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authorRoger Quadros <ext-roger.quadros@nokia.com>2009-08-05 15:53:24 +0200
committerTony Lindgren <tony@atomide.com>2009-08-05 15:53:24 +0200
commitb37c45b8c27c049dc44673e40fd63820fd9a9d91 (patch)
treefe3a31bc5e61e7c9d13d64c1c3ec0c7eea9bb5d7 /arch/arm/plat-omap/gpio.c
parentLinux 2.6.31-rc5 (diff)
downloadlinux-b37c45b8c27c049dc44673e40fd63820fd9a9d91.tar.xz
linux-b37c45b8c27c049dc44673e40fd63820fd9a9d91.zip
OMAP: GPIO: Fix incorrect gpio_get logic for output GPIOs
gpio_get() should return DATAIN register value when the GPIO is configured as input whereas it should return DATAOUT register value when the GPIO is configured as output. Now /sys/kernel/debug/gpio shows proper values for output GPIOs Signed-off-by: Roger Quadros <ext-roger.quadros@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/plat-omap/gpio.c')
-rw-r--r--arch/arm/plat-omap/gpio.c121
1 files changed, 89 insertions, 32 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index 26b387c12423..9c16ca8d293c 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -476,14 +476,12 @@ static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable)
__raw_writel(l, reg);
}
-static int __omap_get_gpio_datain(int gpio)
+static int _get_gpio_datain(struct gpio_bank *bank, int gpio)
{
- struct gpio_bank *bank;
void __iomem *reg;
if (check_gpio(gpio) < 0)
return -EINVAL;
- bank = get_gpio_bank(gpio);
reg = bank->base;
switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
@@ -524,6 +522,53 @@ static int __omap_get_gpio_datain(int gpio)
& (1 << get_gpio_index(gpio))) != 0;
}
+static int _get_gpio_dataout(struct gpio_bank *bank, int gpio)
+{
+ void __iomem *reg;
+
+ if (check_gpio(gpio) < 0)
+ return -EINVAL;
+ reg = bank->base;
+
+ switch (bank->method) {
+#ifdef CONFIG_ARCH_OMAP1
+ case METHOD_MPUIO:
+ reg += OMAP_MPUIO_OUTPUT;
+ break;
+#endif
+#ifdef CONFIG_ARCH_OMAP15XX
+ case METHOD_GPIO_1510:
+ reg += OMAP1510_GPIO_DATA_OUTPUT;
+ break;
+#endif
+#ifdef CONFIG_ARCH_OMAP16XX
+ case METHOD_GPIO_1610:
+ reg += OMAP1610_GPIO_DATAOUT;
+ break;
+#endif
+#ifdef CONFIG_ARCH_OMAP730
+ case METHOD_GPIO_730:
+ reg += OMAP730_GPIO_DATA_OUTPUT;
+ break;
+#endif
+#ifdef CONFIG_ARCH_OMAP850
+ case METHOD_GPIO_850:
+ reg += OMAP850_GPIO_DATA_OUTPUT;
+ break;
+#endif
+#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX) || \
+ defined(CONFIG_ARCH_OMAP4)
+ case METHOD_GPIO_24XX:
+ reg += OMAP24XX_GPIO_DATAOUT;
+ break;
+#endif
+ default:
+ return -EINVAL;
+ }
+
+ return (__raw_readl(reg) & (1 << get_gpio_index(gpio))) != 0;
+}
+
#define MOD_REG_BIT(reg, bit_mask, set) \
do { \
int l = __raw_readl(base + reg); \
@@ -1350,9 +1395,49 @@ static int gpio_input(struct gpio_chip *chip, unsigned offset)
return 0;
}
+static int gpio_is_input(struct gpio_bank *bank, int mask)
+{
+ void __iomem *reg = bank->base;
+
+ switch (bank->method) {
+ case METHOD_MPUIO:
+ reg += OMAP_MPUIO_IO_CNTL;
+ break;
+ case METHOD_GPIO_1510:
+ reg += OMAP1510_GPIO_DIR_CONTROL;
+ break;
+ case METHOD_GPIO_1610:
+ reg += OMAP1610_GPIO_DIRECTION;
+ break;
+ case METHOD_GPIO_730:
+ reg += OMAP730_GPIO_DIR_CONTROL;
+ break;
+ case METHOD_GPIO_850:
+ reg += OMAP850_GPIO_DIR_CONTROL;
+ break;
+ case METHOD_GPIO_24XX:
+ reg += OMAP24XX_GPIO_OE;
+ break;
+ }
+ return __raw_readl(reg) & mask;
+}
+
static int gpio_get(struct gpio_chip *chip, unsigned offset)
{
- return __omap_get_gpio_datain(chip->base + offset);
+ struct gpio_bank *bank;
+ void __iomem *reg;
+ int gpio;
+ u32 mask;
+
+ gpio = chip->base + offset;
+ bank = get_gpio_bank(gpio);
+ reg = bank->base;
+ mask = 1 << get_gpio_index(gpio);
+
+ if (gpio_is_input(bank, mask))
+ return _get_gpio_datain(bank, gpio);
+ else
+ return _get_gpio_dataout(bank, gpio);
}
static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
@@ -1886,34 +1971,6 @@ arch_initcall(omap_gpio_sysinit);
#include <linux/debugfs.h>
#include <linux/seq_file.h>
-static int gpio_is_input(struct gpio_bank *bank, int mask)
-{
- void __iomem *reg = bank->base;
-
- switch (bank->method) {
- case METHOD_MPUIO:
- reg += OMAP_MPUIO_IO_CNTL;
- break;
- case METHOD_GPIO_1510:
- reg += OMAP1510_GPIO_DIR_CONTROL;
- break;
- case METHOD_GPIO_1610:
- reg += OMAP1610_GPIO_DIRECTION;
- break;
- case METHOD_GPIO_730:
- reg += OMAP730_GPIO_DIR_CONTROL;
- break;
- case METHOD_GPIO_850:
- reg += OMAP850_GPIO_DIR_CONTROL;
- break;
- case METHOD_GPIO_24XX:
- reg += OMAP24XX_GPIO_OE;
- break;
- }
- return __raw_readl(reg) & mask;
-}
-
-
static int dbg_gpio_show(struct seq_file *s, void *unused)
{
unsigned i, j, gpio;