linux/drivers/pinctrl/meson/pinctrl-amlogic-a4.c

// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
/*
 * Copyright (c) 2024 Amlogic, Inc. All rights reserved.
 * Author: Xianwei Zhao <xianwei.zhao@amlogic.com>
 */

#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string_helpers.h>

#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <dt-bindings/pinctrl/amlogic,pinctrl.h>

#include "../core.h"
#include "../pinconf.h"

#define gpio_chip_to_bank(chip) \
		container_of(chip, struct aml_gpio_bank, gpio_chip)

#define AML_REG_PULLEN		0
#define AML_REG_PULL		1
#define AML_REG_DIR		2
#define AML_REG_OUT		3
#define AML_REG_IN		4
#define AML_REG_DS		5
#define AML_NUM_REG		6

enum aml_pinconf_drv {
	PINCONF_DRV_500UA,
	PINCONF_DRV_2500UA,
	PINCONF_DRV_3000UA,
	PINCONF_DRV_4000UA,
};

struct aml_pio_control {
	u32 gpio_offset;
	u32 reg_offset[AML_NUM_REG];
	u32 bit_offset[AML_NUM_REG];
};

/*
 * partial bank(subordinate) pins mux config use other bank(main) mux registgers
 * m_bank_id:	the main bank which pin_id from 0, but register bit not from bit 0
 * m_bit_offs:	bit offset the main bank mux register
 * sid:         start pin_id of subordinate bank
 * eid:         end pin_id of subordinate bank
 */
struct multi_mux {
	unsigned int m_bank_id;
	unsigned int m_bit_offs;
	unsigned int sid;
	unsigned int eid;
};

struct aml_pctl_data {
	unsigned int number;
	const struct multi_mux *p_mux;
};

struct aml_pmx_func {
	const char	*name;
	const char	**groups;
	unsigned int	ngroups;
};

struct aml_pctl_group {
	const char		*name;
	unsigned int		npins;
	unsigned int		*pins;
	unsigned int		*func;
};

struct aml_gpio_bank {
	struct gpio_chip		gpio_chip;
	struct aml_pio_control		pc;
	u32				bank_id;
	u32				mux_bit_offs;
	unsigned int			pin_base;
	struct regmap			*reg_mux;
	struct regmap			*reg_gpio;
	struct regmap			*reg_ds;
	const struct multi_mux		*p_mux;
};

struct aml_pinctrl {
	struct device			*dev;
	struct pinctrl_dev		*pctl;
	struct aml_gpio_bank		*banks;
	int				nbanks;
	struct aml_pmx_func		*functions;
	int				nfunctions;
	struct aml_pctl_group		*groups;
	int				ngroups;

	const struct aml_pctl_data	*data;
};

static const unsigned int aml_bit_strides[AML_NUM_REG] = {
	1, 1, 1, 1, 1, 2
};

static const unsigned int aml_def_regoffs[AML_NUM_REG] = {
	3, 4, 2, 1, 0, 7
};

static const char *aml_bank_name[31] = {
"GPIOA", "GPIOB", "GPIOC", "GPIOD", "GPIOE", "GPIOF", "GPIOG",
"GPIOH", "GPIOI", "GPIOJ", "GPIOK", "GPIOL", "GPIOM", "GPION",
"GPIOO", "GPIOP", "GPIOQ", "GPIOR", "GPIOS", "GPIOT", "GPIOU",
"GPIOV", "GPIOW", "GPIOX", "GPIOY", "GPIOZ", "GPIODV", "GPIOAO",
"GPIOCC", "TEST_N", "ANALOG"
};

static const struct multi_mux multi_mux_s7[] = {
	{
		.m_bank_id = AMLOGIC_GPIO_CC,
		.m_bit_offs = 24,
		.sid = (AMLOGIC_GPIO_X << 8) + 16,
		.eid = (AMLOGIC_GPIO_X << 8) + 19,
	},
};

static const struct aml_pctl_data s7_priv_data = {
	.number = ARRAY_SIZE(multi_mux_s7),
	.p_mux = multi_mux_s7,
};

static const struct multi_mux multi_mux_s6[] = {
	{
		.m_bank_id = AMLOGIC_GPIO_CC,
		.m_bit_offs = 24,
		.sid = (AMLOGIC_GPIO_X << 8) + 16,
		.eid = (AMLOGIC_GPIO_X << 8) + 19,
	}, {
		.m_bank_id = AMLOGIC_GPIO_F,
		.m_bit_offs = 4,
		.sid = (AMLOGIC_GPIO_D << 8) + 6,
		.eid = (AMLOGIC_GPIO_D << 8) + 6,
	},
};

static const struct aml_pctl_data s6_priv_data = {
	.number = ARRAY_SIZE(multi_mux_s6),
	.p_mux = multi_mux_s6,
};

static int aml_pmx_calc_reg_and_offset(struct pinctrl_gpio_range *range,
				       unsigned int pin, unsigned int *reg,
				       unsigned int *offset)
{
	unsigned int shift;

	shift = ((pin - range->pin_base) << 2) + *offset;
	*reg = (shift / 32) * 4;
	*offset = shift % 32;

	return 0;
}

static int aml_pctl_set_function(struct aml_pinctrl *info,
				 struct pinctrl_gpio_range *range,
				 int pin_id, int func)
{
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int shift;
	int reg;
	int i;
	unsigned int offset = bank->mux_bit_offs;
	const struct multi_mux *p_mux;

	/* peculiar mux reg set */
	if (bank->p_mux) {
		p_mux = bank->p_mux;
		if (pin_id >= p_mux->sid && pin_id <= p_mux->eid) {
			bank = NULL;
			for (i = 0; i < info->nbanks; i++) {
				if (info->banks[i].bank_id == p_mux->m_bank_id) {
					bank = &info->banks[i];
						break;
				}
			}

			if (!bank || !bank->reg_mux)
				return -EINVAL;

			shift = (pin_id - p_mux->sid) << 2;
			reg = (shift / 32) * 4;
			offset = shift % 32;
			return regmap_update_bits(bank->reg_mux, reg,
					0xf << offset, (func & 0xf) << offset);
		}
	}

	/* normal mux reg set */
	if (!bank->reg_mux)
		return 0;

	aml_pmx_calc_reg_and_offset(range, pin_id, &reg, &offset);
	return regmap_update_bits(bank->reg_mux, reg,
			0xf << offset, (func & 0xf) << offset);
}

static int aml_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	return info->nfunctions;
}

static const char *aml_pmx_get_fname(struct pinctrl_dev *pctldev,
				     unsigned int selector)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	return info->functions[selector].name;
}

static int aml_pmx_get_groups(struct pinctrl_dev *pctldev,
			      unsigned int selector,
			      const char * const **grps,
			      unsigned * const ngrps)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	*grps = info->functions[selector].groups;
	*ngrps = info->functions[selector].ngroups;

	return 0;
}

static int aml_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned int fselector,
			   unsigned int group_id)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
	struct aml_pctl_group *group = &info->groups[group_id];
	struct pinctrl_gpio_range *range;
	int i;

	for (i = 0; i < group->npins; i++) {
		range =  pinctrl_find_gpio_range_from_pin(pctldev, group->pins[i]);
		aml_pctl_set_function(info, range, group->pins[i], group->func[i]);
	}

	return 0;
}

static int aml_pmx_request_gpio(struct pinctrl_dev *pctldev,
				struct pinctrl_gpio_range *range,
				unsigned int pin)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	return aml_pctl_set_function(info, range, pin, 0);
}

static const struct pinmux_ops aml_pmx_ops = {
	.set_mux		= aml_pmx_set_mux,
	.get_functions_count	= aml_pmx_get_funcs_count,
	.get_function_name	= aml_pmx_get_fname,
	.get_function_groups	= aml_pmx_get_groups,
	.gpio_request_enable	= aml_pmx_request_gpio,
};

static int aml_calc_reg_and_bit(struct pinctrl_gpio_range *range,
				unsigned int pin,
				unsigned int reg_type,
				unsigned int *reg, unsigned int *bit)
{
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);

	*bit = (pin - range->pin_base) * aml_bit_strides[reg_type]
		+ bank->pc.bit_offset[reg_type];
	*reg = (bank->pc.reg_offset[reg_type] + (*bit / 32)) * 4;
	*bit &= 0x1f;

	return 0;
}

static int aml_pinconf_get_pull(struct aml_pinctrl *info, unsigned int pin)
{
	struct pinctrl_gpio_range *range =
			 pinctrl_find_gpio_range_from_pin(info->pctl, pin);
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int reg, bit, val;
	int ret, conf;

	aml_calc_reg_and_bit(range, pin, AML_REG_PULLEN, &reg, &bit);

	ret = regmap_read(bank->reg_gpio, reg, &val);
	if (ret)
		return ret;

	if (!(val & BIT(bit))) {
		conf = PIN_CONFIG_BIAS_DISABLE;
	} else {
		aml_calc_reg_and_bit(range, pin, AML_REG_PULL, &reg, &bit);

		ret = regmap_read(bank->reg_gpio, reg, &val);
		if (ret)
			return ret;

		if (val & BIT(bit))
			conf = PIN_CONFIG_BIAS_PULL_UP;
		else
			conf = PIN_CONFIG_BIAS_PULL_DOWN;
	}

	return conf;
}

static int aml_pinconf_get_drive_strength(struct aml_pinctrl *info,
					  unsigned int pin,
					  u16 *drive_strength_ua)
{
	struct pinctrl_gpio_range *range =
			 pinctrl_find_gpio_range_from_pin(info->pctl, pin);
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int reg, bit;
	unsigned int val;
	int ret;

	if (!bank->reg_ds)
		return -EOPNOTSUPP;

	aml_calc_reg_and_bit(range, pin, AML_REG_DS, &reg, &bit);
	ret = regmap_read(bank->reg_ds, reg, &val);
	if (ret)
		return ret;

	switch ((val >> bit) & 0x3) {
	case PINCONF_DRV_500UA:
		*drive_strength_ua = 500;
		break;
	case PINCONF_DRV_2500UA:
		*drive_strength_ua = 2500;
		break;
	case PINCONF_DRV_3000UA:
		*drive_strength_ua = 3000;
		break;
	case PINCONF_DRV_4000UA:
		*drive_strength_ua = 4000;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int aml_pinconf_get_gpio_bit(struct aml_pinctrl *info,
				    unsigned int pin,
				    unsigned int reg_type)
{
	struct pinctrl_gpio_range *range =
			 pinctrl_find_gpio_range_from_pin(info->pctl, pin);
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int reg, bit, val;
	int ret;

	aml_calc_reg_and_bit(range, pin, reg_type, &reg, &bit);
	ret = regmap_read(bank->reg_gpio, reg, &val);
	if (ret)
		return ret;

	return BIT(bit) & val ? 1 : 0;
}

static int aml_pinconf_get_output(struct aml_pinctrl *info,
				  unsigned int pin)
{
	int ret = aml_pinconf_get_gpio_bit(info, pin, AML_REG_DIR);

	if (ret < 0)
		return ret;

	return !ret;
}

static int aml_pinconf_get_drive(struct aml_pinctrl *info,
				 unsigned int pin)
{
	return aml_pinconf_get_gpio_bit(info, pin, AML_REG_OUT);
}

static int aml_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin,
			   unsigned long *config)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pcdev);
	enum pin_config_param param = pinconf_to_config_param(*config);
	u16 arg;
	int ret;

	switch (param) {
	case PIN_CONFIG_BIAS_DISABLE:
	case PIN_CONFIG_BIAS_PULL_DOWN:
	case PIN_CONFIG_BIAS_PULL_UP:
		if (aml_pinconf_get_pull(info, pin) == param)
			arg = 1;
		else
			return -EINVAL;
		break;
	case PIN_CONFIG_DRIVE_STRENGTH_UA:
		ret = aml_pinconf_get_drive_strength(info, pin, &arg);
		if (ret)
			return ret;
		break;
	case PIN_CONFIG_OUTPUT_ENABLE:
		ret = aml_pinconf_get_output(info, pin);
		if (ret <= 0)
			return -EINVAL;
		arg = 1;
		break;
	case PIN_CONFIG_OUTPUT:
		ret = aml_pinconf_get_output(info, pin);
		if (ret <= 0)
			return -EINVAL;

		ret = aml_pinconf_get_drive(info, pin);
		if (ret < 0)
			return -EINVAL;

		arg = ret;
		break;

	default:
		return -ENOTSUPP;
	}

	*config = pinconf_to_config_packed(param, arg);
	dev_dbg(info->dev, "pinconf for pin %u is %lu\n", pin, *config);

	return 0;
}

static int aml_pinconf_disable_bias(struct aml_pinctrl *info,
				    unsigned int pin)
{
	struct pinctrl_gpio_range *range =
			 pinctrl_find_gpio_range_from_pin(info->pctl, pin);
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int reg, bit = 0;

	aml_calc_reg_and_bit(range, pin, AML_REG_PULLEN, &reg, &bit);

	return regmap_update_bits(bank->reg_gpio, reg, BIT(bit), 0);
}

static int aml_pinconf_enable_bias(struct aml_pinctrl *info, unsigned int pin,
				   bool pull_up)
{
	struct pinctrl_gpio_range *range =
			 pinctrl_find_gpio_range_from_pin(info->pctl, pin);
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int reg, bit, val = 0;
	int ret;

	aml_calc_reg_and_bit(range, pin, AML_REG_PULL, &reg, &bit);
	if (pull_up)
		val = BIT(bit);

	ret = regmap_update_bits(bank->reg_gpio, reg, BIT(bit), val);
	if (ret)
		return ret;

	aml_calc_reg_and_bit(range, pin, AML_REG_PULLEN, &reg, &bit);
	return regmap_update_bits(bank->reg_gpio, reg, BIT(bit), BIT(bit));
}

static int aml_pinconf_set_drive_strength(struct aml_pinctrl *info,
					  unsigned int pin,
					  u16 drive_strength_ua)
{
	struct pinctrl_gpio_range *range =
			 pinctrl_find_gpio_range_from_pin(info->pctl, pin);
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int reg, bit, ds_val;

	if (!bank->reg_ds) {
		dev_err(info->dev, "drive-strength not supported\n");
		return -EOPNOTSUPP;
	}

	aml_calc_reg_and_bit(range, pin, AML_REG_DS, &reg, &bit);

	if (drive_strength_ua <= 500) {
		ds_val = PINCONF_DRV_500UA;
	} else if (drive_strength_ua <= 2500) {
		ds_val = PINCONF_DRV_2500UA;
	} else if (drive_strength_ua <= 3000) {
		ds_val = PINCONF_DRV_3000UA;
	} else if (drive_strength_ua <= 4000) {
		ds_val = PINCONF_DRV_4000UA;
	} else {
		dev_warn_once(info->dev,
			      "pin %u: invalid drive-strength : %d , default to 4mA\n",
			      pin, drive_strength_ua);
		ds_val = PINCONF_DRV_4000UA;
	}

	return regmap_update_bits(bank->reg_ds, reg, 0x3 << bit, ds_val << bit);
}

static int aml_pinconf_set_gpio_bit(struct aml_pinctrl *info,
				    unsigned int pin,
				    unsigned int reg_type,
				    bool arg)
{
	struct pinctrl_gpio_range *range =
			 pinctrl_find_gpio_range_from_pin(info->pctl, pin);
	struct aml_gpio_bank *bank = gpio_chip_to_bank(range->gc);
	unsigned int reg, bit;

	aml_calc_reg_and_bit(range, pin, reg_type, &reg, &bit);
	return regmap_update_bits(bank->reg_gpio, reg, BIT(bit),
				  arg ? BIT(bit) : 0);
}

static int aml_pinconf_set_output(struct aml_pinctrl *info,
				  unsigned int pin,
				  bool out)
{
	return aml_pinconf_set_gpio_bit(info, pin, AML_REG_DIR, !out);
}

static int aml_pinconf_set_drive(struct aml_pinctrl *info,
				 unsigned int pin,
				 bool high)
{
	return aml_pinconf_set_gpio_bit(info, pin, AML_REG_OUT, high);
}

static int aml_pinconf_set_output_drive(struct aml_pinctrl *info,
					unsigned int pin,
					bool high)
{
	int ret;

	ret = aml_pinconf_set_output(info, pin, true);
	if (ret)
		return ret;

	return aml_pinconf_set_drive(info, pin, high);
}

static int aml_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
			   unsigned long *configs, unsigned int num_configs)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pcdev);
	enum pin_config_param param;
	unsigned int arg = 0;
	int i, ret;

	for (i = 0; i < num_configs; i++) {
		param = pinconf_to_config_param(configs[i]);

		switch (param) {
		case PIN_CONFIG_DRIVE_STRENGTH_UA:
		case PIN_CONFIG_OUTPUT_ENABLE:
		case PIN_CONFIG_OUTPUT:
			arg = pinconf_to_config_argument(configs[i]);
			break;

		default:
			break;
		}

		switch (param) {
		case PIN_CONFIG_BIAS_DISABLE:
			ret = aml_pinconf_disable_bias(info, pin);
			break;
		case PIN_CONFIG_BIAS_PULL_UP:
			ret = aml_pinconf_enable_bias(info, pin, true);
			break;
		case PIN_CONFIG_BIAS_PULL_DOWN:
			ret = aml_pinconf_enable_bias(info, pin, false);
			break;
		case PIN_CONFIG_DRIVE_STRENGTH_UA:
			ret = aml_pinconf_set_drive_strength(info, pin, arg);
			break;
		case PIN_CONFIG_OUTPUT_ENABLE:
			ret = aml_pinconf_set_output(info, pin, arg);
			break;
		case PIN_CONFIG_OUTPUT:
			ret = aml_pinconf_set_output_drive(info, pin, arg);
			break;
		default:
			ret = -ENOTSUPP;
		}

		if (ret)
			return ret;
	}

	return 0;
}

static int aml_pinconf_group_set(struct pinctrl_dev *pcdev,
				 unsigned int num_group,
				 unsigned long *configs,
				 unsigned int num_configs)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pcdev);
	int i;

	for (i = 0; i < info->groups[num_group].npins; i++) {
		aml_pinconf_set(pcdev, info->groups[num_group].pins[i], configs,
				num_configs);
	}

	return 0;
}

static int aml_pinconf_group_get(struct pinctrl_dev *pcdev,
				 unsigned int group, unsigned long *config)
{
	return -EOPNOTSUPP;
}

static const struct pinconf_ops aml_pinconf_ops = {
	.pin_config_get		= aml_pinconf_get,
	.pin_config_set		= aml_pinconf_set,
	.pin_config_group_get	= aml_pinconf_group_get,
	.pin_config_group_set	= aml_pinconf_group_set,
	.is_generic		= true,
};

static int aml_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	return info->ngroups;
}

static const char *aml_get_group_name(struct pinctrl_dev *pctldev,
				      unsigned int selector)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	return info->groups[selector].name;
}

static int aml_get_group_pins(struct pinctrl_dev *pctldev,
			      unsigned int selector, const unsigned int **pins,
			      unsigned int *npins)
{
	struct aml_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	if (selector >= info->ngroups)
		return -EINVAL;

	*pins = info->groups[selector].pins;
	*npins = info->groups[selector].npins;

	return 0;
}

static void aml_pin_dbg_show(struct pinctrl_dev *pcdev, struct seq_file *s,
			     unsigned int offset)
{
	seq_printf(s, " %s", dev_name(pcdev->dev));
}

static const struct pinctrl_ops aml_pctrl_ops = {
	.get_groups_count	= aml_get_groups_count,
	.get_group_name		= aml_get_group_name,
	.get_group_pins		= aml_get_group_pins,
	.dt_node_to_map		= pinconf_generic_dt_node_to_map_pinmux,
	.dt_free_map		= pinconf_generic_dt_free_map,
	.pin_dbg_show		= aml_pin_dbg_show,
};

static int aml_pctl_parse_functions(struct device_node *np,
				    struct aml_pinctrl *info, u32 index,
				    int *grp_index)
{
	struct device *dev = info->dev;
	struct aml_pmx_func *func;
	struct aml_pctl_group *grp;
	int ret, i;

	func = &info->functions[index];
	func->name = np->name;
	func->ngroups = of_get_child_count(np);
	if (func->ngroups == 0)
		return dev_err_probe(dev, -EINVAL, "No groups defined\n");

	func->groups = devm_kcalloc(dev, func->ngroups, sizeof(*func->groups), GFP_KERNEL);
	if (!func->groups)
		return -ENOMEM;

	i = 0;
	for_each_child_of_node_scoped(np, child) {
		func->groups[i++] = child->name;
		grp = &info->groups[*grp_index];
		grp->name = child->name;
		*grp_index += 1;
		ret = pinconf_generic_parse_dt_pinmux(child, dev, &grp->pins,
						      &grp->func, &grp->npins);
		if (ret) {
			dev_err(dev, "function :%s, groups:%s fail\n", func->name, child->name);
			return ret;
		}
	}
	dev_dbg(dev, "Function[%d\t name:%s,\tgroups:%d]\n", index, func->name, func->ngroups);

	return 0;
}

static u32 aml_bank_pins(struct device_node *np)
{
	struct of_phandle_args of_args;

	if (of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
					     0, &of_args))
		return 0;
	else
		return of_args.args[2];
}

static int aml_bank_number(struct device_node *np)
{
	struct of_phandle_args of_args;

	if (of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
					     0, &of_args))
		return -EINVAL;
	else
		return of_args.args[1] >> 8;
}

static unsigned int aml_count_pins(struct device_node *np)
{
	struct device_node *child;
	unsigned int pins = 0;

	for_each_child_of_node(np, child) {
		if (of_property_read_bool(child, "gpio-controller"))
			pins += aml_bank_pins(child);
	}

	return pins;
}

/*
 * A pinctrl device contains two types of nodes. The one named GPIO
 * bank which includes gpio-controller property. The other one named
 * function which includes one or more pin groups. The pin group
 * include pinmux property(global index in pinctrl dev, and mux vlaue
 * in mux reg) and pin configuration properties.
 */
static void aml_pctl_dt_child_count(struct aml_pinctrl *info,
				    struct device_node *np)
{
	struct device_node *child;

	for_each_child_of_node(np, child) {
		if (of_property_read_bool(child, "gpio-controller")) {
			info->nbanks++;
		} else {
			info->nfunctions++;
			info->ngroups += of_get_child_count(child);
		}
	}
}

static struct regmap *aml_map_resource(struct device *dev, unsigned int id,
				       struct device_node *node, char *name)
{
	struct resource res;
	void __iomem *base;
	int i;

	struct regmap_config aml_regmap_config = {
		.reg_bits = 32,
		.val_bits = 32,
		.reg_stride = 4,
	};

	i = of_property_match_string(node, "reg-names", name);
	if (i < 0)
		return NULL;
	if (of_address_to_resource(node, i, &res))
		return NULL;
	base = devm_ioremap_resource(dev, &res);
	if (IS_ERR(base))
		return ERR_CAST(base);

	aml_regmap_config.max_register = resource_size(&res) - 4;
	aml_regmap_config.name = devm_kasprintf(dev, GFP_KERNEL,
						"%s-%s", aml_bank_name[id], name);
	if (!aml_regmap_config.name)
		return ERR_PTR(-ENOMEM);

	return devm_regmap_init_mmio(dev, base, &aml_regmap_config);
}

static inline int aml_gpio_calc_reg_and_bit(struct aml_gpio_bank *bank,
					    unsigned int reg_type,
					    unsigned int gpio,
					    unsigned int *reg,
					    unsigned int *bit)
{
	*bit = gpio * aml_bit_strides[reg_type] + bank->pc.bit_offset[reg_type];
	*reg = (bank->pc.reg_offset[reg_type] + (*bit / 32)) * 4;
	*bit &= 0x1f;

	return 0;
}

static int aml_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
{
	struct aml_gpio_bank *bank = gpiochip_get_data(chip);
	unsigned int bit, reg, val;
	int ret;

	aml_gpio_calc_reg_and_bit(bank, AML_REG_DIR, gpio, &reg, &bit);

	ret = regmap_read(bank->reg_gpio, reg, &val);
	if (ret)
		return ret;

	return BIT(bit) & val ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
}

static int aml_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio)
{
	struct aml_gpio_bank *bank = gpiochip_get_data(chip);
	unsigned int bit, reg;

	aml_gpio_calc_reg_and_bit(bank, AML_REG_DIR, gpio, &reg, &bit);

	return regmap_update_bits(bank->reg_gpio, reg, BIT(bit), BIT(bit));
}

static int aml_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio,
				     int value)
{
	struct aml_gpio_bank *bank = gpiochip_get_data(chip);
	unsigned int bit, reg;
	int ret;

	aml_gpio_calc_reg_and_bit(bank, AML_REG_DIR, gpio, &reg, &bit);
	ret = regmap_update_bits(bank->reg_gpio, reg, BIT(bit), 0);
	if (ret < 0)
		return ret;

	aml_gpio_calc_reg_and_bit(bank, AML_REG_OUT, gpio, &reg, &bit);

	return regmap_update_bits(bank->reg_gpio, reg, BIT(bit),
				  value ? BIT(bit) : 0);
}

static int aml_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
{
	struct aml_gpio_bank *bank = gpiochip_get_data(chip);
	unsigned int bit, reg;

	aml_gpio_calc_reg_and_bit(bank, AML_REG_OUT, gpio, &reg, &bit);

	return regmap_update_bits(bank->reg_gpio, reg, BIT(bit),
				  value ? BIT(bit) : 0);
}

static int aml_gpio_get(struct gpio_chip *chip, unsigned int gpio)
{
	struct aml_gpio_bank *bank = gpiochip_get_data(chip);
	unsigned int reg, bit, val;

	aml_gpio_calc_reg_and_bit(bank, AML_REG_IN, gpio, &reg, &bit);
	regmap_read(bank->reg_gpio, reg, &val);

	return !!(val & BIT(bit));
}

static const struct gpio_chip aml_gpio_template = {
	.request		= gpiochip_generic_request,
	.free			= gpiochip_generic_free,
	.set_config		= gpiochip_generic_config,
	.set_rv			= aml_gpio_set,
	.get			= aml_gpio_get,
	.direction_input	= aml_gpio_direction_input,
	.direction_output	= aml_gpio_direction_output,
	.get_direction		= aml_gpio_get_direction,
	.can_sleep		= false,
};

static void init_bank_register_bit(struct aml_pinctrl *info,
				   struct aml_gpio_bank *bank)
{
	const struct aml_pctl_data *data = info->data;
	const struct multi_mux *p_mux;
	int i;

	for (i = 0; i < AML_NUM_REG; i++) {
		bank->pc.reg_offset[i] = aml_def_regoffs[i];
		bank->pc.bit_offset[i] = 0;
	}

	bank->mux_bit_offs = 0;

	if (data) {
		for (i = 0; i < data->number; i++) {
			p_mux = &data->p_mux[i];
			if (bank->bank_id == p_mux->m_bank_id) {
				bank->mux_bit_offs = p_mux->m_bit_offs;
				break;
			}
			if (p_mux->sid >> 8 == bank->bank_id) {
				bank->p_mux = p_mux;
				break;
			}
		}
	}
}

static int aml_gpiolib_register_bank(struct aml_pinctrl *info,
				     int bank_nr, struct device_node *np)
{
	struct aml_gpio_bank *bank = &info->banks[bank_nr];
	struct device *dev = info->dev;
	int ret = 0;

	ret = aml_bank_number(np);
	if (ret < 0) {
		dev_err(dev, "get num=%d bank identity fail\n", bank_nr);
		return -EINVAL;
	}
	bank->bank_id = ret;

	bank->reg_mux = aml_map_resource(dev, bank->bank_id, np, "mux");
	if (IS_ERR_OR_NULL(bank->reg_mux)) {
		if (bank->bank_id == AMLOGIC_GPIO_TEST_N ||
		    bank->bank_id == AMLOGIC_GPIO_ANALOG)
			bank->reg_mux = NULL;
		else
			return dev_err_probe(dev, bank->reg_mux ? PTR_ERR(bank->reg_mux) : -ENOENT,
					     "mux registers not found\n");
	}

	bank->reg_gpio = aml_map_resource(dev, bank->bank_id, np, "gpio");
	if (IS_ERR_OR_NULL(bank->reg_gpio))
		return dev_err_probe(dev, bank->reg_gpio ? PTR_ERR(bank->reg_gpio) : -ENOENT,
				     "gpio registers not found\n");

	bank->reg_ds = aml_map_resource(dev, bank->bank_id, np, "ds");
	if (IS_ERR_OR_NULL(bank->reg_ds)) {
		dev_dbg(info->dev, "ds registers not found - skipping\n");
		bank->reg_ds = bank->reg_gpio;
	}

	bank->gpio_chip = aml_gpio_template;
	bank->gpio_chip.base = -1;
	bank->gpio_chip.ngpio = aml_bank_pins(np);
	bank->gpio_chip.fwnode = of_fwnode_handle(np);
	bank->gpio_chip.parent = dev;

	init_bank_register_bit(info, bank);
	bank->gpio_chip.label = aml_bank_name[bank->bank_id];

	bank->pin_base = bank->bank_id << 8;

	return 0;
}

static int aml_pctl_probe_dt(struct platform_device *pdev,
			     struct pinctrl_desc *pctl_desc,
			     struct aml_pinctrl *info)
{
	struct device *dev = &pdev->dev;
	struct pinctrl_pin_desc *pdesc;
	struct device_node *np = dev->of_node;
	int grp_index = 0;
	int i = 0, j = 0, k = 0, bank;
	int ret = 0;

	aml_pctl_dt_child_count(info, np);
	if (!info->nbanks)
		return dev_err_probe(dev, -EINVAL, "you need at least one gpio bank\n");

	dev_dbg(dev, "nbanks = %d\n", info->nbanks);
	dev_dbg(dev, "nfunctions = %d\n", info->nfunctions);
	dev_dbg(dev, "ngroups = %d\n", info->ngroups);

	info->functions = devm_kcalloc(dev, info->nfunctions, sizeof(*info->functions), GFP_KERNEL);

	info->groups = devm_kcalloc(dev, info->ngroups, sizeof(*info->groups), GFP_KERNEL);

	info->banks = devm_kcalloc(dev, info->nbanks, sizeof(*info->banks), GFP_KERNEL);

	if (!info->functions || !info->groups || !info->banks)
		return -ENOMEM;

	info->data = (struct aml_pctl_data *)of_device_get_match_data(dev);

	pctl_desc->npins = aml_count_pins(np);

	pdesc =	devm_kcalloc(dev, pctl_desc->npins, sizeof(*pdesc), GFP_KERNEL);
	if (!pdesc)
		return -ENOMEM;

	pctl_desc->pins = pdesc;

	bank = 0;
	for_each_child_of_node_scoped(np, child) {
		if (of_property_read_bool(child, "gpio-controller")) {
			const char *bank_name = NULL;
			char **pin_names;

			ret = aml_gpiolib_register_bank(info, bank, child);
			if (ret)
				return ret;

			k = info->banks[bank].pin_base;
			bank_name = info->banks[bank].gpio_chip.label;

			pin_names = devm_kasprintf_strarray(dev, bank_name,
							    info->banks[bank].gpio_chip.ngpio);
			if (IS_ERR(pin_names))
				return PTR_ERR(pin_names);

			for (j = 0; j < info->banks[bank].gpio_chip.ngpio; j++, k++) {
				pdesc->number = k;
				pdesc->name = pin_names[j];
				pdesc++;
			}
			bank++;
		} else {
			ret = aml_pctl_parse_functions(child, info,
						       i++, &grp_index);
			if (ret)
				return ret;
		}
	}

	return 0;
}

static int aml_pctl_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct aml_pinctrl *info;
	struct pinctrl_desc *pctl_desc;
	int ret, i;

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

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

	info->dev = dev;
	platform_set_drvdata(pdev, info);
	ret = aml_pctl_probe_dt(pdev, pctl_desc, info);
	if (ret)
		return ret;

	pctl_desc->owner	= THIS_MODULE;
	pctl_desc->pctlops	= &aml_pctrl_ops;
	pctl_desc->pmxops	= &aml_pmx_ops;
	pctl_desc->confops	= &aml_pinconf_ops;
	pctl_desc->name		= dev_name(dev);

	info->pctl = devm_pinctrl_register(dev, pctl_desc, info);
	if (IS_ERR(info->pctl))
		return dev_err_probe(dev, PTR_ERR(info->pctl), "Failed pinctrl registration\n");

	for (i = 0; i < info->nbanks; i++) {
		ret  = gpiochip_add_data(&info->banks[i].gpio_chip, &info->banks[i]);
		if (ret)
			return dev_err_probe(dev, ret, "Failed to add gpiochip(%d)!\n", i);
	}

	return 0;
}

static const struct of_device_id aml_pctl_of_match[] = {
	{ .compatible = "amlogic,pinctrl-a4", },
	{ .compatible = "amlogic,pinctrl-s7", .data = &s7_priv_data, },
	{ .compatible = "amlogic,pinctrl-s6", .data = &s6_priv_data, },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, aml_pctl_dt_match);

static struct platform_driver aml_pctl_driver = {
	.driver = {
		.name = "amlogic-pinctrl",
		.of_match_table = aml_pctl_of_match,
	},
	.probe = aml_pctl_probe,
};
module_platform_driver(aml_pctl_driver);

MODULE_AUTHOR("Xianwei Zhao <xianwei.zhao@amlogic.com>");
MODULE_DESCRIPTION("Pin controller and GPIO driver for Amlogic SoC");
MODULE_LICENSE("Dual BSD/GPL");