/* 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. */ #ifndef _LINUX_ASPEED_P2A_CTRL_H #define _LINUX_ASPEED_P2A_CTRL_H #include <linux/ioctl.h> #include <linux/types.h> #define ASPEED_P2A_CTRL_READ_ONLY 0 #define ASPEED_P2A_CTRL_READWRITE 1 /* * 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) #endif /* _LINUX_ASPEED_P2A_CTRL_H */