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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups4 *5 * Copyright (C) 2016 David Lechner6 */7 8#include <linux/bitops.h>9#include <linux/device.h>10#include <linux/io.h>11#include <linux/ioport.h>12#include <linux/mod_devicetable.h>13#include <linux/module.h>14#include <linux/pinctrl/pinconf.h>15#include <linux/pinctrl/pinconf-generic.h>16#include <linux/pinctrl/pinctrl.h>17#include <linux/platform_device.h>18 19#define DA850_PUPD_ENA 0x0020#define DA850_PUPD_SEL 0x0421 22struct da850_pupd_data {23 void __iomem *base;24 struct pinctrl_desc desc;25 struct pinctrl_dev *pinctrl;26};27 28static const char * const da850_pupd_group_names[] = {29 "cp0", "cp1", "cp2", "cp3", "cp4", "cp5", "cp6", "cp7",30 "cp8", "cp9", "cp10", "cp11", "cp12", "cp13", "cp14", "cp15",31 "cp16", "cp17", "cp18", "cp19", "cp20", "cp21", "cp22", "cp23",32 "cp24", "cp25", "cp26", "cp27", "cp28", "cp29", "cp30", "cp31",33};34 35static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)36{37 return ARRAY_SIZE(da850_pupd_group_names);38}39 40static const char *da850_pupd_get_group_name(struct pinctrl_dev *pctldev,41 unsigned int selector)42{43 return da850_pupd_group_names[selector];44}45 46static int da850_pupd_get_group_pins(struct pinctrl_dev *pctldev,47 unsigned int selector,48 const unsigned int **pins,49 unsigned int *num_pins)50{51 *num_pins = 0;52 53 return 0;54}55 56static const struct pinctrl_ops da850_pupd_pctlops = {57 .get_groups_count = da850_pupd_get_groups_count,58 .get_group_name = da850_pupd_get_group_name,59 .get_group_pins = da850_pupd_get_group_pins,60 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,61 .dt_free_map = pinconf_generic_dt_free_map,62};63 64static int da850_pupd_pin_config_group_get(struct pinctrl_dev *pctldev,65 unsigned int selector,66 unsigned long *config)67{68 struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);69 enum pin_config_param param = pinconf_to_config_param(*config);70 u32 val;71 u16 arg;72 73 val = readl(data->base + DA850_PUPD_ENA);74 arg = !!(~val & BIT(selector));75 76 switch (param) {77 case PIN_CONFIG_BIAS_DISABLE:78 break;79 case PIN_CONFIG_BIAS_PULL_UP:80 case PIN_CONFIG_BIAS_PULL_DOWN:81 if (arg) {82 /* bias is disabled */83 arg = 0;84 break;85 }86 val = readl(data->base + DA850_PUPD_SEL);87 if (param == PIN_CONFIG_BIAS_PULL_DOWN)88 val = ~val;89 arg = !!(val & BIT(selector));90 break;91 default:92 return -EINVAL;93 }94 95 *config = pinconf_to_config_packed(param, arg);96 97 return 0;98}99 100static int da850_pupd_pin_config_group_set(struct pinctrl_dev *pctldev,101 unsigned int selector,102 unsigned long *configs,103 unsigned int num_configs)104{105 struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);106 u32 ena, sel;107 enum pin_config_param param;108 int i;109 110 ena = readl(data->base + DA850_PUPD_ENA);111 sel = readl(data->base + DA850_PUPD_SEL);112 113 for (i = 0; i < num_configs; i++) {114 param = pinconf_to_config_param(configs[i]);115 116 switch (param) {117 case PIN_CONFIG_BIAS_DISABLE:118 ena &= ~BIT(selector);119 break;120 case PIN_CONFIG_BIAS_PULL_UP:121 ena |= BIT(selector);122 sel |= BIT(selector);123 break;124 case PIN_CONFIG_BIAS_PULL_DOWN:125 ena |= BIT(selector);126 sel &= ~BIT(selector);127 break;128 default:129 return -EINVAL;130 }131 }132 133 writel(sel, data->base + DA850_PUPD_SEL);134 writel(ena, data->base + DA850_PUPD_ENA);135 136 return 0;137}138 139static const struct pinconf_ops da850_pupd_confops = {140 .is_generic = true,141 .pin_config_group_get = da850_pupd_pin_config_group_get,142 .pin_config_group_set = da850_pupd_pin_config_group_set,143};144 145static int da850_pupd_probe(struct platform_device *pdev)146{147 struct device *dev = &pdev->dev;148 struct da850_pupd_data *data;149 150 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);151 if (!data)152 return -ENOMEM;153 154 data->base = devm_platform_ioremap_resource(pdev, 0);155 if (IS_ERR(data->base)) {156 dev_err(dev, "Could not map resource\n");157 return PTR_ERR(data->base);158 }159 160 data->desc.name = dev_name(dev);161 data->desc.pctlops = &da850_pupd_pctlops;162 data->desc.confops = &da850_pupd_confops;163 data->desc.owner = THIS_MODULE;164 165 data->pinctrl = devm_pinctrl_register(dev, &data->desc, data);166 if (IS_ERR(data->pinctrl)) {167 dev_err(dev, "Failed to register pinctrl\n");168 return PTR_ERR(data->pinctrl);169 }170 171 platform_set_drvdata(pdev, data);172 173 return 0;174}175 176static const struct of_device_id da850_pupd_of_match[] = {177 { .compatible = "ti,da850-pupd" },178 { }179};180MODULE_DEVICE_TABLE(of, da850_pupd_of_match);181 182static struct platform_driver da850_pupd_driver = {183 .driver = {184 .name = "ti-da850-pupd",185 .of_match_table = da850_pupd_of_match,186 },187 .probe = da850_pupd_probe,188};189module_platform_driver(da850_pupd_driver);190 191MODULE_AUTHOR("David Lechner <david@lechnology.com>");192MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");193MODULE_LICENSE("GPL");194