arch/mips/include/asm/mips-cm.h

   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/errno.h>
  15 #include <linux/io.h>
  16 #include <linux/types.h>
  17
  18 /* The base address of the CM GCR block */
  19 extern void __iomem *mips_cm_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 overriden by platforms which determine this address in a
  31  * different way by defining a function with the same prototype except for the
  32  * name mips_cm_phys_base (without underscores).
  33  */
  34 extern phys_addr_t __mips_cm_phys_base(void);
  35
  36 /*
  37  * mips_cm_is64 - determine CM register width
  38  *
  39  * The CM register width is processor and CM specific. A 64-bit processor
  40  * usually has a 64-bit CM and a 32-bit one has a 32-bit CM but a 64-bit
  41  * processor could come with a 32-bit CM. Moreover, accesses on 64-bit CMs
  42  * can be done either using regular 64-bit load/store instructions, or 32-bit
  43  * load/store instruction on 32-bit register pairs. We opt for using 64-bit
  44  * accesses on 64-bit CMs and kernels and 32-bit in any other case.
  45  *
  46  * It's set to 0 for 32-bit accesses and 1 for 64-bit accesses.
  47  */
  48 extern int mips_cm_is64;
  49
  50 /**
  51  * mips_cm_error_report - Report CM cache errors
  52  */
  53 #ifdef CONFIG_MIPS_CM
  54 extern void mips_cm_error_report(void);
  55 #else
  56 static inline void mips_cm_error_report(void) {}
  57 #endif
  58
  59 /**
  60  * mips_cm_probe - probe for a Coherence Manager
  61  *
  62  * Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM
  63  * is successfully detected, else -errno.
  64  */
  65 #ifdef CONFIG_MIPS_CM
  66 extern int mips_cm_probe(void);
  67 #else
  68 static inline int mips_cm_probe(void)
  69 {
  70         return -ENODEV;
  71 }
  72 #endif
  73
  74 /**
  75  * mips_cm_present - determine whether a Coherence Manager is present
  76  *
  77  * Returns true if a CM is present in the system, else false.
  78  */
  79 static inline bool mips_cm_present(void)
  80 {
  81 #ifdef CONFIG_MIPS_CM
  82         return mips_cm_base != NULL;
  83 #else
  84         return false;
  85 #endif
  86 }
  87
  88 /**
  89  * mips_cm_has_l2sync - determine whether an L2-only sync region is present
  90  *
  91  * Returns true if the system implements an L2-only sync region, else false.
  92  */
  93 static inline bool mips_cm_has_l2sync(void)
  94 {
  95 #ifdef CONFIG_MIPS_CM
  96         return mips_cm_l2sync_base != NULL;
  97 #else
  98         return false;
  99 #endif
 100 }
 101
 102 /* Offsets to register blocks from the CM base address */
 103 #define MIPS_CM_GCB_OFS         0x0000 /* Global Control Block */
 104 #define MIPS_CM_CLCB_OFS        0x2000 /* Core Local Control Block */
 105 #define MIPS_CM_COCB_OFS        0x4000 /* Core Other Control Block */
 106 #define MIPS_CM_GDB_OFS         0x6000 /* Global Debug Block */
 107
 108 /* Total size of the CM memory mapped registers */
 109 #define MIPS_CM_GCR_SIZE        0x8000
 110
 111 /* Size of the L2-only sync region */
 112 #define MIPS_CM_L2SYNC_SIZE     0x1000
 113
 114 /* Macros to ease the creation of register access functions */
 115 #define BUILD_CM_R_(name, off)                                  \
 116 static inline unsigned long __iomem *addr_gcr_##name(void)      \
 117 {                                                               \
 118         return (unsigned long __iomem *)(mips_cm_base + (off)); \
 119 }                                                               \
 120                                                                 \
 121 static inline u32 read32_gcr_##name(void)                       \
 122 {                                                               \
 123         return __raw_readl(addr_gcr_##name());                  \
 124 }                                                               \
 125                                                                 \
 126 static inline u64 read64_gcr_##name(void)                       \
 127 {                                                               \
 128         return __raw_readq(addr_gcr_##name());                  \
 129 }                                                               \
 130                                                                 \
 131 static inline unsigned long read_gcr_##name(void)               \
 132 {                                                               \
 133         if (mips_cm_is64)                                       \
 134                 return read64_gcr_##name();                     \
 135         else                                                    \
 136                 return read32_gcr_##name();                     \
 137 }
 138
 139 #define BUILD_CM__W(name, off)                                  \
 140 static inline void write32_gcr_##name(u32 value)                \
 141 {                                                               \
 142         __raw_writel(value, addr_gcr_##name());                 \
 143 }                                                               \
 144                                                                 \
 145 static inline void write64_gcr_##name(u64 value)                \
 146 {                                                               \
 147         __raw_writeq(value, addr_gcr_##name());                 \
 148 }                                                               \
 149                                                                 \
 150 static inline void write_gcr_##name(unsigned long value)        \
 151 {                                                               \
 152         if (mips_cm_is64)                                       \
 153                 write64_gcr_##name(value);                      \
 154         else                                                    \
 155                 write32_gcr_##name(value);                      \
 156 }
 157
 158 #define BUILD_CM_RW(name, off)                                  \
 159         BUILD_CM_R_(name, off)                                  \
 160         BUILD_CM__W(name, off)
 161
 162 #define BUILD_CM_Cx_R_(name, off)                               \
 163         BUILD_CM_R_(cl_##name, MIPS_CM_CLCB_OFS + (off))        \
 164         BUILD_CM_R_(co_##name, MIPS_CM_COCB_OFS + (off))
 165
 166 #define BUILD_CM_Cx__W(name, off)                               \
 167         BUILD_CM__W(cl_##name, MIPS_CM_CLCB_OFS + (off))        \
 168         BUILD_CM__W(co_##name, MIPS_CM_COCB_OFS + (off))
 169
 170 #define BUILD_CM_Cx_RW(name, off)                               \
 171         BUILD_CM_Cx_R_(name, off)                               \
 172         BUILD_CM_Cx__W(name, off)
 173
 174 /* GCB register accessor functions */
 175 BUILD_CM_R_(config,             MIPS_CM_GCB_OFS + 0x00)
 176 BUILD_CM_RW(base,               MIPS_CM_GCB_OFS + 0x08)
 177 BUILD_CM_RW(access,             MIPS_CM_GCB_OFS + 0x20)
 178 BUILD_CM_R_(rev,                MIPS_CM_GCB_OFS + 0x30)
 179 BUILD_CM_RW(error_mask,         MIPS_CM_GCB_OFS + 0x40)
 180 BUILD_CM_RW(error_cause,        MIPS_CM_GCB_OFS + 0x48)
 181 BUILD_CM_RW(error_addr,         MIPS_CM_GCB_OFS + 0x50)
 182 BUILD_CM_RW(error_mult,         MIPS_CM_GCB_OFS + 0x58)
 183 BUILD_CM_RW(l2_only_sync_base,  MIPS_CM_GCB_OFS + 0x70)
 184 BUILD_CM_RW(gic_base,           MIPS_CM_GCB_OFS + 0x80)
 185 BUILD_CM_RW(cpc_base,           MIPS_CM_GCB_OFS + 0x88)
 186 BUILD_CM_RW(reg0_base,          MIPS_CM_GCB_OFS + 0x90)
 187 BUILD_CM_RW(reg0_mask,          MIPS_CM_GCB_OFS + 0x98)
 188 BUILD_CM_RW(reg1_base,          MIPS_CM_GCB_OFS + 0xa0)
 189 BUILD_CM_RW(reg1_mask,          MIPS_CM_GCB_OFS + 0xa8)
 190 BUILD_CM_RW(reg2_base,          MIPS_CM_GCB_OFS + 0xb0)
 191 BUILD_CM_RW(reg2_mask,          MIPS_CM_GCB_OFS + 0xb8)
 192 BUILD_CM_RW(reg3_base,          MIPS_CM_GCB_OFS + 0xc0)
 193 BUILD_CM_RW(reg3_mask,          MIPS_CM_GCB_OFS + 0xc8)
 194 BUILD_CM_R_(gic_status,         MIPS_CM_GCB_OFS + 0xd0)
 195 BUILD_CM_R_(cpc_status,         MIPS_CM_GCB_OFS + 0xf0)
 196 BUILD_CM_RW(l2_config,          MIPS_CM_GCB_OFS + 0x130)
 197 BUILD_CM_RW(sys_config2,        MIPS_CM_GCB_OFS + 0x150)
 198 BUILD_CM_RW(l2_pft_control,     MIPS_CM_GCB_OFS + 0x300)
 199 BUILD_CM_RW(l2_pft_control_b,   MIPS_CM_GCB_OFS + 0x308)
 200
 201 /* Core Local & Core Other register accessor functions */
 202 BUILD_CM_Cx_RW(reset_release,   0x00)
 203 BUILD_CM_Cx_RW(coherence,       0x08)
 204 BUILD_CM_Cx_R_(config,          0x10)
 205 BUILD_CM_Cx_RW(other,           0x18)
 206 BUILD_CM_Cx_RW(reset_base,      0x20)
 207 BUILD_CM_Cx_R_(id,              0x28)
 208 BUILD_CM_Cx_RW(reset_ext_base,  0x30)
 209 BUILD_CM_Cx_R_(tcid_0_priority, 0x40)
 210 BUILD_CM_Cx_R_(tcid_1_priority, 0x48)
 211 BUILD_CM_Cx_R_(tcid_2_priority, 0x50)
 212 BUILD_CM_Cx_R_(tcid_3_priority, 0x58)
 213 BUILD_CM_Cx_R_(tcid_4_priority, 0x60)
 214 BUILD_CM_Cx_R_(tcid_5_priority, 0x68)
 215 BUILD_CM_Cx_R_(tcid_6_priority, 0x70)
 216 BUILD_CM_Cx_R_(tcid_7_priority, 0x78)
 217 BUILD_CM_Cx_R_(tcid_8_priority, 0x80)
 218
 219 /* GCR_CONFIG register fields */
 220 #define CM_GCR_CONFIG_NUMIOCU_SHF               8
 221 #define CM_GCR_CONFIG_NUMIOCU_MSK               (_ULCAST_(0xf) << 8)
 222 #define CM_GCR_CONFIG_PCORES_SHF                0
 223 #define CM_GCR_CONFIG_PCORES_MSK                (_ULCAST_(0xff) << 0)
 224
 225 /* GCR_BASE register fields */
 226 #define CM_GCR_BASE_GCRBASE_SHF                 15
 227 #define CM_GCR_BASE_GCRBASE_MSK                 (_ULCAST_(0x1ffff) << 15)
 228 #define CM_GCR_BASE_CMDEFTGT_SHF                0
 229 #define CM_GCR_BASE_CMDEFTGT_MSK                (_ULCAST_(0x3) << 0)
 230 #define  CM_GCR_BASE_CMDEFTGT_DISABLED          0
 231 #define  CM_GCR_BASE_CMDEFTGT_MEM               1
 232 #define  CM_GCR_BASE_CMDEFTGT_IOCU0             2
 233 #define  CM_GCR_BASE_CMDEFTGT_IOCU1             3
 234
 235 /* GCR_ACCESS register fields */
 236 #define CM_GCR_ACCESS_ACCESSEN_SHF              0
 237 #define CM_GCR_ACCESS_ACCESSEN_MSK              (_ULCAST_(0xff) << 0)
 238
 239 /* GCR_REV register fields */
 240 #define CM_GCR_REV_MAJOR_SHF                    8
 241 #define CM_GCR_REV_MAJOR_MSK                    (_ULCAST_(0xff) << 8)
 242 #define CM_GCR_REV_MINOR_SHF                    0
 243 #define CM_GCR_REV_MINOR_MSK                    (_ULCAST_(0xff) << 0)
 244
 245 #define CM_ENCODE_REV(major, minor) \
 246                 (((major) << CM_GCR_REV_MAJOR_SHF) | \
 247                  ((minor) << CM_GCR_REV_MINOR_SHF))
 248
 249 #define CM_REV_CM2                              CM_ENCODE_REV(6, 0)
 250 #define CM_REV_CM2_5                            CM_ENCODE_REV(7, 0)
 251 #define CM_REV_CM3                              CM_ENCODE_REV(8, 0)
 252
 253 /* GCR_ERROR_CAUSE register fields */
 254 #define CM_GCR_ERROR_CAUSE_ERRTYPE_SHF          27
 255 #define CM_GCR_ERROR_CAUSE_ERRTYPE_MSK          (_ULCAST_(0x1f) << 27)
 256 #define CM_GCR_ERROR_CAUSE_ERRINFO_SHF          0
 257 #define CM_GCR_ERROR_CAUSE_ERRINGO_MSK          (_ULCAST_(0x7ffffff) << 0)
 258
 259 /* GCR_ERROR_MULT register fields */
 260 #define CM_GCR_ERROR_MULT_ERR2ND_SHF            0
 261 #define CM_GCR_ERROR_MULT_ERR2ND_MSK            (_ULCAST_(0x1f) << 0)
 262
 263 /* GCR_L2_ONLY_SYNC_BASE register fields */
 264 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_SHF   12
 265 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK   (_ULCAST_(0xfffff) << 12)
 266 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_SHF     0
 267 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK     (_ULCAST_(0x1) << 0)
 268
 269 /* GCR_GIC_BASE register fields */
 270 #define CM_GCR_GIC_BASE_GICBASE_SHF             17
 271 #define CM_GCR_GIC_BASE_GICBASE_MSK             (_ULCAST_(0x7fff) << 17)
 272 #define CM_GCR_GIC_BASE_GICEN_SHF               0
 273 #define CM_GCR_GIC_BASE_GICEN_MSK               (_ULCAST_(0x1) << 0)
 274
 275 /* GCR_CPC_BASE register fields */
 276 #define CM_GCR_CPC_BASE_CPCBASE_SHF             17
 277 #define CM_GCR_CPC_BASE_CPCBASE_MSK             (_ULCAST_(0x7fff) << 17)
 278 #define CM_GCR_CPC_BASE_CPCEN_SHF               0
 279 #define CM_GCR_CPC_BASE_CPCEN_MSK               (_ULCAST_(0x1) << 0)
 280
 281 /* GCR_GIC_STATUS register fields */
 282 #define CM_GCR_GIC_STATUS_GICEX_SHF             0
 283 #define CM_GCR_GIC_STATUS_GICEX_MSK             (_ULCAST_(0x1) << 0)
 284
 285 /* GCR_REGn_BASE register fields */
 286 #define CM_GCR_REGn_BASE_BASEADDR_SHF           16
 287 #define CM_GCR_REGn_BASE_BASEADDR_MSK           (_ULCAST_(0xffff) << 16)
 288
 289 /* GCR_REGn_MASK register fields */
 290 #define CM_GCR_REGn_MASK_ADDRMASK_SHF           16
 291 #define CM_GCR_REGn_MASK_ADDRMASK_MSK           (_ULCAST_(0xffff) << 16)
 292 #define CM_GCR_REGn_MASK_CCAOVR_SHF             5
 293 #define CM_GCR_REGn_MASK_CCAOVR_MSK             (_ULCAST_(0x3) << 5)
 294 #define CM_GCR_REGn_MASK_CCAOVREN_SHF           4
 295 #define CM_GCR_REGn_MASK_CCAOVREN_MSK           (_ULCAST_(0x1) << 4)
 296 #define CM_GCR_REGn_MASK_DROPL2_SHF             2
 297 #define CM_GCR_REGn_MASK_DROPL2_MSK             (_ULCAST_(0x1) << 2)
 298 #define CM_GCR_REGn_MASK_CMTGT_SHF              0
 299 #define CM_GCR_REGn_MASK_CMTGT_MSK              (_ULCAST_(0x3) << 0)
 300 #define  CM_GCR_REGn_MASK_CMTGT_DISABLED        (_ULCAST_(0x0) << 0)
 301 #define  CM_GCR_REGn_MASK_CMTGT_MEM             (_ULCAST_(0x1) << 0)
 302 #define  CM_GCR_REGn_MASK_CMTGT_IOCU0           (_ULCAST_(0x2) << 0)
 303 #define  CM_GCR_REGn_MASK_CMTGT_IOCU1           (_ULCAST_(0x3) << 0)
 304
 305 /* GCR_GIC_STATUS register fields */
 306 #define CM_GCR_GIC_STATUS_EX_SHF                0
 307 #define CM_GCR_GIC_STATUS_EX_MSK                (_ULCAST_(0x1) << 0)
 308
 309 /* GCR_CPC_STATUS register fields */
 310 #define CM_GCR_CPC_STATUS_EX_SHF                0
 311 #define CM_GCR_CPC_STATUS_EX_MSK                (_ULCAST_(0x1) << 0)
 312
 313 /* GCR_L2_CONFIG register fields */
 314 #define CM_GCR_L2_CONFIG_BYPASS_SHF             20
 315 #define CM_GCR_L2_CONFIG_BYPASS_MSK             (_ULCAST_(0x1) << 20)
 316 #define CM_GCR_L2_CONFIG_SET_SIZE_SHF           12
 317 #define CM_GCR_L2_CONFIG_SET_SIZE_MSK           (_ULCAST_(0xf) << 12)
 318 #define CM_GCR_L2_CONFIG_LINE_SIZE_SHF          8
 319 #define CM_GCR_L2_CONFIG_LINE_SIZE_MSK          (_ULCAST_(0xf) << 8)
 320 #define CM_GCR_L2_CONFIG_ASSOC_SHF              0
 321 #define CM_GCR_L2_CONFIG_ASSOC_MSK              (_ULCAST_(0xff) << 0)
 322
 323 /* GCR_SYS_CONFIG2 register fields */
 324 #define CM_GCR_SYS_CONFIG2_MAXVPW_SHF           0
 325 #define CM_GCR_SYS_CONFIG2_MAXVPW_MSK           (_ULCAST_(0xf) << 0)
 326
 327 /* GCR_L2_PFT_CONTROL register fields */
 328 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK_SHF      12
 329 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK_MSK      (_ULCAST_(0xfffff) << 12)
 330 #define CM_GCR_L2_PFT_CONTROL_PFTEN_SHF         8
 331 #define CM_GCR_L2_PFT_CONTROL_PFTEN_MSK         (_ULCAST_(0x1) << 8)
 332 #define CM_GCR_L2_PFT_CONTROL_NPFT_SHF          0
 333 #define CM_GCR_L2_PFT_CONTROL_NPFT_MSK          (_ULCAST_(0xff) << 0)
 334
 335 /* GCR_L2_PFT_CONTROL_B register fields */
 336 #define CM_GCR_L2_PFT_CONTROL_B_CEN_SHF         8
 337 #define CM_GCR_L2_PFT_CONTROL_B_CEN_MSK         (_ULCAST_(0x1) << 8)
 338 #define CM_GCR_L2_PFT_CONTROL_B_PORTID_SHF      0
 339 #define CM_GCR_L2_PFT_CONTROL_B_PORTID_MSK      (_ULCAST_(0xff) << 0)
 340
 341 /* GCR_Cx_COHERENCE register fields */
 342 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN_SHF     0
 343 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK     (_ULCAST_(0xff) << 0)
 344
 345 /* GCR_Cx_CONFIG register fields */
 346 #define CM_GCR_Cx_CONFIG_IOCUTYPE_SHF           10
 347 #define CM_GCR_Cx_CONFIG_IOCUTYPE_MSK           (_ULCAST_(0x3) << 10)
 348 #define CM_GCR_Cx_CONFIG_PVPE_SHF               0
 349 #define CM_GCR_Cx_CONFIG_PVPE_MSK               (_ULCAST_(0x1ff) << 0)
 350
 351 /* GCR_Cx_OTHER register fields */
 352 #define CM_GCR_Cx_OTHER_CORENUM_SHF             16
 353 #define CM_GCR_Cx_OTHER_CORENUM_MSK             (_ULCAST_(0xffff) << 16)
 354
 355 /* GCR_Cx_RESET_BASE register fields */
 356 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_SHF     12
 357 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_MSK     (_ULCAST_(0xfffff) << 12)
 358
 359 /* GCR_Cx_RESET_EXT_BASE register fields */
 360 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_SHF   31
 361 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_MSK   (_ULCAST_(0x1) << 31)
 362 #define CM_GCR_Cx_RESET_EXT_BASE_UEB_SHF        30
 363 #define CM_GCR_Cx_RESET_EXT_BASE_UEB_MSK        (_ULCAST_(0x1) << 30)
 364 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_SHF 20
 365 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_MSK (_ULCAST_(0xff) << 20)
 366 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_SHF   1
 367 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_MSK   (_ULCAST_(0x7f) << 1)
 368 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_SHF    0
 369 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_MSK    (_ULCAST_(0x1) << 0)
 370
 371 /**
 372  * mips_cm_numcores - return the number of cores present in the system
 373  *
 374  * Returns the value of the PCORES field of the GCR_CONFIG register plus 1, or
 375  * zero if no Coherence Manager is present.
 376  */
 377 static inline unsigned mips_cm_numcores(void)
 378 {
 379         if (!mips_cm_present())
 380                 return 0;
 381
 382         return ((read_gcr_config() & CM_GCR_CONFIG_PCORES_MSK)
 383                 >> CM_GCR_CONFIG_PCORES_SHF) + 1;
 384 }
 385
 386 /**
 387  * mips_cm_numiocu - return the number of IOCUs present in the system
 388  *
 389  * Returns the value of the NUMIOCU field of the GCR_CONFIG register, or zero
 390  * if no Coherence Manager is present.
 391  */
 392 static inline unsigned mips_cm_numiocu(void)
 393 {
 394         if (!mips_cm_present())
 395                 return 0;
 396
 397         return (read_gcr_config() & CM_GCR_CONFIG_NUMIOCU_MSK)
 398                 >> CM_GCR_CONFIG_NUMIOCU_SHF;
 399 }
 400
 401 /**
 402  * mips_cm_l2sync - perform an L2-only sync operation
 403  *
 404  * If an L2-only sync region is present in the system then this function
 405  * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV.
 406  */
 407 static inline int mips_cm_l2sync(void)
 408 {
 409         if (!mips_cm_has_l2sync())
 410                 return -ENODEV;
 411
 412         writel(0, mips_cm_l2sync_base);
 413         return 0;
 414 }
 415
 416 /**
 417  * mips_cm_revision() - return CM revision
 418  *
 419  * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The
 420  * return value should be checked against the CM_REV_* macros.
 421  */
 422 static inline int mips_cm_revision(void)
 423 {
 424         if (!mips_cm_present())
 425                 return 0;
 426
 427         return read_gcr_rev();
 428 }
 429
 430 /**
 431  * mips_cm_max_vp_width() - return the width in bits of VP indices
 432  *
 433  * Return: the width, in bits, of VP indices in fields that combine core & VP
 434  * indices.
 435  */
 436 static inline unsigned int mips_cm_max_vp_width(void)
 437 {
 438         extern int smp_num_siblings;
 439
 440         if (mips_cm_revision() >= CM_REV_CM3)
 441                 return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW_MSK;
 442
 443         return smp_num_siblings;
 444 }
 445
 446 /**
 447  * mips_cm_vp_id() - calculate the hardware VP ID for a CPU
 448  * @cpu: the CPU whose VP ID to calculate
 449  *
 450  * Hardware such as the GIC uses identifiers for VPs which may not match the
 451  * CPU numbers used by Linux. This function calculates the hardware VP
 452  * identifier corresponding to a given CPU.
 453  *
 454  * Return: the VP ID for the CPU.
 455  */
 456 static inline unsigned int mips_cm_vp_id(unsigned int cpu)
 457 {
 458         unsigned int core = cpu_data[cpu].core;
 459         unsigned int vp = cpu_vpe_id(&cpu_data[cpu]);
 460
 461         return (core * mips_cm_max_vp_width()) + vp;
 462 }
 463
 464 #endif /* __MIPS_ASM_MIPS_CM_H__ */