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Commit 01af72e4 authored by Tzachi Perelstein's avatar Tzachi Perelstein Committed by Russell King
Browse files

[ARM] Orion: GPIO support 



Signed-off-by: default avatarTzachi Perelstein <tzachi@marvell.com>
Signed-off-by: default avatarNicolas Pitre <nico@marvell.com>
Acked-by: default avatarDavid Brownell <david-b@pacbell.net>
parent c67de5b3

arch/arm/Kconfig

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@@ -337,6 +337,7 @@ config ARCH_ORION 
	bool "Marvell Orion"

	depends on MMU

	select PCI

	select GENERIC_GPIO

	help

	  Support for Marvell Orion System on Chip family.

arch/arm/mach-orion/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-y  += common.o addr-map.o pci.o
 
obj-y  += common.o addr-map.o pci.o gpio.o

arch/arm/mach-orion/common.h

+8 −0
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@@ -53,4 +53,12 @@ struct pci_bus *orion_pci_sys_scan_bus(int nr, struct pci_sys_data *sys); 
int orion_pci_hw_rd_conf(u32 bus, u32 dev, u32 func, u32 where, u32 size, u32 *val);

int orion_pci_hw_wr_conf(u32 bus, u32 dev, u32 func, u32 where, u32 size, u32 val);



/*

 * Valid GPIO pins according to MPP setup, used by machine-setup.

 * (/mach-orion/gpio.c).

 */



void __init orion_gpio_set_valid_pins(u32 pins);

void gpio_display(void);	/* debug */



#endif /* __ARCH_ORION_COMMON_H__ */

arch/arm/mach-orion/gpio.c

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Original line number Diff line number Diff line 
/*

 * arch/arm/mach-orion/gpio.c

 *

 * GPIO functions for Marvell Orion System On Chip

 *

 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>

 *

 * This file is licensed under  the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */



#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/spinlock.h>

#include <linux/bitops.h>

#include <asm/gpio.h>

#include <asm/arch/orion.h>

#include "common.h"



static DEFINE_SPINLOCK(gpio_lock);

static unsigned long gpio_valid[BITS_TO_LONGS(GPIO_MAX)];

static const char *gpio_label[GPIO_MAX];  /* non null for allocated GPIOs */



void __init orion_gpio_set_valid_pins(u32 pins)

{

	gpio_valid[0] = pins;

}



/*

 * GENERIC_GPIO primitives

 */

int gpio_direction_input(unsigned pin)

{

	unsigned long flags;



	if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {

		pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);

		return -EINVAL;

	}



	spin_lock_irqsave(&gpio_lock, flags);



	/*

	 * Some callers might have not used the gpio_request(),

	 * so flag this pin as requested now.

	 */

	if (!gpio_label[pin])

		gpio_label[pin] = "?";



	orion_setbits(GPIO_IO_CONF, 1 << pin);



	spin_unlock_irqrestore(&gpio_lock, flags);

	return 0;

}

EXPORT_SYMBOL(gpio_direction_input);



int gpio_direction_output(unsigned pin, int value)

{

	unsigned long flags;

	int mask;



	if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {

		pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);

		return -EINVAL;

	}



	spin_lock_irqsave(&gpio_lock, flags);



	/*

	 * Some callers might have not used the gpio_request(),

	 * so flag this pin as requested now.

	 */

	if (!gpio_label[pin])

		gpio_label[pin] = "?";



	mask = 1 << pin;

	if (value)

		orion_setbits(GPIO_OUT, mask);

	else

		orion_clrbits(GPIO_OUT, mask);

	orion_clrbits(GPIO_IO_CONF, mask);



	spin_unlock_irqrestore(&gpio_lock, flags);

	return 0;

}

EXPORT_SYMBOL(gpio_direction_output);



int gpio_get_value(unsigned pin)

{

	int val, mask = 1 << pin;



	if (orion_read(GPIO_IO_CONF) & mask)

		val = orion_read(GPIO_DATA_IN);

	else

		val = orion_read(GPIO_OUT);



	return val & mask;

}

EXPORT_SYMBOL(gpio_get_value);



void gpio_set_value(unsigned pin, int value)

{

	unsigned long flags;

	int mask = 1 << pin;



	spin_lock_irqsave(&gpio_lock, flags);



	if (value)

		orion_setbits(GPIO_OUT, mask);

	else

		orion_clrbits(GPIO_OUT, mask);



	spin_unlock_irqrestore(&gpio_lock, flags);

}

EXPORT_SYMBOL(gpio_set_value);



int gpio_request(unsigned pin, const char *label)

{

	int ret = 0;

	unsigned long flags;



	if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {

		pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);

		return -EINVAL;

	}



	spin_lock_irqsave(&gpio_lock, flags);



	if (gpio_label[pin]) {

		pr_debug("%s: GPIO %d already used as %s\n",

			 __FUNCTION__, pin, gpio_label[pin]);

		ret = -EBUSY;

	} else

		gpio_label[pin] = label ? label : "?";



	spin_unlock_irqrestore(&gpio_lock, flags);

	return ret;

}

EXPORT_SYMBOL(gpio_request);



void gpio_free(unsigned pin)

{

	if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {

		pr_debug("%s: invalid GPIO %d\n", __FUNCTION__, pin);

		return;

	}



	if (!gpio_label[pin])

		pr_warning("%s: GPIO %d already freed\n", __FUNCTION__, pin);

	else

		gpio_label[pin] = NULL;

}

EXPORT_SYMBOL(gpio_free);



/* Debug helper */

void gpio_display(void)

{

	int i;



	for (i = 0; i < GPIO_MAX; i++) {

		printk(KERN_DEBUG "Pin-%d: ", i);



		if (!test_bit(i, gpio_valid)) {

			printk("non-GPIO\n");

		} else if (!gpio_label[i]) {

			printk("GPIO, free\n");

		} else {

			printk("GPIO, used by %s, ", gpio_label[i]);

			if (orion_read(GPIO_IO_CONF) & (1 << i)) {

				printk("input, active %s, level %s, edge %s\n",

				((orion_read(GPIO_IN_POL) >> i) & 1) ? "low" : "high",

				((orion_read(GPIO_LEVEL_MASK) >> i) & 1) ? "enabled" : "masked",

				((orion_read(GPIO_EDGE_MASK) >> i) & 1) ? "enabled" : "masked");

			} else {

				printk("output, val=%d\n", (orion_read(GPIO_OUT) >> i) & 1);

			}

		}

	}



	printk(KERN_DEBUG "MPP_0_7_CTRL (0x%08x) = 0x%08x\n",

				MPP_0_7_CTRL, orion_read(MPP_0_7_CTRL));

	printk(KERN_DEBUG "MPP_8_15_CTRL (0x%08x) = 0x%08x\n",

				MPP_8_15_CTRL, orion_read(MPP_8_15_CTRL));

	printk(KERN_DEBUG "MPP_16_19_CTRL (0x%08x) = 0x%08x\n",

				MPP_16_19_CTRL, orion_read(MPP_16_19_CTRL));

	printk(KERN_DEBUG "MPP_DEV_CTRL (0x%08x) = 0x%08x\n",

				MPP_DEV_CTRL, orion_read(MPP_DEV_CTRL));

	printk(KERN_DEBUG "GPIO_OUT (0x%08x) = 0x%08x\n",

				GPIO_OUT, orion_read(GPIO_OUT));

	printk(KERN_DEBUG "GPIO_IO_CONF (0x%08x) = 0x%08x\n",

				GPIO_IO_CONF, orion_read(GPIO_IO_CONF));

	printk(KERN_DEBUG "GPIO_BLINK_EN (0x%08x) = 0x%08x\n",

				GPIO_BLINK_EN, orion_read(GPIO_BLINK_EN));

	printk(KERN_DEBUG "GPIO_IN_POL (0x%08x) = 0x%08x\n",

				GPIO_IN_POL, orion_read(GPIO_IN_POL));

	printk(KERN_DEBUG "GPIO_DATA_IN (0x%08x) = 0x%08x\n",

				GPIO_DATA_IN, orion_read(GPIO_DATA_IN));

	printk(KERN_DEBUG "GPIO_LEVEL_MASK (0x%08x) = 0x%08x\n",

				GPIO_LEVEL_MASK, orion_read(GPIO_LEVEL_MASK));

	printk(KERN_DEBUG "GPIO_EDGE_CAUSE (0x%08x) = 0x%08x\n",

				GPIO_EDGE_CAUSE, orion_read(GPIO_EDGE_CAUSE));

	printk(KERN_DEBUG "GPIO_EDGE_MASK (0x%08x) = 0x%08x\n",

				GPIO_EDGE_MASK, orion_read(GPIO_EDGE_MASK));

}

include/asm-arm/arch-orion/gpio.h

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/*

 * include/asm-arm/arch-orion/gpio.h

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */



extern int gpio_request(unsigned pin, const char *label);

extern void gpio_free(unsigned pin);

extern int gpio_direction_input(unsigned pin);

extern int gpio_direction_output(unsigned pin, int value);

extern int gpio_get_value(unsigned pin);

extern void gpio_set_value(unsigned pin, int value);

extern void gpio_display(void);		/* debug */



static inline int gpio_to_irq(int pin)

{

	return pin + IRQ_ORION_GPIO_START;

}



static inline int irq_to_gpio(int irq)

{

	return irq - IRQ_ORION_GPIO_START;

}



#include <asm-generic/gpio.h>		/* cansleep wrappers */