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