ARM: tegra: Add XUSB pad controller support

Adds device tree bindings and a driver for the XUSB pad controller found
 on Tegra114 and later. This is a prerequisites for PCIe, SATA and XUSB
 drivers which are all currently being reviewed or pending for merge.
 
 This is a separate branch in case it needs to be pulled into the pinctrl
 tree to resolve conflicts.
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Merge tag 'tegra-for-3.17-xusb-padctl' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/dt

Merge "ARM: tegra: Add XUSB pad controller support" from Thierry Reding:

Adds device tree bindings and a driver for the XUSB pad controller found
on Tegra114 and later. This is a prerequisites for PCIe, SATA and XUSB
drivers which are all currently being reviewed or pending for merge.

This is a separate branch in case it needs to be pulled into the pinctrl
tree to resolve conflicts.

* tag 'tegra-for-3.17-xusb-padctl' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  pinctrl: Add NVIDIA Tegra XUSB pad controller support
  of: Add NVIDIA Tegra XUSB pad controller binding

Signed-off-by: Olof Johansson <olof@lixom.net>

Documentation/devicetree/bindings/pinctrl/nvidia,tegra124-xusb-padctl.txt

@@ -0,0 +1,127 @@
+Device tree binding for NVIDIA Tegra XUSB pad controller
+========================================================
+
+The Tegra XUSB pad controller manages a set of lanes, each of which can be
+assigned to one out of a set of different pads. Some of these pads have an
+associated PHY that must be powered up before the pad can be used.
+
+This document defines the device-specific binding for the XUSB pad controller.
+
+Refer to pinctrl-bindings.txt in this directory for generic information about
+pin controller device tree bindings and ../phy/phy-bindings.txt for details on
+how to describe and reference PHYs in device trees.
+
+Required properties:
+--------------------
+- compatible: should be "nvidia,tegra124-xusb-padctl"
+- reg: Physical base address and length of the controller's registers.
+- resets: Must contain an entry for each entry in reset-names.
+  See ../reset/reset.txt for details.
+- reset-names: Must include the following entries:
+  - padctl
+- #phy-cells: Should be 1. The specifier is the index of the PHY to reference.
+  See <dt-bindings/pinctrl/pinctrl-tegra-xusb.h> for the list of valid values.
+
+Lane muxing:
+------------
+
+Child nodes contain the pinmux configurations following the conventions from
+the pinctrl-bindings.txt document. Typically a single, static configuration is
+given and applied at boot time.
+
+Each subnode describes groups of lanes along with parameters and pads that
+they should be assigned to. The name of these subnodes is not important. All
+subnodes should be parsed solely based on their content.
+
+Each subnode only applies the parameters that are explicitly listed. In other
+words, if a subnode that lists a function but no pin configuration parameters
+implies no information about any pin configuration parameters. Similarly, a
+subnode that describes only an IDDQ parameter implies no information about
+what function the pins are assigned to. For this reason even seemingly boolean
+values are actually tristates in this binding: unspecified, off or on.
+Unspecified is represented as an absent property, and off/on are represented
+as integer values 0 and 1.
+
+Required properties:
+- nvidia,lanes: An array of strings. Each string is the name of a lane.
+
+Optional properties:
+- nvidia,function: A string that is the name of the function (pad) that the
+  pin or group should be assigned to. Valid values for function names are
+  listed below.
+- nvidia,iddq: Enables IDDQ mode of the lane. (0: no, 1: yes)
+
+Note that not all of these properties are valid for all lanes. Lanes can be
+divided into three groups:
+
+  - otg-0, otg-1, otg-2:
+
+    Valid functions for this group are: "snps", "xusb", "uart", "rsvd".
+
+    The nvidia,iddq property does not apply to this group.
+
+  - ulpi-0, hsic-0, hsic-1:
+
+    Valid functions for this group are: "snps", "xusb".
+
+    The nvidia,iddq property does not apply to this group.
+
+  - pcie-0, pcie-1, pcie-2, pcie-3, pcie-4, sata-0:
+
+    Valid functions for this group are: "pcie", "usb3", "sata", "rsvd".
+
+
+Example:
+========
+
+SoC file extract:
+-----------------
+
+	padctl@0,7009f000 {
+		compatible = "nvidia,tegra124-xusb-padctl";
+		reg = <0x0 0x7009f000 0x0 0x1000>;
+		resets = <&tegra_car 142>;
+		reset-names = "padctl";
+
+		#phy-cells = <1>;
+	};
+
+Board file extract:
+-------------------
+
+	pcie-controller@0,01003000 {
+		...
+
+		phys = <&padctl 0>;
+		phy-names = "pcie";
+
+		...
+	};
+
+	...
+
+	padctl: padctl@0,7009f000 {
+		pinctrl-0 = <&padctl_default>;
+		pinctrl-names = "default";
+
+		padctl_default: pinmux {
+			usb3 {
+				nvidia,lanes = "pcie-0", "pcie-1";
+				nvidia,function = "usb3";
+				nvidia,iddq = <0>;
+			};
+
+			pcie {
+				nvidia,lanes = "pcie-2", "pcie-3",
+					       "pcie-4";
+				nvidia,function = "pcie";
+				nvidia,iddq = <0>;
+			};
+
+			sata {
+				nvidia,lanes = "sata-0";
+				nvidia,function = "sata";
+				nvidia,iddq = <0>;
+			};
+		};
+	};

drivers/pinctrl/Kconfig

@@ -328,6 +328,12 @@ config PINCTRL_TEGRA124
 	bool
 	select PINCTRL_TEGRA
 
+config PINCTRL_TEGRA_XUSB
+	def_bool y if ARCH_TEGRA
+	select GENERIC_PHY
+	select PINCONF
+	select PINMUX
+
 config PINCTRL_TZ1090
 	bool "Toumaz Xenif TZ1090 pin control driver"
 	depends on SOC_TZ1090

drivers/pinctrl/Makefile

@@ -55,6 +55,7 @@ obj-$(CONFIG_PINCTRL_TEGRA20)	+= pinctrl-tegra20.o
 obj-$(CONFIG_PINCTRL_TEGRA30)	+= pinctrl-tegra30.o
 obj-$(CONFIG_PINCTRL_TEGRA114)	+= pinctrl-tegra114.o
 obj-$(CONFIG_PINCTRL_TEGRA124)	+= pinctrl-tegra124.o
+obj-$(CONFIG_PINCTRL_TEGRA_XUSB)	+= pinctrl-tegra-xusb.o
 obj-$(CONFIG_PINCTRL_TZ1090)	+= pinctrl-tz1090.o
 obj-$(CONFIG_PINCTRL_TZ1090_PDC)	+= pinctrl-tz1090-pdc.o
 obj-$(CONFIG_PINCTRL_U300)	+= pinctrl-u300.o

drivers/pinctrl/pinctrl-tegra-xusb.c

@@ -0,0 +1,973 @@
+/*
+ * 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_enable(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,
+	.enable = tegra_xusb_padctl_pinmux_enable,
+};
+
+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, &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, &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 (err < 0) {
+		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");

include/dt-bindings/pinctrl/pinctrl-tegra-xusb.h

@@ -0,0 +1,7 @@
+#ifndef _DT_BINDINGS_PINCTRL_TEGRA_XUSB_H
+#define _DT_BINDINGS_PINCTRL_TEGRA_XUSB_H 1
+
+#define TEGRA_XUSB_PADCTL_PCIE 0
+#define TEGRA_XUSB_PADCTL_SATA 1
+
+#endif /* _DT_BINDINGS_PINCTRL_TEGRA_XUSB_H */