pinctrl: New driver for TI DA850/OMAP-L138/AM18XX pinconf (1ff91f0a) · Commits · 戴 / test

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");

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