SAMSUNG: make s5p common gpio functions

[karo-tx-uboot.git] / drivers / gpio / s5p_gpio.c

diff --git a/drivers/gpio/s5p_gpio.c b/drivers/gpio/s5p_gpio.c
new file mode 100644 (file)
index 0000000..0439477
--- /dev/null
+++ b/drivers/gpio/s5p_gpio.c
@@ -0,0 +1,143 @@
+/*
+ * (C) Copyright 2009 Samsung Electronics
+ * Minkyu Kang <mk7.kang@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/gpio.h>
+
+#define CON_MASK(x)            (0xf << ((x) << 2))
+#define CON_SFR(x, v)          ((v) << ((x) << 2))
+
+#define DAT_MASK(x)            (0x1 << (x))
+#define DAT_SET(x)             (0x1 << (x))
+
+#define PULL_MASK(x)           (0x3 << ((x) << 1))
+#define PULL_MODE(x, v)                ((v) << ((x) << 1))
+
+#define DRV_MASK(x)            (0x3 << ((x) << 1))
+#define DRV_SET(x, m)          ((m) << ((x) << 1))
+#define RATE_MASK(x)           (0x1 << (x + 16))
+#define RATE_SET(x)            (0x1 << (x + 16))
+
+void gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg)
+{
+       unsigned int value;
+
+       value = readl(&bank->con);
+       value &= ~CON_MASK(gpio);
+       value |= CON_SFR(gpio, cfg);
+       writel(value, &bank->con);
+}
+
+void gpio_direction_output(struct s5p_gpio_bank *bank, int gpio, int en)
+{
+       unsigned int value;
+
+       gpio_cfg_pin(bank, gpio, GPIO_OUTPUT);
+
+       value = readl(&bank->dat);
+       value &= ~DAT_MASK(gpio);
+       if (en)
+               value |= DAT_SET(gpio);
+       writel(value, &bank->dat);
+}
+
+void gpio_direction_input(struct s5p_gpio_bank *bank, int gpio)
+{
+       gpio_cfg_pin(bank, gpio, GPIO_INPUT);
+}
+
+void gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en)
+{
+       unsigned int value;
+
+       value = readl(&bank->dat);
+       value &= ~DAT_MASK(gpio);
+       if (en)
+               value |= DAT_SET(gpio);
+       writel(value, &bank->dat);
+}
+
+unsigned int gpio_get_value(struct s5p_gpio_bank *bank, int gpio)
+{
+       unsigned int value;
+
+       value = readl(&bank->dat);
+       return !!(value & DAT_MASK(gpio));
+}
+
+void gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode)
+{
+       unsigned int value;
+
+       value = readl(&bank->pull);
+       value &= ~PULL_MASK(gpio);
+
+       switch (mode) {
+       case GPIO_PULL_DOWN:
+       case GPIO_PULL_UP:
+               value |= PULL_MODE(gpio, mode);
+               break;
+       default:
+               return;
+       }
+
+       writel(value, &bank->pull);
+}
+
+void gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode)
+{
+       unsigned int value;
+
+       value = readl(&bank->drv);
+       value &= ~DRV_MASK(gpio);
+
+       switch (mode) {
+       case GPIO_DRV_1X:
+       case GPIO_DRV_2X:
+       case GPIO_DRV_3X:
+       case GPIO_DRV_4X:
+               value |= DRV_SET(gpio, mode);
+               break;
+       default:
+               return;
+       }
+
+       writel(value, &bank->drv);
+}
+
+void gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
+{
+       unsigned int value;
+
+       value = readl(&bank->drv);
+       value &= ~RATE_MASK(gpio);
+
+       switch (mode) {
+       case GPIO_DRV_FAST:
+       case GPIO_DRV_SLOW:
+               value |= RATE_SET(gpio);
+               break;
+       default:
+               return;
+       }
+
+       writel(value, &bank->drv);
+}