/*
 * Driver for the NVIDIA Tegra pinmux
 *
 * Copyright (c) 2011, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#ifndef __PINMUX_TEGRA_H__
#define __PINMUX_TEGRA_H__

enum tegra_pinconf_param {
        /* argument: tegra_pinconf_pull */
        TEGRA_PINCONF_PARAM_PULL,
        /* argument: tegra_pinconf_tristate */
        TEGRA_PINCONF_PARAM_TRISTATE,
        /* argument: Boolean */
        TEGRA_PINCONF_PARAM_ENABLE_INPUT,
        /* argument: Boolean */
        TEGRA_PINCONF_PARAM_OPEN_DRAIN,
        /* argument: Boolean */
        TEGRA_PINCONF_PARAM_LOCK,
        /* argument: Boolean */
        TEGRA_PINCONF_PARAM_IORESET,
        /* argument: Boolean */
        TEGRA_PINCONF_PARAM_HIGH_SPEED_MODE,
        /* argument: Boolean */
        TEGRA_PINCONF_PARAM_SCHMITT,
        /* argument: Boolean */
        TEGRA_PINCONF_PARAM_LOW_POWER_MODE,
        /* argument: Integer, range is HW-dependant */
        TEGRA_PINCONF_PARAM_DRIVE_DOWN_STRENGTH,
        /* argument: Integer, range is HW-dependant */
        TEGRA_PINCONF_PARAM_DRIVE_UP_STRENGTH,
        /* argument: Integer, range is HW-dependant */
        TEGRA_PINCONF_PARAM_SLEW_RATE_FALLING,
        /* argument: Integer, range is HW-dependant */
        TEGRA_PINCONF_PARAM_SLEW_RATE_RISING,
};

enum tegra_pinconf_pull {
        TEGRA_PINCONFIG_PULL_NONE,
        TEGRA_PINCONFIG_PULL_DOWN,
        TEGRA_PINCONFIG_PULL_UP,
};

enum tegra_pinconf_tristate {
        TEGRA_PINCONFIG_DRIVEN,
        TEGRA_PINCONFIG_TRISTATE,
};

#define TEGRA_PINCONF_PACK(_param_, _arg_) ((_param_) << 16 | (_arg_))
#define TEGRA_PINCONF_UNPACK_PARAM(_conf_) ((_conf_) >> 16)
#define TEGRA_PINCONF_UNPACK_ARG(_conf_) ((_conf_) & 0xffff)

/**
 * struct tegra_function - Tegra pinctrl mux function
 * @name: The name of the function, exported to pinctrl core.
 * @groups: An array of pin groups that may select this function.
 * @ngroups: The number of entries in @groups.
 */
struct tegra_function {
        const char *name;
        const char * const *groups;
        unsigned ngroups;
};

/**
 * struct tegra_pingroup - Tegra pin group
 * @mux_reg:            Mux register offset. -1 if unsupported.
 * @mux_bank:           Mux register bank. 0 if unsupported.
 * @mux_bit:            Mux register bit. 0 if unsupported.
 * @pupd_reg:           Pull-up/down register offset. -1 if unsupported.
 * @pupd_bank:          Pull-up/down register bank. 0 if unsupported.
 * @pupd_bit:           Pull-up/down register bit. 0 if unsupported.
 * @tri_reg:            Tri-state register offset. -1 if unsupported.
 * @tri_bank:           Tri-state register bank. 0 if unsupported.
 * @tri_bit:            Tri-state register bit. 0 if unsupported.
 * @einput_reg:         Enable-input register offset. -1 if unsupported.
 * @einput_bank:        Enable-input register bank. 0 if unsupported.
 * @einput_bit:         Enable-input register bit. 0 if unsupported.
 * @odrain_reg:         Open-drain register offset. -1 if unsupported.
 * @odrain_bank:        Open-drain register bank. 0 if unsupported.
 * @odrain_bit:         Open-drain register bit. 0 if unsupported.
 * @lock_reg:           Lock register offset. -1 if unsupported.
 * @lock_bank:          Lock register bank. 0 if unsupported.
 * @lock_bit:           Lock register bit. 0 if unsupported.
 * @ioreset_reg:        IO reset register offset. -1 if unsupported.
 * @ioreset_bank:       IO reset register bank. 0 if unsupported.
 * @ioreset_bit:        IO reset register bit. 0 if unsupported.
 * @drv_reg:            Drive fields register offset. -1 if unsupported.
 *                      This register contains the hsm, schmitt, lpmd, drvdn,
 *                      drvup, slwr, and slwf parameters.
 * @drv_bank:           Drive fields register bank. 0 if unsupported.
 * @hsm_bit:            High Speed Mode register bit. 0 if unsupported.
 * @schmitt_bit:        Scmitt register bit. 0 if unsupported.
 * @lpmd_bit:           Low Power Mode register bit. 0 if unsupported.
 * @drvdn_bit:          Drive Down register bit. 0 if unsupported.
 * @drvdn_width:        Drive Down field width. 0 if unsupported.
 * @drvup_bit:          Drive Up register bit. 0 if unsupported.
 * @drvup_width:        Drive Up field width. 0 if unsupported.
 * @slwr_bit:           Slew Rising register bit. 0 if unsupported.
 * @slwr_width:         Slew Rising field width. 0 if unsupported.
 * @slwf_bit:           Slew Falling register bit. 0 if unsupported.
 * @slwf_width:         Slew Falling field width. 0 if unsupported.
 *
 * A representation of a group of pins (possibly just one pin) in the Tegra
 * pin controller. Each group allows some parameter or parameters to be
 * configured. The most common is mux function selection. Many others exist
 * such as pull-up/down, tri-state, etc. Tegra's pin controller is complex;
 * certain groups may only support configuring certain parameters, hence
 * each parameter is optional, represented by a -1 "reg" value.
 */
struct tegra_pingroup {
        const char *name;
        const unsigned *pins;
        unsigned npins;
        unsigned funcs[4];
        unsigned func_safe;
        s16 mux_reg;
        s16 pupd_reg;
        s16 tri_reg;
        s16 einput_reg;
        s16 odrain_reg;
        s16 lock_reg;
        s16 ioreset_reg;
        s16 drv_reg;
        u32 mux_bank:2;
        u32 pupd_bank:2;
        u32 tri_bank:2;
        u32 einput_bank:2;
        u32 odrain_bank:2;
        u32 ioreset_bank:2;
        u32 lock_bank:2;
        u32 drv_bank:2;
        u32 mux_bit:5;
        u32 pupd_bit:5;
        u32 tri_bit:5;
        u32 einput_bit:5;
        u32 odrain_bit:5;
        u32 lock_bit:5;
        u32 ioreset_bit:5;
        u32 hsm_bit:5;
        u32 schmitt_bit:5;
        u32 lpmd_bit:5;
        u32 drvdn_bit:5;
        u32 drvup_bit:5;
        u32 slwr_bit:5;
        u32 slwf_bit:5;
        u32 drvdn_width:6;
        u32 drvup_width:6;
        u32 slwr_width:6;
        u32 slwf_width:6;
};

/**
 * struct tegra_pinctrl_soc_data - Tegra pin controller driver configuration
 * @ngpios:     The number of GPIO pins the pin controller HW affects.
 * @pins:       An array describing all pins the pin controller affects.
 *              All pins which are also GPIOs must be listed first within the
 *              array, and be numbered identically to the GPIO controller's
 *              numbering.
 * @npins:      The numbmer of entries in @pins.
 * @functions:  An array describing all mux functions the SoC supports.
 * @nfunctions: The numbmer of entries in @functions.
 * @groups:     An array describing all pin groups the pin SoC supports.
 * @ngroups:    The numbmer of entries in @groups.
 */
struct tegra_pinctrl_soc_data {
        unsigned ngpios;
        const struct pinctrl_pin_desc *pins;
        unsigned npins;
        const struct tegra_function *functions;
        unsigned nfunctions;
        const struct tegra_pingroup *groups;
        unsigned ngroups;
};

int tegra_pinctrl_probe(struct platform_device *pdev,
                        const struct tegra_pinctrl_soc_data *soc_data);
int tegra_pinctrl_remove(struct platform_device *pdev);

#endif