Merge tag 'dm-pull9apr20' of git://git.denx.de/u-boot-dm
[oweals/u-boot.git] / arch / mips / lib / cache.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2003
4  * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
5  */
6
7 #include <common.h>
8 #include <cpu_func.h>
9 #include <asm/cacheops.h>
10 #ifdef CONFIG_MIPS_L2_CACHE
11 #include <asm/cm.h>
12 #endif
13 #include <asm/io.h>
14 #include <asm/mipsregs.h>
15 #include <asm/system.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 static void probe_l2(void)
20 {
21 #ifdef CONFIG_MIPS_L2_CACHE
22         unsigned long conf2, sl;
23         bool l2c = false;
24
25         if (!(read_c0_config1() & MIPS_CONF_M))
26                 return;
27
28         conf2 = read_c0_config2();
29
30         if (__mips_isa_rev >= 6) {
31                 l2c = conf2 & MIPS_CONF_M;
32                 if (l2c)
33                         l2c = read_c0_config3() & MIPS_CONF_M;
34                 if (l2c)
35                         l2c = read_c0_config4() & MIPS_CONF_M;
36                 if (l2c)
37                         l2c = read_c0_config5() & MIPS_CONF5_L2C;
38         }
39
40         if (l2c && config_enabled(CONFIG_MIPS_CM)) {
41                 gd->arch.l2_line_size = mips_cm_l2_line_size();
42         } else if (l2c) {
43                 /* We don't know how to retrieve L2 config on this system */
44                 BUG();
45         } else {
46                 sl = (conf2 & MIPS_CONF2_SL) >> MIPS_CONF2_SL_SHF;
47                 gd->arch.l2_line_size = sl ? (2 << sl) : 0;
48         }
49 #endif
50 }
51
52 void mips_cache_probe(void)
53 {
54 #ifdef CONFIG_SYS_CACHE_SIZE_AUTO
55         unsigned long conf1, il, dl;
56
57         conf1 = read_c0_config1();
58
59         il = (conf1 & MIPS_CONF1_IL) >> MIPS_CONF1_IL_SHF;
60         dl = (conf1 & MIPS_CONF1_DL) >> MIPS_CONF1_DL_SHF;
61
62         gd->arch.l1i_line_size = il ? (2 << il) : 0;
63         gd->arch.l1d_line_size = dl ? (2 << dl) : 0;
64 #endif
65         probe_l2();
66 }
67
68 static inline unsigned long icache_line_size(void)
69 {
70 #ifdef CONFIG_SYS_CACHE_SIZE_AUTO
71         return gd->arch.l1i_line_size;
72 #else
73         return CONFIG_SYS_ICACHE_LINE_SIZE;
74 #endif
75 }
76
77 static inline unsigned long dcache_line_size(void)
78 {
79 #ifdef CONFIG_SYS_CACHE_SIZE_AUTO
80         return gd->arch.l1d_line_size;
81 #else
82         return CONFIG_SYS_DCACHE_LINE_SIZE;
83 #endif
84 }
85
86 static inline unsigned long scache_line_size(void)
87 {
88 #ifdef CONFIG_MIPS_L2_CACHE
89         return gd->arch.l2_line_size;
90 #else
91         return CONFIG_SYS_SCACHE_LINE_SIZE;
92 #endif
93 }
94
95 #define cache_loop(start, end, lsize, ops...) do {                      \
96         const void *addr = (const void *)(start & ~(lsize - 1));        \
97         const void *aend = (const void *)((end - 1) & ~(lsize - 1));    \
98         const unsigned int cache_ops[] = { ops };                       \
99         unsigned int i;                                                 \
100                                                                         \
101         if (!lsize)                                                     \
102                 break;                                                  \
103                                                                         \
104         for (; addr <= aend; addr += lsize) {                           \
105                 for (i = 0; i < ARRAY_SIZE(cache_ops); i++)             \
106                         mips_cache(cache_ops[i], addr);                 \
107         }                                                               \
108 } while (0)
109
110 void flush_cache(ulong start_addr, ulong size)
111 {
112         unsigned long ilsize = icache_line_size();
113         unsigned long dlsize = dcache_line_size();
114         unsigned long slsize = scache_line_size();
115
116         /* aend will be miscalculated when size is zero, so we return here */
117         if (size == 0)
118                 return;
119
120         if ((ilsize == dlsize) && !slsize) {
121                 /* flush I-cache & D-cache simultaneously */
122                 cache_loop(start_addr, start_addr + size, ilsize,
123                            HIT_WRITEBACK_INV_D, HIT_INVALIDATE_I);
124                 goto ops_done;
125         }
126
127         /* flush D-cache */
128         cache_loop(start_addr, start_addr + size, dlsize, HIT_WRITEBACK_INV_D);
129
130         /* flush L2 cache */
131         cache_loop(start_addr, start_addr + size, slsize, HIT_WRITEBACK_INV_SD);
132
133         /* flush I-cache */
134         cache_loop(start_addr, start_addr + size, ilsize, HIT_INVALIDATE_I);
135
136 ops_done:
137         /* ensure cache ops complete before any further memory accesses */
138         sync();
139
140         /* ensure the pipeline doesn't contain now-invalid instructions */
141         instruction_hazard_barrier();
142 }
143
144 void __weak flush_dcache_range(ulong start_addr, ulong stop)
145 {
146         unsigned long lsize = dcache_line_size();
147         unsigned long slsize = scache_line_size();
148
149         /* aend will be miscalculated when size is zero, so we return here */
150         if (start_addr == stop)
151                 return;
152
153         cache_loop(start_addr, stop, lsize, HIT_WRITEBACK_INV_D);
154
155         /* flush L2 cache */
156         cache_loop(start_addr, stop, slsize, HIT_WRITEBACK_INV_SD);
157
158         /* ensure cache ops complete before any further memory accesses */
159         sync();
160 }
161
162 void invalidate_dcache_range(ulong start_addr, ulong stop)
163 {
164         unsigned long lsize = dcache_line_size();
165         unsigned long slsize = scache_line_size();
166
167         /* aend will be miscalculated when size is zero, so we return here */
168         if (start_addr == stop)
169                 return;
170
171         /* invalidate L2 cache */
172         cache_loop(start_addr, stop, slsize, HIT_INVALIDATE_SD);
173
174         cache_loop(start_addr, stop, lsize, HIT_INVALIDATE_D);
175
176         /* ensure cache ops complete before any further memory accesses */
177         sync();
178 }
179
180 int dcache_status(void)
181 {
182         unsigned int cca = read_c0_config() & CONF_CM_CMASK;
183         return cca != CONF_CM_UNCACHED;
184 }
185
186 void dcache_enable(void)
187 {
188         puts("Not supported!\n");
189 }
190
191 void dcache_disable(void)
192 {
193         /* change CCA to uncached */
194         change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
195
196         /* ensure the pipeline doesn't contain now-invalid instructions */
197         instruction_hazard_barrier();
198 }