Commit | Line | Data |
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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> | |
24 | #include <linux/compiler.h> | |
0ab7aefc | 25 | #include <linux/smp.h> |
340ee4b9 | 26 | |
60063497 | 27 | #include <linux/atomic.h> |
41c594ab | 28 | #include <asm/cacheflush.h> |
340ee4b9 RB |
29 | #include <asm/cpu.h> |
30 | #include <asm/processor.h> | |
340ee4b9 RB |
31 | #include <asm/hardirq.h> |
32 | #include <asm/mmu_context.h> | |
340ee4b9 RB |
33 | #include <asm/time.h> |
34 | #include <asm/mipsregs.h> | |
35 | #include <asm/mipsmtregs.h> | |
41c594ab | 36 | #include <asm/mips_mt.h> |
ff86714f | 37 | #include <asm/gic.h> |
340ee4b9 | 38 | |
39b8d525 | 39 | static void __init smvp_copy_vpe_config(void) |
781b0f8d RB |
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()); | |
70e46f48 RB |
52 | |
53 | write_vpe_c0_count(read_c0_count()); | |
781b0f8d RB |
54 | } |
55 | ||
39b8d525 | 56 | static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0, |
781b0f8d RB |
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 */ | |
4037ac6e | 73 | set_cpu_possible(tc, true); |
c2c2a644 | 74 | set_cpu_present(tc, true); |
781b0f8d | 75 | __cpu_number_map[tc] = ++ncpu; |
70342287 | 76 | __cpu_logical_map[ncpu] = tc; |
781b0f8d RB |
77 | } |
78 | ||
79 | /* Disable multi-threading with TC's */ | |
80 | write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE); | |
81 | ||
82 | if (tc != 0) | |
39b8d525 | 83 | smvp_copy_vpe_config(); |
781b0f8d RB |
84 | |
85 | return ncpu; | |
86 | } | |
87 | ||
39b8d525 | 88 | static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0) |
781b0f8d RB |
89 | { |
90 | unsigned long tmp; | |
91 | ||
92 | if (!tc) | |
93 | return; | |
94 | ||
95 | /* bind a TC to each VPE, May as well put all excess TC's | |
96 | on the last VPE */ | |
97 | if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1)) | |
98 | write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)); | |
99 | else { | |
100 | write_tc_c0_tcbind(read_tc_c0_tcbind() | tc); | |
101 | ||
102 | /* and set XTC */ | |
103 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT)); | |
104 | } | |
105 | ||
106 | tmp = read_tc_c0_tcstatus(); | |
107 | ||
108 | /* mark not allocated and not dynamically allocatable */ | |
109 | tmp &= ~(TCSTATUS_A | TCSTATUS_DA); | |
110 | tmp |= TCSTATUS_IXMT; /* interrupt exempt */ | |
111 | write_tc_c0_tcstatus(tmp); | |
112 | ||
113 | write_tc_c0_tchalt(TCHALT_H); | |
114 | } | |
115 | ||
87353d8a | 116 | static void vsmp_send_ipi_single(int cpu, unsigned int action) |
340ee4b9 | 117 | { |
87353d8a RB |
118 | int i; |
119 | unsigned long flags; | |
120 | int vpflags; | |
340ee4b9 | 121 | |
8a19b8f1 | 122 | #ifdef CONFIG_MIPS_GIC |
5cf8b240 | 123 | if (gic_present) { |
0c2cb004 | 124 | gic_send_ipi_single(cpu, action); |
5cf8b240 SH |
125 | return; |
126 | } | |
127 | #endif | |
87353d8a | 128 | local_irq_save(flags); |
340ee4b9 | 129 | |
25985edc | 130 | vpflags = dvpe(); /* can't access the other CPU's registers whilst MVPE enabled */ |
340ee4b9 | 131 | |
87353d8a RB |
132 | switch (action) { |
133 | case SMP_CALL_FUNCTION: | |
134 | i = C_SW1; | |
135 | break; | |
340ee4b9 | 136 | |
87353d8a RB |
137 | case SMP_RESCHEDULE_YOURSELF: |
138 | default: | |
139 | i = C_SW0; | |
140 | break; | |
141 | } | |
340ee4b9 | 142 | |
87353d8a RB |
143 | /* 1:1 mapping of vpe and tc... */ |
144 | settc(cpu); | |
145 | write_vpe_c0_cause(read_vpe_c0_cause() | i); | |
146 | evpe(vpflags); | |
0ab7aefc | 147 | |
87353d8a RB |
148 | local_irq_restore(flags); |
149 | } | |
340ee4b9 | 150 | |
48a048fe | 151 | static void vsmp_send_ipi_mask(const struct cpumask *mask, unsigned int action) |
87353d8a RB |
152 | { |
153 | unsigned int i; | |
340ee4b9 | 154 | |
48a048fe | 155 | for_each_cpu(i, mask) |
87353d8a RB |
156 | vsmp_send_ipi_single(i, action); |
157 | } | |
340ee4b9 | 158 | |
078a55fc | 159 | static void vsmp_init_secondary(void) |
87353d8a | 160 | { |
8a19b8f1 | 161 | #ifdef CONFIG_MIPS_GIC |
d002aaad | 162 | /* This is Malta specific: IPI,performance and timer interrupts */ |
39b8d525 RB |
163 | if (gic_present) |
164 | change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP4 | | |
165 | STATUSF_IP6 | STATUSF_IP7); | |
166 | else | |
1c599242 | 167 | #endif |
39b8d525 RB |
168 | change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 | |
169 | STATUSF_IP6 | STATUSF_IP7); | |
41c594ab | 170 | } |
340ee4b9 | 171 | |
078a55fc | 172 | static void vsmp_smp_finish(void) |
41c594ab | 173 | { |
39b8d525 | 174 | /* CDFIXME: remove this? */ |
87353d8a | 175 | write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ)); |
340ee4b9 | 176 | |
87353d8a RB |
177 | #ifdef CONFIG_MIPS_MT_FPAFF |
178 | /* If we have an FPU, enroll ourselves in the FPU-full mask */ | |
179 | if (cpu_has_fpu) | |
180 | cpu_set(smp_processor_id(), mt_fpu_cpumask); | |
181 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
340ee4b9 | 182 | |
87353d8a RB |
183 | local_irq_enable(); |
184 | } | |
340ee4b9 | 185 | |
340ee4b9 RB |
186 | /* |
187 | * Setup the PC, SP, and GP of a secondary processor and start it | |
188 | * running! | |
189 | * smp_bootstrap is the place to resume from | |
190 | * __KSTK_TOS(idle) is apparently the stack pointer | |
191 | * (unsigned long)idle->thread_info the gp | |
192 | * assumes a 1:1 mapping of TC => VPE | |
193 | */ | |
078a55fc | 194 | static void vsmp_boot_secondary(int cpu, struct task_struct *idle) |
340ee4b9 | 195 | { |
dc8f6029 | 196 | struct thread_info *gp = task_thread_info(idle); |
340ee4b9 RB |
197 | dvpe(); |
198 | set_c0_mvpcontrol(MVPCONTROL_VPC); | |
199 | ||
200 | settc(cpu); | |
201 | ||
202 | /* restart */ | |
203 | write_tc_c0_tcrestart((unsigned long)&smp_bootstrap); | |
204 | ||
205 | /* enable the tc this vpe/cpu will be running */ | |
206 | write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A); | |
207 | ||
208 | write_tc_c0_tchalt(0); | |
209 | ||
210 | /* enable the VPE */ | |
211 | write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); | |
212 | ||
213 | /* stack pointer */ | |
214 | write_tc_gpr_sp( __KSTK_TOS(idle)); | |
215 | ||
216 | /* global pointer */ | |
dc8f6029 | 217 | write_tc_gpr_gp((unsigned long)gp); |
340ee4b9 | 218 | |
41c594ab | 219 | flush_icache_range((unsigned long)gp, |
70342287 | 220 | (unsigned long)(gp + sizeof(struct thread_info))); |
340ee4b9 RB |
221 | |
222 | /* finally out of configuration and into chaos */ | |
223 | clear_c0_mvpcontrol(MVPCONTROL_VPC); | |
224 | ||
225 | evpe(EVPE_ENABLE); | |
226 | } | |
227 | ||
87353d8a RB |
228 | /* |
229 | * Common setup before any secondaries are started | |
230 | * Make sure all CPU's are in a sensible state before we boot any of the | |
39b8d525 | 231 | * secondaries |
87353d8a RB |
232 | */ |
233 | static void __init vsmp_smp_setup(void) | |
340ee4b9 | 234 | { |
87353d8a RB |
235 | unsigned int mvpconf0, ntc, tc, ncpu = 0; |
236 | unsigned int nvpe; | |
340ee4b9 | 237 | |
f088fc84 RB |
238 | #ifdef CONFIG_MIPS_MT_FPAFF |
239 | /* If we have an FPU, enroll ourselves in the FPU-full mask */ | |
240 | if (cpu_has_fpu) | |
87353d8a | 241 | cpu_set(0, mt_fpu_cpumask); |
f088fc84 | 242 | #endif /* CONFIG_MIPS_MT_FPAFF */ |
87353d8a RB |
243 | if (!cpu_has_mipsmt) |
244 | return; | |
f088fc84 | 245 | |
87353d8a RB |
246 | /* disable MT so we can configure */ |
247 | dvpe(); | |
248 | dmt(); | |
340ee4b9 | 249 | |
87353d8a RB |
250 | /* Put MVPE's into 'configuration state' */ |
251 | set_c0_mvpcontrol(MVPCONTROL_VPC); | |
340ee4b9 | 252 | |
87353d8a RB |
253 | mvpconf0 = read_c0_mvpconf0(); |
254 | ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT; | |
340ee4b9 | 255 | |
87353d8a RB |
256 | nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1; |
257 | smp_num_siblings = nvpe; | |
340ee4b9 | 258 | |
87353d8a RB |
259 | /* we'll always have more TC's than VPE's, so loop setting everything |
260 | to a sensible state */ | |
261 | for (tc = 0; tc <= ntc; tc++) { | |
262 | settc(tc); | |
340ee4b9 | 263 | |
39b8d525 RB |
264 | smvp_tc_init(tc, mvpconf0); |
265 | ncpu = smvp_vpe_init(tc, mvpconf0, ncpu); | |
87353d8a | 266 | } |
340ee4b9 | 267 | |
87353d8a RB |
268 | /* Release config state */ |
269 | clear_c0_mvpcontrol(MVPCONTROL_VPC); | |
270 | ||
271 | /* We'll wait until starting the secondaries before starting MVPE */ | |
272 | ||
273 | printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu); | |
274 | } | |
275 | ||
276 | static void __init vsmp_prepare_cpus(unsigned int max_cpus) | |
277 | { | |
278 | mips_mt_set_cpuoptions(); | |
340ee4b9 | 279 | } |
87353d8a RB |
280 | |
281 | struct plat_smp_ops vsmp_smp_ops = { | |
282 | .send_ipi_single = vsmp_send_ipi_single, | |
283 | .send_ipi_mask = vsmp_send_ipi_mask, | |
284 | .init_secondary = vsmp_init_secondary, | |
285 | .smp_finish = vsmp_smp_finish, | |
87353d8a RB |
286 | .boot_secondary = vsmp_boot_secondary, |
287 | .smp_setup = vsmp_smp_setup, | |
288 | .prepare_cpus = vsmp_prepare_cpus, | |
289 | }; | |
d6d3c9af | 290 | |
7d907fa1 | 291 | #ifdef CONFIG_PROC_FS |
d6d3c9af RB |
292 | static int proc_cpuinfo_chain_call(struct notifier_block *nfb, |
293 | unsigned long action_unused, void *data) | |
294 | { | |
295 | struct proc_cpuinfo_notifier_args *pcn = data; | |
296 | struct seq_file *m = pcn->m; | |
297 | unsigned long n = pcn->n; | |
298 | ||
299 | if (!cpu_has_mipsmt) | |
300 | return NOTIFY_OK; | |
301 | ||
302 | seq_printf(m, "VPE\t\t\t: %d\n", cpu_data[n].vpe_id); | |
303 | ||
304 | return NOTIFY_OK; | |
305 | } | |
306 | ||
307 | static int __init proc_cpuinfo_notifier_init(void) | |
308 | { | |
309 | return proc_cpuinfo_notifier(proc_cpuinfo_chain_call, 0); | |
310 | } | |
311 | ||
312 | subsys_initcall(proc_cpuinfo_notifier_init); | |
7d907fa1 | 313 | #endif |