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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2020-09-15 16:18:14 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-09-18 18:13:56 +0200
commit2ce6324eadb014136a4baaf7a174f47d771364a0 (patch)
tree7878f0298489bbc3256dc8bbc127edfe6bb1917c /drivers/acpi/dptf
parent856deb866d16e29bd65952e0289066f6078af773 (diff)
ACPI: DPTF: Add PCH FIVR participant driver
This driver adds support for Dynamic Platform and Thermal Framework (DPTF) PCH (Platform Controller Hub) FIVR (Fully Integrated Voltage Regulator) participant support. This participant is responsible for exposing platform telemetry and control for: freq_mhz_high_clock freq_mhz_low_clock These attributes are used to get and set PCH FIVR switching frequency for thermal and radio frequency interference mitigation. Refer to Documentation/ABI/testing/sysfs-platform-dptf for ABI details. ACPI methods description used in this driver: RFC0: This ACPI method to set PCH FIVR switching frequency when FIVR clock is 19.2MHz or 24MHz. The ACPI method takes a DWORD value. GFC0: This ACPI method to get PCH FIVR switching frequency when FIVR clock is 19.2MHz or 24MHz. RFC1: This ACPI method to set PCH FIVR switching frequency when FIVR clock is 38.4MHz. The ACPI method takes a DWORD value. GFC1: This ACPI method to get PCH FIVR switching frequency when FIVR clock is 38.4MHz. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/dptf')
-rw-r--r--drivers/acpi/dptf/Kconfig14
-rw-r--r--drivers/acpi/dptf/Makefile1
-rw-r--r--drivers/acpi/dptf/dptf_pch_fivr.c126
-rw-r--r--drivers/acpi/dptf/int340x_thermal.c1
4 files changed, 142 insertions, 0 deletions
diff --git a/drivers/acpi/dptf/Kconfig b/drivers/acpi/dptf/Kconfig
index 90a2fd979282..51f06f36cafa 100644
--- a/drivers/acpi/dptf/Kconfig
+++ b/drivers/acpi/dptf/Kconfig
@@ -14,3 +14,17 @@ config DPTF_POWER
To compile this driver as a module, choose M here:
the module will be called dptf_power.
+
+config DPTF_PCH_FIVR
+ tristate "DPTF PCH FIVR Participant"
+ depends on X86
+ help
+ This driver adds support for Dynamic Platform and Thermal Framework
+ (DPTF) PCH FIVR Participant device support. This driver allows to
+ switch PCH FIVR (Fully Integrated Voltage Regulator) frequency.
+ This participant is responsible for exposing:
+ freq_mhz_low_clock
+ freq_mhz_high_clock
+
+ To compile this driver as a module, choose M here:
+ the module will be called dptf_pch_fivr.
diff --git a/drivers/acpi/dptf/Makefile b/drivers/acpi/dptf/Makefile
index 1a9b0a2b25bf..297340682f66 100644
--- a/drivers/acpi/dptf/Makefile
+++ b/drivers/acpi/dptf/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_ACPI) += int340x_thermal.o
obj-$(CONFIG_DPTF_POWER) += dptf_power.o
+obj-$(CONFIG_DPTF_PCH_FIVR) += dptf_pch_fivr.o
diff --git a/drivers/acpi/dptf/dptf_pch_fivr.c b/drivers/acpi/dptf/dptf_pch_fivr.c
new file mode 100644
index 000000000000..4ab288827747
--- /dev/null
+++ b/drivers/acpi/dptf/dptf_pch_fivr.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * dptf_pch_fivr: DPTF PCH FIVR Participant driver
+ * Copyright (c) 2020, Intel Corporation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+/*
+ * Presentation of attributes which are defined for INT1045
+ * They are:
+ * freq_mhz_low_clock : Set PCH FIVR switching freq for
+ * FIVR clock 19.2MHz and 24MHz
+ * freq_mhz_high_clock : Set PCH FIVR switching freq for
+ * FIVR clock 38.4MHz
+ */
+#define PCH_FIVR_SHOW(name, method) \
+static ssize_t name##_show(struct device *dev,\
+ struct device_attribute *attr,\
+ char *buf)\
+{\
+ struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
+ unsigned long long val;\
+ acpi_status status;\
+\
+ status = acpi_evaluate_integer(acpi_dev->handle, #method,\
+ NULL, &val);\
+ if (ACPI_SUCCESS(status))\
+ return sprintf(buf, "%d\n", (int)val);\
+ else\
+ return -EINVAL;\
+}
+
+#define PCH_FIVR_STORE(name, method) \
+static ssize_t name##_store(struct device *dev,\
+ struct device_attribute *attr,\
+ const char *buf, size_t count)\
+{\
+ struct acpi_device *acpi_dev = dev_get_drvdata(dev);\
+ acpi_status status;\
+ u32 val;\
+\
+ if (kstrtouint(buf, 0, &val) < 0)\
+ return -EINVAL;\
+\
+ status = acpi_execute_simple_method(acpi_dev->handle, #method, val);\
+ if (ACPI_SUCCESS(status))\
+ return count;\
+\
+ return -EINVAL;\
+}
+
+PCH_FIVR_SHOW(freq_mhz_low_clock, GFC0)
+PCH_FIVR_SHOW(freq_mhz_high_clock, GFC1)
+PCH_FIVR_STORE(freq_mhz_low_clock, RFC0)
+PCH_FIVR_STORE(freq_mhz_high_clock, RFC1)
+
+static DEVICE_ATTR_RW(freq_mhz_low_clock);
+static DEVICE_ATTR_RW(freq_mhz_high_clock);
+
+static struct attribute *fivr_attrs[] = {
+ &dev_attr_freq_mhz_low_clock.attr,
+ &dev_attr_freq_mhz_high_clock.attr,
+ NULL
+};
+
+static const struct attribute_group pch_fivr_attribute_group = {
+ .attrs = fivr_attrs,
+ .name = "pch_fivr_switch_frequency"
+};
+
+static int pch_fivr_add(struct platform_device *pdev)
+{
+ struct acpi_device *acpi_dev;
+ unsigned long long ptype;
+ acpi_status status;
+ int result;
+
+ acpi_dev = ACPI_COMPANION(&(pdev->dev));
+ if (!acpi_dev)
+ return -ENODEV;
+
+ status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype);
+ if (ACPI_FAILURE(status) || ptype != 0x05)
+ return -ENODEV;
+
+ result = sysfs_create_group(&pdev->dev.kobj,
+ &pch_fivr_attribute_group);
+ if (result)
+ return result;
+
+ platform_set_drvdata(pdev, acpi_dev);
+
+ return 0;
+}
+
+static int pch_fivr_remove(struct platform_device *pdev)
+{
+ sysfs_remove_group(&pdev->dev.kobj, &pch_fivr_attribute_group);
+
+ return 0;
+}
+
+static const struct acpi_device_id pch_fivr_device_ids[] = {
+ {"INTC1045", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, pch_fivr_device_ids);
+
+static struct platform_driver pch_fivr_driver = {
+ .probe = pch_fivr_add,
+ .remove = pch_fivr_remove,
+ .driver = {
+ .name = "DPTF PCH FIVR",
+ .acpi_match_table = pch_fivr_device_ids,
+ },
+};
+
+module_platform_driver(pch_fivr_driver);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ACPI DPTF PCH FIVR driver");
diff --git a/drivers/acpi/dptf/int340x_thermal.c b/drivers/acpi/dptf/int340x_thermal.c
index bc71a6a60334..8d420c7e7178 100644
--- a/drivers/acpi/dptf/int340x_thermal.c
+++ b/drivers/acpi/dptf/int340x_thermal.c
@@ -27,6 +27,7 @@ static const struct acpi_device_id int340x_thermal_device_ids[] = {
{"INTC1040"},
{"INTC1043"},
{"INTC1044"},
+ {"INTC1045"},
{"INTC1047"},
{""},
};