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@@ -0,0 +1,570 @@
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+--- a/drivers/regulator/Kconfig
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++++ b/drivers/regulator/Kconfig
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+@@ -450,6 +450,14 @@ config REGULATOR_MT6397
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+ This driver supports the control of different power rails of device
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+ through regulator interface.
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+
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++config REGULATOR_MXS
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++ tristate "Freescale MXS on-chip regulators"
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++ depends on (MXS_POWER || COMPILE_TEST)
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++ help
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++ Say y here to support Freescale MXS on-chip regulators.
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++ It is recommended that this option be enabled on i.MX23,
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++ i.MX28 platform.
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++
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+ config REGULATOR_PALMAS
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+ tristate "TI Palmas PMIC Regulators"
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+ depends on MFD_PALMAS
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+--- a/drivers/regulator/Makefile
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++++ b/drivers/regulator/Makefile
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+@@ -60,6 +60,7 @@ obj-$(CONFIG_REGULATOR_MC13783) += mc137
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+ obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
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+ obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o
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+ obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o
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++obj-$(CONFIG_REGULATOR_MXS) += mxs-regulator.o
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+ obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
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+ obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
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+ obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
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+--- /dev/null
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++++ b/drivers/regulator/mxs-regulator.c
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+@@ -0,0 +1,540 @@
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++/*
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++ * Freescale MXS on-chip regulators
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++ *
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++ * Embedded Alley Solutions, Inc <[email protected]>
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++ *
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++ * Copyright (C) 2014 Stefan Wahren
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++ * Copyright (C) 2010 Freescale Semiconductor, Inc.
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++ * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
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++ *
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++ * Inspired by imx-bootlets
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++ */
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++
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++/*
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++ * The code contained herein is licensed under the GNU General Public
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++ * License. You may obtain a copy of the GNU General Public License
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++ * Version 2 or later at the following locations:
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++ *
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++ * http://www.opensource.org/licenses/gpl-license.html
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++ * http://www.gnu.org/copyleft/gpl.html
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++ */
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++
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++#include <linux/delay.h>
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++#include <linux/device.h>
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++#include <linux/err.h>
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++#include <linux/kernel.h>
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++#include <linux/mfd/syscon.h>
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++#include <linux/module.h>
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++#include <linux/of.h>
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++#include <linux/of_device.h>
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++#include <linux/platform_device.h>
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++#include <linux/regmap.h>
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++#include <linux/regulator/driver.h>
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++#include <linux/regulator/machine.h>
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++#include <linux/regulator/of_regulator.h>
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++#include <linux/slab.h>
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++
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++/* Powered by linear regulator. DCDC output is gated off and
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++ the linreg output is equal to the target. */
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++#define HW_POWER_LINREG_DCDC_OFF 1
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++
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++/* Powered by linear regulator. DCDC output is not gated off
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++ and is ready for the automatic hardware transistion after a 5V
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++ event. The converters are not enabled when 5V is present. LinReg output
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++ is 25mV below target. */
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++#define HW_POWER_LINREG_DCDC_READY 2
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++
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++/* Powered by DCDC converter and the LinReg is on. LinReg output
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++ is 25mV below target. */
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++#define HW_POWER_DCDC_LINREG_ON 3
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++
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++/* Powered by DCDC converter and the LinReg is off. LinReg output
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++ is 25mV below target. */
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++#define HW_POWER_DCDC_LINREG_OFF 4
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++
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++/* Powered by DCDC converter and the LinReg is ready for the
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++ automatic hardware transfer. The LinReg output is not enabled and
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++ depends on the 5V presence to enable the LinRegs. LinReg offset is 25mV
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++ below target. */
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++#define HW_POWER_DCDC_LINREG_READY 5
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++
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++/* Powered by an external source when 5V is present. This does not
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++ necessarily mean the external source is powered by 5V,but the chip needs
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++ to be aware that 5V is present. */
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++#define HW_POWER_EXTERNAL_SOURCE_5V 6
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++
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++/* Powered by an external source when 5V is not present.This doesn't
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++ necessarily mean the external source is powered by the battery, but the
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++ chip needs to be aware that the battery is present */
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++#define HW_POWER_EXTERNAL_SOURCE_BATTERY 7
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++
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++/* Unknown configuration. This is an error. */
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++#define HW_POWER_UNKNOWN_SOURCE 8
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++
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++/* TODO: Move power register offsets into header file */
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++#define HW_POWER_5VCTRL 0x00000010
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++#define HW_POWER_VDDDCTRL 0x00000040
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++#define HW_POWER_VDDACTRL 0x00000050
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++#define HW_POWER_VDDIOCTRL 0x00000060
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++#define HW_POWER_MISC 0x00000090
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++#define HW_POWER_STS 0x000000c0
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++
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++#define BM_POWER_STS_VBUSVALID0_STATUS BIT(15)
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++#define BM_POWER_STS_DC_OK BIT(9)
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++
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++#define BM_POWER_5VCTRL_ILIMIT_EQ_ZERO BIT(2)
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++#define BM_POWER_5VCTRL_ENABLE_DCDC BIT(0)
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++
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++#define BM_POWER_LINREG_OFFSET_DCDC_MODE BIT(1)
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++
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++#define SHIFT_FREQSEL 4
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++
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++#define BM_POWER_MISC_FREQSEL (7 << SHIFT_FREQSEL)
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++
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++/* Recommended DC-DC clock source values */
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++#define HW_POWER_MISC_FREQSEL_20000_KHZ 1
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++#define HW_POWER_MISC_FREQSEL_24000_KHZ 2
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++#define HW_POWER_MISC_FREQSEL_19200_KHZ 3
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++
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++#define HW_POWER_MISC_SEL_PLLCLK BIT(0)
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++
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++/* Regulator IDs */
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++#define MXS_DCDC 1
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++#define MXS_VDDIO 2
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++#define MXS_VDDA 3
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++#define MXS_VDDD 4
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++
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++struct mxs_reg_info {
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++ /* regulator descriptor */
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++ struct regulator_desc desc;
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++
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++ /* regulator control register */
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++ int ctrl_reg;
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++
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++ /* disable DC-DC output */
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++ unsigned int disable_fet_mask;
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++
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++ /* steps between linreg output and DC-DC target */
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++ unsigned int linreg_offset_mask;
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++ u8 linreg_offset_shift;
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++
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++ /* function which determine power source */
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++ u8 (*get_power_source)(struct regulator_dev *);
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++};
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++
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++static inline u8 get_linreg_offset(struct mxs_reg_info *ldo, u32 regs)
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++{
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++ return (regs & ldo->linreg_offset_mask) >> ldo->linreg_offset_shift;
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++}
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++
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++static u8 get_vddio_power_source(struct regulator_dev *reg)
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++{
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++ struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
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++ u32 v5ctrl, status, base;
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++ u8 offset;
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++
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++ if (regmap_read(reg->regmap, HW_POWER_5VCTRL, &v5ctrl))
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++ return HW_POWER_UNKNOWN_SOURCE;
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++
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++ if (regmap_read(reg->regmap, HW_POWER_STS, &status))
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++ return HW_POWER_UNKNOWN_SOURCE;
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++
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++ if (regmap_read(reg->regmap, ldo->ctrl_reg, &base))
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++ return HW_POWER_UNKNOWN_SOURCE;
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++
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++ offset = get_linreg_offset(ldo, base);
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++
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++ /* If VBUS valid then 5 V power supply present */
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++ if (status & BM_POWER_STS_VBUSVALID0_STATUS) {
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++ /* Powered by Linreg, DC-DC is off */
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++ if ((base & ldo->disable_fet_mask) &&
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++ !(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)) {
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++ return HW_POWER_LINREG_DCDC_OFF;
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++ }
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++
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++ if (v5ctrl & BM_POWER_5VCTRL_ENABLE_DCDC) {
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++ /* Powered by DC-DC, Linreg is on */
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++ if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)
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++ return HW_POWER_DCDC_LINREG_ON;
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++ } else {
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++ /* Powered by Linreg, DC-DC is off */
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++ if (!(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE))
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++ return HW_POWER_LINREG_DCDC_OFF;
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++ }
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++ } else {
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++ /* Powered by DC-DC, Linreg is on */
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++ if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)
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++ return HW_POWER_DCDC_LINREG_ON;
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++ }
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++
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++ return HW_POWER_UNKNOWN_SOURCE;
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++}
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++
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++static u8 get_vdda_vddd_power_source(struct regulator_dev *reg)
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++{
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++ struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
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++ struct regulator_desc *desc = &ldo->desc;
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++ u32 v5ctrl, status, base;
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++ u8 offset;
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++
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++ if (regmap_read(reg->regmap, HW_POWER_5VCTRL, &v5ctrl))
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++ return HW_POWER_UNKNOWN_SOURCE;
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++
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++ if (regmap_read(reg->regmap, HW_POWER_STS, &status))
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++ return HW_POWER_UNKNOWN_SOURCE;
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++
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++ if (regmap_read(reg->regmap, ldo->ctrl_reg, &base))
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++ return HW_POWER_UNKNOWN_SOURCE;
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++
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++ offset = get_linreg_offset(ldo, base);
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++
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++ /* DC-DC output is disabled */
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++ if (base & ldo->disable_fet_mask) {
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++ /* Powered by 5 V supply */
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++ if (status & BM_POWER_STS_VBUSVALID0_STATUS)
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++ return HW_POWER_EXTERNAL_SOURCE_5V;
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++
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++ /* Powered by Linreg, DC-DC is off */
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++ if (!(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE))
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++ return HW_POWER_LINREG_DCDC_OFF;
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++ }
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++
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++ /* If VBUS valid then 5 V power supply present */
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++ if (status & BM_POWER_STS_VBUSVALID0_STATUS) {
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++ /* Powered by DC-DC, Linreg is on */
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++ if (v5ctrl & BM_POWER_5VCTRL_ENABLE_DCDC)
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++ return HW_POWER_DCDC_LINREG_ON;
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++
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++ /* Powered by Linreg, DC-DC is off */
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++ return HW_POWER_LINREG_DCDC_OFF;
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++ }
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++
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++ /* DC-DC is on */
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++ if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE) {
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++ /* Powered by DC-DC, Linreg is on */
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++ if (base & desc->enable_mask)
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++ return HW_POWER_DCDC_LINREG_ON;
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++
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++ /* Powered by DC-DC, Linreg is off */
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++ return HW_POWER_DCDC_LINREG_OFF;
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++ }
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++
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++ return HW_POWER_UNKNOWN_SOURCE;
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++}
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++
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++static int mxs_set_dcdc_freq(struct regulator_dev *reg, u32 hz)
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++{
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++ struct mxs_reg_info *dcdc = rdev_get_drvdata(reg);
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++ u32 val;
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++ int ret;
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++
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++ if (dcdc->desc.id != MXS_DCDC) {
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++ dev_warn(®->dev, "Setting switching freq is not supported\n");
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++ return -EINVAL;
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++ }
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++
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++ ret = regmap_read(reg->regmap, HW_POWER_MISC, &val);
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++ if (ret)
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++ return ret;
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++
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++ val &= ~BM_POWER_MISC_FREQSEL;
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++ val &= ~HW_POWER_MISC_SEL_PLLCLK;
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++
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++ /*
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++ * Select the PLL/PFD based frequency that the DC-DC converter uses.
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++ * The actual switching frequency driving the power inductor is
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++ * DCDC_CLK/16. Accept only values recommend by Freescale.
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++ */
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++ switch (hz) {
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++ case 1200000:
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++ val |= HW_POWER_MISC_FREQSEL_19200_KHZ << SHIFT_FREQSEL;
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++ break;
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++ case 1250000:
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++ val |= HW_POWER_MISC_FREQSEL_20000_KHZ << SHIFT_FREQSEL;
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++ break;
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++ case 1500000:
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++ val |= HW_POWER_MISC_FREQSEL_24000_KHZ << SHIFT_FREQSEL;
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++ break;
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++ default:
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++ dev_warn(®->dev, "Switching freq: %u Hz not supported\n",
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++ hz);
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++ return -EINVAL;
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++ }
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++
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++ /* First program FREQSEL */
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++ ret = regmap_write(reg->regmap, HW_POWER_MISC, val);
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++ if (ret)
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++ return ret;
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++
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++ /* then set PLL as clock for DC-DC converter */
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++ val |= HW_POWER_MISC_SEL_PLLCLK;
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++
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++ return regmap_write(reg->regmap, HW_POWER_MISC, val);
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++}
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++
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++static int mxs_ldo_set_voltage_sel(struct regulator_dev *reg, unsigned sel)
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++{
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++ struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
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++ struct regulator_desc *desc = &ldo->desc;
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++ u32 status = 0;
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++ int timeout;
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++ int ret;
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++
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++ ret = regmap_update_bits(reg->regmap, desc->vsel_reg, desc->vsel_mask,
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++ sel);
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++ if (ret)
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++ return ret;
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++
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++ if (ldo->get_power_source) {
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++ switch (ldo->get_power_source(reg)) {
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++ case HW_POWER_LINREG_DCDC_OFF:
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++ case HW_POWER_LINREG_DCDC_READY:
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++ case HW_POWER_EXTERNAL_SOURCE_5V:
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++ /*
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++ * Since the DC-DC converter is off we can't
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++ * trigger on DC_OK. So wait at least 1 ms
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++ * for stabilization.
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++ */
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++ usleep_range(1000, 2000);
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++ return 0;
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++ }
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++ }
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++
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++ /* Make sure DC_OK has changed */
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++ usleep_range(15, 20);
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++
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++ for (timeout = 0; timeout < 20; timeout++) {
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++ ret = regmap_read(reg->regmap, HW_POWER_STS, &status);
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++
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++ if (ret)
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++ break;
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++
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++ /* DC-DC converter control loop has stabilized */
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++ if (status & BM_POWER_STS_DC_OK)
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++ return 0;
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++
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++ udelay(1);
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++ }
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++
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++ if (!ret)
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++ dev_warn_ratelimited(®->dev, "%s: timeout status=0x%08x\n",
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++ __func__, status);
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++
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++ msleep(20);
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++
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++ return -ETIMEDOUT;
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++}
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++
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++static int mxs_ldo_is_enabled(struct regulator_dev *reg)
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++{
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++ struct mxs_reg_info *ldo = rdev_get_drvdata(reg);
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++
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++ if (ldo->get_power_source) {
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++ switch (ldo->get_power_source(reg)) {
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++ case HW_POWER_LINREG_DCDC_OFF:
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++ case HW_POWER_LINREG_DCDC_READY:
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++ case HW_POWER_DCDC_LINREG_ON:
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++ return 1;
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++ }
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++ }
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++
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++ return 0;
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++}
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++
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++static struct regulator_ops mxs_dcdc_ops = {
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++ .is_enabled = regulator_is_enabled_regmap,
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++};
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++
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++static struct regulator_ops mxs_ldo_ops = {
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++ .list_voltage = regulator_list_voltage_linear,
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++ .map_voltage = regulator_map_voltage_linear,
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++ .set_voltage_sel = mxs_ldo_set_voltage_sel,
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++ .get_voltage_sel = regulator_get_voltage_sel_regmap,
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++ .is_enabled = mxs_ldo_is_enabled,
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|
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++};
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++
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|
++static const struct mxs_reg_info mxs_info_dcdc = {
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++ .desc = {
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++ .name = "dcdc",
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++ .id = MXS_DCDC,
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++ .type = REGULATOR_VOLTAGE,
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|
++ .owner = THIS_MODULE,
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++ .ops = &mxs_dcdc_ops,
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++ .enable_reg = HW_POWER_STS,
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++ .enable_mask = (1 << 0),
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|
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++ },
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++};
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++
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|
++static const struct mxs_reg_info imx23_info_vddio = {
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++ .desc = {
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++ .name = "vddio",
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++ .id = MXS_VDDIO,
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++ .type = REGULATOR_VOLTAGE,
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++ .owner = THIS_MODULE,
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++ .n_voltages = 0x20,
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++ .uV_step = 25000,
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++ .linear_min_sel = 0,
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++ .min_uV = 2800000,
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++ .vsel_reg = HW_POWER_VDDIOCTRL,
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++ .vsel_mask = 0x1f,
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++ .ops = &mxs_ldo_ops,
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|
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++ },
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++ .ctrl_reg = HW_POWER_VDDIOCTRL,
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++ .disable_fet_mask = 1 << 16,
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|
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++ .linreg_offset_mask = 3 << 12,
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++ .linreg_offset_shift = 12,
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++ .get_power_source = get_vddio_power_source,
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|
|
++};
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|
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++
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|
|
++static const struct mxs_reg_info imx28_info_vddio = {
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|
|
++ .desc = {
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|
|
++ .name = "vddio",
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|
|
++ .id = MXS_VDDIO,
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|
|
++ .type = REGULATOR_VOLTAGE,
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|
|
++ .owner = THIS_MODULE,
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|
|
++ .n_voltages = 0x11,
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|
|
++ .uV_step = 50000,
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|
|
++ .linear_min_sel = 0,
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|
|
++ .min_uV = 2800000,
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|
|
++ .vsel_reg = HW_POWER_VDDIOCTRL,
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|
|
++ .vsel_mask = 0x1f,
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|
|
++ .ops = &mxs_ldo_ops,
|
|
|
++ },
|
|
|
++ .ctrl_reg = HW_POWER_VDDIOCTRL,
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|
|
++ .disable_fet_mask = 1 << 16,
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|
|
++ .linreg_offset_mask = 3 << 12,
|
|
|
++ .linreg_offset_shift = 12,
|
|
|
++ .get_power_source = get_vddio_power_source,
|
|
|
++};
|
|
|
++
|
|
|
++static const struct mxs_reg_info mxs_info_vdda = {
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|
|
++ .desc = {
|
|
|
++ .name = "vdda",
|
|
|
++ .id = MXS_VDDA,
|
|
|
++ .type = REGULATOR_VOLTAGE,
|
|
|
++ .owner = THIS_MODULE,
|
|
|
++ .n_voltages = 0x20,
|
|
|
++ .uV_step = 25000,
|
|
|
++ .linear_min_sel = 0,
|
|
|
++ .min_uV = 1500000,
|
|
|
++ .vsel_reg = HW_POWER_VDDACTRL,
|
|
|
++ .vsel_mask = 0x1f,
|
|
|
++ .ops = &mxs_ldo_ops,
|
|
|
++ .enable_mask = (1 << 17),
|
|
|
++ },
|
|
|
++ .ctrl_reg = HW_POWER_VDDACTRL,
|
|
|
++ .disable_fet_mask = 1 << 16,
|
|
|
++ .linreg_offset_mask = 3 << 12,
|
|
|
++ .linreg_offset_shift = 12,
|
|
|
++ .get_power_source = get_vdda_vddd_power_source,
|
|
|
++};
|
|
|
++
|
|
|
++static const struct mxs_reg_info mxs_info_vddd = {
|
|
|
++ .desc = {
|
|
|
++ .name = "vddd",
|
|
|
++ .id = MXS_VDDD,
|
|
|
++ .type = REGULATOR_VOLTAGE,
|
|
|
++ .owner = THIS_MODULE,
|
|
|
++ .n_voltages = 0x20,
|
|
|
++ .uV_step = 25000,
|
|
|
++ .linear_min_sel = 0,
|
|
|
++ .min_uV = 800000,
|
|
|
++ .vsel_reg = HW_POWER_VDDDCTRL,
|
|
|
++ .vsel_mask = 0x1f,
|
|
|
++ .ops = &mxs_ldo_ops,
|
|
|
++ .enable_mask = (1 << 21),
|
|
|
++ },
|
|
|
++ .ctrl_reg = HW_POWER_VDDDCTRL,
|
|
|
++ .disable_fet_mask = 1 << 20,
|
|
|
++ .linreg_offset_mask = 3 << 16,
|
|
|
++ .linreg_offset_shift = 16,
|
|
|
++ .get_power_source = get_vdda_vddd_power_source,
|
|
|
++};
|
|
|
++
|
|
|
++static const struct of_device_id of_mxs_regulator_match[] = {
|
|
|
++ { .compatible = "fsl,imx23-dcdc", .data = &mxs_info_dcdc },
|
|
|
++ { .compatible = "fsl,imx28-dcdc", .data = &mxs_info_dcdc },
|
|
|
++ { .compatible = "fsl,imx23-vddio", .data = &imx23_info_vddio },
|
|
|
++ { .compatible = "fsl,imx23-vdda", .data = &mxs_info_vdda },
|
|
|
++ { .compatible = "fsl,imx23-vddd", .data = &mxs_info_vddd },
|
|
|
++ { .compatible = "fsl,imx28-vddio", .data = &imx28_info_vddio },
|
|
|
++ { .compatible = "fsl,imx28-vdda", .data = &mxs_info_vdda },
|
|
|
++ { .compatible = "fsl,imx28-vddd", .data = &mxs_info_vddd },
|
|
|
++ { /* end */ }
|
|
|
++};
|
|
|
++MODULE_DEVICE_TABLE(of, of_mxs_regulator_match);
|
|
|
++
|
|
|
++static int mxs_regulator_probe(struct platform_device *pdev)
|
|
|
++{
|
|
|
++ struct device *dev = &pdev->dev;
|
|
|
++ const struct of_device_id *match;
|
|
|
++ struct device_node *parent_np;
|
|
|
++ struct regulator_dev *rdev = NULL;
|
|
|
++ struct mxs_reg_info *info;
|
|
|
++ struct regulator_init_data *initdata;
|
|
|
++ struct regulator_config config = { };
|
|
|
++ u32 switch_freq;
|
|
|
++
|
|
|
++ match = of_match_device(of_mxs_regulator_match, dev);
|
|
|
++ if (!match) {
|
|
|
++ /* We do not expect this to happen */
|
|
|
++ dev_err(dev, "%s: Unable to match device\n", __func__);
|
|
|
++ return -ENODEV;
|
|
|
++ }
|
|
|
++
|
|
|
++ info = devm_kmemdup(dev, match->data, sizeof(struct mxs_reg_info),
|
|
|
++ GFP_KERNEL);
|
|
|
++ if (!info)
|
|
|
++ return -ENOMEM;
|
|
|
++
|
|
|
++ initdata = of_get_regulator_init_data(dev, dev->of_node, &info->desc);
|
|
|
++ if (!initdata) {
|
|
|
++ dev_err(dev, "missing regulator init data\n");
|
|
|
++ return -EINVAL;
|
|
|
++ }
|
|
|
++
|
|
|
++ parent_np = of_get_parent(dev->of_node);
|
|
|
++ if (!parent_np)
|
|
|
++ return -ENODEV;
|
|
|
++ config.regmap = syscon_node_to_regmap(parent_np);
|
|
|
++ of_node_put(parent_np);
|
|
|
++ if (IS_ERR(config.regmap))
|
|
|
++ return PTR_ERR(config.regmap);
|
|
|
++
|
|
|
++ config.dev = dev;
|
|
|
++ config.init_data = initdata;
|
|
|
++ config.driver_data = info;
|
|
|
++ config.of_node = dev->of_node;
|
|
|
++
|
|
|
++ rdev = devm_regulator_register(dev, &info->desc, &config);
|
|
|
++ if (IS_ERR(rdev)) {
|
|
|
++ int ret = PTR_ERR(rdev);
|
|
|
++
|
|
|
++ dev_err(dev, "%s: failed to register regulator(%d)\n",
|
|
|
++ __func__, ret);
|
|
|
++ return ret;
|
|
|
++ }
|
|
|
++
|
|
|
++ if (!of_property_read_u32(dev->of_node, "switching-frequency",
|
|
|
++ &switch_freq))
|
|
|
++ mxs_set_dcdc_freq(rdev, switch_freq);
|
|
|
++
|
|
|
++ platform_set_drvdata(pdev, rdev);
|
|
|
++
|
|
|
++ return 0;
|
|
|
++}
|
|
|
++
|
|
|
++static struct platform_driver mxs_regulator_driver = {
|
|
|
++ .driver = {
|
|
|
++ .name = "mxs_regulator",
|
|
|
++ .of_match_table = of_mxs_regulator_match,
|
|
|
++ },
|
|
|
++ .probe = mxs_regulator_probe,
|
|
|
++};
|
|
|
++
|
|
|
++module_platform_driver(mxs_regulator_driver);
|
|
|
++
|
|
|
++MODULE_AUTHOR("Stefan Wahren <[email protected]>");
|
|
|
++MODULE_DESCRIPTION("Freescale MXS regulators");
|
|
|
++MODULE_LICENSE("GPL v2");
|
|
|
++MODULE_ALIAS("platform:mxs_regulator");
|
Zoltan Herpai