i.MX2 family: Add GPIO multiplexing support

This patch adds GPIO multiplexing support for the imx1/mxc2
family of procesors.
Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>

arch/arm/plat-mxc/Makefile

@@ -4,3 +4,5 @@
 
 # Common support
 obj-y := irq.o clock.o gpio.o time.o
+
+obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o

arch/arm/plat-mxc/iomux-mx1-mx2.c

+/*
+ *  arch/arm/mach-mxc/generic.c
+ *
+ *  author: Sascha Hauer
+ *  Created: april 20th, 2004
+ *  Copyright: Synertronixx GmbH
+ *
+ *  Common code for i.MX machines
+ *
+ * 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 <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/gpio.h>
+
+#include <asm/hardware.h>
+#include <asm/mach/map.h>
+#include <asm/arch/iomux-mx1-mx2.h>
+
+void mxc_gpio_mode(int gpio_mode)
+{
+	unsigned int pin = gpio_mode & GPIO_PIN_MASK;
+	unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
+	unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
+	unsigned int tmp;
+
+	/* Pullup enable */
+	tmp = __raw_readl(VA_GPIO_BASE + MXC_PUEN(port));
+	if (gpio_mode & GPIO_PUEN)
+		tmp |= (1 << pin);
+	else
+		tmp &= ~(1 << pin);
+	__raw_writel(tmp, VA_GPIO_BASE + MXC_PUEN(port));
+
+	/* Data direction */
+	tmp = __raw_readl(VA_GPIO_BASE + MXC_DDIR(port));
+	if (gpio_mode & GPIO_OUT)
+		tmp |= 1 << pin;
+	else
+		tmp &= ~(1 << pin);
+	__raw_writel(tmp, VA_GPIO_BASE + MXC_DDIR(port));
+
+	/* Primary / alternate function */
+	tmp = __raw_readl(VA_GPIO_BASE + MXC_GPR(port));
+	if (gpio_mode & GPIO_AF)
+		tmp |= (1 << pin);
+	else
+		tmp &= ~(1 << pin);
+	__raw_writel(tmp, VA_GPIO_BASE + MXC_GPR(port));
+
+	/* use as gpio? */
+	tmp = __raw_readl(VA_GPIO_BASE + MXC_GIUS(port));
+	if (gpio_mode & (GPIO_PF | GPIO_AF))
+		tmp &= ~(1 << pin);
+	else
+		tmp |= (1 << pin);
+	__raw_writel(tmp, VA_GPIO_BASE + MXC_GIUS(port));
+
+	if (pin < 16) {
+		tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR1(port));
+		tmp &= ~(3 << (pin * 2));
+		tmp |= (ocr << (pin * 2));
+		__raw_writel(tmp, VA_GPIO_BASE + MXC_OCR1(port));
+
+		tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA1(port));
+		tmp &= ~(3 << (pin * 2));
+		tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
+		__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA1(port));
+
+		tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB1(port));
+		tmp &= ~(3 << (pin * 2));
+		tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
+		__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB1(port));
+	} else {
+		pin -= 16;
+
+		tmp = __raw_readl(VA_GPIO_BASE + MXC_OCR2(port));
+		tmp &= ~(3 << (pin * 2));
+		tmp |= (ocr << (pin * 2));
+		__raw_writel(tmp, VA_GPIO_BASE + MXC_OCR2(port));
+
+		tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFA2(port));
+		tmp &= ~(3 << (pin * 2));
+		tmp |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
+		__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFA2(port));
+
+		tmp = __raw_readl(VA_GPIO_BASE + MXC_ICONFB2(port));
+		tmp &= ~(3 << (pin * 2));
+		tmp |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
+		__raw_writel(tmp, VA_GPIO_BASE + MXC_ICONFB2(port));
+	}
+}
+EXPORT_SYMBOL(mxc_gpio_mode);
+
+int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
+				int alloc_mode, const char *label)
+{
+	const int *p = pin_list;
+	int i;
+	unsigned gpio;
+	unsigned mode;
+
+	for (i = 0; i < count; i++) {
+		gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
+		mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
+
+		if (gpio >= (GPIO_PORT_MAX + 1) * 32)
+			goto setup_error;
+
+		if (alloc_mode & MXC_GPIO_ALLOC_MODE_RELEASE)
+			gpio_free(gpio);
+		else if (!(alloc_mode & MXC_GPIO_ALLOC_MODE_NO_ALLOC))
+			if (gpio_request(gpio, label)
+			   && !(alloc_mode & MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
+				goto setup_error;
+
+		if (!(alloc_mode & (MXC_GPIO_ALLOC_MODE_ALLOC_ONLY |
+				    MXC_GPIO_ALLOC_MODE_RELEASE)))
+			mxc_gpio_mode(gpio | mode);
+
+		p++;
+	}
+	return 0;
+
+setup_error:
+	if (alloc_mode & (MXC_GPIO_ALLOC_MODE_NO_ALLOC |
+	    MXC_GPIO_ALLOC_MODE_TRY_ALLOC))
+		return -EINVAL;
+
+	while (p != pin_list) {
+		p--;
+		gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
+		gpio_free(gpio);
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
+