552 строки
13 KiB
C
552 строки
13 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License v2
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* Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
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* Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
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*
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* Power domain regulators on DB8500
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/dbx500-prcmu.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/db8500-prcmu.h>
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#include <linux/module.h>
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/*
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* power state reference count
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*/
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static int power_state_active_cnt; /* will initialize to zero */
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static DEFINE_SPINLOCK(power_state_active_lock);
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static void power_state_active_enable(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&power_state_active_lock, flags);
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power_state_active_cnt++;
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spin_unlock_irqrestore(&power_state_active_lock, flags);
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}
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static int power_state_active_disable(void)
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{
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int ret = 0;
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unsigned long flags;
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spin_lock_irqsave(&power_state_active_lock, flags);
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if (power_state_active_cnt <= 0) {
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pr_err("power state: unbalanced enable/disable calls\n");
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ret = -EINVAL;
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goto out;
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}
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power_state_active_cnt--;
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out:
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spin_unlock_irqrestore(&power_state_active_lock, flags);
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return ret;
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}
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/*
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* Exported interface for CPUIdle only. This function is called when interrupts
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* are turned off. Hence, no locking.
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*/
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int power_state_active_is_enabled(void)
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{
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return (power_state_active_cnt > 0);
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}
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/**
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* struct db8500_regulator_info - db8500 regulator information
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* @dev: device pointer
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* @desc: regulator description
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* @rdev: regulator device pointer
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* @is_enabled: status of the regulator
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* @epod_id: id for EPOD (power domain)
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* @is_ramret: RAM retention switch for EPOD (power domain)
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* @operating_point: operating point (only for vape, to be removed)
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*
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*/
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struct db8500_regulator_info {
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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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bool is_enabled;
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u16 epod_id;
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bool is_ramret;
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bool exclude_from_power_state;
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unsigned int operating_point;
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};
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static int db8500_regulator_enable(struct regulator_dev *rdev)
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{
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struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
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if (info == NULL)
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return -EINVAL;
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dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n",
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info->desc.name);
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info->is_enabled = true;
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if (!info->exclude_from_power_state)
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power_state_active_enable();
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return 0;
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}
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static int db8500_regulator_disable(struct regulator_dev *rdev)
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{
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struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
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int ret = 0;
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if (info == NULL)
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return -EINVAL;
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dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n",
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info->desc.name);
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info->is_enabled = false;
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if (!info->exclude_from_power_state)
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ret = power_state_active_disable();
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return ret;
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}
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static int db8500_regulator_is_enabled(struct regulator_dev *rdev)
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{
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struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
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if (info == NULL)
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return -EINVAL;
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dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):"
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" %i\n", info->desc.name, info->is_enabled);
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return info->is_enabled;
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}
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/* db8500 regulator operations */
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static struct regulator_ops db8500_regulator_ops = {
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.enable = db8500_regulator_enable,
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.disable = db8500_regulator_disable,
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.is_enabled = db8500_regulator_is_enabled,
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};
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/*
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* EPOD control
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*/
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static bool epod_on[NUM_EPOD_ID];
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static bool epod_ramret[NUM_EPOD_ID];
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static int enable_epod(u16 epod_id, bool ramret)
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{
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int ret;
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if (ramret) {
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if (!epod_on[epod_id]) {
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ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
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if (ret < 0)
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return ret;
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}
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epod_ramret[epod_id] = true;
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} else {
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ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
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if (ret < 0)
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return ret;
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epod_on[epod_id] = true;
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}
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return 0;
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}
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static int disable_epod(u16 epod_id, bool ramret)
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{
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int ret;
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if (ramret) {
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if (!epod_on[epod_id]) {
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ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
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if (ret < 0)
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return ret;
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}
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epod_ramret[epod_id] = false;
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} else {
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if (epod_ramret[epod_id]) {
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ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
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if (ret < 0)
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return ret;
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} else {
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ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
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if (ret < 0)
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return ret;
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}
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epod_on[epod_id] = false;
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}
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return 0;
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}
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/*
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* Regulator switch
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*/
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static int db8500_regulator_switch_enable(struct regulator_dev *rdev)
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{
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struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
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int ret;
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if (info == NULL)
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return -EINVAL;
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dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n",
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info->desc.name);
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ret = enable_epod(info->epod_id, info->is_ramret);
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if (ret < 0) {
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dev_err(rdev_get_dev(rdev),
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"regulator-switch-%s-enable: prcmu call failed\n",
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info->desc.name);
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goto out;
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}
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info->is_enabled = true;
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out:
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return ret;
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}
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static int db8500_regulator_switch_disable(struct regulator_dev *rdev)
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{
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struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
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int ret;
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if (info == NULL)
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return -EINVAL;
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dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n",
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info->desc.name);
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ret = disable_epod(info->epod_id, info->is_ramret);
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if (ret < 0) {
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dev_err(rdev_get_dev(rdev),
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"regulator_switch-%s-disable: prcmu call failed\n",
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info->desc.name);
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goto out;
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}
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info->is_enabled = 0;
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out:
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return ret;
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}
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static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev)
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{
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struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
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if (info == NULL)
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return -EINVAL;
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dev_vdbg(rdev_get_dev(rdev),
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"regulator-switch-%s-is_enabled (is_enabled): %i\n",
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info->desc.name, info->is_enabled);
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return info->is_enabled;
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}
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static struct regulator_ops db8500_regulator_switch_ops = {
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.enable = db8500_regulator_switch_enable,
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.disable = db8500_regulator_switch_disable,
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.is_enabled = db8500_regulator_switch_is_enabled,
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};
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/*
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* Regulator information
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*/
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static struct db8500_regulator_info
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db8500_regulator_info[DB8500_NUM_REGULATORS] = {
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[DB8500_REGULATOR_VAPE] = {
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.desc = {
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.name = "db8500-vape",
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.id = DB8500_REGULATOR_VAPE,
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.ops = &db8500_regulator_ops,
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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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[DB8500_REGULATOR_VARM] = {
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.desc = {
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.name = "db8500-varm",
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.id = DB8500_REGULATOR_VARM,
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.ops = &db8500_regulator_ops,
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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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[DB8500_REGULATOR_VMODEM] = {
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.desc = {
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.name = "db8500-vmodem",
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.id = DB8500_REGULATOR_VMODEM,
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.ops = &db8500_regulator_ops,
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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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[DB8500_REGULATOR_VPLL] = {
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.desc = {
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.name = "db8500-vpll",
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.id = DB8500_REGULATOR_VPLL,
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.ops = &db8500_regulator_ops,
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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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[DB8500_REGULATOR_VSMPS1] = {
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.desc = {
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.name = "db8500-vsmps1",
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.id = DB8500_REGULATOR_VSMPS1,
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.ops = &db8500_regulator_ops,
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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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[DB8500_REGULATOR_VSMPS2] = {
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.desc = {
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.name = "db8500-vsmps2",
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.id = DB8500_REGULATOR_VSMPS2,
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.ops = &db8500_regulator_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.exclude_from_power_state = true,
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},
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[DB8500_REGULATOR_VSMPS3] = {
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.desc = {
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.name = "db8500-vsmps3",
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.id = DB8500_REGULATOR_VSMPS3,
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.ops = &db8500_regulator_ops,
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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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[DB8500_REGULATOR_VRF1] = {
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.desc = {
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.name = "db8500-vrf1",
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.id = DB8500_REGULATOR_VRF1,
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.ops = &db8500_regulator_ops,
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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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[DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
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.desc = {
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.name = "db8500-sva-mmdsp",
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.id = DB8500_REGULATOR_SWITCH_SVAMMDSP,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_SVAMMDSP,
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},
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[DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
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.desc = {
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.name = "db8500-sva-mmdsp-ret",
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.id = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_SVAMMDSP,
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.is_ramret = true,
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},
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[DB8500_REGULATOR_SWITCH_SVAPIPE] = {
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.desc = {
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.name = "db8500-sva-pipe",
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.id = DB8500_REGULATOR_SWITCH_SVAPIPE,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_SVAPIPE,
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},
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[DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
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.desc = {
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.name = "db8500-sia-mmdsp",
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.id = DB8500_REGULATOR_SWITCH_SIAMMDSP,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_SIAMMDSP,
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},
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[DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
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.desc = {
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.name = "db8500-sia-mmdsp-ret",
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.id = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_SIAMMDSP,
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.is_ramret = true,
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},
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[DB8500_REGULATOR_SWITCH_SIAPIPE] = {
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.desc = {
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.name = "db8500-sia-pipe",
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.id = DB8500_REGULATOR_SWITCH_SIAPIPE,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_SIAPIPE,
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},
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[DB8500_REGULATOR_SWITCH_SGA] = {
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.desc = {
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.name = "db8500-sga",
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.id = DB8500_REGULATOR_SWITCH_SGA,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_SGA,
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},
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[DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
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.desc = {
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.name = "db8500-b2r2-mcde",
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.id = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_B2R2_MCDE,
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},
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[DB8500_REGULATOR_SWITCH_ESRAM12] = {
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.desc = {
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.name = "db8500-esram12",
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.id = DB8500_REGULATOR_SWITCH_ESRAM12,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_ESRAM12,
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.is_enabled = true,
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},
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[DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
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.desc = {
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.name = "db8500-esram12-ret",
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.id = DB8500_REGULATOR_SWITCH_ESRAM12RET,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_ESRAM12,
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.is_ramret = true,
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},
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[DB8500_REGULATOR_SWITCH_ESRAM34] = {
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.desc = {
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.name = "db8500-esram34",
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.id = DB8500_REGULATOR_SWITCH_ESRAM34,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_ESRAM34,
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.is_enabled = true,
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},
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[DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
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.desc = {
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.name = "db8500-esram34-ret",
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.id = DB8500_REGULATOR_SWITCH_ESRAM34RET,
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.ops = &db8500_regulator_switch_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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.epod_id = EPOD_ID_ESRAM34,
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.is_ramret = true,
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},
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};
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static int __devinit db8500_regulator_probe(struct platform_device *pdev)
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{
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struct regulator_init_data *db8500_init_data =
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dev_get_platdata(&pdev->dev);
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int i, err;
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/* register all regulators */
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for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) {
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struct db8500_regulator_info *info;
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struct regulator_init_data *init_data = &db8500_init_data[i];
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/* assign per-regulator data */
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info = &db8500_regulator_info[i];
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info->dev = &pdev->dev;
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/* register with the regulator framework */
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info->rdev = regulator_register(&info->desc, &pdev->dev,
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init_data, info, NULL);
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if (IS_ERR(info->rdev)) {
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err = PTR_ERR(info->rdev);
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dev_err(&pdev->dev, "failed to register %s: err %i\n",
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info->desc.name, err);
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/* if failing, unregister all earlier regulators */
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while (--i >= 0) {
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info = &db8500_regulator_info[i];
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regulator_unregister(info->rdev);
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}
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return err;
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}
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dev_dbg(rdev_get_dev(info->rdev),
|
|
"regulator-%s-probed\n", info->desc.name);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __exit db8500_regulator_remove(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) {
|
|
struct db8500_regulator_info *info;
|
|
info = &db8500_regulator_info[i];
|
|
|
|
dev_vdbg(rdev_get_dev(info->rdev),
|
|
"regulator-%s-remove\n", info->desc.name);
|
|
|
|
regulator_unregister(info->rdev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver db8500_regulator_driver = {
|
|
.driver = {
|
|
.name = "db8500-prcmu-regulators",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = db8500_regulator_probe,
|
|
.remove = __exit_p(db8500_regulator_remove),
|
|
};
|
|
|
|
static int __init db8500_regulator_init(void)
|
|
{
|
|
return platform_driver_register(&db8500_regulator_driver);
|
|
}
|
|
|
|
static void __exit db8500_regulator_exit(void)
|
|
{
|
|
platform_driver_unregister(&db8500_regulator_driver);
|
|
}
|
|
|
|
arch_initcall(db8500_regulator_init);
|
|
module_exit(db8500_regulator_exit);
|
|
|
|
MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
|
|
MODULE_DESCRIPTION("DB8500 regulator driver");
|
|
MODULE_LICENSE("GPL v2");
|