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)
  16 static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
  17 #else
  18 static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
  19 #endif
  20
  21 int 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 }
  36 EXPORT_SYMBOL(gpio_request);
  37
  38 void 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 }
  50 EXPORT_SYMBOL(gpio_free);
  51
  52 int 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 }
  61 EXPORT_SYMBOL_GPL(gpio_to_irq);