platform/x86/amd/pmf: Add support for PMF core layer (da5ce22d) · Commits · EulixOS / Software / Kernel

drivers/platform/x86/amd/Kconfig

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		@@ -3,6 +3,8 @@
		# AMD x86 Platform Specific Drivers
		#

		source "drivers/platform/x86/amd/pmf/Kconfig"

		config AMD_PMC
		tristate "AMD SoC PMC driver"
		depends on ACPI && PCI && RTC_CLASS

drivers/platform/x86/amd/Makefile

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		@@ -8,3 +8,4 @@ amd-pmc-y := pmc.o
		obj-$(CONFIG_AMD_PMC) += amd-pmc.o
		amd_hsmp-y := hsmp.o
		obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o
		obj-$(CONFIG_AMD_PMF) += pmf/

drivers/platform/x86/amd/pmf/Kconfig

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		# SPDX-License-Identifier: GPL-2.0-only
		#
		# AMD PMF Driver
		#

		config AMD_PMF
		tristate "AMD Platform Management Framework"
		depends on ACPI && PCI
		help
		This driver provides support for the AMD Platform Management Framework.
		The goal is to enhance end user experience by making AMD PCs smarter,
		quiter, power efficient by adapting to user behavior and environment.

		To compile this driver as a module, choose M here: the module will
		be called amd_pmf.

drivers/platform/x86/amd/pmf/Makefile

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		# SPDX-License-Identifier: GPL-2.0
		#
		# Makefile for linux/drivers/platform/x86/amd/pmf
		# AMD Platform Management Framework
		#

		obj-$(CONFIG_AMD_PMF) += amd-pmf.o
		amd-pmf-objs := core.o

drivers/platform/x86/amd/pmf/core.c

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		// SPDX-License-Identifier: GPL-2.0-or-later
		/*
		* 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/iopoll.h>
		#include <linux/module.h>
		#include <linux/pci.h>
		#include <linux/platform_device.h>
		#include "pmf.h"

		/* PMF-SMU communication registers */
		#define AMD_PMF_REGISTER_MESSAGE 0xA18
		#define AMD_PMF_REGISTER_RESPONSE 0xA78
		#define AMD_PMF_REGISTER_ARGUMENT 0xA58

		/* Base address of SMU for mapping physical address to virtual address */
		#define AMD_PMF_SMU_INDEX_ADDRESS 0xB8
		#define AMD_PMF_SMU_INDEX_DATA 0xBC
		#define AMD_PMF_MAPPING_SIZE 0x01000
		#define AMD_PMF_BASE_ADDR_OFFSET 0x10000
		#define AMD_PMF_BASE_ADDR_LO 0x13B102E8
		#define AMD_PMF_BASE_ADDR_HI 0x13B102EC
		#define AMD_PMF_BASE_ADDR_LO_MASK GENMASK(15, 0)
		#define AMD_PMF_BASE_ADDR_HI_MASK GENMASK(31, 20)

		/* SMU Response Codes */
		#define AMD_PMF_RESULT_OK 0x01
		#define AMD_PMF_RESULT_CMD_REJECT_BUSY 0xFC
		#define AMD_PMF_RESULT_CMD_REJECT_PREREQ 0xFD
		#define AMD_PMF_RESULT_CMD_UNKNOWN 0xFE
		#define AMD_PMF_RESULT_FAILED 0xFF

		/* List of supported CPU ids */
		#define AMD_CPU_ID_PS 0x14e8

		#define PMF_MSG_DELAY_MIN_US 50
		#define RESPONSE_REGISTER_LOOP_MAX 20000

		#define DELAY_MIN_US 2000
		#define DELAY_MAX_US 3000

		static inline u32 amd_pmf_reg_read(struct amd_pmf_dev *dev, int reg_offset)
		{
		return ioread32(dev->regbase + reg_offset);
		}

		static inline void amd_pmf_reg_write(struct amd_pmf_dev *dev, int reg_offset, u32 val)
		{
		iowrite32(val, dev->regbase + reg_offset);
		}

		static void __maybe_unused amd_pmf_dump_registers(struct amd_pmf_dev *dev)
		{
		u32 value;

		value = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_RESPONSE);
		dev_dbg(dev->dev, "AMD_PMF_REGISTER_RESPONSE:%x\n", value);

		value = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_ARGUMENT);
		dev_dbg(dev->dev, "AMD_PMF_REGISTER_ARGUMENT:%d\n", value);

		value = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_MESSAGE);
		dev_dbg(dev->dev, "AMD_PMF_REGISTER_MESSAGE:%x\n", value);
		}

		int amd_pmf_send_cmd(struct amd_pmf_dev dev, u8 message, bool get, u32 arg, u32 data)
		{
		int rc;
		u32 val;

		mutex_lock(&dev->lock);

		/* Wait until we get a valid response */
		rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMF_REGISTER_RESPONSE,
		val, val != 0, PMF_MSG_DELAY_MIN_US,
		PMF_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX);
		if (rc) {
		dev_err(dev->dev, "failed to talk to SMU\n");
		goto out_unlock;
		}

		/* Write zero to response register */
		amd_pmf_reg_write(dev, AMD_PMF_REGISTER_RESPONSE, 0);

		/* Write argument into argument register */
		amd_pmf_reg_write(dev, AMD_PMF_REGISTER_ARGUMENT, arg);

		/* Write message ID to message ID register */
		amd_pmf_reg_write(dev, AMD_PMF_REGISTER_MESSAGE, message);

		/* Wait until we get a valid response */
		rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMF_REGISTER_RESPONSE,
		val, val != 0, PMF_MSG_DELAY_MIN_US,
		PMF_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX);
		if (rc) {
		dev_err(dev->dev, "SMU response timed out\n");
		goto out_unlock;
		}

		switch (val) {
		case AMD_PMF_RESULT_OK:
		if (get) {
		/* PMFW may take longer time to return back the data */
		usleep_range(DELAY_MIN_US, 10 * DELAY_MAX_US);
		*data = amd_pmf_reg_read(dev, AMD_PMF_REGISTER_ARGUMENT);
		}
		break;
		case AMD_PMF_RESULT_CMD_REJECT_BUSY:
		dev_err(dev->dev, "SMU not ready. err: 0x%x\n", val);
		rc = -EBUSY;
		goto out_unlock;
		case AMD_PMF_RESULT_CMD_UNKNOWN:
		dev_err(dev->dev, "SMU cmd unknown. err: 0x%x\n", val);
		rc = -EINVAL;
		goto out_unlock;
		case AMD_PMF_RESULT_CMD_REJECT_PREREQ:
		case AMD_PMF_RESULT_FAILED:
		default:
		dev_err(dev->dev, "SMU cmd failed. err: 0x%x\n", val);
		rc = -EIO;
		goto out_unlock;
		}

		out_unlock:
		mutex_unlock(&dev->lock);
		amd_pmf_dump_registers(dev);
		return rc;
		}

		static const struct pci_device_id pmf_pci_ids[] = {
		{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PS) },
		{ }
		};

		static const struct acpi_device_id amd_pmf_acpi_ids[] = {
		{"AMDI0102", 0},
		{ }
		};
		MODULE_DEVICE_TABLE(acpi, amd_pmf_acpi_ids);

		static int amd_pmf_probe(struct platform_device *pdev)
		{
		struct amd_pmf_dev *dev;
		struct pci_dev *rdev;
		u32 base_addr_lo;
		u32 base_addr_hi;
		u64 base_addr;
		u32 val;
		int err;

		dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
		if (!dev)
		return -ENOMEM;

		dev->dev = &pdev->dev;

		rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
		if (!rdev \|\| !pci_match_id(pmf_pci_ids, rdev)) {
		pci_dev_put(rdev);
		return -ENODEV;
		}

		dev->cpu_id = rdev->device;
		err = pci_write_config_dword(rdev, AMD_PMF_SMU_INDEX_ADDRESS, AMD_PMF_BASE_ADDR_LO);
		if (err) {
		dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMF_SMU_INDEX_ADDRESS);
		pci_dev_put(rdev);
		return pcibios_err_to_errno(err);
		}

		err = pci_read_config_dword(rdev, AMD_PMF_SMU_INDEX_DATA, &val);
		if (err) {
		pci_dev_put(rdev);
		return pcibios_err_to_errno(err);
		}

		base_addr_lo = val & AMD_PMF_BASE_ADDR_HI_MASK;

		err = pci_write_config_dword(rdev, AMD_PMF_SMU_INDEX_ADDRESS, AMD_PMF_BASE_ADDR_HI);
		if (err) {
		dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMF_SMU_INDEX_ADDRESS);
		pci_dev_put(rdev);
		return pcibios_err_to_errno(err);
		}

		err = pci_read_config_dword(rdev, AMD_PMF_SMU_INDEX_DATA, &val);
		if (err) {
		pci_dev_put(rdev);
		return pcibios_err_to_errno(err);
		}

		base_addr_hi = val & AMD_PMF_BASE_ADDR_LO_MASK;
		pci_dev_put(rdev);
		base_addr = ((u64)base_addr_hi << 32 \| base_addr_lo);

		dev->regbase = devm_ioremap(dev->dev, base_addr + AMD_PMF_BASE_ADDR_OFFSET,
		AMD_PMF_MAPPING_SIZE);
		if (!dev->regbase)
		return -ENOMEM;

		platform_set_drvdata(pdev, dev);

		mutex_init(&dev->lock);
		dev_info(dev->dev, "registered PMF device successfully\n");

		return 0;
		}

		static int amd_pmf_remove(struct platform_device *pdev)
		{
		struct amd_pmf_dev *dev = platform_get_drvdata(pdev);

		mutex_destroy(&dev->lock);
		kfree(dev->buf);
		return 0;
		}

		static struct platform_driver amd_pmf_driver = {
		.driver = {
		.name = "amd-pmf",
		.acpi_match_table = amd_pmf_acpi_ids,
		},
		.probe = amd_pmf_probe,
		.remove = amd_pmf_remove,
		};
		module_platform_driver(amd_pmf_driver);

		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("AMD Platform Management Framework Driver");