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MIPS: SMP: Don't increment irq_count multiple times for call function IPIs
[deliverable/linux.git] / arch / mips / loongson64 / loongson-3 / smp.c
1 /*
2 * Copyright (C) 2010, 2011, 2012, Lemote, Inc.
3 * Author: Chen Huacai, chenhc@lemote.com
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17 #include <linux/init.h>
18 #include <linux/cpu.h>
19 #include <linux/sched.h>
20 #include <linux/smp.h>
21 #include <linux/cpufreq.h>
22 #include <asm/processor.h>
23 #include <asm/time.h>
24 #include <asm/clock.h>
25 #include <asm/tlbflush.h>
26 #include <asm/cacheflush.h>
27 #include <loongson.h>
28 #include <workarounds.h>
29
30 #include "smp.h"
31
32 DEFINE_PER_CPU(int, cpu_state);
33 DEFINE_PER_CPU(uint32_t, core0_c0count);
34
35 static void *ipi_set0_regs[16];
36 static void *ipi_clear0_regs[16];
37 static void *ipi_status0_regs[16];
38 static void *ipi_en0_regs[16];
39 static void *ipi_mailbox_buf[16];
40
41 /* read a 32bit value from ipi register */
42 #define loongson3_ipi_read32(addr) readl(addr)
43 /* read a 64bit value from ipi register */
44 #define loongson3_ipi_read64(addr) readq(addr)
45 /* write a 32bit value to ipi register */
46 #define loongson3_ipi_write32(action, addr) \
47 do { \
48 writel(action, addr); \
49 __wbflush(); \
50 } while (0)
51 /* write a 64bit value to ipi register */
52 #define loongson3_ipi_write64(action, addr) \
53 do { \
54 writeq(action, addr); \
55 __wbflush(); \
56 } while (0)
57
58 static void ipi_set0_regs_init(void)
59 {
60 ipi_set0_regs[0] = (void *)
61 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + SET0);
62 ipi_set0_regs[1] = (void *)
63 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + SET0);
64 ipi_set0_regs[2] = (void *)
65 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + SET0);
66 ipi_set0_regs[3] = (void *)
67 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + SET0);
68 ipi_set0_regs[4] = (void *)
69 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + SET0);
70 ipi_set0_regs[5] = (void *)
71 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + SET0);
72 ipi_set0_regs[6] = (void *)
73 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + SET0);
74 ipi_set0_regs[7] = (void *)
75 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + SET0);
76 ipi_set0_regs[8] = (void *)
77 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + SET0);
78 ipi_set0_regs[9] = (void *)
79 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + SET0);
80 ipi_set0_regs[10] = (void *)
81 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + SET0);
82 ipi_set0_regs[11] = (void *)
83 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + SET0);
84 ipi_set0_regs[12] = (void *)
85 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + SET0);
86 ipi_set0_regs[13] = (void *)
87 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + SET0);
88 ipi_set0_regs[14] = (void *)
89 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + SET0);
90 ipi_set0_regs[15] = (void *)
91 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + SET0);
92 }
93
94 static void ipi_clear0_regs_init(void)
95 {
96 ipi_clear0_regs[0] = (void *)
97 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + CLEAR0);
98 ipi_clear0_regs[1] = (void *)
99 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + CLEAR0);
100 ipi_clear0_regs[2] = (void *)
101 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + CLEAR0);
102 ipi_clear0_regs[3] = (void *)
103 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + CLEAR0);
104 ipi_clear0_regs[4] = (void *)
105 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + CLEAR0);
106 ipi_clear0_regs[5] = (void *)
107 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + CLEAR0);
108 ipi_clear0_regs[6] = (void *)
109 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + CLEAR0);
110 ipi_clear0_regs[7] = (void *)
111 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + CLEAR0);
112 ipi_clear0_regs[8] = (void *)
113 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + CLEAR0);
114 ipi_clear0_regs[9] = (void *)
115 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + CLEAR0);
116 ipi_clear0_regs[10] = (void *)
117 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + CLEAR0);
118 ipi_clear0_regs[11] = (void *)
119 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + CLEAR0);
120 ipi_clear0_regs[12] = (void *)
121 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + CLEAR0);
122 ipi_clear0_regs[13] = (void *)
123 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + CLEAR0);
124 ipi_clear0_regs[14] = (void *)
125 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + CLEAR0);
126 ipi_clear0_regs[15] = (void *)
127 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + CLEAR0);
128 }
129
130 static void ipi_status0_regs_init(void)
131 {
132 ipi_status0_regs[0] = (void *)
133 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + STATUS0);
134 ipi_status0_regs[1] = (void *)
135 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + STATUS0);
136 ipi_status0_regs[2] = (void *)
137 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + STATUS0);
138 ipi_status0_regs[3] = (void *)
139 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + STATUS0);
140 ipi_status0_regs[4] = (void *)
141 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + STATUS0);
142 ipi_status0_regs[5] = (void *)
143 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + STATUS0);
144 ipi_status0_regs[6] = (void *)
145 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + STATUS0);
146 ipi_status0_regs[7] = (void *)
147 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + STATUS0);
148 ipi_status0_regs[8] = (void *)
149 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + STATUS0);
150 ipi_status0_regs[9] = (void *)
151 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + STATUS0);
152 ipi_status0_regs[10] = (void *)
153 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + STATUS0);
154 ipi_status0_regs[11] = (void *)
155 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + STATUS0);
156 ipi_status0_regs[12] = (void *)
157 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + STATUS0);
158 ipi_status0_regs[13] = (void *)
159 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + STATUS0);
160 ipi_status0_regs[14] = (void *)
161 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + STATUS0);
162 ipi_status0_regs[15] = (void *)
163 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + STATUS0);
164 }
165
166 static void ipi_en0_regs_init(void)
167 {
168 ipi_en0_regs[0] = (void *)
169 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + EN0);
170 ipi_en0_regs[1] = (void *)
171 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + EN0);
172 ipi_en0_regs[2] = (void *)
173 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + EN0);
174 ipi_en0_regs[3] = (void *)
175 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + EN0);
176 ipi_en0_regs[4] = (void *)
177 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + EN0);
178 ipi_en0_regs[5] = (void *)
179 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + EN0);
180 ipi_en0_regs[6] = (void *)
181 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + EN0);
182 ipi_en0_regs[7] = (void *)
183 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + EN0);
184 ipi_en0_regs[8] = (void *)
185 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + EN0);
186 ipi_en0_regs[9] = (void *)
187 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + EN0);
188 ipi_en0_regs[10] = (void *)
189 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + EN0);
190 ipi_en0_regs[11] = (void *)
191 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + EN0);
192 ipi_en0_regs[12] = (void *)
193 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + EN0);
194 ipi_en0_regs[13] = (void *)
195 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + EN0);
196 ipi_en0_regs[14] = (void *)
197 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + EN0);
198 ipi_en0_regs[15] = (void *)
199 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + EN0);
200 }
201
202 static void ipi_mailbox_buf_init(void)
203 {
204 ipi_mailbox_buf[0] = (void *)
205 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + BUF);
206 ipi_mailbox_buf[1] = (void *)
207 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + BUF);
208 ipi_mailbox_buf[2] = (void *)
209 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + BUF);
210 ipi_mailbox_buf[3] = (void *)
211 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + BUF);
212 ipi_mailbox_buf[4] = (void *)
213 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + BUF);
214 ipi_mailbox_buf[5] = (void *)
215 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + BUF);
216 ipi_mailbox_buf[6] = (void *)
217 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + BUF);
218 ipi_mailbox_buf[7] = (void *)
219 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + BUF);
220 ipi_mailbox_buf[8] = (void *)
221 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + BUF);
222 ipi_mailbox_buf[9] = (void *)
223 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + BUF);
224 ipi_mailbox_buf[10] = (void *)
225 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + BUF);
226 ipi_mailbox_buf[11] = (void *)
227 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + BUF);
228 ipi_mailbox_buf[12] = (void *)
229 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + BUF);
230 ipi_mailbox_buf[13] = (void *)
231 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + BUF);
232 ipi_mailbox_buf[14] = (void *)
233 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + BUF);
234 ipi_mailbox_buf[15] = (void *)
235 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + BUF);
236 }
237
238 /*
239 * Simple enough, just poke the appropriate ipi register
240 */
241 static void loongson3_send_ipi_single(int cpu, unsigned int action)
242 {
243 loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu_logical_map(cpu)]);
244 }
245
246 static void
247 loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
248 {
249 unsigned int i;
250
251 for_each_cpu(i, mask)
252 loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu_logical_map(i)]);
253 }
254
255 void loongson3_ipi_interrupt(struct pt_regs *regs)
256 {
257 int i, cpu = smp_processor_id();
258 unsigned int action, c0count;
259
260 /* Load the ipi register to figure out what we're supposed to do */
261 action = loongson3_ipi_read32(ipi_status0_regs[cpu_logical_map(cpu)]);
262
263 /* Clear the ipi register to clear the interrupt */
264 loongson3_ipi_write32((u32)action, ipi_clear0_regs[cpu_logical_map(cpu)]);
265
266 if (action & SMP_RESCHEDULE_YOURSELF)
267 scheduler_ipi();
268
269 if (action & SMP_CALL_FUNCTION) {
270 irq_enter();
271 generic_smp_call_function_interrupt();
272 irq_exit();
273 }
274
275 if (action & SMP_ASK_C0COUNT) {
276 BUG_ON(cpu != 0);
277 c0count = read_c0_count();
278 for (i = 1; i < num_possible_cpus(); i++)
279 per_cpu(core0_c0count, i) = c0count;
280 }
281 }
282
283 #define MAX_LOOPS 1111
284 /*
285 * SMP init and finish on secondary CPUs
286 */
287 static void loongson3_init_secondary(void)
288 {
289 int i;
290 uint32_t initcount;
291 unsigned int cpu = smp_processor_id();
292 unsigned int imask = STATUSF_IP7 | STATUSF_IP6 |
293 STATUSF_IP3 | STATUSF_IP2;
294
295 /* Set interrupt mask, but don't enable */
296 change_c0_status(ST0_IM, imask);
297
298 for (i = 0; i < num_possible_cpus(); i++)
299 loongson3_ipi_write32(0xffffffff, ipi_en0_regs[cpu_logical_map(i)]);
300
301 per_cpu(cpu_state, cpu) = CPU_ONLINE;
302 cpu_data[cpu].core =
303 cpu_logical_map(cpu) % loongson_sysconf.cores_per_package;
304 cpu_data[cpu].package =
305 cpu_logical_map(cpu) / loongson_sysconf.cores_per_package;
306
307 i = 0;
308 __this_cpu_write(core0_c0count, 0);
309 loongson3_send_ipi_single(0, SMP_ASK_C0COUNT);
310 while (!__this_cpu_read(core0_c0count)) {
311 i++;
312 cpu_relax();
313 }
314
315 if (i > MAX_LOOPS)
316 i = MAX_LOOPS;
317 initcount = __this_cpu_read(core0_c0count) + i;
318 write_c0_count(initcount);
319 }
320
321 static void loongson3_smp_finish(void)
322 {
323 int cpu = smp_processor_id();
324
325 write_c0_compare(read_c0_count() + mips_hpt_frequency/HZ);
326 local_irq_enable();
327 loongson3_ipi_write64(0,
328 (void *)(ipi_mailbox_buf[cpu_logical_map(cpu)]+0x0));
329 pr_info("CPU#%d finished, CP0_ST=%x\n",
330 smp_processor_id(), read_c0_status());
331 }
332
333 static void __init loongson3_smp_setup(void)
334 {
335 int i = 0, num = 0; /* i: physical id, num: logical id */
336
337 init_cpu_possible(cpu_none_mask);
338
339 /* For unified kernel, NR_CPUS is the maximum possible value,
340 * loongson_sysconf.nr_cpus is the really present value */
341 while (i < loongson_sysconf.nr_cpus) {
342 if (loongson_sysconf.reserved_cpus_mask & (1<<i)) {
343 /* Reserved physical CPU cores */
344 __cpu_number_map[i] = -1;
345 } else {
346 __cpu_number_map[i] = num;
347 __cpu_logical_map[num] = i;
348 set_cpu_possible(num, true);
349 num++;
350 }
351 i++;
352 }
353 pr_info("Detected %i available CPU(s)\n", num);
354
355 while (num < loongson_sysconf.nr_cpus) {
356 __cpu_logical_map[num] = -1;
357 num++;
358 }
359
360 ipi_set0_regs_init();
361 ipi_clear0_regs_init();
362 ipi_status0_regs_init();
363 ipi_en0_regs_init();
364 ipi_mailbox_buf_init();
365 cpu_data[0].core = cpu_logical_map(0) % loongson_sysconf.cores_per_package;
366 cpu_data[0].package = cpu_logical_map(0) / loongson_sysconf.cores_per_package;
367 }
368
369 static void __init loongson3_prepare_cpus(unsigned int max_cpus)
370 {
371 init_cpu_present(cpu_possible_mask);
372 per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
373 }
374
375 /*
376 * Setup the PC, SP, and GP of a secondary processor and start it runing!
377 */
378 static void loongson3_boot_secondary(int cpu, struct task_struct *idle)
379 {
380 unsigned long startargs[4];
381
382 pr_info("Booting CPU#%d...\n", cpu);
383
384 /* startargs[] are initial PC, SP and GP for secondary CPU */
385 startargs[0] = (unsigned long)&smp_bootstrap;
386 startargs[1] = (unsigned long)__KSTK_TOS(idle);
387 startargs[2] = (unsigned long)task_thread_info(idle);
388 startargs[3] = 0;
389
390 pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n",
391 cpu, startargs[0], startargs[1], startargs[2]);
392
393 loongson3_ipi_write64(startargs[3],
394 (void *)(ipi_mailbox_buf[cpu_logical_map(cpu)]+0x18));
395 loongson3_ipi_write64(startargs[2],
396 (void *)(ipi_mailbox_buf[cpu_logical_map(cpu)]+0x10));
397 loongson3_ipi_write64(startargs[1],
398 (void *)(ipi_mailbox_buf[cpu_logical_map(cpu)]+0x8));
399 loongson3_ipi_write64(startargs[0],
400 (void *)(ipi_mailbox_buf[cpu_logical_map(cpu)]+0x0));
401 }
402
403 #ifdef CONFIG_HOTPLUG_CPU
404
405 static int loongson3_cpu_disable(void)
406 {
407 unsigned long flags;
408 unsigned int cpu = smp_processor_id();
409
410 if (cpu == 0)
411 return -EBUSY;
412
413 set_cpu_online(cpu, false);
414 cpumask_clear_cpu(cpu, &cpu_callin_map);
415 local_irq_save(flags);
416 fixup_irqs();
417 local_irq_restore(flags);
418 flush_cache_all();
419 local_flush_tlb_all();
420
421 return 0;
422 }
423
424
425 static void loongson3_cpu_die(unsigned int cpu)
426 {
427 while (per_cpu(cpu_state, cpu) != CPU_DEAD)
428 cpu_relax();
429
430 mb();
431 }
432
433 /* To shutdown a core in Loongson 3, the target core should go to CKSEG1 and
434 * flush all L1 entries at first. Then, another core (usually Core 0) can
435 * safely disable the clock of the target core. loongson3_play_dead() is
436 * called via CKSEG1 (uncached and unmmaped) */
437 static void loongson3a_play_dead(int *state_addr)
438 {
439 register int val;
440 register long cpuid, core, node, count;
441 register void *addr, *base, *initfunc;
442
443 __asm__ __volatile__(
444 " .set push \n"
445 " .set noreorder \n"
446 " li %[addr], 0x80000000 \n" /* KSEG0 */
447 "1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */
448 " cache 0, 1(%[addr]) \n"
449 " cache 0, 2(%[addr]) \n"
450 " cache 0, 3(%[addr]) \n"
451 " cache 1, 0(%[addr]) \n" /* flush L1 DCache */
452 " cache 1, 1(%[addr]) \n"
453 " cache 1, 2(%[addr]) \n"
454 " cache 1, 3(%[addr]) \n"
455 " addiu %[sets], %[sets], -1 \n"
456 " bnez %[sets], 1b \n"
457 " addiu %[addr], %[addr], 0x20 \n"
458 " li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */
459 " sw %[val], (%[state_addr]) \n"
460 " sync \n"
461 " cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */
462 " .set pop \n"
463 : [addr] "=&r" (addr), [val] "=&r" (val)
464 : [state_addr] "r" (state_addr),
465 [sets] "r" (cpu_data[smp_processor_id()].dcache.sets));
466
467 __asm__ __volatile__(
468 " .set push \n"
469 " .set noreorder \n"
470 " .set mips64 \n"
471 " mfc0 %[cpuid], $15, 1 \n"
472 " andi %[cpuid], 0x3ff \n"
473 " dli %[base], 0x900000003ff01000 \n"
474 " andi %[core], %[cpuid], 0x3 \n"
475 " sll %[core], 8 \n" /* get core id */
476 " or %[base], %[base], %[core] \n"
477 " andi %[node], %[cpuid], 0xc \n"
478 " dsll %[node], 42 \n" /* get node id */
479 " or %[base], %[base], %[node] \n"
480 "1: li %[count], 0x100 \n" /* wait for init loop */
481 "2: bnez %[count], 2b \n" /* limit mailbox access */
482 " addiu %[count], -1 \n"
483 " ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */
484 " beqz %[initfunc], 1b \n"
485 " nop \n"
486 " ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */
487 " ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */
488 " ld $a1, 0x38(%[base]) \n"
489 " jr %[initfunc] \n" /* jump to initial PC */
490 " nop \n"
491 " .set pop \n"
492 : [core] "=&r" (core), [node] "=&r" (node),
493 [base] "=&r" (base), [cpuid] "=&r" (cpuid),
494 [count] "=&r" (count), [initfunc] "=&r" (initfunc)
495 : /* No Input */
496 : "a1");
497 }
498
499 static void loongson3b_play_dead(int *state_addr)
500 {
501 register int val;
502 register long cpuid, core, node, count;
503 register void *addr, *base, *initfunc;
504
505 __asm__ __volatile__(
506 " .set push \n"
507 " .set noreorder \n"
508 " li %[addr], 0x80000000 \n" /* KSEG0 */
509 "1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */
510 " cache 0, 1(%[addr]) \n"
511 " cache 0, 2(%[addr]) \n"
512 " cache 0, 3(%[addr]) \n"
513 " cache 1, 0(%[addr]) \n" /* flush L1 DCache */
514 " cache 1, 1(%[addr]) \n"
515 " cache 1, 2(%[addr]) \n"
516 " cache 1, 3(%[addr]) \n"
517 " addiu %[sets], %[sets], -1 \n"
518 " bnez %[sets], 1b \n"
519 " addiu %[addr], %[addr], 0x20 \n"
520 " li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */
521 " sw %[val], (%[state_addr]) \n"
522 " sync \n"
523 " cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */
524 " .set pop \n"
525 : [addr] "=&r" (addr), [val] "=&r" (val)
526 : [state_addr] "r" (state_addr),
527 [sets] "r" (cpu_data[smp_processor_id()].dcache.sets));
528
529 __asm__ __volatile__(
530 " .set push \n"
531 " .set noreorder \n"
532 " .set mips64 \n"
533 " mfc0 %[cpuid], $15, 1 \n"
534 " andi %[cpuid], 0x3ff \n"
535 " dli %[base], 0x900000003ff01000 \n"
536 " andi %[core], %[cpuid], 0x3 \n"
537 " sll %[core], 8 \n" /* get core id */
538 " or %[base], %[base], %[core] \n"
539 " andi %[node], %[cpuid], 0xc \n"
540 " dsll %[node], 42 \n" /* get node id */
541 " or %[base], %[base], %[node] \n"
542 " dsrl %[node], 30 \n" /* 15:14 */
543 " or %[base], %[base], %[node] \n"
544 "1: li %[count], 0x100 \n" /* wait for init loop */
545 "2: bnez %[count], 2b \n" /* limit mailbox access */
546 " addiu %[count], -1 \n"
547 " ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */
548 " beqz %[initfunc], 1b \n"
549 " nop \n"
550 " ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */
551 " ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */
552 " ld $a1, 0x38(%[base]) \n"
553 " jr %[initfunc] \n" /* jump to initial PC */
554 " nop \n"
555 " .set pop \n"
556 : [core] "=&r" (core), [node] "=&r" (node),
557 [base] "=&r" (base), [cpuid] "=&r" (cpuid),
558 [count] "=&r" (count), [initfunc] "=&r" (initfunc)
559 : /* No Input */
560 : "a1");
561 }
562
563 void play_dead(void)
564 {
565 int *state_addr;
566 unsigned int cpu = smp_processor_id();
567 void (*play_dead_at_ckseg1)(int *);
568
569 idle_task_exit();
570 switch (loongson_sysconf.cputype) {
571 case Loongson_3A:
572 default:
573 play_dead_at_ckseg1 =
574 (void *)CKSEG1ADDR((unsigned long)loongson3a_play_dead);
575 break;
576 case Loongson_3B:
577 play_dead_at_ckseg1 =
578 (void *)CKSEG1ADDR((unsigned long)loongson3b_play_dead);
579 break;
580 }
581 state_addr = &per_cpu(cpu_state, cpu);
582 mb();
583 play_dead_at_ckseg1(state_addr);
584 }
585
586 void loongson3_disable_clock(int cpu)
587 {
588 uint64_t core_id = cpu_data[cpu].core;
589 uint64_t package_id = cpu_data[cpu].package;
590
591 if (loongson_sysconf.cputype == Loongson_3A) {
592 LOONGSON_CHIPCFG(package_id) &= ~(1 << (12 + core_id));
593 } else if (loongson_sysconf.cputype == Loongson_3B) {
594 if (!(loongson_sysconf.workarounds & WORKAROUND_CPUHOTPLUG))
595 LOONGSON_FREQCTRL(package_id) &= ~(1 << (core_id * 4 + 3));
596 }
597 }
598
599 void loongson3_enable_clock(int cpu)
600 {
601 uint64_t core_id = cpu_data[cpu].core;
602 uint64_t package_id = cpu_data[cpu].package;
603
604 if (loongson_sysconf.cputype == Loongson_3A) {
605 LOONGSON_CHIPCFG(package_id) |= 1 << (12 + core_id);
606 } else if (loongson_sysconf.cputype == Loongson_3B) {
607 if (!(loongson_sysconf.workarounds & WORKAROUND_CPUHOTPLUG))
608 LOONGSON_FREQCTRL(package_id) |= 1 << (core_id * 4 + 3);
609 }
610 }
611
612 #define CPU_POST_DEAD_FROZEN (CPU_POST_DEAD | CPU_TASKS_FROZEN)
613 static int loongson3_cpu_callback(struct notifier_block *nfb,
614 unsigned long action, void *hcpu)
615 {
616 unsigned int cpu = (unsigned long)hcpu;
617
618 switch (action) {
619 case CPU_POST_DEAD:
620 case CPU_POST_DEAD_FROZEN:
621 pr_info("Disable clock for CPU#%d\n", cpu);
622 loongson3_disable_clock(cpu);
623 break;
624 case CPU_UP_PREPARE:
625 case CPU_UP_PREPARE_FROZEN:
626 pr_info("Enable clock for CPU#%d\n", cpu);
627 loongson3_enable_clock(cpu);
628 break;
629 }
630
631 return NOTIFY_OK;
632 }
633
634 static int register_loongson3_notifier(void)
635 {
636 hotcpu_notifier(loongson3_cpu_callback, 0);
637 return 0;
638 }
639 early_initcall(register_loongson3_notifier);
640
641 #endif
642
643 struct plat_smp_ops loongson3_smp_ops = {
644 .send_ipi_single = loongson3_send_ipi_single,
645 .send_ipi_mask = loongson3_send_ipi_mask,
646 .init_secondary = loongson3_init_secondary,
647 .smp_finish = loongson3_smp_finish,
648 .boot_secondary = loongson3_boot_secondary,
649 .smp_setup = loongson3_smp_setup,
650 .prepare_cpus = loongson3_prepare_cpus,
651 #ifdef CONFIG_HOTPLUG_CPU
652 .cpu_disable = loongson3_cpu_disable,
653 .cpu_die = loongson3_cpu_die,
654 #endif
655 };
Linux kernel - Deliverables
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