[linux.git] / drivers / pinctrl / pinctrl-da850-pupd.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
 *
 * Copyright (C) 2016  David Lechner
 */

#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;

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

	data->base = devm_platform_ioremap_resource(pdev, 0);
	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 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,
};
module_platform_driver(da850_pupd_driver);

MODULE_AUTHOR("David Lechner <[email protected]>");
MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
MODULE_LICENSE("GPL");
Commit	Line	Data
8e8e69d6	1	// SPDX-License-Identifier: GPL-2.0-only
1ff91f0a DL	2	/*
	3	* Pinconf driver for TI DA850/OMAP-L138/AM18XX pullup/pulldown groups
	4	*
	5	* Copyright (C) 2016 David Lechner
1ff91f0a DL	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);
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
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;
1ff91f0a DL	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]);
1ff91f0a DL	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
	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;
1ff91f0a DL	149
	150	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	151	if (!data)
	152	return -ENOMEM;
	153
4b024225	154	data->base = devm_platform_ioremap_resource(pdev, 0);
1ff91f0a DL	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
1ff91f0a DL	176	static const struct of_device_id da850_pupd_of_match[] = {
	177	{ .compatible = "ti,da850-pupd" },
	178	{ }
	179	};
476e3e1d	180	MODULE_DEVICE_TABLE(of, da850_pupd_of_match);
1ff91f0a DL	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,
1ff91f0a DL	188	};
	189	module_platform_driver(da850_pupd_driver);
	190
	191	MODULE_AUTHOR("David Lechner <[email protected]>");
	192	MODULE_DESCRIPTION("TI DA850/OMAP-L138/AM18XX pullup/pulldown configuration");
	193	MODULE_LICENSE("GPL");