linux/drivers/bcma/driver_gpio.c
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   1/*
   2 * Broadcom specific AMBA
   3 * GPIO driver
   4 *
   5 * Copyright 2011, Broadcom Corporation
   6 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
   7 *
   8 * Licensed under the GNU/GPL. See COPYING for details.
   9 */
  10
  11#include <linux/gpio.h>
  12#include <linux/export.h>
  13#include <linux/bcma/bcma.h>
  14
  15#include "bcma_private.h"
  16
  17static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip)
  18{
  19        return container_of(chip, struct bcma_drv_cc, gpio);
  20}
  21
  22static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
  23{
  24        struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
  25
  26        return !!bcma_chipco_gpio_in(cc, 1 << gpio);
  27}
  28
  29static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
  30                                int value)
  31{
  32        struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
  33
  34        bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
  35}
  36
  37static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
  38{
  39        struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
  40
  41        bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
  42        return 0;
  43}
  44
  45static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
  46                                      int value)
  47{
  48        struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
  49
  50        bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
  51        bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
  52        return 0;
  53}
  54
  55static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
  56{
  57        struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
  58
  59        bcma_chipco_gpio_control(cc, 1 << gpio, 0);
  60        /* clear pulldown */
  61        bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
  62        /* Set pullup */
  63        bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);
  64
  65        return 0;
  66}
  67
  68static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
  69{
  70        struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
  71
  72        /* clear pullup */
  73        bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
  74}
  75
  76int bcma_gpio_init(struct bcma_drv_cc *cc)
  77{
  78        struct gpio_chip *chip = &cc->gpio;
  79
  80        chip->label             = "bcma_gpio";
  81        chip->owner             = THIS_MODULE;
  82        chip->request           = bcma_gpio_request;
  83        chip->free              = bcma_gpio_free;
  84        chip->get               = bcma_gpio_get_value;
  85        chip->set               = bcma_gpio_set_value;
  86        chip->direction_input   = bcma_gpio_direction_input;
  87        chip->direction_output  = bcma_gpio_direction_output;
  88        chip->ngpio             = 16;
  89        /* There is just one SoC in one device and its GPIO addresses should be
  90         * deterministic to address them more easily. The other buses could get
  91         * a random base number. */
  92        if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
  93                chip->base              = 0;
  94        else
  95                chip->base              = -1;
  96
  97        return gpiochip_add(chip);
  98}
  99
 100int bcma_gpio_unregister(struct bcma_drv_cc *cc)
 101{
 102        return gpiochip_remove(&cc->gpio);
 103}
 104
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