summaryrefslogtreecommitdiffstats
path: root/drivers/pinctrl/pinctrl-da850-pupd.c
blob: f41d3d948dd8178d1b6b7074a4da734eb3484e2d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/*
 * Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
 *
 * Copyright (C) 2016  David Lechner
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/platform_device.h>

#define DA850_PUPD_ENA		0x00
#define DA850_PUPD_SEL		0x04

struct da850_pupd_data {
	void __iomem *base;
	struct pinctrl_desc desc;
	struct pinctrl_dev *pinctrl;
};

static const char * const da850_pupd_group_names[] = {
	"cp0", "cp1", "cp2", "cp3", "cp4", "cp5", "cp6", "cp7",
	"cp8", "cp9", "cp10", "cp11", "cp12", "cp13", "cp14", "cp15",
	"cp16", "cp17", "cp18", "cp19", "cp20", "cp21", "cp22", "cp23",
	"cp24", "cp25", "cp26", "cp27", "cp28", "cp29", "cp30", "cp31",
};

static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
{
	return ARRAY_SIZE(da850_pupd_group_names);
}

static const char *da850_pupd_get_group_name(struct pinctrl_dev *pctldev,
					     unsigned int selector)
{
	return da850_pupd_group_names[selector];
}

static int da850_pupd_get_group_pins(struct pinctrl_dev *pctldev,
				     unsigned int selector,
				     const unsigned int **pins,
				     unsigned int *num_pins)
{
	*num_pins = 0;

	return 0;
}

static const struct pinctrl_ops da850_pupd_pctlops = {
	.get_groups_count	= da850_pupd_get_groups_count,
	.get_group_name		= da850_pupd_get_group_name,
	.get_group_pins		= da850_pupd_get_group_pins,
	.dt_node_to_map		= pinconf_generic_dt_node_to_map_group,
	.dt_free_map		= pinconf_generic_dt_free_map,
};

static int da850_pupd_pin_config_group_get(struct pinctrl_dev *pctldev,
					   unsigned int selector,
					   unsigned long *config)
{
	struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
	enum pin_config_param param = pinconf_to_config_param(*config);
	u32 val;
	u16 arg;

	val = readl(data->base + DA850_PUPD_ENA);
	arg = !!(~val & BIT(selector));

	switch (param) {
	case PIN_CONFIG_BIAS_DISABLE:
		break;
	case PIN_CONFIG_BIAS_PULL_UP:
	case PIN_CONFIG_BIAS_PULL_DOWN:
		if (arg) {
			/* bias is disabled */
			arg = 0;
			break;
		}
		val = readl(data->base + DA850_PUPD_SEL);
		if (param == PIN_CONFIG_BIAS_PULL_DOWN)
			val = ~val;
		arg = !!(val & BIT(selector));
		break;
	default:
		return -EINVAL;
	}

	*config = pinconf_to_config_packed(param, arg);

	return 0;
}

static int da850_pupd_pin_config_group_set(struct pinctrl_dev *pctldev,
					   unsigned int selector,
					   unsigned long *configs,
					   unsigned int num_configs)
{
	struct da850_pupd_data *data = pinctrl_dev_get_drvdata(pctldev);
	u32 ena, sel;
	enum pin_config_param param;
	int i;

	ena = readl(data->base + DA850_PUPD_ENA);
	sel = readl(data->base + DA850_PUPD_SEL);

	for (i = 0; i < num_configs; i++) {
		param = pinconf_to_config_param(configs[i]);

		switch (param) {
		case PIN_CONFIG_BIAS_DISABLE:
			ena &= ~BIT(selector);
			break;
		case PIN_CONFIG_BIAS_PULL_UP:
			ena |= BIT(selector);
			sel |= BIT(selector);
			break;
		case PIN_CONFIG_BIAS_PULL_DOWN:
			ena |= BIT(selector);
			sel &= ~BIT(selector);
			break;
		default:
			return -EINVAL;
		}
	}

	writel(sel, data->base + DA850_PUPD_SEL);
	writel(ena, data->base + DA850_PUPD_ENA);

	return 0;
}

static const struct pinconf_ops da850_pupd_confops = {
	.is_generic		= true,
	.pin_config_group_get	= da850_pupd_pin_config_group_get,
	.pin_config_group_set	= da850_pupd_pin_config_group_set,
};

static int da850_pupd_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct da850_pupd_data *data;
	struct resource *res;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	data->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(data->base)) {
		dev_err(dev, "Could not map resource\n");
		return PTR_ERR(data->base);
	}

	data->desc.name = dev_name(dev);
	data->desc.pctlops = &da850_pupd_pctlops;
	data->desc.confops = &da850_pupd_confops;
	data->desc.owner = THIS_MODULE;

	data->pinctrl = devm_pinctrl_register(dev, &data->desc, data);
	if (IS_ERR(data->pinctrl)) {
		dev_err(dev, "Failed to register pinctrl\n");
		return PTR_ERR(data->pinctrl);
	}

	platform_set_drvdata(pdev, data);

	return 0;
}

static int da850_pupd_remove(struct platform_device *pdev)
{
	return 0;
}

static const struct of_device_id da850_pupd_of_match[] = {
	{ .compatible = "ti,da850-pupd" },
	{ }
};
MODULE_DEVICE_TABLE(of, da850_pupd_of_match);

static struct platform_driver da850_pupd_driver = {
	.driver	= {
		.name		= "ti-da850-pupd",
		.of_match_table	= da850_pupd_of_match,
	},
	.probe	= da850_pupd_probe,
	.remove	= da850_pupd_remove,
};
module_platform_driver(da850_pupd_driver);

MODULE_AUTHOR("David Lechner <david@lechnology.com>");
MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud