drivers/pinctrl/meson/pinctrl-meson-gx-pmx.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
   4  */
   5
   6 #include <asm/gpio.h>
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <dm/pinctrl.h>
  10 #include <linux/io.h>
  11 #include "pinctrl-meson-gx.h"
  12
  13 static void meson_gx_pinmux_disable_other_groups(struct meson_pinctrl *priv,
  14                                                  unsigned int pin,
  15                                                  int sel_group)
  16 {
  17         struct meson_pmx_group *group;
  18         struct meson_gx_pmx_data *pmx_data;
  19         void __iomem *addr;
  20         int i, j;
  21
  22         for (i = 0; i < priv->data->num_groups; i++) {
  23                 group = &priv->data->groups[i];
  24                 pmx_data = (struct meson_gx_pmx_data *)group->data;
  25                 if (pmx_data->is_gpio || i == sel_group)
  26                         continue;
  27
  28                 for (j = 0; j < group->num_pins; j++) {
  29                         if (group->pins[j] == pin) {
  30                                 /* We have found a group using the pin */
  31                                 debug("pinmux: disabling %s\n", group->name);
  32                                 addr = priv->reg_mux + pmx_data->reg * 4;
  33                                 writel(readl(addr) & ~BIT(pmx_data->bit), addr);
  34                         }
  35                 }
  36         }
  37 }
  38
  39 static int meson_gx_pinmux_group_set(struct udevice *dev,
  40                                      unsigned int group_selector,
  41                                      unsigned int func_selector)
  42 {
  43         struct meson_pinctrl *priv = dev_get_priv(dev);
  44         const struct meson_pmx_group *group;
  45         const struct meson_pmx_func *func;
  46         struct meson_gx_pmx_data *pmx_data;
  47         void __iomem *addr;
  48         int i;
  49
  50         group = &priv->data->groups[group_selector];
  51         pmx_data = (struct meson_gx_pmx_data *)group->data;
  52         func = &priv->data->funcs[func_selector];
  53
  54         debug("pinmux: set group %s func %s\n", group->name, func->name);
  55
  56         /*
  57          * Disable groups using the same pins.
  58          * The selected group is not disabled to avoid glitches.
  59          */
  60         for (i = 0; i < group->num_pins; i++) {
  61                 meson_gx_pinmux_disable_other_groups(priv,
  62                                                      group->pins[i],
  63                                                      group_selector);
  64         }
  65
  66         /* Function 0 (GPIO) doesn't need any additional setting */
  67         if (func_selector) {
  68                 addr = priv->reg_mux + pmx_data->reg * 4;
  69                 writel(readl(addr) | BIT(pmx_data->bit), addr);
  70         }
  71
  72         return 0;
  73 }
  74
  75 const struct pinctrl_ops meson_gx_pinctrl_ops = {
  76         .get_groups_count = meson_pinctrl_get_groups_count,
  77         .get_group_name = meson_pinctrl_get_group_name,
  78         .get_functions_count = meson_pinmux_get_functions_count,
  79         .get_function_name = meson_pinmux_get_function_name,
  80         .pinmux_group_set = meson_gx_pinmux_group_set,
  81         .set_state = pinctrl_generic_set_state,
  82 };
  83
  84 static const struct dm_gpio_ops meson_gx_gpio_ops = {
  85         .set_value = meson_gpio_set,
  86         .get_value = meson_gpio_get,
  87         .get_function = meson_gpio_get_direction,
  88         .direction_input = meson_gpio_direction_input,
  89         .direction_output = meson_gpio_direction_output,
  90 };
  91
  92 const struct driver meson_gx_gpio_driver = {
  93         .name   = "meson-gx-gpio",
  94         .id     = UCLASS_GPIO,
  95         .probe  = meson_gpio_probe,
  96         .ops    = &meson_gx_gpio_ops,
  97 };