src/soc/mediatek/mt8173/gpio.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #include <device/mmio.h>
   3 #include <assert.h>
   4 #include <gpio.h>
   5 #include <types.h>
   6
   7 enum {
   8         MAX_GPIO_NUMBER = 134,
   9 };
  10
  11 static void pos_bit_calc(gpio_t gpio, u32 *pos, u32 *bit)
  12 {
  13         *pos = gpio.id / MAX_GPIO_REG_BITS;
  14         *bit = gpio.id % MAX_GPIO_REG_BITS;
  15 }
  16
  17 void gpio_set_pull(gpio_t gpio, enum pull_enable enable,
  18                    enum pull_select select)
  19 {
  20         u32 pos;
  21         u32 bit;
  22         u32 *en_reg, *sel_reg;
  23         u32 pin = gpio.id;
  24
  25         pos_bit_calc(gpio, &pos, &bit);
  26
  27         if (enable == GPIO_PULL_DISABLE) {
  28                 en_reg = &mtk_gpio->pullen[pos].rst;
  29         } else {
  30         /* These pins' pulls can't be set through GPIO controller. */
  31                 assert(pin < 22 || pin > 27);
  32                 assert(pin < 47 || pin > 56);
  33                 assert(pin < 57 || pin > 68);
  34                 assert(pin < 73 || pin > 78);
  35                 assert(pin < 100 || pin > 105);
  36                 assert(pin < 119 || pin > 124);
  37
  38                 en_reg = &mtk_gpio->pullen[pos].set;
  39                 sel_reg = (select == GPIO_PULL_DOWN) ?
  40                           (&mtk_gpio->pullsel[pos].rst) :
  41                           (&mtk_gpio->pullsel[pos].set);
  42                 write16(sel_reg, 1L << bit);
  43         }
  44         write16(en_reg, 1L << bit);
  45 }