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573a652f LB |
1 | /* |
2 | * arch/arm/mm/cache-tauros2.c - Tauros2 L2 cache controller support | |
3 | * | |
4 | * Copyright (C) 2008 Marvell Semiconductor | |
5 | * | |
6 | * This file is licensed under the terms of the GNU General Public | |
7 | * License version 2. This program is licensed "as is" without any | |
8 | * warranty of any kind, whether express or implied. | |
9 | * | |
10 | * References: | |
11 | * - PJ1 CPU Core Datasheet, | |
12 | * Document ID MV-S104837-01, Rev 0.7, January 24 2008. | |
13 | * - PJ4 CPU Core Datasheet, | |
14 | * Document ID MV-S105190-00, Rev 0.7, March 14 2008. | |
15 | */ | |
16 | ||
17 | #include <linux/init.h> | |
c2b7e05c CX |
18 | #include <linux/of.h> |
19 | #include <linux/of_address.h> | |
573a652f | 20 | #include <asm/cacheflush.h> |
15d07dc9 | 21 | #include <asm/cp15.h> |
fa79b8d6 | 22 | #include <asm/cputype.h> |
573a652f LB |
23 | #include <asm/hardware/cache-tauros2.h> |
24 | ||
25 | ||
26 | /* | |
27 | * When Tauros2 is used on a CPU that supports the v7 hierarchical | |
28 | * cache operations, the cache handling code in proc-v7.S takes care | |
29 | * of everything, including handling DMA coherency. | |
30 | * | |
31 | * So, we only need to register outer cache operations here if we're | |
32 | * being used on a pre-v7 CPU, and we only need to build support for | |
33 | * outer cache operations into the kernel image if the kernel has been | |
34 | * configured to support a pre-v7 CPU. | |
35 | */ | |
36 | #if __LINUX_ARM_ARCH__ < 7 | |
37 | /* | |
38 | * Low-level cache maintenance operations. | |
39 | */ | |
40 | static inline void tauros2_clean_pa(unsigned long addr) | |
41 | { | |
42 | __asm__("mcr p15, 1, %0, c7, c11, 3" : : "r" (addr)); | |
43 | } | |
44 | ||
45 | static inline void tauros2_clean_inv_pa(unsigned long addr) | |
46 | { | |
47 | __asm__("mcr p15, 1, %0, c7, c15, 3" : : "r" (addr)); | |
48 | } | |
49 | ||
50 | static inline void tauros2_inv_pa(unsigned long addr) | |
51 | { | |
52 | __asm__("mcr p15, 1, %0, c7, c7, 3" : : "r" (addr)); | |
53 | } | |
54 | ||
55 | ||
56 | /* | |
57 | * Linux primitives. | |
58 | * | |
59 | * Note that the end addresses passed to Linux primitives are | |
60 | * noninclusive. | |
61 | */ | |
62 | #define CACHE_LINE_SIZE 32 | |
63 | ||
64 | static void tauros2_inv_range(unsigned long start, unsigned long end) | |
65 | { | |
66 | /* | |
67 | * Clean and invalidate partial first cache line. | |
68 | */ | |
69 | if (start & (CACHE_LINE_SIZE - 1)) { | |
70 | tauros2_clean_inv_pa(start & ~(CACHE_LINE_SIZE - 1)); | |
71 | start = (start | (CACHE_LINE_SIZE - 1)) + 1; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Clean and invalidate partial last cache line. | |
76 | */ | |
77 | if (end & (CACHE_LINE_SIZE - 1)) { | |
78 | tauros2_clean_inv_pa(end & ~(CACHE_LINE_SIZE - 1)); | |
79 | end &= ~(CACHE_LINE_SIZE - 1); | |
80 | } | |
81 | ||
82 | /* | |
83 | * Invalidate all full cache lines between 'start' and 'end'. | |
84 | */ | |
85 | while (start < end) { | |
86 | tauros2_inv_pa(start); | |
87 | start += CACHE_LINE_SIZE; | |
88 | } | |
89 | ||
90 | dsb(); | |
91 | } | |
92 | ||
93 | static void tauros2_clean_range(unsigned long start, unsigned long end) | |
94 | { | |
95 | start &= ~(CACHE_LINE_SIZE - 1); | |
96 | while (start < end) { | |
97 | tauros2_clean_pa(start); | |
98 | start += CACHE_LINE_SIZE; | |
99 | } | |
100 | ||
101 | dsb(); | |
102 | } | |
103 | ||
104 | static void tauros2_flush_range(unsigned long start, unsigned long end) | |
105 | { | |
106 | start &= ~(CACHE_LINE_SIZE - 1); | |
107 | while (start < end) { | |
108 | tauros2_clean_inv_pa(start); | |
109 | start += CACHE_LINE_SIZE; | |
110 | } | |
111 | ||
112 | dsb(); | |
113 | } | |
89326f76 CX |
114 | |
115 | static void tauros2_disable(void) | |
116 | { | |
117 | __asm__ __volatile__ ( | |
118 | "mcr p15, 1, %0, c7, c11, 0 @L2 Cache Clean All\n\t" | |
119 | "mrc p15, 0, %0, c1, c0, 0\n\t" | |
120 | "bic %0, %0, #(1 << 26)\n\t" | |
121 | "mcr p15, 0, %0, c1, c0, 0 @Disable L2 Cache\n\t" | |
122 | : : "r" (0x0)); | |
123 | } | |
124 | ||
125 | static void tauros2_resume(void) | |
126 | { | |
127 | __asm__ __volatile__ ( | |
128 | "mcr p15, 1, %0, c7, c7, 0 @L2 Cache Invalidate All\n\t" | |
129 | "mrc p15, 0, %0, c1, c0, 0\n\t" | |
130 | "orr %0, %0, #(1 << 26)\n\t" | |
131 | "mcr p15, 0, %0, c1, c0, 0 @Enable L2 Cache\n\t" | |
132 | : : "r" (0x0)); | |
133 | } | |
573a652f LB |
134 | #endif |
135 | ||
136 | static inline u32 __init read_extra_features(void) | |
137 | { | |
138 | u32 u; | |
139 | ||
140 | __asm__("mrc p15, 1, %0, c15, c1, 0" : "=r" (u)); | |
141 | ||
142 | return u; | |
143 | } | |
144 | ||
145 | static inline void __init write_extra_features(u32 u) | |
146 | { | |
147 | __asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u)); | |
148 | } | |
149 | ||
573a652f LB |
150 | static inline int __init cpuid_scheme(void) |
151 | { | |
573a652f LB |
152 | return !!((processor_id & 0x000f0000) == 0x000f0000); |
153 | } | |
154 | ||
155 | static inline u32 __init read_mmfr3(void) | |
156 | { | |
157 | u32 mmfr3; | |
158 | ||
159 | __asm__("mrc p15, 0, %0, c0, c1, 7\n" : "=r" (mmfr3)); | |
160 | ||
161 | return mmfr3; | |
162 | } | |
163 | ||
164 | static inline u32 __init read_actlr(void) | |
165 | { | |
166 | u32 actlr; | |
167 | ||
168 | __asm__("mrc p15, 0, %0, c1, c0, 1\n" : "=r" (actlr)); | |
169 | ||
170 | return actlr; | |
171 | } | |
172 | ||
173 | static inline void __init write_actlr(u32 actlr) | |
174 | { | |
175 | __asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr)); | |
176 | } | |
177 | ||
38f2e377 CX |
178 | static void enable_extra_feature(unsigned int features) |
179 | { | |
180 | u32 u; | |
181 | ||
182 | u = read_extra_features(); | |
183 | ||
184 | if (features & CACHE_TAUROS2_PREFETCH_ON) | |
185 | u &= ~0x01000000; | |
186 | else | |
187 | u |= 0x01000000; | |
188 | printk(KERN_INFO "Tauros2: %s L2 prefetch.\n", | |
189 | (features & CACHE_TAUROS2_PREFETCH_ON) | |
190 | ? "Enabling" : "Disabling"); | |
191 | ||
192 | if (features & CACHE_TAUROS2_LINEFILL_BURST8) | |
193 | u |= 0x00100000; | |
194 | else | |
195 | u &= ~0x00100000; | |
196 | printk(KERN_INFO "Tauros2: %s line fill burt8.\n", | |
197 | (features & CACHE_TAUROS2_LINEFILL_BURST8) | |
198 | ? "Enabling" : "Disabling"); | |
199 | ||
200 | write_extra_features(u); | |
201 | } | |
202 | ||
c2b7e05c | 203 | static void __init tauros2_internal_init(unsigned int features) |
573a652f | 204 | { |
5967b546 | 205 | char *mode = NULL; |
573a652f | 206 | |
38f2e377 | 207 | enable_extra_feature(features); |
573a652f LB |
208 | |
209 | #ifdef CONFIG_CPU_32v5 | |
210 | if ((processor_id & 0xff0f0000) == 0x56050000) { | |
211 | u32 feat; | |
212 | ||
213 | /* | |
214 | * v5 CPUs with Tauros2 have the L2 cache enable bit | |
215 | * located in the CPU Extra Features register. | |
216 | */ | |
217 | feat = read_extra_features(); | |
218 | if (!(feat & 0x00400000)) { | |
219 | printk(KERN_INFO "Tauros2: Enabling L2 cache.\n"); | |
220 | write_extra_features(feat | 0x00400000); | |
221 | } | |
222 | ||
223 | mode = "ARMv5"; | |
224 | outer_cache.inv_range = tauros2_inv_range; | |
225 | outer_cache.clean_range = tauros2_clean_range; | |
226 | outer_cache.flush_range = tauros2_flush_range; | |
89326f76 CX |
227 | outer_cache.disable = tauros2_disable; |
228 | outer_cache.resume = tauros2_resume; | |
573a652f LB |
229 | } |
230 | #endif | |
231 | ||
232 | #ifdef CONFIG_CPU_32v6 | |
233 | /* | |
234 | * Check whether this CPU lacks support for the v7 hierarchical | |
235 | * cache ops. (PJ4 is in its v6 personality mode if the MMFR3 | |
236 | * register indicates no support for the v7 hierarchical cache | |
237 | * ops.) | |
238 | */ | |
239 | if (cpuid_scheme() && (read_mmfr3() & 0xf) == 0) { | |
240 | /* | |
241 | * When Tauros2 is used in an ARMv6 system, the L2 | |
242 | * enable bit is in the ARMv6 ARM-mandated position | |
243 | * (bit [26] of the System Control Register). | |
244 | */ | |
245 | if (!(get_cr() & 0x04000000)) { | |
246 | printk(KERN_INFO "Tauros2: Enabling L2 cache.\n"); | |
247 | adjust_cr(0x04000000, 0x04000000); | |
248 | } | |
249 | ||
250 | mode = "ARMv6"; | |
251 | outer_cache.inv_range = tauros2_inv_range; | |
252 | outer_cache.clean_range = tauros2_clean_range; | |
253 | outer_cache.flush_range = tauros2_flush_range; | |
89326f76 CX |
254 | outer_cache.disable = tauros2_disable; |
255 | outer_cache.resume = tauros2_resume; | |
573a652f LB |
256 | } |
257 | #endif | |
258 | ||
259 | #ifdef CONFIG_CPU_32v7 | |
260 | /* | |
261 | * Check whether this CPU has support for the v7 hierarchical | |
262 | * cache ops. (PJ4 is in its v7 personality mode if the MMFR3 | |
263 | * register indicates support for the v7 hierarchical cache | |
264 | * ops.) | |
265 | * | |
266 | * (Although strictly speaking there may exist CPUs that | |
267 | * implement the v7 cache ops but are only ARMv6 CPUs (due to | |
268 | * not complying with all of the other ARMv7 requirements), | |
269 | * there are no real-life examples of Tauros2 being used on | |
270 | * such CPUs as of yet.) | |
271 | */ | |
272 | if (cpuid_scheme() && (read_mmfr3() & 0xf) == 1) { | |
273 | u32 actlr; | |
274 | ||
275 | /* | |
276 | * When Tauros2 is used in an ARMv7 system, the L2 | |
277 | * enable bit is located in the Auxiliary System Control | |
278 | * Register (which is the only register allowed by the | |
279 | * ARMv7 spec to contain fine-grained cache control bits). | |
280 | */ | |
281 | actlr = read_actlr(); | |
282 | if (!(actlr & 0x00000002)) { | |
283 | printk(KERN_INFO "Tauros2: Enabling L2 cache.\n"); | |
284 | write_actlr(actlr | 0x00000002); | |
285 | } | |
286 | ||
287 | mode = "ARMv7"; | |
288 | } | |
289 | #endif | |
290 | ||
291 | if (mode == NULL) { | |
292 | printk(KERN_CRIT "Tauros2: Unable to detect CPU mode.\n"); | |
293 | return; | |
294 | } | |
295 | ||
296 | printk(KERN_INFO "Tauros2: L2 cache support initialised " | |
297 | "in %s mode.\n", mode); | |
298 | } | |
c2b7e05c CX |
299 | |
300 | #ifdef CONFIG_OF | |
301 | static const struct of_device_id tauros2_ids[] __initconst = { | |
302 | { .compatible = "marvell,tauros2-cache"}, | |
303 | {} | |
304 | }; | |
305 | #endif | |
306 | ||
307 | void __init tauros2_init(unsigned int features) | |
308 | { | |
309 | #ifdef CONFIG_OF | |
310 | struct device_node *node; | |
311 | int ret; | |
312 | unsigned int f; | |
313 | ||
314 | node = of_find_matching_node(NULL, tauros2_ids); | |
315 | if (!node) { | |
316 | pr_info("Not found marvell,tauros2-cache, disable it\n"); | |
317 | return; | |
318 | } | |
319 | ||
320 | ret = of_property_read_u32(node, "marvell,tauros2-cache-features", &f); | |
321 | if (ret) { | |
322 | pr_info("Not found marvell,tauros-cache-features property, " | |
323 | "disable extra features\n"); | |
324 | features = 0; | |
325 | } else | |
326 | features = f; | |
327 | #endif | |
328 | tauros2_internal_init(features); | |
329 | } |