362 lines
9.7 KiB
C
362 lines
9.7 KiB
C
/*
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* pmic_crystal_cove_plus.c - CherryTrail regulator driver
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*
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* Copyright (c) 2014, Intel Corporation.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/mfd/intel_mid_pmic.h>
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#include <linux/regulator/intel_crystal_cove_plus_pmic.h>
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/* crystal cove plus pmic register parameters */
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#define CCOVEP_REG_VSEL_SHIFT 5
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#define CCOVEP_REG_VSEL_MASK 0xe0
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#define CCOVEP_REG_ENBL_MASK 0x01
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#define CCOVEP_REG_DSBL_MASK 0xfe
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#define CCOVEP_REG_ENBL_CTRL_MASK 0x02
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/* voltage control regulator offsets */
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/* buck boost regulators */
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#define CCOVEP_V3P3A_CTRL 0x5e
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#define CCOVEP_V3P3SX_CTRL 0x5f
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/* buck regulators */
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#define CCOVEP_V1P05A_CTRL 0x3b
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#define CCOVEP_V1P15_CTRL 0x3c
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#define CCOVEP_V1P8A_CTRL 0x56
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/* boot regulators */
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#define CCOVEP_V5P0A_CTRL 0x60
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/* linear regulators */
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#define CCOVEP_V2P8SX_CTRL 0x5d
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#define CCOVEP_VDDQ_CTRL 0x58
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/* voltage tables */
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static const unsigned int CCOVEP_V3P3A_VSEL_TABLE[] = {
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2970000, 3135000, 3300000, 3332000, 3340000, 3400000, 3465000, 3630000,
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};
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static const unsigned int CCOVEP_V3P3SX_VSEL_TABLE[] = {
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2970000, 3135000, 3300000, 3332000, 3340000, 3400000, 3465000, 3630000,
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};
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static const unsigned int CCOVEP_V1P05A_VSEL_TABLE[] = {
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945000, 998000, 1040000, 1050000, 1061000, 1071000, 1103000, 1155000,
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};
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static const unsigned int CCOVEP_V1P15_VSEL_TABLE[] = {
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1040000, 1090000, 1140000, 1150000, 1160000, 1170000, 1210000, 1270000,
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};
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static const unsigned int CCOVEP_V1P8A_VSEL_TABLE[] = {
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1635000, 1726000, 1799000, 1817000, 1835000, 1853000, 1908000, 1999000,
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};
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static const unsigned int CCOVEP_V5P0A_VSEL_TABLE[] = {
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4500000, 4750000, 5000000, 5048000, 5100000, 5100000, 5250000, 5500000,
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};
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static const unsigned int CCOVEP_V2P8SX_VSEL_TABLE[] = {
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2565000, 2700000, 2750000, 2800000, 2850000, 2900000, 3135000, 3300000,
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};
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static const unsigned int CCOVEP_VDDQ_VSEL_TABLE[] = {
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1080000, 1140000, 1200000, 1240000, 1350000, 1390000, 1418000, 1500000,
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};
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static int ccovep_regulator_enable(struct regulator_dev *rdev)
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{
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struct ccovep_regulator_info *pmic_info = rdev_get_drvdata(rdev);
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int reg_val;
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reg_val = intel_mid_pmic_readb(pmic_info->vol_reg);
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if (reg_val < 0) {
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dev_err(&rdev->dev, "error reading pmic, %x\n", reg_val);
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return reg_val;
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}
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return intel_mid_pmic_writeb(pmic_info->vol_reg,
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(reg_val | CCOVEP_REG_ENBL_MASK |
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CCOVEP_REG_ENBL_CTRL_MASK));
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}
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static int ccovep_regulator_disable(struct regulator_dev *rdev)
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{
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struct ccovep_regulator_info *pmic_info = rdev_get_drvdata(rdev);
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int reg_val;
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reg_val = intel_mid_pmic_readb(pmic_info->vol_reg);
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if (reg_val < 0) {
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dev_err(&rdev->dev, "error reading pmic, %x\n", reg_val);
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return reg_val;
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}
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return intel_mid_pmic_writeb(pmic_info->vol_reg,
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((reg_val | CCOVEP_REG_ENBL_CTRL_MASK) &
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CCOVEP_REG_DSBL_MASK));
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}
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static int ccovep_regulator_is_enabled(struct regulator_dev *rdev)
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{
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struct ccovep_regulator_info *pmic_info = rdev_get_drvdata(rdev);
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int reg_val;
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reg_val = intel_mid_pmic_readb(pmic_info->vol_reg);
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if (reg_val < 0) {
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dev_err(&rdev->dev, "error reading pmic, %x\n", reg_val);
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return reg_val;
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}
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if (!(reg_val & CCOVEP_REG_ENBL_CTRL_MASK))
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return -EINVAL;
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return reg_val & CCOVEP_REG_ENBL_MASK;
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}
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static int ccovep_regulator_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct ccovep_regulator_info *pmic_info = rdev_get_drvdata(rdev);
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int reg_val, vsel;
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reg_val = intel_mid_pmic_readb(pmic_info->vol_reg);
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if (reg_val < 0) {
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dev_err(&rdev->dev, "error reading pmic, %x\n", reg_val);
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return reg_val;
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}
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vsel = (reg_val & CCOVEP_REG_VSEL_MASK) >> CCOVEP_REG_VSEL_SHIFT;
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return vsel;
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}
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static int ccovep_regulator_set_voltage_sel(struct regulator_dev *rdev,
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unsigned selector)
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{
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struct ccovep_regulator_info *pmic_info = rdev_get_drvdata(rdev);
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int reg_val;
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reg_val = intel_mid_pmic_readb(pmic_info->vol_reg);
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if (reg_val < 0) {
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dev_err(&rdev->dev, "error reading pmic, %x\n", reg_val);
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return reg_val;
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}
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reg_val &= ~CCOVEP_REG_VSEL_MASK;
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reg_val |= selector << CCOVEP_REG_VSEL_SHIFT;
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return intel_mid_pmic_writeb(pmic_info->vol_reg, reg_val);
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}
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/* regulator ops */
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static struct regulator_ops ccovep_regulator_ops = {
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.enable = ccovep_regulator_enable,
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.disable = ccovep_regulator_disable,
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.is_enabled = ccovep_regulator_is_enabled,
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.get_voltage_sel = ccovep_regulator_get_voltage_sel,
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.set_voltage_sel = ccovep_regulator_set_voltage_sel,
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.list_voltage = regulator_list_voltage_table,
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};
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/* Regulator descriptions */
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static struct ccovep_regulator_info regulators_info[] = {
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{
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.desc = {
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.name = "v3p3a",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_V3P3A,
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.n_voltages = ARRAY_SIZE(CCOVEP_V3P3A_VSEL_TABLE),
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.volt_table = CCOVEP_V3P3A_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_V3P3A_CTRL,
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},
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{
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.desc = {
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.name = "v3p3sx",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_V3P3SX,
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.n_voltages = ARRAY_SIZE(CCOVEP_V3P3SX_VSEL_TABLE),
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.volt_table = CCOVEP_V3P3SX_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_V3P3SX_CTRL,
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},
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{
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.desc = {
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.name = "v1p05a",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_V1P05A,
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.n_voltages = ARRAY_SIZE(CCOVEP_V1P05A_VSEL_TABLE),
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.volt_table = CCOVEP_V1P05A_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_V1P05A_CTRL,
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},
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{
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.desc = {
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.name = "v1p15",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_V1P15,
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.n_voltages = ARRAY_SIZE(CCOVEP_V1P15_VSEL_TABLE),
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.volt_table = CCOVEP_V1P15_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_V1P15_CTRL,
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},
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{
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.desc = {
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.name = "v1p8a",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_V1P8A,
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.n_voltages = ARRAY_SIZE(CCOVEP_V1P8A_VSEL_TABLE),
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.volt_table = CCOVEP_V1P8A_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_V1P8A_CTRL,
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},
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{
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.desc = {
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.name = "v5p0a",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_V5P0A,
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.n_voltages = ARRAY_SIZE(CCOVEP_V5P0A_VSEL_TABLE),
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.volt_table = CCOVEP_V5P0A_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_V5P0A_CTRL,
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},
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{
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.desc = {
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.name = "v2p8sx",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_V2P8SX,
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.n_voltages = ARRAY_SIZE(CCOVEP_V2P8SX_VSEL_TABLE),
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.volt_table = CCOVEP_V2P8SX_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_V2P8SX_CTRL,
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},
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{
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.desc = {
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.name = "vddq",
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.ops = &ccovep_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.id = CCOVEP_ID_VDDQ,
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.n_voltages = ARRAY_SIZE(CCOVEP_VDDQ_VSEL_TABLE),
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.volt_table = CCOVEP_VDDQ_VSEL_TABLE,
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.owner = THIS_MODULE,
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},
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.vol_reg = CCOVEP_VDDQ_CTRL,
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},
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};
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static inline struct ccovep_regulator_info *ccovep_find_regulator_info(int id)
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{
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struct ccovep_regulator_info *reg_info;
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int i;
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for (i = 0; i < ARRAY_SIZE(regulators_info); i++) {
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if (regulators_info[i].desc.id == id) {
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reg_info = ®ulators_info[i];
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return reg_info;
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}
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}
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return NULL;
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}
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static int ccovep_regulator_probe(struct platform_device *pdev)
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{
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struct ccovep_regulator_info *pdata = dev_get_platdata(&pdev->dev);
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struct regulator_config config = { };
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struct ccovep_regulator_info *reg_info = NULL;
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if (!pdata) {
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dev_err(&pdev->dev, "No regulator info\n");
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return -EINVAL;
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}
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reg_info = ccovep_find_regulator_info(pdev->id);
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if (reg_info == NULL) {
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dev_err(&pdev->dev, "invalid regulator %d\n", pdev->id);
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return -EINVAL;
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}
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config.dev = &pdev->dev;
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config.init_data = pdata->init_data;
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config.driver_data = reg_info;
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pdata->regulator = regulator_register(®_info->desc, &config);
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if (IS_ERR(pdata->regulator)) {
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dev_err(&pdev->dev, "failed to register regulator as %s\n",
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reg_info->desc.name);
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return PTR_ERR(pdata->regulator);
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}
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platform_set_drvdata(pdev, pdata->regulator);
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dev_dbg(&pdev->dev, "registered crystal cove plus regulator as %s\n",
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dev_name(&pdata->regulator->dev));
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return 0;
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}
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static int ccovep_regulator_remove(struct platform_device *pdev)
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{
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regulator_unregister(platform_get_drvdata(pdev));
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return 0;
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}
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static const struct platform_device_id ccovep_regulator_id_table[] = {
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{ "ccovep_regulator", 0},
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{ },
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};
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MODULE_DEVICE_TABLE(platform, ccovep_regulator_id_table);
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static struct platform_driver ccovep_regulator_driver = {
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.driver = {
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.name = "ccovep_regulator",
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.owner = THIS_MODULE,
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},
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.probe = ccovep_regulator_probe,
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.remove = ccovep_regulator_remove,
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.id_table = ccovep_regulator_id_table,
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};
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static int __init ccovep_regulator_init(void)
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{
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return platform_driver_register(&ccovep_regulator_driver);
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}
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fs_initcall(ccovep_regulator_init);
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static void __exit ccovep_regulator_exit(void)
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{
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platform_driver_unregister(&ccovep_regulator_driver);
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}
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module_exit(ccovep_regulator_exit);
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MODULE_DESCRIPTION("CrystalCove Plus regulator driver");
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MODULE_AUTHOR("Nitheesh K L <nitheesh.k.l@intel.com");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:intel_regulator");
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