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Date: Tue, 28 Dec 2010 15:59:49 +0200
From: Felipe Balbi <balbi@...com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Cc: Tony Lindgren <tony@...mide.com>,
David Brownell <david-b@...bell.net>,
Thomas Gleixner <tglx@...utronix.de>,
Felipe Balbi <balbi@...com>
Subject: [RFC/PATCH 1/2] mfd: twl6030-irq: move to threaded_irq
... and while at that, also start using
handle_nested_irq() as we should.
Signed-off-by: Felipe Balbi <balbi@...com>
---
drivers/mfd/twl6030-irq.c | 141 ++++++++++++++++-----------------------------
1 files changed, 49 insertions(+), 92 deletions(-)
diff --git a/drivers/mfd/twl6030-irq.c b/drivers/mfd/twl6030-irq.c
index aaedb11..1530411 100644
--- a/drivers/mfd/twl6030-irq.c
+++ b/drivers/mfd/twl6030-irq.c
@@ -84,99 +84,64 @@ static int twl6030_interrupt_mapping[24] = {
static unsigned twl6030_irq_base;
-static struct completion irq_event;
-
/*
* This thread processes interrupts reported by the Primary Interrupt Handler.
*/
-static int twl6030_irq_thread(void *data)
+static irqreturn_t twl6030_irq_thread(int irq, void *unused)
{
- long irq = (long)data;
- static unsigned i2c_errors;
- static const unsigned max_i2c_errors = 100;
int ret;
-
- current->flags |= PF_NOFREEZE;
-
- while (!kthread_should_stop()) {
- int i;
- union {
+ int i;
+ union {
u8 bytes[4];
u32 int_sts;
- } sts;
-
- /* Wait for IRQ, then read PIH irq status (also blocking) */
- wait_for_completion_interruptible(&irq_event);
-
- /* read INT_STS_A, B and C in one shot using a burst read */
- ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes,
- REG_INT_STS_A, 3);
- if (ret) {
- pr_warning("twl6030: I2C error %d reading PIH ISR\n",
- ret);
- if (++i2c_errors >= max_i2c_errors) {
- printk(KERN_ERR "Maximum I2C error count"
- " exceeded. Terminating %s.\n",
- __func__);
- break;
- }
- complete(&irq_event);
- continue;
- }
-
+ } sts;
+ disable_irq_nosync(irq);
- sts.bytes[3] = 0; /* Only 24 bits are valid*/
+ /* read INT_STS_A, B and C in one shot using a burst read */
+ ret = twl_i2c_read(TWL_MODULE_PIH, sts.bytes,
+ REG_INT_STS_A, 3);
+ if (ret) {
+ pr_warning("twl6030: I2C error %d reading PIH ISR\n",
+ ret);
+ return IRQ_NONE;
+ }
- for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++) {
- local_irq_disable();
- if (sts.int_sts & 0x1) {
- int module_irq = twl6030_irq_base +
- twl6030_interrupt_mapping[i];
- struct irq_desc *d = irq_to_desc(module_irq);
- if (!d) {
- pr_err("twl6030: Invalid SIH IRQ: %d\n",
- module_irq);
- return -EINVAL;
- }
+ sts.bytes[3] = 0; /* Only 24 bits are valid*/
- /* These can't be masked ... always warn
- * if we get any surprises.
- */
- if (d->status & IRQ_DISABLED)
- note_interrupt(module_irq, d,
- IRQ_NONE);
- else
- d->handle_irq(module_irq, d);
+ for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++) {
+ local_irq_disable();
+ if (sts.int_sts & 0x1) {
+ int module_irq = twl6030_irq_base +
+ twl6030_interrupt_mapping[i];
+ struct irq_desc *d = irq_to_desc(module_irq);
+ if (!d) {
+ pr_err("twl6030: Invalid SIH IRQ: %d\n",
+ module_irq);
+ return IRQ_NONE;
}
- local_irq_enable();
- }
- ret = twl_i2c_write(TWL_MODULE_PIH, sts.bytes,
- REG_INT_STS_A, 3); /* clear INT_STS_A */
- if (ret)
- pr_warning("twl6030: I2C error in clearing PIH ISR\n");
- enable_irq(irq);
+ /* These can't be masked ... always warn
+ * if we get any surprises.
+ */
+ if (d->status & IRQ_DISABLED)
+ note_interrupt(module_irq, d,
+ IRQ_NONE);
+ else
+ handle_nested_irq(module_irq);
+
+ }
+ local_irq_enable();
}
+ ret = twl_i2c_write(TWL_MODULE_PIH, sts.bytes,
+ REG_INT_STS_A, 3); /* clear INT_STS_A */
+ if (ret)
+ pr_warning("twl6030: I2C error in clearing PIH ISR\n");
- return 0;
-}
+ enable_irq(irq);
-/*
- * handle_twl6030_int() is the desc->handle method for the twl6030 interrupt.
- * This is a chained interrupt, so there is no desc->action method for it.
- * Now we need to query the interrupt controller in the twl6030 to determine
- * which module is generating the interrupt request. However, we can't do i2c
- * transactions in interrupt context, so we must defer that work to a kernel
- * thread. All we do here is acknowledge and mask the interrupt and wakeup
- * the kernel thread.
- */
-static irqreturn_t handle_twl6030_pih(int irq, void *devid)
-{
- disable_irq_nosync(irq);
- complete(devid);
return IRQ_HANDLED;
}
@@ -303,7 +268,6 @@ int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
int status = 0;
int i;
- struct task_struct *task;
int ret;
u8 mask[4];
@@ -337,28 +301,21 @@ int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
pr_info("twl6030: %s (irq %d) chaining IRQs %d..%d\n", "PIH",
irq_num, irq_base, twl6030_irq_next - 1);
- /* install an irq handler to demultiplex the TWL6030 interrupt */
- init_completion(&irq_event);
- task = kthread_run(twl6030_irq_thread, (void *)irq_num, "twl6030-irq");
- if (IS_ERR(task)) {
- pr_err("twl6030: could not create irq %d thread!\n", irq_num);
- status = PTR_ERR(task);
- goto fail_kthread;
- }
-
- status = request_irq(irq_num, handle_twl6030_pih, IRQF_DISABLED,
- "TWL6030-PIH", &irq_event);
+ status = request_threaded_irq(irq_num, NULL, twl6030_irq_thread,
+ IRQF_DISABLED, "TWL6030-PIH", NULL);
if (status < 0) {
pr_err("twl6030: could not claim irq%d: %d\n", irq_num, status);
- goto fail_irq;
+ goto fail;
}
- return status;
-fail_irq:
- free_irq(irq_num, &irq_event);
-fail_kthread:
+ return 0;
+
+fail:
+ free_irq(irq_num, NULL);
+
for (i = irq_base; i < irq_end; i++)
set_irq_chip_and_handler(i, NULL, NULL);
+
return status;
}
--
1.7.3.4.598.g85356
--
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