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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * First generation of pinmux driver for Amlogic Meson SoCs4 *5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>6 * Copyright (C) 2017 Jerome Brunet <jbrunet@baylibre.com>7 */8 9/* For this first generation of pinctrl driver every pinmux group can be10 * enabled by a specific bit in the first register range. When all groups for11 * a given pin are disabled the pin acts as a GPIO.12 */13#include <linux/device.h>14#include <linux/regmap.h>15#include <linux/pinctrl/pinctrl.h>16#include <linux/pinctrl/pinmux.h>17 18#include "pinctrl-meson.h"19#include "pinctrl-meson8-pmx.h"20 21/**22 * meson8_pmx_disable_other_groups() - disable other groups using a given pin23 *24 * @pc: meson pin controller device25 * @pin: number of the pin26 * @sel_group: index of the selected group, or -1 if none27 *28 * The function disables all pinmux groups using a pin except the29 * selected one. If @sel_group is -1 all groups are disabled, leaving30 * the pin in GPIO mode.31 */32static void meson8_pmx_disable_other_groups(struct meson_pinctrl *pc,33 unsigned int pin, int sel_group)34{35 const struct meson_pmx_group *group;36 struct meson8_pmx_data *pmx_data;37 int i, j;38 39 for (i = 0; i < pc->data->num_groups; i++) {40 group = &pc->data->groups[i];41 pmx_data = (struct meson8_pmx_data *)group->data;42 if (pmx_data->is_gpio || i == sel_group)43 continue;44 45 for (j = 0; j < group->num_pins; j++) {46 if (group->pins[j] == pin) {47 /* We have found a group using the pin */48 regmap_update_bits(pc->reg_mux,49 pmx_data->reg * 4,50 BIT(pmx_data->bit), 0);51 }52 }53 }54}55 56static int meson8_pmx_set_mux(struct pinctrl_dev *pcdev, unsigned func_num,57 unsigned group_num)58{59 struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);60 const struct meson_pmx_func *func = &pc->data->funcs[func_num];61 const struct meson_pmx_group *group = &pc->data->groups[group_num];62 struct meson8_pmx_data *pmx_data =63 (struct meson8_pmx_data *)group->data;64 int i, ret = 0;65 66 dev_dbg(pc->dev, "enable function %s, group %s\n", func->name,67 group->name);68 69 /*70 * Disable groups using the same pin.71 * The selected group is not disabled to avoid glitches.72 */73 for (i = 0; i < group->num_pins; i++)74 meson8_pmx_disable_other_groups(pc, group->pins[i], group_num);75 76 /* Function 0 (GPIO) doesn't need any additional setting */77 if (func_num)78 ret = regmap_update_bits(pc->reg_mux, pmx_data->reg * 4,79 BIT(pmx_data->bit),80 BIT(pmx_data->bit));81 82 return ret;83}84 85static int meson8_pmx_request_gpio(struct pinctrl_dev *pcdev,86 struct pinctrl_gpio_range *range,87 unsigned offset)88{89 struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);90 91 meson8_pmx_disable_other_groups(pc, offset, -1);92 93 return 0;94}95 96const struct pinmux_ops meson8_pmx_ops = {97 .set_mux = meson8_pmx_set_mux,98 .get_functions_count = meson_pmx_get_funcs_count,99 .get_function_name = meson_pmx_get_func_name,100 .get_function_groups = meson_pmx_get_groups,101 .gpio_request_enable = meson8_pmx_request_gpio,102};103EXPORT_SYMBOL_GPL(meson8_pmx_ops);104MODULE_DESCRIPTION("Amlogic Meson SoCs first generation pinmux driver");105MODULE_LICENSE("GPL v2");106