1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2010, 2011, 2012, Lemote, Inc. 4 * Author: Chen Huacai, chenhc@lemote.com 5 */ 6 7 #include <irq.h> 8 #include <linux/init.h> 9 #include <linux/cpu.h> 10 #include <linux/sched.h> 11 #include <linux/sched/hotplug.h> 12 #include <linux/sched/task_stack.h> 13 #include <linux/smp.h> 14 #include <linux/cpufreq.h> 15 #include <linux/kexec.h> 16 #include <asm/processor.h> 17 #include <asm/time.h> 18 #include <asm/tlbflush.h> 19 #include <asm/cacheflush.h> 20 #include <loongson.h> 21 #include <loongson_regs.h> 22 #include <workarounds.h> 23 24 #include "smp.h" 25 26 DEFINE_PER_CPU(int, cpu_state); 27 28 #define LS_IPI_IRQ (MIPS_CPU_IRQ_BASE + 6) 29 30 static void *ipi_set0_regs[16]; 31 static void *ipi_clear0_regs[16]; 32 static void *ipi_status0_regs[16]; 33 static void *ipi_en0_regs[16]; 34 static void *ipi_mailbox_buf[16]; 35 static uint32_t core0_c0count[NR_CPUS]; 36 37 /* read a 32bit value from ipi register */ 38 #define loongson3_ipi_read32(addr) readl(addr) 39 /* read a 64bit value from ipi register */ 40 #define loongson3_ipi_read64(addr) readq(addr) 41 /* write a 32bit value to ipi register */ 42 #define loongson3_ipi_write32(action, addr) \ 43 do { \ 44 writel(action, addr); \ 45 __wbflush(); \ 46 } while (0) 47 /* write a 64bit value to ipi register */ 48 #define loongson3_ipi_write64(action, addr) \ 49 do { \ 50 writeq(action, addr); \ 51 __wbflush(); \ 52 } while (0) 53 54 static u32 (*ipi_read_clear)(int cpu); 55 static void (*ipi_write_action)(int cpu, u32 action); 56 static void (*ipi_write_enable)(int cpu); 57 static void (*ipi_clear_buf)(int cpu); 58 static void (*ipi_write_buf)(int cpu, struct task_struct *idle); 59 60 /* send mail via Mail_Send register for 3A4000+ CPU */ 61 static void csr_mail_send(uint64_t data, int cpu, int mailbox) 62 { 63 uint64_t val; 64 65 /* send high 32 bits */ 66 val = CSR_MAIL_SEND_BLOCK; 67 val |= (CSR_MAIL_SEND_BOX_HIGH(mailbox) << CSR_MAIL_SEND_BOX_SHIFT); 68 val |= (cpu << CSR_MAIL_SEND_CPU_SHIFT); 69 val |= (data & CSR_MAIL_SEND_H32_MASK); 70 csr_writeq(val, LOONGSON_CSR_MAIL_SEND); 71 72 /* send low 32 bits */ 73 val = CSR_MAIL_SEND_BLOCK; 74 val |= (CSR_MAIL_SEND_BOX_LOW(mailbox) << CSR_MAIL_SEND_BOX_SHIFT); 75 val |= (cpu << CSR_MAIL_SEND_CPU_SHIFT); 76 val |= (data << CSR_MAIL_SEND_BUF_SHIFT); 77 csr_writeq(val, LOONGSON_CSR_MAIL_SEND); 78 }; 79 80 static u32 csr_ipi_read_clear(int cpu) 81 { 82 u32 action; 83 84 /* Load the ipi register to figure out what we're supposed to do */ 85 action = csr_readl(LOONGSON_CSR_IPI_STATUS); 86 /* Clear the ipi register to clear the interrupt */ 87 csr_writel(action, LOONGSON_CSR_IPI_CLEAR); 88 89 return action; 90 } 91 92 static void csr_ipi_write_action(int cpu, u32 action) 93 { 94 unsigned int irq = 0; 95 96 while ((irq = ffs(action))) { 97 uint32_t val = CSR_IPI_SEND_BLOCK; 98 val |= (irq - 1); 99 val |= (cpu << CSR_IPI_SEND_CPU_SHIFT); 100 csr_writel(val, LOONGSON_CSR_IPI_SEND); 101 action &= ~BIT(irq - 1); 102 } 103 } 104 105 static void csr_ipi_write_enable(int cpu) 106 { 107 csr_writel(0xffffffff, LOONGSON_CSR_IPI_EN); 108 } 109 110 static void csr_ipi_clear_buf(int cpu) 111 { 112 csr_writeq(0, LOONGSON_CSR_MAIL_BUF0); 113 } 114 115 static void csr_ipi_write_buf(int cpu, struct task_struct *idle) 116 { 117 unsigned long startargs[4]; 118 119 /* startargs[] are initial PC, SP and GP for secondary CPU */ 120 startargs[0] = (unsigned long)&smp_bootstrap; 121 startargs[1] = (unsigned long)__KSTK_TOS(idle); 122 startargs[2] = (unsigned long)task_thread_info(idle); 123 startargs[3] = 0; 124 125 pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n", 126 cpu, startargs[0], startargs[1], startargs[2]); 127 128 csr_mail_send(startargs[3], cpu_logical_map(cpu), 3); 129 csr_mail_send(startargs[2], cpu_logical_map(cpu), 2); 130 csr_mail_send(startargs[1], cpu_logical_map(cpu), 1); 131 csr_mail_send(startargs[0], cpu_logical_map(cpu), 0); 132 } 133 134 static u32 legacy_ipi_read_clear(int cpu) 135 { 136 u32 action; 137 138 /* Load the ipi register to figure out what we're supposed to do */ 139 action = loongson3_ipi_read32(ipi_status0_regs[cpu_logical_map(cpu)]); 140 /* Clear the ipi register to clear the interrupt */ 141 loongson3_ipi_write32(action, ipi_clear0_regs[cpu_logical_map(cpu)]); 142 143 return action; 144 } 145 146 static void legacy_ipi_write_action(int cpu, u32 action) 147 { 148 loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu]); 149 } 150 151 static void legacy_ipi_write_enable(int cpu) 152 { 153 loongson3_ipi_write32(0xffffffff, ipi_en0_regs[cpu_logical_map(cpu)]); 154 } 155 156 static void legacy_ipi_clear_buf(int cpu) 157 { 158 loongson3_ipi_write64(0, ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x0); 159 } 160 161 static void legacy_ipi_write_buf(int cpu, struct task_struct *idle) 162 { 163 unsigned long startargs[4]; 164 165 /* startargs[] are initial PC, SP and GP for secondary CPU */ 166 startargs[0] = (unsigned long)&smp_bootstrap; 167 startargs[1] = (unsigned long)__KSTK_TOS(idle); 168 startargs[2] = (unsigned long)task_thread_info(idle); 169 startargs[3] = 0; 170 171 pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n", 172 cpu, startargs[0], startargs[1], startargs[2]); 173 174 loongson3_ipi_write64(startargs[3], 175 ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x18); 176 loongson3_ipi_write64(startargs[2], 177 ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x10); 178 loongson3_ipi_write64(startargs[1], 179 ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x8); 180 loongson3_ipi_write64(startargs[0], 181 ipi_mailbox_buf[cpu_logical_map(cpu)] + 0x0); 182 } 183 184 static void csr_ipi_probe(void) 185 { 186 if (cpu_has_csr() && csr_readl(LOONGSON_CSR_FEATURES) & LOONGSON_CSRF_IPI) { 187 ipi_read_clear = csr_ipi_read_clear; 188 ipi_write_action = csr_ipi_write_action; 189 ipi_write_enable = csr_ipi_write_enable; 190 ipi_clear_buf = csr_ipi_clear_buf; 191 ipi_write_buf = csr_ipi_write_buf; 192 } else { 193 ipi_read_clear = legacy_ipi_read_clear; 194 ipi_write_action = legacy_ipi_write_action; 195 ipi_write_enable = legacy_ipi_write_enable; 196 ipi_clear_buf = legacy_ipi_clear_buf; 197 ipi_write_buf = legacy_ipi_write_buf; 198 } 199 } 200 201 static void ipi_set0_regs_init(void) 202 { 203 ipi_set0_regs[0] = (void *) 204 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + SET0); 205 ipi_set0_regs[1] = (void *) 206 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + SET0); 207 ipi_set0_regs[2] = (void *) 208 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + SET0); 209 ipi_set0_regs[3] = (void *) 210 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + SET0); 211 ipi_set0_regs[4] = (void *) 212 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + SET0); 213 ipi_set0_regs[5] = (void *) 214 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + SET0); 215 ipi_set0_regs[6] = (void *) 216 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + SET0); 217 ipi_set0_regs[7] = (void *) 218 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + SET0); 219 ipi_set0_regs[8] = (void *) 220 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + SET0); 221 ipi_set0_regs[9] = (void *) 222 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + SET0); 223 ipi_set0_regs[10] = (void *) 224 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + SET0); 225 ipi_set0_regs[11] = (void *) 226 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + SET0); 227 ipi_set0_regs[12] = (void *) 228 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + SET0); 229 ipi_set0_regs[13] = (void *) 230 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + SET0); 231 ipi_set0_regs[14] = (void *) 232 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + SET0); 233 ipi_set0_regs[15] = (void *) 234 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + SET0); 235 } 236 237 static void ipi_clear0_regs_init(void) 238 { 239 ipi_clear0_regs[0] = (void *) 240 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + CLEAR0); 241 ipi_clear0_regs[1] = (void *) 242 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + CLEAR0); 243 ipi_clear0_regs[2] = (void *) 244 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + CLEAR0); 245 ipi_clear0_regs[3] = (void *) 246 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + CLEAR0); 247 ipi_clear0_regs[4] = (void *) 248 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + CLEAR0); 249 ipi_clear0_regs[5] = (void *) 250 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + CLEAR0); 251 ipi_clear0_regs[6] = (void *) 252 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + CLEAR0); 253 ipi_clear0_regs[7] = (void *) 254 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + CLEAR0); 255 ipi_clear0_regs[8] = (void *) 256 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + CLEAR0); 257 ipi_clear0_regs[9] = (void *) 258 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + CLEAR0); 259 ipi_clear0_regs[10] = (void *) 260 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + CLEAR0); 261 ipi_clear0_regs[11] = (void *) 262 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + CLEAR0); 263 ipi_clear0_regs[12] = (void *) 264 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + CLEAR0); 265 ipi_clear0_regs[13] = (void *) 266 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + CLEAR0); 267 ipi_clear0_regs[14] = (void *) 268 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + CLEAR0); 269 ipi_clear0_regs[15] = (void *) 270 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + CLEAR0); 271 } 272 273 static void ipi_status0_regs_init(void) 274 { 275 ipi_status0_regs[0] = (void *) 276 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + STATUS0); 277 ipi_status0_regs[1] = (void *) 278 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + STATUS0); 279 ipi_status0_regs[2] = (void *) 280 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + STATUS0); 281 ipi_status0_regs[3] = (void *) 282 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + STATUS0); 283 ipi_status0_regs[4] = (void *) 284 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + STATUS0); 285 ipi_status0_regs[5] = (void *) 286 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + STATUS0); 287 ipi_status0_regs[6] = (void *) 288 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + STATUS0); 289 ipi_status0_regs[7] = (void *) 290 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + STATUS0); 291 ipi_status0_regs[8] = (void *) 292 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + STATUS0); 293 ipi_status0_regs[9] = (void *) 294 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + STATUS0); 295 ipi_status0_regs[10] = (void *) 296 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + STATUS0); 297 ipi_status0_regs[11] = (void *) 298 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + STATUS0); 299 ipi_status0_regs[12] = (void *) 300 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + STATUS0); 301 ipi_status0_regs[13] = (void *) 302 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + STATUS0); 303 ipi_status0_regs[14] = (void *) 304 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + STATUS0); 305 ipi_status0_regs[15] = (void *) 306 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + STATUS0); 307 } 308 309 static void ipi_en0_regs_init(void) 310 { 311 ipi_en0_regs[0] = (void *) 312 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + EN0); 313 ipi_en0_regs[1] = (void *) 314 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + EN0); 315 ipi_en0_regs[2] = (void *) 316 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + EN0); 317 ipi_en0_regs[3] = (void *) 318 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + EN0); 319 ipi_en0_regs[4] = (void *) 320 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + EN0); 321 ipi_en0_regs[5] = (void *) 322 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + EN0); 323 ipi_en0_regs[6] = (void *) 324 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + EN0); 325 ipi_en0_regs[7] = (void *) 326 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + EN0); 327 ipi_en0_regs[8] = (void *) 328 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + EN0); 329 ipi_en0_regs[9] = (void *) 330 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + EN0); 331 ipi_en0_regs[10] = (void *) 332 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + EN0); 333 ipi_en0_regs[11] = (void *) 334 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + EN0); 335 ipi_en0_regs[12] = (void *) 336 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + EN0); 337 ipi_en0_regs[13] = (void *) 338 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + EN0); 339 ipi_en0_regs[14] = (void *) 340 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + EN0); 341 ipi_en0_regs[15] = (void *) 342 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + EN0); 343 } 344 345 static void ipi_mailbox_buf_init(void) 346 { 347 ipi_mailbox_buf[0] = (void *) 348 (SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + BUF); 349 ipi_mailbox_buf[1] = (void *) 350 (SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + BUF); 351 ipi_mailbox_buf[2] = (void *) 352 (SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + BUF); 353 ipi_mailbox_buf[3] = (void *) 354 (SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + BUF); 355 ipi_mailbox_buf[4] = (void *) 356 (SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + BUF); 357 ipi_mailbox_buf[5] = (void *) 358 (SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + BUF); 359 ipi_mailbox_buf[6] = (void *) 360 (SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + BUF); 361 ipi_mailbox_buf[7] = (void *) 362 (SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + BUF); 363 ipi_mailbox_buf[8] = (void *) 364 (SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + BUF); 365 ipi_mailbox_buf[9] = (void *) 366 (SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + BUF); 367 ipi_mailbox_buf[10] = (void *) 368 (SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + BUF); 369 ipi_mailbox_buf[11] = (void *) 370 (SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + BUF); 371 ipi_mailbox_buf[12] = (void *) 372 (SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + BUF); 373 ipi_mailbox_buf[13] = (void *) 374 (SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + BUF); 375 ipi_mailbox_buf[14] = (void *) 376 (SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + BUF); 377 ipi_mailbox_buf[15] = (void *) 378 (SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + BUF); 379 } 380 381 /* 382 * Simple enough, just poke the appropriate ipi register 383 */ 384 static void loongson3_send_ipi_single(int cpu, unsigned int action) 385 { 386 ipi_write_action(cpu_logical_map(cpu), (u32)action); 387 } 388 389 static void 390 loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action) 391 { 392 unsigned int i; 393 394 for_each_cpu(i, mask) 395 ipi_write_action(cpu_logical_map(i), (u32)action); 396 } 397 398 399 static irqreturn_t loongson3_ipi_interrupt(int irq, void *dev_id) 400 { 401 int i, cpu = smp_processor_id(); 402 unsigned int action, c0count; 403 404 action = ipi_read_clear(cpu); 405 406 if (action & SMP_RESCHEDULE_YOURSELF) 407 scheduler_ipi(); 408 409 if (action & SMP_CALL_FUNCTION) { 410 irq_enter(); 411 generic_smp_call_function_interrupt(); 412 irq_exit(); 413 } 414 415 if (action & SMP_ASK_C0COUNT) { 416 BUG_ON(cpu != 0); 417 c0count = read_c0_count(); 418 c0count = c0count ? c0count : 1; 419 for (i = 1; i < nr_cpu_ids; i++) 420 core0_c0count[i] = c0count; 421 __wbflush(); /* Let others see the result ASAP */ 422 } 423 424 return IRQ_HANDLED; 425 } 426 427 #define MAX_LOOPS 800 428 /* 429 * SMP init and finish on secondary CPUs 430 */ 431 static void loongson3_init_secondary(void) 432 { 433 int i; 434 uint32_t initcount; 435 unsigned int cpu = smp_processor_id(); 436 unsigned int imask = STATUSF_IP7 | STATUSF_IP6 | 437 STATUSF_IP3 | STATUSF_IP2; 438 439 /* Set interrupt mask, but don't enable */ 440 change_c0_status(ST0_IM, imask); 441 ipi_write_enable(cpu); 442 443 per_cpu(cpu_state, cpu) = CPU_ONLINE; 444 cpu_set_core(&cpu_data[cpu], 445 cpu_logical_map(cpu) % loongson_sysconf.cores_per_package); 446 cpu_data[cpu].package = 447 cpu_logical_map(cpu) / loongson_sysconf.cores_per_package; 448 449 i = 0; 450 core0_c0count[cpu] = 0; 451 loongson3_send_ipi_single(0, SMP_ASK_C0COUNT); 452 while (!core0_c0count[cpu]) { 453 i++; 454 cpu_relax(); 455 } 456 457 if (i > MAX_LOOPS) 458 i = MAX_LOOPS; 459 if (cpu_data[cpu].package) 460 initcount = core0_c0count[cpu] + i; 461 else /* Local access is faster for loops */ 462 initcount = core0_c0count[cpu] + i/2; 463 464 write_c0_count(initcount); 465 } 466 467 static void loongson3_smp_finish(void) 468 { 469 int cpu = smp_processor_id(); 470 471 write_c0_compare(read_c0_count() + mips_hpt_frequency/HZ); 472 local_irq_enable(); 473 ipi_clear_buf(cpu); 474 475 pr_info("CPU#%d finished, CP0_ST=%x\n", 476 smp_processor_id(), read_c0_status()); 477 } 478 479 static void __init loongson3_smp_setup(void) 480 { 481 int i = 0, num = 0; /* i: physical id, num: logical id */ 482 483 init_cpu_possible(cpu_none_mask); 484 485 /* For unified kernel, NR_CPUS is the maximum possible value, 486 * loongson_sysconf.nr_cpus is the really present value 487 */ 488 while (i < loongson_sysconf.nr_cpus) { 489 if (loongson_sysconf.reserved_cpus_mask & (1<<i)) { 490 /* Reserved physical CPU cores */ 491 __cpu_number_map[i] = -1; 492 } else { 493 __cpu_number_map[i] = num; 494 __cpu_logical_map[num] = i; 495 set_cpu_possible(num, true); 496 /* Loongson processors are always grouped by 4 */ 497 cpu_set_cluster(&cpu_data[num], i / 4); 498 num++; 499 } 500 i++; 501 } 502 pr_info("Detected %i available CPU(s)\n", num); 503 504 while (num < loongson_sysconf.nr_cpus) { 505 __cpu_logical_map[num] = -1; 506 num++; 507 } 508 509 csr_ipi_probe(); 510 ipi_set0_regs_init(); 511 ipi_clear0_regs_init(); 512 ipi_status0_regs_init(); 513 ipi_en0_regs_init(); 514 ipi_mailbox_buf_init(); 515 ipi_write_enable(0); 516 517 cpu_set_core(&cpu_data[0], 518 cpu_logical_map(0) % loongson_sysconf.cores_per_package); 519 cpu_data[0].package = cpu_logical_map(0) / loongson_sysconf.cores_per_package; 520 } 521 522 static void __init loongson3_prepare_cpus(unsigned int max_cpus) 523 { 524 if (request_irq(LS_IPI_IRQ, loongson3_ipi_interrupt, 525 IRQF_PERCPU | IRQF_NO_SUSPEND, "SMP_IPI", NULL)) 526 pr_err("Failed to request IPI IRQ\n"); 527 init_cpu_present(cpu_possible_mask); 528 per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; 529 } 530 531 /* 532 * Setup the PC, SP, and GP of a secondary processor and start it runing! 533 */ 534 static int loongson3_boot_secondary(int cpu, struct task_struct *idle) 535 { 536 pr_info("Booting CPU#%d...\n", cpu); 537 538 ipi_write_buf(cpu, idle); 539 540 return 0; 541 } 542 543 #ifdef CONFIG_HOTPLUG_CPU 544 545 static int loongson3_cpu_disable(void) 546 { 547 unsigned long flags; 548 unsigned int cpu = smp_processor_id(); 549 550 set_cpu_online(cpu, false); 551 calculate_cpu_foreign_map(); 552 local_irq_save(flags); 553 clear_c0_status(ST0_IM); 554 local_irq_restore(flags); 555 local_flush_tlb_all(); 556 557 return 0; 558 } 559 560 561 static void loongson3_cpu_die(unsigned int cpu) 562 { 563 while (per_cpu(cpu_state, cpu) != CPU_DEAD) 564 cpu_relax(); 565 566 mb(); 567 } 568 569 /* To shutdown a core in Loongson 3, the target core should go to CKSEG1 and 570 * flush all L1 entries at first. Then, another core (usually Core 0) can 571 * safely disable the clock of the target core. loongson3_play_dead() is 572 * called via CKSEG1 (uncached and unmmaped) 573 */ 574 static void loongson3_type1_play_dead(int *state_addr) 575 { 576 register int val; 577 register long cpuid, core, node, count; 578 register void *addr, *base, *initfunc; 579 580 __asm__ __volatile__( 581 " .set push \n" 582 " .set noreorder \n" 583 " li %[addr], 0x80000000 \n" /* KSEG0 */ 584 "1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */ 585 " cache 0, 1(%[addr]) \n" 586 " cache 0, 2(%[addr]) \n" 587 " cache 0, 3(%[addr]) \n" 588 " cache 1, 0(%[addr]) \n" /* flush L1 DCache */ 589 " cache 1, 1(%[addr]) \n" 590 " cache 1, 2(%[addr]) \n" 591 " cache 1, 3(%[addr]) \n" 592 " addiu %[sets], %[sets], -1 \n" 593 " bnez %[sets], 1b \n" 594 " addiu %[addr], %[addr], 0x20 \n" 595 " li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */ 596 " sw %[val], (%[state_addr]) \n" 597 " sync \n" 598 " cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */ 599 " .set pop \n" 600 : [addr] "=&r" (addr), [val] "=&r" (val) 601 : [state_addr] "r" (state_addr), 602 [sets] "r" (cpu_data[smp_processor_id()].dcache.sets)); 603 604 __asm__ __volatile__( 605 " .set push \n" 606 " .set noreorder \n" 607 " .set mips64 \n" 608 " mfc0 %[cpuid], $15, 1 \n" 609 " andi %[cpuid], 0x3ff \n" 610 " dli %[base], 0x900000003ff01000 \n" 611 " andi %[core], %[cpuid], 0x3 \n" 612 " sll %[core], 8 \n" /* get core id */ 613 " or %[base], %[base], %[core] \n" 614 " andi %[node], %[cpuid], 0xc \n" 615 " dsll %[node], 42 \n" /* get node id */ 616 " or %[base], %[base], %[node] \n" 617 "1: li %[count], 0x100 \n" /* wait for init loop */ 618 "2: bnez %[count], 2b \n" /* limit mailbox access */ 619 " addiu %[count], -1 \n" 620 " ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */ 621 " beqz %[initfunc], 1b \n" 622 " nop \n" 623 " ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */ 624 " ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */ 625 " ld $a1, 0x38(%[base]) \n" 626 " jr %[initfunc] \n" /* jump to initial PC */ 627 " nop \n" 628 " .set pop \n" 629 : [core] "=&r" (core), [node] "=&r" (node), 630 [base] "=&r" (base), [cpuid] "=&r" (cpuid), 631 [count] "=&r" (count), [initfunc] "=&r" (initfunc) 632 : /* No Input */ 633 : "a1"); 634 } 635 636 static void loongson3_type2_play_dead(int *state_addr) 637 { 638 register int val; 639 register long cpuid, core, node, count; 640 register void *addr, *base, *initfunc; 641 642 __asm__ __volatile__( 643 " .set push \n" 644 " .set noreorder \n" 645 " li %[addr], 0x80000000 \n" /* KSEG0 */ 646 "1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */ 647 " cache 0, 1(%[addr]) \n" 648 " cache 0, 2(%[addr]) \n" 649 " cache 0, 3(%[addr]) \n" 650 " cache 1, 0(%[addr]) \n" /* flush L1 DCache */ 651 " cache 1, 1(%[addr]) \n" 652 " cache 1, 2(%[addr]) \n" 653 " cache 1, 3(%[addr]) \n" 654 " addiu %[sets], %[sets], -1 \n" 655 " bnez %[sets], 1b \n" 656 " addiu %[addr], %[addr], 0x20 \n" 657 " li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */ 658 " sw %[val], (%[state_addr]) \n" 659 " sync \n" 660 " cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */ 661 " .set pop \n" 662 : [addr] "=&r" (addr), [val] "=&r" (val) 663 : [state_addr] "r" (state_addr), 664 [sets] "r" (cpu_data[smp_processor_id()].dcache.sets)); 665 666 __asm__ __volatile__( 667 " .set push \n" 668 " .set noreorder \n" 669 " .set mips64 \n" 670 " mfc0 %[cpuid], $15, 1 \n" 671 " andi %[cpuid], 0x3ff \n" 672 " dli %[base], 0x900000003ff01000 \n" 673 " andi %[core], %[cpuid], 0x3 \n" 674 " sll %[core], 8 \n" /* get core id */ 675 " or %[base], %[base], %[core] \n" 676 " andi %[node], %[cpuid], 0xc \n" 677 " dsll %[node], 42 \n" /* get node id */ 678 " or %[base], %[base], %[node] \n" 679 " dsrl %[node], 30 \n" /* 15:14 */ 680 " or %[base], %[base], %[node] \n" 681 "1: li %[count], 0x100 \n" /* wait for init loop */ 682 "2: bnez %[count], 2b \n" /* limit mailbox access */ 683 " addiu %[count], -1 \n" 684 " ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */ 685 " beqz %[initfunc], 1b \n" 686 " nop \n" 687 " ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */ 688 " ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */ 689 " ld $a1, 0x38(%[base]) \n" 690 " jr %[initfunc] \n" /* jump to initial PC */ 691 " nop \n" 692 " .set pop \n" 693 : [core] "=&r" (core), [node] "=&r" (node), 694 [base] "=&r" (base), [cpuid] "=&r" (cpuid), 695 [count] "=&r" (count), [initfunc] "=&r" (initfunc) 696 : /* No Input */ 697 : "a1"); 698 } 699 700 static void loongson3_type3_play_dead(int *state_addr) 701 { 702 register int val; 703 register long cpuid, core, node, count; 704 register void *addr, *base, *initfunc; 705 706 __asm__ __volatile__( 707 " .set push \n" 708 " .set noreorder \n" 709 " li %[addr], 0x80000000 \n" /* KSEG0 */ 710 "1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */ 711 " cache 0, 1(%[addr]) \n" 712 " cache 0, 2(%[addr]) \n" 713 " cache 0, 3(%[addr]) \n" 714 " cache 1, 0(%[addr]) \n" /* flush L1 DCache */ 715 " cache 1, 1(%[addr]) \n" 716 " cache 1, 2(%[addr]) \n" 717 " cache 1, 3(%[addr]) \n" 718 " addiu %[sets], %[sets], -1 \n" 719 " bnez %[sets], 1b \n" 720 " addiu %[addr], %[addr], 0x40 \n" 721 " li %[addr], 0x80000000 \n" /* KSEG0 */ 722 "2: cache 2, 0(%[addr]) \n" /* flush L1 VCache */ 723 " cache 2, 1(%[addr]) \n" 724 " cache 2, 2(%[addr]) \n" 725 " cache 2, 3(%[addr]) \n" 726 " cache 2, 4(%[addr]) \n" 727 " cache 2, 5(%[addr]) \n" 728 " cache 2, 6(%[addr]) \n" 729 " cache 2, 7(%[addr]) \n" 730 " cache 2, 8(%[addr]) \n" 731 " cache 2, 9(%[addr]) \n" 732 " cache 2, 10(%[addr]) \n" 733 " cache 2, 11(%[addr]) \n" 734 " cache 2, 12(%[addr]) \n" 735 " cache 2, 13(%[addr]) \n" 736 " cache 2, 14(%[addr]) \n" 737 " cache 2, 15(%[addr]) \n" 738 " addiu %[vsets], %[vsets], -1 \n" 739 " bnez %[vsets], 2b \n" 740 " addiu %[addr], %[addr], 0x40 \n" 741 " li %[val], 0x7 \n" /* *state_addr = CPU_DEAD; */ 742 " sw %[val], (%[state_addr]) \n" 743 " sync \n" 744 " cache 21, (%[state_addr]) \n" /* flush entry of *state_addr */ 745 " .set pop \n" 746 : [addr] "=&r" (addr), [val] "=&r" (val) 747 : [state_addr] "r" (state_addr), 748 [sets] "r" (cpu_data[smp_processor_id()].dcache.sets), 749 [vsets] "r" (cpu_data[smp_processor_id()].vcache.sets)); 750 751 __asm__ __volatile__( 752 " .set push \n" 753 " .set noreorder \n" 754 " .set mips64 \n" 755 " mfc0 %[cpuid], $15, 1 \n" 756 " andi %[cpuid], 0x3ff \n" 757 " dli %[base], 0x900000003ff01000 \n" 758 " andi %[core], %[cpuid], 0x3 \n" 759 " sll %[core], 8 \n" /* get core id */ 760 " or %[base], %[base], %[core] \n" 761 " andi %[node], %[cpuid], 0xc \n" 762 " dsll %[node], 42 \n" /* get node id */ 763 " or %[base], %[base], %[node] \n" 764 "1: li %[count], 0x100 \n" /* wait for init loop */ 765 "2: bnez %[count], 2b \n" /* limit mailbox access */ 766 " addiu %[count], -1 \n" 767 " lw %[initfunc], 0x20(%[base]) \n" /* check lower 32-bit as jump indicator */ 768 " beqz %[initfunc], 1b \n" 769 " nop \n" 770 " ld %[initfunc], 0x20(%[base]) \n" /* get PC (whole 64-bit) via mailbox */ 771 " ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */ 772 " ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */ 773 " ld $a1, 0x38(%[base]) \n" 774 " jr %[initfunc] \n" /* jump to initial PC */ 775 " nop \n" 776 " .set pop \n" 777 : [core] "=&r" (core), [node] "=&r" (node), 778 [base] "=&r" (base), [cpuid] "=&r" (cpuid), 779 [count] "=&r" (count), [initfunc] "=&r" (initfunc) 780 : /* No Input */ 781 : "a1"); 782 } 783 784 void play_dead(void) 785 { 786 int prid_imp, prid_rev, *state_addr; 787 unsigned int cpu = smp_processor_id(); 788 void (*play_dead_at_ckseg1)(int *); 789 790 idle_task_exit(); 791 792 prid_imp = read_c0_prid() & PRID_IMP_MASK; 793 prid_rev = read_c0_prid() & PRID_REV_MASK; 794 795 if (prid_imp == PRID_IMP_LOONGSON_64G) { 796 play_dead_at_ckseg1 = 797 (void *)CKSEG1ADDR((unsigned long)loongson3_type3_play_dead); 798 goto out; 799 } 800 801 switch (prid_rev) { 802 case PRID_REV_LOONGSON3A_R1: 803 default: 804 play_dead_at_ckseg1 = 805 (void *)CKSEG1ADDR((unsigned long)loongson3_type1_play_dead); 806 break; 807 case PRID_REV_LOONGSON3B_R1: 808 case PRID_REV_LOONGSON3B_R2: 809 play_dead_at_ckseg1 = 810 (void *)CKSEG1ADDR((unsigned long)loongson3_type2_play_dead); 811 break; 812 case PRID_REV_LOONGSON3A_R2_0: 813 case PRID_REV_LOONGSON3A_R2_1: 814 case PRID_REV_LOONGSON3A_R3_0: 815 case PRID_REV_LOONGSON3A_R3_1: 816 play_dead_at_ckseg1 = 817 (void *)CKSEG1ADDR((unsigned long)loongson3_type3_play_dead); 818 break; 819 } 820 821 out: 822 state_addr = &per_cpu(cpu_state, cpu); 823 mb(); 824 play_dead_at_ckseg1(state_addr); 825 } 826 827 static int loongson3_disable_clock(unsigned int cpu) 828 { 829 uint64_t core_id = cpu_core(&cpu_data[cpu]); 830 uint64_t package_id = cpu_data[cpu].package; 831 832 if ((read_c0_prid() & PRID_REV_MASK) == PRID_REV_LOONGSON3A_R1) { 833 LOONGSON_CHIPCFG(package_id) &= ~(1 << (12 + core_id)); 834 } else { 835 if (!(loongson_sysconf.workarounds & WORKAROUND_CPUHOTPLUG)) 836 LOONGSON_FREQCTRL(package_id) &= ~(1 << (core_id * 4 + 3)); 837 } 838 return 0; 839 } 840 841 static int loongson3_enable_clock(unsigned int cpu) 842 { 843 uint64_t core_id = cpu_core(&cpu_data[cpu]); 844 uint64_t package_id = cpu_data[cpu].package; 845 846 if ((read_c0_prid() & PRID_REV_MASK) == PRID_REV_LOONGSON3A_R1) { 847 LOONGSON_CHIPCFG(package_id) |= 1 << (12 + core_id); 848 } else { 849 if (!(loongson_sysconf.workarounds & WORKAROUND_CPUHOTPLUG)) 850 LOONGSON_FREQCTRL(package_id) |= 1 << (core_id * 4 + 3); 851 } 852 return 0; 853 } 854 855 static int register_loongson3_notifier(void) 856 { 857 return cpuhp_setup_state_nocalls(CPUHP_MIPS_SOC_PREPARE, 858 "mips/loongson:prepare", 859 loongson3_enable_clock, 860 loongson3_disable_clock); 861 } 862 early_initcall(register_loongson3_notifier); 863 864 #endif 865 866 const struct plat_smp_ops loongson3_smp_ops = { 867 .send_ipi_single = loongson3_send_ipi_single, 868 .send_ipi_mask = loongson3_send_ipi_mask, 869 .init_secondary = loongson3_init_secondary, 870 .smp_finish = loongson3_smp_finish, 871 .boot_secondary = loongson3_boot_secondary, 872 .smp_setup = loongson3_smp_setup, 873 .prepare_cpus = loongson3_prepare_cpus, 874 #ifdef CONFIG_HOTPLUG_CPU 875 .cpu_disable = loongson3_cpu_disable, 876 .cpu_die = loongson3_cpu_die, 877 #endif 878 #ifdef CONFIG_KEXEC 879 .kexec_nonboot_cpu = kexec_nonboot_cpu_jump, 880 #endif 881 }; 882