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