[PATCHv3 3/6] regulator: omap smps regulator driver

Tero Kristo
2011-07-18T17:36:07Z

OMAP SMPS regulator driver provides access to OMAP voltage processor
controlled regulators. These include VDD_MPU and VDD_CORE for OMAP3 and
additionally VDD_IVA for OMAP4. SMPS regulators use the OMAP voltage
layer for the actual voltage regulation operations.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Todd Poynor <toddpoynor@google.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@ti.com>
---
drivers/regulator/Kconfig | 9 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/omap-smps-regulator.c | 180 +++++++++++++++++++++++++++++++
include/linux/regulator/omap-smps.h | 20 ++++
4 files changed, 210 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/omap-smps-regulator.c
create mode 100644 include/linux/regulator/omap-smps.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index d7ed20f..bb18ff2 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -303,5 +303,14 @@ config REGULATOR_TPS65910
help
This driver supports TPS65910 voltage regulator chips.

+config REGULATOR_OMAP_SMPS
+ tristate "TI OMAP SMPS Power Regulators"
+ depends on (ARCH_OMAP3 || ARCH_OMAP4) && PM && TWL4030_CORE
+ help
+ This driver supports the OMAP3 / OMAP4 SMPS regulators for VDD1,
+ VDD2 and VDD3. These regulators reside inside the TWL4030 /
+ TWL6030 chip but are accessed using the voltage processor
+ interface of OMAP.
+
endif

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 3932d2e..191e3d5 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -43,5 +43,6 @@ obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
+obj-$(CONFIG_REGULATOR_OMAP_SMPS) += omap-smps-regulator.o

ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/omap-smps-regulator.c b/drivers/regulator/omap-smps-regulator.c
new file mode 100644
index 0000000..8b56e4f
--- /dev/null
+++ b/drivers/regulator/omap-smps-regulator.c
@@ -0,0 +1,179 @@
+/*
+ * omap-vp-regulator.c -- support SMPS regulators for OMAP chips
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/omap-smps.h>
+#include <plat/voltage.h>
+
+#define DRIVER_NAME "omap-smps"
+
+struct omap_smps_reg_info {
+ const char *vdd_name;
+ struct regulator_dev *rdev;
+ struct voltagedomain *voltdm;
+ struct regulator_desc desc;
+};
+
+static int omap_smps_set_voltage(struct regulator_dev *rdev, int min_uV,
+ int max_uV, unsigned *selector)
+{
+ struct omap_smps_reg_info *info = rdev_get_drvdata(rdev);
+ return voltdm_scale(info->voltdm, min_uV);
+}
+
+static int omap_smps_get_voltage(struct regulator_dev *rdev)
+{
+ struct omap_smps_reg_info *info = rdev_get_drvdata(rdev);
+ return omap_vp_get_curr_volt(info->voltdm);
+}
+
+static struct regulator_ops omap_smps_ops = {
+ .set_voltage = omap_smps_set_voltage,
+ .get_voltage = omap_smps_get_voltage,
+};
+
+#define SMPS_REG(name) { \
+ .vdd_name = #name, \
+ .desc = { \
+ .ops = &omap_smps_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }, \
+ }
+
+static struct omap_smps_reg_info omap_smps_regs[] = {
+ SMPS_REG(mpu),
+ SMPS_REG(mpu_iva),
+ SMPS_REG(iva),
+ SMPS_REG(core),
+};
+
+static void omap_smps_reg_cleanup(void)
+{
+ int i;
+ struct omap_smps_reg_info *info;
+
+ for (i = 0; i < ARRAY_SIZE(omap_smps_regs); i++) {
+ info = &omap_smps_regs[i];
+ if (info->rdev) {
+ regulator_unregister(info->rdev);
+ info->rdev = NULL;
+ }
+
+ kfree(info->desc.name);
+ info->desc.name = NULL;
+ }
+}
+
+static struct regulator_init_data dummy_initdata __initdata;
+
+static int __devinit omap_smps_reg_probe(struct platform_device *pdev)
+{
+ int i, j, ret;
+ struct omap_smps_reg_info *info;
+ struct omap_smps_platform_data *pdata;
+ struct regulator_dev *rdev;
+ struct regulator_init_data *initdata;
+ struct voltagedomain *voltdm;
+ char *name;
+
+ pdata = pdev->dev.platform_data;
+
+ for (i = 0; i < ARRAY_SIZE(omap_smps_regs); i++) {
+ initdata = &dummy_initdata;
+ info = &omap_smps_regs[i];
+
+ for (j = 0; j < pdata->num_regulators; j++)
+ if (!strcmp(info->vdd_name,
+ pdata->regulators[j]->consumer_supplies[0].
+ dev_name)) {
+ initdata = pdata->regulators[j];
+ break;
+ }
+
+ voltdm = voltdm_lookup(info->vdd_name);
+
+ if (!voltdm)
+ continue;
+
+ info->voltdm = voltdm;
+
+ name = kmalloc(strlen(info->vdd_name) + 5, GFP_KERNEL);
+
+ if (!name) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ sprintf(name, "VDD_%s", info->vdd_name);
+
+ for (j = 0; j < strlen(name); j++)
+ name[j] = toupper(name[j]);
+
+ info->desc.name = name;
+
+ rdev = regulator_register(&info->desc, &pdev->dev, initdata,
+ info);
+
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "can't register %s, %ld\n",
+ info->desc.name, PTR_ERR(rdev));
+ ret = PTR_ERR(rdev);
+ goto err;
+ }
+
+ info->rdev = rdev;
+ }
+
+ return 0;
+err:
+ omap_smps_reg_cleanup();
+ return ret;
+}
+
+static int omap_smps_reg_remove(struct platform_device *pdev)
+{
+ omap_smps_reg_cleanup();
+ return 0;
+}
+
+static struct platform_driver omap_smps_reg_driver = {
+ .probe = omap_smps_reg_probe,
+ .remove = __devexit_p(omap_smps_reg_remove),
+ .driver.name = DRIVER_NAME,
+ .driver.owner = THIS_MODULE,
+};
+
+static int __init omap_smps_reg_init(void)
+{
+ return platform_driver_register(&omap_smps_reg_driver);
+}
+subsys_initcall(omap_smps_reg_init);
+
+static void __exit omap_smps_reg_exit(void)
+{
+ platform_driver_unregister(&omap_smps_reg_driver);
+}
+module_exit(omap_smps_reg_exit);
+
+MODULE_ALIAS("platform:"DRIVER_NAME);
+MODULE_AUTHOR("Tero Kristo <t-kristo@ti.com>");
+MODULE_DESCRIPTION("OMAP SMPS regulator driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/omap-smps.h b/include/linux/regulator/omap-smps.h
new file mode 100644
index 0000000..1d5f940
--- /dev/null
+++ b/include/linux/regulator/omap-smps.h
@@ -0,0 +1,20 @@
+/*
+ * omap-smps.h - header for OMAP SMPS regulator support
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __OMAP_SMPS_H__
+#define __OMAP_SMPS_H__
+
+struct omap_smps_platform_data {
+ struct regulator_init_data **regulators;
+ int num_regulators;
+};
+
+#endif /* End of __OMAP_SMPS_H__ */
--
1.7.4.1