drivers/pinctrl/pinctrl-tegra-xusb.c

/*
 * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/reset.h>

#include <dt-bindings/pinctrl/pinctrl-tegra-xusb.h>

#include "core.h"
#include "pinctrl-utils.h"

#define XUSB_PADCTL_ELPG_PROGRAM 0x01c
#define XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_VCORE_DOWN (1 << 26)
#define XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN_EARLY (1 << 25)
#define XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN (1 << 24)

#define XUSB_PADCTL_IOPHY_PLL_P0_CTL1 0x040
#define XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL0_LOCKDET (1 << 19)
#define XUSB_PADCTL_IOPHY_PLL_P0_CTL1_REFCLK_SEL_MASK (0xf << 12)
#define XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL_RST (1 << 1)

#define XUSB_PADCTL_IOPHY_PLL_P0_CTL2 0x044
#define XUSB_PADCTL_IOPHY_PLL_P0_CTL2_REFCLKBUF_EN (1 << 6)
#define XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_EN (1 << 5)
#define XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_SEL (1 << 4)

#define XUSB_PADCTL_IOPHY_PLL_S0_CTL1 0x138
#define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_LOCKDET (1 << 27)
#define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_MODE (1 << 24)
#define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_PWR_OVRD (1 << 3)
#define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_RST (1 << 1)
#define XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_IDDQ (1 << 0)

#define XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1 0x148
#define XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ_OVRD (1 << 1)
#define XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ (1 << 0)

struct tegra_xusb_padctl_function {
	const char *name;
	const char * const *groups;
	unsigned int num_groups;
};

struct tegra_xusb_padctl_group {
	const unsigned int *funcs;
	unsigned int num_funcs;
};

struct tegra_xusb_padctl_soc {
	const struct pinctrl_pin_desc *pins;
	unsigned int num_pins;

	const struct tegra_xusb_padctl_function *functions;
	unsigned int num_functions;

	const struct tegra_xusb_padctl_lane *lanes;
	unsigned int num_lanes;
};

struct tegra_xusb_padctl_lane {
	const char *name;

	unsigned int offset;
	unsigned int shift;
	unsigned int mask;
	unsigned int iddq;

	const unsigned int *funcs;
	unsigned int num_funcs;
};

struct tegra_xusb_padctl {
	struct device *dev;
	void __iomem *regs;
	struct mutex lock;
	struct reset_control *rst;

	const struct tegra_xusb_padctl_soc *soc;
	struct pinctrl_dev *pinctrl;
	struct pinctrl_desc desc;

	struct phy_provider *provider;
	struct phy *phys[2];

	unsigned int enable;
};

static inline void padctl_writel(struct tegra_xusb_padctl *padctl, u32 value,
				 unsigned long offset)
{
	writel(value, padctl->regs + offset);
}

static inline u32 padctl_readl(struct tegra_xusb_padctl *padctl,
			       unsigned long offset)
{
	return readl(padctl->regs + offset);
}

static int tegra_xusb_padctl_get_groups_count(struct pinctrl_dev *pinctrl)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);

	return padctl->soc->num_pins;
}

static const char *tegra_xusb_padctl_get_group_name(struct pinctrl_dev *pinctrl,
						    unsigned int group)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);

	return padctl->soc->pins[group].name;
}

enum tegra_xusb_padctl_param {
	TEGRA_XUSB_PADCTL_IDDQ,
};

static const struct tegra_xusb_padctl_property {
	const char *name;
	enum tegra_xusb_padctl_param param;
} properties[] = {
	{ "nvidia,iddq", TEGRA_XUSB_PADCTL_IDDQ },
};

#define TEGRA_XUSB_PADCTL_PACK(param, value) ((param) << 16 | (value))
#define TEGRA_XUSB_PADCTL_UNPACK_PARAM(config) ((config) >> 16)
#define TEGRA_XUSB_PADCTL_UNPACK_VALUE(config) ((config) & 0xffff)

static int tegra_xusb_padctl_parse_subnode(struct tegra_xusb_padctl *padctl,
					   struct device_node *np,
					   struct pinctrl_map **maps,
					   unsigned int *reserved_maps,
					   unsigned int *num_maps)
{
	unsigned int i, reserve = 0, num_configs = 0;
	unsigned long config, *configs = NULL;
	const char *function, *group;
	struct property *prop;
	int err = 0;
	u32 value;

	err = of_property_read_string(np, "nvidia,function", &function);
	if (err < 0) {
		if (err != -EINVAL)
			return err;

		function = NULL;
	}

	for (i = 0; i < ARRAY_SIZE(properties); i++) {
		err = of_property_read_u32(np, properties[i].name, &value);
		if (err < 0) {
			if (err == -EINVAL)
				continue;

			return err;
		}

		config = TEGRA_XUSB_PADCTL_PACK(properties[i].param, value);

		err = pinctrl_utils_add_config(padctl->pinctrl, &configs,
					       &num_configs, config);
		if (err < 0)
			return err;
	}

	if (function)
		reserve++;

	if (num_configs)
		reserve++;

	err = of_property_count_strings(np, "nvidia,lanes");
	if (err < 0)
		return err;

	reserve *= err;

	err = pinctrl_utils_reserve_map(padctl->pinctrl, maps, reserved_maps,
					num_maps, reserve);
	if (err < 0)
		return err;

	of_property_for_each_string(np, "nvidia,lanes", prop, group) {
		if (function) {
			err = pinctrl_utils_add_map_mux(padctl->pinctrl, maps,
					reserved_maps, num_maps, group,
					function);
			if (err < 0)
				return err;
		}

		if (num_configs) {
			err = pinctrl_utils_add_map_configs(padctl->pinctrl,
					maps, reserved_maps, num_maps, group,
					configs, num_configs,
					PIN_MAP_TYPE_CONFIGS_GROUP);
			if (err < 0)
				return err;
		}
	}

	return 0;
}

static int tegra_xusb_padctl_dt_node_to_map(struct pinctrl_dev *pinctrl,
					    struct device_node *parent,
					    struct pinctrl_map **maps,
					    unsigned int *num_maps)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);
	unsigned int reserved_maps = 0;
	struct device_node *np;
	int err;

	*num_maps = 0;
	*maps = NULL;

	for_each_child_of_node(parent, np) {
		err = tegra_xusb_padctl_parse_subnode(padctl, np, maps,
						      &reserved_maps,
						      num_maps);
		if (err < 0)
			return err;
	}

	return 0;
}

static const struct pinctrl_ops tegra_xusb_padctl_pinctrl_ops = {
	.get_groups_count = tegra_xusb_padctl_get_groups_count,
	.get_group_name = tegra_xusb_padctl_get_group_name,
	.dt_node_to_map = tegra_xusb_padctl_dt_node_to_map,
	.dt_free_map = pinctrl_utils_dt_free_map,
};

static int tegra_xusb_padctl_get_functions_count(struct pinctrl_dev *pinctrl)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);

	return padctl->soc->num_functions;
}

static const char *
tegra_xusb_padctl_get_function_name(struct pinctrl_dev *pinctrl,
				    unsigned int function)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);

	return padctl->soc->functions[function].name;
}

static int tegra_xusb_padctl_get_function_groups(struct pinctrl_dev *pinctrl,
						 unsigned int function,
						 const char * const **groups,
						 unsigned * const num_groups)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);

	*num_groups = padctl->soc->functions[function].num_groups;
	*groups = padctl->soc->functions[function].groups;

	return 0;
}

static int tegra_xusb_padctl_pinmux_set(struct pinctrl_dev *pinctrl,
					unsigned int function,
					unsigned int group)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);
	const struct tegra_xusb_padctl_lane *lane;
	unsigned int i;
	u32 value;

	lane = &padctl->soc->lanes[group];

	for (i = 0; i < lane->num_funcs; i++)
		if (lane->funcs[i] == function)
			break;

	if (i >= lane->num_funcs)
		return -EINVAL;

	value = padctl_readl(padctl, lane->offset);
	value &= ~(lane->mask << lane->shift);
	value |= i << lane->shift;
	padctl_writel(padctl, value, lane->offset);

	return 0;
}

static const struct pinmux_ops tegra_xusb_padctl_pinmux_ops = {
	.get_functions_count = tegra_xusb_padctl_get_functions_count,
	.get_function_name = tegra_xusb_padctl_get_function_name,
	.get_function_groups = tegra_xusb_padctl_get_function_groups,
	.set_mux = tegra_xusb_padctl_pinmux_set,
};

static int tegra_xusb_padctl_pinconf_group_get(struct pinctrl_dev *pinctrl,
					       unsigned int group,
					       unsigned long *config)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);
	const struct tegra_xusb_padctl_lane *lane;
	enum tegra_xusb_padctl_param param;
	u32 value;

	param = TEGRA_XUSB_PADCTL_UNPACK_PARAM(*config);
	lane = &padctl->soc->lanes[group];

	switch (param) {
	case TEGRA_XUSB_PADCTL_IDDQ:
		/* lanes with iddq == 0 don't support this parameter */
		if (lane->iddq == 0)
			return -EINVAL;

		value = padctl_readl(padctl, lane->offset);

		if (value & BIT(lane->iddq))
			value = 0;
		else
			value = 1;

		*config = TEGRA_XUSB_PADCTL_PACK(param, value);
		break;

	default:
		dev_err(padctl->dev, "invalid configuration parameter: %04x\n",
			param);
		return -ENOTSUPP;
	}

	return 0;
}

static int tegra_xusb_padctl_pinconf_group_set(struct pinctrl_dev *pinctrl,
					       unsigned int group,
					       unsigned long *configs,
					       unsigned int num_configs)
{
	struct tegra_xusb_padctl *padctl = pinctrl_dev_get_drvdata(pinctrl);
	const struct tegra_xusb_padctl_lane *lane;
	enum tegra_xusb_padctl_param param;
	unsigned long value;
	unsigned int i;
	u32 regval;

	lane = &padctl->soc->lanes[group];

	for (i = 0; i < num_configs; i++) {
		param = TEGRA_XUSB_PADCTL_UNPACK_PARAM(configs[i]);
		value = TEGRA_XUSB_PADCTL_UNPACK_VALUE(configs[i]);

		switch (param) {
		case TEGRA_XUSB_PADCTL_IDDQ:
			/* lanes with iddq == 0 don't support this parameter */
			if (lane->iddq == 0)
				return -EINVAL;

			regval = padctl_readl(padctl, lane->offset);

			if (value)
				regval &= ~BIT(lane->iddq);
			else
				regval |= BIT(lane->iddq);

			padctl_writel(padctl, regval, lane->offset);
			break;

		default:
			dev_err(padctl->dev,
				"invalid configuration parameter: %04x\n",
				param);
			return -ENOTSUPP;
		}
	}

	return 0;
}

#ifdef CONFIG_DEBUG_FS
static const char *strip_prefix(const char *s)
{
	const char *comma = strchr(s, ',');
	if (!comma)
		return s;

	return comma + 1;
}

static void
tegra_xusb_padctl_pinconf_group_dbg_show(struct pinctrl_dev *pinctrl,
					 struct seq_file *s,
					 unsigned int group)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(properties); i++) {
		unsigned long config, value;
		int err;

		config = TEGRA_XUSB_PADCTL_PACK(properties[i].param, 0);

		err = tegra_xusb_padctl_pinconf_group_get(pinctrl, group,
							  &config);
		if (err < 0)
			continue;

		value = TEGRA_XUSB_PADCTL_UNPACK_VALUE(config);

		seq_printf(s, "\n\t%s=%lu\n", strip_prefix(properties[i].name),
			   value);
	}
}

static void
tegra_xusb_padctl_pinconf_config_dbg_show(struct pinctrl_dev *pinctrl,
					  struct seq_file *s,
					  unsigned long config)
{
	enum tegra_xusb_padctl_param param;
	const char *name = "unknown";
	unsigned long value;
	unsigned int i;

	param = TEGRA_XUSB_PADCTL_UNPACK_PARAM(config);
	value = TEGRA_XUSB_PADCTL_UNPACK_VALUE(config);

	for (i = 0; i < ARRAY_SIZE(properties); i++) {
		if (properties[i].param == param) {
			name = properties[i].name;
			break;
		}
	}

	seq_printf(s, "%s=%lu", strip_prefix(name), value);
}
#endif

static const struct pinconf_ops tegra_xusb_padctl_pinconf_ops = {
	.pin_config_group_get = tegra_xusb_padctl_pinconf_group_get,
	.pin_config_group_set = tegra_xusb_padctl_pinconf_group_set,
#ifdef CONFIG_DEBUG_FS
	.pin_config_group_dbg_show = tegra_xusb_padctl_pinconf_group_dbg_show,
	.pin_config_config_dbg_show = tegra_xusb_padctl_pinconf_config_dbg_show,
#endif
};

static int tegra_xusb_padctl_enable(struct tegra_xusb_padctl *padctl)
{
	u32 value;

	mutex_lock(&padctl->lock);

	if (padctl->enable++ > 0)
		goto out;

	value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
	value &= ~XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN;
	padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);

	usleep_range(100, 200);

	value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
	value &= ~XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN_EARLY;
	padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);

	usleep_range(100, 200);

	value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
	value &= ~XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_VCORE_DOWN;
	padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);

out:
	mutex_unlock(&padctl->lock);
	return 0;
}

static int tegra_xusb_padctl_disable(struct tegra_xusb_padctl *padctl)
{
	u32 value;

	mutex_lock(&padctl->lock);

	if (WARN_ON(padctl->enable == 0))
		goto out;

	if (--padctl->enable > 0)
		goto out;

	value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
	value |= XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_VCORE_DOWN;
	padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);

	usleep_range(100, 200);

	value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
	value |= XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN_EARLY;
	padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);

	usleep_range(100, 200);

	value = padctl_readl(padctl, XUSB_PADCTL_ELPG_PROGRAM);
	value |= XUSB_PADCTL_ELPG_PROGRAM_AUX_MUX_LP0_CLAMP_EN;
	padctl_writel(padctl, value, XUSB_PADCTL_ELPG_PROGRAM);

out:
	mutex_unlock(&padctl->lock);
	return 0;
}

static int tegra_xusb_phy_init(struct phy *phy)
{
	struct tegra_xusb_padctl *padctl = phy_get_drvdata(phy);

	return tegra_xusb_padctl_enable(padctl);
}

static int tegra_xusb_phy_exit(struct phy *phy)
{
	struct tegra_xusb_padctl *padctl = phy_get_drvdata(phy);

	return tegra_xusb_padctl_disable(padctl);
}

static int pcie_phy_power_on(struct phy *phy)
{
	struct tegra_xusb_padctl *padctl = phy_get_drvdata(phy);
	unsigned long timeout;
	int err = -ETIMEDOUT;
	u32 value;

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
	value &= ~XUSB_PADCTL_IOPHY_PLL_P0_CTL1_REFCLK_SEL_MASK;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL2);
	value |= XUSB_PADCTL_IOPHY_PLL_P0_CTL2_REFCLKBUF_EN |
		 XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_EN |
		 XUSB_PADCTL_IOPHY_PLL_P0_CTL2_TXCLKREF_SEL;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL2);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
	value |= XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL_RST;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);

	timeout = jiffies + msecs_to_jiffies(50);

	while (time_before(jiffies, timeout)) {
		value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
		if (value & XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL0_LOCKDET) {
			err = 0;
			break;
		}

		usleep_range(100, 200);
	}

	return err;
}

static int pcie_phy_power_off(struct phy *phy)
{
	struct tegra_xusb_padctl *padctl = phy_get_drvdata(phy);
	u32 value;

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);
	value &= ~XUSB_PADCTL_IOPHY_PLL_P0_CTL1_PLL_RST;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_P0_CTL1);

	return 0;
}

static const struct phy_ops pcie_phy_ops = {
	.init = tegra_xusb_phy_init,
	.exit = tegra_xusb_phy_exit,
	.power_on = pcie_phy_power_on,
	.power_off = pcie_phy_power_off,
	.owner = THIS_MODULE,
};

static int sata_phy_power_on(struct phy *phy)
{
	struct tegra_xusb_padctl *padctl = phy_get_drvdata(phy);
	unsigned long timeout;
	int err = -ETIMEDOUT;
	u32 value;

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);
	value &= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ_OVRD;
	value &= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
	value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_PWR_OVRD;
	value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_IDDQ;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
	value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_MODE;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
	value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_RST;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);

	timeout = jiffies + msecs_to_jiffies(50);

	while (time_before(jiffies, timeout)) {
		value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
		if (value & XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_LOCKDET) {
			err = 0;
			break;
		}

		usleep_range(100, 200);
	}

	return err;
}

static int sata_phy_power_off(struct phy *phy)
{
	struct tegra_xusb_padctl *padctl = phy_get_drvdata(phy);
	u32 value;

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
	value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_RST;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
	value &= ~XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL1_MODE;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);
	value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_PWR_OVRD;
	value |= XUSB_PADCTL_IOPHY_PLL_S0_CTL1_PLL_IDDQ;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_PLL_S0_CTL1);

	value = padctl_readl(padctl, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);
	value |= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ_OVRD;
	value |= ~XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1_IDDQ;
	padctl_writel(padctl, value, XUSB_PADCTL_IOPHY_MISC_PAD_S0_CTL1);

	return 0;
}

static const struct phy_ops sata_phy_ops = {
	.init = tegra_xusb_phy_init,
	.exit = tegra_xusb_phy_exit,
	.power_on = sata_phy_power_on,
	.power_off = sata_phy_power_off,
	.owner = THIS_MODULE,
};

static struct phy *tegra_xusb_padctl_xlate(struct device *dev,
					   struct of_phandle_args *args)
{
	struct tegra_xusb_padctl *padctl = dev_get_drvdata(dev);
	unsigned int index = args->args[0];

	if (args->args_count <= 0)
		return ERR_PTR(-EINVAL);

	if (index >= ARRAY_SIZE(padctl->phys))
		return ERR_PTR(-EINVAL);

	return padctl->phys[index];
}

#define PIN_OTG_0   0
#define PIN_OTG_1   1
#define PIN_OTG_2   2
#define PIN_ULPI_0  3
#define PIN_HSIC_0  4
#define PIN_HSIC_1  5
#define PIN_PCIE_0  6
#define PIN_PCIE_1  7
#define PIN_PCIE_2  8
#define PIN_PCIE_3  9
#define PIN_PCIE_4 10
#define PIN_SATA_0 11

static const struct pinctrl_pin_desc tegra124_pins[] = {
	PINCTRL_PIN(PIN_OTG_0,  "otg-0"),
	PINCTRL_PIN(PIN_OTG_1,  "otg-1"),
	PINCTRL_PIN(PIN_OTG_2,  "otg-2"),
	PINCTRL_PIN(PIN_ULPI_0, "ulpi-0"),
	PINCTRL_PIN(PIN_HSIC_0, "hsic-0"),
	PINCTRL_PIN(PIN_HSIC_1, "hsic-1"),
	PINCTRL_PIN(PIN_PCIE_0, "pcie-0"),
	PINCTRL_PIN(PIN_PCIE_1, "pcie-1"),
	PINCTRL_PIN(PIN_PCIE_2, "pcie-2"),
	PINCTRL_PIN(PIN_PCIE_3, "pcie-3"),
	PINCTRL_PIN(PIN_PCIE_4, "pcie-4"),
	PINCTRL_PIN(PIN_SATA_0, "sata-0"),
};

static const char * const tegra124_snps_groups[] = {
	"otg-0",
	"otg-1",
	"otg-2",
	"ulpi-0",
	"hsic-0",
	"hsic-1",
};

static const char * const tegra124_xusb_groups[] = {
	"otg-0",
	"otg-1",
	"otg-2",
	"ulpi-0",
	"hsic-0",
	"hsic-1",
};

static const char * const tegra124_uart_groups[] = {
	"otg-0",
	"otg-1",
	"otg-2",
};

static const char * const tegra124_pcie_groups[] = {
	"pcie-0",
	"pcie-1",
	"pcie-2",
	"pcie-3",
	"pcie-4",
	"sata-0",
};

static const char * const tegra124_usb3_groups[] = {
	"pcie-0",
	"pcie-1",
	"pcie-2",
	"pcie-3",
	"pcie-4",
	"sata-0",
};

static const char * const tegra124_sata_groups[] = {
	"pcie-0",
	"pcie-1",
	"pcie-2",
	"pcie-3",
	"pcie-4",
	"sata-0",
};

static const char * const tegra124_rsvd_groups[] = {
	"otg-0",
	"otg-1",
	"otg-2",
	"pcie-0",
	"pcie-1",
	"pcie-2",
	"pcie-3",
	"pcie-4",
	"sata-0",
};

#define TEGRA124_FUNCTION(_name)					\
	{								\
		.name = #_name,						\
		.num_groups = ARRAY_SIZE(tegra124_##_name##_groups),	\
		.groups = tegra124_##_name##_groups,			\
	}

static struct tegra_xusb_padctl_function tegra124_functions[] = {
	TEGRA124_FUNCTION(snps),
	TEGRA124_FUNCTION(xusb),
	TEGRA124_FUNCTION(uart),
	TEGRA124_FUNCTION(pcie),
	TEGRA124_FUNCTION(usb3),
	TEGRA124_FUNCTION(sata),
	TEGRA124_FUNCTION(rsvd),
};

enum tegra124_function {
	TEGRA124_FUNC_SNPS,
	TEGRA124_FUNC_XUSB,
	TEGRA124_FUNC_UART,
	TEGRA124_FUNC_PCIE,
	TEGRA124_FUNC_USB3,
	TEGRA124_FUNC_SATA,
	TEGRA124_FUNC_RSVD,
};

static const unsigned int tegra124_otg_functions[] = {
	TEGRA124_FUNC_SNPS,
	TEGRA124_FUNC_XUSB,
	TEGRA124_FUNC_UART,
	TEGRA124_FUNC_RSVD,
};

static const unsigned int tegra124_usb_functions[] = {
	TEGRA124_FUNC_SNPS,
	TEGRA124_FUNC_XUSB,
};

static const unsigned int tegra124_pci_functions[] = {
	TEGRA124_FUNC_PCIE,
	TEGRA124_FUNC_USB3,
	TEGRA124_FUNC_SATA,
	TEGRA124_FUNC_RSVD,
};

#define TEGRA124_LANE(_name, _offset, _shift, _mask, _iddq, _funcs)	\
	{								\
		.name = _name,						\
		.offset = _offset,					\
		.shift = _shift,					\
		.mask = _mask,						\
		.iddq = _iddq,						\
		.num_funcs = ARRAY_SIZE(tegra124_##_funcs##_functions),	\
		.funcs = tegra124_##_funcs##_functions,			\
	}

static const struct tegra_xusb_padctl_lane tegra124_lanes[] = {
	TEGRA124_LANE("otg-0",  0x004,  0, 0x3, 0, otg),
	TEGRA124_LANE("otg-1",  0x004,  2, 0x3, 0, otg),
	TEGRA124_LANE("otg-2",  0x004,  4, 0x3, 0, otg),
	TEGRA124_LANE("ulpi-0", 0x004, 12, 0x1, 0, usb),
	TEGRA124_LANE("hsic-0", 0x004, 14, 0x1, 0, usb),
	TEGRA124_LANE("hsic-1", 0x004, 15, 0x1, 0, usb),
	TEGRA124_LANE("pcie-0", 0x134, 16, 0x3, 1, pci),
	TEGRA124_LANE("pcie-1", 0x134, 18, 0x3, 2, pci),
	TEGRA124_LANE("pcie-2", 0x134, 20, 0x3, 3, pci),
	TEGRA124_LANE("pcie-3", 0x134, 22, 0x3, 4, pci),
	TEGRA124_LANE("pcie-4", 0x134, 24, 0x3, 5, pci),
	TEGRA124_LANE("sata-0", 0x134, 26, 0x3, 6, pci),
};

static const struct tegra_xusb_padctl_soc tegra124_soc = {
	.num_pins = ARRAY_SIZE(tegra124_pins),
	.pins = tegra124_pins,
	.num_functions = ARRAY_SIZE(tegra124_functions),
	.functions = tegra124_functions,
	.num_lanes = ARRAY_SIZE(tegra124_lanes),
	.lanes = tegra124_lanes,
};

static const struct of_device_id tegra_xusb_padctl_of_match[] = {
	{ .compatible = "nvidia,tegra124-xusb-padctl", .data = &tegra124_soc },
	{ }
};
MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match);

static int tegra_xusb_padctl_probe(struct platform_device *pdev)
{
	struct tegra_xusb_padctl *padctl;
	const struct of_device_id *match;
	struct resource *res;
	struct phy *phy;
	int err;

	padctl = devm_kzalloc(&pdev->dev, sizeof(*padctl), GFP_KERNEL);
	if (!padctl)
		return -ENOMEM;

	platform_set_drvdata(pdev, padctl);
	mutex_init(&padctl->lock);
	padctl->dev = &pdev->dev;

	match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node);
	padctl->soc = match->data;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	padctl->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(padctl->regs))
		return PTR_ERR(padctl->regs);

	padctl->rst = devm_reset_control_get(&pdev->dev, NULL);
	if (IS_ERR(padctl->rst))
		return PTR_ERR(padctl->rst);

	err = reset_control_deassert(padctl->rst);
	if (err < 0)
		return err;

	memset(&padctl->desc, 0, sizeof(padctl->desc));
	padctl->desc.name = dev_name(padctl->dev);
	padctl->desc.pctlops = &tegra_xusb_padctl_pinctrl_ops;
	padctl->desc.pmxops = &tegra_xusb_padctl_pinmux_ops;
	padctl->desc.confops = &tegra_xusb_padctl_pinconf_ops;
	padctl->desc.owner = THIS_MODULE;

	padctl->pinctrl = pinctrl_register(&padctl->desc, &pdev->dev, padctl);
	if (!padctl->pinctrl) {
		dev_err(&pdev->dev, "failed to register pincontrol\n");
		err = -ENODEV;
		goto reset;
	}

	phy = devm_phy_create(&pdev->dev, NULL, &pcie_phy_ops, NULL);
	if (IS_ERR(phy)) {
		err = PTR_ERR(phy);
		goto unregister;
	}

	padctl->phys[TEGRA_XUSB_PADCTL_PCIE] = phy;
	phy_set_drvdata(phy, padctl);

	phy = devm_phy_create(&pdev->dev, NULL, &sata_phy_ops, NULL);
	if (IS_ERR(phy)) {
		err = PTR_ERR(phy);
		goto unregister;
	}

	padctl->phys[TEGRA_XUSB_PADCTL_SATA] = phy;
	phy_set_drvdata(phy, padctl);

	padctl->provider = devm_of_phy_provider_register(&pdev->dev,
							 tegra_xusb_padctl_xlate);
	if (IS_ERR(padctl->provider)) {
		err = PTR_ERR(padctl->provider);
		dev_err(&pdev->dev, "failed to register PHYs: %d\n", err);
		goto unregister;
	}

	return 0;

unregister:
	pinctrl_unregister(padctl->pinctrl);
reset:
	reset_control_assert(padctl->rst);
	return err;
}

static int tegra_xusb_padctl_remove(struct platform_device *pdev)
{
	struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
	int err;

	pinctrl_unregister(padctl->pinctrl);

	err = reset_control_assert(padctl->rst);
	if (err < 0)
		dev_err(&pdev->dev, "failed to assert reset: %d\n", err);

	return err;
}

static struct platform_driver tegra_xusb_padctl_driver = {
	.driver = {
		.name = "tegra-xusb-padctl",
		.of_match_table = tegra_xusb_padctl_of_match,
	},
	.probe = tegra_xusb_padctl_probe,
	.remove = tegra_xusb_padctl_remove,
};
module_platform_driver(tegra_xusb_padctl_driver);

MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("Tegra 124 XUSB Pad Control driver");
MODULE_LICENSE("GPL v2");