1 /* 2 * Pin controller and GPIO driver for Amlogic Meson SoCs 3 * 4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * version 2 as published by the Free Software Foundation. 9 * 10 * You should have received a copy of the GNU General Public License 11 * along with this program. If not, see <http://www.gnu.org/licenses/>. 12 */ 13 14 #include <linux/gpio.h> 15 #include <linux/pinctrl/pinctrl.h> 16 #include <linux/regmap.h> 17 #include <linux/types.h> 18 19 /** 20 * struct meson_pmx_group - a pinmux group 21 * 22 * @name: group name 23 * @pins: pins in the group 24 * @num_pins: number of pins in the group 25 * @is_gpio: whether the group is a single GPIO group 26 * @reg: register offset for the group in the domain mux registers 27 * @bit bit index enabling the group 28 * @domain: index of the domain this group belongs to 29 */ 30 struct meson_pmx_group { 31 const char *name; 32 const unsigned int *pins; 33 unsigned int num_pins; 34 bool is_gpio; 35 unsigned int reg; 36 unsigned int bit; 37 }; 38 39 /** 40 * struct meson_pmx_func - a pinmux function 41 * 42 * @name: function name 43 * @groups: groups in the function 44 * @num_groups: number of groups in the function 45 */ 46 struct meson_pmx_func { 47 const char *name; 48 const char * const *groups; 49 unsigned int num_groups; 50 }; 51 52 /** 53 * struct meson_reg_desc - a register descriptor 54 * 55 * @reg: register offset in the regmap 56 * @bit: bit index in register 57 * 58 * The structure describes the information needed to control pull, 59 * pull-enable, direction, etc. for a single pin 60 */ 61 struct meson_reg_desc { 62 unsigned int reg; 63 unsigned int bit; 64 }; 65 66 /** 67 * enum meson_reg_type - type of registers encoded in @meson_reg_desc 68 */ 69 enum meson_reg_type { 70 REG_PULLEN, 71 REG_PULL, 72 REG_DIR, 73 REG_OUT, 74 REG_IN, 75 NUM_REG, 76 }; 77 78 /** 79 * struct meson bank 80 * 81 * @name: bank name 82 * @first: first pin of the bank 83 * @last: last pin of the bank 84 * @regs: array of register descriptors 85 * 86 * A bank represents a set of pins controlled by a contiguous set of 87 * bits in the domain registers. The structure specifies which bits in 88 * the regmap control the different functionalities. Each member of 89 * the @regs array refers to the first pin of the bank. 90 */ 91 struct meson_bank { 92 const char *name; 93 unsigned int first; 94 unsigned int last; 95 struct meson_reg_desc regs[NUM_REG]; 96 }; 97 98 struct meson_pinctrl_data { 99 const char *name; 100 const struct pinctrl_pin_desc *pins; 101 struct meson_pmx_group *groups; 102 struct meson_pmx_func *funcs; 103 unsigned int pin_base; 104 unsigned int num_pins; 105 unsigned int num_groups; 106 unsigned int num_funcs; 107 struct meson_bank *banks; 108 unsigned int num_banks; 109 }; 110 111 struct meson_pinctrl { 112 struct device *dev; 113 struct pinctrl_dev *pcdev; 114 struct pinctrl_desc desc; 115 struct meson_pinctrl_data *data; 116 struct regmap *reg_mux; 117 struct regmap *reg_pullen; 118 struct regmap *reg_pull; 119 struct regmap *reg_gpio; 120 struct gpio_chip chip; 121 struct device_node *of_node; 122 }; 123 124 #define PIN(x, b) (b + x) 125 126 #define GROUP(grp, r, b) \ 127 { \ 128 .name = #grp, \ 129 .pins = grp ## _pins, \ 130 .num_pins = ARRAY_SIZE(grp ## _pins), \ 131 .reg = r, \ 132 .bit = b, \ 133 } 134 135 #define GPIO_GROUP(gpio, b) \ 136 { \ 137 .name = #gpio, \ 138 .pins = (const unsigned int[]){ PIN(gpio, b) }, \ 139 .num_pins = 1, \ 140 .is_gpio = true, \ 141 } 142 143 #define FUNCTION(fn) \ 144 { \ 145 .name = #fn, \ 146 .groups = fn ## _groups, \ 147 .num_groups = ARRAY_SIZE(fn ## _groups), \ 148 } 149 150 #define BANK(n, f, l, per, peb, pr, pb, dr, db, or, ob, ir, ib) \ 151 { \ 152 .name = n, \ 153 .first = f, \ 154 .last = l, \ 155 .regs = { \ 156 [REG_PULLEN] = { per, peb }, \ 157 [REG_PULL] = { pr, pb }, \ 158 [REG_DIR] = { dr, db }, \ 159 [REG_OUT] = { or, ob }, \ 160 [REG_IN] = { ir, ib }, \ 161 }, \ 162 } 163 164 #define MESON_PIN(x, b) PINCTRL_PIN(PIN(x, b), #x) 165 166 extern struct meson_pinctrl_data meson8_cbus_pinctrl_data; 167 extern struct meson_pinctrl_data meson8_aobus_pinctrl_data; 168 extern struct meson_pinctrl_data meson8b_cbus_pinctrl_data; 169 extern struct meson_pinctrl_data meson8b_aobus_pinctrl_data; 170 extern struct meson_pinctrl_data meson_gxbb_periphs_pinctrl_data; 171 extern struct meson_pinctrl_data meson_gxbb_aobus_pinctrl_data; 172 extern struct meson_pinctrl_data meson_gxl_periphs_pinctrl_data; 173 extern struct meson_pinctrl_data meson_gxl_aobus_pinctrl_data; 174