[U-Boot] [PATCH 1/2] gpio: Add GPIO driver framework for Marvell SoCs

[Ajay Bhargav]

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

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

Signed-off-by: Ajay Bhargav <ajay.bhargav at einfochips.com>
---
 drivers/gpio/Makefile |    1 +
 drivers/gpio/mvgpio.c |  125 +++++++++++++++++++++++++++++++++++++++++++++++++
 include/mvgpio.h      |   52 ++++++++++++++++++++
 3 files changed, 178 insertions(+), 0 deletions(-)
 create mode 100644 drivers/gpio/mvgpio.c
 create mode 100644 include/mvgpio.h

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 62ec97d..c6f652f 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -28,6 +28,7 @@ LIB 	:= $(obj)libgpio.o
 COBJS-$(CONFIG_AT91_GPIO)	+= at91_gpio.o
 COBJS-$(CONFIG_KIRKWOOD_GPIO)	+= kw_gpio.o
 COBJS-$(CONFIG_MARVELL_MFP)	+= mvmfp.o
+COBJS-$(CONFIG_MV_GPIO)		+= mvgpio.o
 COBJS-$(CONFIG_MXC_GPIO)	+= mxc_gpio.o
 COBJS-$(CONFIG_PCA953X)		+= pca953x.o
 COBJS-$(CONFIG_S5P)		+= s5p_gpio.o
diff --git a/drivers/gpio/mvgpio.c b/drivers/gpio/mvgpio.c
new file mode 100644
index 0000000..d64f0db
--- /dev/null
+++ b/drivers/gpio/mvgpio.c
@@ -0,0 +1,125 @@
+/*
+ * (C) Copyright 2011
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav at 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 <asm/gpio.h>
+
+char gpio_names[MV_MAX_GPIO][GPIO_LABEL_MAX];
+
+static int get_gpio_base(int bank)
+{
+	switch (bank) {
+	case 0:
+		return GPIO_BANK0_BASE;
+	case 1:
+		return GPIO_BANK1_BASE;
+	case 2:
+		return GPIO_BANK2_BASE;
+	case 3:
+		return GPIO_BANK3_BASE;
+	}
+	return 0;
+}
+
+int gpio_request(int gp, const char *label)
+{
+	if (gp >= MV_MAX_GPIO)
+		return -EINVAL;
+
+	if (strlen(gpio_names[gp]) == 0) {
+		strncpy(gpio_names[gp], label, GPIO_LABEL_MAX);
+		gpio_names[gp][GPIO_LABEL_MAX - 1] = '\0';
+	} else {
+		return -EBUSY;
+	}
+	return 0;
+}
+
+void gpio_free(int gp)
+{
+	gpio_names[gp][0] = '\0';
+}
+
+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)
+		return -EINVAL;
+
+	gpio_reg_bank = (struct gpio_reg *) 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)
+		return -EINVAL;
+
+	gpio_reg_bank = (struct gpio_reg *) 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)
+		return -EINVAL;
+
+	gpio_reg_bank = (struct gpio_reg *) 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)
+		return;
+
+	gpio_reg_bank = (struct gpio_reg *) 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);
+}
diff --git a/include/mvgpio.h b/include/mvgpio.h
new file mode 100644
index 0000000..7d0258f
--- /dev/null
+++ b/include/mvgpio.h
@@ -0,0 +1,52 @@
+/*
+ * (C) Copyright 2011
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav at 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 _MV_GPIO_H
+#define _MV_GPIO_H
+
+#include <asm/types.h>
+
+#if defined(CONFIG_MV_GPIO)
+
+#define MV_GPIO_BASE		0xD4019000
+#define GPIO_BANK0_BASE		(MV_GPIO_BASE + 0x0000)
+#define GPIO_BANK1_BASE		(MV_GPIO_BASE + 0x0004)
+#define GPIO_BANK2_BASE		(MV_GPIO_BASE + 0x0008)
+#define GPIO_BANK3_BASE		(MV_GPIO_BASE + 0x0100)
+
+#define GPIO_LABEL_MAX		20
+#define MV_MAX_GPIO		128
+
+#define GPIO_TO_REG(gp)		(gp >> 5)
+#define GPIO_TO_BIT(gp)		(1 << (gp & 0x1F))
+#define GPIO_VAL(gp, val)	((val >> (gp & 0x1F)) & 0x01)
+
+#define GPIO_SET		1
+#define GPIO_CLR		0
+
+#endif /* CONFIG_MV_GPIO */
+#endif /* _MV_GPIO_H */
-- 
1.7.0.4