path: root/drivers/pinctrl/pinctrl-sunxi.c

/*
 * Allwinner A1X SoCs pinctrl driver.
 *
 * Copyright (C) 2012 Maxime Ripard
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/io.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "core.h"
#include "pinctrl-sunxi.h"
#include "pinctrl-sunxi-pins.h"

static struct sunxi_pinctrl_group *
sunxi_pinctrl_find_group_by_name(struct sunxi_pinctrl *pctl, const char *group)
{
	int i;

	for (i = 0; i < pctl->ngroups; i++) {
		struct sunxi_pinctrl_group *grp = pctl->groups + i;

		if (!strcmp(grp->name, group))
			return grp;
	}

	return NULL;
}

static struct sunxi_pinctrl_function *
sunxi_pinctrl_find_function_by_name(struct sunxi_pinctrl *pctl,
				    const char *name)
{
	struct sunxi_pinctrl_function *func = pctl->functions;
	int i;

	for (i = 0; i < pctl->nfunctions; i++) {
		if (!func[i].name)
			break;

		if (!strcmp(func[i].name, name))
			return func + i;
	}

	return NULL;
}

static struct sunxi_desc_function *
sunxi_pinctrl_desc_find_function_by_name(struct sunxi_pinctrl *pctl,
					 const char *pin_name,
					 const char *func_name)
{
	int i;

	for (i = 0; i < pctl->desc->npins; i++) {
		const struct sunxi_desc_pin *pin = pctl->desc->pins + i;

		if (!strcmp(pin->pin.name, pin_name)) {
			struct sunxi_desc_function *func = pin->functions;

			while (func->name) {
				if (!strcmp(func->name, func_name))
					return func;

				func++;
			}
		}
	}

	return NULL;
}

static struct sunxi_desc_function *
sunxi_pinctrl_desc_find_function_by_pin(struct sunxi_pinctrl *pctl,
					const u16 pin_num,
					const char *func_name)
{
	int i;

	for (i = 0; i < pctl->desc->npins; i++) {
		const struct sunxi_desc_pin *pin = pctl->desc->pins + i;

		if (pin->pin.number == pin_num) {
			struct sunxi_desc_function *func = pin->functions;

			while (func->name) {
				if (!strcmp(func->name, func_name))
					return func;

				func++;
			}
		}
	}

	return NULL;
}

static int sunxi_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return pctl->ngroups;
}

static const char *sunxi_pctrl_get_group_name(struct pinctrl_dev *pctldev,
					      unsigned group)
{
	struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return pctl->groups[group].name;
}

static int sunxi_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
				      unsigned group,
				      const unsigned **pins,
				      unsigned *num_pins)
{
	struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);

	*pins = (unsigned *)&pctl->groups[group].pin;
	*num_pins = 1;

	return 0;
}

static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
				      struct device_node *node,
				      struct pinctrl_map **map,
				      unsigned *num_maps)
{
	struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
	unsigned long *pinconfig;
	struct property *prop;
	const char *function;
	const char *group;
	int ret, nmaps, i = 0;
	u32 val;

	*map = NULL;
	*num_maps = 0;

	ret = of_property_read_string(node, "allwinner,function", &function);
	if (ret) {
		dev_err(pctl->dev,
			"missing allwinner,function property in node %s\n",
			node->name);
		return -EINVAL;
	}

	nmaps = of_property_count_strings(node, "allwinner,pins") * 2;
	if (nmaps < 0) {
		dev_err(pctl->dev,
			"missing allwinner,pins property in node %s\n",
			node->name);
		return -EINVAL;
	}

	*map