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1ff91f0a DL |
1 | /* |
2 | * Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups | |
3 | * | |
4 | * Copyright (C) 2016 David Lechner | |
5 | * | |
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. | |
9 | * | |
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 | |
13 | * more details. | |
14 | */ | |
15 | ||
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 | ||
30 | struct da850_pupd_data { | |
31 | void __iomem *base; | |
32 | struct pinctrl_desc desc; | |
33 | struct pinctrl_dev *pinctrl; | |
34 | }; | |
35 | ||
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", | |
41 | }; | |
42 | ||
43 | static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev) | |
44 | { | |
45 | return ARRAY_SIZE(da850_pupd_group_names); | |
46 | } | |
47 | ||
48 | static 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 | ||
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) | |
58 | { | |
59 | *num_pins = 0; | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
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, | |
70 | }; | |
71 | ||
72 | static 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 | /* bias is disabled */ | |
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 | ||
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) | |
112 | { | |
113 | struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev); | |
114 | u32 ena, sel; | |
115 | enum pin_config_param param; | |
116 | u16 arg; | |
117 | int i; | |
118 | ||
119 | ena = readl(data->base + DA850_PUPD_ENA); | |
120 | sel = readl(data->base + DA850_PUPD_SEL); | |
121 | ||
122 | for (i = 0; i < num_configs; i++) { | |
123 | param = pinconf_to_config_param(configs[i]); | |
124 | arg = pinconf_to_config_argument(configs[i]); | |
125 | ||
126 | switch (param) { | |
127 | case PIN_CONFIG_BIAS_DISABLE: | |
128 | ena &= ~BIT(selector); | |
129 | break; | |
130 | case PIN_CONFIG_BIAS_PULL_UP: | |
131 | ena |= BIT(selector); | |
132 | sel |= BIT(selector); | |
133 | break; | |
134 | case PIN_CONFIG_BIAS_PULL_DOWN: | |
135 | ena |= BIT(selector); | |
136 | sel &= ~BIT(selector); | |
137 | break; | |
138 | default: | |
139 | return -EINVAL; | |
140 | } | |
141 | } | |
142 | ||
143 | writel(sel, data->base + DA850_PUPD_SEL); | |
144 | writel(ena, data->base + DA850_PUPD_ENA); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static const struct pinconf_ops da850_pupd_confops = { | |
150 | .is_generic = true, | |
151 | .pin_config_group_get = da850_pupd_pin_config_group_get, | |
152 | .pin_config_group_set = da850_pupd_pin_config_group_set, | |
153 | }; | |
154 | ||
155 | static int da850_pupd_probe(struct platform_device *pdev) | |
156 | { | |
157 | struct device *dev = &pdev->dev; | |
158 | struct da850_pupd_data *data; | |
159 | struct resource *res; | |
160 | ||
161 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
162 | if (!data) | |
163 | return -ENOMEM; | |
164 | ||
165 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
166 | data->base = devm_ioremap_resource(dev, res); | |
167 | if (IS_ERR(data->base)) { | |
168 | dev_err(dev, "Could not map resource\n"); | |
169 | return PTR_ERR(data->base); | |
170 | } | |
171 | ||
172 | data->desc.name = dev_name(dev); | |
173 | data->desc.pctlops = &da850_pupd_pctlops; | |
174 | data->desc.confops = &da850_pupd_confops; | |
175 | data->desc.owner = THIS_MODULE; | |
176 | ||
177 | data->pinctrl = devm_pinctrl_register(dev, &data->desc, data); | |
178 | if (IS_ERR(data->pinctrl)) { | |
179 | dev_err(dev, "Failed to register pinctrl\n"); | |
180 | return PTR_ERR(data->pinctrl); | |
181 | } | |
182 | ||
183 | platform_set_drvdata(pdev, data); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int da850_pupd_remove(struct platform_device *pdev) | |
189 | { | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static const struct of_device_id da850_pupd_of_match[] = { | |
194 | { .compatible = "ti,da850-pupd" }, | |
195 | { } | |
196 | }; | |
197 | ||
198 | static struct platform_driver da850_pupd_driver = { | |
199 | .driver = { | |
200 | .name = "ti-da850-pupd", | |
201 | .of_match_table = da850_pupd_of_match, | |
202 | }, | |
203 | .probe = da850_pupd_probe, | |
204 | .remove = da850_pupd_remove, | |
205 | }; | |
206 | module_platform_driver(da850_pupd_driver); | |
207 | ||
208 | MODULE_AUTHOR("David Lechner <david@lechnology.com>"); | |
209 | MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration"); | |
210 | MODULE_LICENSE("GPL"); |