1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2013 Imagination Technologies 4 * Author: Paul Burton <paul.burton@mips.com> 5 */ 6 7 #ifndef __MIPS_ASM_MIPS_CPS_H__ 8 # error Please include asm/mips-cps.h rather than asm/mips-cm.h 9 #endif 10 11 #ifndef __MIPS_ASM_MIPS_CM_H__ 12 #define __MIPS_ASM_MIPS_CM_H__ 13 14 #include <linux/bitfield.h> 15 #include <linux/bitops.h> 16 #include <linux/errno.h> 17 18 /* The base address of the CM GCR block */ 19 extern void __iomem *mips_gcr_base; 20 21 /* The base address of the CM L2-only sync region */ 22 extern void __iomem *mips_cm_l2sync_base; 23 24 /** 25 * mips_cm_phys_base - retrieve the physical base address of the CM 26 * 27 * This function returns the physical base address of the Coherence Manager 28 * global control block, or 0 if no Coherence Manager is present. It provides 29 * a default implementation which reads the CMGCRBase register where available, 30 * and may be overridden by platforms which determine this address in a 31 * different way by defining a function with the same prototype. 32 */ 33 extern phys_addr_t mips_cm_phys_base(void); 34 35 /** 36 * mips_cm_l2sync_phys_base - retrieve the physical base address of the CM 37 * L2-sync region 38 * 39 * This function returns the physical base address of the Coherence Manager 40 * L2-cache only region. It provides a default implementation which reads the 41 * CMGCRL2OnlySyncBase register where available or returns a 4K region just 42 * behind the CM GCR base address. It may be overridden by platforms which 43 * determine this address in a different way by defining a function with the 44 * same prototype. 45 */ 46 extern phys_addr_t mips_cm_l2sync_phys_base(void); 47 48 /* 49 * mips_cm_is64 - determine CM register width 50 * 51 * The CM register width is determined by the version of the CM, with CM3 52 * introducing 64 bit GCRs and all prior CM versions having 32 bit GCRs. 53 * However we may run a kernel built for MIPS32 on a system with 64 bit GCRs, 54 * or vice-versa. This variable indicates the width of the memory accesses 55 * that the kernel will perform to GCRs, which may differ from the actual 56 * width of the GCRs. 57 * 58 * It's set to 0 for 32-bit accesses and 1 for 64-bit accesses. 59 */ 60 extern int mips_cm_is64; 61 62 /** 63 * mips_cm_error_report - Report CM cache errors 64 */ 65 #ifdef CONFIG_MIPS_CM 66 extern void mips_cm_error_report(void); 67 #else 68 static inline void mips_cm_error_report(void) {} 69 #endif 70 71 /** 72 * mips_cm_probe - probe for a Coherence Manager 73 * 74 * Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM 75 * is successfully detected, else -errno. 76 */ 77 #ifdef CONFIG_MIPS_CM 78 extern int mips_cm_probe(void); 79 #else 80 static inline int mips_cm_probe(void) 81 { 82 return -ENODEV; 83 } 84 #endif 85 86 /** 87 * mips_cm_present - determine whether a Coherence Manager is present 88 * 89 * Returns true if a CM is present in the system, else false. 90 */ 91 static inline bool mips_cm_present(void) 92 { 93 #ifdef CONFIG_MIPS_CM 94 return mips_gcr_base != NULL; 95 #else 96 return false; 97 #endif 98 } 99 100 /** 101 * mips_cm_has_l2sync - determine whether an L2-only sync region is present 102 * 103 * Returns true if the system implements an L2-only sync region, else false. 104 */ 105 static inline bool mips_cm_has_l2sync(void) 106 { 107 #ifdef CONFIG_MIPS_CM 108 return mips_cm_l2sync_base != NULL; 109 #else 110 return false; 111 #endif 112 } 113 114 /* Offsets to register blocks from the CM base address */ 115 #define MIPS_CM_GCB_OFS 0x0000 /* Global Control Block */ 116 #define MIPS_CM_CLCB_OFS 0x2000 /* Core Local Control Block */ 117 #define MIPS_CM_COCB_OFS 0x4000 /* Core Other Control Block */ 118 #define MIPS_CM_GDB_OFS 0x6000 /* Global Debug Block */ 119 120 /* Total size of the CM memory mapped registers */ 121 #define MIPS_CM_GCR_SIZE 0x8000 122 123 /* Size of the L2-only sync region */ 124 #define MIPS_CM_L2SYNC_SIZE 0x1000 125 126 #define GCR_ACCESSOR_RO(sz, off, name) \ 127 CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_GCB_OFS + off, name) \ 128 CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name) 129 130 #define GCR_ACCESSOR_RW(sz, off, name) \ 131 CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_GCB_OFS + off, name) \ 132 CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name) 133 134 #define GCR_CX_ACCESSOR_RO(sz, off, name) \ 135 CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name) \ 136 CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name) 137 138 #define GCR_CX_ACCESSOR_RW(sz, off, name) \ 139 CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name) \ 140 CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name) 141 142 /* GCR_CONFIG - Information about the system */ 143 GCR_ACCESSOR_RO(64, 0x000, config) 144 #define CM_GCR_CONFIG_CLUSTER_COH_CAPABLE BIT_ULL(43) 145 #define CM_GCR_CONFIG_CLUSTER_ID GENMASK_ULL(39, 32) 146 #define CM_GCR_CONFIG_NUM_CLUSTERS GENMASK(29, 23) 147 #define CM_GCR_CONFIG_NUMIOCU GENMASK(15, 8) 148 #define CM_GCR_CONFIG_PCORES GENMASK(7, 0) 149 150 /* GCR_BASE - Base address of the Global Configuration Registers (GCRs) */ 151 GCR_ACCESSOR_RW(64, 0x008, base) 152 #define CM_GCR_BASE_GCRBASE GENMASK_ULL(47, 15) 153 #define CM_GCR_BASE_CMDEFTGT GENMASK(1, 0) 154 #define CM_GCR_BASE_CMDEFTGT_MEM 0 155 #define CM_GCR_BASE_CMDEFTGT_RESERVED 1 156 #define CM_GCR_BASE_CMDEFTGT_IOCU0 2 157 #define CM_GCR_BASE_CMDEFTGT_IOCU1 3 158 159 /* GCR_ACCESS - Controls core/IOCU access to GCRs */ 160 GCR_ACCESSOR_RW(32, 0x020, access) 161 #define CM_GCR_ACCESS_ACCESSEN GENMASK(7, 0) 162 163 /* GCR_REV - Indicates the Coherence Manager revision */ 164 GCR_ACCESSOR_RO(32, 0x030, rev) 165 #define CM_GCR_REV_MAJOR GENMASK(15, 8) 166 #define CM_GCR_REV_MINOR GENMASK(7, 0) 167 168 #define CM_ENCODE_REV(major, minor) \ 169 (FIELD_PREP(CM_GCR_REV_MAJOR, major) | \ 170 FIELD_PREP(CM_GCR_REV_MINOR, minor)) 171 172 #define CM_REV_CM2 CM_ENCODE_REV(6, 0) 173 #define CM_REV_CM2_5 CM_ENCODE_REV(7, 0) 174 #define CM_REV_CM3 CM_ENCODE_REV(8, 0) 175 #define CM_REV_CM3_5 CM_ENCODE_REV(9, 0) 176 177 /* GCR_ERR_CONTROL - Control error checking logic */ 178 GCR_ACCESSOR_RW(32, 0x038, err_control) 179 #define CM_GCR_ERR_CONTROL_L2_ECC_EN BIT(1) 180 #define CM_GCR_ERR_CONTROL_L2_ECC_SUPPORT BIT(0) 181 182 /* GCR_ERR_MASK - Control which errors are reported as interrupts */ 183 GCR_ACCESSOR_RW(64, 0x040, error_mask) 184 185 /* GCR_ERR_CAUSE - Indicates the type of error that occurred */ 186 GCR_ACCESSOR_RW(64, 0x048, error_cause) 187 #define CM_GCR_ERROR_CAUSE_ERRTYPE GENMASK(31, 27) 188 #define CM3_GCR_ERROR_CAUSE_ERRTYPE GENMASK_ULL(63, 58) 189 #define CM_GCR_ERROR_CAUSE_ERRINFO GENMASK(26, 0) 190 191 /* GCR_ERR_ADDR - Indicates the address associated with an error */ 192 GCR_ACCESSOR_RW(64, 0x050, error_addr) 193 194 /* GCR_ERR_MULT - Indicates when multiple errors have occurred */ 195 GCR_ACCESSOR_RW(64, 0x058, error_mult) 196 #define CM_GCR_ERROR_MULT_ERR2ND GENMASK(4, 0) 197 198 /* GCR_L2_ONLY_SYNC_BASE - Base address of the L2 cache-only sync region */ 199 GCR_ACCESSOR_RW(64, 0x070, l2_only_sync_base) 200 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE GENMASK(31, 12) 201 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN BIT(0) 202 203 /* GCR_GIC_BASE - Base address of the Global Interrupt Controller (GIC) */ 204 GCR_ACCESSOR_RW(64, 0x080, gic_base) 205 #define CM_GCR_GIC_BASE_GICBASE GENMASK(31, 17) 206 #define CM_GCR_GIC_BASE_GICEN BIT(0) 207 208 /* GCR_CPC_BASE - Base address of the Cluster Power Controller (CPC) */ 209 GCR_ACCESSOR_RW(64, 0x088, cpc_base) 210 #define CM_GCR_CPC_BASE_CPCBASE GENMASK(31, 15) 211 #define CM_GCR_CPC_BASE_CPCEN BIT(0) 212 213 /* GCR_REGn_BASE - Base addresses of CM address regions */ 214 GCR_ACCESSOR_RW(64, 0x090, reg0_base) 215 GCR_ACCESSOR_RW(64, 0x0a0, reg1_base) 216 GCR_ACCESSOR_RW(64, 0x0b0, reg2_base) 217 GCR_ACCESSOR_RW(64, 0x0c0, reg3_base) 218 #define CM_GCR_REGn_BASE_BASEADDR GENMASK(31, 16) 219 220 /* GCR_REGn_MASK - Size & destination of CM address regions */ 221 GCR_ACCESSOR_RW(64, 0x098, reg0_mask) 222 GCR_ACCESSOR_RW(64, 0x0a8, reg1_mask) 223 GCR_ACCESSOR_RW(64, 0x0b8, reg2_mask) 224 GCR_ACCESSOR_RW(64, 0x0c8, reg3_mask) 225 #define CM_GCR_REGn_MASK_ADDRMASK GENMASK(31, 16) 226 #define CM_GCR_REGn_MASK_CCAOVR GENMASK(7, 5) 227 #define CM_GCR_REGn_MASK_CCAOVREN BIT(4) 228 #define CM_GCR_REGn_MASK_DROPL2 BIT(2) 229 #define CM_GCR_REGn_MASK_CMTGT GENMASK(1, 0) 230 #define CM_GCR_REGn_MASK_CMTGT_DISABLED 0x0 231 #define CM_GCR_REGn_MASK_CMTGT_MEM 0x1 232 #define CM_GCR_REGn_MASK_CMTGT_IOCU0 0x2 233 #define CM_GCR_REGn_MASK_CMTGT_IOCU1 0x3 234 235 /* GCR_GIC_STATUS - Indicates presence of a Global Interrupt Controller (GIC) */ 236 GCR_ACCESSOR_RO(32, 0x0d0, gic_status) 237 #define CM_GCR_GIC_STATUS_EX BIT(0) 238 239 /* GCR_CPC_STATUS - Indicates presence of a Cluster Power Controller (CPC) */ 240 GCR_ACCESSOR_RO(32, 0x0f0, cpc_status) 241 #define CM_GCR_CPC_STATUS_EX BIT(0) 242 243 /* GCR_ACCESS - Controls core/IOCU access to GCRs */ 244 GCR_ACCESSOR_RW(32, 0x120, access_cm3) 245 #define CM_GCR_ACCESS_ACCESSEN GENMASK(7, 0) 246 247 /* GCR_L2_CONFIG - Indicates L2 cache configuration when Config5.L2C=1 */ 248 GCR_ACCESSOR_RW(32, 0x130, l2_config) 249 #define CM_GCR_L2_CONFIG_BYPASS BIT(20) 250 #define CM_GCR_L2_CONFIG_SET_SIZE GENMASK(15, 12) 251 #define CM_GCR_L2_CONFIG_LINE_SIZE GENMASK(11, 8) 252 #define CM_GCR_L2_CONFIG_ASSOC GENMASK(7, 0) 253 254 /* GCR_SYS_CONFIG2 - Further information about the system */ 255 GCR_ACCESSOR_RO(32, 0x150, sys_config2) 256 #define CM_GCR_SYS_CONFIG2_MAXVPW GENMASK(3, 0) 257 258 /* GCR_L2-RAM_CONFIG - Configuration & status of L2 cache RAMs */ 259 GCR_ACCESSOR_RW(64, 0x240, l2_ram_config) 260 #define CM_GCR_L2_RAM_CONFIG_PRESENT BIT(31) 261 #define CM_GCR_L2_RAM_CONFIG_HCI_DONE BIT(30) 262 #define CM_GCR_L2_RAM_CONFIG_HCI_SUPPORTED BIT(29) 263 264 /* GCR_L2_PFT_CONTROL - Controls hardware L2 prefetching */ 265 GCR_ACCESSOR_RW(32, 0x300, l2_pft_control) 266 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK GENMASK(31, 12) 267 #define CM_GCR_L2_PFT_CONTROL_PFTEN BIT(8) 268 #define CM_GCR_L2_PFT_CONTROL_NPFT GENMASK(7, 0) 269 270 /* GCR_L2_PFT_CONTROL_B - Controls hardware L2 prefetching */ 271 GCR_ACCESSOR_RW(32, 0x308, l2_pft_control_b) 272 #define CM_GCR_L2_PFT_CONTROL_B_CEN BIT(8) 273 #define CM_GCR_L2_PFT_CONTROL_B_PORTID GENMASK(7, 0) 274 275 /* GCR_L2_TAG_ADDR - Access addresses in L2 cache tags */ 276 GCR_ACCESSOR_RW(64, 0x600, l2_tag_addr) 277 278 /* GCR_L2_TAG_STATE - Access L2 cache tag state */ 279 GCR_ACCESSOR_RW(64, 0x608, l2_tag_state) 280 281 /* GCR_L2_DATA - Access data in L2 cache lines */ 282 GCR_ACCESSOR_RW(64, 0x610, l2_data) 283 284 /* GCR_L2_ECC - Access ECC information from L2 cache lines */ 285 GCR_ACCESSOR_RW(64, 0x618, l2_ecc) 286 287 /* GCR_L2SM_COP - L2 cache op state machine control */ 288 GCR_ACCESSOR_RW(32, 0x620, l2sm_cop) 289 #define CM_GCR_L2SM_COP_PRESENT BIT(31) 290 #define CM_GCR_L2SM_COP_RESULT GENMASK(8, 6) 291 #define CM_GCR_L2SM_COP_RESULT_DONTCARE 0 292 #define CM_GCR_L2SM_COP_RESULT_DONE_OK 1 293 #define CM_GCR_L2SM_COP_RESULT_DONE_ERROR 2 294 #define CM_GCR_L2SM_COP_RESULT_ABORT_OK 3 295 #define CM_GCR_L2SM_COP_RESULT_ABORT_ERROR 4 296 #define CM_GCR_L2SM_COP_RUNNING BIT(5) 297 #define CM_GCR_L2SM_COP_TYPE GENMASK(4, 2) 298 #define CM_GCR_L2SM_COP_TYPE_IDX_WBINV 0 299 #define CM_GCR_L2SM_COP_TYPE_IDX_STORETAG 1 300 #define CM_GCR_L2SM_COP_TYPE_IDX_STORETAGDATA 2 301 #define CM_GCR_L2SM_COP_TYPE_HIT_INV 4 302 #define CM_GCR_L2SM_COP_TYPE_HIT_WBINV 5 303 #define CM_GCR_L2SM_COP_TYPE_HIT_WB 6 304 #define CM_GCR_L2SM_COP_TYPE_FETCHLOCK 7 305 #define CM_GCR_L2SM_COP_CMD GENMASK(1, 0) 306 #define CM_GCR_L2SM_COP_CMD_START 1 /* only when idle */ 307 #define CM_GCR_L2SM_COP_CMD_ABORT 3 /* only when running */ 308 309 /* GCR_L2SM_TAG_ADDR_COP - L2 cache op state machine address control */ 310 GCR_ACCESSOR_RW(64, 0x628, l2sm_tag_addr_cop) 311 #define CM_GCR_L2SM_TAG_ADDR_COP_NUM_LINES GENMASK_ULL(63, 48) 312 #define CM_GCR_L2SM_TAG_ADDR_COP_START_TAG GENMASK_ULL(47, 6) 313 314 /* GCR_BEV_BASE - Controls the location of the BEV for powered up cores */ 315 GCR_ACCESSOR_RW(64, 0x680, bev_base) 316 317 /* GCR_Cx_RESET_RELEASE - Controls core reset for CM 1.x */ 318 GCR_CX_ACCESSOR_RW(32, 0x000, reset_release) 319 320 /* GCR_Cx_COHERENCE - Controls core coherence */ 321 GCR_CX_ACCESSOR_RW(32, 0x008, coherence) 322 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN GENMASK(7, 0) 323 #define CM3_GCR_Cx_COHERENCE_COHEN BIT(0) 324 325 /* GCR_Cx_CONFIG - Information about a core's configuration */ 326 GCR_CX_ACCESSOR_RO(32, 0x010, config) 327 #define CM_GCR_Cx_CONFIG_IOCUTYPE GENMASK(11, 10) 328 #define CM_GCR_Cx_CONFIG_PVPE GENMASK(9, 0) 329 330 /* GCR_Cx_OTHER - Configure the core-other/redirect GCR block */ 331 GCR_CX_ACCESSOR_RW(32, 0x018, other) 332 #define CM_GCR_Cx_OTHER_CORENUM GENMASK(31, 16) /* CM < 3 */ 333 #define CM_GCR_Cx_OTHER_CLUSTER_EN BIT(31) /* CM >= 3.5 */ 334 #define CM_GCR_Cx_OTHER_GIC_EN BIT(30) /* CM >= 3.5 */ 335 #define CM_GCR_Cx_OTHER_BLOCK GENMASK(25, 24) /* CM >= 3.5 */ 336 #define CM_GCR_Cx_OTHER_BLOCK_LOCAL 0 337 #define CM_GCR_Cx_OTHER_BLOCK_GLOBAL 1 338 #define CM_GCR_Cx_OTHER_BLOCK_USER 2 339 #define CM_GCR_Cx_OTHER_BLOCK_GLOBAL_HIGH 3 340 #define CM_GCR_Cx_OTHER_CLUSTER GENMASK(21, 16) /* CM >= 3.5 */ 341 #define CM3_GCR_Cx_OTHER_CORE GENMASK(13, 8) /* CM >= 3 */ 342 #define CM_GCR_Cx_OTHER_CORE_CM 32 343 #define CM3_GCR_Cx_OTHER_VP GENMASK(2, 0) /* CM >= 3 */ 344 345 /* GCR_Cx_RESET_BASE - Configure where powered up cores will fetch from */ 346 GCR_CX_ACCESSOR_RW(32, 0x020, reset_base) 347 GCR_CX_ACCESSOR_RW(64, 0x020, reset64_base) 348 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE GENMASK(31, 12) 349 #define CM_GCR_Cx_RESET64_BASE_BEVEXCBASE GENMASK_ULL(47, 12) 350 #define CM_GCR_Cx_RESET_BASE_MODE BIT(1) 351 352 /* GCR_Cx_ID - Identify the current core */ 353 GCR_CX_ACCESSOR_RO(32, 0x028, id) 354 #define CM_GCR_Cx_ID_CLUSTER GENMASK(15, 8) 355 #define CM_GCR_Cx_ID_CORE GENMASK(7, 0) 356 357 /* GCR_Cx_RESET_EXT_BASE - Configure behaviour when cores reset or power up */ 358 GCR_CX_ACCESSOR_RW(32, 0x030, reset_ext_base) 359 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET BIT(31) 360 #define CM_GCR_Cx_RESET_EXT_BASE_UEB BIT(30) 361 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK GENMASK(27, 20) 362 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA GENMASK(7, 1) 363 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT BIT(0) 364 365 /** 366 * mips_cm_l2sync - perform an L2-only sync operation 367 * 368 * If an L2-only sync region is present in the system then this function 369 * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV. 370 */ 371 static inline int mips_cm_l2sync(void) 372 { 373 if (!mips_cm_has_l2sync()) 374 return -ENODEV; 375 376 writel(0, mips_cm_l2sync_base); 377 return 0; 378 } 379 380 /** 381 * mips_cm_revision() - return CM revision 382 * 383 * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The 384 * return value should be checked against the CM_REV_* macros. 385 */ 386 static inline int mips_cm_revision(void) 387 { 388 if (!mips_cm_present()) 389 return 0; 390 391 return read_gcr_rev(); 392 } 393 394 /** 395 * mips_cm_max_vp_width() - return the width in bits of VP indices 396 * 397 * Return: the width, in bits, of VP indices in fields that combine core & VP 398 * indices. 399 */ 400 static inline unsigned int mips_cm_max_vp_width(void) 401 { 402 extern int smp_num_siblings; 403 404 if (mips_cm_revision() >= CM_REV_CM3) 405 return FIELD_GET(CM_GCR_SYS_CONFIG2_MAXVPW, 406 read_gcr_sys_config2()); 407 408 if (mips_cm_present()) { 409 /* 410 * We presume that all cores in the system will have the same 411 * number of VP(E)s, and if that ever changes then this will 412 * need revisiting. 413 */ 414 return FIELD_GET(CM_GCR_Cx_CONFIG_PVPE, read_gcr_cl_config()) + 1; 415 } 416 417 if (IS_ENABLED(CONFIG_SMP)) 418 return smp_num_siblings; 419 420 return 1; 421 } 422 423 /** 424 * mips_cm_vp_id() - calculate the hardware VP ID for a CPU 425 * @cpu: the CPU whose VP ID to calculate 426 * 427 * Hardware such as the GIC uses identifiers for VPs which may not match the 428 * CPU numbers used by Linux. This function calculates the hardware VP 429 * identifier corresponding to a given CPU. 430 * 431 * Return: the VP ID for the CPU. 432 */ 433 static inline unsigned int mips_cm_vp_id(unsigned int cpu) 434 { 435 unsigned int core = cpu_core(&cpu_data[cpu]); 436 unsigned int vp = cpu_vpe_id(&cpu_data[cpu]); 437 438 return (core * mips_cm_max_vp_width()) + vp; 439 } 440 441 #ifdef CONFIG_MIPS_CM 442 443 /** 444 * mips_cm_lock_other - lock access to redirect/other region 445 * @cluster: the other cluster to be accessed 446 * @core: the other core to be accessed 447 * @vp: the VP within the other core to be accessed 448 * @block: the register block to be accessed 449 * 450 * Configure the redirect/other region for the local core/VP (depending upon 451 * the CM revision) to target the specified @cluster, @core, @vp & register 452 * @block. Must be called before using the redirect/other region, and followed 453 * by a call to mips_cm_unlock_other() when access to the redirect/other region 454 * is complete. 455 * 456 * This function acquires a spinlock such that code between it & 457 * mips_cm_unlock_other() calls cannot be pre-empted by anything which may 458 * reconfigure the redirect/other region, and cannot be interfered with by 459 * another VP in the core. As such calls to this function should not be nested. 460 */ 461 extern void mips_cm_lock_other(unsigned int cluster, unsigned int core, 462 unsigned int vp, unsigned int block); 463 464 /** 465 * mips_cm_unlock_other - unlock access to redirect/other region 466 * 467 * Must be called after mips_cm_lock_other() once all required access to the 468 * redirect/other region has been completed. 469 */ 470 extern void mips_cm_unlock_other(void); 471 472 #else /* !CONFIG_MIPS_CM */ 473 474 static inline void mips_cm_lock_other(unsigned int cluster, unsigned int core, 475 unsigned int vp, unsigned int block) { } 476 static inline void mips_cm_unlock_other(void) { } 477 478 #endif /* !CONFIG_MIPS_CM */ 479 480 /** 481 * mips_cm_lock_other_cpu - lock access to redirect/other region 482 * @cpu: the other CPU whose register we want to access 483 * 484 * Configure the redirect/other region for the local core/VP (depending upon 485 * the CM revision) to target the specified @cpu & register @block. This is 486 * equivalent to calling mips_cm_lock_other() but accepts a Linux CPU number 487 * for convenience. 488 */ 489 static inline void mips_cm_lock_other_cpu(unsigned int cpu, unsigned int block) 490 { 491 struct cpuinfo_mips *d = &cpu_data[cpu]; 492 493 mips_cm_lock_other(cpu_cluster(d), cpu_core(d), cpu_vpe_id(d), block); 494 } 495 496 #endif /* __MIPS_ASM_MIPS_CM_H__ */ 497