diff --git a/drivers/platform/x86/amd/pmf/Makefile b/drivers/platform/x86/amd/pmf/Makefile
index 459005f659e55f6c509daf8feb06dafc56587e76..2617eba773ceb40202f59748838ea9555356132e 100644
--- a/drivers/platform/x86/amd/pmf/Makefile
+++ b/drivers/platform/x86/amd/pmf/Makefile
@@ -5,4 +5,4 @@
#
obj-$(CONFIG_AMD_PMF) += amd-pmf.o
-amd-pmf-objs := core.o
+amd-pmf-objs := core.o acpi.o
diff --git a/drivers/platform/x86/amd/pmf/acpi.c b/drivers/platform/x86/amd/pmf/acpi.c
new file mode 100644
index 0000000000000000000000000000000000000000..b378f9e31194a70cfaafa923d1c0f58b937c9413
--- /dev/null
+++ b/drivers/platform/x86/amd/pmf/acpi.c
@@ -0,0 +1,151 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AMD Platform Management Framework Driver
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
+ */
+
+#include <linux/acpi.h>
+#include "pmf.h"
+
+static union acpi_object *apmf_if_call(struct amd_pmf_dev *pdev, int fn, struct acpi_buffer *param)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
+ struct acpi_object_list apmf_if_arg_list;
+ union acpi_object apmf_if_args[2];
+ acpi_status status;
+
+ apmf_if_arg_list.count = 2;
+ apmf_if_arg_list.pointer = &apmf_if_args[0];
+
+ apmf_if_args[0].type = ACPI_TYPE_INTEGER;
+ apmf_if_args[0].integer.value = fn;
+
+ if (param) {
+ apmf_if_args[1].type = ACPI_TYPE_BUFFER;
+ apmf_if_args[1].buffer.length = param->length;
+ apmf_if_args[1].buffer.pointer = param->pointer;
+ } else {
+ apmf_if_args[1].type = ACPI_TYPE_INTEGER;
+ apmf_if_args[1].integer.value = 0;
+ }
+
+ status = acpi_evaluate_object(ahandle, "APMF", &apmf_if_arg_list, &buffer);
+ if (ACPI_FAILURE(status)) {
+ dev_err(pdev->dev, "APMF method:%d call failed\n", fn);
+ kfree(buffer.pointer);
+ return NULL;
+ }
+
+ return buffer.pointer;
+}
+
+static int apmf_if_call_store_buffer(struct amd_pmf_dev *pdev, int fn, void *dest, size_t out_sz)
+{
+ union acpi_object *info;
+ size_t size;
+ int err = 0;
+
+ info = apmf_if_call(pdev, fn, NULL);
+ if (!info)
+ return -EIO;
+
+ if (info->type != ACPI_TYPE_BUFFER) {
+ dev_err(pdev->dev, "object is not a buffer\n");
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (info->buffer.length < 2) {
+ dev_err(pdev->dev, "buffer too small\n");
+ err = -EINVAL;
+ goto out;
+ }
+
+ size = *(u16 *)info->buffer.pointer;
+ if (info->buffer.length < size) {
+ dev_err(pdev->dev, "buffer smaller then headersize %u < %zu\n",
+ info->buffer.length, size);
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (size < out_sz) {
+ dev_err(pdev->dev, "buffer too small %zu\n", size);
+ err = -EINVAL;
+ goto out;
+ }
+
+ memcpy(dest, info->buffer.pointer, out_sz);
+
+out:
+ kfree(info);
+ return err;
+}
+
+int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
+{
+ /* If bit-n is set, that indicates function n+1 is supported */
+ return !!(pdev->supported_func & BIT(index - 1));
+}
+
+static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
+{
+ struct apmf_verify_interface output;
+ int err;
+
+ err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
+ if (err)
+ return err;
+
+ pdev->supported_func = output.supported_functions;
+ dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x\n",
+ output.supported_functions, output.notification_mask);
+
+ return 0;
+}
+
+static int apmf_get_system_params(struct amd_pmf_dev *dev)
+{
+ struct apmf_system_params params;
+ int err;
+
+ if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
+ return -EINVAL;
+
+ err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, ¶ms, sizeof(params));
+ if (err)
+ return err;
+
+ dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x\n",
+ params.valid_mask,
+ params.flags,
+ params.command_code);
+ params.flags = params.flags & params.valid_mask;
+
+ return 0;
+}
+
+int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
+{
+ int ret;
+
+ ret = apmf_if_verify_interface(pmf_dev);
+ if (ret) {
+ dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
+ goto out;
+ }
+
+ ret = apmf_get_system_params(pmf_dev);
+ if (ret) {
+ dev_err(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
+ goto out;
+ }
+
+out:
+ return ret;
+}
diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
index aef97965c181247ae7062256d69957e6bba9fabd..c5002b7bb9046b5bd1ab2a671575e3461e619617 100644
--- a/drivers/platform/x86/amd/pmf/core.c
+++ b/drivers/platform/x86/amd/pmf/core.c
@@ -204,6 +204,7 @@ static int amd_pmf_probe(struct platform_device *pdev)
if (!dev->regbase)
return -ENOMEM;
+ apmf_acpi_init(dev);
platform_set_drvdata(pdev, dev);
mutex_init(&dev->lock);
diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
index 1c2e942e5096eec596f194b9f4672bcaa362f5b4..bdadbff168ee3217279a3d7ec3ffbb2891ab323a 100644
--- a/drivers/platform/x86/amd/pmf/pmf.h
+++ b/drivers/platform/x86/amd/pmf/pmf.h
@@ -11,6 +11,12 @@
#ifndef PMF_H
#define PMF_H
+#include <linux/acpi.h>
+
+/* APMF Functions */
+#define APMF_FUNC_VERIFY_INTERFACE 0
+#define APMF_FUNC_GET_SYS_PARAMS 1
+
/* Message Definitions */
#define SET_SPL 0x03 /* SPL: Sustained Power Limit */
#define SET_SPPT 0x05 /* SPPT: Slow Package Power Tracking */
@@ -30,6 +36,21 @@
#define GET_STT_LIMIT_APU 0x20
#define GET_STT_LIMIT_HS2 0x21
+/* AMD PMF BIOS interfaces */
+struct apmf_verify_interface {
+ u16 size;
+ u16 version;
+ u32 notification_mask;
+ u32 supported_functions;
+} __packed;
+
+struct apmf_system_params {
+ u16 size;
+ u32 valid_mask;
+ u32 flags;
+ u8 command_code;
+} __packed;
+
struct amd_pmf_dev {
void __iomem *regbase;
void __iomem *smu_virt_addr;
@@ -38,9 +59,11 @@ struct amd_pmf_dev {
u32 cpu_id;
struct device *dev;
struct mutex lock; /* protects the PMF interface */
+ u32 supported_func;
};
/* Core Layer */
+int apmf_acpi_init(struct amd_pmf_dev *pmf_dev);
int amd_pmf_send_cmd(struct amd_pmf_dev *dev, u8 message, bool get, u32 arg, u32 *data);
#endif /* PMF_H */