/* * linux/arch/mips/philips/nino/irq.c * * Copyright (C) 1992 Linus Torvalds * Copyright (C) 1999 Harald Koerfgen (Harald.Koerfgen@home.ivm.de) * Copyright (C) 2000 Pavel Machek (pavel@suse.cz) * Copyright (C) 2001 Steven Hill (sjhill@realitydiluted.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Generic interrupt handler for PR31700. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include unsigned long spurious_count = 0; irq_cpustat_t irq_stat [NR_CPUS]; static inline void mask_irq(unsigned int irq_nr) { switch (irq_nr) { case 0: /* Periodic Timer Interrupt */ IntClear5 = INT5_PERIODICINT; IntClear6 = INT6_PERIODICINT; IntEnable6 &= ~INT6_PERIODICINT; break; case 3: /* Serial port receive interrupt */ break; case 2: /* Serial port transmit interrupt */ break; default: printk( "Attempt to mask unknown IRQ %d?\n", irq_nr ); } } static inline void unmask_irq(unsigned int irq_nr) { switch (irq_nr) { case 0: IntEnable6 |= INT6_PERIODICINT; break; case 3: /* Serial port receive interrupt */ /* FIXME: currently handled in driver */ break; case 2: /* Serial port transmit interrupt */ /* FIXME: currently handled in driver */ break; default: printk( "Attempt to unmask unknown IRQ %d?\n", irq_nr ); } } void disable_irq(unsigned int irq_nr) { unsigned long flags; save_and_cli(flags); mask_irq(irq_nr); restore_flags(flags); } void enable_irq(unsigned int irq_nr) { unsigned long flags; save_and_cli(flags); unmask_irq(irq_nr); restore_flags(flags); } /* * Pointers to the low-level handlers: first the general ones, then the * fast ones, then the bad ones. */ extern void interrupt(void); static struct irqaction *irq_action[NR_IRQS] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; int get_irq_list(char *buf) { int i, len = 0; struct irqaction *action; for (i = 0; i < NR_IRQS; i++) { action = irq_action[i]; if (!action) continue; len += sprintf(buf + len, "%2d: %8d %c %s", i, kstat.irqs[0][i], (action->flags & SA_INTERRUPT) ? '+' : ' ', action->name); for (action = action->next; action; action = action->next) { len += sprintf(buf + len, ",%s %s", (action->flags & SA_INTERRUPT) ? " +" : "", action->name); } len += sprintf(buf + len, "\n"); } return len; } atomic_t __mips_bh_counter; /* * do_IRQ handles IRQ's that have been installed without the * SA_INTERRUPT flag: it uses the full signal-handling return * and runs with other interrupts enabled. All relatively slow * IRQ's should use this format: notably the keyboard/timer * routines. */ asmlinkage void do_IRQ(int irq, struct pt_regs *regs) { struct irqaction *action; int do_random, cpu; cpu = smp_processor_id(); irq_enter(cpu, irq); kstat.irqs[cpu][irq]++; if (irq == 20) { printk("20 %08lx %08lx\n %08lx %08lx\n %08lx\n", IntStatus1, IntStatus2, IntStatus3, IntStatus4, IntStatus5 ); printk("20 %08lx %08lx\n %08lx %08lx\n %08lx\n", IntEnable1, IntEnable2, IntEnable3, IntEnable4, IntEnable5 ); } mask_irq(irq); action = *(irq + irq_action); if (action) { if (!(action->flags & SA_INTERRUPT)) __sti(); do_random = 0; do { do_random |= action->flags; action->handler(irq, action->dev_id, regs); action = action->next; } while (action); if (do_random & SA_SAMPLE_RANDOM) add_interrupt_randomness(irq); unmask_irq(irq); __cli(); } else { IntClear3 = ~0; IntClear4 = ~0; IntClear5 = ~0; unmask_irq(irq); } irq_exit(cpu, irq); /* unmasking and bottom half handling is done magically for us. */ } /* * Idea is to put all interrupts * in a single table and differenciate them just by number. */ int setup_nino_irq(int irq, struct irqaction *new) { int shared = 0; struct irqaction *old, **p; unsigned long flags; p = irq_action + irq; if ((old = *p) != NULL) { /* Can't share interrupts unless both agree to */ if (!(old->flags & new->flags & SA_SHIRQ)) return -EBUSY; /* Can't share interrupts unless both are same type */ if ((old->flags ^ new->flags) & SA_INTERRUPT) return -EBUSY; /* add new interrupt at end of irq queue */ do { p = &old->next; old = *p; } while (old); shared = 1; } if (new->flags & SA_SAMPLE_RANDOM) rand_initialize_irq(irq); save_and_cli(flags); *p = new; if (!shared) { unmask_irq(irq); } restore_flags(flags); return 0; } int request_irq(unsigned int irq, void (*handler) (int, void *, struct pt_regs *), unsigned long irqflags, const char *devname, void *dev_id) { int retval; struct irqaction *action; if (irq >= NR_IRQS) return -EINVAL; if (!handler) return -EINVAL; action = (struct irqaction *) kmalloc(sizeof(struct irqaction), GFP_KERNEL); if (!action) return -ENOMEM; action->handler = handler; action->flags = irqflags; action->mask = 0; action->name = devname; action->next = NULL; action->dev_id = dev_id; retval = setup_nino_irq(irq, action); if (retval) kfree(action); return retval; } void free_irq(unsigned int irq, void *dev_id) { struct irqaction *action, **p; unsigned long flags; if (irq >= NR_IRQS) { printk(KERN_CRIT __FUNCTION__ ": trying to free IRQ%d\n", irq); return; } for (p = irq + irq_action; (action = *p) != NULL; p = &action->next) { if (action->dev_id != dev_id) continue; /* Found it - now free it */ save_and_cli(flags); *p = action->next; if (!irq[irq_action]) mask_irq(irq); restore_flags(flags); kfree(action); return; } printk(KERN_CRIT __FUNCTION__ ": trying to free free IRQ%d\n", irq); } unsigned long probe_irq_on(void) { /* TODO */ return 0; } int probe_irq_off(unsigned long irqs) { /* TODO */ return 0; } void __init init_IRQ(void) { irq_setup(); }