mirror of
https://github.com/brain-hackers/u-boot-brain
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c4c726c26b
Adding pinconf support is necessary to enable boot from SPI without breaking the eMMC. When booting from SPI, the ROM code leave pull downs on the eMMC pad. We need to set pinconf provided in DT to solve this Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> [narmstrong: added missing comma in pinctrl-meson-axg-pmx.c]
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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