1/*
2 * Cache management functions for Hexagon
3 *
4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
5 *
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}
71EXPORT_SYMBOL(flush_icache_range);
72
73void hexagon_clean_dcache_range(unsigned long start, unsigned long end)
74{
75	unsigned long lines = spanlines(start, end-1);
76	unsigned long i, flags;
77
78	start &= ~(LINESIZE - 1);
79
80	local_irq_save(flags);
81
82	for (i = 0; i < lines; i++) {
83		__asm__ __volatile__ (
84		"	dccleana(%0);	"
85		:
86		: "r" (start)
87		);
88		start += LINESIZE;
89	}
90	local_irq_restore(flags);
91}
92
93void hexagon_inv_dcache_range(unsigned long start, unsigned long end)
94{
95	unsigned long lines = spanlines(start, end-1);
96	unsigned long i, flags;
97
98	start &= ~(LINESIZE - 1);
99
100	local_irq_save(flags);
101
102	for (i = 0; i < lines; i++) {
103		__asm__ __volatile__ (
104		"	dcinva(%0);	"
105		:
106		: "r" (start)
107		);
108		start += LINESIZE;
109	}
110	local_irq_restore(flags);
111}
112
113
114
115
116/*
117 * This is just really brutal and shouldn't be used anyways,
118 * especially on V2.  Left here just in case.
119 */
120void flush_cache_all_hexagon(void)
121{
122	unsigned long flags;
123	local_irq_save(flags);
124	__vmcache_ickill();
125	__vmcache_dckill();
126	__vmcache_l2kill();
127	local_irq_restore(flags);
128	mb();
129}
130
131void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
132		       unsigned long vaddr, void *dst, void *src, int len)
133{
134	memcpy(dst, src, len);
135	if (vma->vm_flags & VM_EXEC) {
136		flush_icache_range((unsigned long) dst,
137		(unsigned long) dst + len);
138	}
139}
140