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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/arm/mm/cache-tauros2.c - Tauros2 L2 cache controller support
4 *
5 * Copyright (C) 2008 Marvell Semiconductor
6 *
7 * References:
8 * - PJ1 CPU Core Datasheet,
9 * Document ID MV-S104837-01, Rev 0.7, January 24 2008.
10 * - PJ4 CPU Core Datasheet,
11 * Document ID MV-S105190-00, Rev 0.7, March 14 2008.
12 */
13
14#include <linux/init.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <asm/cacheflush.h>
18#include <asm/cp15.h>
19#include <asm/cputype.h>
20#include <asm/hardware/cache-tauros2.h>
21
22/* CP15 PJ4 Control configuration register */
23#define CCR_L2C_PREFETCH_DISABLE BIT(24)
24#define CCR_L2C_ECC_ENABLE BIT(23)
25#define CCR_L2C_WAY7_4_DISABLE BIT(21)
26#define CCR_L2C_BURST8_ENABLE BIT(20)
27
28/*
29 * When Tauros2 is used on a CPU that supports the v7 hierarchical
30 * cache operations, the cache handling code in proc-v7.S takes care
31 * of everything, including handling DMA coherency.
32 *
33 * So, we only need to register outer cache operations here if we're
34 * being used on a pre-v7 CPU, and we only need to build support for
35 * outer cache operations into the kernel image if the kernel has been
36 * configured to support a pre-v7 CPU.
37 */
38#ifdef CONFIG_CPU_32v5
39/*
40 * Low-level cache maintenance operations.
41 */
42static inline void tauros2_clean_pa(unsigned long addr)
43{
44 __asm__("mcr p15, 1, %0, c7, c11, 3" : : "r" (addr));
45}
46
47static inline void tauros2_clean_inv_pa(unsigned long addr)
48{
49 __asm__("mcr p15, 1, %0, c7, c15, 3" : : "r" (addr));
50}
51
52static inline void tauros2_inv_pa(unsigned long addr)
53{
54 __asm__("mcr p15, 1, %0, c7, c7, 3" : : "r" (addr));
55}
56
57
58/*
59 * Linux primitives.
60 *
61 * Note that the end addresses passed to Linux primitives are
62 * noninclusive.
63 */
64#define CACHE_LINE_SIZE 32
65
66static void tauros2_inv_range(unsigned long start, unsigned long end)
67{
68 /*
69 * Clean and invalidate partial first cache line.
70 */
71 if (start & (CACHE_LINE_SIZE - 1)) {
72 tauros2_clean_inv_pa(start & ~(CACHE_LINE_SIZE - 1));
73 start = (start | (CACHE_LINE_SIZE - 1)) + 1;
74 }
75
76 /*
77 * Clean and invalidate partial last cache line.
78 */
79 if (end & (CACHE_LINE_SIZE - 1)) {
80 tauros2_clean_inv_pa(end & ~(CACHE_LINE_SIZE - 1));
81 end &= ~(CACHE_LINE_SIZE - 1);
82 }
83
84 /*
85 * Invalidate all full cache lines between 'start' and 'end'.
86 */
87 while (start < end) {
88 tauros2_inv_pa(start);
89 start += CACHE_LINE_SIZE;
90 }
91
92 dsb();
93}
94
95static void tauros2_clean_range(unsigned long start, unsigned long end)
96{
97 start &= ~(CACHE_LINE_SIZE - 1);
98 while (start < end) {
99 tauros2_clean_pa(start);
100 start += CACHE_LINE_SIZE;
101 }
102
103 dsb();
104}
105
106static void tauros2_flush_range(unsigned long start, unsigned long end)
107{
108 start &= ~(CACHE_LINE_SIZE - 1);
109 while (start < end) {
110 tauros2_clean_inv_pa(start);
111 start += CACHE_LINE_SIZE;
112 }
113
114 dsb();
115}
116
117static void tauros2_disable(void)
118{
119 __asm__ __volatile__ (
120 "mcr p15, 1, %0, c7, c11, 0 @L2 Cache Clean All\n\t"
121 "mrc p15, 0, %0, c1, c0, 0\n\t"
122 "bic %0, %0, #(1 << 26)\n\t"
123 "mcr p15, 0, %0, c1, c0, 0 @Disable L2 Cache\n\t"
124 : : "r" (0x0));
125}
126
127static void tauros2_resume(void)
128{
129 __asm__ __volatile__ (
130 "mcr p15, 1, %0, c7, c7, 0 @L2 Cache Invalidate All\n\t"
131 "mrc p15, 0, %0, c1, c0, 0\n\t"
132 "orr %0, %0, #(1 << 26)\n\t"
133 "mcr p15, 0, %0, c1, c0, 0 @Enable L2 Cache\n\t"
134 : : "r" (0x0));
135}
136#endif
137
138static inline u32 __init read_extra_features(void)
139{
140 u32 u;
141
142 __asm__("mrc p15, 1, %0, c15, c1, 0" : "=r" (u));
143
144 return u;
145}
146
147static inline void __init write_extra_features(u32 u)
148{
149 __asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
150}
151
152static inline int __init cpuid_scheme(void)
153{
154 return !!((processor_id & 0x000f0000) == 0x000f0000);
155}
156
157static inline u32 __init read_mmfr3(void)
158{
159 u32 mmfr3;
160
161 __asm__("mrc p15, 0, %0, c0, c1, 7\n" : "=r" (mmfr3));
162
163 return mmfr3;
164}
165
166static inline u32 __init read_actlr(void)
167{
168 u32 actlr;
169
170 __asm__("mrc p15, 0, %0, c1, c0, 1\n" : "=r" (actlr));
171
172 return actlr;
173}
174
175static inline void __init write_actlr(u32 actlr)
176{
177 __asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr));
178}
179
180static void enable_extra_feature(unsigned int features)
181{
182 u32 u;
183
184 u = read_extra_features();
185
186 if (features & CACHE_TAUROS2_PREFETCH_ON)
187 u &= ~CCR_L2C_PREFETCH_DISABLE;
188 else
189 u |= CCR_L2C_PREFETCH_DISABLE;
190 pr_info("Tauros2: %s L2 prefetch.\n",
191 (features & CACHE_TAUROS2_PREFETCH_ON)
192 ? "Enabling" : "Disabling");
193
194 if (features & CACHE_TAUROS2_LINEFILL_BURST8)
195 u |= CCR_L2C_BURST8_ENABLE;
196 else
197 u &= ~CCR_L2C_BURST8_ENABLE;
198 pr_info("Tauros2: %s burst8 line fill.\n",
199 (features & CACHE_TAUROS2_LINEFILL_BURST8)
200 ? "Enabling" : "Disabling");
201
202 write_extra_features(u);
203}
204
205static void __init tauros2_internal_init(unsigned int features)
206{
207 char *mode = NULL;
208
209 enable_extra_feature(features);
210
211#ifdef CONFIG_CPU_32v5
212 if ((processor_id & 0xff0f0000) == 0x56050000) {
213 u32 feat;
214
215 /*
216 * v5 CPUs with Tauros2 have the L2 cache enable bit
217 * located in the CPU Extra Features register.
218 */
219 feat = read_extra_features();
220 if (!(feat & 0x00400000)) {
221 pr_info("Tauros2: Enabling L2 cache.\n");
222 write_extra_features(feat | 0x00400000);
223 }
224
225 mode = "ARMv5";
226 outer_cache.inv_range = tauros2_inv_range;
227 outer_cache.clean_range = tauros2_clean_range;
228 outer_cache.flush_range = tauros2_flush_range;
229 outer_cache.disable = tauros2_disable;
230 outer_cache.resume = tauros2_resume;
231 }
232#endif
233
234#ifdef CONFIG_CPU_32v7
235 /*
236 * Check whether this CPU has support for the v7 hierarchical
237 * cache ops. (PJ4 is in its v7 personality mode if the MMFR3
238 * register indicates support for the v7 hierarchical cache
239 * ops.)
240 *
241 * (Although strictly speaking there may exist CPUs that
242 * implement the v7 cache ops but are only ARMv6 CPUs (due to
243 * not complying with all of the other ARMv7 requirements),
244 * there are no real-life examples of Tauros2 being used on
245 * such CPUs as of yet.)
246 */
247 if (cpuid_scheme() && (read_mmfr3() & 0xf) == 1) {
248 u32 actlr;
249
250 /*
251 * When Tauros2 is used in an ARMv7 system, the L2
252 * enable bit is located in the Auxiliary System Control
253 * Register (which is the only register allowed by the
254 * ARMv7 spec to contain fine-grained cache control bits).
255 */
256 actlr = read_actlr();
257 if (!(actlr & 0x00000002)) {
258 pr_info("Tauros2: Enabling L2 cache.\n");
259 write_actlr(actlr | 0x00000002);
260 }
261
262 mode = "ARMv7";
263 }
264#endif
265
266 if (mode == NULL) {
267 pr_crit("Tauros2: Unable to detect CPU mode.\n");
268 return;
269 }
270
271 pr_info("Tauros2: L2 cache support initialised "
272 "in %s mode.\n", mode);
273}
274
275#ifdef CONFIG_OF
276static const struct of_device_id tauros2_ids[] __initconst = {
277 { .compatible = "marvell,tauros2-cache"},
278 {}
279};
280#endif
281
282void __init tauros2_init(unsigned int features)
283{
284#ifdef CONFIG_OF
285 struct device_node *node;
286 int ret;
287 unsigned int f;
288
289 node = of_find_matching_node(NULL, tauros2_ids);
290 if (!node) {
291 pr_info("Not found marvell,tauros2-cache, disable it\n");
292 } else {
293 ret = of_property_read_u32(node, "marvell,tauros2-cache-features", &f);
294 if (ret) {
295 pr_info("Not found marvell,tauros-cache-features property, "
296 "disable extra features\n");
297 features = 0;
298 } else
299 features = f;
300 }
301#endif
302 tauros2_internal_init(features);
303}
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>
18#include <linux/of.h>
19#include <linux/of_address.h>
20#include <asm/cacheflush.h>
21#include <asm/cp15.h>
22#include <asm/cputype.h>
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#ifdef CONFIG_CPU_32v5
37/*
38 * Low-level cache maintenance operations.
39 */
40static inline void tauros2_clean_pa(unsigned long addr)
41{
42 __asm__("mcr p15, 1, %0, c7, c11, 3" : : "r" (addr));
43}
44
45static inline void tauros2_clean_inv_pa(unsigned long addr)
46{
47 __asm__("mcr p15, 1, %0, c7, c15, 3" : : "r" (addr));
48}
49
50static 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
64static 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
93static 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
104static 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}
114
115static 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
125static 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}
134#endif
135
136static 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
145static inline void __init write_extra_features(u32 u)
146{
147 __asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
148}
149
150static inline int __init cpuid_scheme(void)
151{
152 return !!((processor_id & 0x000f0000) == 0x000f0000);
153}
154
155static 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
164static 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
173static inline void __init write_actlr(u32 actlr)
174{
175 __asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr));
176}
177
178static 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
203static void __init tauros2_internal_init(unsigned int features)
204{
205 char *mode = NULL;
206
207 enable_extra_feature(features);
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;
227 outer_cache.disable = tauros2_disable;
228 outer_cache.resume = tauros2_resume;
229 }
230#endif
231
232#ifdef CONFIG_CPU_32v7
233 /*
234 * Check whether this CPU has support for the v7 hierarchical
235 * cache ops. (PJ4 is in its v7 personality mode if the MMFR3
236 * register indicates support for the v7 hierarchical cache
237 * ops.)
238 *
239 * (Although strictly speaking there may exist CPUs that
240 * implement the v7 cache ops but are only ARMv6 CPUs (due to
241 * not complying with all of the other ARMv7 requirements),
242 * there are no real-life examples of Tauros2 being used on
243 * such CPUs as of yet.)
244 */
245 if (cpuid_scheme() && (read_mmfr3() & 0xf) == 1) {
246 u32 actlr;
247
248 /*
249 * When Tauros2 is used in an ARMv7 system, the L2
250 * enable bit is located in the Auxiliary System Control
251 * Register (which is the only register allowed by the
252 * ARMv7 spec to contain fine-grained cache control bits).
253 */
254 actlr = read_actlr();
255 if (!(actlr & 0x00000002)) {
256 printk(KERN_INFO "Tauros2: Enabling L2 cache.\n");
257 write_actlr(actlr | 0x00000002);
258 }
259
260 mode = "ARMv7";
261 }
262#endif
263
264 if (mode == NULL) {
265 printk(KERN_CRIT "Tauros2: Unable to detect CPU mode.\n");
266 return;
267 }
268
269 printk(KERN_INFO "Tauros2: L2 cache support initialised "
270 "in %s mode.\n", mode);
271}
272
273#ifdef CONFIG_OF
274static const struct of_device_id tauros2_ids[] __initconst = {
275 { .compatible = "marvell,tauros2-cache"},
276 {}
277};
278#endif
279
280void __init tauros2_init(unsigned int features)
281{
282#ifdef CONFIG_OF
283 struct device_node *node;
284 int ret;
285 unsigned int f;
286
287 node = of_find_matching_node(NULL, tauros2_ids);
288 if (!node) {
289 pr_info("Not found marvell,tauros2-cache, disable it\n");
290 return;
291 }
292
293 ret = of_property_read_u32(node, "marvell,tauros2-cache-features", &f);
294 if (ret) {
295 pr_info("Not found marvell,tauros-cache-features property, "
296 "disable extra features\n");
297 features = 0;
298 } else
299 features = f;
300#endif
301 tauros2_internal_init(features);
302}