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![Neil Armstrong](/assets/img/avatar_default.png)
In order to support the "pinmux status" command, use the common functions to get the pins count and names, and add the GX specific function to get the current function from registers. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Tested-by: Maxime Jourdan <mjourdan@baylibre.com>
152 lines
4.1 KiB
C
152 lines
4.1 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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static int meson_gx_pinmux_get(struct udevice *dev,
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unsigned int selector,
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char *buf, int size)
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{
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struct meson_pinctrl *priv = dev_get_priv(dev);
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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, pos = 0;
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unsigned int pin;
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u32 reg;
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pin = selector + priv->data->pin_base;
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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)
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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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addr = priv->reg_mux + pmx_data->reg * 4;
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reg = readl(addr) & BIT(pmx_data->bit);
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if (reg) {
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pos += snprintf(buf + pos, size - pos,
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"%s ", group->name) - 1;
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return 0;
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}
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}
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}
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}
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/* Fallback, must be used as GPIO */
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snprintf(buf, size, "%s or Unknown",
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priv->data->groups[selector].name);
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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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.get_pin_name = meson_pinctrl_get_pin_name,
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.get_pins_count = meson_pinctrl_get_pins_count,
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.get_pin_muxing = meson_gx_pinmux_get,
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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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