63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* Copyright 2019 Google Inc
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Provides a simple driver to control the ASPEED P2A interface which allows
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* the host to read and write to various regions of the BMC's memory.
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*/
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#ifndef _LINUX_ASPEED_P2A_CTRL_H
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#define _LINUX_ASPEED_P2A_CTRL_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#define ASPEED_P2A_CTRL_READ_ONLY 0
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#define ASPEED_P2A_CTRL_READWRITE 1
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/*
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* This driver provides a mechanism for enabling or disabling the read-write
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* property of specific windows into the ASPEED BMC's memory.
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*
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* A user can map a region of the BMC's memory as read-only or read-write, with
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* the caveat that once any region is mapped, all regions are unlocked for
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* reading.
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*/
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/*
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* Unlock a region of BMC physical memory for access from the host.
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*
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* Also used to read back the optional memory-region configuration for the
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* driver.
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*/
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struct aspeed_p2a_ctrl_mapping {
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__u64 addr;
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__u32 length;
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__u32 flags;
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};
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#define __ASPEED_P2A_CTRL_IOCTL_MAGIC 0xb3
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/*
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* This IOCTL is meant to configure a region or regions of memory given a
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* starting address and length to be readable by the host, or
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* readable-writeable.
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*/
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#define ASPEED_P2A_CTRL_IOCTL_SET_WINDOW _IOW(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \
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0x00, struct aspeed_p2a_ctrl_mapping)
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/*
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* This IOCTL is meant to read back to the user the base address and length of
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* the memory-region specified to the driver for use with mmap.
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*/
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#define ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG \
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_IOWR(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \
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0x01, struct aspeed_p2a_ctrl_mapping)
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#endif /* _LINUX_ASPEED_P2A_CTRL_H */
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