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/platform_device.h> 17 #include <linux/regmap.h> 18 #include <linux/types.h> 19 20 /** 21 * struct meson_pmx_group - a pinmux group 22 * 23 * @name: group name 24 * @pins: pins in the group 25 * @num_pins: number of pins in the group 26 * @is_gpio: whether the group is a single GPIO group 27 * @reg: register offset for the group in the domain mux registers 28 * @bit bit index enabling the group 29 * @domain: index of the domain this group belongs to 30 */ 31 struct meson_pmx_group { 32 const char *name; 33 const unsigned int *pins; 34 unsigned int num_pins; 35 const void *data; 36 }; 37 38 /** 39 * struct meson_pmx_func - a pinmux function 40 * 41 * @name: function name 42 * @groups: groups in the function 43 * @num_groups: number of groups in the function 44 */ 45 struct meson_pmx_func { 46 const char *name; 47 const char * const *groups; 48 unsigned int num_groups; 49 }; 50 51 /** 52 * struct meson_reg_desc - a register descriptor 53 * 54 * @reg: register offset in the regmap 55 * @bit: bit index in register 56 * 57 * The structure describes the information needed to control pull, 58 * pull-enable, direction, etc. for a single pin 59 */ 60 struct meson_reg_desc { 61 unsigned int reg; 62 unsigned int bit; 63 }; 64 65 /** 66 * enum meson_reg_type - type of registers encoded in @meson_reg_desc 67 */ 68 enum meson_reg_type { 69 REG_PULLEN, 70 REG_PULL, 71 REG_DIR, 72 REG_OUT, 73 REG_IN, 74 NUM_REG, 75 }; 76 77 /** 78 * struct meson bank 79 * 80 * @name: bank name 81 * @first: first pin of the bank 82 * @last: last pin of the bank 83 * @irq: hwirq base number 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 int irq_first; 96 int irq_last; 97 struct meson_reg_desc regs[NUM_REG]; 98 }; 99 100 struct meson_pinctrl_data { 101 const char *name; 102 const struct pinctrl_pin_desc *pins; 103 struct meson_pmx_group *groups; 104 struct meson_pmx_func *funcs; 105 unsigned int num_pins; 106 unsigned int num_groups; 107 unsigned int num_funcs; 108 struct meson_bank *banks; 109 unsigned int num_banks; 110 const struct pinmux_ops *pmx_ops; 111 void *pmx_data; 112 }; 113 114 struct meson_pinctrl { 115 struct device *dev; 116 struct pinctrl_dev *pcdev; 117 struct pinctrl_desc desc; 118 struct meson_pinctrl_data *data; 119 struct regmap *reg_mux; 120 struct regmap *reg_pullen; 121 struct regmap *reg_pull; 122 struct regmap *reg_gpio; 123 struct gpio_chip chip; 124 struct device_node *of_node; 125 }; 126 127 #define FUNCTION(fn) \ 128 { \ 129 .name = #fn, \ 130 .groups = fn ## _groups, \ 131 .num_groups = ARRAY_SIZE(fn ## _groups), \ 132 } 133 134 #define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \ 135 { \ 136 .name = n, \ 137 .first = f, \ 138 .last = l, \ 139 .irq_first = fi, \ 140 .irq_last = li, \ 141 .regs = { \ 142 [REG_PULLEN] = { per, peb }, \ 143 [REG_PULL] = { pr, pb }, \ 144 [REG_DIR] = { dr, db }, \ 145 [REG_OUT] = { or, ob }, \ 146 [REG_IN] = { ir, ib }, \ 147 }, \ 148 } 149 150 #define MESON_PIN(x) PINCTRL_PIN(x, #x) 151 152 /* Common pmx functions */ 153 int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev); 154 const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev, 155 unsigned selector); 156 int meson_pmx_get_groups(struct pinctrl_dev *pcdev, 157 unsigned selector, 158 const char * const **groups, 159 unsigned * const num_groups); 160 161 /* Common probe function */ 162 int meson_pinctrl_probe(struct platform_device *pdev); 163