drivers/pinctrl/meson/pinctrl-meson.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Pin controller and GPIO driver for Amlogic Meson SoCs
   4  *
   5  * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
   6  */
   7
   8 #include <linux/gpio/driver.h>
   9 #include <linux/pinctrl/pinctrl.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/regmap.h>
  12 #include <linux/types.h>
  13
  14 struct meson_pinctrl;
  15
  16 /**
  17  * struct meson_pmx_group - a pinmux group
  18  *
  19  * @name:       group name
  20  * @pins:       pins in the group
  21  * @num_pins:   number of pins in the group
  22  * @is_gpio:    whether the group is a single GPIO group
  23  * @reg:        register offset for the group in the domain mux registers
  24  * @bit         bit index enabling the group
  25  * @domain:     index of the domain this group belongs to
  26  */
  27 struct meson_pmx_group {
  28         const char *name;
  29         const unsigned int *pins;
  30         unsigned int num_pins;
  31         const void *data;
  32 };
  33
  34 /**
  35  * struct meson_pmx_func - a pinmux function
  36  *
  37  * @name:       function name
  38  * @groups:     groups in the function
  39  * @num_groups: number of groups in the function
  40  */
  41 struct meson_pmx_func {
  42         const char *name;
  43         const char * const *groups;
  44         unsigned int num_groups;
  45 };
  46
  47 /**
  48  * struct meson_reg_desc - a register descriptor
  49  *
  50  * @reg:        register offset in the regmap
  51  * @bit:        bit index in register
  52  *
  53  * The structure describes the information needed to control pull,
  54  * pull-enable, direction, etc. for a single pin
  55  */
  56 struct meson_reg_desc {
  57         unsigned int reg;
  58         unsigned int bit;
  59 };
  60
  61 /**
  62  * enum meson_reg_type - type of registers encoded in @meson_reg_desc
  63  */
  64 enum meson_reg_type {
  65         REG_PULLEN,
  66         REG_PULL,
  67         REG_DIR,
  68         REG_OUT,
  69         REG_IN,
  70         REG_DS,
  71         NUM_REG,
  72 };
  73
  74 /**
  75  * enum meson_pinconf_drv - value of drive-strength supported
  76  */
  77 enum meson_pinconf_drv {
  78         MESON_PINCONF_DRV_500UA,
  79         MESON_PINCONF_DRV_2500UA,
  80         MESON_PINCONF_DRV_3000UA,
  81         MESON_PINCONF_DRV_4000UA,
  82 };
  83
  84 /**
  85  * struct meson bank
  86  *
  87  * @name:       bank name
  88  * @first:      first pin of the bank
  89  * @last:       last pin of the bank
  90  * @irq:        hwirq base number of the bank
  91  * @regs:       array of register descriptors
  92  *
  93  * A bank represents a set of pins controlled by a contiguous set of
  94  * bits in the domain registers. The structure specifies which bits in
  95  * the regmap control the different functionalities. Each member of
  96  * the @regs array refers to the first pin of the bank.
  97  */
  98 struct meson_bank {
  99         const char *name;
 100         unsigned int first;
 101         unsigned int last;
 102         int irq_first;
 103         int irq_last;
 104         struct meson_reg_desc regs[NUM_REG];
 105 };
 106
 107 struct meson_pinctrl_data {
 108         const char *name;
 109         const struct pinctrl_pin_desc *pins;
 110         struct meson_pmx_group *groups;
 111         struct meson_pmx_func *funcs;
 112         unsigned int num_pins;
 113         unsigned int num_groups;
 114         unsigned int num_funcs;
 115         struct meson_bank *banks;
 116         unsigned int num_banks;
 117         const struct pinmux_ops *pmx_ops;
 118         void *pmx_data;
 119         int (*parse_dt)(struct meson_pinctrl *pc);
 120 };
 121
 122 struct meson_pinctrl {
 123         struct device *dev;
 124         struct pinctrl_dev *pcdev;
 125         struct pinctrl_desc desc;
 126         struct meson_pinctrl_data *data;
 127         struct regmap *reg_mux;
 128         struct regmap *reg_pullen;
 129         struct regmap *reg_pull;
 130         struct regmap *reg_gpio;
 131         struct regmap *reg_ds;
 132         struct gpio_chip chip;
 133         struct device_node *of_node;
 134 };
 135
 136 #define FUNCTION(fn)                                                    \
 137         {                                                               \
 138                 .name = #fn,                                            \
 139                 .groups = fn ## _groups,                                \
 140                 .num_groups = ARRAY_SIZE(fn ## _groups),                \
 141         }
 142
 143 #define BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib,     \
 144                 dsr, dsb)                                                      \
 145         {                                                               \
 146                 .name           = n,                                    \
 147                 .first          = f,                                    \
 148                 .last           = l,                                    \
 149                 .irq_first      = fi,                                   \
 150                 .irq_last       = li,                                   \
 151                 .regs = {                                               \
 152                         [REG_PULLEN]    = { per, peb },                 \
 153                         [REG_PULL]      = { pr, pb },                   \
 154                         [REG_DIR]       = { dr, db },                   \
 155                         [REG_OUT]       = { or, ob },                   \
 156                         [REG_IN]        = { ir, ib },                   \
 157                         [REG_DS]        = { dsr, dsb },                 \
 158                 },                                                      \
 159          }
 160
 161 #define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
 162         BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib, 0, 0)
 163
 164 #define MESON_PIN(x) PINCTRL_PIN(x, #x)
 165
 166 /* Common pmx functions */
 167 int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev);
 168 const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev,
 169                                     unsigned selector);
 170 int meson_pmx_get_groups(struct pinctrl_dev *pcdev,
 171                          unsigned selector,
 172                          const char * const **groups,
 173                          unsigned * const num_groups);
 174
 175 /* Common probe function */
 176 int meson_pinctrl_probe(struct platform_device *pdev);
 177 /* Common ao groups extra dt parse function for SoCs before g12a  */
 178 int meson8_aobus_parse_dt_extra(struct meson_pinctrl *pc);
 179 /* Common extra dt parse function for SoCs like A1  */
 180 int meson_a1_parse_dt_extra(struct meson_pinctrl *pc);