diff options
Diffstat (limited to 'drivers/regulator/anatop-regulator.c')
| -rw-r--r-- | drivers/regulator/anatop-regulator.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c new file mode 100644 index 00000000000..818505f80a8 --- /dev/null +++ b/drivers/regulator/anatop-regulator.c @@ -0,0 +1,204 @@ +/* + * 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/regulator/driver.h> +#include <linux/regulator/anatop-regulator.h> +#include <linux/of.h> +#include <linux/regulator/of_regulator.h> + +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, rega, sel; + int uv; + + uv = min_uV; + pr_debug("%s: uv %d, min %d, max %d\n", __func__, + uv, anatop_reg->rdata->min_voltage, + anatop_reg->rdata->max_voltage); + + if (uv < anatop_reg->rdata->min_voltage + || uv > anatop_reg->rdata->max_voltage) { + if (max_uV > anatop_reg->rdata->min_voltage) + uv = anatop_reg->rdata->min_voltage; + else + return -EINVAL; + } + + if (anatop_reg->rdata->control_reg) { + sel = (uv - anatop_reg->rdata->min_voltage) / 25000; + val = anatop_reg->rdata->min_bit_val + sel; + rega = (ioread32(anatop_reg->rdata->ioreg) & + ~(anatop_reg->rdata->vol_bit_mask << + anatop_reg->rdata->vol_bit_shift)); + *selector = sel; + pr_debug("%s: calculated val %d\n", __func__, val); + iowrite32((val << anatop_reg->rdata->vol_bit_shift) | rega, + anatop_reg->rdata->ioreg); + return 0; + } else { + return -ENOTSUPP; + } +} + +static int anatop_get_voltage_sel(struct regulator_dev *reg) +{ + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); + int selector; + struct anatop_regulator_data *rdata = anatop_reg->rdata; + + if (rdata->control_reg) { + u32 val = (ioread32(rdata->ioreg) >> + rdata->vol_bit_shift) & rdata->vol_bit_mask; + selector = val - rdata->min_bit_val; + return selector; + } else { + return -ENOTSUPP; + } +} + +static int anatop_list_voltage(struct regulator_dev *dev, unsigned selector) +{ + struct anatop_regulator *anatop_reg = rdev_get_drvdata(dev); + int uv; + struct anatop_regulator_data *rdata = anatop_reg->rdata; + + uv = rdata->min_voltage + selector * 25000; + pr_debug("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, +}; + +int 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; + const __be32 *rval; + + initdata = of_get_regulator_init_data(dev, dev->of_node); + sreg = devm_kzalloc(dev, sizeof(struct anatop_regulator), GFP_KERNEL); + rdesc = devm_kzalloc(dev, sizeof(struct regulator_desc), GFP_KERNEL); + sreg->initdata = initdata; + sreg->regulator = rdesc; + if (!rdesc) { + return -EINVAL; + } + memset(rdesc,0,sizeof(struct regulator_desc)); + rdesc->name = kstrdup(of_get_property(np, "regulator-name", NULL), GFP_KERNEL); + rdesc->ops = &anatop_rops; + rdesc->type = REGULATOR_VOLTAGE; + rdesc->owner = THIS_MODULE; + sreg->rdata = devm_kzalloc(dev, sizeof(struct anatop_regulator_data), GFP_KERNEL); + sreg->rdata->name = kstrdup(rdesc->name, GFP_KERNEL); + rval = of_get_property(np, "control-reg",NULL); + if (rval) { + sreg->rdata->control_reg = be32_to_cpu(*rval); + } + sreg->rdata->ioreg = ioremap(sreg->rdata->control_reg,4); + rval = of_get_property(np, "vol-bit-shift",NULL); + if (rval) { + sreg->rdata->vol_bit_shift = be32_to_cpu(*rval); + } + rval = of_get_property(np, "vol-bit-mask",NULL); + if (rval) { + sreg->rdata->vol_bit_mask = be32_to_cpu(*rval); + } + rval = of_get_property(np, "min-bit-val",NULL); + if (rval) { + sreg->rdata->min_bit_val = be32_to_cpu(*rval); + } + rval = of_get_property(np, "min-voltage",NULL); + if (rval) { + sreg->rdata->min_voltage = be32_to_cpu(*rval); + } + rval = of_get_property(np, "max-voltage",NULL); + if (rval) { + sreg->rdata->max_voltage = be32_to_cpu(*rval); + } + + /* register regulator */ + rdev = regulator_register(rdesc, &pdev->dev, + initdata, sreg, pdev->dev.of_node); + platform_set_drvdata(pdev, rdev); + + if (IS_ERR(rdev)) { + dev_err(&pdev->dev, "failed to register %s\n", + rdesc->name); + return PTR_ERR(rdev); + } + + return 0; +} + +int anatop_regulator_remove(struct platform_device *pdev) +{ + struct regulator_dev *rdev = platform_get_drvdata(pdev); + regulator_unregister(rdev); + return 0; +} + +struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = { + { .compatible = "fsl,anatop-regulator", }, + { /* end */ } +}; + + +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, +}; + +int anatop_regulator_init(void) +{ + return platform_driver_register(&anatop_regulator); +} + +void anatop_regulator_exit(void) +{ + platform_driver_unregister(&anatop_regulator); +} + +postcore_initcall(anatop_regulator_init); +module_exit(anatop_regulator_exit); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("ANATOP Regulator driver"); +MODULE_LICENSE("GPL"); |