pinctrl-samsung.c 33.5 KB
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/*
 * pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 * Copyright (c) 2012 Linaro Ltd
 *		http://www.linaro.org
 *
 * Author: Thomas Abraham <thomas.ab@samsung.com>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This driver implements the Samsung pinctrl driver. It supports setting up of
 * pinmux and pinconf configurations. The gpiolib interface is also included.
 * External interrupt (gpio and wakeup) support are not included in this driver
 * but provides extensions to which platform specific implementation of the gpio
 * and wakeup interrupts can be hooked to.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/gpio.h>
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#include <linux/irqdomain.h>
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#include <linux/spinlock.h>
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#include <linux/syscore_ops.h>
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#include "../core.h"
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#include "pinctrl-samsung.h"

#define GROUP_SUFFIX		"-grp"
#define GSUFFIX_LEN		sizeof(GROUP_SUFFIX)
#define FUNCTION_SUFFIX		"-mux"
#define FSUFFIX_LEN		sizeof(FUNCTION_SUFFIX)

/* list of all possible config options supported */
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static struct pin_config {
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	const char *property;
	enum pincfg_type param;
} cfg_params[] = {
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	{ "samsung,pin-pud", PINCFG_TYPE_PUD },
	{ "samsung,pin-drv", PINCFG_TYPE_DRV },
	{ "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
	{ "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
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	{ "samsung,pin-val", PINCFG_TYPE_DAT },
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};

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/* Global list of devices (struct samsung_pinctrl_drv_data) */
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static LIST_HEAD(drvdata_list);
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static unsigned int pin_base;
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static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
{
	return container_of(gc, struct samsung_pin_bank, gpio_chip);
}

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static int samsung_get_group_count(struct pinctrl_dev *pctldev)
{
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	struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
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	return pmx->nr_groups;
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}

static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
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						unsigned group)
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{
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	struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
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	return pmx->pin_groups[group].name;
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}

static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
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					unsigned group,
					const unsigned **pins,
					unsigned *num_pins)
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{
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	struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);

	*pins = pmx->pin_groups[group].pins;
	*num_pins = pmx->pin_groups[group].num_pins;
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	return 0;
}

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static int reserve_map(struct device *dev, struct pinctrl_map **map,
		       unsigned *reserved_maps, unsigned *num_maps,
		       unsigned reserve)
{
	unsigned old_num = *reserved_maps;
	unsigned new_num = *num_maps + reserve;
	struct pinctrl_map *new_map;
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	if (old_num >= new_num)
		return 0;
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	new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
	if (!new_map) {
		dev_err(dev, "krealloc(map) failed\n");
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		return -ENOMEM;
	}

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	memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));

	*map = new_map;
	*reserved_maps = new_num;

	return 0;
}

static int add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
		       unsigned *num_maps, const char *group,
		       const char *function)
{
	if (WARN_ON(*num_maps == *reserved_maps))
		return -ENOSPC;

	(*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
	(*map)[*num_maps].data.mux.group = group;
	(*map)[*num_maps].data.mux.function = function;
	(*num_maps)++;

	return 0;
}

static int add_map_configs(struct device *dev, struct pinctrl_map **map,
			   unsigned *reserved_maps, unsigned *num_maps,
			   const char *group, unsigned long *configs,
			   unsigned num_configs)
{
	unsigned long *dup_configs;

	if (WARN_ON(*num_maps == *reserved_maps))
		return -ENOSPC;

	dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
			      GFP_KERNEL);
	if (!dup_configs) {
		dev_err(dev, "kmemdup(configs) failed\n");
		return -ENOMEM;
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	}

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	(*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
	(*map)[*num_maps].data.configs.group_or_pin = group;
	(*map)[*num_maps].data.configs.configs = dup_configs;
	(*map)[*num_maps].data.configs.num_configs = num_configs;
	(*num_maps)++;

	return 0;
}

static int add_config(struct device *dev, unsigned long **configs,
		      unsigned *num_configs, unsigned long config)
{
	unsigned old_num = *num_configs;
	unsigned new_num = old_num + 1;
	unsigned long *new_configs;

	new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
			       GFP_KERNEL);
	if (!new_configs) {
		dev_err(dev, "krealloc(configs) failed\n");
		return -ENOMEM;
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	}

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	new_configs[old_num] = config;

	*configs = new_configs;
	*num_configs = new_num;

	return 0;
}

static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
				      struct pinctrl_map *map,
				      unsigned num_maps)
{
	int i;

	for (i = 0; i < num_maps; i++)
		if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
			kfree(map[i].data.configs.configs);

	kfree(map);
}

static int samsung_dt_subnode_to_map(struct samsung_pinctrl_drv_data *drvdata,
				     struct device *dev,
				     struct device_node *np,
				     struct pinctrl_map **map,
				     unsigned *reserved_maps,
				     unsigned *num_maps)
{
	int ret, i;
	u32 val;
	unsigned long config;
	unsigned long *configs = NULL;
	unsigned num_configs = 0;
	unsigned reserve;
	struct property *prop;
	const char *group;
	bool has_func = false;

	ret = of_property_read_u32(np, "samsung,pin-function", &val);
	if (!ret)
		has_func = true;

	for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
		ret = of_property_read_u32(np, cfg_params[i].property, &val);
		if (!ret) {
			config = PINCFG_PACK(cfg_params[i].param, val);
			ret = add_config(dev, &configs, &num_configs, config);
			if (ret < 0)
				goto exit;
		/* EINVAL=missing, which is fine since it's optional */
		} else if (ret != -EINVAL) {
			dev_err(dev, "could not parse property %s\n",
				cfg_params[i].property);
		}
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	}

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	reserve = 0;
	if (has_func)
		reserve++;
	if (num_configs)
		reserve++;
	ret = of_property_count_strings(np, "samsung,pins");
	if (ret < 0) {
		dev_err(dev, "could not parse property samsung,pins\n");
		goto exit;
	}
	reserve *= ret;

	ret = reserve_map(dev, map, reserved_maps, num_maps, reserve);
	if (ret < 0)
		goto exit;

	of_property_for_each_string(np, "samsung,pins", prop, group) {
		if (has_func) {
			ret = add_map_mux(map, reserved_maps,
						num_maps, group, np->full_name);
			if (ret < 0)
				goto exit;
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		}

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		if (num_configs) {
			ret = add_map_configs(dev, map, reserved_maps,
					      num_maps, group, configs,
					      num_configs);
			if (ret < 0)
				goto exit;
		}
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	}

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	ret = 0;
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exit:
	kfree(configs);
	return ret;
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}

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static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
					struct device_node *np_config,
					struct pinctrl_map **map,
					unsigned *num_maps)
{
	struct samsung_pinctrl_drv_data *drvdata;
	unsigned reserved_maps;
	struct device_node *np;
	int ret;

	drvdata = pinctrl_dev_get_drvdata(pctldev);

	reserved_maps = 0;
	*map = NULL;
	*num_maps = 0;

	if (!of_get_child_count(np_config))
		return samsung_dt_subnode_to_map(drvdata, pctldev->dev,
							np_config, map,
							&reserved_maps,
							num_maps);

	for_each_child_of_node(np_config, np) {
		ret = samsung_dt_subnode_to_map(drvdata, pctldev->dev, np, map,
						&reserved_maps, num_maps);
		if (ret < 0) {
			samsung_dt_free_map(pctldev, *map, *num_maps);
			return ret;
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		}
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	}
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	return 0;
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}

/* list of pinctrl callbacks for the pinctrl core */
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static const struct pinctrl_ops samsung_pctrl_ops = {
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	.get_groups_count	= samsung_get_group_count,
	.get_group_name		= samsung_get_group_name,
	.get_group_pins		= samsung_get_group_pins,
	.dt_node_to_map		= samsung_dt_node_to_map,
	.dt_free_map		= samsung_dt_free_map,
};

/* check if the selector is a valid pin function selector */
static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
{
	struct samsung_pinctrl_drv_data *drvdata;

	drvdata = pinctrl_dev_get_drvdata(pctldev);
	return drvdata->nr_functions;
}

/* return the name of the pin function specified */
static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
						unsigned selector)
{
	struct samsung_pinctrl_drv_data *drvdata;

	drvdata = pinctrl_dev_get_drvdata(pctldev);
	return drvdata->pmx_functions[selector].name;
}

/* return the groups associated for the specified function selector */
static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
		unsigned selector, const char * const **groups,
		unsigned * const num_groups)
{
	struct samsung_pinctrl_drv_data *drvdata;

	drvdata = pinctrl_dev_get_drvdata(pctldev);
	*groups = drvdata->pmx_functions[selector].groups;
	*num_groups = drvdata->pmx_functions[selector].num_groups;
	return 0;
}

/*
 * given a pin number that is local to a pin controller, find out the pin bank
 * and the register base of the pin bank.
 */
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static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
			unsigned pin, void __iomem **reg, u32 *offset,
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			struct samsung_pin_bank **bank)
{
	struct samsung_pin_bank *b;

	b = drvdata->ctrl->pin_banks;

	while ((pin >= b->pin_base) &&
			((b->pin_base + b->nr_pins - 1) < pin))
		b++;

	*reg = drvdata->virt_base + b->pctl_offset;
	*offset = pin - b->pin_base;
	if (bank)
		*bank = b;
}

/* enable or disable a pinmux function */
static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
					unsigned group, bool enable)
{
	struct samsung_pinctrl_drv_data *drvdata;
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	struct samsung_pin_bank_type *type;
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	struct samsung_pin_bank *bank;
	void __iomem *reg;
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	u32 mask, shift, data, pin_offset;
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	unsigned long flags;
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	const struct samsung_pmx_func *func;
	const struct samsung_pin_group *grp;
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	drvdata = pinctrl_dev_get_drvdata(pctldev);
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	func = &drvdata->pmx_functions[selector];
	grp = &drvdata->pin_groups[group];
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	pin_to_reg_bank(drvdata, grp->pins[0] - drvdata->ctrl->base,
			&reg, &pin_offset, &bank);
	type = bank->type;
	mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
	shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
	if (shift >= 32) {
		/* Some banks have two config registers */
		shift -= 32;
		reg += 4;
	}
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	spin_lock_irqsave(&bank->slock, flags);
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	data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
	data &= ~(mask << shift);
	if (enable)
		data |= func->val << shift;
	writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
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	spin_unlock_irqrestore(&bank->slock, flags);
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}

/* enable a specified pinmux by writing to registers */
static int samsung_pinmux_enable(struct pinctrl_dev *pctldev, unsigned selector,
					unsigned group)
{
	samsung_pinmux_setup(pctldev, selector, group, true);
	return 0;
}

/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
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static const struct pinmux_ops samsung_pinmux_ops = {
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	.get_functions_count	= samsung_get_functions_count,
	.get_function_name	= samsung_pinmux_get_fname,
	.get_function_groups	= samsung_pinmux_get_groups,
	.enable			= samsung_pinmux_enable,
};

/* set or get the pin config settings for a specified pin */
static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
				unsigned long *config, bool set)
{
	struct samsung_pinctrl_drv_data *drvdata;
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	struct samsung_pin_bank_type *type;
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	struct samsung_pin_bank *bank;
	void __iomem *reg_base;
	enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
	u32 data, width, pin_offset, mask, shift;
	u32 cfg_value, cfg_reg;
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	unsigned long flags;
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	drvdata = pinctrl_dev_get_drvdata(pctldev);
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	pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, &reg_base,
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					&pin_offset, &bank);
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	type = bank->type;
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	if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
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		return -EINVAL;

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	width = type->fld_width[cfg_type];
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	cfg_reg = type->reg_offset[cfg_type];
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	spin_lock_irqsave(&bank->slock, flags);

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	mask = (1 << width) - 1;
	shift = pin_offset * width;
	data = readl(reg_base + cfg_reg);

	if (set) {
		cfg_value = PINCFG_UNPACK_VALUE(*config);
		data &= ~(mask << shift);
		data |= (cfg_value << shift);
		writel(data, reg_base + cfg_reg);
	} else {
		data >>= shift;
		data &= mask;
		*config = PINCFG_PACK(cfg_type, data);
	}
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	spin_unlock_irqrestore(&bank->slock, flags);

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	return 0;
}

/* set the pin config settings for a specified pin */
static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
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				unsigned long *configs, unsigned num_configs)
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{
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	int i, ret;

	for (i = 0; i < num_configs; i++) {
		ret = samsung_pinconf_rw(pctldev, pin, &configs[i], true);
		if (ret < 0)
			return ret;
	} /* for each config */

	return 0;
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}

/* get the pin config settings for a specified pin */
static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
					unsigned long *config)
{
	return samsung_pinconf_rw(pctldev, pin, config, false);
}

/* set the pin config settings for a specified pin group */
static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
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			unsigned group, unsigned long *configs,
			unsigned num_configs)
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{
	struct samsung_pinctrl_drv_data *drvdata;
	const unsigned int *pins;
	unsigned int cnt;

	drvdata = pinctrl_dev_get_drvdata(pctldev);
	pins = drvdata->pin_groups[group].pins;

	for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
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		samsung_pinconf_set(pctldev, pins[cnt], configs, num_configs);
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	return 0;
}

/* get the pin config settings for a specified pin group */
static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
				unsigned int group, unsigned long *config)
{
	struct samsung_pinctrl_drv_data *drvdata;
	const unsigned int *pins;

	drvdata = pinctrl_dev_get_drvdata(pctldev);
	pins = drvdata->pin_groups[group].pins;
	samsung_pinconf_get(pctldev, pins[0], config);
	return 0;
}

/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
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static const struct pinconf_ops samsung_pinconf_ops = {
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	.pin_config_get		= samsung_pinconf_get,
	.pin_config_set		= samsung_pinconf_set,
	.pin_config_group_get	= samsung_pinconf_group_get,
	.pin_config_group_set	= samsung_pinconf_group_set,
};

/* gpiolib gpio_set callback function */
static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
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	struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
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	struct samsung_pin_bank_type *type = bank->type;
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	unsigned long flags;
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	void __iomem *reg;
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	u32 data;
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	reg = bank->drvdata->virt_base + bank->pctl_offset;
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	spin_lock_irqsave(&bank->slock, flags);

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	data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
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	data &= ~(1 << offset);
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	if (value)
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		data |= 1 << offset;
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	writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
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	spin_unlock_irqrestore(&bank->slock, flags);
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}

/* gpiolib gpio_get callback function */
static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	void __iomem *reg;
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	u32 data;
	struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
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	struct samsung_pin_bank_type *type = bank->type;
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	reg = bank->drvdata->virt_base + bank->pctl_offset;
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	data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
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	data >>= offset;
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	data &= 1;
	return data;
}

/*
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 * The calls to gpio_direction_output() and gpio_direction_input()
 * leads to this function call.
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 */
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static int samsung_gpio_set_direction(struct gpio_chip *gc,
					     unsigned offset, bool input)
{
	struct samsung_pin_bank_type *type;
	struct samsung_pin_bank *bank;
	struct samsung_pinctrl_drv_data *drvdata;
	void __iomem *reg;
	u32 data, mask, shift;
	unsigned long flags;

	bank = gc_to_pin_bank(gc);
	type = bank->type;
	drvdata = bank->drvdata;

	reg = drvdata->virt_base + bank->pctl_offset +
					type->reg_offset[PINCFG_TYPE_FUNC];

	mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
	shift = offset * type->fld_width[PINCFG_TYPE_FUNC];
	if (shift >= 32) {
		/* Some banks have two config registers */
		shift -= 32;
		reg += 4;
	}

	spin_lock_irqsave(&bank->slock, flags);

	data = readl(reg);
	data &= ~(mask << shift);
	if (!input)
		data |= FUNC_OUTPUT << shift;
	writel(data, reg);

	spin_unlock_irqrestore(&bank->slock, flags);

	return 0;
}

/* gpiolib gpio_direction_input callback function. */
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static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
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	return samsung_gpio_set_direction(gc, offset, true);
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}

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/* gpiolib gpio_direction_output callback function. */
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static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
							int value)
{
	samsung_gpio_set(gc, offset, value);
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	return samsung_gpio_set_direction(gc, offset, false);
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}

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/*
 * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
 * and a virtual IRQ, if not already present.
 */
static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
	struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
	unsigned int virq;

	if (!bank->irq_domain)
		return -ENXIO;

	virq = irq_create_mapping(bank->irq_domain, offset);

	return (virq) ? : -ENXIO;
}

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static struct samsung_pin_group *samsung_pinctrl_create_groups(
				struct device *dev,
				struct samsung_pinctrl_drv_data *drvdata,
				unsigned int *cnt)
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{
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	struct pinctrl_desc *ctrldesc = &drvdata->pctl;
	struct samsung_pin_group *groups, *grp;
	const struct pinctrl_pin_desc *pdesc;
	int i;

	groups = devm_kzalloc(dev, ctrldesc->npins * sizeof(*groups),
				GFP_KERNEL);
	if (!groups)
		return ERR_PTR(-EINVAL);
	grp = groups;

	pdesc = ctrldesc->pins;
	for (i = 0; i < ctrldesc->npins; ++i, ++pdesc, ++grp) {
		grp->name = pdesc->name;
		grp->pins = &pdesc->number;
		grp->num_pins = 1;
	}

	*cnt = ctrldesc->npins;
	return groups;
}
663

664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
static int samsung_pinctrl_create_function(struct device *dev,
				struct samsung_pinctrl_drv_data *drvdata,
				struct device_node *func_np,
				struct samsung_pmx_func *func)
{
	int npins;
	int ret;
	int i;

	if (of_property_read_u32(func_np, "samsung,pin-function", &func->val))
		return 0;

	npins = of_property_count_strings(func_np, "samsung,pins");
	if (npins < 1) {
		dev_err(dev, "invalid pin list in %s node", func_np->name);
679 680 681
		return -EINVAL;
	}

682 683 684 685
	func->name = func_np->full_name;

	func->groups = devm_kzalloc(dev, npins * sizeof(char *), GFP_KERNEL);
	if (!func->groups)
686 687
		return -ENOMEM;

688 689 690 691 692 693 694 695 696 697
	for (i = 0; i < npins; ++i) {
		const char *gname;

		ret = of_property_read_string_index(func_np, "samsung,pins",
							i, &gname);
		if (ret) {
			dev_err(dev,
				"failed to read pin name %d from %s node\n",
				i, func_np->name);
			return ret;
698
		}
699 700

		func->groups[i] = gname;
701 702
	}

703 704
	func->num_groups = npins;
	return 1;
705 706
}

707 708 709 710
static struct samsung_pmx_func *samsung_pinctrl_create_functions(
				struct device *dev,
				struct samsung_pinctrl_drv_data *drvdata,
				unsigned int *cnt)
711
{
712
	struct samsung_pmx_func *functions, *func;
713 714
	struct device_node *dev_np = dev->of_node;
	struct device_node *cfg_np;
715
	unsigned int func_cnt = 0;
716 717
	int ret;

718 719 720 721 722 723
	/*
	 * Iterate over all the child nodes of the pin controller node
	 * and create pin groups and pin function lists.
	 */
	for_each_child_of_node(dev_np, cfg_np) {
		struct device_node *func_np;
724

725 726 727 728 729 730 731 732 733 734 735 736 737 738
		if (!of_get_child_count(cfg_np)) {
			if (!of_find_property(cfg_np,
			    "samsung,pin-function", NULL))
				continue;
			++func_cnt;
			continue;
		}

		for_each_child_of_node(cfg_np, func_np) {
			if (!of_find_property(func_np,
			    "samsung,pin-function", NULL))
				continue;
			++func_cnt;
		}
739 740
	}

741 742
	functions = devm_kzalloc(dev, func_cnt * sizeof(*functions),
					GFP_KERNEL);
743 744
	if (!functions) {
		dev_err(dev, "failed to allocate memory for function list\n");
745
		return ERR_PTR(-EINVAL);
746 747 748 749 750 751 752
	}
	func = functions;

	/*
	 * Iterate over all the child nodes of the pin controller node
	 * and create pin groups and pin function lists.
	 */
753
	func_cnt = 0;
754
	for_each_child_of_node(dev_np, cfg_np) {
755 756 757 758 759 760 761 762 763 764 765
		struct device_node *func_np;

		if (!of_get_child_count(cfg_np)) {
			ret = samsung_pinctrl_create_function(dev, drvdata,
							cfg_np, func);
			if (ret < 0)
				return ERR_PTR(ret);
			if (ret > 0) {
				++func;
				++func_cnt;
			}
766
			continue;
767
		}
768

769 770 771 772 773 774 775 776 777
		for_each_child_of_node(cfg_np, func_np) {
			ret = samsung_pinctrl_create_function(dev, drvdata,
						func_np, func);
			if (ret < 0)
				return ERR_PTR(ret);
			if (ret > 0) {
				++func;
				++func_cnt;
			}
778
		}
779
	}
780

781 782 783
	*cnt = func_cnt;
	return functions;
}
784

785 786 787 788 789
/*
 * Parse the information about all the available pin groups and pin functions
 * from device node of the pin-controller. A pin group is formed with all
 * the pins listed in the "samsung,pins" property.
 */
790

791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
				    struct samsung_pinctrl_drv_data *drvdata)
{
	struct device *dev = &pdev->dev;
	struct samsung_pin_group *groups;
	struct samsung_pmx_func *functions;
	unsigned int grp_cnt = 0, func_cnt = 0;

	groups = samsung_pinctrl_create_groups(dev, drvdata, &grp_cnt);
	if (IS_ERR(groups)) {
		dev_err(dev, "failed to parse pin groups\n");
		return PTR_ERR(groups);
	}

	functions = samsung_pinctrl_create_functions(dev, drvdata, &func_cnt);
	if (IS_ERR(functions)) {
		dev_err(dev, "failed to parse pin functions\n");
		return PTR_ERR(groups);
809 810 811 812 813
	}

	drvdata->pin_groups = groups;
	drvdata->nr_groups = grp_cnt;
	drvdata->pmx_functions = functions;
814
	drvdata->nr_functions = func_cnt;
815 816 817 818 819

	return 0;
}

/* register the pinctrl interface with the pinctrl subsystem */
820 821
static int samsung_pinctrl_register(struct platform_device *pdev,
				    struct samsung_pinctrl_drv_data *drvdata)
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
{
	struct pinctrl_desc *ctrldesc = &drvdata->pctl;
	struct pinctrl_pin_desc *pindesc, *pdesc;
	struct samsung_pin_bank *pin_bank;
	char *pin_names;
	int pin, bank, ret;

	ctrldesc->name = "samsung-pinctrl";
	ctrldesc->owner = THIS_MODULE;
	ctrldesc->pctlops = &samsung_pctrl_ops;
	ctrldesc->pmxops = &samsung_pinmux_ops;
	ctrldesc->confops = &samsung_pinconf_ops;

	pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
			drvdata->ctrl->nr_pins, GFP_KERNEL);
	if (!pindesc) {
		dev_err(&pdev->dev, "mem alloc for pin descriptors failed\n");
		return -ENOMEM;
	}
	ctrldesc->pins = pindesc;
	ctrldesc->npins = drvdata->ctrl->nr_pins;

	/* dynamically populate the pin number and pin name for pindesc */
	for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
		pdesc->number = pin + drvdata->ctrl->base;

	/*
	 * allocate space for storing the dynamically generated names for all
	 * the pins which belong to this pin-controller.
	 */
	pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
					drvdata->ctrl->nr_pins, GFP_KERNEL);
	if (!pin_names) {
		dev_err(&pdev->dev, "mem alloc for pin names failed\n");
		return -ENOMEM;
	}

	/* for each pin, the name of the pin is pin-bank name + pin number */
	for (bank = 0; bank < drvdata->ctrl->nr_banks; bank++) {
		pin_bank = &drvdata->ctrl->pin_banks[bank];
		for (pin = 0; pin < pin_bank->nr_pins; pin++) {
			sprintf(pin_names, "%s-%d", pin_bank->name, pin);
			pdesc = pindesc + pin_bank->pin_base + pin;
			pdesc->name = pin_names;
			pin_names += PIN_NAME_LENGTH;
		}
	}

870 871 872 873
	ret = samsung_pinctrl_parse_dt(pdev, drvdata);
	if (ret)
		return ret;

874 875 876 877 878 879
	drvdata->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, drvdata);
	if (!drvdata->pctl_dev) {
		dev_err(&pdev->dev, "could not register pinctrl driver\n");
		return -EINVAL;
	}

880 881 882 883
	for (bank = 0; bank < drvdata->ctrl->nr_banks; ++bank) {
		pin_bank = &drvdata->ctrl->pin_banks[bank];
		pin_bank->grange.name = pin_bank->name;
		pin_bank->grange.id = bank;
884 885
		pin_bank->grange.pin_base = drvdata->ctrl->base
						+ pin_bank->pin_base;
886 887 888 889 890
		pin_bank->grange.base = pin_bank->gpio_chip.base;
		pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
		pin_bank->grange.gc = &pin_bank->gpio_chip;
		pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
	}
891 892 893 894

	return 0;
}

895 896 897 898 899 900 901 902 903 904
static int samsung_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	return pinctrl_request_gpio(chip->base + offset);
}

static void samsung_gpio_free(struct gpio_chip *chip, unsigned offset)
{
	pinctrl_free_gpio(chip->base + offset);
}

905
static const struct gpio_chip samsung_gpiolib_chip = {
906 907
	.request = samsung_gpio_request,
	.free = samsung_gpio_free,
908 909 910 911
	.set = samsung_gpio_set,
	.get = samsung_gpio_get,
	.direction_input = samsung_gpio_direction_input,
	.direction_output = samsung_gpio_direction_output,
912
	.to_irq = samsung_gpio_to_irq,
913 914 915
	.owner = THIS_MODULE,
};

916
/* register the gpiolib interface with the gpiolib subsystem */
917 918
static int samsung_gpiolib_register(struct platform_device *pdev,
				    struct samsung_pinctrl_drv_data *drvdata)
919
{
920 921
	struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
	struct samsung_pin_bank *bank = ctrl->pin_banks;
922 923
	struct gpio_chip *gc;
	int ret;
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
	int i;

	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
		bank->gpio_chip = samsung_gpiolib_chip;

		gc = &bank->gpio_chip;
		gc->base = ctrl->base + bank->pin_base;
		gc->ngpio = bank->nr_pins;
		gc->dev = &pdev->dev;
		gc->of_node = bank->of_node;
		gc->label = bank->name;

		ret = gpiochip_add(gc);
		if (ret) {
			dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
							gc->label, ret);
			goto fail;
		}
942 943 944
	}

	return 0;
945 946 947 948 949 950 951

fail:
	for (--i, --bank; i >= 0; --i, --bank)
		if (gpiochip_remove(&bank->gpio_chip))
			dev_err(&pdev->dev, "gpio chip %s remove failed\n",
							bank->gpio_chip.label);
	return ret;
952 953 954
}

/* unregister the gpiolib interface with the gpiolib subsystem */
955 956
static int samsung_gpiolib_unregister(struct platform_device *pdev,
				      struct samsung_pinctrl_drv_data *drvdata)
957
{
958 959 960 961 962 963 964 965 966
	struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
	struct samsung_pin_bank *bank = ctrl->pin_banks;
	int ret = 0;
	int i;

	for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank)
		ret = gpiochip_remove(&bank->gpio_chip);

	if (ret)
967
		dev_err(&pdev->dev, "gpio chip remove failed\n");
968 969

	return ret;
970 971 972 973 974
}

static const struct of_device_id samsung_pinctrl_dt_match[];

/* retrieve the soc specific data */
975
static struct samsung_pin_ctrl *samsung_pinctrl_get_soc_data(
976
				struct samsung_pinctrl_drv_data *d,
977 978 979 980
				struct platform_device *pdev)
{
	int id;
	const struct of_device_id *match;
981
	struct device_node *node = pdev->dev.of_node;
982
	struct device_node *np;
983 984 985
	struct samsung_pin_ctrl *ctrl;
	struct samsung_pin_bank *bank;
	int i;
986

987
	id = of_alias_get_id(node, "pinctrl");
988 989 990 991 992
	if (id < 0) {
		dev_err(&pdev->dev, "failed to get alias id\n");
		return NULL;
	}
	match = of_match_node(samsung_pinctrl_dt_match, node);
993 994 995 996
	ctrl = (struct samsung_pin_ctrl *)match->data + id;

	bank = ctrl->pin_banks;
	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
997
		spin_lock_init(&bank->slock);
998
		bank->drvdata = d;
999 1000 1001 1002
		bank->pin_base = ctrl->nr_pins;
		ctrl->nr_pins += bank->nr_pins;
	}

1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
	for_each_child_of_node(node, np) {
		if (!of_find_property(np, "gpio-controller", NULL))
			continue;
		bank = ctrl->pin_banks;
		for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
			if (!strcmp(bank->name, np->name)) {
				bank->of_node = np;
				break;
			}
		}
	}

1015 1016 1017 1018
	ctrl->base = pin_base;
	pin_base += ctrl->nr_pins;

	return ctrl;
1019 1020
}

1021
static int samsung_pinctrl_probe(struct platform_device *pdev)
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
{
	struct samsung_pinctrl_drv_data *drvdata;
	struct device *dev = &pdev->dev;
	struct samsung_pin_ctrl *ctrl;
	struct resource *res;
	int ret;

	if (!dev->of_node) {
		dev_err(dev, "device tree node not found\n");
		return -ENODEV;
	}

	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata) {
		dev_err(dev, "failed to allocate memory for driver's "
				"private data\n");
		return -ENOMEM;
	}
1040 1041 1042 1043 1044 1045

	ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
	if (!ctrl) {
		dev_err(&pdev->dev, "driver data not available\n");
		return -EINVAL;
	}
1046 1047 1048 1049
	drvdata->ctrl = ctrl;
	drvdata->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1050 1051 1052
	drvdata->virt_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(drvdata->virt_base))
		return PTR_ERR(drvdata->virt_base);
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res)
		drvdata->irq = res->start;

	ret = samsung_gpiolib_register(pdev, drvdata);
	if (ret)
		return ret;

	ret = samsung_pinctrl_register(pdev, drvdata);
	if (ret) {
		samsung_gpiolib_unregister(pdev, drvdata);
		return ret;
	}

	if (ctrl->eint_gpio_init)
		ctrl->eint_gpio_init(drvdata);
	if (ctrl->eint_wkup_init)
		ctrl->eint_wkup_init(drvdata);

	platform_set_drvdata(pdev, drvdata);
1074 1075 1076 1077

	/* Add to the global list */
	list_add_tail(&drvdata->node, &drvdata_list);

1078 1079 1080
	return 0;
}

1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
#ifdef CONFIG_PM

/**
 * samsung_pinctrl_suspend_dev - save pinctrl state for suspend for a device
 *
 * Save data for all banks handled by this device.
 */
static void samsung_pinctrl_suspend_dev(
	struct samsung_pinctrl_drv_data *drvdata)
{
	struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
	void __iomem *virt_base = drvdata->virt_base;
	int i;

	for (i = 0; i < ctrl->nr_banks; i++) {
		struct samsung_pin_bank *bank = &ctrl->pin_banks[i];
		void __iomem *reg = virt_base + bank->pctl_offset;

		u8 *offs = bank->type->reg_offset;
		u8 *widths = bank->type->fld_width;
		enum pincfg_type type;

		/* Registers without a powerdown config aren't lost */
		if (!widths[PINCFG_TYPE_CON_PDN])
			continue;

		for (type = 0; type < PINCFG_TYPE_NUM; type++)
			if (widths[type])
				bank->pm_save[type] = readl(reg + offs[type]);

		if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
			/* Some banks have two config registers */
			bank->pm_save[PINCFG_TYPE_NUM] =
				readl(reg + offs[PINCFG_TYPE_FUNC] + 4);
			pr_debug("Save %s @ %p (con %#010x %08x)\n",
				 bank->name, reg,
				 bank->pm_save[PINCFG_TYPE_FUNC],
				 bank->pm_save[PINCFG_TYPE_NUM]);
		} else {
			pr_debug("Save %s @ %p (con %#010x)\n", bank->name,
				 reg, bank->pm_save[PINCFG_TYPE_FUNC]);
		}
	}
1124 1125 1126

	if (ctrl->suspend)
		ctrl->suspend(drvdata);
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
}

/**
 * samsung_pinctrl_resume_dev - restore pinctrl state from suspend for a device
 *
 * Restore one of the banks that was saved during suspend.
 *
 * We don't bother doing anything complicated to avoid glitching lines since
 * we're called before pad retention is turned off.
 */
static void samsung_pinctrl_resume_dev(struct samsung_pinctrl_drv_data *drvdata)
{
	struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
	void __iomem *virt_base = drvdata->virt_base;
	int i;

1143 1144 1145
	if (ctrl->resume)
		ctrl->resume(drvdata);

1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
	for (i = 0; i < ctrl->nr_banks; i++) {
		struct samsung_pin_bank *bank = &ctrl->pin_banks[i];
		void __iomem *reg = virt_base + bank->pctl_offset;

		u8 *offs = bank->type->reg_offset;
		u8 *widths = bank->type->fld_width;
		enum pincfg_type type;

		/* Registers without a powerdown config aren't lost */
		if (!widths[PINCFG_TYPE_CON_PDN])
			continue;

		if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
			/* Some banks have two config registers */
			pr_debug("%s @ %p (con %#010x %08x => %#010x %08x)\n",
				 bank->name, reg,
				 readl(reg + offs[PINCFG_TYPE_FUNC]),
				 readl(reg + offs[PINCFG_TYPE_FUNC] + 4),
				 bank->pm_save[PINCFG_TYPE_FUNC],
				 bank->pm_save[PINCFG_TYPE_NUM]);
			writel(bank->pm_save[PINCFG_TYPE_NUM],
			       reg + offs[PINCFG_TYPE_FUNC] + 4);
		} else {
			pr_debug("%s @ %p (con %#010x => %#010x)\n", bank->name,
				 reg, readl(reg + offs[PINCFG_TYPE_FUNC]),
				 bank->pm_save[PINCFG_TYPE_FUNC]);
		}
		for (type = 0; type < PINCFG_TYPE_NUM; type++)
			if (widths[type])
				writel(bank->pm_save[type], reg + offs[type]);
	}
}

/**
 * samsung_pinctrl_suspend - save pinctrl state for suspend
 *
 * Save data for all banks across all devices.
 */
static int samsung_pinctrl_suspend(void)
{
	struct samsung_pinctrl_drv_data *drvdata;

	list_for_each_entry(drvdata, &drvdata_list, node) {
		samsung_pinctrl_suspend_dev(drvdata);
	}

	return 0;
}

/**
 * samsung_pinctrl_resume - restore pinctrl state for suspend
 *
 * Restore data for all banks across all devices.
 */
static void samsung_pinctrl_resume(void)
{
	struct samsung_pinctrl_drv_data *drvdata;

	list_for_each_entry_reverse(drvdata, &drvdata_list, node) {
		samsung_pinctrl_resume_dev(drvdata);
	}
}

#else
#define samsung_pinctrl_suspend		NULL
#define samsung_pinctrl_resume		NULL
#endif

static struct syscore_ops samsung_pinctrl_syscore_ops = {
	.suspend	= samsung_pinctrl_suspend,
	.resume		= samsung_pinctrl_resume,
};

1219
static const struct of_device_id samsung_pinctrl_dt_match[] = {
1220
#ifdef CONFIG_PINCTRL_EXYNOS
1221 1222
	{ .compatible = "samsung,exynos3250-pinctrl",
		.data = (void *)exynos3250_pin_ctrl },
1223
	{ .compatible = "samsung,exynos4210-pinctrl",
1224
		.data = (void *)exynos4210_pin_ctrl },
1225
	{ .compatible = "samsung,exynos4x12-pinctrl",
1226
		.data = (void *)exynos4x12_pin_ctrl },
1227 1228
	{ .compatible = "samsung,exynos5250-pinctrl",
		.data = (void *)exynos5250_pin_ctrl },
1229 1230
	{ .compatible = "samsung,exynos5260-pinctrl",
		.data = (void *)exynos5260_pin_ctrl },
1231 1232
	{ .compatible = "samsung,exynos5420-pinctrl",
		.data = (void *)exynos5420_pin_ctrl },
1233 1234
	{ .compatible = "samsung,s5pv210-pinctrl",
		.data = (void *)s5pv210_pin_ctrl },
1235 1236 1237 1238
#endif
#ifdef CONFIG_PINCTRL_S3C64XX
	{ .compatible = "samsung,s3c64xx-pinctrl",
		.data = s3c64xx_pin_ctrl },
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#endif
#ifdef CONFIG_PINCTRL_S3C24XX
	{ .compatible = "samsung,s3c2412-pinctrl",
		.data = s3c2412_pin_ctrl },
	{ .compatible = "samsung,s3c2416-pinctrl",
		.data = s3c2416_pin_ctrl },
	{ .compatible = "samsung,s3c2440-pinctrl",
		.data = s3c2440_pin_ctrl },
	{ .compatible = "samsung,s3c2450-pinctrl",
		.data = s3c2450_pin_ctrl },
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#endif
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	{},
};
MODULE_DEVICE_TABLE(of, samsung_pinctrl_dt_match);

static struct platform_driver samsung_pinctrl_driver = {
	.probe		= samsung_pinctrl_probe,
	.driver = {
		.name	= "samsung-pinctrl",
		.owner	= THIS_MODULE,
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		.of_match_table = samsung_pinctrl_dt_match,
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	},
};

static int __init samsung_pinctrl_drv_register(void)
{
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	/*
	 * Register syscore ops for save/restore of registers across suspend.
	 * It's important to ensure that this driver is running at an earlier
	 * initcall level than any arch-specific init calls that install syscore
	 * ops that turn off pad retention (like exynos_pm_resume).
	 */
	register_syscore_ops(&samsung_pinctrl_syscore_ops);

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	return platform_driver_register(&samsung_pinctrl_driver);
}
postcore_initcall(samsung_pinctrl_drv_register);

static void __exit samsung_pinctrl_drv_unregister(void)
{
	platform_driver_unregister(&samsung_pinctrl_driver);
}
module_exit(samsung_pinctrl_drv_unregister);

MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
MODULE_DESCRIPTION("Samsung pinctrl driver");
MODULE_LICENSE("GPL v2");