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authorThomas Gleixner <tglx@linutronix.de>2006-07-01 21:30:08 (GMT)
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-07-01 21:30:08 (GMT)
commitf8b5473fcbddbfde827ecf82aa0e81fa2a878220 (patch)
tree0d6d504f95830610cb2c2fb1e6e9e1ebf932762b /kernel/irq
parenta2166abd06e7a9fd34eb18b7b27da18c6146e6ef (diff)
downloadlinux-f8b5473fcbddbfde827ecf82aa0e81fa2a878220.tar.xz
[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>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/chip.c15
-rw-r--r--kernel/irq/handle.c16
2 files changed, 28 insertions, 3 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 4a0952d..54105bd 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 961b875..e71266c 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)