Commit e3e5aff7 authored by Ying-Chun Liu (PaulLiu)'s avatar Ying-Chun Liu (PaulLiu) Committed by Mark Brown
Browse files

regulator: Add Anatop regulator driver 



Anatop is an integrated regulator inside i.MX6 SoC.
There are 3 digital regulators which controls PU, CORE (ARM), and SOC.
And 3 analog regulators which controls 1P1, 2P5, 3P0 (USB).
This patch adds the Anatop regulator driver.

Signed-off-by: default avatarNancy Chen <Nancy.Chen@freescale.com>
Signed-off-by: default avatarYing-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Acked-by: default avatarShawn Guo <shawn.guo@linaro.org>
Reviewed-by: default avatarAxel Lin <axel.lin@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent c567556e

drivers/regulator/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -102,6 +102,14 @@ config REGULATOR_DA9052 
	  This driver supports the voltage regulators of DA9052-BC and

	  DA9053-AA/Bx PMIC.



config REGULATOR_ANATOP

	tristate "Freescale i.MX on-chip ANATOP LDO regulators"

	depends on MFD_ANATOP

	help

	  Say y here to support Freescale i.MX on-chip ANATOP LDOs

	  regulators. It is recommended that this option be

	  enabled on i.MX6 platform.



config REGULATOR_MC13XXX_CORE

	tristate

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o 
obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o

obj-$(CONFIG_REGULATOR_AB8500)	+= ab8500.o

obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o

obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o

obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o

obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o

obj-$(CONFIG_REGULATOR_DA9052)	+= da9052-regulator.o

drivers/regulator/anatop-regulator.c

0 → 100644
+241 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2011 Freescale Semiconductor, Inc. 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 as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.



 * 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.



 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */



#include <linux/slab.h>

#include <linux/device.h>

#include <linux/module.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/mfd/anatop.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/of_regulator.h>



struct anatop_regulator {

	const char *name;

	u32 control_reg;

	struct anatop *mfd;

	int vol_bit_shift;

	int vol_bit_width;

	int min_bit_val;

	int min_voltage;

	int max_voltage;

	struct regulator_desc rdesc;

	struct regulator_init_data *initdata;

};



static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,

				  int max_uV, unsigned *selector)

{

	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	u32 val, sel;

	int uv;



	uv = min_uV;

	dev_dbg(&reg->dev, "%s: uv %d, min %d, max %d\n", __func__,

		uv, anatop_reg->min_voltage,

		anatop_reg->max_voltage);



	if (uv < anatop_reg->min_voltage) {

		if (max_uV > anatop_reg->min_voltage)

			uv = anatop_reg->min_voltage;

		else

			return -EINVAL;

	}



	if (!anatop_reg->control_reg)

		return -ENOTSUPP;



	sel = DIV_ROUND_UP(uv - anatop_reg->min_voltage, 25000);

	if (sel * 25000 + anatop_reg->min_voltage > anatop_reg->max_voltage)

		return -EINVAL;

	val = anatop_reg->min_bit_val + sel;

	*selector = sel;

	dev_dbg(&reg->dev, "%s: calculated val %d\n", __func__, val);

	anatop_set_bits(anatop_reg->mfd,

			anatop_reg->control_reg,

			anatop_reg->vol_bit_shift,

			anatop_reg->vol_bit_width,

			val);



	return 0;

}



static int anatop_get_voltage_sel(struct regulator_dev *reg)

{

	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	u32 val;



	if (!anatop_reg->control_reg)

		return -ENOTSUPP;



	val = anatop_get_bits(anatop_reg->mfd,

			      anatop_reg->control_reg,

			      anatop_reg->vol_bit_shift,

			      anatop_reg->vol_bit_width);



	return val - anatop_reg->min_bit_val;

}



static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)

{

	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);

	int uv;



	uv = anatop_reg->min_voltage + selector * 25000;

	dev_dbg(&reg->dev, "vddio = %d, selector = %u\n", uv, selector);



	return uv;

}



static struct regulator_ops anatop_rops = {

	.set_voltage     = anatop_set_voltage,

	.get_voltage_sel = anatop_get_voltage_sel,

	.list_voltage    = anatop_list_voltage,

};



static int __devinit anatop_regulator_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	struct regulator_desc *rdesc;

	struct regulator_dev *rdev;

	struct anatop_regulator *sreg;

	struct regulator_init_data *initdata;

	struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);

	int ret = 0;



	initdata = of_get_regulator_init_data(dev, np);

	sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);

	if (!sreg)

		return -ENOMEM;

	sreg->initdata = initdata;

	sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),

			     GFP_KERNEL);

	rdesc = &sreg->rdesc;

	memset(rdesc, 0, sizeof(*rdesc));

	rdesc->name = sreg->name;

	rdesc->ops = &anatop_rops;

	rdesc->type = REGULATOR_VOLTAGE;

	rdesc->owner = THIS_MODULE;

	sreg->mfd = anatopmfd;

	ret = of_property_read_u32(np, "reg", &sreg->control_reg);

	if (ret) {

		dev_err(dev, "no reg property set\n");

		goto anatop_probe_end;

	}

	ret = of_property_read_u32(np, "anatop-vol-bit-width",

				   &sreg->vol_bit_width);

	if (ret) {

		dev_err(dev, "no anatop-vol-bit-width property set\n");

		goto anatop_probe_end;

	}

	ret = of_property_read_u32(np, "anatop-vol-bit-shift",

				   &sreg->vol_bit_shift);

	if (ret) {

		dev_err(dev, "no anatop-vol-bit-shift property set\n");

		goto anatop_probe_end;

	}

	ret = of_property_read_u32(np, "anatop-min-bit-val",

				   &sreg->min_bit_val);

	if (ret) {

		dev_err(dev, "no anatop-min-bit-val property set\n");

		goto anatop_probe_end;

	}

	ret = of_property_read_u32(np, "anatop-min-voltage",

				   &sreg->min_voltage);

	if (ret) {

		dev_err(dev, "no anatop-min-voltage property set\n");

		goto anatop_probe_end;

	}

	ret = of_property_read_u32(np, "anatop-max-voltage",

				   &sreg->max_voltage);

	if (ret) {

		dev_err(dev, "no anatop-max-voltage property set\n");

		goto anatop_probe_end;

	}



	rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)

		/ 25000 + 1;



	/* register regulator */

	rdev = regulator_register(rdesc, dev,

				  initdata, sreg, pdev->dev.of_node);

	if (IS_ERR(rdev)) {

		dev_err(dev, "failed to register %s\n",

			rdesc->name);

		ret = PTR_ERR(rdev);

		goto anatop_probe_end;

	}



	platform_set_drvdata(pdev, rdev);



anatop_probe_end:

	if (ret)

		kfree(sreg->name);



	return ret;

}



static int __devexit anatop_regulator_remove(struct platform_device *pdev)

{

	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	struct anatop_regulator *sreg = rdev_get_drvdata(rdev);

	const char *name = sreg->name;



	regulator_unregister(rdev);

	kfree(name);



	return 0;

}



static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {

	{ .compatible = "fsl,anatop-regulator", },

	{ /* end */ }

};



static struct platform_driver anatop_regulator = {

	.driver = {

		.name	= "anatop_regulator",

		.owner  = THIS_MODULE,

		.of_match_table = of_anatop_regulator_match_tbl,

	},

	.probe	= anatop_regulator_probe,

	.remove	= anatop_regulator_remove,

};



static int __init anatop_regulator_init(void)

{

	return platform_driver_register(&anatop_regulator);

}

postcore_initcall(anatop_regulator_init);



static void __exit anatop_regulator_exit(void)

{

	platform_driver_unregister(&anatop_regulator);

}

module_exit(anatop_regulator_exit);



MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "

	      "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");

MODULE_DESCRIPTION("ANATOP Regulator driver");

MODULE_LICENSE("GPL v2");

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