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Message-ID: <1313137841-31349-1-git-send-email-linus.walleij@stericsson.com>
Date: Fri, 12 Aug 2011 10:30:41 +0200
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Samuel Ortiz <sameo@...ux.intel.com>,
<linux-kernel@...r.kernel.org>
Cc: Lee Jones <lee.jones@...aro.org>,
Philippe Langlais <philippe.langlais@...ricsson.com>,
Liam Girdwood <lrg@...com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Vijaya Kumar Kilari <vijay.kilari@...ricsson.com>,
Shreshtha Kumar Sahu <shreshthakumar.sahu@...ricsson.com>,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 23/23] regulator/db5500-prcmu: add driver
From: Philippe Langlais <philippe.langlais@...ricsson.com>
This adds a driver for the DB5500 PRCMU voltage domain
regulators, in the same spirit as the DB8500 PRCMU VD
regulators.
Cc: Liam Girdwood <lrg@...com>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Vijaya Kumar Kilari <vijay.kilari@...ricsson.com>
Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@...ricsson.com>
Signed-off-by: Philippe Langlais <philippe.langlais@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
arch/arm/mach-ux500/Kconfig | 1 +
drivers/regulator/db5500-prcmu.c | 351 ++++++++++++++++++++++++++++++++
include/linux/regulator/db5500-prcmu.h | 25 +++
3 files changed, 377 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/db5500-prcmu.c
create mode 100644 include/linux/regulator/db5500-prcmu.h
diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig
index 4210cb4..86188b2 100644
--- a/arch/arm/mach-ux500/Kconfig
+++ b/arch/arm/mach-ux500/Kconfig
@@ -12,6 +12,7 @@ menu "Ux500 SoC"
config UX500_SOC_DB5500
bool "DB5500"
select MFD_DB5500_PRCMU
+ select REGULATOR_DB5500_PRCMU
config UX500_SOC_DB8500
bool "DB8500"
diff --git a/drivers/regulator/db5500-prcmu.c b/drivers/regulator/db5500-prcmu.c
new file mode 100644
index 0000000..4da49c1
--- /dev/null
+++ b/drivers/regulator/db5500-prcmu.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * License Terms: GNU General Public License v2
+ * Authors: Sundar Iyer <sundar.iyer@...ricsson.com> for ST-Ericsson
+ * Bengt Jonsson <bengt.g.jonsson@...ricsson.com> for ST-Ericsson
+ *
+ * Power domain regulators on DB5500
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/db5500-prcmu.h>
+#include <linux/mfd/dbx500-prcmu.h>
+#include "dbx500-prcmu.h"
+
+/**
+ * struct db5500_regulator_info - db5500 regulator information
+ * @dev: device pointer
+ * @desc: regulator description
+ * @rdev: regulator device pointer
+ * @is_enabled: status of the regulator
+ * @epod_id: id for EPOD (power domain)
+ * @is_ramret: RAM retention switch for EPOD (power domain)
+ * @operating_point: operating point (only for vape, to be removed)
+ *
+ */
+struct db5500_regulator_info {
+ struct device *dev;
+ struct regulator_desc desc;
+ struct regulator_dev *rdev;
+ bool is_enabled;
+ u16 epod_id;
+ bool is_ramret;
+ bool exclude_from_power_state;
+ unsigned int operating_point;
+};
+
+static int db5500_regulator_enable(struct regulator_dev *rdev)
+{
+ struct db5500_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);
+
+ info->is_enabled = true;
+ if (!info->exclude_from_power_state)
+ power_state_active_enable();
+
+ return 0;
+}
+
+static int db5500_regulator_disable(struct regulator_dev *rdev)
+{
+ struct db5500_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);
+
+ info->is_enabled = false;
+ if (!info->exclude_from_power_state)
+ ret = power_state_active_disable();
+
+ return ret;
+}
+
+static int db5500_regulator_is_enabled(struct regulator_dev *rdev)
+{
+ struct db5500_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;
+}
+
+/* db5500 regulator operations */
+static struct regulator_ops db5500_regulator_ops = {
+ .enable = db5500_regulator_enable,
+ .disable = db5500_regulator_disable,
+ .is_enabled = db5500_regulator_is_enabled,
+};
+
+/*
+ * EPOD control
+ */
+static bool epod_on[NUM_EPOD_ID];
+static bool epod_ramret[NUM_EPOD_ID];
+
+static inline int epod_id_to_index(u16 epod_id)
+{
+ return epod_id - DB5500_EPOD_ID_BASE;
+}
+
+static int enable_epod(u16 epod_id, bool ramret)
+{
+ int idx = epod_id_to_index(epod_id);
+ int ret;
+
+ if (ramret) {
+ if (!epod_on[idx]) {
+ ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
+ if (ret < 0)
+ return ret;
+ }
+ epod_ramret[idx] = true;
+ } else {
+ ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
+ if (ret < 0)
+ return ret;
+ epod_on[idx] = true;
+ }
+
+ return 0;
+}
+
+static int disable_epod(u16 epod_id, bool ramret)
+{
+ int idx = epod_id_to_index(epod_id);
+ int ret;
+
+ if (ramret) {
+ if (!epod_on[idx]) {
+ ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
+ if (ret < 0)
+ return ret;
+ }
+ epod_ramret[idx] = false;
+ } else {
+ if (epod_ramret[idx]) {
+ 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[idx] = false;
+ }
+
+ return 0;
+}
+
+/*
+ * Regulator switch
+ */
+static int db5500_regulator_switch_enable(struct regulator_dev *rdev)
+{
+ struct db5500_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 db5500_regulator_switch_disable(struct regulator_dev *rdev)
+{
+ struct db5500_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 db5500_regulator_switch_is_enabled(struct regulator_dev *rdev)
+{
+ struct db5500_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 db5500_regulator_switch_ops = {
+ .enable = db5500_regulator_switch_enable,
+ .disable = db5500_regulator_switch_disable,
+ .is_enabled = db5500_regulator_switch_is_enabled,
+};
+
+/*
+ * Regulator information
+ */
+#define DB5500_REGULATOR_SWITCH(_name, reg) \
+ [DB5500_REGULATOR_SWITCH_##reg] = { \
+ .desc = { \
+ .name = _name, \
+ .id = DB5500_REGULATOR_SWITCH_##reg, \
+ .ops = &db5500_regulator_switch_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }, \
+ .epod_id = DB5500_EPOD_ID_##reg, \
+}
+
+static struct db5500_regulator_info
+ db5500_regulator_info[DB5500_NUM_REGULATORS] = {
+ [DB5500_REGULATOR_VAPE] = {
+ .desc = {
+ .name = "db5500-vape",
+ .id = DB5500_REGULATOR_VAPE,
+ .ops = &db5500_regulator_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+ },
+ DB5500_REGULATOR_SWITCH("db5500-sga", SGA),
+ DB5500_REGULATOR_SWITCH("db5500-hva", HVA),
+ DB5500_REGULATOR_SWITCH("db5500-sia", SIA),
+ DB5500_REGULATOR_SWITCH("db5500-disp", DISP),
+ DB5500_REGULATOR_SWITCH("db5500-esram12", ESRAM12),
+};
+
+static int __devinit db5500_regulator_probe(struct platform_device *pdev)
+{
+ struct regulator_init_data *db5500_init_data =
+ dev_get_platdata(&pdev->dev);
+ int i, err;
+
+ /* register all regulators */
+ for (i = 0; i < ARRAY_SIZE(db5500_regulator_info); i++) {
+ struct db5500_regulator_info *info;
+ struct regulator_init_data *init_data = &db5500_init_data[i];
+
+ /* assign per-regulator data */
+ info = &db5500_regulator_info[i];
+ info->dev = &pdev->dev;
+
+ /* register with the regulator framework */
+ info->rdev = regulator_register(&info->desc, &pdev->dev,
+ init_data, info);
+ 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 */
+ i--;
+ while (i >= 0) {
+ info = &db5500_regulator_info[i];
+ regulator_unregister(info->rdev);
+ i--;
+ }
+ return err;
+ }
+
+ dev_dbg(rdev_get_dev(info->rdev),
+ "regulator-%s-probed\n", info->desc.name);
+ }
+
+ return 0;
+}
+
+static int __exit db5500_regulator_remove(struct platform_device *pdev)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(db5500_regulator_info); i++) {
+ struct db5500_regulator_info *info;
+ info = &db5500_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 db5500_regulator_driver = {
+ .driver = {
+ .name = "db5500-prcmu-regulators",
+ .owner = THIS_MODULE,
+ },
+ .probe = db5500_regulator_probe,
+ .remove = __exit_p(db5500_regulator_remove),
+};
+
+static int __init db5500_regulator_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&db5500_regulator_driver);
+ if (ret < 0)
+ return -ENODEV;
+
+ return 0;
+}
+
+static void __exit db5500_regulator_exit(void)
+{
+ platform_driver_unregister(&db5500_regulator_driver);
+}
+
+arch_initcall(db5500_regulator_init);
+module_exit(db5500_regulator_exit);
+
+MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
+MODULE_DESCRIPTION("DB5500 regulator driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/regulator/db5500-prcmu.h b/include/linux/regulator/db5500-prcmu.h
new file mode 100644
index 0000000..c5701e4
--- /dev/null
+++ b/include/linux/regulator/db5500-prcmu.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Author: Bengt Jonsson <bengt.g.jonsson@...ricsson.com> for ST-Ericsson
+ *
+ * Interface to power domain regulators on DB5500
+ */
+
+#ifndef __DB5500_REGULATOR_H__
+#define __DB5500_REGULATOR_H__
+
+/* Number of DB5500 regulators and regulator enumeration */
+enum db5500_regulator_id {
+ DB5500_REGULATOR_VAPE,
+ DB5500_REGULATOR_SWITCH_SGA,
+ DB5500_REGULATOR_SWITCH_HVA,
+ DB5500_REGULATOR_SWITCH_SIA,
+ DB5500_REGULATOR_SWITCH_DISP,
+ DB5500_REGULATOR_SWITCH_ESRAM12,
+ DB5500_NUM_REGULATORS
+};
+
+#endif
--
1.7.3.2
--
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