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