Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sh/mm/cache-sh2a.c
10817 views
1
/*

2
 * arch/sh/mm/cache-sh2a.c

3
 *

4
 * Copyright (C) 2008 Yoshinori Sato

5
 *

6
 * Released under the terms of the GNU GPL v2.0.

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 sh2a__flush_wback_region(void *start, int size)

19
{

20
	unsigned long v;

21
	unsigned long begin, end;

22
	unsigned long flags;

23


24
	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);

25
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)

26
		& ~(L1_CACHE_BYTES-1);

27


28
	local_irq_save(flags);

29
	jump_to_uncached();

30


31
	for (v = begin; v < end; v+=L1_CACHE_BYTES) {

32
		unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0);

33
		int way;

34
		for (way = 0; way < 4; way++) {

35
			unsigned long data =  __raw_readl(addr | (way << 11));

36
			if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {

37
				data &= ~SH_CACHE_UPDATED;

38
				__raw_writel(data, addr | (way << 11));

39
			}

40
		}

41
	}

42


43
	back_to_cached();

44
	local_irq_restore(flags);

45
}

46


47
static void sh2a__flush_purge_region(void *start, int size)

48
{

49
	unsigned long v;

50
	unsigned long begin, end;

51
	unsigned long flags;

52


53
	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);

54
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)

55
		& ~(L1_CACHE_BYTES-1);

56


57
	local_irq_save(flags);

58
	jump_to_uncached();

59


60
	for (v = begin; v < end; v+=L1_CACHE_BYTES) {

61
		__raw_writel((v & CACHE_PHYSADDR_MASK),

62
			  CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);

63
	}

64
	back_to_cached();

65
	local_irq_restore(flags);

66
}

67


68
static void sh2a__flush_invalidate_region(void *start, int size)

69
{

70
	unsigned long v;

71
	unsigned long begin, end;

72
	unsigned long flags;

73


74
	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);

75
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)

76
		& ~(L1_CACHE_BYTES-1);

77
	local_irq_save(flags);

78
	jump_to_uncached();

79


80
#ifdef CONFIG_CACHE_WRITEBACK

81
	__raw_writel(__raw_readl(CCR) | CCR_OCACHE_INVALIDATE, CCR);

82
	/* I-cache invalidate */

83
	for (v = begin; v < end; v+=L1_CACHE_BYTES) {

84
		__raw_writel((v & CACHE_PHYSADDR_MASK),

85
			  CACHE_IC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);

86
	}

87
#else

88
	for (v = begin; v < end; v+=L1_CACHE_BYTES) {

89
		__raw_writel((v & CACHE_PHYSADDR_MASK),

90
			  CACHE_IC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);

91
		__raw_writel((v & CACHE_PHYSADDR_MASK),

92
			  CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);

93
	}

94
#endif

95
	back_to_cached();

96
	local_irq_restore(flags);

97
}

98


99
/* WBack O-Cache and flush I-Cache */

100
static void sh2a_flush_icache_range(void *args)

101
{

102
	struct flusher_data *data = args;

103
	unsigned long start, end;

104
	unsigned long v;

105
	unsigned long flags;

106


107
	start = data->addr1 & ~(L1_CACHE_BYTES-1);

108
	end = (data->addr2 + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);

109


110
	local_irq_save(flags);

111
	jump_to_uncached();

112


113
	for (v = start; v < end; v+=L1_CACHE_BYTES) {

114
		unsigned long addr = (v & 0x000007f0);

115
		int way;

116
		/* O-Cache writeback */

117
		for (way = 0; way < 4; way++) {

118
			unsigned long data =  __raw_readl(CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));

119
			if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {

120
				data &= ~SH_CACHE_UPDATED;

121
				__raw_writel(data, CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));

122
			}

123
		}

124
		/* I-Cache invalidate */

125
		__raw_writel(addr,

126
			  CACHE_IC_ADDRESS_ARRAY | addr | 0x00000008);

127
	}

128


129
	back_to_cached();

130
	local_irq_restore(flags);

131
}

132


133
void __init sh2a_cache_init(void)

134
{

135
	local_flush_icache_range	= sh2a_flush_icache_range;

136


137
	__flush_wback_region		= sh2a__flush_wback_region;

138
	__flush_purge_region		= sh2a__flush_purge_region;

139
	__flush_invalidate_region	= sh2a__flush_invalidate_region;

140
}

141


142