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/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 overriden 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
 212 /* Core Local & Core Other register accessor functions */
 213 BUILD_CM_Cx_RW(reset_release,   0x00)
 214 BUILD_CM_Cx_RW(coherence,       0x08)
 215 BUILD_CM_Cx_R_(config,          0x10)
 216 BUILD_CM_Cx_RW(other,           0x18)
 217 BUILD_CM_Cx_RW(reset_base,      0x20)
 218 BUILD_CM_Cx_R_(id,              0x28)
 219 BUILD_CM_Cx_RW(reset_ext_base,  0x30)
 220 BUILD_CM_Cx_R_(tcid_0_priority, 0x40)
 221 BUILD_CM_Cx_R_(tcid_1_priority, 0x48)
 222 BUILD_CM_Cx_R_(tcid_2_priority, 0x50)
 223 BUILD_CM_Cx_R_(tcid_3_priority, 0x58)
 224 BUILD_CM_Cx_R_(tcid_4_priority, 0x60)
 225 BUILD_CM_Cx_R_(tcid_5_priority, 0x68)
 226 BUILD_CM_Cx_R_(tcid_6_priority, 0x70)
 227 BUILD_CM_Cx_R_(tcid_7_priority, 0x78)
 228 BUILD_CM_Cx_R_(tcid_8_priority, 0x80)
 229
 230 /* GCR_CONFIG register fields */
 231 #define CM_GCR_CONFIG_NUMIOCU_SHF               8
 232 #define CM_GCR_CONFIG_NUMIOCU_MSK               (_ULCAST_(0xf) << 8)
 233 #define CM_GCR_CONFIG_PCORES_SHF                0
 234 #define CM_GCR_CONFIG_PCORES_MSK                (_ULCAST_(0xff) << 0)
 235
 236 /* GCR_BASE register fields */
 237 #define CM_GCR_BASE_GCRBASE_SHF                 15
 238 #define CM_GCR_BASE_GCRBASE_MSK                 (_ULCAST_(0x1ffff) << 15)
 239 #define CM_GCR_BASE_CMDEFTGT_SHF                0
 240 #define CM_GCR_BASE_CMDEFTGT_MSK                (_ULCAST_(0x3) << 0)
 241 #define  CM_GCR_BASE_CMDEFTGT_DISABLED          0
 242 #define  CM_GCR_BASE_CMDEFTGT_MEM               1
 243 #define  CM_GCR_BASE_CMDEFTGT_IOCU0             2
 244 #define  CM_GCR_BASE_CMDEFTGT_IOCU1             3
 245
 246 /* GCR_ACCESS register fields */
 247 #define CM_GCR_ACCESS_ACCESSEN_SHF              0
 248 #define CM_GCR_ACCESS_ACCESSEN_MSK              (_ULCAST_(0xff) << 0)
 249
 250 /* GCR_REV register fields */
 251 #define CM_GCR_REV_MAJOR_SHF                    8
 252 #define CM_GCR_REV_MAJOR_MSK                    (_ULCAST_(0xff) << 8)
 253 #define CM_GCR_REV_MINOR_SHF                    0
 254 #define CM_GCR_REV_MINOR_MSK                    (_ULCAST_(0xff) << 0)
 255
 256 #define CM_ENCODE_REV(major, minor) \
 257                 (((major) << CM_GCR_REV_MAJOR_SHF) | \
 258                  ((minor) << CM_GCR_REV_MINOR_SHF))
 259
 260 #define CM_REV_CM2                              CM_ENCODE_REV(6, 0)
 261 #define CM_REV_CM2_5                            CM_ENCODE_REV(7, 0)
 262 #define CM_REV_CM3                              CM_ENCODE_REV(8, 0)
 263
 264 /* GCR_ERROR_CAUSE register fields */
 265 #define CM_GCR_ERROR_CAUSE_ERRTYPE_SHF          27
 266 #define CM_GCR_ERROR_CAUSE_ERRTYPE_MSK          (_ULCAST_(0x1f) << 27)
 267 #define CM3_GCR_ERROR_CAUSE_ERRTYPE_SHF         58
 268 #define CM3_GCR_ERROR_CAUSE_ERRTYPE_MSK         GENMASK_ULL(63, 58)
 269 #define CM_GCR_ERROR_CAUSE_ERRINFO_SHF          0
 270 #define CM_GCR_ERROR_CAUSE_ERRINGO_MSK          (_ULCAST_(0x7ffffff) << 0)
 271
 272 /* GCR_ERROR_MULT register fields */
 273 #define CM_GCR_ERROR_MULT_ERR2ND_SHF            0
 274 #define CM_GCR_ERROR_MULT_ERR2ND_MSK            (_ULCAST_(0x1f) << 0)
 275
 276 /* GCR_L2_ONLY_SYNC_BASE register fields */
 277 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_SHF   12
 278 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK   (_ULCAST_(0xfffff) << 12)
 279 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_SHF     0
 280 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK     (_ULCAST_(0x1) << 0)
 281
 282 /* GCR_GIC_BASE register fields */
 283 #define CM_GCR_GIC_BASE_GICBASE_SHF             17
 284 #define CM_GCR_GIC_BASE_GICBASE_MSK             (_ULCAST_(0x7fff) << 17)
 285 #define CM_GCR_GIC_BASE_GICEN_SHF               0
 286 #define CM_GCR_GIC_BASE_GICEN_MSK               (_ULCAST_(0x1) << 0)
 287
 288 /* GCR_CPC_BASE register fields */
 289 #define CM_GCR_CPC_BASE_CPCBASE_SHF             17
 290 #define CM_GCR_CPC_BASE_CPCBASE_MSK             (_ULCAST_(0x7fff) << 17)
 291 #define CM_GCR_CPC_BASE_CPCEN_SHF               0
 292 #define CM_GCR_CPC_BASE_CPCEN_MSK               (_ULCAST_(0x1) << 0)
 293
 294 /* GCR_GIC_STATUS register fields */
 295 #define CM_GCR_GIC_STATUS_GICEX_SHF             0
 296 #define CM_GCR_GIC_STATUS_GICEX_MSK             (_ULCAST_(0x1) << 0)
 297
 298 /* GCR_REGn_BASE register fields */
 299 #define CM_GCR_REGn_BASE_BASEADDR_SHF           16
 300 #define CM_GCR_REGn_BASE_BASEADDR_MSK           (_ULCAST_(0xffff) << 16)
 301
 302 /* GCR_REGn_MASK register fields */
 303 #define CM_GCR_REGn_MASK_ADDRMASK_SHF           16
 304 #define CM_GCR_REGn_MASK_ADDRMASK_MSK           (_ULCAST_(0xffff) << 16)
 305 #define CM_GCR_REGn_MASK_CCAOVR_SHF             5
 306 #define CM_GCR_REGn_MASK_CCAOVR_MSK             (_ULCAST_(0x3) << 5)
 307 #define CM_GCR_REGn_MASK_CCAOVREN_SHF           4
 308 #define CM_GCR_REGn_MASK_CCAOVREN_MSK           (_ULCAST_(0x1) << 4)
 309 #define CM_GCR_REGn_MASK_DROPL2_SHF             2
 310 #define CM_GCR_REGn_MASK_DROPL2_MSK             (_ULCAST_(0x1) << 2)
 311 #define CM_GCR_REGn_MASK_CMTGT_SHF              0
 312 #define CM_GCR_REGn_MASK_CMTGT_MSK              (_ULCAST_(0x3) << 0)
 313 #define  CM_GCR_REGn_MASK_CMTGT_DISABLED        (_ULCAST_(0x0) << 0)
 314 #define  CM_GCR_REGn_MASK_CMTGT_MEM             (_ULCAST_(0x1) << 0)
 315 #define  CM_GCR_REGn_MASK_CMTGT_IOCU0           (_ULCAST_(0x2) << 0)
 316 #define  CM_GCR_REGn_MASK_CMTGT_IOCU1           (_ULCAST_(0x3) << 0)
 317
 318 /* GCR_GIC_STATUS register fields */
 319 #define CM_GCR_GIC_STATUS_EX_SHF                0
 320 #define CM_GCR_GIC_STATUS_EX_MSK                (_ULCAST_(0x1) << 0)
 321
 322 /* GCR_CPC_STATUS register fields */
 323 #define CM_GCR_CPC_STATUS_EX_SHF                0
 324 #define CM_GCR_CPC_STATUS_EX_MSK                (_ULCAST_(0x1) << 0)
 325
 326 /* GCR_L2_CONFIG register fields */
 327 #define CM_GCR_L2_CONFIG_BYPASS_SHF             20
 328 #define CM_GCR_L2_CONFIG_BYPASS_MSK             (_ULCAST_(0x1) << 20)
 329 #define CM_GCR_L2_CONFIG_SET_SIZE_SHF           12
 330 #define CM_GCR_L2_CONFIG_SET_SIZE_MSK           (_ULCAST_(0xf) << 12)
 331 #define CM_GCR_L2_CONFIG_LINE_SIZE_SHF          8
 332 #define CM_GCR_L2_CONFIG_LINE_SIZE_MSK          (_ULCAST_(0xf) << 8)
 333 #define CM_GCR_L2_CONFIG_ASSOC_SHF              0
 334 #define CM_GCR_L2_CONFIG_ASSOC_MSK              (_ULCAST_(0xff) << 0)
 335
 336 /* GCR_SYS_CONFIG2 register fields */
 337 #define CM_GCR_SYS_CONFIG2_MAXVPW_SHF           0
 338 #define CM_GCR_SYS_CONFIG2_MAXVPW_MSK           (_ULCAST_(0xf) << 0)
 339
 340 /* GCR_L2_PFT_CONTROL register fields */
 341 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK_SHF      12
 342 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK_MSK      (_ULCAST_(0xfffff) << 12)
 343 #define CM_GCR_L2_PFT_CONTROL_PFTEN_SHF         8
 344 #define CM_GCR_L2_PFT_CONTROL_PFTEN_MSK         (_ULCAST_(0x1) << 8)
 345 #define CM_GCR_L2_PFT_CONTROL_NPFT_SHF          0
 346 #define CM_GCR_L2_PFT_CONTROL_NPFT_MSK          (_ULCAST_(0xff) << 0)
 347
 348 /* GCR_L2_PFT_CONTROL_B register fields */
 349 #define CM_GCR_L2_PFT_CONTROL_B_CEN_SHF         8
 350 #define CM_GCR_L2_PFT_CONTROL_B_CEN_MSK         (_ULCAST_(0x1) << 8)
 351 #define CM_GCR_L2_PFT_CONTROL_B_PORTID_SHF      0
 352 #define CM_GCR_L2_PFT_CONTROL_B_PORTID_MSK      (_ULCAST_(0xff) << 0)
 353
 354 /* GCR_Cx_COHERENCE register fields */
 355 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN_SHF     0
 356 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK     (_ULCAST_(0xff) << 0)
 357
 358 /* GCR_Cx_CONFIG register fields */
 359 #define CM_GCR_Cx_CONFIG_IOCUTYPE_SHF           10
 360 #define CM_GCR_Cx_CONFIG_IOCUTYPE_MSK           (_ULCAST_(0x3) << 10)
 361 #define CM_GCR_Cx_CONFIG_PVPE_SHF               0
 362 #define CM_GCR_Cx_CONFIG_PVPE_MSK               (_ULCAST_(0x3ff) << 0)
 363
 364 /* GCR_Cx_OTHER register fields */
 365 #define CM_GCR_Cx_OTHER_CORENUM_SHF             16
 366 #define CM_GCR_Cx_OTHER_CORENUM_MSK             (_ULCAST_(0xffff) << 16)
 367 #define CM3_GCR_Cx_OTHER_CORE_SHF               8
 368 #define CM3_GCR_Cx_OTHER_CORE_MSK               (_ULCAST_(0x3f) << 8)
 369 #define CM3_GCR_Cx_OTHER_VP_SHF                 0
 370 #define CM3_GCR_Cx_OTHER_VP_MSK                 (_ULCAST_(0x7) << 0)
 371
 372 /* GCR_Cx_RESET_BASE register fields */
 373 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_SHF     12
 374 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_MSK     (_ULCAST_(0xfffff) << 12)
 375
 376 /* GCR_Cx_RESET_EXT_BASE register fields */
 377 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_SHF   31
 378 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_MSK   (_ULCAST_(0x1) << 31)
 379 #define CM_GCR_Cx_RESET_EXT_BASE_UEB_SHF        30
 380 #define CM_GCR_Cx_RESET_EXT_BASE_UEB_MSK        (_ULCAST_(0x1) << 30)
 381 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_SHF 20
 382 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_MSK (_ULCAST_(0xff) << 20)
 383 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_SHF   1
 384 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_MSK   (_ULCAST_(0x7f) << 1)
 385 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_SHF    0
 386 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_MSK    (_ULCAST_(0x1) << 0)
 387
 388 /**
 389  * mips_cm_numcores - return the number of cores present in the system
 390  *
 391  * Returns the value of the PCORES field of the GCR_CONFIG register plus 1, or
 392  * zero if no Coherence Manager is present.
 393  */
 394 static inline unsigned mips_cm_numcores(void)
 395 {
 396         if (!mips_cm_present())
 397                 return 0;
 398
 399         return ((read_gcr_config() & CM_GCR_CONFIG_PCORES_MSK)
 400                 >> CM_GCR_CONFIG_PCORES_SHF) + 1;
 401 }
 402
 403 /**
 404  * mips_cm_numiocu - return the number of IOCUs present in the system
 405  *
 406  * Returns the value of the NUMIOCU field of the GCR_CONFIG register, or zero
 407  * if no Coherence Manager is present.
 408  */
 409 static inline unsigned mips_cm_numiocu(void)
 410 {
 411         if (!mips_cm_present())
 412                 return 0;
 413
 414         return (read_gcr_config() & CM_GCR_CONFIG_NUMIOCU_MSK)
 415                 >> CM_GCR_CONFIG_NUMIOCU_SHF;
 416 }
 417
 418 /**
 419  * mips_cm_l2sync - perform an L2-only sync operation
 420  *
 421  * If an L2-only sync region is present in the system then this function
 422  * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV.
 423  */
 424 static inline int mips_cm_l2sync(void)
 425 {
 426         if (!mips_cm_has_l2sync())
 427                 return -ENODEV;
 428
 429         writel(0, mips_cm_l2sync_base);
 430         return 0;
 431 }
 432
 433 /**
 434  * mips_cm_revision() - return CM revision
 435  *
 436  * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The
 437  * return value should be checked against the CM_REV_* macros.
 438  */
 439 static inline int mips_cm_revision(void)
 440 {
 441         if (!mips_cm_present())
 442                 return 0;
 443
 444         return read_gcr_rev();
 445 }
 446
 447 /**
 448  * mips_cm_max_vp_width() - return the width in bits of VP indices
 449  *
 450  * Return: the width, in bits, of VP indices in fields that combine core & VP
 451  * indices.
 452  */
 453 static inline unsigned int mips_cm_max_vp_width(void)
 454 {
 455         extern int smp_num_siblings;
 456
 457         if (mips_cm_revision() >= CM_REV_CM3)
 458                 return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW_MSK;
 459
 460         return smp_num_siblings;
 461 }
 462
 463 /**
 464  * mips_cm_vp_id() - calculate the hardware VP ID for a CPU
 465  * @cpu: the CPU whose VP ID to calculate
 466  *
 467  * Hardware such as the GIC uses identifiers for VPs which may not match the
 468  * CPU numbers used by Linux. This function calculates the hardware VP
 469  * identifier corresponding to a given CPU.
 470  *
 471  * Return: the VP ID for the CPU.
 472  */
 473 static inline unsigned int mips_cm_vp_id(unsigned int cpu)
 474 {
 475         unsigned int core = cpu_data[cpu].core;
 476         unsigned int vp = cpu_vpe_id(&cpu_data[cpu]);
 477
 478         return (core * mips_cm_max_vp_width()) + vp;
 479 }
 480
 481 #ifdef CONFIG_MIPS_CM
 482
 483 /**
 484  * mips_cm_lock_other - lock access to another core
 485  * @core: the other core to be accessed
 486  * @vp: the VP within the other core to be accessed
 487  *
 488  * Call before operating upon a core via the 'other' register region in
 489  * order to prevent the region being moved during access. Must be followed
 490  * by a call to mips_cm_unlock_other.
 491  */
 492 extern void mips_cm_lock_other(unsigned int core, unsigned int vp);
 493
 494 /**
 495  * mips_cm_unlock_other - unlock access to another core
 496  *
 497  * Call after operating upon another core via the 'other' register region.
 498  * Must be called after mips_cm_lock_other.
 499  */
 500 extern void mips_cm_unlock_other(void);
 501
 502 #else /* !CONFIG_MIPS_CM */
 503
 504 static inline void mips_cm_lock_other(unsigned int core) { }
 505 static inline void mips_cm_unlock_other(void) { }
 506
 507 #endif /* !CONFIG_MIPS_CM */
 508
 509 #endif /* __MIPS_ASM_MIPS_CM_H__ */