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       1                 :            : /* SPDX-License-Identifier: GPL-2.0-only */
       2                 :            : /*
       3                 :            :  * Core private header for the pin control subsystem
       4                 :            :  *
       5                 :            :  * Copyright (C) 2011 ST-Ericsson SA
       6                 :            :  * Written on behalf of Linaro for ST-Ericsson
       7                 :            :  *
       8                 :            :  * Author: Linus Walleij <linus.walleij@linaro.org>
       9                 :            :  */
      10                 :            : 
      11                 :            : #include <linux/kref.h>
      12                 :            : #include <linux/mutex.h>
      13                 :            : #include <linux/radix-tree.h>
      14                 :            : #include <linux/pinctrl/pinconf.h>
      15                 :            : #include <linux/pinctrl/machine.h>
      16                 :            : 
      17                 :            : struct pinctrl_gpio_range;
      18                 :            : 
      19                 :            : /**
      20                 :            :  * struct pinctrl_dev - pin control class device
      21                 :            :  * @node: node to include this pin controller in the global pin controller list
      22                 :            :  * @desc: the pin controller descriptor supplied when initializing this pin
      23                 :            :  *      controller
      24                 :            :  * @pin_desc_tree: each pin descriptor for this pin controller is stored in
      25                 :            :  *      this radix tree
      26                 :            :  * @pin_group_tree: optionally each pin group can be stored in this radix tree
      27                 :            :  * @num_groups: optionally number of groups can be kept here
      28                 :            :  * @pin_function_tree: optionally each function can be stored in this radix tree
      29                 :            :  * @num_functions: optionally number of functions can be kept here
      30                 :            :  * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
      31                 :            :  *      ranges are added to this list at runtime
      32                 :            :  * @dev: the device entry for this pin controller
      33                 :            :  * @owner: module providing the pin controller, used for refcounting
      34                 :            :  * @driver_data: driver data for drivers registering to the pin controller
      35                 :            :  *      subsystem
      36                 :            :  * @p: result of pinctrl_get() for this device
      37                 :            :  * @hog_default: default state for pins hogged by this device
      38                 :            :  * @hog_sleep: sleep state for pins hogged by this device
      39                 :            :  * @mutex: mutex taken on each pin controller specific action
      40                 :            :  * @device_root: debugfs root for this device
      41                 :            :  */
      42                 :            : struct pinctrl_dev {
      43                 :            :         struct list_head node;
      44                 :            :         struct pinctrl_desc *desc;
      45                 :            :         struct radix_tree_root pin_desc_tree;
      46                 :            : #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
      47                 :            :         struct radix_tree_root pin_group_tree;
      48                 :            :         unsigned int num_groups;
      49                 :            : #endif
      50                 :            : #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
      51                 :            :         struct radix_tree_root pin_function_tree;
      52                 :            :         unsigned int num_functions;
      53                 :            : #endif
      54                 :            :         struct list_head gpio_ranges;
      55                 :            :         struct device *dev;
      56                 :            :         struct module *owner;
      57                 :            :         void *driver_data;
      58                 :            :         struct pinctrl *p;
      59                 :            :         struct pinctrl_state *hog_default;
      60                 :            :         struct pinctrl_state *hog_sleep;
      61                 :            :         struct mutex mutex;
      62                 :            : #ifdef CONFIG_DEBUG_FS
      63                 :            :         struct dentry *device_root;
      64                 :            : #endif
      65                 :            : };
      66                 :            : 
      67                 :            : /**
      68                 :            :  * struct pinctrl - per-device pin control state holder
      69                 :            :  * @node: global list node
      70                 :            :  * @dev: the device using this pin control handle
      71                 :            :  * @states: a list of states for this device
      72                 :            :  * @state: the current state
      73                 :            :  * @dt_maps: the mapping table chunks dynamically parsed from device tree for
      74                 :            :  *      this device, if any
      75                 :            :  * @users: reference count
      76                 :            :  */
      77                 :            : struct pinctrl {
      78                 :            :         struct list_head node;
      79                 :            :         struct device *dev;
      80                 :            :         struct list_head states;
      81                 :            :         struct pinctrl_state *state;
      82                 :            :         struct list_head dt_maps;
      83                 :            :         struct kref users;
      84                 :            : };
      85                 :            : 
      86                 :            : /**
      87                 :            :  * struct pinctrl_state - a pinctrl state for a device
      88                 :            :  * @node: list node for struct pinctrl's @states field
      89                 :            :  * @name: the name of this state
      90                 :            :  * @settings: a list of settings for this state
      91                 :            :  */
      92                 :            : struct pinctrl_state {
      93                 :            :         struct list_head node;
      94                 :            :         const char *name;
      95                 :            :         struct list_head settings;
      96                 :            : };
      97                 :            : 
      98                 :            : /**
      99                 :            :  * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
     100                 :            :  * @group: the group selector to program
     101                 :            :  * @func: the function selector to program
     102                 :            :  */
     103                 :            : struct pinctrl_setting_mux {
     104                 :            :         unsigned group;
     105                 :            :         unsigned func;
     106                 :            : };
     107                 :            : 
     108                 :            : /**
     109                 :            :  * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_*
     110                 :            :  * @group_or_pin: the group selector or pin ID to program
     111                 :            :  * @configs: a pointer to an array of config parameters/values to program into
     112                 :            :  *      hardware. Each individual pin controller defines the format and meaning
     113                 :            :  *      of config parameters.
     114                 :            :  * @num_configs: the number of entries in array @configs
     115                 :            :  */
     116                 :            : struct pinctrl_setting_configs {
     117                 :            :         unsigned group_or_pin;
     118                 :            :         unsigned long *configs;
     119                 :            :         unsigned num_configs;
     120                 :            : };
     121                 :            : 
     122                 :            : /**
     123                 :            :  * struct pinctrl_setting - an individual mux or config setting
     124                 :            :  * @node: list node for struct pinctrl_settings's @settings field
     125                 :            :  * @type: the type of setting
     126                 :            :  * @pctldev: pin control device handling to be programmed. Not used for
     127                 :            :  *   PIN_MAP_TYPE_DUMMY_STATE.
     128                 :            :  * @dev_name: the name of the device using this state
     129                 :            :  * @data: Data specific to the setting type
     130                 :            :  */
     131                 :            : struct pinctrl_setting {
     132                 :            :         struct list_head node;
     133                 :            :         enum pinctrl_map_type type;
     134                 :            :         struct pinctrl_dev *pctldev;
     135                 :            :         const char *dev_name;
     136                 :            :         union {
     137                 :            :                 struct pinctrl_setting_mux mux;
     138                 :            :                 struct pinctrl_setting_configs configs;
     139                 :            :         } data;
     140                 :            : };
     141                 :            : 
     142                 :            : /**
     143                 :            :  * struct pin_desc - pin descriptor for each physical pin in the arch
     144                 :            :  * @pctldev: corresponding pin control device
     145                 :            :  * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
     146                 :            :  *      datasheet or such
     147                 :            :  * @dynamic_name: if the name of this pin was dynamically allocated
     148                 :            :  * @drv_data: driver-defined per-pin data. pinctrl core does not touch this
     149                 :            :  * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.
     150                 :            :  *      If non-zero, this pin is claimed by @owner. This field is an integer
     151                 :            :  *      rather than a boolean, since pinctrl_get() might process multiple
     152                 :            :  *      mapping table entries that refer to, and hence claim, the same group
     153                 :            :  *      or pin, and each of these will increment the @usecount.
     154                 :            :  * @mux_owner: The name of device that called pinctrl_get().
     155                 :            :  * @mux_setting: The most recent selected mux setting for this pin, if any.
     156                 :            :  * @gpio_owner: If pinctrl_gpio_request() was called for this pin, this is
     157                 :            :  *      the name of the GPIO that "owns" this pin.
     158                 :            :  */
     159                 :            : struct pin_desc {
     160                 :            :         struct pinctrl_dev *pctldev;
     161                 :            :         const char *name;
     162                 :            :         bool dynamic_name;
     163                 :            :         void *drv_data;
     164                 :            :         /* These fields only added when supporting pinmux drivers */
     165                 :            : #ifdef CONFIG_PINMUX
     166                 :            :         unsigned mux_usecount;
     167                 :            :         const char *mux_owner;
     168                 :            :         const struct pinctrl_setting_mux *mux_setting;
     169                 :            :         const char *gpio_owner;
     170                 :            : #endif
     171                 :            : };
     172                 :            : 
     173                 :            : /**
     174                 :            :  * struct pinctrl_maps - a list item containing part of the mapping table
     175                 :            :  * @node: mapping table list node
     176                 :            :  * @maps: array of mapping table entries
     177                 :            :  * @num_maps: the number of entries in @maps
     178                 :            :  */
     179                 :            : struct pinctrl_maps {
     180                 :            :         struct list_head node;
     181                 :            :         const struct pinctrl_map *maps;
     182                 :            :         unsigned num_maps;
     183                 :            : };
     184                 :            : 
     185                 :            : #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
     186                 :            : 
     187                 :            : /**
     188                 :            :  * struct group_desc - generic pin group descriptor
     189                 :            :  * @name: name of the pin group
     190                 :            :  * @pins: array of pins that belong to the group
     191                 :            :  * @num_pins: number of pins in the group
     192                 :            :  * @data: pin controller driver specific data
     193                 :            :  */
     194                 :            : struct group_desc {
     195                 :            :         const char *name;
     196                 :            :         int *pins;
     197                 :            :         int num_pins;
     198                 :            :         void *data;
     199                 :            : };
     200                 :            : 
     201                 :            : int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev);
     202                 :            : 
     203                 :            : const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
     204                 :            :                                            unsigned int group_selector);
     205                 :            : 
     206                 :            : int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
     207                 :            :                                    unsigned int group_selector,
     208                 :            :                                    const unsigned int **pins,
     209                 :            :                                    unsigned int *npins);
     210                 :            : 
     211                 :            : struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
     212                 :            :                                              unsigned int group_selector);
     213                 :            : 
     214                 :            : int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
     215                 :            :                               int *gpins, int ngpins, void *data);
     216                 :            : 
     217                 :            : int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
     218                 :            :                                  unsigned int group_selector);
     219                 :            : 
     220                 :            : #endif  /* CONFIG_GENERIC_PINCTRL_GROUPS */
     221                 :            : 
     222                 :            : struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
     223                 :            : struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np);
     224                 :            : int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
     225                 :            : const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin);
     226                 :            : int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
     227                 :            :                                const char *pin_group);
     228                 :            : 
     229                 :            : static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
     230                 :            :                                             unsigned int pin)
     231                 :            : {
     232                 :      19872 :         return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
     233                 :            : }
     234                 :            : 
     235                 :            : extern struct pinctrl_gpio_range *
     236                 :            : pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
     237                 :            :                                         unsigned int pin);
     238                 :            : 
     239                 :            : int pinctrl_register_map(const struct pinctrl_map *maps, unsigned num_maps,
     240                 :            :                          bool dup);
     241                 :            : void pinctrl_unregister_map(const struct pinctrl_map *map);
     242                 :            : 
     243                 :            : extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
     244                 :            : extern int pinctrl_force_default(struct pinctrl_dev *pctldev);
     245                 :            : 
     246                 :            : extern struct mutex pinctrl_maps_mutex;
     247                 :            : extern struct list_head pinctrl_maps;
     248                 :            : 
     249                 :            : #define for_each_maps(_maps_node_, _i_, _map_) \
     250                 :            :         list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
     251                 :            :                 for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \
     252                 :            :                         _i_ < _maps_node_->num_maps; \
     253                 :            :                         _i_++, _map_ = &_maps_node_->maps[_i_])