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linux-stable/drivers/regulator/db8500-prcmu.c
Bengt Jonsson 38e968380b regulators/db8500: split off shared dbx500 code 
As we progress with DB5500 and future voltage domain regulators
based on very similar hardware as found in the DB8500 PRCMU,
it makes sense to split off the generic parts and introduce
some generic debug code for the DBx500 regulators. This patch
accoplish a basic abstraction of the DBx500 voltage domain
regulators.

Signed-off-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-01-20 12:01:29 +00:00

497 lines
11 KiB
C
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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
* Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson
*
* Power domain regulators on DB8500
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/mfd/dbx500-prcmu.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/db8500-prcmu.h>
#include <linux/module.h>
#include "dbx500-prcmu.h"
static int db8500_regulator_enable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n",
info->desc.name);
if (!info->is_enabled) {
info->is_enabled = true;
if (!info->exclude_from_power_state)
power_state_active_enable();
}
return 0;
}
static int db8500_regulator_disable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret = 0;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n",
info->desc.name);
if (info->is_enabled) {
info->is_enabled = false;
if (!info->exclude_from_power_state)
ret = power_state_active_disable();
}
return ret;
}
static int db8500_regulator_is_enabled(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):"
" %i\n", info->desc.name, info->is_enabled);
return info->is_enabled;
}
/* db8500 regulator operations */
static struct regulator_ops db8500_regulator_ops = {
.enable = db8500_regulator_enable,
.disable = db8500_regulator_disable,
.is_enabled = db8500_regulator_is_enabled,
};
/*
* EPOD control
*/
static bool epod_on[NUM_EPOD_ID];
static bool epod_ramret[NUM_EPOD_ID];
static int enable_epod(u16 epod_id, bool ramret)
{
int ret;
if (ramret) {
if (!epod_on[epod_id]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
if (ret < 0)
return ret;
}
epod_ramret[epod_id] = true;
} else {
ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
if (ret < 0)
return ret;
epod_on[epod_id] = true;
}
return 0;
}
static int disable_epod(u16 epod_id, bool ramret)
{
int ret;
if (ramret) {
if (!epod_on[epod_id]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
if (ret < 0)
return ret;
}
epod_ramret[epod_id] = false;
} else {
if (epod_ramret[epod_id]) {
ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
if (ret < 0)
return ret;
} else {
ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
if (ret < 0)
return ret;
}
epod_on[epod_id] = false;
}
return 0;
}
/*
* Regulator switch
*/
static int db8500_regulator_switch_enable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n",
info->desc.name);
ret = enable_epod(info->epod_id, info->is_ramret);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"regulator-switch-%s-enable: prcmu call failed\n",
info->desc.name);
goto out;
}
info->is_enabled = true;
out:
return ret;
}
static int db8500_regulator_switch_disable(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
int ret;
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n",
info->desc.name);
ret = disable_epod(info->epod_id, info->is_ramret);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"regulator_switch-%s-disable: prcmu call failed\n",
info->desc.name);
goto out;
}
info->is_enabled = 0;
out:
return ret;
}
static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev)
{
struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL)
return -EINVAL;
dev_vdbg(rdev_get_dev(rdev),
"regulator-switch-%s-is_enabled (is_enabled): %i\n",
info->desc.name, info->is_enabled);
return info->is_enabled;
}
static struct regulator_ops db8500_regulator_switch_ops = {
.enable = db8500_regulator_switch_enable,
.disable = db8500_regulator_switch_disable,
.is_enabled = db8500_regulator_switch_is_enabled,
};
/*
* Regulator information
*/
static struct dbx500_regulator_info
dbx500_regulator_info[DB8500_NUM_REGULATORS] = {
[DB8500_REGULATOR_VAPE] = {
.desc = {
.name = "db8500-vape",
.id = DB8500_REGULATOR_VAPE,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VARM] = {
.desc = {
.name = "db8500-varm",
.id = DB8500_REGULATOR_VARM,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VMODEM] = {
.desc = {
.name = "db8500-vmodem",
.id = DB8500_REGULATOR_VMODEM,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VPLL] = {
.desc = {
.name = "db8500-vpll",
.id = DB8500_REGULATOR_VPLL,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VSMPS1] = {
.desc = {
.name = "db8500-vsmps1",
.id = DB8500_REGULATOR_VSMPS1,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VSMPS2] = {
.desc = {
.name = "db8500-vsmps2",
.id = DB8500_REGULATOR_VSMPS2,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.exclude_from_power_state = true,
},
[DB8500_REGULATOR_VSMPS3] = {
.desc = {
.name = "db8500-vsmps3",
.id = DB8500_REGULATOR_VSMPS3,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_VRF1] = {
.desc = {
.name = "db8500-vrf1",
.id = DB8500_REGULATOR_VRF1,
.ops = &db8500_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
},
[DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
.desc = {
.name = "db8500-sva-mmdsp",
.id = DB8500_REGULATOR_SWITCH_SVAMMDSP,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SVAMMDSP,
},
[DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
.desc = {
.name = "db8500-sva-mmdsp-ret",
.id = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SVAMMDSP,
.is_ramret = true,
},
[DB8500_REGULATOR_SWITCH_SVAPIPE] = {
.desc = {
.name = "db8500-sva-pipe",
.id = DB8500_REGULATOR_SWITCH_SVAPIPE,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SVAPIPE,
},
[DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
.desc = {
.name = "db8500-sia-mmdsp",
.id = DB8500_REGULATOR_SWITCH_SIAMMDSP,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SIAMMDSP,
},
[DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
.desc = {
.name = "db8500-sia-mmdsp-ret",
.id = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SIAMMDSP,
.is_ramret = true,
},
[DB8500_REGULATOR_SWITCH_SIAPIPE] = {
.desc = {
.name = "db8500-sia-pipe",
.id = DB8500_REGULATOR_SWITCH_SIAPIPE,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SIAPIPE,
},
[DB8500_REGULATOR_SWITCH_SGA] = {
.desc = {
.name = "db8500-sga",
.id = DB8500_REGULATOR_SWITCH_SGA,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_SGA,
},
[DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
.desc = {
.name = "db8500-b2r2-mcde",
.id = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_B2R2_MCDE,
},
[DB8500_REGULATOR_SWITCH_ESRAM12] = {
.desc = {
.name = "db8500-esram12",
.id = DB8500_REGULATOR_SWITCH_ESRAM12,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM12,
.is_enabled = true,
},
[DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
.desc = {
.name = "db8500-esram12-ret",
.id = DB8500_REGULATOR_SWITCH_ESRAM12RET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM12,
.is_ramret = true,
},
[DB8500_REGULATOR_SWITCH_ESRAM34] = {
.desc = {
.name = "db8500-esram34",
.id = DB8500_REGULATOR_SWITCH_ESRAM34,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM34,
.is_enabled = true,
},
[DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
.desc = {
.name = "db8500-esram34-ret",
.id = DB8500_REGULATOR_SWITCH_ESRAM34RET,
.ops = &db8500_regulator_switch_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
.epod_id = EPOD_ID_ESRAM34,
.is_ramret = true,
},
};
static int __devinit db8500_regulator_probe(struct platform_device *pdev)
{
struct regulator_init_data *db8500_init_data =
dev_get_platdata(&pdev->dev);
int i, err;
/* register all regulators */
for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
struct dbx500_regulator_info *info;
struct regulator_init_data *init_data = &db8500_init_data[i];
/* assign per-regulator data */
info = &dbx500_regulator_info[i];
info->dev = &pdev->dev;
/* register with the regulator framework */
info->rdev = regulator_register(&info->desc, &pdev->dev,
init_data, info, NULL);
if (IS_ERR(info->rdev)) {
err = PTR_ERR(info->rdev);
dev_err(&pdev->dev, "failed to register %s: err %i\n",
info->desc.name, err);
/* if failing, unregister all earlier regulators */
while (--i >= 0) {
info = &dbx500_regulator_info[i];
regulator_unregister(info->rdev);
}
return err;
}
dev_dbg(rdev_get_dev(info->rdev),
"regulator-%s-probed\n", info->desc.name);
}
err = ux500_regulator_debug_init(pdev,
dbx500_regulator_info,
ARRAY_SIZE(dbx500_regulator_info));
return err;
}
static int __exit db8500_regulator_remove(struct platform_device *pdev)
{
int i;
ux500_regulator_debug_exit();
for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
struct dbx500_regulator_info *info;
info = &dbx500_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");
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