LXR uboot/board/micronas/vct/gpio.c

   1/*
   2 * (C) Copyright 2008 Stefan Roese <sr@denx.de>, DENX Software Engineering
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 */
   6
   7#include <common.h>
   8#include <asm/io.h>
   9#include "vct.h"
  10
  11/*
  12 * Find out to which of the 2 gpio modules the pin specified in the
  13 * argument belongs:
  14 * GPIO_MODULE yields 0 for pins  0 to 31,
  15 *                    1 for pins 32 to 63
  16 */
  17#define GPIO_MODULE(pin)        ((pin) >> 5)
  18
  19/*
  20 * Bit position within a 32-bit peripheral register (where every
  21 * bit is one bitslice)
  22 */
  23#define MASK(pin)               (1 << ((pin) & 0x1F))
  24#define BASE_ADDR(mod)          module_base[mod]
  25
  26/*
  27 * Lookup table for transforming gpio module number 0 to 2 to
  28 * address offsets
  29 */
  30static u32 module_base[] = {
  31        GPIO1_BASE,
  32        GPIO2_BASE
  33};
  34
  35static void clrsetbits(u32 addr, u32 and_mask, u32 or_mask)
  36{
  37        reg_write(addr, (reg_read(addr) & ~and_mask) | or_mask);
  38}
  39
  40int vct_gpio_dir(int pin, int dir)
  41{
  42        u32 gpio_base;
  43
  44        gpio_base = BASE_ADDR(GPIO_MODULE(pin));
  45
  46        if (dir == 0)
  47                clrsetbits(GPIO_SWPORTA_DDR(gpio_base), MASK(pin), 0);
  48        else
  49                clrsetbits(GPIO_SWPORTA_DDR(gpio_base), 0, MASK(pin));
  50
  51        return 0;
  52}
  53
  54void vct_gpio_set(int pin, int val)
  55{
  56        u32 gpio_base;
  57
  58        gpio_base = BASE_ADDR(GPIO_MODULE(pin));
  59
  60        if (val == 0)
  61                clrsetbits(GPIO_SWPORTA_DR(gpio_base), MASK(pin), 0);
  62        else
  63                clrsetbits(GPIO_SWPORTA_DR(gpio_base), 0, MASK(pin));
  64}
  65
  66int vct_gpio_get(int pin)
  67{
  68        u32 gpio_base;
  69        u32 value;
  70
  71        gpio_base = BASE_ADDR(GPIO_MODULE(pin));
  72        value = reg_read(GPIO_EXT_PORTA(gpio_base));
  73
  74        return ((value & MASK(pin)) ? 1 : 0);
  75}
  76