120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
|
|
/*
|
|
* Copyright (c) 2019 Amlogic, Inc. All rights reserved.
|
|
*/
|
|
|
|
/* For this first generation of pinctrl driver every pinmux group can be
|
|
* enabled by a specific bit in the first register range. When all groups for
|
|
* a given pin are disabled the pin acts as a GPIO.
|
|
*/
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <dm/pinctrl.h>
|
|
#include <linux/io.h>
|
|
|
|
#include "pinctrl-meson.h"
|
|
#include "pinctrl-meson8-pmx.h"
|
|
|
|
static const struct pinconf_param meson8_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 },
|
|
{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
|
|
{ "output-high", PIN_CONFIG_OUTPUT, 1 },
|
|
{ "output-low", PIN_CONFIG_OUTPUT, 0 },
|
|
};
|
|
|
|
/**
|
|
* meson8_pmx_disable_other_groups() - disable other groups using a given pin
|
|
*
|
|
* @priv: meson pin controller device
|
|
* @pin: number of the pin
|
|
* @sel_group: index of the selected group, or -1 if none
|
|
*
|
|
* The function disables all pinmux groups using a pin except the
|
|
* selected one. If @sel_group is -1 all groups are disabled, leaving
|
|
* the pin in GPIO mode.
|
|
*/
|
|
static void meson8_pmx_disable_other_groups(struct meson_pinctrl *priv,
|
|
unsigned int pin, int sel_group)
|
|
{
|
|
struct meson_pmx_group *group;
|
|
struct meson8_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 meson8_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 meson8_pmx_group_set(struct udevice *dev,
|
|
unsigned group_selector,
|
|
unsigned func_selector)
|
|
{
|
|
struct meson_pinctrl *priv = dev_get_priv(dev);
|
|
const struct meson_pmx_group *group;
|
|
const struct meson_pmx_func *func;
|
|
struct meson8_pmx_data *pmx_data;
|
|
void __iomem *addr;
|
|
int i;
|
|
|
|
group = &priv->data->groups[group_selector];
|
|
func = &priv->data->funcs[func_selector];
|
|
pmx_data = (struct meson8_pmx_data *)group->data;
|
|
|
|
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++) {
|
|
meson8_pmx_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 meson8_pmx_request_gpio(struct udevice *dev, int offset)
|
|
{
|
|
struct meson_pinctrl *priv = dev_get_priv(dev);
|
|
|
|
meson8_pmx_disable_other_groups(priv, offset, -1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct pinctrl_ops meson8_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 = meson8_pmx_group_set,
|
|
.set_state = pinctrl_generic_set_state,
|
|
.set_gpio_mux = meson8_pmx_request_gpio,
|
|
.pinconf_num_params = ARRAY_SIZE(meson8_pinconf_params),
|
|
.pinconf_params = meson8_pinconf_params,
|
|
.pinconf_group_set = meson_pinconf_group_set,
|
|
};
|