diff options
Diffstat (limited to 'target/linux/mxs/patches-4.1/102-mxs-add-regulator-driver.patch')
| -rw-r--r-- | target/linux/mxs/patches-4.1/102-mxs-add-regulator-driver.patch | 570 |
1 files changed, 570 insertions, 0 deletions
diff --git a/target/linux/mxs/patches-4.1/102-mxs-add-regulator-driver.patch b/target/linux/mxs/patches-4.1/102-mxs-add-regulator-driver.patch new file mode 100644 index 0000000..4690b3c --- /dev/null +++ b/target/linux/mxs/patches-4.1/102-mxs-add-regulator-driver.patch @@ -0,0 +1,570 @@ +--- 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 +--- a/drivers/regulator/Makefile ++++ b/drivers/regulator/Makefile +@@ -60,6 +60,7 @@ obj-$(CONFIG_REGULATOR_MC13783) += mc137 + obj-$(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 +--- /dev/null ++++ b/drivers/regulator/mxs-regulator.c +@@ -0,0 +1,540 @@ ++/* ++ * Freescale MXS on-chip regulators ++ * ++ * Embedded Alley Solutions, Inc <source@embeddedalley.com> ++ * ++ * 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@i2se.com>"); ++MODULE_DESCRIPTION("Freescale MXS regulators"); ++MODULE_LICENSE("GPL v2"); ++MODULE_ALIAS("platform:mxs_regulator"); 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