summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--cpu/arm926ejs/nomadik/Makefile2
-rw-r--r--cpu/arm926ejs/nomadik/gpio.c99
-rw-r--r--include/asm-arm/arch-nomadik/gpio.h42
3 files changed, 142 insertions, 1 deletions
diff --git a/cpu/arm926ejs/nomadik/Makefile b/cpu/arm926ejs/nomadik/Makefile
index e3bd2ee..0fc9f2a 100644
--- a/cpu/arm926ejs/nomadik/Makefile
+++ b/cpu/arm926ejs/nomadik/Makefile
@@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(SOC).a
-COBJS = timer.o
+COBJS = timer.o gpio.o
SOBJS = reset.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/cpu/arm926ejs/nomadik/gpio.c b/cpu/arm926ejs/nomadik/gpio.c
new file mode 100644
index 0000000..62a375b
--- /dev/null
+++ b/cpu/arm926ejs/nomadik/gpio.c
@@ -0,0 +1,99 @@
+/*
+ * (C) Copyright 2009 Alessandro Rubini
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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>
+
+static unsigned long gpio_base[4] = {
+ NOMADIK_GPIO0_BASE,
+ NOMADIK_GPIO1_BASE,
+ NOMADIK_GPIO2_BASE,
+ NOMADIK_GPIO3_BASE
+};
+
+enum gpio_registers {
+ GPIO_DAT = 0x00, /* data register */
+ GPIO_DATS = 0x04, /* data set */
+ GPIO_DATC = 0x08, /* data clear */
+ GPIO_PDIS = 0x0c, /* pull disable */
+ GPIO_DIR = 0x10, /* direction */
+ GPIO_DIRS = 0x14, /* direction set */
+ GPIO_DIRC = 0x18, /* direction clear */
+ GPIO_AFSLA = 0x20, /* alternate function select A */
+ GPIO_AFSLB = 0x24, /* alternate function select B */
+};
+
+static inline unsigned long gpio_to_base(int gpio)
+{
+ return gpio_base[gpio / 32];
+}
+
+static inline u32 gpio_to_bit(int gpio)
+{
+ return 1 << (gpio & 0x1f);
+}
+
+void nmk_gpio_af(int gpio, int alternate_function)
+{
+ unsigned long base = gpio_to_base(gpio);
+ u32 bit = gpio_to_bit(gpio);
+ u32 afunc, bfunc;
+
+ /* alternate function is 0..3, with one bit per register */
+ afunc = readl(base + GPIO_AFSLA) & ~bit;
+ bfunc = readl(base + GPIO_AFSLB) & ~bit;
+ if (alternate_function & 1) afunc |= bit;
+ if (alternate_function & 2) bfunc |= bit;
+ writel(afunc, base + GPIO_AFSLA);
+ writel(bfunc, base + GPIO_AFSLB);
+}
+
+void nmk_gpio_dir(int gpio, int dir)
+{
+ unsigned long base = gpio_to_base(gpio);
+ u32 bit = gpio_to_bit(gpio);
+
+ if (dir)
+ writel(bit, base + GPIO_DIRS);
+ else
+ writel(bit, base + GPIO_DIRC);
+}
+
+void nmk_gpio_set(int gpio, int val)
+{
+ unsigned long base = gpio_to_base(gpio);
+ u32 bit = gpio_to_bit(gpio);
+
+ if (val)
+ writel(bit, base + GPIO_DATS);
+ else
+ writel(bit, base + GPIO_DATC);
+}
+
+int nmk_gpio_get(int gpio)
+{
+ unsigned long base = gpio_to_base(gpio);
+ u32 bit = gpio_to_bit(gpio);
+
+ return readl(base + GPIO_DAT) & bit;
+}
diff --git a/include/asm-arm/arch-nomadik/gpio.h b/include/asm-arm/arch-nomadik/gpio.h
new file mode 100644
index 0000000..1d3c9ce
--- /dev/null
+++ b/include/asm-arm/arch-nomadik/gpio.h
@@ -0,0 +1,42 @@
+/*
+ * (C) Copyright 2009 Alessandro Rubini
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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
+ */
+#ifndef __NMK_GPIO_H__
+#define __NMK_GPIO_H__
+
+/*
+ * These functions are called from the soft-i2c driver, but
+ * are also used by board files to set output bits.
+ */
+
+enum nmk_af { /* alternate function settings */
+ GPIO_GPIO = 0,
+ GPIO_ALT_A,
+ GPIO_ALT_B,
+ GPIO_ALT_C
+};
+
+extern void nmk_gpio_af(int gpio, int alternate_function);
+extern void nmk_gpio_dir(int gpio, int dir);
+extern void nmk_gpio_set(int gpio, int val);
+extern int nmk_gpio_get(int gpio);
+
+#endif /* __NMK_GPIO_H__ */