1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2018 Jerome Brunet <jbrunet@baylibre.com> 4 * Copyright (C) 2017 Xingyu Chen <xingyu.chen@amlogic.com> 5 */ 6 7 #include <asm/gpio.h> 8 #include <common.h> 9 #include <dm.h> 10 #include <dm/pinctrl.h> 11 #include <linux/io.h> 12 #include "pinctrl-meson-axg.h" 13 14 static int meson_axg_pmx_get_bank(struct udevice *dev, unsigned int pin, 15 struct meson_pmx_bank **bank) 16 { 17 int i; 18 struct meson_pinctrl *priv = dev_get_priv(dev); 19 struct meson_axg_pmx_data *pmx = priv->data->pmx_data; 20 21 for (i = 0; i < pmx->num_pmx_banks; i++) 22 if (pin >= pmx->pmx_banks[i].first && 23 pin <= pmx->pmx_banks[i].last) { 24 *bank = &pmx->pmx_banks[i]; 25 return 0; 26 } 27 28 return -EINVAL; 29 } 30 31 static int meson_axg_pmx_calc_reg_and_offset(struct meson_pmx_bank *bank, 32 unsigned int pin, 33 unsigned int *reg, 34 unsigned int *offset) 35 { 36 int shift; 37 38 shift = pin - bank->first; 39 40 *reg = bank->reg + (bank->offset + (shift << 2)) / 32; 41 *offset = (bank->offset + (shift << 2)) % 32; 42 43 return 0; 44 } 45 46 static int meson_axg_pmx_update_function(struct udevice *dev, 47 unsigned int pin, unsigned int func) 48 { 49 struct meson_pinctrl *priv = dev_get_priv(dev); 50 struct meson_pmx_bank *bank; 51 unsigned int offset; 52 unsigned int reg; 53 unsigned int tmp; 54 int ret; 55 56 ret = meson_axg_pmx_get_bank(dev, pin, &bank); 57 if (ret) 58 return ret; 59 60 meson_axg_pmx_calc_reg_and_offset(bank, pin, ®, &offset); 61 62 tmp = readl(priv->reg_mux + (reg << 2)); 63 tmp &= ~(0xf << offset); 64 tmp |= (func & 0xf) << offset; 65 writel(tmp, priv->reg_mux + (reg << 2)); 66 67 return ret; 68 } 69 70 static int meson_axg_pinmux_group_set(struct udevice *dev, 71 unsigned int group_selector, 72 unsigned int func_selector) 73 { 74 struct meson_pinctrl *priv = dev_get_priv(dev); 75 const struct meson_pmx_group *group; 76 const struct meson_pmx_func *func; 77 struct meson_pmx_axg_data *pmx_data; 78 int i, ret; 79 80 group = &priv->data->groups[group_selector]; 81 pmx_data = (struct meson_pmx_axg_data *)group->data; 82 func = &priv->data->funcs[func_selector]; 83 84 debug("pinmux: set group %s func %s\n", group->name, func->name); 85 86 for (i = 0; i < group->num_pins; i++) { 87 ret = meson_axg_pmx_update_function(dev, group->pins[i], 88 pmx_data->func); 89 if (ret) 90 return ret; 91 } 92 93 return 0; 94 } 95 96 const struct pinconf_param meson_axg_pinconf_params[] = { 97 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, 98 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, 99 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, 100 }; 101 102 const struct pinctrl_ops meson_axg_pinctrl_ops = { 103 .get_groups_count = meson_pinctrl_get_groups_count, 104 .get_group_name = meson_pinctrl_get_group_name, 105 .get_functions_count = meson_pinmux_get_functions_count, 106 .get_function_name = meson_pinmux_get_function_name, 107 .pinmux_group_set = meson_axg_pinmux_group_set, 108 .set_state = pinctrl_generic_set_state, 109 .pinconf_params = meson_axg_pinconf_params, 110 .pinconf_num_params = ARRAY_SIZE(meson_axg_pinconf_params), 111 .pinconf_set = meson_pinconf_set, 112 .pinconf_group_set = meson_pinconf_group_set, 113 }; 114 115 static int meson_axg_gpio_request(struct udevice *dev, 116 unsigned int offset, const char *label) 117 { 118 return meson_axg_pmx_update_function(dev->parent, offset, 0); 119 } 120 121 static const struct dm_gpio_ops meson_axg_gpio_ops = { 122 .request = meson_axg_gpio_request, 123 .set_value = meson_gpio_set, 124 .get_value = meson_gpio_get, 125 .get_function = meson_gpio_get_direction, 126 .direction_input = meson_gpio_direction_input, 127 .direction_output = meson_gpio_direction_output, 128 }; 129 130 const struct driver meson_axg_gpio_driver = { 131 .name = "meson-axg-gpio", 132 .id = UCLASS_GPIO, 133 .probe = meson_gpio_probe, 134 .ops = &meson_axg_gpio_ops, 135 }; 136