sun4d_irq.c
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- /* $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 <linux/config.h>
- #include <linux/ptrace.h>
- #include <linux/errno.h>
- #include <linux/linkage.h>
- #include <linux/kernel_stat.h>
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <linux/interrupt.h>
- #include <linux/slab.h>
- #include <linux/random.h>
- #include <linux/init.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/spinlock.h>
- #include <asm/ptrace.h>
- #include <asm/processor.h>
- #include <asm/system.h>
- #include <asm/psr.h>
- #include <asm/smp.h>
- #include <asm/vaddrs.h>
- #include <asm/timer.h>
- #include <asm/openprom.h>
- #include <asm/oplib.h>
- #include <asm/traps.h>
- #include <asm/irq.h>
- #include <asm/io.h>
- #include <asm/pgalloc.h>
- #include <asm/pgtable.h>
- #include <asm/sbus.h>
- #include <asm/sbi.h>
- /* 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%dn",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%dn",irq);
- return;
- }
- } else if (action->flags & SA_SHIRQ) {
- printk("Trying to free shared IRQ%d with NULL device IDn", 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;
- }
- 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 deniedn", 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 kmallocn",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%dn", 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%dn", 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%dn",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 %dn", 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(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);
- 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. */
- }