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

   1 /*
   2  * Copyright (C) 2013 Imagination Technologies
   3  * Author: Paul Burton <paul.burton@mips.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_CPS_H__
  12 # error Please include asm/mips-cps.h rather than asm/mips-cm.h
  13 #endif
  14
  15 #ifndef __MIPS_ASM_MIPS_CM_H__
  16 #define __MIPS_ASM_MIPS_CM_H__
  17
  18 #include <linux/bitops.h>
  19 #include <linux/errno.h>
  20
  21 /* The base address of the CM GCR block */
  22 extern void __iomem *mips_gcr_base;
  23
  24 /* The base address of the CM L2-only sync region */
  25 extern void __iomem *mips_cm_l2sync_base;
  26
  27 /**
  28  * __mips_cm_phys_base - retrieve the physical base address of the CM
  29  *
  30  * This function returns the physical base address of the Coherence Manager
  31  * global control block, or 0 if no Coherence Manager is present. It provides
  32  * a default implementation which reads the CMGCRBase register where available,
  33  * and may be overridden by platforms which determine this address in a
  34  * different way by defining a function with the same prototype except for the
  35  * name mips_cm_phys_base (without underscores).
  36  */
  37 extern phys_addr_t __mips_cm_phys_base(void);
  38
  39 /*
  40  * mips_cm_is64 - determine CM register width
  41  *
  42  * The CM register width is determined by the version of the CM, with CM3
  43  * introducing 64 bit GCRs and all prior CM versions having 32 bit GCRs.
  44  * However we may run a kernel built for MIPS32 on a system with 64 bit GCRs,
  45  * or vice-versa. This variable indicates the width of the memory accesses
  46  * that the kernel will perform to GCRs, which may differ from the actual
  47  * width of the GCRs.
  48  *
  49  * It's set to 0 for 32-bit accesses and 1 for 64-bit accesses.
  50  */
  51 extern int mips_cm_is64;
  52
  53 /**
  54  * mips_cm_error_report - Report CM cache errors
  55  */
  56 #ifdef CONFIG_MIPS_CM
  57 extern void mips_cm_error_report(void);
  58 #else
  59 static inline void mips_cm_error_report(void) {}
  60 #endif
  61
  62 /**
  63  * mips_cm_probe - probe for a Coherence Manager
  64  *
  65  * Attempt to detect the presence of a Coherence Manager. Returns 0 if a CM
  66  * is successfully detected, else -errno.
  67  */
  68 #ifdef CONFIG_MIPS_CM
  69 extern int mips_cm_probe(void);
  70 #else
  71 static inline int mips_cm_probe(void)
  72 {
  73         return -ENODEV;
  74 }
  75 #endif
  76
  77 /**
  78  * mips_cm_present - determine whether a Coherence Manager is present
  79  *
  80  * Returns true if a CM is present in the system, else false.
  81  */
  82 static inline bool mips_cm_present(void)
  83 {
  84 #ifdef CONFIG_MIPS_CM
  85         return mips_gcr_base != NULL;
  86 #else
  87         return false;
  88 #endif
  89 }
  90
  91 /**
  92  * mips_cm_has_l2sync - determine whether an L2-only sync region is present
  93  *
  94  * Returns true if the system implements an L2-only sync region, else false.
  95  */
  96 static inline bool mips_cm_has_l2sync(void)
  97 {
  98 #ifdef CONFIG_MIPS_CM
  99         return mips_cm_l2sync_base != NULL;
 100 #else
 101         return false;
 102 #endif
 103 }
 104
 105 /* Offsets to register blocks from the CM base address */
 106 #define MIPS_CM_GCB_OFS         0x0000 /* Global Control Block */
 107 #define MIPS_CM_CLCB_OFS        0x2000 /* Core Local Control Block */
 108 #define MIPS_CM_COCB_OFS        0x4000 /* Core Other Control Block */
 109 #define MIPS_CM_GDB_OFS         0x6000 /* Global Debug Block */
 110
 111 /* Total size of the CM memory mapped registers */
 112 #define MIPS_CM_GCR_SIZE        0x8000
 113
 114 /* Size of the L2-only sync region */
 115 #define MIPS_CM_L2SYNC_SIZE     0x1000
 116
 117 #define GCR_ACCESSOR_RO(sz, off, name)                                  \
 118         CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_GCB_OFS + off, name)           \
 119         CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name)
 120
 121 #define GCR_ACCESSOR_RW(sz, off, name)                                  \
 122         CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_GCB_OFS + off, name)           \
 123         CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, redir_##name)
 124
 125 #define GCR_CX_ACCESSOR_RO(sz, off, name)                               \
 126         CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name)     \
 127         CPS_ACCESSOR_RO(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name)
 128
 129 #define GCR_CX_ACCESSOR_RW(sz, off, name)                               \
 130         CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_CLCB_OFS + off, cl_##name)     \
 131         CPS_ACCESSOR_RW(gcr, sz, MIPS_CM_COCB_OFS + off, co_##name)
 132
 133 /* GCR_CONFIG - Information about the system */
 134 GCR_ACCESSOR_RO(64, 0x000, config)
 135 #define CM_GCR_CONFIG_CLUSTER_COH_CAPABLE       BIT_ULL(43)
 136 #define CM_GCR_CONFIG_CLUSTER_ID                GENMASK_ULL(39, 32)
 137 #define CM_GCR_CONFIG_NUM_CLUSTERS              GENMASK(29, 23)
 138 #define CM_GCR_CONFIG_NUMIOCU                   GENMASK(15, 8)
 139 #define CM_GCR_CONFIG_PCORES                    GENMASK(7, 0)
 140
 141 /* GCR_BASE - Base address of the Global Configuration Registers (GCRs) */
 142 GCR_ACCESSOR_RW(64, 0x008, base)
 143 #define CM_GCR_BASE_GCRBASE                     GENMASK_ULL(47, 15)
 144 #define CM_GCR_BASE_CMDEFTGT                    GENMASK(1, 0)
 145 #define  CM_GCR_BASE_CMDEFTGT_MEM               0
 146 #define  CM_GCR_BASE_CMDEFTGT_RESERVED          1
 147 #define  CM_GCR_BASE_CMDEFTGT_IOCU0             2
 148 #define  CM_GCR_BASE_CMDEFTGT_IOCU1             3
 149
 150 /* GCR_ACCESS - Controls core/IOCU access to GCRs */
 151 GCR_ACCESSOR_RW(32, 0x020, access)
 152 #define CM_GCR_ACCESS_ACCESSEN                  GENMASK(7, 0)
 153
 154 /* GCR_REV - Indicates the Coherence Manager revision */
 155 GCR_ACCESSOR_RO(32, 0x030, rev)
 156 #define CM_GCR_REV_MAJOR                        GENMASK(15, 8)
 157 #define CM_GCR_REV_MINOR                        GENMASK(7, 0)
 158
 159 #define CM_ENCODE_REV(major, minor) \
 160                 (((major) << __ffs(CM_GCR_REV_MAJOR)) | \
 161                  ((minor) << __ffs(CM_GCR_REV_MINOR)))
 162
 163 #define CM_REV_CM2                              CM_ENCODE_REV(6, 0)
 164 #define CM_REV_CM2_5                            CM_ENCODE_REV(7, 0)
 165 #define CM_REV_CM3                              CM_ENCODE_REV(8, 0)
 166 #define CM_REV_CM3_5                            CM_ENCODE_REV(9, 0)
 167
 168 /* GCR_ERR_CONTROL - Control error checking logic */
 169 GCR_ACCESSOR_RW(32, 0x038, err_control)
 170 #define CM_GCR_ERR_CONTROL_L2_ECC_EN            BIT(1)
 171 #define CM_GCR_ERR_CONTROL_L2_ECC_SUPPORT       BIT(0)
 172
 173 /* GCR_ERR_MASK - Control which errors are reported as interrupts */
 174 GCR_ACCESSOR_RW(64, 0x040, error_mask)
 175
 176 /* GCR_ERR_CAUSE - Indicates the type of error that occurred */
 177 GCR_ACCESSOR_RW(64, 0x048, error_cause)
 178 #define CM_GCR_ERROR_CAUSE_ERRTYPE              GENMASK(31, 27)
 179 #define CM3_GCR_ERROR_CAUSE_ERRTYPE             GENMASK_ULL(63, 58)
 180 #define CM_GCR_ERROR_CAUSE_ERRINFO              GENMASK(26, 0)
 181
 182 /* GCR_ERR_ADDR - Indicates the address associated with an error */
 183 GCR_ACCESSOR_RW(64, 0x050, error_addr)
 184
 185 /* GCR_ERR_MULT - Indicates when multiple errors have occurred */
 186 GCR_ACCESSOR_RW(64, 0x058, error_mult)
 187 #define CM_GCR_ERROR_MULT_ERR2ND                GENMASK(4, 0)
 188
 189 /* GCR_L2_ONLY_SYNC_BASE - Base address of the L2 cache-only sync region */
 190 GCR_ACCESSOR_RW(64, 0x070, l2_only_sync_base)
 191 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCBASE       GENMASK(31, 12)
 192 #define CM_GCR_L2_ONLY_SYNC_BASE_SYNCEN         BIT(0)
 193
 194 /* GCR_GIC_BASE - Base address of the Global Interrupt Controller (GIC) */
 195 GCR_ACCESSOR_RW(64, 0x080, gic_base)
 196 #define CM_GCR_GIC_BASE_GICBASE                 GENMASK(31, 17)
 197 #define CM_GCR_GIC_BASE_GICEN                   BIT(0)
 198
 199 /* GCR_CPC_BASE - Base address of the Cluster Power Controller (CPC) */
 200 GCR_ACCESSOR_RW(64, 0x088, cpc_base)
 201 #define CM_GCR_CPC_BASE_CPCBASE                 GENMASK(31, 15)
 202 #define CM_GCR_CPC_BASE_CPCEN                   BIT(0)
 203
 204 /* GCR_REGn_BASE - Base addresses of CM address regions */
 205 GCR_ACCESSOR_RW(64, 0x090, reg0_base)
 206 GCR_ACCESSOR_RW(64, 0x0a0, reg1_base)
 207 GCR_ACCESSOR_RW(64, 0x0b0, reg2_base)
 208 GCR_ACCESSOR_RW(64, 0x0c0, reg3_base)
 209 #define CM_GCR_REGn_BASE_BASEADDR               GENMASK(31, 16)
 210
 211 /* GCR_REGn_MASK - Size & destination of CM address regions */
 212 GCR_ACCESSOR_RW(64, 0x098, reg0_mask)
 213 GCR_ACCESSOR_RW(64, 0x0a8, reg1_mask)
 214 GCR_ACCESSOR_RW(64, 0x0b8, reg2_mask)
 215 GCR_ACCESSOR_RW(64, 0x0c8, reg3_mask)
 216 #define CM_GCR_REGn_MASK_ADDRMASK               GENMASK(31, 16)
 217 #define CM_GCR_REGn_MASK_CCAOVR                 GENMASK(7, 5)
 218 #define CM_GCR_REGn_MASK_CCAOVREN               BIT(4)
 219 #define CM_GCR_REGn_MASK_DROPL2                 BIT(2)
 220 #define CM_GCR_REGn_MASK_CMTGT                  GENMASK(1, 0)
 221 #define  CM_GCR_REGn_MASK_CMTGT_DISABLED        0x0
 222 #define  CM_GCR_REGn_MASK_CMTGT_MEM             0x1
 223 #define  CM_GCR_REGn_MASK_CMTGT_IOCU0           0x2
 224 #define  CM_GCR_REGn_MASK_CMTGT_IOCU1           0x3
 225
 226 /* GCR_GIC_STATUS - Indicates presence of a Global Interrupt Controller (GIC) */
 227 GCR_ACCESSOR_RO(32, 0x0d0, gic_status)
 228 #define CM_GCR_GIC_STATUS_EX                    BIT(0)
 229
 230 /* GCR_CPC_STATUS - Indicates presence of a Cluster Power Controller (CPC) */
 231 GCR_ACCESSOR_RO(32, 0x0f0, cpc_status)
 232 #define CM_GCR_CPC_STATUS_EX                    BIT(0)
 233
 234 /* GCR_L2_CONFIG - Indicates L2 cache configuration when Config5.L2C=1 */
 235 GCR_ACCESSOR_RW(32, 0x130, l2_config)
 236 #define CM_GCR_L2_CONFIG_BYPASS                 BIT(20)
 237 #define CM_GCR_L2_CONFIG_SET_SIZE               GENMASK(15, 12)
 238 #define CM_GCR_L2_CONFIG_LINE_SIZE              GENMASK(11, 8)
 239 #define CM_GCR_L2_CONFIG_ASSOC                  GENMASK(7, 0)
 240
 241 /* GCR_SYS_CONFIG2 - Further information about the system */
 242 GCR_ACCESSOR_RO(32, 0x150, sys_config2)
 243 #define CM_GCR_SYS_CONFIG2_MAXVPW               GENMASK(3, 0)
 244
 245 /* GCR_L2_PFT_CONTROL - Controls hardware L2 prefetching */
 246 GCR_ACCESSOR_RW(32, 0x300, l2_pft_control)
 247 #define CM_GCR_L2_PFT_CONTROL_PAGEMASK          GENMASK(31, 12)
 248 #define CM_GCR_L2_PFT_CONTROL_PFTEN             BIT(8)
 249 #define CM_GCR_L2_PFT_CONTROL_NPFT              GENMASK(7, 0)
 250
 251 /* GCR_L2_PFT_CONTROL_B - Controls hardware L2 prefetching */
 252 GCR_ACCESSOR_RW(32, 0x308, l2_pft_control_b)
 253 #define CM_GCR_L2_PFT_CONTROL_B_CEN             BIT(8)
 254 #define CM_GCR_L2_PFT_CONTROL_B_PORTID          GENMASK(7, 0)
 255
 256 /* GCR_L2SM_COP - L2 cache op state machine control */
 257 GCR_ACCESSOR_RW(32, 0x620, l2sm_cop)
 258 #define CM_GCR_L2SM_COP_PRESENT                 BIT(31)
 259 #define CM_GCR_L2SM_COP_RESULT                  GENMASK(8, 6)
 260 #define  CM_GCR_L2SM_COP_RESULT_DONTCARE        0
 261 #define  CM_GCR_L2SM_COP_RESULT_DONE_OK         1
 262 #define  CM_GCR_L2SM_COP_RESULT_DONE_ERROR      2
 263 #define  CM_GCR_L2SM_COP_RESULT_ABORT_OK        3
 264 #define  CM_GCR_L2SM_COP_RESULT_ABORT_ERROR     4
 265 #define CM_GCR_L2SM_COP_RUNNING                 BIT(5)
 266 #define CM_GCR_L2SM_COP_TYPE                    GENMASK(4, 2)
 267 #define  CM_GCR_L2SM_COP_TYPE_IDX_WBINV         0
 268 #define  CM_GCR_L2SM_COP_TYPE_IDX_STORETAG      1
 269 #define  CM_GCR_L2SM_COP_TYPE_IDX_STORETAGDATA  2
 270 #define  CM_GCR_L2SM_COP_TYPE_HIT_INV           4
 271 #define  CM_GCR_L2SM_COP_TYPE_HIT_WBINV         5
 272 #define  CM_GCR_L2SM_COP_TYPE_HIT_WB            6
 273 #define  CM_GCR_L2SM_COP_TYPE_FETCHLOCK         7
 274 #define CM_GCR_L2SM_COP_CMD                     GENMASK(1, 0)
 275 #define  CM_GCR_L2SM_COP_CMD_START              1       /* only when idle */
 276 #define  CM_GCR_L2SM_COP_CMD_ABORT              3       /* only when running */
 277
 278 /* GCR_L2SM_TAG_ADDR_COP - L2 cache op state machine address control */
 279 GCR_ACCESSOR_RW(64, 0x628, l2sm_tag_addr_cop)
 280 #define CM_GCR_L2SM_TAG_ADDR_COP_NUM_LINES      GENMASK_ULL(63, 48)
 281 #define CM_GCR_L2SM_TAG_ADDR_COP_START_TAG      GENMASK_ULL(47, 6)
 282
 283 /* GCR_BEV_BASE - Controls the location of the BEV for powered up cores */
 284 GCR_ACCESSOR_RW(64, 0x680, bev_base)
 285
 286 /* GCR_Cx_RESET_RELEASE - Controls core reset for CM 1.x */
 287 GCR_CX_ACCESSOR_RW(32, 0x000, reset_release)
 288
 289 /* GCR_Cx_COHERENCE - Controls core coherence */
 290 GCR_CX_ACCESSOR_RW(32, 0x008, coherence)
 291 #define CM_GCR_Cx_COHERENCE_COHDOMAINEN         GENMASK(7, 0)
 292 #define CM3_GCR_Cx_COHERENCE_COHEN              BIT(0)
 293
 294 /* GCR_Cx_CONFIG - Information about a core's configuration */
 295 GCR_CX_ACCESSOR_RO(32, 0x010, config)
 296 #define CM_GCR_Cx_CONFIG_IOCUTYPE               GENMASK(11, 10)
 297 #define CM_GCR_Cx_CONFIG_PVPE                   GENMASK(9, 0)
 298
 299 /* GCR_Cx_OTHER - Configure the core-other/redirect GCR block */
 300 GCR_CX_ACCESSOR_RW(32, 0x018, other)
 301 #define CM_GCR_Cx_OTHER_CORENUM                 GENMASK(31, 16) /* CM < 3 */
 302 #define CM_GCR_Cx_OTHER_CLUSTER_EN              BIT(31)         /* CM >= 3.5 */
 303 #define CM_GCR_Cx_OTHER_GIC_EN                  BIT(30)         /* CM >= 3.5 */
 304 #define CM_GCR_Cx_OTHER_BLOCK                   GENMASK(25, 24) /* CM >= 3.5 */
 305 #define  CM_GCR_Cx_OTHER_BLOCK_LOCAL            0
 306 #define  CM_GCR_Cx_OTHER_BLOCK_GLOBAL           1
 307 #define  CM_GCR_Cx_OTHER_BLOCK_USER             2
 308 #define  CM_GCR_Cx_OTHER_BLOCK_GLOBAL_HIGH      3
 309 #define CM_GCR_Cx_OTHER_CLUSTER                 GENMASK(21, 16) /* CM >= 3.5 */
 310 #define CM3_GCR_Cx_OTHER_CORE                   GENMASK(13, 8)  /* CM >= 3 */
 311 #define  CM_GCR_Cx_OTHER_CORE_CM                32
 312 #define CM3_GCR_Cx_OTHER_VP                     GENMASK(2, 0)   /* CM >= 3 */
 313
 314 /* GCR_Cx_RESET_BASE - Configure where powered up cores will fetch from */
 315 GCR_CX_ACCESSOR_RW(32, 0x020, reset_base)
 316 #define CM_GCR_Cx_RESET_BASE_BEVEXCBASE         GENMASK(31, 12)
 317
 318 /* GCR_Cx_ID - Identify the current core */
 319 GCR_CX_ACCESSOR_RO(32, 0x028, id)
 320 #define CM_GCR_Cx_ID_CLUSTER                    GENMASK(15, 8)
 321 #define CM_GCR_Cx_ID_CORE                       GENMASK(7, 0)
 322
 323 /* GCR_Cx_RESET_EXT_BASE - Configure behaviour when cores reset or power up */
 324 GCR_CX_ACCESSOR_RW(32, 0x030, reset_ext_base)
 325 #define CM_GCR_Cx_RESET_EXT_BASE_EVARESET       BIT(31)
 326 #define CM_GCR_Cx_RESET_EXT_BASE_UEB            BIT(30)
 327 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCMASK     GENMASK(27, 20)
 328 #define CM_GCR_Cx_RESET_EXT_BASE_BEVEXCPA       GENMASK(7, 1)
 329 #define CM_GCR_Cx_RESET_EXT_BASE_PRESENT        BIT(0)
 330
 331 /**
 332  * mips_cm_l2sync - perform an L2-only sync operation
 333  *
 334  * If an L2-only sync region is present in the system then this function
 335  * performs and L2-only sync and returns zero. Otherwise it returns -ENODEV.
 336  */
 337 static inline int mips_cm_l2sync(void)
 338 {
 339         if (!mips_cm_has_l2sync())
 340                 return -ENODEV;
 341
 342         writel(0, mips_cm_l2sync_base);
 343         return 0;
 344 }
 345
 346 /**
 347  * mips_cm_revision() - return CM revision
 348  *
 349  * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The
 350  * return value should be checked against the CM_REV_* macros.
 351  */
 352 static inline int mips_cm_revision(void)
 353 {
 354         if (!mips_cm_present())
 355                 return 0;
 356
 357         return read_gcr_rev();
 358 }
 359
 360 /**
 361  * mips_cm_max_vp_width() - return the width in bits of VP indices
 362  *
 363  * Return: the width, in bits, of VP indices in fields that combine core & VP
 364  * indices.
 365  */
 366 static inline unsigned int mips_cm_max_vp_width(void)
 367 {
 368         extern int smp_num_siblings;
 369         uint32_t cfg;
 370
 371         if (mips_cm_revision() >= CM_REV_CM3)
 372                 return read_gcr_sys_config2() & CM_GCR_SYS_CONFIG2_MAXVPW;
 373
 374         if (mips_cm_present()) {
 375                 /*
 376                  * We presume that all cores in the system will have the same
 377                  * number of VP(E)s, and if that ever changes then this will
 378                  * need revisiting.
 379                  */
 380                 cfg = read_gcr_cl_config() & CM_GCR_Cx_CONFIG_PVPE;
 381                 return (cfg >> __ffs(CM_GCR_Cx_CONFIG_PVPE)) + 1;
 382         }
 383
 384         if (IS_ENABLED(CONFIG_SMP))
 385                 return smp_num_siblings;
 386
 387         return 1;
 388 }
 389
 390 /**
 391  * mips_cm_vp_id() - calculate the hardware VP ID for a CPU
 392  * @cpu: the CPU whose VP ID to calculate
 393  *
 394  * Hardware such as the GIC uses identifiers for VPs which may not match the
 395  * CPU numbers used by Linux. This function calculates the hardware VP
 396  * identifier corresponding to a given CPU.
 397  *
 398  * Return: the VP ID for the CPU.
 399  */
 400 static inline unsigned int mips_cm_vp_id(unsigned int cpu)
 401 {
 402         unsigned int core = cpu_core(&cpu_data[cpu]);
 403         unsigned int vp = cpu_vpe_id(&cpu_data[cpu]);
 404
 405         return (core * mips_cm_max_vp_width()) + vp;
 406 }
 407
 408 #ifdef CONFIG_MIPS_CM
 409
 410 /**
 411  * mips_cm_lock_other - lock access to redirect/other region
 412  * @cluster: the other cluster to be accessed
 413  * @core: the other core to be accessed
 414  * @vp: the VP within the other core to be accessed
 415  * @block: the register block to be accessed
 416  *
 417  * Configure the redirect/other region for the local core/VP (depending upon
 418  * the CM revision) to target the specified @cluster, @core, @vp & register
 419  * @block. Must be called before using the redirect/other region, and followed
 420  * by a call to mips_cm_unlock_other() when access to the redirect/other region
 421  * is complete.
 422  *
 423  * This function acquires a spinlock such that code between it &
 424  * mips_cm_unlock_other() calls cannot be pre-empted by anything which may
 425  * reconfigure the redirect/other region, and cannot be interfered with by
 426  * another VP in the core. As such calls to this function should not be nested.
 427  */
 428 extern void mips_cm_lock_other(unsigned int cluster, unsigned int core,
 429                                unsigned int vp, unsigned int block);
 430
 431 /**
 432  * mips_cm_unlock_other - unlock access to redirect/other region
 433  *
 434  * Must be called after mips_cm_lock_other() once all required access to the
 435  * redirect/other region has been completed.
 436  */
 437 extern void mips_cm_unlock_other(void);
 438
 439 #else /* !CONFIG_MIPS_CM */
 440
 441 static inline void mips_cm_lock_other(unsigned int cluster, unsigned int core,
 442                                       unsigned int vp, unsigned int block) { }
 443 static inline void mips_cm_unlock_other(void) { }
 444
 445 #endif /* !CONFIG_MIPS_CM */
 446
 447 /**
 448  * mips_cm_lock_other_cpu - lock access to redirect/other region
 449  * @cpu: the other CPU whose register we want to access
 450  *
 451  * Configure the redirect/other region for the local core/VP (depending upon
 452  * the CM revision) to target the specified @cpu & register @block. This is
 453  * equivalent to calling mips_cm_lock_other() but accepts a Linux CPU number
 454  * for convenience.
 455  */
 456 static inline void mips_cm_lock_other_cpu(unsigned int cpu, unsigned int block)
 457 {
 458         struct cpuinfo_mips *d = &cpu_data[cpu];
 459
 460         mips_cm_lock_other(cpu_cluster(d), cpu_core(d), cpu_vpe_id(d), block);
 461 }
 462
 463 #endif /* __MIPS_ASM_MIPS_CM_H__ */