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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-10-09 00:30:11 +0200
committerSamuel Ortiz <samuel@sortiz.org>2008-10-19 22:54:11 +0200
commit9297a0e7e033b7f2776610197fcbb9ff563efe32 (patch)
tree669dea049a24ac9fc89d5506745fb386d620590f
parent26b8f5e1e2d1229c186d8e61d26513c43a058c5e (diff)
downloadop-kernel-dev-9297a0e7e033b7f2776610197fcbb9ff563efe32.zip
op-kernel-dev-9297a0e7e033b7f2776610197fcbb9ff563efe32.tar.gz
mfd: twl4030-core irq simplification
Simplify twl4030 IRQ handling by removing a needless custom flow handler. The top level IRQs, from the PIH, are well suited for handle_simple_irq() ... they can't be acked or masked. Switching resolves some issues with how IRQs were dispatched. Notably, abuse of desc->status, IRQ accounting, and handling of various faults. In short, use standard genirq code. Drivers that request_irq() to the PIH will need to pay more attention to things like setting IRQF_DISABLED (since it's no longer ignored), and making I2C calls from handlers (you'll need a lockdep workaround). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
-rw-r--r--drivers/mfd/twl4030-core.c68
1 files changed, 2 insertions, 66 deletions
diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
index 4af1624..fd9a016 100644
--- a/drivers/mfd/twl4030-core.c
+++ b/drivers/mfd/twl4030-core.c
@@ -535,68 +535,6 @@ EXPORT_SYMBOL(twl4030_i2c_read_u8);
/*----------------------------------------------------------------------*/
-/*
- * do_twl4030_module_irq() is the desc->handle method for each of the twl4030
- * module interrupts that doesn't chain to another irq_chip (GPIO, power, etc).
- * It executes in kernel thread context. On entry, cpu interrupts are disabled.
- */
-static void do_twl4030_module_irq(unsigned int irq, irq_desc_t *desc)
-{
- struct irqaction *action;
- const unsigned int cpu = smp_processor_id();
-
- /*
- * Earlier this was desc->triggered = 1;
- */
- desc->status |= IRQ_LEVEL;
-
- /*
- * The desc->handle method would normally call the desc->chip->ack
- * method here, but we won't bother since our ack method is NULL.
- */
-
- if (!desc->depth) {
- kstat_cpu(cpu).irqs[irq]++;
-
- action = desc->action;
- if (action) {
- int ret;
- int status = 0;
- int retval = 0;
-
- local_irq_enable();
-
- do {
- /* Call the ISR with cpu interrupts enabled */
- ret = action->handler(irq, action->dev_id);
- if (ret == IRQ_HANDLED)
- status |= action->flags;
- retval |= ret;
- action = action->next;
- } while (action);
-
- if (status & IRQF_SAMPLE_RANDOM)
- add_interrupt_randomness(irq);
-
- local_irq_disable();
-
- if (retval != IRQ_HANDLED)
- printk(KERN_ERR "ISR for TWL4030 module"
- " irq %d can't handle interrupt\n",
- irq);
-
- /*
- * Here is where we should call the unmask method, but
- * again we won't bother since it is NULL.
- */
- } else
- printk(KERN_CRIT "TWL4030 module irq %d has no ISR"
- " but can't be masked!\n", irq);
- } else
- printk(KERN_CRIT "TWL4030 module irq %d is disabled but can't"
- " be masked!\n", irq);
-}
-
static unsigned twl4030_irq_base;
static struct completion irq_event;
@@ -611,7 +549,6 @@ static int twl4030_irq_thread(void *data)
static unsigned i2c_errors;
const static unsigned max_i2c_errors = 100;
- daemonize("twl4030-irq");
current->flags |= PF_NOFREEZE;
while (!kthread_should_stop()) {
@@ -691,8 +628,7 @@ static struct task_struct * __init start_twl4030_irq_thread(long irq)
struct task_struct *thread;
init_completion(&irq_event);
- thread = kthread_run(twl4030_irq_thread, (void *)irq,
- "twl4030 irq %ld", irq);
+ thread = kthread_run(twl4030_irq_thread, (void *)irq, "twl4030-irq");
if (!thread)
pr_err("%s: could not create twl4030 irq %ld thread!\n",
DRIVER_NAME, irq);
@@ -1126,7 +1062,7 @@ static void twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
/* install an irq handler for each of the PIH modules */
for (i = irq_base; i < irq_end; i++) {
set_irq_chip_and_handler(i, &twl4030_irq_chip,
- do_twl4030_module_irq);
+ handle_simple_irq);
activate_irq(i);
}
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