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         switch (bcm47xx_bus_type) {
  24 #ifdef CONFIG_BCM47XX_SSB
  25         case BCM47XX_BUS_TYPE_SSB:
  26                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
  27                     ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
  28                         return -EINVAL;
  29
  30                 if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
  31                     ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
  32                         return -EINVAL;
  33
  34                 if (test_and_set_bit(gpio, gpio_in_use))
  35                         return -EBUSY;
  36
  37                 return 0;
  38 #endif
  39         }
  40         return -EINVAL;
  41 }
  42 EXPORT_SYMBOL(gpio_request);
  43
  44 void gpio_free(unsigned gpio)
  45 {
  46         switch (bcm47xx_bus_type) {
  47 #ifdef CONFIG_BCM47XX_SSB
  48         case BCM47XX_BUS_TYPE_SSB:
  49                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
  50                     ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
  51                         return;
  52
  53                 if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
  54                     ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
  55                         return;
  56
  57                 clear_bit(gpio, gpio_in_use);
  58                 return;
  59 #endif
  60         }
  61 }
  62 EXPORT_SYMBOL(gpio_free);
  63
  64 int gpio_to_irq(unsigned gpio)
  65 {
  66         switch (bcm47xx_bus_type) {
  67 #ifdef CONFIG_BCM47XX_SSB
  68         case BCM47XX_BUS_TYPE_SSB:
  69                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco))
  70                         return ssb_mips_irq(bcm47xx_bus.ssb.chipco.dev) + 2;
  71                 else if (ssb_extif_available(&bcm47xx_bus.ssb.extif))
  72                         return ssb_mips_irq(bcm47xx_bus.ssb.extif.dev) + 2;
  73                 else
  74                         return -EINVAL;
  75 #endif
  76         }
  77         return -EINVAL;
  78 }
  79 EXPORT_SYMBOL_GPL(gpio_to_irq);