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 #ifdef CONFIG_BCM47XX_BCMA
  40         case BCM47XX_BUS_TYPE_BCMA:
  41                 if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
  42                         return -EINVAL;
  43
  44                 if (test_and_set_bit(gpio, gpio_in_use))
  45                         return -EBUSY;
  46
  47                 return 0;
  48 #endif
  49         }
  50         return -EINVAL;
  51 }
  52 EXPORT_SYMBOL(gpio_request);
  53
  54 void gpio_free(unsigned gpio)
  55 {
  56         switch (bcm47xx_bus_type) {
  57 #ifdef CONFIG_BCM47XX_SSB
  58         case BCM47XX_BUS_TYPE_SSB:
  59                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
  60                     ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
  61                         return;
  62
  63                 if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
  64                     ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
  65                         return;
  66
  67                 clear_bit(gpio, gpio_in_use);
  68                 return;
  69 #endif
  70 #ifdef CONFIG_BCM47XX_BCMA
  71         case BCM47XX_BUS_TYPE_BCMA:
  72                 if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
  73                         return;
  74
  75                 clear_bit(gpio, gpio_in_use);
  76                 return;
  77 #endif
  78         }
  79 }
  80 EXPORT_SYMBOL(gpio_free);
  81
  82 int gpio_to_irq(unsigned gpio)
  83 {
  84         switch (bcm47xx_bus_type) {
  85 #ifdef CONFIG_BCM47XX_SSB
  86         case BCM47XX_BUS_TYPE_SSB:
  87                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco))
  88                         return ssb_mips_irq(bcm47xx_bus.ssb.chipco.dev) + 2;
  89                 else if (ssb_extif_available(&bcm47xx_bus.ssb.extif))
  90                         return ssb_mips_irq(bcm47xx_bus.ssb.extif.dev) + 2;
  91                 else
  92                         return -EINVAL;
  93 #endif
  94 #ifdef CONFIG_BCM47XX_BCMA
  95         case BCM47XX_BUS_TYPE_BCMA:
  96                 return bcma_core_mips_irq(bcm47xx_bus.bcma.bus.drv_cc.core) + 2;
  97 #endif
  98         }
  99         return -EINVAL;
 100 }
 101 EXPORT_SYMBOL_GPL(gpio_to_irq);