src/soc/rockchip/rk3399/gpio.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <gpio.h>
  16 #include <soc/addressmap.h>
  17 #include <soc/gpio.h>
  18 #include <soc/grf.h>
  19 #include <soc/soc.h>
  20
  21 struct rockchip_gpio_regs *gpio_port[] = {
  22         (struct rockchip_gpio_regs *)GPIO0_BASE,
  23         (struct rockchip_gpio_regs *)GPIO1_BASE,
  24         (struct rockchip_gpio_regs *)GPIO2_BASE,
  25         (struct rockchip_gpio_regs *)GPIO3_BASE,
  26         (struct rockchip_gpio_regs *)GPIO4_BASE,
  27 };
  28
  29 #define PMU_GPIO_PORT0 0
  30 #define PMU_GPIO_PORT1 1
  31
  32 int is_pmu_gpio(gpio_t gpio)
  33 {
  34         if (gpio.port == PMU_GPIO_PORT0 || gpio.port == PMU_GPIO_PORT1)
  35                 return 1;
  36         return 0;
  37 }
  38
  39 void *gpio_grf_reg(gpio_t gpio)
  40 {
  41         if (is_pmu_gpio(gpio))
  42                 return &rk3399_pmugrf->gpio0_p[gpio.port][gpio.bank];
  43         /* There are two pmu gpio, 0 and 1, so " - 2" */
  44         return &rk3399_grf->gpio2_p[(gpio.port - 2)][gpio.bank];
  45 }
  46
  47 #define IS_GPIO_BANK(g, p, b) (g.port == p && g.bank == GPIO_##b)
  48
  49 enum {
  50         PULLNONE_1V8 = 0,
  51         PULLDOWN_1V8 = 1,
  52         PULLUP_1V8 = 3,
  53 };
  54
  55 u32 gpio_get_pull_val(gpio_t gpio, enum gpio_pull pull)
  56 {
  57         /* The default pull bias setting defined in soc/gpio.h */
  58         u32 pull_val = pull;
  59
  60         /* GPIO0_A, GPIO0_B, GPIO2_C, GPIO2_D use the 1V8 pull bias setting.
  61          * Defined in TRM V.03 Part1 Page 331 and Page 458
  62          */
  63         if (IS_GPIO_BANK(gpio, 0, A) || IS_GPIO_BANK(gpio, 0, B) ||
  64             IS_GPIO_BANK(gpio, 2, C) || IS_GPIO_BANK(gpio, 2, D)) {
  65                 switch (pull) {
  66                 case GPIO_PULLUP:
  67                         pull_val = PULLUP_1V8;
  68                         break;
  69                 case GPIO_PULLDOWN:
  70                         pull_val = PULLDOWN_1V8;
  71                         break;
  72                 case GPIO_PULLNONE:
  73                         pull_val = PULLNONE_1V8;
  74                 }
  75         }
  76
  77         return pull_val;
  78 }