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 | |
35 | static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev) |
36 | { |
37 | return ARRAY_SIZE(da850_pupd_group_names); |
38 | } |
39 | |
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 | |
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 | |
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: *config); |
70 | u32 val; |
71 | u16 arg; |
72 | |
73 | val = readl(addr: 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(addr: 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, argument: arg); |
96 | |
97 | return 0; |
98 | } |
99 | |
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(addr: data->base + DA850_PUPD_ENA); |
111 | sel = readl(addr: data->base + DA850_PUPD_SEL); |
112 | |
113 | for (i = 0; i < num_configs; i++) { |
114 | param = pinconf_to_config_param(config: 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(val: sel, addr: data->base + DA850_PUPD_SEL); |
134 | writel(val: ena, addr: 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 | |
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, size: sizeof(*data), GFP_KERNEL); |
151 | if (!data) |
152 | return -ENOMEM; |
153 | |
154 | data->base = devm_platform_ioremap_resource(pdev, index: 0); |
155 | if (IS_ERR(ptr: data->base)) { |
156 | dev_err(dev, "Could not map resource\n" ); |
157 | return PTR_ERR(ptr: 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, pctldesc: &data->desc, driver_data: data); |
166 | if (IS_ERR(ptr: data->pinctrl)) { |
167 | dev_err(dev, "Failed to register pinctrl\n" ); |
168 | return PTR_ERR(ptr: data->pinctrl); |
169 | } |
170 | |
171 | platform_set_drvdata(pdev, data); |
172 | |
173 | return 0; |
174 | } |
175 | |
176 | static const struct of_device_id da850_pupd_of_match[] = { |
177 | { .compatible = "ti,da850-pupd" }, |
178 | { } |
179 | }; |
180 | MODULE_DEVICE_TABLE(of, da850_pupd_of_match); |
181 | |
182 | static 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 | }; |
189 | module_platform_driver(da850_pupd_driver); |
190 | |
191 | MODULE_AUTHOR("David Lechner <david@lechnology.com>" ); |
192 | MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration" ); |
193 | MODULE_LICENSE("GPL" ); |
194 | |