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
22struct da850_pupd_data {
23	void __iomem *base;
24	struct pinctrl_desc desc;
25	struct pinctrl_dev *pinctrl;
26};
27
28static 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
35static int da850_pupd_get_groups_count(struct pinctrl_dev *pctldev)
36{
37	return ARRAY_SIZE(da850_pupd_group_names);
38}
39
40static 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
46static 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
56static 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
64static 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
100static 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
139static 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
145static 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
176static const struct of_device_id da850_pupd_of_match[] = {
177	{ .compatible = "ti,da850-pupd" },
178	{ }
179};
180MODULE_DEVICE_TABLE(of, da850_pupd_of_match);
181
182static 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};
189module_platform_driver(da850_pupd_driver);
190
191MODULE_AUTHOR("David Lechner <david@lechnology.com>");
192MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
193MODULE_LICENSE("GPL");
194