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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
*/
#include <asm/gpio.h>
#include <common.h>
#include <dm.h>
#include <dm/pinctrl.h>
#include <linux/io.h>
#include "pinctrl-meson-gx.h"
static void meson_gx_pinmux_disable_other_groups(struct meson_pinctrl *priv,
unsigned int pin,
int sel_group)
{
struct meson_pmx_group *group;
struct meson_gx_pmx_data *pmx_data;
void __iomem *addr;
int i, j;
for (i = 0; i < priv->data->num_groups; i++) {
group = &priv->data->groups[i];
pmx_data = (struct meson_gx_pmx_data *)group->data;
if (pmx_data->is_gpio || i == sel_group)
continue;
for (j = 0; j < group->num_pins; j++) {
if (group->pins[j] == pin) {
/* We have found a group using the pin */
debug("pinmux: disabling %s\n", group->name);
addr = priv->reg_mux + pmx_data->reg * 4;
writel(readl(addr) & ~BIT(pmx_data->bit), addr);
}
}
}
}
static int meson_gx_pinmux_group_set(struct udevice *dev,
unsigned int group_selector,
unsigned int func_selector)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
const struct meson_pmx_group *group;
const struct meson_pmx_func *func;
struct meson_gx_pmx_data *pmx_data;
void __iomem *addr;
int i;
group = &priv->data->groups[group_selector];
pmx_data = (struct meson_gx_pmx_data *)group->data;
func = &priv->data->funcs[func_selector];
debug("pinmux: set group %s func %s\n", group->name, func->name);
/*
* Disable groups using the same pins.
* The selected group is not disabled to avoid glitches.
*/
for (i = 0; i < group->num_pins; i++) {
meson_gx_pinmux_disable_other_groups(priv,
group->pins[i],
group_selector);
}
/* Function 0 (GPIO) doesn't need any additional setting */
if (func_selector) {
addr = priv->reg_mux + pmx_data->reg * 4;
writel(readl(addr) | BIT(pmx_data->bit), addr);
}
return 0;
}
static int meson_gx_pinmux_get(struct udevice *dev,
unsigned int selector,
char *buf, int size)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
struct meson_pmx_group *group;
struct meson_gx_pmx_data *pmx_data;
void __iomem *addr;
int i, j, pos = 0;
unsigned int pin;
u32 reg;
pin = selector + priv->data->pin_base;
for (i = 0; i < priv->data->num_groups; i++) {
group = &priv->data->groups[i];
pmx_data = (struct meson_gx_pmx_data *)group->data;
if (pmx_data->is_gpio)
continue;
for (j = 0; j < group->num_pins; j++) {
if (group->pins[j] == pin) {
/* We have found a group using the pin */
addr = priv->reg_mux + pmx_data->reg * 4;
reg = readl(addr) & BIT(pmx_data->bit);
if (reg) {
pos += snprintf(buf + pos, size - pos,
"%s ", group->name) - 1;
return 0;
}
}
}
}
/* Fallback, must be used as GPIO */
snprintf(buf, size, "%s or Unknown",
priv->data->groups[selector].name);
return 0;
}
const struct pinconf_param meson_gx_pinconf_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
};
const struct pinctrl_ops meson_gx_pinctrl_ops = {
.get_groups_count = meson_pinctrl_get_groups_count,
.get_group_name = meson_pinctrl_get_group_name,
.get_functions_count = meson_pinmux_get_functions_count,
.get_function_name = meson_pinmux_get_function_name,
.pinmux_group_set = meson_gx_pinmux_group_set,
.set_state = pinctrl_generic_set_state,
.pinconf_params = meson_gx_pinconf_params,
.pinconf_num_params = ARRAY_SIZE(meson_gx_pinconf_params),
.pinconf_set = meson_pinconf_set,
.pinconf_group_set = meson_pinconf_group_set,
.get_pin_name = meson_pinctrl_get_pin_name,
.get_pins_count = meson_pinctrl_get_pins_count,
.get_pin_muxing = meson_gx_pinmux_get,
};
static const struct dm_gpio_ops meson_gx_gpio_ops = {
.set_value = meson_gpio_set,
.get_value = meson_gpio_get,
.get_function = meson_gpio_get_direction,
.direction_input = meson_gpio_direction_input,
.direction_output = meson_gpio_direction_output,
};
const struct driver meson_gx_gpio_driver = {
.name = "meson-gx-gpio",
.id = UCLASS_GPIO,
.probe = meson_gpio_probe,
.ops = &meson_gx_gpio_ops,
};
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