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