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 <log.h>
   7 #include <asm/gpio.h>
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <dm/pinctrl.h>
  11 #include <linux/io.h>
  12 #include "pinctrl-meson-gx.h"
  13
  14 static void meson_gx_pinmux_disable_other_groups(struct meson_pinctrl *priv,
  15                                                  unsigned int pin,
  16                                                  int sel_group)
  17 {
  18         struct meson_pmx_group *group;
  19         struct meson_gx_pmx_data *pmx_data;
  20         void __iomem *addr;
  21         int i, j;
  22
  23         for (i = 0; i < priv->data->num_groups; i++) {
  24                 group = &priv->data->groups[i];
  25                 pmx_data = (struct meson_gx_pmx_data *)group->data;
  26                 if (pmx_data->is_gpio || i == sel_group)
  27                         continue;
  28
  29                 for (j = 0; j < group->num_pins; j++) {
  30                         if (group->pins[j] == pin) {
  31                                 /* We have found a group using the pin */
  32                                 debug("pinmux: disabling %s\n", group->name);
  33                                 addr = priv->reg_mux + pmx_data->reg * 4;
  34                                 writel(readl(addr) & ~BIT(pmx_data->bit), addr);
  35                         }
  36                 }
  37         }
  38 }
  39
  40 static int meson_gx_pinmux_group_set(struct udevice *dev,
  41                                      unsigned int group_selector,
  42                                      unsigned int func_selector)
  43 {
  44         struct meson_pinctrl *priv = dev_get_priv(dev);
  45         const struct meson_pmx_group *group;
  46         const struct meson_pmx_func *func;
  47         struct meson_gx_pmx_data *pmx_data;
  48         void __iomem *addr;
  49         int i;
  50
  51         group = &priv->data->groups[group_selector];
  52         pmx_data = (struct meson_gx_pmx_data *)group->data;
  53         func = &priv->data->funcs[func_selector];
  54
  55         debug("pinmux: set group %s func %s\n", group->name, func->name);
  56
  57         /*
  58          * Disable groups using the same pins.
  59          * The selected group is not disabled to avoid glitches.
  60          */
  61         for (i = 0; i < group->num_pins; i++) {
  62                 meson_gx_pinmux_disable_other_groups(priv,
  63                                                      group->pins[i],
  64                                                      group_selector);
  65         }
  66
  67         /* Function 0 (GPIO) doesn't need any additional setting */
  68         if (func_selector) {
  69                 addr = priv->reg_mux + pmx_data->reg * 4;
  70                 writel(readl(addr) | BIT(pmx_data->bit), addr);
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int meson_gx_pinmux_get(struct udevice *dev,
  77                                       unsigned int selector,
  78                                       char *buf, int size)
  79 {
  80         struct meson_pinctrl *priv = dev_get_priv(dev);
  81         struct meson_pmx_group *group;
  82         struct meson_gx_pmx_data *pmx_data;
  83         void __iomem *addr;
  84         int i, j, pos = 0;
  85         unsigned int pin;
  86         u32 reg;
  87
  88         pin = selector + priv->data->pin_base;
  89
  90         for (i = 0; i < priv->data->num_groups; i++) {
  91                 group = &priv->data->groups[i];
  92                 pmx_data = (struct meson_gx_pmx_data *)group->data;
  93                 if (pmx_data->is_gpio)
  94                         continue;
  95
  96                 for (j = 0; j < group->num_pins; j++) {
  97                         if (group->pins[j] == pin) {
  98                                 /* We have found a group using the pin */
  99                                 addr = priv->reg_mux + pmx_data->reg * 4;
 100                                 reg = readl(addr) & BIT(pmx_data->bit);
 101                                 if (reg) {
 102                                         pos += snprintf(buf + pos, size - pos,
 103                                                         "%s ", group->name) - 1;
 104                                         return 0;
 105                                 }
 106                         }
 107                 }
 108         }
 109
 110         /* Fallback, must be used as GPIO */
 111         snprintf(buf, size, "%s or Unknown",
 112                  priv->data->groups[selector].name);
 113
 114         return 0;
 115 }
 116
 117 const struct pinconf_param meson_gx_pinconf_params[] = {
 118         { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
 119         { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
 120         { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
 121 };
 122
 123 const struct pinctrl_ops meson_gx_pinctrl_ops = {
 124         .get_groups_count = meson_pinctrl_get_groups_count,
 125         .get_group_name = meson_pinctrl_get_group_name,
 126         .get_functions_count = meson_pinmux_get_functions_count,
 127         .get_function_name = meson_pinmux_get_function_name,
 128         .pinmux_group_set = meson_gx_pinmux_group_set,
 129         .set_state = pinctrl_generic_set_state,
 130         .pinconf_params = meson_gx_pinconf_params,
 131         .pinconf_num_params = ARRAY_SIZE(meson_gx_pinconf_params),
 132         .pinconf_set = meson_pinconf_set,
 133         .pinconf_group_set = meson_pinconf_group_set,
 134         .get_pin_name = meson_pinctrl_get_pin_name,
 135         .get_pins_count = meson_pinctrl_get_pins_count,
 136         .get_pin_muxing = meson_gx_pinmux_get,
 137 };
 138
 139 static const struct dm_gpio_ops meson_gx_gpio_ops = {
 140         .set_value = meson_gpio_set,
 141         .get_value = meson_gpio_get,
 142         .get_function = meson_gpio_get_direction,
 143         .direction_input = meson_gpio_direction_input,
 144         .direction_output = meson_gpio_direction_output,
 145 };
 146
 147 const struct driver meson_gx_gpio_driver = {
 148         .name   = "meson-gx-gpio",
 149         .id     = UCLASS_GPIO,
 150         .probe  = meson_gpio_probe,
 151         .ops    = &meson_gx_gpio_ops,
 152 };