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Date: Tue, 9 Aug 2011 11:04:13 -0700
From: H Hartley Sweeten <hartleys@...ionengravers.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
CC: <rmallon@...il.com>, <grant.likely@...retlab.ca>
Subject: gpio-ep93xx: Add helper function to convert irq to gpio, port, and mask.
This consolidates the irq_to_gpio() call and the shift magic used to convert
a GPIO irq into it's relevant GPIO, port, and mask values.
Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Ryan Mallon <rmallon@...il.com>
Cc: Grant Likely <grant.likely@...retlab.ca>
---
diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
index 468b27d..788c7c4 100644
--- a/drivers/gpio/gpio-ep93xx.c
+++ b/drivers/gpio/gpio-ep93xx.c
@@ -46,6 +46,20 @@ static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 };
static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x58 };
static const u8 int_debounce_register_offset[3] = { 0xa8, 0xc4, 0x64 };
+/*
+ * Map a sw irq to it's GPIO port and mask.
+ */
+static int ep93xx_gpio_irq_to_gpio_port_mask(unsigned int irq,
+ int *port, int *port_mask)
+{
+ int gpio = irq_to_gpio(irq);
+
+ *port = gpio >> 3;
+ *port_mask = 1 << (gpio & 7);
+
+ return gpio;
+}
+
static void ep93xx_gpio_update_int_params(unsigned port)
{
BUG_ON(port > 2);
@@ -69,9 +83,9 @@ static inline void ep93xx_gpio_int_mask(unsigned line)
static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable)
{
- int line = irq_to_gpio(irq);
- int port = line >> 3;
- int port_mask = 1 << (line & 7);
+ int port, port_mask;
+
+ ep93xx_gpio_irq_to_gpio_port_mask(irq, &port, &port_mask);
if (enable)
gpio_int_debounce[port] |= port_mask;
@@ -119,9 +133,9 @@ static void ep93xx_gpio_f_irq_handler(unsigned int irq, struct irq_desc *desc)
static void ep93xx_gpio_irq_ack(struct irq_data *d)
{
- int line = irq_to_gpio(d->irq);
- int port = line >> 3;
- int port_mask = 1 << (line & 7);
+ int port, port_mask;
+
+ ep93xx_gpio_irq_to_gpio_port_mask(d->irq, &port, &port_mask);
if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
gpio_int_type2[port] ^= port_mask; /* switch edge direction */
@@ -133,9 +147,9 @@ static void ep93xx_gpio_irq_ack(struct irq_data *d)
static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
{
- int line = irq_to_gpio(d->irq);
- int port = line >> 3;
- int port_mask = 1 << (line & 7);
+ int port, port_mask;
+
+ ep93xx_gpio_irq_to_gpio_port_mask(d->irq, &port, &port_mask);
if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH)
gpio_int_type2[port] ^= port_mask; /* switch edge direction */
@@ -148,19 +162,21 @@ static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
static void ep93xx_gpio_irq_mask(struct irq_data *d)
{
- int line = irq_to_gpio(d->irq);
- int port = line >> 3;
+ int port, port_mask;
+
+ ep93xx_gpio_irq_to_gpio_port_mask(d->irq, &port, &port_mask);
- gpio_int_unmasked[port] &= ~(1 << (line & 7));
+ gpio_int_unmasked[port] &= ~port_mask;
ep93xx_gpio_update_int_params(port);
}
static void ep93xx_gpio_irq_unmask(struct irq_data *d)
{
- int line = irq_to_gpio(d->irq);
- int port = line >> 3;
+ int port, port_mask;
+
+ ep93xx_gpio_irq_to_gpio_port_mask(d->irq, &port, &port_mask);
- gpio_int_unmasked[port] |= 1 << (line & 7);
+ gpio_int_unmasked[port] |= port_mask;
ep93xx_gpio_update_int_params(port);
}
@@ -171,11 +187,11 @@ static void ep93xx_gpio_irq_unmask(struct irq_data *d)
*/
static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
{
- const int gpio = irq_to_gpio(d->irq);
- const int port = gpio >> 3;
- const int port_mask = 1 << (gpio & 7);
+ int gpio, port, port_mask;
irq_flow_handler_t handler;
+ gpio = ep93xx_gpio_irq_to_gpio_port_mask(d->irq, &port, &port_mask);
+
gpio_direction_input(gpio);
switch (type) {
--
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