/* $Id: sun4d_irq.c,v 1.28 2001/07/17 16:17:33 anton Exp $ * arch/sparc/kernel/sun4d_irq.c: * SS1000/SC2000 interrupt handling. * * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) * Heavily based on arch/sparc/kernel/irq.c. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */ /* #define DISTRIBUTE_IRQS */ struct sun4d_timer_regs *sun4d_timers; #define TIMER_IRQ 10 #define MAX_STATIC_ALLOC 4 extern struct irqaction static_irqaction[MAX_STATIC_ALLOC]; extern int static_irq_count; unsigned char cpu_leds[32]; #ifdef CONFIG_SMP unsigned char sbus_tid[32]; #endif extern struct irqaction *irq_action[]; struct sbus_action { struct irqaction *action; /* For SMP this needs to be extended */ } *sbus_actions; static int pil_to_sbus[] = { 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0, }; static int sbus_to_pil[] = { 0, 2, 3, 5, 7, 9, 11, 13, }; static int nsbi; #ifdef CONFIG_SMP spinlock_t sun4d_imsk_lock = SPIN_LOCK_UNLOCKED; #endif int sun4d_get_irq_list(char *buf) { int i, j = 0, k = 0, len = 0, sbusl; struct irqaction * action; #ifdef CONFIG_SMP int x; #endif for (i = 0 ; i < NR_IRQS ; i++) { sbusl = pil_to_sbus[i]; if (!sbusl) { action = *(i + irq_action); if (!action) continue; } else { for (j = 0; j < nsbi; j++) { for (k = 0; k < 4; k++) if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action)) goto found_it; } continue; } found_it: len += sprintf(buf+len, "%3d: ", i); #ifndef CONFIG_SMP len += sprintf(buf+len, "%10u ", kstat_irqs(i)); #else for (x = 0; x < smp_num_cpus; x++) len += sprintf(buf+len, "%10u ", kstat.irqs[cpu_logical_map(x)][i]); #endif len += sprintf(buf+len, "%c %s", (action->flags & SA_INTERRUPT) ? '+' : ' ', action->name); action = action->next; for (;;) { for (; action; action = action->next) { len += sprintf(buf+len, ",%s %s", (action->flags & SA_INTERRUPT) ? " +" : "", action->name); } if (!sbusl) break; k++; if (k < 4) action = sbus_actions [(j << 5) + (sbusl << 2) + k].action; else { j++; if (j == nsbi) break; k = 0; action = sbus_actions [(j << 5) + (sbusl << 2)].action; } } len += sprintf(buf+len, "\n"); } return len; } void sun4d_free_irq(unsigned int irq, void *dev_id) { struct irqaction *action, **actionp; struct irqaction *tmp = NULL; unsigned long flags; if (irq < 15) actionp = irq + irq_action; else actionp = &(sbus_actions[irq - (1 << 5)].action); action = *actionp; if (!action) { printk("Trying to free free IRQ%d\n",irq); return; } if (dev_id) { for (; action; action = action->next) { if (action->dev_id == dev_id) break; tmp = action; } if (!action) { printk("Trying to free free shared IRQ%d\n",irq); return; } } else if (action->flags & SA_SHIRQ) { printk("Trying to free shared IRQ%d with NULL device ID\n", irq); return; } if (action->flags & SA_STATIC_ALLOC) { /* This interrupt is marked as specially allocated * so it is a bad idea to free it. */ printk("Attempt to free statically allocated IRQ%d (%s)\n", irq, action->name); return; } save_and_cli(flags); if (action && tmp) tmp->next = action->next; else *actionp = action->next; kfree(action); if (!(*actionp)) disable_irq(irq); restore_flags(flags); } extern void unexpected_irq(int, void *, struct pt_regs *); void sun4d_handler_irq(int irq, struct pt_regs * regs) { struct irqaction * action; int cpu = smp_processor_id(); /* SBUS IRQ level (1 - 7) */ int sbusl = pil_to_sbus[irq]; /* FIXME: Is this necessary?? */ cc_get_ipen(); cc_set_iclr(1 << irq); irq_enter(cpu, irq); kstat.irqs[cpu][irq]++; if (!sbusl) { action = *(irq + irq_action); if (!action) unexpected_irq(irq, 0, regs); do { action->handler(irq, action->dev_id, regs); action = action->next; } while (action); } else { int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff; int sbino; struct sbus_action *actionp; unsigned mask, slot; int sbil = (sbusl << 2); bw_clear_intr_mask(sbusl, bus_mask); /* Loop for each pending SBI */ for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1) if (bus_mask & 1) { mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil); mask &= (0xf << sbil); actionp = sbus_actions + (sbino << 5) + (sbil); /* Loop for each pending SBI slot */ for (slot = (1 << sbil); mask; slot <<= 1, actionp++) if (mask & slot) { mask &= ~slot; action = actionp->action; if (!action) unexpected_irq(irq, 0, regs); do { action->handler(irq, action->dev_id, regs); action = action->next; } while (action); release_sbi(SBI2DEVID(sbino), slot); } } } irq_exit(cpu, irq); if (softirq_pending(cpu)) do_softirq(); } unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq) { int sbusl = pil_to_sbus[irq]; if (sbusl) return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot; else return irq; } unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint) { if (sbint >= sizeof(sbus_to_pil)) { printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint); BUG(); } return sun4d_build_irq(sdev, sbus_to_pil[sbint]); } int sun4d_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long irqflags, const char * devname, void *dev_id) { struct irqaction *action, *tmp = NULL, **actionp; unsigned long flags; if(irq > 14 && irq < (1 << 5)) return -EINVAL; if (!handler) return -EINVAL; if (irq >= (1 << 5)) actionp = &(sbus_actions[irq - (1 << 5)].action); else actionp = irq + irq_action; action = *actionp; if (action) { if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) { for (tmp = action; tmp->next; tmp = tmp->next); } else { return -EBUSY; } if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) { printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq); return -EBUSY; } action = NULL; /* Or else! */ } save_and_cli(flags); /* If this is flagged as statically allocated then we use our * private struct which is never freed. */ if (irqflags & SA_STATIC_ALLOC) { if (static_irq_count < MAX_STATIC_ALLOC) action = &static_irqaction[static_irq_count++]; else printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",irq, devname); } if (action == NULL) action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL); if (!action) { restore_flags(flags); return -ENOMEM; } action->handler = handler; action->flags = irqflags; action->mask = 0; action->name = devname; action->next = NULL; action->dev_id = dev_id; if (tmp) tmp->next = action; else *actionp = action; enable_irq(irq); restore_flags(flags); return 0; } static void sun4d_disable_irq(unsigned int irq) { #ifdef CONFIG_SMP int tid = sbus_tid[(irq >> 5) - 1]; unsigned long flags; #endif if (irq < NR_IRQS) return; #ifdef CONFIG_SMP spin_lock_irqsave(&sun4d_imsk_lock, flags); cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7])); spin_unlock_irqrestore(&sun4d_imsk_lock, flags); #else cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7])); #endif } static void sun4d_enable_irq(unsigned int irq) { #ifdef CONFIG_SMP int tid = sbus_tid[(irq >> 5) - 1]; unsigned long flags; #endif if (irq < NR_IRQS) return; #ifdef CONFIG_SMP spin_lock_irqsave(&sun4d_imsk_lock, flags); cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7])); spin_unlock_irqrestore(&sun4d_imsk_lock, flags); #else cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7])); #endif } #ifdef CONFIG_SMP static void sun4d_set_cpu_int(int cpu, int level) { sun4d_send_ipi(cpu, level); } static void sun4d_clear_ipi(int cpu, int level) { } static void sun4d_set_udt(int cpu) { } /* Setup IRQ distribution scheme. */ void __init sun4d_distribute_irqs(void) { #ifdef DISTRIBUTE_IRQS struct sbus_bus *sbus; unsigned long sbus_serving_map; sbus_serving_map = cpu_present_map; for_each_sbus(sbus) { if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1)))) sbus_tid[sbus->board] = (sbus->board * 2 + 1); else if (cpu_present_map & (1 << (sbus->board * 2))) sbus_tid[sbus->board] = (sbus->board * 2); else if (cpu_present_map & (1 << (sbus->board * 2 + 1))) sbus_tid[sbus->board] = (sbus->board * 2 + 1); else sbus_tid[sbus->board] = 0xff; if (sbus_tid[sbus->board] != 0xff) sbus_serving_map &= ~(1 << sbus_tid[sbus->board]); } for_each_sbus(sbus) if (sbus_tid[sbus->board] == 0xff) { int i = 31; if (!sbus_serving_map) sbus_serving_map = cpu_present_map; while (!(sbus_serving_map & (1 << i))) i--; sbus_tid[sbus->board] = i; sbus_serving_map &= ~(1 << i); } for_each_sbus(sbus) { printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]); set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3); } #else struct sbus_bus *sbus; int cpuid = cpu_logical_map(1); if (cpuid == -1) cpuid = cpu_logical_map(0); for_each_sbus(sbus) { sbus_tid[sbus->board] = cpuid; set_sbi_tid(sbus->devid, cpuid << 3); } printk("All sbus IRQs directed to CPU%d\n", cpuid); #endif } #endif static void sun4d_clear_clock_irq(void) { volatile unsigned int clear_intr; clear_intr = sun4d_timers->l10_timer_limit; } static void sun4d_clear_profile_irq(int cpu) { bw_get_prof_limit(cpu); } static void sun4d_load_profile_irq(int cpu, unsigned int limit) { bw_set_prof_limit(cpu, limit); } static void __init sun4d_init_timers(void (*counter_fn)(int, void *, struct pt_regs *)) { int irq; extern struct prom_cpuinfo linux_cpus[NR_CPUS]; int cpu; struct resource r; /* Map the User Timer registers. */ memset(&r, 0, sizeof(r)); #ifdef CONFIG_SMP r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT; #else r.start = CSR_BASE(0)+BW_TIMER_LIMIT; #endif r.flags = 0xf; sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0, PAGE_SIZE, "user timer"); sun4d_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10); master_l10_counter = &sun4d_timers->l10_cur_count; master_l10_limit = &sun4d_timers->l10_timer_limit; irq = request_irq(TIMER_IRQ, counter_fn, (SA_INTERRUPT | SA_STATIC_ALLOC), "timer", NULL); if (irq) { prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ); prom_halt(); } /* Enable user timer free run for CPU 0 in BW */ /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */ for(cpu = 0; cpu < linux_num_cpus; cpu++) sun4d_load_profile_irq((linux_cpus[cpu].mid >> 3), 0); #ifdef CONFIG_SMP { unsigned long flags; extern unsigned long lvl14_save[4]; struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)]; extern unsigned int real_irq_entry[], smp4d_ticker[]; extern unsigned int patchme_maybe_smp_msg[]; /* Adjust so that we jump directly to smp4d_ticker */ lvl14_save[2] += smp4d_ticker - real_irq_entry; /* For SMP we use the level 14 ticker, however the bootup code * has copied the firmwares level 14 vector into boot cpu's * trap table, we must fix this now or we get squashed. */ __save_and_cli(flags); patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */ trap_table->inst_one = lvl14_save[0]; trap_table->inst_two = lvl14_save[1]; trap_table->inst_three = lvl14_save[2]; trap_table->inst_four = lvl14_save[3]; local_flush_cache_all(); __restore_flags(flags); } #endif } void __init sun4d_init_sbi_irq(void) { struct sbus_bus *sbus; unsigned mask; nsbi = 0; for_each_sbus(sbus) nsbi++; sbus_actions = (struct sbus_action *)kmalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC); memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action))); for_each_sbus(sbus) { #ifdef CONFIG_SMP extern unsigned char boot_cpu_id; set_sbi_tid(sbus->devid, boot_cpu_id << 3); sbus_tid[sbus->board] = boot_cpu_id; #endif /* Get rid of pending irqs from PROM */ mask = acquire_sbi(sbus->devid, 0xffffffff); if (mask) { printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board); release_sbi(sbus->devid, mask); } } } static char *sun4d_irq_itoa(unsigned int irq) { static char buff[16]; if (irq < (1 << 5)) sprintf(buff, "%d", irq); else sprintf(buff, "%d,%x", sbus_to_pil[(irq >> 2) & 7], irq); return buff; } void __init sun4d_init_IRQ(void) { __cli(); BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(__irq_itoa, sun4d_irq_itoa, BTFIXUPCALL_NORM); sparc_init_timers = sun4d_init_timers; #ifdef CONFIG_SMP BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP); BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP); #endif /* Cannot enable interrupts until OBP ticker is disabled. */ }