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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__ */