[U-Boot] [PATCH 3/3] dm: gpio: Implement open drain for MPC85XX GPIO

Mario Six
2016-04-26T14:08:28Z

Signed-off-by: Mario Six <mario.six@gdsys.cc>
---
drivers/gpio/mpc85xx_gpio.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)

diff --git a/drivers/gpio/mpc85xx_gpio.c b/drivers/gpio/mpc85xx_gpio.c
index 2289eb7..6e920e6 100644
--- a/drivers/gpio/mpc85xx_gpio.c
+++ b/drivers/gpio/mpc85xx_gpio.c
@@ -66,6 +66,25 @@ mpc85xx_gpio_set_high(struct ccsr_gpio *base, unsigned int gpios)
setbits_be32(&base->gpdir, gpios);
}

+static inline int
+mpc85xx_gpio_open_drain_val(struct ccsr_gpio *base, unsigned int mask)
+{
+ /* Read the requested values */
+ return in_be32(&base->gpodr) & mask;
+}
+
+static inline void
+mpc85xx_gpio_open_drain_on(struct ccsr_gpio *base, unsigned int gpios)
+{
+ setbits_be32(&base->gpodr, gpios);
+}
+
+static inline void
+mpc85xx_gpio_open_drain_off(struct ccsr_gpio *base, unsigned int gpios)
+{
+ clrbits_be32(&base->gpodr, gpios);
+}
+
static int mpc85xx_gpio_direction_input(struct udevice *dev, unsigned int gpio)
{
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
@@ -75,6 +94,26 @@ static int mpc85xx_gpio_direction_input(struct udevice *dev, unsigned int gpio)
}

static int
+mpc85xx_gpio_get_open_drain(struct udevice *dev, unsigned gpio)
+{
+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+
+ return !!mpc85xx_gpio_open_drain_val(data->base, 1U << (31 - gpio));
+}
+
+static int
+mpc85xx_gpio_set_open_drain(struct udevice *dev, unsigned gpio, int value)
+{
+ struct mpc85xx_gpio_data *data = dev_get_priv(dev);
+
+ if (value)
+ mpc85xx_gpio_open_drain_on(data->base, 1U << (31 - gpio));
+ else
+ mpc85xx_gpio_open_drain_off(data->base, 1U << (31 - gpio));
+ return 0;
+}
+
+static int
mpc85xx_gpio_set_value(struct udevice *dev, unsigned gpio, int value)
{
struct mpc85xx_gpio_data *data = dev_get_priv(dev);
@@ -163,6 +202,8 @@ static const struct dm_gpio_ops gpio_mpc85xx_ops = {
.direction_output = mpc85xx_gpio_direction_output,
.get_value = mpc85xx_gpio_get_value,
.set_value = mpc85xx_gpio_set_value,
+ .get_open_drain = mpc85xx_gpio_get_open_drain,
+ .set_open_drain = mpc85xx_gpio_set_open_drain,
.get_function = mpc85xx_gpio_get_function,
};

--
2.7.0.GIT