u-boot/drivers/pinctrl/rockchip/pinctrl-rk3368.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2019 Rockchip Electronics Co., Ltd
 */

#include <common.h>
#include <dm.h>
#include <log.h>
#include <dm/pinctrl.h>
#include <regmap.h>
#include <syscon.h>

#include "pinctrl-rockchip.h"

static int rk3368_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
{
	struct rockchip_pinctrl_priv *priv = bank->priv;
	int iomux_num = (pin / 8);
	struct regmap *regmap;
	int reg, ret, mask, mux_type;
	u8 bit;
	u32 data;

	regmap = (bank->iomux[iomux_num].type & IOMUX_SOURCE_PMU)
				? priv->regmap_pmu : priv->regmap_base;

	/* get basic quadrupel of mux registers and the correct reg inside */
	mux_type = bank->iomux[iomux_num].type;
	reg = bank->iomux[iomux_num].offset;
	reg += rockchip_get_mux_data(mux_type, pin, &bit, &mask);

	data = (mask << (bit + 16));
	data |= (mux & mask) << bit;
	ret = regmap_write(regmap, reg, data);

	return ret;
}

#define RK3368_PULL_GRF_OFFSET		0x100
#define RK3368_PULL_PMU_OFFSET		0x10

static void rk3368_calc_pull_reg_and_bit(struct rockchip_pin_bank *bank,
					 int pin_num, struct regmap **regmap,
					 int *reg, u8 *bit)
{
	struct rockchip_pinctrl_priv *priv = bank->priv;

	/* The first 32 pins of the first bank are located in PMU */
	if (bank->bank_num == 0) {
		*regmap = priv->regmap_pmu;
		*reg = RK3368_PULL_PMU_OFFSET;
	} else {
		*regmap = priv->regmap_base;
		*reg = RK3368_PULL_GRF_OFFSET;

		/* correct the offset, as we're starting with the 2nd bank */
		*reg -= 0x10;
		*reg += bank->bank_num * ROCKCHIP_PULL_BANK_STRIDE;
	}

	*reg += ((pin_num / ROCKCHIP_PULL_PINS_PER_REG) * 4);

	*bit = (pin_num % ROCKCHIP_PULL_PINS_PER_REG);
	*bit *= ROCKCHIP_PULL_BITS_PER_PIN;
}

static int rk3368_set_pull(struct rockchip_pin_bank *bank,
			   int pin_num, int pull)
{
	struct regmap *regmap;
	int reg, ret;
	u8 bit, type;
	u32 data;

	if (pull == PIN_CONFIG_BIAS_PULL_PIN_DEFAULT)
		return -ENOTSUPP;

	rk3368_calc_pull_reg_and_bit(bank, pin_num, &regmap, &reg, &bit);
	type = bank->pull_type[pin_num / 8];
	ret = rockchip_translate_pull_value(type, pull);
	if (ret < 0) {
		debug("unsupported pull setting %d\n", pull);
		return ret;
	}

	/* enable the write to the equivalent lower bits */
	data = ((1 << ROCKCHIP_PULL_BITS_PER_PIN) - 1) << (bit + 16);
	data |= (ret << bit);
	ret = regmap_write(regmap, reg, data);

	return ret;
}

#define RK3368_DRV_PMU_OFFSET		0x20
#define RK3368_DRV_GRF_OFFSET		0x200

static void rk3368_calc_drv_reg_and_bit(struct rockchip_pin_bank *bank,
					int pin_num, struct regmap **regmap,
					int *reg, u8 *bit)
{
	struct rockchip_pinctrl_priv *priv = bank->priv;

	/* The first 32 pins of the first bank are located in PMU */
	if (bank->bank_num == 0) {
		*regmap = priv->regmap_pmu;
		*reg = RK3368_DRV_PMU_OFFSET;
	} else {
		*regmap = priv->regmap_base;
		*reg = RK3368_DRV_GRF_OFFSET;

		/* correct the offset, as we're starting with the 2nd bank */
		*reg -= 0x10;
		*reg += bank->bank_num * ROCKCHIP_DRV_BANK_STRIDE;
	}

	*reg += ((pin_num / ROCKCHIP_DRV_PINS_PER_REG) * 4);
	*bit = (pin_num % ROCKCHIP_DRV_PINS_PER_REG);
	*bit *= ROCKCHIP_DRV_BITS_PER_PIN;
}

static int rk3368_set_drive(struct rockchip_pin_bank *bank,
			    int pin_num, int strength)
{
	struct regmap *regmap;
	int reg, ret;
	u32 data;
	u8 bit;
	int type = bank->drv[pin_num / 8].drv_type;

	rk3368_calc_drv_reg_and_bit(bank, pin_num, &regmap, &reg, &bit);
	ret = rockchip_translate_drive_value(type, strength);
	if (ret < 0) {
		debug("unsupported driver strength %d\n", strength);
		return ret;
	}

	/* enable the write to the equivalent lower bits */
	data = ((1 << ROCKCHIP_DRV_BITS_PER_PIN) - 1) << (bit + 16);
	data |= (ret << bit);
	ret = regmap_write(regmap, reg, data);

	return ret;
}

static struct rockchip_pin_bank rk3368_pin_banks[] = {
	PIN_BANK_IOMUX_FLAGS(0, 32, "gpio0", IOMUX_SOURCE_PMU,
					     IOMUX_SOURCE_PMU,
					     IOMUX_SOURCE_PMU,
					     IOMUX_SOURCE_PMU
			    ),
	PIN_BANK(1, 32, "gpio1"),
	PIN_BANK(2, 32, "gpio2"),
	PIN_BANK(3, 32, "gpio3"),
};

static struct rockchip_pin_ctrl rk3368_pin_ctrl = {
	.pin_banks		= rk3368_pin_banks,
	.nr_banks		= ARRAY_SIZE(rk3368_pin_banks),
	.grf_mux_offset		= 0x0,
	.pmu_mux_offset		= 0x0,
	.set_mux		= rk3368_set_mux,
	.set_pull		= rk3368_set_pull,
	.set_drive		= rk3368_set_drive,
};

static const struct udevice_id rk3368_pinctrl_ids[] = {
	{
		.compatible = "rockchip,rk3368-pinctrl",
		.data = (ulong)&rk3368_pin_ctrl
	},
	{ }
};

U_BOOT_DRIVER(rockchip_rk3368_pinctrl) = {
	.name		= "rockchip_rk3368_pinctrl",
	.id		= UCLASS_PINCTRL,
	.of_match	= rk3368_pinctrl_ids,
	.priv_auto	= sizeof(struct rockchip_pinctrl_priv),
	.ops		= &rockchip_pinctrl_ops,
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
	.bind		= dm_scan_fdt_dev,
#endif
	.probe		= rockchip_pinctrl_probe,
};