gpio: Add GPIO driver framework for Marvell SoCs

This patch adds generic GPIO driver framework support for Marvell SoCs.

To enable GPIO driver define CONFIG_MARVELL_GPIO and for GPIO commands
define CONFIG_CMD_GPIO in your board configuration file.

Signed-off-by: Ajay Bhargav <ajay.bhargav@einfochips.com>

drivers/gpio/Makefile

@@ -27,6 +27,7 @@ LIB 	:= $(obj)libgpio.o
 
 COBJS-$(CONFIG_AT91_GPIO)	+= at91_gpio.o
 COBJS-$(CONFIG_KIRKWOOD_GPIO)	+= kw_gpio.o
+COBJS-$(CONFIG_MARVELL_GPIO)	+= mvgpio.o
 COBJS-$(CONFIG_MARVELL_MFP)	+= mvmfp.o
 COBJS-$(CONFIG_MXC_GPIO)	+= mxc_gpio.o
 COBJS-$(CONFIG_PCA953X)		+= pca953x.o

drivers/gpio/mvgpio.c

@@ -0,0 +1,115 @@
+/*
+ * (C) Copyright 2011
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
+ *
+ * (C) Copyright 2010
+ * Marvell Semiconductor <www.marvell.com>
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include "mvgpio.h"
+#include <asm/gpio.h>
+
+#ifndef MV_MAX_GPIO
+#define MV_MAX_GPIO	128
+#endif
+
+int gpio_request(int gp, const char *label)
+{
+	if (gp >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO requested %d\n", __func__, gp);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+void gpio_free(int gp)
+{
+}
+
+void gpio_toggle_value(int gp)
+{
+	gpio_set_value(gp, !gpio_get_value(gp));
+}
+
+int gpio_direction_input(int gp)
+{
+	struct gpio_reg *gpio_reg_bank;
+
+	if (gp >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gp);
+		return -EINVAL;
+	}
+
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
+	writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gcdr);
+	return 0;
+}
+
+int gpio_direction_output(int gp, int value)
+{
+	struct gpio_reg *gpio_reg_bank;
+
+	if (gp >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gp);
+		return -EINVAL;
+	}
+
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
+	writel(GPIO_TO_BIT(gp), &gpio_reg_bank->gsdr);
+	gpio_set_value(gp, value);
+	return 0;
+}
+
+int gpio_get_value(int gp)
+{
+	struct gpio_reg *gpio_reg_bank;
+	u32 gp_val;
+
+	if (gp >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gp);
+		return -EINVAL;
+	}
+
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
+	gp_val = readl(&gpio_reg_bank->gplr);
+
+	return GPIO_VAL(gp, gp_val);
+}
+
+void gpio_set_value(int gp, int value)
+{
+	struct gpio_reg *gpio_reg_bank;
+
+	if (gp >= MV_MAX_GPIO) {
+		printf("%s: Invalid GPIO %d\n", __func__, gp);
+		return;
+	}
+
+	gpio_reg_bank = get_gpio_base(GPIO_TO_REG(gp));
+	if (value)
+		writel(GPIO_TO_BIT(gp),	&gpio_reg_bank->gpsr);
+	else
+		writel(GPIO_TO_BIT(gp),	&gpio_reg_bank->gpcr);
+}

drivers/gpio/mvgpio.h

@@ -0,0 +1,74 @@
+/*
+ * (C) Copyright 2011
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
+ *
+ * (C) Copyright 2010
+ * Marvell Semiconductor <www.marvell.com>
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#ifndef __MVGPIO_H__
+#define __MVGPIO_H__
+
+#include <common.h>
+
+#ifdef CONFIG_SHEEVA_88SV331xV5
+/*
+ * GPIO Register map for SHEEVA 88SV331xV5
+ */
+struct gpio_reg {
+	u32 gplr;	/* Pin Level Register - 0x0000 */
+	u32 pad0[2];
+	u32 gpdr;	/* Pin Direction Register - 0x000C */
+	u32 pad1[2];
+	u32 gpsr;	/* Pin Output Set Register - 0x0018 */
+	u32 pad2[2];
+	u32 gpcr;	/* Pin Output Clear Register - 0x0024 */
+	u32 pad3[2];
+	u32 grer;	/* Rising-Edge Detect Enable Register - 0x0030 */
+	u32 pad4[2];
+	u32 gfer;	/* Falling-Edge Detect Enable Register - 0x003C */
+	u32 pad5[2];
+	u32 gedr;	/* Edge Detect Status Register - 0x0048 */
+	u32 pad6[2];
+	u32 gsdr;	/* Bitwise Set of GPIO Direction Register - 0x0054 */
+	u32 pad7[2];
+	u32 gcdr;	/* Bitwise Clear of GPIO Direction Register - 0x0060 */
+	u32 pad8[2];
+	u32 gsrer;	/* Bitwise Set of Rising-Edge Detect Enable
+			   Register - 0x006C */
+	u32 pad9[2];
+	u32 gcrer;	/* Bitwise Clear of Rising-Edge Detect Enable
+			   Register - 0x0078 */
+	u32 pad10[2];
+	u32 gsfer;	/* Bitwise Set of Falling-Edge Detect Enable
+			   Register - 0x0084 */
+	u32 pad11[2];
+	u32 gcfer;	/* Bitwise Clear of Falling-Edge Detect Enable
+			   Register - 0x0090 */
+	u32 pad12[2];
+	u32 apmask;	/* Bitwise Mask of Edge Detect Register - 0x009C */
+};
+#else
+#error "CPU core subversion not defined"
+#endif
+
+#endif /* __MVGPIO_H__ */