LXR linux/arch/mips/bcm47xx/gpio.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
   7 */
   8
   9#include <linux/ssb/ssb.h>
  10#include <linux/ssb/ssb_driver_chipcommon.h>
  11#include <linux/ssb/ssb_driver_extif.h>
  12#include <asm/mach-bcm47xx/bcm47xx.h>
  13#include <asm/mach-bcm47xx/gpio.h>
  14
  15#if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)
  16static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
  17#else
  18static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
  19#endif
  20
  21int gpio_request(unsigned gpio, const char *tag)
  22{
  23        if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
  24            ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
  25                return -EINVAL;
  26
  27        if (ssb_extif_available(&ssb_bcm47xx.extif) &&
  28            ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
  29                return -EINVAL;
  30
  31        if (test_and_set_bit(gpio, gpio_in_use))
  32                return -EBUSY;
  33
  34        return 0;
  35}
  36EXPORT_SYMBOL(gpio_request);
  37
  38void gpio_free(unsigned gpio)
  39{
  40        if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
  41            ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
  42                return;
  43
  44        if (ssb_extif_available(&ssb_bcm47xx.extif) &&
  45            ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
  46                return;
  47
  48        clear_bit(gpio, gpio_in_use);
  49}
  50EXPORT_SYMBOL(gpio_free);
  51
  52int gpio_to_irq(unsigned gpio)
  53{
  54        if (ssb_chipco_available(&ssb_bcm47xx.chipco))
  55                return ssb_mips_irq(ssb_bcm47xx.chipco.dev) + 2;
  56        else if (ssb_extif_available(&ssb_bcm47xx.extif))
  57                return ssb_mips_irq(ssb_bcm47xx.extif.dev) + 2;
  58        else
  59                return -EINVAL;
  60}
  61EXPORT_SYMBOL_GPL(gpio_to_irq);
  62
  63