473 lines
12 KiB
C
473 lines
12 KiB
C
/*
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* tps62360.c -- TI tps62360
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*
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* Driver for processor core supply tps62360 and tps62361B
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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/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/delay.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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enum chips {TPS62360, TPS62361};
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#define TPS62360_BASE_VOLTAGE 770
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#define TPS62360_N_VOLTAGES 64
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#define TPS62361_BASE_VOLTAGE 500
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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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const char *name;
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struct device *dev;
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struct regulator_desc desc;
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struct i2c_client *client;
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struct regulator_dev *rdev;
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struct regmap *regmap;
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int chip_id;
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int vsel0_gpio;
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int vsel1_gpio;
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int voltage_base;
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u8 voltage_reg_mask;
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bool en_internal_pulldn;
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bool en_force_pwm;
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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(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: Error in reading register %d\n",
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__func__, REG_VSET0 + tps->curr_vset_id);
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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 (tps->voltage_base + vsel * 10) * 1000;
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}
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static int tps62360_dcdc_set_voltage(struct regulator_dev *dev,
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int min_uV, int max_uV, unsigned *selector)
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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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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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if (max_uV < min_uV)
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return -EINVAL;
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if (min_uV >
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((tps->voltage_base + (tps->desc.n_voltages - 1) * 10) * 1000))
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return -EINVAL;
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if (max_uV < tps->voltage_base * 1000)
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return -EINVAL;
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vsel = DIV_ROUND_UP(min_uV - (tps->voltage_base * 1000), 10000);
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if (selector)
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*selector = (vsel & tps->voltage_reg_mask);
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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, vsel, &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, vsel);
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if (ret < 0) {
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dev_err(tps->dev, "%s: Error in updating register %d\n",
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__func__, REG_VSET0 + new_vset_id);
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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] = vsel;
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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,
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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_dcdc_list_voltage(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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if (selector >= tps->desc.n_voltages)
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return -EINVAL;
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return (tps->voltage_base + selector * 10) * 1000;
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}
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static struct regulator_ops tps62360_dcdc_ops = {
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.get_voltage = tps62360_dcdc_get_voltage,
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.set_voltage = tps62360_dcdc_set_voltage,
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.list_voltage = tps62360_dcdc_list_voltage,
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};
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static int tps62360_init_force_pwm(struct tps62360_chip *tps,
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struct tps62360_regulator_platform_data *pdata,
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int vset_id)
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{
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unsigned int data;
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int ret;
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ret = regmap_read(tps->regmap, REG_VSET0 + vset_id, &data);
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if (ret < 0) {
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dev_err(tps->dev, "%s() fails in writing reg %d\n",
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__func__, REG_VSET0 + vset_id);
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return ret;
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}
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tps->curr_vset_vsel[vset_id] = data & tps->voltage_reg_mask;
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if (pdata->en_force_pwm)
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data |= BIT(7);
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else
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data &= ~BIT(7);
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ret = regmap_write(tps->regmap, REG_VSET0 + vset_id, data);
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if (ret < 0)
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dev_err(tps->dev, "%s() fails in writing reg %d\n",
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__func__, REG_VSET0 + vset_id);
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return ret;
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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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int i;
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/* Initailize 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, "%s() fails in writing reg %d\n",
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__func__, REG_CONTROL);
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return ret;
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}
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/* Initailize force PWM mode */
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if (tps->valid_gpios) {
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for (i = 0; i < 4; ++i) {
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ret = tps62360_init_force_pwm(tps, pdata, i);
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if (ret < 0)
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return ret;
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}
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} else {
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ret = tps62360_init_force_pwm(tps, pdata, tps->curr_vset_id);
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if (ret < 0)
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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, "%s() fails in updating reg %d\n",
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__func__, REG_RAMPCTRL);
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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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};
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static int __devinit 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 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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pdata = client->dev.platform_data;
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if (!pdata) {
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dev_err(&client->dev, "%s() Err: 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() Err: Memory allocation fails\n",
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__func__);
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return -ENOMEM;
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}
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tps->en_force_pwm = pdata->en_force_pwm;
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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->client = client;
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tps->dev = &client->dev;
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tps->name = id->name;
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tps->voltage_base = (id->driver_data == TPS62360) ?
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TPS62360_BASE_VOLTAGE : TPS62361_BASE_VOLTAGE;
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tps->voltage_reg_mask = (id->driver_data == TPS62360) ? 0x3F : 0x7F;
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tps->desc.name = id->name;
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tps->desc.id = 0;
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tps->desc.n_voltages = (id->driver_data == TPS62360) ?
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TPS62360_N_VOLTAGES : TPS62361_N_VOLTAGES;
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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->regmap = 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, "%s() Err: Failed to allocate register"
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"map: %d\n", __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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ret = gpio_request(tps->vsel0_gpio, "tps62360-vsel0");
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if (ret) {
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dev_err(&client->dev,
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"Err: Could not obtain vsel0 GPIO %d: %d\n",
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tps->vsel0_gpio, ret);
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goto err_gpio0;
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}
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ret = gpio_direction_output(tps->vsel0_gpio,
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pdata->vsel0_def_state);
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if (ret) {
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dev_err(&client->dev, "Err: Could not set direction of"
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"vsel0 GPIO %d: %d\n", tps->vsel0_gpio, ret);
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gpio_free(tps->vsel0_gpio);
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goto err_gpio0;
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}
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ret = gpio_request(tps->vsel1_gpio, "tps62360-vsel1");
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if (ret) {
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dev_err(&client->dev,
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"Err: Could not obtain vsel1 GPIO %d: %d\n",
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tps->vsel1_gpio, ret);
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goto err_gpio1;
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}
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ret = gpio_direction_output(tps->vsel1_gpio,
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pdata->vsel1_def_state);
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if (ret) {
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dev_err(&client->dev, "Err: Could not set direction of"
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"vsel1 GPIO %d: %d\n", tps->vsel1_gpio, ret);
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gpio_free(tps->vsel1_gpio);
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goto err_gpio1;
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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) {
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dev_err(tps->dev, "%s() Err: Init fails with = %d\n",
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__func__, ret);
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goto err_init;
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}
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/* Register the regulators */
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rdev = regulator_register(&tps->desc, &client->dev,
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&pdata->reg_init_data, tps, NULL);
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if (IS_ERR(rdev)) {
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dev_err(tps->dev, "%s() Err: Failed to register %s\n",
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__func__, id->name);
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ret = PTR_ERR(rdev);
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goto err_init;
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}
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tps->rdev = rdev;
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return 0;
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err_init:
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if (gpio_is_valid(tps->vsel1_gpio))
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gpio_free(tps->vsel1_gpio);
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err_gpio1:
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if (gpio_is_valid(tps->vsel0_gpio))
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gpio_free(tps->vsel0_gpio);
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err_gpio0:
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regmap_exit(tps->regmap);
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return ret;
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}
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/**
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* tps62360_remove - tps62360 driver i2c remove handler
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* @client: i2c driver client device structure
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*
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* Unregister TPS driver as an i2c client device driver
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*/
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static int __devexit tps62360_remove(struct i2c_client *client)
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{
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struct tps62360_chip *tps = i2c_get_clientdata(client);
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if (gpio_is_valid(tps->vsel1_gpio))
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gpio_free(tps->vsel1_gpio);
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if (gpio_is_valid(tps->vsel0_gpio))
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gpio_free(tps->vsel0_gpio);
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regulator_unregister(tps->rdev);
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regmap_exit(tps->regmap);
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return 0;
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}
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static void tps62360_shutdown(struct i2c_client *client)
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{
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struct tps62360_chip *tps = i2c_get_clientdata(client);
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int st;
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if (!tps->en_discharge)
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return;
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/* Configure the output discharge path */
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st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
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if (st < 0)
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dev_err(tps->dev, "%s() fails in updating reg %d\n",
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__func__, REG_RAMPCTRL);
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}
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static const struct i2c_device_id tps62360_id[] = {
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{.name = "tps62360", .driver_data = TPS62360},
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{.name = "tps62361", .driver_data = TPS62361},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, tps62360_id);
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static struct i2c_driver tps62360_i2c_driver = {
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.driver = {
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.name = "tps62360",
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.owner = THIS_MODULE,
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},
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.probe = tps62360_probe,
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.remove = __devexit_p(tps62360_remove),
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.shutdown = tps62360_shutdown,
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.id_table = tps62360_id,
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};
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static int __init tps62360_init(void)
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{
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return i2c_add_driver(&tps62360_i2c_driver);
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}
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subsys_initcall(tps62360_init);
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static void __exit tps62360_cleanup(void)
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{
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i2c_del_driver(&tps62360_i2c_driver);
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}
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module_exit(tps62360_cleanup);
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_DESCRIPTION("TPS62360 voltage regulator driver");
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MODULE_LICENSE("GPL v2");
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