/* * 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 #include #include #include #include #include #include #include #include #include #include #include #define LDO_RAMP_UP_UNIT_IN_CYCLES 64 /* 64 cycles per step */ #define LDO_RAMP_UP_FREQ_IN_MHZ 24 /* cycle based on 24M OSC */ struct anatop_regulator { const char *name; u32 control_reg; struct regmap *anatop; int vol_bit_shift; int vol_bit_width; u32 delay_reg; int delay_bit_shift; int delay_bit_width; int min_bit_val; int min_voltage; int max_voltage; struct regulator_desc rdesc; struct regulator_init_data *initdata; }; static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg, unsigned selector) { struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); if (!anatop_reg->control_reg) return -ENOTSUPP; return regulator_set_voltage_sel_regmap(reg, selector); } static int anatop_regmap_set_voltage_time_sel(struct regulator_dev *reg, unsigned int old_sel, unsigned int new_sel) { struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); u32 val; int ret = 0; /* check whether need to care about LDO ramp up speed */ if (anatop_reg->delay_bit_width && new_sel > old_sel) { /* * the delay for LDO ramp up time is * based on the register setting, we need * to calculate how many steps LDO need to * ramp up, and how much delay needed. (us) */ regmap_read(anatop_reg->anatop, anatop_reg->delay_reg, &val); val = (val >> anatop_reg->delay_bit_shift) & ((1 << anatop_reg->delay_bit_width) - 1); ret = (new_sel - old_sel) * (LDO_RAMP_UP_UNIT_IN_CYCLES << val) / LDO_RAMP_UP_FREQ_IN_MHZ + 1; } return ret; } static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg) { struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); if (!anatop_reg->control_reg) return -ENOTSUPP; return regulator_get_voltage_sel_regmap(reg); } static struct regulator_ops anatop_rops = { .set_voltage_sel = anatop_regmap_set_voltage_sel, .set_voltage_time_sel = anatop_regmap_set_voltage_time_sel, .get_voltage_sel = anatop_regmap_get_voltage_sel, .list_voltage = regulator_list_voltage_linear, .map_voltage = regulator_map_voltage_linear, }; static int anatop_regulator_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct device_node *anatop_np; struct regulator_desc *rdesc; struct regulator_dev *rdev; struct anatop_regulator *sreg; struct regulator_init_data *initdata; struct regulator_config config = { }; 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 = of_get_property(np, "regulator-name", NULL); rdesc = &sreg->rdesc; rdesc->name = sreg->name; rdesc->ops = &anatop_rops; rdesc->type = REGULATOR_VOLTAGE; rdesc->owner = THIS_MODULE; anatop_np = of_get_parent(np); if (!anatop_np) return -ENODEV; sreg->anatop = syscon_node_to_regmap(anatop_np); of_node_put(anatop_np); if (IS_ERR(sreg->anatop)) return PTR_ERR(sreg->anatop); ret = of_property_read_u32(np, "anatop-reg-offset", &sreg->control_reg); if (ret) { dev_err(dev, "no anatop-reg-offset property set\n"); return ret; } 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"); return ret; } 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"); return ret; } 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"); return ret; } ret = of_property_read_u32(np, "anatop-min-voltage", &sreg->min_voltage); if (ret) { dev_err(dev, "no anatop-min-voltage property set\n"); return ret; } ret = of_property_read_u32(np, "anatop-max-voltage", &sreg->max_voltage); if (ret) { dev_err(dev, "no anatop-max-voltage property set\n"); return ret; } /* read LDO ramp up setting, only for core reg */ of_property_read_u32(np, "anatop-delay-reg-offset", &sreg->delay_reg); of_property_read_u32(np, "anatop-delay-bit-width", &sreg->delay_bit_width); of_property_read_u32(np, "anatop-delay-bit-shift", &sreg->delay_bit_shift); rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1 + sreg->min_bit_val; rdesc->min_uV = sreg->min_voltage; rdesc->uV_step = 25000; rdesc->linear_min_sel = sreg->min_bit_val; rdesc->vsel_reg = sreg->control_reg; rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) << sreg->vol_bit_shift; config.dev = &pdev->dev; config.init_data = initdata; config.driver_data = sreg; config.of_node = pdev->dev.of_node; config.regmap = sreg->anatop; /* register regulator */ rdev = devm_regulator_register(dev, rdesc, &config); if (IS_ERR(rdev)) { dev_err(dev, "failed to register %s\n", rdesc->name); return PTR_ERR(rdev); } platform_set_drvdata(pdev, rdev); return 0; } static struct of_device_id of_anatop_regulator_match_tbl[] = { { .compatible = "fsl,anatop-regulator", }, { /* end */ } }; static struct platform_driver anatop_regulator_driver = { .driver = { .name = "anatop_regulator", .owner = THIS_MODULE, .of_match_table = of_anatop_regulator_match_tbl, }, .probe = anatop_regulator_probe, }; static int __init anatop_regulator_init(void) { return platform_driver_register(&anatop_regulator_driver); } postcore_initcall(anatop_regulator_init); static void __exit anatop_regulator_exit(void) { platform_driver_unregister(&anatop_regulator_driver); } module_exit(anatop_regulator_exit); MODULE_AUTHOR("Nancy Chen "); MODULE_AUTHOR("Ying-Chun Liu (PaulLiu) "); MODULE_DESCRIPTION("ANATOP Regulator driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:anatop_regulator");