602 lines
14 KiB
C
602 lines
14 KiB
C
/*
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* arch/sparc/kernel/sun4d_irq.c:
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* SS1000/SC2000 interrupt handling.
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*
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Heavily based on arch/sparc/kernel/irq.c.
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*/
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#include <linux/errno.h>
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#include <linux/linkage.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/seq_file.h>
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#include <asm/ptrace.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/psr.h>
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#include <asm/smp.h>
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#include <asm/vaddrs.h>
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#include <asm/timer.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/traps.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/sbus.h>
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#include <asm/sbi.h>
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#include <asm/cacheflush.h>
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#include <asm/irq_regs.h>
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#include "irq.h"
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/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
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/* #define DISTRIBUTE_IRQS */
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struct sun4d_timer_regs *sun4d_timers;
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#define TIMER_IRQ 10
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#define MAX_STATIC_ALLOC 4
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extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
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extern int static_irq_count;
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unsigned char cpu_leds[32];
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#ifdef CONFIG_SMP
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static unsigned char sbus_tid[32];
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#endif
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static struct irqaction *irq_action[NR_IRQS];
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extern spinlock_t irq_action_lock;
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static struct sbus_action {
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struct irqaction *action;
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/* For SMP this needs to be extended */
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} *sbus_actions;
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static int pil_to_sbus[] = {
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0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
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};
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static int sbus_to_pil[] = {
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0, 2, 3, 5, 7, 9, 11, 13,
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};
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static int nsbi;
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#ifdef CONFIG_SMP
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DEFINE_SPINLOCK(sun4d_imsk_lock);
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#endif
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int show_sun4d_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v, j = 0, k = 0, sbusl;
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struct irqaction * action;
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unsigned long flags;
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#ifdef CONFIG_SMP
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int x;
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#endif
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spin_lock_irqsave(&irq_action_lock, flags);
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if (i < NR_IRQS) {
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sbusl = pil_to_sbus[i];
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if (!sbusl) {
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action = *(i + irq_action);
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if (!action)
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goto out_unlock;
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} else {
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for (j = 0; j < nsbi; j++) {
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for (k = 0; k < 4; k++)
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if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
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goto found_it;
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}
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goto out_unlock;
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}
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found_it: seq_printf(p, "%3d: ", i);
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#ifndef CONFIG_SMP
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seq_printf(p, "%10u ", kstat_irqs(i));
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#else
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for_each_online_cpu(x)
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seq_printf(p, "%10u ",
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kstat_cpu(cpu_logical_map(x)).irqs[i]);
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#endif
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seq_printf(p, "%c %s",
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(action->flags & IRQF_DISABLED) ? '+' : ' ',
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action->name);
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action = action->next;
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for (;;) {
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for (; action; action = action->next) {
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seq_printf(p, ",%s %s",
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(action->flags & IRQF_DISABLED) ? " +" : "",
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action->name);
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}
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if (!sbusl) break;
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k++;
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if (k < 4)
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action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
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else {
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j++;
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if (j == nsbi) break;
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k = 0;
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action = sbus_actions [(j << 5) + (sbusl << 2)].action;
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}
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}
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seq_putc(p, '\n');
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}
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out_unlock:
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spin_unlock_irqrestore(&irq_action_lock, flags);
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return 0;
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}
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void sun4d_free_irq(unsigned int irq, void *dev_id)
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{
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struct irqaction *action, **actionp;
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struct irqaction *tmp = NULL;
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unsigned long flags;
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spin_lock_irqsave(&irq_action_lock, flags);
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if (irq < 15)
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actionp = irq + irq_action;
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else
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actionp = &(sbus_actions[irq - (1 << 5)].action);
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action = *actionp;
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if (!action) {
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printk("Trying to free free IRQ%d\n",irq);
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goto out_unlock;
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}
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if (dev_id) {
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for (; action; action = action->next) {
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if (action->dev_id == dev_id)
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break;
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tmp = action;
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}
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if (!action) {
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printk("Trying to free free shared IRQ%d\n",irq);
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goto out_unlock;
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}
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} else if (action->flags & IRQF_SHARED) {
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printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
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goto out_unlock;
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}
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if (action->flags & SA_STATIC_ALLOC)
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{
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/* This interrupt is marked as specially allocated
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* so it is a bad idea to free it.
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*/
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printk("Attempt to free statically allocated IRQ%d (%s)\n",
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irq, action->name);
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goto out_unlock;
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}
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if (action && tmp)
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tmp->next = action->next;
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else
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*actionp = action->next;
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spin_unlock_irqrestore(&irq_action_lock, flags);
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synchronize_irq(irq);
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spin_lock_irqsave(&irq_action_lock, flags);
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kfree(action);
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if (!(*actionp))
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__disable_irq(irq);
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out_unlock:
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spin_unlock_irqrestore(&irq_action_lock, flags);
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}
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extern void unexpected_irq(int, void *, struct pt_regs *);
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void sun4d_handler_irq(int irq, struct pt_regs * regs)
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{
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struct pt_regs *old_regs;
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struct irqaction * action;
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int cpu = smp_processor_id();
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/* SBUS IRQ level (1 - 7) */
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int sbusl = pil_to_sbus[irq];
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/* FIXME: Is this necessary?? */
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cc_get_ipen();
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cc_set_iclr(1 << irq);
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old_regs = set_irq_regs(regs);
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irq_enter();
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kstat_cpu(cpu).irqs[irq]++;
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if (!sbusl) {
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action = *(irq + irq_action);
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if (!action)
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unexpected_irq(irq, NULL, regs);
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do {
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action->handler(irq, action->dev_id);
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action = action->next;
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} while (action);
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} else {
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int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
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int sbino;
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struct sbus_action *actionp;
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unsigned mask, slot;
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int sbil = (sbusl << 2);
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bw_clear_intr_mask(sbusl, bus_mask);
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/* Loop for each pending SBI */
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for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
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if (bus_mask & 1) {
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mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
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mask &= (0xf << sbil);
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actionp = sbus_actions + (sbino << 5) + (sbil);
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/* Loop for each pending SBI slot */
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for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
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if (mask & slot) {
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mask &= ~slot;
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action = actionp->action;
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if (!action)
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unexpected_irq(irq, NULL, regs);
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do {
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action->handler(irq, action->dev_id);
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action = action->next;
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} while (action);
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release_sbi(SBI2DEVID(sbino), slot);
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}
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}
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}
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irq_exit();
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set_irq_regs(old_regs);
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}
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unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
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{
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int sbusl = pil_to_sbus[irq];
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if (sbusl)
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return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
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else
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return irq;
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}
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static unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev,
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unsigned int sbint)
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{
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if (sbint >= sizeof(sbus_to_pil)) {
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printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
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BUG();
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}
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return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
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}
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int sun4d_request_irq(unsigned int irq,
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irq_handler_t handler,
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unsigned long irqflags, const char * devname, void *dev_id)
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{
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struct irqaction *action, *tmp = NULL, **actionp;
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unsigned long flags;
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int ret;
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if(irq > 14 && irq < (1 << 5)) {
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ret = -EINVAL;
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goto out;
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}
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if (!handler) {
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ret = -EINVAL;
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goto out;
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}
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spin_lock_irqsave(&irq_action_lock, flags);
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if (irq >= (1 << 5))
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actionp = &(sbus_actions[irq - (1 << 5)].action);
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else
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actionp = irq + irq_action;
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action = *actionp;
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if (action) {
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if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
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for (tmp = action; tmp->next; tmp = tmp->next);
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} else {
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ret = -EBUSY;
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goto out_unlock;
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}
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if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
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printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
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ret = -EBUSY;
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goto out_unlock;
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}
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action = NULL; /* Or else! */
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}
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/* If this is flagged as statically allocated then we use our
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* private struct which is never freed.
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*/
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if (irqflags & SA_STATIC_ALLOC) {
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if (static_irq_count < MAX_STATIC_ALLOC)
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action = &static_irqaction[static_irq_count++];
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else
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printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
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}
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if (action == NULL)
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action = kmalloc(sizeof(struct irqaction),
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GFP_ATOMIC);
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if (!action) {
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ret = -ENOMEM;
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goto out_unlock;
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}
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action->handler = handler;
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action->flags = irqflags;
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cpus_clear(action->mask);
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action->name = devname;
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action->next = NULL;
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action->dev_id = dev_id;
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if (tmp)
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tmp->next = action;
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else
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*actionp = action;
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__enable_irq(irq);
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ret = 0;
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out_unlock:
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spin_unlock_irqrestore(&irq_action_lock, flags);
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out:
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return ret;
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}
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static void sun4d_disable_irq(unsigned int irq)
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{
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#ifdef CONFIG_SMP
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int tid = sbus_tid[(irq >> 5) - 1];
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unsigned long flags;
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#endif
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if (irq < NR_IRQS) return;
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#ifdef CONFIG_SMP
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spin_lock_irqsave(&sun4d_imsk_lock, flags);
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cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
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spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
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#else
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cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
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#endif
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}
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static void sun4d_enable_irq(unsigned int irq)
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{
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#ifdef CONFIG_SMP
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int tid = sbus_tid[(irq >> 5) - 1];
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unsigned long flags;
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#endif
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if (irq < NR_IRQS) return;
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#ifdef CONFIG_SMP
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spin_lock_irqsave(&sun4d_imsk_lock, flags);
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cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
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spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
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#else
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cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
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#endif
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}
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#ifdef CONFIG_SMP
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static void sun4d_set_cpu_int(int cpu, int level)
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{
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sun4d_send_ipi(cpu, level);
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}
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static void sun4d_clear_ipi(int cpu, int level)
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{
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}
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static void sun4d_set_udt(int cpu)
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{
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}
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/* Setup IRQ distribution scheme. */
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void __init sun4d_distribute_irqs(void)
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{
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struct device_node *dp;
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#ifdef DISTRIBUTE_IRQS
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cpumask_t sbus_serving_map;
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sbus_serving_map = cpu_present_map;
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for_each_node_by_name(dp, "sbi") {
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int board = of_getintprop_default(dp, "board#", 0);
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if ((board * 2) == boot_cpu_id && cpu_isset(board * 2 + 1, cpu_present_map))
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sbus_tid[board] = (board * 2 + 1);
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else if (cpu_isset(board * 2, cpu_present_map))
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sbus_tid[board] = (board * 2);
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else if (cpu_isset(board * 2 + 1, cpu_present_map))
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sbus_tid[board] = (board * 2 + 1);
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else
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sbus_tid[board] = 0xff;
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if (sbus_tid[board] != 0xff)
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cpu_clear(sbus_tid[board], sbus_serving_map);
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}
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for_each_node_by_name(dp, "sbi") {
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int board = of_getintprop_default(dp, "board#", 0);
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if (sbus_tid[board] == 0xff) {
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int i = 31;
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if (cpus_empty(sbus_serving_map))
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sbus_serving_map = cpu_present_map;
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while (cpu_isset(i, sbus_serving_map))
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i--;
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sbus_tid[board] = i;
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cpu_clear(i, sbus_serving_map);
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}
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}
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for_each_node_by_name(dp, "sbi") {
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int devid = of_getintprop_default(dp, "device-id", 0);
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int board = of_getintprop_default(dp, "board#", 0);
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printk("sbus%d IRQs directed to CPU%d\n", board, sbus_tid[board]);
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set_sbi_tid(devid, sbus_tid[board] << 3);
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}
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#else
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int cpuid = cpu_logical_map(1);
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if (cpuid == -1)
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cpuid = cpu_logical_map(0);
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for_each_node_by_name(dp, "sbi") {
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int devid = of_getintprop_default(dp, "device-id", 0);
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int board = of_getintprop_default(dp, "board#", 0);
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sbus_tid[board] = cpuid;
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set_sbi_tid(devid, cpuid << 3);
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}
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printk("All sbus IRQs directed to CPU%d\n", cpuid);
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#endif
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}
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#endif
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static void sun4d_clear_clock_irq(void)
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{
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volatile unsigned int clear_intr;
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clear_intr = sun4d_timers->l10_timer_limit;
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}
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static void sun4d_clear_profile_irq(int cpu)
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{
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bw_get_prof_limit(cpu);
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}
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static void sun4d_load_profile_irq(int cpu, unsigned int limit)
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{
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bw_set_prof_limit(cpu, limit);
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}
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static void __init sun4d_init_timers(irq_handler_t counter_fn)
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{
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int irq;
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int cpu;
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struct resource r;
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int mid;
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/* Map the User Timer registers. */
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memset(&r, 0, sizeof(r));
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#ifdef CONFIG_SMP
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r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
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#else
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r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
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#endif
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r.flags = 0xf;
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sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
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PAGE_SIZE, "user timer");
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sun4d_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10);
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master_l10_counter = &sun4d_timers->l10_cur_count;
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master_l10_limit = &sun4d_timers->l10_timer_limit;
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irq = request_irq(TIMER_IRQ,
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counter_fn,
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(IRQF_DISABLED | SA_STATIC_ALLOC),
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"timer", NULL);
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if (irq) {
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prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
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prom_halt();
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}
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/* Enable user timer free run for CPU 0 in BW */
|
|
/* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
|
|
|
|
cpu = 0;
|
|
while (!cpu_find_by_instance(cpu, NULL, &mid)) {
|
|
sun4d_load_profile_irq(mid >> 3, 0);
|
|
cpu++;
|
|
}
|
|
|
|
#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 firmware's level 14 vector into the boot cpu's
|
|
* trap table, we must fix this now or we get squashed.
|
|
*/
|
|
local_irq_save(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();
|
|
local_irq_restore(flags);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void __init sun4d_init_sbi_irq(void)
|
|
{
|
|
struct device_node *dp;
|
|
|
|
nsbi = 0;
|
|
for_each_node_by_name(dp, "sbi")
|
|
nsbi++;
|
|
sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
|
|
if (!sbus_actions) {
|
|
prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
|
|
prom_halt();
|
|
}
|
|
for_each_node_by_name(dp, "sbi") {
|
|
int devid = of_getintprop_default(dp, "device-id", 0);
|
|
int board = of_getintprop_default(dp, "board#", 0);
|
|
unsigned int mask;
|
|
|
|
#ifdef CONFIG_SMP
|
|
{
|
|
extern unsigned char boot_cpu_id;
|
|
|
|
set_sbi_tid(devid, boot_cpu_id << 3);
|
|
sbus_tid[board] = boot_cpu_id;
|
|
}
|
|
#endif
|
|
/* Get rid of pending irqs from PROM */
|
|
mask = acquire_sbi(devid, 0xffffffff);
|
|
if (mask) {
|
|
printk ("Clearing pending IRQs %08x on SBI %d\n", mask, board);
|
|
release_sbi(devid, mask);
|
|
}
|
|
}
|
|
}
|
|
|
|
void __init sun4d_init_IRQ(void)
|
|
{
|
|
local_irq_disable();
|
|
|
|
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);
|
|
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. */
|
|
}
|