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/export.h>
  10 #include <linux/ssb/ssb.h>
  11 #include <linux/ssb/ssb_driver_chipcommon.h>
  12 #include <linux/ssb/ssb_driver_extif.h>
  13 #include <asm/mach-bcm47xx/bcm47xx.h>
  14 #include <asm/mach-bcm47xx/gpio.h>
  15
  16 #if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)
  17 static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
  18 #else
  19 static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
  20 #endif
  21
  22 int gpio_request(unsigned gpio, const char *tag)
  23 {
  24         switch (bcm47xx_bus_type) {
  25 #ifdef CONFIG_BCM47XX_SSB
  26         case BCM47XX_BUS_TYPE_SSB:
  27                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
  28                     ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
  29                         return -EINVAL;
  30
  31                 if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
  32                     ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
  33                         return -EINVAL;
  34
  35                 if (test_and_set_bit(gpio, gpio_in_use))
  36                         return -EBUSY;
  37
  38                 return 0;
  39 #endif
  40 #ifdef CONFIG_BCM47XX_BCMA
  41         case BCM47XX_BUS_TYPE_BCMA:
  42                 if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
  43                         return -EINVAL;
  44
  45                 if (test_and_set_bit(gpio, gpio_in_use))
  46                         return -EBUSY;
  47
  48                 return 0;
  49 #endif
  50         }
  51         return -EINVAL;
  52 }
  53 EXPORT_SYMBOL(gpio_request);
  54
  55 void gpio_free(unsigned gpio)
  56 {
  57         switch (bcm47xx_bus_type) {
  58 #ifdef CONFIG_BCM47XX_SSB
  59         case BCM47XX_BUS_TYPE_SSB:
  60                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
  61                     ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
  62                         return;
  63
  64                 if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
  65                     ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
  66                         return;
  67
  68                 clear_bit(gpio, gpio_in_use);
  69                 return;
  70 #endif
  71 #ifdef CONFIG_BCM47XX_BCMA
  72         case BCM47XX_BUS_TYPE_BCMA:
  73                 if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
  74                         return;
  75
  76                 clear_bit(gpio, gpio_in_use);
  77                 return;
  78 #endif
  79         }
  80 }
  81 EXPORT_SYMBOL(gpio_free);
  82
  83 int gpio_to_irq(unsigned gpio)
  84 {
  85         switch (bcm47xx_bus_type) {
  86 #ifdef CONFIG_BCM47XX_SSB
  87         case BCM47XX_BUS_TYPE_SSB:
  88                 if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco))
  89                         return ssb_mips_irq(bcm47xx_bus.ssb.chipco.dev) + 2;
  90                 else if (ssb_extif_available(&bcm47xx_bus.ssb.extif))
  91                         return ssb_mips_irq(bcm47xx_bus.ssb.extif.dev) + 2;
  92                 else
  93                         return -EINVAL;
  94 #endif
  95 #ifdef CONFIG_BCM47XX_BCMA
  96         case BCM47XX_BUS_TYPE_BCMA:
  97                 return bcma_core_mips_irq(bcm47xx_bus.bcma.bus.drv_cc.core) + 2;
  98 #endif
  99         }
 100         return -EINVAL;
 101 }
 102 EXPORT_SYMBOL_GPL(gpio_to_irq);