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c893ee3f95
Some of the ACP drivers will poll registers through SMN using read_poll_timeout() which requires returning the result of the register read as the argument. Add a helper to do just that. Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20250217231747.1656228-2-superm1@kernel.org
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* AMD Node helper functions and common defines
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*
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* Copyright (c) 2024, Advanced Micro Devices, Inc.
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* All Rights Reserved.
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*
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* Author: Yazen Ghannam <Yazen.Ghannam@amd.com>
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*
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* Note:
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* Items in this file may only be used in a single place.
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* However, it's prudent to keep all AMD Node functionality
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* in a unified place rather than spreading throughout the
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* kernel.
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*/
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#ifndef _ASM_X86_AMD_NODE_H_
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#define _ASM_X86_AMD_NODE_H_
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#include <linux/pci.h>
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#define MAX_AMD_NUM_NODES 8
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#define AMD_NODE0_PCI_SLOT 0x18
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struct pci_dev *amd_node_get_func(u16 node, u8 func);
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struct pci_dev *amd_node_get_root(u16 node);
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static inline u16 amd_num_nodes(void)
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{
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return topology_amd_nodes_per_pkg() * topology_max_packages();
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}
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#ifdef CONFIG_AMD_NODE
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int __must_check amd_smn_read(u16 node, u32 address, u32 *value);
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int __must_check amd_smn_write(u16 node, u32 address, u32 value);
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/* Should only be used by the HSMP driver. */
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int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write);
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#else
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static inline int __must_check amd_smn_read(u16 node, u32 address, u32 *value) { return -ENODEV; }
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static inline int __must_check amd_smn_write(u16 node, u32 address, u32 value) { return -ENODEV; }
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static inline int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *value, bool write)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_AMD_NODE */
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/* helper for use with read_poll_timeout */
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static inline int smn_read_register(u32 reg)
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{
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int data, rc;
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rc = amd_smn_read(0, reg, &data);
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if (rc)
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return rc;
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return data;
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}
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#endif /*_ASM_X86_AMD_NODE_H_*/
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