drivers/pinctrl/mvebu/pinctrl-mvebu.h

   1 /*
   2  * Marvell MVEBU pinctrl driver
   3  *
   4  * Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
   5  *          Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #ifndef __PINCTRL_MVEBU_H__
  14 #define __PINCTRL_MVEBU_H__
  15
  16 /**
  17  * struct mvebu_mpp_ctrl - describe a mpp control
  18  * @name: name of the control group
  19  * @pid: first pin id handled by this control
  20  * @npins: number of pins controlled by this control
  21  * @mpp_get: (optional) special function to get mpp setting
  22  * @mpp_set: (optional) special function to set mpp setting
  23  * @mpp_gpio_req: (optional) special function to request gpio
  24  * @mpp_gpio_dir: (optional) special function to set gpio direction
  25  *
  26  * A mpp_ctrl describes a muxable unit, e.g. pin, group of pins, or
  27  * internal function, inside the SoC. Each muxable unit can be switched
  28  * between two or more different settings, e.g. assign mpp pin 13 to
  29  * uart1 or sata.
  30  *
  31  * The mpp_get/_set functions are mandatory and are used to get/set a
  32  * specific mode. The optional mpp_gpio_req/_dir functions can be used
  33  * to allow pin settings with varying gpio pins.
  34  */
  35 struct mvebu_mpp_ctrl {
  36         const char *name;
  37         u8 pid;
  38         u8 npins;
  39         unsigned *pins;
  40         int (*mpp_get)(unsigned pid, unsigned long *config);
  41         int (*mpp_set)(unsigned pid, unsigned long config);
  42         int (*mpp_gpio_req)(unsigned pid);
  43         int (*mpp_gpio_dir)(unsigned pid, bool input);
  44 };
  45
  46 /**
  47  * struct mvebu_mpp_ctrl_setting - describe a mpp ctrl setting
  48  * @val: ctrl setting value
  49  * @name: ctrl setting name, e.g. uart2, spi0 - unique per mpp_mode
  50  * @subname: (optional) additional ctrl setting name, e.g. rts, cts
  51  * @variant: (optional) variant identifier mask
  52  * @flags: (private) flags to store gpi/gpo/gpio capabilities
  53  *
  54  * A ctrl_setting describes a specific internal mux function that a mpp pin
  55  * can be switched to. The value (val) will be written in the corresponding
  56  * register for common mpp pin configuration registers on MVEBU. SoC specific
  57  * mpp_get/_set function may use val to distinguish between different settings.
  58  *
  59  * The name will be used to switch to this setting in DT description, e.g.
  60  * marvell,function = "uart2". subname is only for debugging purposes.
  61  *
  62  * If name is one of "gpi", "gpo", "gpio" gpio capabilities are
  63  * parsed during initialization and stored in flags.
  64  *
  65  * The variant can be used to combine different revisions of one SoC to a
  66  * common pinctrl driver. It is matched (AND) with variant of soc_info to
  67  * determine if a setting is available on the current SoC revision.
  68  */
  69 struct mvebu_mpp_ctrl_setting {
  70         u8 val;
  71         const char *name;
  72         const char *subname;
  73         u8 variant;
  74         u8 flags;
  75 #define  MVEBU_SETTING_GPO      (1 << 0)
  76 #define  MVEBU_SETTING_GPI      (1 << 1)
  77 };
  78
  79 /**
  80  * struct mvebu_mpp_mode - link ctrl and settings
  81  * @pid: first pin id handled by this mode
  82  * @settings: list of settings available for this mode
  83  *
  84  * A mode connects all available settings with the corresponding mpp_ctrl
  85  * given by pid.
  86  */
  87 struct mvebu_mpp_mode {
  88         u8 pid;
  89         struct mvebu_mpp_ctrl_setting *settings;
  90 };
  91
  92 /**
  93  * struct mvebu_pinctrl_soc_info - SoC specific info passed to pinctrl-mvebu
  94  * @variant: variant mask of soc_info
  95  * @controls: list of available mvebu_mpp_ctrls
  96  * @ncontrols: number of available mvebu_mpp_ctrls
  97  * @modes: list of available mvebu_mpp_modes
  98  * @nmodes: number of available mvebu_mpp_modes
  99  * @gpioranges: list of pinctrl_gpio_ranges
 100  * @ngpioranges: number of available pinctrl_gpio_ranges
 101  *
 102  * This struct describes all pinctrl related information for a specific SoC.
 103  * If variant is unequal 0 it will be matched (AND) with variant of each
 104  * setting and allows to distinguish between different revisions of one SoC.
 105  */
 106 struct mvebu_pinctrl_soc_info {
 107         u8 variant;
 108         struct mvebu_mpp_ctrl *controls;
 109         int ncontrols;
 110         struct mvebu_mpp_mode *modes;
 111         int nmodes;
 112         struct pinctrl_gpio_range *gpioranges;
 113         int ngpioranges;
 114 };
 115
 116 #define MPP_FUNC_CTRL(_idl, _idh, _name, _func)                 \
 117         {                                                       \
 118                 .name = _name,                                  \
 119                 .pid = _idl,                                    \
 120                 .npins = _idh - _idl + 1,                       \
 121                 .pins = (unsigned[_idh - _idl + 1]) { },        \
 122                 .mpp_get = _func ## _get,                       \
 123                 .mpp_set = _func ## _set,                       \
 124                 .mpp_gpio_req = NULL,                           \
 125                 .mpp_gpio_dir = NULL,                           \
 126         }
 127
 128 #define MPP_FUNC_GPIO_CTRL(_idl, _idh, _name, _func)            \
 129         {                                                       \
 130                 .name = _name,                                  \
 131                 .pid = _idl,                                    \
 132                 .npins = _idh - _idl + 1,                       \
 133                 .pins = (unsigned[_idh - _idl + 1]) { },        \
 134                 .mpp_get = _func ## _get,                       \
 135                 .mpp_set = _func ## _set,                       \
 136                 .mpp_gpio_req = _func ## _gpio_req,             \
 137                 .mpp_gpio_dir = _func ## _gpio_dir,             \
 138         }
 139
 140 #define _MPP_VAR_FUNCTION(_val, _name, _subname, _mask)         \
 141         {                                                       \
 142                 .val = _val,                                    \
 143                 .name = _name,                                  \
 144                 .subname = _subname,                            \
 145                 .variant = _mask,                               \
 146                 .flags = 0,                                     \
 147         }
 148
 149 #if defined(CONFIG_DEBUG_FS)
 150 #define MPP_VAR_FUNCTION(_val, _name, _subname, _mask)          \
 151         _MPP_VAR_FUNCTION(_val, _name, _subname, _mask)
 152 #else
 153 #define MPP_VAR_FUNCTION(_val, _name, _subname, _mask)          \
 154         _MPP_VAR_FUNCTION(_val, _name, NULL, _mask)
 155 #endif
 156
 157 #define MPP_FUNCTION(_val, _name, _subname)                     \
 158         MPP_VAR_FUNCTION(_val, _name, _subname, (u8)-1)
 159
 160 #define MPP_MODE(_id, ...)                                      \
 161         {                                                       \
 162                 .pid = _id,                                     \
 163                 .settings = (struct mvebu_mpp_ctrl_setting[]){  \
 164                         __VA_ARGS__, { } },                     \
 165         }
 166
 167 #define MPP_GPIO_RANGE(_id, _pinbase, _gpiobase, _npins)        \
 168         {                                                       \
 169                 .name = "mvebu-gpio",                           \
 170                 .id = _id,                                      \
 171                 .pin_base = _pinbase,                           \
 172                 .base = _gpiobase,                              \
 173                 .npins = _npins,                                \
 174         }
 175
 176 #define MVEBU_MPPS_PER_REG      8
 177 #define MVEBU_MPP_BITS          4
 178 #define MVEBU_MPP_MASK          0xf
 179
 180 static inline int default_mpp_ctrl_get(void __iomem *base, unsigned int pid,
 181                                        unsigned long *config)
 182 {
 183         unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 184         unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 185
 186         *config = (readl(base + off) >> shift) & MVEBU_MPP_MASK;
 187
 188         return 0;
 189 }
 190
 191 static inline int default_mpp_ctrl_set(void __iomem *base, unsigned int pid,
 192                                        unsigned long config)
 193 {
 194         unsigned off = (pid / MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 195         unsigned shift = (pid % MVEBU_MPPS_PER_REG) * MVEBU_MPP_BITS;
 196         unsigned long reg;
 197
 198         reg = readl(base + off) & ~(MVEBU_MPP_MASK << shift);
 199         writel(reg | (config << shift), base + off);
 200
 201         return 0;
 202 }
 203
 204 int mvebu_pinctrl_probe(struct platform_device *pdev);
 205 int mvebu_pinctrl_remove(struct platform_device *pdev);
 206
 207 #endif