1 /* 2 * Copyright (C) 2013 Imagination Technologies 3 * Author: Paul Burton <paul.burton@imgtec.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_CM_H__ 12 #define __MIPS_ASM_MIPS_CM_H__ 13 14 #include <linux/bitops.h> 15 #include <linux/errno.h> 16 #include <linux/io.h> 17 #include <linux/types.h> 18 19 /* The base address of the CM GCR block */ 20 extern void __iomem *mips_cm_base; 21 22 /* The base address of the CM L2-only sync region */ 23 extern void __iomem *mips_cm_l2sync_base; 24 25 /** 26 * __mips_cm_phys_base - retrieve the physical base address of the CM 27 * 28 * This function returns the physical base address of the Coherence Manager 29 * global control block, or 0 if no Coherence Manager is present. It provides 30 * a default implementation which reads the CMGCRBase register where available, 31 * and may be overridden by platforms which determine this address in a 32 * different way by defining a function with the same prototype except for the 33 * name mips_cm_phys_base (without underscores). 34 */ 35 extern phys_addr_t __mips_cm_phys_base(void); 36 37 /* 38 * mips_cm_is64 - determine CM register width 39 * 40 * The CM register width is determined by the version of the CM, with CM3 41 * introducing 64 bit GCRs and all prior CM versions having 32 bit GCRs. 42 * However we may run a kernel built for MIPS32 on a system with 64 bit GCRs, 43 * or vice-versa. This variable indicates the width of the memory accesses 44 * that the kernel will perform to GCRs, which may differ from the actual 45 * width of the GCRs. 46 * 47 * It's set to 0 for 32-bit accesses and 1 for 64-bit accesses. 48 */ 49 extern int mips_cm_is64; 50 51 /** 52 * mips_cm_error_report - Report CM cache errors 53 */ 54 #ifdef CONFIG_MIPS_CM 55 extern void mips_cm_error_report(void); 56 #else 57 static inline void mips_cm_error_report(void) {} 58 #endif 59 60 /** 61 * mips_cm_probe - probe for a Coherence Manager 62 * 63 * Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM 64 * is successfully detected, else -errno. 65 */ 66 #ifdef CONFIG_MIPS_CM 67 extern int mips_cm_probe(void); 68 #else 69 static inline int mips_cm_probe(void) 70 { 71 return -ENODEV; 72 } 73 #endif 74 75 /** 76 * mips_cm_present - determine whether a Coherence Manager is present 77 * 78 * Returns true if a CM is present in the system, else false. 79 */ 80 static inline bool mips_cm_present(void) 81 { 82 #ifdef CONFIG_MIPS_CM 83 return mips_cm_base != NULL; 84 #else 85 return false; 86 #endif 87 } 88 89 /** 90 * mips_cm_has_l2sync - determine whether an L2-only sync region is present 91 * 92 * Returns true if the system implements an L2-only sync region, else false. 93 */ 94 static inline bool mips_cm_has_l2sync(void) 95 { 96 #ifdef CONFIG_MIPS_CM 97 return mips_cm_l2sync_base != NULL; 98 #else 99 return false; 100 #endif 101 } 102 103 /* Offsets to register blocks from the CM base address */ 104 #define MIPS_CM_GCB_OFS 0x0000 /* Global Control Block */ 105 #define MIPS_CM_CLCB_OFS 0x2000 /* Core Local Control Block */ 106 #define MIPS_CM_COCB_OFS 0x4000 /* Core Other Control Block */ 107 #define MIPS_CM_GDB_OFS 0x6000 /* Global Debug Block */ 108 109 /* Total size of the CM memory mapped registers */ 110 #define MIPS_CM_GCR_SIZE 0x8000 111 112 /* Size of the L2-only sync region */ 113 #define MIPS_CM_L2SYNC_SIZE 0x1000 114 115 /* Macros to ease the creation of register access functions */ 116 #define BUILD_CM_R_(name, off) \ 117 static inline unsigned long __iomem *addr_gcr_##name(void) \ 118 { \ 119 return (unsigned long __iomem *)(mips_cm_base + (off)); \ 120 } \ 121 \ 122 static inline u32 read32_gcr_##name(void) \ 123 { \ 124 return __raw_readl(addr_gcr_##name()); \ 125 } \ 126 \ 127 static inline u64 read64_gcr_##name(void) \ 128 { \ 129 void __iomem *addr = addr_gcr_##name(); \ 130 u64 ret; \ 131 \ 132 if (mips_cm_is64) { \ 133 ret = __raw_readq(addr); \ 134 } else { \ 135 ret = __raw_readl(addr); \ 136 ret |= (u64)__raw_readl(addr + 0x4) << 32; \ 137 } \ 138 \ 139 return ret; \ 140 } \ 141 \ 142 static inline unsigned long read_gcr_##name(void) \ 143 { \ 144 if (mips_cm_is64) \ 145 return read64_gcr_##name(); \ 146 else \ 147 return read32_gcr_##name(); \ 148 } 149 150 #define BUILD_CM__W(name, off) \ 151 static inline void write32_gcr_##name(u32 value) \ 152 { \ 153 __raw_writel(value, addr_gcr_##name()); \ 154 } \ 155 \ 156 static inline void write64_gcr_##name(u64 value) \ 157 { \ 158 __raw_writeq(value, addr_gcr_##name()); \ 159 } \ 160 \ 161 static inline void write_gcr_##name(unsigned long value) \ 162 { \ 163 if (mips_cm_is64) \ 164 write64_gcr_##name(value); \ 165 else \ 166 write32_gcr_##name(value); \ 167 } 168 169 #define BUILD_CM_RW(name, off) \ 170 BUILD_CM_R_(name, off) \ 171 BUILD_CM__W(name, off) 172 173 #define BUILD_CM_Cx_R_(name, off) \ 174 BUILD_CM_R_(cl_##name, MIPS_CM_CLCB_OFS + (off)) \ 175 BUILD_CM_R_(co_##name, MIPS_CM_COCB_OFS + (off)) 176 177 #define BUILD_CM_Cx__W(name, off) \ 178 BUILD_CM__W(cl_##name, MIPS_CM_CLCB_OFS + (off)) \ 179 BUILD_CM__W(co_##name, MIPS_CM_COCB_OFS + (off)) 180 181 #define BUILD_CM_Cx_RW(name, off) \ 182 BUILD_CM_Cx_R_(name, off) \ 183 BUILD_CM_Cx__W(name, off) 184 185 /* GCB register accessor functions */ 186 BUILD_CM_R_(config, MIPS_CM_GCB_OFS + 0x00) 187 BUILD_CM_RW(base, MIPS_CM_GCB_OFS + 0x08) 188 BUILD_CM_RW(access, MIPS_CM_GCB_OFS + 0x20) 189 BUILD_CM_R_(rev, MIPS_CM_GCB_OFS + 0x30) 190 BUILD_CM_RW(error_mask, MIPS_CM_GCB_OFS + 0x40) 191 BUILD_CM_RW(error_cause, MIPS_CM_GCB_OFS + 0x48) 192 BUILD_CM_RW(error_addr, MIPS_CM_GCB_OFS + 0x50) 193 BUILD_CM_RW(error_mult, MIPS_CM_GCB_OFS + 0x58) 194 BUILD_CM_RW(l2_only_sync_base, MIPS_CM_GCB_OFS + 0x70) 195 BUILD_CM_RW(gic_base, MIPS_CM_GCB_OFS + 0x80) 196 BUILD_CM_RW(cpc_base, MIPS_CM_GCB_OFS + 0x88) 197 BUILD_CM_RW(reg0_base, MIPS_CM_GCB_OFS + 0x90) 198 BUILD_CM_RW(reg0_mask, MIPS_CM_GCB_OFS + 0x98) 199 BUILD_CM_RW(reg1_base, MIPS_CM_GCB_OFS + 0xa0) 200 BUILD_CM_RW(reg1_mask, MIPS_CM_GCB_OFS + 0xa8) 201 BUILD_CM_RW(reg2_base, MIPS_CM_GCB_OFS + 0xb0) 202 BUILD_CM_RW(reg2_mask, MIPS_CM_GCB_OFS + 0xb8) 203 BUILD_CM_RW(reg3_base, MIPS_CM_GCB_OFS + 0xc0) 204 BUILD_CM_RW(reg3_mask, MIPS_CM_GCB_OFS + 0xc8) 205 BUILD_CM_R_(gic_status, MIPS_CM_GCB_OFS + 0xd0) 206 BUILD_CM_R_(cpc_status, MIPS_CM_GCB_OFS + 0xf0) 207 BUILD_CM_RW(l2_config, MIPS_CM_GCB_OFS + 0x130) 208 BUILD_CM_RW(sys_config2, MIPS_CM_GCB_OFS + 0x150) 209 BUILD_CM_RW(l2_pft_control, MIPS_CM_GCB_OFS + 0x300) 210 BUILD_CM_RW(l2_pft_control_b, MIPS_CM_GCB_OFS + 0x308) 211 BUILD_CM_RW(bev_base, MIPS_CM_GCB_OFS + 0x680) 212 213 /* Core Local & Core Other register accessor functions */ 214 BUILD_CM_Cx_RW(reset_release, 0x00) 215 BUILD_CM_Cx_RW(coherence, 0x08) 216 BUILD_CM_Cx_R_(config, 0x10) 217 BUILD_CM_Cx_RW(other, 0x18) 218 BUILD_CM_Cx_RW(reset_base, 0x20) 219 BUILD_CM_Cx_R_(id, 0x28) 220 BUILD_CM_Cx_RW(reset_ext_base, 0x30) 221 BUILD_CM_Cx_R_(tcid_0_priority, 0x40) 222 BUILD_CM_Cx_R_(tcid_1_priority, 0x48) 223 BUILD_CM_Cx_R_(tcid_2_priority, 0x50) 224 BUILD_CM_Cx_R_(tcid_3_priority, 0x58) 225 BUILD_CM_Cx_R_(tcid_4_priority, 0x60) 226 BUILD_CM_Cx_R_(tcid_5_priority, 0x68) 227 BUILD_CM_Cx_R_(tcid_6_priority, 0x70) 228 BUILD_CM_Cx_R_(tcid_7_priority, 0x78) 229 BUILD_CM_Cx_R_(tcid_8_priority, 0x80) 230 231 /* GCR_CONFIG register fields */ 232 #define CM_GCR_CONFIG_NUMIOCU_SHF 8 233 #define CM_GCR_CONFIG_NUMIOCU_MSK (_ULCAST_(0xf) << 8) 234 #define CM_GCR_CONFIG_PCORES_SHF 0 235 #define CM_GCR_CONFIG_PCORES_MSK (_ULCAST_(0xff) << 0) 236 237 /* GCR_BASE register fields */ 238 #define CM_GCR_BASE_GCRBASE_SHF 15 239 #define CM_GCR_BASE_GCRBASE_MSK (_ULCAST_(0x1ffff) << 15) 240 #define CM_GCR_BASE_CMDEFTGT_SHF 0 241 #define CM_GCR_BASE_CMDEFTGT_MSK (_ULCAST_(0x3) << 0) 242 #define CM_GCR_BASE_CMDEFTGT_DISABLED 0 243 #define CM_GCR_BASE_CMDEFTGT_MEM 1 244 #define CM_GCR_BASE_CMDEFTGT_IOCU0 2 245 #define CM_GCR_BASE_CMDEFTGT_IOCU1 3 246 247 /* GCR_RESET_EXT_BASE register fields */ 248 #define CM_GCR_RESET_EXT_BASE_EVARESET BIT(31) 249 #define CM_GCR_RESET_EXT_BASE_UEB BIT(30) 250 251 /* GCR_ACCESS register fields */ 252 #define CM_GCR_ACCESS_ACCESSEN_SHF 0 253 #define CM_GCR_ACCESS_ACCESSEN_MSK (_ULCAST_(0xff) << 0) 254 255 /* GCR_REV register fields */ 256 #define CM_GCR_REV_MAJOR_SHF 8 257 #define CM_GCR_REV_MAJOR_MSK (_ULCAST_(0xff) << 8) 258 #define CM_GCR_REV_MINOR_SHF 0 259 #define CM_GCR_REV_MINOR_MSK (_ULCAST_(0xff) << 0) 260 261 #define CM_ENCODE_REV(major, minor) \ 262 (((major) << CM_GCR_REV_MAJOR_SHF) | \ 263 ((minor) << CM_GCR_REV_MINOR_SHF)) 264 265 #define CM_REV_CM2 CM_ENCODE_REV(6, 0) 266 #define CM_REV_CM2_5 CM_ENCODE_REV(7, 0) 267 #define CM_REV_CM3 CM_ENCODE_REV(8, 0) 268 269 /* GCR_ERROR_CAUSE register fields */ 270 #define CM_GCR_ERROR_CAUSE_ERRTYPE_SHF 27 271 #define CM_GCR_ERROR_CAUSE_ERRTYPE_MSK (_ULCAST_(0x1f) << 27) 272 #define CM3_GCR_ERROR_CAUSE_ERRTYPE_SHF 58 273 #define CM3_GCR_ERROR_CAUSE_ERRTYPE_MSK GENMASK_ULL(63, 58) 274 #define CM_GCR_ERROR_CAUSE_ERRINFO_SHF 0 275 #define CM_GCR_ERROR_CAUSE_ERRINGO_MSK (_ULCAST_(0x7ffffff) << 0) 276 277 /* GCR_ERROR_MULT register fields */ 278 #define CM_GCR_ERROR_MULT_ERR2ND_SHF 0 279 #define CM_GCR_ERROR_MULT_ERR2ND_MSK (_ULCAST_(0x1f) << 0) 280 281 /* GCR_L2_ONLY_SYNC_BASE register fields */ 282 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_SHF 12 283 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK (_ULCAST_(0xfffff) << 12) 284 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_SHF 0 285 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK (_ULCAST_(0x1) << 0) 286 287 /* GCR_GIC_BASE register fields */ 288 #define CM_GCR_GIC_BASE_GICBASE_SHF 17 289 #define CM_GCR_GIC_BASE_GICBASE_MSK (_ULCAST_(0x7fff) << 17) 290 #define CM_GCR_GIC_BASE_GICEN_SHF 0 291 #define CM_GCR_GIC_BASE_GICEN_MSK (_ULCAST_(0x1) << 0) 292 293 /* GCR_CPC_BASE register fields */ 294 #define CM_GCR_CPC_BASE_CPCBASE_SHF 15 295 #define CM_GCR_CPC_BASE_CPCBASE_MSK (_ULCAST_(0x1ffff) << 15) 296 #define CM_GCR_CPC_BASE_CPCEN_SHF 0 297 #define CM_GCR_CPC_BASE_CPCEN_MSK (_ULCAST_(0x1) << 0) 298 299 /* GCR_GIC_STATUS register fields */ 300 #define CM_GCR_GIC_STATUS_GICEX_SHF 0 301 #define CM_GCR_GIC_STATUS_GICEX_MSK (_ULCAST_(0x1) << 0) 302 303 /* GCR_REGn_BASE register fields */ 304 #define CM_GCR_REGn_BASE_BASEADDR_SHF 16 305 #define CM_GCR_REGn_BASE_BASEADDR_MSK (_ULCAST_(0xffff) << 16) 306 307 /* GCR_REGn_MASK register fields */ 308 #define CM_GCR_REGn_MASK_ADDRMASK_SHF 16 309 #define CM_GCR_REGn_MASK_ADDRMASK_MSK (_ULCAST_(0xffff) << 16) 310 #define CM_GCR_REGn_MASK_CCAOVR_SHF 5 311 #define CM_GCR_REGn_MASK_CCAOVR_MSK (_ULCAST_(0x3) << 5) 312 #define CM_GCR_REGn_MASK_CCAOVREN_SHF 4 313 #define CM_GCR_REGn_MASK_CCAOVREN_MSK (_ULCAST_(0x1) << 4) 314 #define CM_GCR_REGn_MASK_DROPL2_SHF 2 315 #define CM_GCR_REGn_MASK_DROPL2_MSK (_ULCAST_(0x1) << 2) 316 #define CM_GCR_REGn_MASK_CMTGT_SHF 0 317 #define CM_GCR_REGn_MASK_CMTGT_MSK (_ULCAST_(0x3) << 0) 318 #define CM_GCR_REGn_MASK_CMTGT_DISABLED (_ULCAST_(0x0) << 0) 319 #define CM_GCR_REGn_MASK_CMTGT_MEM (_ULCAST_(0x1) << 0) 320 #define CM_GCR_REGn_MASK_CMTGT_IOCU0 (_ULCAST_(0x2) << 0) 321 #define CM_GCR_REGn_MASK_CMTGT_IOCU1 (_ULCAST_(0x3) << 0) 322 323 /* GCR_GIC_STATUS register fields */ 324 #define CM_GCR_GIC_STATUS_EX_SHF 0 325 #define CM_GCR_GIC_STATUS_EX_MSK (_ULCAST_(0x1) << 0) 326 327 /* GCR_CPC_STATUS register fields */ 328 #define CM_GCR_CPC_STATUS_EX_SHF 0 329 #define CM_GCR_CPC_STATUS_EX_MSK (_ULCAST_(0x1) << 0) 330 331 /* GCR_L2_CONFIG register fields */ 332 #define CM_GCR_L2_CONFIG_BYPASS_SHF 20 333 #define CM_GCR_L2_CONFIG_BYPASS_MSK (_ULCAST_(0x1) << 20) 334 #define CM_GCR_L2_CONFIG_SET_SIZE_SHF 12 335 #define CM_GCR_L2_CONFIG_SET_SIZE_MSK (_ULCAST_(0xf) << 12) 336 #define CM_GCR_L2_CONFIG_LINE_SIZE_SHF 8 337 #define CM_GCR_L2_CONFIG_LINE_SIZE_MSK (_ULCAST_(0xf) << 8) 338 #define CM_GCR_L2_CONFIG_ASSOC_SHF 0 339 #define CM_GCR_L2_CONFIG_ASSOC_MSK (_ULCAST_(0xff) << 0) 340 341 /* GCR_SYS_CONFIG2 register fields */ 342 #define CM_GCR_SYS_CONFIG2_MAXVPW_SHF 0 343 #define CM_GCR_SYS_CONFIG2_MAXVPW_MSK (_ULCAST_(0xf) << 0) 344 345 /* GCR_L2_PFT_CONTROL register fields */ 346 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK_SHF 12 347 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK_MSK (_ULCAST_(0xfffff) << 12) 348 #define CM_GCR_L2_PFT_CONTROL_PFTEN_SHF 8 349 #define CM_GCR_L2_PFT_CONTROL_PFTEN_MSK (_ULCAST_(0x1) << 8) 350 #define CM_GCR_L2_PFT_CONTROL_NPFT_SHF 0 351 #define CM_GCR_L2_PFT_CONTROL_NPFT_MSK (_ULCAST_(0xff) << 0) 352 353 /* GCR_L2_PFT_CONTROL_B register fields */ 354 #define CM_GCR_L2_PFT_CONTROL_B_CEN_SHF 8 355 #define CM_GCR_L2_PFT_CONTROL_B_CEN_MSK (_ULCAST_(0x1) << 8) 356 #define CM_GCR_L2_PFT_CONTROL_B_PORTID_SHF 0 357 #define CM_GCR_L2_PFT_CONTROL_B_PORTID_MSK (_ULCAST_(0xff) << 0) 358 359 /* GCR_Cx_COHERENCE register fields */ 360 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN_SHF 0 361 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK (_ULCAST_(0xff) << 0) 362 #define CM3_GCR_Cx_COHERENCE_COHEN_MSK (_ULCAST_(0x1) << 0) 363 364 /* GCR_Cx_CONFIG register fields */ 365 #define CM_GCR_Cx_CONFIG_IOCUTYPE_SHF 10 366 #define CM_GCR_Cx_CONFIG_IOCUTYPE_MSK (_ULCAST_(0x3) << 10) 367 #define CM_GCR_Cx_CONFIG_PVPE_SHF 0 368 #define CM_GCR_Cx_CONFIG_PVPE_MSK (_ULCAST_(0x3ff) << 0) 369 370 /* GCR_Cx_OTHER register fields */ 371 #define CM_GCR_Cx_OTHER_CORENUM_SHF 16 372 #define CM_GCR_Cx_OTHER_CORENUM_MSK (_ULCAST_(0xffff) << 16) 373 #define CM3_GCR_Cx_OTHER_CORE_SHF 8 374 #define CM3_GCR_Cx_OTHER_CORE_MSK (_ULCAST_(0x3f) << 8) 375 #define CM3_GCR_Cx_OTHER_VP_SHF 0 376 #define CM3_GCR_Cx_OTHER_VP_MSK (_ULCAST_(0x7) << 0) 377 378 /* GCR_Cx_RESET_BASE register fields */ 379 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_SHF 12 380 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_MSK (_ULCAST_(0xfffff) << 12) 381 382 /* GCR_Cx_RESET_EXT_BASE register fields */ 383 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_SHF 31 384 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_MSK (_ULCAST_(0x1) << 31) 385 #define CM_GCR_Cx_RESET_EXT_BASE_UEB_SHF 30 386 #define CM_GCR_Cx_RESET_EXT_BASE_UEB_MSK (_ULCAST_(0x1) << 30) 387 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_SHF 20 388 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_MSK (_ULCAST_(0xff) << 20) 389 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_SHF 1 390 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_MSK (_ULCAST_(0x7f) << 1) 391 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_SHF 0 392 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_MSK (_ULCAST_(0x1) << 0) 393 394 /** 395 * mips_cm_numcores - return the number of cores present in the system 396 * 397 * Returns the value of the PCORES field of the GCR_CONFIG register plus 1, or 398 * zero if no Coherence Manager is present. 399 */ 400 static inline unsigned mips_cm_numcores(void) 401 { 402 if (!mips_cm_present()) 403 return 0; 404 405 return ((read_gcr_config() & CM_GCR_CONFIG_PCORES_MSK) 406 >> CM_GCR_CONFIG_PCORES_SHF) + 1; 407 } 408 409 /** 410 * mips_cm_numiocu - return the number of IOCUs present in the system 411 * 412 * Returns the value of the NUMIOCU field of the GCR_CONFIG register, or zero 413 * if no Coherence Manager is present. 414 */ 415 static inline unsigned mips_cm_numiocu(void) 416 { 417 if (!mips_cm_present()) 418 return 0; 419 420 return (read_gcr_config() & CM_GCR_CONFIG_NUMIOCU_MSK) 421 >> CM_GCR_CONFIG_NUMIOCU_SHF; 422 } 423 424 /** 425 * mips_cm_l2sync - perform an L2-only sync operation 426 * 427 * If an L2-only sync region is present in the system then this function 428 * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV. 429 */ 430 static inline int mips_cm_l2sync(void) 431 { 432 if (!mips_cm_has_l2sync()) 433 return -ENODEV; 434 435 writel(0, mips_cm_l2sync_base); 436 return 0; 437 } 438 439 /** 440 * mips_cm_revision() - return CM revision 441 * 442 * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The 443 * return value should be checked against the CM_REV_* macros. 444 */ 445 static inline int mips_cm_revision(void) 446 { 447 if (!mips_cm_present()) 448 return 0; 449 450 return read_gcr_rev(); 451 } 452 453 /** 454 * mips_cm_max_vp_width() - return the width in bits of VP indices 455 * 456 * Return: the width, in bits, of VP indices in fields that combine core & VP 457 * indices. 458 */ 459 static inline unsigned int mips_cm_max_vp_width(void) 460 { 461 extern int smp_num_siblings; 462 uint32_t cfg; 463 464 if (mips_cm_revision() >= CM_REV_CM3) 465 return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW_MSK; 466 467 if (mips_cm_present()) { 468 /* 469 * We presume that all cores in the system will have the same 470 * number of VP(E)s, and if that ever changes then this will 471 * need revisiting. 472 */ 473 cfg = read_gcr_cl_config() & CM_GCR_Cx_CONFIG_PVPE_MSK; 474 return (cfg >> CM_GCR_Cx_CONFIG_PVPE_SHF) + 1; 475 } 476 477 if (IS_ENABLED(CONFIG_SMP)) 478 return smp_num_siblings; 479 480 return 1; 481 } 482 483 /** 484 * mips_cm_vp_id() - calculate the hardware VP ID for a CPU 485 * @cpu: the CPU whose VP ID to calculate 486 * 487 * Hardware such as the GIC uses identifiers for VPs which may not match the 488 * CPU numbers used by Linux. This function calculates the hardware VP 489 * identifier corresponding to a given CPU. 490 * 491 * Return: the VP ID for the CPU. 492 */ 493 static inline unsigned int mips_cm_vp_id(unsigned int cpu) 494 { 495 unsigned int core = cpu_data[cpu].core; 496 unsigned int vp = cpu_vpe_id(&cpu_data[cpu]); 497 498 return (core * mips_cm_max_vp_width()) + vp; 499 } 500 501 #ifdef CONFIG_MIPS_CM 502 503 /** 504 * mips_cm_lock_other - lock access to another core 505 * @core: the other core to be accessed 506 * @vp: the VP within the other core to be accessed 507 * 508 * Call before operating upon a core via the 'other' register region in 509 * order to prevent the region being moved during access. Must be followed 510 * by a call to mips_cm_unlock_other. 511 */ 512 extern void mips_cm_lock_other(unsigned int core, unsigned int vp); 513 514 /** 515 * mips_cm_unlock_other - unlock access to another core 516 * 517 * Call after operating upon another core via the 'other' register region. 518 * Must be called after mips_cm_lock_other. 519 */ 520 extern void mips_cm_unlock_other(void); 521 522 #else /* !CONFIG_MIPS_CM */ 523 524 static inline void mips_cm_lock_other(unsigned int core, unsigned int vp) { } 525 static inline void mips_cm_unlock_other(void) { } 526 527 #endif /* !CONFIG_MIPS_CM */ 528 529 #endif /* __MIPS_ASM_MIPS_CM_H__ */ 530