441 lines
12 KiB
C
441 lines
12 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License v2
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*
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* Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
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*
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* AB8500 peripheral regulators
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*
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* AB8500 supports the following regulators,
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* LDOs - VAUDIO, VANAMIC2/2, VDIGMIC, VINTCORE12, VTVOUT,
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* VAUX1/2/3, VANA
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*
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* for DB8500 cut 1.0 and previous versions of the silicon, all accesses
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* to registers are through the DB8500 SPI. In cut 1.1 onwards, these
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* accesses are through the DB8500 PRCMU I2C
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*
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/ab8500.h>
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#include <linux/mfd/abx500.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/regulator/ab8500.h>
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/**
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* struct ab8500_regulator_info - ab8500 regulator information
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* @desc: regulator description
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* @ab8500: ab8500 parent
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* @regulator_dev: regulator device
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* @max_uV: maximum voltage (for variable voltage supplies)
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* @min_uV: minimum voltage (for variable voltage supplies)
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* @fixed_uV: typical voltage (for fixed voltage supplies)
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* @update_bank: bank to control on/off
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* @update_reg: register to control on/off
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* @mask: mask to enable/disable regulator
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* @enable: bits to enable the regulator in normal(high power) mode
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* @voltage_bank: bank to control regulator voltage
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* @voltage_reg: register to control regulator voltage
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* @voltage_mask: mask to control regulator voltage
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* @supported_voltages: supported voltage table
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* @voltages_len: number of supported voltages for the regulator
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*/
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struct ab8500_regulator_info {
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struct device *dev;
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struct regulator_desc desc;
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struct ab8500 *ab8500;
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struct regulator_dev *regulator;
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int max_uV;
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int min_uV;
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int fixed_uV;
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u8 update_bank;
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u8 update_reg;
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u8 mask;
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u8 enable;
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u8 voltage_bank;
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u8 voltage_reg;
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u8 voltage_mask;
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int const *supported_voltages;
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int voltages_len;
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};
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/* voltage tables for the vauxn/vintcore supplies */
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static const int ldo_vauxn_voltages[] = {
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1100000,
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1200000,
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1300000,
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1400000,
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1500000,
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1800000,
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1850000,
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1900000,
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2500000,
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2650000,
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2700000,
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2750000,
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2800000,
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2900000,
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3000000,
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3300000,
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};
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static const int ldo_vintcore_voltages[] = {
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1200000,
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1225000,
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1250000,
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1275000,
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1300000,
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1325000,
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1350000,
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};
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static int ab8500_regulator_enable(struct regulator_dev *rdev)
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{
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int regulator_id, ret;
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= AB8500_NUM_REGULATORS)
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return -EINVAL;
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ret = abx500_mask_and_set_register_interruptible(info->dev,
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info->update_bank, info->update_reg, info->mask, info->enable);
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if (ret < 0)
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dev_err(rdev_get_dev(rdev),
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"couldn't set enable bits for regulator\n");
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return ret;
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}
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static int ab8500_regulator_disable(struct regulator_dev *rdev)
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{
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int regulator_id, ret;
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= AB8500_NUM_REGULATORS)
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return -EINVAL;
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ret = abx500_mask_and_set_register_interruptible(info->dev,
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info->update_bank, info->update_reg, info->mask, 0x0);
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if (ret < 0)
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dev_err(rdev_get_dev(rdev),
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"couldn't set disable bits for regulator\n");
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return ret;
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}
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static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
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{
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int regulator_id, ret;
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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u8 value;
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= AB8500_NUM_REGULATORS)
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return -EINVAL;
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ret = abx500_get_register_interruptible(info->dev,
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info->update_bank, info->update_reg, &value);
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if (ret < 0) {
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dev_err(rdev_get_dev(rdev),
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"couldn't read 0x%x register\n", info->update_reg);
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return ret;
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}
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if (value & info->mask)
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return true;
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else
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return false;
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}
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static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector)
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{
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int regulator_id;
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= AB8500_NUM_REGULATORS)
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return -EINVAL;
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/* return the uV for the fixed regulators */
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if (info->fixed_uV)
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return info->fixed_uV;
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if (selector >= info->voltages_len)
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return -EINVAL;
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return info->supported_voltages[selector];
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}
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static int ab8500_regulator_get_voltage(struct regulator_dev *rdev)
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{
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int regulator_id, ret;
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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u8 value;
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= AB8500_NUM_REGULATORS)
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return -EINVAL;
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ret = abx500_get_register_interruptible(info->dev, info->voltage_bank,
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info->voltage_reg, &value);
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if (ret < 0) {
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dev_err(rdev_get_dev(rdev),
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"couldn't read voltage reg for regulator\n");
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return ret;
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}
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/* vintcore has a different layout */
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value &= info->voltage_mask;
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if (regulator_id == AB8500_LDO_INTCORE)
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ret = info->supported_voltages[value >> 0x3];
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else
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ret = info->supported_voltages[value];
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return ret;
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}
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static int ab8500_get_best_voltage_index(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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int i;
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/* check the supported voltage */
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for (i = 0; i < info->voltages_len; i++) {
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if ((info->supported_voltages[i] >= min_uV) &&
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(info->supported_voltages[i] <= max_uV))
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return i;
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}
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return -EINVAL;
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}
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static int ab8500_regulator_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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int regulator_id, ret;
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= AB8500_NUM_REGULATORS)
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return -EINVAL;
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/* get the appropriate voltages within the range */
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ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV);
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if (ret < 0) {
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dev_err(rdev_get_dev(rdev),
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"couldn't get best voltage for regulator\n");
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return ret;
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}
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/* set the registers for the request */
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ret = abx500_mask_and_set_register_interruptible(info->dev,
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info->voltage_bank, info->voltage_reg,
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info->voltage_mask, (u8)ret);
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if (ret < 0)
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dev_err(rdev_get_dev(rdev),
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"couldn't set voltage reg for regulator\n");
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return ret;
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}
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static struct regulator_ops ab8500_regulator_ops = {
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.enable = ab8500_regulator_enable,
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.disable = ab8500_regulator_disable,
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.is_enabled = ab8500_regulator_is_enabled,
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.get_voltage = ab8500_regulator_get_voltage,
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.set_voltage = ab8500_regulator_set_voltage,
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.list_voltage = ab8500_list_voltage,
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};
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static int ab8500_fixed_get_voltage(struct regulator_dev *rdev)
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{
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int regulator_id;
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struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
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regulator_id = rdev_get_id(rdev);
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if (regulator_id >= AB8500_NUM_REGULATORS)
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return -EINVAL;
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return info->fixed_uV;
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}
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static struct regulator_ops ab8500_ldo_fixed_ops = {
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.enable = ab8500_regulator_enable,
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.disable = ab8500_regulator_disable,
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.is_enabled = ab8500_regulator_is_enabled,
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.get_voltage = ab8500_fixed_get_voltage,
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.list_voltage = ab8500_list_voltage,
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};
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#define AB8500_LDO(_id, min, max, bank, reg, reg_mask, \
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reg_enable, volt_bank, volt_reg, volt_mask, \
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voltages, len_volts) \
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{ \
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.desc = { \
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.name = "LDO-" #_id, \
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.ops = &ab8500_regulator_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = AB8500_LDO_##_id, \
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.owner = THIS_MODULE, \
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}, \
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.min_uV = (min) * 1000, \
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.max_uV = (max) * 1000, \
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.update_bank = bank, \
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.update_reg = reg, \
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.mask = reg_mask, \
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.enable = reg_enable, \
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.voltage_bank = volt_bank, \
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.voltage_reg = volt_reg, \
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.voltage_mask = volt_mask, \
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.supported_voltages = voltages, \
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.voltages_len = len_volts, \
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.fixed_uV = 0, \
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}
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#define AB8500_FIXED_LDO(_id, fixed, bank, reg, \
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reg_mask, reg_enable) \
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{ \
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.desc = { \
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.name = "LDO-" #_id, \
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.ops = &ab8500_ldo_fixed_ops, \
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.type = REGULATOR_VOLTAGE, \
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.id = AB8500_LDO_##_id, \
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.owner = THIS_MODULE, \
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}, \
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.fixed_uV = fixed * 1000, \
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.update_bank = bank, \
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.update_reg = reg, \
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.mask = reg_mask, \
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.enable = reg_enable, \
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}
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static struct ab8500_regulator_info ab8500_regulator_info[] = {
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/*
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* Variable Voltage LDOs
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* name, min uV, max uV, ctrl bank, ctrl reg, reg mask, enable mask,
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* volt ctrl bank, volt ctrl reg, volt ctrl mask, volt table,
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* num supported volts
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*/
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AB8500_LDO(AUX1, 1100, 3300, 0x04, 0x09, 0x3, 0x1, 0x04, 0x1f, 0xf,
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ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
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AB8500_LDO(AUX2, 1100, 3300, 0x04, 0x09, 0xc, 0x4, 0x04, 0x20, 0xf,
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ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
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AB8500_LDO(AUX3, 1100, 3300, 0x04, 0x0a, 0x3, 0x1, 0x04, 0x21, 0xf,
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ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
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AB8500_LDO(INTCORE, 1100, 3300, 0x03, 0x80, 0x4, 0x4, 0x03, 0x80, 0x38,
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ldo_vintcore_voltages, ARRAY_SIZE(ldo_vintcore_voltages)),
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/*
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* Fixed Voltage LDOs
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* name, o/p uV, ctrl bank, ctrl reg, enable, disable
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*/
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AB8500_FIXED_LDO(TVOUT, 2000, 0x03, 0x80, 0x2, 0x2),
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AB8500_FIXED_LDO(AUDIO, 2000, 0x03, 0x83, 0x2, 0x2),
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AB8500_FIXED_LDO(ANAMIC1, 2050, 0x03, 0x83, 0x4, 0x4),
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AB8500_FIXED_LDO(ANAMIC2, 2050, 0x03, 0x83, 0x8, 0x8),
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AB8500_FIXED_LDO(DMIC, 1800, 0x03, 0x83, 0x10, 0x10),
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AB8500_FIXED_LDO(ANA, 1200, 0x03, 0x83, 0xc, 0x4),
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};
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static inline struct ab8500_regulator_info *find_regulator_info(int id)
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{
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struct ab8500_regulator_info *info;
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int i;
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for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
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info = &ab8500_regulator_info[i];
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if (info->desc.id == id)
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return info;
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}
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return NULL;
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}
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static __devinit int ab8500_regulator_probe(struct platform_device *pdev)
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{
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struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
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struct ab8500_platform_data *pdata;
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int i, err;
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if (!ab8500) {
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dev_err(&pdev->dev, "null mfd parent\n");
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return -EINVAL;
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}
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pdata = dev_get_platdata(ab8500->dev);
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/* register all regulators */
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for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
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struct ab8500_regulator_info *info = NULL;
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/* assign per-regulator data */
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info = &ab8500_regulator_info[i];
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info->dev = &pdev->dev;
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info->ab8500 = ab8500;
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info->regulator = regulator_register(&info->desc, &pdev->dev,
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pdata->regulator[i], info);
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if (IS_ERR(info->regulator)) {
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err = PTR_ERR(info->regulator);
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dev_err(&pdev->dev, "failed to register regulator %s\n",
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info->desc.name);
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/* when we fail, un-register all earlier regulators */
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while (--i >= 0) {
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info = &ab8500_regulator_info[i];
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regulator_unregister(info->regulator);
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}
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return err;
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}
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}
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return 0;
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}
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static __devexit int ab8500_regulator_remove(struct platform_device *pdev)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
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struct ab8500_regulator_info *info = NULL;
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info = &ab8500_regulator_info[i];
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regulator_unregister(info->regulator);
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}
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return 0;
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}
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static struct platform_driver ab8500_regulator_driver = {
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.probe = ab8500_regulator_probe,
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.remove = __devexit_p(ab8500_regulator_remove),
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.driver = {
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.name = "ab8500-regulator",
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.owner = THIS_MODULE,
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},
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};
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static int __init ab8500_regulator_init(void)
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{
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int ret;
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ret = platform_driver_register(&ab8500_regulator_driver);
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if (ret != 0)
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pr_err("Failed to register ab8500 regulator: %d\n", ret);
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return ret;
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}
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subsys_initcall(ab8500_regulator_init);
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static void __exit ab8500_regulator_exit(void)
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{
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platform_driver_unregister(&ab8500_regulator_driver);
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}
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module_exit(ab8500_regulator_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
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MODULE_DESCRIPTION("Regulator Driver for ST-Ericsson AB8500 Mixed-Sig PMIC");
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MODULE_ALIAS("platform:ab8500-regulator");
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