543 lines
14 KiB
C
543 lines
14 KiB
C
/*
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* tps62360.c -- TI tps62360
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*
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* Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
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*
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* Copyright (c) 2012, NVIDIA Corporation.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
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* whether express or implied; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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
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* 02111-1307, USA
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*/
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#include <linux/kernel.h>
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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/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/regulator/of_regulator.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/regulator/tps62360.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/regmap.h>
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/* Register definitions */
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#define REG_VSET0 0
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#define REG_VSET1 1
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#define REG_VSET2 2
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#define REG_VSET3 3
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#define REG_CONTROL 4
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#define REG_TEMP 5
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#define REG_RAMPCTRL 6
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#define REG_CHIPID 8
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#define FORCE_PWM_ENABLE BIT(7)
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enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
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#define TPS62360_BASE_VOLTAGE 770000
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#define TPS62360_N_VOLTAGES 64
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#define TPS62361_BASE_VOLTAGE 500000
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#define TPS62361_N_VOLTAGES 128
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/* tps 62360 chip information */
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struct tps62360_chip {
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struct device *dev;
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struct regulator_desc desc;
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struct regulator_dev *rdev;
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struct regmap *regmap;
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int vsel0_gpio;
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int vsel1_gpio;
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u8 voltage_reg_mask;
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bool en_internal_pulldn;
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bool en_discharge;
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bool valid_gpios;
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int lru_index[4];
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int curr_vset_vsel[4];
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int curr_vset_id;
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};
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/*
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* find_voltage_set_register: Find new voltage configuration register
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* (VSET) id.
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* The finding of the new VSET register will be based on the LRU mechanism.
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* Each VSET register will have different voltage configured . This
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* Function will look if any of the VSET register have requested voltage set
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* or not.
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* - If it is already there then it will make that register as most
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* recently used and return as found so that caller need not to set
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* the VSET register but need to set the proper gpios to select this
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* VSET register.
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* - If requested voltage is not found then it will use the least
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* recently mechanism to get new VSET register for new configuration
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* and will return not_found so that caller need to set new VSET
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* register and then gpios (both).
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*/
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static bool find_voltage_set_register(struct tps62360_chip *tps,
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int req_vsel, int *vset_reg_id)
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{
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int i;
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bool found = false;
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int new_vset_reg = tps->lru_index[3];
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int found_index = 3;
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for (i = 0; i < 4; ++i) {
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if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
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new_vset_reg = tps->lru_index[i];
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found_index = i;
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found = true;
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goto update_lru_index;
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}
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}
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update_lru_index:
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for (i = found_index; i > 0; i--)
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tps->lru_index[i] = tps->lru_index[i - 1];
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tps->lru_index[0] = new_vset_reg;
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*vset_reg_id = new_vset_reg;
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return found;
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}
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static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
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{
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struct tps62360_chip *tps = rdev_get_drvdata(dev);
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int vsel;
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unsigned int data;
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int ret;
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ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
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if (ret < 0) {
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dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
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__func__, REG_VSET0 + tps->curr_vset_id, ret);
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return ret;
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}
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vsel = (int)data & tps->voltage_reg_mask;
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return vsel;
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}
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static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
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unsigned selector)
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{
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struct tps62360_chip *tps = rdev_get_drvdata(dev);
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int ret;
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bool found = false;
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int new_vset_id = tps->curr_vset_id;
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/*
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* If gpios are available to select the VSET register then least
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* recently used register for new configuration.
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*/
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if (tps->valid_gpios)
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found = find_voltage_set_register(tps, selector, &new_vset_id);
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if (!found) {
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ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
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tps->voltage_reg_mask, selector);
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if (ret < 0) {
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dev_err(tps->dev,
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"%s(): register %d update failed with err %d\n",
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__func__, REG_VSET0 + new_vset_id, ret);
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return ret;
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}
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tps->curr_vset_id = new_vset_id;
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tps->curr_vset_vsel[new_vset_id] = selector;
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}
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/* Select proper VSET register vio gpios */
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if (tps->valid_gpios) {
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gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
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gpio_set_value_cansleep(tps->vsel1_gpio,
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(new_vset_id >> 1) & 0x1);
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}
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return 0;
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}
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static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct tps62360_chip *tps = rdev_get_drvdata(rdev);
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int i;
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int val;
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int ret;
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/* Enable force PWM mode in FAST mode only. */
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switch (mode) {
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case REGULATOR_MODE_FAST:
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val = FORCE_PWM_ENABLE;
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break;
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case REGULATOR_MODE_NORMAL:
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val = 0;
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break;
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default:
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return -EINVAL;
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}
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if (!tps->valid_gpios) {
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ret = regmap_update_bits(tps->regmap,
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REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
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if (ret < 0)
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dev_err(tps->dev,
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"%s(): register %d update failed with err %d\n",
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__func__, REG_VSET0 + tps->curr_vset_id, ret);
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return ret;
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}
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/* If gpios are valid then all register set need to be control */
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for (i = 0; i < 4; ++i) {
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ret = regmap_update_bits(tps->regmap,
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REG_VSET0 + i, FORCE_PWM_ENABLE, val);
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if (ret < 0) {
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dev_err(tps->dev,
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"%s(): register %d update failed with err %d\n",
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__func__, REG_VSET0 + i, ret);
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return ret;
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}
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}
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return ret;
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}
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static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
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{
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struct tps62360_chip *tps = rdev_get_drvdata(rdev);
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unsigned int data;
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int ret;
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ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
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if (ret < 0) {
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dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
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__func__, REG_VSET0 + tps->curr_vset_id, ret);
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return ret;
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}
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return (data & FORCE_PWM_ENABLE) ?
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REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
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}
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static struct regulator_ops tps62360_dcdc_ops = {
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.get_voltage_sel = tps62360_dcdc_get_voltage_sel,
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.set_voltage_sel = tps62360_dcdc_set_voltage_sel,
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_mode = tps62360_set_mode,
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.get_mode = tps62360_get_mode,
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};
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static int tps62360_init_dcdc(struct tps62360_chip *tps,
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struct tps62360_regulator_platform_data *pdata)
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{
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int ret;
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unsigned int ramp_ctrl;
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/* Initialize internal pull up/down control */
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if (tps->en_internal_pulldn)
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ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
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else
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ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
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if (ret < 0) {
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dev_err(tps->dev,
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"%s(): register %d write failed with err %d\n",
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__func__, REG_CONTROL, ret);
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return ret;
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}
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/* Reset output discharge path to reduce power consumption */
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ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
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if (ret < 0) {
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dev_err(tps->dev,
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"%s(): register %d update failed with err %d\n",
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__func__, REG_RAMPCTRL, ret);
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return ret;
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}
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/* Get ramp value from ramp control register */
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ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
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if (ret < 0) {
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dev_err(tps->dev,
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"%s(): register %d read failed with err %d\n",
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__func__, REG_RAMPCTRL, ret);
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return ret;
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}
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ramp_ctrl = (ramp_ctrl >> 5) & 0x7;
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/* ramp mV/us = 32/(2^ramp_ctrl) */
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tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
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return ret;
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}
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static const struct regmap_config tps62360_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = REG_CHIPID,
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.cache_type = REGCACHE_RBTREE,
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};
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static struct tps62360_regulator_platform_data *
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of_get_tps62360_platform_data(struct device *dev)
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{
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struct tps62360_regulator_platform_data *pdata;
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struct device_node *np = dev->of_node;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(dev, "Memory alloc failed for platform data\n");
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return NULL;
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}
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pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
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if (!pdata->reg_init_data) {
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dev_err(dev, "Not able to get OF regulator init data\n");
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return NULL;
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}
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pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
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pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
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if (of_find_property(np, "ti,vsel0-state-high", NULL))
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pdata->vsel0_def_state = 1;
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if (of_find_property(np, "ti,vsel1-state-high", NULL))
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pdata->vsel1_def_state = 1;
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if (of_find_property(np, "ti,enable-pull-down", NULL))
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pdata->en_internal_pulldn = true;
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if (of_find_property(np, "ti,enable-vout-discharge", NULL))
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pdata->en_discharge = true;
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return pdata;
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}
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#if defined(CONFIG_OF)
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static const struct of_device_id tps62360_of_match[] = {
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{ .compatible = "ti,tps62360", .data = (void *)TPS62360},
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{ .compatible = "ti,tps62361", .data = (void *)TPS62361},
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{ .compatible = "ti,tps62362", .data = (void *)TPS62362},
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{ .compatible = "ti,tps62363", .data = (void *)TPS62363},
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{},
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};
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MODULE_DEVICE_TABLE(of, tps62360_of_match);
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#endif
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static int tps62360_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct regulator_config config = { };
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struct tps62360_regulator_platform_data *pdata;
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struct regulator_dev *rdev;
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struct tps62360_chip *tps;
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int ret;
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int i;
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int chip_id;
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pdata = dev_get_platdata(&client->dev);
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if (client->dev.of_node) {
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const struct of_device_id *match;
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match = of_match_device(of_match_ptr(tps62360_of_match),
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&client->dev);
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if (!match) {
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dev_err(&client->dev, "Error: No device match found\n");
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return -ENODEV;
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}
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chip_id = (int)match->data;
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if (!pdata)
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pdata = of_get_tps62360_platform_data(&client->dev);
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} else if (id) {
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chip_id = id->driver_data;
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} else {
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dev_err(&client->dev, "No device tree match or id table match found\n");
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return -ENODEV;
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}
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if (!pdata) {
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dev_err(&client->dev, "%s(): Platform data not found\n",
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__func__);
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return -EIO;
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}
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tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
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if (!tps) {
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dev_err(&client->dev, "%s(): Memory allocation failed\n",
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__func__);
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return -ENOMEM;
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}
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tps->en_discharge = pdata->en_discharge;
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tps->en_internal_pulldn = pdata->en_internal_pulldn;
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tps->vsel0_gpio = pdata->vsel0_gpio;
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tps->vsel1_gpio = pdata->vsel1_gpio;
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tps->dev = &client->dev;
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switch (chip_id) {
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case TPS62360:
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case TPS62362:
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tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
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tps->voltage_reg_mask = 0x3F;
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tps->desc.n_voltages = TPS62360_N_VOLTAGES;
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break;
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case TPS62361:
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case TPS62363:
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tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
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tps->voltage_reg_mask = 0x7F;
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tps->desc.n_voltages = TPS62361_N_VOLTAGES;
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break;
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default:
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return -ENODEV;
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}
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tps->desc.name = client->name;
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tps->desc.id = 0;
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tps->desc.ops = &tps62360_dcdc_ops;
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tps->desc.type = REGULATOR_VOLTAGE;
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tps->desc.owner = THIS_MODULE;
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tps->desc.uV_step = 10000;
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tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
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if (IS_ERR(tps->regmap)) {
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ret = PTR_ERR(tps->regmap);
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dev_err(&client->dev,
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"%s(): regmap allocation failed with err %d\n",
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__func__, ret);
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return ret;
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}
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i2c_set_clientdata(client, tps);
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tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
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(pdata->vsel0_def_state & 1);
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tps->lru_index[0] = tps->curr_vset_id;
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tps->valid_gpios = false;
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if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
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int gpio_flags;
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gpio_flags = (pdata->vsel0_def_state) ?
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GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
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ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
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gpio_flags, "tps62360-vsel0");
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if (ret) {
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dev_err(&client->dev,
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"%s(): Could not obtain vsel0 GPIO %d: %d\n",
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__func__, tps->vsel0_gpio, ret);
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return ret;
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}
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gpio_flags = (pdata->vsel1_def_state) ?
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GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
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ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
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gpio_flags, "tps62360-vsel1");
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if (ret) {
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dev_err(&client->dev,
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"%s(): Could not obtain vsel1 GPIO %d: %d\n",
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__func__, tps->vsel1_gpio, ret);
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return ret;
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}
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tps->valid_gpios = true;
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/*
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* Initialize the lru index with vset_reg id
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* The index 0 will be most recently used and
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* set with the tps->curr_vset_id */
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for (i = 0; i < 4; ++i)
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tps->lru_index[i] = i;
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tps->lru_index[0] = tps->curr_vset_id;
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tps->lru_index[tps->curr_vset_id] = 0;
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}
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ret = tps62360_init_dcdc(tps, pdata);
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if (ret < 0) {
|
|
dev_err(tps->dev, "%s(): Init failed with err = %d\n",
|
|
__func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
config.dev = &client->dev;
|
|
config.init_data = pdata->reg_init_data;
|
|
config.driver_data = tps;
|
|
config.of_node = client->dev.of_node;
|
|
|
|
/* Register the regulators */
|
|
rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
|
|
if (IS_ERR(rdev)) {
|
|
dev_err(tps->dev,
|
|
"%s(): regulator register failed with err %s\n",
|
|
__func__, id->name);
|
|
return PTR_ERR(rdev);
|
|
}
|
|
|
|
tps->rdev = rdev;
|
|
return 0;
|
|
}
|
|
|
|
static void tps62360_shutdown(struct i2c_client *client)
|
|
{
|
|
struct tps62360_chip *tps = i2c_get_clientdata(client);
|
|
int st;
|
|
|
|
if (!tps->en_discharge)
|
|
return;
|
|
|
|
/* Configure the output discharge path */
|
|
st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
|
|
if (st < 0)
|
|
dev_err(tps->dev,
|
|
"%s(): register %d update failed with err %d\n",
|
|
__func__, REG_RAMPCTRL, st);
|
|
}
|
|
|
|
static const struct i2c_device_id tps62360_id[] = {
|
|
{.name = "tps62360", .driver_data = TPS62360},
|
|
{.name = "tps62361", .driver_data = TPS62361},
|
|
{.name = "tps62362", .driver_data = TPS62362},
|
|
{.name = "tps62363", .driver_data = TPS62363},
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, tps62360_id);
|
|
|
|
static struct i2c_driver tps62360_i2c_driver = {
|
|
.driver = {
|
|
.name = "tps62360",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(tps62360_of_match),
|
|
},
|
|
.probe = tps62360_probe,
|
|
.shutdown = tps62360_shutdown,
|
|
.id_table = tps62360_id,
|
|
};
|
|
|
|
static int __init tps62360_init(void)
|
|
{
|
|
return i2c_add_driver(&tps62360_i2c_driver);
|
|
}
|
|
subsys_initcall(tps62360_init);
|
|
|
|
static void __exit tps62360_cleanup(void)
|
|
{
|
|
i2c_del_driver(&tps62360_i2c_driver);
|
|
}
|
|
module_exit(tps62360_cleanup);
|
|
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|
|
MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
|
|
MODULE_LICENSE("GPL v2");
|