Add ADM5120 GPIO wrappers

SVN-Revision: 7288

1 files changed, 714 insertions, 0 deletions

diff --git a/target/linux/adm5120-2.6/files/arch/mips/adm5120/gpio.c b/target/linux/adm5120-2.6/files/arch/mips/adm5120/gpio.c
new file mode 100644
index 0000000..3b317e3
--- /dev/null
+++ b/target/linux/adm5120-2.6/files/arch/mips/adm5120/gpio.c
@@ -0,0 +1,714 @@
+/*
+ *  $Id$
+ *
+ *  ADM5120 GPIO support
+ *
+ *  Copyright (C) 2007 OpenWrt.org
+ *  Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
+ *
+ *  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 <linux/autoconf.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+#include <asm/mach-adm5120/adm5120_defs.h>
+#include <asm/mach-adm5120/adm5120_info.h>
+#include <asm/mach-adm5120/adm5120_switch.h>
+
+typedef void __iomem *	gpio_reg_t;
+#define GPIO_READ(r)	readl((r))
+#define GPIO_WRITE(v,r)	writel((v),(r))
+#define GPIO_REG(r)	(gpio_reg_t)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r)
+
+struct adm5120_gpio_line {
+	u32 flags;
+	const char *label;
+};
+
+#define GPIO_FLAG_VALID		0x01
+#define GPIO_FLAG_USED		0x02
+
+struct led_desc {
+	gpio_reg_t reg;	/* LED register address */
+	u8 iv_shift;	/* shift amount for input bit */
+	u8 mode_shift;	/* shift amount for mode bits */
+};
+
+#define LED_DESC(_port,_led) { \
+		.reg = GPIO_REG(SWITCH_REG_PORT0_LED+_port*4), \
+		.iv_shift = LED0_IV_SHIFT+_led, \
+		.mode_shift = _led*4 \
+	}
+
+static struct led_desc led_table[15] = {
+	LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2),
+	LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2),
+	LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2),
+	LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2),
+	LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2)
+};
+
+static struct adm5120_gpio_line adm5120_gpio_map[ADM5120_GPIO_COUNT] = {
+	[ADM5120_GPIO_PIN0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN3] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN4] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN5] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN6] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN7] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P0L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P0L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P0L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P1L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P1L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P1L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P2L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P2L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P2L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P3L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P3L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P3L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P4L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P4L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P4L2] = {.flags = GPIO_FLAG_VALID}
+};
+
+#define gpio_is_invalid(g) ( \
+		(g) > ADM5120_GPIO_MAX || \
+		((adm5120_gpio_map[(g)].flags & GPIO_FLAG_VALID) == 0) \
+	)
+
+#define gpio_is_used(g)	((adm5120_gpio_map[(g)].flags & GPIO_FLAG_USED) != 0)
+
+/*
+ * Helpers for GPIO lines in GPIO_CONF0 register
+ */
+#define PIN_IM(p)	((1 << GPIO_CONF0_IM_SHIFT) << p)
+#define PIN_IV(p)	((1 << GPIO_CONF0_IV_SHIFT) << p)
+#define PIN_OE(p)	((1 << GPIO_CONF0_OE_SHIFT) << p)
+#define PIN_OV(p)	((1 << GPIO_CONF0_OV_SHIFT) << p)
+
+static inline int pins_direction_input(unsigned pin)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	t &= ~(PIN_OE(pin));
+	t |= PIN_IM(pin);
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int pins_direction_output(unsigned pin, int value)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	t &= ~(PIN_IM(pin) | PIN_OV(pin));
+	t |= PIN_OE(pin);
+
+	if (value)
+		t |= PIN_OV(pin);
+
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int pins_get_value(unsigned pin)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	if ((t & PIN_IM(pin)) != 0)
+		t &= PIN_IV(pin);
+	else
+		t &= PIN_OV(pin);
+
+	return (t) ? 1 : 0;
+}
+
+static inline void pins_set_value(unsigned pin, int value)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	if (value == 0)
+		t &= ~(PIN_OV(pin));
+	else
+		t |= PIN_OV(pin);
+
+	GPIO_WRITE(t,reg);
+}
+
+/*
+ * Helpers for GPIO lines in PORTx_LED registers
+ */
+static inline int leds_direction_input(unsigned led)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = led_table[led].reg;
+	t = GPIO_READ(reg);
+	t &= ~(LED_MODE_MASK << led_table[led].mode_shift);
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int leds_direction_output(unsigned led, int value)
+{
+	gpio_reg_t *reg;
+	u32 t, s;
+
+	reg = led_table[led].reg;
+	s = led_table[led].mode_shift;
+
+	t = GPIO_READ(reg);
+	t &= ~(LED_MODE_MASK << s);
+	if (value)
+		t |= (LED_MODE_OUT_HIGH << s);
+	else
+		t |= (LED_MODE_OUT_LOW << s);
+
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int leds_get_value(unsigned led)
+{
+	gpio_reg_t *reg;
+	u32 t, m;
+
+	reg = led_table[led].reg;
+
+	t = GPIO_READ(reg);
+	m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
+	if (m == LED_MODE_INPUT)
+		return (t >> led_table[led].iv_shift) & 1;
+
+	if (m == LED_MODE_OUT_LOW)
+		return 0;
+
+	return 1;
+}
+
+static inline void leds_set_value(unsigned led, int value)
+{
+	gpio_reg_t *reg;
+	u32 s,t;
+
+	reg = led_table[led].reg;
+	s = led_table[led].mode_shift;
+
+	t = GPIO_READ(reg);
+	t &= ~(LED_MODE_MASK << s);
+	if (value)
+		t |= (LED_MODE_OUT_HIGH << s);
+	else
+		t |= (LED_MODE_OUT_LOW << s);
+
+	GPIO_WRITE(t,reg);
+}
+
+/*
+ * Main GPIO support routines
+ */
+int adm5120_gpio_direction_input(unsigned gpio)
+{
+	if (gpio_is_invalid(gpio))
+		return -EINVAL;
+
+	if (gpio < ADM5120_GPIO_P0L0)
+		return pins_direction_input(gpio);
+
+	gpio -= ADM5120_GPIO_P0L0;
+	return leds_direction_input(gpio);
+}
+
+int adm5120_gpio_direction_output(unsigned gpio, int value)
+{
+	if (gpio_is_invalid(gpio))
+		return -EINVAL;
+
+	if (gpio < ADM5120_GPIO_P0L0)
+		return pins_direction_output(gpio, value);
+
+	gpio -= ADM5120_GPIO_P0L0;
+	return leds_direction_output(gpio, value);
+}
+
+int adm5120_gpio_get_value(unsigned gpio)
+{
+	if (gpio < ADM5120_GPIO_P0L0)
+		return pins_get_value(gpio);
+
+	gpio -= ADM5120_GPIO_P0L0;
+	return leds_get_value(gpio);
+}
+
+void adm5120_gpio_set_value(unsigned gpio, int value)
+{
+	if (gpio < ADM5120_GPIO_P0L0) {
+		pins_set_value(gpio, value);
+		return;
+	}
+
+	gpio -= ADM5120_GPIO_P0L0;
+	leds_set_value(gpio, value);
+}
+
+int adm5120_gpio_request(unsigned gpio, const char *label)
+{
+	if (gpio_is_invalid(gpio))
+		return -EINVAL;
+
+	if (gpio_is_used(gpio))
+		return -EBUSY;
+
+	adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
+	adm5120_gpio_map[gpio].label = label;
+
+	return 0;
+}
+
+void adm5120_gpio_free(unsigned gpio)
+{
+	if (gpio_is_invalid(gpio))
+		return;
+
+	adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
+	adm5120_gpio_map[gpio].label = NULL;
+}
+
+int adm5120_gpio_to_irq(unsigned gpio)
+{
+	/* FIXME: not yet implemented */
+	return -EINVAL;
+}
+
+int adm5120_irq_to_gpio(unsigned irq)
+{
+	/* FIXME: not yet implemented */
+	return -EINVAL;
+}
+
+static int __init adm5120_gpio_init(void)
+{
+	int i;
+
+	if (adm5120_package_pqfp()) {
+		/* GPIO pins 4-7 are unavailable in ADM5120P */
+		for (i=ADM5120_GPIO_PIN4; i<=ADM5120_GPIO_PIN7; i++)
+			adm5120_gpio_map[i].flags &= ~GPIO_FLAG_VALID;
+	}
+
+	return 0;
+}
+
+subsys_initcall(adm5120_gpio_init);
+
+EXPORT_SYMBOL(adm5120_gpio_direction_output);
+EXPORT_SYMBOL(adm5120_gpio_direction_input);
+EXPORT_SYMBOL(adm5120_gpio_get_value);
+EXPORT_SYMBOL(adm5120_gpio_set_value);
+EXPORT_SYMBOL(adm5120_gpio_request);
+EXPORT_SYMBOL(adm5120_gpio_free);
+EXPORT_SYMBOL(adm5120_gpio_to_irq);
+EXPORT_SYMBOL(adm5120_irq_to_gpio);
+/*
+ *  $Id$
+ *
+ *  ADM5120 GPIO support
+ *
+ *  Copyright (C) 2007 OpenWrt.org
+ *  Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
+ *
+ *  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 <linux/autoconf.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+#include <asm/mach-adm5120/adm5120_defs.h>
+#include <asm/mach-adm5120/adm5120_info.h>
+#include <asm/mach-adm5120/adm5120_switch.h>
+
+typedef void __iomem *	gpio_reg_t;
+#define GPIO_READ(r)	readl((r))
+#define GPIO_WRITE(v,r)	writel((v),(r))
+#define GPIO_REG(r)	(gpio_reg_t)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r)
+
+struct adm5120_gpio_line {
+	u32 flags;
+	const char *label;
+};
+
+#define GPIO_FLAG_VALID		0x01
+#define GPIO_FLAG_USED		0x02
+
+struct led_desc {
+	gpio_reg_t reg;	/* LED register address */
+	u8 iv_shift;	/* shift amount for input bit */
+	u8 mode_shift;	/* shift amount for mode bits */
+};
+
+#define LED_DESC(_port,_led) { \
+		.reg = GPIO_REG(SWITCH_REG_PORT0_LED+_port*4), \
+		.iv_shift = LED0_IV_SHIFT+_led, \
+		.mode_shift = _led*4 \
+	}
+
+static struct led_desc led_table[15] = {
+	LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2),
+	LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2),
+	LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2),
+	LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2),
+	LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2)
+};
+
+static struct adm5120_gpio_line adm5120_gpio_map[ADM5120_GPIO_COUNT] = {
+	[ADM5120_GPIO_PIN0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN3] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN4] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN5] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN6] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_PIN7] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P0L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P0L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P0L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P1L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P1L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P1L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P2L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P2L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P2L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P3L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P3L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P3L2] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P4L0] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P4L1] = {.flags = GPIO_FLAG_VALID},
+	[ADM5120_GPIO_P4L2] = {.flags = GPIO_FLAG_VALID}
+};
+
+#define gpio_is_invalid(g) ( \
+		(g) > ADM5120_GPIO_MAX || \
+		((adm5120_gpio_map[(g)].flags & GPIO_FLAG_VALID) == 0) \
+	)
+
+#define gpio_is_used(g)	((adm5120_gpio_map[(g)].flags & GPIO_FLAG_USED) != 0)
+
+/*
+ * Helpers for GPIO lines in GPIO_CONF0 register
+ */
+#define PIN_IM(p)	((1 << GPIO_CONF0_IM_SHIFT) << p)
+#define PIN_IV(p)	((1 << GPIO_CONF0_IV_SHIFT) << p)
+#define PIN_OE(p)	((1 << GPIO_CONF0_OE_SHIFT) << p)
+#define PIN_OV(p)	((1 << GPIO_CONF0_OV_SHIFT) << p)
+
+static inline int pins_direction_input(unsigned pin)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	t &= ~(PIN_OE(pin));
+	t |= PIN_IM(pin);
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int pins_direction_output(unsigned pin, int value)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	t &= ~(PIN_IM(pin) | PIN_OV(pin));
+	t |= PIN_OE(pin);
+
+	if (value)
+		t |= PIN_OV(pin);
+
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int pins_get_value(unsigned pin)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	if ((t & PIN_IM(pin)) != 0)
+		t &= PIN_IV(pin);
+	else
+		t &= PIN_OV(pin);
+
+	return (t) ? 1 : 0;
+}
+
+static inline void pins_set_value(unsigned pin, int value)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
+
+	t = GPIO_READ(reg);
+	if (value == 0)
+		t &= ~(PIN_OV(pin));
+	else
+		t |= PIN_OV(pin);
+
+	GPIO_WRITE(t,reg);
+}
+
+/*
+ * Helpers for GPIO lines in PORTx_LED registers
+ */
+static inline int leds_direction_input(unsigned led)
+{
+	gpio_reg_t *reg;
+	u32 t;
+
+	reg = led_table[led].reg;
+	t = GPIO_READ(reg);
+	t &= ~(LED_MODE_MASK << led_table[led].mode_shift);
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int leds_direction_output(unsigned led, int value)
+{
+	gpio_reg_t *reg;
+	u32 t, s;
+
+	reg = led_table[led].reg;
+	s = led_table[led].mode_shift;
+
+	t = GPIO_READ(reg);
+	t &= ~(LED_MODE_MASK << s);
+	if (value)
+		t |= (LED_MODE_OUT_HIGH << s);
+	else
+		t |= (LED_MODE_OUT_LOW << s);
+
+	GPIO_WRITE(t,reg);
+
+	return 0;
+}
+
+static inline int leds_get_value(unsigned led)
+{
+	gpio_reg_t *reg;
+	u32 t, m;
+
+	reg = led_table[led].reg;
+
+	t = GPIO_READ(reg);
+	m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
+	if (m == LED_MODE_INPUT)
+		return (t >> led_table[led].iv_shift) & 1;
+
+	if (m == LED_MODE_OUT_LOW)
+		return 0;
+
+	return 1;
+}
+
+static inline void leds_set_value(unsigned led, int value)
+{
+	gpio_reg_t *reg;
+	u32 s,t;
+
+	reg = led_table[led].reg;
+	s = led_table[led].mode_shift;
+
+	t = GPIO_READ(reg);
+	t &= ~(LED_MODE_MASK << s);
+	if (value)
+		t |= (LED_MODE_OUT_HIGH << s);
+	else
+		t |= (LED_MODE_OUT_LOW << s);
+
+	GPIO_WRITE(t,reg);
+}
+
+/*
+ * Main GPIO support routines
+ */
+int adm5120_gpio_direction_input(unsigned gpio)
+{
+	if (gpio_is_invalid(gpio))
+		return -EINVAL;
+
+	if (gpio < ADM5120_GPIO_P0L0)
+		return pins_direction_input(gpio);
+
+	gpio -= ADM5120_GPIO_P0L0;
+	return leds_direction_input(gpio);
+}
+
+int adm5120_gpio_direction_output(unsigned gpio, int value)
+{
+	if (gpio_is_invalid(gpio))
+		return -EINVAL;
+
+	if (gpio < ADM5120_GPIO_P0L0)
+		return pins_direction_output(gpio, value);
+
+	gpio -= ADM5120_GPIO_P0L0;
+	return leds_direction_output(gpio, value);
+}
+
+int adm5120_gpio_get_value(unsigned gpio)
+{
+	if (gpio < ADM5120_GPIO_P0L0)
+		return pins_get_value(gpio);
+
+	gpio -= ADM5120_GPIO_P0L0;
+	return leds_get_value(gpio);
+}
+
+void adm5120_gpio_set_value(unsigned gpio, int value)
+{
+	if (gpio < ADM5120_GPIO_P0L0) {
+		pins_set_value(gpio, value);
+		return;
+	}
+
+	gpio -= ADM5120_GPIO_P0L0;
+	leds_set_value(gpio, value);
+}
+
+int adm5120_gpio_request(unsigned gpio, const char *label)
+{
+	if (gpio_is_invalid(gpio))
+		return -EINVAL;
+
+	if (gpio_is_used(gpio))
+		return -EBUSY;
+
+	adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
+	adm5120_gpio_map[gpio].label = label;
+
+	return 0;
+}
+
+void adm5120_gpio_free(unsigned gpio)
+{
+	if (gpio_is_invalid(gpio))
+		return;
+
+	adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
+	adm5120_gpio_map[gpio].label = NULL;
+}
+
+int adm5120_gpio_to_irq(unsigned gpio)
+{
+	/* FIXME: not yet implemented */
+	return -EINVAL;
+}
+
+int adm5120_irq_to_gpio(unsigned irq)
+{
+	/* FIXME: not yet implemented */
+	return -EINVAL;
+}
+
+static int __init adm5120_gpio_init(void)
+{
+	int i;
+
+	if (adm5120_package_pqfp()) {
+		/* GPIO pins 4-7 are unavailable in ADM5120P */
+		for (i=ADM5120_GPIO_PIN4; i<=ADM5120_GPIO_PIN7; i++)
+			adm5120_gpio_map[i].flags &= ~GPIO_FLAG_VALID;
+	}
+
+	return 0;
+}
+
+subsys_initcall(adm5120_gpio_init);
+
+EXPORT_SYMBOL(adm5120_gpio_direction_output);
+EXPORT_SYMBOL(adm5120_gpio_direction_input);
+EXPORT_SYMBOL(adm5120_gpio_get_value);
+EXPORT_SYMBOL(adm5120_gpio_set_value);
+EXPORT_SYMBOL(adm5120_gpio_request);
+EXPORT_SYMBOL(adm5120_gpio_free);
+EXPORT_SYMBOL(adm5120_gpio_to_irq);
+EXPORT_SYMBOL(adm5120_irq_to_gpio);