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| author | Thomas Gleixner <tglx@linutronix.de> | 2006-07-01 22:30:08 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-07-01 22:30:08 +0100 |
| commit | f8b5473fcbddbfde827ecf82aa0e81fa2a878220 (patch) | |
| tree | 0d6d504f95830610cb2c2fb1e6e9e1ebf932762b | |
| parent | a2166abd06e7a9fd34eb18b7b27da18c6146e6ef (diff) | |
| download | linux-f8b5473fcbddbfde827ecf82aa0e81fa2a878220.tar.gz linux-f8b5473fcbddbfde827ecf82aa0e81fa2a878220.tar.bz2 linux-f8b5473fcbddbfde827ecf82aa0e81fa2a878220.zip | |
[ARM] 3690/1: genirq: Introduce and make use of dummy irq chip
Patch from Thomas Gleixner
From: Thomas Gleixner <tglx@linutronix.de>
ARM has a couple of really dumb interrupt controllers.
Implement a generic one and fixup the ARM migration. ARM reused
the no_irq_chip for this purpose, but this does not work out
for platforms which are not converted to the new interrupt
type handling model.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | include/linux/irq.h | 3 | ||||
| -rw-r--r-- | kernel/irq/chip.c | 15 | ||||
| -rw-r--r-- | kernel/irq/handle.c | 16 |
3 files changed, 30 insertions, 4 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 0832149cdb18..00b6ef8b2f93 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -348,8 +348,9 @@ extern int noirqdebug_setup(char *str); /* Checks whether the interrupt can be requested by request_irq(): */ extern int can_request_irq(unsigned int irq, unsigned long irqflags); -/* Dummy irq-chip implementation: */ +/* Dummy irq-chip implementations: */ extern struct irq_chip no_irq_chip; +extern struct irq_chip dummy_irq_chip; extern void set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 4a0952d9458b..54105bdfe20d 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -462,9 +462,18 @@ __set_irq_handler(unsigned int irq, if (!handle) handle = handle_bad_irq; - if (is_chained && desc->chip == &no_irq_chip) - printk(KERN_WARNING "Trying to install " - "chained interrupt type for IRQ%d\n", irq); + 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); diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 961b87591731..e71266c3803e 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -96,6 +96,22 @@ struct irq_chip no_irq_chip = { }; /* + * Generic dummy implementation which can be used for + * real dumb interrupt sources + */ +struct irq_chip dummy_irq_chip = { + .name = "dummy", + .startup = noop_ret, + .shutdown = noop, + .enable = noop, + .disable = noop, + .ack = noop, + .mask = noop, + .unmask = noop, + .end = noop, +}; + +/* * Special, empty irq handler: */ irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) |