This patch adds driver support for Freescale i.MX23, i.MX28 on-chip regulators. There are 4 voltage regulators: vddd, vdda, vddio, vddmem and 1 overall current regulator. Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx> --- drivers/regulator/Kconfig | 9 + drivers/regulator/Makefile | 1 + drivers/regulator/mxs-regulator.c | 411 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 421 insertions(+) create mode 100644 drivers/regulator/mxs-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 7a3a061..e90e587 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -432,6 +432,15 @@ config REGULATOR_MC13892 Say y here to support the regulators found on the Freescale MC13892 PMIC. +config REGULATOR_MXS + tristate "Freescale MXS on-chip regulators" + depends on ARCH_MXS + default y if ARCH_MXS + 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 25271f8..0f5b66c 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_REGULATOR_MAX77802) += max77802.o obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o +obj-$(CONFIG_REGULATOR_MXS) += mxs-regulator.o obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o obj-$(CONFIG_REGULATOR_TPS51632) += tps51632-regulator.o diff --git a/drivers/regulator/mxs-regulator.c b/drivers/regulator/mxs-regulator.c new file mode 100644 index 0000000..7d74518 --- /dev/null +++ b/drivers/regulator/mxs-regulator.c @@ -0,0 +1,411 @@ +/* + * Freescale STMP378X voltage regulators + * + * Embedded Alley Solutions, Inc <source@xxxxxxxxxxxxxxxxx> + * + * Copyright (C) 2014 Stefan Wahren + * Copyright (C) 2010 Freescale Semiconductor, Inc. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + */ + +/* + * 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/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> +#include <linux/slab.h> + +#define HW_POWER_VDDDCTRL (0x00000040) +#define HW_POWER_VDDACTRL (0x00000050) +#define HW_POWER_VDDIOCTRL (0x00000060) +#define HW_POWER_STS (0x000000c0) + +#define BM_POWER_STS_DC_OK (1 << 9) +#define BM_POWER_REG_MODE (1 << 17) +#define BM_POWER_LEVEL_TRG 0x1f + +#define MXS_REG5V_NOT_USB 0 +#define MXS_REG5V_IS_USB 1 + + +struct mxs_regulator { + struct regulator_desc rdesc; + struct regulator_init_data *initdata; + struct mxs_regulator *parent; + + spinlock_t lock; + wait_queue_head_t wait_q; + struct notifier_block nb; + + const char *name; + void __iomem *base_addr; + void __iomem *power_addr; + int mode; + int cur_uV; + int cur_uA; + int max_uA; + u32 max_reg_val; +}; + +static int mxs_set_voltage(struct regulator_dev *reg, int min_uV, int max_uV, + unsigned *selector) +{ + struct mxs_regulator *sreg = rdev_get_drvdata(reg); + struct regulation_constraints *con = &sreg->initdata->constraints; + void __iomem *power_sts = sreg->power_addr + HW_POWER_STS; + u32 val, regs, i; + + pr_debug("%s: uv %d, min %d, max %d\n", __func__, + max_uV, con->min_uV, con->max_uV); + + if (max_uV < con->min_uV || max_uV > con->max_uV) + return -EINVAL; + + val = (max_uV - con->min_uV) * sreg->max_reg_val / + (con->max_uV - con->min_uV); + + regs = (__raw_readl(sreg->base_addr) & ~BM_POWER_LEVEL_TRG); + pr_debug("%s: calculated val %d\n", __func__, val); + __raw_writel(val | regs, sreg->base_addr); + for (i = 20; i; i--) { + if (__raw_readl(power_sts) & BM_POWER_STS_DC_OK) + break; + udelay(1); + } + + if (i) + goto out; + + __raw_writel(val | regs, sreg->base_addr); + for (i = 40000; i; i--) { + if (__raw_readl(power_sts) & BM_POWER_STS_DC_OK) + break; + udelay(1); + } + + if (i) + goto out; + + for (i = 40000; i; i--) { + if (__raw_readl(power_sts) & BM_POWER_STS_DC_OK) + break; + udelay(1); + } + +out: + return !i; +} + + +static int mxs_get_voltage(struct regulator_dev *reg) +{ + struct mxs_regulator *sreg = rdev_get_drvdata(reg); + struct regulation_constraints *con = &sreg->initdata->constraints; + int uv; + u32 val = __raw_readl(sreg->base_addr) & BM_POWER_LEVEL_TRG; + + if (val > sreg->max_reg_val) + val = sreg->max_reg_val; + + uv = con->min_uV + val * + (con->max_uV - con->min_uV) / sreg->max_reg_val; + + return uv; +} + +static int main_add_current(struct mxs_regulator *sreg, + int uA) +{ + pr_debug("%s: enter reg %s, uA=%d\n", __func__, sreg->name, uA); + + if (uA > 0 && (sreg->cur_uA + uA > sreg->max_uA)) + return -EINVAL; + + sreg->cur_uA += uA; + + return 0; +} + +static int mxs_set_current_limit(struct regulator_dev *reg, int min_uA, + int max_uA) +{ + struct mxs_regulator *sreg = rdev_get_drvdata(reg); + struct mxs_regulator *parent = sreg->parent; + int ret = 0; + unsigned long flags; + + pr_debug("%s: enter reg %s, uA=%d\n", + __func__, sreg->name, max_uA); + + if (parent) { + spin_lock_irqsave(&parent->lock, flags); + ret = main_add_current(parent, max_uA - sreg->cur_uA); + spin_unlock_irqrestore(&parent->lock, flags); + } + + if ((!ret) || (!parent)) + goto out; + + if (sreg->mode == REGULATOR_MODE_FAST) + return ret; + + while (ret) { + wait_event(parent->wait_q , + (max_uA - sreg->cur_uA < + parent->max_uA - + parent->cur_uA)); + spin_lock_irqsave(&parent->lock, flags); + ret = main_add_current(parent, max_uA - sreg->cur_uA); + spin_unlock_irqrestore(&parent->lock, flags); + } +out: + if (parent && (max_uA - sreg->cur_uA < 0)) + wake_up_all(&parent->wait_q); + sreg->cur_uA = max_uA; + return 0; +} + +static int mxs_get_current_limit(struct regulator_dev *reg) +{ + struct mxs_regulator *sreg = rdev_get_drvdata(reg); + + return sreg->cur_uA; +} + +static int mxs_set_mode(struct regulator_dev *reg, unsigned int mode) +{ + struct mxs_regulator *sreg = rdev_get_drvdata(reg); + int ret = 0; + u32 val; + + switch (mode) { + case REGULATOR_MODE_FAST: + val = __raw_readl(sreg->base_addr); + __raw_writel(val | BM_POWER_REG_MODE, sreg->base_addr); + break; + + case REGULATOR_MODE_NORMAL: + val = __raw_readl(sreg->base_addr); + __raw_writel(val & ~BM_POWER_REG_MODE, sreg->base_addr); + break; + + default: + ret = -EINVAL; + break; + } + return ret; +} + +static unsigned int mxs_get_mode(struct regulator_dev *reg) +{ + struct mxs_regulator *sreg = rdev_get_drvdata(reg); + u32 val = __raw_readl(sreg->base_addr) & BM_POWER_REG_MODE; + + return val ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; +} + +static struct regulator_ops mxs_rops = { + .set_voltage = mxs_set_voltage, + .get_voltage = mxs_get_voltage, + .set_current_limit = mxs_set_current_limit, + .get_current_limit = mxs_get_current_limit, + .set_mode = mxs_set_mode, + .get_mode = mxs_get_mode, +}; + +static int reg_callback(struct notifier_block *self, + unsigned long event, void *data) +{ + unsigned long flags; + struct mxs_regulator *sreg = + container_of(self, struct mxs_regulator , nb); + + switch (event) { + case MXS_REG5V_IS_USB: + spin_lock_irqsave(&sreg->lock, flags); + sreg->max_uA = 500000; + spin_unlock_irqrestore(&sreg->lock, flags); + break; + case MXS_REG5V_NOT_USB: + spin_lock_irqsave(&sreg->lock, flags); + sreg->max_uA = 0x7fffffff; + spin_unlock_irqrestore(&sreg->lock, flags); + break; + } + + return 0; +} + +static int mxs_regulator_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct device_node *parent; + struct regulator_desc *rdesc; + struct regulator_dev *rdev; + struct mxs_regulator *sreg; + struct regulator_init_data *initdata; + struct regulation_constraints *con; + struct regulator_config config = { }; + void __iomem *base_addr = NULL; + void __iomem *power_addr = NULL; + u64 regaddr64 = 0; + const u32 *regaddr_p; + u32 val = 0; + int ret; + + if (!np) { + dev_err(dev, "missing device tree\n"); + return -EINVAL; + } + + /* get device base address */ + base_addr = of_iomap(np, 0); + if (!base_addr) + return -ENXIO; + + parent = of_get_parent(np); + if (!parent) + return -ENXIO; + + power_addr = of_iomap(parent, 0); + if (!power_addr) + return -ENXIO; + + regaddr_p = of_get_address(np, 0, NULL, NULL); + if (regaddr_p) + regaddr64 = of_translate_address(np, regaddr_p); + + if (!regaddr64) { + dev_err(dev, "no or invalid reg property set\n"); + return -EINVAL; + } + + initdata = of_get_regulator_init_data(dev, np); + if (!initdata) + return -EINVAL; + + ret = of_property_read_u32(np, "mxs-max-reg-val", + &val); + if (!val) { + dev_err(dev, "no or invalid mxs-max-reg-val property set\n"); + return ret; + } + + dev_info(dev, "regulator found\n"); + + sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL); + if (!sreg) + return -ENOMEM; + sreg->initdata = initdata; + sreg->name = of_get_property(np, "regulator-name", NULL); + sreg->cur_uA = 0; + sreg->cur_uV = 0; + sreg->base_addr = base_addr; + sreg->power_addr = power_addr; + init_waitqueue_head(&sreg->wait_q); + spin_lock_init(&sreg->lock); + sreg->max_reg_val = val; + + rdesc = &sreg->rdesc; + rdesc->name = sreg->name; + rdesc->owner = THIS_MODULE; + rdesc->ops = &mxs_rops; + + if (strcmp(rdesc->name, "overall_current") == 0) + rdesc->type = REGULATOR_CURRENT; + else + rdesc->type = REGULATOR_VOLTAGE; + + con = &initdata->constraints; + rdesc->n_voltages = sreg->max_reg_val; + rdesc->min_uV = con->min_uV; + rdesc->uV_step = (con->max_uV - con->min_uV) / sreg->max_reg_val; + rdesc->linear_min_sel = 0; + rdesc->vsel_reg = regaddr64; + rdesc->vsel_mask = BM_POWER_LEVEL_TRG; + + config.dev = &pdev->dev; + config.init_data = initdata; + config.driver_data = sreg; + config.of_node = np; + + pr_debug("probing regulator %s %s %d\n", + sreg->name, + rdesc->name, + pdev->id); + + /* register regulator */ + rdev = devm_regulator_register(dev, rdesc, &config); + + if (IS_ERR(rdev)) { + dev_err(&pdev->dev, "failed to register %s\n", + rdesc->name); + return PTR_ERR(rdev); + } + + if (sreg->max_uA) { + struct regulator *regu; + + regu = regulator_get(NULL, sreg->name); + sreg->nb.notifier_call = reg_callback; + regulator_register_notifier(regu, &sreg->nb); + } + + platform_set_drvdata(pdev, rdev); + + of_property_read_u32(np, "mxs-default-microvolt", + &val); + + if (val) + mxs_set_voltage(rdev, val, val, NULL); + + return 0; +} + +static struct of_device_id of_mxs_regulator_match_tbl[] = { + { .compatible = "fsl,mxs-regulator", }, + { /* end */ } +}; + +static struct platform_driver mxs_regulator_driver = { + .driver = { + .name = "mxs-regulator", + .owner = THIS_MODULE, + .of_match_table = of_mxs_regulator_match_tbl, + }, + .probe = mxs_regulator_probe, +}; + +static int __init mxs_regulator_init(void) +{ + return platform_driver_register(&mxs_regulator_driver); +} +postcore_initcall(mxs_regulator_init); + +static void __exit mxs_regulator_exit(void) +{ + platform_driver_unregister(&mxs_regulator_driver); +} +module_exit(mxs_regulator_exit); + +MODULE_AUTHOR("Embedded Alley Solutions <source@xxxxxxxxxxxxxxxxx>"); +MODULE_AUTHOR("Stefan Wahren <stefan.wahren@xxxxxxxx>"); +MODULE_DESCRIPTION("Freescale STMP378X voltage regulators"); +MODULE_LICENSE("GPL v2"); -- 1.8.1.4 -- 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
