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Commit 1ff91f0a authored by David Lechner's avatar David Lechner Committed by Linus Walleij
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pinctrl: New driver for TI DA850/OMAP-L138/AM18XX pinconf 



This adds a new driver for pinconf on TI DA850/OMAP-L138/AM18XX. These
SoCs have a separate controller for controlling pullup/pulldown groups.

Signed-off-by: default avatarDavid Lechner <david@lechnology.com>
Reviewed-by: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 342030c7

drivers/pinctrl/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -93,6 +93,15 @@ config PINCTRL_AMD 
	  Requires ACPI/FDT device enumeration code to set up a platform

	  device.



config PINCTRL_DA850_PUPD

	tristate "TI DA850/OMAP-L138/AM18XX pullup/pulldown groups"

	depends on OF && (ARCH_DAVINCI_DA850 || COMPILE_TEST)

	select PINCONF

	select GENERIC_PINCONF

	help

	  Driver for TI DA850/OMAP-L138/AM18XX pinconf. Used to control

	  pullup/pulldown pin groups.



config PINCTRL_DIGICOLOR

	bool

	depends on OF && (ARCH_DIGICOLOR || COMPILE_TEST)

drivers/pinctrl/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-$(CONFIG_PINCTRL_BF60x) += pinctrl-adi2-bf60x.o 
obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o

obj-$(CONFIG_PINCTRL_AT91PIO4)	+= pinctrl-at91-pio4.o

obj-$(CONFIG_PINCTRL_AMD)	+= pinctrl-amd.o

obj-$(CONFIG_PINCTRL_DA850_PUPD) += pinctrl-da850-pupd.o

obj-$(CONFIG_PINCTRL_DIGICOLOR)	+= pinctrl-digicolor.o

obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o

obj-$(CONFIG_PINCTRL_MAX77620)	+= pinctrl-max77620.o

drivers/pinctrl/pinctrl-da850-pupd.c

0 → 100644
+210 −0
Original line number Diff line number Diff line 
/*

 * 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;

	u16 arg;

	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]);

		arg = pinconf_to_config_argument(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" },

	{ }

};



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");