[PATCH v4 3/3] regulator: qcom-rpm: Regulator driver for the Qualcomm RPM

Bjorn Andersson
2014-07-15T23:00:41Z

Driver for regulators exposed by the Resource Power Manager (RPM) found
in Qualcomm 8660, 8960 and 8064 based devices.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
---
drivers/regulator/Kconfig | 12 +
drivers/regulator/Makefile | 1 +
drivers/regulator/qcom_rpm-regulator.c | 787 +++++++++++++++++++++++++++++++++
3 files changed, 800 insertions(+)
create mode 100644 drivers/regulator/qcom_rpm-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 789eb46..cacce41 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -439,6 +439,18 @@ config REGULATOR_PFUZE100
Say y here to support the regulators found on the Freescale
PFUZE100/PFUZE200 PMIC.

+config REGULATOR_QCOM_RPM
+ tristate "Qualcomm RPM regulator driver"
+ depends on QCOM_RPM
+ help
+ If you say yes to this option, support will be included for the
+ regulators exposed by the Resource Power Manager found in Qualcomm
+ 8660, 8960 and 8064 based devices.
+
+ Say M here if you want to include support for the regulators on the
+ Qualcomm RPM as a module. The module will be named
+ "qcom_rpm-regulator".
+
config REGULATOR_RC5T583
tristate "RICOH RC5T583 Power regulators"
depends on MFD_RC5T583
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index d461110..6f57597 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o
+obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
obj-$(CONFIG_REGULATOR_TPS51632) += tps51632-regulator.o
diff --git a/drivers/regulator/qcom_rpm-regulator.c b/drivers/regulator/qcom_rpm-regulator.c
new file mode 100644
index 0000000..f28ccdb
--- /dev/null
+++ b/drivers/regulator/qcom_rpm-regulator.c
@@ -0,0 +1,787 @@
+/*
+ * Copyright (c) 2014, Sony Mobile Communications AB.
+ * Copyright (c) 2012-2013, The Linux Foundation. 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 version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/soc/qcom_rpm.h>
+
+#define MAX_REQUEST_LEN 2
+
+struct request_member {
+ int word;
+ unsigned int mask;
+ int shift;
+};
+
+struct rpm_reg_parts {
+ struct request_member mV; /* used if voltage is in mV */
+ struct request_member uV; /* used if voltage is in uV */
+ struct request_member ip; /* peak current in mA */
+ struct request_member pd; /* pull down enable */
+ struct request_member ia; /* average current in mA */
+ struct request_member fm; /* force mode */
+ struct request_member pm; /* power mode */
+ struct request_member pc; /* pin control */
+ struct request_member pf; /* pin function */
+ struct request_member enable_state; /* NCP and switch */
+ struct request_member comp_mode; /* NCP */
+ struct request_member freq; /* frequency: NCP and SMPS */
+ struct request_member freq_clk_src; /* clock source: SMPS */
+ struct request_member hpm; /* switch: control OCP and SS */
+ int request_len;
+};
+
+#define FORCE_MODE_IS_2_BITS(reg) \
+ ((vreg->parts->fm.mask >> vreg->parts->fm.shift) == 3)
+#define FORCE_MODE_IS_3_BITS(reg) \
+ ((vreg->parts->fm.mask >> vreg->parts->fm.shift) == 7)
+
+struct qcom_rpm_reg {
+ struct qcom_rpm *rpm;
+
+ struct mutex lock;
+ struct device *dev;
+ struct regulator_desc desc;
+ const struct rpm_reg_parts *parts;
+
+ int resource;
+ u32 val[MAX_REQUEST_LEN];
+
+ int uV;
+ int is_enabled;
+};
+
+static const struct rpm_reg_parts rpm8660_ldo_parts = {
+ .request_len = 2,
+ .mV = { 0, 0x00000FFF, 0 },
+ .ip = { 0, 0x00FFF000, 12 },
+ .fm = { 0, 0x03000000, 24 },
+ .pc = { 0, 0x3C000000, 26 },
+ .pf = { 0, 0xC0000000, 30 },
+ .pd = { 1, 0x00000001, 0 },
+ .ia = { 1, 0x00001FFE, 1 },
+};
+
+static const struct rpm_reg_parts rpm8660_smps_parts = {
+ .request_len = 2,
+ .mV = { 0, 0x00000FFF, 0 },
+ .ip = { 0, 0x00FFF000, 12 },
+ .fm = { 0, 0x03000000, 24 },
+ .pc = { 0, 0x3C000000, 26 },
+ .pf = { 0, 0xC0000000, 30 },
+ .pd = { 1, 0x00000001, 0 },
+ .ia = { 1, 0x00001FFE, 1 },
+ .freq = { 1, 0x001FE000, 13 },
+ .freq_clk_src = { 1, 0x00600000, 21 },
+};
+
+static const struct rpm_reg_parts rpm8660_switch_parts = {
+ .request_len = 1,
+ .enable_state = { 0, 0x00000001, 0 },
+ .pd = { 0, 0x00000002, 1 },
+ .pc = { 0, 0x0000003C, 2 },
+ .pf = { 0, 0x000000C0, 6 },
+ .hpm = { 0, 0x00000300, 8 },
+};
+
+static const struct rpm_reg_parts rpm8660_ncp_parts = {
+ .request_len = 1,
+ .mV = { 0, 0x00000FFF, 0 },
+ .enable_state = { 0, 0x00001000, 12 },
+ .comp_mode = { 0, 0x00002000, 13 },
+ .freq = { 0, 0x003FC000, 14 },
+};
+
+static const struct rpm_reg_parts rpm8960_ldo_parts = {
+ .request_len = 2,
+ .uV = { 0, 0x007FFFFF, 0 },
+ .pd = { 0, 0x00800000, 23 },
+ .pc = { 0, 0x0F000000, 24 },
+ .pf = { 0, 0xF0000000, 28 },
+ .ip = { 1, 0x000003FF, 0 },
+ .ia = { 1, 0x000FFC00, 10 },
+ .fm = { 1, 0x00700000, 20 },
+};
+
+static const struct rpm_reg_parts rpm8960_smps_parts = {
+ .request_len = 2,
+ .uV = { 0, 0x007FFFFF, 0 },
+ .pd = { 0, 0x00800000, 23 },
+ .pc = { 0, 0x0F000000, 24 },
+ .pf = { 0, 0xF0000000, 28 },
+ .ip = { 1, 0x000003FF, 0 },
+ .ia = { 1, 0x000FFC00, 10 },
+ .fm = { 1, 0x00700000, 20 },
+ .pm = { 1, 0x00800000, 23 },
+ .freq = { 1, 0x1F000000, 24 },
+ .freq_clk_src = { 1, 0x60000000, 29 },
+};
+
+static const struct rpm_reg_parts rpm8960_switch_parts = {
+ .request_len = 1,
+ .enable_state = { 0, 0x00000001, 0 },
+ .pd = { 0, 0x00000002, 1 },
+ .pc = { 0, 0x0000003C, 2 },
+ .pf = { 0, 0x000003C0, 6 },
+ .hpm = { 0, 0x00000C00, 10 },
+};
+
+static const struct rpm_reg_parts rpm8960_ncp_parts = {
+ .request_len = 1,
+ .uV = { 0, 0x007FFFFF, 0 },
+ .enable_state = { 0, 0x00800000, 23 },
+ .comp_mode = { 0, 0x01000000, 24 },
+ .freq = { 0, 0x3E000000, 25 },
+};
+
+/*
+ * Physically available PMIC regulator voltage ranges
+ */
+static const struct regulator_linear_range pldo_ranges[] = {
+ REGULATOR_LINEAR_RANGE( 750000, 0, 59, 12500),
+ REGULATOR_LINEAR_RANGE(1500000, 60, 123, 25000),
+ REGULATOR_LINEAR_RANGE(3100000, 124, 160, 50000),
+};
+
+static const struct regulator_linear_range nldo_ranges[] = {
+ REGULATOR_LINEAR_RANGE( 750000, 0, 63, 12500),
+};
+
+static const struct regulator_linear_range nldo1200_ranges[] = {
+ REGULATOR_LINEAR_RANGE( 375000, 0, 59, 6250),
+ REGULATOR_LINEAR_RANGE( 750000, 60, 123, 12500),
+};
+
+static const struct regulator_linear_range smps_ranges[] = {
+ REGULATOR_LINEAR_RANGE( 375000, 0, 29, 12500),
+ REGULATOR_LINEAR_RANGE( 750000, 30, 89, 12500),
+ REGULATOR_LINEAR_RANGE(1500000, 90, 153, 25000),
+};
+
+static const struct regulator_linear_range ftsmps_ranges[] = {
+ REGULATOR_LINEAR_RANGE( 350000, 0, 6, 50000),
+ REGULATOR_LINEAR_RANGE( 700000, 7, 63, 12500),
+ REGULATOR_LINEAR_RANGE(1500000, 64, 100, 50000),
+};
+
+static const struct regulator_linear_range ncp_ranges[] = {
+ REGULATOR_LINEAR_RANGE(1500000, 0, 31, 50000),
+};
+
+static int rpm_reg_write(struct qcom_rpm_reg *vreg,
+ const struct request_member *req,
+ const int value)
+{
+ if (WARN_ON((value << req->shift) & ~req->mask))
+ return -EINVAL;
+
+ vreg->val[req->word] &= ~req->mask;
+ vreg->val[req->word] |= value << req->shift;
+
+ return qcom_rpm_write(vreg->rpm,
+ vreg->resource,
+ vreg->val,
+ vreg->parts->request_len);
+}
+
+static int rpm_reg_set_mV_sel(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->mV;
+ int ret = 0;
+ int uV;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ uV = regulator_list_voltage_linear_range(rdev, selector);
+ if (uV < 0)
+ return uV;
+
+ mutex_lock(&vreg->lock);
+ vreg->uV = uV;
+ if (vreg->is_enabled)
+ ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_set_uV_sel(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->uV;
+ int ret = 0;
+ int uV;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ uV = regulator_list_voltage_linear_range(rdev, selector);
+ if (uV < 0)
+ return uV;
+
+ mutex_lock(&vreg->lock);
+ vreg->uV = uV;
+ if (vreg->is_enabled)
+ ret = rpm_reg_write(vreg, req, vreg->uV);
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_get_voltage(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+
+ return vreg->uV;
+}
+
+static int rpm_reg_mV_enable(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->mV;
+ int ret;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ mutex_lock(&vreg->lock);
+ ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
+ if (!ret)
+ vreg->is_enabled = 1;
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_uV_enable(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->uV;
+ int ret;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ mutex_lock(&vreg->lock);
+ ret = rpm_reg_write(vreg, req, vreg->uV);
+ if (!ret)
+ vreg->is_enabled = 1;
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_switch_enable(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->enable_state;
+ int ret;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ mutex_lock(&vreg->lock);
+ ret = rpm_reg_write(vreg, req, 1);
+ if (!ret)
+ vreg->is_enabled = 1;
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_mV_disable(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->mV;
+ int ret;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ mutex_lock(&vreg->lock);
+ ret = rpm_reg_write(vreg, req, 0);
+ if (!ret)
+ vreg->is_enabled = 0;
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_uV_disable(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->uV;
+ int ret;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ mutex_lock(&vreg->lock);
+ ret = rpm_reg_write(vreg, req, 0);
+ if (!ret)
+ vreg->is_enabled = 0;
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_switch_disable(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+ const struct rpm_reg_parts *parts = vreg->parts;
+ const struct request_member *req = &parts->enable_state;
+ int ret;
+
+ if (req->mask == 0)
+ return -EINVAL;
+
+ mutex_lock(&vreg->lock);
+ ret = rpm_reg_write(vreg, req, 0);
+ if (!ret)
+ vreg->is_enabled = 0;
+ mutex_unlock(&vreg->lock);
+
+ return ret;
+}
+
+static int rpm_reg_is_enabled(struct regulator_dev *rdev)
+{
+ struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
+
+ return vreg->is_enabled;
+}
+
+static struct regulator_ops uV_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+
+ .set_voltage_sel = rpm_reg_set_uV_sel,
+ .get_voltage = rpm_reg_get_voltage,
+
+ .enable = rpm_reg_uV_enable,
+ .disable = rpm_reg_uV_disable,
+ .is_enabled = rpm_reg_is_enabled,
+};
+
+static struct regulator_ops mV_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+
+ .set_voltage_sel = rpm_reg_set_mV_sel,
+ .get_voltage = rpm_reg_get_voltage,
+
+ .enable = rpm_reg_mV_enable,
+ .disable = rpm_reg_mV_disable,
+ .is_enabled = rpm_reg_is_enabled,
+};
+
+static struct regulator_ops switch_ops = {
+ .enable = rpm_reg_switch_enable,
+ .disable = rpm_reg_switch_disable,
+ .is_enabled = rpm_reg_is_enabled,
+};
+
+/*
+ * PM8058 regulators
+ */
+static const struct qcom_rpm_reg pm8058_pldo = {
+ .desc.linear_ranges = pldo_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
+ .desc.n_voltages = 161,
+ .desc.ops = &mV_ops,
+ .parts = &rpm8660_ldo_parts,
+};
+
+static const struct qcom_rpm_reg pm8058_nldo = {
+ .desc.linear_ranges = nldo_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
+ .desc.n_voltages = 64,
+ .desc.ops = &mV_ops,
+ .parts = &rpm8660_ldo_parts,
+};
+
+static const struct qcom_rpm_reg pm8058_smps = {
+ .desc.linear_ranges = smps_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
+ .desc.n_voltages = 154,
+ .desc.ops = &mV_ops,
+ .parts = &rpm8660_smps_parts,
+};
+
+static const struct qcom_rpm_reg pm8058_ncp = {
+ .desc.linear_ranges = ncp_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
+ .desc.n_voltages = 32,
+ .desc.ops = &mV_ops,
+ .parts = &rpm8660_ncp_parts,
+};
+
+static const struct qcom_rpm_reg pm8058_switch = {
+ .desc.ops = &switch_ops,
+ .parts = &rpm8660_switch_parts,
+};
+
+/*
+ * PM8901 regulators
+ */
+static const struct qcom_rpm_reg pm8901_pldo = {
+ .desc.linear_ranges = pldo_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
+ .desc.n_voltages = 161,
+ .desc.ops = &mV_ops,
+ .parts = &rpm8660_ldo_parts,
+};
+
+static const struct qcom_rpm_reg pm8901_nldo = {
+ .desc.linear_ranges = nldo_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
+ .desc.n_voltages = 64,
+ .desc.ops = &mV_ops,
+ .parts = &rpm8660_ldo_parts,
+};
+
+static const struct qcom_rpm_reg pm8901_ftsmps = {
+ .desc.linear_ranges = ftsmps_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
+ .desc.n_voltages = 101,
+ .desc.ops = &mV_ops,
+ .parts = &rpm8660_smps_parts,
+};
+
+static const struct qcom_rpm_reg pm8901_switch = {
+ .desc.ops = &switch_ops,
+ .parts = &rpm8660_switch_parts,
+};
+
+/*
+ * PM8921 regulators
+ */
+static const struct qcom_rpm_reg pm8921_pldo = {
+ .desc.linear_ranges = pldo_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
+ .desc.n_voltages = 161,
+ .desc.ops = &uV_ops,
+ .parts = &rpm8960_ldo_parts,
+};
+
+static const struct qcom_rpm_reg pm8921_nldo = {
+ .desc.linear_ranges = nldo_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
+ .desc.n_voltages = 64,
+ .desc.ops = &uV_ops,
+ .parts = &rpm8960_ldo_parts,
+};
+
+static const struct qcom_rpm_reg pm8921_nldo1200 = {
+ .desc.linear_ranges = nldo1200_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(nldo1200_ranges),
+ .desc.n_voltages = 124,
+ .desc.ops = &uV_ops,
+ .parts = &rpm8960_ldo_parts,
+};
+
+static const struct qcom_rpm_reg pm8921_smps = {
+ .desc.linear_ranges = smps_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
+ .desc.n_voltages = 154,
+ .desc.ops = &uV_ops,
+ .parts = &rpm8960_smps_parts,
+};
+
+static const struct qcom_rpm_reg pm8921_ftsmps = {
+ .desc.linear_ranges = ftsmps_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
+ .desc.n_voltages = 101,
+ .desc.ops = &uV_ops,
+ .parts = &rpm8960_smps_parts,
+};
+
+static const struct qcom_rpm_reg pm8921_ncp = {
+ .desc.linear_ranges = ncp_ranges,
+ .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
+ .desc.n_voltages = 32,
+ .desc.ops = &uV_ops,
+ .parts = &rpm8960_ncp_parts,
+};
+
+static const struct qcom_rpm_reg pm8921_switch = {
+ .desc.ops = &switch_ops,
+ .parts = &rpm8960_switch_parts,
+};
+
+static const struct of_device_id rpm_of_match[] = {
+ { .compatible = "qcom,rpm-pm8058-pldo", .data = &pm8058_pldo },
+ { .compatible = "qcom,rpm-pm8058-nldo", .data = &pm8058_nldo },
+ { .compatible = "qcom,rpm-pm8058-smps", .data = &pm8058_smps },
+ { .compatible = "qcom,rpm-pm8058-ncp", .data = &pm8058_ncp },
+ { .compatible = "qcom,rpm-pm8058-switch", .data = &pm8058_switch },
+
+ { .compatible = "qcom,rpm-pm8901-pldo", .data = &pm8901_pldo },
+ { .compatible = "qcom,rpm-pm8901-nldo", .data = &pm8901_nldo },
+ { .compatible = "qcom,rpm-pm8901-ftsmps", .data = &pm8901_ftsmps },
+ { .compatible = "qcom,rpm-pm8901-switch", .data = &pm8901_switch },
+
+ { .compatible = "qcom,rpm-pm8921-pldo", .data = &pm8921_pldo },
+ { .compatible = "qcom,rpm-pm8921-nldo", .data = &pm8921_nldo },
+ { .compatible = "qcom,rpm-pm8921-nldo1200", .data = &pm8921_nldo1200 },
+ { .compatible = "qcom,rpm-pm8921-smps", .data = &pm8921_smps },
+ { .compatible = "qcom,rpm-pm8921-ftsmps", .data = &pm8921_ftsmps },
+ { .compatible = "qcom,rpm-pm8921-ncp", .data = &pm8921_ncp },
+ { .compatible = "qcom,rpm-pm8921-switch", .data = &pm8921_switch },
+ { }
+};
+MODULE_DEVICE_TABLE(of, rpm_of_match);
+
+static int rpm_reg_set(struct qcom_rpm_reg *vreg,
+ const struct request_member *req,
+ const int value)
+{
+ if (req->mask == 0 || (value << req->shift) & ~req->mask)
+ return -EINVAL;
+
+ vreg->val[req->word] &= ~req->mask;
+ vreg->val[req->word] |= value << req->shift;
+
+ return 0;
+}
+
+static int rpm_reg_of_parse_freq(struct device *dev, struct qcom_rpm_reg *vreg)
+{
+ static const int freq_table[] = {
+ 19200000, 9600000, 6400000, 4800000, 3840000, 3200000, 2740000,
+ 2400000, 2130000, 1920000, 1750000, 1600000, 1480000, 1370000,
+ 1280000, 1200000,
+
+ };
+ const char *key;
+ u32 freq;
+ int ret;
+ int i;
+
+ key = "qcom,switch-mode-frequency";
+ ret = of_property_read_u32(dev->of_node, key, &freq);
+ if (ret) {
+ dev_err(dev, "regulator requires %s property\n", key);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
+ if (freq == freq_table[i]) {
+ rpm_reg_set(vreg, &vreg->parts->freq, i + 1);
+ return 0;
+ }
+ }
+
+ dev_err(dev, "invalid frequency %d\n", freq);
+ return -EINVAL;
+}
+
+static int rpm_reg_of_select_one(struct device *dev,
+ const char * const keys[],
+ const int count, int def)
+{
+ int found = -1;
+ int i;
+
+ for (i = 0; i < count; i++) {
+ if (!of_property_read_bool(dev->of_node, keys[i]))
+ continue;
+
+ if (found >= 0) {
+ dev_err(dev, "%s and %s are mutually exclusive\n",
+ keys[i], keys[found]);
+ return -EINVAL;
+ }
+ found = i;
+ }
+
+ if (found == -1)
+ return def;
+
+ return found;
+}
+
+static int rpm_reg_probe(struct platform_device *pdev)
+{
+ struct regulator_init_data *initdata;
+ const struct qcom_rpm_reg *template;
+ const struct of_device_id *match;
+ struct regulator_config config = { 0 };
+ struct regulator_dev *rdev;
+ struct qcom_rpm_reg *vreg;
+ const char *key;
+ u32 val;
+ int ret;
+
+ match = of_match_device(rpm_of_match, &pdev->dev);
+ template = match->data;
+
+ initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node);
+ if (!initdata)
+ return -EINVAL;
+
+ vreg = devm_kmalloc(&pdev->dev, sizeof(*vreg), GFP_KERNEL);
+ if (!vreg) {
+ dev_err(&pdev->dev, "failed to allocate vreg\n");
+ return -ENOMEM;
+ }
+ memcpy(vreg, template, sizeof(*vreg));
+ mutex_init(&vreg->lock);
+ vreg->dev = &pdev->dev;
+ vreg->desc.id = -1;
+ vreg->desc.owner = THIS_MODULE;
+ vreg->desc.type = REGULATOR_VOLTAGE;
+ vreg->desc.name = pdev->dev.of_node->name;
+
+ vreg->rpm = dev_get_qcom_rpm(pdev->dev.parent);
+ if (!vreg->rpm) {
+ dev_err(&pdev->dev, "unable to retrieve handle to rpm\n");
+ return -ENODEV;
+ }
+
+ key = "reg";
+ ret = of_property_read_u32(pdev->dev.of_node, key, &val);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to read %s\n", key);
+ return ret;
+ }
+ vreg->resource = val;
+
+ if ((vreg->parts->uV.mask || vreg->parts->mV.mask) &&
+ (!initdata->constraints.min_uV || !initdata->constraints.max_uV)) {
+ dev_err(&pdev->dev, "no voltage specified for regulator\n");
+ return -EINVAL;
+ }
+
+ key = "bias-pull-down";
+ if (of_property_read_bool(pdev->dev.of_node, key)) {
+ ret = rpm_reg_set(vreg, &vreg->parts->pd, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "%s is invalid", key);
+ return ret;
+ }
+ }
+
+ if (vreg->parts->freq.mask) {
+ ret = rpm_reg_of_parse_freq(&pdev->dev, vreg);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (vreg->parts->pm.mask) {
+ static const char * const keys[] = {
+ "qcom,power-mode-hysteretic",
+ "qcom,power-mode-pwm",
+ };
+
+ ret = rpm_reg_of_select_one(&pdev->dev,
+ keys, ARRAY_SIZE(keys), 1);
+ if (ret < 0)
+ return ret;
+
+ ret = rpm_reg_set(vreg, &vreg->parts->pm, ret);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to set power mode\n");
+ return ret;
+ }
+ }
+
+ if (FORCE_MODE_IS_2_BITS(vreg)) {
+ static const char * const keys[] = {
+ "qcom,force-mode-none",
+ "qcom,force-mode-lpm",
+ "qcom,force-mode-hpm"
+ };
+
+ ret = rpm_reg_of_select_one(&pdev->dev,
+ keys, ARRAY_SIZE(keys), 0);
+ if (ret < 0)
+ return ret;
+
+ ret = rpm_reg_set(vreg, &vreg->parts->fm, ret);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to set force mode\n");
+ return ret;
+ }
+ } else if (FORCE_MODE_IS_3_BITS(vreg)) {
+ static const char * const keys[] = {
+ "qcom,force-mode-none",
+ "qcom,force-mode-lpm",
+ "qcom,force-mode-auto",
+ "qcom,force-mode-hpm",
+ "qcom,force-mode-bypass",
+ };
+
+ ret = rpm_reg_of_select_one(&pdev->dev,
+ keys, ARRAY_SIZE(keys), 0);
+ if (ret < 0)
+ return ret;
+
+ ret = rpm_reg_set(vreg, &vreg->parts->fm, ret);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to set force mode\n");
+ return ret;
+ }
+ }
+
+ config.dev = &pdev->dev;
+ config.init_data = initdata;
+ config.driver_data = vreg;
+ config.of_node = pdev->dev.of_node;
+ rdev = devm_regulator_register(&pdev->dev, &vreg->desc, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "can't register regulator\n");
+ return PTR_ERR(rdev);
+ }
+
+ return 0;
+}
+
+static struct platform_driver rpm_reg_driver = {
+ .probe = rpm_reg_probe,
+ .driver = {
+ .name = "qcom_rpm_reg",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(rpm_of_match),
+ },
+};
+
+static int __init rpm_reg_init(void)
+{
+ return platform_driver_register(&rpm_reg_driver);
+}
+subsys_initcall(rpm_reg_init);
+
+static void __exit rpm_reg_exit(void)
+{
+ platform_driver_unregister(&rpm_reg_driver);
+}
+module_exit(rpm_reg_exit)
+
+MODULE_DESCRIPTION("Qualcomm RPM regulator driver");
+MODULE_LICENSE("GPL v2");
--
1.8.2.2