2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
4 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm/arcregs.h>
11 /* Bit values in IC_CTRL */
12 #define IC_CTRL_CACHE_DISABLE (1 << 0)
14 /* Bit values in DC_CTRL */
15 #define DC_CTRL_CACHE_DISABLE (1 << 0)
16 #define DC_CTRL_INV_MODE_FLUSH (1 << 6)
17 #define DC_CTRL_FLUSH_STATUS (1 << 8)
18 #define CACHE_VER_NUM_MASK 0xF
20 int icache_status(void)
22 /* If no cache in CPU exit immediately */
23 if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK))
26 return (read_aux_reg(ARC_AUX_IC_CTRL) & IC_CTRL_CACHE_DISABLE) !=
27 IC_CTRL_CACHE_DISABLE;
30 void icache_enable(void)
32 /* If no cache in CPU exit immediately */
33 if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK))
36 write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) &
37 ~IC_CTRL_CACHE_DISABLE);
40 void icache_disable(void)
42 /* If no cache in CPU exit immediately */
43 if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK))
46 write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) |
47 IC_CTRL_CACHE_DISABLE);
50 void invalidate_icache_all(void)
52 /* If no cache in CPU exit immediately */
53 if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK))
56 /* Any write to IC_IVIC register triggers invalidation of entire I$ */
57 write_aux_reg(ARC_AUX_IC_IVIC, 1);
60 int dcache_status(void)
62 /* If no cache in CPU exit immediately */
63 if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
66 return (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_CACHE_DISABLE) !=
67 DC_CTRL_CACHE_DISABLE;
70 void dcache_enable(void)
72 /* If no cache in CPU exit immediately */
73 if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
76 write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) &
77 ~(DC_CTRL_INV_MODE_FLUSH | DC_CTRL_CACHE_DISABLE));
80 void dcache_disable(void)
82 /* If no cache in CPU exit immediately */
83 if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
86 write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) |
87 DC_CTRL_CACHE_DISABLE);
90 void flush_dcache_all(void)
92 /* If no cache in CPU exit immediately */
93 if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
96 /* Do flush of entire cache */
97 write_aux_reg(ARC_AUX_DC_FLSH, 1);
100 while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS)
104 #ifndef CONFIG_SYS_DCACHE_OFF
105 static void dcache_flush_line(unsigned addr)
107 #if (CONFIG_ARC_MMU_VER == 3)
108 write_aux_reg(ARC_AUX_DC_PTAG, addr);
110 write_aux_reg(ARC_AUX_DC_FLDL, addr);
113 while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS)
116 #ifndef CONFIG_SYS_ICACHE_OFF
118 * Invalidate I$ for addresses range just flushed from D$.
119 * If we try to execute data flushed above it will be valid/correct
121 #if (CONFIG_ARC_MMU_VER == 3)
122 write_aux_reg(ARC_AUX_IC_PTAG, addr);
124 write_aux_reg(ARC_AUX_IC_IVIL, addr);
125 #endif /* CONFIG_SYS_ICACHE_OFF */
127 #endif /* CONFIG_SYS_DCACHE_OFF */
129 void flush_dcache_range(unsigned long start, unsigned long end)
131 #ifndef CONFIG_SYS_DCACHE_OFF
134 start = start & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
135 end = end & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
137 for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE)
138 dcache_flush_line(addr);
139 #endif /* CONFIG_SYS_DCACHE_OFF */
142 void invalidate_dcache_range(unsigned long start, unsigned long end)
144 #ifndef CONFIG_SYS_DCACHE_OFF
147 start = start & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
148 end = end & (~(CONFIG_SYS_CACHELINE_SIZE - 1));
150 for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) {
151 #if (CONFIG_ARC_MMU_VER == 3)
152 write_aux_reg(ARC_AUX_DC_PTAG, addr);
154 write_aux_reg(ARC_AUX_DC_IVDL, addr);
156 #endif /* CONFIG_SYS_DCACHE_OFF */
159 void invalidate_dcache_all(void)
161 /* If no cache in CPU exit immediately */
162 if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK))
165 /* Write 1 to DC_IVDC register triggers invalidation of entire D$ */
166 write_aux_reg(ARC_AUX_DC_IVDC, 1);
169 void flush_cache(unsigned long start, unsigned long size)
171 flush_dcache_range(start, start + size);