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16#include <linux/bitops.h>
17#include <linux/device.h>
18#include <linux/io.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>
26
27#define DA850_PUPD_ENA 0x00
28#define DA850_PUPD_SEL 0x04
29
30struct da850_pupd_data {
31 void __iomem *base;
32 struct pinctrl_desc desc;
33 struct pinctrl_dev *pinctrl;
34};
35
36static 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",
41};
42
43static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
44{
45 return ARRAY_SIZE(da850_pupd_group_names);
46}
47
48static const char *da850_pupd_get_group_name(struct pinctrl_dev *pctldev,
49 unsigned int selector)
50{
51 return da850_pupd_group_names[selector];
52}
53
54static int da850_pupd_get_group_pins(struct pinctrl_dev *pctldev,
55 unsigned int selector,
56 const unsigned int **pins,
57 unsigned int *num_pins)
58{
59 *num_pins = 0;
60
61 return 0;
62}
63
64static 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,
70};
71
72static int da850_pupd_pin_config_group_get(struct pinctrl_dev *pctldev,
73 unsigned int selector,
74 unsigned long *config)
75{
76 struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
77 enum pin_config_param param = pinconf_to_config_param(*config);
78 u32 val;
79 u16 arg;
80
81 val = readl(data->base + DA850_PUPD_ENA);
82 arg = !!(~val & BIT(selector));
83
84 switch (param) {
85 case PIN_CONFIG_BIAS_DISABLE:
86 break;
87 case PIN_CONFIG_BIAS_PULL_UP:
88 case PIN_CONFIG_BIAS_PULL_DOWN:
89 if (arg) {
90
91 arg = 0;
92 break;
93 }
94 val = readl(data->base + DA850_PUPD_SEL);
95 if (param == PIN_CONFIG_BIAS_PULL_DOWN)
96 val = ~val;
97 arg = !!(val & BIT(selector));
98 break;
99 default:
100 return -EINVAL;
101 }
102
103 *config = pinconf_to_config_packed(param, arg);
104
105 return 0;
106}
107
108static int da850_pupd_pin_config_group_set(struct pinctrl_dev *pctldev,
109 unsigned int selector,
110 unsigned long *configs,
111 unsigned int num_configs)
112{
113 struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
114 u32 ena, sel;
115 enum pin_config_param param;
116 int i;
117
118 ena = readl(data->base + DA850_PUPD_ENA);
119 sel = readl(data->base + DA850_PUPD_SEL);
120
121 for (i = 0; i < num_configs; i++) {
122 param = pinconf_to_config_param(configs[i]);
123
124 switch (param) {
125 case PIN_CONFIG_BIAS_DISABLE:
126 ena &= ~BIT(selector);
127 break;
128 case PIN_CONFIG_BIAS_PULL_UP:
129 ena |= BIT(selector);
130 sel |= BIT(selector);
131 break;
132 case PIN_CONFIG_BIAS_PULL_DOWN:
133 ena |= BIT(selector);
134 sel &= ~BIT(selector);
135 break;
136 default:
137 return -EINVAL;
138 }
139 }
140
141 writel(sel, data->base + DA850_PUPD_SEL);
142 writel(ena, data->base + DA850_PUPD_ENA);
143
144 return 0;
145}
146
147static const struct pinconf_ops da850_pupd_confops = {
148 .is_generic = true,
149 .pin_config_group_get = da850_pupd_pin_config_group_get,
150 .pin_config_group_set = da850_pupd_pin_config_group_set,
151};
152
153static int da850_pupd_probe(struct platform_device *pdev)
154{
155 struct device *dev = &pdev->dev;
156 struct da850_pupd_data *data;
157 struct resource *res;
158
159 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
160 if (!data)
161 return -ENOMEM;
162
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);
168 }
169
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;
174
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);
179 }
180
181 platform_set_drvdata(pdev, data);
182
183 return 0;
184}
185
186static int da850_pupd_remove(struct platform_device *pdev)
187{
188 return 0;
189}
190
191static const struct of_device_id da850_pupd_of_match[] = {
192 { .compatible = "ti,da850-pupd" },
193 { }
194};
195MODULE_DEVICE_TABLE(of, da850_pupd_of_match);
196
197static struct platform_driver da850_pupd_driver = {
198 .driver = {
199 .name = "ti-da850-pupd",
200 .of_match_table = da850_pupd_of_match,
201 },
202 .probe = da850_pupd_probe,
203 .remove = da850_pupd_remove,
204};
205module_platform_driver(da850_pupd_driver);
206
207MODULE_AUTHOR("David Lechner <david@lechnology.com>");
208MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
209MODULE_LICENSE("GPL");
210
