include/linux/basic_mmio_gpio.h

   1 /*
   2  * Basic memory-mapped GPIO controllers.
   3  *
   4  * Copyright 2008 MontaVista Software, Inc.
   5  * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #ifndef __BASIC_MMIO_GPIO_H
  14 #define __BASIC_MMIO_GPIO_H
  15
  16 #include <linux/gpio.h>
  17 #include <linux/types.h>
  18 #include <linux/compiler.h>
  19
  20 struct bgpio_pdata {
  21         int base;
  22         int ngpio;
  23 };
  24
  25 struct device;
  26
  27 struct bgpio_chip {
  28         struct gpio_chip gc;
  29
  30         unsigned long (*read_reg)(void __iomem *reg);
  31         void (*write_reg)(void __iomem *reg, unsigned long data);
  32
  33         void __iomem *reg_dat;
  34         void __iomem *reg_set;
  35         void __iomem *reg_clr;
  36         void __iomem *reg_dir;
  37
  38         /* Number of bits (GPIOs): <register width> * 8. */
  39         int bits;
  40
  41         /*
  42          * Some GPIO controllers work with the big-endian bits notation,
  43          * e.g. in a 8-bits register, GPIO7 is the least significant bit.
  44          */
  45         unsigned long (*pin2mask)(struct bgpio_chip *bgc, unsigned int pin);
  46
  47         /*
  48          * Used to lock bgpio_chip->data. Also, this is needed to keep
  49          * shadowed and real data registers writes together.
  50          */
  51         spinlock_t lock;
  52
  53         /* Shadowed data register to clear/set bits safely. */
  54         unsigned long data;
  55
  56         /* Shadowed direction registers to clear/set direction safely. */
  57         unsigned long dir;
  58 };
  59
  60 static inline struct bgpio_chip *to_bgpio_chip(struct gpio_chip *gc)
  61 {
  62         return container_of(gc, struct bgpio_chip, gc);
  63 }
  64
  65 int __devexit bgpio_remove(struct bgpio_chip *bgc);
  66 int __devinit bgpio_init(struct bgpio_chip *bgc,
  67                          struct device *dev,
  68                          unsigned long sz,
  69                          void __iomem *dat,
  70                          void __iomem *set,
  71                          void __iomem *clr,
  72                          void __iomem *dirout,
  73                          void __iomem *dirin,
  74                          bool big_endian);
  75
  76 #endif /* __BASIC_MMIO_GPIO_H */