From b5dc7840b3ebe9c7967dd8ba73db957767009ff9 Mon Sep 17 00:00:00 2001 From: Roman Zippel Date: Sun, 25 Jun 2006 05:47:00 -0700 Subject: [PATCH] m68k: introduce irq controller Introduce irq controller and use it to manage auto vector interrupts. Introduce setup_irq() which can be used for irq setup. Signed-off-by: Roman Zippel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/m68k/kernel/ints.c | 171 ++++++++++++++++++++++++++++++++++-------------- 1 file changed, 123 insertions(+), 48 deletions(-) (limited to 'arch/m68k/kernel') diff --git a/arch/m68k/kernel/ints.c b/arch/m68k/kernel/ints.c index 3ce7c6166bb9..c7f6ee67fd5a 100644 --- a/arch/m68k/kernel/ints.c +++ b/arch/m68k/kernel/ints.c @@ -45,7 +45,15 @@ #endif /* table for system interrupt handlers */ -static irq_handler_t irq_list[SYS_IRQS]; +static struct irq_node *irq_list[SYS_IRQS]; +static struct irq_controller *irq_controller[SYS_IRQS]; + +static struct irq_controller auto_irq_controller = { + .name = "auto", + .lock = SPIN_LOCK_UNLOCKED, + .startup = m68k_irq_startup, + .shutdown = m68k_irq_shutdown, +}; static const char *default_names[SYS_IRQS] = { [0] = "spurious int", @@ -101,17 +109,13 @@ void __init init_IRQ(void) hardirq_mask_is_broken(); } - for (i = 0; i < SYS_IRQS; i++) { - if (mach_default_handler) - irq_list[i].handler = (*mach_default_handler)[i]; - irq_list[i].flags = 0; - irq_list[i].dev_id = NULL; - irq_list[i].devname = default_names[i]; + for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++) { + irq_controller[i] = &auto_irq_controller; + if (mach_default_handler && (*mach_default_handler)[i]) + cpu_request_irq(i, (*mach_default_handler)[i], + 0, default_names[i], NULL); } - for (i = 0; i < NUM_IRQ_NODES; i++) - nodes[i].handler = NULL; - mach_init_IRQ (); } @@ -120,9 +124,12 @@ irq_node_t *new_irq_node(void) irq_node_t *node; short i; - for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) - if (!node->handler) + for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) { + if (!node->handler) { + memset(node, 0, sizeof(*node)); return node; + } + } printk ("new_irq_node: out of nodes\n"); return NULL; @@ -149,55 +156,115 @@ void free_irq(unsigned int irq, void *dev_id) EXPORT_SYMBOL(free_irq); -int cpu_request_irq(unsigned int irq, - irqreturn_t (*handler)(int, void *, struct pt_regs *), - unsigned long flags, const char *devname, void *dev_id) +int setup_irq(unsigned int irq, struct irq_node *node) { - if (irq < IRQ_AUTO_1 || irq > IRQ_AUTO_7) { + struct irq_controller *contr; + struct irq_node **prev; + unsigned long flags; + + if (irq >= SYS_IRQS || !(contr = irq_controller[irq])) { printk("%s: Incorrect IRQ %d from %s\n", - __FUNCTION__, irq, devname); + __FUNCTION__, irq, node->devname); return -ENXIO; } -#if 0 - if (!(irq_list[irq].flags & IRQ_FLG_STD)) { - if (irq_list[irq].flags & IRQ_FLG_LOCK) { - printk("%s: IRQ %d from %s is not replaceable\n", - __FUNCTION__, irq, irq_list[irq].devname); - return -EBUSY; - } - if (!(flags & IRQ_FLG_REPLACE)) { - printk("%s: %s can't replace IRQ %d from %s\n", - __FUNCTION__, devname, irq, irq_list[irq].devname); + spin_lock_irqsave(&contr->lock, flags); + + prev = irq_list + irq; + if (*prev) { + /* Can't share interrupts unless both agree to */ + if (!((*prev)->flags & node->flags & SA_SHIRQ)) { + spin_unlock_irqrestore(&contr->lock, flags); return -EBUSY; } + while (*prev) + prev = &(*prev)->next; } -#endif - irq_list[irq].handler = handler; - irq_list[irq].flags = flags; - irq_list[irq].dev_id = dev_id; - irq_list[irq].devname = devname; + if (!irq_list[irq]) { + if (contr->startup) + contr->startup(irq); + else + contr->enable(irq); + } + node->next = NULL; + *prev = node; + + spin_unlock_irqrestore(&contr->lock, flags); + return 0; } +int cpu_request_irq(unsigned int irq, + irqreturn_t (*handler)(int, void *, struct pt_regs *), + unsigned long flags, const char *devname, void *dev_id) +{ + struct irq_node *node; + int res; + + node = new_irq_node(); + if (!node) + return -ENOMEM; + + node->handler = handler; + node->flags = flags; + node->dev_id = dev_id; + node->devname = devname; + + res = setup_irq(irq, node); + if (res) + node->handler = NULL; + + return res; +} + void cpu_free_irq(unsigned int irq, void *dev_id) { - if (irq < IRQ_AUTO_1 || irq > IRQ_AUTO_7) { + struct irq_controller *contr; + struct irq_node **p, *node; + unsigned long flags; + + if (irq >= SYS_IRQS || !(contr = irq_controller[irq])) { printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq); return; } - if (irq_list[irq].dev_id != dev_id) - printk("%s: Removing probably wrong IRQ %d from %s\n", - __FUNCTION__, irq, irq_list[irq].devname); + spin_lock_irqsave(&contr->lock, flags); + + p = irq_list + irq; + while ((node = *p)) { + if (node->dev_id == dev_id) + break; + p = &node->next; + } + + if (node) { + *p = node->next; + node->handler = NULL; + } else + printk("%s: Removing probably wrong IRQ %d\n", + __FUNCTION__, irq); + + if (!irq_list[irq]) + contr->shutdown(irq); - irq_list[irq].handler = (*mach_default_handler)[irq]; - irq_list[irq].flags = 0; - irq_list[irq].dev_id = NULL; - irq_list[irq].devname = default_names[irq]; + spin_unlock_irqrestore(&contr->lock, flags); } +int m68k_irq_startup(unsigned int irq) +{ + if (irq <= IRQ_AUTO_7) + vectors[VEC_SPUR + irq] = auto_inthandler; + return 0; +} + +void m68k_irq_shutdown(unsigned int irq) +{ + if (irq <= IRQ_AUTO_7) + vectors[VEC_SPUR + irq] = bad_inthandler; +} + + /* * Do we need these probe functions on the m68k? * @@ -250,8 +317,14 @@ static void dummy_free_irq(unsigned int irq, void *dev_id) asmlinkage void m68k_handle_int(unsigned int irq, struct pt_regs *regs) { + struct irq_node *node; + kstat_cpu(0).irqs[irq]++; - irq_list[irq].handler(irq, irq_list[irq].dev_id, regs); + node = irq_list[irq]; + do { + node->handler(irq, node->dev_id, regs); + node = node->next; + } while (node); } asmlinkage void handle_badint(struct pt_regs *regs) @@ -262,16 +335,18 @@ asmlinkage void handle_badint(struct pt_regs *regs) int show_interrupts(struct seq_file *p, void *v) { + struct irq_controller *contr; + struct irq_node *node; int i = *(loff_t *) v; /* autovector interrupts */ - if (i < SYS_IRQS) { - if (mach_default_handler) { - seq_printf(p, "auto %2d: %10u ", i, - i ? kstat_cpu(0).irqs[i] : num_spurious); - seq_puts(p, " "); - seq_printf(p, "%s\n", irq_list[i].devname); - } + if (i < SYS_IRQS && irq_list[i]) { + contr = irq_controller[i]; + node = irq_list[i]; + seq_printf(p, "%s %u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname); + while ((node = node->next)) + seq_printf(p, ", %s", node->devname); + seq_puts(p, "\n"); } else if (i == SYS_IRQS) mach_get_irq_list(p, v); 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