(flags);
118}
119
120/**
121 * mn10300_dcache_flush_inv_range - Globally flush and invalidate range of data
122 *	cache
123 * @start: The start address of the region to be flushed and invalidated.
124 * @end: The end address of the region to be flushed and invalidated.
125 *
126 * Flush and invalidate a range of addresses in the data cache on all CPUs,
127 * between start and end-1 inclusive.
128 */
129void mn10300_dcache_flush_inv_range(unsigned long start, unsigned long end)
130{
131	unsigned long flags;
132
133	flags = smp_lock_cache();
134	mn10300_local_dcache_flush_inv_range(start, end);
135	smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, end);
136	smp_unlock_cache(flags);
137}
138
139/**
140 * mn10300_dcache_flush_inv_range2 - Globally flush and invalidate range of data
141 *	cache
142 * @start: The start address of the region to be flushed and invalidated.
143 * @size: The size of the region to be flushed and invalidated.
144 *
145 * Flush and invalidate a range of addresses in the data cache on all CPUs,
146 * between start and start+size-1 inclusive.
147 */
148void mn10300_dcache_flush_inv_range2(unsigned long start, unsigned long size)
149{
150	unsigned long flags;
151
152	flags = smp_lock_cache();
153	mn10300_local_dcache_flush_inv_range2(start, size);
154	smp_cache_call(SMP_DCACHE_FLUSH_INV_RANGE, start, start + size);
155	smp_unlock_cache(flags);
156}
157