This patch adds driver support for Freescale i.MX23, i.MX28 on-chip regulators. The driver supports the following components: dcdc, vddd, vdda and vddio. Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx> --- drivers/regulator/Kconfig | 8 + drivers/regulator/Makefile | 1 + drivers/regulator/mxs-regulator.c | 540 +++++++++++++++++++++++++++++++++++++ 3 files changed, 549 insertions(+) create mode 100644 drivers/regulator/mxs-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index a6f116a..7b525f5 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -450,6 +450,14 @@ config REGULATOR_MT6397 This driver supports the control of different power rails of device through regulator interface. +config REGULATOR_MXS + tristate "Freescale MXS on-chip regulators" + depends on (MXS_POWER || COMPILE_TEST) + help + Say y here to support Freescale MXS on-chip regulators. + It is recommended that this option be enabled on i.MX23, + i.MX28 platform. + config REGULATOR_PALMAS tristate "TI Palmas PMIC Regulators" depends on MFD_PALMAS diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 2c4da15..a3ebf23 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -60,6 +60,7 @@ obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o +obj-$(CONFIG_REGULATOR_MXS) += mxs-regulator.o obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o diff --git a/drivers/regulator/mxs-regulator.c b/drivers/regulator/mxs-regulator.c new file mode 100644 index 0000000..e53707b --- /dev/null +++ b/drivers/regulator/mxs-regulator.c @@ -0,0 +1,540 @@ +/* + * Freescale MXS on-chip regulators + * + * Embedded Alley Solutions, Inc <source@xxxxxxxxxxxxxxxxx> + * + * Copyright (C) 2014 Stefan Wahren + * Copyright (C) 2010 Freescale Semiconductor, Inc. + * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved. + * + * Inspired by imx-bootlets + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> +#include <linux/slab.h> + +/* Powered by linear regulator. DCDC output is gated off and + the linreg output is equal to the target. */ +#define HW_POWER_LINREG_DCDC_OFF 1 + +/* Powered by linear regulator. DCDC output is not gated off + and is ready for the automatic hardware transistion after a 5V + event. The converters are not enabled when 5V is present. LinReg output + is 25mV below target. */ +#define HW_POWER_LINREG_DCDC_READY 2 + +/* Powered by DCDC converter and the LinReg is on. LinReg output + is 25mV below target. */ +#define HW_POWER_DCDC_LINREG_ON 3 + +/* Powered by DCDC converter and the LinReg is off. LinReg output + is 25mV below target. */ +#define HW_POWER_DCDC_LINREG_OFF 4 + +/* Powered by DCDC converter and the LinReg is ready for the + automatic hardware transfer. The LinReg output is not enabled and + depends on the 5V presence to enable the LinRegs. LinReg offset is 25mV + below target. */ +#define HW_POWER_DCDC_LINREG_READY 5 + +/* Powered by an external source when 5V is present. This does not + necessarily mean the external source is powered by 5V,but the chip needs + to be aware that 5V is present. */ +#define HW_POWER_EXTERNAL_SOURCE_5V 6 + +/* Powered by an external source when 5V is not present.This doesn't + necessarily mean the external source is powered by the battery, but the + chip needs to be aware that the battery is present */ +#define HW_POWER_EXTERNAL_SOURCE_BATTERY 7 + +/* Unknown configuration. This is an error. */ +#define HW_POWER_UNKNOWN_SOURCE 8 + +/* TODO: Move power register offsets into header file */ +#define HW_POWER_5VCTRL 0x00000010 +#define HW_POWER_VDDDCTRL 0x00000040 +#define HW_POWER_VDDACTRL 0x00000050 +#define HW_POWER_VDDIOCTRL 0x00000060 +#define HW_POWER_MISC 0x00000090 +#define HW_POWER_STS 0x000000c0 + +#define BM_POWER_STS_VBUSVALID0_STATUS BIT(15) +#define BM_POWER_STS_DC_OK BIT(9) + +#define BM_POWER_5VCTRL_ILIMIT_EQ_ZERO BIT(2) +#define BM_POWER_5VCTRL_ENABLE_DCDC BIT(0) + +#define BM_POWER_LINREG_OFFSET_DCDC_MODE BIT(1) + +#define SHIFT_FREQSEL 4 + +#define BM_POWER_MISC_FREQSEL (7 << SHIFT_FREQSEL) + +/* Recommended DC-DC clock source values */ +#define HW_POWER_MISC_FREQSEL_20000_KHZ 1 +#define HW_POWER_MISC_FREQSEL_24000_KHZ 2 +#define HW_POWER_MISC_FREQSEL_19200_KHZ 3 + +#define HW_POWER_MISC_SEL_PLLCLK BIT(0) + +/* Regulator IDs */ +#define MXS_DCDC 1 +#define MXS_VDDIO 2 +#define MXS_VDDA 3 +#define MXS_VDDD 4 + +struct mxs_reg_info { + /* regulator descriptor */ + struct regulator_desc desc; + + /* regulator control register */ + int ctrl_reg; + + /* disable DC-DC output */ + unsigned int disable_fet_mask; + + /* steps between linreg output and DC-DC target */ + unsigned int linreg_offset_mask; + u8 linreg_offset_shift; + + /* function which determine power source */ + u8 (*get_power_source)(struct regulator_dev *); +}; + +static inline u8 get_linreg_offset(struct mxs_reg_info *ldo, u32 regs) +{ + return (regs & ldo->linreg_offset_mask) >> ldo->linreg_offset_shift; +} + +static u8 get_vddio_power_source(struct regulator_dev *reg) +{ + struct mxs_reg_info *ldo = rdev_get_drvdata(reg); + u32 v5ctrl, status, base; + u8 offset; + + if (regmap_read(reg->regmap, HW_POWER_5VCTRL, &v5ctrl)) + return HW_POWER_UNKNOWN_SOURCE; + + if (regmap_read(reg->regmap, HW_POWER_STS, &status)) + return HW_POWER_UNKNOWN_SOURCE; + + if (regmap_read(reg->regmap, ldo->ctrl_reg, &base)) + return HW_POWER_UNKNOWN_SOURCE; + + offset = get_linreg_offset(ldo, base); + + /* If VBUS valid then 5 V power supply present */ + if (status & BM_POWER_STS_VBUSVALID0_STATUS) { + /* Powered by Linreg, DC-DC is off */ + if ((base & ldo->disable_fet_mask) && + !(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)) { + return HW_POWER_LINREG_DCDC_OFF; + } + + if (v5ctrl & BM_POWER_5VCTRL_ENABLE_DCDC) { + /* Powered by DC-DC, Linreg is on */ + if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE) + return HW_POWER_DCDC_LINREG_ON; + } else { + /* Powered by Linreg, DC-DC is off */ + if (!(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)) + return HW_POWER_LINREG_DCDC_OFF; + } + } else { + /* Powered by DC-DC, Linreg is on */ + if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE) + return HW_POWER_DCDC_LINREG_ON; + } + + return HW_POWER_UNKNOWN_SOURCE; +} + +static u8 get_vdda_vddd_power_source(struct regulator_dev *reg) +{ + struct mxs_reg_info *ldo = rdev_get_drvdata(reg); + struct regulator_desc *desc = &ldo->desc; + u32 v5ctrl, status, base; + u8 offset; + + if (regmap_read(reg->regmap, HW_POWER_5VCTRL, &v5ctrl)) + return HW_POWER_UNKNOWN_SOURCE; + + if (regmap_read(reg->regmap, HW_POWER_STS, &status)) + return HW_POWER_UNKNOWN_SOURCE; + + if (regmap_read(reg->regmap, ldo->ctrl_reg, &base)) + return HW_POWER_UNKNOWN_SOURCE; + + offset = get_linreg_offset(ldo, base); + + /* DC-DC output is disabled */ + if (base & ldo->disable_fet_mask) { + /* Powered by 5 V supply */ + if (status & BM_POWER_STS_VBUSVALID0_STATUS) + return HW_POWER_EXTERNAL_SOURCE_5V; + + /* Powered by Linreg, DC-DC is off */ + if (!(offset & BM_POWER_LINREG_OFFSET_DCDC_MODE)) + return HW_POWER_LINREG_DCDC_OFF; + } + + /* If VBUS valid then 5 V power supply present */ + if (status & BM_POWER_STS_VBUSVALID0_STATUS) { + /* Powered by DC-DC, Linreg is on */ + if (v5ctrl & BM_POWER_5VCTRL_ENABLE_DCDC) + return HW_POWER_DCDC_LINREG_ON; + + /* Powered by Linreg, DC-DC is off */ + return HW_POWER_LINREG_DCDC_OFF; + } + + /* DC-DC is on */ + if (offset & BM_POWER_LINREG_OFFSET_DCDC_MODE) { + /* Powered by DC-DC, Linreg is on */ + if (base & desc->enable_mask) + return HW_POWER_DCDC_LINREG_ON; + + /* Powered by DC-DC, Linreg is off */ + return HW_POWER_DCDC_LINREG_OFF; + } + + return HW_POWER_UNKNOWN_SOURCE; +} + +static int mxs_set_dcdc_freq(struct regulator_dev *reg, u32 hz) +{ + struct mxs_reg_info *dcdc = rdev_get_drvdata(reg); + u32 val; + int ret; + + if (dcdc->desc.id != MXS_DCDC) { + dev_warn(®->dev, "Setting switching freq is not supported\n"); + return -EINVAL; + } + + ret = regmap_read(reg->regmap, HW_POWER_MISC, &val); + if (ret) + return ret; + + val &= ~BM_POWER_MISC_FREQSEL; + val &= ~HW_POWER_MISC_SEL_PLLCLK; + + /* + * Select the PLL/PFD based frequency that the DC-DC converter uses. + * The actual switching frequency driving the power inductor is + * DCDC_CLK/16. Accept only values recommend by Freescale. + */ + switch (hz) { + case 1200000: + val |= HW_POWER_MISC_FREQSEL_19200_KHZ << SHIFT_FREQSEL; + break; + case 1250000: + val |= HW_POWER_MISC_FREQSEL_20000_KHZ << SHIFT_FREQSEL; + break; + case 1500000: + val |= HW_POWER_MISC_FREQSEL_24000_KHZ << SHIFT_FREQSEL; + break; + default: + dev_warn(®->dev, "Switching freq: %u Hz not supported\n", + hz); + return -EINVAL; + } + + /* First program FREQSEL */ + ret = regmap_write(reg->regmap, HW_POWER_MISC, val); + if (ret) + return ret; + + /* then set PLL as clock for DC-DC converter */ + val |= HW_POWER_MISC_SEL_PLLCLK; + + return regmap_write(reg->regmap, HW_POWER_MISC, val); +} + +static int mxs_ldo_set_voltage_sel(struct regulator_dev *reg, unsigned sel) +{ + struct mxs_reg_info *ldo = rdev_get_drvdata(reg); + struct regulator_desc *desc = &ldo->desc; + u32 status = 0; + int timeout; + int ret; + + ret = regmap_update_bits(reg->regmap, desc->vsel_reg, desc->vsel_mask, + sel); + if (ret) + return ret; + + if (ldo->get_power_source) { + switch (ldo->get_power_source(reg)) { + case HW_POWER_LINREG_DCDC_OFF: + case HW_POWER_LINREG_DCDC_READY: + case HW_POWER_EXTERNAL_SOURCE_5V: + /* + * Since the DC-DC converter is off we can't + * trigger on DC_OK. So wait at least 1 ms + * for stabilization. + */ + usleep_range(1000, 2000); + return 0; + } + } + + /* Make sure DC_OK has changed */ + usleep_range(15, 20); + + for (timeout = 0; timeout < 20; timeout++) { + ret = regmap_read(reg->regmap, HW_POWER_STS, &status); + + if (ret) + break; + + /* DC-DC converter control loop has stabilized */ + if (status & BM_POWER_STS_DC_OK) + return 0; + + udelay(1); + } + + if (!ret) + dev_warn_ratelimited(®->dev, "%s: timeout status=0x%08x\n", + __func__, status); + + msleep(20); + + return -ETIMEDOUT; +} + +static int mxs_ldo_is_enabled(struct regulator_dev *reg) +{ + struct mxs_reg_info *ldo = rdev_get_drvdata(reg); + + if (ldo->get_power_source) { + switch (ldo->get_power_source(reg)) { + case HW_POWER_LINREG_DCDC_OFF: + case HW_POWER_LINREG_DCDC_READY: + case HW_POWER_DCDC_LINREG_ON: + return 1; + } + } + + return 0; +} + +static struct regulator_ops mxs_dcdc_ops = { + .is_enabled = regulator_is_enabled_regmap, +}; + +static struct regulator_ops mxs_ldo_ops = { + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .set_voltage_sel = mxs_ldo_set_voltage_sel, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .is_enabled = mxs_ldo_is_enabled, +}; + +static const struct mxs_reg_info mxs_info_dcdc = { + .desc = { + .name = "dcdc", + .id = MXS_DCDC, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .ops = &mxs_dcdc_ops, + .enable_reg = HW_POWER_STS, + .enable_mask = (1 << 0), + }, +}; + +static const struct mxs_reg_info imx23_info_vddio = { + .desc = { + .name = "vddio", + .id = MXS_VDDIO, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .n_voltages = 0x20, + .uV_step = 25000, + .linear_min_sel = 0, + .min_uV = 2800000, + .vsel_reg = HW_POWER_VDDIOCTRL, + .vsel_mask = 0x1f, + .ops = &mxs_ldo_ops, + }, + .ctrl_reg = HW_POWER_VDDIOCTRL, + .disable_fet_mask = 1 << 16, + .linreg_offset_mask = 3 << 12, + .linreg_offset_shift = 12, + .get_power_source = get_vddio_power_source, +}; + +static const struct mxs_reg_info imx28_info_vddio = { + .desc = { + .name = "vddio", + .id = MXS_VDDIO, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .n_voltages = 0x11, + .uV_step = 50000, + .linear_min_sel = 0, + .min_uV = 2800000, + .vsel_reg = HW_POWER_VDDIOCTRL, + .vsel_mask = 0x1f, + .ops = &mxs_ldo_ops, + }, + .ctrl_reg = HW_POWER_VDDIOCTRL, + .disable_fet_mask = 1 << 16, + .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 = { + .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 <stefan.wahren@xxxxxxxx>"); +MODULE_DESCRIPTION("Freescale MXS regulators"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:mxs_regulator"); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
