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/bitops.h> 12#include <linux/io.h> 13#include "pinctrl-meson-gx.h" 14 15static void meson_gx_pinmux_disable_other_groups(struct meson_pinctrl *priv, 16 unsigned int pin, 17 int sel_group) 18{ 19 struct meson_pmx_group *group; 20 struct meson_gx_pmx_data *pmx_data; 21 void __iomem *addr; 22 int i, j; 23 24 for (i = 0; i < priv->data->num_groups; i++) { 25 group = &priv->data->groups[i]; 26 pmx_data = (struct meson_gx_pmx_data *)group->data; 27 if (pmx_data->is_gpio || i == sel_group) 28 continue; 29 30 for (j = 0; j < group->num_pins; j++) { 31 if (group->pins[j] == pin) { 32 /* We have found a group using the pin */ 33 debug("pinmux: disabling %s\n", group->name); 34 addr = priv->reg_mux + pmx_data->reg * 4; 35 writel(readl(addr) & ~BIT(pmx_data->bit), addr); 36 } 37 } 38 } 39} 40 41static int meson_gx_pinmux_group_set(struct udevice *dev, 42 unsigned int group_selector, 43 unsigned int func_selector) 44{ 45 struct meson_pinctrl *priv = dev_get_priv(dev); 46 const struct meson_pmx_group *group; 47 const struct meson_pmx_func *func; 48 struct meson_gx_pmx_data *pmx_data; 49 void __iomem *addr; 50 int i; 51 52 group = &priv->data->groups[group_selector]; 53 pmx_data = (struct meson_gx_pmx_data *)group->data; 54 func = &priv->data->funcs[func_selector]; 55 56 debug("pinmux: set group %s func %s\n", group->name, func->name); 57 58 /* 59 * Disable groups using the same pins. 60 * The selected group is not disabled to avoid glitches. 61 */ 62 for (i = 0; i < group->num_pins; i++) { 63 meson_gx_pinmux_disable_other_groups(priv, 64 group->pins[i], 65 group_selector); 66 } 67 68 /* Function 0 (GPIO) doesn't need any additional setting */ 69 if (func_selector) { 70 addr = priv->reg_mux + pmx_data->reg * 4; 71 writel(readl(addr) | BIT(pmx_data->bit), addr); 72 } 73 74 return 0; 75} 76 77static int meson_gx_pinmux_get(struct udevice *dev, 78 unsigned int selector, 79 char *buf, int size) 80{ 81 struct meson_pinctrl *priv = dev_get_priv(dev); 82 struct meson_pmx_group *group; 83 struct meson_gx_pmx_data *pmx_data; 84 void __iomem *addr; 85 int i, j, pos = 0; 86 unsigned int pin; 87 u32 reg; 88 89 pin = selector + priv->data->pin_base; 90 91 for (i = 0; i < priv->data->num_groups; i++) { 92 group = &priv->data->groups[i]; 93 pmx_data = (struct meson_gx_pmx_data *)group->data; 94 if (pmx_data->is_gpio) 95 continue; 96 97 for (j = 0; j < group->num_pins; j++) { 98 if (group->pins[j] == pin) { 99 /* We have found a group using the pin */ 100 addr = priv->reg_mux + pmx_data->reg * 4; 101 reg = readl(addr) & BIT(pmx_data->bit); 102 if (reg) { 103 pos += snprintf(buf + pos, size - pos, 104 "%s ", group->name) - 1; 105 return 0; 106 } 107 } 108 } 109 } 110 111 /* Fallback, must be used as GPIO */ 112 snprintf(buf, size, "%s or Unknown", 113 priv->data->groups[selector].name); 114 115 return 0; 116} 117 118const struct pinconf_param meson_gx_pinconf_params[] = { 119 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, 120 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, 121 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, 122}; 123 124const struct pinctrl_ops meson_gx_pinctrl_ops = { 125 .get_groups_count = meson_pinctrl_get_groups_count, 126 .get_group_name = meson_pinctrl_get_group_name, 127 .get_functions_count = meson_pinmux_get_functions_count, 128 .get_function_name = meson_pinmux_get_function_name, 129 .pinmux_group_set = meson_gx_pinmux_group_set, 130 .set_state = pinctrl_generic_set_state, 131 .pinconf_params = meson_gx_pinconf_params, 132 .pinconf_num_params = ARRAY_SIZE(meson_gx_pinconf_params), 133 .pinconf_set = meson_pinconf_set, 134 .pinconf_group_set = meson_pinconf_group_set, 135 .get_pin_name = meson_pinctrl_get_pin_name, 136 .get_pins_count = meson_pinctrl_get_pins_count, 137 .get_pin_muxing = meson_gx_pinmux_get, 138}; 139 140static const struct dm_gpio_ops meson_gx_gpio_ops = { 141 .set_value = meson_gpio_set, 142 .get_value = meson_gpio_get, 143 .get_function = meson_gpio_get_direction, 144 .direction_input = meson_gpio_direction_input, 145 .direction_output = meson_gpio_direction_output, 146}; 147 148U_BOOT_DRIVER(meson_gx_gpio_driver) = { 149 .name = "meson-gx-gpio", 150 .id = UCLASS_GPIO, 151 .probe = meson_gpio_probe, 152 .ops = &meson_gx_gpio_ops, 153}; 154