arm nomadik: add gpio support

Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stericsson.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

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)

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;
+}

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__ */