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