1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/arm/mm/cache-xsc3l2.c - XScale3 L2 cache controller support
4 *
5 * Copyright (C) 2007 ARM Limited
6 */
7 #include <linux/init.h>
8 #include <linux/highmem.h>
9 #include <asm/cp15.h>
10 #include <asm/cputype.h>
11 #include <asm/cacheflush.h>
12
13 #define CR_L2 (1 << 26)
14
15 #define CACHE_LINE_SIZE 32
16 #define CACHE_LINE_SHIFT 5
17 #define CACHE_WAY_PER_SET 8
18
19 #define CACHE_WAY_SIZE(l2ctype) (8192 << (((l2ctype) >> 8) & 0xf))
20 #define CACHE_SET_SIZE(l2ctype) (CACHE_WAY_SIZE(l2ctype) >> CACHE_LINE_SHIFT)
21
22 static inline int xsc3_l2_present(void)
23 {
24 unsigned long l2ctype;
25
26 __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
27
28 return !!(l2ctype & 0xf8);
29 }
30
31 static inline void xsc3_l2_clean_mva(unsigned long addr)
32 {
33 __asm__("mcr p15, 1, %0, c7, c11, 1" : : "r" (addr));
34 }
35
36 static inline void xsc3_l2_inv_mva(unsigned long addr)
37 {
38 __asm__("mcr p15, 1, %0, c7, c7, 1" : : "r" (addr));
39 }
40
41 static inline void xsc3_l2_inv_all(void)
42 {
43 unsigned long l2ctype, set_way;
44 int set, way;
45
46 __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
47
48 for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
49 for (way = 0; way < CACHE_WAY_PER_SET; way++) {
50 set_way = (way << 29) | (set << 5);
51 __asm__("mcr p15, 1, %0, c7, c11, 2" : : "r"(set_way));
52 }
53 }
54
55 dsb();
56 }
57
58 static inline void l2_unmap_va(unsigned long va)
59 {
60 #ifdef CONFIG_HIGHMEM
61 if (va != -1)
62 kunmap_atomic((void *)va);
63 #endif
64 }
65
66 static inline unsigned long l2_map_va(unsigned long pa, unsigned long prev_va)
67 {
68 #ifdef CONFIG_HIGHMEM
69 unsigned long va = prev_va & PAGE_MASK;
70 unsigned long pa_offset = pa << (32 - PAGE_SHIFT);
71 if (unlikely(pa_offset < (prev_va << (32 - PAGE_SHIFT)))) {
72 /*
73 * Switching to a new page. Because cache ops are
74 * using virtual addresses only, we must put a mapping
75 * in place for it.
76 */
77 l2_unmap_va(prev_va);
78 va = (unsigned long)kmap_atomic_pfn(pa >> PAGE_SHIFT);
79 }
80 return va + (pa_offset >> (32 - PAGE_SHIFT));
81 #else
82 return __phys_to_virt(pa);
83 #endif
84 }
85
86 static void xsc3_l2_inv_range(unsigned long start, unsigned long end)
87 {
88 unsigned long vaddr;
89
90 if (start == 0 && end == -1ul) {
91 xsc3_l2_inv_all();
92 return;
93 }
94
95 vaddr = -1; /* to force the first mapping */
96
97 /*
98 * Clean and invalidate partial first cache line.
99 */
100 if (start & (CACHE_LINE_SIZE - 1)) {
101 vaddr = l2_map_va(start & ~(CACHE_LINE_SIZE - 1), vaddr);
102 xsc3_l2_clean_mva(vaddr);
103 xsc3_l2_inv_mva(vaddr);
104 start = (start | (CACHE_LINE_SIZE - 1)) + 1;
105 }
106
107 /*
108 * Invalidate all full cache lines between 'start' and 'end'.
109 */
110 while (start < (end & ~(CACHE_LINE_SIZE - 1))) {
111 vaddr = l2_map_va(start, vaddr);
112 xsc3_l2_inv_mva(vaddr);
113 start += CACHE_LINE_SIZE;
114 }
115
116 /*
117 * Clean and invalidate partial last cache line.
118 */
119 if (start < end) {
120 vaddr = l2_map_va(start, vaddr);
121 xsc3_l2_clean_mva(vaddr);
122 xsc3_l2_inv_mva(vaddr);
123 }
124
125 l2_unmap_va(vaddr);
126
127 dsb();
128 }
129
130 static void xsc3_l2_clean_range(unsigned long start, unsigned long end)
131 {
132 unsigned long vaddr;
133
134 vaddr = -1; /* to force the first mapping */
135
136 start &= ~(CACHE_LINE_SIZE - 1);
137 while (start < end) {
138 vaddr = l2_map_va(start, vaddr);
139 xsc3_l2_clean_mva(vaddr);
140 start += CACHE_LINE_SIZE;
141 }
142
143 l2_unmap_va(vaddr);
144
145 dsb();
146 }
147
148 /*
149 * optimize L2 flush all operation by set/way format
150 */
151 static inline void xsc3_l2_flush_all(void)
152 {
153 unsigned long l2ctype, set_way;
154 int set, way;
155
156 __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
157
158 for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
159 for (way = 0; way < CACHE_WAY_PER_SET; way++) {
160 set_way = (way << 29) | (set << 5);
161 __asm__("mcr p15, 1, %0, c7, c15, 2" : : "r"(set_way));
162 }
163 }
164
165 dsb();
166 }
167
168 static void xsc3_l2_flush_range(unsigned long start, unsigned long end)
169 {
170 unsigned long vaddr;
171
172 if (start == 0 && end == -1ul) {
173 xsc3_l2_flush_all();
174 return;
175 }
176
177 vaddr = -1; /* to force the first mapping */
178
179 start &= ~(CACHE_LINE_SIZE - 1);
180 while (start < end) {
181 vaddr = l2_map_va(start, vaddr);
182 xsc3_l2_clean_mva(vaddr);
183 xsc3_l2_inv_mva(vaddr);
184 start += CACHE_LINE_SIZE;
185 }
186
187 l2_unmap_va(vaddr);
188
189 dsb();
190 }
191
192 static int __init xsc3_l2_init(void)
193 {
194 if (!cpu_is_xsc3() || !xsc3_l2_present())
195 return 0;
196
197 if (get_cr() & CR_L2) {
198 pr_info("XScale3 L2 cache enabled.\n");
199 xsc3_l2_inv_all();
200
201 outer_cache.inv_range = xsc3_l2_inv_range;
202 outer_cache.clean_range = xsc3_l2_clean_range;
203 outer_cache.flush_range = xsc3_l2_flush_range;
204 }
205
206 return 0;
207 }
208 core_initcall(xsc3_l2_init);
209
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