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path: root/arch/arm/mach-pxa/gpio.c
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Diffstat (limited to 'arch/arm/mach-pxa/gpio.c')
-rw-r--r--arch/arm/mach-pxa/gpio.c59
1 files changed, 49 insertions, 10 deletions
diff --git a/arch/arm/mach-pxa/gpio.c b/arch/arm/mach-pxa/gpio.c
index 14930cf8be7..5fec1e479cb 100644
--- a/arch/arm/mach-pxa/gpio.c
+++ b/arch/arm/mach-pxa/gpio.c
@@ -25,6 +25,18 @@
#include "generic.h"
+#define GPIO0_BASE ((void __iomem *)io_p2v(0x40E00000))
+#define GPIO1_BASE ((void __iomem *)io_p2v(0x40E00004))
+#define GPIO2_BASE ((void __iomem *)io_p2v(0x40E00008))
+#define GPIO3_BASE ((void __iomem *)io_p2v(0x40E00100))
+
+#define GPLR_OFFSET 0x00
+#define GPDR_OFFSET 0x0C
+#define GPSR_OFFSET 0x18
+#define GPCR_OFFSET 0x24
+#define GRER_OFFSET 0x30
+#define GFER_OFFSET 0x3C
+#define GEDR_OFFSET 0x48
struct pxa_gpio_chip {
struct gpio_chip chip;
@@ -33,6 +45,18 @@ struct pxa_gpio_chip {
int pxa_last_gpio;
+#ifdef CONFIG_CPU_PXA26x
+/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
+ * as well as their Alternate Function value being '1' for GPIO in GAFRx.
+ */
+static int __gpio_is_inverted(unsigned gpio)
+{
+ return cpu_is_pxa25x() && gpio > 85;
+}
+#else
+#define __gpio_is_inverted(gpio) (0)
+#endif
+
/*
* Configure pins for GPIO or other functions
*/
@@ -75,7 +99,10 @@ static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
gpdr = pxa->regbase + GPDR_OFFSET;
local_irq_save(flags);
value = __raw_readl(gpdr);
- value &= ~mask;
+ if (__gpio_is_inverted(chip->base + offset))
+ value |= mask;
+ else
+ value &= ~mask;
__raw_writel(value, gpdr);
local_irq_restore(flags);
@@ -97,7 +124,10 @@ static int pxa_gpio_direction_output(struct gpio_chip *chip,
gpdr = pxa->regbase + GPDR_OFFSET;
local_irq_save(flags);
tmp = __raw_readl(gpdr);
- tmp |= mask;
+ if (__gpio_is_inverted(chip->base + offset))
+ tmp &= ~mask;
+ else
+ tmp |= mask;
__raw_writel(tmp, gpdr);
local_irq_restore(flags);
@@ -173,10 +203,17 @@ static unsigned long GPIO_IRQ_mask[4];
*/
static int __gpio_is_occupied(unsigned gpio)
{
- if (cpu_is_pxa25x() || cpu_is_pxa27x())
- return GAFR(gpio) & (0x3 << (((gpio) & 0xf) * 2));
- else
- return 0;
+ if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
+ int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
+ int dir = GPDR(gpio) & GPIO_bit(gpio);
+
+ if (__gpio_is_inverted(gpio))
+ return af != 1 || dir == 0;
+ else
+ return af != 0 || dir != 0;
+ }
+
+ return 0;
}
static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
@@ -190,9 +227,8 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
/* Don't mess with enabled GPIOs using preconfigured edges or
* GPIOs set to alternate function or to output during probe
*/
- if ((GPIO_IRQ_rising_edge[idx] |
- GPIO_IRQ_falling_edge[idx] |
- GPDR(gpio)) & GPIO_bit(gpio))
+ if ((GPIO_IRQ_rising_edge[idx] & GPIO_bit(gpio)) ||
+ (GPIO_IRQ_falling_edge[idx] & GPIO_bit(gpio)))
return 0;
if (__gpio_is_occupied(gpio))
@@ -201,7 +237,10 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
}
- GPDR(gpio) &= ~GPIO_bit(gpio);
+ if (__gpio_is_inverted(gpio))
+ GPDR(gpio) |= GPIO_bit(gpio);
+ else
+ GPDR(gpio) &= ~GPIO_bit(gpio);
if (type & IRQ_TYPE_EDGE_RISING)
__set_bit(gpio, GPIO_IRQ_rising_edge);