LXR linux/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 */
  20extern void __iomem *mips_cm_base;
  21
  22/* The base address of the CM L2-only sync region */
  23extern 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 */
  35extern 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 */
  49extern int mips_cm_is64;
  50
  51/**
  52 * mips_cm_error_report - Report CM cache errors
  53 */
  54#ifdef CONFIG_MIPS_CM
  55extern void mips_cm_error_report(void);
  56#else
  57static 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
  67extern int mips_cm_probe(void);
  68#else
  69static 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 */
  80static 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 */
  94static 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)                                  \
 117static inline unsigned long __iomem *addr_gcr_##name(void)      \
 118{                                                               \
 119        return (unsigned long __iomem *)(mips_cm_base + (off)); \
 120}                                                               \
 121                                                                \
 122static inline u32 read32_gcr_##name(void)                       \
 123{                                                               \
 124        return __raw_readl(addr_gcr_##name());                  \
 125}                                                               \
 126                                                                \
 127static 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                                                                \
 142static 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)                                  \
 151static inline void write32_gcr_##name(u32 value)                \
 152{                                                               \
 153        __raw_writel(value, addr_gcr_##name());                 \
 154}                                                               \
 155                                                                \
 156static inline void write64_gcr_##name(u64 value)                \
 157{                                                               \
 158        __raw_writeq(value, addr_gcr_##name());                 \
 159}                                                               \
 160                                                                \
 161static 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 */
 186BUILD_CM_R_(config,             MIPS_CM_GCB_OFS + 0x00)
 187BUILD_CM_RW(base,               MIPS_CM_GCB_OFS + 0x08)
 188BUILD_CM_RW(access,             MIPS_CM_GCB_OFS + 0x20)
 189BUILD_CM_R_(rev,                MIPS_CM_GCB_OFS + 0x30)
 190BUILD_CM_RW(error_mask,         MIPS_CM_GCB_OFS + 0x40)
 191BUILD_CM_RW(error_cause,        MIPS_CM_GCB_OFS + 0x48)
 192BUILD_CM_RW(error_addr,         MIPS_CM_GCB_OFS + 0x50)
 193BUILD_CM_RW(error_mult,         MIPS_CM_GCB_OFS + 0x58)
 194BUILD_CM_RW(l2_only_sync_base,  MIPS_CM_GCB_OFS + 0x70)
 195BUILD_CM_RW(gic_base,           MIPS_CM_GCB_OFS + 0x80)
 196BUILD_CM_RW(cpc_base,           MIPS_CM_GCB_OFS + 0x88)
 197BUILD_CM_RW(reg0_base,          MIPS_CM_GCB_OFS + 0x90)
 198BUILD_CM_RW(reg0_mask,          MIPS_CM_GCB_OFS + 0x98)
 199BUILD_CM_RW(reg1_base,          MIPS_CM_GCB_OFS + 0xa0)
 200BUILD_CM_RW(reg1_mask,          MIPS_CM_GCB_OFS + 0xa8)
 201BUILD_CM_RW(reg2_base,          MIPS_CM_GCB_OFS + 0xb0)
 202BUILD_CM_RW(reg2_mask,          MIPS_CM_GCB_OFS + 0xb8)
 203BUILD_CM_RW(reg3_base,          MIPS_CM_GCB_OFS + 0xc0)
 204BUILD_CM_RW(reg3_mask,          MIPS_CM_GCB_OFS + 0xc8)
 205BUILD_CM_R_(gic_status,         MIPS_CM_GCB_OFS + 0xd0)
 206BUILD_CM_R_(cpc_status,         MIPS_CM_GCB_OFS + 0xf0)
 207BUILD_CM_RW(l2_config,          MIPS_CM_GCB_OFS + 0x130)
 208BUILD_CM_RW(sys_config2,        MIPS_CM_GCB_OFS + 0x150)
 209BUILD_CM_RW(l2_pft_control,     MIPS_CM_GCB_OFS + 0x300)
 210BUILD_CM_RW(l2_pft_control_b,   MIPS_CM_GCB_OFS + 0x308)
 211
 212/* Core Local & Core Other register accessor functions */
 213BUILD_CM_Cx_RW(reset_release,   0x00)
 214BUILD_CM_Cx_RW(coherence,       0x08)
 215BUILD_CM_Cx_R_(config,          0x10)
 216BUILD_CM_Cx_RW(other,           0x18)
 217BUILD_CM_Cx_RW(reset_base,      0x20)
 218BUILD_CM_Cx_R_(id,              0x28)
 219BUILD_CM_Cx_RW(reset_ext_base,  0x30)
 220BUILD_CM_Cx_R_(tcid_0_priority, 0x40)
 221BUILD_CM_Cx_R_(tcid_1_priority, 0x48)
 222BUILD_CM_Cx_R_(tcid_2_priority, 0x50)
 223BUILD_CM_Cx_R_(tcid_3_priority, 0x58)
 224BUILD_CM_Cx_R_(tcid_4_priority, 0x60)
 225BUILD_CM_Cx_R_(tcid_5_priority, 0x68)
 226BUILD_CM_Cx_R_(tcid_6_priority, 0x70)
 227BUILD_CM_Cx_R_(tcid_7_priority, 0x78)
 228BUILD_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_RESET_EXT_BASE register fields */
 247#define CM_GCR_RESET_EXT_BASE_EVARESET          BIT(31)
 248#define CM_GCR_RESET_EXT_BASE_UEB               BIT(30)
 249
 250/* GCR_ACCESS register fields */
 251#define CM_GCR_ACCESS_ACCESSEN_SHF              0
 252#define CM_GCR_ACCESS_ACCESSEN_MSK              (_ULCAST_(0xff) << 0)
 253
 254/* GCR_REV register fields */
 255#define CM_GCR_REV_MAJOR_SHF                    8
 256#define CM_GCR_REV_MAJOR_MSK                    (_ULCAST_(0xff) << 8)
 257#define CM_GCR_REV_MINOR_SHF                    0
 258#define CM_GCR_REV_MINOR_MSK                    (_ULCAST_(0xff) << 0)
 259
 260#define CM_ENCODE_REV(major, minor) \
 261                (((major) << CM_GCR_REV_MAJOR_SHF) | \
 262                 ((minor) << CM_GCR_REV_MINOR_SHF))
 263
 264#define CM_REV_CM2                              CM_ENCODE_REV(6, 0)
 265#define CM_REV_CM2_5                            CM_ENCODE_REV(7, 0)
 266#define CM_REV_CM3                              CM_ENCODE_REV(8, 0)
 267
 268/* GCR_ERROR_CAUSE register fields */
 269#define CM_GCR_ERROR_CAUSE_ERRTYPE_SHF          27
 270#define CM_GCR_ERROR_CAUSE_ERRTYPE_MSK          (_ULCAST_(0x1f) << 27)
 271#define CM3_GCR_ERROR_CAUSE_ERRTYPE_SHF         58
 272#define CM3_GCR_ERROR_CAUSE_ERRTYPE_MSK         GENMASK_ULL(63, 58)
 273#define CM_GCR_ERROR_CAUSE_ERRINFO_SHF          0
 274#define CM_GCR_ERROR_CAUSE_ERRINGO_MSK          (_ULCAST_(0x7ffffff) << 0)
 275
 276/* GCR_ERROR_MULT register fields */
 277#define CM_GCR_ERROR_MULT_ERR2ND_SHF            0
 278#define CM_GCR_ERROR_MULT_ERR2ND_MSK            (_ULCAST_(0x1f) << 0)
 279
 280/* GCR_L2_ONLY_SYNC_BASE register fields */
 281#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_SHF   12
 282#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE_MSK   (_ULCAST_(0xfffff) << 12)
 283#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_SHF     0
 284#define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN_MSK     (_ULCAST_(0x1) << 0)
 285
 286/* GCR_GIC_BASE register fields */
 287#define CM_GCR_GIC_BASE_GICBASE_SHF             17
 288#define CM_GCR_GIC_BASE_GICBASE_MSK             (_ULCAST_(0x7fff) << 17)
 289#define CM_GCR_GIC_BASE_GICEN_SHF               0
 290#define CM_GCR_GIC_BASE_GICEN_MSK               (_ULCAST_(0x1) << 0)
 291
 292/* GCR_CPC_BASE register fields */
 293#define CM_GCR_CPC_BASE_CPCBASE_SHF             17
 294#define CM_GCR_CPC_BASE_CPCBASE_MSK             (_ULCAST_(0x7fff) << 17)
 295#define CM_GCR_CPC_BASE_CPCEN_SHF               0
 296#define CM_GCR_CPC_BASE_CPCEN_MSK               (_ULCAST_(0x1) << 0)
 297
 298/* GCR_GIC_STATUS register fields */
 299#define CM_GCR_GIC_STATUS_GICEX_SHF             0
 300#define CM_GCR_GIC_STATUS_GICEX_MSK             (_ULCAST_(0x1) << 0)
 301
 302/* GCR_REGn_BASE register fields */
 303#define CM_GCR_REGn_BASE_BASEADDR_SHF           16
 304#define CM_GCR_REGn_BASE_BASEADDR_MSK           (_ULCAST_(0xffff) << 16)
 305
 306/* GCR_REGn_MASK register fields */
 307#define CM_GCR_REGn_MASK_ADDRMASK_SHF           16
 308#define CM_GCR_REGn_MASK_ADDRMASK_MSK           (_ULCAST_(0xffff) << 16)
 309#define CM_GCR_REGn_MASK_CCAOVR_SHF             5
 310#define CM_GCR_REGn_MASK_CCAOVR_MSK             (_ULCAST_(0x3) << 5)
 311#define CM_GCR_REGn_MASK_CCAOVREN_SHF           4
 312#define CM_GCR_REGn_MASK_CCAOVREN_MSK           (_ULCAST_(0x1) << 4)
 313#define CM_GCR_REGn_MASK_DROPL2_SHF             2
 314#define CM_GCR_REGn_MASK_DROPL2_MSK             (_ULCAST_(0x1) << 2)
 315#define CM_GCR_REGn_MASK_CMTGT_SHF              0
 316#define CM_GCR_REGn_MASK_CMTGT_MSK              (_ULCAST_(0x3) << 0)
 317#define  CM_GCR_REGn_MASK_CMTGT_DISABLED        (_ULCAST_(0x0) << 0)
 318#define  CM_GCR_REGn_MASK_CMTGT_MEM             (_ULCAST_(0x1) << 0)
 319#define  CM_GCR_REGn_MASK_CMTGT_IOCU0           (_ULCAST_(0x2) << 0)
 320#define  CM_GCR_REGn_MASK_CMTGT_IOCU1           (_ULCAST_(0x3) << 0)
 321
 322/* GCR_GIC_STATUS register fields */
 323#define CM_GCR_GIC_STATUS_EX_SHF                0
 324#define CM_GCR_GIC_STATUS_EX_MSK                (_ULCAST_(0x1) << 0)
 325
 326/* GCR_CPC_STATUS register fields */
 327#define CM_GCR_CPC_STATUS_EX_SHF                0
 328#define CM_GCR_CPC_STATUS_EX_MSK                (_ULCAST_(0x1) << 0)
 329
 330/* GCR_L2_CONFIG register fields */
 331#define CM_GCR_L2_CONFIG_BYPASS_SHF             20
 332#define CM_GCR_L2_CONFIG_BYPASS_MSK             (_ULCAST_(0x1) << 20)
 333#define CM_GCR_L2_CONFIG_SET_SIZE_SHF           12
 334#define CM_GCR_L2_CONFIG_SET_SIZE_MSK           (_ULCAST_(0xf) << 12)
 335#define CM_GCR_L2_CONFIG_LINE_SIZE_SHF          8
 336#define CM_GCR_L2_CONFIG_LINE_SIZE_MSK          (_ULCAST_(0xf) << 8)
 337#define CM_GCR_L2_CONFIG_ASSOC_SHF              0
 338#define CM_GCR_L2_CONFIG_ASSOC_MSK              (_ULCAST_(0xff) << 0)
 339
 340/* GCR_SYS_CONFIG2 register fields */
 341#define CM_GCR_SYS_CONFIG2_MAXVPW_SHF           0
 342#define CM_GCR_SYS_CONFIG2_MAXVPW_MSK           (_ULCAST_(0xf) << 0)
 343
 344/* GCR_L2_PFT_CONTROL register fields */
 345#define CM_GCR_L2_PFT_CONTROL_PAGEMASK_SHF      12
 346#define CM_GCR_L2_PFT_CONTROL_PAGEMASK_MSK      (_ULCAST_(0xfffff) << 12)
 347#define CM_GCR_L2_PFT_CONTROL_PFTEN_SHF         8
 348#define CM_GCR_L2_PFT_CONTROL_PFTEN_MSK         (_ULCAST_(0x1) << 8)
 349#define CM_GCR_L2_PFT_CONTROL_NPFT_SHF          0
 350#define CM_GCR_L2_PFT_CONTROL_NPFT_MSK          (_ULCAST_(0xff) << 0)
 351
 352/* GCR_L2_PFT_CONTROL_B register fields */
 353#define CM_GCR_L2_PFT_CONTROL_B_CEN_SHF         8
 354#define CM_GCR_L2_PFT_CONTROL_B_CEN_MSK         (_ULCAST_(0x1) << 8)
 355#define CM_GCR_L2_PFT_CONTROL_B_PORTID_SHF      0
 356#define CM_GCR_L2_PFT_CONTROL_B_PORTID_MSK      (_ULCAST_(0xff) << 0)
 357
 358/* GCR_Cx_COHERENCE register fields */
 359#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_SHF     0
 360#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK     (_ULCAST_(0xff) << 0)
 361
 362/* GCR_Cx_CONFIG register fields */
 363#define CM_GCR_Cx_CONFIG_IOCUTYPE_SHF           10
 364#define CM_GCR_Cx_CONFIG_IOCUTYPE_MSK           (_ULCAST_(0x3) << 10)
 365#define CM_GCR_Cx_CONFIG_PVPE_SHF               0
 366#define CM_GCR_Cx_CONFIG_PVPE_MSK               (_ULCAST_(0x3ff) << 0)
 367
 368/* GCR_Cx_OTHER register fields */
 369#define CM_GCR_Cx_OTHER_CORENUM_SHF             16
 370#define CM_GCR_Cx_OTHER_CORENUM_MSK             (_ULCAST_(0xffff) << 16)
 371#define CM3_GCR_Cx_OTHER_CORE_SHF               8
 372#define CM3_GCR_Cx_OTHER_CORE_MSK               (_ULCAST_(0x3f) << 8)
 373#define CM3_GCR_Cx_OTHER_VP_SHF                 0
 374#define CM3_GCR_Cx_OTHER_VP_MSK                 (_ULCAST_(0x7) << 0)
 375
 376/* GCR_Cx_RESET_BASE register fields */
 377#define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_SHF     12
 378#define CM_GCR_Cx_RESET_BASE_BEVEXCBASE_MSK     (_ULCAST_(0xfffff) << 12)
 379
 380/* GCR_Cx_RESET_EXT_BASE register fields */
 381#define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_SHF   31
 382#define CM_GCR_Cx_RESET_EXT_BASE_EVARESET_MSK   (_ULCAST_(0x1) << 31)
 383#define CM_GCR_Cx_RESET_EXT_BASE_UEB_SHF        30
 384#define CM_GCR_Cx_RESET_EXT_BASE_UEB_MSK        (_ULCAST_(0x1) << 30)
 385#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_SHF 20
 386#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK_MSK (_ULCAST_(0xff) << 20)
 387#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_SHF   1
 388#define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA_MSK   (_ULCAST_(0x7f) << 1)
 389#define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_SHF    0
 390#define CM_GCR_Cx_RESET_EXT_BASE_PRESENT_MSK    (_ULCAST_(0x1) << 0)
 391
 392/**
 393 * mips_cm_numcores - return the number of cores present in the system
 394 *
 395 * Returns the value of the PCORES field of the GCR_CONFIG register plus 1, or
 396 * zero if no Coherence Manager is present.
 397 */
 398static inline unsigned mips_cm_numcores(void)
 399{
 400        if (!mips_cm_present())
 401                return 0;
 402
 403        return ((read_gcr_config() & CM_GCR_CONFIG_PCORES_MSK)
 404                >> CM_GCR_CONFIG_PCORES_SHF) + 1;
 405}
 406
 407/**
 408 * mips_cm_numiocu - return the number of IOCUs present in the system
 409 *
 410 * Returns the value of the NUMIOCU field of the GCR_CONFIG register, or zero
 411 * if no Coherence Manager is present.
 412 */
 413static inline unsigned mips_cm_numiocu(void)
 414{
 415        if (!mips_cm_present())
 416                return 0;
 417
 418        return (read_gcr_config() & CM_GCR_CONFIG_NUMIOCU_MSK)
 419                >> CM_GCR_CONFIG_NUMIOCU_SHF;
 420}
 421
 422/**
 423 * mips_cm_l2sync - perform an L2-only sync operation
 424 *
 425 * If an L2-only sync region is present in the system then this function
 426 * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV.
 427 */
 428static inline int mips_cm_l2sync(void)
 429{
 430        if (!mips_cm_has_l2sync())
 431                return -ENODEV;
 432
 433        writel(0, mips_cm_l2sync_base);
 434        return 0;
 435}
 436
 437/**
 438 * mips_cm_revision() - return CM revision
 439 *
 440 * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The
 441 * return value should be checked against the CM_REV_* macros.
 442 */
 443static inline int mips_cm_revision(void)
 444{
 445        if (!mips_cm_present())
 446                return 0;
 447
 448        return read_gcr_rev();
 449}
 450
 451/**
 452 * mips_cm_max_vp_width() - return the width in bits of VP indices
 453 *
 454 * Return: the width, in bits, of VP indices in fields that combine core & VP
 455 * indices.
 456 */
 457static inline unsigned int mips_cm_max_vp_width(void)
 458{
 459        extern int smp_num_siblings;
 460
 461        if (mips_cm_revision() >= CM_REV_CM3)
 462                return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW_MSK;
 463
 464        return smp_num_siblings;
 465}
 466
 467/**
 468 * mips_cm_vp_id() - calculate the hardware VP ID for a CPU
 469 * @cpu: the CPU whose VP ID to calculate
 470 *
 471 * Hardware such as the GIC uses identifiers for VPs which may not match the
 472 * CPU numbers used by Linux. This function calculates the hardware VP
 473 * identifier corresponding to a given CPU.
 474 *
 475 * Return: the VP ID for the CPU.
 476 */
 477static inline unsigned int mips_cm_vp_id(unsigned int cpu)
 478{
 479        unsigned int core = cpu_data[cpu].core;
 480        unsigned int vp = cpu_vpe_id(&cpu_data[cpu]);
 481
 482        return (core * mips_cm_max_vp_width()) + vp;
 483}
 484
 485#ifdef CONFIG_MIPS_CM
 486
 487/**
 488 * mips_cm_lock_other - lock access to another core
 489 * @core: the other core to be accessed
 490 * @vp: the VP within the other core to be accessed
 491 *
 492 * Call before operating upon a core via the 'other' register region in
 493 * order to prevent the region being moved during access. Must be followed
 494 * by a call to mips_cm_unlock_other.
 495 */
 496extern void mips_cm_lock_other(unsigned int core, unsigned int vp);
 497
 498/**
 499 * mips_cm_unlock_other - unlock access to another core
 500 *
 501 * Call after operating upon another core via the 'other' register region.
 502 * Must be called after mips_cm_lock_other.
 503 */
 504extern void mips_cm_unlock_other(void);
 505
 506#else /* !CONFIG_MIPS_CM */
 507
 508static inline void mips_cm_lock_other(unsigned int core) { }
 509static inline void mips_cm_unlock_other(void) { }
 510
 511#endif /* !CONFIG_MIPS_CM */
 512
 513#endif /* __MIPS_ASM_MIPS_CM_H__ */
 514