diff options
Diffstat (limited to 'kernel/irq/chip.c')
| -rw-r--r-- | kernel/irq/chip.c | 631 |
1 files changed, 631 insertions, 0 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c new file mode 100644 index 0000000..10b5092 --- /dev/null +++ b/kernel/irq/chip.c @@ -0,0 +1,631 @@ +/* + * linux/kernel/irq/chip.c + * + * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar + * Copyright (C) 2005-2006, Thomas Gleixner, Russell King + * + * This file contains the core interrupt handling code, for irq-chip + * based architectures. + * + * Detailed information is available in Documentation/DocBook/genericirq + */ + +#include <linux/irq.h> +#include <linux/msi.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/kernel_stat.h> + +#include "internals.h" + +/** + * dynamic_irq_init - initialize a dynamically allocated irq + * @irq: irq number to initialize + */ +void dynamic_irq_init(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq); + return; + } + + /* Ensure we don't have left over values from a previous use of this irq */ + spin_lock_irqsave(&desc->lock, flags); + desc->status = IRQ_DISABLED; + desc->chip = &no_irq_chip; + desc->handle_irq = handle_bad_irq; + desc->depth = 1; + desc->msi_desc = NULL; + desc->handler_data = NULL; + desc->chip_data = NULL; + desc->action = NULL; + desc->irq_count = 0; + desc->irqs_unhandled = 0; +#ifdef CONFIG_SMP + cpus_setall(desc->affinity); +#endif + spin_unlock_irqrestore(&desc->lock, flags); +} + +/** + * dynamic_irq_cleanup - cleanup a dynamically allocated irq + * @irq: irq number to initialize + */ +void dynamic_irq_cleanup(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq); + return; + } + + spin_lock_irqsave(&desc->lock, flags); + if (desc->action) { + spin_unlock_irqrestore(&desc->lock, flags); + WARN(1, KERN_ERR "Destroying IRQ%d without calling free_irq\n", + irq); + return; + } + desc->msi_desc = NULL; + desc->handler_data = NULL; + desc->chip_data = NULL; + desc->handle_irq = handle_bad_irq; + desc->chip = &no_irq_chip; + desc->name = NULL; + spin_unlock_irqrestore(&desc->lock, flags); +} + + +/** + * set_irq_chip - set the irq chip for an irq + * @irq: irq number + * @chip: pointer to irq chip description structure + */ +int set_irq_chip(unsigned int irq, struct irq_chip *chip) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq); + return -EINVAL; + } + + if (!chip) + chip = &no_irq_chip; + + spin_lock_irqsave(&desc->lock, flags); + irq_chip_set_defaults(chip); + desc->chip = chip; + spin_unlock_irqrestore(&desc->lock, flags); + + return 0; +} +EXPORT_SYMBOL(set_irq_chip); + +/** + * set_irq_type - set the irq trigger type for an irq + * @irq: irq number + * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h + */ +int set_irq_type(unsigned int irq, unsigned int type) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + int ret = -ENXIO; + + if (!desc) { + printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq); + return -ENODEV; + } + + if (type == IRQ_TYPE_NONE) + return 0; + + spin_lock_irqsave(&desc->lock, flags); + ret = __irq_set_trigger(desc, irq, type); + spin_unlock_irqrestore(&desc->lock, flags); + return ret; +} +EXPORT_SYMBOL(set_irq_type); + +/** + * set_irq_data - set irq type data for an irq + * @irq: Interrupt number + * @data: Pointer to interrupt specific data + * + * Set the hardware irq controller data for an irq + */ +int set_irq_data(unsigned int irq, void *data) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + printk(KERN_ERR + "Trying to install controller data for IRQ%d\n", irq); + return -EINVAL; + } + + spin_lock_irqsave(&desc->lock, flags); + desc->handler_data = data; + spin_unlock_irqrestore(&desc->lock, flags); + return 0; +} +EXPORT_SYMBOL(set_irq_data); + +/** + * set_irq_data - set irq type data for an irq + * @irq: Interrupt number + * @entry: Pointer to MSI descriptor data + * + * Set the hardware irq controller data for an irq + */ +int set_irq_msi(unsigned int irq, struct msi_desc *entry) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + printk(KERN_ERR + "Trying to install msi data for IRQ%d\n", irq); + return -EINVAL; + } + + spin_lock_irqsave(&desc->lock, flags); + desc->msi_desc = entry; + if (entry) + entry->irq = irq; + spin_unlock_irqrestore(&desc->lock, flags); + return 0; +} + +/** + * set_irq_chip_data - set irq chip data for an irq + * @irq: Interrupt number + * @data: Pointer to chip specific data + * + * Set the hardware irq chip data for an irq + */ +int set_irq_chip_data(unsigned int irq, void *data) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + printk(KERN_ERR + "Trying to install chip data for IRQ%d\n", irq); + return -EINVAL; + } + + if (!desc->chip) { + printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq); + return -EINVAL; + } + + spin_lock_irqsave(&desc->lock, flags); + desc->chip_data = data; + spin_unlock_irqrestore(&desc->lock, flags); + + return 0; +} +EXPORT_SYMBOL(set_irq_chip_data); + +/* + * default enable function + */ +static void default_enable(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + + desc->chip->unmask(irq); + desc->status &= ~IRQ_MASKED; +} + +/* + * default disable function + */ +static void default_disable(unsigned int irq) +{ +} + +/* + * default startup function + */ +static unsigned int default_startup(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + + desc->chip->enable(irq); + return 0; +} + +/* + * default shutdown function + */ +static void default_shutdown(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + + desc->chip->mask(irq); + desc->status |= IRQ_MASKED; +} + +/* + * Fixup enable/disable function pointers + */ +void irq_chip_set_defaults(struct irq_chip *chip) +{ + if (!chip->enable) + chip->enable = default_enable; + if (!chip->disable) + chip->disable = default_disable; + if (!chip->startup) + chip->startup = default_startup; + /* + * We use chip->disable, when the user provided its own. When + * we have default_disable set for chip->disable, then we need + * to use default_shutdown, otherwise the irq line is not + * disabled on free_irq(): + */ + if (!chip->shutdown) + chip->shutdown = chip->disable != default_disable ? + chip->disable : default_shutdown; + if (!chip->name) + chip->name = chip->typename; + if (!chip->end) + chip->end = dummy_irq_chip.end; +} + +static inline void mask_ack_irq(struct irq_desc *desc, int irq) +{ + if (desc->chip->mask_ack) + desc->chip->mask_ack(irq); + else { + desc->chip->mask(irq); + desc->chip->ack(irq); + } +} + +/** + * handle_simple_irq - Simple and software-decoded IRQs. + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * + * Simple interrupts are either sent from a demultiplexing interrupt + * handler or come from hardware, where no interrupt hardware control + * is necessary. + * + * Note: The caller is expected to handle the ack, clear, mask and + * unmask issues if necessary. + */ +void +handle_simple_irq(unsigned int irq, struct irq_desc *desc) +{ + struct irqaction *action; + irqreturn_t action_ret; + + spin_lock(&desc->lock); + + if (unlikely(desc->status & IRQ_INPROGRESS)) + goto out_unlock; + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + kstat_incr_irqs_this_cpu(irq, desc); + + action = desc->action; + if (unlikely(!action || (desc->status & IRQ_DISABLED))) + goto out_unlock; + + desc->status |= IRQ_INPROGRESS; + spin_unlock(&desc->lock); + + action_ret = handle_IRQ_event(irq, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + + spin_lock(&desc->lock); + desc->status &= ~IRQ_INPROGRESS; +out_unlock: + spin_unlock(&desc->lock); +} + +/** + * handle_level_irq - Level type irq handler + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * + * Level type interrupts are active as long as the hardware line has + * the active level. This may require to mask the interrupt and unmask + * it after the associated handler has acknowledged the device, so the + * interrupt line is back to inactive. + */ +void +handle_level_irq(unsigned int irq, struct irq_desc *desc) +{ + struct irqaction *action; + irqreturn_t action_ret; + + spin_lock(&desc->lock); + mask_ack_irq(desc, irq); + + if (unlikely(desc->status & IRQ_INPROGRESS)) + goto out_unlock; + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + kstat_incr_irqs_this_cpu(irq, desc); + + /* + * If its disabled or no action available + * keep it masked and get out of here + */ + action = desc->action; + if (unlikely(!action || (desc->status & IRQ_DISABLED))) + goto out_unlock; + + desc->status |= IRQ_INPROGRESS; + spin_unlock(&desc->lock); + + action_ret = handle_IRQ_event(irq, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + + spin_lock(&desc->lock); + desc->status &= ~IRQ_INPROGRESS; + if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask) + desc->chip->unmask(irq); +out_unlock: + spin_unlock(&desc->lock); +} + +/** + * handle_fasteoi_irq - irq handler for transparent controllers + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * + * Only a single callback will be issued to the chip: an ->eoi() + * call when the interrupt has been serviced. This enables support + * for modern forms of interrupt handlers, which handle the flow + * details in hardware, transparently. + */ +void +handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) +{ + struct irqaction *action; + irqreturn_t action_ret; + + spin_lock(&desc->lock); + + if (unlikely(desc->status & IRQ_INPROGRESS)) + goto out; + + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + kstat_incr_irqs_this_cpu(irq, desc); + + /* + * If its disabled or no action available + * then mask it and get out of here: + */ + action = desc->action; + if (unlikely(!action || (desc->status & IRQ_DISABLED))) { + desc->status |= IRQ_PENDING; + if (desc->chip->mask) + desc->chip->mask(irq); + goto out; + } + + desc->status |= IRQ_INPROGRESS; + desc->status &= ~IRQ_PENDING; + spin_unlock(&desc->lock); + + action_ret = handle_IRQ_event(irq, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + + spin_lock(&desc->lock); + desc->status &= ~IRQ_INPROGRESS; +out: + desc->chip->eoi(irq); + + spin_unlock(&desc->lock); +} + +/** + * handle_edge_irq - edge type IRQ handler + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * + * Interrupt occures on the falling and/or rising edge of a hardware + * signal. The occurence is latched into the irq controller hardware + * and must be acked in order to be reenabled. After the ack another + * interrupt can happen on the same source even before the first one + * is handled by the assosiacted event handler. If this happens it + * might be necessary to disable (mask) the interrupt depending on the + * controller hardware. This requires to reenable the interrupt inside + * of the loop which handles the interrupts which have arrived while + * the handler was running. If all pending interrupts are handled, the + * loop is left. + */ +void +handle_edge_irq(unsigned int irq, struct irq_desc *desc) +{ + spin_lock(&desc->lock); + + desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); + + /* + * If we're currently running this IRQ, or its disabled, + * we shouldn't process the IRQ. Mark it pending, handle + * the necessary masking and go out + */ + if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) || + !desc->action)) { + desc->status |= (IRQ_PENDING | IRQ_MASKED); + mask_ack_irq(desc, irq); + goto out_unlock; + } + kstat_incr_irqs_this_cpu(irq, desc); + + /* Start handling the irq */ + desc->chip->ack(irq); + + /* Mark the IRQ currently in progress.*/ + desc->status |= IRQ_INPROGRESS; + + do { + struct irqaction *action = desc->action; + irqreturn_t action_ret; + + if (unlikely(!action)) { + desc->chip->mask(irq); + goto out_unlock; + } + + /* + * When another irq arrived while we were handling + * one, we could have masked the irq. + * Renable it, if it was not disabled in meantime. + */ + if (unlikely((desc->status & + (IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) == + (IRQ_PENDING | IRQ_MASKED))) { + desc->chip->unmask(irq); + desc->status &= ~IRQ_MASKED; + } + + desc->status &= ~IRQ_PENDING; + spin_unlock(&desc->lock); + action_ret = handle_IRQ_event(irq, action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + spin_lock(&desc->lock); + + } while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING); + + desc->status &= ~IRQ_INPROGRESS; +out_unlock: + spin_unlock(&desc->lock); +} + +/** + * handle_percpu_IRQ - Per CPU local irq handler + * @irq: the interrupt number + * @desc: the interrupt description structure for this irq + * + * Per CPU interrupts on SMP machines without locking requirements + */ +void +handle_percpu_irq(unsigned int irq, struct irq_desc *desc) +{ + irqreturn_t action_ret; + + kstat_incr_irqs_this_cpu(irq, desc); + + if (desc->chip->ack) + desc->chip->ack(irq); + + action_ret = handle_IRQ_event(irq, desc->action); + if (!noirqdebug) + note_interrupt(irq, desc, action_ret); + + if (desc->chip->eoi) + desc->chip->eoi(irq); +} + +void +__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, + const char *name) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + printk(KERN_ERR + "Trying to install type control for IRQ%d\n", irq); + return; + } + + if (!handle) + handle = handle_bad_irq; + else if (desc->chip == &no_irq_chip) { + printk(KERN_WARNING "Trying to install %sinterrupt handler " + "for IRQ%d\n", is_chained ? "chained " : "", irq); + /* + * Some ARM implementations install a handler for really dumb + * interrupt hardware without setting an irq_chip. This worked + * with the ARM no_irq_chip but the check in setup_irq would + * prevent us to setup the interrupt at all. Switch it to + * dummy_irq_chip for easy transition. + */ + desc->chip = &dummy_irq_chip; + } + + spin_lock_irqsave(&desc->lock, flags); + + /* Uninstall? */ + if (handle == handle_bad_irq) { + if (desc->chip != &no_irq_chip) + mask_ack_irq(desc, irq); + desc->status |= IRQ_DISABLED; + desc->depth = 1; + } + desc->handle_irq = handle; + desc->name = name; + + if (handle != handle_bad_irq && is_chained) { + desc->status &= ~IRQ_DISABLED; + desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE; + desc->depth = 0; + desc->chip->startup(irq); + } + spin_unlock_irqrestore(&desc->lock, flags); +} + +void +set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, + irq_flow_handler_t handle) +{ + set_irq_chip(irq, chip); + __set_irq_handler(irq, handle, 0, NULL); +} + +void +set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, + irq_flow_handler_t handle, const char *name) +{ + set_irq_chip(irq, chip); + __set_irq_handler(irq, handle, 0, name); +} + +void __init set_irq_noprobe(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq); + return; + } + + spin_lock_irqsave(&desc->lock, flags); + desc->status |= IRQ_NOPROBE; + spin_unlock_irqrestore(&desc->lock, flags); +} + +void __init set_irq_probe(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + unsigned long flags; + + if (!desc) { + printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq); + return; + } + + spin_lock_irqsave(&desc->lock, flags); + desc->status &= ~IRQ_NOPROBE; + spin_unlock_irqrestore(&desc->lock, flags); +} |
