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