2 * Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
4 * Copyright (C) 2016 David Lechner
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #include <linux/bitops.h>
17 #include <linux/device.h>
19 #include <linux/ioport.h>
20 #include <linux/mod_devicetable.h>
21 #include <linux/module.h>
22 #include <linux/pinctrl/pinconf.h>
23 #include <linux/pinctrl/pinconf-generic.h>
24 #include <linux/pinctrl/pinctrl.h>
25 #include <linux/platform_device.h>
27 #define DA850_PUPD_ENA 0x00
28 #define DA850_PUPD_SEL 0x04
30 struct da850_pupd_data {
32 struct pinctrl_desc desc;
33 struct pinctrl_dev *pinctrl;
36 static const char * const da850_pupd_group_names[] = {
37 "cp0", "cp1", "cp2", "cp3", "cp4", "cp5", "cp6", "cp7",
38 "cp8", "cp9", "cp10", "cp11", "cp12", "cp13", "cp14", "cp15",
39 "cp16", "cp17", "cp18", "cp19", "cp20", "cp21", "cp22", "cp23",
40 "cp24", "cp25", "cp26", "cp27", "cp28", "cp29", "cp30", "cp31",
43 static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
45 return ARRAY_SIZE(da850_pupd_group_names);
48 static const char *da850_pupd_get_group_name(struct pinctrl_dev *pctldev,
49 unsigned int selector)
51 return da850_pupd_group_names[selector];
54 static int da850_pupd_get_group_pins(struct pinctrl_dev *pctldev,
55 unsigned int selector,
56 const unsigned int **pins,
57 unsigned int *num_pins)
64 static const struct pinctrl_ops da850_pupd_pctlops = {
65 .get_groups_count = da850_pupd_get_groups_count,
66 .get_group_name = da850_pupd_get_group_name,
67 .get_group_pins = da850_pupd_get_group_pins,
68 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
69 .dt_free_map = pinconf_generic_dt_free_map,
72 static int da850_pupd_pin_config_group_get(struct pinctrl_dev *pctldev,
73 unsigned int selector,
74 unsigned long *config)
76 struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
77 enum pin_config_param param = pinconf_to_config_param(*config);
81 val = readl(data->base + DA850_PUPD_ENA);
82 arg = !!(~val & BIT(selector));
85 case PIN_CONFIG_BIAS_DISABLE:
87 case PIN_CONFIG_BIAS_PULL_UP:
88 case PIN_CONFIG_BIAS_PULL_DOWN:
90 /* bias is disabled */
94 val = readl(data->base + DA850_PUPD_SEL);
95 if (param == PIN_CONFIG_BIAS_PULL_DOWN)
97 arg = !!(val & BIT(selector));
103 *config = pinconf_to_config_packed(param, arg);
108 static int da850_pupd_pin_config_group_set(struct pinctrl_dev *pctldev,
109 unsigned int selector,
110 unsigned long *configs,
111 unsigned int num_configs)
113 struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
115 enum pin_config_param param;
118 ena = readl(data->base + DA850_PUPD_ENA);
119 sel = readl(data->base + DA850_PUPD_SEL);
121 for (i = 0; i < num_configs; i++) {
122 param = pinconf_to_config_param(configs[i]);
125 case PIN_CONFIG_BIAS_DISABLE:
126 ena &= ~BIT(selector);
128 case PIN_CONFIG_BIAS_PULL_UP:
129 ena |= BIT(selector);
130 sel |= BIT(selector);
132 case PIN_CONFIG_BIAS_PULL_DOWN:
133 ena |= BIT(selector);
134 sel &= ~BIT(selector);
141 writel(sel, data->base + DA850_PUPD_SEL);
142 writel(ena, data->base + DA850_PUPD_ENA);
147 static const struct pinconf_ops da850_pupd_confops = {
149 .pin_config_group_get = da850_pupd_pin_config_group_get,
150 .pin_config_group_set = da850_pupd_pin_config_group_set,
153 static int da850_pupd_probe(struct platform_device *pdev)
155 struct device *dev = &pdev->dev;
156 struct da850_pupd_data *data;
157 struct resource *res;
159 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
163 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
164 data->base = devm_ioremap_resource(dev, res);
165 if (IS_ERR(data->base)) {
166 dev_err(dev, "Could not map resource\n");
167 return PTR_ERR(data->base);
170 data->desc.name = dev_name(dev);
171 data->desc.pctlops = &da850_pupd_pctlops;
172 data->desc.confops = &da850_pupd_confops;
173 data->desc.owner = THIS_MODULE;
175 data->pinctrl = devm_pinctrl_register(dev, &data->desc, data);
176 if (IS_ERR(data->pinctrl)) {
177 dev_err(dev, "Failed to register pinctrl\n");
178 return PTR_ERR(data->pinctrl);
181 platform_set_drvdata(pdev, data);
186 static int da850_pupd_remove(struct platform_device *pdev)
191 static const struct of_device_id da850_pupd_of_match[] = {
192 { .compatible = "ti,da850-pupd" },
195 MODULE_DEVICE_TABLE(of, da850_pupd_of_match);
197 static struct platform_driver da850_pupd_driver = {
199 .name = "ti-da850-pupd",
200 .of_match_table = da850_pupd_of_match,
202 .probe = da850_pupd_probe,
203 .remove = da850_pupd_remove,
205 module_platform_driver(da850_pupd_driver);
207 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
208 MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
209 MODULE_LICENSE("GPL");