1 /* leon_smp.c: Sparc-Leon SMP support. 2 * 3 * based on sun4m_smp.c 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB 6 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB 7 */ 8 9 #include <asm/head.h> 10 11 #include <linux/kernel.h> 12 #include <linux/sched.h> 13 #include <linux/threads.h> 14 #include <linux/smp.h> 15 #include <linux/interrupt.h> 16 #include <linux/kernel_stat.h> 17 #include <linux/of.h> 18 #include <linux/init.h> 19 #include <linux/spinlock.h> 20 #include <linux/mm.h> 21 #include <linux/swap.h> 22 #include <linux/profile.h> 23 #include <linux/pm.h> 24 #include <linux/delay.h> 25 #include <linux/gfp.h> 26 #include <linux/cpu.h> 27 #include <linux/clockchips.h> 28 29 #include <asm/cacheflush.h> 30 #include <asm/tlbflush.h> 31 32 #include <asm/ptrace.h> 33 #include <linux/atomic.h> 34 #include <asm/irq_regs.h> 35 #include <asm/traps.h> 36 37 #include <asm/delay.h> 38 #include <asm/irq.h> 39 #include <asm/page.h> 40 #include <asm/pgalloc.h> 41 #include <asm/pgtable.h> 42 #include <asm/oplib.h> 43 #include <asm/cpudata.h> 44 #include <asm/asi.h> 45 #include <asm/leon.h> 46 #include <asm/leon_amba.h> 47 #include <asm/timer.h> 48 49 #include "kernel.h" 50 51 #include "irq.h" 52 53 extern ctxd_t *srmmu_ctx_table_phys; 54 static int smp_processors_ready; 55 extern volatile unsigned long cpu_callin_map[NR_CPUS]; 56 extern cpumask_t smp_commenced_mask; 57 void __cpuinit leon_configure_cache_smp(void); 58 static void leon_ipi_init(void); 59 60 /* IRQ number of LEON IPIs */ 61 int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT; 62 63 static inline unsigned long do_swap(volatile unsigned long *ptr, 64 unsigned long val) 65 { 66 __asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val) 67 : "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS) 68 : "memory"); 69 return val; 70 } 71 72 void __cpuinit leon_callin(void) 73 { 74 int cpuid = hard_smp_processor_id(); 75 76 local_ops->cache_all(); 77 local_ops->tlb_all(); 78 leon_configure_cache_smp(); 79 80 notify_cpu_starting(cpuid); 81 82 /* Get our local ticker going. */ 83 register_percpu_ce(cpuid); 84 85 calibrate_delay(); 86 smp_store_cpu_info(cpuid); 87 88 local_ops->cache_all(); 89 local_ops->tlb_all(); 90 91 /* 92 * Unblock the master CPU _only_ when the scheduler state 93 * of all secondary CPUs will be up-to-date, so after 94 * the SMP initialization the master will be just allowed 95 * to call the scheduler code. 96 * Allow master to continue. 97 */ 98 do_swap(&cpu_callin_map[cpuid], 1); 99 100 local_ops->cache_all(); 101 local_ops->tlb_all(); 102 103 /* Fix idle thread fields. */ 104 __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid]) 105 : "memory" /* paranoid */); 106 107 /* Attach to the address space of init_task. */ 108 atomic_inc(&init_mm.mm_count); 109 current->active_mm = &init_mm; 110 111 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) 112 mb(); 113 114 local_irq_enable(); 115 set_cpu_online(cpuid, true); 116 } 117 118 /* 119 * Cycle through the processors asking the PROM to start each one. 120 */ 121 122 extern struct linux_prom_registers smp_penguin_ctable; 123 124 void __cpuinit leon_configure_cache_smp(void) 125 { 126 unsigned long cfg = sparc_leon3_get_dcachecfg(); 127 int me = smp_processor_id(); 128 129 if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) { 130 printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n", 131 (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg), 132 (unsigned int)cfg, (unsigned int)me); 133 sparc_leon3_disable_cache(); 134 } else { 135 if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) { 136 sparc_leon3_enable_snooping(); 137 } else { 138 printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n", 139 me); 140 sparc_leon3_disable_cache(); 141 } 142 } 143 144 local_ops->cache_all(); 145 local_ops->tlb_all(); 146 } 147 148 void leon_smp_setbroadcast(unsigned int mask) 149 { 150 int broadcast = 151 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> 152 LEON3_IRQMPSTATUS_BROADCAST) & 1); 153 if (!broadcast) { 154 prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n", 155 leon_smp_nrcpus()); 156 if (leon_smp_nrcpus() > 1) { 157 BUG(); 158 } else { 159 prom_printf("continue anyway\n"); 160 return; 161 } 162 } 163 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask); 164 } 165 166 unsigned int leon_smp_getbroadcast(void) 167 { 168 unsigned int mask; 169 mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast)); 170 return mask; 171 } 172 173 int leon_smp_nrcpus(void) 174 { 175 int nrcpu = 176 ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> 177 LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1; 178 return nrcpu; 179 } 180 181 void __init leon_boot_cpus(void) 182 { 183 int nrcpu = leon_smp_nrcpus(); 184 int me = smp_processor_id(); 185 186 /* Setup IPI */ 187 leon_ipi_init(); 188 189 printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me, 190 (unsigned int)nrcpu, (unsigned int)NR_CPUS, 191 (unsigned int)&(leon3_irqctrl_regs->mpstatus)); 192 193 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me); 194 leon_enable_irq_cpu(LEON3_IRQ_TICKER, me); 195 leon_enable_irq_cpu(leon_ipi_irq, me); 196 197 leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER); 198 199 leon_configure_cache_smp(); 200 local_ops->cache_all(); 201 202 } 203 204 int __cpuinit leon_boot_one_cpu(int i, struct task_struct *idle) 205 { 206 int timeout; 207 208 current_set[i] = task_thread_info(idle); 209 210 /* See trampoline.S:leon_smp_cpu_startup for details... 211 * Initialize the contexts table 212 * Since the call to prom_startcpu() trashes the structure, 213 * we need to re-initialize it for each cpu 214 */ 215 smp_penguin_ctable.which_io = 0; 216 smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys; 217 smp_penguin_ctable.reg_size = 0; 218 219 /* whirrr, whirrr, whirrrrrrrrr... */ 220 printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i, 221 (unsigned int)&leon3_irqctrl_regs->mpstatus); 222 local_ops->cache_all(); 223 224 /* Make sure all IRQs are of from the start for this new CPU */ 225 LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0); 226 227 /* Wake one CPU */ 228 LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i); 229 230 /* wheee... it's going... */ 231 for (timeout = 0; timeout < 10000; timeout++) { 232 if (cpu_callin_map[i]) 233 break; 234 udelay(200); 235 } 236 printk(KERN_INFO "Started CPU %d\n", (unsigned int)i); 237 238 if (!(cpu_callin_map[i])) { 239 printk(KERN_ERR "Processor %d is stuck.\n", i); 240 return -ENODEV; 241 } else { 242 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i); 243 leon_enable_irq_cpu(LEON3_IRQ_TICKER, i); 244 leon_enable_irq_cpu(leon_ipi_irq, i); 245 } 246 247 local_ops->cache_all(); 248 return 0; 249 } 250 251 void __init leon_smp_done(void) 252 { 253 254 int i, first; 255 int *prev; 256 257 /* setup cpu list for irq rotation */ 258 first = 0; 259 prev = &first; 260 for (i = 0; i < NR_CPUS; i++) { 261 if (cpu_online(i)) { 262 *prev = i; 263 prev = &cpu_data(i).next; 264 } 265 } 266 *prev = first; 267 local_ops->cache_all(); 268 269 /* Free unneeded trap tables */ 270 if (!cpu_present(1)) { 271 ClearPageReserved(virt_to_page(&trapbase_cpu1)); 272 init_page_count(virt_to_page(&trapbase_cpu1)); 273 free_page((unsigned long)&trapbase_cpu1); 274 totalram_pages++; 275 num_physpages++; 276 } 277 if (!cpu_present(2)) { 278 ClearPageReserved(virt_to_page(&trapbase_cpu2)); 279 init_page_count(virt_to_page(&trapbase_cpu2)); 280 free_page((unsigned long)&trapbase_cpu2); 281 totalram_pages++; 282 num_physpages++; 283 } 284 if (!cpu_present(3)) { 285 ClearPageReserved(virt_to_page(&trapbase_cpu3)); 286 init_page_count(virt_to_page(&trapbase_cpu3)); 287 free_page((unsigned long)&trapbase_cpu3); 288 totalram_pages++; 289 num_physpages++; 290 } 291 /* Ok, they are spinning and ready to go. */ 292 smp_processors_ready = 1; 293 294 } 295 296 void leon_irq_rotate(int cpu) 297 { 298 } 299 300 struct leon_ipi_work { 301 int single; 302 int msk; 303 int resched; 304 }; 305 306 static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work); 307 308 /* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ 309 * is used for all three types of IPIs. 310 */ 311 static void __init leon_ipi_init(void) 312 { 313 int cpu, len; 314 struct leon_ipi_work *work; 315 struct property *pp; 316 struct device_node *rootnp; 317 struct tt_entry *trap_table; 318 unsigned long flags; 319 320 /* Find IPI IRQ or stick with default value */ 321 rootnp = of_find_node_by_path("/ambapp0"); 322 if (rootnp) { 323 pp = of_find_property(rootnp, "ipi_num", &len); 324 if (pp && (*(int *)pp->value)) 325 leon_ipi_irq = *(int *)pp->value; 326 } 327 printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq); 328 329 /* Adjust so that we jump directly to smpleon_ipi */ 330 local_irq_save(flags); 331 trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)]; 332 trap_table->inst_three += smpleon_ipi - real_irq_entry; 333 local_ops->cache_all(); 334 local_irq_restore(flags); 335 336 for_each_possible_cpu(cpu) { 337 work = &per_cpu(leon_ipi_work, cpu); 338 work->single = work->msk = work->resched = 0; 339 } 340 } 341 342 static void leon_send_ipi(int cpu, int level) 343 { 344 unsigned long mask; 345 mask = leon_get_irqmask(level); 346 LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask); 347 } 348 349 static void leon_ipi_single(int cpu) 350 { 351 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); 352 353 /* Mark work */ 354 work->single = 1; 355 356 /* Generate IRQ on the CPU */ 357 leon_send_ipi(cpu, leon_ipi_irq); 358 } 359 360 static void leon_ipi_mask_one(int cpu) 361 { 362 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); 363 364 /* Mark work */ 365 work->msk = 1; 366 367 /* Generate IRQ on the CPU */ 368 leon_send_ipi(cpu, leon_ipi_irq); 369 } 370 371 static void leon_ipi_resched(int cpu) 372 { 373 struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); 374 375 /* Mark work */ 376 work->resched = 1; 377 378 /* Generate IRQ on the CPU (any IRQ will cause resched) */ 379 leon_send_ipi(cpu, leon_ipi_irq); 380 } 381 382 void leonsmp_ipi_interrupt(void) 383 { 384 struct leon_ipi_work *work = &__get_cpu_var(leon_ipi_work); 385 386 if (work->single) { 387 work->single = 0; 388 smp_call_function_single_interrupt(); 389 } 390 if (work->msk) { 391 work->msk = 0; 392 smp_call_function_interrupt(); 393 } 394 if (work->resched) { 395 work->resched = 0; 396 smp_resched_interrupt(); 397 } 398 } 399 400 static struct smp_funcall { 401 smpfunc_t func; 402 unsigned long arg1; 403 unsigned long arg2; 404 unsigned long arg3; 405 unsigned long arg4; 406 unsigned long arg5; 407 unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */ 408 unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */ 409 } ccall_info; 410 411 static DEFINE_SPINLOCK(cross_call_lock); 412 413 /* Cross calls must be serialized, at least currently. */ 414 static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, 415 unsigned long arg2, unsigned long arg3, 416 unsigned long arg4) 417 { 418 if (smp_processors_ready) { 419 register int high = NR_CPUS - 1; 420 unsigned long flags; 421 422 spin_lock_irqsave(&cross_call_lock, flags); 423 424 { 425 /* If you make changes here, make sure gcc generates proper code... */ 426 register smpfunc_t f asm("i0") = func; 427 register unsigned long a1 asm("i1") = arg1; 428 register unsigned long a2 asm("i2") = arg2; 429 register unsigned long a3 asm("i3") = arg3; 430 register unsigned long a4 asm("i4") = arg4; 431 register unsigned long a5 asm("i5") = 0; 432 433 __asm__ __volatile__("std %0, [%6]\n\t" 434 "std %2, [%6 + 8]\n\t" 435 "std %4, [%6 + 16]\n\t" : : 436 "r"(f), "r"(a1), "r"(a2), "r"(a3), 437 "r"(a4), "r"(a5), 438 "r"(&ccall_info.func)); 439 } 440 441 /* Init receive/complete mapping, plus fire the IPI's off. */ 442 { 443 register int i; 444 445 cpumask_clear_cpu(smp_processor_id(), &mask); 446 cpumask_and(&mask, cpu_online_mask, &mask); 447 for (i = 0; i <= high; i++) { 448 if (cpumask_test_cpu(i, &mask)) { 449 ccall_info.processors_in[i] = 0; 450 ccall_info.processors_out[i] = 0; 451 leon_send_ipi(i, LEON3_IRQ_CROSS_CALL); 452 453 } 454 } 455 } 456 457 { 458 register int i; 459 460 i = 0; 461 do { 462 if (!cpumask_test_cpu(i, &mask)) 463 continue; 464 465 while (!ccall_info.processors_in[i]) 466 barrier(); 467 } while (++i <= high); 468 469 i = 0; 470 do { 471 if (!cpumask_test_cpu(i, &mask)) 472 continue; 473 474 while (!ccall_info.processors_out[i]) 475 barrier(); 476 } while (++i <= high); 477 } 478 479 spin_unlock_irqrestore(&cross_call_lock, flags); 480 } 481 } 482 483 /* Running cross calls. */ 484 void leon_cross_call_irq(void) 485 { 486 int i = smp_processor_id(); 487 488 ccall_info.processors_in[i] = 1; 489 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, 490 ccall_info.arg4, ccall_info.arg5); 491 ccall_info.processors_out[i] = 1; 492 } 493 494 static const struct sparc32_ipi_ops leon_ipi_ops = { 495 .cross_call = leon_cross_call, 496 .resched = leon_ipi_resched, 497 .single = leon_ipi_single, 498 .mask_one = leon_ipi_mask_one, 499 }; 500 501 void __init leon_init_smp(void) 502 { 503 /* Patch ipi15 trap table */ 504 t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m); 505 506 sparc32_ipi_ops = &leon_ipi_ops; 507 } 508