i2c:gpio:s5p: I2C GPIO Software implementation (via soft_i2c)

This patch adds support for software I2C for GONI and Universal C210 reference targets.
It adds support for access to GPIOs by number, not as it is present,
by bank and offset.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Cc: Heiko Schocher <hs@denx.de>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/gpio/s5p_gpio.c b/drivers/gpio/s5p_gpio.c
index 2043859..1edf9a2 100644
--- a/drivers/gpio/s5p_gpio.c
+++ b/drivers/gpio/s5p_gpio.c
@@ -141,3 +141,47 @@ void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
 
 	writel(value, &bank->drv);
 }
+
+struct s5p_gpio_bank *s5p_gpio_get_bank(int nr)
+{
+	int bank = nr / GPIO_PER_BANK;
+	bank *= sizeof(struct s5p_gpio_bank);
+
+	return (struct s5p_gpio_bank *) (s5p_gpio_base(nr) + bank);
+}
+
+int s5p_gpio_get_pin(int nr)
+{
+	return nr % GPIO_PER_BANK;
+}
+
+int gpio_request(int gpio, const char *label)
+{
+	return 0;
+}
+
+int gpio_direction_input(int nr)
+{
+	s5p_gpio_direction_input(s5p_gpio_get_bank(nr),
+				s5p_gpio_get_pin(nr));
+	return 0;
+}
+
+int gpio_direction_output(int nr, int value)
+{
+	s5p_gpio_direction_output(s5p_gpio_get_bank(nr),
+				 s5p_gpio_get_pin(nr), value);
+	return 0;
+}
+
+int gpio_get_value(int nr)
+{
+	return (int) s5p_gpio_get_value(s5p_gpio_get_bank(nr),
+				       s5p_gpio_get_pin(nr));
+}
+
+void gpio_set_value(int nr, int value)
+{
+	s5p_gpio_set_value(s5p_gpio_get_bank(nr),
+			  s5p_gpio_get_pin(nr), value);
+}