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1 | /* | |
2 | * Copyright (C) 2013 Imagination Technologies | |
3 | * Author: Paul Burton <paul.burton@mips.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | */ | |
10 | ||
11 | #ifndef __MIPS_ASM_MIPS_CPS_H__ | |
12 | # error Please include asm/mips-cps.h rather than asm/mips-cm.h | |
13 | #endif | |
14 | ||
15 | #ifndef __MIPS_ASM_MIPS_CM_H__ | |
16 | #define __MIPS_ASM_MIPS_CM_H__ | |
17 | ||
18 | #include <linux/bitops.h> | |
19 | #include <linux/errno.h> | |
20 | ||
21 | /* The base address of the CM GCR block */ | |
22 | extern void __iomem *mips_gcr_base; | |
23 | ||
24 | /* The base address of the CM L2-only sync region */ | |
25 | extern void __iomem *mips_cm_l2sync_base; | |
26 | ||
27 | /** | |
28 | * __mips_cm_phys_base - retrieve the physical base address of the CM | |
29 | * | |
30 | * This function returns the physical base address of the Coherence Manager | |
31 | * global control block, or 0 if no Coherence Manager is present. It provides | |
32 | * a default implementation which reads the CMGCRBase register where available, | |
33 | * and may be overridden by platforms which determine this address in a | |
34 | * different way by defining a function with the same prototype except for the | |
35 | * name mips_cm_phys_base (without underscores). | |
36 | */ | |
37 | extern phys_addr_t __mips_cm_phys_base(void); | |
38 | ||
39 | /* | |
40 | * mips_cm_is64 - determine CM register width | |
41 | * | |
42 | * The CM register width is determined by the version of the CM, with CM3 | |
43 | * introducing 64 bit GCRs and all prior CM versions having 32 bit GCRs. | |
44 | * However we may run a kernel built for MIPS32 on a system with 64 bit GCRs, | |
45 | * or vice-versa. This variable indicates the width of the memory accesses | |
46 | * that the kernel will perform to GCRs, which may differ from the actual | |
47 | * width of the GCRs. | |
48 | * | |
49 | * It's set to 0 for 32-bit accesses and 1 for 64-bit accesses. | |
50 | */ | |
51 | extern int mips_cm_is64; | |
52 | ||
53 | /** | |
54 | * mips_cm_error_report - Report CM cache errors | |
55 | */ | |
56 | #ifdef CONFIG_MIPS_CM | |
57 | extern void mips_cm_error_report(void); | |
58 | #else | |
59 | static inline void mips_cm_error_report(void) {} | |
60 | #endif | |
61 | ||
62 | /** | |
63 | * mips_cm_probe - probe for a Coherence Manager | |
64 | * | |
65 | * Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM | |
66 | * is successfully detected, else -errno. | |
67 | */ | |
68 | #ifdef CONFIG_MIPS_CM | |
69 | extern int mips_cm_probe(void); | |
70 | #else | |
71 | static inline int mips_cm_probe(void) | |
72 | { | |
73 | return -ENODEV; | |
74 | } | |
75 | #endif | |
76 | ||
77 | /** | |
78 | * mips_cm_present - determine whether a Coherence Manager is present | |
79 | * | |
80 | * Returns true if a CM is present in the system, else false. | |
81 | */ | |
82 | static inline bool mips_cm_present(void) | |
83 | { | |
84 | #ifdef CONFIG_MIPS_CM | |
85 | return mips_gcr_base != NULL; | |
86 | #else | |
87 | return false; | |
88 | #endif | |
89 | } | |
90 | ||
91 | /** | |
92 | * mips_cm_has_l2sync - determine whether an L2-only sync region is present | |
93 | * | |
94 | * Returns true if the system implements an L2-only sync region, else false. | |
95 | */ | |
96 | static inline bool mips_cm_has_l2sync(void) | |
97 | { | |
98 | #ifdef CONFIG_MIPS_CM | |
99 | return mips_cm_l2sync_base != NULL; | |
100 | #else | |
101 | return false; | |
102 | #endif | |
103 | } | |
104 | ||
105 | /* Offsets to register blocks from the CM base address */ | |
106 | #define MIPS_CM_GCB_OFS 0x0000 /* Global Control Block */ | |
107 | #define MIPS_CM_CLCB_OFS 0x2000 /* Core Local Control Block */ | |
108 | #define MIPS_CM_COCB_OFS 0x4000 /* Core Other Control Block */ | |
109 | #define MIPS_CM_GDB_OFS 0x6000 /* Global Debug Block */ | |
110 | ||
111 | /* Total size of the CM memory mapped registers */ | |
112 | #define MIPS_CM_GCR_SIZE 0x8000 | |
113 | ||
114 | /* Size of the L2-only sync region */ | |
115 | #define MIPS_CM_L2SYNC_SIZE 0x1000 | |
116 | ||
117 | #define GCR_ACCESSOR_RO(sz, off, name) \ | |
118 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_GCB_OFS + off, name) \ | |
119 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name) | |
120 | ||
121 | #define GCR_ACCESSOR_RW(sz, off, name) \ | |
122 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_GCB_OFS + off, name) \ | |
123 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name) | |
124 | ||
125 | #define GCR_CX_ACCESSOR_RO(sz, off, name) \ | |
126 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name) \ | |
127 | CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name) | |
128 | ||
129 | #define GCR_CX_ACCESSOR_RW(sz, off, name) \ | |
130 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name) \ | |
131 | CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name) | |
132 | ||
133 | /* GCR_CONFIG - Information about the system */ | |
134 | GCR_ACCESSOR_RO(64, 0x000, config) | |
135 | #define CM_GCR_CONFIG_CLUSTER_COH_CAPABLE BIT_ULL(43) | |
136 | #define CM_GCR_CONFIG_CLUSTER_ID GENMASK_ULL(39, 32) | |
137 | #define CM_GCR_CONFIG_NUM_CLUSTERS GENMASK(29, 23) | |
138 | #define CM_GCR_CONFIG_NUMIOCU GENMASK(15, 8) | |
139 | #define CM_GCR_CONFIG_PCORES GENMASK(7, 0) | |
140 | ||
141 | /* GCR_BASE - Base address of the Global Configuration Registers (GCRs) */ | |
142 | GCR_ACCESSOR_RW(64, 0x008, base) | |
143 | #define CM_GCR_BASE_GCRBASE GENMASK_ULL(47, 15) | |
144 | #define CM_GCR_BASE_CMDEFTGT GENMASK(1, 0) | |
145 | #define CM_GCR_BASE_CMDEFTGT_MEM 0 | |
146 | #define CM_GCR_BASE_CMDEFTGT_RESERVED 1 | |
147 | #define CM_GCR_BASE_CMDEFTGT_IOCU0 2 | |
148 | #define CM_GCR_BASE_CMDEFTGT_IOCU1 3 | |
149 | ||
150 | /* GCR_ACCESS - Controls core/IOCU access to GCRs */ | |
151 | GCR_ACCESSOR_RW(32, 0x020, access) | |
152 | #define CM_GCR_ACCESS_ACCESSEN GENMASK(7, 0) | |
153 | ||
154 | /* GCR_REV - Indicates the Coherence Manager revision */ | |
155 | GCR_ACCESSOR_RO(32, 0x030, rev) | |
156 | #define CM_GCR_REV_MAJOR GENMASK(15, 8) | |
157 | #define CM_GCR_REV_MINOR GENMASK(7, 0) | |
158 | ||
159 | #define CM_ENCODE_REV(major, minor) \ | |
160 | (((major) << __ffs(CM_GCR_REV_MAJOR)) | \ | |
161 | ((minor) << __ffs(CM_GCR_REV_MINOR))) | |
162 | ||
163 | #define CM_REV_CM2 CM_ENCODE_REV(6, 0) | |
164 | #define CM_REV_CM2_5 CM_ENCODE_REV(7, 0) | |
165 | #define CM_REV_CM3 CM_ENCODE_REV(8, 0) | |
166 | #define CM_REV_CM3_5 CM_ENCODE_REV(9, 0) | |
167 | ||
168 | /* GCR_ERR_CONTROL - Control error checking logic */ | |
169 | GCR_ACCESSOR_RW(32, 0x038, err_control) | |
170 | #define CM_GCR_ERR_CONTROL_L2_ECC_EN BIT(1) | |
171 | #define CM_GCR_ERR_CONTROL_L2_ECC_SUPPORT BIT(0) | |
172 | ||
173 | /* GCR_ERR_MASK - Control which errors are reported as interrupts */ | |
174 | GCR_ACCESSOR_RW(64, 0x040, error_mask) | |
175 | ||
176 | /* GCR_ERR_CAUSE - Indicates the type of error that occurred */ | |
177 | GCR_ACCESSOR_RW(64, 0x048, error_cause) | |
178 | #define CM_GCR_ERROR_CAUSE_ERRTYPE GENMASK(31, 27) | |
179 | #define CM3_GCR_ERROR_CAUSE_ERRTYPE GENMASK_ULL(63, 58) | |
180 | #define CM_GCR_ERROR_CAUSE_ERRINFO GENMASK(26, 0) | |
181 | ||
182 | /* GCR_ERR_ADDR - Indicates the address associated with an error */ | |
183 | GCR_ACCESSOR_RW(64, 0x050, error_addr) | |
184 | ||
185 | /* GCR_ERR_MULT - Indicates when multiple errors have occurred */ | |
186 | GCR_ACCESSOR_RW(64, 0x058, error_mult) | |
187 | #define CM_GCR_ERROR_MULT_ERR2ND GENMASK(4, 0) | |
188 | ||
189 | /* GCR_L2_ONLY_SYNC_BASE - Base address of the L2 cache-only sync region */ | |
190 | GCR_ACCESSOR_RW(64, 0x070, l2_only_sync_base) | |
191 | #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE GENMASK(31, 12) | |
192 | #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN BIT(0) | |
193 | ||
194 | /* GCR_GIC_BASE - Base address of the Global Interrupt Controller (GIC) */ | |
195 | GCR_ACCESSOR_RW(64, 0x080, gic_base) | |
196 | #define CM_GCR_GIC_BASE_GICBASE GENMASK(31, 17) | |
197 | #define CM_GCR_GIC_BASE_GICEN BIT(0) | |
198 | ||
199 | /* GCR_CPC_BASE - Base address of the Cluster Power Controller (CPC) */ | |
200 | GCR_ACCESSOR_RW(64, 0x088, cpc_base) | |
201 | #define CM_GCR_CPC_BASE_CPCBASE GENMASK(31, 15) | |
202 | #define CM_GCR_CPC_BASE_CPCEN BIT(0) | |
203 | ||
204 | /* GCR_REGn_BASE - Base addresses of CM address regions */ | |
205 | GCR_ACCESSOR_RW(64, 0x090, reg0_base) | |
206 | GCR_ACCESSOR_RW(64, 0x0a0, reg1_base) | |
207 | GCR_ACCESSOR_RW(64, 0x0b0, reg2_base) | |
208 | GCR_ACCESSOR_RW(64, 0x0c0, reg3_base) | |
209 | #define CM_GCR_REGn_BASE_BASEADDR GENMASK(31, 16) | |
210 | ||
211 | /* GCR_REGn_MASK - Size & destination of CM address regions */ | |
212 | GCR_ACCESSOR_RW(64, 0x098, reg0_mask) | |
213 | GCR_ACCESSOR_RW(64, 0x0a8, reg1_mask) | |
214 | GCR_ACCESSOR_RW(64, 0x0b8, reg2_mask) | |
215 | GCR_ACCESSOR_RW(64, 0x0c8, reg3_mask) | |
216 | #define CM_GCR_REGn_MASK_ADDRMASK GENMASK(31, 16) | |
217 | #define CM_GCR_REGn_MASK_CCAOVR GENMASK(7, 5) | |
218 | #define CM_GCR_REGn_MASK_CCAOVREN BIT(4) | |
219 | #define CM_GCR_REGn_MASK_DROPL2 BIT(2) | |
220 | #define CM_GCR_REGn_MASK_CMTGT GENMASK(1, 0) | |
221 | #define CM_GCR_REGn_MASK_CMTGT_DISABLED 0x0 | |
222 | #define CM_GCR_REGn_MASK_CMTGT_MEM 0x1 | |
223 | #define CM_GCR_REGn_MASK_CMTGT_IOCU0 0x2 | |
224 | #define CM_GCR_REGn_MASK_CMTGT_IOCU1 0x3 | |
225 | ||
226 | /* GCR_GIC_STATUS - Indicates presence of a Global Interrupt Controller (GIC) */ | |
227 | GCR_ACCESSOR_RO(32, 0x0d0, gic_status) | |
228 | #define CM_GCR_GIC_STATUS_EX BIT(0) | |
229 | ||
230 | /* GCR_CPC_STATUS - Indicates presence of a Cluster Power Controller (CPC) */ | |
231 | GCR_ACCESSOR_RO(32, 0x0f0, cpc_status) | |
232 | #define CM_GCR_CPC_STATUS_EX BIT(0) | |
233 | ||
234 | /* GCR_L2_CONFIG - Indicates L2 cache configuration when Config5.L2C=1 */ | |
235 | GCR_ACCESSOR_RW(32, 0x130, l2_config) | |
236 | #define CM_GCR_L2_CONFIG_BYPASS BIT(20) | |
237 | #define CM_GCR_L2_CONFIG_SET_SIZE GENMASK(15, 12) | |
238 | #define CM_GCR_L2_CONFIG_LINE_SIZE GENMASK(11, 8) | |
239 | #define CM_GCR_L2_CONFIG_ASSOC GENMASK(7, 0) | |
240 | ||
241 | /* GCR_SYS_CONFIG2 - Further information about the system */ | |
242 | GCR_ACCESSOR_RO(32, 0x150, sys_config2) | |
243 | #define CM_GCR_SYS_CONFIG2_MAXVPW GENMASK(3, 0) | |
244 | ||
245 | /* GCR_L2_PFT_CONTROL - Controls hardware L2 prefetching */ | |
246 | GCR_ACCESSOR_RW(32, 0x300, l2_pft_control) | |
247 | #define CM_GCR_L2_PFT_CONTROL_PAGEMASK GENMASK(31, 12) | |
248 | #define CM_GCR_L2_PFT_CONTROL_PFTEN BIT(8) | |
249 | #define CM_GCR_L2_PFT_CONTROL_NPFT GENMASK(7, 0) | |
250 | ||
251 | /* GCR_L2_PFT_CONTROL_B - Controls hardware L2 prefetching */ | |
252 | GCR_ACCESSOR_RW(32, 0x308, l2_pft_control_b) | |
253 | #define CM_GCR_L2_PFT_CONTROL_B_CEN BIT(8) | |
254 | #define CM_GCR_L2_PFT_CONTROL_B_PORTID GENMASK(7, 0) | |
255 | ||
256 | /* GCR_L2SM_COP - L2 cache op state machine control */ | |
257 | GCR_ACCESSOR_RW(32, 0x620, l2sm_cop) | |
258 | #define CM_GCR_L2SM_COP_PRESENT BIT(31) | |
259 | #define CM_GCR_L2SM_COP_RESULT GENMASK(8, 6) | |
260 | #define CM_GCR_L2SM_COP_RESULT_DONTCARE 0 | |
261 | #define CM_GCR_L2SM_COP_RESULT_DONE_OK 1 | |
262 | #define CM_GCR_L2SM_COP_RESULT_DONE_ERROR 2 | |
263 | #define CM_GCR_L2SM_COP_RESULT_ABORT_OK 3 | |
264 | #define CM_GCR_L2SM_COP_RESULT_ABORT_ERROR 4 | |
265 | #define CM_GCR_L2SM_COP_RUNNING BIT(5) | |
266 | #define CM_GCR_L2SM_COP_TYPE GENMASK(4, 2) | |
267 | #define CM_GCR_L2SM_COP_TYPE_IDX_WBINV 0 | |
268 | #define CM_GCR_L2SM_COP_TYPE_IDX_STORETAG 1 | |
269 | #define CM_GCR_L2SM_COP_TYPE_IDX_STORETAGDATA 2 | |
270 | #define CM_GCR_L2SM_COP_TYPE_HIT_INV 4 | |
271 | #define CM_GCR_L2SM_COP_TYPE_HIT_WBINV 5 | |
272 | #define CM_GCR_L2SM_COP_TYPE_HIT_WB 6 | |
273 | #define CM_GCR_L2SM_COP_TYPE_FETCHLOCK 7 | |
274 | #define CM_GCR_L2SM_COP_CMD GENMASK(1, 0) | |
275 | #define CM_GCR_L2SM_COP_CMD_START 1 /* only when idle */ | |
276 | #define CM_GCR_L2SM_COP_CMD_ABORT 3 /* only when running */ | |
277 | ||
278 | /* GCR_L2SM_TAG_ADDR_COP - L2 cache op state machine address control */ | |
279 | GCR_ACCESSOR_RW(64, 0x628, l2sm_tag_addr_cop) | |
280 | #define CM_GCR_L2SM_TAG_ADDR_COP_NUM_LINES GENMASK_ULL(63, 48) | |
281 | #define CM_GCR_L2SM_TAG_ADDR_COP_START_TAG GENMASK_ULL(47, 6) | |
282 | ||
283 | /* GCR_BEV_BASE - Controls the location of the BEV for powered up cores */ | |
284 | GCR_ACCESSOR_RW(64, 0x680, bev_base) | |
285 | ||
286 | /* GCR_Cx_RESET_RELEASE - Controls core reset for CM 1.x */ | |
287 | GCR_CX_ACCESSOR_RW(32, 0x000, reset_release) | |
288 | ||
289 | /* GCR_Cx_COHERENCE - Controls core coherence */ | |
290 | GCR_CX_ACCESSOR_RW(32, 0x008, coherence) | |
291 | #define CM_GCR_Cx_COHERENCE_COHDOMAINEN GENMASK(7, 0) | |
292 | #define CM3_GCR_Cx_COHERENCE_COHEN BIT(0) | |
293 | ||
294 | /* GCR_Cx_CONFIG - Information about a core's configuration */ | |
295 | GCR_CX_ACCESSOR_RO(32, 0x010, config) | |
296 | #define CM_GCR_Cx_CONFIG_IOCUTYPE GENMASK(11, 10) | |
297 | #define CM_GCR_Cx_CONFIG_PVPE GENMASK(9, 0) | |
298 | ||
299 | /* GCR_Cx_OTHER - Configure the core-other/redirect GCR block */ | |
300 | GCR_CX_ACCESSOR_RW(32, 0x018, other) | |
301 | #define CM_GCR_Cx_OTHER_CORENUM GENMASK(31, 16) /* CM < 3 */ | |
302 | #define CM_GCR_Cx_OTHER_CLUSTER_EN BIT(31) /* CM >= 3.5 */ | |
303 | #define CM_GCR_Cx_OTHER_GIC_EN BIT(30) /* CM >= 3.5 */ | |
304 | #define CM_GCR_Cx_OTHER_BLOCK GENMASK(25, 24) /* CM >= 3.5 */ | |
305 | #define CM_GCR_Cx_OTHER_BLOCK_LOCAL 0 | |
306 | #define CM_GCR_Cx_OTHER_BLOCK_GLOBAL 1 | |
307 | #define CM_GCR_Cx_OTHER_BLOCK_USER 2 | |
308 | #define CM_GCR_Cx_OTHER_BLOCK_GLOBAL_HIGH 3 | |
309 | #define CM_GCR_Cx_OTHER_CLUSTER GENMASK(21, 16) /* CM >= 3.5 */ | |
310 | #define CM3_GCR_Cx_OTHER_CORE GENMASK(13, 8) /* CM >= 3 */ | |
311 | #define CM_GCR_Cx_OTHER_CORE_CM 32 | |
312 | #define CM3_GCR_Cx_OTHER_VP GENMASK(2, 0) /* CM >= 3 */ | |
313 | ||
314 | /* GCR_Cx_RESET_BASE - Configure where powered up cores will fetch from */ | |
315 | GCR_CX_ACCESSOR_RW(32, 0x020, reset_base) | |
316 | #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE GENMASK(31, 12) | |
317 | ||
318 | /* GCR_Cx_ID - Identify the current core */ | |
319 | GCR_CX_ACCESSOR_RO(32, 0x028, id) | |
320 | #define CM_GCR_Cx_ID_CLUSTER GENMASK(15, 8) | |
321 | #define CM_GCR_Cx_ID_CORE GENMASK(7, 0) | |
322 | ||
323 | /* GCR_Cx_RESET_EXT_BASE - Configure behaviour when cores reset or power up */ | |
324 | GCR_CX_ACCESSOR_RW(32, 0x030, reset_ext_base) | |
325 | #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET BIT(31) | |
326 | #define CM_GCR_Cx_RESET_EXT_BASE_UEB BIT(30) | |
327 | #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK GENMASK(27, 20) | |
328 | #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA GENMASK(7, 1) | |
329 | #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT BIT(0) | |
330 | ||
331 | /** | |
332 | * mips_cm_l2sync - perform an L2-only sync operation | |
333 | * | |
334 | * If an L2-only sync region is present in the system then this function | |
335 | * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV. | |
336 | */ | |
337 | static inline int mips_cm_l2sync(void) | |
338 | { | |
339 | if (!mips_cm_has_l2sync()) | |
340 | return -ENODEV; | |
341 | ||
342 | writel(0, mips_cm_l2sync_base); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | /** | |
347 | * mips_cm_revision() - return CM revision | |
348 | * | |
349 | * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The | |
350 | * return value should be checked against the CM_REV_* macros. | |
351 | */ | |
352 | static inline int mips_cm_revision(void) | |
353 | { | |
354 | if (!mips_cm_present()) | |
355 | return 0; | |
356 | ||
357 | return read_gcr_rev(); | |
358 | } | |
359 | ||
360 | /** | |
361 | * mips_cm_max_vp_width() - return the width in bits of VP indices | |
362 | * | |
363 | * Return: the width, in bits, of VP indices in fields that combine core & VP | |
364 | * indices. | |
365 | */ | |
366 | static inline unsigned int mips_cm_max_vp_width(void) | |
367 | { | |
368 | extern int smp_num_siblings; | |
369 | uint32_t cfg; | |
370 | ||
371 | if (mips_cm_revision() >= CM_REV_CM3) | |
372 | return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW; | |
373 | ||
374 | if (mips_cm_present()) { | |
375 | /* | |
376 | * We presume that all cores in the system will have the same | |
377 | * number of VP(E)s, and if that ever changes then this will | |
378 | * need revisiting. | |
379 | */ | |
380 | cfg = read_gcr_cl_config() & CM_GCR_Cx_CONFIG_PVPE; | |
381 | return (cfg >> __ffs(CM_GCR_Cx_CONFIG_PVPE)) + 1; | |
382 | } | |
383 | ||
384 | if (IS_ENABLED(CONFIG_SMP)) | |
385 | return smp_num_siblings; | |
386 | ||
387 | return 1; | |
388 | } | |
389 | ||
390 | /** | |
391 | * mips_cm_vp_id() - calculate the hardware VP ID for a CPU | |
392 | * @cpu: the CPU whose VP ID to calculate | |
393 | * | |
394 | * Hardware such as the GIC uses identifiers for VPs which may not match the | |
395 | * CPU numbers used by Linux. This function calculates the hardware VP | |
396 | * identifier corresponding to a given CPU. | |
397 | * | |
398 | * Return: the VP ID for the CPU. | |
399 | */ | |
400 | static inline unsigned int mips_cm_vp_id(unsigned int cpu) | |
401 | { | |
402 | unsigned int core = cpu_core(&cpu_data[cpu]); | |
403 | unsigned int vp = cpu_vpe_id(&cpu_data[cpu]); | |
404 | ||
405 | return (core * mips_cm_max_vp_width()) + vp; | |
406 | } | |
407 | ||
408 | #ifdef CONFIG_MIPS_CM | |
409 | ||
410 | /** | |
411 | * mips_cm_lock_other - lock access to redirect/other region | |
412 | * @cluster: the other cluster to be accessed | |
413 | * @core: the other core to be accessed | |
414 | * @vp: the VP within the other core to be accessed | |
415 | * @block: the register block to be accessed | |
416 | * | |
417 | * Configure the redirect/other region for the local core/VP (depending upon | |
418 | * the CM revision) to target the specified @cluster, @core, @vp & register | |
419 | * @block. Must be called before using the redirect/other region, and followed | |
420 | * by a call to mips_cm_unlock_other() when access to the redirect/other region | |
421 | * is complete. | |
422 | * | |
423 | * This function acquires a spinlock such that code between it & | |
424 | * mips_cm_unlock_other() calls cannot be pre-empted by anything which may | |
425 | * reconfigure the redirect/other region, and cannot be interfered with by | |
426 | * another VP in the core. As such calls to this function should not be nested. | |
427 | */ | |
428 | extern void mips_cm_lock_other(unsigned int cluster, unsigned int core, | |
429 | unsigned int vp, unsigned int block); | |
430 | ||
431 | /** | |
432 | * mips_cm_unlock_other - unlock access to redirect/other region | |
433 | * | |
434 | * Must be called after mips_cm_lock_other() once all required access to the | |
435 | * redirect/other region has been completed. | |
436 | */ | |
437 | extern void mips_cm_unlock_other(void); | |
438 | ||
439 | #else /* !CONFIG_MIPS_CM */ | |
440 | ||
441 | static inline void mips_cm_lock_other(unsigned int cluster, unsigned int core, | |
442 | unsigned int vp, unsigned int block) { } | |
443 | static inline void mips_cm_unlock_other(void) { } | |
444 | ||
445 | #endif /* !CONFIG_MIPS_CM */ | |
446 | ||
447 | /** | |
448 | * mips_cm_lock_other_cpu - lock access to redirect/other region | |
449 | * @cpu: the other CPU whose register we want to access | |
450 | * | |
451 | * Configure the redirect/other region for the local core/VP (depending upon | |
452 | * the CM revision) to target the specified @cpu & register @block. This is | |
453 | * equivalent to calling mips_cm_lock_other() but accepts a Linux CPU number | |
454 | * for convenience. | |
455 | */ | |
456 | static inline void mips_cm_lock_other_cpu(unsigned int cpu, unsigned int block) | |
457 | { | |
458 | struct cpuinfo_mips *d = &cpu_data[cpu]; | |
459 | ||
460 | mips_cm_lock_other(cpu_cluster(d), cpu_core(d), cpu_vpe_id(d), block); | |
461 | } | |
462 | ||
463 | #endif /* __MIPS_ASM_MIPS_CM_H__ */ |