1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
4 *
5 * Copyright (C) 2016 David Lechner
6 */
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 0x00
20 #define DA850_PUPD_SEL 0x04
21
22 struct da850_pupd_data {
23 void __iomem *base;
24 struct pinctrl_desc desc;
25 struct pinctrl_dev *pinctrl;
26 };
27
28 static 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
da850_pupd_get_groups_count(struct pinctrl_dev * pctldev)35 static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
36 {
37 return ARRAY_SIZE(da850_pupd_group_names);
38 }
39
da850_pupd_get_group_name(struct pinctrl_dev * pctldev,unsigned int selector)40 static 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
da850_pupd_get_group_pins(struct pinctrl_dev * pctldev,unsigned int selector,const unsigned int ** pins,unsigned int * num_pins)46 static 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
56 static 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
da850_pupd_pin_config_group_get(struct pinctrl_dev * pctldev,unsigned int selector,unsigned long * config)64 static 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
da850_pupd_pin_config_group_set(struct pinctrl_dev * pctldev,unsigned int selector,unsigned long * configs,unsigned int num_configs)100 static 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
139 static 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
da850_pupd_probe(struct platform_device * pdev)145 static 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
da850_pupd_remove(struct platform_device * pdev)176 static int da850_pupd_remove(struct platform_device *pdev)
177 {
178 return 0;
179 }
180
181 static const struct of_device_id da850_pupd_of_match[] = {
182 { .compatible = "ti,da850-pupd" },
183 { }
184 };
185 MODULE_DEVICE_TABLE(of, da850_pupd_of_match);
186
187 static struct platform_driver da850_pupd_driver = {
188 .driver = {
189 .name = "ti-da850-pupd",
190 .of_match_table = da850_pupd_of_match,
191 },
192 .probe = da850_pupd_probe,
193 .remove = da850_pupd_remove,
194 };
195 module_platform_driver(da850_pupd_driver);
196
197 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
198 MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
199 MODULE_LICENSE("GPL");
200