[PATCH v3] Regulator: Add Anatop regulator driver

From: Ying-Chun Liu (PaulLiu)
Date: Tue Dec 27 2011 - 05:17:09 EST

From: "Ying-Chun Liu (PaulLiu)" <paul.liu@xxxxxxxxxx>

Anatop is an integrated regulator inside i.MX6 SoC.
There are 3 digital regulators which controls PU, CORE (ARM), and SOC.
And 3 analog regulators which controls 1P1, 2P5, 3P0 (USB).
This patch adds the Anatop regulator driver.

Signed-off-by: Nancy Chen <Nancy.Chen@xxxxxxxxxxxxx>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@xxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Cc: Liam Girdwood <lrg@xxxxxx>
---
drivers/regulator/Kconfig | 6 +
drivers/regulator/Makefile | 1 +
drivers/regulator/anatop-regulator.c | 214 ++++++++++++++++++++++++++++
include/linux/regulator/anatop-regulator.h | 63 ++++++++
4 files changed, 284 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/anatop-regulator.c
create mode 100644 include/linux/regulator/anatop-regulator.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 9713b1b..fc22b8d 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -327,5 +327,11 @@ config REGULATOR_AAT2870
If you have a AnalogicTech AAT2870 say Y to enable the
regulator driver.

+config REGULATOR_ANATOP
+ tristate "ANATOP LDO regulators"
+ depends on SOC_IMX6
+ help
+ Say y here to support ANATOP LDOs regulators.
+
endif

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 93a6318..990c332 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -46,5 +46,6 @@ obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
+obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o

ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
new file mode 100644
index 0000000..a925bcc
--- /dev/null
+++ b/drivers/regulator/anatop-regulator.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * 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.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/anatop-regulator.h>
+
+static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
+ int max_uV, unsigned *selector)
+{
+ struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
+ u32 val, rega, sel;
+ int uv;
+
+ uv = min_uV;
+ pr_debug("%s: uv %d, min %d, max %d\n", __func__,
+ uv, anatop_reg->rdata->min_voltage,
+ anatop_reg->rdata->max_voltage);
+
+ if (uv < anatop_reg->rdata->min_voltage
+ || uv > anatop_reg->rdata->max_voltage) {
+ if (max_uV > anatop_reg->rdata->min_voltage)
+ uv = anatop_reg->rdata->min_voltage;
+ else
+ return -EINVAL;
+ }
+
+ if (uv < reg->constraints->min_uV || uv > reg->constraints->max_uV)
+ return -EINVAL;
+
+ if (anatop_reg->rdata->control_reg) {
+ sel = (uv - anatop_reg->rdata->min_voltage) / 25000;
+ val = anatop_reg->rdata->min_bit_val + sel;
+ rega = (__raw_readl(anatop_reg->rdata->control_reg) &
+ ~(anatop_reg->rdata->vol_bit_mask <<
+ anatop_reg->rdata->vol_bit_shift));
+ *selector = sel;
+ pr_debug("%s: calculated val %d\n", __func__, val);
+ __raw_writel((val << anatop_reg->rdata->vol_bit_shift) | rega,
+ anatop_reg->rdata->control_reg);
+ return 0;
+ } else {
+ return -ENOTSUPP;
+ }
+}
+
+static int anatop_get_voltage_sel(struct regulator_dev *reg)
+{
+ struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
+ int selector;
+ struct anatop_regulator_data *rdata = anatop_reg->rdata;
+
+ if (rdata->control_reg) {
+ u32 val = (__raw_readl(rdata->control_reg) <<
+ rdata->vol_bit_shift) & rdata->vol_bit_mask;
+ selector = val - rdata->min_bit_val;
+ return selector;
+ } else {
+ return -ENOTSUPP;
+ }
+}
+
+static int anatop_list_voltage(struct regulator_dev *dev, unsigned selector)
+{
+ struct anatop_regulator *anatop_reg = rdev_get_drvdata(dev);
+ int uv;
+ struct anatop_regulator_data *rdata = anatop_reg->rdata;
+
+ uv = rdata->min_voltage
+ + selector * 25000;
+ pr_debug("vddio = %d, selector = %u\n", uv, selector);
+ return uv;
+}
+
+static struct regulator_ops anatop_rops = {
+ .set_voltage = anatop_set_voltage,
+ .get_voltage_sel = anatop_get_voltage_sel,
+ .list_voltage = anatop_list_voltage,
+};
+
+static struct regulator_desc anatop_reg_desc[] = {
+ {
+ .name = "vddpu",
+ .id = ANATOP_VDDPU,
+ .ops = &anatop_rops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE
+ },
+ {
+ .name = "vddcore",
+ .id = ANATOP_VDDCORE,
+ .ops = &anatop_rops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE
+ },
+ {
+ .name = "vddsoc",
+ .id = ANATOP_VDDSOC,
+ .ops = &anatop_rops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE
+ },
+ {
+ .name = "vdd2p5",
+ .id = ANATOP_VDD2P5,
+ .ops = &anatop_rops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE
+ },
+ {
+ .name = "vdd1p1",
+ .id = ANATOP_VDD1P1,
+ .ops = &anatop_rops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE
+ },
+ {
+ .name = "vdd3p0",
+ .id = ANATOP_VDD3P0,
+ .ops = &anatop_rops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE
+ },
+};
+
+int anatop_regulator_probe(struct platform_device *pdev)
+{
+ struct regulator_desc *rdesc;
+ struct regulator_dev *rdev;
+ struct anatop_regulator *sreg;
+ struct regulator_init_data *initdata;
+
+ initdata = pdev->dev.platform_data;
+ sreg = initdata->driver_data;
+
+ spin_lock_init(&sreg->lock);
+
+ if (pdev->id > ANATOP_SUPPLY_NUM) {
+ dev_err(&pdev->dev, "failed to register regulator id %d\n",
+ pdev->id);
+ return -EINVAL;
+ } else {
+ rdesc = &anatop_reg_desc[pdev->id];
+ }
+
+ /* register regulator */
+ rdev = regulator_register(rdesc, &pdev->dev,
+ pdev->dev.platform_data, sreg);
+ platform_set_drvdata(pdev, rdev);
+
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "failed to register %s\n",
+ rdesc->name);
+ return PTR_ERR(rdev);
+ }
+
+ return 0;
+}
+
+int anatop_regulator_remove(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev = platform_get_drvdata(pdev);
+ regulator_unregister(rdev);
+ return 0;
+}
+
+struct platform_driver anatop_reg = {
+ .driver = {
+ .name = "anatop_reg",
+ },
+ .probe = anatop_regulator_probe,
+ .remove = anatop_regulator_remove,
+};
+
+int anatop_regulator_init(void)
+{
+ return platform_driver_register(&anatop_reg);
+}
+
+void anatop_regulator_exit(void)
+{
+ platform_driver_unregister(&anatop_reg);
+}
+
+postcore_initcall(anatop_regulator_init);
+module_exit(anatop_regulator_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("ANATOP Regulator driver");
+MODULE_LICENSE("GPL");
+
diff --git a/include/linux/regulator/anatop-regulator.h b/include/linux/regulator/anatop-regulator.h
new file mode 100644
index 0000000..b29b009
--- /dev/null
+++ b/include/linux/regulator/anatop-regulator.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * 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.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef __ANATOP_REGULATOR_H
+#define __ANATOP_REGULATOR_H
+#include <linux/regulator/driver.h>
+
+/* regulator supplies for Anatop */
+enum anatop_regulator_supplies {
+ ANATOP_VDDPU,
+ ANATOP_VDDCORE,
+ ANATOP_VDDSOC,
+ ANATOP_VDD2P5,
+ ANATOP_VDD1P1,
+ ANATOP_VDD3P0,
+ ANATOP_SUPPLY_NUM
+};
+
+struct anatop_regulator {
+ struct regulator_desc regulator;
+ struct anatop_regulator *parent;
+ struct anatop_regulator_data *rdata;
+ struct completion done;
+
+ spinlock_t lock;
+ struct notifier_block nb;
+
+};
+
+
+struct anatop_regulator_data {
+ const char *name;
+
+ u32 control_reg;
+ int vol_bit_shift;
+ int vol_bit_mask;
+ int min_bit_val;
+ int min_voltage;
+ int max_voltage;
+};
+
+int anatop_register_regulator(
+ struct anatop_regulator *reg_data, int reg,
+ struct regulator_init_data *initdata);
+
+#endif /* __ANATOP_REGULATOR_H */
--
1.7.7.3

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