tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2017 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_CPS_H__
12#define __MIPS_ASM_MIPS_CPS_H__
13
14#include <linux/io.h>
15#include <linux/types.h>
16
17extern unsigned long __cps_access_bad_size(void)
18 __compiletime_error("Bad size for CPS accessor");
19
20#define CPS_ACCESSOR_A(unit, off, name) \
21static inline void *addr_##unit##_##name(void) \
22{ \
23 return mips_##unit##_base + (off); \
24}
25
26#define CPS_ACCESSOR_R(unit, sz, name) \
27static inline uint##sz##_t read_##unit##_##name(void) \
28{ \
29 uint64_t val64; \
30 \
31 switch (sz) { \
32 case 32: \
33 return __raw_readl(addr_##unit##_##name()); \
34 \
35 case 64: \
36 if (mips_cm_is64) \
37 return __raw_readq(addr_##unit##_##name()); \
38 \
39 val64 = __raw_readl(addr_##unit##_##name() + 4); \
40 val64 <<= 32; \
41 val64 |= __raw_readl(addr_##unit##_##name()); \
42 return val64; \
43 \
44 default: \
45 return __cps_access_bad_size(); \
46 } \
47}
48
49#define CPS_ACCESSOR_W(unit, sz, name) \
50static inline void write_##unit##_##name(uint##sz##_t val) \
51{ \
52 switch (sz) { \
53 case 32: \
54 __raw_writel(val, addr_##unit##_##name()); \
55 break; \
56 \
57 case 64: \
58 if (mips_cm_is64) { \
59 __raw_writeq(val, addr_##unit##_##name()); \
60 break; \
61 } \
62 \
63 __raw_writel((uint64_t)val >> 32, \
64 addr_##unit##_##name() + 4); \
65 __raw_writel(val, addr_##unit##_##name()); \
66 break; \
67 \
68 default: \
69 __cps_access_bad_size(); \
70 break; \
71 } \
72}
73
74#define CPS_ACCESSOR_M(unit, sz, name) \
75static inline void change_##unit##_##name(uint##sz##_t mask, \
76 uint##sz##_t val) \
77{ \
78 uint##sz##_t reg_val = read_##unit##_##name(); \
79 reg_val &= ~mask; \
80 reg_val |= val; \
81 write_##unit##_##name(reg_val); \
82} \
83 \
84static inline void set_##unit##_##name(uint##sz##_t val) \
85{ \
86 change_##unit##_##name(val, val); \
87} \
88 \
89static inline void clear_##unit##_##name(uint##sz##_t val) \
90{ \
91 change_##unit##_##name(val, 0); \
92}
93
94#define CPS_ACCESSOR_RO(unit, sz, off, name) \
95 CPS_ACCESSOR_A(unit, off, name) \
96 CPS_ACCESSOR_R(unit, sz, name)
97
98#define CPS_ACCESSOR_WO(unit, sz, off, name) \
99 CPS_ACCESSOR_A(unit, off, name) \
100 CPS_ACCESSOR_W(unit, sz, name)
101
102#define CPS_ACCESSOR_RW(unit, sz, off, name) \
103 CPS_ACCESSOR_A(unit, off, name) \
104 CPS_ACCESSOR_R(unit, sz, name) \
105 CPS_ACCESSOR_W(unit, sz, name) \
106 CPS_ACCESSOR_M(unit, sz, name)
107
108#include <asm/mips-cm.h>
109#include <asm/mips-cpc.h>
110#include <asm/mips-gic.h>
111
112/**
113 * mips_cps_numclusters - return the number of clusters present in the system
114 *
115 * Returns the number of clusters in the system.
116 */
117static inline unsigned int mips_cps_numclusters(void)
118{
119 unsigned int num_clusters;
120
121 if (mips_cm_revision() < CM_REV_CM3_5)
122 return 1;
123
124 num_clusters = read_gcr_config() & CM_GCR_CONFIG_NUM_CLUSTERS;
125 num_clusters >>= __ffs(CM_GCR_CONFIG_NUM_CLUSTERS);
126 return num_clusters;
127}
128
129/**
130 * mips_cps_cluster_config - return (GCR|CPC)_CONFIG from a cluster
131 * @cluster: the ID of the cluster whose config we want
132 *
133 * Read the value of GCR_CONFIG (or its CPC_CONFIG mirror) from a @cluster.
134 *
135 * Returns the value of GCR_CONFIG.
136 */
137static inline uint64_t mips_cps_cluster_config(unsigned int cluster)
138{
139 uint64_t config;
140
141 if (mips_cm_revision() < CM_REV_CM3_5) {
142 /*
143 * Prior to CM 3.5 we don't have the notion of multiple
144 * clusters so we can trivially read the GCR_CONFIG register
145 * within this cluster.
146 */
147 WARN_ON(cluster != 0);
148 config = read_gcr_config();
149 } else {
150 /*
151 * From CM 3.5 onwards we read the CPC_CONFIG mirror of
152 * GCR_CONFIG via the redirect region, since the CPC is always
153 * powered up allowing us not to need to power up the CM.
154 */
155 mips_cm_lock_other(cluster, 0, 0, CM_GCR_Cx_OTHER_BLOCK_GLOBAL);
156 config = read_cpc_redir_config();
157 mips_cm_unlock_other();
158 }
159
160 return config;
161}
162
163/**
164 * mips_cps_numcores - return the number of cores present in a cluster
165 * @cluster: the ID of the cluster whose core count we want
166 *
167 * Returns the value of the PCORES field of the GCR_CONFIG register plus 1, or
168 * zero if no Coherence Manager is present.
169 */
170static inline unsigned int mips_cps_numcores(unsigned int cluster)
171{
172 if (!mips_cm_present())
173 return 0;
174
175 /* Add one before masking to handle 0xff indicating no cores */
176 return (mips_cps_cluster_config(cluster) + 1) & CM_GCR_CONFIG_PCORES;
177}
178
179/**
180 * mips_cps_numiocu - return the number of IOCUs present in a cluster
181 * @cluster: the ID of the cluster whose IOCU count we want
182 *
183 * Returns the value of the NUMIOCU field of the GCR_CONFIG register, or zero
184 * if no Coherence Manager is present.
185 */
186static inline unsigned int mips_cps_numiocu(unsigned int cluster)
187{
188 unsigned int num_iocu;
189
190 if (!mips_cm_present())
191 return 0;
192
193 num_iocu = mips_cps_cluster_config(cluster) & CM_GCR_CONFIG_NUMIOCU;
194 num_iocu >>= __ffs(CM_GCR_CONFIG_NUMIOCU);
195 return num_iocu;
196}
197
198/**
199 * mips_cps_numvps - return the number of VPs (threads) supported by a core
200 * @cluster: the ID of the cluster containing the core we want to examine
201 * @core: the ID of the core whose VP count we want
202 *
203 * Returns the number of Virtual Processors (VPs, ie. hardware threads) that
204 * are supported by the given @core in the given @cluster. If the core or the
205 * kernel do not support hardware mutlti-threading this returns 1.
206 */
207static inline unsigned int mips_cps_numvps(unsigned int cluster, unsigned int core)
208{
209 unsigned int cfg;
210
211 if (!mips_cm_present())
212 return 1;
213
214 if ((!IS_ENABLED(CONFIG_MIPS_MT_SMP) || !cpu_has_mipsmt)
215 && (!IS_ENABLED(CONFIG_CPU_MIPSR6) || !cpu_has_vp))
216 return 1;
217
218 mips_cm_lock_other(cluster, core, 0, CM_GCR_Cx_OTHER_BLOCK_LOCAL);
219
220 if (mips_cm_revision() < CM_REV_CM3_5) {
221 /*
222 * Prior to CM 3.5 we can only have one cluster & don't have
223 * CPC_Cx_CONFIG, so we read GCR_Cx_CONFIG.
224 */
225 cfg = read_gcr_co_config();
226 } else {
227 /*
228 * From CM 3.5 onwards we read CPC_Cx_CONFIG because the CPC is
229 * always powered, which allows us to not worry about powering
230 * up the cluster's CM here.
231 */
232 cfg = read_cpc_co_config();
233 }
234
235 mips_cm_unlock_other();
236
237 return (cfg + 1) & CM_GCR_Cx_CONFIG_PVPE;
238}
239
240#endif /* __MIPS_ASM_MIPS_CPS_H__ */