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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/bcm47xx/gpio.c
10817 views
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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 2007 Aurelien Jarno <[email protected]>

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 */

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#include <linux/ssb/ssb.h>

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#include <linux/ssb/ssb_driver_chipcommon.h>

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#include <linux/ssb/ssb_driver_extif.h>

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#include <asm/mach-bcm47xx/bcm47xx.h>

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#include <asm/mach-bcm47xx/gpio.h>

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#if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)

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static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);

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#else

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static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);

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#endif

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int gpio_request(unsigned gpio, const char *tag)

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{

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	if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&

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	    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))

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		return -EINVAL;

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	if (ssb_extif_available(&ssb_bcm47xx.extif) &&

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	    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))

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		return -EINVAL;

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	if (test_and_set_bit(gpio, gpio_in_use))

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		return -EBUSY;

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	return 0;

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}

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EXPORT_SYMBOL(gpio_request);

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void gpio_free(unsigned gpio)

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{

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	if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&

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	    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))

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		return;

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	if (ssb_extif_available(&ssb_bcm47xx.extif) &&

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	    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))

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		return;

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	clear_bit(gpio, gpio_in_use);

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}

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EXPORT_SYMBOL(gpio_free);

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int gpio_to_irq(unsigned gpio)

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{

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	if (ssb_chipco_available(&ssb_bcm47xx.chipco))

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		return ssb_mips_irq(ssb_bcm47xx.chipco.dev) + 2;

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	else if (ssb_extif_available(&ssb_bcm47xx.extif))

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		return ssb_mips_irq(ssb_bcm47xx.extif.dev) + 2;

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	else

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		return -EINVAL;

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}

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EXPORT_SYMBOL_GPL(gpio_to_irq);

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