linux/arch/sparc/kernel/sun4d_irq.c
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   1/*
   2 *  arch/sparc/kernel/sun4d_irq.c:
   3 *                      SS1000/SC2000 interrupt handling.
   4 *
   5 *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6 *  Heavily based on arch/sparc/kernel/irq.c.
   7 */
   8
   9#include <linux/errno.h>
  10#include <linux/linkage.h>
  11#include <linux/kernel_stat.h>
  12#include <linux/signal.h>
  13#include <linux/sched.h>
  14#include <linux/ptrace.h>
  15#include <linux/interrupt.h>
  16#include <linux/slab.h>
  17#include <linux/random.h>
  18#include <linux/init.h>
  19#include <linux/smp.h>
  20#include <linux/spinlock.h>
  21#include <linux/seq_file.h>
  22
  23#include <asm/ptrace.h>
  24#include <asm/processor.h>
  25#include <asm/system.h>
  26#include <asm/psr.h>
  27#include <asm/smp.h>
  28#include <asm/vaddrs.h>
  29#include <asm/timer.h>
  30#include <asm/openprom.h>
  31#include <asm/oplib.h>
  32#include <asm/traps.h>
  33#include <asm/irq.h>
  34#include <asm/io.h>
  35#include <asm/pgalloc.h>
  36#include <asm/pgtable.h>
  37#include <asm/sbus.h>
  38#include <asm/sbi.h>
  39#include <asm/cacheflush.h>
  40#include <asm/irq_regs.h>
  41
  42#include "irq.h"
  43
  44/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
  45/* #define DISTRIBUTE_IRQS */
  46
  47struct sun4d_timer_regs *sun4d_timers;
  48#define TIMER_IRQ       10
  49
  50#define MAX_STATIC_ALLOC        4
  51extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
  52extern int static_irq_count;
  53unsigned char cpu_leds[32];
  54#ifdef CONFIG_SMP
  55static unsigned char sbus_tid[32];
  56#endif
  57
  58static struct irqaction *irq_action[NR_IRQS];
  59extern spinlock_t irq_action_lock;
  60
  61static struct sbus_action {
  62        struct irqaction *action;
  63        /* For SMP this needs to be extended */
  64} *sbus_actions;
  65
  66static int pil_to_sbus[] = {
  67        0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
  68};
  69
  70static int sbus_to_pil[] = {
  71        0, 2, 3, 5, 7, 9, 11, 13,
  72};
  73
  74static int nsbi;
  75#ifdef CONFIG_SMP
  76DEFINE_SPINLOCK(sun4d_imsk_lock);
  77#endif
  78
  79int show_sun4d_interrupts(struct seq_file *p, void *v)
  80{
  81        int i = *(loff_t *) v, j = 0, k = 0, sbusl;
  82        struct irqaction * action;
  83        unsigned long flags;
  84#ifdef CONFIG_SMP
  85        int x;
  86#endif
  87
  88        spin_lock_irqsave(&irq_action_lock, flags);
  89        if (i < NR_IRQS) {
  90                sbusl = pil_to_sbus[i];
  91                if (!sbusl) {
  92                        action = *(i + irq_action);
  93                        if (!action) 
  94                                goto out_unlock;
  95                } else {
  96                        for (j = 0; j < nsbi; j++) {
  97                                for (k = 0; k < 4; k++)
  98                                        if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
  99                                                goto found_it;
 100                        }
 101                        goto out_unlock;
 102                }
 103found_it:       seq_printf(p, "%3d: ", i);
 104#ifndef CONFIG_SMP
 105                seq_printf(p, "%10u ", kstat_irqs(i));
 106#else
 107                for_each_online_cpu(x)
 108                        seq_printf(p, "%10u ",
 109                               kstat_cpu(cpu_logical_map(x)).irqs[i]);
 110#endif
 111                seq_printf(p, "%c %s",
 112                        (action->flags & IRQF_DISABLED) ? '+' : ' ',
 113                        action->name);
 114                action = action->next;
 115                for (;;) {
 116                        for (; action; action = action->next) {
 117                                seq_printf(p, ",%s %s",
 118                                        (action->flags & IRQF_DISABLED) ? " +" : "",
 119                                        action->name);
 120                        }
 121                        if (!sbusl) break;
 122                        k++;
 123                        if (k < 4)
 124                                action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
 125                        else {
 126                                j++;
 127                                if (j == nsbi) break;
 128                                k = 0;
 129                                action = sbus_actions [(j << 5) + (sbusl << 2)].action;
 130                        }
 131                }
 132                seq_putc(p, '\n');
 133        }
 134out_unlock:
 135        spin_unlock_irqrestore(&irq_action_lock, flags);
 136        return 0;
 137}
 138
 139void sun4d_free_irq(unsigned int irq, void *dev_id)
 140{
 141        struct irqaction *action, **actionp;
 142        struct irqaction *tmp = NULL;
 143        unsigned long flags;
 144
 145        spin_lock_irqsave(&irq_action_lock, flags);
 146        if (irq < 15)
 147                actionp = irq + irq_action;
 148        else
 149                actionp = &(sbus_actions[irq - (1 << 5)].action);
 150        action = *actionp;
 151        if (!action) {
 152                printk("Trying to free free IRQ%d\n",irq);
 153                goto out_unlock;
 154        }
 155        if (dev_id) {
 156                for (; action; action = action->next) {
 157                        if (action->dev_id == dev_id)
 158                                break;
 159                        tmp = action;
 160                }
 161                if (!action) {
 162                        printk("Trying to free free shared IRQ%d\n",irq);
 163                        goto out_unlock;
 164                }
 165        } else if (action->flags & IRQF_SHARED) {
 166                printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
 167                goto out_unlock;
 168        }
 169        if (action->flags & SA_STATIC_ALLOC)
 170        {
 171                /* This interrupt is marked as specially allocated
 172                 * so it is a bad idea to free it.
 173                 */
 174                printk("Attempt to free statically allocated IRQ%d (%s)\n",
 175                       irq, action->name);
 176                goto out_unlock;
 177        }
 178        
 179        if (action && tmp)
 180                tmp->next = action->next;
 181        else
 182                *actionp = action->next;
 183
 184        spin_unlock_irqrestore(&irq_action_lock, flags);
 185
 186        synchronize_irq(irq);
 187
 188        spin_lock_irqsave(&irq_action_lock, flags);
 189
 190        kfree(action);
 191
 192        if (!(*actionp))
 193                __disable_irq(irq);
 194
 195out_unlock:
 196        spin_unlock_irqrestore(&irq_action_lock, flags);
 197}
 198
 199extern void unexpected_irq(int, void *, struct pt_regs *);
 200
 201void sun4d_handler_irq(int irq, struct pt_regs * regs)
 202{
 203        struct pt_regs *old_regs;
 204        struct irqaction * action;
 205        int cpu = smp_processor_id();
 206        /* SBUS IRQ level (1 - 7) */
 207        int sbusl = pil_to_sbus[irq];
 208        
 209        /* FIXME: Is this necessary?? */
 210        cc_get_ipen();
 211        
 212        cc_set_iclr(1 << irq);
 213        
 214        old_regs = set_irq_regs(regs);
 215        irq_enter();
 216        kstat_cpu(cpu).irqs[irq]++;
 217        if (!sbusl) {
 218                action = *(irq + irq_action);
 219                if (!action)
 220                        unexpected_irq(irq, NULL, regs);
 221                do {
 222                        action->handler(irq, action->dev_id);
 223                        action = action->next;
 224                } while (action);
 225        } else {
 226                int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
 227                int sbino;
 228                struct sbus_action *actionp;
 229                unsigned mask, slot;
 230                int sbil = (sbusl << 2);
 231                
 232                bw_clear_intr_mask(sbusl, bus_mask);
 233                
 234                /* Loop for each pending SBI */
 235                for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
 236                        if (bus_mask & 1) {
 237                                mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
 238                                mask &= (0xf << sbil);
 239                                actionp = sbus_actions + (sbino << 5) + (sbil);
 240                                /* Loop for each pending SBI slot */
 241                                for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
 242                                        if (mask & slot) {
 243                                                mask &= ~slot;
 244                                                action = actionp->action;
 245                                                
 246                                                if (!action)
 247                                                        unexpected_irq(irq, NULL, regs);
 248                                                do {
 249                                                        action->handler(irq, action->dev_id);
 250                                                        action = action->next;
 251                                                } while (action);
 252                                                release_sbi(SBI2DEVID(sbino), slot);
 253                                        }
 254                        }
 255        }
 256        irq_exit();
 257        set_irq_regs(old_regs);
 258}
 259
 260unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
 261{
 262        int sbusl = pil_to_sbus[irq];
 263
 264        if (sbusl)
 265                return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
 266        else
 267                return irq;
 268}
 269
 270static unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev,
 271                                       unsigned int sbint)
 272{
 273        if (sbint >= sizeof(sbus_to_pil)) {
 274                printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
 275                BUG();
 276        }
 277        return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
 278}
 279
 280int sun4d_request_irq(unsigned int irq,
 281                irq_handler_t handler,
 282                unsigned long irqflags, const char * devname, void *dev_id)
 283{
 284        struct irqaction *action, *tmp = NULL, **actionp;
 285        unsigned long flags;
 286        int ret;
 287        
 288        if(irq > 14 && irq < (1 << 5)) {
 289                ret = -EINVAL;
 290                goto out;
 291        }
 292
 293        if (!handler) {
 294                ret = -EINVAL;
 295                goto out;
 296        }
 297
 298        spin_lock_irqsave(&irq_action_lock, flags);
 299
 300        if (irq >= (1 << 5))
 301                actionp = &(sbus_actions[irq - (1 << 5)].action);
 302        else
 303                actionp = irq + irq_action;
 304        action = *actionp;
 305        
 306        if (action) {
 307                if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
 308                        for (tmp = action; tmp->next; tmp = tmp->next);
 309                } else {
 310                        ret = -EBUSY;
 311                        goto out_unlock;
 312                }
 313                if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
 314                        printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
 315                        ret = -EBUSY;
 316                        goto out_unlock;
 317                }
 318                action = NULL;          /* Or else! */
 319        }
 320
 321        /* If this is flagged as statically allocated then we use our
 322         * private struct which is never freed.
 323         */
 324        if (irqflags & SA_STATIC_ALLOC) {
 325                if (static_irq_count < MAX_STATIC_ALLOC)
 326                        action = &static_irqaction[static_irq_count++];
 327                else
 328                        printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
 329        }
 330        
 331        if (action == NULL)
 332                action = kmalloc(sizeof(struct irqaction),
 333                                                     GFP_ATOMIC);
 334        
 335        if (!action) { 
 336                ret = -ENOMEM;
 337                goto out_unlock;
 338        }
 339
 340        action->handler = handler;
 341        action->flags = irqflags;
 342        cpus_clear(action->mask);
 343        action->name = devname;
 344        action->next = NULL;
 345        action->dev_id = dev_id;
 346
 347        if (tmp)
 348                tmp->next = action;
 349        else
 350                *actionp = action;
 351                
 352        __enable_irq(irq);
 353
 354        ret = 0;
 355out_unlock:
 356        spin_unlock_irqrestore(&irq_action_lock, flags);
 357out:
 358        return ret;
 359}
 360
 361static void sun4d_disable_irq(unsigned int irq)
 362{
 363#ifdef CONFIG_SMP
 364        int tid = sbus_tid[(irq >> 5) - 1];
 365        unsigned long flags;
 366#endif  
 367        
 368        if (irq < NR_IRQS) return;
 369#ifdef CONFIG_SMP
 370        spin_lock_irqsave(&sun4d_imsk_lock, flags);
 371        cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
 372        spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 373#else           
 374        cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
 375#endif
 376}
 377
 378static void sun4d_enable_irq(unsigned int irq)
 379{
 380#ifdef CONFIG_SMP
 381        int tid = sbus_tid[(irq >> 5) - 1];
 382        unsigned long flags;
 383#endif  
 384        
 385        if (irq < NR_IRQS) return;
 386#ifdef CONFIG_SMP
 387        spin_lock_irqsave(&sun4d_imsk_lock, flags);
 388        cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 389        spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 390#else           
 391        cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
 392#endif
 393}
 394
 395#ifdef CONFIG_SMP
 396static void sun4d_set_cpu_int(int cpu, int level)
 397{
 398        sun4d_send_ipi(cpu, level);
 399}
 400
 401static void sun4d_clear_ipi(int cpu, int level)
 402{
 403}
 404
 405static void sun4d_set_udt(int cpu)
 406{
 407}
 408
 409/* Setup IRQ distribution scheme. */
 410void __init sun4d_distribute_irqs(void)
 411{
 412#ifdef DISTRIBUTE_IRQS
 413        struct sbus_bus *sbus;
 414        unsigned long sbus_serving_map;
 415
 416        sbus_serving_map = cpu_present_map;
 417        for_each_sbus(sbus) {
 418                if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
 419                        sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 420                else if (cpu_present_map & (1 << (sbus->board * 2)))
 421                        sbus_tid[sbus->board] = (sbus->board * 2);
 422                else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
 423                        sbus_tid[sbus->board] = (sbus->board * 2 + 1);
 424                else
 425                        sbus_tid[sbus->board] = 0xff;
 426                if (sbus_tid[sbus->board] != 0xff)
 427                        sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
 428        }
 429        for_each_sbus(sbus)
 430                if (sbus_tid[sbus->board] == 0xff) {
 431                        int i = 31;
 432                                
 433                        if (!sbus_serving_map)
 434                                sbus_serving_map = cpu_present_map;
 435                        while (!(sbus_serving_map & (1 << i)))
 436                                i--;
 437                        sbus_tid[sbus->board] = i;
 438                        sbus_serving_map &= ~(1 << i);
 439                }
 440        for_each_sbus(sbus) {
 441                printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
 442                set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
 443        }
 444#else
 445        struct sbus_bus *sbus;
 446        int cpuid = cpu_logical_map(1);
 447
 448        if (cpuid == -1)
 449                cpuid = cpu_logical_map(0);
 450        for_each_sbus(sbus) {
 451                sbus_tid[sbus->board] = cpuid;
 452                set_sbi_tid(sbus->devid, cpuid << 3);
 453        }
 454        printk("All sbus IRQs directed to CPU%d\n", cpuid);
 455#endif
 456}
 457#endif
 458 
 459static void sun4d_clear_clock_irq(void)
 460{
 461        volatile unsigned int clear_intr;
 462        clear_intr = sun4d_timers->l10_timer_limit;
 463}
 464
 465static void sun4d_clear_profile_irq(int cpu)
 466{
 467        bw_get_prof_limit(cpu);
 468}
 469
 470static void sun4d_load_profile_irq(int cpu, unsigned int limit)
 471{
 472        bw_set_prof_limit(cpu, limit);
 473}
 474
 475static void __init sun4d_init_timers(irq_handler_t counter_fn)
 476{
 477        int irq;
 478        int cpu;
 479        struct resource r;
 480        int mid;
 481
 482        /* Map the User Timer registers. */
 483        memset(&r, 0, sizeof(r));
 484#ifdef CONFIG_SMP
 485        r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
 486#else
 487        r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
 488#endif
 489        r.flags = 0xf;
 490        sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
 491            PAGE_SIZE, "user timer");
 492
 493        sun4d_timers->l10_timer_limit =  (((1000000/HZ) + 1) << 10);
 494        master_l10_counter = &sun4d_timers->l10_cur_count;
 495        master_l10_limit = &sun4d_timers->l10_timer_limit;
 496
 497        irq = request_irq(TIMER_IRQ,
 498                          counter_fn,
 499                          (IRQF_DISABLED | SA_STATIC_ALLOC),
 500                          "timer", NULL);
 501        if (irq) {
 502                prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
 503                prom_halt();
 504        }
 505        
 506        /* Enable user timer free run for CPU 0 in BW */
 507        /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
 508
 509        cpu = 0;
 510        while (!cpu_find_by_instance(cpu, NULL, &mid)) {
 511                sun4d_load_profile_irq(mid >> 3, 0);
 512                cpu++;
 513        }
 514                
 515#ifdef CONFIG_SMP
 516        {
 517                unsigned long flags;
 518                extern unsigned long lvl14_save[4];
 519                struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 520                extern unsigned int real_irq_entry[], smp4d_ticker[];
 521                extern unsigned int patchme_maybe_smp_msg[];
 522
 523                /* Adjust so that we jump directly to smp4d_ticker */
 524                lvl14_save[2] += smp4d_ticker - real_irq_entry;
 525
 526                /* For SMP we use the level 14 ticker, however the bootup code
 527                 * has copied the firmware's level 14 vector into the boot cpu's
 528                 * trap table, we must fix this now or we get squashed.
 529                 */
 530                local_irq_save(flags);
 531                patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 532                trap_table->inst_one = lvl14_save[0];
 533                trap_table->inst_two = lvl14_save[1];
 534                trap_table->inst_three = lvl14_save[2];
 535                trap_table->inst_four = lvl14_save[3];
 536                local_flush_cache_all();
 537                local_irq_restore(flags);
 538        }
 539#endif
 540}
 541
 542void __init sun4d_init_sbi_irq(void)
 543{
 544        struct sbus_bus *sbus;
 545        unsigned mask;
 546
 547        nsbi = 0;
 548        for_each_sbus(sbus)
 549                nsbi++;
 550        sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
 551        if (!sbus_actions) {
 552                prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
 553                prom_halt();
 554        }
 555        for_each_sbus(sbus) {
 556#ifdef CONFIG_SMP       
 557                extern unsigned char boot_cpu_id;
 558                
 559                set_sbi_tid(sbus->devid, boot_cpu_id << 3);
 560                sbus_tid[sbus->board] = boot_cpu_id;
 561#endif
 562                /* Get rid of pending irqs from PROM */
 563                mask = acquire_sbi(sbus->devid, 0xffffffff);
 564                if (mask) {
 565                        printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
 566                        release_sbi(sbus->devid, mask);
 567                }
 568        }
 569}
 570
 571void __init sun4d_init_IRQ(void)
 572{
 573        local_irq_disable();
 574
 575        BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
 576        BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
 577        BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
 578        BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
 579        BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
 580        BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
 581        sparc_init_timers = sun4d_init_timers;
 582#ifdef CONFIG_SMP
 583        BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
 584        BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
 585        BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
 586#endif
 587        /* Cannot enable interrupts until OBP ticker is disabled. */
 588}
 589