Merge tag 'tegra-for-4.3-clk' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into clk-next
clk: tegra: Changes for v4.3-rc1
This contains the DFLL driver needed to implement CPU frequency scaling
on Tegra.
diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
new file mode 100644
index 0000000..ee7e5fd
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
@@ -0,0 +1,79 @@
+NVIDIA Tegra124 DFLL FCPU clocksource
+
+This binding uses the common clock binding:
+Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+The DFLL IP block on Tegra is a root clocksource designed for clocking
+the fast CPU cluster. It consists of a free-running voltage controlled
+oscillator connected to the CPU voltage rail (VDD_CPU), and a closed loop
+control module that will automatically adjust the VDD_CPU voltage by
+communicating with an off-chip PMIC either via an I2C bus or via PWM signals.
+Currently only the I2C mode is supported by these bindings.
+
+Required properties:
+- compatible : should be "nvidia,tegra124-dfll"
+- reg : Defines the following set of registers, in the order listed:
+ - registers for the DFLL control logic.
+ - registers for the I2C output logic.
+ - registers for the integrated I2C master controller.
+ - look-up table RAM for voltage register values.
+- interrupts: Should contain the DFLL block interrupt.
+- clocks: Must contain an entry for each entry in clock-names.
+ See clock-bindings.txt for details.
+- clock-names: Must include the following entries:
+ - soc: Clock source for the DFLL control logic.
+ - ref: The closed loop reference clock
+ - i2c: Clock source for the integrated I2C master.
+- resets: Must contain an entry for each entry in reset-names.
+ See ../reset/reset.txt for details.
+- reset-names: Must include the following entries:
+ - dvco: Reset control for the DFLL DVCO.
+- #clock-cells: Must be 0.
+- clock-output-names: Name of the clock output.
+- vdd-cpu-supply: Regulator for the CPU voltage rail that the DFLL
+ hardware will start controlling. The regulator will be queried for
+ the I2C register, control values and supported voltages.
+
+Required properties for the control loop parameters:
+- nvidia,sample-rate: Sample rate of the DFLL control loop.
+- nvidia,droop-ctrl: See the register CL_DVFS_DROOP_CTRL in the TRM.
+- nvidia,force-mode: See the field DFLL_PARAMS_FORCE_MODE in the TRM.
+- nvidia,cf: Numeric value, see the field DFLL_PARAMS_CF_PARAM in the TRM.
+- nvidia,ci: Numeric value, see the field DFLL_PARAMS_CI_PARAM in the TRM.
+- nvidia,cg: Numeric value, see the field DFLL_PARAMS_CG_PARAM in the TRM.
+
+Optional properties for the control loop parameters:
+- nvidia,cg-scale: Boolean value, see the field DFLL_PARAMS_CG_SCALE in the TRM.
+
+Required properties for I2C mode:
+- nvidia,i2c-fs-rate: I2C transfer rate, if using full speed mode.
+
+Example:
+
+clock@0,70110000 {
+ compatible = "nvidia,tegra124-dfll";
+ reg = <0 0x70110000 0 0x100>, /* DFLL control */
+ <0 0x70110000 0 0x100>, /* I2C output control */
+ <0 0x70110100 0 0x100>, /* Integrated I2C controller */
+ <0 0x70110200 0 0x100>; /* Look-up table RAM */
+ interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&tegra_car TEGRA124_CLK_DFLL_SOC>,
+ <&tegra_car TEGRA124_CLK_DFLL_REF>,
+ <&tegra_car TEGRA124_CLK_I2C5>;
+ clock-names = "soc", "ref", "i2c";
+ resets = <&tegra_car TEGRA124_RST_DFLL_DVCO>;
+ reset-names = "dvco";
+ #clock-cells = <0>;
+ clock-output-names = "dfllCPU_out";
+ vdd-cpu-supply = <&vdd_cpu>;
+ status = "okay";
+
+ nvidia,sample-rate = <12500>;
+ nvidia,droop-ctrl = <0x00000f00>;
+ nvidia,force-mode = <1>;
+ nvidia,cf = <10>;
+ nvidia,ci = <0>;
+ nvidia,cg = <2>;
+
+ nvidia,i2c-fs-rate = <400000>;
+};
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 5d1a318..0fa4c5f 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -8,6 +8,7 @@
select HAVE_ARM_SCU if SMP
select HAVE_ARM_TWD if SMP
select PINCTRL
+ select PM_OPP
select ARCH_HAS_RESET_CONTROLLER
select RESET_CONTROLLER
select SOC_BUS
diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile
index aec862b..826c325 100644
--- a/drivers/clk/tegra/Makefile
+++ b/drivers/clk/tegra/Makefile
@@ -1,5 +1,6 @@
obj-y += clk.o
obj-y += clk-audio-sync.o
+obj-y += clk-dfll.o
obj-y += clk-divider.o
obj-y += clk-periph.o
obj-y += clk-periph-gate.o
@@ -16,4 +17,6 @@
obj-$(CONFIG_ARCH_TEGRA_3x_SOC) += clk-tegra30.o
obj-$(CONFIG_ARCH_TEGRA_114_SOC) += clk-tegra114.o
obj-$(CONFIG_ARCH_TEGRA_124_SOC) += clk-tegra124.o
+obj-$(CONFIG_ARCH_TEGRA_124_SOC) += clk-tegra124-dfll-fcpu.o
obj-$(CONFIG_ARCH_TEGRA_132_SOC) += clk-tegra124.o
+obj-y += cvb.o
diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c
new file mode 100644
index 0000000..109a79b
--- /dev/null
+++ b/drivers/clk/tegra/clk-dfll.c
@@ -0,0 +1,1755 @@
+/*
+ * clk-dfll.c - Tegra DFLL clock source common code
+ *
+ * Copyright (C) 2012-2014 NVIDIA Corporation. All rights reserved.
+ *
+ * Aleksandr Frid <afrid@nvidia.com>
+ * Paul Walmsley <pwalmsley@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * This library is for the DVCO and DFLL IP blocks on the Tegra124
+ * SoC. These IP blocks together are also known at NVIDIA as
+ * "CL-DVFS". To try to avoid confusion, this code refers to them
+ * collectively as the "DFLL."
+ *
+ * The DFLL is a root clocksource which tolerates some amount of
+ * supply voltage noise. Tegra124 uses it to clock the fast CPU
+ * complex when the target CPU speed is above a particular rate. The
+ * DFLL can be operated in either open-loop mode or closed-loop mode.
+ * In open-loop mode, the DFLL generates an output clock appropriate
+ * to the supply voltage. In closed-loop mode, when configured with a
+ * target frequency, the DFLL minimizes supply voltage while
+ * delivering an average frequency equal to the target.
+ *
+ * Devices clocked by the DFLL must be able to tolerate frequency
+ * variation. In the case of the CPU, it's important to note that the
+ * CPU cycle time will vary. This has implications for
+ * performance-measurement code and any code that relies on the CPU
+ * cycle time to delay for a certain length of time.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm_opp.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/seq_file.h>
+
+#include "clk-dfll.h"
+
+/*
+ * DFLL control registers - access via dfll_{readl,writel}
+ */
+
+/* DFLL_CTRL: DFLL control register */
+#define DFLL_CTRL 0x00
+#define DFLL_CTRL_MODE_MASK 0x03
+
+/* DFLL_CONFIG: DFLL sample rate control */
+#define DFLL_CONFIG 0x04
+#define DFLL_CONFIG_DIV_MASK 0xff
+#define DFLL_CONFIG_DIV_PRESCALE 32
+
+/* DFLL_PARAMS: tuning coefficients for closed loop integrator */
+#define DFLL_PARAMS 0x08
+#define DFLL_PARAMS_CG_SCALE (0x1 << 24)
+#define DFLL_PARAMS_FORCE_MODE_SHIFT 22
+#define DFLL_PARAMS_FORCE_MODE_MASK (0x3 << DFLL_PARAMS_FORCE_MODE_SHIFT)
+#define DFLL_PARAMS_CF_PARAM_SHIFT 16
+#define DFLL_PARAMS_CF_PARAM_MASK (0x3f << DFLL_PARAMS_CF_PARAM_SHIFT)
+#define DFLL_PARAMS_CI_PARAM_SHIFT 8
+#define DFLL_PARAMS_CI_PARAM_MASK (0x7 << DFLL_PARAMS_CI_PARAM_SHIFT)
+#define DFLL_PARAMS_CG_PARAM_SHIFT 0
+#define DFLL_PARAMS_CG_PARAM_MASK (0xff << DFLL_PARAMS_CG_PARAM_SHIFT)
+
+/* DFLL_TUNE0: delay line configuration register 0 */
+#define DFLL_TUNE0 0x0c
+
+/* DFLL_TUNE1: delay line configuration register 1 */
+#define DFLL_TUNE1 0x10
+
+/* DFLL_FREQ_REQ: target DFLL frequency control */
+#define DFLL_FREQ_REQ 0x14
+#define DFLL_FREQ_REQ_FORCE_ENABLE (0x1 << 28)
+#define DFLL_FREQ_REQ_FORCE_SHIFT 16
+#define DFLL_FREQ_REQ_FORCE_MASK (0xfff << DFLL_FREQ_REQ_FORCE_SHIFT)
+#define FORCE_MAX 2047
+#define FORCE_MIN -2048
+#define DFLL_FREQ_REQ_SCALE_SHIFT 8
+#define DFLL_FREQ_REQ_SCALE_MASK (0xff << DFLL_FREQ_REQ_SCALE_SHIFT)
+#define DFLL_FREQ_REQ_SCALE_MAX 256
+#define DFLL_FREQ_REQ_FREQ_VALID (0x1 << 7)
+#define DFLL_FREQ_REQ_MULT_SHIFT 0
+#define DFLL_FREQ_REG_MULT_MASK (0x7f << DFLL_FREQ_REQ_MULT_SHIFT)
+#define FREQ_MAX 127
+
+/* DFLL_DROOP_CTRL: droop prevention control */
+#define DFLL_DROOP_CTRL 0x1c
+
+/* DFLL_OUTPUT_CFG: closed loop mode control registers */
+/* NOTE: access via dfll_i2c_{readl,writel} */
+#define DFLL_OUTPUT_CFG 0x20
+#define DFLL_OUTPUT_CFG_I2C_ENABLE (0x1 << 30)
+#define OUT_MASK 0x3f
+#define DFLL_OUTPUT_CFG_SAFE_SHIFT 24
+#define DFLL_OUTPUT_CFG_SAFE_MASK \
+ (OUT_MASK << DFLL_OUTPUT_CFG_SAFE_SHIFT)
+#define DFLL_OUTPUT_CFG_MAX_SHIFT 16
+#define DFLL_OUTPUT_CFG_MAX_MASK \
+ (OUT_MASK << DFLL_OUTPUT_CFG_MAX_SHIFT)
+#define DFLL_OUTPUT_CFG_MIN_SHIFT 8
+#define DFLL_OUTPUT_CFG_MIN_MASK \
+ (OUT_MASK << DFLL_OUTPUT_CFG_MIN_SHIFT)
+#define DFLL_OUTPUT_CFG_PWM_DELTA (0x1 << 7)
+#define DFLL_OUTPUT_CFG_PWM_ENABLE (0x1 << 6)
+#define DFLL_OUTPUT_CFG_PWM_DIV_SHIFT 0
+#define DFLL_OUTPUT_CFG_PWM_DIV_MASK \
+ (OUT_MASK << DFLL_OUTPUT_CFG_PWM_DIV_SHIFT)
+
+/* DFLL_OUTPUT_FORCE: closed loop mode voltage forcing control */
+#define DFLL_OUTPUT_FORCE 0x24
+#define DFLL_OUTPUT_FORCE_ENABLE (0x1 << 6)
+#define DFLL_OUTPUT_FORCE_VALUE_SHIFT 0
+#define DFLL_OUTPUT_FORCE_VALUE_MASK \
+ (OUT_MASK << DFLL_OUTPUT_FORCE_VALUE_SHIFT)
+
+/* DFLL_MONITOR_CTRL: internal monitor data source control */
+#define DFLL_MONITOR_CTRL 0x28
+#define DFLL_MONITOR_CTRL_FREQ 6
+
+/* DFLL_MONITOR_DATA: internal monitor data output */
+#define DFLL_MONITOR_DATA 0x2c
+#define DFLL_MONITOR_DATA_NEW_MASK (0x1 << 16)
+#define DFLL_MONITOR_DATA_VAL_SHIFT 0
+#define DFLL_MONITOR_DATA_VAL_MASK (0xFFFF << DFLL_MONITOR_DATA_VAL_SHIFT)
+
+/*
+ * I2C output control registers - access via dfll_i2c_{readl,writel}
+ */
+
+/* DFLL_I2C_CFG: I2C controller configuration register */
+#define DFLL_I2C_CFG 0x40
+#define DFLL_I2C_CFG_ARB_ENABLE (0x1 << 20)
+#define DFLL_I2C_CFG_HS_CODE_SHIFT 16
+#define DFLL_I2C_CFG_HS_CODE_MASK (0x7 << DFLL_I2C_CFG_HS_CODE_SHIFT)
+#define DFLL_I2C_CFG_PACKET_ENABLE (0x1 << 15)
+#define DFLL_I2C_CFG_SIZE_SHIFT 12
+#define DFLL_I2C_CFG_SIZE_MASK (0x7 << DFLL_I2C_CFG_SIZE_SHIFT)
+#define DFLL_I2C_CFG_SLAVE_ADDR_10 (0x1 << 10)
+#define DFLL_I2C_CFG_SLAVE_ADDR_SHIFT_7BIT 1
+#define DFLL_I2C_CFG_SLAVE_ADDR_SHIFT_10BIT 0
+
+/* DFLL_I2C_VDD_REG_ADDR: PMIC I2C address for closed loop mode */
+#define DFLL_I2C_VDD_REG_ADDR 0x44
+
+/* DFLL_I2C_STS: I2C controller status */
+#define DFLL_I2C_STS 0x48
+#define DFLL_I2C_STS_I2C_LAST_SHIFT 1
+#define DFLL_I2C_STS_I2C_REQ_PENDING 0x1
+
+/* DFLL_INTR_STS: DFLL interrupt status register */
+#define DFLL_INTR_STS 0x5c
+
+/* DFLL_INTR_EN: DFLL interrupt enable register */
+#define DFLL_INTR_EN 0x60
+#define DFLL_INTR_MIN_MASK 0x1
+#define DFLL_INTR_MAX_MASK 0x2
+
+/*
+ * Integrated I2C controller registers - relative to td->i2c_controller_base
+ */
+
+/* DFLL_I2C_CLK_DIVISOR: I2C controller clock divisor */
+#define DFLL_I2C_CLK_DIVISOR 0x6c
+#define DFLL_I2C_CLK_DIVISOR_MASK 0xffff
+#define DFLL_I2C_CLK_DIVISOR_FS_SHIFT 16
+#define DFLL_I2C_CLK_DIVISOR_HS_SHIFT 0
+#define DFLL_I2C_CLK_DIVISOR_PREDIV 8
+#define DFLL_I2C_CLK_DIVISOR_HSMODE_PREDIV 12
+
+/*
+ * Other constants
+ */
+
+/* MAX_DFLL_VOLTAGES: number of LUT entries in the DFLL IP block */
+#define MAX_DFLL_VOLTAGES 33
+
+/*
+ * REF_CLK_CYC_PER_DVCO_SAMPLE: the number of ref_clk cycles that the hardware
+ * integrates the DVCO counter over - used for debug rate monitoring and
+ * droop control
+ */
+#define REF_CLK_CYC_PER_DVCO_SAMPLE 4
+
+/*
+ * REF_CLOCK_RATE: the DFLL reference clock rate currently supported by this
+ * driver, in Hz
+ */
+#define REF_CLOCK_RATE 51000000UL
+
+#define DVCO_RATE_TO_MULT(rate, ref_rate) ((rate) / ((ref_rate) / 2))
+#define MULT_TO_DVCO_RATE(mult, ref_rate) ((mult) * ((ref_rate) / 2))
+
+/**
+ * enum dfll_ctrl_mode - DFLL hardware operating mode
+ * @DFLL_UNINITIALIZED: (uninitialized state - not in hardware bitfield)
+ * @DFLL_DISABLED: DFLL not generating an output clock
+ * @DFLL_OPEN_LOOP: DVCO running, but DFLL not adjusting voltage
+ * @DFLL_CLOSED_LOOP: DVCO running, and DFLL adjusting voltage to match
+ * the requested rate
+ *
+ * The integer corresponding to the last two states, minus one, is
+ * written to the DFLL hardware to change operating modes.
+ */
+enum dfll_ctrl_mode {
+ DFLL_UNINITIALIZED = 0,
+ DFLL_DISABLED = 1,
+ DFLL_OPEN_LOOP = 2,
+ DFLL_CLOSED_LOOP = 3,
+};
+
+/**
+ * enum dfll_tune_range - voltage range that the driver believes it's in
+ * @DFLL_TUNE_UNINITIALIZED: DFLL tuning not yet programmed
+ * @DFLL_TUNE_LOW: DFLL in the low-voltage range (or open-loop mode)
+ *
+ * Some DFLL tuning parameters may need to change depending on the
+ * DVCO's voltage; these states represent the ranges that the driver
+ * supports. These are software states; these values are never
+ * written into registers.
+ */
+enum dfll_tune_range {
+ DFLL_TUNE_UNINITIALIZED = 0,
+ DFLL_TUNE_LOW = 1,
+};
+
+/**
+ * struct dfll_rate_req - target DFLL rate request data
+ * @rate: target frequency, after the postscaling
+ * @dvco_target_rate: target frequency, after the postscaling
+ * @lut_index: LUT index at which voltage the dvco_target_rate will be reached
+ * @mult_bits: value to program to the MULT bits of the DFLL_FREQ_REQ register
+ * @scale_bits: value to program to the SCALE bits of the DFLL_FREQ_REQ register
+ */
+struct dfll_rate_req {
+ unsigned long rate;
+ unsigned long dvco_target_rate;
+ int lut_index;
+ u8 mult_bits;
+ u8 scale_bits;
+};
+
+struct tegra_dfll {
+ struct device *dev;
+ struct tegra_dfll_soc_data *soc;
+
+ void __iomem *base;
+ void __iomem *i2c_base;
+ void __iomem *i2c_controller_base;
+ void __iomem *lut_base;
+
+ struct regulator *vdd_reg;
+ struct clk *soc_clk;
+ struct clk *ref_clk;
+ struct clk *i2c_clk;
+ struct clk *dfll_clk;
+ struct reset_control *dvco_rst;
+ unsigned long ref_rate;
+ unsigned long i2c_clk_rate;
+ unsigned long dvco_rate_min;
+
+ enum dfll_ctrl_mode mode;
+ enum dfll_tune_range tune_range;
+ struct dentry *debugfs_dir;
+ struct clk_hw dfll_clk_hw;
+ const char *output_clock_name;
+ struct dfll_rate_req last_req;
+ unsigned long last_unrounded_rate;
+
+ /* Parameters from DT */
+ u32 droop_ctrl;
+ u32 sample_rate;
+ u32 force_mode;
+ u32 cf;
+ u32 ci;
+ u32 cg;
+ bool cg_scale;
+
+ /* I2C interface parameters */
+ u32 i2c_fs_rate;
+ u32 i2c_reg;
+ u32 i2c_slave_addr;
+
+ /* i2c_lut array entries are regulator framework selectors */
+ unsigned i2c_lut[MAX_DFLL_VOLTAGES];
+ int i2c_lut_size;
+ u8 lut_min, lut_max, lut_safe;
+};
+
+#define clk_hw_to_dfll(_hw) container_of(_hw, struct tegra_dfll, dfll_clk_hw)
+
+/* mode_name: map numeric DFLL modes to names for friendly console messages */
+static const char * const mode_name[] = {
+ [DFLL_UNINITIALIZED] = "uninitialized",
+ [DFLL_DISABLED] = "disabled",
+ [DFLL_OPEN_LOOP] = "open_loop",
+ [DFLL_CLOSED_LOOP] = "closed_loop",
+};
+
+/*
+ * Register accessors
+ */
+
+static inline u32 dfll_readl(struct tegra_dfll *td, u32 offs)
+{
+ return __raw_readl(td->base + offs);
+}
+
+static inline void dfll_writel(struct tegra_dfll *td, u32 val, u32 offs)
+{
+ WARN_ON(offs >= DFLL_I2C_CFG);
+ __raw_writel(val, td->base + offs);
+}
+
+static inline void dfll_wmb(struct tegra_dfll *td)
+{
+ dfll_readl(td, DFLL_CTRL);
+}
+
+/* I2C output control registers - for addresses above DFLL_I2C_CFG */
+
+static inline u32 dfll_i2c_readl(struct tegra_dfll *td, u32 offs)
+{
+ return __raw_readl(td->i2c_base + offs);
+}
+
+static inline void dfll_i2c_writel(struct tegra_dfll *td, u32 val, u32 offs)
+{
+ __raw_writel(val, td->i2c_base + offs);
+}
+
+static inline void dfll_i2c_wmb(struct tegra_dfll *td)
+{
+ dfll_i2c_readl(td, DFLL_I2C_CFG);
+}
+
+/**
+ * dfll_is_running - is the DFLL currently generating a clock?
+ * @td: DFLL instance
+ *
+ * If the DFLL is currently generating an output clock signal, return
+ * true; otherwise return false.
+ */
+static bool dfll_is_running(struct tegra_dfll *td)
+{
+ return td->mode >= DFLL_OPEN_LOOP;
+}
+
+/*
+ * Runtime PM suspend/resume callbacks
+ */
+
+/**
+ * tegra_dfll_runtime_resume - enable all clocks needed by the DFLL
+ * @dev: DFLL device *
+ *
+ * Enable all clocks needed by the DFLL. Assumes that clk_prepare()
+ * has already been called on all the clocks.
+ *
+ * XXX Should also handle context restore when returning from off.
+ */
+int tegra_dfll_runtime_resume(struct device *dev)
+{
+ struct tegra_dfll *td = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_enable(td->ref_clk);
+ if (ret) {
+ dev_err(dev, "could not enable ref clock: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_enable(td->soc_clk);
+ if (ret) {
+ dev_err(dev, "could not enable register clock: %d\n", ret);
+ clk_disable(td->ref_clk);
+ return ret;
+ }
+
+ ret = clk_enable(td->i2c_clk);
+ if (ret) {
+ dev_err(dev, "could not enable i2c clock: %d\n", ret);
+ clk_disable(td->soc_clk);
+ clk_disable(td->ref_clk);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(tegra_dfll_runtime_resume);
+
+/**
+ * tegra_dfll_runtime_suspend - disable all clocks needed by the DFLL
+ * @dev: DFLL device *
+ *
+ * Disable all clocks needed by the DFLL. Assumes that other code
+ * will later call clk_unprepare().
+ */
+int tegra_dfll_runtime_suspend(struct device *dev)
+{
+ struct tegra_dfll *td = dev_get_drvdata(dev);
+
+ clk_disable(td->ref_clk);
+ clk_disable(td->soc_clk);
+ clk_disable(td->i2c_clk);
+
+ return 0;
+}
+EXPORT_SYMBOL(tegra_dfll_runtime_suspend);
+
+/*
+ * DFLL tuning operations (per-voltage-range tuning settings)
+ */
+
+/**
+ * dfll_tune_low - tune to DFLL and CPU settings valid for any voltage
+ * @td: DFLL instance
+ *
+ * Tune the DFLL oscillator parameters and the CPU clock shaper for
+ * the low-voltage range. These settings are valid for any voltage,
+ * but may not be optimal.
+ */
+static void dfll_tune_low(struct tegra_dfll *td)
+{
+ td->tune_range = DFLL_TUNE_LOW;
+
+ dfll_writel(td, td->soc->tune0_low, DFLL_TUNE0);
+ dfll_writel(td, td->soc->tune1, DFLL_TUNE1);
+ dfll_wmb(td);
+
+ if (td->soc->set_clock_trimmers_low)
+ td->soc->set_clock_trimmers_low();
+}
+
+/*
+ * Output clock scaler helpers
+ */
+
+/**
+ * dfll_scale_dvco_rate - calculate scaled rate from the DVCO rate
+ * @scale_bits: clock scaler value (bits in the DFLL_FREQ_REQ_SCALE field)
+ * @dvco_rate: the DVCO rate
+ *
+ * Apply the same scaling formula that the DFLL hardware uses to scale
+ * the DVCO rate.
+ */
+static unsigned long dfll_scale_dvco_rate(int scale_bits,
+ unsigned long dvco_rate)
+{
+ return (u64)dvco_rate * (scale_bits + 1) / DFLL_FREQ_REQ_SCALE_MAX;
+}
+
+/*
+ * Monitor control
+ */
+
+/**
+ * dfll_calc_monitored_rate - convert DFLL_MONITOR_DATA_VAL rate into real freq
+ * @monitor_data: value read from the DFLL_MONITOR_DATA_VAL bitfield
+ * @ref_rate: DFLL reference clock rate
+ *
+ * Convert @monitor_data from DFLL_MONITOR_DATA_VAL units into cycles
+ * per second. Returns the converted value.
+ */
+static u64 dfll_calc_monitored_rate(u32 monitor_data,
+ unsigned long ref_rate)
+{
+ return monitor_data * (ref_rate / REF_CLK_CYC_PER_DVCO_SAMPLE);
+}
+
+/**
+ * dfll_read_monitor_rate - return the DFLL's output rate from internal monitor
+ * @td: DFLL instance
+ *
+ * If the DFLL is enabled, return the last rate reported by the DFLL's
+ * internal monitoring hardware. This works in both open-loop and
+ * closed-loop mode, and takes the output scaler setting into account.
+ * Assumes that the monitor was programmed to monitor frequency before
+ * the sample period started. If the driver believes that the DFLL is
+ * currently uninitialized or disabled, it will return 0, since
+ * otherwise the DFLL monitor data register will return the last
+ * measured rate from when the DFLL was active.
+ */
+static u64 dfll_read_monitor_rate(struct tegra_dfll *td)
+{
+ u32 v, s;
+ u64 pre_scaler_rate, post_scaler_rate;
+
+ if (!dfll_is_running(td))
+ return 0;
+
+ v = dfll_readl(td, DFLL_MONITOR_DATA);
+ v = (v & DFLL_MONITOR_DATA_VAL_MASK) >> DFLL_MONITOR_DATA_VAL_SHIFT;
+ pre_scaler_rate = dfll_calc_monitored_rate(v, td->ref_rate);
+
+ s = dfll_readl(td, DFLL_FREQ_REQ);
+ s = (s & DFLL_FREQ_REQ_SCALE_MASK) >> DFLL_FREQ_REQ_SCALE_SHIFT;
+ post_scaler_rate = dfll_scale_dvco_rate(s, pre_scaler_rate);
+
+ return post_scaler_rate;
+}
+
+/*
+ * DFLL mode switching
+ */
+
+/**
+ * dfll_set_mode - change the DFLL control mode
+ * @td: DFLL instance
+ * @mode: DFLL control mode (see enum dfll_ctrl_mode)
+ *
+ * Change the DFLL's operating mode between disabled, open-loop mode,
+ * and closed-loop mode, or vice versa.
+ */
+static void dfll_set_mode(struct tegra_dfll *td,
+ enum dfll_ctrl_mode mode)
+{
+ td->mode = mode;
+ dfll_writel(td, mode - 1, DFLL_CTRL);
+ dfll_wmb(td);
+}
+
+/*
+ * DFLL-to-I2C controller interface
+ */
+
+/**
+ * dfll_i2c_set_output_enabled - enable/disable I2C PMIC voltage requests
+ * @td: DFLL instance
+ * @enable: whether to enable or disable the I2C voltage requests
+ *
+ * Set the master enable control for I2C control value updates. If disabled,
+ * then I2C control messages are inhibited, regardless of the DFLL mode.
+ */
+static int dfll_i2c_set_output_enabled(struct tegra_dfll *td, bool enable)
+{
+ u32 val;
+
+ val = dfll_i2c_readl(td, DFLL_OUTPUT_CFG);
+
+ if (enable)
+ val |= DFLL_OUTPUT_CFG_I2C_ENABLE;
+ else
+ val &= ~DFLL_OUTPUT_CFG_I2C_ENABLE;
+
+ dfll_i2c_writel(td, val, DFLL_OUTPUT_CFG);
+ dfll_i2c_wmb(td);
+
+ return 0;
+}
+
+/**
+ * dfll_load_lut - load the voltage lookup table
+ * @td: struct tegra_dfll *
+ *
+ * Load the voltage-to-PMIC register value lookup table into the DFLL
+ * IP block memory. Look-up tables can be loaded at any time.
+ */
+static void dfll_load_i2c_lut(struct tegra_dfll *td)
+{
+ int i, lut_index;
+ u32 val;
+
+ for (i = 0; i < MAX_DFLL_VOLTAGES; i++) {
+ if (i < td->lut_min)
+ lut_index = td->lut_min;
+ else if (i > td->lut_max)
+ lut_index = td->lut_max;
+ else
+ lut_index = i;
+
+ val = regulator_list_hardware_vsel(td->vdd_reg,
+ td->i2c_lut[lut_index]);
+ __raw_writel(val, td->lut_base + i * 4);
+ }
+
+ dfll_i2c_wmb(td);
+}
+
+/**
+ * dfll_init_i2c_if - set up the DFLL's DFLL-I2C interface
+ * @td: DFLL instance
+ *
+ * During DFLL driver initialization, program the DFLL-I2C interface
+ * with the PMU slave address, vdd register offset, and transfer mode.
+ * This data is used by the DFLL to automatically construct I2C
+ * voltage-set commands, which are then passed to the DFLL's internal
+ * I2C controller.
+ */
+static void dfll_init_i2c_if(struct tegra_dfll *td)
+{
+ u32 val;
+
+ if (td->i2c_slave_addr > 0x7f) {
+ val = td->i2c_slave_addr << DFLL_I2C_CFG_SLAVE_ADDR_SHIFT_10BIT;
+ val |= DFLL_I2C_CFG_SLAVE_ADDR_10;
+ } else {
+ val = td->i2c_slave_addr << DFLL_I2C_CFG_SLAVE_ADDR_SHIFT_7BIT;
+ }
+ val |= DFLL_I2C_CFG_SIZE_MASK;
+ val |= DFLL_I2C_CFG_ARB_ENABLE;
+ dfll_i2c_writel(td, val, DFLL_I2C_CFG);
+
+ dfll_i2c_writel(td, td->i2c_reg, DFLL_I2C_VDD_REG_ADDR);
+
+ val = DIV_ROUND_UP(td->i2c_clk_rate, td->i2c_fs_rate * 8);
+ BUG_ON(!val || (val > DFLL_I2C_CLK_DIVISOR_MASK));
+ val = (val - 1) << DFLL_I2C_CLK_DIVISOR_FS_SHIFT;
+
+ /* default hs divisor just in case */
+ val |= 1 << DFLL_I2C_CLK_DIVISOR_HS_SHIFT;
+ __raw_writel(val, td->i2c_controller_base + DFLL_I2C_CLK_DIVISOR);
+ dfll_i2c_wmb(td);
+}
+
+/**
+ * dfll_init_out_if - prepare DFLL-to-PMIC interface
+ * @td: DFLL instance
+ *
+ * During DFLL driver initialization or resume from context loss,
+ * disable the I2C command output to the PMIC, set safe voltage and
+ * output limits, and disable and clear limit interrupts.
+ */
+static void dfll_init_out_if(struct tegra_dfll *td)
+{
+ u32 val;
+
+ td->lut_min = 0;
+ td->lut_max = td->i2c_lut_size - 1;
+ td->lut_safe = td->lut_min + 1;
+
+ dfll_i2c_writel(td, 0, DFLL_OUTPUT_CFG);
+ val = (td->lut_safe << DFLL_OUTPUT_CFG_SAFE_SHIFT) |
+ (td->lut_max << DFLL_OUTPUT_CFG_MAX_SHIFT) |
+ (td->lut_min << DFLL_OUTPUT_CFG_MIN_SHIFT);
+ dfll_i2c_writel(td, val, DFLL_OUTPUT_CFG);
+ dfll_i2c_wmb(td);
+
+ dfll_writel(td, 0, DFLL_OUTPUT_FORCE);
+ dfll_i2c_writel(td, 0, DFLL_INTR_EN);
+ dfll_i2c_writel(td, DFLL_INTR_MAX_MASK | DFLL_INTR_MIN_MASK,
+ DFLL_INTR_STS);
+
+ dfll_load_i2c_lut(td);
+ dfll_init_i2c_if(td);
+}
+
+/*
+ * Set/get the DFLL's targeted output clock rate
+ */
+
+/**
+ * find_lut_index_for_rate - determine I2C LUT index for given DFLL rate
+ * @td: DFLL instance
+ * @rate: clock rate
+ *
+ * Determines the index of a I2C LUT entry for a voltage that approximately
+ * produces the given DFLL clock rate. This is used when forcing a value
+ * to the integrator during rate changes. Returns -ENOENT if a suitable
+ * LUT index is not found.
+ */
+static int find_lut_index_for_rate(struct tegra_dfll *td, unsigned long rate)
+{
+ struct dev_pm_opp *opp;
+ int i, uv;
+
+ opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
+ if (IS_ERR(opp))
+ return PTR_ERR(opp);
+ uv = dev_pm_opp_get_voltage(opp);
+
+ for (i = 0; i < td->i2c_lut_size; i++) {
+ if (regulator_list_voltage(td->vdd_reg, td->i2c_lut[i]) == uv)
+ return i;
+ }
+
+ return -ENOENT;
+}
+
+/**
+ * dfll_calculate_rate_request - calculate DFLL parameters for a given rate
+ * @td: DFLL instance
+ * @req: DFLL-rate-request structure
+ * @rate: the desired DFLL rate
+ *
+ * Populate the DFLL-rate-request record @req fields with the scale_bits
+ * and mult_bits fields, based on the target input rate. Returns 0 upon
+ * success, or -EINVAL if the requested rate in req->rate is too high
+ * or low for the DFLL to generate.
+ */
+static int dfll_calculate_rate_request(struct tegra_dfll *td,
+ struct dfll_rate_req *req,
+ unsigned long rate)
+{
+ u32 val;
+
+ /*
+ * If requested rate is below the minimum DVCO rate, active the scaler.
+ * In the future the DVCO minimum voltage should be selected based on
+ * chip temperature and the actual minimum rate should be calibrated
+ * at runtime.
+ */
+ req->scale_bits = DFLL_FREQ_REQ_SCALE_MAX - 1;
+ if (rate < td->dvco_rate_min) {
+ int scale;
+
+ scale = DIV_ROUND_CLOSEST(rate / 1000 * DFLL_FREQ_REQ_SCALE_MAX,
+ td->dvco_rate_min / 1000);
+ if (!scale) {
+ dev_err(td->dev, "%s: Rate %lu is too low\n",
+ __func__, rate);
+ return -EINVAL;
+ }
+ req->scale_bits = scale - 1;
+ rate = td->dvco_rate_min;
+ }
+
+ /* Convert requested rate into frequency request and scale settings */
+ val = DVCO_RATE_TO_MULT(rate, td->ref_rate);
+ if (val > FREQ_MAX) {
+ dev_err(td->dev, "%s: Rate %lu is above dfll range\n",
+ __func__, rate);
+ return -EINVAL;
+ }
+ req->mult_bits = val;
+ req->dvco_target_rate = MULT_TO_DVCO_RATE(req->mult_bits, td->ref_rate);
+ req->rate = dfll_scale_dvco_rate(req->scale_bits,
+ req->dvco_target_rate);
+ req->lut_index = find_lut_index_for_rate(td, req->dvco_target_rate);
+ if (req->lut_index < 0)
+ return req->lut_index;
+
+ return 0;
+}
+
+/**
+ * dfll_set_frequency_request - start the frequency change operation
+ * @td: DFLL instance
+ * @req: rate request structure
+ *
+ * Tell the DFLL to try to change its output frequency to the
+ * frequency represented by @req. DFLL must be in closed-loop mode.
+ */
+static void dfll_set_frequency_request(struct tegra_dfll *td,
+ struct dfll_rate_req *req)
+{
+ u32 val = 0;
+ int force_val;
+ int coef = 128; /* FIXME: td->cg_scale? */;
+
+ force_val = (req->lut_index - td->lut_safe) * coef / td->cg;
+ force_val = clamp(force_val, FORCE_MIN, FORCE_MAX);
+
+ val |= req->mult_bits << DFLL_FREQ_REQ_MULT_SHIFT;
+ val |= req->scale_bits << DFLL_FREQ_REQ_SCALE_SHIFT;
+ val |= ((u32)force_val << DFLL_FREQ_REQ_FORCE_SHIFT) &
+ DFLL_FREQ_REQ_FORCE_MASK;
+ val |= DFLL_FREQ_REQ_FREQ_VALID | DFLL_FREQ_REQ_FORCE_ENABLE;
+
+ dfll_writel(td, val, DFLL_FREQ_REQ);
+ dfll_wmb(td);
+}
+
+/**
+ * tegra_dfll_request_rate - set the next rate for the DFLL to tune to
+ * @td: DFLL instance
+ * @rate: clock rate to target
+ *
+ * Convert the requested clock rate @rate into the DFLL control logic
+ * settings. In closed-loop mode, update new settings immediately to
+ * adjust DFLL output rate accordingly. Otherwise, just save them
+ * until the next switch to closed loop. Returns 0 upon success,
+ * -EPERM if the DFLL driver has not yet been initialized, or -EINVAL
+ * if @rate is outside the DFLL's tunable range.
+ */
+static int dfll_request_rate(struct tegra_dfll *td, unsigned long rate)
+{
+ int ret;
+ struct dfll_rate_req req;
+
+ if (td->mode == DFLL_UNINITIALIZED) {
+ dev_err(td->dev, "%s: Cannot set DFLL rate in %s mode\n",
+ __func__, mode_name[td->mode]);
+ return -EPERM;
+ }
+
+ ret = dfll_calculate_rate_request(td, &req, rate);
+ if (ret)
+ return ret;
+
+ td->last_unrounded_rate = rate;
+ td->last_req = req;
+
+ if (td->mode == DFLL_CLOSED_LOOP)
+ dfll_set_frequency_request(td, &td->last_req);
+
+ return 0;
+}
+
+/*
+ * DFLL enable/disable & open-loop <-> closed-loop transitions
+ */
+
+/**
+ * dfll_disable - switch from open-loop mode to disabled mode
+ * @td: DFLL instance
+ *
+ * Switch from OPEN_LOOP state to DISABLED state. Returns 0 upon success
+ * or -EPERM if the DFLL is not currently in open-loop mode.
+ */
+static int dfll_disable(struct tegra_dfll *td)
+{
+ if (td->mode != DFLL_OPEN_LOOP) {
+ dev_err(td->dev, "cannot disable DFLL in %s mode\n",
+ mode_name[td->mode]);
+ return -EINVAL;
+ }
+
+ dfll_set_mode(td, DFLL_DISABLED);
+ pm_runtime_put_sync(td->dev);
+
+ return 0;
+}
+
+/**
+ * dfll_enable - switch a disabled DFLL to open-loop mode
+ * @td: DFLL instance
+ *
+ * Switch from DISABLED state to OPEN_LOOP state. Returns 0 upon success
+ * or -EPERM if the DFLL is not currently disabled.
+ */
+static int dfll_enable(struct tegra_dfll *td)
+{
+ if (td->mode != DFLL_DISABLED) {
+ dev_err(td->dev, "cannot enable DFLL in %s mode\n",
+ mode_name[td->mode]);
+ return -EPERM;
+ }
+
+ pm_runtime_get_sync(td->dev);
+ dfll_set_mode(td, DFLL_OPEN_LOOP);
+
+ return 0;
+}
+
+/**
+ * dfll_set_open_loop_config - prepare to switch to open-loop mode
+ * @td: DFLL instance
+ *
+ * Prepare to switch the DFLL to open-loop mode. This switches the
+ * DFLL to the low-voltage tuning range, ensures that I2C output
+ * forcing is disabled, and disables the output clock rate scaler.
+ * The DFLL's low-voltage tuning range parameters must be
+ * characterized to keep the downstream device stable at any DVCO
+ * input voltage. No return value.
+ */
+static void dfll_set_open_loop_config(struct tegra_dfll *td)
+{
+ u32 val;
+
+ /* always tune low (safe) in open loop */
+ if (td->tune_range != DFLL_TUNE_LOW)
+ dfll_tune_low(td);
+
+ val = dfll_readl(td, DFLL_FREQ_REQ);
+ val |= DFLL_FREQ_REQ_SCALE_MASK;
+ val &= ~DFLL_FREQ_REQ_FORCE_ENABLE;
+ dfll_writel(td, val, DFLL_FREQ_REQ);
+ dfll_wmb(td);
+}
+
+/**
+ * tegra_dfll_lock - switch from open-loop to closed-loop mode
+ * @td: DFLL instance
+ *
+ * Switch from OPEN_LOOP state to CLOSED_LOOP state. Returns 0 upon success,
+ * -EINVAL if the DFLL's target rate hasn't been set yet, or -EPERM if the
+ * DFLL is not currently in open-loop mode.
+ */
+static int dfll_lock(struct tegra_dfll *td)
+{
+ struct dfll_rate_req *req = &td->last_req;
+
+ switch (td->mode) {
+ case DFLL_CLOSED_LOOP:
+ return 0;
+
+ case DFLL_OPEN_LOOP:
+ if (req->rate == 0) {
+ dev_err(td->dev, "%s: Cannot lock DFLL at rate 0\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ dfll_i2c_set_output_enabled(td, true);
+ dfll_set_mode(td, DFLL_CLOSED_LOOP);
+ dfll_set_frequency_request(td, req);
+ return 0;
+
+ default:
+ BUG_ON(td->mode > DFLL_CLOSED_LOOP);
+ dev_err(td->dev, "%s: Cannot lock DFLL in %s mode\n",
+ __func__, mode_name[td->mode]);
+ return -EPERM;
+ }
+}
+
+/**
+ * tegra_dfll_unlock - switch from closed-loop to open-loop mode
+ * @td: DFLL instance
+ *
+ * Switch from CLOSED_LOOP state to OPEN_LOOP state. Returns 0 upon success,
+ * or -EPERM if the DFLL is not currently in open-loop mode.
+ */
+static int dfll_unlock(struct tegra_dfll *td)
+{
+ switch (td->mode) {
+ case DFLL_CLOSED_LOOP:
+ dfll_set_open_loop_config(td);
+ dfll_set_mode(td, DFLL_OPEN_LOOP);
+ dfll_i2c_set_output_enabled(td, false);
+ return 0;
+
+ case DFLL_OPEN_LOOP:
+ return 0;
+
+ default:
+ BUG_ON(td->mode > DFLL_CLOSED_LOOP);
+ dev_err(td->dev, "%s: Cannot unlock DFLL in %s mode\n",
+ __func__, mode_name[td->mode]);
+ return -EPERM;
+ }
+}
+
+/*
+ * Clock framework integration
+ *
+ * When the DFLL is being controlled by the CCF, always enter closed loop
+ * mode when the clk is enabled. This requires that a DFLL rate request
+ * has been set beforehand, which implies that a clk_set_rate() call is
+ * always required before a clk_enable().
+ */
+
+static int dfll_clk_is_enabled(struct clk_hw *hw)
+{
+ struct tegra_dfll *td = clk_hw_to_dfll(hw);
+
+ return dfll_is_running(td);
+}
+
+static int dfll_clk_enable(struct clk_hw *hw)
+{
+ struct tegra_dfll *td = clk_hw_to_dfll(hw);
+ int ret;
+
+ ret = dfll_enable(td);
+ if (ret)
+ return ret;
+
+ ret = dfll_lock(td);
+ if (ret)
+ dfll_disable(td);
+
+ return ret;
+}
+
+static void dfll_clk_disable(struct clk_hw *hw)
+{
+ struct tegra_dfll *td = clk_hw_to_dfll(hw);
+ int ret;
+
+ ret = dfll_unlock(td);
+ if (!ret)
+ dfll_disable(td);
+}
+
+static unsigned long dfll_clk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct tegra_dfll *td = clk_hw_to_dfll(hw);
+
+ return td->last_unrounded_rate;
+}
+
+static long dfll_clk_round_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *parent_rate)
+{
+ struct tegra_dfll *td = clk_hw_to_dfll(hw);
+ struct dfll_rate_req req;
+ int ret;
+
+ ret = dfll_calculate_rate_request(td, &req, rate);
+ if (ret)
+ return ret;
+
+ /*
+ * Don't return the rounded rate, since it doesn't really matter as
+ * the output rate will be voltage controlled anyway, and cpufreq
+ * freaks out if any rounding happens.
+ */
+ return rate;
+}
+
+static int dfll_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct tegra_dfll *td = clk_hw_to_dfll(hw);
+
+ return dfll_request_rate(td, rate);
+}
+
+static const struct clk_ops dfll_clk_ops = {
+ .is_enabled = dfll_clk_is_enabled,
+ .enable = dfll_clk_enable,
+ .disable = dfll_clk_disable,
+ .recalc_rate = dfll_clk_recalc_rate,
+ .round_rate = dfll_clk_round_rate,
+ .set_rate = dfll_clk_set_rate,
+};
+
+static struct clk_init_data dfll_clk_init_data = {
+ .flags = CLK_IS_ROOT,
+ .ops = &dfll_clk_ops,
+ .num_parents = 0,
+};
+
+/**
+ * dfll_register_clk - register the DFLL output clock with the clock framework
+ * @td: DFLL instance
+ *
+ * Register the DFLL's output clock with the Linux clock framework and register
+ * the DFLL driver as an OF clock provider. Returns 0 upon success or -EINVAL
+ * or -ENOMEM upon failure.
+ */
+static int dfll_register_clk(struct tegra_dfll *td)
+{
+ int ret;
+
+ dfll_clk_init_data.name = td->output_clock_name;
+ td->dfll_clk_hw.init = &dfll_clk_init_data;
+
+ td->dfll_clk = clk_register(td->dev, &td->dfll_clk_hw);
+ if (IS_ERR(td->dfll_clk)) {
+ dev_err(td->dev, "DFLL clock registration error\n");
+ return -EINVAL;
+ }
+
+ ret = of_clk_add_provider(td->dev->of_node, of_clk_src_simple_get,
+ td->dfll_clk);
+ if (ret) {
+ dev_err(td->dev, "of_clk_add_provider() failed\n");
+
+ clk_unregister(td->dfll_clk);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * dfll_unregister_clk - unregister the DFLL output clock
+ * @td: DFLL instance
+ *
+ * Unregister the DFLL's output clock from the Linux clock framework
+ * and from clkdev. No return value.
+ */
+static void dfll_unregister_clk(struct tegra_dfll *td)
+{
+ of_clk_del_provider(td->dev->of_node);
+ clk_unregister(td->dfll_clk);
+ td->dfll_clk = NULL;
+}
+
+/*
+ * Debugfs interface
+ */
+
+#ifdef CONFIG_DEBUG_FS
+
+static int attr_enable_get(void *data, u64 *val)
+{
+ struct tegra_dfll *td = data;
+
+ *val = dfll_is_running(td);
+
+ return 0;
+}
+static int attr_enable_set(void *data, u64 val)
+{
+ struct tegra_dfll *td = data;
+
+ return val ? dfll_enable(td) : dfll_disable(td);
+}
+DEFINE_SIMPLE_ATTRIBUTE(enable_fops, attr_enable_get, attr_enable_set,
+ "%llu\n");
+
+static int attr_lock_get(void *data, u64 *val)
+{
+ struct tegra_dfll *td = data;
+
+ *val = (td->mode == DFLL_CLOSED_LOOP);
+
+ return 0;
+}
+static int attr_lock_set(void *data, u64 val)
+{
+ struct tegra_dfll *td = data;
+
+ return val ? dfll_lock(td) : dfll_unlock(td);
+}
+DEFINE_SIMPLE_ATTRIBUTE(lock_fops, attr_lock_get, attr_lock_set,
+ "%llu\n");
+
+static int attr_rate_get(void *data, u64 *val)
+{
+ struct tegra_dfll *td = data;
+
+ *val = dfll_read_monitor_rate(td);
+
+ return 0;
+}
+
+static int attr_rate_set(void *data, u64 val)
+{
+ struct tegra_dfll *td = data;
+
+ return dfll_request_rate(td, val);
+}
+DEFINE_SIMPLE_ATTRIBUTE(rate_fops, attr_rate_get, attr_rate_set, "%llu\n");
+
+static int attr_registers_show(struct seq_file *s, void *data)
+{
+ u32 val, offs;
+ struct tegra_dfll *td = s->private;
+
+ seq_puts(s, "CONTROL REGISTERS:\n");
+ for (offs = 0; offs <= DFLL_MONITOR_DATA; offs += 4) {
+ if (offs == DFLL_OUTPUT_CFG)
+ val = dfll_i2c_readl(td, offs);
+ else
+ val = dfll_readl(td, offs);
+ seq_printf(s, "[0x%02x] = 0x%08x\n", offs, val);
+ }
+
+ seq_puts(s, "\nI2C and INTR REGISTERS:\n");
+ for (offs = DFLL_I2C_CFG; offs <= DFLL_I2C_STS; offs += 4)
+ seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
+ dfll_i2c_readl(td, offs));
+ for (offs = DFLL_INTR_STS; offs <= DFLL_INTR_EN; offs += 4)
+ seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
+ dfll_i2c_readl(td, offs));
+
+ seq_puts(s, "\nINTEGRATED I2C CONTROLLER REGISTERS:\n");
+ offs = DFLL_I2C_CLK_DIVISOR;
+ seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
+ __raw_readl(td->i2c_controller_base + offs));
+
+ seq_puts(s, "\nLUT:\n");
+ for (offs = 0; offs < 4 * MAX_DFLL_VOLTAGES; offs += 4)
+ seq_printf(s, "[0x%02x] = 0x%08x\n", offs,
+ __raw_readl(td->lut_base + offs));
+
+ return 0;
+}
+
+static int attr_registers_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, attr_registers_show, inode->i_private);
+}
+
+static const struct file_operations attr_registers_fops = {
+ .open = attr_registers_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int dfll_debug_init(struct tegra_dfll *td)
+{
+ int ret;
+
+ if (!td || (td->mode == DFLL_UNINITIALIZED))
+ return 0;
+
+ td->debugfs_dir = debugfs_create_dir("tegra_dfll_fcpu", NULL);
+ if (!td->debugfs_dir)
+ return -ENOMEM;
+
+ ret = -ENOMEM;
+
+ if (!debugfs_create_file("enable", S_IRUGO | S_IWUSR,
+ td->debugfs_dir, td, &enable_fops))
+ goto err_out;
+
+ if (!debugfs_create_file("lock", S_IRUGO,
+ td->debugfs_dir, td, &lock_fops))
+ goto err_out;
+
+ if (!debugfs_create_file("rate", S_IRUGO,
+ td->debugfs_dir, td, &rate_fops))
+ goto err_out;
+
+ if (!debugfs_create_file("registers", S_IRUGO,
+ td->debugfs_dir, td, &attr_registers_fops))
+ goto err_out;
+
+ return 0;
+
+err_out:
+ debugfs_remove_recursive(td->debugfs_dir);
+ return ret;
+}
+
+#endif /* CONFIG_DEBUG_FS */
+
+/*
+ * DFLL initialization
+ */
+
+/**
+ * dfll_set_default_params - program non-output related DFLL parameters
+ * @td: DFLL instance
+ *
+ * During DFLL driver initialization or resume from context loss,
+ * program parameters for the closed loop integrator, DVCO tuning,
+ * voltage droop control and monitor control.
+ */
+static void dfll_set_default_params(struct tegra_dfll *td)
+{
+ u32 val;
+
+ val = DIV_ROUND_UP(td->ref_rate, td->sample_rate * 32);
+ BUG_ON(val > DFLL_CONFIG_DIV_MASK);
+ dfll_writel(td, val, DFLL_CONFIG);
+
+ val = (td->force_mode << DFLL_PARAMS_FORCE_MODE_SHIFT) |
+ (td->cf << DFLL_PARAMS_CF_PARAM_SHIFT) |
+ (td->ci << DFLL_PARAMS_CI_PARAM_SHIFT) |
+ (td->cg << DFLL_PARAMS_CG_PARAM_SHIFT) |
+ (td->cg_scale ? DFLL_PARAMS_CG_SCALE : 0);
+ dfll_writel(td, val, DFLL_PARAMS);
+
+ dfll_tune_low(td);
+ dfll_writel(td, td->droop_ctrl, DFLL_DROOP_CTRL);
+ dfll_writel(td, DFLL_MONITOR_CTRL_FREQ, DFLL_MONITOR_CTRL);
+}
+
+/**
+ * dfll_init_clks - clk_get() the DFLL source clocks
+ * @td: DFLL instance
+ *
+ * Call clk_get() on the DFLL source clocks and save the pointers for later
+ * use. Returns 0 upon success or error (see devm_clk_get) if one or more
+ * of the clocks couldn't be looked up.
+ */
+static int dfll_init_clks(struct tegra_dfll *td)
+{
+ td->ref_clk = devm_clk_get(td->dev, "ref");
+ if (IS_ERR(td->ref_clk)) {
+ dev_err(td->dev, "missing ref clock\n");
+ return PTR_ERR(td->ref_clk);
+ }
+
+ td->soc_clk = devm_clk_get(td->dev, "soc");
+ if (IS_ERR(td->soc_clk)) {
+ dev_err(td->dev, "missing soc clock\n");
+ return PTR_ERR(td->soc_clk);
+ }
+
+ td->i2c_clk = devm_clk_get(td->dev, "i2c");
+ if (IS_ERR(td->i2c_clk)) {
+ dev_err(td->dev, "missing i2c clock\n");
+ return PTR_ERR(td->i2c_clk);
+ }
+ td->i2c_clk_rate = clk_get_rate(td->i2c_clk);
+
+ return 0;
+}
+
+/**
+ * dfll_init - Prepare the DFLL IP block for use
+ * @td: DFLL instance
+ *
+ * Do everything necessary to prepare the DFLL IP block for use. The
+ * DFLL will be left in DISABLED state. Called by dfll_probe().
+ * Returns 0 upon success, or passes along the error from whatever
+ * function returned it.
+ */
+static int dfll_init(struct tegra_dfll *td)
+{
+ int ret;
+
+ td->ref_rate = clk_get_rate(td->ref_clk);
+ if (td->ref_rate != REF_CLOCK_RATE) {
+ dev_err(td->dev, "unexpected ref clk rate %lu, expecting %lu",
+ td->ref_rate, REF_CLOCK_RATE);
+ return -EINVAL;
+ }
+
+ reset_control_deassert(td->dvco_rst);
+
+ ret = clk_prepare(td->ref_clk);
+ if (ret) {
+ dev_err(td->dev, "failed to prepare ref_clk\n");
+ return ret;
+ }
+
+ ret = clk_prepare(td->soc_clk);
+ if (ret) {
+ dev_err(td->dev, "failed to prepare soc_clk\n");
+ goto di_err1;
+ }
+
+ ret = clk_prepare(td->i2c_clk);
+ if (ret) {
+ dev_err(td->dev, "failed to prepare i2c_clk\n");
+ goto di_err2;
+ }
+
+ td->last_unrounded_rate = 0;
+
+ pm_runtime_enable(td->dev);
+ pm_runtime_get_sync(td->dev);
+
+ dfll_set_mode(td, DFLL_DISABLED);
+ dfll_set_default_params(td);
+
+ if (td->soc->init_clock_trimmers)
+ td->soc->init_clock_trimmers();
+
+ dfll_set_open_loop_config(td);
+
+ dfll_init_out_if(td);
+
+ pm_runtime_put_sync(td->dev);
+
+ return 0;
+
+di_err2:
+ clk_unprepare(td->soc_clk);
+di_err1:
+ clk_unprepare(td->ref_clk);
+
+ reset_control_assert(td->dvco_rst);
+
+ return ret;
+}
+
+/*
+ * DT data fetch
+ */
+
+/*
+ * Find a PMIC voltage register-to-voltage mapping for the given voltage.
+ * An exact voltage match is required.
+ */
+static int find_vdd_map_entry_exact(struct tegra_dfll *td, int uV)
+{
+ int i, n_voltages, reg_uV;
+
+ n_voltages = regulator_count_voltages(td->vdd_reg);
+ for (i = 0; i < n_voltages; i++) {
+ reg_uV = regulator_list_voltage(td->vdd_reg, i);
+ if (reg_uV < 0)
+ break;
+
+ if (uV == reg_uV)
+ return i;
+ }
+
+ dev_err(td->dev, "no voltage map entry for %d uV\n", uV);
+ return -EINVAL;
+}
+
+/*
+ * Find a PMIC voltage register-to-voltage mapping for the given voltage,
+ * rounding up to the closest supported voltage.
+ * */
+static int find_vdd_map_entry_min(struct tegra_dfll *td, int uV)
+{
+ int i, n_voltages, reg_uV;
+
+ n_voltages = regulator_count_voltages(td->vdd_reg);
+ for (i = 0; i < n_voltages; i++) {
+ reg_uV = regulator_list_voltage(td->vdd_reg, i);
+ if (reg_uV < 0)
+ break;
+
+ if (uV <= reg_uV)
+ return i;
+ }
+
+ dev_err(td->dev, "no voltage map entry rounding to %d uV\n", uV);
+ return -EINVAL;
+}
+
+/**
+ * dfll_build_i2c_lut - build the I2C voltage register lookup table
+ * @td: DFLL instance
+ *
+ * The DFLL hardware has 33 bytes of look-up table RAM that must be filled with
+ * PMIC voltage register values that span the entire DFLL operating range.
+ * This function builds the look-up table based on the OPP table provided by
+ * the soc-specific platform driver (td->soc->opp_dev) and the PMIC
+ * register-to-voltage mapping queried from the regulator framework.
+ *
+ * On success, fills in td->i2c_lut and returns 0, or -err on failure.
+ */
+static int dfll_build_i2c_lut(struct tegra_dfll *td)
+{
+ int ret = -EINVAL;
+ int j, v, v_max, v_opp;
+ int selector;
+ unsigned long rate;
+ struct dev_pm_opp *opp;
+
+ rcu_read_lock();
+
+ rate = ULONG_MAX;
+ opp = dev_pm_opp_find_freq_floor(td->soc->dev, &rate);
+ if (IS_ERR(opp)) {
+ dev_err(td->dev, "couldn't get vmax opp, empty opp table?\n");
+ goto out;
+ }
+ v_max = dev_pm_opp_get_voltage(opp);
+
+ v = td->soc->min_millivolts * 1000;
+ td->i2c_lut[0] = find_vdd_map_entry_exact(td, v);
+ if (td->i2c_lut[0] < 0)
+ goto out;
+
+ for (j = 1, rate = 0; ; rate++) {
+ opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
+ if (IS_ERR(opp))
+ break;
+ v_opp = dev_pm_opp_get_voltage(opp);
+
+ if (v_opp <= td->soc->min_millivolts * 1000)
+ td->dvco_rate_min = dev_pm_opp_get_freq(opp);
+
+ for (;;) {
+ v += max(1, (v_max - v) / (MAX_DFLL_VOLTAGES - j));
+ if (v >= v_opp)
+ break;
+
+ selector = find_vdd_map_entry_min(td, v);
+ if (selector < 0)
+ goto out;
+ if (selector != td->i2c_lut[j - 1])
+ td->i2c_lut[j++] = selector;
+ }
+
+ v = (j == MAX_DFLL_VOLTAGES - 1) ? v_max : v_opp;
+ selector = find_vdd_map_entry_exact(td, v);
+ if (selector < 0)
+ goto out;
+ if (selector != td->i2c_lut[j - 1])
+ td->i2c_lut[j++] = selector;
+
+ if (v >= v_max)
+ break;
+ }
+ td->i2c_lut_size = j;
+
+ if (!td->dvco_rate_min)
+ dev_err(td->dev, "no opp above DFLL minimum voltage %d mV\n",
+ td->soc->min_millivolts);
+ else
+ ret = 0;
+
+out:
+ rcu_read_unlock();
+
+ return ret;
+}
+
+/**
+ * read_dt_param - helper function for reading required parameters from the DT
+ * @td: DFLL instance
+ * @param: DT property name
+ * @dest: output pointer for the value read
+ *
+ * Read a required numeric parameter from the DFLL device node, or complain
+ * if the property doesn't exist. Returns a boolean indicating success for
+ * easy chaining of multiple calls to this function.
+ */
+static bool read_dt_param(struct tegra_dfll *td, const char *param, u32 *dest)
+{
+ int err = of_property_read_u32(td->dev->of_node, param, dest);
+
+ if (err < 0) {
+ dev_err(td->dev, "failed to read DT parameter %s: %d\n",
+ param, err);
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * dfll_fetch_i2c_params - query PMIC I2C params from DT & regulator subsystem
+ * @td: DFLL instance
+ *
+ * Read all the parameters required for operation in I2C mode. The parameters
+ * can originate from the device tree or the regulator subsystem.
+ * Returns 0 on success or -err on failure.
+ */
+static int dfll_fetch_i2c_params(struct tegra_dfll *td)
+{
+ struct regmap *regmap;
+ struct device *i2c_dev;
+ struct i2c_client *i2c_client;
+ int vsel_reg, vsel_mask;
+ int ret;
+
+ if (!read_dt_param(td, "nvidia,i2c-fs-rate", &td->i2c_fs_rate))
+ return -EINVAL;
+
+ regmap = regulator_get_regmap(td->vdd_reg);
+ i2c_dev = regmap_get_device(regmap);
+ i2c_client = to_i2c_client(i2c_dev);
+
+ td->i2c_slave_addr = i2c_client->addr;
+
+ ret = regulator_get_hardware_vsel_register(td->vdd_reg,
+ &vsel_reg,
+ &vsel_mask);
+ if (ret < 0) {
+ dev_err(td->dev,
+ "regulator unsuitable for DFLL I2C operation\n");
+ return -EINVAL;
+ }
+ td->i2c_reg = vsel_reg;
+
+ ret = dfll_build_i2c_lut(td);
+ if (ret) {
+ dev_err(td->dev, "couldn't build I2C LUT\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * dfll_fetch_common_params - read DFLL parameters from the device tree
+ * @td: DFLL instance
+ *
+ * Read all the DT parameters that are common to both I2C and PWM operation.
+ * Returns 0 on success or -EINVAL on any failure.
+ */
+static int dfll_fetch_common_params(struct tegra_dfll *td)
+{
+ bool ok = true;
+
+ ok &= read_dt_param(td, "nvidia,droop-ctrl", &td->droop_ctrl);
+ ok &= read_dt_param(td, "nvidia,sample-rate", &td->sample_rate);
+ ok &= read_dt_param(td, "nvidia,force-mode", &td->force_mode);
+ ok &= read_dt_param(td, "nvidia,cf", &td->cf);
+ ok &= read_dt_param(td, "nvidia,ci", &td->ci);
+ ok &= read_dt_param(td, "nvidia,cg", &td->cg);
+ td->cg_scale = of_property_read_bool(td->dev->of_node,
+ "nvidia,cg-scale");
+
+ if (of_property_read_string(td->dev->of_node, "clock-output-names",
+ &td->output_clock_name)) {
+ dev_err(td->dev, "missing clock-output-names property\n");
+ ok = false;
+ }
+
+ return ok ? 0 : -EINVAL;
+}
+
+/*
+ * API exported to per-SoC platform drivers
+ */
+
+/**
+ * tegra_dfll_register - probe a Tegra DFLL device
+ * @pdev: DFLL platform_device *
+ * @soc: Per-SoC integration and characterization data for this DFLL instance
+ *
+ * Probe and initialize a DFLL device instance. Intended to be called
+ * by a SoC-specific shim driver that passes in per-SoC integration
+ * and configuration data via @soc. Returns 0 on success or -err on failure.
+ */
+int tegra_dfll_register(struct platform_device *pdev,
+ struct tegra_dfll_soc_data *soc)
+{
+ struct resource *mem;
+ struct tegra_dfll *td;
+ int ret;
+
+ if (!soc) {
+ dev_err(&pdev->dev, "no tegra_dfll_soc_data provided\n");
+ return -EINVAL;
+ }
+
+ td = devm_kzalloc(&pdev->dev, sizeof(*td), GFP_KERNEL);
+ if (!td)
+ return -ENOMEM;
+ td->dev = &pdev->dev;
+ platform_set_drvdata(pdev, td);
+
+ td->soc = soc;
+
+ td->vdd_reg = devm_regulator_get(td->dev, "vdd-cpu");
+ if (IS_ERR(td->vdd_reg)) {
+ dev_err(td->dev, "couldn't get vdd_cpu regulator\n");
+ return PTR_ERR(td->vdd_reg);
+ }
+
+ td->dvco_rst = devm_reset_control_get(td->dev, "dvco");
+ if (IS_ERR(td->dvco_rst)) {
+ dev_err(td->dev, "couldn't get dvco reset\n");
+ return PTR_ERR(td->dvco_rst);
+ }
+
+ ret = dfll_fetch_common_params(td);
+ if (ret) {
+ dev_err(td->dev, "couldn't parse device tree parameters\n");
+ return ret;
+ }
+
+ ret = dfll_fetch_i2c_params(td);
+ if (ret)
+ return ret;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(td->dev, "no control register resource\n");
+ return -ENODEV;
+ }
+
+ td->base = devm_ioremap(td->dev, mem->start, resource_size(mem));
+ if (!td->base) {
+ dev_err(td->dev, "couldn't ioremap DFLL control registers\n");
+ return -ENODEV;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!mem) {
+ dev_err(td->dev, "no i2c_base resource\n");
+ return -ENODEV;
+ }
+
+ td->i2c_base = devm_ioremap(td->dev, mem->start, resource_size(mem));
+ if (!td->i2c_base) {
+ dev_err(td->dev, "couldn't ioremap i2c_base resource\n");
+ return -ENODEV;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ if (!mem) {
+ dev_err(td->dev, "no i2c_controller_base resource\n");
+ return -ENODEV;
+ }
+
+ td->i2c_controller_base = devm_ioremap(td->dev, mem->start,
+ resource_size(mem));
+ if (!td->i2c_controller_base) {
+ dev_err(td->dev,
+ "couldn't ioremap i2c_controller_base resource\n");
+ return -ENODEV;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 3);
+ if (!mem) {
+ dev_err(td->dev, "no lut_base resource\n");
+ return -ENODEV;
+ }
+
+ td->lut_base = devm_ioremap(td->dev, mem->start, resource_size(mem));
+ if (!td->lut_base) {
+ dev_err(td->dev,
+ "couldn't ioremap lut_base resource\n");
+ return -ENODEV;
+ }
+
+ ret = dfll_init_clks(td);
+ if (ret) {
+ dev_err(&pdev->dev, "DFLL clock init error\n");
+ return ret;
+ }
+
+ /* Enable the clocks and set the device up */
+ ret = dfll_init(td);
+ if (ret)
+ return ret;
+
+ ret = dfll_register_clk(td);
+ if (ret) {
+ dev_err(&pdev->dev, "DFLL clk registration failed\n");
+ return ret;
+ }
+
+#ifdef CONFIG_DEBUG_FS
+ dfll_debug_init(td);
+#endif
+
+ return 0;
+}
+EXPORT_SYMBOL(tegra_dfll_register);
+
+/**
+ * tegra_dfll_unregister - release all of the DFLL driver resources for a device
+ * @pdev: DFLL platform_device *
+ *
+ * Unbind this driver from the DFLL hardware device represented by
+ * @pdev. The DFLL must be disabled for this to succeed. Returns 0
+ * upon success or -EBUSY if the DFLL is still active.
+ */
+int tegra_dfll_unregister(struct platform_device *pdev)
+{
+ struct tegra_dfll *td = platform_get_drvdata(pdev);
+
+ /* Try to prevent removal while the DFLL is active */
+ if (td->mode != DFLL_DISABLED) {
+ dev_err(&pdev->dev,
+ "must disable DFLL before removing driver\n");
+ return -EBUSY;
+ }
+
+ debugfs_remove_recursive(td->debugfs_dir);
+
+ dfll_unregister_clk(td);
+ pm_runtime_disable(&pdev->dev);
+
+ clk_unprepare(td->ref_clk);
+ clk_unprepare(td->soc_clk);
+ clk_unprepare(td->i2c_clk);
+
+ reset_control_assert(td->dvco_rst);
+
+ return 0;
+}
+EXPORT_SYMBOL(tegra_dfll_unregister);
diff --git a/drivers/clk/tegra/clk-dfll.h b/drivers/clk/tegra/clk-dfll.h
new file mode 100644
index 0000000..2e4c077
--- /dev/null
+++ b/drivers/clk/tegra/clk-dfll.h
@@ -0,0 +1,54 @@
+/*
+ * clk-dfll.h - prototypes and macros for the Tegra DFLL clocksource driver
+ * Copyright (C) 2013 NVIDIA Corporation. All rights reserved.
+ *
+ * Aleksandr Frid <afrid@nvidia.com>
+ * Paul Walmsley <pwalmsley@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __DRIVERS_CLK_TEGRA_CLK_DFLL_H
+#define __DRIVERS_CLK_TEGRA_CLK_DFLL_H
+
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/types.h>
+
+/**
+ * struct tegra_dfll_soc_data - SoC-specific hooks/integration for the DFLL driver
+ * @opp_dev: struct device * that holds the OPP table for the DFLL
+ * @min_millivolts: minimum voltage (in mV) that the DFLL can operate
+ * @tune0_low: DFLL tuning register 0 (low voltage range)
+ * @tune0_high: DFLL tuning register 0 (high voltage range)
+ * @tune1: DFLL tuning register 1
+ * @assert_dvco_reset: fn ptr to place the DVCO in reset
+ * @deassert_dvco_reset: fn ptr to release the DVCO reset
+ * @set_clock_trimmers_high: fn ptr to tune clock trimmers for high voltage
+ * @set_clock_trimmers_low: fn ptr to tune clock trimmers for low voltage
+ */
+struct tegra_dfll_soc_data {
+ struct device *dev;
+ unsigned int min_millivolts;
+ u32 tune0_low;
+ u32 tune0_high;
+ u32 tune1;
+ void (*init_clock_trimmers)(void);
+ void (*set_clock_trimmers_high)(void);
+ void (*set_clock_trimmers_low)(void);
+};
+
+int tegra_dfll_register(struct platform_device *pdev,
+ struct tegra_dfll_soc_data *soc);
+int tegra_dfll_unregister(struct platform_device *pdev);
+int tegra_dfll_runtime_suspend(struct device *dev);
+int tegra_dfll_runtime_resume(struct device *dev);
+
+#endif /* __DRIVERS_CLK_TEGRA_CLK_DFLL_H */
diff --git a/drivers/clk/tegra/clk-tegra-super-gen4.c b/drivers/clk/tegra/clk-tegra-super-gen4.c
index ecd7ff7..5b1d723 100644
--- a/drivers/clk/tegra/clk-tegra-super-gen4.c
+++ b/drivers/clk/tegra/clk-tegra-super-gen4.c
@@ -43,7 +43,9 @@
static const char *cclk_g_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
"pll_p", "pll_p_out4", "unused",
- "unused", "pll_x" };
+ "unused", "pll_x", "unused", "unused",
+ "unused", "unused", "unused", "unused",
+ "dfllCPU_out" };
static const char *cclk_lp_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
"pll_p", "pll_p_out4", "unused",
diff --git a/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c b/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
new file mode 100644
index 0000000..6125333
--- /dev/null
+++ b/drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
@@ -0,0 +1,166 @@
+/*
+ * Tegra124 DFLL FCPU clock source driver
+ *
+ * Copyright (C) 2012-2014 NVIDIA Corporation. All rights reserved.
+ *
+ * Aleksandr Frid <afrid@nvidia.com>
+ * Paul Walmsley <pwalmsley@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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/cpu.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <soc/tegra/fuse.h>
+
+#include "clk.h"
+#include "clk-dfll.h"
+#include "cvb.h"
+
+/* Maximum CPU frequency, indexed by CPU speedo id */
+static const unsigned long cpu_max_freq_table[] = {
+ [0] = 2014500000UL,
+ [1] = 2320500000UL,
+ [2] = 2116500000UL,
+ [3] = 2524500000UL,
+};
+
+static const struct cvb_table tegra124_cpu_cvb_tables[] = {
+ {
+ .speedo_id = -1,
+ .process_id = -1,
+ .min_millivolts = 900,
+ .max_millivolts = 1260,
+ .alignment = {
+ .step_uv = 10000, /* 10mV */
+ },
+ .speedo_scale = 100,
+ .voltage_scale = 1000,
+ .cvb_table = {
+ {204000000UL, {1112619, -29295, 402} },
+ {306000000UL, {1150460, -30585, 402} },
+ {408000000UL, {1190122, -31865, 402} },
+ {510000000UL, {1231606, -33155, 402} },
+ {612000000UL, {1274912, -34435, 402} },
+ {714000000UL, {1320040, -35725, 402} },
+ {816000000UL, {1366990, -37005, 402} },
+ {918000000UL, {1415762, -38295, 402} },
+ {1020000000UL, {1466355, -39575, 402} },
+ {1122000000UL, {1518771, -40865, 402} },
+ {1224000000UL, {1573009, -42145, 402} },
+ {1326000000UL, {1629068, -43435, 402} },
+ {1428000000UL, {1686950, -44715, 402} },
+ {1530000000UL, {1746653, -46005, 402} },
+ {1632000000UL, {1808179, -47285, 402} },
+ {1734000000UL, {1871526, -48575, 402} },
+ {1836000000UL, {1936696, -49855, 402} },
+ {1938000000UL, {2003687, -51145, 402} },
+ {2014500000UL, {2054787, -52095, 402} },
+ {2116500000UL, {2124957, -53385, 402} },
+ {2218500000UL, {2196950, -54665, 402} },
+ {2320500000UL, {2270765, -55955, 402} },
+ {2422500000UL, {2346401, -57235, 402} },
+ {2524500000UL, {2437299, -58535, 402} },
+ {0, { 0, 0, 0} },
+ },
+ .cpu_dfll_data = {
+ .tune0_low = 0x005020ff,
+ .tune0_high = 0x005040ff,
+ .tune1 = 0x00000060,
+ }
+ },
+};
+
+static int tegra124_dfll_fcpu_probe(struct platform_device *pdev)
+{
+ int process_id, speedo_id, speedo_value;
+ struct tegra_dfll_soc_data *soc;
+ const struct cvb_table *cvb;
+
+ process_id = tegra_sku_info.cpu_process_id;
+ speedo_id = tegra_sku_info.cpu_speedo_id;
+ speedo_value = tegra_sku_info.cpu_speedo_value;
+
+ if (speedo_id >= ARRAY_SIZE(cpu_max_freq_table)) {
+ dev_err(&pdev->dev, "unknown max CPU freq for speedo_id=%d\n",
+ speedo_id);
+ return -ENODEV;
+ }
+
+ soc = devm_kzalloc(&pdev->dev, sizeof(*soc), GFP_KERNEL);
+ if (!soc)
+ return -ENOMEM;
+
+ soc->dev = get_cpu_device(0);
+ if (!soc->dev) {
+ dev_err(&pdev->dev, "no CPU0 device\n");
+ return -ENODEV;
+ }
+
+ cvb = tegra_cvb_build_opp_table(tegra124_cpu_cvb_tables,
+ ARRAY_SIZE(tegra124_cpu_cvb_tables),
+ process_id, speedo_id, speedo_value,
+ cpu_max_freq_table[speedo_id],
+ soc->dev);
+ if (IS_ERR(cvb)) {
+ dev_err(&pdev->dev, "couldn't build OPP table: %ld\n",
+ PTR_ERR(cvb));
+ return PTR_ERR(cvb);
+ }
+
+ soc->min_millivolts = cvb->min_millivolts;
+ soc->tune0_low = cvb->cpu_dfll_data.tune0_low;
+ soc->tune0_high = cvb->cpu_dfll_data.tune0_high;
+ soc->tune1 = cvb->cpu_dfll_data.tune1;
+
+ return tegra_dfll_register(pdev, soc);
+}
+
+static const struct of_device_id tegra124_dfll_fcpu_of_match[] = {
+ { .compatible = "nvidia,tegra124-dfll", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra124_dfll_fcpu_of_match);
+
+static const struct dev_pm_ops tegra124_dfll_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra_dfll_runtime_suspend,
+ tegra_dfll_runtime_resume, NULL)
+};
+
+static struct platform_driver tegra124_dfll_fcpu_driver = {
+ .probe = tegra124_dfll_fcpu_probe,
+ .remove = tegra_dfll_unregister,
+ .driver = {
+ .name = "tegra124-dfll",
+ .of_match_table = tegra124_dfll_fcpu_of_match,
+ .pm = &tegra124_dfll_pm_ops,
+ },
+};
+
+static int __init tegra124_dfll_fcpu_init(void)
+{
+ return platform_driver_register(&tegra124_dfll_fcpu_driver);
+}
+module_init(tegra124_dfll_fcpu_init);
+
+static void __exit tegra124_dfll_fcpu_exit(void)
+{
+ platform_driver_unregister(&tegra124_dfll_fcpu_driver);
+}
+module_exit(tegra124_dfll_fcpu_exit);
+
+MODULE_DESCRIPTION("Tegra124 DFLL clock source driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Aleksandr Frid <afrid@nvidia.com>");
+MODULE_AUTHOR("Paul Walmsley <pwalmsley@nvidia.com>");
diff --git a/drivers/clk/tegra/clk-tegra124.c b/drivers/clk/tegra/clk-tegra124.c
index 0c44cc7..a9e2b30 100644
--- a/drivers/clk/tegra/clk-tegra124.c
+++ b/drivers/clk/tegra/clk-tegra124.c
@@ -23,6 +23,7 @@
#include <linux/export.h>
#include <linux/clk/tegra.h>
#include <dt-bindings/clock/tegra124-car.h>
+#include <dt-bindings/reset/tegra124-car.h>
#include "clk.h"
#include "clk-id.h"
@@ -38,6 +39,9 @@
#define CLK_SOURCE_CSITE 0x1d4
#define CLK_SOURCE_EMC 0x19c
+#define RST_DFLL_DVCO 0x2f4
+#define DVFS_DFLL_RESET_SHIFT 0
+
#define PLLC_BASE 0x80
#define PLLC_OUT 0x84
#define PLLC_MISC2 0x88
@@ -93,6 +97,8 @@
#define PMC_PLLM_WB0_OVERRIDE 0x1dc
#define PMC_PLLM_WB0_OVERRIDE_2 0x2b0
+#define CCLKG_BURST_POLICY 0x368
+
#define UTMIP_PLL_CFG2 0x488
#define UTMIP_PLL_CFG2_STABLE_COUNT(x) (((x) & 0xffff) << 6)
#define UTMIP_PLL_CFG2_ACTIVE_DLY_COUNT(x) (((x) & 0x3f) << 18)
@@ -125,6 +131,8 @@
#ifdef CONFIG_PM_SLEEP
static struct cpu_clk_suspend_context {
u32 clk_csite_src;
+ u32 cclkg_burst;
+ u32 cclkg_divider;
} tegra124_cpu_clk_sctx;
#endif
@@ -1318,12 +1326,22 @@
tegra124_cpu_clk_sctx.clk_csite_src =
readl(clk_base + CLK_SOURCE_CSITE);
writel(3 << 30, clk_base + CLK_SOURCE_CSITE);
+
+ tegra124_cpu_clk_sctx.cclkg_burst =
+ readl(clk_base + CCLKG_BURST_POLICY);
+ tegra124_cpu_clk_sctx.cclkg_divider =
+ readl(clk_base + CCLKG_BURST_POLICY + 4);
}
static void tegra124_cpu_clock_resume(void)
{
writel(tegra124_cpu_clk_sctx.clk_csite_src,
clk_base + CLK_SOURCE_CSITE);
+
+ writel(tegra124_cpu_clk_sctx.cclkg_burst,
+ clk_base + CCLKG_BURST_POLICY);
+ writel(tegra124_cpu_clk_sctx.cclkg_divider,
+ clk_base + CCLKG_BURST_POLICY + 4);
}
#endif
@@ -1414,6 +1432,68 @@
}
/**
+ * tegra124_car_barrier - wait for pending writes to the CAR to complete
+ *
+ * Wait for any outstanding writes to the CAR MMIO space from this CPU
+ * to complete before continuing execution. No return value.
+ */
+static void tegra124_car_barrier(void)
+{
+ readl_relaxed(clk_base + RST_DFLL_DVCO);
+}
+
+/**
+ * tegra124_clock_assert_dfll_dvco_reset - assert the DFLL's DVCO reset
+ *
+ * Assert the reset line of the DFLL's DVCO. No return value.
+ */
+void tegra124_clock_assert_dfll_dvco_reset(void)
+{
+ u32 v;
+
+ v = readl_relaxed(clk_base + RST_DFLL_DVCO);
+ v |= (1 << DVFS_DFLL_RESET_SHIFT);
+ writel_relaxed(v, clk_base + RST_DFLL_DVCO);
+ tegra124_car_barrier();
+}
+
+/**
+ * tegra124_clock_deassert_dfll_dvco_reset - deassert the DFLL's DVCO reset
+ *
+ * Deassert the reset line of the DFLL's DVCO, allowing the DVCO to
+ * operate. No return value.
+ */
+void tegra124_clock_deassert_dfll_dvco_reset(void)
+{
+ u32 v;
+
+ v = readl_relaxed(clk_base + RST_DFLL_DVCO);
+ v &= ~(1 << DVFS_DFLL_RESET_SHIFT);
+ writel_relaxed(v, clk_base + RST_DFLL_DVCO);
+ tegra124_car_barrier();
+}
+
+int tegra124_reset_assert(unsigned long id)
+{
+ if (id == TEGRA124_RST_DFLL_DVCO)
+ tegra124_clock_assert_dfll_dvco_reset();
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+int tegra124_reset_deassert(unsigned long id)
+{
+ if (id == TEGRA124_RST_DFLL_DVCO)
+ tegra124_clock_deassert_dfll_dvco_reset();
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
* tegra132_clock_apply_init_table - initialize clocks on Tegra132 SoCs
*
* Program an initial clock rate and enable or disable clocks needed
@@ -1498,6 +1578,8 @@
{
tegra_super_clk_gen4_init(clk_base, pmc_base, tegra124_clks,
&pll_x_params);
+ tegra_init_special_resets(1, tegra124_reset_assert,
+ tegra124_reset_deassert);
tegra_add_of_provider(np);
clks[TEGRA124_CLK_EMC] = tegra_clk_register_emc(clk_base, np,
diff --git a/drivers/clk/tegra/clk.c b/drivers/clk/tegra/clk.c
index 22aa8b1..2a3a4fe 100644
--- a/drivers/clk/tegra/clk.c
+++ b/drivers/clk/tegra/clk.c
@@ -50,7 +50,6 @@
#define RST_DEVICES_L 0x004
#define RST_DEVICES_H 0x008
#define RST_DEVICES_U 0x00C
-#define RST_DFLL_DVCO 0x2F4
#define RST_DEVICES_V 0x358
#define RST_DEVICES_W 0x35C
#define RST_DEVICES_X 0x28C
@@ -80,6 +79,11 @@
static int clk_num;
static struct clk_onecell_data clk_data;
+/* Handlers for SoC-specific reset lines */
+static int (*special_reset_assert)(unsigned long);
+static int (*special_reset_deassert)(unsigned long);
+static unsigned int num_special_reset;
+
static struct tegra_clk_periph_regs periph_regs[] = {
[0] = {
.enb_reg = CLK_OUT_ENB_L,
@@ -153,19 +157,29 @@
*/
tegra_read_chipid();
- writel_relaxed(BIT(id % 32),
- clk_base + periph_regs[id / 32].rst_set_reg);
+ if (id < periph_banks * 32) {
+ writel_relaxed(BIT(id % 32),
+ clk_base + periph_regs[id / 32].rst_set_reg);
+ return 0;
+ } else if (id < periph_banks * 32 + num_special_reset) {
+ return special_reset_assert(id);
+ }
- return 0;
+ return -EINVAL;
}
static int tegra_clk_rst_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
- writel_relaxed(BIT(id % 32),
- clk_base + periph_regs[id / 32].rst_clr_reg);
+ if (id < periph_banks * 32) {
+ writel_relaxed(BIT(id % 32),
+ clk_base + periph_regs[id / 32].rst_clr_reg);
+ return 0;
+ } else if (id < periph_banks * 32 + num_special_reset) {
+ return special_reset_deassert(id);
+ }
- return 0;
+ return -EINVAL;
}
struct tegra_clk_periph_regs *get_reg_bank(int clkid)
@@ -287,10 +301,19 @@
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
rst_ctlr.of_node = np;
- rst_ctlr.nr_resets = periph_banks * 32;
+ rst_ctlr.nr_resets = periph_banks * 32 + num_special_reset;
reset_controller_register(&rst_ctlr);
}
+void __init tegra_init_special_resets(unsigned int num,
+ int (*assert)(unsigned long),
+ int (*deassert)(unsigned long))
+{
+ num_special_reset = num;
+ special_reset_assert = assert;
+ special_reset_deassert = deassert;
+}
+
void __init tegra_register_devclks(struct tegra_devclk *dev_clks, int num)
{
int i;
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index 75ddc8ff..0621887 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -591,6 +591,9 @@
char *con_id;
};
+void tegra_init_special_resets(unsigned int num, int (*assert)(unsigned long),
+ int (*deassert)(unsigned long));
+
void tegra_init_from_table(struct tegra_clk_init_table *tbl,
struct clk *clks[], int clk_max);
diff --git a/drivers/clk/tegra/cvb.c b/drivers/clk/tegra/cvb.c
new file mode 100644
index 0000000..0204e08
--- /dev/null
+++ b/drivers/clk/tegra/cvb.c
@@ -0,0 +1,140 @@
+/*
+ * Utility functions for parsing Tegra CVB voltage tables
+ *
+ * Copyright (C) 2012-2014 NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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/err.h>
+#include <linux/kernel.h>
+#include <linux/pm_opp.h>
+
+#include "cvb.h"
+
+/* cvb_mv = ((c2 * speedo / s_scale + c1) * speedo / s_scale + c0) */
+static inline int get_cvb_voltage(int speedo, int s_scale,
+ const struct cvb_coefficients *cvb)
+{
+ int mv;
+
+ /* apply only speedo scale: output mv = cvb_mv * v_scale */
+ mv = DIV_ROUND_CLOSEST(cvb->c2 * speedo, s_scale);
+ mv = DIV_ROUND_CLOSEST((mv + cvb->c1) * speedo, s_scale) + cvb->c0;
+ return mv;
+}
+
+static int round_cvb_voltage(int mv, int v_scale,
+ const struct rail_alignment *align)
+{
+ /* combined: apply voltage scale and round to cvb alignment step */
+ int uv;
+ int step = (align->step_uv ? : 1000) * v_scale;
+ int offset = align->offset_uv * v_scale;
+
+ uv = max(mv * 1000, offset) - offset;
+ uv = DIV_ROUND_UP(uv, step) * align->step_uv + align->offset_uv;
+ return uv / 1000;
+}
+
+enum {
+ DOWN,
+ UP
+};
+
+static int round_voltage(int mv, const struct rail_alignment *align, int up)
+{
+ if (align->step_uv) {
+ int uv;
+
+ uv = max(mv * 1000, align->offset_uv) - align->offset_uv;
+ uv = (uv + (up ? align->step_uv - 1 : 0)) / align->step_uv;
+ return (uv * align->step_uv + align->offset_uv) / 1000;
+ }
+ return mv;
+}
+
+static int build_opp_table(const struct cvb_table *d,
+ int speedo_value,
+ unsigned long max_freq,
+ struct device *opp_dev)
+{
+ int i, ret, dfll_mv, min_mv, max_mv;
+ const struct cvb_table_freq_entry *table = NULL;
+ const struct rail_alignment *align = &d->alignment;
+
+ min_mv = round_voltage(d->min_millivolts, align, UP);
+ max_mv = round_voltage(d->max_millivolts, align, DOWN);
+
+ for (i = 0; i < MAX_DVFS_FREQS; i++) {
+ table = &d->cvb_table[i];
+ if (!table->freq || (table->freq > max_freq))
+ break;
+
+ /*
+ * FIXME after clk_round_rate/clk_determine_rate prototypes
+ * have been updated
+ */
+ if (table->freq & (1<<31))
+ continue;
+
+ dfll_mv = get_cvb_voltage(
+ speedo_value, d->speedo_scale, &table->coefficients);
+ dfll_mv = round_cvb_voltage(dfll_mv, d->voltage_scale, align);
+ dfll_mv = clamp(dfll_mv, min_mv, max_mv);
+
+ ret = dev_pm_opp_add(opp_dev, table->freq, dfll_mv * 1000);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * tegra_cvb_build_opp_table - build OPP table from Tegra CVB tables
+ * @cvb_tables: array of CVB tables
+ * @sz: size of the previously mentioned array
+ * @process_id: process id of the HW module
+ * @speedo_id: speedo id of the HW module
+ * @speedo_value: speedo value of the HW module
+ * @max_rate: highest safe clock rate
+ * @opp_dev: the struct device * for which the OPP table is built
+ *
+ * On Tegra, a CVB table encodes the relationship between operating voltage
+ * and safe maximal frequency for a given module (e.g. GPU or CPU). This
+ * function calculates the optimal voltage-frequency operating points
+ * for the given arguments and exports them via the OPP library for the
+ * given @opp_dev. Returns a pointer to the struct cvb_table that matched
+ * or an ERR_PTR on failure.
+ */
+const struct cvb_table *tegra_cvb_build_opp_table(
+ const struct cvb_table *cvb_tables,
+ size_t sz, int process_id,
+ int speedo_id, int speedo_value,
+ unsigned long max_rate,
+ struct device *opp_dev)
+{
+ int i, ret;
+
+ for (i = 0; i < sz; i++) {
+ const struct cvb_table *d = &cvb_tables[i];
+
+ if (d->speedo_id != -1 && d->speedo_id != speedo_id)
+ continue;
+ if (d->process_id != -1 && d->process_id != process_id)
+ continue;
+
+ ret = build_opp_table(d, speedo_value, max_rate, opp_dev);
+ return ret ? ERR_PTR(ret) : d;
+ }
+
+ return ERR_PTR(-EINVAL);
+}
diff --git a/drivers/clk/tegra/cvb.h b/drivers/clk/tegra/cvb.h
new file mode 100644
index 0000000..f62cdc4
--- /dev/null
+++ b/drivers/clk/tegra/cvb.h
@@ -0,0 +1,67 @@
+/*
+ * Utility functions for parsing Tegra CVB voltage tables
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ */
+
+#ifndef __DRIVERS_CLK_TEGRA_CVB_H
+#define __DRIVERS_CLK_TEGRA_CVB_H
+
+#include <linux/types.h>
+
+struct device;
+
+#define MAX_DVFS_FREQS 40
+
+struct rail_alignment {
+ int offset_uv;
+ int step_uv;
+};
+
+struct cvb_coefficients {
+ int c0;
+ int c1;
+ int c2;
+};
+
+struct cvb_table_freq_entry {
+ unsigned long freq;
+ struct cvb_coefficients coefficients;
+};
+
+struct cvb_cpu_dfll_data {
+ u32 tune0_low;
+ u32 tune0_high;
+ u32 tune1;
+};
+
+struct cvb_table {
+ int speedo_id;
+ int process_id;
+
+ int min_millivolts;
+ int max_millivolts;
+ struct rail_alignment alignment;
+
+ int speedo_scale;
+ int voltage_scale;
+ struct cvb_table_freq_entry cvb_table[MAX_DVFS_FREQS];
+ struct cvb_cpu_dfll_data cpu_dfll_data;
+};
+
+const struct cvb_table *tegra_cvb_build_opp_table(
+ const struct cvb_table *cvb_tables,
+ size_t sz, int process_id,
+ int speedo_id, int speedo_value,
+ unsigned long max_rate,
+ struct device *opp_dev);
+
+#endif
diff --git a/include/dt-bindings/reset/tegra124-car.h b/include/dt-bindings/reset/tegra124-car.h
new file mode 100644
index 0000000..070e4f6
--- /dev/null
+++ b/include/dt-bindings/reset/tegra124-car.h
@@ -0,0 +1,12 @@
+/*
+ * This header provides Tegra124-specific constants for binding
+ * nvidia,tegra124-car.
+ */
+
+#ifndef _DT_BINDINGS_RESET_TEGRA124_CAR_H
+#define _DT_BINDINGS_RESET_TEGRA124_CAR_H
+
+#define TEGRA124_RESET(x) (6 * 32 + (x))
+#define TEGRA124_RST_DFLL_DVCO TEGRA124_RESET(0)
+
+#endif /* _DT_BINDINGS_RESET_TEGRA124_CAR_H */