]>
Commit | Line | Data |
---|---|---|
2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
9f98f3dd PB |
2 | /* |
3 | * Copyright (C) 2013 Imagination Technologies | |
48c834be | 4 | * Author: Paul Burton <paul.burton@mips.com> |
9f98f3dd PB |
5 | */ |
6 | ||
e83f7e02 PB |
7 | #ifndef __MIPS_ASM_MIPS_CPS_H__ |
8 | # error Please include asm/mips-cps.h rather than asm/mips-cm.h | |
9 | #endif | |
10 | ||
9f98f3dd PB |
11 | #ifndef __MIPS_ASM_MIPS_CM_H__ |
12 | #define __MIPS_ASM_MIPS_CM_H__ | |
13 | ||
47b26a46 | 14 | #include <linux/bitops.h> |
56d4c99b | 15 | #include <linux/errno.h> |
9f98f3dd PB |
16 | |
17 | /* The base address of the CM GCR block */ | |
abe852ea | 18 | extern void __iomem *mips_gcr_base; |
9f98f3dd PB |
19 | |
20 | /* The base address of the CM L2-only sync region */ | |
21 | extern void __iomem *mips_cm_l2sync_base; | |
22 | ||
23 | /** | |
24 | * __mips_cm_phys_base - retrieve the physical base address of the CM | |
25 | * | |
26 | * This function returns the physical base address of the Coherence Manager | |
27 | * global control block, or 0 if no Coherence Manager is present. It provides | |
28 | * a default implementation which reads the CMGCRBase register where available, | |
92a76f6d | 29 | * and may be overridden by platforms which determine this address in a |
9f98f3dd PB |
30 | * different way by defining a function with the same prototype except for the |
31 | * name mips_cm_phys_base (without underscores). | |
32 | */ | |
15d45cce | 33 | extern phys_addr_t __mips_cm_phys_base(void); |
9f98f3dd | 34 | |
c0b584a2 MC |
35 | /* |
36 | * mips_cm_is64 - determine CM register width | |
37 | * | |
7784494a PB |
38 | * The CM register width is determined by the version of the CM, with CM3 |
39 | * introducing 64 bit GCRs and all prior CM versions having 32 bit GCRs. | |
40 | * However we may run a kernel built for MIPS32 on a system with 64 bit GCRs, | |
41 | * or vice-versa. This variable indicates the width of the memory accesses | |
42 | * that the kernel will perform to GCRs, which may differ from the actual | |
43 | * width of the GCRs. | |
c0b584a2 MC |
44 | * |
45 | * It's set to 0 for 32-bit accesses and 1 for 64-bit accesses. | |
46 | */ | |
47 | extern int mips_cm_is64; | |
48 | ||
3885c2b4 MC |
49 | /** |
50 | * mips_cm_error_report - Report CM cache errors | |
51 | */ | |
52 | #ifdef CONFIG_MIPS_CM | |
53 | extern void mips_cm_error_report(void); | |
54 | #else | |
55 | static inline void mips_cm_error_report(void) {} | |
56 | #endif | |
57 | ||
9f98f3dd PB |
58 | /** |
59 | * mips_cm_probe - probe for a Coherence Manager | |
60 | * | |
61 | * Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM | |
62 | * is successfully detected, else -errno. | |
63 | */ | |
64 | #ifdef CONFIG_MIPS_CM | |
65 | extern int mips_cm_probe(void); | |
66 | #else | |
67 | static inline int mips_cm_probe(void) | |
68 | { | |
69 | return -ENODEV; | |
70 | } | |
71 | #endif | |
72 | ||
73 | /** | |
74 | * mips_cm_present - determine whether a Coherence Manager is present | |
75 | * | |
76 | * Returns true if a CM is present in the system, else false. | |
77 | */ | |
78 | static inline bool mips_cm_present(void) | |
79 | { | |
80 | #ifdef CONFIG_MIPS_CM | |
abe852ea | 81 | return mips_gcr_base != NULL; |
9f98f3dd PB |
82 | #else |
83 | return false; | |
84 | #endif | |
85 | } | |
86 | ||
87 | /** | |
88 | * mips_cm_has_l2sync - determine whether an L2-only sync region is present | |
89 | * | |
90 | * Returns true if the system implements an L2-only sync region, else false. | |
91 | */ | |
92 | static inline bool mips_cm_has_l2sync(void) | |
93 | { | |
94 | #ifdef CONFIG_MIPS_CM | |
95 | return mips_cm_l2sync_base != NULL; | |
96 | #else | |
97 | return false; | |
98 | #endif | |
99 | } | |
100 | ||
101 | /* Offsets to register blocks from the CM base address */ | |
102 | #define MIPS_CM_GCB_OFS 0x0000 /* Global Control Block */ | |
103 | #define MIPS_CM_CLCB_OFS 0x2000 /* Core Local Control Block */ | |
104 | #define MIPS_CM_COCB_OFS 0x4000 /* Core Other Control Block */ | |
105 | #define MIPS_CM_GDB_OFS 0x6000 /* Global Debug Block */ | |
106 | ||
107 | /* Total size of the CM memory mapped registers */ | |
108 | #define MIPS_CM_GCR_SIZE 0x8000 | |
109 | ||
110 | /* Size of the L2-only sync region */ | |
111 | #define MIPS_CM_L2SYNC_SIZE 0x1000 | |
112 | ||
b025d518 | 113 | #define GCR_ACCESSOR_RO(sz, off, name) \ |
23cb600e PB |
114 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_GCB_OFS + off, name) \ |
115 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name) | |
9f98f3dd | 116 | |
b025d518 | 117 | #define GCR_ACCESSOR_RW(sz, off, name) \ |
23cb600e PB |
118 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_GCB_OFS + off, name) \ |
119 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name) | |
9f98f3dd | 120 | |
b025d518 PB |
121 | #define GCR_CX_ACCESSOR_RO(sz, off, name) \ |
122 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name) \ | |
123 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name) | |
9f98f3dd | 124 | |
b025d518 PB |
125 | #define GCR_CX_ACCESSOR_RW(sz, off, name) \ |
126 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name) \ | |
127 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name) | |
9f98f3dd | 128 | |
93c5bba5 | 129 | /* GCR_CONFIG - Information about the system */ |
b025d518 | 130 | GCR_ACCESSOR_RO(64, 0x000, config) |
23cb600e PB |
131 | #define CM_GCR_CONFIG_CLUSTER_COH_CAPABLE BIT_ULL(43) |
132 | #define CM_GCR_CONFIG_CLUSTER_ID GENMASK_ULL(39, 32) | |
133 | #define CM_GCR_CONFIG_NUM_CLUSTERS GENMASK(29, 23) | |
93c5bba5 PB |
134 | #define CM_GCR_CONFIG_NUMIOCU GENMASK(15, 8) |
135 | #define CM_GCR_CONFIG_PCORES GENMASK(7, 0) | |
136 | ||
137 | /* GCR_BASE - Base address of the Global Configuration Registers (GCRs) */ | |
b025d518 | 138 | GCR_ACCESSOR_RW(64, 0x008, base) |
93c5bba5 PB |
139 | #define CM_GCR_BASE_GCRBASE GENMASK_ULL(47, 15) |
140 | #define CM_GCR_BASE_CMDEFTGT GENMASK(1, 0) | |
6a6cba1d PB |
141 | #define CM_GCR_BASE_CMDEFTGT_MEM 0 |
142 | #define CM_GCR_BASE_CMDEFTGT_RESERVED 1 | |
93c5bba5 PB |
143 | #define CM_GCR_BASE_CMDEFTGT_IOCU0 2 |
144 | #define CM_GCR_BASE_CMDEFTGT_IOCU1 3 | |
145 | ||
146 | /* GCR_ACCESS - Controls core/IOCU access to GCRs */ | |
b025d518 | 147 | GCR_ACCESSOR_RW(32, 0x020, access) |
93c5bba5 PB |
148 | #define CM_GCR_ACCESS_ACCESSEN GENMASK(7, 0) |
149 | ||
150 | /* GCR_REV - Indicates the Coherence Manager revision */ | |
b025d518 | 151 | GCR_ACCESSOR_RO(32, 0x030, rev) |
93c5bba5 PB |
152 | #define CM_GCR_REV_MAJOR GENMASK(15, 8) |
153 | #define CM_GCR_REV_MINOR GENMASK(7, 0) | |
154 | ||
155 | #define CM_ENCODE_REV(major, minor) \ | |
156 | (((major) << __ffs(CM_GCR_REV_MAJOR)) | \ | |
157 | ((minor) << __ffs(CM_GCR_REV_MINOR))) | |
158 | ||
159 | #define CM_REV_CM2 CM_ENCODE_REV(6, 0) | |
160 | #define CM_REV_CM2_5 CM_ENCODE_REV(7, 0) | |
161 | #define CM_REV_CM3 CM_ENCODE_REV(8, 0) | |
23cb600e | 162 | #define CM_REV_CM3_5 CM_ENCODE_REV(9, 0) |
93c5bba5 PB |
163 | |
164 | /* GCR_ERR_CONTROL - Control error checking logic */ | |
b025d518 | 165 | GCR_ACCESSOR_RW(32, 0x038, err_control) |
93c5bba5 PB |
166 | #define CM_GCR_ERR_CONTROL_L2_ECC_EN BIT(1) |
167 | #define CM_GCR_ERR_CONTROL_L2_ECC_SUPPORT BIT(0) | |
168 | ||
169 | /* GCR_ERR_MASK - Control which errors are reported as interrupts */ | |
b025d518 | 170 | GCR_ACCESSOR_RW(64, 0x040, error_mask) |
93c5bba5 PB |
171 | |
172 | /* GCR_ERR_CAUSE - Indicates the type of error that occurred */ | |
b025d518 | 173 | GCR_ACCESSOR_RW(64, 0x048, error_cause) |
93c5bba5 PB |
174 | #define CM_GCR_ERROR_CAUSE_ERRTYPE GENMASK(31, 27) |
175 | #define CM3_GCR_ERROR_CAUSE_ERRTYPE GENMASK_ULL(63, 58) | |
176 | #define CM_GCR_ERROR_CAUSE_ERRINFO GENMASK(26, 0) | |
177 | ||
178 | /* GCR_ERR_ADDR - Indicates the address associated with an error */ | |
b025d518 | 179 | GCR_ACCESSOR_RW(64, 0x050, error_addr) |
93c5bba5 PB |
180 | |
181 | /* GCR_ERR_MULT - Indicates when multiple errors have occurred */ | |
b025d518 | 182 | GCR_ACCESSOR_RW(64, 0x058, error_mult) |
93c5bba5 PB |
183 | #define CM_GCR_ERROR_MULT_ERR2ND GENMASK(4, 0) |
184 | ||
185 | /* GCR_L2_ONLY_SYNC_BASE - Base address of the L2 cache-only sync region */ | |
b025d518 | 186 | GCR_ACCESSOR_RW(64, 0x070, l2_only_sync_base) |
93c5bba5 PB |
187 | #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE GENMASK(31, 12) |
188 | #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN BIT(0) | |
189 | ||
190 | /* GCR_GIC_BASE - Base address of the Global Interrupt Controller (GIC) */ | |
b025d518 | 191 | GCR_ACCESSOR_RW(64, 0x080, gic_base) |
93c5bba5 PB |
192 | #define CM_GCR_GIC_BASE_GICBASE GENMASK(31, 17) |
193 | #define CM_GCR_GIC_BASE_GICEN BIT(0) | |
194 | ||
195 | /* GCR_CPC_BASE - Base address of the Cluster Power Controller (CPC) */ | |
b025d518 | 196 | GCR_ACCESSOR_RW(64, 0x088, cpc_base) |
93c5bba5 PB |
197 | #define CM_GCR_CPC_BASE_CPCBASE GENMASK(31, 15) |
198 | #define CM_GCR_CPC_BASE_CPCEN BIT(0) | |
199 | ||
200 | /* GCR_REGn_BASE - Base addresses of CM address regions */ | |
b025d518 | 201 | GCR_ACCESSOR_RW(64, 0x090, reg0_base) |
b025d518 | 202 | GCR_ACCESSOR_RW(64, 0x0a0, reg1_base) |
b025d518 | 203 | GCR_ACCESSOR_RW(64, 0x0b0, reg2_base) |
b025d518 | 204 | GCR_ACCESSOR_RW(64, 0x0c0, reg3_base) |
93c5bba5 PB |
205 | #define CM_GCR_REGn_BASE_BASEADDR GENMASK(31, 16) |
206 | ||
207 | /* GCR_REGn_MASK - Size & destination of CM address regions */ | |
208 | GCR_ACCESSOR_RW(64, 0x098, reg0_mask) | |
209 | GCR_ACCESSOR_RW(64, 0x0a8, reg1_mask) | |
210 | GCR_ACCESSOR_RW(64, 0x0b8, reg2_mask) | |
b025d518 | 211 | GCR_ACCESSOR_RW(64, 0x0c8, reg3_mask) |
93c5bba5 PB |
212 | #define CM_GCR_REGn_MASK_ADDRMASK GENMASK(31, 16) |
213 | #define CM_GCR_REGn_MASK_CCAOVR GENMASK(7, 5) | |
214 | #define CM_GCR_REGn_MASK_CCAOVREN BIT(4) | |
215 | #define CM_GCR_REGn_MASK_DROPL2 BIT(2) | |
216 | #define CM_GCR_REGn_MASK_CMTGT GENMASK(1, 0) | |
217 | #define CM_GCR_REGn_MASK_CMTGT_DISABLED 0x0 | |
218 | #define CM_GCR_REGn_MASK_CMTGT_MEM 0x1 | |
219 | #define CM_GCR_REGn_MASK_CMTGT_IOCU0 0x2 | |
220 | #define CM_GCR_REGn_MASK_CMTGT_IOCU1 0x3 | |
221 | ||
222 | /* GCR_GIC_STATUS - Indicates presence of a Global Interrupt Controller (GIC) */ | |
b025d518 | 223 | GCR_ACCESSOR_RO(32, 0x0d0, gic_status) |
93c5bba5 PB |
224 | #define CM_GCR_GIC_STATUS_EX BIT(0) |
225 | ||
226 | /* GCR_CPC_STATUS - Indicates presence of a Cluster Power Controller (CPC) */ | |
b025d518 | 227 | GCR_ACCESSOR_RO(32, 0x0f0, cpc_status) |
93c5bba5 PB |
228 | #define CM_GCR_CPC_STATUS_EX BIT(0) |
229 | ||
230 | /* GCR_L2_CONFIG - Indicates L2 cache configuration when Config5.L2C=1 */ | |
b025d518 | 231 | GCR_ACCESSOR_RW(32, 0x130, l2_config) |
93c5bba5 PB |
232 | #define CM_GCR_L2_CONFIG_BYPASS BIT(20) |
233 | #define CM_GCR_L2_CONFIG_SET_SIZE GENMASK(15, 12) | |
234 | #define CM_GCR_L2_CONFIG_LINE_SIZE GENMASK(11, 8) | |
235 | #define CM_GCR_L2_CONFIG_ASSOC GENMASK(7, 0) | |
236 | ||
237 | /* GCR_SYS_CONFIG2 - Further information about the system */ | |
b025d518 | 238 | GCR_ACCESSOR_RO(32, 0x150, sys_config2) |
93c5bba5 PB |
239 | #define CM_GCR_SYS_CONFIG2_MAXVPW GENMASK(3, 0) |
240 | ||
241 | /* GCR_L2_PFT_CONTROL - Controls hardware L2 prefetching */ | |
b025d518 | 242 | GCR_ACCESSOR_RW(32, 0x300, l2_pft_control) |
93c5bba5 PB |
243 | #define CM_GCR_L2_PFT_CONTROL_PAGEMASK GENMASK(31, 12) |
244 | #define CM_GCR_L2_PFT_CONTROL_PFTEN BIT(8) | |
245 | #define CM_GCR_L2_PFT_CONTROL_NPFT GENMASK(7, 0) | |
246 | ||
247 | /* GCR_L2_PFT_CONTROL_B - Controls hardware L2 prefetching */ | |
b025d518 | 248 | GCR_ACCESSOR_RW(32, 0x308, l2_pft_control_b) |
93c5bba5 PB |
249 | #define CM_GCR_L2_PFT_CONTROL_B_CEN BIT(8) |
250 | #define CM_GCR_L2_PFT_CONTROL_B_PORTID GENMASK(7, 0) | |
251 | ||
23cb600e PB |
252 | /* GCR_L2SM_COP - L2 cache op state machine control */ |
253 | GCR_ACCESSOR_RW(32, 0x620, l2sm_cop) | |
254 | #define CM_GCR_L2SM_COP_PRESENT BIT(31) | |
255 | #define CM_GCR_L2SM_COP_RESULT GENMASK(8, 6) | |
256 | #define CM_GCR_L2SM_COP_RESULT_DONTCARE 0 | |
257 | #define CM_GCR_L2SM_COP_RESULT_DONE_OK 1 | |
258 | #define CM_GCR_L2SM_COP_RESULT_DONE_ERROR 2 | |
259 | #define CM_GCR_L2SM_COP_RESULT_ABORT_OK 3 | |
260 | #define CM_GCR_L2SM_COP_RESULT_ABORT_ERROR 4 | |
261 | #define CM_GCR_L2SM_COP_RUNNING BIT(5) | |
262 | #define CM_GCR_L2SM_COP_TYPE GENMASK(4, 2) | |
263 | #define CM_GCR_L2SM_COP_TYPE_IDX_WBINV 0 | |
264 | #define CM_GCR_L2SM_COP_TYPE_IDX_STORETAG 1 | |
265 | #define CM_GCR_L2SM_COP_TYPE_IDX_STORETAGDATA 2 | |
266 | #define CM_GCR_L2SM_COP_TYPE_HIT_INV 4 | |
267 | #define CM_GCR_L2SM_COP_TYPE_HIT_WBINV 5 | |
268 | #define CM_GCR_L2SM_COP_TYPE_HIT_WB 6 | |
269 | #define CM_GCR_L2SM_COP_TYPE_FETCHLOCK 7 | |
270 | #define CM_GCR_L2SM_COP_CMD GENMASK(1, 0) | |
271 | #define CM_GCR_L2SM_COP_CMD_START 1 /* only when idle */ | |
272 | #define CM_GCR_L2SM_COP_CMD_ABORT 3 /* only when running */ | |
273 | ||
274 | /* GCR_L2SM_TAG_ADDR_COP - L2 cache op state machine address control */ | |
275 | GCR_ACCESSOR_RW(64, 0x628, l2sm_tag_addr_cop) | |
276 | #define CM_GCR_L2SM_TAG_ADDR_COP_NUM_LINES GENMASK_ULL(63, 48) | |
277 | #define CM_GCR_L2SM_TAG_ADDR_COP_START_TAG GENMASK_ULL(47, 6) | |
278 | ||
93c5bba5 | 279 | /* GCR_BEV_BASE - Controls the location of the BEV for powered up cores */ |
b025d518 | 280 | GCR_ACCESSOR_RW(64, 0x680, bev_base) |
9f98f3dd | 281 | |
93c5bba5 | 282 | /* GCR_Cx_RESET_RELEASE - Controls core reset for CM 1.x */ |
b025d518 | 283 | GCR_CX_ACCESSOR_RW(32, 0x000, reset_release) |
9f98f3dd | 284 | |
93c5bba5 PB |
285 | /* GCR_Cx_COHERENCE - Controls core coherence */ |
286 | GCR_CX_ACCESSOR_RW(32, 0x008, coherence) | |
287 | #define CM_GCR_Cx_COHERENCE_COHDOMAINEN GENMASK(7, 0) | |
288 | #define CM3_GCR_Cx_COHERENCE_COHEN BIT(0) | |
497e803e | 289 | |
93c5bba5 PB |
290 | /* GCR_Cx_CONFIG - Information about a core's configuration */ |
291 | GCR_CX_ACCESSOR_RO(32, 0x010, config) | |
292 | #define CM_GCR_Cx_CONFIG_IOCUTYPE GENMASK(11, 10) | |
293 | #define CM_GCR_Cx_CONFIG_PVPE GENMASK(9, 0) | |
9f98f3dd | 294 | |
93c5bba5 PB |
295 | /* GCR_Cx_OTHER - Configure the core-other/redirect GCR block */ |
296 | GCR_CX_ACCESSOR_RW(32, 0x018, other) | |
23cb600e PB |
297 | #define CM_GCR_Cx_OTHER_CORENUM GENMASK(31, 16) /* CM < 3 */ |
298 | #define CM_GCR_Cx_OTHER_CLUSTER_EN BIT(31) /* CM >= 3.5 */ | |
299 | #define CM_GCR_Cx_OTHER_GIC_EN BIT(30) /* CM >= 3.5 */ | |
300 | #define CM_GCR_Cx_OTHER_BLOCK GENMASK(25, 24) /* CM >= 3.5 */ | |
301 | #define CM_GCR_Cx_OTHER_BLOCK_LOCAL 0 | |
302 | #define CM_GCR_Cx_OTHER_BLOCK_GLOBAL 1 | |
303 | #define CM_GCR_Cx_OTHER_BLOCK_USER 2 | |
304 | #define CM_GCR_Cx_OTHER_BLOCK_GLOBAL_HIGH 3 | |
305 | #define CM_GCR_Cx_OTHER_CLUSTER GENMASK(21, 16) /* CM >= 3.5 */ | |
306 | #define CM3_GCR_Cx_OTHER_CORE GENMASK(13, 8) /* CM >= 3 */ | |
307 | #define CM_GCR_Cx_OTHER_CORE_CM 32 | |
308 | #define CM3_GCR_Cx_OTHER_VP GENMASK(2, 0) /* CM >= 3 */ | |
9f98f3dd | 309 | |
93c5bba5 PB |
310 | /* GCR_Cx_RESET_BASE - Configure where powered up cores will fetch from */ |
311 | GCR_CX_ACCESSOR_RW(32, 0x020, reset_base) | |
312 | #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE GENMASK(31, 12) | |
197e89e0 | 313 | |
93c5bba5 PB |
314 | /* GCR_Cx_ID - Identify the current core */ |
315 | GCR_CX_ACCESSOR_RO(32, 0x028, id) | |
23cb600e PB |
316 | #define CM_GCR_Cx_ID_CLUSTER GENMASK(15, 8) |
317 | #define CM_GCR_Cx_ID_CORE GENMASK(7, 0) | |
197e89e0 | 318 | |
93c5bba5 PB |
319 | /* GCR_Cx_RESET_EXT_BASE - Configure behaviour when cores reset or power up */ |
320 | GCR_CX_ACCESSOR_RW(32, 0x030, reset_ext_base) | |
321 | #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET BIT(31) | |
322 | #define CM_GCR_Cx_RESET_EXT_BASE_UEB BIT(30) | |
323 | #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK GENMASK(27, 20) | |
324 | #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA GENMASK(7, 1) | |
325 | #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT BIT(0) | |
9f98f3dd | 326 | |
9f98f3dd PB |
327 | /** |
328 | * mips_cm_l2sync - perform an L2-only sync operation | |
329 | * | |
330 | * If an L2-only sync region is present in the system then this function | |
331 | * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV. | |
332 | */ | |
333 | static inline int mips_cm_l2sync(void) | |
334 | { | |
335 | if (!mips_cm_has_l2sync()) | |
336 | return -ENODEV; | |
337 | ||
338 | writel(0, mips_cm_l2sync_base); | |
339 | return 0; | |
340 | } | |
341 | ||
197e89e0 PB |
342 | /** |
343 | * mips_cm_revision() - return CM revision | |
344 | * | |
345 | * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The | |
346 | * return value should be checked against the CM_REV_* macros. | |
347 | */ | |
348 | static inline int mips_cm_revision(void) | |
349 | { | |
350 | if (!mips_cm_present()) | |
351 | return 0; | |
352 | ||
353 | return read_gcr_rev(); | |
354 | } | |
355 | ||
7573b94e PB |
356 | /** |
357 | * mips_cm_max_vp_width() - return the width in bits of VP indices | |
358 | * | |
359 | * Return: the width, in bits, of VP indices in fields that combine core & VP | |
360 | * indices. | |
361 | */ | |
362 | static inline unsigned int mips_cm_max_vp_width(void) | |
363 | { | |
364 | extern int smp_num_siblings; | |
6605d156 | 365 | uint32_t cfg; |
7573b94e PB |
366 | |
367 | if (mips_cm_revision() >= CM_REV_CM3) | |
93c5bba5 | 368 | return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW; |
7573b94e | 369 | |
6605d156 PB |
370 | if (mips_cm_present()) { |
371 | /* | |
372 | * We presume that all cores in the system will have the same | |
373 | * number of VP(E)s, and if that ever changes then this will | |
374 | * need revisiting. | |
375 | */ | |
93c5bba5 PB |
376 | cfg = read_gcr_cl_config() & CM_GCR_Cx_CONFIG_PVPE; |
377 | return (cfg >> __ffs(CM_GCR_Cx_CONFIG_PVPE)) + 1; | |
6605d156 PB |
378 | } |
379 | ||
97f2645f | 380 | if (IS_ENABLED(CONFIG_SMP)) |
a60ae81e PB |
381 | return smp_num_siblings; |
382 | ||
383 | return 1; | |
7573b94e PB |
384 | } |
385 | ||
386 | /** | |
387 | * mips_cm_vp_id() - calculate the hardware VP ID for a CPU | |
388 | * @cpu: the CPU whose VP ID to calculate | |
389 | * | |
390 | * Hardware such as the GIC uses identifiers for VPs which may not match the | |
391 | * CPU numbers used by Linux. This function calculates the hardware VP | |
392 | * identifier corresponding to a given CPU. | |
393 | * | |
394 | * Return: the VP ID for the CPU. | |
395 | */ | |
396 | static inline unsigned int mips_cm_vp_id(unsigned int cpu) | |
397 | { | |
f875a832 | 398 | unsigned int core = cpu_core(&cpu_data[cpu]); |
7573b94e PB |
399 | unsigned int vp = cpu_vpe_id(&cpu_data[cpu]); |
400 | ||
401 | return (core * mips_cm_max_vp_width()) + vp; | |
402 | } | |
403 | ||
23d5de8e PB |
404 | #ifdef CONFIG_MIPS_CM |
405 | ||
406 | /** | |
68923cdc PB |
407 | * mips_cm_lock_other - lock access to redirect/other region |
408 | * @cluster: the other cluster to be accessed | |
23d5de8e PB |
409 | * @core: the other core to be accessed |
410 | * @vp: the VP within the other core to be accessed | |
68923cdc | 411 | * @block: the register block to be accessed |
23d5de8e | 412 | * |
68923cdc PB |
413 | * Configure the redirect/other region for the local core/VP (depending upon |
414 | * the CM revision) to target the specified @cluster, @core, @vp & register | |
415 | * @block. Must be called before using the redirect/other region, and followed | |
416 | * by a call to mips_cm_unlock_other() when access to the redirect/other region | |
417 | * is complete. | |
418 | * | |
419 | * This function acquires a spinlock such that code between it & | |
420 | * mips_cm_unlock_other() calls cannot be pre-empted by anything which may | |
421 | * reconfigure the redirect/other region, and cannot be interfered with by | |
422 | * another VP in the core. As such calls to this function should not be nested. | |
23d5de8e | 423 | */ |
68923cdc PB |
424 | extern void mips_cm_lock_other(unsigned int cluster, unsigned int core, |
425 | unsigned int vp, unsigned int block); | |
23d5de8e PB |
426 | |
427 | /** | |
68923cdc | 428 | * mips_cm_unlock_other - unlock access to redirect/other region |
23d5de8e | 429 | * |
68923cdc PB |
430 | * Must be called after mips_cm_lock_other() once all required access to the |
431 | * redirect/other region has been completed. | |
23d5de8e PB |
432 | */ |
433 | extern void mips_cm_unlock_other(void); | |
434 | ||
435 | #else /* !CONFIG_MIPS_CM */ | |
436 | ||
68923cdc PB |
437 | static inline void mips_cm_lock_other(unsigned int cluster, unsigned int core, |
438 | unsigned int vp, unsigned int block) { } | |
23d5de8e PB |
439 | static inline void mips_cm_unlock_other(void) { } |
440 | ||
441 | #endif /* !CONFIG_MIPS_CM */ | |
442 | ||
68923cdc PB |
443 | /** |
444 | * mips_cm_lock_other_cpu - lock access to redirect/other region | |
445 | * @cpu: the other CPU whose register we want to access | |
446 | * | |
447 | * Configure the redirect/other region for the local core/VP (depending upon | |
448 | * the CM revision) to target the specified @cpu & register @block. This is | |
449 | * equivalent to calling mips_cm_lock_other() but accepts a Linux CPU number | |
450 | * for convenience. | |
451 | */ | |
452 | static inline void mips_cm_lock_other_cpu(unsigned int cpu, unsigned int block) | |
453 | { | |
454 | struct cpuinfo_mips *d = &cpu_data[cpu]; | |
455 | ||
456 | mips_cm_lock_other(cpu_cluster(d), cpu_core(d), cpu_vpe_id(d), block); | |
457 | } | |
458 | ||
9f98f3dd | 459 | #endif /* __MIPS_ASM_MIPS_CM_H__ */ |