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539 lines
14 KiB
539 lines
14 KiB
/* |
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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 <[email protected]> |
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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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|
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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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|
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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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|
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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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/* |
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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 const 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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const struct regulator_desc *desc) |
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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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return NULL; |
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pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node, |
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desc); |
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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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tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
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if (!tps) |
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return -ENOMEM; |
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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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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)(long)match->data; |
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if (!pdata) |
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pdata = of_get_tps62360_platform_data(&client->dev, |
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&tps->desc); |
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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->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->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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|
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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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/* |
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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(): Init 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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|
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config.dev = &client->dev; |
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config.init_data = pdata->reg_init_data; |
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config.driver_data = tps; |
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config.of_node = client->dev.of_node; |
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|
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/* Register the regulators */ |
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rdev = devm_regulator_register(&client->dev, &tps->desc, &config); |
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if (IS_ERR(rdev)) { |
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dev_err(tps->dev, |
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"%s(): regulator register failed with err %s\n", |
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__func__, id->name); |
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return PTR_ERR(rdev); |
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} |
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tps->rdev = rdev; |
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return 0; |
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} |
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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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|
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if (!tps->en_discharge) |
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return; |
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|
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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, |
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"%s(): register %d update failed with err %d\n", |
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__func__, REG_RAMPCTRL, st); |
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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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{.name = "tps62362", .driver_data = TPS62362}, |
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{.name = "tps62363", .driver_data = TPS62363}, |
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{}, |
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}; |
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|
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MODULE_DEVICE_TABLE(i2c, tps62360_id); |
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|
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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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.of_match_table = of_match_ptr(tps62360_of_match), |
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}, |
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.probe = tps62360_probe, |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("TPS6236x voltage regulator driver"); |
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MODULE_LICENSE("GPL v2");
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