gpio.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2007 Aurelien Jarno <[email protected]>
 */

#include <linux/export.h>
#include <linux/ssb/ssb.h>
#include <linux/ssb/ssb_driver_chipcommon.h>
#include <linux/ssb/ssb_driver_extif.h>
#include <asm/mach-bcm47xx/bcm47xx.h>
#include <asm/mach-bcm47xx/gpio.h>

#if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)
static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
#else
static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
#endif

int gpio_request(unsigned gpio, const char *tag)
{
    switch (bcm47xx_bus_type) {
#ifdef CONFIG_BCM47XX_SSB
    case BCM47XX_BUS_TYPE_SSB:
        if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
            ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
            return -EINVAL;

        if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
            ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
            return -EINVAL;

        if (test_and_set_bit(gpio, gpio_in_use))
            return -EBUSY;

        return 0;
#endif
#ifdef CONFIG_BCM47XX_BCMA
    case BCM47XX_BUS_TYPE_BCMA:
        if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
            return -EINVAL;

        if (test_and_set_bit(gpio, gpio_in_use))
            return -EBUSY;

        return 0;
#endif
    }
    return -EINVAL;
}
EXPORT_SYMBOL(gpio_request);

void gpio_free(unsigned gpio)
{
    switch (bcm47xx_bus_type) {
#ifdef CONFIG_BCM47XX_SSB
    case BCM47XX_BUS_TYPE_SSB:
        if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
            ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
            return;

        if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
            ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
            return;

        clear_bit(gpio, gpio_in_use);
        return;
#endif
#ifdef CONFIG_BCM47XX_BCMA
    case BCM47XX_BUS_TYPE_BCMA:
        if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
            return;

        clear_bit(gpio, gpio_in_use);
        return;
#endif
    }
}
EXPORT_SYMBOL(gpio_free);

int gpio_to_irq(unsigned gpio)
{
    switch (bcm47xx_bus_type) {
#ifdef CONFIG_BCM47XX_SSB
    case BCM47XX_BUS_TYPE_SSB:
        if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco))
            return ssb_mips_irq(bcm47xx_bus.ssb.chipco.dev) + 2;
        else if (ssb_extif_available(&bcm47xx_bus.ssb.extif))
            return ssb_mips_irq(bcm47xx_bus.ssb.extif.dev) + 2;
        else
            return -EINVAL;
#endif
#ifdef CONFIG_BCM47XX_BCMA
    case BCM47XX_BUS_TYPE_BCMA:
        return bcma_core_mips_irq(bcm47xx_bus.bcma.bus.drv_cc.core) + 2;
#endif
    }
    return -EINVAL;
}
EXPORT_SYMBOL_GPL(gpio_to_irq);