release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/kernel/leon_smp.c

   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/smp_lock.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel_stat.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
  27 #include <asm/cacheflush.h>
  28 #include <asm/tlbflush.h>
  29
  30 #include <asm/ptrace.h>
  31 #include <asm/atomic.h>
  32 #include <asm/irq_regs.h>
  33
  34 #include <asm/delay.h>
  35 #include <asm/irq.h>
  36 #include <asm/page.h>
  37 #include <asm/pgalloc.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/oplib.h>
  40 #include <asm/cpudata.h>
  41 #include <asm/asi.h>
  42 #include <asm/leon.h>
  43 #include <asm/leon_amba.h>
  44
  45 #ifdef CONFIG_SPARC_LEON
  46
  47 #include "irq.h"
  48
  49 extern ctxd_t *srmmu_ctx_table_phys;
  50 static int smp_processors_ready;
  51 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  52 extern unsigned char boot_cpu_id;
  53 extern cpumask_t smp_commenced_mask;
  54 void __init leon_configure_cache_smp(void);
  55
  56 static inline unsigned long do_swap(volatile unsigned long *ptr,
  57                                     unsigned long val)
  58 {
  59         __asm__ __volatile__("swapa [%1] %2, %0\n\t" : "=&r"(val)
  60                              : "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
  61                              : "memory");
  62         return val;
  63 }
  64
  65 static void smp_setup_percpu_timer(void);
  66
  67 void __cpuinit leon_callin(void)
  68 {
  69         int cpuid = hard_smpleon_processor_id();
  70
  71         local_flush_cache_all();
  72         local_flush_tlb_all();
  73         leon_configure_cache_smp();
  74
  75         /* Get our local ticker going. */
  76         smp_setup_percpu_timer();
  77
  78         calibrate_delay();
  79         smp_store_cpu_info(cpuid);
  80
  81         local_flush_cache_all();
  82         local_flush_tlb_all();
  83
  84         /*
  85          * Unblock the master CPU _only_ when the scheduler state
  86          * of all secondary CPUs will be up-to-date, so after
  87          * the SMP initialization the master will be just allowed
  88          * to call the scheduler code.
  89          * Allow master to continue.
  90          */
  91         do_swap(&cpu_callin_map[cpuid], 1);
  92
  93         local_flush_cache_all();
  94         local_flush_tlb_all();
  95
  96         cpu_probe();
  97
  98         /* Fix idle thread fields. */
  99         __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
 100                              : "memory" /* paranoid */);
 101
 102         /* Attach to the address space of init_task. */
 103         atomic_inc(&init_mm.mm_count);
 104         current->active_mm = &init_mm;
 105
 106         while (!cpu_isset(cpuid, smp_commenced_mask))
 107                 mb();
 108
 109         local_irq_enable();
 110         cpu_set(cpuid, cpu_online_map);
 111 }
 112
 113 /*
 114  *      Cycle through the processors asking the PROM to start each one.
 115  */
 116
 117 extern struct linux_prom_registers smp_penguin_ctable;
 118
 119 void __init leon_configure_cache_smp(void)
 120 {
 121         unsigned long cfg = sparc_leon3_get_dcachecfg();
 122         int me = smp_processor_id();
 123
 124         if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
 125                 printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
 126                      (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
 127                      (unsigned int)cfg, (unsigned int)me);
 128                 sparc_leon3_disable_cache();
 129         } else {
 130                 if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
 131                         sparc_leon3_enable_snooping();
 132                 } else {
 133                         printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
 134                              me);
 135                         sparc_leon3_disable_cache();
 136                 }
 137         }
 138
 139         local_flush_cache_all();
 140         local_flush_tlb_all();
 141 }
 142
 143 void leon_smp_setbroadcast(unsigned int mask)
 144 {
 145         int broadcast =
 146             ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
 147               LEON3_IRQMPSTATUS_BROADCAST) & 1);
 148         if (!broadcast) {
 149                 prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
 150                      leon_smp_nrcpus());
 151                 if (leon_smp_nrcpus() > 1) {
 152                         BUG();
 153                 } else {
 154                         prom_printf("continue anyway\n");
 155                         return;
 156                 }
 157         }
 158         LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
 159 }
 160
 161 unsigned int leon_smp_getbroadcast(void)
 162 {
 163         unsigned int mask;
 164         mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
 165         return mask;
 166 }
 167
 168 int leon_smp_nrcpus(void)
 169 {
 170         int nrcpu =
 171             ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
 172               LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
 173         return nrcpu;
 174 }
 175
 176 void __init leon_boot_cpus(void)
 177 {
 178         int nrcpu = leon_smp_nrcpus();
 179         int me = smp_processor_id();
 180
 181         printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
 182                (unsigned int)nrcpu, (unsigned int)NR_CPUS,
 183                (unsigned int)&(leon3_irqctrl_regs->mpstatus));
 184
 185         leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
 186         leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
 187         leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);
 188
 189         leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
 190
 191         leon_configure_cache_smp();
 192         smp_setup_percpu_timer();
 193         local_flush_cache_all();
 194
 195 }
 196
 197 int __cpuinit leon_boot_one_cpu(int i)
 198 {
 199
 200         struct task_struct *p;
 201         int timeout;
 202
 203         /* Cook up an idler for this guy. */
 204         p = fork_idle(i);
 205
 206         current_set[i] = task_thread_info(p);
 207
 208         /* See trampoline.S:leon_smp_cpu_startup for details...
 209          * Initialize the contexts table
 210          * Since the call to prom_startcpu() trashes the structure,
 211          * we need to re-initialize it for each cpu
 212          */
 213         smp_penguin_ctable.which_io = 0;
 214         smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
 215         smp_penguin_ctable.reg_size = 0;
 216
 217         /* whirrr, whirrr, whirrrrrrrrr... */
 218         printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
 219                (unsigned int)&leon3_irqctrl_regs->mpstatus);
 220         local_flush_cache_all();
 221
 222         LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
 223
 224         /* wheee... it's going... */
 225         for (timeout = 0; timeout < 10000; timeout++) {
 226                 if (cpu_callin_map[i])
 227                         break;
 228                 udelay(200);
 229         }
 230         printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
 231
 232         if (!(cpu_callin_map[i])) {
 233                 printk(KERN_ERR "Processor %d is stuck.\n", i);
 234                 return -ENODEV;
 235         } else {
 236                 leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
 237                 leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
 238                 leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
 239         }
 240
 241         local_flush_cache_all();
 242         return 0;
 243 }
 244
 245 void __init leon_smp_done(void)
 246 {
 247
 248         int i, first;
 249         int *prev;
 250
 251         /* setup cpu list for irq rotation */
 252         first = 0;
 253         prev = &first;
 254         for (i = 0; i < NR_CPUS; i++) {
 255                 if (cpu_online(i)) {
 256                         *prev = i;
 257                         prev = &cpu_data(i).next;
 258                 }
 259         }
 260         *prev = first;
 261         local_flush_cache_all();
 262
 263         /* Free unneeded trap tables */
 264         if (!cpu_isset(1, cpu_present_map)) {
 265                 ClearPageReserved(virt_to_page(trapbase_cpu1));
 266                 init_page_count(virt_to_page(trapbase_cpu1));
 267                 free_page((unsigned long)trapbase_cpu1);
 268                 totalram_pages++;
 269                 num_physpages++;
 270         }
 271         if (!cpu_isset(2, cpu_present_map)) {
 272                 ClearPageReserved(virt_to_page(trapbase_cpu2));
 273                 init_page_count(virt_to_page(trapbase_cpu2));
 274                 free_page((unsigned long)trapbase_cpu2);
 275                 totalram_pages++;
 276                 num_physpages++;
 277         }
 278         if (!cpu_isset(3, cpu_present_map)) {
 279                 ClearPageReserved(virt_to_page(trapbase_cpu3));
 280                 init_page_count(virt_to_page(trapbase_cpu3));
 281                 free_page((unsigned long)trapbase_cpu3);
 282                 totalram_pages++;
 283                 num_physpages++;
 284         }
 285         /* Ok, they are spinning and ready to go. */
 286         smp_processors_ready = 1;
 287
 288 }
 289
 290 void leon_irq_rotate(int cpu)
 291 {
 292 }
 293
 294 static struct smp_funcall {
 295         smpfunc_t func;
 296         unsigned long arg1;
 297         unsigned long arg2;
 298         unsigned long arg3;
 299         unsigned long arg4;
 300         unsigned long arg5;
 301         unsigned long processors_in[NR_CPUS];   /* Set when ipi entered. */
 302         unsigned long processors_out[NR_CPUS];  /* Set when ipi exited. */
 303 } ccall_info;
 304
 305 static DEFINE_SPINLOCK(cross_call_lock);
 306
 307 /* Cross calls must be serialized, at least currently. */
 308 static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 309                             unsigned long arg2, unsigned long arg3,
 310                             unsigned long arg4)
 311 {
 312         if (smp_processors_ready) {
 313                 register int high = NR_CPUS - 1;
 314                 unsigned long flags;
 315
 316                 spin_lock_irqsave(&cross_call_lock, flags);
 317
 318                 {
 319                         /* If you make changes here, make sure gcc generates proper code... */
 320                         register smpfunc_t f asm("i0") = func;
 321                         register unsigned long a1 asm("i1") = arg1;
 322                         register unsigned long a2 asm("i2") = arg2;
 323                         register unsigned long a3 asm("i3") = arg3;
 324                         register unsigned long a4 asm("i4") = arg4;
 325                         register unsigned long a5 asm("i5") = 0;
 326
 327                         __asm__ __volatile__("std %0, [%6]\n\t"
 328                                              "std %2, [%6 + 8]\n\t"
 329                                              "std %4, [%6 + 16]\n\t" : :
 330                                              "r"(f), "r"(a1), "r"(a2), "r"(a3),
 331                                              "r"(a4), "r"(a5),
 332                                              "r"(&ccall_info.func));
 333                 }
 334
 335                 /* Init receive/complete mapping, plus fire the IPI's off. */
 336                 {
 337                         register int i;
 338
 339                         cpu_clear(smp_processor_id(), mask);
 340                         cpus_and(mask, cpu_online_map, mask);
 341                         for (i = 0; i <= high; i++) {
 342                                 if (cpu_isset(i, mask)) {
 343                                         ccall_info.processors_in[i] = 0;
 344                                         ccall_info.processors_out[i] = 0;
 345                                         set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
 346
 347                                 }
 348                         }
 349                 }
 350
 351                 {
 352                         register int i;
 353
 354                         i = 0;
 355                         do {
 356                                 if (!cpu_isset(i, mask))
 357                                         continue;
 358
 359                                 while (!ccall_info.processors_in[i])
 360                                         barrier();
 361                         } while (++i <= high);
 362
 363                         i = 0;
 364                         do {
 365                                 if (!cpu_isset(i, mask))
 366                                         continue;
 367
 368                                 while (!ccall_info.processors_out[i])
 369                                         barrier();
 370                         } while (++i <= high);
 371                 }
 372
 373                 spin_unlock_irqrestore(&cross_call_lock, flags);
 374         }
 375 }
 376
 377 /* Running cross calls. */
 378 void leon_cross_call_irq(void)
 379 {
 380         int i = smp_processor_id();
 381
 382         ccall_info.processors_in[i] = 1;
 383         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 384                         ccall_info.arg4, ccall_info.arg5);
 385         ccall_info.processors_out[i] = 1;
 386 }
 387
 388 void leon_percpu_timer_interrupt(struct pt_regs *regs)
 389 {
 390         struct pt_regs *old_regs;
 391         int cpu = smp_processor_id();
 392
 393         old_regs = set_irq_regs(regs);
 394
 395         leon_clear_profile_irq(cpu);
 396
 397         profile_tick(CPU_PROFILING);
 398
 399         if (!--prof_counter(cpu)) {
 400                 int user = user_mode(regs);
 401
 402                 irq_enter();
 403                 update_process_times(user);
 404                 irq_exit();
 405
 406                 prof_counter(cpu) = prof_multiplier(cpu);
 407         }
 408         set_irq_regs(old_regs);
 409 }
 410
 411 static void __init smp_setup_percpu_timer(void)
 412 {
 413         int cpu = smp_processor_id();
 414
 415         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 416 }
 417
 418 void __init leon_blackbox_id(unsigned *addr)
 419 {
 420         int rd = *addr & 0x3e000000;
 421         int rs1 = rd >> 11;
 422
 423         /* patch places where ___b_hard_smp_processor_id appears */
 424         addr[0] = 0x81444000 | rd;      /* rd %asr17, reg */
 425         addr[1] = 0x8130201c | rd | rs1;        /* srl reg, 0x1c, reg */
 426         addr[2] = 0x01000000;   /* nop */
 427 }
 428
 429 void __init leon_blackbox_current(unsigned *addr)
 430 {
 431         int rd = *addr & 0x3e000000;
 432         int rs1 = rd >> 11;
 433
 434         /* patch LOAD_CURRENT macro where ___b_load_current appears */
 435         addr[0] = 0x81444000 | rd;      /* rd %asr17, reg */
 436         addr[2] = 0x8130201c | rd | rs1;        /* srl reg, 0x1c, reg */
 437         addr[4] = 0x81282002 | rd | rs1;        /* sll reg, 0x2, reg */
 438
 439 }
 440
 441 /*
 442  * CPU idle callback function
 443  * See .../arch/sparc/kernel/process.c
 444  */
 445 void pmc_leon_idle(void)
 446 {
 447         __asm__ volatile ("mov %g0, %asr19");
 448 }
 449
 450 void __init leon_init_smp(void)
 451 {
 452         /* Patch ipi15 trap table */
 453         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
 454
 455         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
 456         BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
 457         BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
 458         BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
 459                         BTFIXUPCALL_NORM);
 460
 461 #ifndef PMC_NO_IDLE
 462         /* Assign power management IDLE handler */
 463         pm_idle = pmc_leon_idle;
 464         printk(KERN_INFO "leon: power management initialized\n");
 465 #endif
 466
 467 }
 468
 469 #endif /* CONFIG_SPARC_LEON */