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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Spreadtrum pin controller driver
 * Copyright (C) 2017 Spreadtrum  - http://www.spreadtrum.com
 */

#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>

#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>

#include "../core.h"
#include "../pinmux.h"
#include "../pinconf.h"
#include "../pinctrl-utils.h"
#include "pinctrl-sprd.h"

#define PINCTRL_BIT_MASK(width)		(~(~0UL << (width)))
#define PINCTRL_REG_OFFSET		0x20
#define PINCTRL_REG_MISC_OFFSET		0x4020
#define PINCTRL_REG_LEN			0x4

#define PIN_FUNC_MASK			(BIT(4) | BIT(5))
#define PIN_FUNC_SEL_1			~PIN_FUNC_MASK
#define PIN_FUNC_SEL_2			BIT(4)
#define PIN_FUNC_SEL_3			BIT(5)
#define PIN_FUNC_SEL_4			PIN_FUNC_MASK

#define AP_SLEEP_MODE			BIT(13)
#define PUBCP_SLEEP_MODE		BIT(14)
#define TGLDSP_SLEEP_MODE		BIT(15)
#define AGDSP_SLEEP_MODE		BIT(16)
#define CM4_SLEEP_MODE			BIT(17)
#define SLEEP_MODE_MASK			GENMASK(5, 0)
#define SLEEP_MODE_SHIFT		13

#define SLEEP_INPUT			BIT(1)
#define SLEEP_INPUT_MASK		0x1
#define SLEEP_INPUT_SHIFT		1

#define SLEEP_OUTPUT			BIT(0)
#define SLEEP_OUTPUT_MASK		0x1
#define SLEEP_OUTPUT_SHIFT		0

#define DRIVE_STRENGTH_MASK		GENMASK(3, 0)
#define DRIVE_STRENGTH_SHIFT		19

#define SLEEP_PULL_DOWN			BIT(2)
#define SLEEP_PULL_DOWN_MASK		0x1
#define SLEEP_PULL_DOWN_SHIFT		2

#define PULL_DOWN			BIT(6)
#define PULL_DOWN_MASK			0x1
#define PULL_DOWN_SHIFT			6

#define SLEEP_PULL_UP			BIT(3)
#define SLEEP_PULL_UP_MASK		0x1
#define SLEEP_PULL_UP_SHIFT		3

#define PULL_UP_4_7K			(BIT(12) | BIT(7))
#define PULL_UP_20K			BIT(7)
#define PULL_UP_MASK			0x21
#define PULL_UP_SHIFT			7

#define INPUT_SCHMITT			BIT(11)
#define INPUT_SCHMITT_MASK		0x1
#define INPUT_SCHMITT_SHIFT		11

enum pin_sleep_mode {
	AP_SLEEP = BIT(0),
	PUBCP_SLEEP = BIT(1),
	TGLDSP_SLEEP = BIT(2),
	AGDSP_SLEEP = BIT(3),
	CM4_SLEEP = BIT(4),
};

enum pin_func_sel {
	PIN_FUNC_1,
	PIN_FUNC_2,
	PIN_FUNC_3,
	PIN_FUNC_4,
	PIN_FUNC_MAX,
};

/**
 * struct sprd_pin: represent one pin's description
 * @name: pin name
 * @number: pin number
 * @type: pin type, can be GLOBAL_CTRL_PIN/COMMON_PIN/MISC_PIN
 * @reg: pin register address
 * @bit_offset: bit offset in pin register
 * @bit_width: bit width in pin register
 */
struct sprd_pin {
	const char *name;
	unsigned int number;
	enum pin_type type;
	unsigned long reg;
	unsigned long bit_offset;
	unsigned long bit_width;
};

/**
 * struct sprd_pin_group: represent one group's description
 * @name: group name
 * @npins: pin numbers of this group
 * @pins: pointer to pins array
 */
struct sprd_pin_group {
	const char *name;
	unsigned int npins;
	unsigned int *pins;
};

/**
 * struct sprd_pinctrl_soc_info: represent the SoC's pins description
 * @groups: pointer to groups of pins
 * @ngroups: group numbers of the whole SoC
 * @pins: pointer to pins description
 * @npins: pin numbers of the whole SoC
 * @grp_names: pointer to group names array
 */
struct sprd_pinctrl_soc_info {
	struct sprd_pin_group *groups;
	unsigned int ngroups;
	struct sprd_pin *pins;
	unsigned int npins;
	const char **grp_names;
};

/**
 * struct sprd_pinctrl: represent the pin controller device
 * @dev: pointer to the device structure
 * @pctl: pointer to the pinctrl handle
 * @base: base address of the controller
 * @info: pointer to SoC's pins description information
 */
struct sprd_pinctrl {
	struct device *dev;
	struct pinctrl_dev *pctl;
	void __iomem *base;
	struct sprd_pinctrl_soc_info *info;
};

#define SPRD_PIN_CONFIG_CONTROL		(PIN_CONFIG_END + 1)
#define SPRD_PIN_CONFIG_SLEEP_MODE	(PIN_CONFIG_END + 2)

static int sprd_pinctrl_get_id_by_name(struct sprd_pinctrl *sprd_pctl,
				       const char *name)
{
	struct sprd_pinctrl_soc_info *info = sprd_pctl->info;
	int i;

	for (i = 0; i < info->npins; i++) {
		if (!strcmp(info->pins[i].name, name))
			return info->pins[i].number;
	}

	return -ENODEV;
}

static struct sprd_pin *
sprd_pinctrl_get_pin_by_id(struct sprd_pinctrl *sprd_pctl, unsigned int id)
{
	struct sprd_pinctrl_soc_info *info = sprd_pctl->info;
	struct sprd_pin *pin = NULL;
	int i;

	for (i = 0; i < info->npins; i++) {
		if (info->pins[i].number == id) {
			pin = &info->pins[i];
			break;
		}
	}

	return pin;
}

static const struct sprd_pin_group *
sprd_pinctrl_find_group_by_name(struct sprd_pinctrl *sprd_pctl,
				const char *name)
{
	struct sprd_pinctrl_soc_info *info = sprd_pctl->info;
	const struct sprd_pin_group *grp = NULL;
	int i;

	for (i = 0; i < info->ngroups; i++) {
		if (!strcmp(info->groups[i].name, name)) {
			grp = &info->groups[i];
			break;
		}
	}

	return grp;
}

static