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156ec4731c
AMD Power Management Controller driver a.k.a. amd-pmc driver is the controller which is meant for the final S2Idle transaction that goes to the PMFW running on the AMD SMU (System Management Unit) responsible for tuning of the VDD. Once all the monitored list or the idle constraints are met, this driver would go and set the OS_HINT (meaning all the devices have reached to their lowest state possible) via the SMU mailboxes. This driver would also provide some debug capabilities via debugfs. Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20201105140531.2955555-1-Shyam-sundar.S-k@amd.com Signed-off-by: Hans de Goede <hdegoede@redhat.com>
286 lines
7.2 KiB
C
286 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AMD SoC Power Management Controller Driver
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*
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* Copyright (c) 2020, Advanced Micro Devices, Inc.
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* All Rights Reserved.
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*
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* Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/bitfield.h>
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#include <linux/bits.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/suspend.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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/* SMU communication registers */
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#define AMD_PMC_REGISTER_MESSAGE 0x538
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#define AMD_PMC_REGISTER_RESPONSE 0x980
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#define AMD_PMC_REGISTER_ARGUMENT 0x9BC
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/* Base address of SMU for mapping physical address to virtual address */
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#define AMD_PMC_SMU_INDEX_ADDRESS 0xB8
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#define AMD_PMC_SMU_INDEX_DATA 0xBC
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#define AMD_PMC_MAPPING_SIZE 0x01000
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#define AMD_PMC_BASE_ADDR_OFFSET 0x10000
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#define AMD_PMC_BASE_ADDR_LO 0x13B102E8
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#define AMD_PMC_BASE_ADDR_HI 0x13B102EC
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#define AMD_PMC_BASE_ADDR_LO_MASK GENMASK(15, 0)
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#define AMD_PMC_BASE_ADDR_HI_MASK GENMASK(31, 20)
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/* SMU Response Codes */
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#define AMD_PMC_RESULT_OK 0x01
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#define AMD_PMC_RESULT_CMD_REJECT_BUSY 0xFC
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#define AMD_PMC_RESULT_CMD_REJECT_PREREQ 0xFD
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#define AMD_PMC_RESULT_CMD_UNKNOWN 0xFE
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#define AMD_PMC_RESULT_FAILED 0xFF
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/* List of supported CPU ids */
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#define AMD_CPU_ID_RV 0x15D0
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#define AMD_CPU_ID_RN 0x1630
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#define AMD_CPU_ID_PCO AMD_CPU_ID_RV
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#define AMD_CPU_ID_CZN AMD_CPU_ID_RN
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#define AMD_SMU_FW_VERSION 0x0
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#define PMC_MSG_DELAY_MIN_US 100
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#define RESPONSE_REGISTER_LOOP_MAX 200
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enum amd_pmc_def {
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MSG_TEST = 0x01,
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MSG_OS_HINT_PCO,
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MSG_OS_HINT_RN,
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};
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struct amd_pmc_dev {
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void __iomem *regbase;
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void __iomem *smu_base;
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u32 base_addr;
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u32 cpu_id;
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struct device *dev;
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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struct dentry *dbgfs_dir;
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#endif /* CONFIG_DEBUG_FS */
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};
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static struct amd_pmc_dev pmc;
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static inline u32 amd_pmc_reg_read(struct amd_pmc_dev *dev, int reg_offset)
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{
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return ioread32(dev->regbase + reg_offset);
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}
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static inline void amd_pmc_reg_write(struct amd_pmc_dev *dev, int reg_offset, u32 val)
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{
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iowrite32(val, dev->regbase + reg_offset);
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}
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#if CONFIG_DEBUG_FS
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static int smu_fw_info_show(struct seq_file *s, void *unused)
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{
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struct amd_pmc_dev *dev = s->private;
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u32 value;
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value = ioread32(dev->smu_base + AMD_SMU_FW_VERSION);
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seq_printf(s, "SMU FW Info: %x\n", value);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(smu_fw_info);
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static void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev)
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{
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debugfs_remove_recursive(dev->dbgfs_dir);
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}
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static void amd_pmc_dbgfs_register(struct amd_pmc_dev *dev)
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{
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dev->dbgfs_dir = debugfs_create_dir("amd_pmc", NULL);
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debugfs_create_file("smu_fw_info", 0644, dev->dbgfs_dir, dev,
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&smu_fw_info_fops);
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}
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#else
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static inline void amd_pmc_dbgfs_register(struct amd_pmc_dev *dev)
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{
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}
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static inline void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev)
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{
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}
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#endif /* CONFIG_DEBUG_FS */
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static void amd_pmc_dump_registers(struct amd_pmc_dev *dev)
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{
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u32 value;
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value = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_RESPONSE);
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dev_dbg(dev->dev, "AMD_PMC_REGISTER_RESPONSE:%x\n", value);
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value = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_ARGUMENT);
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dev_dbg(dev->dev, "AMD_PMC_REGISTER_ARGUMENT:%x\n", value);
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value = amd_pmc_reg_read(dev, AMD_PMC_REGISTER_MESSAGE);
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dev_dbg(dev->dev, "AMD_PMC_REGISTER_MESSAGE:%x\n", value);
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}
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static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, bool set)
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{
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int rc;
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u8 msg;
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u32 val;
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/* Wait until we get a valid response */
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rc = readx_poll_timeout(ioread32, dev->regbase + AMD_PMC_REGISTER_RESPONSE,
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val, val > 0, PMC_MSG_DELAY_MIN_US,
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PMC_MSG_DELAY_MIN_US * RESPONSE_REGISTER_LOOP_MAX);
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if (rc) {
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dev_err(dev->dev, "failed to talk to SMU\n");
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return rc;
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}
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/* Write zero to response register */
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amd_pmc_reg_write(dev, AMD_PMC_REGISTER_RESPONSE, 0);
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/* Write argument into response register */
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amd_pmc_reg_write(dev, AMD_PMC_REGISTER_ARGUMENT, set);
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/* Write message ID to message ID register */
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msg = (dev->cpu_id == AMD_CPU_ID_RN) ? MSG_OS_HINT_RN : MSG_OS_HINT_PCO;
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amd_pmc_reg_write(dev, AMD_PMC_REGISTER_MESSAGE, msg);
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return 0;
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}
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static int __maybe_unused amd_pmc_suspend(struct device *dev)
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{
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struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
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int rc;
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rc = amd_pmc_send_cmd(pdev, 1);
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if (rc)
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dev_err(pdev->dev, "suspend failed\n");
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amd_pmc_dump_registers(pdev);
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return 0;
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}
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static int __maybe_unused amd_pmc_resume(struct device *dev)
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{
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struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
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int rc;
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rc = amd_pmc_send_cmd(pdev, 0);
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if (rc)
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dev_err(pdev->dev, "resume failed\n");
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amd_pmc_dump_registers(pdev);
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return 0;
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}
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static const struct dev_pm_ops amd_pmc_pm_ops = {
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SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(amd_pmc_suspend, amd_pmc_resume)
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};
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static const struct pci_device_id pmc_pci_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_CZN) },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RN) },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PCO) },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_RV) },
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{ }
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};
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static int amd_pmc_probe(struct platform_device *pdev)
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{
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struct amd_pmc_dev *dev = &pmc;
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struct pci_dev *rdev;
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u32 base_addr_lo;
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u32 base_addr_hi;
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u64 base_addr;
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int err;
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u32 val;
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dev->dev = &pdev->dev;
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rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
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if (!rdev || !pci_match_id(pmc_pci_ids, rdev))
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return -ENODEV;
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dev->cpu_id = rdev->device;
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err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_LO);
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if (err) {
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dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS);
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return pcibios_err_to_errno(err);
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}
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err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val);
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if (err)
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return pcibios_err_to_errno(err);
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base_addr_lo = val & AMD_PMC_BASE_ADDR_HI_MASK;
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err = pci_write_config_dword(rdev, AMD_PMC_SMU_INDEX_ADDRESS, AMD_PMC_BASE_ADDR_HI);
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if (err) {
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dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMC_SMU_INDEX_ADDRESS);
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return pcibios_err_to_errno(err);
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}
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err = pci_read_config_dword(rdev, AMD_PMC_SMU_INDEX_DATA, &val);
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if (err)
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return pcibios_err_to_errno(err);
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base_addr_hi = val & AMD_PMC_BASE_ADDR_LO_MASK;
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pci_dev_put(rdev);
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base_addr = ((u64)base_addr_hi << 32 | base_addr_lo);
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dev->smu_base = devm_ioremap(dev->dev, base_addr, AMD_PMC_MAPPING_SIZE);
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if (!dev->smu_base)
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return -ENOMEM;
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dev->regbase = devm_ioremap(dev->dev, base_addr + AMD_PMC_BASE_ADDR_OFFSET,
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AMD_PMC_MAPPING_SIZE);
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if (!dev->regbase)
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return -ENOMEM;
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amd_pmc_dump_registers(dev);
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platform_set_drvdata(pdev, dev);
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amd_pmc_dbgfs_register(dev);
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return 0;
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}
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static int amd_pmc_remove(struct platform_device *pdev)
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{
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struct amd_pmc_dev *dev = platform_get_drvdata(pdev);
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amd_pmc_dbgfs_unregister(dev);
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return 0;
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}
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static const struct acpi_device_id amd_pmc_acpi_ids[] = {
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{"AMDI0005", 0},
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{"AMD0004", 0},
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, amd_pmc_acpi_ids);
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static struct platform_driver amd_pmc_driver = {
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.driver = {
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.name = "amd_pmc",
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.acpi_match_table = amd_pmc_acpi_ids,
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.pm = &amd_pmc_pm_ops,
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},
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.probe = amd_pmc_probe,
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.remove = amd_pmc_remove,
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};
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module_platform_driver(amd_pmc_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("AMD PMC Driver");
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