303 lines
8.5 KiB
C
303 lines
8.5 KiB
C
/*
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* pmic_basin_cove.c - Merrifield regulator driver
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* Copyright (c) 2013, Intel Corporation.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/intel_basin_cove_pmic.h>
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#include <linux/regulator/machine.h>
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#include <asm/intel_scu_pmic.h>
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/* Intel Voltage cntrl register parameters*/
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#define REG_ENA_STATUS_MASK 0x01
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#define REG_VSEL_MASK 0xc0
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#define VSEL_SHIFT 6
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#define REG_ON 0x01
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#define REG_OFF 0xfe
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const u16 reg_addr_offset[] = { VPROG1CNT_ADDR, VPROG2CNT_ADDR,
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VPROG3CNT_ADDR };
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/**
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* intel_pmic_reg_is_enabled - To check if the regulator is enabled
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* @rdev: regulator_dev structure
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* @return value : 1 - Regulator is ON
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* :0 - Regulator is OFF
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*/
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static int intel_pmic_reg_is_enabled(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg;
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int ret;
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/*FIXME: Is it ok to use the following IPC API*/
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ret = intel_scu_ipc_ioread8(pmic_info->pmic_reg, ®);
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if (ret) {
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dev_err(&rdev->dev,
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"intel_scu_ipc_ioread8 returns error %08x\n", ret);
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return ret;
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}
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return reg & REG_ENA_STATUS_MASK;
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}
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/**
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* intel_pmic_reg_enable - To enable the regulator
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* @rdev: regulator_dev structure
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* @return value : 0 - Regulator enabling success
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* :1 - Regulator enabling failed
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*/
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static int intel_pmic_reg_enable(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg;
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int ret;
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ret = intel_scu_ipc_ioread8(pmic_info->pmic_reg, ®);
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if (ret) {
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dev_err(&rdev->dev,
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"intel_scu_ipc_ioread8 returns error %08x\n", ret);
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return ret;
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}
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return intel_scu_ipc_iowrite8(pmic_info->pmic_reg, (reg | REG_ON));
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}
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/**
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* intel_pmic_reg_disable - To disable the regulator
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* @rdev: regulator_dev structure
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* @return value :0 - Regulator disabling success
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* :1 - Regulator disabling failed
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*/
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static int intel_pmic_reg_disable(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg;
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int ret;
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ret = intel_scu_ipc_ioread8(pmic_info->pmic_reg, ®);
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if (ret) {
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dev_err(&rdev->dev,
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"intel_scu_ipc_ioread8 returns error %08x\n", ret);
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return ret;
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}
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return intel_scu_ipc_iowrite8(pmic_info->pmic_reg,
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(reg & REG_OFF));
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}
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/**
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* intel_pmic_reg_listvoltage - Return the voltage value,this is called
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* from core framework
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* @rdev: regulator source
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* @index : passed on from core
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* @return value : Returns the value in micro volts.
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*/
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static int intel_pmic_reg_listvoltage(struct regulator_dev *rdev,
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unsigned index)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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if (index >= pmic_info->table_len) {
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dev_err(&rdev->dev, "Index out of range in listvoltage\n");
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return -EINVAL;
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}
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return pmic_info->table[index] * 1000;
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}
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/**
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* intel_pmic_reg_getvoltage - Return the current voltage value in uV
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* @rdev: regulator_dev structure
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* @return value : Returns the voltage value.
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*/
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static int intel_pmic_reg_getvoltage(struct regulator_dev *rdev)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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u8 reg, vsel;
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int ret;
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ret = intel_scu_ipc_ioread8(pmic_info->pmic_reg, ®);
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if (ret) {
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dev_err(&rdev->dev,
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"intel_scu_ipc_ioread8 returns error %08x\n", ret);
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return ret;
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}
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vsel = (reg & REG_VSEL_MASK) >> VSEL_SHIFT;
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if (vsel >= pmic_info->table_len) {
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dev_err(&rdev->dev, "vsel value is out of range\n");
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return -EINVAL;
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}
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dev_dbg(&rdev->dev, "Voltage value is %d mV\n",
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pmic_info->table[vsel]);
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return pmic_info->table[vsel] * 1000;
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}
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/**
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* intel_pmic_reg_setvoltage - Set voltage to the regulator
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* @rdev: regulator_dev structure
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* @min_uV: Minimum required voltage in uV
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* @max_uV: Maximum acceptable voltage in uV
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* @selector: Voltage value passed back to core layer
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* Sets a voltage regulator to the desired output voltage
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* @return value : Returns 0 if success
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* : Return error value on failure
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*/
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static int intel_pmic_reg_setvoltage(struct regulator_dev *rdev, int min_uV,
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int max_uV, unsigned *selector)
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{
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struct intel_pmic_info *pmic_info = rdev_get_drvdata(rdev);
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int ret;
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u8 reg, vsel;
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for (vsel = 0; vsel < pmic_info->table_len; vsel++) {
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int mV = pmic_info->table[vsel];
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int uV = mV * 1000;
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if (min_uV > uV || uV > max_uV)
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continue;
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*selector = vsel;
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ret = intel_scu_ipc_ioread8(pmic_info->pmic_reg, ®);
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if (ret) {
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dev_err(&rdev->dev,
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"intel_scu_ipc_ioread8 error %08x\n", ret);
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return ret;
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}
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reg &= ~REG_VSEL_MASK;
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reg |= vsel << VSEL_SHIFT;
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dev_dbg(&rdev->dev,
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"intel_pmic_reg_setvoltage voltage: %u uV\n", uV);
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return intel_scu_ipc_iowrite8(pmic_info->pmic_reg, reg);
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}
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return -EINVAL;
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}
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/* regulator_ops registration */
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static struct regulator_ops intel_pmic_ops = {
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.is_enabled = intel_pmic_reg_is_enabled,
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.enable = intel_pmic_reg_enable,
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.disable = intel_pmic_reg_disable,
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.get_voltage = intel_pmic_reg_getvoltage,
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.set_voltage = intel_pmic_reg_setvoltage,
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.list_voltage = intel_pmic_reg_listvoltage,
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};
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/**
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* struct regulator_desc - Regulator descriptor
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* Each regulator registered with the core is described with a structure of
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* this type.
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* @name: Identifying name for the regulator.
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* @id: Numerical identifier for the regulator.
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* @n_voltages: Number of selectors available for ops.list_voltage().
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* @ops: Regulator operations table.
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* @irq: Interrupt number for the regulator.
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* @type: Indicates if the regulator is a voltage or current regulator.
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* @owner: Module providing the regulator, used for refcounting.
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*/
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static struct regulator_desc intel_pmic_desc[] = {
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{
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.name = "vprog1",
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.id = VPROG1,
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.ops = &intel_pmic_ops,
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.n_voltages = ARRAY_SIZE(VPROG1_VSEL_table),
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "vprog2",
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.id = VPROG2,
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.ops = &intel_pmic_ops,
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.n_voltages = ARRAY_SIZE(VPROG2_VSEL_table),
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "vprog3",
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.id = VPROG3,
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.ops = &intel_pmic_ops,
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.n_voltages = ARRAY_SIZE(VPROG3_VSEL_table),
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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};
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static int basin_cove_pmic_probe(struct platform_device *pdev)
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{
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struct intel_pmic_info *pdata = dev_get_platdata(&pdev->dev);
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struct regulator_config config = { };
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unsigned int i;
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if (!pdata || !pdata->pmic_reg)
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return -EINVAL;
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config.dev = &pdev->dev;
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config.init_data = pdata->init_data;
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config.driver_data = pdata;
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for (i = 0; i < ARRAY_SIZE(reg_addr_offset); i++) {
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if (reg_addr_offset[i] == pdata->pmic_reg)
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break;
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}
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if (i == (ARRAY_SIZE(reg_addr_offset)))
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return -EINVAL;
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pdata->intel_pmic_rdev =
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regulator_register(&intel_pmic_desc[i], &config);
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if (IS_ERR(pdata->intel_pmic_rdev)) {
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dev_err(&pdev->dev, "can't register regulator..error %ld\n",
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PTR_ERR(pdata->intel_pmic_rdev));
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return PTR_ERR(pdata->intel_pmic_rdev);
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}
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platform_set_drvdata(pdev, pdata->intel_pmic_rdev);
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dev_dbg(&pdev->dev, "registered regulator\n");
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return 0;
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}
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static int basin_cove_pmic_remove(struct platform_device *pdev)
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{
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regulator_unregister(platform_get_drvdata(pdev));
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return 0;
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}
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static const struct platform_device_id basin_cove_id_table[] = {
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{ "intel_regulator", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(platform, basin_cove_id_table);
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static struct platform_driver basin_cove_pmic_driver = {
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.driver = {
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.name = "intel_regulator",
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.owner = THIS_MODULE,
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},
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.probe = basin_cove_pmic_probe,
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.remove = basin_cove_pmic_remove,
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.id_table = basin_cove_id_table,
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};
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static int __init basin_cove_pmic_init(void)
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{
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return platform_driver_register(&basin_cove_pmic_driver);
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}
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subsys_initcall(basin_cove_pmic_init);
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static void __exit basin_cove_pmic_exit(void)
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{
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platform_driver_unregister(&basin_cove_pmic_driver);
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}
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module_exit(basin_cove_pmic_exit);
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MODULE_DESCRIPTION("Basin Cove voltage regulator driver");
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MODULE_AUTHOR("Vishwesh/Mahesh/Sudarshan");
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MODULE_LICENSE("GPL v2");
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