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1/*
2 * This program is free software; you can distribute it and/or modify it
3 * under the terms of the GNU General Public License (Version 2) as
4 * published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope it will be useful, but WITHOUT
7 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
9 * for more details.
10 *
11 * You should have received a copy of the GNU General Public License along
12 * with this program; if not, write to the Free Software Foundation, Inc.,
13 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
14 *
15 * Copyright (C) 2004, 05, 06 MIPS Technologies, Inc.
16 * Elizabeth Clarke (beth@mips.com)
17 * Ralf Baechle (ralf@linux-mips.org)
18 * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
19 */
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/cpumask.h>
23#include <linux/interrupt.h>
24#include <linux/compiler.h>
25#include <linux/smp.h>
26
27#include <linux/atomic.h>
28#include <asm/cacheflush.h>
29#include <asm/cpu.h>
30#include <asm/processor.h>
31#include <asm/system.h>
32#include <asm/hardirq.h>
33#include <asm/mmu_context.h>
34#include <asm/time.h>
35#include <asm/mipsregs.h>
36#include <asm/mipsmtregs.h>
37#include <asm/mips_mt.h>
38
39static void __init smvp_copy_vpe_config(void)
40{
41 write_vpe_c0_status(
42 (read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0);
43
44 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
45 write_vpe_c0_config( read_c0_config());
46
47 /* make sure there are no software interrupts pending */
48 write_vpe_c0_cause(0);
49
50 /* Propagate Config7 */
51 write_vpe_c0_config7(read_c0_config7());
52
53 write_vpe_c0_count(read_c0_count());
54}
55
56static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0,
57 unsigned int ncpu)
58{
59 if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT))
60 return ncpu;
61
62 /* Deactivate all but VPE 0 */
63 if (tc != 0) {
64 unsigned long tmp = read_vpe_c0_vpeconf0();
65
66 tmp &= ~VPECONF0_VPA;
67
68 /* master VPE */
69 tmp |= VPECONF0_MVP;
70 write_vpe_c0_vpeconf0(tmp);
71
72 /* Record this as available CPU */
73 set_cpu_possible(tc, true);
74 __cpu_number_map[tc] = ++ncpu;
75 __cpu_logical_map[ncpu] = tc;
76 }
77
78 /* Disable multi-threading with TC's */
79 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
80
81 if (tc != 0)
82 smvp_copy_vpe_config();
83
84 return ncpu;
85}
86
87static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0)
88{
89 unsigned long tmp;
90
91 if (!tc)
92 return;
93
94 /* bind a TC to each VPE, May as well put all excess TC's
95 on the last VPE */
96 if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1))
97 write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT));
98 else {
99 write_tc_c0_tcbind(read_tc_c0_tcbind() | tc);
100
101 /* and set XTC */
102 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT));
103 }
104
105 tmp = read_tc_c0_tcstatus();
106
107 /* mark not allocated and not dynamically allocatable */
108 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
109 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
110 write_tc_c0_tcstatus(tmp);
111
112 write_tc_c0_tchalt(TCHALT_H);
113}
114
115static void vsmp_send_ipi_single(int cpu, unsigned int action)
116{
117 int i;
118 unsigned long flags;
119 int vpflags;
120
121 local_irq_save(flags);
122
123 vpflags = dvpe(); /* can't access the other CPU's registers whilst MVPE enabled */
124
125 switch (action) {
126 case SMP_CALL_FUNCTION:
127 i = C_SW1;
128 break;
129
130 case SMP_RESCHEDULE_YOURSELF:
131 default:
132 i = C_SW0;
133 break;
134 }
135
136 /* 1:1 mapping of vpe and tc... */
137 settc(cpu);
138 write_vpe_c0_cause(read_vpe_c0_cause() | i);
139 evpe(vpflags);
140
141 local_irq_restore(flags);
142}
143
144static void vsmp_send_ipi_mask(const struct cpumask *mask, unsigned int action)
145{
146 unsigned int i;
147
148 for_each_cpu(i, mask)
149 vsmp_send_ipi_single(i, action);
150}
151
152static void __cpuinit vsmp_init_secondary(void)
153{
154 extern int gic_present;
155
156 /* This is Malta specific: IPI,performance and timer interrupts */
157 if (gic_present)
158 change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP4 |
159 STATUSF_IP6 | STATUSF_IP7);
160 else
161 change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 |
162 STATUSF_IP6 | STATUSF_IP7);
163}
164
165static void __cpuinit vsmp_smp_finish(void)
166{
167 /* CDFIXME: remove this? */
168 write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
169
170#ifdef CONFIG_MIPS_MT_FPAFF
171 /* If we have an FPU, enroll ourselves in the FPU-full mask */
172 if (cpu_has_fpu)
173 cpu_set(smp_processor_id(), mt_fpu_cpumask);
174#endif /* CONFIG_MIPS_MT_FPAFF */
175
176 local_irq_enable();
177}
178
179static void vsmp_cpus_done(void)
180{
181}
182
183/*
184 * Setup the PC, SP, and GP of a secondary processor and start it
185 * running!
186 * smp_bootstrap is the place to resume from
187 * __KSTK_TOS(idle) is apparently the stack pointer
188 * (unsigned long)idle->thread_info the gp
189 * assumes a 1:1 mapping of TC => VPE
190 */
191static void __cpuinit vsmp_boot_secondary(int cpu, struct task_struct *idle)
192{
193 struct thread_info *gp = task_thread_info(idle);
194 dvpe();
195 set_c0_mvpcontrol(MVPCONTROL_VPC);
196
197 settc(cpu);
198
199 /* restart */
200 write_tc_c0_tcrestart((unsigned long)&smp_bootstrap);
201
202 /* enable the tc this vpe/cpu will be running */
203 write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
204
205 write_tc_c0_tchalt(0);
206
207 /* enable the VPE */
208 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
209
210 /* stack pointer */
211 write_tc_gpr_sp( __KSTK_TOS(idle));
212
213 /* global pointer */
214 write_tc_gpr_gp((unsigned long)gp);
215
216 flush_icache_range((unsigned long)gp,
217 (unsigned long)(gp + sizeof(struct thread_info)));
218
219 /* finally out of configuration and into chaos */
220 clear_c0_mvpcontrol(MVPCONTROL_VPC);
221
222 evpe(EVPE_ENABLE);
223}
224
225/*
226 * Common setup before any secondaries are started
227 * Make sure all CPU's are in a sensible state before we boot any of the
228 * secondaries
229 */
230static void __init vsmp_smp_setup(void)
231{
232 unsigned int mvpconf0, ntc, tc, ncpu = 0;
233 unsigned int nvpe;
234
235#ifdef CONFIG_MIPS_MT_FPAFF
236 /* If we have an FPU, enroll ourselves in the FPU-full mask */
237 if (cpu_has_fpu)
238 cpu_set(0, mt_fpu_cpumask);
239#endif /* CONFIG_MIPS_MT_FPAFF */
240 if (!cpu_has_mipsmt)
241 return;
242
243 /* disable MT so we can configure */
244 dvpe();
245 dmt();
246
247 /* Put MVPE's into 'configuration state' */
248 set_c0_mvpcontrol(MVPCONTROL_VPC);
249
250 mvpconf0 = read_c0_mvpconf0();
251 ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT;
252
253 nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
254 smp_num_siblings = nvpe;
255
256 /* we'll always have more TC's than VPE's, so loop setting everything
257 to a sensible state */
258 for (tc = 0; tc <= ntc; tc++) {
259 settc(tc);
260
261 smvp_tc_init(tc, mvpconf0);
262 ncpu = smvp_vpe_init(tc, mvpconf0, ncpu);
263 }
264
265 /* Release config state */
266 clear_c0_mvpcontrol(MVPCONTROL_VPC);
267
268 /* We'll wait until starting the secondaries before starting MVPE */
269
270 printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu);
271}
272
273static void __init vsmp_prepare_cpus(unsigned int max_cpus)
274{
275 mips_mt_set_cpuoptions();
276}
277
278struct plat_smp_ops vsmp_smp_ops = {
279 .send_ipi_single = vsmp_send_ipi_single,
280 .send_ipi_mask = vsmp_send_ipi_mask,
281 .init_secondary = vsmp_init_secondary,
282 .smp_finish = vsmp_smp_finish,
283 .cpus_done = vsmp_cpus_done,
284 .boot_secondary = vsmp_boot_secondary,
285 .smp_setup = vsmp_smp_setup,
286 .prepare_cpus = vsmp_prepare_cpus,
287};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Copyright (C) 2004, 05, 06 MIPS Technologies, Inc.
5 * Elizabeth Clarke (beth@mips.com)
6 * Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
8 */
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/cpumask.h>
12#include <linux/interrupt.h>
13#include <linux/compiler.h>
14#include <linux/sched/task_stack.h>
15#include <linux/smp.h>
16
17#include <linux/atomic.h>
18#include <asm/cacheflush.h>
19#include <asm/cpu.h>
20#include <asm/processor.h>
21#include <asm/hardirq.h>
22#include <asm/mmu_context.h>
23#include <asm/time.h>
24#include <asm/mipsregs.h>
25#include <asm/mipsmtregs.h>
26#include <asm/mips_mt.h>
27#include <asm/mips-cps.h>
28
29static void __init smvp_copy_vpe_config(void)
30{
31 write_vpe_c0_status(
32 (read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0);
33
34 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
35 write_vpe_c0_config( read_c0_config());
36
37 /* make sure there are no software interrupts pending */
38 write_vpe_c0_cause(0);
39
40 /* Propagate Config7 */
41 write_vpe_c0_config7(read_c0_config7());
42
43 write_vpe_c0_count(read_c0_count());
44}
45
46static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0,
47 unsigned int ncpu)
48{
49 if (tc >= smp_max_threads ||
50 (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)))
51 return ncpu;
52
53 /* Deactivate all but VPE 0 */
54 if (tc != 0) {
55 unsigned long tmp = read_vpe_c0_vpeconf0();
56
57 tmp &= ~VPECONF0_VPA;
58
59 /* master VPE */
60 tmp |= VPECONF0_MVP;
61 write_vpe_c0_vpeconf0(tmp);
62
63 /* Record this as available CPU */
64 set_cpu_possible(tc, true);
65 set_cpu_present(tc, true);
66 __cpu_number_map[tc] = ++ncpu;
67 __cpu_logical_map[ncpu] = tc;
68 }
69
70 /* Disable multi-threading with TC's */
71 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
72
73 if (tc != 0)
74 smvp_copy_vpe_config();
75
76 cpu_set_vpe_id(&cpu_data[ncpu], tc);
77
78 return ncpu;
79}
80
81static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0)
82{
83 unsigned long tmp;
84
85 if (!tc)
86 return;
87
88 /* bind a TC to each VPE, May as well put all excess TC's
89 on the last VPE */
90 if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1))
91 write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT));
92 else {
93 write_tc_c0_tcbind(read_tc_c0_tcbind() | tc);
94
95 /* and set XTC */
96 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT));
97 }
98
99 tmp = read_tc_c0_tcstatus();
100
101 /* mark not allocated and not dynamically allocatable */
102 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
103 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
104 write_tc_c0_tcstatus(tmp);
105
106 write_tc_c0_tchalt(TCHALT_H);
107}
108
109static void vsmp_init_secondary(void)
110{
111 /* This is Malta specific: IPI,performance and timer interrupts */
112 if (mips_gic_present())
113 change_c0_status(ST0_IM, STATUSF_IP2 | STATUSF_IP3 |
114 STATUSF_IP4 | STATUSF_IP5 |
115 STATUSF_IP6 | STATUSF_IP7);
116 else
117 change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 |
118 STATUSF_IP6 | STATUSF_IP7);
119}
120
121static void vsmp_smp_finish(void)
122{
123 /* CDFIXME: remove this? */
124 write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
125
126#ifdef CONFIG_MIPS_MT_FPAFF
127 /* If we have an FPU, enroll ourselves in the FPU-full mask */
128 if (cpu_has_fpu)
129 cpumask_set_cpu(smp_processor_id(), &mt_fpu_cpumask);
130#endif /* CONFIG_MIPS_MT_FPAFF */
131
132 local_irq_enable();
133}
134
135/*
136 * Setup the PC, SP, and GP of a secondary processor and start it
137 * running!
138 * smp_bootstrap is the place to resume from
139 * __KSTK_TOS(idle) is apparently the stack pointer
140 * (unsigned long)idle->thread_info the gp
141 * assumes a 1:1 mapping of TC => VPE
142 */
143static int vsmp_boot_secondary(int cpu, struct task_struct *idle)
144{
145 struct thread_info *gp = task_thread_info(idle);
146 dvpe();
147 set_c0_mvpcontrol(MVPCONTROL_VPC);
148
149 settc(cpu);
150
151 /* restart */
152 write_tc_c0_tcrestart((unsigned long)&smp_bootstrap);
153
154 /* enable the tc this vpe/cpu will be running */
155 write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
156
157 write_tc_c0_tchalt(0);
158
159 /* enable the VPE */
160 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
161
162 /* stack pointer */
163 write_tc_gpr_sp( __KSTK_TOS(idle));
164
165 /* global pointer */
166 write_tc_gpr_gp((unsigned long)gp);
167
168 flush_icache_range((unsigned long)gp,
169 (unsigned long)(gp + sizeof(struct thread_info)));
170
171 /* finally out of configuration and into chaos */
172 clear_c0_mvpcontrol(MVPCONTROL_VPC);
173
174 evpe(EVPE_ENABLE);
175
176 return 0;
177}
178
179/*
180 * Common setup before any secondaries are started
181 * Make sure all CPU's are in a sensible state before we boot any of the
182 * secondaries
183 */
184static void __init vsmp_smp_setup(void)
185{
186 unsigned int mvpconf0, ntc, tc, ncpu = 0;
187 unsigned int nvpe;
188
189#ifdef CONFIG_MIPS_MT_FPAFF
190 /* If we have an FPU, enroll ourselves in the FPU-full mask */
191 if (cpu_has_fpu)
192 cpumask_set_cpu(0, &mt_fpu_cpumask);
193#endif /* CONFIG_MIPS_MT_FPAFF */
194 if (!cpu_has_mipsmt)
195 return;
196
197 /* disable MT so we can configure */
198 dvpe();
199 dmt();
200
201 /* Put MVPE's into 'configuration state' */
202 set_c0_mvpcontrol(MVPCONTROL_VPC);
203
204 mvpconf0 = read_c0_mvpconf0();
205 ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT;
206
207 nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
208 smp_num_siblings = nvpe;
209
210 /* we'll always have more TC's than VPE's, so loop setting everything
211 to a sensible state */
212 for (tc = 0; tc <= ntc; tc++) {
213 settc(tc);
214
215 smvp_tc_init(tc, mvpconf0);
216 ncpu = smvp_vpe_init(tc, mvpconf0, ncpu);
217 }
218
219 /* Release config state */
220 clear_c0_mvpcontrol(MVPCONTROL_VPC);
221
222 /* We'll wait until starting the secondaries before starting MVPE */
223
224 printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu);
225}
226
227static void __init vsmp_prepare_cpus(unsigned int max_cpus)
228{
229 mips_mt_set_cpuoptions();
230}
231
232const struct plat_smp_ops vsmp_smp_ops = {
233 .send_ipi_single = mips_smp_send_ipi_single,
234 .send_ipi_mask = mips_smp_send_ipi_mask,
235 .init_secondary = vsmp_init_secondary,
236 .smp_finish = vsmp_smp_finish,
237 .boot_secondary = vsmp_boot_secondary,
238 .smp_setup = vsmp_smp_setup,
239 .prepare_cpus = vsmp_prepare_cpus,
240};
241