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340ee4b9 | 1 | /* |
340ee4b9 RB |
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 | * | |
41c594ab RB |
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) | |
340ee4b9 RB |
19 | */ |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/cpumask.h> | |
23 | #include <linux/interrupt.h> | |
4060bbe9 | 24 | #include <linux/irqchip/mips-gic.h> |
340ee4b9 | 25 | #include <linux/compiler.h> |
fc69910f | 26 | #include <linux/sched/task_stack.h> |
0ab7aefc | 27 | #include <linux/smp.h> |
340ee4b9 | 28 | |
60063497 | 29 | #include <linux/atomic.h> |
41c594ab | 30 | #include <asm/cacheflush.h> |
340ee4b9 RB |
31 | #include <asm/cpu.h> |
32 | #include <asm/processor.h> | |
340ee4b9 RB |
33 | #include <asm/hardirq.h> |
34 | #include <asm/mmu_context.h> | |
340ee4b9 RB |
35 | #include <asm/time.h> |
36 | #include <asm/mipsregs.h> | |
37 | #include <asm/mipsmtregs.h> | |
41c594ab | 38 | #include <asm/mips_mt.h> |
340ee4b9 | 39 | |
39b8d525 | 40 | static void __init smvp_copy_vpe_config(void) |
781b0f8d RB |
41 | { |
42 | write_vpe_c0_status( | |
43 | (read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0); | |
44 | ||
45 | /* set config to be the same as vpe0, particularly kseg0 coherency alg */ | |
46 | write_vpe_c0_config( read_c0_config()); | |
47 | ||
48 | /* make sure there are no software interrupts pending */ | |
49 | write_vpe_c0_cause(0); | |
50 | ||
51 | /* Propagate Config7 */ | |
52 | write_vpe_c0_config7(read_c0_config7()); | |
70e46f48 RB |
53 | |
54 | write_vpe_c0_count(read_c0_count()); | |
781b0f8d RB |
55 | } |
56 | ||
39b8d525 | 57 | static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0, |
781b0f8d RB |
58 | unsigned int ncpu) |
59 | { | |
60 | if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)) | |
61 | return ncpu; | |
62 | ||
63 | /* Deactivate all but VPE 0 */ | |
64 | if (tc != 0) { | |
65 | unsigned long tmp = read_vpe_c0_vpeconf0(); | |
66 | ||
67 | tmp &= ~VPECONF0_VPA; | |
68 | ||
69 | /* master VPE */ | |
70 | tmp |= VPECONF0_MVP; | |
71 | write_vpe_c0_vpeconf0(tmp); | |
72 | ||
73 | /* Record this as available CPU */ | |
4037ac6e | 74 | set_cpu_possible(tc, true); |
c2c2a644 | 75 | set_cpu_present(tc, true); |
781b0f8d | 76 | __cpu_number_map[tc] = ++ncpu; |
70342287 | 77 | __cpu_logical_map[ncpu] = tc; |
781b0f8d RB |
78 | } |
79 | ||
80 | /* Disable multi-threading with TC's */ | |
81 | write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); | |
82 | ||
83 | if (tc != 0) | |
39b8d525 | 84 | smvp_copy_vpe_config(); |
781b0f8d RB |
85 | |
86 | return ncpu; | |
87 | } | |
88 | ||
39b8d525 | 89 | static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0) |
781b0f8d RB |
90 | { |
91 | unsigned long tmp; | |
92 | ||
93 | if (!tc) | |
94 | return; | |
95 | ||
96 | /* bind a TC to each VPE, May as well put all excess TC's | |
97 | on the last VPE */ | |
98 | if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1)) | |
99 | write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)); | |
100 | else { | |
101 | write_tc_c0_tcbind(read_tc_c0_tcbind() | tc); | |
102 | ||
103 | /* and set XTC */ | |
104 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT)); | |
105 | } | |
106 | ||
107 | tmp = read_tc_c0_tcstatus(); | |
108 | ||
109 | /* mark not allocated and not dynamically allocatable */ | |
110 | tmp &= ~(TCSTATUS_A | TCSTATUS_DA); | |
111 | tmp |= TCSTATUS_IXMT; /* interrupt exempt */ | |
112 | write_tc_c0_tcstatus(tmp); | |
113 | ||
114 | write_tc_c0_tchalt(TCHALT_H); | |
115 | } | |
116 | ||
87353d8a | 117 | static void vsmp_send_ipi_single(int cpu, unsigned int action) |
340ee4b9 | 118 | { |
87353d8a RB |
119 | int i; |
120 | unsigned long flags; | |
121 | int vpflags; | |
340ee4b9 | 122 | |
8a19b8f1 | 123 | #ifdef CONFIG_MIPS_GIC |
5cf8b240 | 124 | if (gic_present) { |
bb11cff3 | 125 | mips_smp_send_ipi_single(cpu, action); |
5cf8b240 SH |
126 | return; |
127 | } | |
128 | #endif | |
87353d8a | 129 | local_irq_save(flags); |
340ee4b9 | 130 | |
25985edc | 131 | vpflags = dvpe(); /* can't access the other CPU's registers whilst MVPE enabled */ |
340ee4b9 | 132 | |
87353d8a RB |
133 | switch (action) { |
134 | case SMP_CALL_FUNCTION: | |
135 | i = C_SW1; | |
136 | break; | |
340ee4b9 | 137 | |
87353d8a RB |
138 | case SMP_RESCHEDULE_YOURSELF: |
139 | default: | |
140 | i = C_SW0; | |
141 | break; | |
142 | } | |
340ee4b9 | 143 | |
87353d8a RB |
144 | /* 1:1 mapping of vpe and tc... */ |
145 | settc(cpu); | |
146 | write_vpe_c0_cause(read_vpe_c0_cause() | i); | |
147 | evpe(vpflags); | |
0ab7aefc | 148 | |
87353d8a RB |
149 | local_irq_restore(flags); |
150 | } | |
340ee4b9 | 151 | |
48a048fe | 152 | static void vsmp_send_ipi_mask(const struct cpumask *mask, unsigned int action) |
87353d8a RB |
153 | { |
154 | unsigned int i; | |
340ee4b9 | 155 | |
48a048fe | 156 | for_each_cpu(i, mask) |
87353d8a RB |
157 | vsmp_send_ipi_single(i, action); |
158 | } | |
340ee4b9 | 159 | |
078a55fc | 160 | static void vsmp_init_secondary(void) |
87353d8a | 161 | { |
8a19b8f1 | 162 | #ifdef CONFIG_MIPS_GIC |
d002aaad | 163 | /* This is Malta specific: IPI,performance and timer interrupts */ |
39b8d525 | 164 | if (gic_present) |
c3f134fb JH |
165 | change_c0_status(ST0_IM, STATUSF_IP2 | STATUSF_IP3 | |
166 | STATUSF_IP4 | STATUSF_IP5 | | |
39b8d525 RB |
167 | STATUSF_IP6 | STATUSF_IP7); |
168 | else | |
1c599242 | 169 | #endif |
39b8d525 RB |
170 | change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 | |
171 | STATUSF_IP6 | STATUSF_IP7); | |
41c594ab | 172 | } |
340ee4b9 | 173 | |
078a55fc | 174 | static void vsmp_smp_finish(void) |
41c594ab | 175 | { |
39b8d525 | 176 | /* CDFIXME: remove this? */ |
87353d8a | 177 | write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ)); |
340ee4b9 | 178 | |
87353d8a RB |
179 | #ifdef CONFIG_MIPS_MT_FPAFF |
180 | /* If we have an FPU, enroll ourselves in the FPU-full mask */ | |
181 | if (cpu_has_fpu) | |
8dd92891 | 182 | cpumask_set_cpu(smp_processor_id(), &mt_fpu_cpumask); |
87353d8a | 183 | #endif /* CONFIG_MIPS_MT_FPAFF */ |
340ee4b9 | 184 | |
87353d8a RB |
185 | local_irq_enable(); |
186 | } | |
340ee4b9 | 187 | |
340ee4b9 RB |
188 | /* |
189 | * Setup the PC, SP, and GP of a secondary processor and start it | |
190 | * running! | |
191 | * smp_bootstrap is the place to resume from | |
192 | * __KSTK_TOS(idle) is apparently the stack pointer | |
193 | * (unsigned long)idle->thread_info the gp | |
194 | * assumes a 1:1 mapping of TC => VPE | |
195 | */ | |
078a55fc | 196 | static void vsmp_boot_secondary(int cpu, struct task_struct *idle) |
340ee4b9 | 197 | { |
dc8f6029 | 198 | struct thread_info *gp = task_thread_info(idle); |
340ee4b9 RB |
199 | dvpe(); |
200 | set_c0_mvpcontrol(MVPCONTROL_VPC); | |
201 | ||
202 | settc(cpu); | |
203 | ||
204 | /* restart */ | |
205 | write_tc_c0_tcrestart((unsigned long)&smp_bootstrap); | |
206 | ||
207 | /* enable the tc this vpe/cpu will be running */ | |
208 | write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A); | |
209 | ||
210 | write_tc_c0_tchalt(0); | |
211 | ||
212 | /* enable the VPE */ | |
213 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); | |
214 | ||
215 | /* stack pointer */ | |
216 | write_tc_gpr_sp( __KSTK_TOS(idle)); | |
217 | ||
218 | /* global pointer */ | |
dc8f6029 | 219 | write_tc_gpr_gp((unsigned long)gp); |
340ee4b9 | 220 | |
41c594ab | 221 | flush_icache_range((unsigned long)gp, |
70342287 | 222 | (unsigned long)(gp + sizeof(struct thread_info))); |
340ee4b9 RB |
223 | |
224 | /* finally out of configuration and into chaos */ | |
225 | clear_c0_mvpcontrol(MVPCONTROL_VPC); | |
226 | ||
227 | evpe(EVPE_ENABLE); | |
228 | } | |
229 | ||
87353d8a RB |
230 | /* |
231 | * Common setup before any secondaries are started | |
232 | * Make sure all CPU's are in a sensible state before we boot any of the | |
39b8d525 | 233 | * secondaries |
87353d8a RB |
234 | */ |
235 | static void __init vsmp_smp_setup(void) | |
340ee4b9 | 236 | { |
87353d8a RB |
237 | unsigned int mvpconf0, ntc, tc, ncpu = 0; |
238 | unsigned int nvpe; | |
340ee4b9 | 239 | |
f088fc84 RB |
240 | #ifdef CONFIG_MIPS_MT_FPAFF |
241 | /* If we have an FPU, enroll ourselves in the FPU-full mask */ | |
242 | if (cpu_has_fpu) | |
8dd92891 | 243 | cpumask_set_cpu(0, &mt_fpu_cpumask); |
f088fc84 | 244 | #endif /* CONFIG_MIPS_MT_FPAFF */ |
87353d8a RB |
245 | if (!cpu_has_mipsmt) |
246 | return; | |
f088fc84 | 247 | |
87353d8a RB |
248 | /* disable MT so we can configure */ |
249 | dvpe(); | |
250 | dmt(); | |
340ee4b9 | 251 | |
87353d8a RB |
252 | /* Put MVPE's into 'configuration state' */ |
253 | set_c0_mvpcontrol(MVPCONTROL_VPC); | |
340ee4b9 | 254 | |
87353d8a RB |
255 | mvpconf0 = read_c0_mvpconf0(); |
256 | ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT; | |
340ee4b9 | 257 | |
87353d8a RB |
258 | nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1; |
259 | smp_num_siblings = nvpe; | |
340ee4b9 | 260 | |
87353d8a RB |
261 | /* we'll always have more TC's than VPE's, so loop setting everything |
262 | to a sensible state */ | |
263 | for (tc = 0; tc <= ntc; tc++) { | |
264 | settc(tc); | |
340ee4b9 | 265 | |
39b8d525 RB |
266 | smvp_tc_init(tc, mvpconf0); |
267 | ncpu = smvp_vpe_init(tc, mvpconf0, ncpu); | |
87353d8a | 268 | } |
340ee4b9 | 269 | |
87353d8a RB |
270 | /* Release config state */ |
271 | clear_c0_mvpcontrol(MVPCONTROL_VPC); | |
272 | ||
273 | /* We'll wait until starting the secondaries before starting MVPE */ | |
274 | ||
275 | printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu); | |
276 | } | |
277 | ||
278 | static void __init vsmp_prepare_cpus(unsigned int max_cpus) | |
279 | { | |
280 | mips_mt_set_cpuoptions(); | |
340ee4b9 | 281 | } |
87353d8a RB |
282 | |
283 | struct plat_smp_ops vsmp_smp_ops = { | |
284 | .send_ipi_single = vsmp_send_ipi_single, | |
285 | .send_ipi_mask = vsmp_send_ipi_mask, | |
286 | .init_secondary = vsmp_init_secondary, | |
287 | .smp_finish = vsmp_smp_finish, | |
87353d8a RB |
288 | .boot_secondary = vsmp_boot_secondary, |
289 | .smp_setup = vsmp_smp_setup, | |
290 | .prepare_cpus = vsmp_prepare_cpus, | |
291 | }; | |
d6d3c9af | 292 |